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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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 temperature is 50°C. As the surrounding temperature of the LED rises, the lifespan will become shorter.
[0016] In addition, the heat generated in the LED can also cause damage to the wiring of the LED or the mounting substrate on which the LED is mounted.
[0017] In addition, in order to achieve higher brightness of the backlight, if the number of LEDs installed increases, the amount of heat generated will increase, so it cannot be ignored further.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0246] With regard to the thermally conductive elastic sheet 31, an elastic sheet (the model produced by Japan Sumitomo Slim (Co., Ltd.) is No.5509) with a cross-section having heat dissipation properties that can be used is No.5509. As for the heat dissipation substrate 5, a thickness of 2 mm of 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 various materials used here is 0.45W / m·k for the mounting substrate 21 composed of glass epoxy resin, 5W / m·k for the thermally conductive elastic sheet 31, and 236W / m·k for the aluminum used as the heat dissipation substrate 5. k.

[0248] In addition, magnesium or iron may be used as the heat dissipation substrate 5 . In addition, the thermal conductivity of magnesium is 157W / m·k, and the thermal conductivity of iron is 83.5W / m·k. If the heat dissipation is poor, it is also possible to increase the thi...

Embodiment 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 , the fluid 17 (thermally conductive compound) was applied, and the same temperature measurement as in Example 1 was performed.

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

[0258] Heat conduction compound is a clay-like state in which fine ceramic particles with high thermal conductivity, etc., are mixed with a high-viscosity oil component. , so that the thermal conductivity becomes better.

[0259] Using a liquid crystal display 1 with a display area size of 4.7 inches, 16 LED light sources 2 are arranged and...

Embodiment 3

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

[0265] The thermally conductive elastic member 20 can use a plate-shaped elastic sheet (model No.5509 produced by Japan Sumitomo Slim (Co., Ltd.)) with heat dissipation characteristics, so that the light incident side end surface of the mounting substrate 21 and the light guide plate 3 is a surface. fixed by contact.

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

[0267] Using a liquid crystal di...

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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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