Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1996-10-11
1998-12-01
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 33, 349172, 349184, 25229901, G02F 11333, G02F 113
Patent
active
058446516
ABSTRACT:
An object of the present invention is to provide a liquid crystal display device such as an FLC display which is significantly reduced for the temperature dependence of the liquid crystal properties. A liquid crystal optical device 31 in which a plurality of transparent substrates 2a, 2b are opposed to each other at a predetermined gap 32, with transparent electrodes 3a, 3b and liquid crystal alignment films 4a, 4b being disposed, respectively, to the opposing surfaces and ferroelectric liquid crystal (FLC) 30 is disposed in the gap 32, wherein the ferroelectric liquid crystal 30 has a layer texture 30A, and the change of the layer tilt angle is less than 3.degree. within an entire temperature range in the smectic C* phase. An atom group substituted and introduced with a fluorine atom is bonded to a chiral molecular skeleton of a ferro electric liquid crystal molecule, and the atom group substituted and introduced with a fluorine atom has a fluorinated phenylene ring, wherein said liquid crystal material has a uniform texture achieved by applying rectangular electric pulses while slowly cooling from an isotropic phase to a low temperature smectic A phase, followed by application of bipolar electric pulses while cooling to room temperature.
REFERENCES:
patent: 5417883 (1995-05-01), Epstein et al.
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K. Nomura et al., "Electric Field Effect on Layer Structure in Surface-Stabilized Ferroelectric Liquid Crystals", Japanese Journal of Applied Physics, vol. 34, No. 10, Part 1, Oct. 1995, pp. 5689-5693.
N. Shiratori et al., "Effect of Core Structure on Spontaneous Polarization in New Ferroelectric Liquid Crystals with a Fluorinated Chiral Part", Japanese Journal of Applied Physics, vol. 29, No. 11, Part 2, Tokyo, Japan, Nov. 1990, pp. L2086-L2088.
S. Inui et al., "First Order Paraelectric-Antiterroelectric Phase Transition in a Chiral Smectic Liquid Crystal of a Fluorine Containing Phenyl Pyrimidine Derivative", Japanese Journal of Applied Physics, vol. 29, No. 6, Part 2, Tokyo, Japan, pp. L987-L990.
Y. Yamada et al., "Ferroelectric Liquid Crystal Display Using Tristable Switching", Japanese Journal of Applied Physics, vol. 29, No. 9, Part 1, Tokyo, Japan, Sep. 1990, pp. 1757-1764.
Fukushima Akiyuki
Matsui Eriko
Reimer Dirk
Yasuda Akio
Yoshizawa Atsushi
Ngo Julie
Sikes William L.
Sony Corporation
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