Patent ID: 6793344
Filing Date: 2004-09-21
Classification: H04N

Abstract:
An optical system for projecting an image comprising,a.) a light source providing a near collimated beam of white light, b.) means for converting most of said light into polarized light, c.) means for rotating the polarization direction of a band of green light of the said polarized light by 90â€³ while leaving the polarization direction of the red and blue lights unchanged, and keeping the propagation directions of all the lights the same, d.) a polarizing beam splitter that separates the said green band of light from the rest of the light which is magenta in color into two orthogonal directions, having as well orthogonal polarization directions, e.) two reflective liquid crystal light valves that reflect respectively green and magenta colored lights, wherein said magenta reflective liquid crystal light valve is partitioned into pixels, with red and blue color filters covering alternating pixels, which are electronically controlled independently to produce images in red and blue colors separately, and f.) a projection lens means for projecting the combined magenta and green lights onto a screen.