Liquid crystal cells – elements and systems – Cell containing liquid crystal of specific composition – In smectic phase
Patent
1995-11-02
1998-08-04
Sikes, William L.
Liquid crystal cells, elements and systems
Cell containing liquid crystal of specific composition
In smectic phase
349132, G02F 113, G02F 11337
Patent
active
057902232
ABSTRACT:
A ferroelectric liquid crystal device is constituted by disposing a ferroelectric liquid crystal between a pair of substrates having thereon electrodes for voltage application and provided with uniaxial alignment axes, as by rubbing, so as to provide a high pretilt angle of at least 10 degrees. A problematic liquid crystal movement in such a high-pretilt angle ferroelectric liquid crystal device is suppressed by improving a smectic layer structure therein, inclusive of a symmetry of pretilt angles at the pair of substrate boundary surfaces. Such an improved smectic layer structure is accomplished by a realigning treatment after cooling to the chiral smectic phase or in the final stage of the cooling to the chiral smectic phase as by application of an AC electric field and/or by repetitive heating-cooling in the chiral smectic phase. The improved smectic layer structure is represented by, e.g., an X-ray diffraction peak having an increased peak area and/or a decreased half-value width.
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Hanyu Yukio
Mihara Tadashi
Mori Sunao
Nakamura Katsutoshi
Taniguchi Osamu
Canon Kabushiki Kaisha
Miller Charles
Sikes William L.
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