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Active matrix display with high contrast, e.g. for notebook PC's, contains a chiral-smectic liquid mixture of compounds with linked aromatic or heteroaromatic rings and special compounds with mesogenic groups
Active matrix display with high contrast, e.g. for notebook PC's, contains a chiral-smectic liquid mixture of compounds with linked aromatic or heteroaromatic rings and special compounds with mesogenic groups
A chiral-smectic liquid crystal mixture for active matrix displays contains compound(s) with 2 linked (hetero)aromatic rings and/or compound(s) with 3 linked (hetero)aromatic rings and 0.1-50 wt% special mesogenic compounds with 1-3 (hetero)aromatic or alicyclic rings linked by single bonds or by ester, alkylene or oxymethylene groups. Active matrix displays containing a chiral-smectic liquid crystal (LC) mixture with the phase sequence I-N asterisk -SmC asterisk , a spontaneous polarisation of less than 40 nC/cm2 in the working temperature range and a pitch of more than 10 microns at at least one temperature in the nematic or cholesteric phase. The LC mixture contains at least one compound of at least two of the types of formula (A), (B) and (C), plus 0.1-50 wt% compound(s) of formula (D) in which R1-R6 = H or 2-18C alk(en)yl (with or without asymmetric carbons and optionally with 1 or 2 non-adjacent CH2 groups replaced by -O- and/or with one CH2 replaced by -C equivalent to C- or -Si(CH3)2- and/or with one or more H replaced by F, and with no adjacent heteroatoms), with the proviso that only one of the groups R1/R2 or R3/R4 or R5/R6 may be hydrogen; Y1-Y6 = -O-, -OCO-, -COO-, -OCOO- or a single bond; Z1 = -OCO- or -COO-; A, B = 1,4-phenylene (optionally substituted with up to 3 F atoms), or pyrimidine-, pyridine- or pyridazine-2,5-diyl (all optionally with one F substituent), with the proviso that one of the rings A, B must be one of the above nitrogen heterocycles; C, D, E = 1,4-phenylene (optionally F-substituted as above), with the proviso that at least one of these rings is fluoro-1,4-phenylene or ortho-difluoro-1,4-phenylene; F, G, K = as for A and B and with the same proviso; R20, R21 = (a) 2-12C alkyl, alkenyl, alkoxy or alkenyloxy (optionally with 1 or 2 non-adjacent CH2 replaced by -OCO-, -COO-, -Si(CH3)2- or cyclopropane-1,2-diyl and optionally with one or more H replaced by F), or (b) a group with at least one asymmetric C atom, which is either part of a 3-16C alkyl group, in which 1-4 non-adjacent CH2 may be replaced by -O-, -OCO- or -COO- and one of the substituents on the asymmetric C must be CH3, CF3, OCH3, Cl, F, CN or OCF3, or part of a 3- to 7-membered carbocycle in which 1 or 2 non-adjacent CH2 may be replaced by -O- or one CH2 may be replaced by -OCO- or -COO-, with the proviso that a group of type (b) is in at least one of the groups R20 and R21, and M18 or M19 is a single bond if the group with the asymmetric C is an alkyl group; A14-A17 = 1,4- or 1,3-phenylene (both optionally substituted with 1 or 2 F or Cl), 1,4-cyclohexylene (optionally with one F or CN), cyclohex-1-ene-1,4-diyl or its 1-fluoro derivative, cyclohex-2-ene-1,4-diyl, 2-oxocyclohexane-1,4-diyl, 2-cyclohexen-1-one-3,6-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo(2.2.2)octane-1,4-diyl, spiro(4.5)decane-2,8-diyl, spiro(5.5)undecane-3,9-diyl, indane-2,5-diyl, naphthalene-2,6-diyl (optionally with 1 or 2 F or CN groups), pyrimidine-, pyridine- or pyrazine-2,5-diyl (all optionally with one F), pyridazine-3,6-diyl, quinoline-2,6- or -3,7-diyl, isoquinoline-3,7-diyl, quinazoline- or quinoxaline-2,6-diyl, 1,3-dioxan-2,5-diyl, thiophen-2,4- or -2,5-diyl, 1,3-thiazole-2,5- or -2,4-diyl, isoxazole-3,5-diyl, benzothiazole-2,6-diyl (optionally with one or more F), 1,3,4-thiadiazole-2,5-diyl, piperidine-1,4-diyl or piperazine-1,4-diyl; M14-M17 = -OCO-O-COO-, -OCH2-, -CH2O-, -CH2CH2-, -(CH2)4-, -C equivalent to C- or a single bond; M18, M19 = -OCO-, -COO-, -OCH2-, -CH2O- or a single bond; a, b, c, d = 0 or 1; (a+b+c+d) = 1-3; (A asterisk -M asterisk ) = a single bond if the corresponding index is zero . An Independent claim is also included for LC mixtures as defined above.
