Liquid-crystalline medium and liquid-crystal display comprising the same

Abstract

The invention relates to a liquid-crystalline medium, having particular dielectric properties, in that it has: either a dielectric constant perpendicular to the director (.sub.) in the range of 2 or more to less 8 or less and at the same time a ratio of the dielectric constant perpendicular to the director (.sub.) to the dielectric anisotropy (), i.e. (.sub./) of 1.0 or more or or a dielectric constant perpendicular to the director (.sub.) of 8 or more and a dielectric anisotropy () of 26 or less and
preferably comprises one or more compounds having a high dielectric constant perpendicular to the director (.sub.) and a high average dielectric constant (.sub.av.). These compounds are suitable for use in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect.

Claims

1. A liquid-crystalline medium having a nematic phase and a dielectric anisotropy () of 0.5 or more, said medium having (a) a dielectric constant perpendicular to the director (.sub.) in the range of 2 or more to 8 or less and at the same time a ratio of the dielectric constant perpendicular to the director (.sub.) to the dielectric anisotropy (), (.sub./), of 1.0 or more, or (b) a dielectric constant perpendicular to the director (.sub.) of 8 or more and a dielectric anisotropy () of 26 or less; and wherein said medium comprises one or more compounds having a high dielectric constant perpendicular to the director (.sub.) and a high average dielectric constant (.sub.av.), which are compounds of formula I, ##STR00333## in which ##STR00334## denotes ##STR00335## ##STR00336## denotes ##STR00337## n denotes 0 or 1, R.sup.11 and R.sup.12 independently of each other denote alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy, each having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, and R.sup.11 alternatively denotes R.sup.1 and R.sup.12 alternatively denotes X.sup.1, R.sup.1 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, and X.sup.1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy, the latter four groups having 1 to 4 C atoms.

2. The medium according to claim 1, wherein said medium has a dielectric constant perpendicular to the director (.sub.) in the range of 2 or more to less 8 or less and at the same time a ratio of the dielectric constant perpendicular to the director (.sub.) to the dielectric anisotropy () of 1.0 or more.

3. The medium according to claim 1, wherein said medium has a dielectric constant perpendicular to the director (.sub.) of 8 or more and a dielectric anisotropy () of 26 or less.

4. The liquid-crystalline medium according to claim 3, wherein said medium has a ratio of the dielectric constant perpendicular to the director (.sub.) to the dielectric anisotropy () of 1.0 or more.

5. The liquid-crystalline medium according to claim 1, wherein said medium has a dielectric constant perpendicular to the director (.sub.) of 20 or less.

6. The liquid-crystalline medium according to claim 5, wherein said medium comprises one or more compounds having a high dielectric constant perpendicular to the director (.sub.) and a high average dielectric constant (.sub.av.).

7. The medium according to claim 1, wherein the total concentration of the compounds of formula I in the medium as a whole is 1% or more to 60% or less.

8. The medium according to claim 1, wherein said medium further comprises one or more chiral compounds.

9. An electro-optical display or electro-optical component comprising a liquid-crystalline medium according to claim 1.

10. The display according to claim 9, wherein said display is based on the IPS- or FFS mode.

11. The display according to claim 9, wherein said display contains an active-matrix addressing device.

12. A method of generating an electro-optical effect comprising applying voltage to a display according to claim 9.

13. The display according to claim 9, wherein said display is a mobile display.

14. A process for the preparation of a liquid-crystalline medium according to claim 1, comprising mixing one or more compounds of formula I with one or more additional mesogenic compounds.

15. The medium according to claim 1, wherein said medium has an average dielectric constant (.sub.av.(.sub.+2.sub.)/3) in the range from 8.0 or more to 25.0 or less.

16. The medium according to claim 15, wherein said medium has an average dielectric constant (.sub.av.(.sub.+2.sub.)/3) in the range from 8.5 or more to 20.0 or less.

17. The medium according to claim 15, wherein said medium has a dielectric constant perpendicular to the director of the liquid crystal molecules (.sub.) of 5.0 or more to 8 or less.

18. The medium according to claim 1, wherein said medium further contains: one or more dielectrically positive compounds selected from the compounds of formulae II and III ##STR00338## in which R.sup.2 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, ##STR00339## on each appearance, independently of one another, denote ##STR00340## L.sup.21 and L.sup.22 denote H or F, X.sup.2 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, m denotes 0, 1, 2 or 3, R.sup.3 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, ##STR00341## on each appearance, independently of one another, are ##STR00342## L.sup.31 and L.sup.32, independently of one another, denote H or F, X.sup.3 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, Z.sup.3 denotes CH.sub.2CH.sub.2, CF.sub.2CF.sub.2, COO, trans-CHCH, trans-CFCF, CH.sub.2O or a single bond, and n denotes 0, 1, 2 or 3.

