摘要:
A liquid crystalline compound represented by Formula (1c′): wherein R1 and R2, rings A1, A2, A3, A4 and A5, Z1, Z2, Z3 and Z4, Y1, Y2, Y3 and Y4, and k, l, m and n are as defined in the specification. Also provided is a liquid crystal composition containing at least one of these liquid crystalline compounds.
摘要:
Provided are liquid crystalline compounds having a wide liquid crystal phase temperature range, low viscosity, a large elastic constant ratio K33/K11 and excellent solubility at low temperature, a liquid crystal composition using the same and a liquid crystal display. Preferred compounds are difluorovinyl compounds represented by Formula (1): wherein Y1, represents H or a straight chain or branched alkyl group having 1 to 10 carbon atoms, and optional —CH2— in the above alkyl group may be replaced by —O— or —CH═CH—, but —O— is not adjacent to each other, and at least one H in Y1 may be substituted with halogen or a cyano group: A1, A2, A3 and A4 each independently represent 1,4-cyclohexylene in which optional —CH2— which is not adjacent to each other may be replaced by —O—, 1,4-phenylene in which optional H may be substituted with halogen, and a single bond, in which at least two of A1, A2, A3 and A4 have the ring structure described above, and at least one of them is 1,4-cyclohexylene in which —CH2— is replaced by —O—; Z1, Z2 and Z3 each independently represent a single bond, —(CH2)2—, —CH═CH—, —(CH2)4—, —O(CH2)3— or —(CH2)3O—; n represents 0 or an integer of 1 to 10, provided that when any of A1, A2, A3 and A4 is 1,4-phenylene, Z1, Z2 and Z3 are single bonds, and among them, when A1 is 1,3-dioxane-2,5-diyl and A2 is 1,4-phenylene and when A3 is 1,4-cyclohexylene and A4 is a single bond, Y1 is H, and n is not 0.
摘要:
Liquid crystalline compounds are disclosed which have large dielectric anisotropy and relatively low viscosity, and which are represented by formula (1) wherein R1 represents hydrogen or C1-C15 alkyl in which one or more non-adjacent methylene may be replaced by oxygen, sulfur or —CH═CH— and one or more hydrogen may be replaced by halogen; R2 represents hydrogen, cyano, halogen or C1-C15 alkyl in which one or more non-adjacent methylene may be replaced by oxygen, sulfur or —CH═CH— and one or more hydrogen may be replaced by halogen; L represents halogen or hydrogen; A1, A2, A4 and A5 each independently represent trans-1,4-cyclohexylene or 1,4-phenylene, one or more —CH2— in the trans-1,4-cyclohexylene may be replaced by oxygen or sulfur, one or more ═CH— in the 1,4-phenylene may be replaced by nitrogen, and one or more hydrogen in the 1,4-phenylene ring may be replaced by halogen; A3represents trans-1,4-cyclohexylene in which one or more —CH2— may be replaced by oxygen or sulfur; Z1,Z2,Z3 and Z4 each independently represent —COO—, —OCO—, —CH2CH2—, —(CH2)4—, —CH2O —, —OCH2—, —CF2O—, —OCF2— or a single bond; Q represents —CF2CH2— or —CH2CF2—; and k, l, m and n each independently represent 0 or 1 with the condition of k+l+m+n≦2. Further, liquid crystal compositions comprising at least one liquid crystalline compound of formula (1) and liquid crystal display devices composed of the compositions are disclosed.
摘要:
An object of the invention is to propose diamino compounds expressed by the following general formula (1) which are suitable to obtain a raw material, a polyimide resin, for a liquid crystal aligning film without any image sticking and with a high voltage holding ratio at from a low temperature to a high temperature as well as the preparation thereof: ##STR1##
摘要:
A liquid crystal composition containing a first component (I), a second component ((II-1) or (II-2)), a third component ((III), (IV) or (V)), and a fourth component ((VI) or (VII)): ##STR1## wherein the variables are defined in the specification.
摘要:
A liquid crystal composition having a low threshold voltage and a suitably large optical anisotropy, while retaining a high specific resistance value, is provided,which composition is composed of compounds expressed by the formulas (1), (2) and (4): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.4 each represent an alkyl group of 1 to 10C; n represents 0 or 1; A.sup.1, A.sup.2, A.sup.3 and A.sup.4 represent trans-1,4-cyclohexylene or 1,4-phenylene; Z.sup.1, Z.sup.3 and Z.sup.4 represent --C.sub.2 H.sub.4 -- or a single bond; and X.sup.1, X.sup.4 and X.sup.5 represent H or F,use of which composition can realize an active matrix type liquid crystal display element of a low drive voltage, a low power consumption and a high speed response.
