Direct-lighting type backlight module

Abstract

The invention provides a direct-lighting type backlight module which comprises a back plate, a reflector plate, a plurality of light sources, a grid layer and an optical sheet, wherein one end of the reflector plate is connected with the periphery of the back plate so as to form a containing cavity with the back plate; the plurality of light sources and the grid layer are positioned in the containing cavity; the optical sheet is supported at the other end of the reflector plate and covers the containing cavity; the outer surface of the grid layer is a reflecting plane; the grid layer comprises a plurality of diaphragm plates and a plurality of longitudinal diaphragms which are arranged in a criss-cross way to form a plurality of containing squares; and each light source is positioned in one corresponding containing square. According to the direct-lighting type backlight module, since the grid layer changes the light, the light is only transmitted at a lightened part and only few light is diffused to a light source turn-off part, so that a 3D display effect can be enhanced and a 2D display effect is not influenced.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and in particular to a direct-lit backlight module used in a liquid crystal display device. Background technique [0002] The principle of Shutter Glass 3D technology is based on the refresh time of the human eye to the image frequency. By increasing the fast refresh rate of the screen (at least 120Hz), the left and right eyes each refresh the image at 60Hz. The image will make people feel no jitter in the image, and maintain the same frame rate as the 2D video. The audience's two eyes see different images that switch quickly, and create an illusion in the brain, so they can watch the stereoscopic image. . [0003] Because the liquid crystal scanning is carried out row by row, and after the scan is completed, it will not change until the next field signal is sent. Therefore, if the backlight is not controlled, at a certain time point, the image we see is always the previous image and the n...

AI Technical Summary

Problems solved by technology

Even if only one light tube is turned on, the light can spread to the whole area, that is to say, when the lighting of the corresponding area is turned off at a certain point in time and other light sources are kept on, these light sources that are turned on will scatter most of the light to the entire area. The above-mentioned area will affect the black field effect, and then affect the 3D display effect, or even fail to realize the 3D display effect

Images