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Light diffusing film and manufacturing method of the light diffusing film

A technology for a light diffusing film and a manufacturing method, applied in optics, optical elements, nonlinear optics, etc., can solve the problems of large fluctuation of diffusion characteristics, difficulty in exerting good incident angle dependence, and uneven reflection.

Active Publication Date: 2012-07-11
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] In addition, since the light-diffusing films having the columnar structure regions disclosed in Patent Documents 4 to 5 tend to cause unevenness in the reflection of light in the film compared with the light-diffusing films having the louver structure regions, the incident light Due to the large fluctuation of the diffusion characteristics due to the incident angle, it is difficult to exhibit good incident angle dependence.

Method used

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  • Light diffusing film and manufacturing method of the light diffusing film
  • Light diffusing film and manufacturing method of the light diffusing film
  • Light diffusing film and manufacturing method of the light diffusing film

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Effect test

no. 1 approach

[0082] The first embodiment of the present invention is a light diffusion film having a first structure region for diffusing incident light anisotropically and a second structure region for diffusing incident light isotropically, which It is characterized in that the first structure area is a louver structure area formed by alternately arranging a plurality of plate-shaped areas with different refractive indexes in parallel along the film surface direction, and the second structure area is a louver structure area in which the refractive index and the medium stand in the medium. A column structure area formed by different columns.

[0083] Hereinafter, the first embodiment of the present invention will be specifically described with reference to the drawings as appropriate.

[0084] 1. Basic principles

[0085] Hereinafter, the basic principles of the light diffusion by the louver structure and the light diffusion by the pillar structure in the light diffusion film will be described ...

no. 2 approach

[0339] The second embodiment of the present invention is a method of manufacturing a light-diffusion film, which has a first structure region for anisotropically diffusing incident light and a second structure region for isotropically diffusing incident light The method of manufacturing a light-diffusing film of is characterized by including the following steps (a) to (d).

[0340] (a) The process of preparing a composition for a light diffusion film;

[0341] (b) A process of applying the composition for a light diffusion film to an engineering sheet to form a coating layer;

[0342] (c) The coating layer is irradiated with a first active energy ray, and a first structure region is formed in the lower part of the coating layer. A plurality of plate-shaped regions with different refractive indexes are alternately arranged in parallel along the film surface direction. The blind structure area, and the process of not forming the blind structure area remains on the upper part of the co...

Embodiment 1

[0437] 1. Synthesis of monomer (B) component

[0438] In the container, 2 moles of isophorone diisocyanate (IPDI) as component (a) and (c) component are contained relative to 1 mole of polypropylene glycol (PPG) with a weight average molecular weight of 9,200 as component (b) After 2 moles of 2-hydroxyethyl methacrylate (HEMA), polymerized according to a conventional method to obtain a polyether urethane methacrylate with a weight average molecular weight of 9,900.

[0439] In addition, the weight average molecular weights of polypropylene glycol and polyether urethane methacrylate are polystyrene conversion values ​​measured by gel permeation chromatography (GPC) under the following conditions.

[0440] ●GPC measuring device: Tosoh Co., Ltd. product, HLC-8020

[0441] ●GPC pillar: Tosoh Co., Ltd. (listed in the order of passage below)

[0442] TSK guard column HXL-H

[0443] TSK gel GMHXL(×2)

[0444] TSK gel G2000HXL

[0445] ●Measuring solvent: Tetrahydrofuran

[0446] ●Measurement temp...

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Abstract

The invention provides a light diffusing film and a manufacturing method of the light diffusing film. The light diffusing film has good incident angle dependence in the transmission and diffusion of light and the incident angle area of light diffusion is wide. The light diffusing film is provided with a first structural area used for diffusing incident light in an anisotropic manner, and a second structural area used for diffusing incident light in an isotropic manner. The first structural area is a window-shades structural area formed by arranging a plurality of plate-shaped areas having different refractive indexes alternately along a film surface direction.

Description

Technical field [0001] The present invention relates to a light diffusion film and a manufacturing method of the light diffusion film. In particular, it relates to a louver structure region that diffuses incident light anisotropically and a column structure region that diffuses incident light isotropically, so that light transmission and diffusion have good incident angle dependence and light A light diffusion film with a wide diffusion angle of incidence area and a method for manufacturing the light diffusion film. Background technique [0002] Conventionally, in a liquid crystal display device, it is possible to recognize a given image using light emitted from a light source (internal light source) provided inside the device. [0003] However, in recent years, with the popularization of mobile phones, car-mounted TVs, etc., the opportunities for viewing LCD screens outdoors have increased, resulting in the accompanying increase in the intensity of light from internal light sourc...

Claims

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Application Information

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IPC IPC(8): G02B5/02G02B1/04B29C35/08G02F1/1335
CPCG02B5/0257
Inventor 大类知生草间健太郎所司悟
Owner LINTEC CORP
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