Aligning method of liquid crystal, production process of liquid

Details Aligning method of liquid crystal, production process of liquid Aligning method of liquid crystal, production process of liquid

1996-01-31

1998-08-25

Wu, Shean C.

Compositions

Liquid crystal compositions

349133, 428 1, C09K 1952, G02F 1141

Patent

active

057980560

ABSTRACT:
An aligning method of a chiral smectic liquid crystal showing a phase transition series of isotropic phase, smectic phase, and chiral smectic phase in this order on temperature decrease is provided. In the aligning method, the chiral smectic liquid crystal is disposed between a pair of electrode plates at least one of which is provided with an alignment control layer, preferably one having been subjected to a uniaxial aligning treatment (e.g., rubbing), and then is subjected to a treatment including a cycle of heating and cooling in temperatures ranging between a lower limit temperature showing chiral smectic phase and an upper limit temperature showing isotropic phase and smectic phase in mixture. The upper limit temperature may preferably be below an isotropic-smectic phase transition temperature by at most 3.degree. C., particularly at most 1.degree. C. The aligning method is effective in improving an alignment characteristic of liquid crystal molecules to provide a uniform alignment state free from an aligning defect.

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Structure and Physical Properties of Ferroelectric Liquid Crystals, Future Liquid Crystal Display and its Materials (1992), 4th Ferroelectric Liq. Crystal Intl. Conf. (1993) p. 46.

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