Backlight module and optical plate thereof

Abstract

A backlight module comprises a frame, a light source and an optical plate; wherein, the light source is positioned in the frame; the optical plate is arranged above the light source and comprises a transparent body; the transparent body comprises a first surface and a second surface opposite to the first surface; the first surface is provided with a plurality of long strip V-shaped bulges and a plurality of long strip arc bulges; the long strip V-shaped bulges and the long strip arc bulges are alternately arranged and are mutually parallel; the second surface is provided with a plurality of long strip arc grooves and the extension directions of the long strip arc grooves intersect with the extension directions of the long strip arc bulges. The invention also provides the optical plate adopted by the backlight module. The backlight module has the advantages of improving efficient utilization ratio of light and enjoying uniformity of light emission.

Description

technical field [0001] The invention relates to a backlight module and its optical board, in particular to a backlight module for liquid crystal display and its optical board. Background technique [0002] See figure 1 , shows a conventional direct-lit backlight module 100, which includes a frame 11, a plurality of light sources 12 disposed inside the frame 11, and a diffusion plate 13 disposed above the light sources 12 and covering the frame 11. [0003] In use, the light generated by the plurality of light sources 12 can be diffused after entering the diffuser plate 13 . However, after being diffused by the diffuser plate 13, the angles at which light emerges from the diffuser plate 13 become more chaotic, so that its brightness in a specific viewing angle range is not high; It is still often difficult for the plate 13 to directly diffuse the light from the light source 12 evenly, so that the light emitted from the diffuser plate 13 is prone to light source afterimages,...

AI Technical Summary

Problems solved by technology

[0005] However, when the light is transmitted in the prism sheet 10 and the upper diffusion sheet 14, part of the light will be absorbed and cause light loss; The number of interfaces increases the interface loss of light transmission and reduces light utilization

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