Liquid-crystalline medium and electro-optical liquid-crystal display

Abstract

The invention relates to an electro-optical liquid-crystal display having a re-alignment layer for re-alignment of the liquid crystals whose field has a component, crucial for the re-alignment, parallel to the liquid-crystal layer, containing a liquid-crystalline medium, characterized in that it comprises one or more compounds of the formula I1 to I3, (I1) (I2) (I3) and at least one compound of the formula II, in which the parameters R.sup.11, R.sup.11*, Z.sup.0, Sp, k, l, p, Y.sup.21 to Y.sup.22, R.sup.21 and R.sup.22 have the meanings indicated in claim 1.

Claims

1. A liquid-crystalline medium having positive dielectric anisotropy, comprising a compound of formula I2a-1 ##STR00235## a compound of formula I2a-3 ##STR00236## and a compound of formula I2b-1 ##STR00237## and optionally at least one compound of formula I1 or I3, ##STR00238## in which R.sup.11 denotes an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF.sub.3, or at least monosubstituted by halogen, where, in addition, one or more CH.sub.2 groups in these radicals may be replaced by O, S, ##STR00239## CC, OCO, or COO in such a way that O atoms are not linked directly to one another, R.sup.11* denotes an unsubstituted alkyl or alkenyl radical having up to 15 C atoms, where, in addition, one or more CH.sub.2 groups in these radicals may be replaced by O, S, ##STR00240## CC, OCO, or COO in such a way that O atoms are not linked directly to one another, Z.sup.0 denotes COO, OCO, CH.sub.2O, OCH.sub.2, CF.sub.2O, OCF.sub.2, CH.sub.2CH.sub.2, CF.sub.2CF.sub.2, CFHCFH, CHCH, CFCF, CFCH, CC, or CHCF, Sp denotes O, an alkylene, alkyleneoxy, oxaalkylene or alkenylene radical having up to 6 C atoms which is unsubstituted or mono- or polysubstituted by halogen, p denotes 0 or 1, l and k denote 0 to 5, further comprising at least one compound of formula IIg, ##STR00241## in which R.sup.21 is an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, or monosubstituted by CN or CF.sub.3 or at least monosubstituted by halogen, where, in addition, one or more CH.sub.2 groups may be replaced by O, S, ##STR00242## CC, OCO, or OCO in such a way that O atoms are not linked directly to one another, at least one compound of formula, and at least one compound of formula VI-5, ##STR00243## in which R.sup.61 denotes an unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH.sub.2 groups in this radical may each be replaced, independently of one another, by CC, CHCH, CFCF, CFCH, CHCF, (CO)O, O(CO), (CO) or O in such a way that O atoms are not linked directly to one another, X.sup.61 denotes F, Cl, CN or alkyl, alkenyl, alkenyloxy, alkylalkoxy or alkoxy having 1 to 3 C atoms which is mono- or polysubstituted by F.

2. The medium according to claim 1, wherein the compounds of the formula I1 to I3 are selected from the compounds of the formula I1a to I1g, and/or I3a to I3c, ##STR00244## in which R.sup.11 has one of the meaning indicated under formula I, m denotes 1 to 5, k, l, and n denote 0 to 5.

3. The medium according to claim 1, further comprising at least one compound of formula IV, ##STR00245## in which R.sup.41 denotes an alkyl, or alkoxy radical having 1 to 10 C atoms or an alkenyl radical having 2 to 10 C atoms, R.sup.42 has one of the meanings of R.sup.41 or X.sup.41, A.sup.41 denotes ##STR00246## X.sup.41 denotes F, Cl, CN, a halogenated alkyl, or alkoxy radical having 1 to 6 C atoms or a halogenated alkenyl radical having 2 to 6 C atoms.

4. The medium according to claim 1, further comprising at least one additional compound of formula VI, ##STR00247## in which R.sup.61 denotes an unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH.sub.2 groups in this radical may each be replaced, independently of one another, by CC, CHCH, CFCF, CFCH, CHCF, (CO)O, O(CO), (CO) or O in such a way that O atoms are not linked directly to one another, A.sup.61, A.sup.62 each, independently of one another, denote ##STR00248## X.sup.61 denotes F, Cl, CN or alkyl, alkenyl, alkenyloxy, alkylalkoxy or alkoxy having 1 to 3 C atoms which is mono- or polysubstituted by F.

