Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-11-12
1996-11-19
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 73, 359 82, 359 83, G02F 11335, G02F 11333
Patent
active
055768547
ABSTRACT:
In a liquid crystal light valve projector, a quarter-wave compensator plate is disposed between a polarization plate and a liquid crystal light valve to compensate for polarization irregularities induced by the off-incident reflections in the cone of light projected onto the LCLV. The quarter-wave compensation plate reverses the phase of the P component of said illumination light with respect to said compensator plate by 180.degree. thereby eliminating P-polarization leakage during the dark state of an LCLV projector. The invention also combines the compensator plate with a heat shield and a low stress-optical coefficient counter electrode substrate to reduce the birefringence of the LCLV thereby also minimizing leakage of P-polarized light onto the projection screen during the dark state of the projector.
REFERENCES:
patent: 4071912 (1978-02-01), Budmiger
patent: 4408839 (1983-10-01), Wiener-Avnear
patent: 4466702 (1985-02-01), Wiener-Avnear et al.
patent: 5042921 (1991-08-01), Sato et al.
patent: 5121245 (1992-06-01), Johnson
patent: 5229872 (1993-07-01), Mumola
patent: 5327270 (1994-07-01), Miyatake
patent: 5357370 (1994-10-01), Miyatake et al.
patent: 5446510 (1995-08-01), Mitsutake et al.
patent: 5459593 (1995-10-01), Ootaki
Tl-Technical Information Optical Glass, "The Stress-Optical Coefficient of Optical Glasses", Nr. 15, Aug. 1984.
Edwards Robert
Haggerty Joseph M.
Hollister Roger
Nestorovic Ned
Ruiz Javier A.
Gross Anita Pellman
Hughes-JVC Technology Corporation
Malinowski Walter J.
LandOfFree
Liquid crystal light valve projector with improved contrast rati does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal light valve projector with improved contrast rati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal light valve projector with improved contrast rati will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-544861