Optical diffusion film and preparation method thereof

Abstract

The invention discloses an optical diffusion film which comprises a transparent platy optical substrate as well as an optical diffusion layer and a diffusion anti-bonding layer which are formed on the two surfaces of the optical substrate, wherein the optical diffusion layer is coating liquid prepared by mixing the following materials by weight parts: 10-30 parts of adhesives, 10-30 parts of diffusion particles, 1-5 parts of cross-linking agents, 0.5-3 parts of diffusion agents and 40-70 parts of diluents, and the coating liquid is fixed on the surface of the optical substrate and dried to be cured into a film; the diffusion anti-bonding layer is coating liquid which is prepared by mixing the following materials by weights: 30-60 parts of adhesives, 0.5-5 parts of diffusion particles, 0.5-5 parts of antistatic agents, 1-10 parts of cross-linking agents and 30-60 parts of diluents, and the coating liquid is fixed on the surface of the optical substrate and is dried to be cured into a film. The adhesives comprise polyacrylate polyalcohol and polyester polyol; the diffusioin particles are high polymer resin microbeads; the cross-linking agents are fatty polyisocyanate; and the diluents have high volatilization speed, medium volatilization speed and low volatilization speed. The optical diffusion film is good in the coordination of film coating hardness, transparency and scratching resistance.

Description

technical field [0001] The invention relates to an optical diffusion film used in a backlight module of a flat panel display and a preparation method thereof. Background technique [0002] In recent years, various new flat panel display (FPD, such as LCD, PDP, etc.) technologies and products have developed rapidly. The flat panel display industry has become an important part of the information industry, and the FPD industry and market are growing rapidly worldwide. Flat panel displays are widely used in large-size display markets, such as TVs, computer monitors, notebook computers, and small and medium-sized display markets, such as mobile phones, MP3, MP4, MP5, car DSC / DV, digital frame, GPS, PDA, automotive electronics, etc. . Since the FPD itself cannot emit light, it needs a backlight unit (BLU) to provide sufficient brightness and a uniform light source so that it can display images normally. The backlight unit has become a key technical component of the FPD. The back...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing optical diffusion film, there is a problem of coordination between the hardness, transparency and scratch resistance of the optical diffusion layer and the diffusion anti-adhesion layer in use.

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