WO2011089778A1 - 照明装置、表示装置およびテレビ受信装置 - Google Patents
照明装置、表示装置およびテレビ受信装置 Download PDFInfo
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- WO2011089778A1 WO2011089778A1 PCT/JP2010/070343 JP2010070343W WO2011089778A1 WO 2011089778 A1 WO2011089778 A1 WO 2011089778A1 JP 2010070343 W JP2010070343 W JP 2010070343W WO 2011089778 A1 WO2011089778 A1 WO 2011089778A1
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- led
- cooling body
- leds
- cooling
- control unit
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- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
- F28D2021/0031—Radiators for recooling a coolant of cooling systems
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- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133601—Illuminating devices for spatial active dimming
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
Definitions
- the present invention relates to an illuminating device including an LED as a light source, a display device in which the illuminating device is arranged on the back surface of a display panel, and a television receiver including the display device.
- a liquid crystal display device including a light transmission type liquid crystal display panel generally has an illumination device disposed on the back side of the liquid crystal display panel.
- This illuminating device is a device that includes a fluorescent lamp such as a cold cathode tube as a light source, and adjusts the characteristics of light emitted from the fluorescent lamp to irradiate the back surface of the liquid crystal display panel. The irradiated light passes through the liquid crystal display panel, so that an image is displayed in a visible state on the front side of the liquid crystal display panel.
- LEDs light-emitting diodes
- Patent Document 1 discloses a structure for cooling an LED.
- FIG. 11 shows an LED substrate described in Patent Document 1 and an illumination device including the LED substrate.
- (A) is a cross-sectional view of the LED substrate, and (b) is an illumination in which a plurality of LED substrates are arranged in parallel. It is a top view of an apparatus.
- the LED substrate 201 has a plurality of LEDs 204 mounted on an upper surface of a flat tube 202 having a long shape via an insulating layer 203.
- a plurality of flow paths 202a through which the coolant flows are formed inside the flat tube 202 that is the base material of the LED substrate 201.
- the lighting device 200 has a plurality of such LED boards 201 arranged in parallel, and headers 205 and 206 communicating with the flat tubes 202 are attached to both ends of the LED boards 201, respectively.
- the cooling liquid can be simultaneously supplied to the plurality of flat tubes 202.
- the headers 205 and 206 are piped to a radiator 207 which is an air-cooled heat exchanger for cooling the coolant, a piston reciprocating pump 208 for flowing the coolant, and a tank 209 for securing the amount of the coolant.
- the LEDs 204 are connected to each other via 210, and the cooling of the LED 204 is performed by circulating the coolant through the flat tube 202 and the radiator 207 of the LED substrate 201.
- the lighting device 200 described above has a cooling structure that cools all the LEDs 204, even when some of the LEDs 204 are turned on without turning on all the LEDs 204, not only the lighted LEDs 204 but also the lights are turned off. LED 204 is also cooled, and there is a problem that the cooling liquid is not used efficiently because deterioration of the cooling liquid to be used is accelerated and the cooling performance is lowered, that is, the LED 204 cannot be sufficiently cooled. is there.
- the problem to be solved by the present invention is to provide an illuminating device, a display device, and a television receiver capable of improving the utilization efficiency of a cooling liquid used for cooling an LED.
- a lighting device includes a plurality of LEDs, a chassis having a receiving surface in which the plurality of LEDs are arranged vertically and horizontally, and positions corresponding to the arrangement of the LEDs in the chassis.
- a plurality of cooling bodies each having a flow path through which a cooling liquid flows and an on-off valve for opening and closing the flow path, a radiator for exchanging heat between the cooling liquid and air, and the cooling
- a pump connected to the body and the radiator and circulating the coolant, an LED control unit for controlling the driving of the LED, and an on-off valve of the cooling body associated with the LED based on the driving of the LED
- the gist of the present invention is to include a cooling body control unit that controls driving.
- the LED control unit controls the driving (lighting / extinguishing) of the plurality of LEDs, and the cooling body control unit associates the cooling body on-off valve with the LED driving.
- LED that is, the cooling operation of the LED due to the flow of the coolant through the cooling body can be controlled. Therefore, for example, the on / off valve of the cooling body associated with the lit LED is driven to cool the LED by the cooling body, and the on / off valve of the cooling body associated with the unlit LED is driven. Therefore, it is possible to control that the LED is not cooled by the cooling body.
- the cooling body by selectively operating the cooling body, it is possible to selectively cool LEDs that have generated heat due to lighting, and temporarily turn off all the LEDs provided in the lighting device. Regardless, the LED that needs to be cooled can be efficiently cooled and the early deterioration of the coolant can be prevented as compared with the one that cools the entire LED. This prevents a decrease in cooling performance due to early deterioration of the coolant, and improves the utilization efficiency of the coolant.
