| 摘要 |
PROBLEM TO BE SOLVED: To provide an efficient and compact optical system for full color high resolution projection type display using a reflective double-refracting spatial light modulator such as a liquid crystal light valve. SOLUTION: This optical system is provided with reflective double-refracting light valves 26-28, a polarized beam splitter 22, color image coupling prisms 30-32, a lighting system 18, a projection lens 38, color/contrast control filters 43-46 and a screen 39 arranged in constitution to provide an advantage of high resolution color display. This optical system is provided with a quarter wavelength plate 48 arranged to suppress stray reflection from the projection lens 38. This optical system is also provided with a second quarter wavelength plate 50 arranged at the screen 39, and a polarizing film 52 arranged at the second quarter wavelength plate 50 so as to restrain the light in the surroundings from illuminating the screen 39 and entering the optical system. |
