Economical direct-type backlight assembly

Abstract

An economical direct-type backlight assembly comprises a back plate, a reflecting plate, a backlight source, and two to four diffusion sheets. The diffusion sheets are formed by diffusion-type diffusion sheets or light-collecting diffusion sheets in a single or mixed assembly mode; the two faces of the diffusion-type diffusion sheets are each of a regular polygonal groove structure and a lenticular bulge correspondingly for diffusing light rays for multiple times, and thus the light brightness and brightness uniformity are improved; the light-collecting diffusion sheets are each of an ABA structure, one of the outer layer faces on the two sides of each light-collecting diffusion sheet is a pattern face and smooth face, and the other outer layer face is a circular-arc-shaped strip bulge ora triangular strip bulge, a middle layer is composed of a transparent matrix and a light diffusion agent, thus the light ray brightness is further increased while light rays are evenly diffused by thelight-collecting diffusion sheets, and the brightness uniformity of the light source is ensured while the production cost of the direct-type backlight assembly is lowered; and by arranging the relative number of the diffusion-type diffusion sheets and the light-collecting diffusion sheets, the using requirements of the backlight assembly for different brightness are met.

Description

technical field [0001] The invention relates to the technical field of LED equipment, in particular to an economical direct-lit backlight assembly. Background technique [0002] Since the liquid crystal display itself cannot emit light, it needs to be provided with a uniform surface light source by a backlight assembly. At present, backlight components are divided into direct-type backlight components and side-type backlight components. The direct-lit backlight assembly usually includes a backplane, a reflector, a backlight, a diffuser, and a prism sheet. Because the direct-lit backlight assembly evenly arranges LED grains behind the liquid crystal panel as a light source, the backlight can be evenly transmitted to the entire screen. , the details of the picture are more delicate and realistic, so the direct-type liquid crystal display still occupies a certain sales market. Different customers have different requirements for the brightness of LCD monitors. The audio-visual...

AI Technical Summary

Problems solved by technology

Different customers have different requirements for the brightness of LCD monitors. The audio-visual distance of household LCD monitors is relatively short and there is no need for excessive brightness requirements from the perspective of protecting eyesight, reaching 180cd / m 2 That’s enough, but the brightness requirements for outdoor commercial LCD displays are relatively high, and generally need to reach 200cd / m 2 above

The function of the prism sheet is mainly to adjust the light-gathering structure of the light exit angle, so the prism sheet has a good adjustment effect on the improvement of the brightness of the light source, but the cost of the prism sheet is relatively high, which is about 4 to 5 times that of the diffusion sheet, so it leads to The cost of direct-type backlight components is high, which weakens the competitive advantage; secondly, the overall thickness of direct-type backlight components is relatively large, which is a bit bulky, which is contrary to the actual demand of the market for light type

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