Patent ID: 7244028

Claim:
A projection display, comprising: at least one laser for delivering a light beam, said light beam of having an original beam divergence and an original coherence radius, and propagating along a beam path; a beam homogenizer; a first lens; a scanning arrangement for scanning said light in beam in a particular pattern over said first lens, such that, averaged over a time less than about the response time of a human eye, said light beam has an effective beam divergence greater than said original divergence thereof, said scanned beam being delivered from said first lens into said beam homogenizer to be homogenized thereby; a spatial light modulator, said spatial light modulator arranged to receive said scanned light beam homogenized by said beam homogenizer and spatially modulate said homogenized scanned light beam in accordance with a component of an image to be displayed; a screen for displaying said image; projection optics for projecting said homogenized scanned light beam onto said screen, said homogenized scanned light beam at said screen having a reduced coherence radius less than said original coherence radius thereof as a result of said scanning thereof, said reduced coherence radius providing a first contribution to minimizing speckle contrast in said image displayed on said screen; and wherein, said screen includes one or more features for providing a second contribution to minimizing speckle contrast in said image displayed thereon.