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WO2003032357A1 - Plasma display panel with coplanar electrodes having inclined discharge edges - Google Patents

Plasma display panel with coplanar electrodes having inclined discharge edges Download PDF

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Publication number
WO2003032357A1
WO2003032357A1 PCT/FR2002/003442 FR0203442W WO03032357A1 WO 2003032357 A1 WO2003032357 A1 WO 2003032357A1 FR 0203442 W FR0203442 W FR 0203442W WO 03032357 A1 WO03032357 A1 WO 03032357A1
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WO
WIPO (PCT)
Prior art keywords
cell
electrodes
panel according
coplanar
edges
Prior art date
Application number
PCT/FR2002/003442
Other languages
French (fr)
Inventor
Laurent Tessier
Original Assignee
Thomson Licensing S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing S.A. filed Critical Thomson Licensing S.A.
Priority to EP02783237A priority Critical patent/EP1436824A1/en
Priority to KR1020047005092A priority patent/KR100910896B1/en
Publication of WO2003032357A1 publication Critical patent/WO2003032357A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/22—Electrodes, e.g. special shape, material or configuration
    • H01J11/24—Sustain electrodes or scan electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/22—Electrodes, e.g. special shape, material or configuration
    • H01J11/32—Disposition of the electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/24—Sustain electrodes or scan electrodes
    • H01J2211/245—Shape, e.g. cross section or pattern
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/32—Disposition of the electrodes
    • H01J2211/323—Mutual disposition of electrodes

Definitions

  • the invention relates to a plasma display panel comprising a first panel 1 and a second panel
  • the first plate 1 comprising at least two arrays of electrodes Y, Y 'for priming and the supply of so-called coplanar maintenance discharges, oriented in parallel general directions, entangled so that each cell 4 is crossed by an electrode of each network, the adjacent coplanar electrodes of different networks Y1, Y'1 having , at the level of each cell 4R, 4G, 4B, edges 6, 6 'which face each other, which have a symmetry with respect to a central point of said cell, and which are separated by a constant distance 12 over a predetermined length , which is called boot edges.
  • the set of cells supplied by the same coplanar electrode forms a line of cells; generally, the second slab 2 comprises a network of X electrodes called addressing, oriented perpendicular to the general direction of the coplanar electrodes; for example, the adjacent cells 4R, 4G, 4B are addressed by the electrodes X-m, XIG, XIB; all the cells supplied by the same addressing electrode form a column of cells.
  • addressing oriented perpendicular to the general direction of the coplanar electrodes
  • the panel further comprises a network of barriers interposed between the slabs; this network comprises at least barriers 5 extending over the entire panel between each addressing electrode, in a general direction perpendicular to that of the coplanar electrodes; in this way, the dimensions of each cell measured in the general direction of the coplanar electrodes are limited by barriers 5 of this network; these barriers are generally used to support the slabs 1, 2.
  • the barriers are not shown in Figure 2.
  • the network of barriers of certain panels of the prior art also includes barriers extending over the entire panel in a general direction parallel to that of the coplanar electrodes, so that each cell is delimited on its entire periphery by barriers, as shown in Figure 3.
  • the cells have a rectangular shape; therefore, for each cell, all the dimensions evaluated in the general horizontal direction of the coplanar electrodes are equal and correspond, in the figure, to the smallest side of the rectangle; the cells of this panel are distributed in a two-dimensional matrix, unlike the cells of a plasma panel for the addressing of a liquid crystal display panel ("Plasma Addressed Liquid Crystal" or PALC in English); in fact, in these plasma addressing panels, the matrix of cells is one-dimensional.
  • the panel shown in Figure 4 is described in document US 5825128 (FUJI); the cells of this panel are hexagon shaped and are staggered; for each cell, all the dimensions evaluated in the general horizontal direction of the coplanar electrodes are not equal; in fact, because of the hexagonal shape, a horizontal dimension 14 is measured which is greater in the center than at the top or at the bottom of the cells; the opposite barriers which delimit the cells along the greatest horizontal dimension 14, that is to say at the center of the cells, form rectilinear sides of the cells, in this case, the vertical sides of the hexagons.
  • the piloting of the plasma panels conventionally includes addressing periods intended to activate the cells which must be switched on, followed by holding periods during which alternating holding pulses are applied between the holding electrodes Y1, Y'1 serving a succession or cell line; the height of these pulses must have a sufficient voltage to cause discharges in the cells previously activated in the line, but insufficient to cause discharges in the cells of this line not previously activated.
  • the invention relates to all plasma display panels having a coplanar structure, that is to say whose maintenance discharges take place, in each cell, between two electrodes arranged on the same panel tile, which is usually the front panel.
  • the invention relates only to panels of this type where the constant distance, or "gap", which separates the edges of coplanar electrodes within each cell, is greater than or equal to the minimum distance corresponding to the discharge initiation conditions. say of Paschen; in conventional plasma panels, this distance would be of the order of 50 ⁇ m; the invention therefore does not relate to so-called “cathode glow discharges” in English, where the inter-electrode gap is much smaller, namely in practice less than 50 ⁇ m.
  • the classic Paschen breakdown condition defines, for a given pressure of discharge gas, a minimum distance between the edges of electrodes for which a discharge can start between these electrodes. so as to obtain at least the minimum constitution of a discharge, namely the dark space of aston with negative glow; if the distance between the electrodes is increased beyond this minimum, the rest of the discharge, namely in particular the positive column, can be formed. If, on the contrary, this distance is reduced, the negative glow disappears and the discharge is extinguished.
  • the addressing is generally carried out between an electrode of the addressing network X located on the other slab 2 of the panel and an electrode of the network Y also serving for holding.
  • the electrode networks of the slabs, at least the first slab 1, are generally covered with a dielectric layer 7 and with a protective layer 8, generally very thin based on MgO.
  • Each cell is generally provided with a layer 9R, 9G, 9B of phosphors capable of emitting visible radiation, in particular red, green or blue, when they are excited by the ultraviolet radiation of the discharges; these layers are generally deposited on the second slab 2 and on the slopes of the barriers 5 (see Figure 1); in the adjacent cells which are supplied by the same line of holding electrodes Y1, Y'1, there are generally phosphors of different colors; a set of three adjacent cells of different colors forms a pixel P, that is to say an element of the image to be displayed.
  • the discharges start in the cells activated at the edges 6, 6 'of the electrodes Y1, Y'1 which face each other, then extend on the dielectric layer 7 between these edges, then spread on either side of the edges; this spreading is carried out from the edges over the entire width of the electrodes; this spreading makes it possible to increase the volume of the pseudo-positive column of plasma, which is a zone of the reputed discharge with high luminous efficiency; this spreading therefore makes it possible to improve the light output and to obtain a more homogeneous distribution of the flux of ultraviolet radiation on the layers of phosphors; however, despite this spread, the light output of the plasma panels is still relatively low.
  • the tendency to increase the resolution of the displayed images leads to a higher density of cells of consequently reduced size; the reduced size of the cells leads to a reduction in the length of the edges 6, 6 'of discharge in each cell and limits the exchange surface between two adjacent electrodes Y1, Y'1 at the time of initiation of the discharges, with, for consequently, a limitation of the addressing speeds and of the holding frequency.
  • the reduced size of a cell also brings together the opposite barriers which delimit it; however, the proximity of the barriers causes a more precise location of the initiation of the discharges at a given fixed point P, P 'of the edge 6, 6' of the electrodes Y1, Y'1; in fact, discharges tend to avoid the proximity of the barriers because, if a start of ionization and discharge occurs near a barrier, the losses of the ionized species on the surface of this barrier would lead to the stopping of discharge ; in each cell, there is therefore, in the vicinity of each barrier, a zone of width d b in which the discharges are unlikely to occur; the width d of this zone is generally between 20 to 60 ⁇ m; it depends on the depth of the cell (or distance between the slabs), the frequency of the voltage pulses, and still other parameters; as soon as the opposite barriers are brought closer by a distance less than or equal to approximately 2 xd b , the priming of the discharges is located more and more at a fixed point of the priming edge
  • the length of the priming edges 6, 6 ′ for discharging each cell is equal to the largest of the dimensions of this cell 14 measured in the general horizontal direction of the coplanar electrodes between two barriers opposite, either the width of the rectangle ( Figure 2) or the hexagon ( Figure 4); for the cell 4G in FIG. 4, the length of the edges 6, 6 ′ for priming the electrodes Y1, Y′1 corresponds to the segments AB and A′B ′.
  • each coplanar electrode Y1, Y'1 comprises:
  • the bus 10, 10 ' being positioned behind the priming edge of this electrode, at least one branch 11a, 11' a extending from the bus 10, 10 'to the priming edge .
  • the edges of branches which face each other are separated by a constant distance 12 over a predetermined length which corresponds to the width of these branches, which is here variable from one cell to another: 21a and 23a for cell 4a - 21b and 23b for the next cell, then 21c and 23c, 21 d and 23d; the length of the discharge initiation edges is here always less than the width 14a, 14b, 14c, 14d of the rectangles forming the cells, which corresponds to the dimension of the cells measured between two opposite barriers arranged in the general direction of the coplanar electrodes.
  • the discharges start between the branches 11a and 11 'a, then extend over the entire length 20a, 22a of these branches, transversely to the buses 10, 10'; this spreading being favorable to the light output, it is advantageous to choose as long branches as possible.
  • the invention aims to increase the light output of plasma panels, to improve the addressing speed of cells, and to increase the lifetime of the panels.
  • the subject of the invention is a plasma display panel comprising a first panel and a second panel providing between them a space filled with discharge gas and compartmentalized in a two-dimensional matrix of discharge cells
  • the first panel comprising at least two networks of electrodes for the initiation and supply of so-called coplanar maintenance discharges, oriented in parallel general directions, entangled so that each cell is crossed by an electrode of each network, the dimensions of each cell extending in the general direction of these coplanar electrodes being limited by barriers extending in a general direction perpendicular to that of the coplanar electrodes, the adjacent coplanar electrodes of different networks having, at the level of each cell, edges that face each other and are separated by a constant distance over a predetermined length, characterized in that, for each cell, said length of the discharge initiation edges is greater, preferably at least 20%, than the greatest of said dimensions of the cell in the general direction of the coplanar electrodes .
  • said constant distance which separates the edges of electrodes within each cell is greater than or equal to the minimum distance corresponding to the so-called Paschen discharge initiation conditions; preferably, this constant distance or "gap" is greater than or equal to 50 ⁇ m; the panel according to the invention therefore does not relate to so-called “cathode glow discharge” panels in the English language.
  • the invention thus provides, for each cell, discharge initiation edges longer than in the prior art, which makes it possible to increase the surface area d exchange between the electrodes in the ignition zones of the discharges; However, the larger the area for which the so-called Townsend conditions are met, the more the probability of ignition is increased, which brings the following advantages:
  • the invention makes it possible to avoid or limit the fixing of the priming at fixed points of the edges, since the priming edges of the electrodes are longer; indeed, the discharge is then positioned a little more randomly than in the prior art; the wear of the protective layer based on MgO is thus limited and the lifetime of the panels is extended.
