Liquid crystal display device

A liquid crystal display device and liquid crystal display technology, which are applied to identification devices, lighting devices, cooling/heating devices of lighting devices, etc., can solve the problems of low luminous efficiency and lifespan of LED light sources, increased heat generation, and shortened lifespan. , to achieve the effect of inhibiting the reduction of luminous efficiency, reducing the temperature rise, and preventing damage to the LED light source

Active Publication Date: 2006-01-04
KYOCERA CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] As one of the problems, there is a problem that the temperature of the LED light source and its surroundings increases due to the heat generation of the LED light source, resulting in a decrease in the luminous efficiency and life of the LED light source.
from Figure 25 It can be seen that when the ambient temperature is 25°C, the lifespan is about 12,000 hours. In contrast, it is only about 5,500 hours when the ambient temperatu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0245] (Example 1)

[0246] As for the thermally conductive elastic sheet 31, an L-shaped elastic sheet with heat dissipation characteristics (model No. 5509 produced by Sumitomo Serie Co., Ltd.) can be used. For the heat dissipation substrate 5, the thickness can be used 2mm aluminum, the mounting substrate 21, the thermally conductive elastic sheet 31, and the heat dissipation substrate 5 are fixed in surface contact.

[0247] The thermal conductivity of the various materials used here is 0.45 W / m·k for the mounting substrate 21 made of glass epoxy resin, 5 W / m·k for the thermally conductive elastic sheet 31, and 236 W / m·k for aluminum as the heat sink substrate 5 k.

[0248] In addition, as the heat dissipation substrate 5, magnesium or iron may be used. In addition, the thermal conductivity of magnesium is 157 W / m·k, and the thermal conductivity of iron is 83.5 W / m·k. In the case of poor heat dissipation, the thickness of the plate may be increased or a heat sink may be provid...

Example Embodiment

[0255] (Example 2)

[0256] Between the mounting substrate 21 and the thermally conductive elastic sheet 31, and between the thermally conductive elastic sheet 31 and the heat dissipation substrate 5, a fluid 17 (thermally conductive compound) is applied, and the same temperature measurement as in Example 1 is performed.

[0257] As for the thermal conductive compound, the SC102 manufactured by Toray, Japan, Silicon Co., Ltd. can be used, and the mounting substrate 21, the thermally conductive elastic sheet 31 and the heat dissipation substrate 5 are fixed in surface contact. The thermal conductivity of the thermally conductive composite is 0.8W / mk.

[0258] The thermally conductive compound is a clay-like state in which fine ceramic particles with high thermal conductivity are mixed with high-viscosity oil and fat components, and the oil and fat components contained in it correspond to and bond with the small irregularities, and at the same time, the ceramic particles with high t...

Example Embodiment

[0263] (Example 3)

[0264] In addition to the structure of Example 1, a thermally conductive elastic member 20 was added, and the same temperature measurement as in Example 1 was performed.

[0265] For the thermally conductive elastic member 20, a plate-shaped elastic sheet with heat dissipation characteristics (model No. 5509 produced by Sumitomo Serie Co., Ltd., Japan) can be used to make the mounting substrate 21 and the light-incident side end surface of the light guide plate 3 face. Touch and fix.

[0266] The light emitted by the LED light source 2 and the heat generated at the same time are also released to the light guide plate 3 through the mounting substrate 21 and the thermally conductive elastic member 20. Therefore, the heat transferred from the mounting substrate 21 to the heat dissipation substrate 5 is radiated from the three lines of the mounting surface and the back surface of the mounting substrate 21 and the lower end surface.

[0267] Using a 4.7-inch liquid...

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Abstract

The present invention provides a liquid crystal display device and a light source device, wherein the light source device is provided with a backlight source and a heat dissipation substrate for transferring the heat from the backlight source. The backlight source comprises the following components: a light conducting plate, an LED light source configured on the end plane of light conducting plate; and an installation substrate which is installed with the LED light source and has insulation property. A heat-conducting elastic sheet is provided between the installation substrate and the heat dissipation substrate.

Description

technical field [0001] The invention relates to a liquid crystal display device with a liquid crystal display screen and a backlight source, in particular to a liquid crystal display device using a light emitting diode (hereinafter referred to as LED) as a light source. Background technique [0002] Conventionally, among the display methods of liquid crystal display devices, transmissive or semi-transmissive liquid crystal display devices are configured by disposing a liquid crystal display and a backlight for supplying transmitted light to the liquid crystal display. [0003] Generally, a backlight is composed of a light source and a light guide plate, and a small fluorescent tube called a CCFL (cold cathode tube) is used as a light source. And, let one main surface of the light guide plate face in a manner corresponding to the display area of ​​the liquid crystal display panel, and on the one main surface and the opposite main surface (referred to as the outer surface), a ...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02F1/133G09F9/35F21V29/00H01L33/56H01L33/60
CPCH01L2924/0002
Inventor 近藤久雄土田克己
Owner KYOCERA CORP
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