Light-emitting diode (LED) backlight module

Abstract

The invention discloses a light-emitting diode (LED) backlight module of a side light source. The LED backlight module comprises a light guide plate and a reflective sheet, wherein the light guide plate is provided with a light entering plane and a light exiting plane, an LED light source is arranged on the side of the light entering plane. The reflective sheet is arranged below the light guide plate, a plurality of blank coatings or black and white color gradient coatings with preset distances among each other are formed on one side of the reflective sheet to lower the reflective light intensity of the light source. The blank coatings or the black and white color gradient coatings are arranged on the LED light position corresponding to the reflective sheet. The width of the blank coatings or the black and white color gradient coatings is larger than that of the light emitting surface of the LED lights. According to the design of the mentioned scheme, the color coatings reaching the reflective sheet are mutually and correspondingly matched with the light LED lights. The color coatings absorb the light entering the reflective sheet, and therefore the uniformity of the light intensity of the emergent light of the backlight module is guaranteed. Further, when the pitches among the LEDs are too large, dark regions are prevented from emerging among the LEDs, and the abnormal optical phenomenon of uneven light and shade of the light guide plate is effectively improved.

Description

technical field [0001] The invention relates to an LED backlight module, in particular to a side-entry LED light source backlight module for a liquid crystal display device. Background technique [0002] In recent years, LED (Light Emitting Diode, light-emitting diode) has been widely used in the field of lighting due to its advantages of no pollution, good color rendering, and energy saving. It has also gradually replaced CCFL (Cold Cathode Fluorescent Lamp, Cold Cathode Fluorescent Lamp) and has become the mainstream backlight. The light source emitted by the LED lamp 1 penetrates the light-incident surface of the light guide plate (LGP) and transmits the light source to the light guide plate. The light source changes the direction of the light source through the dots of the light guide plate to form a surface light source, and then provides the light source required by the liquid crystal panel. . [0003] In the side light LED backlight module, the light source emitted ...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem that in the prior art for the design of side light source LED backlight modules, when the distance (Pitch) between LEDs is too large, there will be dark areas between LED lights, which will lead to uneven brightness and darkness on the light incident surface of the light guide plate. Poor optical quality

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