  • the edges which face the adjacent coplanar electrodes have a symmetry with respect to a central point of said cell; this characteristic of symmetry implies that, in the alternative holding phase, the operation is identical whatever the polarity of the coplanar electrodes of each pair; if, during a first alternation of maintenance and in a given cell, a maintenance electrode plays the role of cathode and the other maintenance electrode plays the role of anode, during the following alternation, the situation is reversed : the old cathode becomes anode and the old anode becomes cathode; symmetry of the electrode edges with respect to a central point of the cell advantageously provides identical operation and characteristics in these two half-cycles, in particular at the level of initiation of the discharges.
  • the cells are in the shape of a rectangle, two sides of which are parallel to the general direction of the coplanar electrodes and said length of the discharge initiating edges is greater than that of said sides.
  • the discharge paths reorganized by the shape of the priming edges of the coplanar electrodes then also induce the lengthening of the discharge spread paths, for example along the diagonal of the rectangles; this extension of the spreading paths results in a significant improvement in the light output.
  • the invention also relates to a panel according to the invention where, for each cell, said discharge initiation edges have a rectilinear portion inclined relative to the general direction of the coplanar electrodes.
  • the priming edges may also have rectilinear portions which are not inclined, in particular in the vicinity of the barriers; a single rectilinear inclined portion per cell is preferable, since several rectilinear inclined portions with different inclination angles, notably opposite ones, would lead to the instability of the discharges, in particular if the symmetry with respect to a central point of the cell is not not respected; similarly, an inclined straight portion is preferable to a curved portion, which also leads to the instability of the discharges.
  • this inclined rectilinear portion is positioned approximately equidistant from said two opposite barriers.
  • the angle of inclination of said straight portion relative to the general direction of the coplanar electrodes is, in absolute value, between 30 ° and 60 °.
  • said angle of inclination is positive for one and negative for the other.
  • the cells of the panel are staggered; in particular in the case where the priming edges have a rectilinear inclined portion, such an arrangement in fact makes it possible to prevent this inclination leading to too rapid bringing together of the discharges towards the barriers.
  • each coplanar electrode comprises:
  • said bus being positioned behind the discharge initiating edge of said electrode, at least one bypass extending from said bus to said initiating edge.
  • the first slab forms the front face of said panel and said second slab forms the rear face; then, preferably:
  • each derivation includes opaque bars forming a grid.
  • each branch is made of transparent conductive material and, optionally, the succession of branches along each coplanar electrode forms a continuous strip along said bus.
  • the invention may also have one or more of the following characteristics: - the electrode arrays of the first slab are covered with a dielectric layer;
  • the second panel comprises a network of so-called data electrodes crossing the coplanar electrodes at the level of each cell;
  • the second slab and the walls of the barriers are, at least partially, covered with phosphors.
  • FIGS. 6 to 12 represent schematic views from above of plasma display panels according to different embodiments of the invention in the case where the cells are rectangular: o panel with priming edges inclined over the entire width of the cells: FIG. 6 relates to the case where the cells are arranged in a matrix, FIG. 7 relates to the case where the cells are arranged in staggered rows; o panel with priming edges inclined only over a central portion of the width of the cells: FIGS. 8 to 10, FIGS. 9 and 12 differing in that the coplanar electrodes are not solid but are in the form of grids, and FIG. 10 differentiating in that adjacent cells of different colors have different electrodes, the priming edges of which have in particular different inclinations.
  • FIG. 11 is a variant of Figure 6, where the transparent branches form continuous strips which are not connected to the buses continuously over their entire length.
  • the display panel according to a first embodiment of the invention is comparable to the panel previously described with reference to Figures 1 to 3; emphasis will therefore be placed in the following description only on the differences with the panels of the prior art; for the common elements, reference will therefore be made to the panel previously described; all the panels described later have a dielectric layer covering the coplanar electrodes; the panel according to the invention comprises rectangular cells 4R, 4G, 4B arranged in two-dimensional matrix and coplanar electrodes Y1, Y'1 passing through the panel in a generally horizontal direction.
  • Each cell is here delimited on its entire periphery by rectilinear barriers 5, 5 '; the vertical barriers 5 limit the size of the cells in their width 14, which is a dimension oriented in the direction of the coplanar electrodes; the barriers 5 'are horizontal.
  • the coplanar electrodes Y1, Y'1 include:
  • the two coplanar electrodes are symmetrical with each other with respect to a central point C, in particular at their facing edges; as already indicated, this characteristic facilitates and improves the operation of the panel.
  • the branches 11, 11 'of the adjacent coplanar electrodes Y1, Y'1 crossing the same cells 4R, 4G, 4B have edges 6, 6' which face each other and which are separated by a distance 12 which is constant over their entire length ; at the level of each cell, these edges are here rectilinear over the entire width of the cell and are inclined by an angle whose absolute value is greater than 30 ° relative to the horizontal; for two adjacent cells, the angle of inclination is alternately positive and negative.
  • the length 15 of the discharge initiating edges is greater than the width 14 of the rectangle delimiting this cell between two barriers 5 'perpendicular to the buses.
  • the invention thus provides, for each cell, discharge initiation edges longer than in the prior art, which makes it possible to increase the speed d addressing of the panel, lengthen its lifespan and improve the light output.
  • the panel according to the invention which has just been described is manufactured by manufacturing methods known in themselves which will not be described here. in detail ; use is made in particular of conventional methods of manufacturing transparent electrodes in order to obtain the inclined shape of the edges characteristic of the embodiment of the invention.
  • Figure 11 shows a variant of Figure 6, where the strip continues
  • the invention is particularly applicable to panels whose cells, always rectangular, even square, are staggered, as shown in Figure 7; as before, the edges of the electrodes Y1, Y'1, more precisely those of the branches 11, 11 'of these electrodes, are inclined over the entire width of the cells so that the length of these edges is, at each cell, greater than the width of the cells, that is to say the size of the cells which extends in the same general direction as those of the electrodes Y1, Y'1.
  • the edges of the electrodes Y1, Y'1 are only inclined at the center of the cells; at the level of each cell, these edges then comprise an inclined part 61, 61 ', and, on both sides, a non-inclined part, 62 and 62' on one side, and 63 and 63 'on the other side; this makes it easier to initiate discharges far from the barriers and to limit the electrical losses at the surface of the barriers; according to the invention, the total length of each discharge initiating edge 15 is the sum of the length of the non-inclined part 62, 62 'on the first side, that of the inclined part 61, 61' and that from the non-inclined part 63, 63 'on the other side; this sum is greater than the dimension 14 of the cell measured in the general direction of the coplanar electrodes Y1, Y'1; preferably, the inclined rectilinear portion represents less than 80% but more than 50% of the total length of
  • the branches of the coplanar electrodes Y1, Y'1 are formed by bars 13, 13 'having a shape adapted so that the edges of different electrodes Y1, Y'1 which face each other have an inclined portion 61, 61 'in each cell; here, the bars are no longer in contact with the bus over their entire length.
  • FIG. 8 represented in FIG. 9, which has the same staggered structure and the same forms of gaps.
  • the branches of the coplanar electrodes Y1, Y'1 also comprise transverse conductors 19 which make it possible to orient advantageously the expansion of the discharges above the dielectric layer covering the electrodes; better light yields are then obtained.
  • the branches 11, 11 'no longer form a continuous transparent conductive strip passing through the entire slab as in FIG. 6, but are individualized 11a, 11'a, .. ., 11c, 11'c per cells a, b, c, as in Figure 5 of the prior art; as in FIG.
  • the width of the branches is variable from one cell to another: 23a for cell 4a, 23b for cell 4b, 23c for cell 4c; according to the invention, each branch 11a, 11 'a, ..., 11c, 11'c offers an inclined rectilinear discharge front 61, 61'; due to this inclination, at each branch 11a, 11 'a, ..., 11c, 11'c, the length of the discharge initiating edges is greater than the width of branch 23a, 23b, 23c; furthermore, according to the invention, in each cell, the length of the discharge initiation edges is greater than the width of this cell, measured between two opposite barriers: thus, for example, the length 15c of the initiation edges of cell 4c discharge is greater than the width 14c of this cell; in addition, the angle of inclination of these edges is variable from one cell to another, which advantageously makes it possible to adapt the priming conditions between different cells comprising, for example, phosphors of different colors.
  • the length of the priming edges of each branch is certainly greater than the width of this branch, but not necessarily to the width of the cell, in particular if the width of the branch is much less than that of the cell ; according to the invention, the inclination must be large enough so that the length of the priming edges is greater than the width of the cell.
  • the invention also applies to cases where the edges of coplanar electrodes which face each other have several rectilinear portions inclined in each cell, or have curved shapes, provided that, in each cell of the panel, the length of the edges of discharge initiation between the coplanar electrodes is greater, preferably at least 20%, than the largest of the dimensions of this cell measured in the general direction of the coplanar electrodes.
  • the invention applies to all forms of cells of coplanar panels.

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  • Plasma & Fusion (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
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Abstract

The invention concerns a panel comprising a first faceplate including at least two arrays of coplanar electrodes (Y1, Y'1) having, at each cell (4R, 4G, 4B), mutually facing edges (6, 6') separated by a constant distance (12) over a predetermined length (15) greater than the largest (14) of the dimensions of the cell in the general direction of the coplanar electrodes (Y1, Y'1); preferably, for each cell, said priming edges (6, 6') have an inclined rectilinear portion, thereby improving response time, performance and life span of the panel.

Description

PANNEAU DE VISUALISATION A PLASMA A ELECTRODES COPLANAIRES PRESENTANT DES BORDS DE DECHARGE INCLINES. PLASMA VISUALIZATION PANEL WITH COPLANAR ELECTRODES HAVING INCLINED DISCHARGE EDGES.
En référence aux figures 1 à 4, l'invention concerne un panneau de visualisation à plasma comprenant une première dalle 1 et une deuxième dalleReferring to Figures 1 to 4, the invention relates to a plasma display panel comprising a first panel 1 and a second panel
2 ménageant entre elles un espace 3 rempli de gaz de décharge et compartimenté en un ensemble bi-dimensionnel de cellules 4R, 4G, 4B de décharge, la première dalle 1 comprenant au moins deux réseaux d'électrodes Y, Y' pour l'amorçage et l'alimentation de décharges d'entretien dites coplanaires, orientées selon des directions générales parallèles, enchevêtrées de manière à ce que chaque cellule 4 soit traversée par une électrode de chaque réseau, les électrodes coplanaires adjacentes de différents réseaux Y1 , Y'1 présentant, au niveau de chaque cellule 4R, 4G, 4B, des bords 6, 6' qui se font face, qui présentent une symétrie par rapport à un point central de ladite cellule, et qui sont séparés par une distance constante 12 sur une longueur prédéterminée, qu'on appelle bords d'amorçage.2 providing between them a space 3 filled with discharge gas and compartmentalized into a two-dimensional assembly of discharge cells 4R, 4G, 4B, the first plate 1 comprising at least two arrays of electrodes Y, Y 'for priming and the supply of so-called coplanar maintenance discharges, oriented in parallel general directions, entangled so that each cell 4 is crossed by an electrode of each network, the adjacent coplanar electrodes of different networks Y1, Y'1 having , at the level of each cell 4R, 4G, 4B, edges 6, 6 'which face each other, which have a symmetry with respect to a central point of said cell, and which are separated by a constant distance 12 over a predetermined length , which is called boot edges.
