Patent ID: 8089425

Claim:
A display system, comprising: a plurality of lasers forming a laser array to produce a plurality of laser beams, respectively; a scanning module placed in an optical path of the laser beams to scan the laser beams in two orthogonal directions; an afocal optical relay module placed between the lasers and the scanning module having a plurality of lenses to reduce a spacing between two adjacent laser beams of the laser array and to overlap the laser beams at the scanning module, wherein the afocal optical relay module comprises a plurality of first lenses, a second lens; and a third lens, wherein: the plurality of first lenses have first focal lengths and are respectively placed in optical paths of the laser beams, each first lens receives a respective laser beam among the laser beams and focuses the respective laser beam, and each first lens refracts the respective laser beam such that the plurality of laser beams converge toward the second lens after the refraction; the second lens has a second focal length shorter than the first focal lengths and is spaced from the first lenses by the first focal lengths to focus the laser beams from the first lenses; and the third lens has a third focal length longer than the second focal length and is spaced from the second lens by the third focal length to focus and direct the laser beams from the second lens to the scanning module; a screen; a scan lens positioned to receive the laser beams from the scanning module and to project the laser beams onto the screen by imaging the lasers onto the screen; and a Fresnel lens placed in front of the screen to direct light from the scan lens into the screen at a normal incidence.