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Aligning method of liquid crystal, process for producing liquid crystal device, and liquid crystal device produced by the process
| Details |
Inventors: Asao, Yasufumi; Hanyu, Yukio; Sato, Koichi; Terada, Masahiro; Noguchi, Koji;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Wu; Shean C.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
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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DETAILED DESCRIPTION In view of the above-mentioned circumstances, an object of the present invention is to provide an aligning method of a(chiral)smectic liquid crystal capable of alleviating a (layer) compression irregularity in SmA phase on temperature decrease to suppress or minimize an occurrence of an irregularity in device characteristics in SmC* or-SmC.
sub.
A * phase, thereby to realize a liquid crystal device with a large drive margin.
Another object of the present invention is to provide a process for producing the device and a liquid crystal apparatus using the liquid crystal device.
According to a first aspect of the present invention, there is provided an aligning method of a (chiral)smectic liquid crystal, comprising: disposing a(chiral)smectic liquid crystal between a pair of electrode plates, said(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 said 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 A phase (generally chiral smectic (SmC* or SmC.
sub.
A *) phase).
According to a second aspect of the present invention, there is provided a process for producing a liquid crystal device, comprising: injecting a chiral smectic liquid crystal in isotropic phase into a gap between two contacting surfaces of a pair of oppositely disposed electrode plates, said 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 said chiral smectic liquid crystal to a heat treatment including a sequence of cooling from isotropic 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 A phase (generally SmC* or SmC
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