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US 7,611,247 B2Granted
Illumination aperture for projection display
AssigneeTexas Instruments Incorporated
InventorsSteven M. Penn, D. Scott Dewald, Steven P. Krycho
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;
- 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;
- and
- at least two fold mirrors on said illumination path, said aperture stop located after a fold mirror without any intervening lenses.
5 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;
- 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;
- and
- folding said illumination path at least twice, at least one fold located before said aperture stop without any intervening lenses.
3 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;
- 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;
- and
- at least two fold mirrors on said illumination path, said aperture stop located after a fold mirror without any intervening lenses.
9 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;
- folding said illumination path at least twice, at least one fold located before said aperture stop without any intervening lenses;
- and
- blocking a portion of light passing through said projection lens using an asymmetric aperture stop.
4 more elements
Dependencies are inferred from the claim text.