Patent ID: 8366281

Claim:
A coherent light projection system comprising: a coherent light source system configured at least to emit coherent light; an image forming system configured at least to interact with the coherent light in a manner consistent with image data; a relay system configured at least to form an intermediate image at an intermediate image plane from coherent light output from the image forming system, the intermediate image being an aerial real image; a speckle reduction element located at or substantially at the intermediate image plane; a projection system configured at least to project the intermediate image, as transferred through the speckle reduction element; and a movement-generating system configured to cause motion of the speckle reduction element both in a direction parallel to an optical axis of the projection system and in a direction perpendicular to the optical axis of the projection system, wherein the motion of the speckle reduction element in the direction parallel to the optical axis remains within a depth of focus of the relay system and the projection system.