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WO2003046942A2 - Tube de visualisation et dispositif d'affichage - Google Patents

Tube de visualisation et dispositif d'affichage Download PDF

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Publication number
WO2003046942A2
WO2003046942A2 PCT/IB2002/004800 IB0204800W WO03046942A2 WO 2003046942 A2 WO2003046942 A2 WO 2003046942A2 IB 0204800 W IB0204800 W IB 0204800W WO 03046942 A2 WO03046942 A2 WO 03046942A2
Authority
WO
WIPO (PCT)
Prior art keywords
electron
ebg
ebb
ebr
display screen
Prior art date
Application number
PCT/IB2002/004800
Other languages
English (en)
Other versions
WO2003046942A3 (fr
Inventor
Nijs C. Van Der Vaart
Willibrordus A. J. A. Van Der Poel
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2002348914A priority Critical patent/AU2002348914A1/en
Publication of WO2003046942A2 publication Critical patent/WO2003046942A2/fr
Publication of WO2003046942A3 publication Critical patent/WO2003046942A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/023—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof secondary-electron emitting electrode arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/481—Electron guns using field-emission, photo-emission, or secondary-emission electron source
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4824—Constructional arrangements of electrodes

Definitions

  • the invention relates to a display tube comprising: an electron source for emitting electrons; a module comprising a guidance cavity having an entrance aperture, an exit aperture situated in an end face of the module, and a wall for emitting a secondary electron after receiving an electron; beam-shaping means for forming an electron beam from secondary electrons at the location of the exit aperture, and a display screen for receiving the electron beam and for generating an image by means of the electron beam.
  • the invention also relates to a display device comprising such a display tube.
  • An embodiment of such a display tube is the cathode ray tube which is known from WO 01/26131.
  • the cathode ray tube has an electron gun of the "Hopping Electron Cathode" type.
  • Such an electron gun comprises the module which is provided with a guidance cavity with an entrance aperture and an exit aperture.
  • the wall of the guidance cavity consists at least partly of an emitter material which emits a secondary electron after receiving an incident electron.
  • the emitter material is preferably insulating and has a secondary electron emission coefficient ⁇ . This is the number of secondary electrons which is released from the emitter material with energy Ep as a result of the incidence of an electron on the emitter material.
  • the electron gun comprises the beam-shaping means for forming an electron beam from secondary electrons.
  • they comprise a hop electrode for applying a first electric field having an intensity El which substantially provides for transport of secondary electrons to the exit aperture.
  • the exit aperture has a small surface with respect to the surface of the entrance aperture, the electron beam can be formed at a relatively high beam current density, during operation, from the secondary electrons at the location of the exit aperture.
  • the display screen receives the electron beam.
  • the display screen is provided with pixels of phosphors which luminesce when the electron beam impinges on the pixel. In this way, an image can be displayed.
  • the known display tube has the drawback that the displayed image generally does not have a desired quality throughout the display screen. For example, near the edges and particularly in the corners of the display screen, the displayed image is hazier than in the center of the display screen.
  • the beam-shaping means are adapted to form an electron lens by means of which a shape of the electron beam is changeable for at least partly compensating an undesired change of the shape of the electron beam between the exit aperture and the display screen.
  • the invention is based on the recognition that the image of the electron beam on the display screen generally does not have a shape throughout the display screen which is required for displaying a high-quality image.
  • an unwanted change may occur in the shape of the electron beam between the exit aperture and the display screen.
  • spot changes with the landing spot where the display screen receives the electron beam, so that pixels near the edges and particularly in the corners of the display screen are relatively blurred.
  • the shape of the electron beam near the exit aperture can be suitably changed by means of the electron lens so that the unwanted change of the spot can at least partly be compensated for at least a part of the display screen.
  • the beam-shaping means comprise a first electrode which is divided into at least four segments which, in operation, receive at least two different voltages.
  • This embodiment provides a great freedom of design in realizing a desired electron lens.
  • a quadrupolar lens or a cylindrical lens can be formed by suitably chosen voltages.
  • the beam-shaping means may adapt the shape of the electron beam in a relatively simple way to the desired shape. By using dynamic voltages, the shape can be changed during operation. A relatively low voltage sweep is sufficient for this purpose.
  • this electron lens similarly as in the known cathode ray tube, may have a rotationally symmetrical component for adapting the diameter of the electron beam to the main lens.