L'ensemble des cellules alimentées par une même électrode coplanaire forme une ligne de cellules ; généralement, la deuxième dalle 2 comprend un réseau d'électrodes X dites d'adressage, orientées perpendiculairement à la direction générale des électrodes coplanaires ; par exemple, les cellules adjacentes 4R, 4G, 4B sont adressées par les électrodes X-m, XIG, XIB ; l'ensemble des cellules alimentées par la même électrode d'adressage forme une colonne de cellules. Le panneau comprend en outre un réseau de barrières intercalé entre les dalles ; ce réseau comprend au moins des barrières 5 s'étendant sur tout le panneau entre chaque électrode d'adressage, dans une direction générale perpendiculaire à celle des électrodes coplanaires ; de cette manière, les dimensions de chaque cellule mesurées dans la direction générale des électrodes coplanaires sont limitées par des barrières 5 de ce réseau ; ces barrières servent généralement à supporter les dalles 1 , 2.The set of cells supplied by the same coplanar electrode forms a line of cells; generally, the second slab 2 comprises a network of X electrodes called addressing, oriented perpendicular to the general direction of the coplanar electrodes; for example, the adjacent cells 4R, 4G, 4B are addressed by the electrodes X-m, XIG, XIB; all the cells supplied by the same addressing electrode form a column of cells. The panel further comprises a network of barriers interposed between the slabs; this network comprises at least barriers 5 extending over the entire panel between each addressing electrode, in a general direction perpendicular to that of the coplanar electrodes; in this way, the dimensions of each cell measured in the general direction of the coplanar electrodes are limited by barriers 5 of this network; these barriers are generally used to support the slabs 1, 2.
Les barrières ne sont pas représentées sur la figure 2. Le réseau de barrières de certains panneaux de l'art antérieur comprend également des barrières s'étendant sur tout le panneau dans une direction générale parallèle à celle des électrodes coplanaires, de sorte que chaque cellule est délimitée sur l'ensemble de son pourtour par des barrières, comme représenté à la figure 3.The barriers are not shown in Figure 2. The network of barriers of certain panels of the prior art also includes barriers extending over the entire panel in a general direction parallel to that of the coplanar electrodes, so that each cell is delimited on its entire periphery by barriers, as shown in Figure 3.
Dans le panneau représenté à la figure 2, les cellules ont une forme rectangulaire ; de ce fait, pour chaque cellule, toutes les dimensions évaluées dans la direction générale horizontale des électrodes coplanaires sont égales et correspondent, sur la figure, au plus petit côté du rectangle ; les cellules de ce panneau sont réparties en une matrice bi-dimensionnelle, contrairement aux cellules d'un panneau à plasma pour l'adressage d'un panneau de visualisation à cristaux liquides (« Plasma Addressed Liquid Crystal » ou PALC en langue anglaise) ; en effet, dans ces panneaux d'adressage à plasma, la matrice des cellules est monodimensionnelle.In the panel shown in Figure 2, the cells have a rectangular shape; therefore, for each cell, all the dimensions evaluated in the general horizontal direction of the coplanar electrodes are equal and correspond, in the figure, to the smallest side of the rectangle; the cells of this panel are distributed in a two-dimensional matrix, unlike the cells of a plasma panel for the addressing of a liquid crystal display panel ("Plasma Addressed Liquid Crystal" or PALC in English); in fact, in these plasma addressing panels, the matrix of cells is one-dimensional.
Le panneau représenté à la figure 4 est décrit dans le document US 5825128 (FUJI) ; les cellules de ce panneau sont en forme d'hexagones et sont réparties en quinconce ; pour chaque cellule, toutes les dimensions évaluées dans la direction générale horizontale des électrodes coplanaires ne sont pas égales ; en effet, du fait de la forme hexagonale, on mesure une dimension horizontale 14 plus importante au centre que dans le haut ou dans le bas des cellules ; les barrières opposées qui délimitent les cellules le long de la plus grande dimension horizontale 14, c'est à dire au centre des cellules, forment des côtés rectilignes des cellules, en l'occurrence, les côtés verticaux des hexagones.The panel shown in Figure 4 is described in document US 5825128 (FUJI); the cells of this panel are hexagon shaped and are staggered; for each cell, all the dimensions evaluated in the general horizontal direction of the coplanar electrodes are not equal; in fact, because of the hexagonal shape, a horizontal dimension 14 is measured which is greater in the center than at the top or at the bottom of the cells; the opposite barriers which delimit the cells along the greatest horizontal dimension 14, that is to say at the center of the cells, form rectilinear sides of the cells, in this case, the vertical sides of the hexagons.
Le pilotage des panneaux à plasma comprend classiquement des périodes d'adressage destinées à activer les cellules qui doivent être allumées, suivies de périodes de maintien pendant lesquelles on applique des impulsions alternatives de maintien entre les électrodes de maintien Y1 , Y'1 desservant une succession ou ligne de cellules ; la hauteur de ces impulsions doit présenter une tension suffisante pour provoquer des décharges dans les cellules préalablement activées de la ligne, mais insuffisante pour provoquer des décharges dans les cellules de cette ligne non préalablement activées.The piloting of the plasma panels conventionally includes addressing periods intended to activate the cells which must be switched on, followed by holding periods during which alternating holding pulses are applied between the holding electrodes Y1, Y'1 serving a succession or cell line; the height of these pulses must have a sufficient voltage to cause discharges in the cells previously activated in the line, but insufficient to cause discharges in the cells of this line not previously activated.
A la réserve suivante près concernant le type de décharge, l'invention concerne tous les panneaux de visualisation à plasma présentant une structure coplanaire, c'est à dire dont les décharges d'entretien s'effectuent, dans chaque cellule, entre deux électrodes disposées sur la même dalle du panneau, qui est généralement la dalle avant.With the following reservation concerning the type of discharge, the invention relates to all plasma display panels having a coplanar structure, that is to say whose maintenance discharges take place, in each cell, between two electrodes arranged on the same panel tile, which is usually the front panel.
L'invention concerne uniquement les panneaux de ce type où la distance constante, ou « gap », qui sépare les bords d'électrodes coplanaires au sein de chaque cellule, est supérieure ou égale à la distance minimum correspondant aux conditions d'amorçage de décharge dites de Paschen ; dans les panneaux à plasma classiques, cette distance serait de l'ordre de 50 μm ; l'invention ne concerne donc pas les panneaux dits à « cathode glow discharges » en langue anglaise, où le gap inter-électrodes est beaucoup plus faible, à savoir en pratique inférieur à 50 μm.The invention relates only to panels of this type where the constant distance, or "gap", which separates the edges of coplanar electrodes within each cell, is greater than or equal to the minimum distance corresponding to the discharge initiation conditions. say of Paschen; in conventional plasma panels, this distance would be of the order of 50 μm; the invention therefore does not relate to so-called “cathode glow discharges” in English, where the inter-electrode gap is much smaller, namely in practice less than 50 μm.
Pour différencier ces deux types de panneaux, rappelions qu'une décharge luminescente classique dite, en langue anglaise « négative glow discharge », présente les zones successives suivantes, de la cathode vers l'anode,:To differentiate these two types of panels, remember that a classic glow discharge known as “negative glow discharge” in English has the following successive zones, from the cathode to the anode:
- Cathode (électrode),- Cathode (electrode),
- Espace sombre d'aston,- Dark space of aston,
- Lueur cathodique (« cathode glow » en langue anglaise),- Cathode glow (“cathode glow” in English),
- Espace sombre de Crookes, - Lueur négative (« négative glow » en langue anglaise)- Crookes dark space, - Negative glow (“negative glow” in English)
- Espace sombre de Faraday- Faraday's dark space
- Colonne positive- Positive column
- Lueur anodique- Anodic glow
- Espace sombre anodique - Anode (électrode).- Dark anodic space - Anode (electrode).
La condition classique de claquage de Paschen définit, pour une pression donnée de gaz de décharge, une distance minimum entre les bords d'électrodes pour laquelle une décharge peut s'amorcer entre ces électrodes de manière à obtenir au moins la constitution minimale d'une décharge, à savoir l'espace sombre d'aston à lueur négative ; si on augmente la distance entre les électrodes au delà de ce minimum, le reste de la décharge, à savoir notamment la colonne positive, peut se constituer. Si, à l'inverse, on diminue cette distance, la lueur négative disparaît et la décharge s'éteint.The classic Paschen breakdown condition defines, for a given pressure of discharge gas, a minimum distance between the edges of electrodes for which a discharge can start between these electrodes. so as to obtain at least the minimum constitution of a discharge, namely the dark space of aston with negative glow; if the distance between the electrodes is increased beyond this minimum, the rest of the discharge, namely in particular the positive column, can be formed. If, on the contrary, this distance is reduced, the negative glow disappears and the discharge is extinguished.
Il existe cependant un régime dit de "cathode glow discharge" en langue anglaise, qui, pour une distance très inférieure à la distance minimum de Paschen pour une pression donnée, permet, en augmentant fortement la tension entre les électrodes, d'obtenir une décharge dans laquelle la lueur négative n'existe pas ; les documents EP 1065695 et EP 0996138 décrivent des panneaux à plasma de ce type ; à noter également que les bords des électrodes décrites dans ces documents ne présentent pas, au sein de chaque cellule, une symétrie par rapport à un point central de cette cellule.There is however a regime called "cathode glow discharge" in English, which, for a distance much less than the minimum Paschen distance for a given pressure, allows, by greatly increasing the voltage between the electrodes, to obtain a discharge in which the negative glow does not exist; documents EP 1065695 and EP 0996138 describe plasma panels of this type; also note that the edges of the electrodes described in these documents do not have, within each cell, a symmetry with respect to a central point of this cell.
Dans les panneaux coplanaires précités, l'adressage s'effectue généralement entre une électrode du réseau d'adressage X situé sur l'autre dalle 2 du panneau et une électrode du réseau Y servant aussi au maintien. Les réseaux d'électrodes des dalles, au moins la première dalle 1 , sont généralement recouverts d'une couche diélectrique 7 et d'une couche de protection 8, généralement très mince à base de MgO.In the aforementioned coplanar panels, the addressing is generally carried out between an electrode of the addressing network X located on the other slab 2 of the panel and an electrode of the network Y also serving for holding. The electrode networks of the slabs, at least the first slab 1, are generally covered with a dielectric layer 7 and with a protective layer 8, generally very thin based on MgO.
