Backlight module and diffusion plate thereof

Abstract

A diffusion plate comprises a body; wherein, the body is made of transparent materials in which scattering particles are dispersed and comprises a first surface and a second surface opposite to the first surface; the first surface is provided with a plurality of alternately distributed first long strip arc grooves and second long strip arc grooves; 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 alternately distributed first long strip arc bulges and second long strip arc bulges; 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 and figure 2 , shows an existing direct-lit backlight module 100, which includes a frame 11, a plurality of light sources 12 arranged inside the frame 11, a diffusion plate 13 arranged above the light sources 12 and covering the frame 11, and A prism sheet 10. Wherein, the diffusion plate 13 generally contains scattering particles for diffusing light. The prism sheet 10 includes a transparent substrate 101 and a prism layer 103 formed on the transparent substrate 101 . The prism layer 103 has a plurality of elongated V-shaped protrusions 105 . [0003] When in use, the light generated by the plurality of light sources 12 enters the diffuser plate 13 and is uniformly diffused, then continues to enter the prism sheet 10, and under the actio...

AI Technical Summary

Problems solved by technology

However, when the light is transmitted in the upper diffusion sheet 14, part of the light will be absorbed by the upper diffusion sheet 14 and cause part of the light loss; and the use of the upper diffusion sheet 14 will also increase the number of interfaces in the transmission process of the light, thereby increasing the light transmission. Therefore, the use of the upper diffusion sheet 14 will reduce the utilization rate of light and reduce the brightness of the backlight module 100.

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