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WO2018193695A1 - Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision - Google Patents

Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision Download PDF

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Publication number
WO2018193695A1
WO2018193695A1 PCT/JP2018/004821 JP2018004821W WO2018193695A1 WO 2018193695 A1 WO2018193695 A1 WO 2018193695A1 JP 2018004821 W JP2018004821 W JP 2018004821W WO 2018193695 A1 WO2018193695 A1 WO 2018193695A1
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WO
WIPO (PCT)
Prior art keywords
light source
led
light
led group
group
Prior art date
Application number
PCT/JP2018/004821
Other languages
English (en)
Japanese (ja)
Inventor
裕貴 大川
健太郎 鎌田
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2018193695A1 publication Critical patent/WO2018193695A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

Definitions

  • the present invention relates to a lighting device, a display device, and a television receiver.
  • Patent Document 1 As an example of a backlight device used in a conventional liquid crystal display device, one described in Patent Document 1 below is known.
  • a plurality of light emitting element blocks configured by connecting a plurality of semiconductor light emitting elements in parallel are provided on a single substrate, and the plurality of light emitting element blocks are connected in series.
  • the number of the light emitting elements constituting the light emitting element block located at the center of the series connection arrangement on the substrate is larger than the number of the light emitting elements constituting the other light emitting element blocks. Yes.
  • the present invention has been completed based on the above-described circumstances, and aims to suppress the temperature rise of the light source group and reduce the manufacturing cost.
  • the illumination device of the present invention includes a light guide plate having a light incident end surface on which light is incident on at least a part of an outer peripheral end surface, a plurality of light sources arranged in a line along the light incident end surface, and a plurality of the light sources, Control of driving of the plurality of light source groups so that a plurality of light source groups including a plurality of the light sources arranged in succession and a luminance limited light source group with a maximum luminance limited in the plurality of light source groups are selectively included.
  • a light source control unit Control of driving of the plurality of light source groups so that a plurality of light source groups including a plurality of the light sources arranged in succession and a luminance limited light source group with a maximum luminance limited in the plurality of light source groups are selectively included.
  • the light source control unit controls the driving of the plurality of light source groups by the light source control unit.
  • a plurality of light sources included in the plurality of light source groups are emitted.
  • Light emitted from the plurality of light sources is emitted from the light guide plate after entering the light incident end face of the light guide plate. Since the light source control unit restricts the maximum luminance with respect to the luminance limited light source group that is a specific light source group included in the plurality of light source groups, it is possible to suppress a temperature rise that occurs near the luminance limited light source group. As a result, the light source is less likely to deteriorate or break down due to the temperature rise.
  • the temperature rise of the light source group can be suppressed and the manufacturing cost can be reduced.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
  • Cross section of liquid crystal display Plan view of a backlight device constituting a liquid crystal display device AA line sectional view of FIG.
  • Block diagram showing electrical configuration of liquid crystal display device Circuit diagram showing electrical connection configuration of each LED group Table showing maximum brightness value of each LED group.
  • the figure which shows the state which displayed the white image of 10% of area ratio in the position near the right end of a liquid crystal panel A table showing the luminance value of each LED group when a white image with an area ratio of 10% is displayed near the right end of the liquid crystal panel Sectional drawing of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 2 of this invention.
  • FIGS. 1 and 2 A first embodiment of the present invention will be described with reference to FIGS.
  • a liquid crystal display device 10 and a television receiver 10TV using the same are illustrated.
  • a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing.
  • the upper side shown in FIGS. 2 and 4 is the front side, and the lower side is the back side.
  • a television receiver 10TV includes a liquid crystal display device 10 having a substantially horizontally long overall shape, and both front and back cabinets 10Ca and 10Cb that are accommodated so as to sandwich the liquid crystal display device 10.
  • a power source 10P a tuner (reception unit) 10T that receives a television signal
  • a stand 10S a stand 10S.
  • the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 that displays an image, and a backlight device (illumination device) 12 that supplies light for display to the liquid crystal panel 11. These are integrally held by a frame-like bezel 13 or the like.
  • the screen size of the liquid crystal panel 11 is, for example, 60 inches or more, and is generally classified into a large size or a very large size.
  • the liquid crystal panel 11 is a liquid crystal molecule that is a substance in which a pair of glass substrates are bonded together with a predetermined gap therebetween and the optical characteristics change between the glass substrates with the application of an electric field.
  • the liquid crystal layer (not shown) containing is enclosed.
  • One glass substrate array substrate, active matrix substrate
  • switching elements for example, TFTs
  • an alignment film or the like is provided.
  • the other glass substrate On the inner surface side of the other glass substrate (counter substrate, CF substrate), there is a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a matrix in a predetermined arrangement.
  • a light-shielding layer black matrix arranged in a lattice shape and disposed between the colored portions, a solid counter electrode facing the pixel electrode, an alignment film, and the like are provided.
  • the polarizing plate is distribute
  • the backlight device 12 includes a substantially box-shaped chassis (housing) 14 having a light emitting portion 14b that opens toward the front side (the liquid crystal panel 11 side), and the chassis 14.
