Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified...
Patent
1998-07-28
2000-07-04
Wu, Shean C.
Stock material or miscellaneous articles
Liquid crystal optical display having layer of specified...
25229901, 349172, 349174, 349184, G02F 11333, C09K 1952
Patent
active
060835745
ABSTRACT:
An aligning method of a chiral smectic liquid crystal includes the steps of: disposing a chiral smectic liquid crystal between a pair of electrode plates, the chiral smectic liquid crystal having a layer spacing-changing characteristic providing a layer spacing which increases on temperature decrease in a first temperature range in smectic A phase; and subjecting the chiral smectic liquid crystal to a heat treatment including a sequence of cooling from a higher temperature phase to a second temperature range in smectic A phase including at least a portion of the first temperature range, at least one cycle of heating and cooling within the second temperature range, and further cooling to a smectic phase lower than smectic phase. The heat treatment, particularly at least one cycle of heating and cooling in smectic A phase, is effective in suppressing an alignment (orientation) irregularity due to the presence of two regions different in characteristics, thus improving a drive margin.
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Asao Yasufumi
Hanyu Yukio
Noguchi Koji
Sato Koichi
Terada Masahiro
Canon Kabushiki Kaisha
Wu Shean C.
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