Chiral smetic LCD with small pretilt angle, substrate rubbed in

Details Chiral smetic LCD with small pretilt angle, substrate rubbed in Chiral smetic LCD with small pretilt angle, substrate rubbed in

1994-10-05

1996-10-22

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 76, 359 78, 359100, G02F 11337, G02F 113

Patent

active

055682952

ABSTRACT:
A liquid crystal device is constituted by a pair of substrates, and a chiral smectic liquid crystal assuming at least two stable states disposed between the two substrates. At least one of the substrates is subjected to a uniaxial aligning treatment in two directions including a normal direction and a reverse direction substantially opposite to the normal direction. The liquid crystal is placed in an alignment state such that the liquid crystal provides an apparent tilt angle .theta.a which is a half of an angle between said two stable states, a tilt angle H and a pretilt angle .alpha. with respect to a substrate surface, and forms smectic layers forming an inclination angle .delta. from a normal to the substrate surfaces satisfying: H/2<.theta.a.ltoreq.H and H>.alpha.+.delta.. According to the liquid crystal device, an undesirable liquid crystal molecular movement along the substrates is effectively suppressed.

REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4886619 (1989-12-01), Janulis
patent: 5172255 (1992-12-01), Brosig et al.
patent: 5422748 (1995-06-01), Yamashita et al.
Becker et al., "Alignment Properties of Rubbed Polymer Surfaces", vol. 132, 1986, Molecular Crystals and Liquid Crystals, pp. 167-180. (No Month).
Patel et al., "A Reliable Method of Alignment for Smectic Liquid Crystals", vol. 59, Ferroelectrics, 1984, pp. 137-144. (No Month).

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