  • a quadrupolar lens can be formed, for example, in that a first segment and a second segment are situated on both sides of the exit aperture in a first direction, and, in operation, receive a first voltage, and a third segment and a fourth segment are situated on both sides of the exit aperture in a second direction perpendicular to the first direction, and, in operation, receive a second voltage.
  • the display tube may comprise self-convergent deflection means for varying a landing spot of the electron beam on the display screen. It is then advantageous if the shape of the electron beam is dynamically changeable in dependence upon the landing spot of the electron beam on the display screen.
  • the landing spot of the electron beam can be varied by applying an electromagnetic field, hereinafter referred to as deflection field, deflecting the electrons, by way of deflection means.
  • deflection field generally has a dipole component.
  • the self-convergent deflection field has higher even order components, for example, sixth-order or tenth-order components. Due to such higher-order components, the deflection field acts on the electron beam as an electron lens, for example, a six-pole field acts on the electron beam as a quadrupolar lens so that astigmatism occurs.
  • the electron beam In a vertical direction, the electron beam is focused by the deflection field, with the electron beam remaining in focus in a horizontal direction, but growing.
  • the spot then has an elliptical core with a relatively large eccentricity in the horizontal direction, from which core a haze extends in the vertical direction.
  • the shape of the electron beam generally does not change to an equal extent throughout the display screen.
  • the change is, for example, stronger as the electron beams land further away from the center of the display screen because the strength of the deflection field and the distance covered by the electron beam between the exit aperture and the display screen increase.
  • the electron lens decreases the exit aperture angle of the electron beam in the vertical direction, i.e. the angle at which the paths of the outer electrons in the electron beam extend to each other near the exit aperture. Consequently, the core of the spot grows in the vertical direction and the ellipticity of the core is reduced. The spot is less hazy and the image quality is improved.
  • the exit aperture angle preferably changes in the vertical direction in dependence upon the landing spot of the electron beam.
  • the exit aperture may be imaged on the display screen by means of a main lens.
  • the display tube may then comprise a correction element which is generally placed between the module and the main lens.
  • a correction element is the DAF element which is known from US-A-4,814,670.
  • the DAF element comprises an electron-optical quadrupolar lens whose power varies in dependence upon the deflection of the electron beam, and also reduces the power of the main lens.
  • the electron beam can also be held substantially in focus in the vertical direction throughout the display screen. Near the edges, and particularly in the corners of the display screen, the spot is then elliptical with a relatively large eccentricity in the horizontal direction. It has been found that the electron lens formed by the beam-shaping means can compensate the ellipticity of the spot substantially throughout the display screen so that a spot having a desired shape and a satisfactory focusing is displayed substantially throughout the display screen. The image quality is satisfactory and relatively uniform throughout the display screen.
  • the beam-shaping means comprise a hop electrode for transporting secondary electrons in the guidance cavity substantially towards the exit aperture.
  • the hop electrode receives a hop voltage Nhop for transporting the secondary electrons, which hop voltage is larger than the first voltage Nl and the second voltage V2.
  • the hop electrode and the first electrode are preferably situated substantially in the same plane near the end face of the module, the hop electrode being situated within an aperture in the first electrode.
  • the voltages Nhop, Nl and N2 may be relatively limited.
  • the four segments of the first electrode have substantially the same surface.
  • the configuration of the first electrode is thereby symmetrical. This is advantageous if the electron lens has a rotationally symmetrical component.
  • the adaptation of the diameter of the electron beam to the main lens is then very uniform.
  • an electron lens can be formed by the beam-shaping means, which electron lens comprises a multipolar lens of an even order which is higher than a fourth order.
  • the electron lens comprises a six-pole lens or an eight-pole lens.
  • An eight-pole lens can be used, for example, for reducing lens errors in the main lens.
  • the eight-pole lens reduces, for example, spherical aberrations.
  • a six-pole lens is advantageous if the deflection field has, for example, a relatively strong component of the tenth order so that the shape of the electron beam at the area of the deflection means changes due to coma. This can in any case be partly compensated in that the beam-shaping electron lens comprises a six-pole lens.
  • the first electrode has eight segments.
  • An electron lens comprising, for example, an eight-pole lens can be formed with this embodiment by applying at least two different voltages to the segments.
  • a display device comprises a cathode ray tube as described hereinbefore.