- each of the cooling bodies has a configuration in which a plurality of the LEDs are associated with each other, if any of the plurality of LEDs associated with the cooling body is lit, Since the on / off valve of the cooling body is driven in conjunction with it, the lit LED can be cooled. Moreover, compared with the case where a cooling body is individually associated and installed for each LED, the number of cooling bodies installed can be reduced.
- the cooling body is arranged at a substantially central position between adjacent LEDs, the adjacent LEDs can be cooled almost uniformly, so that the cooling body efficiently cools the lit LEDs. can do.
- the on-off valve of the cooling body is a flow rate adjusting valve, and is controlled by the cooling body control unit so as to increase or decrease the flow rate of the coolant flowing through the cooling body according to the driving of the associated LED.
- the cooling body control unit controls the cooling body control unit so as to increase or decrease the flow rate of the coolant flowing through the cooling body according to the driving of the associated LED.
- the on-off valve can open the valve at an opening of 3/4 with respect to the full opening. is there.
- the current flowing through the LED was increased in order to increase the brightness of the LED, the flow rate of the coolant flowing through the cooling body was increased accordingly and the brightness was increased accordingly. Accordingly, it is possible to actively cool the LED that has generated more heat.
- the flow rate of the coolant flowing through the cooling body can be increased / decreased according to the number of LEDs that are associated in this way and the brightness of the LEDs, the heated LED can be efficiently cooled. . Moreover, since the temperature rise of a cooling fluid can also be suppressed, it is possible to fully cool a cooling fluid with a radiator.
- the cooling body is arranged on the back side opposite to the housing surface of the chassis, the vicinity of the cooling body in the chassis is cooled.
- the LED is indirectly cooled.
- the cooling body since the LED and the cooling body do not exist on the same side with respect to the chassis, it is easy to install the LED and the cooling body.
- the cooling body has a configuration in which a heat conductive sheet is interposed on the rear surface of the chassis, the heated LED can be efficiently cooled by the cooling body.
- a display device includes a display panel having a region for displaying an image, and the above-described illumination device disposed on the back side of the display panel. It is what.
- the plurality of LEDs arranged on the housing surface of the chassis of the lighting device are individually cooled by the plurality of cooling bodies through which the coolant flows according to the lighting / extinction of each LED. As a result, it is possible to prevent early deterioration of the coolant and improve its utilization efficiency.
- the display device includes an image signal processing unit that processes a signal related to the image, and a display panel control unit that controls driving of the display panel based on an output signal from the image signal processing unit.
- the LED control unit and the cooling body control unit may be configured to control driving of the LEDs and the on / off valves of the cooling body based on an output signal from the image signal processing unit.
- the display device having such a configuration, by controlling the LED drive by the LED control unit based on the output signal from the image signal processing unit, for example, as shown in FIG. While the LED corresponding to the area other than the display area is turned on, the LED corresponding to the black display area can be turned off (not lit). Thereby, the contrast characteristic of a display image can be improved. Then, by controlling the operation of the cooling body by the cooling body control unit based on the output signal from the image signal processing unit, the cooling body associated with the lit LED is operated while being turned off (not lit) By not operating the cooling body associated with the LED, the LEDs that need to be cooled can be efficiently cooled, and the utilization efficiency of the coolant can be improved.
- the present invention it is possible to selectively cool an LED that has generated heat with lighting by a cooling body through which a coolant flows, and temporarily turn off and turn on all the LEDs provided in the lighting device. Regardless of this, the LED that needs to be cooled can be efficiently cooled and the early deterioration of the cooling liquid can be prevented as compared with the case where the entire LED is cooled.
- FIG. 1 is an exploded perspective view schematically showing the television receiver according to the present embodiment.
- the television receiver 100 includes a liquid crystal display device 1, a tuner 101, and a speaker 102, and a power supply substrate 103 that supplies power to the liquid crystal display device 1, the tuner 101, and the speaker 102.
- the liquid crystal display device 1, the tuner 101, the speaker 102, and the power supply substrate 103 are housed in a housing constituted by a front cabinet 104 and a back cabinet 105, and are further supported by a stand 106.
- FIG. 2 is an exploded perspective view schematically showing the liquid crystal display device 1 according to the present embodiment
- FIG. 3 is an enlarged cross-sectional view showing the main part of the liquid crystal display device 1.
- the liquid crystal display device 1 includes a bezel 2, a liquid crystal display panel 3, and a lighting device 4.
- the bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with a chassis 14 included in an illumination device described later.
- the liquid crystal display panel 3 includes a pair of glass substrates each composed of a thin film transistor (TFT) array substrate and a color filter (CF) substrate, which are bonded in parallel with a predetermined distance therebetween, and the liquid crystal is sealed between the two glass substrates. It has a stopped configuration.
