Dainippon Ink and Chemicals, Incorporated

Dic Corporation

Kawamura Institute of Chemical Research

Other

Sagami Chemical Research Center

Dic Corporation (tokyo)

Masashi Osawa

Sadao Takehara

Kiyofumi Takeuchi

Haruyoshi Takatsu

Tetsuo Kusumoto

Masakazu Kaneoya

Kenta Tojo

Toru Fujisawa

Tadao Shoji

Hiroshi Ogawa

Shinji Ogawa

Takeshi Kuriyama

Makoto Negishi

Kayoko Nakamura

Kiyohumi Takeuchi

Yoshi Arai

Jitsuo Kurokawa

Norie Ishida

Shotaro Kawakami

Tamejiro Hiyama

Hiroyuki Ohnishi

Akiko Nakayama

Hirokazu Yanagihara

Kiyoharu Nishide

Norie Osawa

A liquid crystal composition that has a positive dielectric anisotropy and a sufficiently low viscosity and that causes no display defects when used in liquid crystal display devices is provided without decreasing or increasing the refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature. This liquid crystal composition contains at least one compound selected from compounds represented by general formula (LC0) and at least one compound selected from the group consisting of compounds represented by general formulas (LC1) to (LC5). This liquid crystal composition can be used to provide a reliable liquid crystal display device capable of maintaining a high voltage-holding ratio at high temperatures. This liquid crystal display device is highly practical as a liquid crystal display and is effective in achieving quick response without significantly decreasing the cell gap.

Nematic liquid crystal composition

A liquid crystal composition exhibits a positive dielectric anisotropy and sufficiently low viscosity without decreasing or increasing refractive index anisotropy or nematic phase-isotropic liquid phase transition temperature, and does not cause display failures. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5), in which the liquid crystal composition contains one or more compounds in which at least one of A, A, and Ato Ain general formulae (LC0) to (LC4) represents a tetrahydropyran-2,5-diyl group.

The present invention relates to a nematic liquid crystal composition useful as an electro-optic liquid crystal display material and having a positive dielectric anisotropy (&#x394;&#x2208;). The liquid crystal composition has refractive index anisotropy (&#x394;n) adjusted to a desired level, a sufficiently low viscosity (&#x3b7;), and a positive dielectric anisotropy (&#x394;&#x2208;) while degradation of the temperature range of the nematic phase is avoided by suppressing the decrease in nematic phase-isotropic liquid phase transition temperature (T) and the increase in lower limit temperature of the nematic phase. The liquid crystal composition contains one or more compounds selected from compounds represented by general formula (LC0) and one or more compounds selected from a group of compounds represented by general formula (LC1) to general formula (LC5).

Provided is a liquid crystal composition having a positive dielectric anisotropy, the liquid crystal composition containing two or more compounds selected from compounds represented by general formula (LC0-1) to general formula (LC0-3), and one or more compounds selected from groups of compounds represented by general formula (LC1) to general formula (LC5). The liquid crystal composition has features of a large &#x394;&#x2208; and a low viscosity, and provides a practical, highly reliable liquid crystal display element that can realize low-voltage driving and high-speed response. The liquid crystal composition is useful for an active matrix driving liquid crystal display element. The liquid crystal composition can be applied to a liquid crystal display element of an IPS mode or the like.

There is provided a compound having a good miscibility with another liquid crystal compound and having a combination of a low viscosity (&#x3b7;), high storage stability, and high Teven after being used to produce a liquid crystal composition. In particular, it is a compound having a-fluorophenyloxymethane structure is provided. Since the compound having a-fluorophenyloxymethane structure is highly miscible with another liquid crystal compound, using the compound having a-fluorophenyloxymethane structure as a component of a liquid crystal composition enables a production of a liquid crystal composition which exhibits a liquid crystal phase at low viscosity and in a wide temperature range and which has a high storage stability and enables production of a liquid crystal display device which responds fast and which has excellent display characteristics.

Compound having 2-fluorophenyloxymethane structure

A nematic liquid crystal composition of the present invention is used in liquid crystal display devices of the TN mode, OCB mode, ECB mode, IPS mode, or VA-IPS mode. The liquid crystal composition has positive dielectric anisotropy. Since the refractive index anisotropy and the nematic phase-isotropic liquid phase transition temperature are decreased and the increase in the lower limit temperature of the nematic phase is suppressed, the viscosity of the liquid crystal composition is sufficiently low without degrading the nematic phase temperature range. The liquid crystal composition also offers excellent features such as high-speed response, good display quality, and less display failures and is thus suitable as a practical liquid crystal composition.

The present invention relates to a compound having a 2-fluorophenyloxymethane structure and useful for organic electronic materials and medical and agricultural chemicals, particularly materials for liquid crystal display elements. A problem to be solved by the invention is to provide a compound having relatively large &#x394;&#x2208;, relatively high T, low viscosity (&#x3b7;), and high miscibility with other liquid crystal compounds, and also provide a liquid crystal composition containing the compound as a constituent component. The present invention provides a compound having a 2-fluorophenyloxymethane structure and also provides a liquid crystal composition containing the compound and a liquid crystal display device using the liquid crystal composition.