Chaque cellule est généralement dotée d'une couche 9R, 9G, 9B de luminophores susceptibles d'émettre un rayonnement visible, notamment rouge, vert ou bleu, lorsqu'ils sont excités par le rayonnement ultra-violet des décharges ; ces couches sont généralement déposées sur la deuxième dalle 2 et sur les versants des barrières 5 (voir figure 1) ; dans les cellules adjacentes qui sont alimentées par la même ligne d'électrodes Y1 , Y'1 de maintien, on trouve généralement des luminophores de couleurs différentes ; un ensemble de trois cellules adjacentes de couleurs différentes forme un pixel P, c'est à dire un élément de l'image à visualiser.Each cell is generally provided with a layer 9R, 9G, 9B of phosphors capable of emitting visible radiation, in particular red, green or blue, when they are excited by the ultraviolet radiation of the discharges; these layers are generally deposited on the second slab 2 and on the slopes of the barriers 5 (see Figure 1); in the adjacent cells which are supplied by the same line of holding electrodes Y1, Y'1, there are generally phosphors of different colors; a set of three adjacent cells of different colors forms a pixel P, that is to say an element of the image to be displayed.
Dans les phases de maintien, les décharges s'amorcent dans les cellules activées au niveau des bords 6, 6' des électrodes Y1 , Y'1 qui se font face, s'étendent alors sur la couche diélectrique 7 entre ces bords, puis s'étalent de part et d'autre des bords ; cet étalement s'effectue à partir des bords sur toute la largeur des électrodes ; cet étalement permet d'augmenter le volume de la pseudo colonne positive de plasma, qui est une zone de la décharge réputée à fort rendement lumineux ; cet étalement permet donc d'améliorer le rendement lumineux et d'obtenir une distribution plus homogène du flux de rayonnement ultraviolet sur les couches de luminophores ; cependant, malgré cet étalement, le rendement lumineux des panneaux à plasma reste encore relativement faible.In the maintenance phases, the discharges start in the cells activated at the edges 6, 6 'of the electrodes Y1, Y'1 which face each other, then extend on the dielectric layer 7 between these edges, then spread on either side of the edges; this spreading is carried out from the edges over the entire width of the electrodes; this spreading makes it possible to increase the volume of the pseudo-positive column of plasma, which is a zone of the reputed discharge with high luminous efficiency; this spreading therefore makes it possible to improve the light output and to obtain a more homogeneous distribution of the flux of ultraviolet radiation on the layers of phosphors; however, despite this spread, the light output of the plasma panels is still relatively low.
Par ailleurs, dans le développement de panneaux à plasma, la tendance à l'augmentation de la résolution des images visualisées conduit à une densité plus importante de cellules de taille par conséquent réduite ; la taille réduite des cellules entraîne la diminution de la longueur des bords 6, 6' de décharge dans chaque cellule et limite la surface d'échange entre deux électrodes adjacentes Y1 , Y'1 au moment de l'amorçage des décharges, avec, pour conséquence, une limitation des vitesses d'adressages et de la fréquence de maintien.Furthermore, in the development of plasma panels, the tendency to increase the resolution of the displayed images leads to a higher density of cells of consequently reduced size; the reduced size of the cells leads to a reduction in the length of the edges 6, 6 'of discharge in each cell and limits the exchange surface between two adjacent electrodes Y1, Y'1 at the time of initiation of the discharges, with, for consequently, a limitation of the addressing speeds and of the holding frequency.
La taille réduite d'une cellule entraîne aussi le rapprochement des barrières opposées qui la délimitent ; or, la proximité des barrières provoque une localisation plus précise de l'amorçage des décharges en un point donné fixe P, P' du bord 6, 6' des électrodes Y1 , Y'1 ; en effet, les décharges ont tendance à éviter la proximité des barrières car, si un début d'ionisation et de décharge se produisait à proximité d'une barrière, les pertes des espèces ionisées à la surface de cette barrière conduirait à l'arrêt de la décharge ; dans chaque cellule, il existe donc, au voisinage de chaque barrière, une zone de largeur db dans laquelle les décharges ont peu de chances de se produire ; la largeur d de cette zone est généralement comprise entre 20 à 60 μm ; elle dépend de la profondeur de la cellule (ou distance entre les dalles), de la fréquence des impulsions de tension, et encore d'autres paramètres ; dès que les barrières opposées sont rapprochées d'une distance inférieure ou égale à environ 2 x db, l'amorçage des décharges se localise de plus en plus en un point fixe du bord d'amorçage, provoque en ce point une dégradation rapide de la couche de protection 8 à base de MgO, oblige à augmenter la tension pour provoquer la décharge en un autre point du bord d'amorçage, et limite la durée de vie des panneaux.The reduced size of a cell also brings together the opposite barriers which delimit it; however, the proximity of the barriers causes a more precise location of the initiation of the discharges at a given fixed point P, P 'of the edge 6, 6' of the electrodes Y1, Y'1; in fact, discharges tend to avoid the proximity of the barriers because, if a start of ionization and discharge occurs near a barrier, the losses of the ionized species on the surface of this barrier would lead to the stopping of discharge ; in each cell, there is therefore, in the vicinity of each barrier, a zone of width d b in which the discharges are unlikely to occur; the width d of this zone is generally between 20 to 60 μm; it depends on the depth of the cell (or distance between the slabs), the frequency of the voltage pulses, and still other parameters; as soon as the opposite barriers are brought closer by a distance less than or equal to approximately 2 xd b , the priming of the discharges is located more and more at a fixed point of the priming edge, causes at this point a rapid degradation of the protective layer 8 based on MgO, requires increasing the voltage to cause the discharge at another point on the priming edge, and limits the service life of the panels.
Dans les panneaux représentés aux figures 2 et 4, la longueur des bords d'amorçage 6, 6' de décharge de chaque cellule est égale à la plus grande des dimensions de cette cellule 14 mesurée dans la direction générale horizontale des électrodes coplanaires entre deux barrières opposées, soit la largeur du rectangle (figure 2) ou de l'hexagone (figure 4) ; pour la cellule 4G de la figure 4, la longueur des bords 6, 6' d'amorçage des électrodes Y1 , Y'1 correspond aux segments AB et A'B'.In the panels shown in FIGS. 2 and 4, the length of the priming edges 6, 6 ′ for discharging each cell is equal to the largest of the dimensions of this cell 14 measured in the general horizontal direction of the coplanar electrodes between two barriers opposite, either the width of the rectangle (Figure 2) or the hexagon (Figure 4); for the cell 4G in FIG. 4, the length of the edges 6, 6 ′ for priming the electrodes Y1, Y′1 corresponds to the segments AB and A′B ′.
Dans le panneau à cellules rectangulaires schématisé à la figure 5, la longueur des bords d'amorçage de décharge de chaque cellule 4a, 4b, 4c, 4d (seul 4a a été reporté) est au contraire inférieure à la plus grande des dimensions 14a, 14b, 14c, 14d (seul 14c a été reporté) de cette cellule, mesurée dans la direction générale horizontale des électrodes coplanaires entre deux barrières opposées ; sur cette figure, chaque électrode coplanaire Y1 , Y'1 comprend :In the rectangular cell panel shown diagrammatically in FIG. 5, the length of the discharge initiation edges of each cell 4a, 4b, 4c, 4d (only 4a has been reported) is on the contrary less than the largest of the dimensions 14a, 14b, 14c, 14d (only 14c has been reported) of this cell, measured in the general horizontal direction of the coplanar electrodes between two opposite barriers; in this figure, each coplanar electrode Y1, Y'1 comprises:
- un bus opaque 10, 10' de distribution du courant de décharge traversant l'ensemble de la dalle, et, - au niveau de chaque cellule 4a, 4b, 4c, 4d alimentée par cette électrode- an opaque bus 10, 10 ′ for distributing the discharge current passing through the entire slab, and, - at the level of each cell 4a, 4b, 4c, 4d supplied by this electrode
Y1 , Y'1 , le bus 10, 10' étant positionné en arrière du bord d'amorçage de cette électrode, au moins une dérivation 11a, 11 'a s'étendant du bus 10, 10' jusqu'au bord d'amorçage.Y1, Y'1, the bus 10, 10 'being positioned behind the priming edge of this electrode, at least one branch 11a, 11' a extending from the bus 10, 10 'to the priming edge .
Dans chaque cellule de ce panneau, les bords de dérivations qui se font face sont séparés par une distance constante 12 sur une longueur prédéterminée qui correspond à la largeur de ces dérivations, qui est ici variable d'une cellule à l'autre : 21a et 23a pour la cellule 4a - 21b et 23b pour la cellule suivante, puis 21c et 23c, 21 d et 23d ; la longueur des bords d'amorçage de décharge est ici toujours inférieure à la largeur 14a, 14b, 14c, 14d des rectangles formant les cellules, qui correspond à la dimension des cellules mesurée entre deux barrières opposées disposées dans la direction générale des électrodes coplanaires. Comme précédemment décrit, dans chaque cellule 4a, les décharges s'amorcent entre les dérivations 11a et 11 'a, puis s'étendent sur toute la longueur 20a, 22a de ces dérivations, transversalement aux bus 10, 10' ; cet étalement étant favorable au rendement lumineux, on a intérêt à choisir des dérivations aussi longues que possible.In each cell of this panel, the edges of branches which face each other are separated by a constant distance 12 over a predetermined length which corresponds to the width of these branches, which is here variable from one cell to another: 21a and 23a for cell 4a - 21b and 23b for the next cell, then 21c and 23c, 21 d and 23d; the length of the discharge initiation edges is here always less than the width 14a, 14b, 14c, 14d of the rectangles forming the cells, which corresponds to the dimension of the cells measured between two opposite barriers arranged in the general direction of the coplanar electrodes. As previously described, in each cell 4a, the discharges start between the branches 11a and 11 'a, then extend over the entire length 20a, 22a of these branches, transversely to the buses 10, 10'; this spreading being favorable to the light output, it is advantageous to choose as long branches as possible.
Enfin, on connaît des panneaux de visualisation à plasma de structure coplanaire comprenant plus de deux réseaux enchevêtrés d'électrodes coplanaires, par exemple trois réseaux ; chaque cellule du panneau est alors traversée par une triade d'électrodes coplanaires ; ces panneaux posent les mêmes problèmes précédemment décrits.Finally, there are known plasma display panels of coplanar structure comprising more than two entangled networks of coplanar electrodes, for example three networks; each cell of the panel is then crossed by a triad of coplanar electrodes; these panels pose the same problems previously described.
