Abstract
A LCoS projection display architecture based on LED illuminator is proposed with simulation analysis and prototype evaluation for both improving the utilization efficiency of light source and adding new capability of high dynamic range in 2D presentation with switchability to 3D function. The light source is divided into two yet identical light paths with orthogonal polarization to illuminate two LCoS panels. The image on both panels are combined and spatially aligned in the projection light path so as to share a single projection lens module. Each of the two illumination light paths has its own intensity control unit so that the brightness of two panel images can be well balanced, especially for the 3D presentation mode. Evaluation on the prototype shows that the each projection pattern can keep the uniformity performance on the screen while the intensity control unit is tuned from fully closed to fully opened. Light utilization efficiency up to 9%.