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US 7,583,875 B2Granted
Illumination device, image display device, and projector
AssigneeSeiko Epson Corporation
InventorsTaisuke Yamauchi, Takashi Takeda
Life of this patent
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Abstract
An image display device includes: a first face; a laser light source device emitting laser light; and a diffractive optical element on which the laser light emitted from the laser light source device is incident, generating diffracted light from the incident laser light, and illuminating the first face with the diffracted light, the first face is provided at a position on which zero-order light emitted from the diffractive optical element is not incident, and an image is displayed by light via the first face.
Claims16
An image display device comprising:
- a spatial light modulation device having a first face and modulating light illuminated on the first face in accordance with an image signal;
- a laser light source device emitting laser light;
- and
- a diffractive optical element on which the laser light emitted from the laser light source device is incident, generating diffracted light from the incident laser light, and illuminating the first face of the spatial light modulation device with the diffracted light, wherein
- the first face of the spatial light modulation device is provided at a position on which zero-order light emitted from the diffractive optical element is not incident, and an image is displayed by light via the first face.
2 more elements
An illumination device comprising:
- a first face including a predetermined illumination region;
- a laser light source device emitting laser light;
- and
- a diffractive optical element, on which the laser light emitted from the laser light source device is incident, including a plurality of reentrant portions which are two-dimensionally formed on a surface of the diffractive optical element and in which depths of the reentrant portions that are adjacent in a longitudinal direction and in a lateral direction are mutually different, generating diffracted light from the incident laser light, illuminating on the predetermined illumination region of the first face with the diffracted light, and providing uniform illumination in the illumination region.
1 more element
Dependencies are inferred from the claim text.