Patent ID: 6661475
Filing Date: 2003-12-09
Classification: G03B,H04N

Abstract:
A color video image projector, comprising:a light source from which light in first, second, and third wavelength bands propagate; a projection lens; first, second, and third reflective liquid crystal light valves; a plate-type transflective polarizing beam splitter receiving the first, second, and third wavelength bands, transmitting in a first polarization direction the first wavelength band toward the first light valve, and reflecting in a second polarization direction the second and third wavelength bands; a color filter receiving the second and third wavelength bands, transmitting in the second polarization direction the second wavelength band toward the second light valve, and reflecting in the second polarization direction the third wavelength band toward the third light valve; the first, second, and third reflective liquid crystal light valves reflecting the respective first, second, and third wavelength bands of color video image pixels for selective projection through the projection lens depending on whether the pixels are in a dark polarization state or an illuminated polarization state; and a spectrally selective output device disposed between the plate-type transflective polarizing beam splitter and the projection lens to align to substantially a same polarization direction the first, second, and third wavelength bands of light directed toward the projection lens.