Monostable ferroelectric active matrix display

A monostable ferroeltric active matrix display comprising a liquid-crystal layer in the form of a monodomain having an unambiguously defined direction of the layer normal z of the smC* phase, wherein the layer normals z and the preferential direction n of the nematic or cholesteric phase (N* phase) form an angle of more than 5°, where the liquid crystal layer is composed of a liquid-crystal mixture of at least 5 compounds, which consists of an achiral base mixture comprising at least one compound from the group (1) consisting of

• (Ia-Ik), and, optionally with the addition at least one compound from the group consisting of (IIa-IIg) or at least one compound from group (iii), and
• at least one chiral component from group (IV)
• (Ia) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ib) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ic) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining subsituients are as defined below
• (Id) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ie) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substiuents are as defined below
• (If) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ig) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ih) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• (Ii) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below
• R1 and R2 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-dryl and one or more H atoms may also be replaced by F with the proviso that R1 and R2 cannot both be hydrogen
• A1, A2, A3 and A4 are, independently of one another, identical or different and are each 1,4-phenylene, unsubstituted, monosubstituted or disubstituted by F or Cl, cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-l-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo-[2.2.2]octane-1,4-diyl, indane-2,6-diyl, naphthalene-2,6-diyl
• M1, M2, M4 and M5 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, (O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that is a single bond when the corresponding index is zero
• (Ik) R1(—A1—M1)a(—A2—M2)b—A3—(M4—A4)c—(M5—A5)d—R2
• where A3 is
• and the remaining substituents are as defined below:
• R1 and R2 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R1 and R2 cannot both be hydrogen
• G1-G2 is —CH═CH— or —CH2CH2—
• n is zero or one
• A1, A2, A3 and A4 are, independently of one another, identical or different and are each 1,4-phenylene, unsubstituted, monosubstituted or disubstituted by F or Cl, or cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F,
• M1, M2, M4 and M5 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, (O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 0≦{a+b+c+d}≦2 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIa) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R2
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each 1,4-phenylene, cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl or bicyclo-[2.2.2]octane-1,4-diyl,
• M7, M8, M9 and M10 are, independently of one another, identical or ,different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIb) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each 1,4-phenylene, unsubstituted or monosubstituted or disubstituted by F or Cl, cyclohexane1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo-[2.2.2]octane-1,4-diyl, indane-2,6-diyl, naphthalene-2,6-diyl
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIc) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each 1,4-phenylene, cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo-[2.2.2]octane-1,4-diyl, indane-2,6-diyl,
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IId) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —H2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each 1,4-phenylene, cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo-[2.2.2]octane-1,4-diyl, naphthalene-2,6-diyl,
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—, —CH2CH2—, —CH2CH2——CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIe) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl,
• (M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIf) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each 1,4-phenylene, cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2ene-1,4-diyl, bicyclo[2.2.2]octane-1,4-diyl
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIg) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl,
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IIh) R3(—A7—M7)a(—A8—M8)b—A6—(M9—A9)c—(M10—A10)d—R4
• where A6 is
• R3 and R4 are, independently of one another, identical or different and are each hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F with the proviso that R3 and R4 cannot both be hydrogen
• A7, A8, A9 and A10 are, independently of one another, identical or different and are each cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl,
• M7, M8, M9 and M10 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2—CH2CH2— or —C≡C—
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero,
• (III) R5(—A11—M11)a(—A12—M12)b—A13
• where A13 is
• and
• X1, X2 and X3 are, independently of one another, identical or different and are each H, Cl, F, OCF2H or CF3 with the proviso that at least one of X1, X2 and X3 is not H,
• R5 is hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F
• A11 and A12 are, independently of one another, identical or different and are each 1,4-phenylene, cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, cyclohex-2-ene-1,4-diyl, 1-alkyl-1-sila-cyclohexane-1,4-diyl, bicyclo[2.2.2]octane-1,4-diyl, indane-2,6-diyl, naphthalene-2,6-diyl,
• M11 and M12 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—O—, —OCH2—, —CH2—O—, —CH2CH2—, —CH2CH2CH2CH2— or —C≡C—
• a and b are each zero or 1 with the proviso that 1≦{a+b}≦2 and the understanding that Mx is a single bond when the corresponding index is zero,
• (IV) R6(—A14—M14)a(—A15—M15)b—(M16—A16)c—(M17—A17)d—M18—R7
• where
• R6 is hydrogen, alkyl or alkyloxy having 2-12 carbon atoms, where one or two —CH2— groups may be replaced by —CH═CH—, —OC(═O)—, —(O═)C—O—, —Si(CH3)2— or cyclopropane-1,2-diyl and one or more H atoms may also be replaced by F
• R7 is a moiety having at least one asymmetric carbon atom which is either part of an alkyl group having 3 to 16 carbon atoms, where one to four —CH2— groups may also be replaced by —O—, —OC(═O)— or —(O═)C—O— and one of the substituents of the asymmetric carbon atom must be —CH3, —CF3, —OCH3, —CH3, Cl or F, or part of a 3- to 7-membered carbocycle, where one or two nonadjacent —CH2— groups may also be replaced by —O— or one —CH2— group may be replaced by —OC(═O)— or —(O═)C—O—,
• A14, A15, A16 and A17 are, independently of one another, identical or different and are each 1,4-phenylene, unsubstituted, monosubstituted or disubstituted by F or Cl, 1,3-phenylene, unsubstituted, monosubstituted or disubstituted by F or Cl, cyclohexane-1,4-diyl, unsubstituted or monosubstituted by F or CN, cyclohex-1-ene-1,4-diyl, 1-fluorocyclohex-1-ene-1,4-diyl, 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-2,6-diyl, naphthalene-2,6-diyl, unsubstituted, monosubstituted or disubstituted by F or CN, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyrazine-2,5-diyl, pyridazine-3,6-diyl, quinoline-2,6-diyl, quinoline-3,7-diyl, isoquinoline-3,7-diyl, quinazoline-2,6-diyl, quinoxaline-2,6-diyl, 1,3-dioxane-2,5-diyl, thiophene-2,4-diyl, thiophene-2,5-diyl, 1,3-thiazole-2,4-diyl, 1,3-thiazole-2,5-diyl, benz-thiazole-2,6-diyl, 1,3,4-thiadiazole-2,5-diyl, piperidine-1,4-diyl or piperazine-1,4-diyl,
• M14, M15, M16 and M17 are, independently of one another, identical or different and are each a single bond, —OC(═O)—, —(O═)C—, —OCH2—, —CH2—O—, CH2CH2—, —CH2CH2—CH2CH2— or
• M18 is a single bond, if the moiety having the asymmetric carbon atom is part of an alkyl chain, and a single bond, —OCH2—, —CH2—O—, —OC(═O)— or C(O═)O—, if the asymmetric carbon atom is part of the carbocycle defined under R7
• a, b, c and d are each zero or 1 with the proviso that 1≦{a+b+c+d}≦3 and the understanding that Mx is a single bond when the corresponding index is zero.