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Light diffusion film having good uniformity of surface roughness and method for manufacturing the same

A surface roughness and light diffusing film technology, applied in nonlinear optics, optics, optical components, etc., can solve the problems of non-optical characteristics, uneven uneven pattern, difficult to control, etc., to achieve excellent optical characteristics, good surface roughness The effect of uniformity

Active Publication Date: 2010-07-21
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inhomogeneity of the concave-convex pattern, it is impossible to fully achieve uniform optical properties such as light transmittance and diffusion.
In addition, conventional light diffusing films are usually only evaluated based on the Ra value
Therefore, it is difficult to control i.e. there is no bias

Method used

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  • Light diffusion film having good uniformity of surface roughness and method for manufacturing the same
  • Light diffusion film having good uniformity of surface roughness and method for manufacturing the same
  • Light diffusion film having good uniformity of surface roughness and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0036] figure 1 The blasting process used as the main process parameter in treating the roll surface is shown. In Examples 1-3, steel rolls were treated according to the abrasives and number of treatments listed in Table 1.

[0037] refer to figure 2, The light-diffusing film of the present invention was produced from polycarbonate resin using an extruder. The extruder used the blasted roll of the present invention as the second cooling roll 23 . The mold width is 600mm. The rubber roll 22, the blasted roll 23, and the untreated roll 24 were used as the first, second, and third cooling rolls, respectively. Extrusion from the die was performed at a discharge rate of 23.4 kg / hr set at 290°C using PC-110 grade polycarbonate resin available from Chimei Corporation. At this time, the temperatures of the first cooling roll 22, the second cooling roll 23, and the third cooling roll 24 were 90°C, 110°C, and 130°C, respectively.

[0038] The resulting polycarbonate light diffus...

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Abstract

A light diffusion film having a good uniformity of surface roughness and a method for manufacturing the same are provided. The film may be formed from a thermoplastic resin and may have an embossed pattern on at least one side of the film. The film may exhibit good uniformity of surface roughness, with an Ra of 0.5 to 3 [mu]m and an HDI of 3 to 8 [mu]m. The film may allow irregular light radiated from the light source of an LCD TV to effectively diffuse and transmit through the film to thereby exhibit uniform brightness at the final panel.

Description

technical field [0001] The present invention relates to a light-diffusing film with good uniformity in surface roughness and a method for manufacturing the light-diffusing film. Background technique [0002] In recent years, display devices such as liquid crystal display (LCD) devices are generally equipped with light-diffusing films. Light diffusing films for LCD devices are generally used in backlight units to spread or diffuse light. [0003] Light diffusing films refer to various products used to distribute light evenly to the observer and hide defects caused by guiding light while maintaining the overall light transmittance. Such a light diffusing film for LCD devices can be used in car navigations, cellular phones, PDAs, digital cameras, portable TVs, camcorders, small or medium to large notebook computers, desktop monitors, and the like. [0004] In recent years, research on the development of a light diffusion film for use in a backlight unit of an LCD device has f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02
CPCG02B5/0278G02B5/0221G02B5/0268G02F1/133606Y10T428/24479G02B5/02
Inventor 李辰雨金邦德吴世真任昶奎黄善爱
Owner CHEIL IND INC