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US 8,556,431 B2Granted
Apparatus and method for reducing speckle in display of images
AssigneeTexas Instruments Incorporated
InventorsTerry Alan Bartlett, John David Jackson
Life of this patent
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Abstract
An apparatus and method of reducing speckle in projection of images is provided that includes the elements or features of producing a first image and displacing the first image to produce a second image that will reduce speckle relating to the first image when the first image and the second image are displayed on a display medium.
Claims15
A projection display system, comprising:
- a light source for producing a beam of coherent light;
- a spatial light modulator for converting the beam of coherent light into individual image pixels which form an image at a display medium;
- a projection lens system;
- an image-displacement device, positioned between the modulator and at least a portion of the projection lens system, for shifting the converted light beam to sequentially displace pixel positions of the image formed at the display medium by an amount, in a direction and at a frequency for optically dithering the formed images to reduce speckle;
- and
- wherein the defined amount, direction and frequency shifts the converted light beam to displace the pixel positions by one pixel length or less.
3 more elements
Dependencies are inferred from the claim text.