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US 5,313,479 AGranted
Speckle-free display system using coherent light
AssigneeTexas Instruments Incorporated
InventorJames M. Florence
Life of this patent
Estimating the term…
Abstract
A speckle-free display system using coherent light is disclosed. The light is directed through a spinning diffusing element to illuminate a spatial light modulator. The spinning element is operable to move the interference patterns around the screen at a speed where it is undetectable to the human eye. The diffusing element is more than likely comprised of ground glass.
Claims15
A speckle-free display system comprising:
- a. at least one coherent light source generating at least one coherent light beam;
- b. a diffusing element located in a plane intercepts said coherent light beam such that light leaves said diffusing element as a diffused light beam which includes interference patterns;
- c. a means for moving said diffusing element in said plane while said diffusing element is intercepting said coherent light beam;
- d. a spatial light modulator for receiving said diffused light beam and for generating an image light beam;
- and
- e. a viewing surface located such that said image bearing light beam impinges thereon to produce a visible image, and wherein said movement of said diffusing element causes said speckle interference pattern to move on said viewing surface so that said speckle pattern is substantially and thereby an improved image is provided.
3 more elements
The method of producing a speckle-free display comprising:
- a. providing at least one coherent light beam;
- b. providing a diffusing element to intercept said at least one coherent light beam such that light leaves said diffusing element as a widened beam of light, said widened beam of light containing interference patterns;
- c. moving said diffusing element while said diffusing element is intercepting said at least one coherent light beam such that said interference patterns move within said widened beam of light;
- d. modulating said widened coherent light beam with a spatial light modulator to form an image bearing light beam;
- and
- e. locating a viewing surface such that said image bearing light beam impinges thereon and produces a visible image, and wherein movement of said diffusing element causes speckle interference patterns to move on said viewing surface so that said speckle patterns are substantially invisible.
3 more elements
Dependencies are inferred from the claim text.