Patent ID: 8094355

Claim:
A laser projection system comprising: (i) a coherent light source including at least one laser configured to emit an output beam; (ii) a scanning optics, the scanning optics comprising at least one scanning reflector, the scanning reflector positioned in an optical path of the output beam; and (iii) a rotating polygon prism; wherein: (a) the scanning reflector is configured to direct the output beam towards the polygon prism and scan the output beam across a projection surface to generate a projected image comprising successive image frames; and (b) the polygon prism is configured to transmit the scanned output beam through its body, and create a virtual image of the scanning reflector, such that said virtual image of the scanning reflector laterally moves within a plane and is projected onto the projector surface at a different incident angle Θ at each successive image frame such that a different speckle pattern is generated at each successive image frame as said polygon prism rotates, thereby reducing speckle contrast in the projected image at the projection surface.