Projector having polarization conversion
AssigneeSeiko Epson Corporation
InventorsKoichi Akiyama, Takayuki Matsubara
Life of this patent
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Abstract
A projector includes a solid-state light source that emits linearly polarized light, a birefringence element that converts the linearly polarized light emitted from the solid-state light source into circularly or elliptically polarized light, a diffusion element that diffuses the light having exited from the birefringence element, and a polarization conversion element that separates the diffused light having exited from the diffusion element into first polarized light polarized in a first polarization direction and second polarized light polarized in a second polarization direction, converts the polarization direction of the first polarized light into the second polarization direction, and outputs the resultant first and second polarized light.
Claims12
A projector comprising:
- a solid-state light source that emits linearly polarized light;
- a birefringence element that converts the linearly polarized light emitted from the solid-state light source into circularly or elliptically polarized light;
- a diffusion element that diffuses the light having exited from the birefringence element;
- and
- a polarization conversion element that separates the diffused light having exited from the diffusion element into first polarized light polarized in a first polarization direction and second polarized light polarized in a second polarization direction, converts the polarization direction of the first polarized light into the second polarization direction, and outputs the resultant second polarized light.
A projector comprising:
- a solid-state light source that emits linearly polarized light;
- a diffusion element that diffuses the linearly polarized light emitted from the solid-state light source;
- a birefringence element that converts the diffused light having exited from the diffusion element into circularly or elliptically polarized light;
- and
- a polarization conversion element that separates the light having exited from the birefringence element into first polarized light polarized in a first polarization direction and second polarized light polarized in a second polarization direction, converts the polarization direction of the first polarized light into the second polarization direction, and outputs the resultant second polarized light.
A projector comprising:
- a first solid-state light source that emits first linearly polarized light;
- a second solid-state light source that emits second linearly polarized light;
- a diffusion element that diffuses the first linearly polarized light emitted from the first solid-state light source and the second linearly polarized light emitted from the second solid-state light source;
- and
- a polarization conversion element that separates the diffused light having exited from the diffusion element into first polarized light polarized in a first polarization direction and second polarized light polarized in a second polarization direction, converts the polarization direction of the first polarized light into the second polarization direction, and outputs the resultant second polarized light.
A projector comprising:
- an illuminator that emits light;
- a light modulator that modulates the light emitted from the illuminator,
- a projection system that projects the light emitted from the light modulator,
- wherein the illuminator comprises:
- a solid-state light source that emits linearly polarized light;
- a birefringence element that converts the linearly polarized light emitted from the solid-state light source into circularly or elliptically polarized light;
- a diffusion element that diffuses the light having exited from the birefringence element;
- and
- a polarization conversion element that separates the diffused light having exited from the diffusion element into first polarized light polarized in a first polarization direction and second polarized light polarized in a second polarization direction, converts the polarization direction of the first polarized light into the second polarization direction, and outputs the resultant second polarized light.
Dependencies are inferred from the claim text.