A kind of backlight module and liquid crystal display device

Abstract

The invention discloses a backlight module and a liquid crystal display device, and relates to the technical field of liquid crystal display. The problem that bright spots exist in a direct-type backlight module locally can be effectively solved. The backlight module comprises LED light-emitting chips and a prismatic lens. The prismatic lens comprises a substrate and a microprism structure arranged on the substrate. The microprism structure comprises triangular prism microstructures of a first type and triangular prism microstructures of a second type. The vertex angle of the cross section of each prism microstructure of the first type is lager than the vertex angle of the cross section of each prism microstructure of the second type, the reflecting effect of the triangular prism microstructures of the second type on small-angle light emitted by the LED light-emitting chips is larger than the refracting effect, and therefore the problem that bright spots exist in the backlight module locally can be effectively relieved or even eliminated. The backlight module is applied to the liquid crystal display device.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a backlight module and a liquid crystal display device. Background technique [0002] A liquid crystal display device includes an LCD liquid crystal panel for displaying image content and a backlight module for providing a white light source to the LCD liquid crystal panel. According to the position of the light source relative to the LCD liquid crystal panel, the backlight module is mainly divided into side-light type and direct-light type. Wherein, the light source of the direct type backlight module is located directly below the LCD liquid crystal panel. [0003] example, such as figure 1 As shown, a typical structural diagram of a direct type backlight module in the prior art, refer to figure 1 As shown, the direct type backlight module 100 mainly includes a backplane 101, a reflection sheet 102 arranged on the inner surface of the backplane 101, a plurality...

AI Technical Summary

Problems solved by technology

[0004] use figure 1 In the direct-lit backlight module with the structure shown, it is occasionally found that more light is refracted from the prism sheet 106 directly above the LED light-emitting chip 103, such as figure 2 As shown, bright spots 108 appear locally on the direct-lit backlight module, resulting in subjective defects

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