SYSTEM AND METHOD FOR REDUCING IMAGE ARTIFACTS IN A PROJECTION DEVICE USING A SCROLLING REFRACTIVE ELEMENT
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United States of America Patent
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Issued Date -
Jul 9, 2009
app pub date -
Jan 8, 2008
filing date -
Jan 8, 2008
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Abandoned
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Abstract
A system and method for reducing speckle and smearing phenomena caused by a coherent light source. The light beam from the coherent light source is preferably refracted by a rotating refractive element. The refracted beam is focused and projected through a light valve by a plurality of optical components. The rotation of the refractive element causes the beam to scroll across the surface of a light receiving element, which reduces the smearing effect. The rotation of the refractive element also causes the propagation path of the beam to vary, causing rays of the light beam to undergo relative phase shift, varying the interference pattern on the light receiving element, resulting in a reduction in the appearance of the speckle phenomenon.
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