Direct backlight module

Abstract

The invention relates to a direct backlight module which comprises a frame, a plurality of light-emitting diodes, a diffusion plate, a first optical plate and a second optical plate, wherein the light-emitting diodes are arranged on a bottom plate of the frame, the diffusion plate is arranged above the light-emitting diodes, the second optical plate is arranged between the light-emitting diodes and the diffusion plate, and the first optical plate is arranged above the diffusion plate at intervals; a plurality of optical microstructures are formed at a light exit surface of the first optical plate; a light exit surface of the second optical plate is a plane, and a light entry surface of the second optical plate is close to the light-emitting diodes; and the second optical plate also comprises a plurality of V-shaped ridge structures which are formed at the light entry surface, extend along at least two different directions, and are mutually staggered. The direct backlight module has better exit ray uniformity and is suitable for thinned design.

Description

technical field [0001] The invention relates to a direct type backlight module, in particular to a direct type backlight module applied to liquid crystal displays. Background technique [0002] Liquid crystal display devices are widely used in electronic products such as personal digital assistants, notebook computers, digital cameras, mobile phones, and LCD TVs. However, since the liquid crystal display device itself cannot emit light, it needs a direct-lit backlight module to produce a display function. [0003] See figure 1 , a direct type backlight module 100 includes a frame 10 , a reflector 12 , a plurality of LED light emitting diodes 14 , a diffuser 16 and a plurality of optical sheets 18 . The plurality of LED light emitting diodes 14 are disposed on the bottom plate of the frame 10 , and the plurality of optical sheets 18 are disposed on the opening of the frame 10 . The diffuser plate 16 is disposed between the LED light emitting diodes 14 and the plurality of ...

AI Technical Summary

Problems solved by technology

However, if the depth of the frame is increased, the brightness of the emitted light will be reduced, and if the arrangement density of the LED light-emitting diodes 14 is increased, the power consumption will be increased, and the cost will be increased, resulting in a large thickness of the direct-type backlight module 100, which is difficult to meet the requirement of thinness. design requirements

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