  • the optical member (optical sheet) 15 arranged so as to cover the light emitting portion (opening portion) 14b and the frame 16 that supports the optical member 15 from the back side are provided.
  • an LED substrate 18 is disposed at one end in the short side direction (Y-axis direction), and light from the LED 17 is incident on the light guide plate 19 from one side.
  • One side light incident type edge light type (side light type).
  • the chassis 14 is made of metal, and as shown in FIG. 2 and FIG. 3, a bottom 14 a that is substantially horizontally long like the liquid crystal panel 11, and a side 14 c that rises from the outer end of each side of the bottom 14 a. As a whole, it has a shallow, generally box shape that opens toward the front side.
  • the long side direction of the chassis 14 (bottom part 14a) coincides with the X-axis direction (horizontal direction), and the short side direction thereof coincides with the Y-axis direction (vertical direction).
  • the frame 16 and the bezel 13 can be fixed to the side portion 14c.
  • the optical member 15 covers the light emitting portion 14 b of the chassis 14 and is disposed between the liquid crystal panel 11 and the light guide plate 19, thereby allowing the optical member 15 to exit from the light guide plate 19.
  • the incident light is transmitted and emitted toward the liquid crystal panel 11 while applying a predetermined optical action to the transmitted light.
  • the optical member 15 is provided with a plurality of sheets (three in the present embodiment), and specific examples thereof include a diffusion sheet, a lens sheet (prism sheet), a reflective polarizing sheet, and the like. It is possible to select and use as appropriate.
  • the frame 16 has a horizontally long frame-like portion 16 a extending along the outer peripheral edge portions of the light guide plate 19 and the optical member 15.
  • the frame-shaped portion 16a receives and supports the outer peripheral edge of the optical member 15 from the back side over substantially the entire circumference, and supports the outer peripheral edge of the light guide plate 19 from the front side over the entire circumference.
  • a frame-side reflection sheet 22 that reflects light is attached to a surface facing the back side surface (the light guide plate 19 and the LED 17) in one long side portion of the frame-shaped portion 16a.
  • the frame 16 has a liquid crystal panel support portion 16b that protrudes from the frame-shaped portion 16a toward the front side and supports the outer peripheral edge portion of the liquid crystal panel 11 from the back side.
  • the LED 17 has a configuration in which an LED chip is sealed with a sealing material on a substrate portion fixed to the LED substrate 18.
  • the LED 17 has an anode terminal and a cathode terminal (not shown), and a direct current that is forward biased flows between them, so that the LED chip emits light.
  • the LED 17 is such that the LED chip emits, for example, blue light in a single color, and phosphors (yellow phosphor, green phosphor, red phosphor, etc.) are dispersed and blended in the sealing material to emit white light as a whole.
  • the LED 17 has a surface opposite to its light emitting surface 17a mounted on the LED substrate 18 described below, and is a so-called top surface light emitting type.
  • the LED substrate 18 has a plate shape extending along the X-axis direction (longitudinal direction of the light incident end surface 19a), and a pair (two) are arranged in the X-axis direction. It is accommodated in the chassis 14 in an adjacent arrangement along the same.
  • the LED substrate 18 is disposed in such a manner that the mounting surface on which the plurality of LEDs 17 are mounted faces the end surface (light incident end surface 19a) of the light guide plate 19 described below, and the plate surface opposite to the mounting surface of the LED 17 Is attached in contact with the heat radiating member 21.
  • a wiring pattern (not shown) made of a metal film (copper foil or the like) and connected to the terminal of each LED 17 is formed.
  • the number of LEDs 17 installed on the LED board 18 is smaller than the actual number. However, actually, for example, 128 LEDs 17 are mounted on each LED board 18. .
  • the LED substrate 18 extends along the X-axis direction and is mounted with an LED mounting portion (light source mounting portion) 18a on which a plurality of LEDs 17 are mounted, and the LED mounting portions 18a to Z And a power supply projecting portion 18b projecting toward the back side (the heat radiating portion 21b side) along the axial direction.
  • a plurality of LEDs 17 are mounted in a line along the X-axis direction with a certain interval.
  • a board-side connector (power supply connection portion) 23 for supplying power to the LED 17 is mounted on the surface of the power supply protrusion 18b facing the light guide plate 19 side.
  • the power supply protrusion 18b and the board-side connector 23 are arranged in pairs at positions that are symmetrical with respect to the X-axis direction (the arrangement direction of the LEDs 17) on the LED board 18. Thereby, since a pair of LED board 18 used for the backlight apparatus 12 can be made into a common structure, it becomes suitable when reducing the manufacturing cost which concerns on the LED board 18.
  • the power supply projecting portion 18b is arranged so as to project to the back side of the chassis 14 through an opening portion 14a1 formed in the bottom portion 14a of the chassis 14 (including an opening portion 21b1 of the heat radiating member 21 described later).
  • a board-side connector 23 is disposed on the protruding portion from the board.
  • a wiring-side connector (power supply side connecting portion) 24 a provided at the end of a wiring member (power feeding member) 24 connected to an LED drive circuit board (not shown) is fitted and connected to the board-side connector 23.
