Direct lighting backlight module

Abstract

A straight-down apheliotropic mold train includes a casing, a photoconductive device and several light source, the casing possesses a floor and several flanks one end of which is connected with the floor, the other end of the flanks forms a open-end, the photoconductive device is located at the open-end, several light sources are set in the casing and distributed below the photoconductive device, several convex areas are set on the floor of the casing, the adjacent two convex areas and the floor of the casing forms a reflecting curved surface, the photoconductive device possesses a lower surface which near the light source and a upper surface corresponding with the lower surface, the upper surface is a prism surface. The light-out of the straight-down apheliotropic mold train in the invention is homogeneous, and the brightness is high.

Description

【Technical field】 [0001] The invention relates to a direct-type backlight module, in particular to a direct-type backlight module for a liquid crystal display. 【Background technique】 [0002] In recent years, liquid crystal displays have been widely used due to their lightness, thinness, small size and low power consumption. Since the liquid crystal itself does not have light-emitting properties, a backlight module is required to provide a backlight for it to realize the display function of the liquid crystal. [0003] There are two types of backlight modules: edge-lit and direct-lit. For liquid crystal displays of small and medium sizes, the edge-lit backlight module has the advantages of lightness, thinness and low power consumption. However, with the development of science and technology, the demand for large-size LCDs is increasing day by day, and the edge-lit backlight modules cannot meet the brightness requirements of large-size LCDs, so direct-type backlight modules...

AI Technical Summary

Problems solved by technology

[0007] However, when the above-mentioned direct type backlight module 10 uses the diffusion plate 14 to improve the uniformity of the outgoing light, the incident light beam needs to be scattered multiple times in the diffusion plate 14, and part of the energy of the light beam will be lost in the scattering process, so that the outgoing light The brightness is reduced, so it is difficult to meet the brightness requirements of the liquid crystal display panel, and the cost of the diffusion plate is high, so that the cost of the direct type backlight module is also high

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