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Light diffusing plate

A technology of light diffusion plate and light diffusion agent, which is applied in the direction of optics, electric light sources, optical components, etc., and can solve the problems of blackening and weakening of the screen

Inactive Publication Date: 2006-05-03
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the light-diffusing property of the light-diffusing plate works excessively, the transmitted light becomes weak so that the screen becomes black, which is difficult to solve

Method used

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  • Light diffusing plate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0075] By adding 1.01 parts by weight of silicone resin-based cross-linked beads having an average particle diameter of 2 μm [manufactured by GE Toshiba Silicones; trade name: TOSPEARL 120 (registered trademark)] to 100 parts by weight of acrylic resin [manufactured by Asahi Kasei Corporation; trade name : DELPETLP-1 (registered trademark)] was used as a diffusing agent to prepare the base material layer resin (A).

[0076] By adding 5.26 parts by weight of talc [manufactured by Nippon Talc Co., Ltd.; trade name: NTX (registered trademark)] having an average particle diameter of 15 μm to 100 parts by weight of acrylic resin [manufactured by Asahi Kasei Corporation; trade name: DELPET LP -1 (registered trademark)] was used as a diffusing agent to prepare the coating layer resin (B).

[0077] By using a tablet extruder (manufactured by Plabor Co., Ltd.), a polishing roll, and two extruders each having a screw diameter of 60 mm and 25 mm (Pla Giken Co., Ltd.) manufactured; produ...

example 2

[0086] A light-diffusing plate was prepared in the same manner as in Example 1, except that the amount of talc contained in the coating layer resin (B) was changed to 8.70 parts by weight. The weight of the light-diffusing agent contained in the light-diffusing plate of this example corresponds to 1.21% by weight relative to the weight of the entire light-diffusing plate. The results are shown in Table 1.

example 3

[0088] A light-diffusing plate was prepared in the same manner as in Example 1, except that the amount of talc contained in the coating layer resin (B) was changed to 11.11 parts by weight. The weight of the light-diffusing agent contained in the light-diffusing plate of this example corresponds to 1.27% by weight relative to the weight of the entire light-diffusing plate. The results are shown in Table 1.

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Abstract

The present invention provides a light-diffusing plate comprising: a light-transmitting thermoplastic resin; and a light-diffusing agent, wherein the light-diffusing agent is contained in an amount of 0.2 to 10% by weight relative to the total weight of the light-diffusing plate, Wherein the luminance of at least one surface of the light diffusion plate is 20 to 70%. The present invention can provide a light-diffusing plate used in a direct type backlight device, which can realize higher luminance than that obtained by a conventional light-diffusing plate.

Description

technical field [0001] The present invention relates to a light diffusion plate used in a direct type backlight unit. Background technique [0002] In recent years, LCD TVs have attracted domestic and international attention as home TVs of the 21st century, and demand for them is expected to continue to grow in the future. [0003] Liquid crystals are not light-emitting devices like cathode ray tubes used in conventional televisions, and a planar light source device called a backlight device needs to be arranged behind the liquid crystals. [0004] There are generally two types of backlight devices. One of them is the so-called edge-lit or side-lit backlight, which has a linear light source, usually a cold-cathode tube, arranged next to the optical waveguide. Another type is a direct type backlight device in which a light diffusing sheet called a light diffusing plate is arranged in front of a linear light source. [0005] Edge-light type backlight devices are widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02F21S2/00F21V3/04G02F1/1335
CPCF21V3/04G02B5/0242G02B5/0278G02B5/02
Inventor 宫内雅弘
Owner ASAHI KASEI CHEM CORP