Backlight module and optical plate

Abstract

The invention relates to a backlight module which comprises a plurality of light sources, a frame accommodating the light sources and an optical plate. The optical plate is made of a transparent body which comprises a first surface and a second surface opposite to the first surface, wherein the first surface of the transparent body is provided with a plurality of mutually paralleled strip arc-shaped grooves and a pitch between adjacent arc-shaped grooves is about 0.025 millimeters to about 1.5 millimeters. The second surface is provided with a plurality of mutually paralleled strip V-shaped bulges and the extension directions of the strip V-shaped bulges on the second surface of the optical plate are crossed with that of the strip arc-shaped bulges on the first surface. A pitch between strip V-shaped bulges is about 0.025 millimeters to about 1 millimeter. The thickness optical plate is 0.5 millimeters to about 3 millimeters. The invention also provides the optical plate adopted by the backlight module. The backlight module has the advantages of improving effective utilization rate of lights and well-distributing the lights.

Description

technical field [0001] The invention relates to a backlight module and its optical board, in particular to a direct-type backlight module for liquid crystal display and its optical board. 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] During 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 action of ...

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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