Patent ID: 7576309
Filing Date: 2009-08-18
Classification: G02B,G09G

Abstract:
1. An illuminating device comprising: a plurality of light sources; a light guide plate that has plate surfaces on front and rear sides and a plurality of end faces formed around the plate surfaces, receives light emitted from the plurality of light sources through a light incident surface, and emits the light through a light-emitting surface, which is one of the plate surfaces; a plurality of photodetectors that each include a light receiving surface which faces the light guide plate and that detects the light from the light guide plate; and a light source control unit that controls light emission of the plurality of light sources on the basis of the output of the plurality of photodetectors, wherein the plurality of photodetectors include at least two photodetectors, one of the at least two photodetectors being disposed on one of the end faces and another of the at least two photodetectors being disposed on one of the plate surfaces.