Hoechst Aktiengesellschaft

Hidemasa Yamaguchi

Ayako Takeichi

Masami Ubukata

Fumie Nozawa

Takamasa Harada

Toshiaki Nonaka

Kazuya Nagao

Haruhiko Itoh

Thoshiaki Nonaka

Kei Li

An improved method for achieving a defect-free and uniform liquid crystal alignment in a process for the production of a ferroelectric liquid crystal display device. A process for producing a ferroelectric liquid crystal display device containing a ferroelectric liquid crystal showing at least an N* phase and an SmC* phase and an organic polymer film or an oblique vapor-deposition film of an inorganic substance serving as an alignment layer is provided by aligning the liquid crystal by cooling the liquid crystal once to a temperature region of a phase which resides in the lower temperature region than the N* phase, and then heating it to a temperature region of an N* phase, or by aligning the liquid crystal by applying an electric field in the N* phase.

Process for producing ferroelectric liquid crystal device

A liquid crystal display device having a liquid crystal material put between a pair of substrates each comprising a transparent electrode and an alignment layer formed thereon in such a manner that the alignment layers are arranged inside so as to face each other, characterized in that at least one of said pair of substrates has an alignment layer formed thereon, which is capable of forming two or more different alignment states of the liquid crystal by an aligning processing in one direction, and at least one of said pair of substrates has an alignment layer formed thereon which generates a pretilt angle of the liquid crystal of at least 2.degree.. The device has a high contrast and less dependency of display characteristics on the viewing angle.

Liquid crystal display device

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 liquid alignment layer characterized by comprising two or more types of polymers wherein a difference between the maximum SP value and the minimum SP value in said polymers being at least 1, and a liquid crystal display device provided with this liquid crystal alignment layer.

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Sayama, Japan

Hidemasa Yamaguchi