Light conducting plate and back light module

Abstract

The present invention relates to a large-size light-conducting plate used in the liquid crystal display field and backlight module. Said light-conducting plate includes an incident face, an exit face and a reflecting face. Said invention also provides the concrete structure form with several V-type microstructures of said reflecting face, and makes the large-size light-conducting plate be combined with light source to implement the function of traditional backlight module with high luminance and good exiting light uniformity. Said invention also provides the backlight module using said light-conducting plate.

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 large-size 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 prin...

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

[0012] 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 multilayer structure is difficult to process and high in cost, which is not conducive to application in large-size liquid crystal displays

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