摘要:
A novel liquid crystalline compound having a low viscosity and a high elastic constant ratio and at the same time, a superior compatibility with other known liquid crystalline compounds, and a liquid crystal composition and a liquid crystal display element containing the novel compound, are provided. The compound is an alkenylcyclohexane derivative expressed by the formula (1): ##STR1## wherein R.sup.1 and R.sup.2 represent a linear or branched alkyl group of 1 to 15 carbon atoms or alkenyl group of 2 to 15 carbon atoms; at least one of R.sup.1 and R.sup.2 represents an alkenyl group; in these groups, one or more non-adjacent CH.sub.2 groups may be replaced by oxygen atom, sulfur atom or --C.tbd.C-- group; ring A.sup.1, ring A.sup.2 and ring A.sup.3 each independently represent 1,4-cyclohexylene group wherein one or more CH.sub.2 groups on the ring may be replaced by oxygen atom or sulfur atom, or 1,4-phenylene group wherein one or more CH groups on the ring may be replaced by nitrogen atom; Z.sup.1 and Z.sup.2 each independently represent --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or single bond; Z.sup.3 represents --(CH.sub.2).sub.4 --, --CH.dbd.CH--(CH.sub.2).sub.2 --, --CH.sub.2 --CH.dbd.CH--CH.sub.2 -- or --(CH.sub.2).sub.2 --CH.dbd.CH--; and m, n and i each independently represent 0 or 1.
摘要:
The present invention provides a liquid-crystalline compound which has a reduced viscosity, a wide liquid crystal temperature range (high clearing point), a high chemical stability (extremely high specific resistance, high voltage holding ratio) and a high solubility with other liquid-crystalline compound(s) and preferably has a proper refractive index anisotropy. The present invention also provides a liquid crystal composition having excellent properties. The liquid-crystalline compound is represented by the following general formula (1): wherein R and R' each independently represents a C.sub.1-20 alkyl or halogenated alkyl group or a group obtained by replacing one or more --CH.sub.2 -- groups in the alkyl group by any of --O--, --S--, --CH.dbd.CH-- or --C.tbd.C--, provided that two or more --CH.sub.2 -- groups are not consecutively replaced by either --O-- or --S--; and Z.sub.1 and Z.sub.2 each independently represents a covalent bond or 1,2-ethylene group, provided that when both Z.sub.1 and Z.sub.2 are a covalent bond, R and R' are not straight-chain alkyl groups each having the same chain length.
摘要:
Liquid crystalline compounds are disclosed which compounds are expressed by general formula (1) ##STR1## wherein R.sub.1 represents an alkyl group having 1 to 10 carbon atoms, ring A represents 1,4-phenylene or 1,4-cyclohexylene, each of X.sub.1, X.sub.2, X.sub.3, and X.sub.4 independently represents hydrogen atom or fluorine atom, Y.sub.1 represents CF.sub.3 or OCF.sub.3, and each of m, n, and p is independently an integer of 1 or 0. The liquid crystalline compounds have a wide temperature. The liquid crystalline compounds have a wide temperature range of nematic phase, low viscosity, large positive .DELTA..epsilon., high chemical stability, high miscibility with other liquid crystalline compounds at low temperatures, small temperature dependency of viscosity and .DELTA..epsilon., extremely high specific resistance (high voltage holding ratio), and good UV stability, and are preferably used for TFT. Also, disclosed are liquid crystal compositions containing the liquid crystalline compounds mentioned above, and liquid crystal display devices using the liquid crystal composition.
摘要翻译:公开了液晶化合物,其中化合物由通式(1)表示,其中R 1表示具有1-10个碳原子的烷基,环A表示1,4-亚苯基或1,4-亚环己基,各自为X1,X2,X3 X 4独立地表示氢原子或氟原子,Y1表示CF 3或OCF 3,m,n和p各自独立地为1或0的整数。液晶化合物的温度宽。 液晶化合物具有宽的向列相温度范围,低粘度,大的正DELTAε,高化学稳定性,低温下与其它液晶化合物的高混溶性,粘度和DELTAε的温度依赖性低,电阻率极高( 高电压保持率),良好的紫外线稳定性,优选用于TFT。 此外,还公开了含有上述液晶化合物的液晶组合物和使用该液晶组合物的液晶显示装置。
摘要:
Liquid crystal compositions which have excellent miscibility at low temperatures, a properly large optical anisotropy, and a small threshold voltage while satisfying various characteristics required of liquid crystal compositions for active matrix mode liquid crystal display devices. The compositions contain, as a first component, at least one compound expressed by any one of formulas ##STR1## and as a second component, at least one compound expressed by any one of formulas ##STR2## wherein R represents a straight chain alkyl group having 1 to 10 carbon atoms, X represents CF.sub.3 or OCF.sub.3, X.sup.2 represents fluorine or OCF.sub.3, each Y represents, independently of each other, a hydrogen or fluorine atom, and m is 1 or 2.