L'invention a pour but d'accroître le rendement lumineux des panneaux à plasma, d'améliorer la vitesse d'adressage des cellules, et d'augmenter la durée de vie des panneaux.The invention aims to increase the light output of plasma panels, to improve the addressing speed of cells, and to increase the lifetime of the panels.
A cet effet, l'invention a pour objet un panneau de visualisation à plasma comprenant une première dalle et une deuxième dalle ménageant entre elles un espace rempli de gaz de décharge et compartimenté en une matrice bi- dimensionnelle de cellules de décharge, la première dalle comprenant au moins deux réseaux d'électrodes pour l'amorçage et l'alimentation de décharges d'entretien dites coplanaires, orientées selon des directions générales parallèles, enchevêtrées de manière à ce que chaque cellule soit traversée par une électrode de chaque réseau, les dimensions de chaque cellule s'étendant dans la direction générale de ces électrodes coplanaires étant limitées par des barrières s'étendant dans une direction générale perpendiculaire à celle des électrodes coplanaires, les électrodes coplanaires adjacentes de différents réseaux présentant, au niveau de chaque cellule, des bords qui se font face et qui sont séparés par une distance constante sur une longueur prédéterminée, caractérisé en ce que, pour chaque cellule, ladite longueur des bords d'amorçage de décharge est supérieure, de préférence d'au moins 20%, à la plus grande desdites dimensions de la cellule dans la direction générale des électrodes coplanaires.To this end, the subject of the invention is a plasma display panel comprising a first panel and a second panel providing between them a space filled with discharge gas and compartmentalized in a two-dimensional matrix of discharge cells, the first panel comprising at least two networks of electrodes for the initiation and supply of so-called coplanar maintenance discharges, oriented in parallel general directions, entangled so that each cell is crossed by an electrode of each network, the dimensions of each cell extending in the general direction of these coplanar electrodes being limited by barriers extending in a general direction perpendicular to that of the coplanar electrodes, the adjacent coplanar electrodes of different networks having, at the level of each cell, edges that face each other and are separated by a constant distance over a predetermined length, characterized in that, for each cell, said length of the discharge initiation edges is greater, preferably at least 20%, than the greatest of said dimensions of the cell in the general direction of the coplanar electrodes .
De préférence, ladite distance constante qui sépare les bords d'électrodes au sein de chaque cellule est supérieure ou égale à la distance minimum correspondant aux conditions d'amorçage de décharge dites de Paschen ; de préférence, cette distance constante ou « gap » est supérieure ou égale à 50 μ m ; le panneau selon l'invention ne concerne donc pas les panneaux dits à « cathode glow discharge » en langue anglaise. Pour une géométrie donnée de forme et de répartition des cellules sur le panneau, l'invention apporte ainsi, pour chaque cellule, des bords d'amorçage de décharge plus longs que dans l'art antérieur, ce qui permet d'augmenter la surface d'échange entre les électrodes dans les zones d'allumage des décharges ; or, plus la surface pour laquelle les conditions dites de Townsend sont réunies est grande, plus on augmente la probabilité d'allumage, ce qui apporte les avantages suivants :Preferably, said constant distance which separates the edges of electrodes within each cell is greater than or equal to the minimum distance corresponding to the so-called Paschen discharge initiation conditions; preferably, this constant distance or "gap" is greater than or equal to 50 μ m; the panel according to the invention therefore does not relate to so-called “cathode glow discharge” panels in the English language. For a given geometry of shape and distribution of the cells on the panel, the invention thus provides, for each cell, discharge initiation edges longer than in the prior art, which makes it possible to increase the surface area d exchange between the electrodes in the ignition zones of the discharges; However, the larger the area for which the so-called Townsend conditions are met, the more the probability of ignition is increased, which brings the following advantages:
- diminution du temps de réponse à l'application d'une impulsion de tension d'allumage entre les électrodes, ce qui permet d'augmenter la vitesse d'adressage du panneau ou d'augmenter la fréquence des impulsions de maintien, c'est à dire la luminosité du panneau ;reduction of the response time to the application of an ignition voltage pulse between the electrodes, which makes it possible to increase the speed of addressing of the panel or to increase the frequency of the holding pulses; to say the brightness of the panel;
- ou, réduction de la tension d'allumage à appliquer entre les électrodes pour provoquer une décharge, ce qui permet d'améliorer le rendement du panneau et surtout, d'utiliser des composants moins chers ;- Or, reduction of the ignition voltage to be applied between the electrodes to cause a discharge, which improves the efficiency of the panel and above all, to use cheaper components;
Même si les barrières opposées délimitant chaque cellule sont proches l'une de l'autre, l'invention permet d'éviter ou de limiter la fixation de l'amorçage en des points fixes des bords, puisque les bords d'amorçage des électrodes sont plus longs ; en effet, la décharge se positionne alors de manière un peu plus aléatoire que dans l'art antérieur ; on limite ainsi l'usure de la couche de protection à base de MgO et on allonge la durée de vie des panneaux. De préférence, au niveau de chaque cellule, les bords qui se font face des électrodes coplanaires adjacentes présentent une symétrie par rapport à un point central de ladite cellule ; cette caractéristique de symétrie implique que, en phase de maintien alternatif, le fonctionnement est identique quelle que soit la polarité des électrodes coplanaires de chaque paire ; si, lors d'une première alternance de maintien et dans une cellule donnée, une électrode de maintien joue le rôle de cathode et l'autre électrode de maintien joue le rôle d'anode, lors de l'alternance suivante, la situation est inversée : l'ancienne cathode devient anode et l'ancienne anode devient cathode ; la symétrie des bords d'électrodes par rapport à un point central de la cellule apporte avantageusement un fonctionnement et des caractéristiques identiques dans ces deux alternances, notamment au niveau de l'amorçage des décharges.Even if the opposite barriers delimiting each cell are close to one another, the invention makes it possible to avoid or limit the fixing of the priming at fixed points of the edges, since the priming edges of the electrodes are longer; indeed, the discharge is then positioned a little more randomly than in the prior art; the wear of the protective layer based on MgO is thus limited and the lifetime of the panels is extended. Preferably, at the level of each cell, the edges which face the adjacent coplanar electrodes have a symmetry with respect to a central point of said cell; this characteristic of symmetry implies that, in the alternative holding phase, the operation is identical whatever the polarity of the coplanar electrodes of each pair; if, during a first alternation of maintenance and in a given cell, a maintenance electrode plays the role of cathode and the other maintenance electrode plays the role of anode, during the following alternation, the situation is reversed : the old cathode becomes anode and the old anode becomes cathode; symmetry of the electrode edges with respect to a central point of the cell advantageously provides identical operation and characteristics in these two half-cycles, in particular at the level of initiation of the discharges.
En l'absence de cette symétrie, on risquerait des tensions d'amorçage différentes selon la polarité des électrodes, ce qui pourrait perturber le pilotage du panneau ; on risquerait également des différences dans l'étalement des décharges selon la polarité des électrodes, ce qui pourrait nuire au rendement lumineux du panneau.In the absence of this symmetry, there would be a risk of different ignition voltages depending on the polarity of the electrodes, which could disturb the control of the panel; there would also be a risk of differences in the spreading of the discharges according to the polarity of the electrodes, which could adversely affect the light output of the panel.
De préférence :Preferably:
- les barrières opposées qui délimitent les cellules le long de ladite plus grande dimension forment des côtés rectilignes de ladite cellule, qui sont perpendiculaires à celle des électrodes coplanaires.- the opposite barriers which delimit the cells along said largest dimension form rectilinear sides of said cell, which are perpendicular to that of the coplanar electrodes.
- les cellules sont en forme de rectangle dont deux côtés sont parallèles à la direction générale des électrodes coplanaires et ladite longueur des bords d'amorçage de décharge est supérieure à celle desdits côté.- The cells are in the shape of a rectangle, two sides of which are parallel to the general direction of the coplanar electrodes and said length of the discharge initiating edges is greater than that of said sides.
Les chemins de décharge réorganisés par la forme des bords d'amorçage des électrodes coplanaires induisent alors également l'allongement des chemins d'étalement de décharges, par exemple selon la diagonale des rectangles ; cet allongement des chemins d'étalement entraîne une amélioration sensible du rendement lumineux.The discharge paths reorganized by the shape of the priming edges of the coplanar electrodes then also induce the lengthening of the discharge spread paths, for example along the diagonal of the rectangles; this extension of the spreading paths results in a significant improvement in the light output.
L'invention a également pour objet un panneau selon l'invention où, pour chaque cellule, lesdits bords d'amorçage de décharge présentent une portion rectiligne inclinée par rapport à la direction générale des électrodes coplanaires. Les bords d'amorçage peuvent également présenter des portions rectilignes non inclinées, notamment au voisinage des barrières ; une seule portion rectiligne inclinée par cellule est préférable, car plusieurs portions rectilignes inclinées avec des angles d'inclinaison différents, notamment opposés, conduiraient à l'instabilité des décharges, notamment si la symétrie par rapport à un point central de la cellule n'est pas respectée ; de la même façon, une portion rectiligne inclinée est préférable à une portion courbe, qui conduit également à l'instabilité des décharges. De préférence, cette portion rectiligne inclinée est positionnée approximativement à égale distance desdites deux barrières opposées.The invention also relates to a panel according to the invention where, for each cell, said discharge initiation edges have a rectilinear portion inclined relative to the general direction of the coplanar electrodes. The priming edges may also have rectilinear portions which are not inclined, in particular in the vicinity of the barriers; a single rectilinear inclined portion per cell is preferable, since several rectilinear inclined portions with different inclination angles, notably opposite ones, would lead to the instability of the discharges, in particular if the symmetry with respect to a central point of the cell is not not respected; similarly, an inclined straight portion is preferable to a curved portion, which also leads to the instability of the discharges. Preferably, this inclined rectilinear portion is positioned approximately equidistant from said two opposite barriers.
C'est en effet loin des barrières opposées qu'il s'agit en priorité d'allonger les bords d'amorçage de décharge et donc de positionner la portion rectiligne inclinée, puisque, de toutes façons, comme indiqué précédemment, les décharges ont peu de chances de s'amorcer durablement au voisinage des barrières à cause des pertes des espèces ionisées sur les parois des barrières.It is indeed far from the opposite barriers that the priority is to lengthen the discharge initiation edges and therefore to position the inclined rectilinear portion, since, in any case, as indicated above, the discharges have little chances of lasting initiation in the vicinity of the barriers due to the loss of ionized species on the walls of the barriers.
De préférence, l'angle d'inclinaison de la dite portion rectiligne par rapport à la direction générale des électrodes coplanaires est, en valeur absolue, compris entre 30° et 60°.Preferably, the angle of inclination of said straight portion relative to the general direction of the coplanar electrodes is, in absolute value, between 30 ° and 60 °.
