LCD device with alignment films having a pretilt changing charac

Details LCD device with alignment films having a pretilt changing charac LCD device with alignment films having a pretilt changing charac

1995-01-27

1997-09-16

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349133, G02F 11337, G02F 1141

Patent

active

056686153

ABSTRACT:
A liquid crystal display device is constituted by a pair of substrates each having thereon an electrode and a chiral smectic liquid crystal disposed between the substrates so as to assume at least two optically stable states. At least one of the substrates has thereon an alignment film. Undesirable liquid crystal movement in the liquid crystal device is effectively suppressed because the alignment film is provided with a uniaxial aligning treatment direction and also a pretilt-changing characteristic such that it provides a pretilt angle which monotonously changes and is then inverted through 0 degree to a state providing a reverse molecular inclination with respect to the associated substrate. Such a pretilt-changing characteristic is provided, e.g., by rubbing the substrate with a rubbing roller inclined thereto at least two times in normal and reverse directions. As a result, the liquid crystal display device becomes free from deterioration in switching characteristic or coloring due to liquid crystal movement without impairing homogeneous uniform alignment characteristic.

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Nakano et al., Japanese Journal of Applied Physics, v. 19 No. 10 (1980) pp. 2013-2014.

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