19. The medium according to claim 1, wherein said medium has a dielectric ratio (.sub./) of 1.5 or more.

20. The medium according to claim 18, wherein said medium has a dielectric constant perpendicular to the director of the liquid crystal molecules (.sub.) of 9 or more.

21. The medium according to claim 18, wherein said medium further contains one or more dielectrically neutral compounds selected from the compounds of formulae IV and V: ##STR00343## in which R.sup.41 and R.sup.42, independently of one another, denote alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, ##STR00344## independently of one another and, if ##STR00345## occurs twice, also these independently of one another, denote ##STR00346## Z.sup.41 and Z.sup.42, independently of one another and, if Z.sup.41 occurs twice, also these independently of one another, denote CH.sub.2CH.sub.2, COO, trans-CHCH, trans-CFCF, CH.sub.2O, CF.sub.2O, CC or a single bond, p denotes 0, 1 or 2, R.sup.51 and R.sup.52, independently of one another, denote alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, or alkoxyalkyl, alkenyl or alkenyloxy having 2 to 7 C atoms, ##STR00347## if present, each, independently of one another, denote ##STR00348## Z.sup.51 to Z.sup.53 each, independently of one another, denote CH.sub.2CH.sub.2, CH.sub.2O, CHCH, CC, COO or a single bond, and i and j each, independently of one another, denote 0 or 1.

22. The medium according to claim 18, wherein said medium contains one or more dielectrically negative compounds selected from the compounds of formulae VI to IX: ##STR00349## wherein R.sup.61 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkenyl radical having 2 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, R.sup.62 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, and l denotes 0 or 1, R.sup.71 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms, R.sup.72 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, and ##STR00350## denotes ##STR00351## R.sup.81 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms, R.sup.82 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, ##STR00352## denotes ##STR00353## Z.sup.8 denotes (CO)O, CH.sub.2O, CF.sub.2O or CH.sub.2CH.sub.2, o denotes 0 or 1, R.sup.91 and R.sup.92 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, ##STR00354## denotes ##STR00355## p and q independently of each other denote 0 or 1.

23. The medium according to claim 1, wherein said one or more compounds of formula I are selected from the compounds of formulae I-1 to I-4: ##STR00356## in which R.sup.11 and R.sup.12 independently of each other denote alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, R.sup.1 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, and X.sup.1 denotes F, Cl, CN, NCS, fluorinated alkyl having 1 to 4 C atoms, fluorinated alkenyl having up to 4 C atoms, fluorinated alkoxy having 1 to 4 C atoms, or fluorinated alkenyloxy having up to 4 C atoms.

Description

EXAMPLES

(1) The following examples explain the present invention without restricting it in any way. However, the physical properties make it clear to the person skilled in the art what properties can be achieved and in what ranges they can be modified. In particular, the combination of the various properties which can preferably be achieved is thus well defined for the person skilled in the art.

COMPOUND EXAMPLES

(2) Exemplary compounds having a high dielectric constant perpendicular to the director (.sub.) and a high average dielectric constant (.sub.av.) are exemplified in the following compound examples.

Compound Examples 1.1 and 1.2

(3) Compounds of formula I-1 are e.g.

(4) ##STR00327##

(5) This compound (CK-3-F) has a melting point of 85 C., a of 8.4 and an .sub.av. of 13.4.

(6) ##STR00328##

(7) This compound (CK-5-F) has a phase sequence of K 74 C. N (63.7 C.) l, a of 7.8 and an .sub.av. of 12.2.

Compound Example 2

(8) A compound of formula I-2 is e.g.

(9) ##STR00329##

(10) This compound (YG-2O-F) has a melting point of 69 C., a of only +1.0 and an .sub.av. of already 13.4.

Compound Examples 3 and 4

(11) Compounds of formula I-3 are e.g.

(12) ##STR00330##

(13) This compound (B-2O-O5) has a melting point of 57 C., a of 13.7 and an .sub.av. of even 17.9.

(14) ##STR00331##

(15) This compound (B-4O-O5) has similar preferably properties.

Compound Example 5

(16) A compound of formula I-4 is e.g.

(17) ##STR00332##

(18) This compound (B-5O-OT) has a melting point of 64 C., a of only 3.7 and an .sub.av. of even 18.6.

MIXTURE EXAMPLES

(19) In the following are exemplary mixtures disclosed.