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机译：用于有源矩阵显示器的手性-近晶液晶混合物包含具有2个连接的（杂）芳环的化合物和/或具有3个连接的（杂）芳环的化合物和0.1-50 wt％的特殊介晶化合物，其中1通过单键或通过酯，亚烷基或甲醛连接的-3（杂）芳族或脂环族环。有源矩阵显示器，包含手性-近晶液晶（LC）混合物，相序为IN星号-SmC星号，在工作温度范围内自发极化小于40 nC / cm 2，间距大于10微米在向列相或胆甾相中至少有一个温度。该LC混合物包含至少一种式（A），（B）和（C）的至少两种类型的化合物，以及0.1-50wt％的式（D）的化合物，其中R 1 -R 6 ＝ H或2-18C烷（烯）基（具有或不具有不对称碳，并且任选地具有被-O-取代的1或2个不相邻的CH 2基团和/或具有被取代为-C的-C取代的一个CH 2。 C-或-Si（CH 3）2-和/或一个或多个H被F取代且没有相邻的杂原子），但前提是基团R 1 / R 2或R < 3 / R 4或R 5 / R 6可以是氢; Y 1 -Y 6 ＝ -O-，-OCO-，-COO-，-OCOO-或单键; Z 1 ＝ -OCO-或-COO-; A，B = 1,4-亚苯基（可选地最多被3个F原子取代）或嘧啶-，吡啶-或哒嗪-2,5-二基（均可选地带有一个F取代基），条件是环A，B必须是上述氮杂环之一; C，D，E ＝ 1，4-亚苯基（任选地如上所述被F-取代），条件是这些环中的至少一个是氟-1，4-亚苯基或邻二氟-1，4-亚苯基; F，G，K =与A和B相同，但条件相同; R 20，R 21 ＝（a）2-12C烷基，链烯基，烷氧基或链烯氧基（任选被1个或2个不相邻的CH2取代为-OCO-，-COO-，-Si（CH3）2- ;或环丙烷-1,2-二基，并且任选地一个或多个H被F取代;或（b）具有至少一个不对称C原子的基团，其为3-16C烷基的一部分，其中1- 4个不相邻的CH2可以被-O-，-OCO-或-COO-取代，不对称C上的取代基之一必须是CH3，CF3，OCH3，Cl，F，CN或OCF3或3的一部分到7元碳环，其中1个或2个不相邻的CH2可以被-O-取代，或者一个CH2可以被-OCO-或-COO-取代，条件是存在（b）类型的基团如果具有不对称C的基团为烷基，则R 20和R 21以及M 18或M 19中的至少一个为单键。 A 14 -A 17 ＝ 1，4-或1，3-亚苯基（均任选被1或2个F或Cl取代），1，4-亚环己基（任选地具有一个F或CN），环己-1 -烯-1,4-二基或其1-氟衍生物，环己-2-烯-1,4-二基，2-氧代环己烷-1,4-二基，2-环己烯-1-一-3,6-二基，1-烷基-1-sila-环己烷-1,4-二基，双环（2.2.2）辛烷-1,4-二基，螺（4.5）癸烷-2,8-二基，螺（5.5）十一烷-3 ，9-二基，茚满-2,5-二基，萘-2,6-二基（可选带有1个或2个F或CN基），嘧啶，吡啶或吡嗪-2,5-二基（全部可选带有一个F），哒嗪-3,6-二基，喹啉-2,6-或-3,7-二基，异喹啉-3,7-二基，喹唑啉或喹喔啉-2,6-二基，1,3-二恶烷- 2,5-二基，噻吩-2,4-或-2,5-二基，1,3-噻唑-2,5-或-2,4-二基，异恶唑-3,5-二基，苯并噻唑-2， 6-二基（任选地具有一个或多个F），1,3,4-噻二唑-2,5-二基，哌啶-1,4-二基或哌嗪-1,4-二基; M 14 -M 17 ＝ -OCO-O-COO-，-OCH 2-，-CH 2 O-，-CH 2 CH 2-，-（CH 2）4-，-C等价于C-或单键; M 18，M 19 ＝ -OCO-，-COO-，-OCH 2-，-CH 2 O-或单键; a，b，c，d = 0或1; （a + b + c + d）= 1-3; （星号-M星号）=如果相应的索引为零，则为单键。对于上述LC混合物也包括独立权利要求。
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