Light guide plate and light entrance structures thereof

Abstract

The invention discloses a light guide plate and light entrance structures thereof. The light guide plate comprises a light entrance surface, a light exit surface, a light reflecting surface and a plurality of light entrance structures. The light entrance surface is close to a point light source so as to receive light rays emitted by the point light source, and the light rays advancing in the light guide plate are guided to exit through light exit surface. The light reflecting surface is positioned on the opposite side of the light exit surface to guide the light rays entering the light guide plate from the light entrance surface to the light exit surface. The light guide plate has an effective light exit region, and a transition region between the effective light exit region and the point light source, and the plurality of light entrance structures are distributed in the transition region of the light guide plate. Part of a front side encountering incoming rays of each light entrance structure is an elliptic cylindrical surface having a long axis and a short axis which are different in length. The light guide plate and the light entrance structures of the light guide plate have good brightness distribution uniformity and can provide the large-area effective light exit region.

Description

technical field [0001] 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 [0002] 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 incident side 102 a of the light guide plate 102 , and the bottom surface 102 c of the light guide plate 102 is formed with a prism structure composed of V-shaped grooves 106 . In this existing design, since the relationship ...

Images