Alignment of ferroelectric liquid crystal devices
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United States of America Patent
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Oct 23, 2001
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N/A
app pub date -
Aug 4, 1998
filing date -
Mar 1, 1996
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Abstract
A liquid crystal device comprises a liquid crystal cell including a layer of ferroelectric smectic liquid crystal material contained between two walls bearing electrodes and surface treated to give both an alignment and a surface tilt to liquid crystal molecules. The material adopts a C.sub.2 rather than a C.sub.1 arrangement by arranging the surface pretilt .xi. and the ratio of azimuthal to zenithal anchoring energies .beta./.alpha. to give a positive energy difference .DELTA.W.sub.s for the liquid crystal director at the surface in the C.sub.1 and C.sub.2 states. Additionally the provision of a C.sub.2 state may be enhanced by allowing the cell to cool from the isotropic phase to a temperature just below a smectic A to chiral smectic phase, then applying 50 Hz ac voltage in the range typically 0.1 to 5 volts rms. across the liquid crystal layer for about 90 seconds, then allowing the cell to cool to ambient temperature.
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