  • Fig. 1 shows an embodiment of the cathode ray tube according to the invention
  • Fig. 2 is a side elevation of the module for use in the cathode ray tube
  • Fig. 3 is a front elevation of a first embodiment of an electrode configuration for the cathode ray tube according to the invention
  • Fig. 4 shows the spot in the known cathode ray tube and in the cathode ray tube according to the invention
  • Fig. 5 is a front elevation of a second embodiment of an electrode configuration
  • Fig. 6 is a display device comprising a cathode ray tube according to the invention.
  • the electron gun 1 In a cathode ray tube CRT according to the invention, the electron gun 1 generates an electron beam EB and focuses this beam by means of a main lens 50, which is present in the electron gun 1, on the display screen 3.
  • deflection means 2 To be able to change the landing spot of the electron beam EB on the display screen 3, deflection means 2, which are self- convergent in the horizontal direction, surround the neck of the cathode ray tube.
  • the electron gun 1 is a HEC electron gun comprising a module 20 with transport cavities 25R, 25G, 25B for transporting electrons.
  • the cathode ray tube is provided with separate and corresponding electron sources 10R, 10G, 10B, respectively.
  • This is a thermionic cathode in which, in operation, electrons are emitted by heating the cathode by means of a filament.
  • Separate second electrodes 15R, 15G, 15B for applying a second electric field are arranged between each electron source 10R, 10G, 10B, respectively, and the module 20. This second electric field withdraws released electrons from the electron sources 10R, 10G, 10B and accelerates them to the associated transport cavities 25R, 25G, 25B of the module 20.
  • the second electrodes 15R, 15G, 15B By changing the strength of the second electric field by means of the second electrodes 15R, 15G, 15B, the number of electrons entering the associated transport cavities 25R, 25G, 25B can be adapted and hence the current density of the associated electron beams EBR, EBG, EBB can be modulated at the location of the exit apertures 27R, 27G, 27B.
  • the second electrodes 15R, 15G, 15B are, for example, grids consisting of molybdenum, with an electron transmission of 60%.
  • the module 20, shown in greater detail in Figs. 2 and 3, is provided with transport cavities 25R, 25G, 25B with entrance apertures 26R, 26G, 26B and exit apertures 27R, 27G, 27B.
  • the transport cavities 25R, 25G, 25B have, for example, a frusto-conical shape which is symmetrical around the central axes 29R, 29G, 29B.
  • At least apart of the walls 28R, 28G, 28B of the transport cavities 25R, 25G, 25B near the exit apertures 27R, 27G, 27B consists of emitter material having an electron emission coefficient ⁇ for emitting a secondary electron after receiving an electron.
  • Hop electrodes 31, 32, 33 are present near the exit apertures 27R, 27G, 27B on the surface 22 of the module 20 facing the display screen 3.
  • the hop electrodes 31, 32, 33 receive a hop voltage Nhop for applying a first electric field El for transporting the secondary electrons in the transport cavities 25R, 25G, 25B to the exit apertures 27R, 27G, 27B.
  • the transport cavities 25R, 25G, 25B transport the electrons by means of a hop process in which as many electrons leave the transport cavities 25R, 25 G, 25B as enter them.
  • the electron emission coefficient ⁇ of the emitter material should on average be equal to 1 over the transport cavities.
  • the emitter material has a relatively high maximum electron emission coefficient ⁇ max.
  • the field strength of the first electric field El and hence the hop voltage Nhop can then remain relatively limited.
  • Nhop is, for example, 1000 volts.
  • the emitter material comprises, for example, magnesium oxide (MgO) and may have a layer thickness of 0.5 micrometer.
  • the emitter material may comprise glass, polyamide, yttrium oxide (Y 2 O 3 ) or silicon nitride (Si 3 ⁇ ).
  • the part of the surface 21 of the module 20 facing the electron sources 10R, 10G, 10B is provided with the emitter material. Consequently, emitted electrons which initially land next to the entrance apertures 26R, 26G, 26B on the surface 21 can release secondary electrons at that area, which as yet enter the transport cavities 25R, 25G, 25B under the influence of the first electric field El.
  • the electrons emitted by the electron source 10 are used as efficiently as possible. It is possible to place the electron sources 10R, 10G, 10B and the transport cavities 25R, 25G, 25B eccentrically. For example, the fraction of emitted electrons which exit from the exit apertures 27R, 27G, 27B without an interaction with the walls 28R, 28G, 28B can be reduced. These electrons have a larger energy than the secondary electrons and influence the image of the electron beams EBR, EBG, EBB.
