| US 7,515,231 B2 | ||
| Low temperature nematic liquid crystal alignment material and LCD compensator incorporating the liquid crystal alignment material | ||
| Leonard G. Hale, Cambria, Calif. (US); Young J. Chung, Calabasas, Calif. (US); and William J. Gunning, III, Newbury Park, Calif. (US) | ||
| Assigned to Teledyne Scientific & Imaging, LLC, Thousand Oaks, Calif. (US) | ||
| Filed on Sep. 30, 2005, as Appl. No. 11/241,070. | ||
| Prior Publication US 2007/0076150 A1, Apr. 05, 2007 | ||
| Int. Cl. G02F 1/1335 (2006.01) | ||
| U.S. Cl. 349—117 [349/96; 349/127] | 44 Claims |
| 1. A liquid crystal display assembly comprising,
a) a polarizer adjacent a lighting source, said polarizer having an oriented absorption axis,
b) a viewer side analyzer having an absorption axis substantially perpendicular to the oriented absorption axis of the polarizer
adjacent the lighting source,
c) a liquid crystal cell comprising a twisted nematic liquid crystal material between the polarizer and the analyzer, and
d) at least one compensator assembly located between the polarizer and the analyzer, the compensator comprising,
i) a crosslinked polyvinyl alcohol film with a first surface rubbed to create an alignment layer, and
ii) a polymeric nematic liquid crystal film on the alignment layer of the rubbed crosslinked polyvinyl alcohol film, said
rubbed crosslinked polyvinyl alcohol layer causing a pretilt in the polymerized nematic liquid crystal film
wherein the compensator assembly includes a triacetyl cellulose substrate, a second surface of the polyvinyl alcohol film
being in contact with said triacetyl cellulose substrate the triacetyl cellulose substrate having substantially no in-plane
retardance and a negative out-of-plane retardance from about 30 nm to about 120 nm.
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