Patent ID: 6831720
Filing Date: 2004-12-14
Classification: B82Y,C09K,E06B,F24S,G01D,G02B,G02F,Y02E

Abstract:
A wide incident angle reflective broadband polarizer comprising:a first varying pitch helix cholesteric liquid crystal film for reflecting and transmitting circularly polarized light over a broad band of wavelengths, a first constant pitch helix cholesteric liquid crystal film for rotating the elliptical axis of light from the first varying pitch helix cholesteric liquid crystal film, adjacent the first varying pitch helix cholesteric liquid crystal film, a first homeotropic film for compensating the phase of the light from the first constant pitch helix cholesteric liquid crystal film, adjacent the first constant pitch helix cholesteric liquid crystal film such that unpolarized light entering the first varying pitch helix cholesteric liquid crystal film exits the first homeotropic film as circularly polarized light of one handedness for small and large angles of incidence.