| 摘要 |
PURPOSE:To improve a light utilization rate by condensing the light from a light source, then spectrally splitting the light to components of respective wavelengths of red, green and blue, modulating the light beams of the respective wavelengths with liquid crystals, reflecting these beams by a reflection plate, then condensing the light beams through the reverse optical paths and utilizing the light beams as display light beams. CONSTITUTION:The light entering from outside is condensed by a convex lens array 11 and is returned to parallel beams by a concave lens array 12. The parallel beams are spectrally split to the RGB components by an R transmission mirror 13 and a B transmission filter 13G. The spectrally split RGB components are made incident on a liquid crystal cell 14, by which the transmittance of the wavelengths of RGB is controlled. The light beams transmitted through the liquid crystal cell 14 are reflected by the reflection plate 15 disposed in the lower part of a cell. The reflected light beams of the respective components pass exactly the reverse routes, i.e., pass the liquid crystal cell 14, the respective arrays 13R, 13G, 13B, the concave lenses 12 and the convex lenses 11 in this order until the light beams are made incident on the reflection plate 15, from which the light beams are projected outside. |
