Canon Kabushiki Kaisha

Yamakawa Chemical Industry Co., Ltd.

Yoko Yamada

Takashi Iwaki

Takeshi Togano

Takao Takiguchi

Shinichi Nakamura

Hiroyuki Nohira

Shosei Mori

Masanao Kamei

Kazuharu Katagiri

Kenji Shinjo

Hideki Kanazawa

Yuko Etoh

Masahiro Terada

Masataka Yamashita

Ikuo Nakazawa

Tetsuya Abe

Takashi Kimura

Akio Yoshida

Chieko Hioki

Akira Sakaigawa

Masanobu Asaoka

Koji Noguchi

Toshiharu Uchimi

Kazushige Yamagishi

Kazuhige Yamagishi

Yasumasa Tashiro

Yoshio Aoki

A mesomorphic compound of the formula (I) having a coumaran skeleton is suitable as a component for a liquid crystal composition providing improved response characteristics. A liquid crystal device is constituted by disposing the liquid crystal composition between a pair of electrode plates. The liquid crystal device is used as a display panel constituting a display apparatus providing good display characteristics.

Mesomorphic compound, liquid crystal composition, liquid crystal device,

A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a linear or branched alkyl group having 1-18 carbon atoms capable of including one or non-neighboring two or more methylene groups which can be replaced with at least one species of ##STR2## with the proviso that X denotes O or S and Y denotes halogen; R.sub.2 denotes a linear or branched alkyl group having 1-18 carbon atoms; A, B and D independently denote ##STR3## wherein Z.sub.1 and Z.sub.2 independently denote hydrogen, halogen, --CH.sub.3, --CN or --CF.sub.3 ; E denotes --CH.sub.3, --CH.sub.2 F or --CF.sub.3 ; and f and g independently denote 0 or 1. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved response speed and also effective for suppressing occurrence of reverse domain.

A mesomorphic compound represented by: ##STR1## where R.sub.1 and R.sub.2 are alkyl; X.sub.1 and X.sub.3 are a single bond, ##STR2## X.sub.2 is a single bond, ##STR3## A.sub.1, A.sub.2 and A.sub.3 are a single bond, aryl, heteroaryl, pyrimidyl or cyclohexyl, X.sub.4a, X.sub.5a, X.sub.4b, X.sub.5b, X.sub.4c and X.sub.5c are H, F, Cl, Br, --CH.sub.3, --CN or --CF.sub.3 ; and n is 0 or 1.

Mesomorphic compound, liquid crystal composition containing same, liquid

A mesomorphic compound of the formula (I) according to claim 1 is suitable as a component for a liquid crystal composition providing improved response speed and decreased. The mesomorphic compound of the formula (I) is characterized by having at least one terminal cyclic group free from a side chain and also having a core structure including at least one group ##STR1## The above liquid crystal composition is useful as an element of a liquid crystal device and a display apparatus providing a good display characteristics.

Mesomorphic compound, liquid crystal composition containing same, and

An optically inactive mesomorphic compound of the formula (I) according to claim 1 characterized by having a terminal group of: --A.sub.3 --C.sub.r F.sub.2r+1, where A.sub.3 is a specific cyclic group and r is 2-18, is suitable as a component for a liquid crystal composition providing improved response characteristics and a high contrast. A liquid crystal device is constituted by disposing the liquid crystal composition between a pair of electrode plates. The liquid crystal device is used as a display panel constituting a display apparatus (or display method) providing good display characteristics.

Mesomorphic compound liquid crystal composition containing the compound,

A quinoxaline compound of the formula (I) according to claim 1 characterized by having at least one quinoxaline-2,6 (or 2,7)-diyl group is suitable as a component for a liquid crystal composition providing improved response characteristics and a high contrast. A liquid crystal device is constituted by disposing the liquid crystal composition between a pair of electrode plates. The liquid crystal device is used as a display panel constituting a display apparatus providing good display characteristics.

Quinoxaline compound, liquid crystal composition containing the

A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 respectively denote a linear or branched alkyl group having 1-18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with ##STR2## wherein X denotes halogen; X.sub.1 and X.sub.2 respectively denote ##STR3## Z.sub.1 denotes ##STR4## A.sub.1 denotes a single bond, ##STR5## and Y.sub.1 and Y.sub.2 respectively denote H, F, Cl, Br, --CH.sub.3 or --CF.sub.3 with the proviso that Y.sub.1 and Y.sub.2 are not simultaneously H. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.

A mesomorphic compound of the formula (I) according to claim 1 is suitable as a component for liquid crystal composition providing improved response characteristics.

A mesomorphic compound of the formula (I) according to Claim 1 and an optically active compound of the formula (II) according to Claim 2 are suitable as a component for a liquid crystal composition providing improved response characteristics and having an improved helical pitch at a cholesteric phase or a chiral smectic C phase. The above liquid crystal composition is useful as an element of a liquid crystal device providing a good display characteristics including a gradation display.

A liquid crystal composition, comprising: at least one optically active mesomorphic compound having an asymmetric carbon atom to which a fluorine atom is directly bonded.

Fluoroalkane derivative, its composition and liquid crystal device using

A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 respectively denote an alkyl group or alkoxy group each having 4-16 carbon atoms optionally substituted, halogen, --CN or --CF.sub.3. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.

Liquid crystal composition, liquid crystal device, display apparatus and

A mesomorphic compound represented by the following formula (I):

An optically active compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes an alkyl or alkoxy group having 1-18 carbon atoms; R.sub.2 denotes an alkyl group having 1-12 carbon atoms; A denotes ##STR2## X denotes and C* denotes an optically active asymmetric carbon atom. The optically active compound, when included as a component, provides a ferroelectric liquid crystal composition or device showing an improved electro-field response characteristic.

Optically active compound, liquid crystal composition, liquid crystal

A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 respectively denote a linear or branched alkyl group having 1-16 carbon atoms capable of having a substituent; Y.sub.1 denotes --COO--, --OCO--, --CH.sub.2 --or --OCH.sub.2 --; Z.sub.1 denotes a single bond, --O--, --COO--, --OCO-- or --OCOO--; and X denotes a halogen, cyano group or methyl group.

Mesomorphic compound, liquid crystal composition containing same and

1. A mesomorphic compound represented by the following formula 8 I]: ##STR1## wherein R.sub.1 and R.sub.2 respectively denote a straight chain or branch chain allyl group having 1-18 carbon atoms, wherein --CH.sub.2 -- in the alkyl group may be substituted by ##STR2## on condition that hetero atoms are not adjacent each other, R.sup.2 may be hydrogen atom, halogen atom, cyano group and trifluoromethyl group; n is 0 or 1, with the proviso that A.sup.1 denotes a single bond, ##STR3## when n is 0, A.sup.1 denotes a single bond when n is 1; A.sup.2 denotes any one of ##STR4## and X.sup.1, X.sup.2, Z.sup.1 and Z.sup.2 denote independently any one of hydrogen atom, halogen atom, cyano group and trifluoromethyl group, with proviso that X.sup.1, X.sup.2, Z.sup.1 and Z.sup.2 may not be all hydrogen atoms; Y denotes any one of ##STR5## a single bond.

Growing community of inventors

Atsugi, Japan

Yoko Yamada