Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1996-07-23
1998-11-24
McPherson, John A.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349184, 25229901, G02F 11337
Patent
active
058414975
ABSTRACT:
A liquid crystal device is constituted by a pair of substrates each having thereon an electrode for voltage application, a chiral smectic liquid crystal composition disposed between the substrates so as to assume at least two optically stable states. At least one of the substrates is provided with an alignment control layer having a thickness of at most 200 .ANG. or comprising polyimide. The substrates have been subjected to different aligning treatments at their opposite faces each contacting the composition. The composition comprises at least three fluorine-containing mesomorphic compounds each comprising a fluorocarbon terminal portion and a hydrocarbon terminal portion, the terminal portions being connected with a central core, the compounds having smectic mesophase or latent smectic mesophase; said at least three mesomorphic compounds comprising a compound having a fluorocarbon terminal portion containing one catenary ether oxygen atom, a compound having a fluorocarbon terminal portion containing two catenary ether oxygen atoms, and a compound having a fluorocarbon terminal portion containing three catenary ether oxygen atoms. The above liquid crystal device is effective in improving a duration margin to provide good drive characteristic when driven.
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Sato Koichi
Shinjo Kenji
Terada Masahiro
Yamada Syuji
Canon Kabushiki Kaisha
McPherson John A.
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