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Light-diffusion plate

A technology of diffusing plate and diffusing agent, applied in the field of diffusing plate, can solve the problems of reduced absorption capacity, lack of light resistance of resin, color deterioration and so on

Inactive Publication Date: 2008-01-16
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems, some patents disclose multi-layer boards containing methyl methacrylate-styrene resin that can reduce the absorption capacity (Japanese Patent Application Laid-Open No. 2004-37483, Korean Patent Laid-Open No. 2003-95262), but the above-mentioned patents use The resin itself lacks sufficient light resistance, and it is prone to deterioration such as coloring in certain working environments
One of the known methods for improving the light resistance of resins is to add ultraviolet absorbers, but the effect cannot be fully exhibited when the light resistance of the resin is low

Method used

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Embodiment Construction

[0025] The present invention will be further described below.

[0026] The base material layer of the present invention may use only polycarbonate resin as its base resin, or it may be used by mixing polycarbonate resin and polystyrene resin.

[0027] Polycarbonate resin has good impact resistance, light transmittance, cold resistance and electrical properties. Its excellent heat resistance and absorption resistance can greatly improve dimensional stability and expand the range of working temperature. It is suitable for optical lenses and optical discs Materials, safety helmets, protective gear and cumulative covers, etc.

[0028] The polycarbonate resin used in the present invention is a commonly used aromatic polycarbonate resin, including linear and branched carbonates made by reacting hydroxyphenol with phosgene or reacting hydroxyphenol with a carbonate precursor. Polymer (carbonate homopolymer) and polyester copolymer or a mixture of more than one of the above products....

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Abstract

Disclosed is a light-diffusion plate for use in a backlight unit of a liquid crystal display or an illumination apparatus. Specifically, this invention provides a light-diffusion plate including a substrate layer composed mainly of a first base resin; and a surface layer composed mainly of fluorine resin formed on either or both surfaces of the substrate layer. Thus, such a light-diffusion plate exhibits high dimensional stability thanks to high heat resistance and moisture resistance, and seldom causes a bending phenomenon even under conditions of high temperature and high humidity. Further, the light-diffusion plate has excellent light properties including total luminous transmittance, and also has a low yellowing index even upon exposure to a light source for a long period of time.

Description

technical field [0001] The invention relates to a light-diffusion plate suitable for liquid crystal display screen backlight modules or lighting devices. Background technique [0002] Existing disclosed diffuser plates include: 1. a diffuser plate with concave-convex shape processed on the surface (Japanese Patent Application Laid-open No. 4-275501); Diffusion layer is made into diffusion plate (Japanese Patent Application Publication Flat 6-59108); ③ the particles are melt-mixed into transparent resin and extruded to make diffusion plate (Japanese Patent Application Publication Flat 6-123802); ④ Melt and knead two or more transparent thermoplastic resins to produce a diffuser plate with a sea-island structure (Japanese Patent Application Publication Hei 9-311205) and the like. [0003] The above-mentioned diffusion plates of ① and ② are surface diffusion plates that obtain a diffusion effect by the concave-convex shape on the surface or by coating a diffusion layer. The d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02C08J7/04G02F1/13357G02F1/1335
CPCA44C5/003A45C11/00A45C2011/002A45F2005/008A45F2200/0516
Inventor 杜俊吉赵允熹李羲政金东贤韩秉熙柳太镛姜忠锡
Owner KOLON IND INC
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