Smectic liquid crystal element and manufacturing method thereof

Details Smectic liquid crystal element and manufacturing method thereof Smectic liquid crystal element and manufacturing method thereof

1997-02-19

1998-12-15

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349134, G02F 11337, G02F 1141

Patent

active

058502726

ABSTRACT:
An electrode substrate is placed on a stage heated at temperature in a range of from 50.degree. to 200.degree. C. in such a manner that an alignment film of the electrode substrate faces upwards. Thereafter, a rubbing treatment is applied by a roller having the rubbing cloth wound therearound by moving a stage while rubbing the surface of the alignment film by rotating the roller in a state where the electrode substrate is sufficiently heated. Here, as the alignment film is softened by the described heat treatment, the rubbing process is facilitated. This permits a uniform C2 orientation without defects to be achieved in smectic liquid crystals.

REFERENCES:
patent: 5422748 (1995-06-01), Yamashita et al.
patent: 5646704 (1997-07-01), Kodera
Y. Hanyu, Digest of Liquid Crystal Research Institute for Young Members 43 (1994), pp. 43-46, "Alignment Control of Ferroelectric LCD".
M. Koden, Optronics, 1994, pp. 52-57, "Ferroelectric Liquid Crystal Display".
M. Koden et al., Ferroelectrnics, vol. 149 (1993), pp. 183-192, "Ferroelectric Liquid Crystal Device Using The t-V.sub.MIN Mode".
T. Oh-ide et al., 13th Liquid Crystal Meeting, 1987, pp. 194-195, "Effect of Rubbing Strength on the Molecular Alignment of Liquid Crystals: Cases of N and C*LCs".
H. Sakai et al., 14th Liquid Crystal Meeting, 1988, pp. 146-147, "Uniform Molecular Alignment Control of Ferroelectric Liquid Crystals".
R. Hasegawa et al., Mol. Cryst. Liq. Cryst., 1995, vol. 262, pp. 77-88, "Analysis of Rubbed Polyimide Films By Polarized Infrared Spectroscopy.".

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