  • the light guide plate 19 is made of a substantially transparent synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate), and has a refractive index sufficiently higher than that of air. As shown in FIGS. 2 and 3, the light guide plate 19 has a horizontally long plate shape similar to the liquid crystal panel 11 and the like, and is enclosed in a shape surrounded by the chassis 14. It is arranged at a position directly below the optical member 15.
  • the light guide plate 19 has an end face on the long side of one of the outer peripheral end faces (the left side shown in FIG. 2) facing the LED 17, and a light incident end face (light source facing end face) on which light from the LED 17 is incident. 19a.
  • the light guide plate 19 has a plate surface facing the front side (the liquid crystal panel 11 side) as a light output plate surface 19b that emits light toward the liquid crystal panel 11, and the plate surface facing the back side. Is a light output opposite plate surface 19c opposite to the light output plate surface 19b.
  • the light guide plate 19 introduces light emitted from the LED 17 along the Y-axis direction from the light incident end surface 19a, and after propagating the light inside, rises along the Z-axis direction. And has a function of emitting light toward the optical member 15 side (front side, light emission side) from the light exit plate surface 19b.
  • the reflection sheet 20 is arranged so as to cover the light output opposite plate surface 19 c of the light guide plate 19.
  • the reflection sheet 20 is excellent in light reflectivity, and can efficiently start up light leaking from the light output opposite plate surface 19c of the light guide plate 19 toward the front side (light output plate surface 19b side).
  • the reflection sheet 20 has an outer shape that is slightly larger than that of the light guide plate 19, and one end portion on the long side thereof is arranged so as to protrude from the light incident end surface 19 a toward the LED 17.
  • the heat dissipating member 21 is made of a metal having excellent thermal conductivity such as aluminum. As shown in FIGS. 2 and 3, the heat radiating member 21 extends along the X-axis direction, and the length dimension thereof is equal to the long side dimension of the light guide plate 19. A pair of LED substrates 18 are attached to the heat radiating member 21 in a state of being adjacent to each other along the X-axis direction.
  • the heat dissipating member 21 has a substantially L-shaped cross-section, and is led from an LED substrate attachment portion (light source substrate attachment portion) 21a to which a pair of LED substrates 18 are attached, and an end on the back side of the LED substrate attachment portion 21a.
  • the LED board mounting portion 21 a has a plate surface parallel to the plate surface of the LED substrate 18, and the plate surface opposite to the LED substrate 18 side is arranged in contact with the side portion 14 c of the chassis 14.
  • the heat radiating portion 21 b has a plate surface parallel to the plate surface of the light guide plate 19 and the bottom portion 14 a of the chassis 14, and the plate surface opposite to the light guide plate 19 side (the reflection sheet 20 side) is the bottom portion of the chassis 14. 14a is arranged in contact with 14a.
  • the heat dissipating part 21b has a larger area than the LED board attaching part 21a, and is a part mainly responsible for the heat dissipating function in the heat dissipating member 21.
  • the heat generated from each LED 17 along with the light emission is transmitted from the LED board 18 to the LED board mounting portion 21a and the heat radiating portion 21b of the heat radiating member 21, and then to the side portion 14c and the bottom portion 14a of the chassis 14. It is supposed to be dissipated.
  • An opening 21b1 through which the power supply protrusion 18b and the board-side connector 23 are passed is formed in a portion of the heat dissipation part 21b that overlaps with the power supply protrusion 18b and the board-side connector 23 of the LED board 18 in plan view.
  • the opening 21b1 of the heat radiating portion 21b communicates with the opening 14a1 formed in the bottom 14a of the chassis 14.
  • a total of four openings 14 a 1 and 21 b 1 are provided at positions overlapping with the power supply protrusions 18 b provided on the pair of LED boards 18 and the board-side connector 23.
  • the liquid crystal display device 10 includes a panel control unit 25 for controlling the driving of the liquid crystal panel 11 and an LED control for controlling the driving of the LEDs 17 included in the backlight device 12.
  • Part (light source control part) 26 at least.
  • the panel control unit 25 includes a video signal processing circuit unit 27 that processes a video signal, and a pixel driving unit 28 that drives each pixel based on an output signal from the video signal processing circuit unit 27. Is provided.
  • the control board is provided with a CPU 29 for controlling the operations of the video signal processing circuit unit 27, the pixel driving unit 28, and the LED driving unit 30 described later.
  • the LED control unit 26 includes an LED drive unit 30 that drives the LED 17 based on an output signal from the video signal processing circuit unit 27, and is provided on the LED drive circuit board.
  • the operation of the LED drive unit 30 is controlled by the CPU 29 of the control board, and is synchronized with the operation of the pixel drive unit 28.
  • the LED control unit 26 includes a plurality of LED groups (light source groups) 31 including a plurality of LEDs 17 that are continuously arranged among the plurality of LEDs 17 that are arranged in a line along the X-axis direction. Are controlled individually.
  • one LED group 31 is composed of 16 LEDs 17 that are continuously arranged along the X-axis direction and connected in series with each other, and the total number of LED groups 31 is 16.