Example 1

(20) The following mixture (M-1) is prepared and investigated.

(21) TABLE-US-00007 Mixture 1 Composition Compound Concentration No. Abbreviation /% by weight 1 CY-3-O4 14.0 2 CK-3-F 6.0 3 CK-5-F 6.0 4 B-2O-O5 5.5 5 YG-2O-F 5.0 6 CCY-3-O1 8.0 7 CCY-3-O2 12.0 8 CCY-3-O3 12.0 9 PUQU-3-F 11.0 10 DGUQU-4-F 8.0 11 CDUQU-3-F 6.5 12 APUQU-3-F 6.0 100.0 Physical properties T(N, I) = 78.0 C. n.sub.e(20 C., 589 nm) = 1.5927 n(20 C., 589 nm) = 0.1147 .sub.(20, 1 kHz) = 20.5 .sub.(20, 1 kHz) = 14.0 (20, 1 kHz) = 6.5 .sub.av.(20, 1 kHz) = 16.2 .sub.1(20 C.) = 342 mPa .Math. s k.sub.11(20 C.) = 12.0 pN k.sub.22(20 C.) = 6.5 pN k.sub.33(20 C.) = 14.0 pN V.sub.0(20 C.) = 1.42 V

(22) This mixture, mixture M-1, has a dielectric ratio (.sub./) of 2.2 and is characterized by a very good transmission in an FFS display and shows a very short response time.

Example 2

(23) The following mixture (M-2) is prepared and investigated.

(24) TABLE-US-00008 Mixture 2 Composition Compound Concentration No. Abbreviation /% by weight 1 CY-3-O4 20.0 2 CK-4-F 6.0 3 CK-5-F 10.5 4 CCY-3-O1 8.0 5 CCY-3-O2 12.0 6 CCY-3-O3 10.0 7 PUQU-3-F 12.0 8 DGUQU-4-F 8.0 9 CDUQU-3-F 6.0 10 APUQU-3-F 7.5 100.0 Physical properties T(N, I) = 79.0 C. n.sub.e(20 C., 589 nm) = 1.5816 n(20 C., 589 nm) = 0.1058 .sub.(20, 1 kHz) = 19.6 .sub.(20, 1 kHz) = 12.3 (20, 1 kHz) = 7.2 .sub.av.(20, 1 kHz) = 14.7 .sub.1(20 C.) = 325 mPa .Math. s k.sub.11(20 C.) = 11.9 pN k.sub.22(20 C.) = t.b.d. pN k.sub.33(20 C.) = 14.9 pN V.sub.0(20 C.) = 1.35 V Remark: t.b.d.: to be determined.

(25) This mixture, mixture M-2, has a dielectric ratio (.sub./) of 1.7 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 3

(26) The following mixture (M-3) is prepared and investigated.

(27) TABLE-US-00009 Mixture 3 Composition Compound Concentration No. Abbreviation /% by weight 1 CY-3-O2 8.0 2 CY-3-O4 15.0 3 CK-3-F 6.0 4 CCY-2-1 12.5 5 CCY-3-O1 7.0 6 CCY-3-O2 12.0 7 CCY-3-O3 8.0 8 PUQU-3-F 12.0 9 DGUQU-4-F 7.0 10 CDUQU-3-F 6.0 11 APUQU-3-F 6.5 100.0 Physical properties T(N, I) = 79.0 C. n.sub.e(20 C., 589 nm) = 1.5838 n(20 C., 589 nm) = 0.1060 .sub.(20, 1 kHz) = 17.3 .sub.(20, 1 kHz) = 10.9 (20, 1 kHz) = 6.4 .sub.av.(20, 1 kHz) = 13.0 .sub.1(20 C.) = 297 mPa .Math. s k.sub.11(20 C.) = 11.9 pN k.sub.22(20 C.) = t.b.d. pN k.sub.33(20 C.) = 15.3 pN V.sub.0(20 C.) = 1.43 V Remark: t.b.d.: to be determined

(28) This mixture, mixture M-3, has a dielectric ratio (.sub./) of 1.7 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 4

(29) The following mixture (M-4) is prepared and investigated.

