A backlight module and its light guide plate

Abstract

A light guide plate (10) used for a backlight unit, comprising a first light inlet side (11) and a second light inlet side (12) of which the width is smaller than that of the first light inlet side (11), first incident light and second incident light are separately imported onto the first light inlet side (11) and the second light inlet side (12) by corresponding light sources, and a plurality of first prisms (21) and second prisms (22) of which the cross sections are trapezoid or triangular or half round are arrayed on the upper surface of the light guide plate (10); long axes of the first prisms (21) are vertical to the first incident light, and long axes of the second prisms (22) are vertical to the second incident light; and a gap exists between the first prisms (21) and between the second prisms (22). The light-emitting efficiency of the light guide plate is improved, the backlight brightness is increased, and meanwhile, in combination with lattice points of the bottom surface of the light guide plate, the uniformity ratio of the backlight brightness and a visual angle can be improved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal displays, in particular to an improved structure of a light guide plate. Background technique [0002] With the development of large-size LCD TVs, ultra-high-definition 4K or even 8K technology, the pixel units of the LCD panel increase, the pixel size decreases, the pixel aperture ratio decreases, and the penetration rate also decreases. [0003] Due to the low transmittance of large-size liquid crystal panels, the required brightness of the backlight also increases accordingly. For large-size side light, the design of the backlight module, if the light is incident on a single long side, due to the current limitations of the brightness and heat dissipation of LED single lamps, and the low penetration rate of large-size high-definition LCD panels, single Long design, when the brightness cannot reach the designed brightness, the current method is usually to choose double short or double lon...

AI Technical Summary

Problems solved by technology

Due to the increase of the light coupling distance, the light coupling efficiency of the light entering the light guide plate is greatly reduced, especially in the models that require a narrow bezel design, in order to avoid light leakage at the edge, a material with low reflectivity is usually added above the light coupling area to reduce light leakage. risk, so that the coupling efficiency is further reduced

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