  • the LED control unit 26 determines whether or not to turn on a total of 16 LED groups 31 based on a display range of an image displayed on the display surface 11DS as each pixel is driven by the pixel driving unit 28, for example. Can be controlled individually.
  • the LED control unit 26 supplies a pulse signal to each LED group 31, and a time ratio between a lighting period and a non-lighting period (non-lighting period) in each LED group 31 ( The amount of emitted light per unit time is controlled by adjusting the (duty ratio). That is, the LED control unit 26 performs PWM (Pulse Width Modulation) dimming driving that periodically blinks each LED group 31 and changes the time ratio between the lighting period and the extinguishing period.
  • PWM Pulse Width Modulation
  • the LED substrate 18 on the right side (left side shown in FIG. 3) shown in FIG. 4 includes the first LED group 31A to the eighth LED group 31H, whereas the LED substrate 18 on the left side (right side shown in FIG. 3) shown in FIG. On the substrate 18, the ninth LED group 31I to the sixteenth LED group 31P are arranged.
  • the LED drive unit 30 of the LED control unit 26 includes the same number of LED drive circuits 32 that are individually connected to the LED groups 31 as the LED groups 31.
  • the one connected to the first LED group 31A is a first LED drive circuit 32A
  • the one connected to the second LED group 31B is a second LED drive circuit 32B.
  • What is connected to the third LED group 31C is a third LED drive circuit 32C
  • what is connected to the fourth LED group 31D is a fourth LED drive circuit 32D
  • what is connected to the fifth LED group 31E is a fifth LED drive circuit 32E.
  • the sixth LED driving circuit 32F is connected to the sixth LED group 31F
  • the seventh LED driving circuit 32G is connected to the seventh LED group 31G
  • the eighth LED driving circuit 32H is connected to the eighth LED group 31H.
  • the ninth LED group 31I is connected to the ninth LED group 31I as the ninth LED drive circuit 32I.
  • the one connected to 31M is the thirteenth LED drive circuit 32M
  • the one connected to the fourteenth LED group 31N is the fourteenth LED drive circuit 32N
  • the one connected to the fifteenth LED group 31O is the fifteenth LED drive circuit 32O
  • the sixteenth LED group The 16th LED drive circuit 32P is connected to 31P.
  • the heat radiating portion 21b constituting the heat radiating member 21 has an opening 21b1 through which the power supply protrusion 18b of the LED board 18 and the board-side connector 23 pass, as shown in FIGS. Is formed.
  • the heat radiation performance is locally reduced in the vicinity of the opening 21 b 1 in the heat radiating member 21 together with the opening 21 b 1 itself, and this is the low heat radiating portion 33.
  • the LED 17 arranged in the vicinity of such a low heat dissipation portion 33 is likely to increase in temperature due to insufficient heat dissipation, and in some cases, the performance of the LED 17 is deteriorated or the LED 17 is broken. There is a fear.
  • the LED control unit 26 provided in the backlight device 12 has a luminance limited LED group (luminance limited light source) in which the maximum luminance is limited to the plurality of LED groups 31. Group) 34 is selectively included, and the driving of the plurality of LED groups 31 is controlled.
  • FIG. 7 is a relative value of the maximum luminance of each LED group 31 controlled by the LED control unit 26.
  • the “maximum luminance value” in FIG. 7 is based on the maximum luminance of the LED 17 that can be allowed by the standard (100%). In FIG. 7, when the numerical value of the maximum luminance is 100%, the LED control unit 26 is substantially the target. This means that the maximum brightness of the LED group 31 is not limited.
  • FIG. 7 is a relative value of the maximum luminance of each LED group 31 controlled by the LED control unit 26.
  • the “maximum luminance value” in FIG. 7 is based on the maximum luminance of the LED 17 that can be allowed by the standard (100%). In FIG. 7, when the numerical value of the maximum luminance is 100%, the
  • the LED control unit 26 substantially has the maximum of the target LED group 31. It means that the brightness is limited.
  • the maximum luminance of the luminance limited LED group 34 is limited by the LED control unit 26, it is possible to suppress a temperature rise that occurs in the vicinity of the luminance limited LED group 34. As a result, the LED 17 is less likely to deteriorate or malfunction due to a temperature rise.
  • the brightness limiting LED group 34 will be described in detail. First, as shown in FIGS. 3 and 4, among the LED groups 31, the sixth LED group 31F to the tenth LED group 31J arranged on the center side in the X-axis direction serve as the center-side LED group 35, and both ends in the X-axis direction.
  • the first LED group 31A to the fourth LED group 31D and the twelfth LED group 31L to the sixteenth LED group 31P arranged on the side are referred to as end-side LED groups 36, and the center-side LED group 35 and the end-side LED groups 36 in the X-axis direction
  • the sixth LED group 31 ⁇ / b> F and the eleventh LED group 31 ⁇ / b> K disposed therebetween are referred to as an intermediate LED group 37.
  • the LED control unit 26 controls driving so that the end-side LED group 36 and the intermediate LED group 37 include the luminance-restricted LED group 34 among the above.
