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Diffusion plate

A technology of light diffusing plate and polystyrene resin, applied in instruments, optics, diffusing elements, etc., can solve the problems of reducing productivity and increasing manufacturing cost, and achieve the effect of sufficient brightness, reduced use, and excellent shading properties

Inactive Publication Date: 2009-12-16
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, in order to achieve the goal of transmitting a large amount of light to the front surface through the light diffusion film, it is necessary to provide a prism film, but this will result in increased manufacturing costs and reduced productivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 12

[0075] The components and composition ratios of Examples 1 to 12 are shown in Table 1 below.

[0076] The polycarbonate resin used had a melt index (MI) defined in accordance with ASTM D1238 of 22 grams per 10 minutes (22 g / 10 min) under the conditions of 300° C. and a load of 1.2 kg.

[0077] In these examples, such as the base resin, when polycarbonate and polystyrene are used in the form of a mixture, they are added in the composition ratio shown in Table 1, and then melted at 250°C using a twin-screw extruder mixed.

[0078] The polystyrene resin used had a melt index (MI) defined in accordance with ASTM D1238 at 200° C. and a load of 5 kg at 1.5 grams per 10 minutes (1.5 g / 10 min).

[0079] As the base resin used for the surface layer, a typical styrene-acrylic acid copolymer resin in the composition of Table 1 was used.

[0080] In the composition of the light diffusion plate, the base layer is composed of a base resin and a light diffusion agent in the composition of ...

Embodiment 13 to 18

[0097] The light-diffusing plate was produced in the same manner as in Examples 1 to 12, and was produced in the same size. In addition, only polystyrene resin (glass transition temperature 115° C.) in which acrylic acid is partially copolymerized is used as the base resin of the base layer, and in Examples 15 and 16, the surface layer is formed on one side of the base layer. On the surface, and in Examples 17 and 18, the surface layer is formed on both surfaces of the base layer

[0098] The specific compositions of the light diffusing plates of Examples 13 to 18 are shown in Table 3 below.

[0099] 【table 3】

[0100]

[0101]

[0102] The total light transmittance, haze, brightness, curl, water absorption, and heat distortion temperature of the light diffusion plate thus obtained were measured. The measurement results are shown in Table 4 below.

[0103] 【Table 4】

[0104] implement

[0105] It can be clearly seen from Table 4 that in the embodiment of us...

Embodiment 19 to 24

[0107] The light diffusing plate was manufactured in the same manner as in Examples 1 to 12, and was manufactured in the same size, except that, in terms of the type of diffusing particles, silicon particles were used instead of acrylic resin particles, and in Examples 21 and 22 In Examples 23 and 24, the surface layer was formed on one surface of the base layer, and in Examples 23 and 24, the surface layer was formed on both surfaces of the base layer.

[0108] The specific compositions of the light diffusing plates of Examples 19 to 24 are shown in Table 5 below.

[0109] 【table 5】

[0110]

[0111] The total light transmittance, haze, brightness, curl, water absorption, and heat distortion temperature of the light diffusion plate thus obtained were measured. The measurement results are shown in Table 6 below.

[0112] 【Table 6】

[0113]

Example

Total transmittance

(%)

Haze

(%)

brightness

(cd / m 2 )

Curl

...

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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, which includes polycarbonate resin or polystyrene resin as a base resin, so that appropriate brightness and high hiding properties or appropriate hiding properties and high brightness are exhibited, and thus, while minimizing the use of additional optical films, brightness is sufficiently high, therefore maintaining good light emission quality. The diffusion plate has high ability to hide a light source, is inexpensively manufactured, and has high dimensional stability, so that no curling occurs even under high-temperature and high- humidity conditions, leading to excellent light properties.

Description

technical field [0001] The invention relates to a light diffusion plate used for a liquid crystal display or a backlight module of an illuminating device. Background technique [0002] As the industrial society has moved toward the advanced information age, the importance of electronic displays as media for displaying and transmitting various information is also increasing day by day. In the past, the bulky cathode ray tube (Cathode Ray Tube, hereinafter referred to as CRT) has been widely used, but from the perspective of the space required for installing the CRT, it is faced with quite a lot of restrictions, so that it is difficult to manufacture a tube with a large size. the CRT. As a result, CRTs are gradually being replaced by various forms of flat panel displays, including liquid crystal displays (LCDs), plasma displays (PDPs), field emission displays (FEDs), and organic electroluminescent displays (ELs). Among these flat panel displays, especially LCD, a technology-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02
CPCG02B5/0278G02B5/0215G02B5/0231G02F1/133606
Inventor 韩秉熙赵允熹李羲政
Owner KOLON IND INC
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