Patent ID: 6962414
Filing Date: 2005-11-08
Classification: H04N

Abstract:
1. A color projection display device for displaying a temporally-integrated color image comprising first and second sequences of temporally-integrateable primary color image components, the device comprising: a first spatial light modulator panel comprising a first array of pixel elements; a second spatial light modulator panel comprising a second array of pixel elements; first driving circuitry which receives a first input signal representing said first sequence of temporally-integrateable primary color image components and selectively activates said first array of pixel elements to produce a first sequence of reflective patterns corresponding to said first sequence of temporally-integrateable primary color image components, each pattern in said first sequence of reflective patterns adapted to receive p-polarized incident light and to reflect corresponding s-polarized light; second driving circuitry which receives a second input signal representing said second sequence of temporally-integrateable primary color image components and selectively activates said second array of pixel elements to produce a second sequence of reflective patterns corresponding to said second sequence of temporally-integrateable primary color image components, each pattern in said second sequence of reflective patterns adapted to receive s-polarized incident light and to reflect corresponding p-polarized light; an illumination unit which generates a non-polarized, substantially white, light beam; a first polarized beam splitter which separates the non-polarized light beam into a substantially white p-polarized light beam and a substantially white s-polarized light beam; a first color switching mechanism which sequentially interposes each of a first set of primary color filter segmentsinm the path of said substantially white p-polarized light beam to produce a sequence of p-polarized colored light beams whose colors correspond to the colors of said first sequence of temporally-integrateable primary color image components; a second polarized beam splitter which transmits said sequence of p-polarized colored light beams onto said first spatial light modulator panel, receives a sequence of patterned s-polarized colored light beams reflected from said first spatial light modulator panel, each patterned s-polarized colored light beam carrying one primary color image component in said first sequence of temporally-integrateable primary color image components, and deflects said sequence of patterned s-polarized colored light beams; a second color switching mechanism which sequentially interposes each of a second set of primary color filter segments in the path of said substantially white s-polarized light beam to produce a sequence of s-polarized colored light beams whose colors correspond to the colors of said second sequence of temporally-integrateable primary color image components; a third polarized beam splitter which deflects said sequence of s-polarized colored light beams onto said second spatial light modulator panel, receives a sequence of patterned p-polarized colored light beams reflected from said second spatial light modulator panel, each patterned p-polarized colored light beam carrying one primary color image component in said second sequence of temporally-integrateable primary color image components, and transmits said sequence of patterned p-polarized colored light beams; and a fourth polarized beam splitter which transmits the sequence of patterned p-polarized colored light beams transmitted by said third polarized beam splitter and deflects the sequence of patterned s-polarized colored light beams deflected by said second polarized beam splitter, thereby to produce a combined output beam carrying both said first sequence and said second sequence of temporally-integrateable primary color image components.