Liquid crystal display device and backlight module thereof

Abstract

The invention discloses a backlight module, which comprises a light guide plate, a reflective sheet, a back frame, a printed circuit board and a semiconductor light source, wherein the reflective sheet is arranged below the light guide plate; the back frame comprises a bottom plate and a side plate positioned on the lateral side of the bottom plate; the reflective sheet is arranged on the upper surface of the bottom plate; the light guide plate is arranged on the reflective sheet, and one side edge of the light guide plate is opposite to the side plate of the back frame; one side of the side plate of the back frame is adjacent to the light guide plate, and the printed circuit board is arranged on the side, and comprises a first circuit board part in a vertical direction and a second circuit board part which is horizontally extended from the upper or lower end of the first circuit board part towards the light guide plate; one side of the first circuit board part is adjacent to the light guide plate, and the semiconductor light source is arranged on the side; and one side of each of the first and second circuit board parts faces the semiconductor light source, and the surface of the side is a reflecting surface. The invention also discloses a liquid crystal display device. In such a way, the efficiency of optical coupling between the semiconductor light source and the light guide plate can be well improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a display device and a backlight module thereof. Background technique [0002] In the side-in LED (Light Emitting Diode, light-emitting diode) backlight module, the outgoing light of the LED is coupled into the light guide plate, and then emerges from the surface of the light guide plate through total reflection inside the light guide plate, and then the LED point light source is converted into Surface light source. see figure 1 , figure 1 It is a structural schematic diagram of a backlight module in the prior art. The backlight module 100 adopts a side-light input method, and includes a light guide plate 110 , an LED light source 120 and a printed circuit board 130 . The LED light source 120 is disposed on the printed circuit board 130 adjacent to one side of the light guide plate 110 . Since the outgoing light of the LED light source 120 is emitted in variou...

AI Technical Summary

Problems solved by technology

Since the outgoing light of the LED light source 120 is emitted in various directions before entering the light guide plate 110, part of the outgoing light does not enter the light guide plate 110 due to reflection or refraction, so that the light coupling efficiency of the light guide plate 110 does not reach the optimum. good

[0003] In the prior art, in order to solve the above-mentioned problems, the adopted solution design is to increase the size of the reflector, that is, to extend the reflector under the LED to improve the light coupling efficiency. The factor of thermal expansion exists, which leads to the unstable phenomenon of the improved light coupling efficiency, and the problem that the light coupling efficiency of the light guide plate is not optimal has not been well resolved.

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