Light plate and backlight module based on the light plate

Abstract

The invention provides a light guiding plate and a backlight module which is based on the light guiding plate; the light guiding plate is provided with a light inlet surface, a light outlet surface and a bottom surface, wherein, the bottom surface faces to the light outlet surface; the light inlet surface is connected between the light outlet surface and the bottom surface; the bottom surface or the light outlet surface is provided with a plurality of light guiding units; each light guiding unit is provided with a first curved surface and a second curved surface which are connected with each other; the first curved surface and the second curved surface are concave surfaces or convex surfaces; in a profile which is vertical to the light inlet surface and passes through the first curved surface and the second curved surface, the first curved surface and the profile are crossed at the first curve; the second curved surface and the profile are crossed to a second curve; the radius of curvature of the first curve is more than that of the second curve; the light guiding plate and the backlight module can adjust the light outlet direction of the light beam by controlling the radius of curvature of the first curved surface and the second curved surface of each light guiding unit, thus improving the light outlet efficiency of the light guiding plate further; therefore, the backlight module which uses the light guiding plate has good optical utilization ratio; in another words, the backlight module can provide surface light source with high brightness.

Description

technical field [0001] The invention relates to a surface light source device, and in particular to a backlight module and a light guide plate used in the backlight module. Background technique [0002] With the advancement of flat panel display technology and the advantages of light weight, small size and power saving of flat panel display devices, flat panel display devices have become more and more popular. Common flat panel display devices include liquid crystal display devices, plasma display panels (plasma display panel, PDP), organic light emitting diode display devices (organic light emitting diode display, OLED display) and electrophoretic display devices (electrophoretic display, EPD), among which The penetration rate of liquid crystal display devices is the highest. [0003] The liquid crystal display device includes a liquid crystal display panel (LCD panel) and a backlight module, wherein the backlight module is used to provide a surface light source to the liq...

AI Technical Summary

Problems solved by technology

In addition, the light (such as light 114) transmitted to the sandblasting structure 125 will be diffused, but part of the diffused light (such as light 115) cannot exit from the light-emitting surface 124, so it is known that the light-emitting efficiency of the light guide plate 120 is poor, which will Reduce the light utilization efficiency of the known backlight module 100

In addition, the use of the sandblasting structure 125 will make it difficult to control the light emitting angle, resulting in difficulty in adjusting the brightness and uniformity, and the light emitting surface 124 of the light guide plate 120 is likely to produce obvious bright areas (or bright lines) and dark areas (or dark lines) )

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