Hoechst Aktiengesellschaft

Matsushita Electric Industrial Co., Ltd.

Hoechst Research & Technology Deutschland Gmbh & Co. Kg

Kazuya Nagao

Ayako Takeichi

Rainer Wingen

Gerhard Illian

Hiroyuki Ohnishi

Hidenori Fujiwara

Thoshiaki Nonaka

Kenji Nakao

Tsuyoshi Uemura

Wolfgang Schmidt

Takamasa Harada

Barbara Hornung

Naohide Wakita

Javier Manero

Toshiaki Nonaka

Claus Escher

Shozo Fujiwara

Ingrid Muller

Mikio Murakami

Hubert Schlosser

Dietmar Jungbauer

Masami Ubukata

Fumie Nozawa

Haruhiko Itoh

Hidemasa Yamaguchi

Naomi Takada

Li Ji

Heinz-Joachim Rieger

A ferroelectric liquid crystal mixture having a negative value of &Dgr;e and allowing a high speed response and a low voltage driving, as well as a liquid crystal display devise using the crystal mixture of the invention. The ferroelectric liquid crystal mixture according to the invention comprises two or more compounds from at least two different of the following classes of compounds: A. thiadiazoles, B. phenanthrenes, C. 2-fluoropyridines, D. difluorobenzenes, E. meta-substituted aromatic compounds.

Ferroelectric liquid crystal mixture

Compounds for use in liquid-crystal composition

Electrical addressing of ferroelectric liquid-crystal displays

Novel compounds which increase a response speed of a liquid crystal composition by mixing with a liquid composition are represented by the general formula (I): ##STR1## wherein R represents an alkyl group having from 1 to 10 carbon atoms, X represents a hydrogen atom, a methyl group, an ethyl group or a halogen atom, and Y represents an unsubstituted aromatic heterocyclic ring.

Compound for use in liquid crystal composition, liquid crystal

Disclosed and claimed is a liquid crystal mixture, a liquid crystal device and a display device using the liquid crystal mixture. The liquid crystal display device according to the present invention has improved contrast due to the specific temperature of the liquid crystal mixture. More specifically, the liquid crystal mixture has a temperature range generating a chiral smectic C phase and a temperature range generating a smectic A phase, and having a difference between the cone angle at (T.sub.C/A -10).degree. C. and the cone angle at (T.sub.C/A -40).degree. C. in the temperature range generating the chiral smectic C phase of from zero (0) degree to ten (10) degrees.

Liquid crystal mixture

A ferroelectric liquid crystal display device of the present invention includes: a pair of substrates; a ferroelectric liquid crystal layer provided between the pair of substrates; and an electrode for applying a voltage to the ferroelectric liquid crystal layer, wherein the ferroelectric liquid crystal layer has bent smectic layers, and an effective bend angle .theta.L of the bent smectic layers satisfies the relationship: .theta.Leff&gt;.theta.L&gt;0.degree. in a temperature range in which the ferroelectric liquid crystal display device is stored, where an effective bend angle of the smectic layers in a first state is .theta.Leff, the first state being obtained by cooling the ferroelectric liquid crystal layer from a temperature higher than a phase transition temperature of a chiral smectic C phase--a smectic A phase to a temperature not higher than a phase transition temperature of the chiral smectic C phase--the smectic A phase.

Ferroelectric liquid crystal display device and method for producing the

To provide a liquid crystal display device provided with a liquid crystal alignment layer which is excellent in adhesion to a glass substrate and which has less dependency of display characteristics upon a viewing angle. A liquid crystal display device having a liquid crystal layer between a pair of substrates each comprising a transparent electrode having provided thereon an alignment layer wherein the alignment layers are arranged inside so as to face each other, characterized in that a mixture of a polyamide (A) containing siloxane component as a constituting unit and a polymer (B) having a property of aligning the liquid crystal in such a manner that the direction of a long axis of the liquid crystal molecule projected on the surface of the substrate is different from a rubbing direction is used as an alignment layer material of at least one of the facing surfaces on the pair of substrates.

Liquid crystal display device

Growing community of inventors

Kawagoe, Japan

Kazuya Nagao