Light-conducting board and backlight mould set

Abstract

A light guide late consists of two light incoming surfaces being two opposite surface of light guide plate, one light outgoing surface being adjacent to two light incoming surfaces on top surface of light guide plate and a reflection surface opposite to light outgoing surface and with several microstructure. It features that center between two said light incoming surfaces is used as symmetric axis to arrange said microstructure and their size and density is decreased gradually and symmetrically along direction from center to two light incoming surfaces. A back light module prepared by said light guide plate is also disclosed.

Description

【Technical field】 [0001] The invention relates to a light guide plate and a backlight module used in the field of liquid crystal display, in particular to a side light type light guide plate and a backlight module. 【Background technique】 [0002] The Light Guide Plate (LGP) mainly includes a light incident surface, a reflective surface, an outgoing surface and several sides, and is an important part of a liquid crystal display backlight module. Its function is to guide the light emitted by scattered point light sources (such as light-emitting diodes) or line light sources (such as cold-cathode tubes) to exit from a plane, and at the same time improve the uniformity of the grayscale and brightness of the panel. The light guide plate is generally made of synthetic resin material, and its substrate shape is divided into flat plate type and wedge-shaped curved surface type. [0003] The light entering the light guide plate will propagate in the plate according to the principle ...

AI Technical Summary

Problems solved by technology

However, the height (depth) of the V-shaped bump 42 increases from the center to both sides. This structure is not conducive to precision machining; and the light guide plate of this structure has no angle control function, so it is necessary to add a multi-layer optical film. so that the final outgoing light can be emitted vertically

[0013] As shown in Figure 5, US Patent No. 5,237,641 published on August 17, 1993 discloses a backlight module capable of controlling the angle of outgoing light, which includes a side light source 51 and a light guide plate 52, the light guide plate 52 reflects A multilayer structure is arranged on the surface, and the outermost layer has a V-shaped microstructure 54, but the light guide plate with this multilayer structure is difficult to process and high in cost, which is not conducive to application in liquid crystal displays, and the backlight module has only one side light source, and its Difficult to apply to liquid crystal displays that require high brightness

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