Backlight module

Abstract

This invention relates to a back light module set including a light source and a light guiding board comprising an exit surface, a base surface and at least an entrance surface, among which, the exit surface is set opposite to the base, said entrance surface is connected with said exit and the base surface, multiple transmission diffraction grating units are set on the exit surface, each one includes two zones arrayed vertically, the first zone is arrayed vertical to the direction of the nearest emit point connected with this place, the second zone grating array direction is vertical to that of the first zone.

Description

【Technical field】 [0001] The invention relates to a backlight module, in particular to a backlight module using a light guide plate with a grating structure. 【Background technique】 [0002] The backlight module in the prior art liquid crystal display includes a light source and a light guide plate. The light source is arranged relative to the light incident surface of the light guide plate. The light guide plate guides the transmission direction of the light beam emitted from the light source, and converts the line light source or point light source into a surface light source to emit. A plurality of dots are distributed on the bottom surface of the light guide plate to scatter the light beam transmitted inside the light guide plate, so as to improve the uniformity of the light beam emitted from the light guide plate. In order to further improve the light uniformity of the light guide plate, recently, the diffraction grating technology is used in the light guide plate to imp...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low light source utilization rate and poor light uniformity of the backlight module, the present invention provides a backlight module with uniform light output and high light utilization rate

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