  • the module 20 may comprise aluminum oxide (Al 2 O 3 ).
  • the relatively large initial faces of the transport cavities 25R, 25G, 25B are the entrance apertures 26R, 26G, 26B, i.e.
  • the relatively small end faces of the transport cavities 25R, 25G, 25B are the exit apertures 27R, 27G, 27B, i.e. circular apertures having a diameter of, for example, 40 micrometers.
  • the angle at which the walls 28R, 28G, 28B extend to the central axes 29R, 29G, 29B is generally between 30 and 60 degrees, for example, 35 degrees.
  • the first electrodes 34, 35, 36 are arranged concentrically with the hop electrodes 31, 32, 33 on the surface 22.
  • the hop electrodes 31, 32, 33 and the first electrodes 34, 35, 36 jointly constitute a planar electron lens and have a thickness LI of, for example, 2.5 micrometers.
  • Such an electrode configuration can be made by vapor-depositing a metal layer on a part of the surface 22.
  • the metal layer comprises, for example, chromium and aluminum. Subsequently, the desired configuration of the hop electrodes 31, 32, 33 and the first electrodes 34, 35, 36 can be provided in the metal layer.
  • the module 20 comprises an insulating material, for example, aluminum oxide (Al 2 O 3 ) which, in operation, can charge locally. If this happens, it disturbs the electric field near the exit apertures 27R, 27G, 27B and the shape of the electron beam EB near the exit apertures 27R, 27G, 27B may change to an unwanted extent. It is therefore desirable if the electrodes 31 to 36 cover a maximal part of the surface 22 near the exit apertures 27R, 27G, 27B. Consequently, a disturbance of the electric field due to charging of the module 20 can be inhibited as much as possible.
  • Al 2 O 3 aluminum oxide
  • Fig. 3 shows an exit aperture 27R with the associated hop electrode 31 and the first electrode 34.
  • the configuration of the hop electrodes 32, 33 and the first electrodes 35, 36 for the other exit apertures 27G, 27B is identical and not shown.
  • the hop electrode 31 is circular with a diameter D2 and, at the location of the exit aperture 27R, provided with an aperture for passing exiting electrons.
  • the diameter Dl of the aperture is substantially equal to that of the exit aperture 27R, for example, 40 micrometers.
  • the first electrode 34 comprises four segments 34A to 34D and is provided with a circular aperture having an inner diameter D3 within which the corresponding hop electrode 31 is arranged concentrically.
  • the distance D3-D2 between the first electrode 34 and the hop electrode 31 should be such that there is no discharge in the vacuum between the electrodes 31 , 34, under the influence of the voltage difference between the electrodes 31, 34.
  • D2 is, for example, 200 micrometers and D3 is, for example, 225 micrometers.
  • the first segment 34A and the second segment 34B are situated on both sides of the exit aperture 27R in the vertical direction and, in operation, receive the first voltage Nl.
  • the third segment 34C and the fourth segment 34D are situated on both sides of the exit aperture 27R in the horizontal direction and, in operation, receive the second voltage N2.
  • the electron beams EBR, EBG, EBB are focused by the main lens 50 on the display screen 3.
  • a focusing electrode 45 for accelerating the exiting electrons near the exit apertures 27R, 27G, 27B is situated between the module 20 and the main lens 50, likewise as a DAF element 40 for compensating astigmatism and defocusing.
  • the spot acquires an elliptical shape with a great eccentricity in the horizontal direction near the edges and particularly in the corners of the display screen 3.
  • the first voltage Nl is then, for example, a variable voltage and the second voltage N2 is a fixed voltage.
  • variable voltage VI can be changed in dependence upon the landing spot of the electron beams EBR, EBG, EBB on the display screen 3. Particularly, the variable voltage Nl will be smaller as the electron beams EBR, EBG, EBB land nearer to the corners of the display screen 3. An electron lens can thereby be formed with the first electrodes 34, 35, 36 so as to compensate the great eccentricity in the horizontal direction of the electron beam EB near the edges of the display screen 3.
  • the first voltage Nl and the second voltage N2 are substantially equal, for example, both 600 V. With this voltage, the first electrodes 34, 35, 36 give the electron beams EBR, EBG, EBB such a diameter that the main lens 50 is well filled.
  • the first voltage Nl decreases.
  • the first voltage Nl is equal to 550 N and the second voltage N2 is equal to 600 N.
  • the second voltage N2 may vary dynamically and the first voltage VI may be a fixed voltage, or both the first voltage Nl and the second voltage N2 may vary dynamically.