Pour un panneau dont les cellules sont rectangulaires et présentent une largeur de 300 μm, si la largeur db de la zone sans décharge au voisinage des barrières est de 20 μm, il reste 260 μm de largeur « active » ; si la portion inclinée s'étend sur l'ensemble de cette largeur « active » et si son inclinaison est supérieure à 30°, la longueur de cette portion inclinée sera supérieure à 300 μm, c'est à dire supérieure à la largeur des cellules, conformément à l'invention.For a panel whose cells are rectangular and have a width of 300 μm, if the width d b of the zone without discharge in the vicinity of the barriers is 20 μm, there remains 260 μm of “active” width; if the inclined portion extends over the whole of this “active” width and if its inclination is greater than 30 °, the length of this inclined portion will be greater than 300 μm, that is to say greater than the width of the cells , in accordance with the invention.
A l'inverse, une inclinaison trop importante, notamment supérieure à 60°, peut provoquer des risques d'instabilité des décharges.Conversely, too great an inclination, in particular greater than 60 °, can cause risks of instability of the discharges.
Selon un mode privilégié de réalisation, pour deux cellules adjacentes coupées par les mêmes électrodes coplanaires, ledit angle d'inclinaison est positif pour l'une et négatif pour l'autre.According to a preferred embodiment, for two adjacent cells cut by the same coplanar electrodes, said angle of inclination is positive for one and negative for the other.
De préférence, les cellules du panneau sont disposées en quinconce ; notamment dans le cas où les bords d'amorçage présentent une portion rectiligne inclinée, une telle disposition permet en effet d'éviter que cette inclinaison ne conduise à un rapprochement trop rapide des décharges vers les barrières.Preferably, the cells of the panel are staggered; in particular in the case where the priming edges have a rectilinear inclined portion, such an arrangement in fact makes it possible to prevent this inclination leading to too rapid bringing together of the discharges towards the barriers.
Selon un mode de réalisation avantageux, chaque électrode coplanaire comprend :According to an advantageous embodiment, each coplanar electrode comprises:
- un bus opaque de distribution du courant de décharge traversant l'ensemble de ladite dalle, et,an opaque bus for distributing the discharge current passing through the whole of said slab, and,
- au niveau de chaque cellule alimentée par cette électrode, ledit bus étant positionné en arrière du bord d'amorçage de décharge de ladite électrode, au moins une dérivation s'étendant dudit bus jusqu'au dit bord d'amorçage. Dans ce cas, de préférence, la première dalle forme la face avant dudit panneau et ladite deuxième dalle forme la face arrière ; alors, de préférence :- At each cell supplied by this electrode, said bus being positioned behind the discharge initiating edge of said electrode, at least one bypass extending from said bus to said initiating edge. In this case, preferably, the first slab forms the front face of said panel and said second slab forms the rear face; then, preferably:
- soit, chaque dérivation comprend des barreaux opaques formant une grille. - soit, chaque dérivation est en matériau conducteur transparent et, optionnellement, la succession des dérivations le long de chaque électrode coplanaire forme une bande continue le long dudit bus.- Either, each derivation includes opaque bars forming a grid. - Either, each branch is made of transparent conductive material and, optionally, the succession of branches along each coplanar electrode forms a continuous strip along said bus.
L'invention peut également présenter une ou plusieurs des caractéristiques suivantes : - les réseaux d'électrodes de la première dalle sont couverts d'une couche diélectrique ;The invention may also have one or more of the following characteristics: - the electrode arrays of the first slab are covered with a dielectric layer;
- la deuxième dalle comprend un réseau d'électrodes dites de données croisant les électrodes coplanaires au niveau de chaque cellule ;the second panel comprises a network of so-called data electrodes crossing the coplanar electrodes at the level of each cell;
- la deuxième dalle et les parois des barrières sont, au moins partiellement, couvertes de luminophores.- the second slab and the walls of the barriers are, at least partially, covered with phosphors.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple non limitatif, et en référence aux figures annexées sur lesquelles : - Les figures 1 à 5, déjà décrites, concernent des panneaux de visualisation à plasma de l'art antérieur : vue en coupe d'une cellule pour la figure 1 , vue en perspective d'un groupe de cellules délimitées sur tout leur pourtour par des barrières pour la figure 2, vue de dessus d'un panneau dont les cellules sont rectangulaires et disposées en matrice pour la figure 3, vue de dessus d'un panneau dont les cellules sont hexagonales et disposées en quinconce pour la figure 4, et vue de dessus d'un groupe de cellules ayant des bords d'amorçage de décharge de différentes longueurs pour la figure 5 ;The invention will be better understood on reading the description which follows, given by way of nonlimiting example, and with reference to the appended figures in which: - Figures 1 to 5, already described, relate to display panels to plasma of the prior art: sectional view of a cell for FIG. 1, perspective view of a group of cells delimited all around their perimeter by barriers for FIG. 2, top view of a panel whose cells are rectangular and arranged in a matrix for FIG. 3, top view of a panel whose cells are hexagonal and staggered for FIG. 4, and top view of a group of cells having priming edges of discharge of different lengths for Figure 5;
- Les figures 6 à 12 représentent des vues schématiques de dessus de panneaux de visualisation à plasma selon différents modes de réalisation de l'invention dans le cas où les cellules sont rectangulaires : o panneau avec des bords d'amorçage inclinés sur toute la largeur des cellules : la figure 6 concerne le cas où les cellules sont disposées en matrice, la figure 7 concerne le cas où les cellules sont disposée en quinconce ; o panneau avec des bords d'amorçage inclinés seulement sur une portion centrale de la largeur des cellules : figures 8 à 10, les figures 9 et 12 se différenciant en ce que les électrodes coplanaires ne sont pas pleines mais sont en forme de grilles, et la figure 10 se différenciant en ce que des cellules adjacentes de différentes couleurs ont des électrodes différentes, dont les bords d'amorçage présentent notamment des inclinaisons différentes. o la figure 11 est une variante de la figure 6, où les dérivations transparentes forment des bandes continues qui ne sont pas reliées aux bus continûment sur toute leur longueur.FIGS. 6 to 12 represent schematic views from above of plasma display panels according to different embodiments of the invention in the case where the cells are rectangular: o panel with priming edges inclined over the entire width of the cells: FIG. 6 relates to the case where the cells are arranged in a matrix, FIG. 7 relates to the case where the cells are arranged in staggered rows; o panel with priming edges inclined only over a central portion of the width of the cells: FIGS. 8 to 10, FIGS. 9 and 12 differing in that the coplanar electrodes are not solid but are in the form of grids, and FIG. 10 differentiating in that adjacent cells of different colors have different electrodes, the priming edges of which have in particular different inclinations. o Figure 11 is a variant of Figure 6, where the transparent branches form continuous strips which are not connected to the buses continuously over their entire length.
Afin de simplifier la description et de faire apparaître les différences et avantages que présente l'invention par rapport à l'état antérieur de la technique, on utilise des références identiques pour les éléments qui assurent les mêmes fonctions.In order to simplify the description and reveal the differences and advantages which the invention presents compared to the prior art, identical references are used for the elements which perform the same functions.
En se référant à la figure 6, le panneau de visualisation selon un premier mode de réalisation de l'invention est comparable au panneau précédemment décrit en référence aux figures 1 à 3 ; on ne mettra donc l'accent dans la suite de la description que sur les différences avec les panneaux de l'art antérieur ; pour les éléments communs, on se référera donc au panneau précédemment décrit ; tous les panneaux décrits ultérieurement ont une couche diélectrique recouvrant les électrodes coplanaires ; le panneau selon l'invention comprend des cellules rectangulaires 4R, 4G, 4B disposées en matrice bi-dimensionnelle et des électrodes coplanaires Y1 , Y'1 traversant le panneau selon une direction générale horizontale.Referring to Figure 6, the display panel according to a first embodiment of the invention is comparable to the panel previously described with reference to Figures 1 to 3; emphasis will therefore be placed in the following description only on the differences with the panels of the prior art; for the common elements, reference will therefore be made to the panel previously described; all the panels described later have a dielectric layer covering the coplanar electrodes; the panel according to the invention comprises rectangular cells 4R, 4G, 4B arranged in two-dimensional matrix and coplanar electrodes Y1, Y'1 passing through the panel in a generally horizontal direction.
Chaque cellule est ici délimitée sur l'ensemble de son pourtour par des barrières rectilignes 5, 5' ; les barrières verticales 5 limitent la dimension des cellules dans leur largeur 14, qui est une dimension orientée dans la direction des électrodes coplanaires ; les barrières 5' sont horizontales. Les électrodes coplanaires Y1 , Y'1 comprennent :Each cell is here delimited on its entire periphery by rectilinear barriers 5, 5 '; the vertical barriers 5 limit the size of the cells in their width 14, which is a dimension oriented in the direction of the coplanar electrodes; the barriers 5 'are horizontal. The coplanar electrodes Y1, Y'1 include:
- un bus opaque 10, 10' de distribution du courant de décharge traversant l'ensemble de la dalle, et,an opaque bus 10, 10 ′ for distributing the discharge current passing through the entire slab, and,
- une dérivation 11 , 11' en matériau conducteur transparent, par exemple en « ITO » (« Indium Tin Oxide » en langue anglaise) traversant également l'ensemble de la dalle, et formant une bande continue le long du bus 10, 10', qui est reliée continûment au bus sur toute sa longueur. Dans tous les panneaux selon l'invention ultérieurement décrits en références aux figures 6 à 12, au niveau de chaque cellule, les deux électrodes coplanaires sont symétriques l'une de l'autre par rapport à un point central C, notamment au niveau de leurs bords qui se font face ; comme déjà indiqué, cette caractéristique facilite et améliore le fonctionnement du panneau.- a derivation 11, 11 ′ made of transparent conductive material, for example made of “ITO” (“Indium Tin Oxide” in English) also passing through the entire slab, and forming a continuous strip along the bus 10, 10 ′ , which is continuously connected to the bus over its entire length. In all the panels according to the invention subsequently described with reference to FIGS. 6 to 12, at the level of each cell, the two coplanar electrodes are symmetrical with each other with respect to a central point C, in particular at their facing edges; as already indicated, this characteristic facilitates and improves the operation of the panel.
Les dérivations 11 , 11' des électrodes coplanaires adjacentes Y1 , Y'1 traversant les mêmes cellules 4R, 4G, 4B présentent des bords 6, 6' qui se font face et qui sont séparés par une distance 12 qui est constante sur toute leur longueur ; au niveau de chaque cellule, ces bords sont ici rectilignes sur toute la largeur de la cellule et sont inclinés d'un angle dont la valeur absolue est supérieure à 30° par rapport à l'horizontale ; pour deux cellules adjacentes, l'angle d'inclinaison est alternativement positif et négatif.The branches 11, 11 'of the adjacent coplanar electrodes Y1, Y'1 crossing the same cells 4R, 4G, 4B have edges 6, 6' which face each other and which are separated by a distance 12 which is constant over their entire length ; at the level of each cell, these edges are here rectilinear over the entire width of the cell and are inclined by an angle whose absolute value is greater than 30 ° relative to the horizontal; for two adjacent cells, the angle of inclination is alternately positive and negative.
