Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1995-12-27
1998-10-27
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 1, 359487, 359494, 359495, 359498, 349 61, 349 64, 349 62, G02B 532, G02B 530, G03H 100, G02F 11335
Patent
active
058284710
ABSTRACT:
An illumination system includes a polarization selective holographic element, which includes at least one optically anisotropic material, arranged to separate light of a first polarization type from light of a second polarization type, and converting section for converting light of at least one of the first and second polarization types to light of a common polarization type. Where the polarization selective holographic element separates two orthogonal components of plane polarized light from one another, the converting section can include a polarization rotator, for example a half wave plate, or alternatively a quarter wave plate and a reflector arranged to reflect light back through the quarter wave plate. Where the polarization selective holographic element separates opposite handed components of circularly polarized light, the converting section can include a reflector.
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Yakolev et al, 13th Intl. Disp. Res. Conf., Aug. 31-Sep. 3, 1993, SID, pp. 17-20, "New Concept to Achieve Color LCDs with linearly Photopolymerized (LPP) LCD-Substrates".
US Application Serial No. 08/525,297, filed Sep. 7, 1995, Walsh et al.
Davis Gillian Margaret
May Paul
Walsh Kathryn
Chang Audrey
Henry Jon W.
Sharp Kabushiki Kaisha
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