5. The medium according to claim 1, further comprising at least one compound of formula V, ##STR00249## in which R.sup.51 and R.sup.52 each, independently of one another, denote an alkyl or alkoxy radical having 1 to 10 C atoms, an alkenyl radical having 2 to 10 C atoms and L denotes H or F.

6. A process for the preparation of a medium according to claim 1, comprising mixing compound of formula I2-a1, I2-a3 and I2-b1, and optionally one or more compounds of the formula I1 or I3 and a compound of formula IIg, with one or more of the compounds of the formula IV, ##STR00250## in which R.sup.41 denotes an alkyl, or alkoxy radical having 1 to 10 C atoms or an alkenyl radical having 2 to 10 C atoms, R.sup.42 has one of the meanings of R.sup.41 or X.sup.41, A.sup.41 denotes ##STR00251## X.sup.41 denotes F, Cl, CN, a halogenated alkyl, or alkoxy radical having 1 to 6 C atoms or a halogenated alkenyl radical having 2 to 6 C atoms, and a compound of the formula VI-5, ##STR00252## in which R.sup.61 denotes an unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH.sub.2 groups in this radical may each be replaced, independently of one another, by CC, CHCH, CFCF, CFCH, CHCF, (CO)O, O(CO), (CO) or O in such a way that O atoms are not linked directly to one another, X.sup.61 denotes F, Cl, CN or alkyl, alkenyl, alkenyloxy, alkylalkoxy or alkoxy having 1 to 3 C atoms which is mono- or polysubstituted by F.

7. An electro-optical display comprising a dielectric that is a liquid-crystalline medium according to claim 1.

8. An electro-optical display having a re-alignment layer realigning of the liquid crystals, whose field has a re-alignment component parallel to the liquid-crystal layer, said display containing, as dielectric, a liquid-crystalline medium according to claim 1.

9. The medium according to claim 1, comprising CC-3-V CC-3-V1 CC-3-2V1 CCP-V2-1 CCQU-3-F CCP-30CF3 CCGU-3-F APUQU-2-F APUQU-3-F PGUQU-3-F PGUQU-4-F and PGUQU-5-F.

10. The medium according to claim 1, comprising CC-3-V CC-3-V1 CC-3-2V1 CCQU-3-F CCP-30CF3 CCGU-3-F APUQU-2-F APUQU-3-F PGUQU-3-F PGUQU-4-F and PGUQU-5-F.

Description

COMPARATIVE EXAMPLE 1

(1) A nematic mixture CM1 having the following physical properties and the following composition is prepared.

(2) TABLE-US-00007 Mixture M1: Composition Compound No. Abbreviation c/% 1 PCH-5F 4.0 2 CCP- 21.3 20CF2.F.F 3 CCP- 20.0 30CF2.F.F 4 CCP- 21.3 50CF2.F.F 5 CUP-2F.F 6.7 6 CUP-3F.F 6.7 7 CBC-33F 6.7 8 CBC-53F 6.7 9 CBC-55F 6.7 100.0 Physical properties T(N, I) = 124.5 C. n (20 C., 589.3 nm) = 0.105 (20 C., 1 kHz) = 8.3 K.sub.11(20 C.) = 13.5 pN K.sub.33(20 C.) = 18.2 pN .sub.1 (20 C.) = 444 mPa .Math. s V.sub.0 (20 C.) = 1.35 V

Example 1

(3) 20% by weight of compound (1) are added to mixture CM1, and the physical properties of the mixture (M1) are determined.

(4) ##STR00215##

(5) TABLE-US-00008 Physical properties T(N, I) = 106.6 C. n (20 C., 589.3 nm) = 0.050 (20 C., 1 kHz) = 7.00 K.sub.11(20 C.) = 14.8 pN K.sub.33 (20 C.) = 17.3 pN .sub.1 (20 C.) = 124 mPa .Math. s V.sub.0 (20 C.) = 1.53 V

(6) An IPS display containing mixture M1 has adequate contrast.

Example 2

(7) 20% by weight of compound (2) are added to mixture CM1, and the physical properties of the mixture (M2) are determined.

(8) ##STR00216##

(9) TABLE-US-00009 Physical properties T(N, I) = 106.4 C. n (20 C., 589.3 nm) = 0.052 (20 C., 1 kHz) = 7.14 K.sub.11(20 C.) = 14.3 pN K.sub.33 (20 C.) = 17.5 pN .sub.1 (20 C.) = 112 mPa .Math. s V.sub.0 (20 C.) = 1.49 V

(10) An IPS display containing mixture M2 has adequate contrast.

