Backlight module and liquid crystal display

Abstract

The invention relates to a backlight module and a liquid crystal display. The backlight module comprises at least one point light source and a light guide plate, wherein the light guide plate comprises a light emergent surface, a bottom surface, a light incoming surface, a first lateral surface, a second lateral surface, a first microstructure and a second microstructure, wherein the bottom surface is opposite to the light emergent surface; the light incoming surface is connected with the light emergent surface and the bottom surface; the point light source is configured on a position adjacent to the light incoming surface; the first microstructure is formed on the light incoming surface; the first lateral surface is opposite to the light incoming surface and connected with the light emergent surface and the bottom surface; the second lateral surface is connected with the light emergent surface, the bottom surface, the light incoming surface and the first lateral surface; and the second microstructure is formed on the second lateral surface and used for reflecting incoming light beams incoming into the second microstructure.

Description

technical field [0001] The invention relates to a backlight module and a liquid crystal display including the backlight module. Background technique [0002] figure 1 Shown is a schematic diagram of a conventional backlight module 100 with a point light source as a side light source. like figure 1 As shown, when a point light source 102 (such as a light-emitting diode) is used as a side light source, based on the light output characteristics of the point light source 102, the front end of the light guide plate 104 will generate alternately distributed bright areas (hot spot) HS and dark areas (dark spot) DS, therefore, it is necessary to reserve a large area of ​​light mixing area to uniformly diffuse the light energy, resulting in a significant reduction in the effective uniform light output area of ​​the light guide plate 104 . To solve this problem, as figure 2 As shown, in the design of another existing backlight module 200, the microstructure 106 can be arranged on...

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Problems solved by technology

However, if figure 1 As shown, the side light beam I would originally be reflected by the side edge 104a of the light guide plate and return to the light guide plate 104, however, once figure 2 As shown, due to the light-diffusing effect of the microstructure 106, after the deflection angle of the incident beam is increased, part of the side beam I′ will be refracted out of the light guide plate 104, which not only reduces the light utilization efficiency, but also reduces the light utilization efficiency when refracted out of the light guide plate 104. When part of the lateral light beam I' encounters an external component, such as a plastic frame 108 with a matte reflective material, part of the lateral light beam I' will be reflected by the surface of the plastic frame 108 to form an obvious side bright spot 112

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