Patent ID: 7810977
Filing Date: 2010-10-12
Classification: G02B

Abstract:
1. A backlight device comprising: a plurality of light sources; a main light guide plate that has an introduction surface into which light from the light sources is introduced, a light emitting surface arranged to emit the light from the light sources introduced from the introduction surface to an outside, and an opposed surface in opposition to the light emitting surface; a plurality of auxiliary light guide portions that are disposed as a stack on the main light guide plate on a side of the opposed surface and lead light from any of the plurality of light sources to the introduction surface of the main light guide plate; a reflector arranged to introduce the light from the light sources from the auxiliary light guide portions to the main light guide plate; and an obstructing portion that is disposed inside a space surrounded by the reflector and obstructs an entry of the light that has left one of the auxiliary light guide portions in an inner portion of another of the auxiliary light guide portions.