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Light scattering plate and liguid crystal display using the same

A liquid crystal display, light scattering technology, used in instruments, optics, diffusing components, etc., can solve problems such as unevenness, hardness damage of inorganic materials, etc.

Active Publication Date: 2005-03-09
HB TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] However, in the light-diffusing sheet disclosed in the above-mentioned Japanese patent, there is a problem that uneven spots appear when light is transmitted or scattered through the light-diffusing sheet due to agglomeration of large and small particles in the resin composition.
[0009] Also, in the case of using inorganic particles as the light-scattering agent, the inorganic particles are not uniformly blended into the matrix of the thermoplastic resin composition, and equipment for preparing the light-scattering sheet such as a mold line can be damaged due to the rigidity of the inorganic material.

Method used

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Examples

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Embodiment 1A-1D

[0046] 95% by weight of methyl methacrylate and 5% by weight of methyl acrylate were copolymerized to prepare a transparent thermoplastic resin. To this thermoplastic resin was added 1, 3, 5 and 7% by weight of polycarbonate having a viscosity average molecular weight of about 30,000 as a light scattering agent to prepare four resin compositions 1A to 1D. The four resin compositions were heated and melted, and molded in a 6"x6" square mold to obtain four kinds of light-diffusing plates with a thickness of 1 / 6".

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PUM

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Abstract

A light diffuser plate for liquid crystal displays according to the present invention is prepared with a thermoplastic resin composition comprising (A) a matrix selected from the group consisting of methacrylic resin, styrenic resin, cyclic olefinic resin, polyester resin, and a mixture thereof, and (B) a polycarbonate resin admixed in the matrix as a light diffusing agent. The amount of polycarbonate resin (B) is about 0.01~20% by weight based on the weight of the plate and preferably has an average particle diameter of about 0.01~20 mum.

Description

technical field [0001] The present invention relates to a light-diffusing sheet for a liquid crystal display, and more particularly, to a light-diffusing sheet prepared from a thermoplastic resin composition which transmits or scatters light, and a liquid crystal display using the light-diffusing sheet. Background technique [0002] A light-diffusing sheet made of a thermoplastic resin composition is used under a liquid crystal panel of a liquid crystal display to transmit or diffuse light from a light source. The thermoplastic resin composition is selected from: methacrylate resin, styrene resin, cycloolefin resin, polycarbonate resin, polyester resin and the like. For example, PCT Publication No. WO 01 / 96451A1 discloses a biaxially oriented polyester film for a light diffusing sheet. [0003] When preparing a light-scattering sheet, a light-scattering agent is usually added to the base resin. If the light-scattering agent is not applied to the base resin, the light-trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G64/40G02B5/02G02F1/1335H01P5/00
CPCG02B5/0242G02B5/0278C08J5/18
Inventor 吴泳金星国朴哲范
Owner HB TECH CO LTD
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