- TFT thin film transistor
- CF color filter
- a plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate, and a plurality of color filters are formed in a matrix on the CF substrate, and a common electrode is formed on almost the entire surface.
- An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the first electrode and the common electrode.
- the liquid crystal display panel 3 is driven and controlled by a liquid crystal display panel control unit 42 as shown in FIG.
- the liquid crystal display panel control unit 42 outputs a control signal to the liquid crystal display panel 3 based on the output signal output from the image signal processing unit 41 and controls the driving of the liquid crystal display panel 3.
- the liquid crystal display panel control unit 42 controls the driving of the liquid crystal display panel 3.
- light is emitted from the illumination device 4 to the back surface of the liquid crystal display panel 3, whereby a predetermined image is displayed in the image display area of the liquid crystal display panel 3.
- the image signal processing unit 41 performs image processing based on the image signal input from the tuner 101 via the antenna 40, and outputs the image-processed signal to the liquid crystal display panel control unit 42 or the like.
- the lighting device 4 is a so-called direct type lighting device (backlight device) disposed on the back surface of the liquid crystal display panel 3 described above.
- the illumination device 4 includes a frame 5, optical sheets 7 to 9, a diffusion plate 10, an LED substrate 12, and a chassis 14.
- the frame 5 has a frame shape, and is used to fix the optical sheets 7 to 9 and the diffusion plate 10 to the peripheral portion of the chassis 14 in a state where they are laminated in this order from above.
- the optical sheets 7 to 9 and the diffusion plate 10 are optical members that adjust the characteristics (refraction, diffraction, reflection, etc.) of light incident on the liquid crystal display panel 3 from the plurality of LEDs 13 provided on the LED substrate 12.
- the chassis 14 is formed into a shallow box shape by bending a metal plate made of aluminum or the like, and can accommodate the optical sheets 7 to 9, the diffusion plate 10, and the LED substrate 12.
- the diffuser plate 10 is a plate-shaped resin product having a rectangular shape in plan view, and the light distribution from the LED 13 can be diffused to make the luminance distribution uniform in the plane.
- the thickness is about 2 to 3 mm.
- the three optical sheets 7 to 9 are thin sheet-like resin products having a rectangular shape in plan view.
- the optical sheets 7 to 9 use, for example, a deflection selective reflection sheet 7 having a thickness of about 0.1 to 0.5 mm, a lens sheet 8 and a diffusion sheet 9 in order from the top. Stacked and arranged.
- the diffusion sheet 9 is for further uniforming the luminance distribution by further diffusing the light emitted from the diffusion plate 10.
- the lens sheet 8 is for increasing the front luminance by condensing the light emitted from the diffusion sheet 9.
- the deflection selective reflection sheet 7 is for selectively reflecting the light emitted from the lens sheet 8 so as not to be absorbed by the deflection plate attached to the lower side of the liquid crystal display panel 3.
- the illumination device 4 converts the spot light emitted from each LED 13 into planar light by the optical sheets 7 to 9 and the diffuser plate 10, that is, eliminates the shadow (light source image) of the LED 13 and displays a liquid crystal display panel. 3 can be irradiated on the back side.
- An LED power supply board 17 for supplying power to the LED board 12 and a control board 18 for driving the liquid crystal display panel 3 are disposed on the back surface 14 c of the bottom plate 14 a of the chassis 4.
- a plurality of cooling bodies 20, a radiator 22, a tank 23, a pump 24, and pipes 25 and 26 connecting them are disposed on the back surface 14c of the bottom plate 14a of the chassis 14.
- the LED substrate 12 includes a heat sink 12a made of metal such as aluminum, and an insulating layer 12b is formed on the upper surface of the heat sink 12a.
- the heat sink 12a having a long shape has a function as a base material of the LED substrate 12 and also has a function of suppressing a temperature rise due to heat generation of the LED 13, and the heat generated by the LED 13 is generated by the chassis 14. It is fixed so as to be in surface contact (or close contact) with the housing surface 14b of the chassis 14 so as to conduct to the bottom plate 14a.
- the LED 13 has a package structure in which, for example, an LED chip 13a that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and the upper surface of the LED 13, that is, the light emitting surface 13b. It is possible to emit white light from.
- the light emitting surface 13 b of the LED 21 is arranged in parallel with the plate surface (front surface) of the LED substrate 20.
- a wiring pattern (not shown) for supplying power to each mounted LED 13 is formed on the insulating layer 12b of the LED substrate 12.
- An LED control unit 43 as shown in FIG. 8 is connected to the wiring pattern formed on the LED substrate 12.
- the LED control unit 43 is provided on the LED power supply board 17 and can individually control driving (lighting / extinguishing) of each LED 13 based on a signal input from the image signal processing unit 41. ing. Therefore, the LED control unit 43 can control individual lighting / extinguishing (non-lighting) of each LED 13 according to the mode of the image displayed on the liquid crystal display panel 2.