摘要翻译:提供具有低阈值电压和适当大的光学各向异性同时保持高电阻值的液晶组合物,该组成由式(1),(2)和(4)表示的化合物组成:本文 R1,R2和R4各自表示1〜10的烷基; n表示0或1; A1,A2,A3和A4表示反式-1,4-亚环己基或1,4-亚苯基; Z 1,Z 3和Z 4表示-C 2 H 4 - 或单键; X1,X4和X5表示H或F,使用哪种组合可以实现低驱动电压,低功耗和高速响应的有源矩阵型液晶显示元件。
摘要:
Disclosed are liquid crystal compositions each comprising a first component (formula (I)), a second component (formula (II)), a third component (formulae (III) to (V)) and a fourth component (formulae (VI) and (VII)): ##STR1## R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.9 each are a C.sub.1-8 alkyl; n, m, p, q and r each are 0 or 1; R.sub.8 and R.sub.10 each are a C.sub.1-8 alkyl or alkoxy, or a C.sub.2-8 alkoxymethyl; A.sub.1 is a 1,5-cyclohexylene, 1,4-phenylene or 1,3-dioxane-2,5-diyl; A.sub.2 and A.sub.5 each are a 1,4-cyclohexylene, 1,4-phenylene or pyrimidine-2,5-diyl; A.sub.3, A.sub.4, A.sub.6 and A.sub.7 each are a 1,4-cyclohexylene or 1,4-phenylene; Z.sub.1, Z.sub.3 and Z.sub.6 each are --COO-- or a single bond; Z.sub.2 and Z.sub.4 each are --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH-- or a single bond; Q and Z.sub.5 each are --CH.sub.2 CH.sub.2 -- or a single bond; L, X and T each are F or H; S is F, Cl or CF.sub.3. Also provided are electro-optical display devices containing any of these compositions, which have rapid response and can be driven even at a low voltage. The temperature-dependence of the driving voltage for the devices is reduced.
摘要:
A liquid crystal composition used for a display element using TN (twisted nematic) mode or STN (super-twisted nematic) mode, having reduced threshold voltage and temperature dependency is provided,which composition is constituted by the following formulas (1) and (2): ##STR1## wherein R.sup.1 and R.sup.2 are an alkyl group of 1 to 10C; A.sup.1 and A.sup.2 each independently are 1,4-cyclohexylene or 1,4-penylene;n is 0 or 1; and X is H or F, andwhen the liquid crystal composition of the present invention is used, it is possible to realize a liquid crystal display element superior in low voltage drive, low power consumption and contrast.
摘要:
Provided is a liquid crystal composition for active matrix addressed display mode which comprises: a first component consisting of at least one compound expressed by formula (I) and a second component consisting of at least one compound selected from the group consisting of compounds expressed by formula (II), (III) or (IV): ##STR1## wherein R.sup.1 and R.sup.2 each represent independently an alkyl group of 1 to 10 carbon atoms in which one or two non-adjacent methylene group(s) may be substituted by an oxygen atom; R.sup.3 represents an alkyl group of 1 to 10 carbon atoms; Z.sup.0, Z.sup.1 and Z.sup.2 each represent independently --CH.sub.2 CH.sub.2 13 or a single bond; and Q.sup.0 represents H or F; Q.sup.1 and Q.sup.2 each represent independently H, F or Cl; L.sup.1 and L.sup.2 each represent independently H or F; X represents F, Cl, CF.sub.3, OCF.sub.3, CHF.sub.2, OCHF.sub.2, OCF.sub.2 Cl or OCF.sub.2 CHFCF.sub.3 ; and n represents an integer of 1 or 2.
摘要:
Novel liquid crystal compound having a negative and absolutely large value of dielectric anisotropy, being excellent in compatibility with other liquid crystalline compounds at a low temperature and being stable chemically and physically, as well as a liquid crystal composition comprising this compound, and a liquid crystal display device comprising this liquid crystal composition are provided, said compound is expressed by the general formula (1): R1—A1—B1—A2—B2—A3—B3—Z—B4—A4—R2 (1) wherein A1, A2, A3 and A4 represent a single bond, 1,4-cyclohexylene, 1,4-phenylene which may be substituted with a fluorine atom(s) or the like; B1, B2, B3 and B4 represent a single bond, 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene, oxymethylene, methyleneoxy or the like; R1 and R2 represent an alkyl group having 1 to 10 carbon atoms or the like; and Z represents (I) to (VI): wherein X represents H or F, and Y represents difluoromethyl group, difluoromethoxy group, formyl group or carboxyl group.