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Light diffusion plate for liquid crystal display

A technology of liquid crystal display and light diffusion plate, which is applied in the directions of instruments, optics, optical components, etc., can solve the problem of high cost of optical components, and achieve the effects of improved light resistance and less surface scratches

Inactive Publication Date: 2008-11-19
ASAHI KASEI E-MATERIALS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In order to improve scratch resistance, there are also resin plates with a surface cured coating treatment. However, in large-scale LCD TVs that require a reduction in the total cost of each component, the cost of optical components will increase, so it is not preferable.

Method used

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  • Light diffusion plate for liquid crystal display
  • Light diffusion plate for liquid crystal display
  • Light diffusion plate for liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] In 100 parts by mass of polystyrene resin (manufactured by PS Japan Co., Ltd., trade name G9504) with a water absorption rate of 0.1%, siloxane-based polymer particles (manufactured by Toshiba GE Silicone Co., Ltd., 2 parts by mass of product name TOSUPER 120, average particle diameter of 2 μm) was charged into the extruder for the low hygroscopicity resin layer (A). On the other hand, 3.5 parts by mass of an ultraviolet absorber (benzotriazole-based ultraviolet absorber) and inorganic 5 parts by mass of talc (manufactured by Nippon Talc Co., Ltd., average particle size: 15 μm) as a light diffusing agent was charged into the extruder for the styrene-based resin layer (B), and melted and kneaded. Then, it molded by coextrusion by the above-mentioned method, and produced the light-diffusion plate of 50 micrometers of styrene-type resin layers (B) and 2 mm of total plate thicknesses. At this time, for the vertical three-roll machine, the entire surface is engraved with un...

Embodiment 2～5

[0132] Change the amount of the ultraviolet absorber mixed in the styrene resin layer (B), and the arithmetic mean roughness size of engraving on the roller mold is changed to respectively: embodiment 2 is 6 μ m, embodiment 4 is 20 μ m, embodiment 5 Except having been 30 micrometers, it carried out similarly to Example 1, produced the light-diffusion board, and performed the evaluation of each item. The evaluation results are shown in Table 1. From the results in Table 1, it can be seen that all items meet the required specifications.

Embodiment 6～11、 comparative example 9～38

[0140] The type of resin used in the low hygroscopicity resin layer (A) or the styrene resin layer (B), the amount of the ultraviolet absorber mixed in the styrene resin layer (B), and the arithmetic mean roughness of the surface are shown in the table Except having changed as shown in 2, the light-diffusion plate was produced by the method similar to Example 1, and each item was evaluated. The evaluation results are shown in Table 2.

[0141]

[0142]

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Abstract

A light diffusion plate for liquid crystal display comprising resin layer (A) of low moisture absorption exhibiting a 24-hr water absorption, as measured in accordance with JIS K7209, of 0.2% or below and, superimposed on at least one major surface thereof, styrene resin layer (B) containing 50% or more of styrene resin and, per 100 parts by mass of the resin, 3.5 to 5 parts by mass of ultraviolet absorption agent, wherein the surface of the layer (B) has an arithmetic average roughness (Ra), as measured in accordance with JIS B0601, of 5 to 30 [mu]m. The thus provided light diffusion plate for liquid crystal display, although being based on a resin of low moisture absorption capable of avoiding any moisture absorption warpage, reduces surface scratching and is strikingly improved in light resistance.

Description

technical field [0001] The present invention relates to a light diffusion plate installed in a direct type backlight device of a liquid crystal display. Background technique [0002] The technological innovation of LCD monitors over the past few years has been astounding. Its market is expanding rapidly in the fields of notebook computer screens, monitor screens, and televisions. [0003] A liquid crystal display uses twisting of liquid crystal molecules to transmit light through the display or to block light, thereby displaying images. Liquid crystal itself is basically not a self-luminous material, so the image cannot be seen without external light. In this regard, liquid crystal displays are completely different from self-illuminating Braun tube or plasma displays, and usually must be combined with a back light source called a backlight. The so-called backlight, just like its name, is a planar light source device that emits light from the back of the liquid crystal pan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335B32B7/02B32B27/30G02B5/02
CPCY10T428/105G02B5/0226G02F2201/54Y10T428/1036G02F1/133606G02B5/0278C09K2323/03C09K2323/035G02F1/1335
Inventor 宫内雅弘古谷纪彦
Owner ASAHI KASEI E-MATERIALS CORPORATION