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US 2003/0147052 A1Published application
High contrast projection
OwnerSteven M. Penn, D. Scott Dewaldinventors
Life of this patent
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Abstract
An optical system and method of increasing the contrast of a projected image. The optical system 1800 comprises a combination of aperture stops 1810, 1812 in at least one of the illumination and projection paths to filter scattered light and/or light prone to scatter into the projection aperture.
Claims37
A display system comprising:
- a light source for providing a beam of light along an illumination path;
- a modulator device on said illumination path for receiving said beam of light and selectively modulating said beam of light along a projection path;
- and
- a lens system on said illumination path, said lens system comprising:
- at least one lens;
- and
- an aperture stop blocking a portion of said beam, said aperture stop forming an aperture that is narrower in a direction toward said projection path than in a direction orthogonal to said projection path.
4 more elements
A method of projecting an image, the method comprising:
- receiving an illumination light beam along an illumination path;
- selectively modulating said illumination light beam along a projection path in response to image data;
- focusing said selectively reflected light using a projection lens;
- and
- blocking a portion of light in said illumination beam using an aperture stop to form an aperture that is narrower in a direction toward said projection path than in a direction orthogonal to said projection path.
2 more elements
A display system comprising:
- a light source for providing a beam of light along an illumination path;
- a modulator on said illumination path for receiving said beam of light and selectively modulating said beam of light along a projection path;
- a lens system on said projection path, said lens system on said projection path comprising:
- at least one projection lens;
- and
- an asymmetric aperture stop receiving light from at least one of said at least one projection lenses;
- and
- a lens system on said illumination path, said lens system on said illumination path comprising:
- at least one lens;
- and
- an illumination aperture stop blocking a portion of said beam, said illumination aperture stop forming an aperture that is narrower in a direction toward said projection path than in a direction orthogonal to said projection path.
8 more elements
A method of projecting an image, the method comprising:
- receiving an illumination light beam along an illumination path;
- selectively modulating said illumination light beam along a projection path in response to image data;
- focusing said selectively modulated light using a projection lens;
- blocking a portion of light in said illumination beam using an illumination aperture stop to form an aperture that is narrower in a direction toward said projection path than in a direction orthogonal to said projection path;
- and
- blocking a portion of light passing through said projection lens using an asymmetric aperture stop.
3 more elements
Dependencies are inferred from the claim text.