- the image 3a displayed on the liquid crystal display panel 3 includes a black display (dark display) region 3b and a non-black display (bright display) region 3c
- the non-black Each LED 13 that can mainly emit light to the display area 3c is turned on, while each LED 13 that can mainly emit light to the black display area 3b can be turned off (not lit). It has become.
- the difference in brightness between the black display area 3b and the non-black display area 3c of the displayed image 3a can be increased. That is, by subtracting the black color of the black display area 3b, it is possible to make the white color in the non-black display area 3c stand out more and improve the contrast ratio in the image 3a.
- the cooling body 20 disposed on the back surface 14c of the bottom plate 14a of the chassis 14 will be described. As shown in FIG. 3, the cooling body 20 is attached and fixed to the back surface 14 c of the chassis 14 via a heat conductive sheet 15 having adhesive surfaces on both sides.
- the cooling body 20 is formed in a rectangular parallelepiped shape from a metal material such as aluminum, and a plurality of flow paths 20a through which a cooling liquid flows are formed side by side.
- a liquid inflow port 20 b into which cooling liquid flows is formed at the upper end of the cooling body 20, and a liquid outflow port 20 c through which cooling liquid flows out is formed at the lower end of the cooling body 20.
- An opening is formed, and the plurality of flow paths 20a communicate with each other at the liquid inlet 20b and the liquid outlet 20c.
- the cooling body 20 includes an on-off valve 21, and the on-off valve 21 is connected to the liquid inlet 20b.
- the opening of the on-off valve 21 allows the cooling liquid in the flow path 20a to flow, and the closing operation can stop the flow of the cooling liquid in the flow path 20a.
- a supply pipe 25 is connected to the liquid inlet 20b via an on-off valve 21, and a return pipe 26 is connected to the liquid outlet 20c.
- the plurality of cooling bodies 20 are piped in parallel to the supply pipe 25 connected to the pump 24 and piped in parallel to the return pipe 26 connected to the radiator 22.
- the radiator 22 and the pump 24 are connected by piping through a tank 23.
- As the pump 24, a piston reciprocating pump for flowing a coolant is applied.
- the tank 23 is a reservoir tank for securing the amount of the coolant
- the radiator 22 is an air-cooled heat exchange that is provided with a plurality of radiating fins (not shown) so that heat can be exchanged between the coolant and the air. It is a vessel.
- a flow rate adjusting valve is used as shown in FIG. 6, and the opening degree of the ball valve 21b provided inside by a motor 21a made of a stepping motor or the like is fully opened and fully opened. Can be changed to 1/2, 1/3, 1/4, and fully closed. As a result, the flow rate of the coolant flowing through the flow path 20a of the cooling body 20 can be increased or decreased (adjusted), and the cooling performance (cooling power) of the cooling body 20 can be varied.
- the cooling body control unit 44 is connected to the motor 21 a of the on-off valve 21, and the motor 21 a is driven by a control signal output from the cooling body control unit 44. It has become.
- a cooling body control unit 44 is connected to the pump 24, and the pump 24 is driven by a control signal output from the cooling body control unit 44.
- the pump 24 starts an operation of sending the coolant to the supply pipe 25 when a control signal is input from any of the plurality of cooling body controllers 44 shown in FIG. Note that the pump 24 and the radiator 22 are bypassed via the bypass pipe 27 so that the coolant can be sent out by the pump 24 even when all the on-off valves 21 provided in each cooling body 20 are closed. Are connected (see FIGS. 1 and 5).
- the cooling body control unit 44 is connected to the LED control unit 43, and operates the motor 21 a in conjunction with the LED control unit 43 driving (turning on / off) the LED 13. It is possible to drive.
- such a cooling body 20 is arranged in a matrix in the vertical and horizontal directions (X direction and Y direction) on the back surface 14 c of the chassis 14. Moreover, the cooling body 20 is arrange
- the cooling body 20 is disposed in a region between the LEDs 13 and 13 adjacent to each other in the vertical direction (Y direction), whereas in the horizontal direction. Every other LED is intermittently arranged in the region between the adjacent LEDs 13 in the (X direction).
- the cooling body 20 is arranged in association with four LEDs 13, 13, 13, 13 arranged two by two in the vertical direction (Y direction) and the horizontal direction (X direction), and the center thereof is associated with each other.
- the four LEDs 13, 13, 13, 13 are arranged so as to be substantially equidistant.
- FIG. 7 a total of 12 LEDs 13 arranged in the vertical direction (Y direction) and 4 in the horizontal direction (X direction) are associated with these LEDs 13.
- the four cooling bodies 20 will be taken up and described.
- the three LEDs 13 forming the rightmost column are the first LED 13A, the second LED 13B, and the third LED 13C in order from the top
- the three LEDs 13 forming the left column are the fourth LED 13D and the fifth LED 13E in order from the top.
