PROJECTION-TYPE DISPLAY DEVICES WITH REDUCED SPECKLE
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United States of America Patent
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app pub date -
Apr 27, 2007
filing date -
Jul 16, 2003
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Abstract
Described herein are display devices that provide projection-type video output and use lasers to generate light. To reduce any speckle effects for a projected image cast by a projector onto of a non-specular surface, the present invention decreases coherence of the laser-generated light. Coherence reduction is accomplished by introducing a coherence diffuser in a light path of the laser light. Arranging the coherence diffuser in an unfocused light beam reduces both temporal and spatial coherence in the light. Arranging the rotating diffuser at the focus of a beam reduces only the temporal coherence while maintaining the spatial coherence.
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