| 摘要 |
A reflective liquid crystal display overhead projection system (10). The projection system includes a reflective polarizer (18), a phase modulating liquid crystal display (16) on the reflective polarizer, and a fresnel lens (14) on the liquid crystal display. Unpolarized light rays are directed toward the fresnel lens, pass through the liquid crystal display, and are reflected and polarized by the reflective polarizer. The light rays then pass back through the liquid crystal display and the fresnel lens and on toward a projector head (20), where the light rays are analyzed by a polarizer (36) and projected toward a screen (50). |