  • the LED control unit 26 sets the maximum luminance value of the central LED group 35 to “100%”, which is substantially unlimited, and the maximum luminance value of the end LED group 36 is the central LED group. It is controlled to be “80%”, which is lower than the maximum luminance value of 35. If it does in this way, the light quantity supplied by the center side LED group 35 distribute
  • the light quantity supplied by the end-side LED group 36 arranged on the end side in the X-axis direction of the light guide plate 19 is limited as compared with the center side, so that the display quality of the liquid crystal display device 10 is excellent. It will be.
  • the LED control unit 26 indicates that the maximum brightness value of the intermediate LED group 37 is lower than the maximum brightness value of the central LED group 35, but is higher than the maximum brightness value of the end LED group 36. % ". In this way, in the light guide plate 19, the amount of light supplied from each LED group 31 gradually decreases from the center side to the end side in the X-axis direction. Thereby, the display quality of the liquid crystal display device 10 becomes more excellent.
  • the sixth LED group 31F and the eleventh LED group 31K which are the intermediate LED group 37 controlled by the LED control unit 26 as the luminance limited LED group 34, are included in the entire LED group 31 as shown in FIG. It is the arrangement closest to the opening 21b1 which is the low heat dissipation portion 33.
  • the temperature of the LED substrate 18 is likely to rise locally due to the opening 21b1 that is the low heat dissipation portion 33 of the heat dissipation member 21, the first closest to the opening 21b1 that is the low heat dissipation portion 33
  • the LED control unit 26 By controlling the driving of the 6LED group 31F and the 11th LED group 31K by the LED control unit 26 so as to become the brightness limited LED group 34, it is possible to suitably suppress the temperature rise that occurs in the vicinity of the 6th LED group 31F and the 11th LED group 31K. it can.
  • the two board-side connectors 23 arranged at symmetrical positions in the X-axis direction on the LED board 18 have a center position CP and an end position EP in the X-axis direction on the LED board 18. It is unevenly distributed on the center position CP side with respect to the intermediate position IP. Therefore, the above-described LED substrate 18 is also used for the two opening portions 21b1 (low heat dissipation portion 33) overlapping the two substrate-side connectors 23 in plan view and the sixth LED group 31F and the eleventh LED group 31K that are closest to each other.
  • the center position CP is unevenly distributed with respect to the intermediate position IP.
  • the sixth LED group 31F and the eleventh LED which are the luminance limiting LED group 34, are compared with the case where two board-side connectors are arranged at the intermediate position IP between the center position CP and the end position EP.
  • the light emitted from the sixth LED group 31F and the eleventh LED group 31K as the brightness limiting LED group 34 is about the X-axis direction in the light guide plate 19 by the amount that the group 31K is unevenly distributed on the center position CP side with respect to the intermediate position IP. It becomes difficult to be supplied to the center side of.
  • the central LED group 35 that is the LED group 31 whose maximum luminance is not limited is easily supplied to the central side in the alignment direction in the light guide plate 19, the central side in the alignment direction in the light guide plate 19. A sufficient amount of light can be ensured.
  • each LED group 31A to 31P is illustrated by an arrow line, while the white image display range is illustrated in white, and the non-display range in which the white image is not displayed is shaded.
  • the LED control unit 26 turns on the central LED group 35 and the intermediate LED group 37 with the respective maximum luminance values, and the end LED group 36 is more than the maximum luminance value. It is turned on or off with a low luminance value.
  • the intermediate LED group 37 is lit with the maximum luminance value, the maximum luminance value is limited to 90%. Therefore, the intermediate LED group 37 is the luminance value of the central LED group 35 in which the maximum luminance value is not substantially limited. Compared to a certain 100%, the value is relatively low.
  • the sixth LED group 31F and the eleventh LED group 31K are deteriorated. It is difficult for breakdowns to occur.
  • the fifth LED group 31E and the twelfth LED group 31L adjacent to the intermediate LED group 37 on the end side have a luminance value of 20%, and further the fourth LED group adjacent to the end side.
  • the 31D and thirteenth LED groups 31M are lit at a luminance value of 5%, and the other LED groups 31A to 31C and 31N to 31P are not lit.
  • the area ratio of the white image displayed on the display surface 11DS of the liquid crystal panel 11 is 10%, and the arrangement is further to the right in the figure than the center position in the X-axis direction on the display surface 11DS.
  • the arrangement range of each of the LED groups 31A to 31P is shown by arrows, while the white image display range is shown in white, and the non-display range where no white image is displayed is shaded. Is shown. In this case, as shown in FIG.
  • the LED control unit 26 includes the eighth LED group 31H to the tenth LED group 31J as the central LED group 35, the eleventh LED group 31K as the intermediate LED group 37, and the end LED group.
  • the twelfth LED group 31L and the thirteenth LED group 31M, which are 36, are lit with their respective maximum luminance values, and the other LED groups 31 are lit with a luminance value lower than the maximum luminance value or not lit. Is done.
  • the eleventh LED group 31K which is the intermediate LED group 37, is lit with the maximum luminance value, the maximum luminance value is limited to 90%, so the central LED whose maximum luminance value is not substantially limited Compared to 100%, which is the luminance value of the group 35, the numerical value is relatively low.
