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Backlight and liquid crystal display device

A technology of backlight and light source, which is applied in the field of backlight, can solve the problems of uneven color, low thermal conductivity, and insufficient diffusion of liquid crystal display devices, and achieve the effect of improving display performance

Inactive Publication Date: 2011-08-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the illuminating device disclosed in JP-A-2004-302067, since the reflector is made of white PET with low thermal conductivity, the heat generated by the LED cannot be sufficiently diffused, resulting in uneven temperature.
Uneven temperature affects the optical film or glass plate of the liquid crystal display panel, and the liquid crystal display device produces uneven color.

Method used

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  • Backlight and liquid crystal display device
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  • Backlight and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0242] Preparation examples and examples are shown below, and the present invention will be described more specifically, but the present invention is not limited to these examples.

[0243] (Preparation of thermally conductive sheet)

preparation example 1

[0245] 13.42 g of PT-110 (trade name, plate-shaped boron nitride particles, average particle diameter (light scattering method) 45 μm, manufactured by Momentive Performance Materials Japan), 1.0 g of JER828 (trade name, bisphenol A ring Oxygen resin, the first epoxy resin, liquid, epoxy equivalent 184~194g / eqiv., softening temperature (ring and ball method) is less than 25 ℃, melt viscosity (80 ℃) 70mPa·s, Japan epoxy resin company (パパンエキポキシ Resin Co., Ltd.), and 2.0 g of EPPN-501HY (trade name, triphenylmethane type epoxy resin, second epoxy resin, solid, epoxy equivalent 163 to 175 g / eqiv., softening temperature (ring and ball method) 57 ~63°C, manufactured by Nippon Kayaku Co., Ltd.), 3g (solid content 0.15g) (accounting for 5% by mass relative to the total amount of JER828 and EPPN-501H of epoxy resin) curing agent (Curezol2P4MHZ-PW (trade name, Shikoku Kasei) 5% by mass methyl ethyl ketone dispersion (manufactured by the company) was mixed and stirred, and left overnight a...

preparation example 2～16

[0252] Based on the compounding ratios and production conditions in Tables 1 to 3, thermally conductive sheets (Preparation Examples 2 to 16) were obtained in the same manner as in Preparation Example 1 (see image 3 ).

[0253] (manufacturing of backlight)

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Abstract

The invention provides a backlight and a liquid crystal display device. The backlight comprises an irradiation part for irradiating a liquid crystal panel with light, and a thermal diffusion component contacting the irradiation part. The thermal diffusion component is composed of plate-like thermally conductive sheets which contain boron nitride particles. The thermal conductivity of the thermally conductive sheet in a direction orthogonal to the thickness direction is above 4 W / m.K.

Description

technical field [0001] The present invention relates to a backlight and a liquid crystal display device. Specifically, it relates to a liquid crystal display device suitable for use in televisions and the like, and a backlight used for the liquid crystal display device. Background technique [0002] Conventionally, a liquid crystal display device has a liquid crystal panel and a backlight for irradiating light to the liquid crystal panel. A direct type backlight is known as a backlight for a liquid crystal display device used in a television or the like. The direct type backlight has an LED (Light Emitting Diode) or a CCFL (Cold Cathode Fluorescent Lamp), and a reflector arranged behind it. [0003] As the above-mentioned backlight, for example, a direct-type lighting device has been proposed, which has a plurality of LEDs and is arranged opposite to the LEDs behind the plurality of LEDs, and is made of white PET (polyethylene terephthalate). ethylene glycol formate) (for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V29/00F21V17/00F21V7/00G02F1/13357
CPCG02F2001/133628G02F1/1336G02F1/133628G02B6/0055G02B6/0073G02F1/133524G02F1/133602
Inventor 泉谷诚治原和孝福冈孝博内山寿惠平野仁嗣
Owner NITTO DENKO CORP
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