Example 3

(11) 20% by weight of compound (3) are added to mixture CM1, and the physical properties of the mixture (M3) are determined.

(12) ##STR00217##

(13) TABLE-US-00010 Physical properties T(N, I) = 103.4 C. n (20 C., 589.3 nm) = 0.054 (20 C., 1 kHz) = 7.17 K.sub.11(20 C.) = 13.6 pN K.sub.33 (20 C.) = 18.0 pN .sub.1 (20 C.) = 82 mPa .Math. s V.sub.0 (20 C.) = 1.45 V

(14) An IPS display containing mixture M3 has adequate contrast.

Example 4

(15) 20% by weight of compound (4) are added to mixture CM1, and the physical properties of the mixture (M4) are determined.

(16) ##STR00218##

(17) TABLE-US-00011 Physical properties T(N, I) = 108.4 C. n (20 C., 589.3 nm) = 0.062 (20 C., 1 kHz) = 7.73 K.sub.11(20 C.) = 14.2 pN K.sub.33 (20 C.) = 17.7 pN .sub.1 (20 C.) = 91 mPa .Math. s V.sub.0 (20 C.) = 1.43 V

(18) An IPS display containing mixture M4 has adequate contrast.

Example 5

(19) 20% by weight of compound (5) are added to mixture CM1, and the physical properties of the mixture (M5) are determined.

(20) ##STR00219##

(21) TABLE-US-00012 Physical properties T(N, I) = 105.4 C. n (20 C., 589.3 nm) = 0.057 (20 C., 1 kHz) = 6.79 K.sub.11(20 C.) = 13.1 pN K.sub.33 (20 C.) = 17.8 pN .sub.1 (20 C.) = 76 mPa .Math. s V.sub.0 (20 C.) = 1.467 V

(22) An IPS display containing mixture M5 has adequate contrast.

Example 6

(23) 20% by weight of compound (6) are added to mixture CM1, and the physical properties of the mixture (M6) are determined.

(24) ##STR00220##

(25) TABLE-US-00013 Physical properties T(N, I) = 98.9 C. n (20 C., 589.3 nm) = 0.053 (20 C., 1 kHz) = 7.89 K.sub.11(20 C.) = 12.9 pN K.sub.33 (20 C.) = 17.2 pN .sub.1 (20 C.) = 111 mPa .Math. s V.sub.0 (20 C.) = 1.35 V

(26) An IPS display containing mixture M6 has adequate contrast.

Example 7

(27) 20% by weight of compound (7) are added to mixture CM1, and the physical properties of the mixture (M7) are determined.

(28) ##STR00221##

(29) TABLE-US-00014 Physical properties T(N, I) = 94.8 C. n (20 C., 589.3 nm) = 0.059 (20 C., 1 kHz) = 7.55 K.sub.11(20 C.) = 11.9 pN K.sub.33 (20 C.) = 17.1 pN .sub.1 (20 C.) = 89 mPa .Math. s V.sub.0 (20 C.) = 1.33 V

(30) An IPS display containing mixture M7 has adequate contrast.

Example 8

(31) 20% by weight of compound (8) are added to mixture CM1, and the physical properties of the mixture (M8) are determined.

(32) ##STR00222##

(33) TABLE-US-00015 Physical properties T(N, I) = 90.4 C. n (20 C., 589.3 nm) = 0.051 (20 C., 1 kHz) = 7.04 K.sub.11(20 C.) = 12.18 pN K.sub.33 (20 C.) = 15.22 pN .sub.1 (20 C.) = 99 mPa .Math. s V.sub.0 (20 C.) = 1.39 V

(34) An IPS display containing mixture M8 has adequate contrast.

Example 9

(35) 20% by weight of compound (9) are added to mixture CM1, and the physical properties of the mixture (M9) are determined.

(36) ##STR00223##

(37) TABLE-US-00016 Physical properties T(N, I) = 87.5 C. n (20 C., 589.3 nm) = 0.059 (20 C., 1 kHz) = 7.31 K.sub.11(20 C.) = 12.3 pN K.sub.33 (20 C.) = 15.1 pN .sub.1 (20 C.) = 63 mPa .Math. s V.sub.0 (20 C.) = 1.37 V

(38) An IPS display containing mixture M9 has adequate contrast.

Example 10

(39) 20% by weight of compound (10) are added to mixture CM1, and the physical properties of the mixture (M10) are determined.

