Backlight module

Abstract

The invention provides a backlight module, which comprises a back plate, a backlight source, a prism and a light guide plate, wherein the backlight source is arranged in the back plate; the prism is arranged on the back plate and is located above the backlight source; the light guide plate is arranged in the back plate; the light guide plate is provided with a light incidence plane; the backlight source is located at one side of the light incidence plane of the light guide plate; the backlight source is provided with a light emergence plane; and light emitted from the light emergence plane enters the light guide plate from the light incidence plane after being refracted by the prism. According to the backlight module provided by the invention, at least one prism is arranged above the backlight source, so that the incidence light is refracted, and further, the vast majority of the light emitted from the backlight source is directly deflected to enter the light guide plate, thereby, the light energy loss is reduced, and the coupling efficiency of the light is increased. Meanwhile, a lateral reflective sheet does not need to be optimized in position and shape in the prior art, thereby, the thickness of the backlight module is reduced and the broader width of the light incidence side of the backlight module is reduced, and a narrow-broader design can be favorably realized.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a backlight module capable of improving light coupling efficiency. Background technique [0002] A liquid crystal display (LCD, Liquid Crystal Display) has many advantages such as a thin body, power saving, and no radiation, and has been widely used. Most of the liquid crystal display devices currently on the market are backlight liquid crystal display devices, which include a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The direction of the liquid crystal molecules is controlled by electrifying or not, and the light of the backlight module is refracted. Come out to generate the picture. Since the liquid crystal panel itself does not emit light, the light source pro...

AI Technical Summary

Problems solved by technology

[0004] However, in this type of side-entry backlight module, most of the light needs to be reflected by the reflector of the backlight cavity before entering the light guide plate. During this process, some light will be reflected or refracted back to the direction of the backlight, thus Absorbed by the backlight package, resulting in reduced light coupling efficiency

In addition, because the existing bottom-side light-emitting side-entry backlight module needs to optimize the shape and position of the side reflector to increase the coupling effect of light, it is not conducive to realizing narrow borders and thinning

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