| 摘要 |
A laser projection system wherein speckle is suppressed through beam-path displacement, by deflecting the beam during projection, thereby avoiding bot h absorption and diffusion of the beam while preserving pseudocollimation (noncrossing rays). Path displacement is achieved by scanning the beam on liquid crystal light valves (LCLV's) (30), which also provide enhancements - in energy efficiency, brightness, contrast, beam uniformity (by suppressing both laser-mode ripple and artifacts). Preferably deflection is performed by a mirror (20) mounted on a galvanometer or motor (21) for oscillation; images are written incrementally on successive portions of an LCLV control stage while the laser "reading beam" is synchronized on an output stage. Beam splitter analyzer cubes (25) are preferred over polarizing sheets. |
