LED (light-emitting diode) backlight module

Abstract

The invention relates to an LED (light-emitting diode) backlight module which comprises a light guide plate, an LED lamp bar, a back plate and a heat radiating element, wherein the light incoming side edge of the LED lamp bar, which is close to the light guide plate, is fixed on the heat radiating element; the heat radiating element is provided with a light guide plate positioning post which is relatively fixed on the heat radiating element and extends upward; the light guide plate positioning post penetrates through the light guide plate upward, thus the light guide plate is relatively positioned on the heat radiating element; the heat radiating element is movably arranged on the back plate along the light incoming direction; and the heat radiating element shifts along with the expansion or shrinkage of the light guide plate so as to keep the light coupling distance between the light guide plate and the LED lamp bar. The LED backlight module provided by the invention can prevent the light guide plate from warping caused by mechanism interference after the light guide plate is expanded by heating or moisture absorption, can prevent the light guide plate from being collided with LEDs after the light gudie plate is expanded because of heating or moisture absorption so as to avoid invalidity, and can guarantee the light coupling distance between the light guide plate and the LEDs so as to improve the light coupling efficiency.

Description

technical field [0001] The invention relates to liquid crystal display technology, in particular to an LED backlight module. Background technique [0002] Existing LED backlight modules used in liquid crystal display technology are mainly divided into direct-type backlight modules and side-type backlight modules. For side-lit LED backlight modules, with the continuous improvement of LED efficiency, the design of LED backlights has also continued to evolve, from the initial four-side light input, to double-side light input, to single-side light input, current development and future development. The direction of all will point to the single short side light incident mode. [0003] The side-type LED backlight is to arrange the LED crystal grains around the edge of the LCD panel, and then match the light guide plate, so that when the LED backlight is illuminated in partitions, the light emitted from the edge of the LCD panel passes through the light guide plate (LGP) It is sen...

AI Technical Summary

Problems solved by technology

Such a variation will have two risks: ① LED reliability risk, LED will be damaged by light guide plate; warping

[0008] In the prior art, in order to avoid warping of the light guide plate due to thermal expansion or moisture absorption expansion, it is necessary to reserve enough movement for the light guide plate, so that the distance between the light guide plate and the LED becomes larger, so that the light coupling distance will decrease. reduce, greatly affecting the efficiency of the backlight

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