Light diffusing plate

Abstract

The invention relates to an optical diffuser plate for use in a liquid crystal device, comprising a layer composite structure which at least consists of one substrate layer and side layers, wherein each side layer comprises two layers; the substrate is clipped in the side layer; the substrate layer adopts polystyrene (PS) as a base material and is combined with optical diffusant to form a blending layer; and the side layers all adopt a blending layer which takes the polystyrene (PS) as the base material to be combined with the optical diffusant and benzotriazole ultraviolet absorbent. Through adopting the polystyrene (PS) as the base material, the diffuser plate has higher light transmittance; meanwhile, the polystyrene has low water absorbing capability, little effect to the deformation caused by ambient humidity change, so that the diffuser plate has excellent size stability. The structure ensures that the optical diffuser has excellent light transmittance and light distribution uniformity; and at the same time, the diffuser plate has the excellent size stability, thereby reducing etiolation of the base material caused by irradiation of ultraviolet rays, prolonging service life and greatly reducing production and manufacturing cost.

Description

technical field [0001] The invention relates to a light diffusion plate, in particular to a light diffusion plate applied to a liquid crystal display device, and belongs to the technical field of polymer materials. Background technique [0002] The liquid crystal display (Liquid Crystal Display, LCD) device itself is a display device that does not emit light. If it is not a reflective application, it needs to be equipped with a backlight source to realize the display function. [0003] The backlight module can be divided into two types: edge-lit and direct-lit. The side-light type installs a light source on one or more sides of the LCD screen, guides and scatters the light through the light guide plate to become a surface light source that can illuminate the LCD screen, and makes the illumination more uniform through the diffusion plate. The side-light design is more suitable for small and medium-sized liquid crystal displays, but for large-size liquid crystal displays (and...

AI Technical Summary

Problems solved by technology

Obviously, this existing diffusion plate, because the substrate does not have or seldom has the light diffusion effect, but only relies on the primary light diffusion of the diffusion film, and because it adopts the coating production method, the surface of the diffusion film The flatness and parallelism between the diffusion film and the substrate are poor, so the optical effects such as haze and brilliance of this existing diffusion plate are relatively poor, and the quality of light diffusion is not ideal, and the diffusion caused by ultraviolet rays There are no effective countermeasures for the yellowing phenomenon and life reduction of the board

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