Invention Patent
AT147519T
未知
- Patent Title:
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Application No.: AT92118521Application Date: 1992-10-29
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Publication No.: AT147519TPublication Date: 1997-01-15
- Inventor: SHINJO KENJI , KITAYAMA HIROYUKI , ASAOKA MASANOBU , TERADA MASAHIRO , YAMADA SYUJI , MIZUNO HIROSHI
- Applicant: CANON KK
- Assignee: CANON KK
- Current Assignee: CANON KK
- Priority: JP31013091 1991-10-30; JP10527292 1992-04-01
- Main IPC: G02F1/1337
- IPC: G02F1/1337 ; G02F1/141 ; G02F1/137
Abstract:
A ferroelectric liquid crystal device showing improved uniform alignment characteristic and switching characteristic is constituted by a pair of an upper substrate and a lower substrate, and a chiral smectic liquid crystal disposed between the upper and lower substrates. Each of the upper and lower substrates has thereon an electrode for applying a voltage to the liquid crystal and a uniaxial alignment film. The alignment films on the upper and lower substrates are provided with uniaxial alignment axes which cross each other so that the direction of crossing of the uniaxial alignment axes from the lower substrate to the upper substrate is identical to the direction of helical twist in cholesteric phase of the chiral smectic liquid crystal, and the chiral smectic liquid crystal is disposed in such an alignment state that the liquid crystal shows a pretilt angle a, a cone angle H pi beta , an inclination angle w of SmC* layer, and an apparent tilt angle ra satisfying relationships of; H pi beta ra > H pi beta /2. The crossing direction may preferably have a polarity (taken as "positive" in clockwise direction and "negative" in anticlockwise direction) which is the same as the polarity of the spontaneous polarization of the liquid crystal.
Information query
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