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Optical diffusion element

A technology of light diffusion and light diffusion film, which is applied in the direction of optical elements, diffusion elements, optics, etc., can solve the problems of decreased contrast ratio and difficulties, and achieve the effect of high turbidity and less uneven appearance

Active Publication Date: 2013-05-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a method has a problem that the total reflection at the interface of a large inclined portion in the concave-convex surface causes a decrease in the contrast ratio
However, it is more difficult to mass-produce a light-diffusing element (for example, a light-diffusing element having a large difference in refractive index between a microparticle and a matrix) having a strong diffusivity required for a liquid crystal display device by strictly controlling the film thickness without causing appearance unevenness. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] For Example 1, use a time-of-flight secondary ion mass spectrometer (TOF-SIMS, time-of-flight Secondary ion mass spectrometer) (manufactured by ION-TOF Company, trade name "TOF-SIMS5") to measure the The distribution of the fluoride ion intensity.

[0140]

[0141] Resin for hard coating (manufactured by JSR Corporation, trade name "OPSTAR KZ6661" (including MEK / To 100 parts of MIBK)), 50% methyl ethyl ketone (MEK) of pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Biscoat #300", refractive index 1.52) was added as a precursor of the resin component. 11 parts of a solution, 0.5 parts of a photopolymerization initiator (manufactured by Japan BASF Corporation, trade name "Irgacure 907"), polymethyl methacrylate (PMMA) microparticles (manufactured by Sekisui Chemical Industry Co., Ltd., trade name "XX-131AA", with an average particle diameter of 2.5 μm, a refractive index of 1.495) 15 parts, and 0.5% of the above-ment...

Embodiment 2

[0146] Instead of the fluorosurfactant ( DIC company make, brand name "Megafac RS-716"), and the light-diffusion element was obtained in the same manner as Example 1 except this. The characteristics of the light-diffusing film not described in Table 1 are as follows: L=49nm, Δn=0.12, Δn / L=0.0024, half-value angle of light diffusion=60°, L / r P =0.04, backscatter rate=0.37%.

Embodiment 3

[0148] Instead of the fluorosurfactant ( DIC company make, brand name "Megafac RS-716"), and the light-diffusion element was obtained in the same manner as Example 1 except this. The characteristics of the light-diffusing film not described in Table 1 are as follows: L=50nm, Δn=0.12, Δn / L=0.0024, half-value angle of light diffusion=60°, L / rP = 0.04, backscatter rate = 0.38%.

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Abstract

Provided is an optical diffusion element which, while having excellent optical diffusion properties (i.e. while having elevated hazing), has little irregularity in external appearance. The optical diffusion element according to the present invention has a substrate film and an optical diffusion film provided on one face of the substrate film. The haze value of the optical diffusion film is at least 75%. The optical diffusion film includes a fluorine-based surfactant. The fluorine-based surfactant is unevenly distributed on the optical diffusion film, on the face opposite the substrate film. The fluorine-based surfactant includes at least one type of structural unit selected from the group comprising: a structural unit represented by general formula (I); a structural unit represented by general formula (II); and a structural unit represented by general formula (III). In general formula (I) m is an integer of 1 to 10, and in general formula (II) n is an integer of 2 to 10.

Description

technical field [0001] The present invention relates to a light diffusing element. Background technique [0002] Light diffusing elements are widely used in lighting covers, screens of projection televisions, surface emitting devices (eg, liquid crystal display devices), and the like. In recent years, improvement of display quality, improvement of viewing angle characteristics, etc. which use a light-diffusion element in a liquid crystal display device etc. are progressing. The industry requires such a light diffusing element to have strong light diffusing properties and less backscattering. As a method of enhancing light diffusibility, a method of increasing external haze or internal haze is mentioned. [0003] As a method of increasing external haze, unevenness is generally provided on the surface of the light-diffusing element. However, such a method has a problem in that total reflection at the interface of a large inclined portion of the concave-convex surface causes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02F21V3/04G02F1/1335
CPCG02F1/133504G02B5/0226G02F2202/36G02B5/0294G02B5/02G02B5/3025G02F1/133606G02B6/0001G02B5/0242G02B5/0278G02F1/1335
Inventor 西村明宪泷田智仁渊田岳仁武本博之
Owner NITTO DENKO CORP