Diffusion plate for backlight source of liquid crystal display

Abstract

The invention relates to a diffusion plate for a backlight source of a liquid crystal display. A laminated composite structure at least consists of a substrate layer and a lateral layer, wherein the lateral layer has two layers, and the substrate layer is clamped between the two layers; the substrate layer is a blending layer which adopts polystyrene as a base material to be combined with a light diffusion agent; and the lateral layer is a blending layer which uses a transparent base material containing polyester, the light diffusion agent and a benzotriazole ultraviolet absorbent. As PS is adopted as the base material, the diffusion plate has higher light transmission rate; the PS has small water absorption rate, and has small deformation due to changes of environment humidity, so that the diffusion plate has excellent dimension stability; and furthermore, the lateral layer adopts the blending layer, etiolation caused by ultraviolet radiation can be reduced, and the service life of the diffusion plate can be prolonged.

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 backlight source, 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 dis...

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

Images