(30) TABLE-US-00010 Mixture 4 Composition Compound Concentration No. Abbreviation /% by weight 1 CY-3-O4 15.0 2 YG-2O-F 6.0 3 ACQU-3-F 12.5 4 CCQU-3-F 8.0 5 CLY-2-1 10.0 6 CCY-3-O2 10.0 7 CCOY-3-1 15.0 8 CGG-3-OD 15.0 9 DGUQU-2-F 3.0 10 DGUQU-4-F 5.5 100.0 Physical properties T(N, I) = 80.0 C. n.sub.e(20 C., 589 nm) = 1.5798 n(20 C., 589 nm) = 0.1036 .sub.(20, 1 kHz) = 16.1 .sub.(20, 1 kHz) = 9.7 (20, 1 kHz) = 6.5 .sub.av.(20, 1 kHz) = 11.8 .sub.1(20 C.) = 287 mPa .Math. s k.sub.11(20 C.) = 12.0 pN k.sub.22(20 C.) = 6.6 pN k.sub.33(20 C.) = 15.0 pN V.sub.0(20 C.) = 1.44 V

(31) This mixture, mixture M-4, has a dielectric ratio (.sub./) of 1.5 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 5

(32) The following mixture (M-5) is prepared and investigated.

(33) TABLE-US-00011 Mixture 5 Composition Compound Concentration No. Abbreviation /% by weight 1 CGG-3-OD 21.0 2 PUQU-2-F 4.0 3 CCZU-2-F 4.0 4 CCZU-3-F 14.0 5 APUQU-3-F 5.0 6 CC-3-V 4.0 7 YG-2O-F 5.0 8 CY-3-O4 6.0 9 CY-5-O2 10.0 10 CCY-3-O2 9.0 11 CCY-5-O2 9.0 12 CZY-3-O2 9.0 100.0 Physical properties T(N, I) = 78.0 C. n.sub.e(20 C., 589 nm) = 1.5818 n(20 C., 589 nm) = 0.1045 .sub.(20, 1 kHz) = 14.6 .sub.(20, 1 kHz) = 9.4 (20, 1 kHz) = 5.2 .sub.av.(20, 1 kHz) = 11.2 .sub.1(20 C.) = 211 mPa .Math. s k.sub.11(20 C.) = 11.0 pN k.sub.22(20 C.) = 6.7 pN k.sub.33(20 C.) = 14.7 pN V.sub.0(20 C.) = 1.52 V

(34) This mixture, mixture M-5, has a dielectric ratio (.sub./) of 1.8 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 6

(35) The following mixture (M-6) is prepared and investigated.

(36) TABLE-US-00012 Mixture 6 Composition Compound Concentration No. Abbreviation /% by weight 1 CC-3-V 11.0 2 YG-2O-F 6.0 3 CY-3-O4 18.0 4 ACQU-3-F 6.5 5 CCP-3-OT 5.5 6 CCP-3-1 5.0 7 CCY-3-O2 10.0 8 CCY-5-O2 10.0 9 CGG-3-OD 15.0 10 APUQU-3-F 2.0 11 DGUQU-2-F 3.0 12 DGUQU-4-F 8.0 100.0 Physical properties T(N, I) = 79.5 C. n.sub.e(20 C., 589 nm) = 1.5782 n(20 C., 589 nm) = 0.1016 .sub.(20, 1 kHz) = 14.5 .sub.(20, 1 kHz) = 8.3 (20, 1 kHz) = 6.2 .sub.av.(20, 1 kHz) = 10.4 .sub.1(20 C.) = 180 mPa .Math. s k.sub.11(20 C.) = 11.9 pN k.sub.22(20 C.) = 6.0 pN k.sub.33(20 C.) = 14.1 pN V.sub.0(20 C.) = 1.46 V

(37) This mixture, mixture M-6, has a dielectric ratio (.sub./) of 1.3 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 7

(38) The following mixture (M-7) is prepared and investigated.

(39) TABLE-US-00013 Mixture 7 Composition Compound Concentration No. Abbreviation /% by weight 1 CC-3-V 17.0 2 YG-2O-F 6.0 3 CY-3-O4 18.0 4 CCP-3-OT 8.0 5 CCP-3-1 2.0 6 CCY-3-O2 12.0 7 CCY-5-O2 8.0 8 CGG-3-OD 15.0 9 APUQU-3-F 3.0 10 DGUQU-2-F 3.0 11 DGUQU-4-F 8.0 100.0 Physical properties T(N, I) = 75.5 C. n.sub.e(20 C., 589 nm) = 1.5766 n(20 C., 589 nm) = 0.0997 .sub.(20, 1 kHz) = 13.1 .sub.(20, 1 kHz) = 8.0 (20, 1 kHz) = 5.2 .sub.av.(20, 1 kHz) = 9.7 .sub.1(20 C.) = 151 mPa .Math. s k.sub.11(20 C.) = 11.5 pN k.sub.22(20 C.) = t.b.d. pN k.sub.33(20 C.) = 13.7 pN V.sub.0(20 C.) = 1.58 V Remark: t.b.d.: to be determined

(40) This mixture, mixture M-7, has a dielectric ratio (.sub./) of 1.5 and is characterized by a good transmission in an FFS display and shows a short response time.

