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Process for producing light-diffusing element, light-diffusing element, and processes for producing polarizing plate with light-diffusing element and liquid-crystal display device

A manufacturing method and a technology of light diffusion, applied in the direction of optical elements, diffusing elements, polarizing elements, etc., can solve the problems of complex manufacturing process, insufficient productivity, and impracticality, and achieve suppression of backscattering, high productivity, and Effect of amplifying the refractive index difference

Inactive Publication Date: 2012-02-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these microparticles require a complicated manufacturing process compared with ordinary microparticles, so productivity is not sufficient to be practical.

Method used

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  • Process for producing light-diffusing element, light-diffusing element, and processes for producing polarizing plate with light-diffusing element and liquid-crystal display device
  • Process for producing light-diffusing element, light-diffusing element, and processes for producing polarizing plate with light-diffusing element and liquid-crystal display device
  • Process for producing light-diffusing element, light-diffusing element, and processes for producing polarizing plate with light-diffusing element and liquid-crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119]

[0120] 18.2 parts of resin for hard coating (manufactured by JSR Corporation, trade name "Opstar KZ6661" (containing MEK / MIBK)) containing 62% of zirconia nanoparticles (average particle diameter: 60 nm, refractive index: 2.19) as an ultrafine particle component 6.8 parts of a 50% MEK solution, a photopolymerization initiator (Ciba Seika Co., Ltd., trade name "Irgacure 907") 0.068 parts, leveling agent (DIC Corporation, trade name "GRANDIC PC4100") 0.625 parts, and polymethyl methacrylate (PMMA) fine particles as light diffusing fine particles (manufactured by Negami Industry Co., Ltd., trade name "ARTPEARL J4P", average particle diameter is 2.1 μm, refractive index is 1.49) 2.5 parts. The mixture is subjected to ultrasonic treatment for 5 minutes to prepare a coating liquid in which the above-mentioned components are uniformly dispersed. Use The coating solution was applied on a TAC film (manufactured by Fujifilm Corporation, trade name "Fujitac") with a bar coater...

Embodiment 2

[0121]

[0122]A coating liquid was prepared in the same manner as in Example 1. After the coating solution was left to stand for 4 hours, coating was performed in the same manner as in Example 1. A light-diffusing element was obtained in the same manner as in Example 1 except that the drying temperature after coating was 60° C. and the thickness was 10 μm. The obtained light-diffusing element was used for the evaluation of said (1)-(6). The results are shown in Table 1.

Embodiment 3

[0123]

[0124] A light-diffusing element was obtained in the same manner as in Example 1 except that the drying temperature after application of the coating liquid was 60°C. The obtained light-diffusing element was used for the evaluation of said (1)-(6). The results are shown in Table 1. In addition, the TEM photograph of the cross section of the light diffusion element is shown in Figure 7 middle. From this TEM photograph, it was confirmed that a concentration-adjusted region was formed inside the light-diffusing fine particles.

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Abstract

A process for producing a light-diffusing element is provided by which a light-diffusing element having a high haze and high diffusing properties and reduced in backward scattering can be produced at low cost with high productivity. The process for producing a light-diffusing element comprises a step in which a matrix-forming material comprising a resin-ingredient precursor and an ultrafine-particle ingredient is brought into contact with fine light-diffusing particles, a step in which at least some of the precursor is infiltrated into an inner part of the fine light-diffusing particles, and a step in which the precursor that has infiltrated into the inner part of the fine light-diffusing particles and the precursor that has not infiltrated into the fine light-diffusing particles are simultaneously polymerized to form a matrix comprising the resin ingredient and the ultrafine-particle ingredient and simultaneously form a concentration gradation region in the vicinity of the inner side of the surface of the fine light-diffusing particles.

Description

technical field [0001] The present invention relates to a manufacturing method of a light diffusing element, a light diffusing element, a polarizing plate with a light diffusing element, and a manufacturing method of a liquid crystal display device. Background technique [0002] Light diffusing elements are being widely used in lighting lampshades, screens of rear projection TVs, surface emitting devices such as liquid crystal display devices, and the like. In recent years, the utilization of a light-diffusion element to improve the display quality of a liquid crystal display device etc., improvement of a viewing angle characteristic, etc. is progressing. As a light-diffusion element, the element which disperse|distributed microparticles|fine-particles in matrices, such as a resin sheet, etc. are proposed (for example, refer patent document 1). In such a light diffusing element, most of the incident light is scattered forward (exit surface side), and part of it is scattered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02F1/1335
CPCB29D11/00663B29D11/00798G02B5/02G02B5/30G02F1/1335
Inventor 渊田岳仁武本博之首藤俊介宫武稔
Owner NITTO DENKO CORP
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