Grâce à l'inclinaison des bords d'amorçage 6, 6' des électrodes coplanaires Y1 , Y'1 , au niveau de chaque cellule, la longueur 15 des bords d'amorçage de décharge est supérieure à la largeur 14 du rectangle délimitant cette cellule entre deux barrières 5' perpendiculaires aux bus.Thanks to the inclination of the initiating edges 6, 6 ′ of the coplanar electrodes Y1, Y′1, at the level of each cell, the length 15 of the discharge initiating edges is greater than the width 14 of the rectangle delimiting this cell between two barriers 5 'perpendicular to the buses.
Pour une géométrie donnée de forme et de répartition des cellules sur le panneau, l'invention apporte ainsi, pour chaque cellule, des bords d'amorçage de décharge plus longs que dans l'art antérieur, ce qui permet d'augmenter la vitesse d'adressage du panneau, d'allonger sa durée de vie et d'améliorer le rendement lumineux.For a given geometry of shape and distribution of the cells on the panel, the invention thus provides, for each cell, discharge initiation edges longer than in the prior art, which makes it possible to increase the speed d addressing of the panel, lengthen its lifespan and improve the light output.
Le panneau selon l'invention qui vient d'être décrit est fabriqué par des méthodes de fabrication connues en elles-mêmes qui ne seront pas décrites ici en détail ; on fait appel en particulier à des méthodes conventionnelles de fabrication d'électrodes transparentes pour obtenir la forme inclinée des bords caractéristique du mode de réalisation de l'invention.The panel according to the invention which has just been described is manufactured by manufacturing methods known in themselves which will not be described here. in detail ; use is made in particular of conventional methods of manufacturing transparent electrodes in order to obtain the inclined shape of the edges characteristic of the embodiment of the invention.
La figure 11 représente une variante de la figure 6, où la bande continueFigure 11 shows a variant of Figure 6, where the strip continues
11 , 11' en matériau conducteur transparent n'est plus en contact avec le bus 10, 10' continûment sur toute sa longueur, mais seulement au niveau de conducteurs transversaux 19 ; ces conducteurs transversaux, disposés dans chaque cellule en position centrale comme sur la figure ou latérale selon d'autres variantes, forment avantageusement des zones privilégiées d'expansion des décharges.11, 11 'made of transparent conductive material is no longer in contact with the bus 10, 10' continuously over its entire length, but only at the level of transverse conductors 19; these transverse conductors, arranged in each cell in a central position as in the figure or lateral according to other variants, advantageously form privileged areas for expansion of the discharges.
L'invention s'applique tout particulièrement à des panneaux dont les cellules, toujours rectangulaires, voire carrées, sont réparties en quinconce, comme représenté à la figure 7 ; comme précédemment, les bords des électrodes Y1 , Y'1 , plus précisément ceux des dérivations 11 , 11' de ces électrodes, sont inclinés sur toute la largeur des cellules de façon à ce que la longueur de ces bords soit, au niveau de chaque cellule, supérieure à la largeur des cellules, c'est à dire à la dimension des cellules qui s'étend dans la même direction générale que celles des électrodes Y1 , Y'1.The invention is particularly applicable to panels whose cells, always rectangular, even square, are staggered, as shown in Figure 7; as before, the edges of the electrodes Y1, Y'1, more precisely those of the branches 11, 11 'of these electrodes, are inclined over the entire width of the cells so that the length of these edges is, at each cell, greater than the width of the cells, that is to say the size of the cells which extends in the same general direction as those of the electrodes Y1, Y'1.
De préférence, comme représenté à la figure 8, au niveau de chaque cellule, les bords des électrodes Y1 , Y'1 ne sont inclinés qu'au centre des cellules ; au niveau de chaque cellule, ces bords comprennent alors une partie inclinée 61 , 61', et, de part et d'autre, une partie non inclinée, 62 et 62' d'un côté, et 63 et 63' de l'autre côté ; ceci permet d'amorcer les décharges plus facilement loin des barrières et de limiter les pertes électriques à la surface des barrières ; conformément à l'invention, la longueur totale de chaque bord d'amorçage de décharge 15 est la somme de la longueur de la partie non inclinée 62, 62' du premier côté, de celle de la partie inclinée 61 , 61 ' et de celle de la partie non inclinée 63, 63' de l'autre côté ; cette somme est supérieure à la dimension 14 de la cellule mesurée dans la direction générale des électrodes coplanaires Y1 , Y'1 ; de préférence, la portion rectiligne inclinée représente moins de 80% mais plus de 50% de la longueur totale des bords pour chaque cellule.Preferably, as shown in FIG. 8, at the level of each cell, the edges of the electrodes Y1, Y'1 are only inclined at the center of the cells; at the level of each cell, these edges then comprise an inclined part 61, 61 ', and, on both sides, a non-inclined part, 62 and 62' on one side, and 63 and 63 'on the other side; this makes it easier to initiate discharges far from the barriers and to limit the electrical losses at the surface of the barriers; according to the invention, the total length of each discharge initiating edge 15 is the sum of the length of the non-inclined part 62, 62 'on the first side, that of the inclined part 61, 61' and that from the non-inclined part 63, 63 'on the other side; this sum is greater than the dimension 14 of the cell measured in the general direction of the coplanar electrodes Y1, Y'1; preferably, the inclined rectilinear portion represents less than 80% but more than 50% of the total length of the edges for each cell.
Selon une première variante de la figure 8 représentée à la figure 9, qui présente la même structure en quinconce et les mêmes formes de gaps, les dérivations des électrodes coplanaires Y1 , Y'1 sont formées par des barreaux 13, 13' ayant une forme adaptée pour que les bords d'électrodes différentes Y1 , Y'1 qui se font face présentent une portion inclinée 61 , 61' dans chaque cellule ; ici, les barreaux ne sont plus en contact avec le bus sur toute leur longeur. Selon une deuxième variante de la figure 8 représentée à la figure 12, qui présente la même structure en quinconce et les mêmes formes de gaps, les dérivations des électrodes coplanaires Y1 , Y'1 comprennent en outre des conducteurs transversaux 19 qui permettent d'orienter avantageusement l'expansion des décharges au dessus de la couche diélectrique couvrant les électrodes ; on obtient alors de meilleurs rendements lumineux.According to a first variant of FIG. 8 represented in FIG. 9, which has the same staggered structure and the same forms of gaps, the branches of the coplanar electrodes Y1, Y'1 are formed by bars 13, 13 'having a shape adapted so that the edges of different electrodes Y1, Y'1 which face each other have an inclined portion 61, 61 'in each cell; here, the bars are no longer in contact with the bus over their entire length. According to a second variant of FIG. 8 represented in FIG. 12, which has the same staggered structure and the same forms of gaps, the branches of the coplanar electrodes Y1, Y'1 also comprise transverse conductors 19 which make it possible to orient advantageously the expansion of the discharges above the dielectric layer covering the electrodes; better light yields are then obtained.
Selon encore une autre variante représentée à la figure 10, les dérivations 11 , 11 ' ne forment plus une bande conductrice-transparente continue traversant l'ensemble de la dalle comme sur la figure 6, mais sont individualisées 11a, 11'a, ..., 11c, 11'c par cellules a, b, c, comme sur la figure 5 de l'art antérieur ; comme sur la figure 5, la largeur des dérivations est variable d'une cellule à l'autre : 23a pour la cellule 4a, 23b pour la cellule 4b, 23c pour la cellule 4c ; selon l'invention, chaque dérivation 11a, 11 'a, ..., 11c, 11'c offre un front de décharge rectiligne incliné 61 , 61' ; du fait de cette inclinaison, au niveau de chaque dérivation 11a, 11 'a, ..., 11c, 11'c, la longueur des bords d'amorçage de décharge est supérieure à la largeur de dérivation 23a, 23b, 23c ; en outre, selon l'invention, dans chaque cellule, la longueur des bords d'amorçage de décharge est supérieure à la largeur de cette cellule, mesurée entre deux barrières opposées : ainsi, par exemple, la longueur 15c des bords d'amorçage de décharge de la cellule 4c est supérieure à la largeur 14c de cette cellule ; en outre, l'angle d'inclinaison de ces bords est variable d'une cellule à l'autre, ce qui permet avantageusement d'adapter les conditions d'amorçage entre différentes cellules comportant, par exemple, des luminophores de couleurs différentes.According to yet another variant shown in FIG. 10, the branches 11, 11 'no longer form a continuous transparent conductive strip passing through the entire slab as in FIG. 6, but are individualized 11a, 11'a, .. ., 11c, 11'c per cells a, b, c, as in Figure 5 of the prior art; as in FIG. 5, the width of the branches is variable from one cell to another: 23a for cell 4a, 23b for cell 4b, 23c for cell 4c; according to the invention, each branch 11a, 11 'a, ..., 11c, 11'c offers an inclined rectilinear discharge front 61, 61'; due to this inclination, at each branch 11a, 11 'a, ..., 11c, 11'c, the length of the discharge initiating edges is greater than the width of branch 23a, 23b, 23c; furthermore, according to the invention, in each cell, the length of the discharge initiation edges is greater than the width of this cell, measured between two opposite barriers: thus, for example, the length 15c of the initiation edges of cell 4c discharge is greater than the width 14c of this cell; in addition, the angle of inclination of these edges is variable from one cell to another, which advantageously makes it possible to adapt the priming conditions between different cells comprising, for example, phosphors of different colors.
Il convient d'ajouter que la seule inclinaison des bords de décharge dans un panneau dont les électrodes coplanaires comportent des dérivations indépendantes ne suffit pas pour améliorer la luminosité, le rendement et la durée de vie du panneau ; dans un tel cas, la longueur des bords d'amorçage de chaque dérivation est certes supérieure à la largeur de cette dérivation, mais pas forcément à la largeur de la cellule, notamment si la largeur de la dérivation est très inférieure à celle de la cellule ; selon l'invention, l'inclinaison doit être suffisamment importante pour que la longueur des bords d'amorçage soit supérieure à la largeur de la cellule.It should be added that the only inclination of the discharge edges in a panel whose coplanar electrodes have independent leads is not sufficient to improve the brightness, the efficiency and the lifetime of the panel; in such a case, the length of the priming edges of each branch is certainly greater than the width of this branch, but not necessarily to the width of the cell, in particular if the width of the branch is much less than that of the cell ; according to the invention, the inclination must be large enough so that the length of the priming edges is greater than the width of the cell.
