SURFACE LIGHT SOURCE DEVICE

摘要

A surface light source device can be configured to increase front luminance as compared to certain conventional light sources. The surface light source device can include a light guiding plate having a first end surface and a second end surface, a light exiting surface formed to have a light exiting portion and a tapered surface disposed opposite to the light exiting surface. A light source can be disposed along the first end surface of the light guiding plate, and a reflection sheet can be disposed on the tapered surface of the light guiding plate. A prism sheet having a prism surface can face toward the light exiting portion of the light guiding plate. The light exiting portion can be disposed a predetermined entrance length away from the first end surface along the light exiting surface so that the light exiting surface can form a predetermined taper angle with the tapered surface.