Light guide plate and light incident structure

Abstract

The invention discloses a light guide plate for receiving light from at least one point light source and leading it out. The light guide plate has an effective light exit area and a transition area between the effective light exit area and the point light source. The light guide plate includes: a light incident surface adjacent to the point light source to receive the light emitted by the point light source; a light exit surface forming an included angle with the light incident surface, and the light traveling inside the light guide plate is guided out through the light exit surface; a light reflection surface, the light reflection surface is located on the opposite side of the light exit surface to guide the light entering the light guide plate from the light entrance surface to the light exit surface; and a plurality of light entrance structures are distributed in the transition area of ​​the light guide plate, The front face of each light-incident structure encountering incident light is a cylindrical curved surface, and the curved surface has at least one concave portion that is concave toward the curved surface and points in the opposite direction. The light guide plate and its light incident structure of the present invention have good luminance distribution uniformity and can provide a relatively large area of ​​effective light exit area.

Description

[0001] The present invention is a divisional application with the filing date of March 5, 2008, the application number of 200810082069.8, and the title of the invention "light guide plate and its light incident structure". technical field [0002] The invention relates to a light guide plate and a light incident structure thereof which have a good light diffusing effect and can greatly improve the light incident efficiency. Background technique [0003] General line light sources such as cold cathode fluorescent lamps (cold cathode fluorescent lamps; CCFL) are not suitable for small-sized handheld electronic devices due to their large size. Therefore, a handheld electronic device such as a mobile phone usually uses a point light source as a side light source of its liquid crystal display module. figure 1 It is a schematic diagram of an existing backlight module 100, such as figure 1 As shown, a point light source such as a light-emitting diode (LED) is adjacent to a light i...

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