Backlight and display device

Abstract

The invention provides a backlight and a display device. The backlight comprises a light-emitting unit and a diffusion plate. The light-emitting unit comprises a plurality of rotating areas, each rotating area is internally provided with at least one light source, and the light-out face of each light source faces towards the side wall of the backlight. Light irradiated to the side wall of the backlight can be reflected to the diffusion plate through the side wall of the backlight. The light sources in the backlight give out light to the side wall of the backlight in the rotating state, and the light is ejected from the diffusion plate after being reflected. When light mixing is conducted by a certain distance, the optical distance of the light from the light sources to the diffusion plate is increased, and thus the uniformity of the light which is irradiated to all the areas of the diffusion plate is improved, and the uniformity of a display frame can be improved easily; meanwhile, the thickness of the backlight can be reduced. In addition, compared with the prior art, the requirement for the light-emitting angle of each light source is low, and the cost of the backlight can be lowered correspondingly.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a backlight source and a display device. Background technique [0002] The backlight source is an indispensable part of the liquid crystal display device to realize the display. Existing backlights are mainly classified into direct-type backlights and side-type backlights. [0003] figure 1 It is a schematic diagram of an existing direct type backlight source. Such as figure 1 As shown, the backlight includes a diffuser plate 11 and a light source 14 (generally LED), and the diffuser plate 11 and the light source 14 are installed on the backplane 12 of the backlight ( figure 1 Only the sidewalls of the backplane 12 are shown). exist figure 1 In the shown backlight, the light emitting direction of the light source 14 faces the direction of the diffusion plate 11, and the light passes through the diffusion plate 11 and is emitted from the light emitting surface...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned direct type backlight, in order to make the light irradiated on the diffusion plate 11 as uniform as possible (that is, to make the brightness of each place on the diffusion plate 11 as uniform as possible), on the one hand, the number of light sources 14 can be increased, Increase the distribution density of the light source 14; but this will lead to the generation of a large amount of heat, when the heat cannot be dissipated in time, the heat will cause damage to the diffusion plate 11 and other components

On the other hand, the light emitting angle of the light source 14 can be increased, so that the light emitted by each light source 14 can be mixed to a greater extent; Lighting angle, etc.; but this will undoubtedly increase the cost of the backlight

In addition, the distance between the light source 14 and the diffuser plate 11 can also be increased, so that the light emitted by each light source 14 can achieve a greater degree of light mixing; this can also increase the uniformity of the light irradiated on the diffuser plate 11, but in this way Will make the thickness of the backlight larger

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