Backlight module and liquid crystal display device

Abstract

The invention discloses a backlight module and a liquid crystal display device. The backlight module comprises a light source, a light guide plate and a reflector plate; the light guide plate comprises an incident surface, a bottom adjacent to the incident surface, an emergent surface which is adjacent to the incident surface and opposite to the bottom, and a plurality of sides; the light source is arranged on one side of the incident surface of the light guide plate; the reflector plate is arranged on one side of the bottom of the light guide plate; the other side of the bottom of the light guide plate is provided with a microstructure which damages a light total reflection condition; one side of the reflector plate connected with the bottom of the light guide plate is provided with a reflection unit with a nonuniform reflection property; and the liquid crystal display device comprises a liquid crystal panel and the backlight module and the backlight module provides plane light required by the liquid crystal panel. The reflection unit with the nonuniform reflection property is arranged on the reflector plate, so that more light nearer to the light source is absorbed or is transferred in the same direction, and further the light is, higher diffusion degree is and the emergent light ray insufficiency of the emergent surface is compensated. The invention can effectively reduce the uniformity requirements of light guide plate.

Description

technical field [0001] The invention relates to a backlight module and a liquid crystal display device. Background technique [0002] As a passive display technology, liquid crystal display needs light to penetrate the liquid crystal layer, and human eyes can observe the image and character information presented by the liquid crystal layer. indicators of uniformity. The current liquid crystal display module has two types of backlight structures: the light source is illuminated from the side, and the backlight is directly illuminated from the bottom. Generally, light sources (cold cathode fluorescent tubes, light-emitting diodes) are distributed on the side, and backlight modules that diffuse light through light guide plates are more commonly used in consideration of cost and thinness. [0003] In a typical side-firing backlight module, the light source is in the form of a straight tube or a one-dimensional linear array. The emitted light is incident from one side of the li...

AI Technical Summary

Problems solved by technology

After the light guide plate is manufactured, the brightness distribution of the specific light source arranged on the exit plane is generally determined. However, if the dots and microstructures are not well designed or the distribution of the light source to the light guide plate is changed, the uniformity of the backlight will be affected. Therefore, the design of the diffuser on the bottom surface of the light guide plate requires high uniformity, accuracy, and molding pass rate, which puts high requirements on the process flow of the light guide plate production. At the same time, the production versatility and pass rate of the light guide plate It is also difficult to guarantee

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