Example 8

(41) The following mixture (M-8) is prepared and investigated.

(42) TABLE-US-00014 Mixture 8 Composition Compound Concentration No. Abbreviation /% by weight 1 CC-3-V 25.0 2 CY-3-O2 1.0 3 B-5O-OT 7.0 4 CCY-3-O1 11.0 5 CCY-3-O2 13.0 6 CCY-3-O3 15.0 7 PUQU-3-F 10.0 8 CCQU-3-F 10.0 9 CDUQU-3-F 8.0 100.0 Physical properties T(N, I) = 95 C. n.sub.e(20 C., 589 nm) = 1.5679 n(20 C., 589 nm) = 0.0937 .sub.(20, 1 kHz) = 11.2 .sub.(20, 1 kHz) = 7.5 (20, 1 kHz) = 3.6 .sub.av.(20, 1 kHz) = 8.7 .sub.1(20 C.) = 161 mPa .Math. s k.sub.11(20 C.) = 14.7 pN k.sub.22(20 C.) = 7.4 pN k.sub.33(20 C.) = 16.6 pN V.sub.0(20 C.) = 2.11 V

(43) This mixture, mixture M-8, has a dielectric ratio (.sub./) of 2.1 and is characterized by a very good transmission in an FFS display and shows a very short response time.

Example 9

(44) The following mixture (M-9) is prepared and investigated.

(45) TABLE-US-00015 Mixture 9 Composition Compound Concentration No. Abbreviation /% by weight 1 CC-3-V 13.0 2 CCP-3-1 10.0 3 CK-3-F 6.0 4 CK-4-F 5.0 5 CK-5-F 8.0 6 CCY-2-1 16.0 7 CCY-3-1 14.0 8 CGG-3-F 11.0 9 PUQU-3-F 6.0 10 CDUQU-3-F 7.0 11 APUQU-3-F 4.0 100.0 Physical properties T(N, I) = 90.5 C. n.sub.e(20 C., 589 nm) = 1.5781 n(20 C., 589 nm) = 0.0972 .sub.(20, 1 kHz) = 10.8 .sub.(20, 1 kHz) = 7.2 (20, 1 kHz) = 3.6 .sub.av.(20, 1 kHz) = 8.4 .sub.1(20 C.) = 182 mPa .Math. s k.sub.11(20 C.) = 14.1 pN k.sub.22(20 C.) = t.b.d. pN k.sub.33(20 C.) = 17.0 pN V.sub.0(20 C.) = 2.08 V Remark: t.b.d.: to be determined.

(46) This mixture, mixture M-9, has a dielectric ratio (.sub./) of 2.0 and is characterized by a good transmission in an FFS display and shows a very short response time.

Example 10

(47) The following mixture (M-10) is prepared and investigated.

(48) TABLE-US-00016 Mixture 10 Composition Compound Concentration No. Abbreviation /% by weight 1 Y-3-O1 6.0 2 B-2O-O5 6.0 3 CC-3-V 10.5 4 YG-2O-F 6.0 5 CCP-3-OT 6.5 6 CCP-V-1 17.0 7 CCP-V2-1 7.0 8 CGP-3-2 5.0 9 CGG-3-F 15.0 10 CCY-3-O2 10.0 11 APUQU-3-F 3.0 12 DGUQU-4-F 8.0 100.0 Physical properties T(N, I) = 79 C. n.sub.e(20 C., 589 nm) = 1.6005 n(20 C., 589 nm) = 0.1103 .sub.(20, 1 kHz) = 11.7 .sub.(20, 1 kHz) = 7.0 (20, 1 kHz) = 4.7 .sub.av.(20, 1 kHz) = 8.6 .sub.1(20 C.) = 117 mPa .Math. s k.sub.11(20 C.) = 11.3 pN k.sub.22(20 C.) = 6.5 pN k.sub.33(20 C.) = 14.4 pN V.sub.0(20 C.) = 1.61 V

(49) This mixture, mixture M-10, has a dielectric ratio (.sub./) of 1.5 and is characterized by a good transmission in an FFS display and shows a short response time.

(50) Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. The preceding preferred specific embodiments and examples are, therefore, to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

(51) From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions.

(52) The entire disclosures of all applications, patents and publications, cited herein and of corresponding EP Application No. 15001057.7, filed Apr. 13, 2015, and EP Application No. 15001531.1, filed May 21, 2015, are incorporated by reference herein.