Optical: systems and elements – Polarization without modulation – Polarization by reflection or refraction
Reexamination Certificate
2011-04-19
2011-04-19
Allen, Stephone B (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarization by reflection or refraction
C353S020000, C359S485050, C359S485060
Reexamination Certificate
active
07929208
ABSTRACT:
A complex polarizer system (“cross-polarizer”) including an arrangement of at least three polarizing beam splitting layers P1,P2,P3.P1and P2are arranged such that a beam transmitted by P1is reflected by P2without further polarization rotating components; P3is arranged such that a beam reflected by P1transmits P3without further polarization rotating components. The congeneric processing of the two sub-beams of a beam split at P1(both sub-beams go through a transmission and a reflection) eliminates the intrinsic asymmetries of simple polarizers with respect to purity and folding. Coupling of cross-polarizers results in efficient arrangements of systems which operate with complementarily polarized radiation, e.g. 2-channel image display systems with reflective spatial light modulators (e.g. Liquid Crystal on Silicon displays).
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Bausenwein Bernhard Rudolf
Mayer Max
Allen Stephone B
Chapel Derek S
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