(40) ##STR00224##

(41) TABLE-US-00017 Physical properties T(N, I) = 92.2 C. n (20 C., 589.3 nm) = 0.055 (20 C., 1 kHz) = 6.29 K.sub.11(20 C.) = 11.4 pN K.sub.33 (20 C.) = 13.7 pN .sub.1 (20 C.) = 101 mPa .Math. s V.sub.0 (20 C.) = 1.42 V

(42) An IPS display containing mixture M10 has adequate contrast.

Example 11

(43) 20% by weight of compound (11) are added to mixture CM1, and the physical properties of the mixture (M11) are determined.

(44) ##STR00225##

(45) TABLE-US-00018 Physical properties T(N, I) = 92.9 C. n (20 C., 589.3 nm) = 0.050 (20 C., 1 kHz) = 7.22 K.sub.11(20 C.) = 11.0 pN K.sub.33 (20 C.) = 14.3 pN .sub.1 (20 C.) = 76 mPa .Math. s V.sub.0 (20 C.) = 1.30 V

(46) An IPS display containing mixture M11 has adequate contrast.

Example 12

(47) 20% by weight of compound (12) are added to mixture CM1, and the physical properties of the mixture (M12) are determined.

(48) ##STR00226##

(49) TABLE-US-00019 Physical properties T(N, I) = 114.4 C. n (20 C., 589.3 nm) = 0.059 (20 C., 1 kHz) = 6.26 K.sub.11(20 C.) = 15.3 pN K.sub.33 (20 C.) = 19.0 pN .sub.1 (20 C.) = 43 mPa .Math. s V.sub.0 (20 C.) = 1.65 V

(50) An IPS display containing mixture M12 has adequate contrast.

Example 13

(51) 20% by weight of compound (13) are added to mixture CM1, and the physical properties of the mixture (M131 are determined.

(52) ##STR00227##

(53) TABLE-US-00020 Physical properties T(N, I) = 109.5 C. n (20 C., 589.3 nm) = 0.057 (20 C., 1 kHz) = 6.12 K.sub.11(20 C.) = 14.0 pN K.sub.33 (20 C.) = 18.6 pN .sub.1 (20 C.) = 28 mPa .Math. s V.sub.0 (20 C.) = 1.60 V

(54) An IPS display containing mixture M13 has adequate contrast.

Example 14

(55) 20% by weight of compound (14) are added to mixture CM1, and the physical properties of the mixture (M14) are determined.

(56) ##STR00228##

(57) TABLE-US-00021 Physical properties T(N, I) = 113.1 C. n (20 C., 589.3 nm) = 0.066 (20 C., 1 kHz) = 6.15 K.sub.11(20 C.) = 14.3 pN K.sub.33 (20 C.) = 18.3 pN .sub.1 (20 C.) = 37 mPa .Math. s V.sub.0 (20 C.) = 1.61 V

(58) An IPS display containing mixture M14 has adequate contrast.

Example 15

(59) 20% by weight of compound (15) are added to mixture CM1, and the physical properties of the mixture (M15) are determined.

(60) ##STR00229##

(61) TABLE-US-00022 Physical properties T(N, I) = 102.2 C. n (20 C., 589.3 nm) = 0.052 (20 C., 1 kHz) = 6.10 K.sub.11(20 C.) = 12.5 pN K.sub.33 (20 C.) = 16.2 pN .sub.1 (20 C.) = 18 mPa .Math. s V.sub.0 (20 C.) = 1.51 V

(62) An IPS display containing mixture M15 has adequate contrast.

Example 16

(63) 20% by weight of compound (16) are added to mixture CM1, and the physical properties of the mixture (M16) are determined.

(64) ##STR00230##

(65) TABLE-US-00023 Physical properties T(N, I) = 90.8 C. n (20 C., 589.3 nm) = 0.040 (20 C., 1 kHz) = 5.83 K.sub.11(20 C.) = 11.9 pN K.sub.33 (20 C.) = 12.5 pN .sub.1 (20 C.) = 29 mPa .Math. s V.sub.0 (20 C.) = 1.51 V

(66) An IPS display containing mixture M16 has adequate contrast.

Example 17

(67) 20% by weight of compound (17) are added to mixture CM1, and the physical properties of the mixture (M17) are determined.

(68) ##STR00231##

(69) TABLE-US-00024 Physical properties T(N, I) = 94.4 C. n (20 C., 589.3 nm) = 0.042 (20 C., 1 kHz) = 5.70 K.sub.11(20 C.) = 11.6 pN K.sub.33 (20 C.) = 13.3 pN .sub.1 (20 C.) = 27 mPa .Math. s V.sub.0 (20 C.) = 1.51 V

(70) An IPS display containing mixture M17 has adequate contrast.

