Liquid crystal cells – elements and systems – Liquid crystal optical element – Passive liquid crystal polarizer
Reexamination Certificate
2005-03-01
2005-03-01
Le, Thien M. (Department: 2876)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Passive liquid crystal polarizer
Reexamination Certificate
active
06862073
ABSTRACT:
Provided is a circularly-polarized-light-extracting optical element adapted to effectively prevent lowering of displaying quality that is brought about by the appearance of bright and dark stripes on the screen of a display even when the circularly-polarized-light-extracting optical element is placed between circular or elliptical polarizers arranged in the cross nicol disposition. The circularly-polarized-light-extracting optical element10includes a liquid crystal layer12having cholesteric regularity with liquid crystalline molecules in planar orientation. The liquid crystalline molecules on a surface12A, which is one of the two main opposite surfaces12A and12B of the liquid crystal layer12,are wholly oriented in substantially one direction (director Da) and the liquid crystalline molecules on the other main surface12B of the liquid crystal layer12are also wholly oriented in substantially one direction (director Db). In the case where the liquid crystal layer12is made of a plurality of liquid crystal layers, it is preferable that the directors in planes in the vicinity of the interface of each two neighboring liquid crystal layers be substantially parallel to each other.
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Dai Nippon Printing Co. Ltd.
Labaze Edwyn
Le Thien M.
Parkhurst & Wendel L.L.P.
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