Patent ID: 8388138

Claim:
A stereoscopic 3D projection apparatus wherein left and right eye stereoscopic images are created using different sets of primary colors, comprising: a polarizing beam splitter having first and second input ports and an output port; at least one polarized light source providing a source, separate from said polarizing beam splitter, of a first light beam having a first state of polarization and containing a first set of primary colors and a source, separate from said polarizing beam splitter, of a second light beam having a second state of polarization and containing a second set of primary colors, wherein said first and second sets of primary colors are different and said first state of polarization and said second state of polarization are different and orthogonal to each other; a first light modulator arrangement for spatially modulating the polarization state of the first light beam to encode a first image thereon in said first set of primary colors, wherein in the encoded beam “on” pixels all have the same polarization state and “off” pixels all have the same polarization state regardless of color; a second light modulator arrangement for spatially modulating the polarization state of the second light beam to encode a second image thereon in said second set of primary colors, wherein in the encoded beam “on” pixels all have the same polarization state and “off” pixels all have the same polarization state regardless of color; said first and second input ports of said polarizing beam splitter being configured to admit said first and second encoded light beams, and wherein light of one polarization state incident on the first port is transmitted to the output port and light of another polarization state incident on the second port is reflected to said output port so that said transmitted and reflected light is combined into a common output beam at said output port; and projection optics for projecting said first and second images contained in said common output beam onto a display screen whereby said first and second images are viewable as a stereoscopic image with color filter glasses.