Example 18

(71) 20% by weight of compound (18) are added to mixture CM1, and the physical properties of the mixture (M18) are determined.

(72) ##STR00232##

(73) TABLE-US-00025 Physical properties T(N, I) = 120.8 C. n (20 C., 589.3 nm) = 0.056 (20 C., 1 kHz) = 6.60 K.sub.11(20 C.) = 14.5 pN K.sub.33 (20 C.) = 19.1 pN .sub.1 (20 C.) = 74 mPa .Math. s V.sub.0 (20 C.) = 1.54 V

(74) An IPS display containing mixture M18 has adequate contrast.

Example 19

(75) 20% by weight of compound (19) are added to mixture CM1, and the physical properties of the mixture (M19) are determined.

(76) ##STR00233##

(77) TABLE-US-00026 Physical properties T(N, I) = 113.6 C. n (20 C., 589.3 nm) = 0.072 (20 C., 1 kHz) = 6.20 K.sub.11(20 C.) = 13.7 pN K.sub.33 (20 C.) = 20.4 pN .sub.1 (20 C.) = 44 mPa .Math. s V.sub.0 (20 C.) = 1.55 V

(78) An IPS display containing mixture M19 has adequate contrast.

Example 20

(79) 10% by weight of compound (20) are added to mixture CM1, and the physical properties of the mixture (M20) are determined.

(80) ##STR00234##

(81) TABLE-US-00027 Physical properties T(N, I) = 118.7 C. n (20 C., 589.3 nm) = 0.080 (20 C., 1 kHz) = 6.35 K.sub.11(20 C.) = 14.5 pN K.sub.33 (20 C.) = 18.0 pN .sub.1 (20 C.) = 48 mPa .Math. s V.sub.0 (20 C.) = 1.60 V

(82) An IPS display containing mixture M20 has adequate contrast.

Example 21

(83) A nematic mixture M21 having the following physical properties and the following composition is prepared.

(84) TABLE-US-00028 CC-3-V 32.00% T(N, I) [ C.]: 93.5 CC-3-V1 12.00% CCP-V2-1 5.00% n [589 nm, 20 C.] 0.103 CCQU-3-F 11.00% [kHz, 20 C.]: +12.1 CCP-30CF3 4.00% .sub.1 [mPa .Math. s, 20 C.]: 95 CCGU-3-F 5.00% K.sub.1 [20 C.]: 14.0 APUQU-2-F 8.00% K.sub.3 [20 C.]: 17.3 APUQU-3-F 8.00% V.sub.0 [V]: 1.15 PGUQU-3-F 5.00% PGUQU-4-F 5.00% PGUQU-5-F 5.00%

(85) An IPS display containing mixture M21 has adequate contrast.

Example 22

(86) A nematic mixture M22 having the following physical properties and the following composition is prepared.

(87) TABLE-US-00029 CC-3-V 28.00% T(N, I) [ C.]: 94.5 CC-3-V1 9.00% n [589 nm, 20 C.] 0.103 CC-3-2V1 9.00% [kHz, 20 C.]: +12.3 CCP-V2-1 3.00% .sub.1 [mPa .Math. s, 20 C.]: 100 CCQU-3-F 11.00% K.sub.1 [20 C.]: 15.1 CCP-30CF3 4.00% K.sub.3 [20 C.]: 17.2 CCGU-3-F 5.00% V.sub.0 [V]: 1.16 APUQU-2-F 8.00% APUQU-3-F 8.00% PGUQU-3-F 5.00% PGUQU-4-F 5.00% PGUQU-5-F 5.00%

(88) An IPS display containing mixture M22 has adequate contrast.

Example 23

(89) A nematic mixture M23 having the following physical properties and the following composition is prepared.

(90) TABLE-US-00030 CC-3-V 31.00% T(N, I) [ C.]: 90.5 CC-3-V1 9.00% n [589 nm, 20 C.] 0.101 CC-3-2V1 9.00% [kHz, 20 C.]: +11.9 CCQU-3-F 9.00% .sub.1 [mPa .Math. s, 20 C.]: 92 CCP-30CF3 6.00% K.sub.1 [20 C.]: 14.7 CCGU-3-F 5.00% K.sub.3 [20 C.]: 16.9 APUQU-2-F 8.00% V.sub.0 [V]: 1.17 APUQU-3-F 8.00% PGUQU-3-F 5.00% PGUQU-4-F 5.00% PGUQU-5-F 5.00%

(91) An IPS display containing mixture M23 has adequate contrast.