  • the seventh LED group 31G and the fourteenth LED group 31N adjacent to the end side with respect to the LED group 31 that is lit at the maximum luminance value described above have a luminance value of 20%, and further the sixth LED group adjacent to the end side.
  • the LED group 31F and the fifteenth LED group 31O are each lit at a luminance value of 5%, and the other LED groups 31A to 31E and 31P are not lit.
  • the LED control unit 26 includes a tenth LED group 31J that is the central LED group 35, an eleventh LED group 31K that is the intermediate LED group 37, and a twelfth LED that is the end LED group 36.
  • the group 31L to the fifteenth LED group 31O are lit with their respective maximum luminance values, and the other LED groups 31 are lit with a luminance value lower than the maximum luminance value or not lit.
  • the eleventh LED group 31K, which is the intermediate LED group 37 is lit with the maximum luminance value, the maximum luminance value is limited to 90%, so the central LED whose maximum luminance value is not substantially limited Compared to 100%, which is the luminance value of the group 35, the numerical value is relatively low.
  • the ninth LED group 31I and the sixteenth LED group 31P adjacent to the end side with respect to the LED group 31 that is lit at the maximum luminance value described above have a luminance value of 20% and are further adjacent to the end side.
  • 31H is lit at a luminance value of 5%, and the other LED groups 31A to 31G are not lit.
  • the backlight device (illumination device) 12 has a light guide plate 19 having a light incident end surface 19a on which light is incident on at least a part of the outer peripheral end surface, and a line along the light incident end surface 19a.
  • the maximum luminance is limited to a plurality of LEDs (light source) 17 arranged in a row, a plurality of LED groups (light source group) 31 composed of a plurality of LEDs 17 successively arranged among the plurality of LEDs 17, and the plurality of LED groups 31.
  • An LED control unit (light source control unit) 26 that controls driving of the plurality of LED groups 31 is provided so that a luminance limited LED group (luminance limited light source group) 34 is selectively included.
  • each of the plurality of LEDs 17 included in the plurality of LED groups 31 emits light.
  • Light emitted from the plurality of LEDs 17 enters the light incident end surface 19 a of the light guide plate 19 and then exits from the light guide plate 19. Since the LED control unit 26 restricts the maximum luminance for the luminance limited LED group 34 that is a specific LED group 31 included in the plurality of LED groups 31, it suppresses a temperature rise that occurs in the vicinity of the luminance limited LED group 34. be able to. As a result, the LED 17 is less likely to deteriorate or malfunction due to a temperature rise.
  • the plurality of LED groups 31 include a central LED group 35 that is disposed relatively to the center side in the arrangement direction of the plurality of LEDs 17 and an end LED group 36 that is disposed relatively to the end side in the arrangement direction.
  • the LED control unit 26 controls the end-side LED group 36 to include the brightness-restricted LED group 34 so that the maximum brightness is lower than the maximum brightness related to the center-side LED group 35. . If it does in this way, the light quantity supplied by the center side LED group 35 distribute
  • the amount of light supplied by the end-side LED group 36 arranged on the end side in the arrangement direction of the plurality of LEDs 17 is limited as compared with the center side.
  • the incident light is used as illumination light for the liquid crystal display device 10, the display quality is excellent.
  • the plurality of LED groups 31 include an intermediate LED group 37 arranged between the central LED group 35 and the end LED group 36 in the arrangement direction, and the LED control unit 26 includes the intermediate LED group
  • the luminance limiting LED group 34 is included in 37 and the maximum luminance is lower than the maximum luminance related to the central LED group 35, but is controlled to be higher than the maximum luminance related to the end LED group 36. In this way, the amount of light supplied from each LED group 31 gradually decreases from the center side to the end side in the alignment direction in the light guide plate 19. Thus, for example, when the light emitted from the light guide plate 19 is used as illumination light for the liquid crystal display device 10, the display quality is excellent.
  • the LED control unit 26 controls the driving so that the maximum luminance of the central LED group 35 is 100%. In this way, since the maximum luminance of the central LED group 35 is not limited and light emission at 100% is possible, the central LED group 35 supplies the light to the central side in the alignment direction of the light guide plate 19. The maximum amount of light can be secured.
  • the LED control unit 26 controls the drive so that the LED group 31 closest to the low heat dissipation unit 33 among the plurality of LED groups 31 is the luminance limited LED group 34. In this way, although the LED substrate 18 is likely to rise in temperature locally due to the low heat dissipation portion 33 of the heat dissipation member 21, the LED group 31 closest to the low heat dissipation portion 33 becomes the luminance limited LED group 34.
  • the LED control unit 26 it is possible to suitably suppress the temperature rise that occurs in the vicinity of the brightness limited LED group 34.
  • the heat dissipation member 21 is connected to the LED substrate attachment portion (light source substrate attachment portion) 21 a to which the LED substrate 18 is attached and the LED substrate attachment portion 21 a and extends in parallel with the plate surface of the light guide plate 19.
  • the LED board 18 includes at least a heat radiation part 21b that is superposed on the optical plate 19, and a board side connector (power supply connection part) 23 to which a wiring member (power supply member) 24 is connected is connected to the LED board 18 on the heat radiation part 21b side.
