Display device and optical device

Abstract

Disclosed herein is a display device including, a visual target, and a backlight adapted to illuminate the visual target from the rear, the backlight including, a plurality of first light sources, second light sources, and a light guide plate, wherein the light guide plate has a plurality of projecting portions on a side surface portion thereof upon which the light, produced by the plurality of first and second light sources is incident, the projecting portions being arranged, along the side surface portion and project toward the one side of the given direction, the plurality of first light sources are disposed to be opposed to the tip surfaces of the plurality of projecting portions, and the second light sources are disposed to be opposed to the bottom surfaces of recessed portions formed between the plurality of projecting portions.

1 . A display device comprising:
 a light guide plate to radiate the light, produced by first and second light sources, toward a display surface, wherein   the light guide plate has a plurality of projecting portions at a side portion thereof,   the plurality of first light sources are disposed to be at corresponding surfaces of the plurality of projecting portions, and   the second light sources are disposed at corresponding recessed portions between the plurality of projecting portions.   
     
     
         2 . The display device of  claim 1  further comprising
 a plurality of sensors disposed in a distributed manner at positions on a plane overlapping the light guide plate, the sensors being adapted to detect the light of the second wavelength. 
 
     
     
         3 . The display device of  claim 2 , wherein
 the first wavelength is a visible light wavelength, and   the second wavelength is an invisible light wavelength.   
     
     
         4 . The display device of  claim 1 , wherein
 projections and recesses are formed on the plurality of projecting portions and the bottom surfaces of the recessed portions to scatter light, and   the projections and recesses on the bottom surfaces of the recessed portions are formed smaller than those on the tip surfaces of the plurality of projecting portions.   
     
     
         5 . The display device of  claim 1 , wherein
 a light-scattering substance is mixed in the light guide plate.   
     
     
         6 . An optical device comprising:
 a plurality of first light sources adapted to produce light of a first wavelength;   second light sources adapted to produce light of a second wavelength different from the first wavelength and smaller in number than the first light sources; and   a light guide member adapted to guide the light, produced by the first and second light sources, in a given direction, wherein   the light guide member has a plurality of projecting portions at a side portion thereof upon which the light from the plurality of first light sources and from the second light sources is incident,   the plurality of first light sources are disposed at corresponding surfaces of the plurality of projecting portions, and   the second light sources are disposed at corresponding surfaces of recessed portions formed between the plurality of projecting portions.