Example 24

(92) A nematic mixture M24 having the following physical properties and the following composition is prepared.

(93) TABLE-US-00031 CC-3-V 30.00% T(N, I) [ C.]: 93.5 CC-3-V1 12.00% n [589 nm, 20 C.] 0.085 CCP-V2-1 4.00% [kHz, 20 C.]: +10.1 CCGU-3-F 7.00% .sub.1 [mPa .Math. s, 20 C.]: 96 ACQU-3F 5.00% K.sub.1 [20 C.]: 14.2 CCQU-3-F 12.00% K.sub.3 [20 C.]: 17.1 CCQU-5-F 12.00% V.sub.0 [V]: 1.25 APUQU-2-F 9.00% APUQU-3-F 9.00%

(94) An IPS display containing mixture M24 has adequate contrast.

Example 25

(95) A nematic mixture M25 having the following physical properties and the following composition is prepared.

(96) TABLE-US-00032 CC-3-V 32.00% T(N, I) [ C.]: 96.0 CC-3-V1 12.00% n [589 nm, 20 C.] 0.084 CCP-V2-1 5.00% [kHz, 20 C.]: +9.9 CCGU-3-F 7.00% .sub.1 [mPa .Math. s, 20 C.]: 94 CCQU-3-F 12.00% K.sub.1 [20 C.]: 14.5 CCQU-5-F 10.00% K.sub.3 [20 C.]: 18.2 APUQU-2-F 6.00% V.sub.0 [V]: 1.27 APUQU-3-F 8.00% CDUQU-3-F 8.00%

(97) An IPS display containing mixture M25 has adequate contrast.

Example 26

(98) A nematic mixture M26 having the following physical properties and the following composition is prepared.

(99) TABLE-US-00033 CC-3-V 32.00% T(N, I) [ C.]: 93.5 CC-3-V1 12.00% n [589 nm, 20 C.] 0.103 CCP-V2-1 5.00% [kHz, 20 C.]: +12.1 CCQU-3-F 11.00% .sub.1 [mPa .Math. s, 20 C.]: 95 CCP-3-0CF3 4.00% K.sub.1 [20 C.]: 14.0 CCGU-3-F 5.00% K.sub.3 [20 C.]: 17.3 APUQU-2-F 8.00% V.sub.0 [V]: 1.13 APUQU-3-F 8.00% PGUQU-3-F 5.00% PGUQU-4-F 5.00% PGUQU-5-F 8.00%

(100) An IPS display containing mixture M26 has adequate contrast.

Example 27

(101) A nematic mixture M27 having the following physical properties and the following composition is prepared.

(102) TABLE-US-00034 CC-3-V 29.00% T(N, I) [ C.]: 90.5 CC-3-V1 12.00% n [589 nm, 20 C.] 0.104 CCP-V2-1 7.00% [kHz, 20 C.]: +11.8 CCQU-3-F 10.00% .sub.1 [mPa .Math. s, 20 C.]: 94 PP-1-2V1 6.00% K.sub.1 [20 C.]: 15.0 CCGU-3-F 5.00% K.sub.3 [20 C.]: 16.8 APUQU-2-F 6.00% V.sub.0 [V]: 1.19 APUQU-3-F 8.00% PGUQU-3-F 5.00% PGUQU-4-F 4.00% CDUQU-3-F 8.00%

(103) An IPS display containing mixture M2/has adequate contrast.

Example 28

(104) A nematic mixture M28 having the following physical properties and the following composition is prepared.

(105) TABLE-US-00035 CC-3-V 32.00% T(N, I) [ C.]: 87.0 CC-3-V1 12.00% n [589 nm, 20 C.] 0.102 CCP-V2-1 4.00% [kHz, 20 C.]: +12.0 CCQU-3-F 10.00% .sub.1 [mPa .Math. s, 20 C.]: 87 PP-1-2V1 5.00% K.sub.1 [20 C.]: 14.0 CCGU-3-F 5.00% K.sub.3 [20 C.]: 16.3 APUQU-2-F 6.00% V.sub.0 [V]: 1.14 APUQU-3-F 8.00% PGUQU-3-F 5.00% PGUQU-4-F 5.00% CDUQU-3-F 8.00%

(106) An IPS display containing mixture M28 has adequate contrast.