SEMICONDUCTOR LIGHT-EMITTING DEVICE ILLUMINATED PROJECTION DISPLAY WITH HIGH GRAYSCALE RESOLUTION

摘要

A video display includes a semiconductor light-source, a pixilated spatial light modulator (SLM) for spatially modulating light from the light source and projection optics for projecting spatially modulated light from the spatial light modulator onto the screen to form the video. A desired relative brightness contribution in the display of a pixel element of the SLM is achieved by varying the power output of the light-source over a refresh-period and switching the pixel element to an on-state for a predetermined portion of the refresh-period.