- the sixth LED 13F, the three LEDs 13 forming the left column are the seventh LED 13G, the eighth LED 13H, and the ninth LED 13I from the top
- the three LEDs 13 forming the left column are the tenth LED 13J and the eleventh LED 13K from the top.
- the twelfth LED 13L The subscripts A to L are added to the reference numerals when distinguishing the LEDs 13, and the subscripts are not attached to the reference signs when collectively referring to them without distinction.
- Each LED group 30 is composed of four LEDs 13 adjacent in the vertical direction (Y direction) and the horizontal direction (X direction).
- the upper right four LEDs 13 (first LED 13A, second LED 13B, fourth LED 13D, fifth LED 13E) shown in FIG. 7 constitute the first LED group 30A
- the lower right four LEDs 13 (second LED 13B, 3LED13C, 5th LED13E, 6th LED13F) constitutes the 2nd LED group 30B
- 4 LED13 (7th LED13G, 8th LED13H, 10th LED13J, 11th LED13K) on the upper left of the figure constitutes the 3rd LED group 30C
- Four LEDs 13 (8th LED 13H, 9th LED 13I, 11th LED 13K, 12th LED 13L) constitute 4th LED group 30D.
- the subscripts A to D are attached to the reference numerals when distinguishing the LED groups 30, and the subscripts are not attached to the reference signs when referring collectively without distinction.
- the second LED 13B and the fifth LED 13E are included in both the first LED group 30A and the second LED group 30B, whereas the first LED 13A and the fourth LED 13D are included only in the first LED group 30A, and the third LED 13C and The sixth LED 13F is included only in the second LED group 30B.
- the eighth LED 13H and the eleventh LED 13K are included in both the third LED group 30C and the fourth LED group 30D, whereas the seventh LED 13G and the tenth LED 13J are included only in the third LED group 30C, and the ninth LED 13I and The twelfth LED 13L is included only in the fourth LED group 30D.
- each LED group 30 is associated with a cooling body 20 located approximately in the center of each LED group 30.
- the first cooling body 20A is located approximately in the center of the first LED group 30A
- the second cooling body 20B is located approximately in the center of the second LED group 30B
- the third LED group 30C is the third cooling body 20C
- what is positioned approximately in the center of the fourth LED group 30D is the fourth cooling body 20D.
- the subscripts A to D are added to the reference numerals when distinguishing the cooling bodies 20, and the subscripts are not attached to the reference numerals when collectively referring to them without distinction.
- the four power lines 32 connected to each of the LEDs 13 (the first LED 13A, the second LED 13B, the fourth LED 13D, and the fifth LED 13E) constituting the first LED group 30A open and close the first cooling body 20A.
- the cooling body control unit 44 that drives the valve 21a is connected in parallel via a diode D and a resistor R. Therefore, when any one of the LEDs 13 constituting the first LED group 30A is driven, the on-off valve 21a of the first cooling body 20A is driven by the cooling body control unit 44 in conjunction with the driving, and the first cooling body 20A is driven. Cooling by is performed.
- the four power lines 32 connected to each of the LEDs 13 (second LED 13B, third LED 13C, fifth LED 13E, sixth LED 13F) constituting the second LED group 30B are cooling for driving the on-off valve 21a of the second cooling body 20A.
- the body controller 44 is connected in parallel via a diode D and a resistor R. Therefore, when any one of the second LED groups 30 is driven, the on-off valve 21a of the second cooling body 20B is driven by the cooling body control unit 44 in conjunction with the driving, and cooling by the second cooling body 20B is performed. It has come to be.
- any one of the LEDs 13 constituting the LED group 30 is driven, and accordingly, the third cooling body 20C and the fourth cooling body 20D are linked. Cooling is performed.
- the second LED 13B and the fifth LED 13E are included in both the first LED group 30A and the second LED group 30B, when either the second LED 13B or the fifth LED 13E is driven,
- the on-off valves 21a and 21a of both the first cooling body 20A and the second cooling body 20B are driven by the cooling body control units 44 and 44 so that the cooling by the first cooling body 20A and the second cooling body 20B is performed.
- the eighth LED 13H and the eleventh LED 13K are redundantly included in both the third LED group 30C and the fourth LED group 30D.
- the flow regulating valve is used as the on-off valve 21a, when a plurality of LEDs 13 are associated with one cooling body 20, according to the number of LEDs 13 that are lit,
- the on-off valve (flow rate adjusting valve) 21a adjusts the flow rate of the coolant flowing through the cooling body 20, whereby the cooling performance (cooling power) of the cooling body 20 can be varied.
- the LED 13 is associated with the first LED group 30A.
- the cooling body control unit 44 can drive the opening / closing valve 21a so that the opening / closing valve (flow rate adjusting valve) 21a of the first cooling body 20A is opened at a 1/4 degree of opening relative to the full opening.
