| 摘要 |
In a display system (50) suitable for high ambient light environments, a lamp (54) is used simply as a light source to illuminate a rear projection display screen (58), which is a matrix of tiny cells (60) that modulate the light at video rates. Each cell includes a polymer dispersed liquid crystal (PDLC), a focusing lens (64) and a pinhole aperture (66) in an opaque screen (68). When the PDLC is electrically activated in a scattering mode, light passing through the PDLC is scattered in many directions, and very little light passes through the pinhole aperture and is seen by the viewer. When the PDLC is not electrically activated, light passing through the PDLC is not scattered, the lens of each cell focuses the light through the pinhole aperture, and the viewer sees a bright spot of light. <IMAGE> |