  • an opening 21b1 is provided as a low heat radiating portion 33 in a portion of the heat radiating portion 21b that overlaps with the board-side connector 23.
  • the board-side connector 23 to which the wiring member 24 is connected is provided in the LED board 18 so as to protrude toward the heat radiating part 21b, but in the part of the heat radiating part 21b that overlaps the board-side connector 23, Since the opening 21b1 is provided, the board-side connector 23 can be passed through the opening 21b1.
  • the opening 21b1 is a low heat radiating part 33 having a locally low heat radiating property in the heat radiating part 21b, but the LED control unit 26 controls the drive so that the LED group 31 closest to the opening 21b1 becomes the luminance limited LED group 34. By doing so, the temperature rise which arises in the brightness
  • the LED board 18 includes a plurality of LED groups 31 and a plurality of board-side connectors 23, and a plurality of the LED boards 18 are arranged side by side along the light incident end surface 19 a.
  • substrate 18 it distribute
  • the LED board 18 has two board-side connectors 23 and two are arranged side by side along the light incident end face 19a.
  • the two board-side connectors 23 are arranged on the LED board 18. It is unevenly distributed on the center position Cp side with respect to the intermediate position IP between the center position CP and the end position EP in the direction.
  • the two LED groups 31 that are closest to the opening 21 b 1 through which the two board-side connectors 23 are passed are defined as the luminance-restricted LED group 34.
  • the brightness limiting LED group 34 is arranged at the intermediate position IP.
  • the amount of light emitted from the luminance-restricted LED group 34 is less likely to be supplied to the central side in the alignment direction of the light guide plate 19 by the amount unevenly distributed on the central position CP side. That is, the light emitted from the LED group 31 whose maximum luminance is not limited is easily supplied to the center side in the alignment direction in the light guide plate 19, so that the amount of light supplied to the center side in the alignment direction in the light guide plate 19 is sufficient. Can be secured.
  • the LED control unit 26 blinks the LED 17 periodically to change the time ratio between the lighting period and the extinguishing period.
  • PWM Pulse Width Modulation
  • the liquid crystal display device (display device) 10 includes the backlight device 12 described above and a liquid crystal panel (display panel) 11 that displays an image using light emitted from the backlight device 12. And comprising. According to the liquid crystal display device 10 having such a configuration, the temperature rise of the LED group 31 is suppressed, and the manufacturing cost is suitably suppressed, so that the reliability is excellent and the manufacturing cost can be reduced. .
  • the television receiver 10TV includes the liquid crystal display device 10 described above. According to such a television receiver 10TV, the durability is excellent and the price competitiveness is excellent.
  • three LED substrates 118 are arranged side by side along the X-axis direction.
  • the central one is the central LED board 118C
  • the two ends are the pair of end LED boards 118E.
  • Each LED board 118 includes six LED groups 131. Therefore, among the LED groups 131, the LED group 131A located at the right end shown in FIG. 14 is the first LED group 131A, and the LED group 131R located at the left end of the figure is the 18th LED group 131R.
  • the two board-side connectors 123 arranged at symmetrical positions in the X-axis direction in the pair of end-side LED boards 118E are intermediate positions between the center position CP and the end position EP in the X-axis direction in the end-side LED board 118E. It is unevenly distributed on the center position CP side with respect to IP.
  • the two board-side connectors 123 arranged at symmetrical positions in the X-axis direction on the central LED board 118C are between the central position CP and the end position EP in the X-axis direction on the central LED board 118C. It is unevenly distributed on the end position EP side with respect to the intermediate position IP.
  • the two opening parts 121b1 (low heat dissipation part 133) overlapping the two board side connectors 123 in plan view on the center side LED board 118C and the seventh LED group 131G and the twelfth LED group 131L that are closest to each other are also provided.
  • the center position LED substrate 118C is unevenly distributed on the end position EP side with respect to the intermediate position IP.
  • the center LED group 135 includes the eighth LED group 131H to the eleventh LED group 131K, and the end LED group 136 includes the first LED group 131A to the sixth LED group 131F, The 13th LED group 131M to the 18th LED group 131R are included, and the middle LED group 137 includes the seventh LED group 131G and the twelfth LED group 131L.
  • the two board-side connectors are arranged at the intermediate position IP between the center position CP and the end position EP in the center-side LED board 118C, the brightness limiting LED group 134 is the first.
  • each of the end-side LED boards 118E two board-side connectors 123 and two openings 121b1 (low heat dissipation parts 133) that overlap each other in plan view and the third LED group 131C that is the closest arrangement thereof,
  • the 4LED group 131D, the 15th LED group 131O, and the 16th LED group 131P are also unevenly distributed on the center position CP side with respect to the intermediate position IP of each end-side LED board 118E. In this way, it is the brightness limited LED group 134 as compared with the case where the two board-side connectors are arranged at the intermediate position IP between the center position CP and the end position EP in each end-side LED board 118E.
  • the third LED group 131C, the third LED group 131C, which is the luminance limiting LED group 134, is equivalent to the amount of the third LED group 131C, the fourth LED group 131D, the fifteenth LED group 131O, and the sixteenth LED group 131P that are unevenly distributed on the central position CP side with respect to the intermediate position IP.