- the cooling body control unit 44 can drive the opening / closing valve 21a so that the opening / closing valve (flow rate adjusting valve) 21a of the first cooling body 20A is opened at an opening of 1/2.
- the cooling body control unit 44 can drive the opening / closing valve 21a so that the opening / closing valve (flow rate adjusting valve) 21a of the first cooling body 20A is opened at an opening of 3/4 with respect to the full opening.
- the first cooling body associated with the first LED group 30A can drive the on-off valve 21a so that the 20A on-off valve (flow rate adjusting valve) 21a is fully opened.
- the first cooling body 20A associated with the first LED group 30A can drive the on-off valve 21a so as to fully close the on-off valve (flow rate adjusting valve) 21a.
- the flow rate of the coolant flowing through the cooling body 20 associated with the LED 13 is increased accordingly. It is also possible to actively cool the LED 13 that has generated more heat as its brightness is increased.
- the flow rate of the coolant flowing through the cooling body 20 can be increased or decreased in accordance with the number of LEDs 13 to be lit among the plurality of LEDs 13 thus associated and the brightness of the LEDs 13 being increased, the generated LEDs 13 can be efficiently removed. It can be cooled. Further, since the temperature rise of the coolant can be suppressed, the coolant can be sufficiently cooled by the radiator 22.
- the LED control unit 43 individually controls the driving (lighting / extinguishing) of each LED 13 based on the signal input from the image signal processing unit 41. For example, as shown in FIG. 10, when the image 3a displayed on the liquid crystal display panel 3 includes a black display (dark display) region 3b and a non-black display (bright display) region 3c, non-black display is performed. While turning on each LED 13 arranged to irradiate mainly light to the area 3c (specifically, arranged so as to overlap with the non-black display area 3c in plan view), the black display area 3b Thus, it is possible to turn off (not illuminate) each LED 13 that is arranged to emit mainly light (specifically, arranged so as to overlap with the black display region 3b in plan view).
- the LED control unit 43 controls the turning on / off of each LED 13 in accordance with the mode of the image 3a displayed on the liquid crystal display panel 3, so that the black display area 3b and the non-black display area 3c are controlled.
- the difference in brightness can be increased, the contrast ratio in the image 3a can be improved, and the cooling body control unit 44 operates the cooling body 20 associated with the lit LED 13, while the light is turned off ( By controlling so as not to operate the cooling body 20 associated with the LED 13 that is not lit), the LED 13 that needs to be cooled can be efficiently cooled, and the utilization efficiency of the coolant can be improved. Can be done.
- the LED control unit 43 controls the driving (lighting / extinguishing) of the plurality of LEDs 13, and the cooling body control unit 44 controls the associated cooling bodies 20 based on the driving of the LEDs 13. It is possible to control the driving of the on-off valve 21a, that is, the cooling operation of the LED 13 due to the flow of the coolant through the cooling body 20. Therefore, for example, the on / off valve of the cooling body 20 associated with the lit LED 13 is driven to cool the LED 13 by the cooling body 20, and the on / off valve of the cooling body 20 associated with the unlit LED 13. It is possible to control that the LED 13 is not cooled by the cooling body 20 without driving the 21a.
- the cooling body 20 by selectively operating the cooling body 20, it is possible to selectively cool the LEDs 13 that have generated heat due to lighting, and temporarily turn off all the LEDs 13 provided in the lighting device. Regardless of this, the LED 13 that needs to be cooled can be efficiently cooled and the early deterioration of the coolant can be prevented as compared with the case where the entire LED 13 is cooled. This prevents a decrease in cooling performance due to early deterioration of the coolant, and improves the utilization efficiency of the coolant.
- the cooling body 20 is arrange
- the on-off valve 21 of the cooling body 20 is a flow rate adjusting valve, and is controlled by the cooling body control unit 44 so as to increase or decrease the flow rate of the coolant flowing through the cooling body 20 according to the driving of the associated LED 13. Therefore, for example, when a plurality of LEDs 13 are associated with one cooling body 20, the flow rate of the coolant flowing through the cooling body 20 is changed according to the number of lit LEDs 13.
- the cooling performance (cooling power) of the cooling body 20 can be varied. Specifically, for example, in the case where four LEDs 13 are associated with one cooling body 20, when the number of lit LEDs 13 is one, the on-off valve 21 fully opens the valve 21b.
- the on-off valve 21 opens the valve 21b at an opening of 3/4 with respect to full opening. Is possible. Further, when the current flowing through the LED 13 is increased in order to increase the brightness of the LED 13 than usual, the flow rate of the coolant flowing through the cooling body 20 is increased accordingly, and the brightness is increased accordingly. Accordingly, it is possible to actively cool the LED 13 that has generated more heat.
