An optical imaging system including a wide-angle Cartesian polarizing beam splitter, light valve illumination optics having an f/2.5, and at least one reflective light valve. The Cartesian polarizing beam splitter (PBS) has a structural orientation defining fixed polarization axes. The use of a Cartesian...http://www.google.com.au/patents/US6721096?utm_source=gb-gplus-sharePatent US6721096 - Polarizing beam splitter
