Illuminating device, electro-optical device, and electronic...

Details Illuminating device, electro-optical device, and electronic... Illuminating device, electro-optical device, and electronic...

2008-02-04

2009-08-18

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S227140, C315S151000

Reexamination Certificate

active

07576309

ABSTRACT:
An illuminating device includes 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, which is at least one end face among the plurality of end faces, and emits the light through a light-emitting surface, which is one of the plate surfaces, a plurality of photodetectors that are disposed to face the end faces or the plate surfaces of 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. The plurality of photodetectors include at least two photodetectors including light receiving surfaces that face the end faces or the plate surfaces in different directions from each other.

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