Disclosed in a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving. Moreover, as shown in the foregoing examples, the naphthalene derivative of the present invention can be easily produced and is colorless and chemically stable. Accordingly, the liquid crystal composition comprising the naphthalene derivative of the present invention is extremely useful as a practical liquid crystal composition, particularly a liquid crystal composition which can operate within a wide temperature range and requires a high speed response and a low voltage driving.

Naphthalene derivative and liquid crystal composition comprising the same

Fluorine-substituted-4-alkenylbenzoic acid and derivatives thereof, and nematic liquid crystal composition containing cyanophenyl benzoate derivatives and liquid crystal display system using the same

Liquid crystal composition

Disclosed is a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving. Moreover, as shown in the foregoing examples, the naphthalene derivative of the present invention can be easily produced and is colorless and chemically stable. Accordingly, the liquid crystal composition comprising the naphthalene derivative of the present invention is extremely useful as a practical liquid crystal composition, particularly a liquid crystal composition which can operate within a wide temperature range and requires a high speed response and a low voltage driving.

A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I):

Disclosed is to provide an azine derivative as a novel liquid crystal compound, a novel process for the preparation of an asymmetrical azine in a high reaction yield with an extremely small amount of by-products such as symmetrical azines, a nematic liquid crystal composition containing the azine derivative which exhibits a broad driving temperature range and an excellent response for the desired high birefringence index, a liquid crystal display device such as TN-LCD, STN-LCD and TFT-LCD having improved electro-optical properties comprising the liquid crystal composition as a constituent material, and a light-scattering type liquid crystal display system which exhibits a suppressed memory phenomenon, a higher uniformity in turbidity for display and improved display properties and response against temperature change while maintaining and improving the required display properties such as fast switching time, lower voltage driving, higher light-control layer resistivity and higher contrast ratio even in the foregoing light-scattering type liquid crystal display system.

Azine derivative, process for the preparation thereof, nematic liquid

A liquid crystal display comprising a compound of the formula ##STR1## wherein each of Y.sup.1 and Y.sup.2 is independently F, Cl, CN, OCN, SCN, OCF.sub.3, OCF.sub.2 H, OCF.sub.2 CF.sub.3, CF.sub.3, R, --OR, --COOR or --OCOR, wherein R is alkyl, alkenyl or alkoxyalkyl, provided that at least one of Y.sup.1 and Y.sup.2 is R, --OR, --COOR or --OCOR; each of Z, Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 is independently a single bond. CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.dbd.C--, --COO--, --OCO--, --CH.sub.2 O--, OCH.sub.2 --, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O-- or --O--(CH.sub.2).sub.3 --: ring A is a group of formula (II): ##STR2## wherein each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, X.sup.6, X.sup.7, X.sup.8, X.sup.9, and X.sup.10 is independently H or D, provided that at least one of them is D; each of rings K, L, J, M and N is independently trans-1,4-cyclohexylene, 1,4-cyclohexenylene, substituted trans-1,4-cyclohexylene, 1,4-phenylene, substituted 1,4-phenylene, 1,3-dioxane-2,6-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyrazine-2,5-diyl or a group of formula (III): ##STR3## wherein each of X.sup.11, X.sup.12, X.sup.13, X.sup.14, X.sup.15, X.sup.16, X.sup.17, X.sup.18, X.sup.19, and X.sup.20 is independently H or D, provided that at least one of them is D; in which the ring of formula (III) may be the same as or different from ring A; and k, l, m, and n each independently is 0 or 1, provided that the sum of k, l, m, and n is 0, 1 or 2. The compound is useful as an electro-optic liquid crystal display material.

Cyclic hydrocarbon derivative and liquid crystal composition containing

A cyclic hydrocarbon derivative represented by formula (I): ##STR1## wherein each of Y.sup.1 and Y.sup.2 is independently F, Cl, CN, OCN, SCN, OCF.sub.3, OCF.sub.2 H, OCF.sub.2 CF.sub.3, CF.sub.3, R, --OR, --COOR or --OCOR, wherein R is alkyl, alkenyl or alkoxyalkyl, provided that at least one of Y.sup.1 and Y.sup.2 is R, --OR, --COOR or --OCOR; each of Z, Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 is independently a single bond, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --COO--, --OCO--, --CH.sub.2 O--, OCH.sub.2 --, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O-- or --O--(CH.sub.2).sub.3 --; ring A is group of formula (II): ##STR2## wherein each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, X.sup.6, X.sup.7, X.sup.8, X.sup.9, and X.sup.10 is independently H or D, provided that at least one of them is D; each of rings K, L, J, M and N is independently trans-1,4-cyclohexylene, 1,4-cyclohexenylene, substituted trans-1,4-cyclohexylene, 1,4-phenylene, substituted 1,4-phenylene, 1,3-dioxane-2,6-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyarazine-2,5-diyl or a group of formula (III): ##STR3## wherein each of X.sup.11, X.sup.12, X.sup.13, X.sup.14, X.sup.15, X.sup.16, X.sup.17, X.sup.18, X.sup.19, and X.sup.20 is independently H or D, provided that at least one of them is D; in which the ring of formula (III) may be the same as or different from ring A; and k, l, m, and n each independently is 0 or 1, provided that the sum of k, l, m, and n is 0, 1 or 2. The compound is useful as an electro-optic liquid crystal display material.

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Kita-adachi-gun, Japan

Masashi Osawa