Surface light source having light guide plate with polygonal cells

摘要

A surface light source ( 100 ) includes a light guide plate ( 20 ) and a pair of point light sources ( 10 ). The light guide plate has an incident surface ( 201 ) and an emitting surface ( 202 ). The point light sources are adjacent the incident surface of the light guide plate, for radiating light beams into the light guide plate through the incident surface. The emitting surface defines a plurality of polygonal cells ( 2020 ). Each of the polygonal cells define a plurality of grooves regularly therein. By the cooperation of the polygonal cells and the point light sources, the surface light source has uniform luminance over the whole emitting surface.