- the flow rate of the coolant flowing through the cooling body 20 can be increased / decreased according to the number of the LEDs 13 to be lit up and the brightness of the LEDs 13 increased, it is possible to efficiently cool the heated LED 13. is there. Further, since the temperature rise of the coolant can be suppressed, the coolant can be sufficiently cooled by the radiator 22.
- the cooling body 20 is disposed on the back surface 14c on the opposite side of the housing surface 14b of the chassis 14, the vicinity of the cooling body 20 in the chassis 14 is cooled. Therefore, the cooling body 20 in the chassis 14 is cooled. The LED 13 is indirectly cooled through the vicinity. Further, since the LED 13 and the cooling body 20 do not exist on the same side with respect to the chassis 14, it is easy to install the LED 13 and the cooling body 20. Furthermore, since the cooling body 20 is disposed with the heat conductive sheet 15 interposed on the back surface 14 c of the chassis 14, the heated LED 13 can be efficiently cooled by the cooling body 20.
- the display panel 3 which has the area
- an image signal processing unit 41 that processes a signal related to an image
- a display panel control unit 42 that controls driving of the display panel 3 based on an output signal from the image signal processing unit 41
- the LED control unit 43 and the cooling body control unit 44 are configured to control the driving of the on-off valve 21 of the LED 13 and the cooling body 20 based on the output signal from the image signal processing unit 41.
- the LED control unit 43 controls the driving of the LED 13 based on the output signal from the image signal processing unit 41, for example, as shown in FIG. While the LED 13 corresponding to a region other than the black display region 3b (non-black display region 3c) is turned on in the image 3a displayed at, the LED 13 corresponding to the black display region 3b can be turned off (not lit). Thereby, the contrast characteristic in the image 3a can be improved.
- the cooling body control unit 44 controls the operation of the cooling body 20 by the cooling body control unit 44 based on the output signal from the image signal processing unit 41, while operating the cooling body 20 associated with the lit LED 13, By not operating the cooling body 20 associated with the LED 13 that is turned off (non-lighted), the LED 13 that needs to be cooled can be efficiently cooled, and the utilization efficiency of the coolant can also be improved.
- the configuration in which one cooling body 20 is associated with four LEDs 13 has been described.
- the configuration in which one cooling body 20 is associated with one LED 13 or 2 A configuration in which one cooling body 20 is associated with one LED 13 or a configuration in which one cooling body 20 is associated with five or more LEDs 13 may be used.
- the configuration in which the cooling body 20 is disposed on the back surface 14c of the bottom plate 14a of the chassis 14 opposite to the housing surface 14a has been described, but the configuration in which the cooling body 20 is disposed on the housing surface 14a of the chassis 14, that is, the LED board 12
- the structure which affixed the cooling body 20 on the back surface of this may be sufficient.
- the number of pumps 24 for supplying the coolant to each cooling body 20 and the number of radiators 22 for cooling the coolant returned from each cooling body 20 are not limited to one as in the above-described embodiment. Alternatively, a configuration may be provided in which a plurality of each is provided.
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- General Engineering & Computer Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
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Abstract
Description
Claims (10)
- 複数個のLEDと、該複数個のLEDが縦横に配置される収容面を有するシャーシと、該シャーシにおいて前記LEDの配置に対応付けた位置にそれぞれ配置され、内部に冷却液の流れる流路と該流路を開閉するための開閉弁を有する複数の冷却体と、前記冷却液と空気との間で熱交換を行うラジエータと、前記冷却体と前記ラジエータに配管接続され、前記冷却液を循環させるポンプと、前記LEDの駆動を制御するLED制御部と、前記LEDの駆動に基づき該LEDに対応付けられた前記冷却体の開閉弁の駆動を制御する冷却体制御部とを備えることを特徴とする照明装置。
