Illuminating device, electro-optical device, and electronic apparatus
View Patent ↗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.
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, 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 include a light receiving surface which faces the light guide plate and detect 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, and wherein one of the at least two photodetectors is disposed on one of the plurality of end faces and another of the at least two photodetectors is disposed on one of the plate surfaces.
2. The illuminating device according to claim 1 ,
wherein the plurality of photodetectors include at least two photodetectors that have the light receiving surfaces thereof disposed at positions distant from the light incident surfaces by different distances.
3. The illuminating device according to claim 1 ,
wherein the plurality of photodetectors include two photodetectors that have light receiving surfaces thereof that respectively face a central portion and one end portion of the light guide plate in a direction along which the plurality of light sources are arranged, or both end portions of the light guide plate in the arrangement direction, when viewed from the light incident surface.
4. The illuminating device according to claim 1 ,
wherein the light guide plate has a rectangular shape in plan view, and
the plurality of photodetectors include two adjacent photodetectors that have light receiving surfaces that are disposed to face two of the end faces of the light guide plate that are adjacent to each other.
5. The illuminating device according to claim 1 ,
wherein the light source control unit collectively controls the plurality of light sources on the basis of representative values, which are derived from the detection values detected by the plurality of photodetectors.
6. The illuminating device according to claim 1 ,
wherein the light sources control chromaticity of emitted light,
the photodetectors output detection values with which chromaticity of detected light can be derived, and
the light source control unit collectively controls chromaticity of emitted light of the plurality of light sources on the basis of representative values of chromaticity that are derived from the detection values of the plurality of photodetectors.
7. The illuminating device according to claim 1 ,
wherein the light sources control luminance of emitted light,
the photodetectors output detection values with which luminance of detected light can be derived, and
the light source control unit collectively controls luminance of emitted light of the plurality of light sources on the basis of representative values of luminance that are derived from the detection values of the plurality of photodetectors.
8. An electro-optical device comprising:
the illuminating device according to claim 1 ; and
an electro-optical panel that is disposed on a light emitting side of the illuminating device and functions on the basis of illumination light of the illuminating device.
9. An electronic apparatus comprising the electro-optical device according to claim 8 .
10. 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, 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 include a light receiving surface which faces the light guide plate and detect the light from the end faces 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 an output of the plurality of photodetectors,
wherein the plurality of photodetectors include at least two photodetectors disposed on two different end faces of the plurality of end faces.
11. The illuminating device according to claim 10 , wherein the at least two photodetectors are disposed on opposite end faces of the light guide plate, and wherein the at least two photodectectors are not opposed each other.
12. The illuminating device according to claim 10 , wherein the at least two photodetectors are disposed on adjacent end faces of the light guide plate.