Optical diffusion barrier

Abstract

The invention relates to an optical diffusion barrier which comprises a substrate, a diffusion layer and a back layer, wherein the diffusion layer is ultraviolet-cured on any one of the surfaces of the substrate by coating solution comprising optical diffusion particles A, resin A and photo-initiator, wherein the resin A consists of epoxy acrylate resin and urethane acrylate with 8 degrees of functionality in the weight ratio of 1:9-9:1; the back layer is ultraviolet-cured on the other surface of the substrate by coating solution comprising optical diffusion particles B, resin B, photo-initiator and antistatic agent, wherein the resin B consists of pentaerythritol triacrylate and caprolactone modified dipentaerythritol penta/hexa-acrylate in the weight ratio of 1:9-9:1; the optical diffusion particles A consist of high polymer micro-spheres in particle sizes of 10-25 microns and inorganic particles in the particle sizes of 1-4 microns, in the weight ratio of 2:1-4:1; the optical diffusion particles B are inorganic particles in the particle sizes of 2-4 microns; and the diffusion barrier has high hardness, thin coating layer and high transmittance, full diffusion performance and good antistatic property and can meet the development direction of a flat panel display in large size, thinning, light weight and low cost.

Description

technical field [0001] The invention relates to an optical diffusion film for a liquid crystal display. Background technique [0002] For a long time, flat panel displays have been widely used in TVs, computer monitors, notebook computers, mobile phones, digital cameras, handheld computers, GPS navigators, etc. The picture light source of these liquid crystal displays is provided by the backlight module, and the requirements for the light source are uniform and high brightness. [0003] The role of the optical diffusion film is to uniformly diffuse the light from a point light source or a line light source into a uniform, high-brightness surface light source through refraction. This optical diffusion film is widely used in the backlight module of liquid crystal display or plasma display. [0004] The typical structure of the flat panel display backlight module device is: the light is emitted from the light source, passes through the reflective film, the light guide plate a...

AI Technical Summary

Problems solved by technology

[0005] In addition to the development of large-scale flat panel displays, it is also expected to meet the requirements of thinning, light weight and cost reduction. However, most of the diffusion films in the existing backlight modules are heat-cured. The diffusion obtained by this method The film has the disadvantage of low hardness. In order to obtain a certain hardness and ensure its diffusivity at the same time, the thickness of the coating must be increased, which increases the cost of the backlight module, reduces the light transmittance, and reduces the clarity and clarity of the display. Brightness of color; In addition, the production cycle of heat curing method is long, which is not conducive to improving production efficiency

[0006] In addition, in the existing optical diffusion film, the lower surface of the anti-scratch layer of the back layer of the diffusion film is a smooth surface, which easily causes displacement or adhesion between the diffusion film and the light guide plate. Electrostatic adsorption of impurities and other phenomena

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