Light guide plate and backlight module

Abstract

The invention provides a light guide plate and a backlight module. The light inlet surface of the light guide plate is arc-shaped; a first inclined surface and a second inclined surface are respectively arranged on the side, close to the light inlet surface, of the upper surface and the lower surface of the light guide plate, so that light at a large angle can be totally reflected at the first inclined surface and the second inclined surface after the gathering action of the arc-shaped light inlet surface, and enter the light guide plate; the light which enters the light guide plate is emitted out from a light outlet surface after being transferred and reflected; the light utilization rate is improved; the light coupling efficiency is improved. The light guide plate of the structure has a good converging effect on the light at various angles, so that the thickness of a light guide part of the light guide plate can be reduced without losing the light coupling efficiency; the thin-type design of the light guide plate is facilitated. The backlight module provided by the invention adopts the light guide plate of the special structure, so that the backlight module has a smaller thickness and a better light outlet effect.

Description

Technical field [0001] The invention relates to the field of display technology, in particular to a light guide plate and a backlight module. Background technique [0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, and no radiation, and has been widely used, such as: mobile phones, personal digital assistants (PDA), digital cameras, computer screens or notebook computers Screen etc. [0003] Most of the liquid crystal display devices currently on the market are backlight liquid crystal display devices, which include a casing, a liquid crystal panel arranged in the casing, and a backlight module arranged in the casing. The structure of a traditional liquid crystal panel is composed of a color filter substrate (Color Filter), a thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates. The working principle of the struc...

AI Technical Summary

Problems solved by technology

[0007] However, with the deepening of the thinning of the light guide plate, the thickness of the light guide part of the light guide plate becomes thinner and thinner, and the thickness difference between the light incident part and the light guide part of the light guide plate becomes larger, such as figure 2 As shown, the inclination of the first slope 220 becomes larger, so that part of the light with a large angle cannot enter the interior of the light guide plate for recycling, thereby reducing the utilization rate of the light.

In backlight modules that are getting thinner and thinner, more light is lost at the light incident part of the light guide plate, and part of the light will become stray light and enter the optical film area above the light guide plate, resulting in bright edges

Therefore, it is difficult to achieve the ideal light coupling efficiency only by setting the light incident part with a wedge structure in the light guide plate

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