摘要:
Liquid crystalline compounds expressed by the following formula (1), liquid crystal compositions thereof obtained by combination with specified liquid crystal compounds, and liquid crystal display devices using them, wherein, A1, A2, A3 and A4 denote each independently trans-1,4-cyclohexylene group etc.; Z1, Z2 and Z3 denote each independently —(CH2)2— etc.; Q1 and Q2 denote each independently H, F, Cl or Br; Q3 and Q4 denote each independently F, Cl or Br; 1, m and n denote each independently an integer of from 0 to 5; and p and q denote each independently an integer of 0 or 1.
摘要:
Liquid crystal compositions which have a low threshold voltage, excellent miscibility at low temperatures, and a wide range of a nematic phase while satisfying various characteristics required of liquid crystal compositions for active matrix mode liquid crystal display devices. The compositions contain, as a first component, at least one compound expressed by any one of formulas ##STR1## and as a second component, at least one compound expressed by any one of formulas ##STR2## wherein each of the formulas, X represents CF.sub.3 or OCF.sub.3, each Y represents, independently of each other, a hydrogen or fluorine atom, m is 1 or 2, and n is an integer or 1 to 10.
摘要:
Liquid crystalline alkenyl cyclohexane compounds of formula (I) having a nematic phase over a broad temperature range, a higher elastic constant ratio K.sub.33 /K.sub.11 and a lower viscosity, liquid crystal compositions comprising the above compounds and liquid crystal display elements using the liquid crystal compositions. ##STR1## wherein R.sub.1 is an alkyl group of 1-15 carbons, an alkenyl group of 2-15 carbons or an alkyl or alkenyl group in which at least one of non-adjacent methylene groups (--CH.sub.2 --) is replaced by --O--, --S--, --C.tbd.C-- or --COO--; R.sub.2 is a hydrogen atom or an alkyl group of 1-10 carbons; m is 0-5; when m is 2 or more, any one methylene group in --(CH.sub.2).sub.m -- may be replaced by --O--; and the rings A.sub.1, A.sub.2 and A.sub.3 are independently a 1,4-cyclohexylene, a cyclohexene-1,4-diyl or a 6-membered ring group, one or two --CH.sub.2 -- groups in said rings optionally replaced by --O-- or --S--.
摘要:
Disclosed are liquid crystalline compounds which (i) are characterized in that the compounds have a wide temperature range in which the compounds exhibit a liquid crystal phase, are low in viscosity, and have a negative and large &Dgr;&egr;, (ii) are readily mixed with other various liquid crystal materials even at low temperatures, and (iii) are useful as component of liquid crystal compositions suitable both for TFT type display mode and IPS mode; and liquid crystal composition comprising the liquid crystalline compound; the compounds are expressed by the general formula (1) wherein R1 represents an alkyl group having 1 to 15 carbon atoms; ring A1, ring A2, and ring A3 independently represent trans-1,4-cyclohexylene group, trans-1,4-silacyclohexylene group, pyrimidine-2,5-diyl group, pyridine-2,5-diyl group, 1,3-dioxane-2,5-diyl group, tetrahydropyran-2,5-diyl group, 1,3-dithian-2,5-diyl group, or tetrahydrothiopyran-2,5-diyl group, or 1,4-phenylene group in which one or more hydrogen atoms on the six-membered ring may be replaced by a halogen atom; X1, X2, and X3 independently represent —(CH2)4—, —(CH2)3O—, —O(CH2)3—, or single bond; Y1 represents hydrogen atom or an alkyl group having 1 to 15 carbon atoms; m and n are independently 0 or 1; and any atom which constitutes this compound may be replaced by its isotope.
摘要:
The present invention is to provide liquid crystalline compounds having a wide temperature range of a liquid crystal phase, low viscosity, and large ratio of elastic constants; liquid crystal compositions comprising the compound; and liquid crystal display devices comprising the composition; the liquid crystalline compounds being fluoroalkenyl derivatives expressed by the general formula (1) ##STR1## wherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent trans-1,4-cyclohexylene group or 1,4-phenylene group; Z.sub.1, Z.sub.2, and Z.sub.3 independently represent --(CH.sub.2).sub.2 --, --CH.dbd.CH--, --C.ident.C--, or a single bond; Q represents H or F; l is an integer of 1 to 5; m, n, and o are independently an integer of 0 to 5; p and q are independently an integer of 0 or 1; and each element which constitutes the derivatives may be an isotope of the element.
摘要:
The present invention provides liquid crystalline compounds having a high voltage holding ratio and a low threshold voltage, little variation of these properties with temperature change, high &Dgr;n, and good compatibility with other liquid crystal materials particularly under a low temperature; liquid crystal compositions containing these crystalline compounds; and liquid crystal display devices made using these liquid crystal compositions. The liquid crystalline compounds are terphenyl derivatives represented by general formula (1): wherein R represents a straight or branched alkyl group of 1-20 carbon atoms, and any methylene groups (—CH2—) not adjacent each other in each alkyl group may be replaced by oxygen atoms; X is a halogen atom, —OCF3, —OCF2H, —CF3, —CF2H or —CFH2; Y1, Y2, Y3, Y4, Y5 and Y6 independently represents H or F, but at least two of Y1, Y2, Y3 and Y4 represent F; and any atom constituting these compounds may be substituted by its isotope.