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US 9,004,692 B2Granted
Projector having diffusing unit and polarization conversion element
AssigneeSeiko Epson Corporation
InventorKoichi Akiyama
Life of this patent
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Abstract
A projector includes an illumination device having a light source device emitting light, and a polarization conversion element adapted to emit light from the light source device as polarized light, a light modulation device adapted to modulate the light from the illumination device in accordance with image information, and a projection optical system adapted to project the light from the light modulation device, and the illumination device further includes a light diffusing unit disposed in at least one of upstream and downstream of the polarization conversion element.
Claims15
A projector comprising:
- an illumination device including:
- a light source device emitting light,
- a polarization conversion element adapted to emit light from the light source device as polarized light and having a plurality of polarization conversion sections arranged in an arrangement direction, each of the polarization conversion sections having a polarization separation section and a reflecting section, and
- a light diffusing unit disposed in at least one of upstream and downstream of the polarization conversion element and having a plurality of light diffusing sections;
- a light modulation device adapted to modulate light from the illumination device in accordance with image information;
- and
- a projection optical system adapted to project light from the light modulation device,
- wherein a width of each of the light diffusing sections in the arrangement direction is smaller than a width of each of the polarization separation sections in the arrangement direction.
5 more elements
Dependencies are inferred from the claim text.