A kind of led backlight module

Abstract

The invention provides an LED backlight module. The LED backlight module comprises a back plate, an LED lamp strip, a reflection piece, a light guide plate, an optical film set, a radiating assembly, a glue frame and the like. The radiating assembly comprises a first radiating substrate and a second radiating substrate, the first radiating substrate is fixed to the back plate, the second radiating substrate and the first radiating substrate are assembled together through a matched structure, the second radiating substrate can move forwards and backwards in the light incoming side of the light guide plate relative to the first radiating substrate, the LED lamp strip is installed on the second radiating substrate, and a positioning structure is arranged between the second radiating substrate and the light guide plate and is in linkage with the second radiating substrate and the light guide plate. The light mixing distance of the light emitting side of the LED lamp strip and the light incoming side of the light guide plate can keep constant, it is guaranteed that the light guide plate has enough space to extend when expanding, the problem that due to the fact that the light guide plate expands in the high-temperature high-humidity environment during backlight module design of a narrow bezel, the light guide plate bulges in the center direction is solved, and optical homogeneity of the backlight module and the light-incoming efficiency of the LED lamp strip lighting towards the light guide plate are guaranteed.

Description

technical field [0001] The invention relates to a composite movable LED backlight module. Background technique [0002] A liquid crystal display device is composed of two parts, a display device for displaying images - a liquid crystal panel, and a backlight assembly for providing a light source for the liquid crystal panel. Backlight components are divided into direct-type backlight and side-light backlight according to the light-emitting mode. In the side-light backlight module, the main components are: the backplane carrying the optical parts, the heat sink that supports the heat dissipation of the light source LED, and the LED light bar that provides the light source. , reflector, light guide plate, optical film, plastic frame, liquid crystal panel and front frame, etc. In large-size backlight modules, especially TV backlight modules with narrow frames, since the material of the light guide plate PMMA (polymethyl methacrylate) will expand under high temperature and high...

AI Technical Summary

Problems solved by technology

In large-size backlight modules, especially TV backlight modules with narrow frames, since the material of the light guide plate PMMA (polymethyl methacrylate) will expand under high temperature and high humidity environment, when the LED strip is installed on the heat sink and the backlight After the board, in order to ensure the optical uniformity and optical quality of the backlight module, it is necessary to reserve enough space on the light-emitting surface of the LED light bar and the light-incoming side of the light guide plate to absorb the expansion of the light guide plate due to environmental influences and prevent pre-heating. Insufficient clearance will lead to uneven light output from the backlight module caused by the upward arching of the light guide plate, and even the hidden danger of damaging the LCD panel; if the reserved space is too large, it will affect the light input efficiency of the LED light bar to the light guide plate

[0003] In order to make full use of the LED light source, improve the light incident efficiency of the light guide plate emitted by the LED, and ensure a sufficient distance between the light incident side of the light guide plate and the light-emitting surface of the LED, to ensure that the heat generated by the light source LED is released in time, the designer of the backlight module proposes Many solutions have been proposed. This case - a composite LED heat dissipation component and a backlight module using the heat dissipation component - provides a method to ensure the light incident efficiency of the LED light guide plate, and the light guide plate can have enough expansion space in the frame. It solves the problem of poor light caused by the elastic deformation of the light guide plate due to high temperature and high humidity expansion in the narrow frame design of the backlight module, and the problem of low light input efficiency caused by too large reserved space between the light guide plate and the LED light bar

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