Direct-type backlight module and liquid crystal display device thereof

Abstract

The invention provides a direct-type backlight module. The direct-type backlight module comprises a light guide plate, the light guide plate comprises a light-in surface which is adjacent to an LED lamp and a light-out surface which is opposite to the light-in surface, a conical groove which corresponds to the LED lamp is formed in the light-in surface of the light guide plate, and an inverted conical groove which corresponds to the conical groove is formed in the light-out surface; through the cooperation effect of the grooves in the two surfaces, even emergence of light rays which are givenout by the LED lamp is achieved. Compared with the prior art, the direct-type backlight module has the advantages that a lens does not need to be arranged on the LED lamp, the light mixing distance isnot needed, and even emergence of the light rays of a light source can be achieved; accordingly, under the situation that sufficient light mixing is guaranteed, the thickness of the direct-type backlight module is reduced in the vertical direction, and the thin-type design of the direct-type backlight module is facilitated.

Description

technical field [0001] The present application relates to the field of display technology, in particular to a direct-lit backlight module and a liquid crystal display device thereof. Background technique [0002] At present, the liquid crystal display device is the mainstream in the field of flat panel display. Since the liquid crystal display itself does not emit light, the backlight module is one of the key components of the liquid crystal display device. The function of the backlight module is to provide a light source with sufficient brightness and uniform distribution. Make the display device display images normally. Therefore, the liquid crystal display device mainly includes a backlight module and a panel. The thickness of the backlight module directly determines the thickness of the liquid crystal display device. To realize an ultra-thin liquid crystal display device, it is necessary to reduce the thickness of the backlight module. [0003] According to the position...

AI Technical Summary

Problems solved by technology

In the backlight module, the diffusion plate is usually mixed with PS particles, diffusing agent particles and other additives, and then put into the extrusion molding machine to form. Scattering effect to achieve uniform outgoing light, due to the need for a certain mixing distance, plus the light source and lens occupy a certain space, resulting in a large thickness of the direct type backlight module

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