  • the effect of the quadrupolar lens formed by the first electrodes 34, 35, 36 on the electron beam EB is shown in Fig. 4.
  • the spot SA is the image of the electron beams EBR, EBG, EBB near a corner of the display screen 3 in the known display tube with self-convergent deflection means 2. It can be seen that the spot SA has a core with an elliptic shape whose long axis coincides with the horizontal direction. In the vertical direction, the spot SA is overfocused so that a haze extends from the core in the vertical direction.
  • the beam-shaping means 30 may form an electron-optical lens which reduces the electron beam EB in the vertical direction and enlarges, if desired, in the horizontal direction.
  • the electron lens becomes more powerful and the electron beams EBR, EBG, EBB are reduced in the vertical direction.
  • the eccentricity of the spots SA, SB can be compensated in the horizontal direction.
  • the image of the electron beams EBR, EBG, EBB is now substantially uniform throughout the display screen 3.
  • the electron beam reduced in the vertical direction has a smaller aperture angle in the vertical direction near the display screen. Consequently, the spot in the vertical direction is enlarged and has a desired shape for display throughout the display screen 3, such as spot SC.
  • An alternative electrode configuration has circular hop electrodes 131, 132, 133 and first electrodes 134, 135, 136 consisting of eight segments 134A to 134H, 135A to 135H, 136A to 136H near the exit apertures 127R, 127G, 127B.
  • the hop electrodes 131, 132, 133 receive a fixed hop voltage Nhop.
  • This alternative electrode configuration is shown in Fig. 5 for the exit aperture 127R.
  • the other exit apertures 127G, 127B have identical configurations of the segments 135 A to 135H, 136A to 136H of the associated first electrodes.
  • the eight segments 134A to 134H each extend at an angle of approximately 45 degrees along the hop electrode 131 and are separated by a gap having such a dimension that no electric breakdown takes place in the gap under the influence of the voltage differences to be applied between the segments 134A to 134H.
  • the segments 134A, 134E are situated on both sides of the exit aperture 127R.
  • the segments 134C, 134G are situated on both sides of the exit aperture 127R.
  • the angular segments 134B, 134D, 134F, 134H are situated diagonally on both sides of the exit aperture 127R.
  • Such a configuration forms a beam-shaping element having a great flexibility, which can be used for various purposes.
  • a fixed voltage of 600 N is applied to the segments 134A, 134C, 134E, 134G and, for example, a fixed voltage of 550 N is applied to the segments 134B, 134D, 134F, 134H.
  • This configuration is also advantageous when square exit apertures 127R, 127G, 127B are used.
  • electron beams EBR, EBG, EBB are obtained which have a rounder shape than the exit apertures 127R, 127G, 127B.
  • These electron beams EBR, EBG, EBB are more in conformity with the shape desired for display.
  • the voltages Nl, N2 may have dynamic components so as to shape the elecfron beams EBR, EBG, EBB with great flexibility, for example, in dependence upon the landing spots of the elecfron beams EBR, EBG, EBB on the display screen 3. This may be advantageous, for example, if the magnetic field of the deflection means 2 has relatively strong higher order components.
  • a color display device is shown in Fig. 6.
  • the color display device comprises the embodiment of the cathode ray tube as shown in Fig. 1.
  • the display screen 3 has rows and columns of pixels and is provided with red, green and blue phosphors.
  • Each electron beam EBR, EBG, EBB corresponds to one of the phosphors on the display screen 3.
  • the module 20 has corresponding fransport cavities 25R, 25G, 25B for each color.
  • the display device receives the picture information to be displayed, which is converted by a control unit A into position signals Px, Py and modulation signals PR, PG, PB.
  • the position signals Px, Py are applied to a deflection circuit D which generates a deflection current therefrom for controlling the deflection means 2.
  • the electron beams EBR, EBG, EBB can be deflected throughout the display screen 3 so that the elecfron beams EBR, EBG, EBB can land on each pixel of the display screen 3.
  • the phosphors of this pixel then luminesce to a stronger extent as the beam current of the corresponding electron beams EBR, EBG, EBB is larger.
  • the modulation signals PR, PG, PB are applied to the electron sources 10R, 10G, 10B, respectively, for controlling the elecfron emission by the electron sources 10R, 10G, 10B and thereby modulating the beam current of the elecfron beams EBR, EBG, EBB.
