Chiral smectic device subjected to a simultaneous thermal and AC

Details Chiral smectic device subjected to a simultaneous thermal and AC Chiral smectic device subjected to a simultaneous thermal and AC

1995-11-06

1996-08-06

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 56, 359 76, 359 78, 359100, G02F 113, G02F 11343, G02F 11337

Patent

active

055439438

ABSTRACT:
A ferroelectric liquid crystal device is constituted by disposing a ferroelectric liquid crystal between a pair of substrates having thereon electrodes for voltage application and provided with uniaxial alignment axes, as by rubbing, so as to provide a high pretilt angle of at least 10 degrees. A problematic liquid crystal movement in such a high-pretilt angle ferroelectric liquid crystal device is suppressed by improving a smectic layer structure therein, inclusive of a symmetry of pretilt angles at the pair of substrate boundary surfaces. Such an improved smectic layer structure is accomplished by a realigning treatment after cooling to the chiral smectic phase or in the final stage of the cooling to the chiral smectic phase as by application of an AC electric field and/or by repetitive heating-cooling in the chiral smectic phase. The improved smectic layer structure is represented by, e.g., an X-ray diffraction peak having an increased peak area and/or a decreased half-value width.

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