L'invention s'applique également aux cas où les bords d'électrodes coplanaires qui se font face présentent plusieurs portions rectilignes inclinées dans chaque cellule, ou présentent des formes courbes, pourvu que, dans chaque cellule du panneau, la longueur des bords d'amorçage de décharge entre les électrodes coplanaires soit supérieure, de préférence d'au moins 20%, à la plus grande des dimensions de cette cellule mesurée dans la direction générale des électrodes coplanaires. L'invention s'applique à toutes les formes de cellules de panneaux coplanaires. The invention also applies to cases where the edges of coplanar electrodes which face each other have several rectilinear portions inclined in each cell, or have curved shapes, provided that, in each cell of the panel, the length of the edges of discharge initiation between the coplanar electrodes is greater, preferably at least 20%, than the largest of the dimensions of this cell measured in the general direction of the coplanar electrodes. The invention applies to all forms of cells of coplanar panels.

Claims

REVENDICATIONS
1.- Panneau de visualisation à plasma comprenant une première dalle (1) et une deuxième dalle (2) ménageant entre elles un espace (3) rempli de gaz de décharge et compartimenté en une matrice bi-dimensionnelle de cellules de décharge (4R, 4G, 4B), la première dalle (1 ) comprenant au moins deux réseaux d'électrodes (Y, Y') pour l'amorçage et l'alimentation de décharges d'entretien dites coplanaires, orientées selon des directions générales parallèles, enchevêtrées de manière à ce que chaque cellule soit traversée par une électrode de chaque réseau, les dimensions de chaque cellule (4R, 4G, 4B) s'étendant dans la direction générale de ces électrodes coplanaires étant limitées par des barrières (5) s'étendant dans une direction générale perpendiculaire à celle des électrodes coplanaires (Y1 , Y'1 ), les électrodes coplanaires adjacentes (Y1 , Y'1) de différents réseaux présentant, au niveau de chaque cellule, des bords (6, 6') qui se font face, qui présentent une symétrie par rapport à un point central de ladite cellule, et qui sont séparés par une distance qui est constante (12) sur une longueur prédéterminée, et qui est supérieure ou égale à la distance minimum correspondant aux conditions d'amorçage de décharge dites de Paschen, caractérisé en ce que, pour chaque cellule (4R, 4G, 4B), ladite longueur des bords d'amorçage de décharge (15) est supérieure à la plus grande (14) desdites dimensions de la cellule dans la direction générale des électrodes coplanaires (Y1 , Y'1 ).1.- Plasma display panel comprising a first panel (1) and a second panel (2) providing between them a space (3) filled with discharge gas and compartmentalized in a two-dimensional matrix of discharge cells (4R, 4G, 4B), the first plate (1) comprising at least two arrays of electrodes (Y, Y ') for initiating and supplying so-called coplanar maintenance discharges, oriented in parallel general directions, entangled with so that each cell is crossed by an electrode of each network, the dimensions of each cell (4R, 4G, 4B) extending in the general direction of these coplanar electrodes being limited by barriers (5) extending in a general direction perpendicular to that of the coplanar electrodes (Y1, Y'1), the adjacent coplanar electrodes (Y1, Y'1) of different networks having, at the level of each cell, edges (6, 6 ') which are made face, which have a symmetry with respect to a central point of said cell, and which are separated by a distance which is constant (12) over a predetermined length, and which is greater than or equal to the minimum distance corresponding to the discharge initiation conditions called of Paschen, characterized in that, for each cell (4R, 4G, 4B), said length of the discharge initiating edges (15) is greater than the largest (14) of said dimensions of the cell in the general direction of coplanar electrodes (Y1, Y'1).
2.- Panneau selon la revendication 1 caractérisé en ce que ladite longueur des bords d'amorçage de décharge (15) est supérieure d'au moins 20% à la plus grande (14) desdites dimensions de la cellule dans la direction générale des électrodes coplanaires (Y1 , Y'1 ).2.- Panel according to claim 1 characterized in that said length of the discharge initiating edges (15) is at least 20% greater than the largest (14) of said dimensions of the cell in the general direction of the electrodes coplanar (Y1, Y'1).
3.- Panneau selon la revendication 1 ou 2, caractérisé en ce que les barrières opposées qui délimitent les cellules le long de ladite plus grande dimension (14) forment des côtés rectilignes de ladite cellule, qui sont perpendiculaires à la direction générale des électrodes coplanaires (Y1 , Y'1).3.- Panel according to claim 1 or 2, characterized in that the opposite barriers which delimit the cells along said larger dimension (14) form rectilinear sides of said cell, which are perpendicular to the general direction of the coplanar electrodes (Y1, Y'1).
4.- Panneau de visualisation à plasma selon l'une quelconque des revendications précédentes, caractérisé en ce que les cellules sont en forme de rectangle dont deux côtés sont parallèles à la direction générale des électrodes coplanaires et en ce que ladite longueur (15) des bords d'amorçage de décharge est supérieure à celle desdits côtés parallèles.4.- plasma display panel according to any one of the preceding claims, characterized in that the cells are in the form of a rectangle, two sides of which are parallel to the general direction of the coplanar electrodes and in that said length (15) of discharge initiating edges is greater than that of said parallel sides.
5.- Panneau de visualisation à plasma selon l'une quelconque des revendications précédentes, caractérisé en ce que, pour chaque cellule, lesdits bords d'amorçage de décharge présentent une portion rectiligne inclinée (6, 6' ; 61 , 61') par rapport à la direction générale des électrodes coplanaires.5.- plasma display panel according to any one of the preceding claims, characterized in that, for each cell, said discharge initiation edges have a rectilinear inclined portion (6, 6 '; 61, 61') by relation to the general direction of the coplanar electrodes.
6.- Panneau de visualisation à plasma selon la revendication 5, caractérisé en ce que, pour chaque cellule, ladite portion rectiligne inclinée est positionnée approximativement à égale distance desdites deux barrières opposées.6.- plasma display panel according to claim 5, characterized in that, for each cell, said inclined rectilinear portion is positioned approximately equidistant from said two opposite barriers.
7.- Panneau selon la revendication 5 ou 6, caractérisé en ce que l'angle d'inclinaison de la dite portion rectiligne par rapport à la direction générale des électrodes coplanaires est, en valeur absolue, compris entre 30° et 60°.7. A panel according to claim 5 or 6, characterized in that the angle of inclination of said straight portion relative to the general direction of the coplanar electrodes is, in absolute value, between 30 ° and 60 °.
8.- Panneau de visualisation à plasma selon l'une quelconque des revendications 5 à 7, caractérisé en ce que, pour deux cellules adjacentes quelconques coupées par les mêmes électrodes coplanaires, ledit angle d'inclinaison est positif pour l'une et négatif pour l'autre.8.- plasma display panel according to any one of claims 5 to 7, characterized in that, for any two adjacent cells cut by the same coplanar electrodes, said angle of inclination is positive for one and negative for the other.
9.- Panneau de visualisation à plasma selon l'une quelconque des revendications précédentes caractérisé en ce que lesdites cellules sont disposées en quinconce (4R, 4G, 4B). 9.- plasma display panel according to any one of the preceding claims, characterized in that said cells are staggered (4R, 4G, 4B).
10.- Panneau de visualisation à plasma selon l'une quelconque des revendications précédentes caractérisé en ce que chaque électrode coplanaire (Y1 , Y' 1) comprend :10.- plasma display panel according to any one of the preceding claims, characterized in that each coplanar electrode (Y1, Y '1) comprises:
- un bus opaque (10, 10') de distribution du courant de décharge traversant l'ensemble de ladite première dalle, et,an opaque bus (10, 10 ′) for distributing the discharge current passing through the whole of said first slab, and,
- au niveau de chaque cellule alimentée par cette électrode, ledit bus étant positionné en arrière du bord d'amorçage de décharge de ladite électrode, au moins une dérivation (11 , 11') s'étendant dudit bus (10, 10') jusqu'au dit bord d'amorçage (6, 6').- at the level of each cell supplied by this electrode, said bus being positioned behind the discharge initiation edge of said electrode, at least one branch (11, 11 ') extending from said bus (10, 10') up to 'at the said priming edge (6, 6').
11.- Panneau de visualisation à plasma selon la revendication 10 caractérisé en ce que ladite première dalle (1) forme la face avant dudit panneau et en ce que ladite deuxième dalle (2) forme la face arrière.11.- plasma display panel according to claim 10 characterized in that said first panel (1) forms the front face of said panel and in that said second panel (2) forms the rear face.
12.- Panneau de visualisation à plasma selon la revendication 11 caractérisé en ce que chaque dérivation comprend des barreaux opaques formant une grille.12.- plasma display panel according to claim 11 characterized in that each derivation comprises opaque bars forming a grid.
13.- Panneau de visualisation à plasma selon la revendication 11 caractérisé en ce que chaque dérivation (11 , 11') est en matériau conducteur transparent.13.- plasma display panel according to claim 11 characterized in that each branch (11, 11 ') is made of transparent conductive material.
14.- Panneau de visualisation à plasma selon la revendication 13 caractérisé en ce que la succession desdites dérivations (11 , 11') le long de chaque électrode coplanaire (Y1 , Y'1) forme une bande continue le long dudit bus (10, 10').14.- plasma display panel according to claim 13 characterized in that the succession of said branches (11, 11 ') along each coplanar electrode (Y1, Y'1) forms a continuous strip along said bus (10, 10 ').
15.- Panneau selon l'une quelconque des revendications précédentes caractérisé en ce que les réseaux d'électrodes de ladite première dalle (1) sont couverts d'une couche diélectrique (7).15.- Panel according to any one of the preceding claims, characterized in that the electrode networks of said first slab (1) are covered with a dielectric layer (7).
16.- Panneau selon l'une quelconque des revendications précédentes caractérisé en ce que ladite deuxième dalle (2) comprend un réseau d'électrodes (X-IR, X-IG> XIB) dites de données croisant les électrodes coplanaires (Y1 , Y'1) au niveau de chaque cellule (4R, 4G, 4B).16.- Panel according to any one of the preceding claims, characterized in that said second slab (2) comprises a network of electrodes (X-IR, X-IG > XIB) called data crossing the coplanar electrodes (Y1, Y'1) at the level of each cell (4R, 4G, 4B).
17.- Panneau selon l'une quelconque des revendications précédentes caractérisé en ce que ladite deuxième dalle (2) et les parois des barrières (5, 5') sont, au moins partiellement, couvertes de luminophores (9R, 9G, 9B). 17.- Panel according to any one of the preceding claims, characterized in that said second panel (2) and the walls of the barriers (5, 5 ') are, at least partially, covered with phosphors (9R, 9G, 9B).
PCT/FR2002/003442 2001-10-10 2002-10-09 Plasma display panel with coplanar electrodes having inclined discharge edges WO2003032357A1 (en)

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FR0113082A FR2830679B1 (en) 2001-10-10 2001-10-10 PLASMA VISUALIZATION PANEL WITH COPLANAR ELECTRODES HAVING INCLINED DISCHARGE EDGES
FR01/13082 2001-10-10

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CN100521039C (en) 2009-07-29
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TWI264034B (en) 2006-10-11

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