Backlight module and diffusion plate thereof

Abstract

A diffusion plate comprises a body made of transparent materials. The body comprises a first surface and a second surface opposite to the first surface, wherein, the first surface is provided with a plurality of first long strip arc grooves and a plurality of second long strip arc grooves, which are alternately distributed; when the first long strip arc grooves and the second long strip arc grooves extend from one side of the diffusion plate to the other side, the width of the first long strip arc grooves gradually increases while the width of the second long strip arc grooves gradually decreases; the second surface is provided with a plurality of first long strip arc bulges and a plurality of second long strip arc bulges, which are alternately distributed; when the first long strip arc bulges and the second long strip arc bulges extend from one side of the diffusion plate to the other side, the width of the first long strip arc bulges gradually increases while the width of the second long strip arc bulges gradually decreases. The diffusion plate has the advantages of improving effective utilization ratio of light and enjoying uniformity of light emission. The invention also provides a backlight module adopting the diffusion plate.

Description

technical field [0001] The invention relates to a backlight module and a diffusion plate thereof, in particular to a backlight module for liquid crystal display and a diffusion plate thereof. Background technique [0002] See figure 1 , shows a conventional direct type backlight module 100, which is mainly used in liquid crystal display. The backlight module 100 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 enters the diffusion plate 13 and is diffused. 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 th...

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

And because the elongated V-shaped protrusions 105 on the prism layer 103 of the prism sheet 10 are regular arrays of a single structure, during use, the array arrangement is easy to overlap with the matrix arrangement of the pixels of the liquid crystal panel, so that the light is Moire interference easily occurs between the prism sheet 10 and the liquid crystal panel, resulting in interference fringes on the liquid crystal display panel, thus affecting the display effect of the liquid crystal display panel

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