  • Light emitted from the 4LED group 131D, the 15th LED group 131O, and the 16th LED group 131P is hardly supplied to the center side in the X-axis direction of the light guide plate.
  • a portion of the heat dissipation member that is not in contact with the chassis can be a low heat dissipation portion.
  • the part which a heat radiating member contacts the member with comparatively low heat conductivity can become a low heat radiating part.
  • the number of installed LED boards is an even number such as 4, 6, it is preferable to adopt the configuration described in Embodiment 1 (a configuration in which the board-side connector is unevenly distributed on the center position side with respect to the intermediate position).
  • the configuration described in the second embodiment the configuration in which the board-side connector is unevenly distributed on the end position side with respect to the intermediate position in the central LED board.
  • the number and arrangement of specific LED groups included in the brightness limiting LED group, the central LED group, the end LED group, and the intermediate LED group can be changed as appropriate. is there.
  • a top-emitting LED is shown, but a side-emitting LED can be used as a light source. Moreover, it is also possible to use light sources (organic EL etc.) other than LED.
  • the one-side light incident type backlight device in which the end surface on one long side in the outer peripheral end surface of the light guide plate is used as the light incident end surface is exemplified. It may be a one-side light incident type backlight device in which one end surface on the short side is the light incident end surface.
  • the planar shape of the liquid crystal display device (liquid crystal panel or backlight device) is a horizontally long square is shown, but the planar shape of the liquid crystal display device is a vertically long square, square, An oval shape, an elliptical shape, a circular shape, a trapezoidal shape, a shape having a partially curved surface, or the like may be used.
  • the specific application of the liquid crystal display device can be changed as appropriate.
  • SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 17 ... LED (light source), 18, 118 ... LED substrate (light source substrate), 19 ... Guide Light plate, 19a ... Light incident end face, 21 ... Heat radiation member, 21a ... LED board mounting part (light source board mounting part), 21b ... Heat radiation part, 21b1, 121b1 ... Opening part, 23, 123 ... Board side connector (power supply connection part) , 24 ... Wiring member (power supply member), 26 ... LED control unit (light source control unit), 31, 131 ... LED group (light source group), 33, 133 ...
  • low heat dissipation unit 34, 134 ... luminance limited LED group (luminance) Restricted light source group), 35, 135 ... center side LED group (center side light source group), 36 ... end side LED group (end side light source group), 37 ... intermediate LED group (intermediate light source group), CP ... center position, EP ... End position, IP ... Medium Position

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un dispositif de rétroéclairage (12) comprenant : une plaque de guidage de lumière (19) possédant une surface d'extrémité d'entrée de lumière (19a), dans laquelle de la lumière est incidente sur au moins une partie de la surface d'extrémité périphérique externe ; une pluralité de DEL (17) agencées en ligne le long de la surface d'extrémité d'entrée de lumière (19a) ; une pluralité de groupes de DEL (31) comprenant chacun la pluralité de DEL (17) alignées de manière continue parmi la pluralité de DEL (17) ; et une unité de commande de DEL (26) destinée à commander l'excitation de la pluralité de groupes de DEL (31) de telle sorte qu'un groupe de DEL à luminosité limitée (34), dans lequel la luminosité maximale est limitée, est sélectivement inclus dans la pluralité de groupes de DEL (31).
PCT/JP2018/004821 2017-04-21 2018-02-13 Dispositif d'éclairage, dispositif d'affichage, et dispositif de réception de télévision WO2018193695A1 (fr)

Applications Claiming Priority (2)

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JP2017084689A JP6920867B2 (ja) 2017-04-21 2017-04-21 照明装置、表示装置及びテレビ受信装置
JP2017-084689 2017-04-21

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WO2018193695A1 true WO2018193695A1 (fr) 2018-10-25

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KR102352628B1 (ko) 2017-04-11 2022-01-18 엔테그리스, 아이엔씨. 실리콘에 비해 실리콘-게르마늄을 선택적으로 에칭하기 위한 배합물

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007109553A (ja) * 2005-10-14 2007-04-26 Toshiba Matsushita Display Technology Co Ltd 照明装置及び液晶表示装置
JP2011249087A (ja) * 2010-05-25 2011-12-08 Sanyo Electric Co Ltd 表示装置
WO2012137765A1 (fr) * 2011-04-06 2012-10-11 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et dispositif récepteur de télévision
JP2013037076A (ja) * 2011-08-04 2013-02-21 Toshiba Corp 表示装置及び輝度制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007109553A (ja) * 2005-10-14 2007-04-26 Toshiba Matsushita Display Technology Co Ltd 照明装置及び液晶表示装置
JP2011249087A (ja) * 2010-05-25 2011-12-08 Sanyo Electric Co Ltd 表示装置
WO2012137765A1 (fr) * 2011-04-06 2012-10-11 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et dispositif récepteur de télévision
JP2013037076A (ja) * 2011-08-04 2013-02-21 Toshiba Corp 表示装置及び輝度制御方法

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