  • the color displayed by a given pixel of the display screen 3 can thus be changed in conformity with the picture information. Every second, the elecfron beams EBR, EBG, EBB land, for example, 50 or 100 times on each pixel.
  • the position signals Px, Py are applied to a hop circuit H which supplies the voltages Nl, N2 to the module 220.
  • the hop circuit H varies the voltage difference V2-N1 in dependence upon the position signals Px, Py.
  • the voltage difference N2-N1 increases at the electron beams EBR, EBG, EBB land further away from the center C of the display screen 3.
  • the elecfron beams EBR, EBG, EBB near the exit apertures 27R, 27G, 27B become more elliptic in the vertical direction as the deflection is larger.
  • the ellipticity of the elecfron beams EBR, EBG, EBB in the horizontal direction can thereby be compensated so that the elecfron beams EBR, EBG, EBB are substantially uniform throughout the display screen 3 and a picture of the desired quality can be displayed throughout the display screen.
  • the invention may generally be useful for compensating a distortion of the elecfron beam which occurs between the exit aperture and the display screen.
  • ⁇ on-limitative examples are the compensation of some influence of a deflection field on the elecfron beam, the compensation of lens errors in the main lens, the compensation of alignment errors occurring during manufacture of the electron-optical system or the compensation of changing of any element in the display tube influencing the elecfron beam.
  • Any reference sign placed between parentheses shall not be construed as limiting the claim.
  • Use of the verb "comprise” and its conjugations does not exclude the presence of elements other than those stated in the claims.
  • Use of the article "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

L'invention concerne un tube de visualisation comprenant une source (10) d'électrons, un module (20) pourvu d'une cavité (25R, 25G, 25B) de guidage qui guide les électrons émis par ladite source (10) vers un orifice de sortie (27R, 27G, 27B) de ladite cavité (25R, 25G, 25B), et un dispositif de mise en forme de faisceau (30) qui forme un faisceau d'électrons (EBR, EBG, EBB) à partir des électrons guidés sortant l'orifice de sortie (27R, 27G, 27B). Le faisceau d'électrons (EBR, EBG, EBB) se dirige vers un écran d'affichage (3). Le dispositif de mise en forme de faisceau (30) est conçu de manière à constituer, en fonctionnement, une lentille d'électrons destinée à former ledit faisceau d'électrons (EBR, EBG, EBB) de façon à compenser d'éventuelles distorsions indésirables au niveau de la forme dudit faisceau (EBR, EBG, EBB) entre l'orifice de sortie (27R, 27G, 27B) et l'écran d'affichage (3). Ces distorsions sont, par exemple, provoquées par le champ magnétique de dispositifs de déviation (2). La qualité de l'image du tube de visualisation s'en trouve améliorée.
PCT/IB2002/004800 2001-11-27 2002-11-15 Tube de visualisation et dispositif d'affichage WO2003046942A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002348914A AU2002348914A1 (en) 2001-11-27 2002-11-15 Display tube and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP01204559 2001-11-27
EP01204559.7 2001-11-27

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Publication Number Publication Date
WO2003046942A2 true WO2003046942A2 (fr) 2003-06-05
WO2003046942A3 WO2003046942A3 (fr) 2004-06-10

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AU (1) AU2002348914A1 (fr)
TW (1) TW200409169A (fr)
WO (1) WO2003046942A2 (fr)

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CN1348600A (zh) * 1999-12-24 2002-05-08 皇家菲利浦电子有限公司 彩色显示装置
JP2004510303A (ja) * 2000-09-27 2004-04-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 陰極線管
WO2002041342A2 (fr) * 2000-11-20 2002-05-23 Koninklijke Philips Electronics N.V. Dispositif d'affichage et tube cathodique
JP2004527891A (ja) * 2001-06-01 2004-09-09 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 電子銃、陰極線管及び画像表示装置
US20040140751A1 (en) * 2001-06-01 2004-07-22 Van Der Vaart Nijs Cornelis Display tube and display device
JP2005501378A (ja) * 2001-08-28 2005-01-13 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Ｈｅ−ｃｒｔのプリフォーカスレンズ
WO2003041039A2 (fr) * 2001-11-09 2003-05-15 Koninklijke Philips Electronics N.V. Dispositif d'affichage a vide

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WO2003046942A3 (fr) 2004-06-10
AU2002348914A1 (en) 2003-06-10
AU2002348914A8 (en) 2003-06-10

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