- 前記各冷却体のそれぞれに対して、前記LEDが複数個ずつ対応付けられていることを特徴とする請求項1に記載の照明装置。
- 前記冷却体は、隣り合うLED間の略中央位置に配置されていることを特徴とする請求項1または2に記載の照明装置。
- 前記冷却体の開閉弁は、流量調整弁であり、対応付けられた前記LEDの駆動に応じて該冷却体に流れる冷却液の流量を増減するように前記冷却体制御部によって制御されることを特徴とする請求項1から3のいずれか一項に記載の照明装置。
- 前記冷却体は、前記シャーシの収容面とは反対側の背面に配置されていることを特徴とする請求項1から4のいずれか一項に記載の照明装置。
- 前記冷却体は、前記シャーシの背面に熱伝導シートを介在させて配置されていることを特徴とする請求項5に記載の照明装置。
- 画像の表示を行う領域を有する表示パネルと、該表示パネルの背面側に配置される請求項1から6のいずれか一項に記載の照明装置とを備えていることを特徴とする表示装置。
- 前記画像に係る信号を処理する画像信号処理部と、該画像信号処理部からの出力信号に基づき前記表示パネルの駆動を制御する表示パネル制御部とを備え、前記LED制御部および前記冷却体制御部は、前記画像信号処理部からの出力信号に基づき前記LEDおよび前記冷却体の開閉弁の駆動を制御するようにしたことを特徴とする請求項7に記載の表示装置。
- 前記表示パネルは、一対の基板間に液晶を封止してなる液晶表示パネルであることを特徴とする請求項7または8に記載の表示装置。
- 請求項7から9のいずれか一項に記載の表示装置を備えていることを特徴とするテレビ受信装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800620714A CN102713428A (zh) | 2010-01-25 | 2010-11-16 | 照明装置、显示装置以及电视接收装置 |
EP10843942.3A EP2530376A4 (en) | 2010-01-25 | 2010-11-16 | LIGHTING DEVICE, DISPLAY DEVICE, AND TELEVISION RECEPTION DEVICE |
JP2011550799A JP5306484B2 (ja) | 2010-01-25 | 2010-11-16 | 照明装置、表示装置およびテレビ受信装置 |
US13/522,532 US8864335B2 (en) | 2010-01-25 | 2010-11-16 | Illuminating device, display device, and television receiving device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2010013342 | 2010-01-25 | ||
JP2010-013342 | 2010-01-25 |
Publications (1)
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WO2011089778A1 true WO2011089778A1 (ja) | 2011-07-28 |
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PCT/JP2010/070343 WO2011089778A1 (ja) | 2010-01-25 | 2010-11-16 | 照明装置、表示装置およびテレビ受信装置 |
Country Status (5)
Country | Link |
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US (1) | US8864335B2 (ja) |
EP (1) | EP2530376A4 (ja) |
JP (1) | JP5306484B2 (ja) |
CN (1) | CN102713428A (ja) |
WO (1) | WO2011089778A1 (ja) |
Cited By (1)
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WO2020065713A1 (ja) * | 2018-09-25 | 2020-04-02 | 堺ディスプレイプロダクト株式会社 | 液晶表示装置 |
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KR101239135B1 (ko) * | 2009-03-05 | 2013-03-11 | 샤프 가부시키가이샤 | 발광 모듈, 발광 모듈 유닛 및 백라이트 시스템 |
CN104197298A (zh) * | 2014-02-21 | 2014-12-10 | 浙江吉利控股集团有限公司 | 汽车大灯外壳密封结构 |
CN103925527A (zh) * | 2014-04-28 | 2014-07-16 | 江苏达伦电子股份有限公司 | 屏式模组化led照明系统 |
CN204084274U (zh) * | 2014-07-30 | 2015-01-07 | 深圳Tcl新技术有限公司 | 散热器、背光模组及显示模组 |
DE102016224064A1 (de) * | 2016-12-02 | 2018-06-07 | Eaton Protection Systems Ip Gmbh & Co. Kg | Elektrisches/Elektronisches Betriebsmittel, Verfahren zur Kühlung und Überwachung des Betriebsmittels sowie Sicherheitsschalteinrichtung |
EP3385782A1 (en) * | 2017-04-07 | 2018-10-10 | PowerView Display Corporation | Lcd display device |
EP3477627A1 (en) * | 2017-10-26 | 2019-05-01 | Vestel Elektronik Sanayi ve Ticaret A.S. | Display device and method of operation |
JP2019120874A (ja) * | 2018-01-10 | 2019-07-22 | シャープ株式会社 | 表示装置 |
CN110780483A (zh) * | 2019-10-09 | 2020-02-11 | 深圳市华星光电技术有限公司 | 背光源散热装置及显示装置 |
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- 2010-11-16 CN CN2010800620714A patent/CN102713428A/zh active Pending
- 2010-11-16 EP EP10843942.3A patent/EP2530376A4/en not_active Withdrawn
- 2010-11-16 JP JP2011550799A patent/JP5306484B2/ja not_active Expired - Fee Related
- 2010-11-16 WO PCT/JP2010/070343 patent/WO2011089778A1/ja active Application Filing
- 2010-11-16 US US13/522,532 patent/US8864335B2/en not_active Expired - Fee Related
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CN112823310A (zh) * | 2018-09-25 | 2021-05-18 | 堺显示器制品株式会社 | 液晶显示装置 |
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Also Published As
Publication number | Publication date |
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US8864335B2 (en) | 2014-10-21 |
JP5306484B2 (ja) | 2013-10-02 |
JPWO2011089778A1 (ja) | 2013-05-20 |
EP2530376A1 (en) | 2012-12-05 |
EP2530376A4 (en) | 2013-11-27 |
CN102713428A (zh) | 2012-10-03 |
US20120293535A1 (en) | 2012-11-22 |
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