Negative dielectric anisotropy liquid crystal composition

Abstract

A negative dielectric anisotropy liquid crystal composition having one or more A-R.sub.0B compounds represented by formula I above as a first component, and one or more compounds represented by formula II above as a second component: ##STR00001##
The liquid crystal composition has a good stability against light and heat, a lower viscosity, a wider refractive index that may be achieved by adjusting the monomer ratio, and a higher clearing point (a very wide service temperature range). The liquid crystal composition has a higher light transmittance, thus allowing a display device to have a higher brightness or an energy saving effect.

Claims

1. A negative dielectric anisotropy liquid crystal composition, wherein said liquid crystal composition comprises one or more compounds represented by formula I2-4 to I2-7, I3-3, I3-4, I3-7 as a first component, and one or more compounds represented by formula II as a second component: ##STR00039## ##STR00040## ##STR00041## wherein R.sub.3 and R.sub.4 each independently represent an alkyl group having a carbon atom number of 1-10, fluorine, a fluorine-substituted alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, a fluorine-substituted alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10, a fluorine-substituted alkenyl group having a carbon atom number of 2-10, an alkenoxy group having a carbon atom number of 3-8 or a fluorine-substituted alkenoxy group having a carbon atom number of 3-8, and any one or more CH.sub.2 in the groups represented by R.sub.3 and R.sub.4 may be substituted with cyclopentyl, cyclobutyl or cyclopropyl; R.sub.1 and R.sub.2 each independently represent an alkyl group having a carbon atom number of 1-10, fluorine, a fluorine-substituted alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, a fluorine-substituted alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10, a fluorine-substituted alkenyl group having a carbon atom number of 2-10, an alkenoxy group having a carbon atom number of 3-8 or a fluorine-substituted alkenoxy group having a carbon atom number of 3-8, and any one or more CH.sub.2 in the groups represented by R.sub.1 and R.sub.2 may be substituted with cyclopentyl, cyclobutyl or cyclopropyl; Z.sub.1 and Z.sub.2 each independently represent a single bond, CH.sub.2CH.sub.2 or CH.sub.2O; ##STR00042## each independently represent one or more of ##STR00043## m represents 1, 2 or 3; n represents 0 or 1; each X independently represents CH.sub.2, O or S.

2. The liquid crystal composition according to claim 1, wherein said one or more compounds represented by formula II are one or more of compounds represented by formulas II1 to II13: ##STR00044## ##STR00045## wherein R.sub.1 and R.sub.2 each independently represent an alkyl group having a carbon atom number of 1-10, fluorine, a fluorine-substituted alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, a fluorine-substituted alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10, a fluorine-substituted alkenyl group having a carbon atom number of 2-10, an alkenoxy group having a carbon atom number of 3-8 or a fluorine-substituted alkenoxy group having a carbon atom number of 3-8, and any one or more CH.sub.2 in the groups represented by R.sub.1 and R.sub.2 may be substituted with cyclopentyl, cyclobutyl or cyclopropyl.

3. The liquid crystal composition according to claim 2, wherein in said liquid crystal composition, a total content in mass percentage of said one or more compounds represented by formula I2-4 to I2-7, I3-3, I3-4, I3-7 is 1-40%, and a total content in mass percentage of said one or more compounds represented by formula II is 1-65%.

4. The liquid crystal composition according to claim 1, wherein said liquid crystal composition further comprises one or more compounds represented by formula III ##STR00046## wherein R.sub.5 and R.sub.6 each independently represent an alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10 or an alkenoxy group having a carbon atom number of 3-8, and any one or more unconnected CH.sub.2 in the groups represented by R.sub.5 and R.sub.6 may be substituted with cyclopentyl, cyclobutyl, cyclopropyl, or O; ##STR00047## represents one or more of ##STR00048## or any fluorobenzene; and each w independently represents 1, 2 or 3.

5. The liquid crystal composition according to claim 4, wherein said one or more compounds represented by formula III are one or more compounds represented by formulas III1 to III5: ##STR00049## wherein R.sub.51 and R.sub.61 each independently represent an alkyl group having a carbon atom number of 1-6, an alkoxy group having a carbon atom number of 1-6, an alkenyl group having a carbon atom number of 2-6 or an alkenoxy group having a carbon atom number of 3-6.

6. The liquid crystal composition according to claim 1, wherein said liquid crystal composition further comprises one or more compounds represented by formula IV ##STR00050## wherein R.sub.7 and R.sub.8 each independently represent an alkyl group having a carbon atom number of 1-10, a fluorine-substituted alkyl group having a carbon atom number of 1-10, an alkoxy group having a carbon atom number of 1-10, a fluorine-substituted alkoxy group having a carbon atom number of 1-10, an alkenyl group having a carbon atom number of 2-10, a fluorine-substituted alkenyl group having a carbon atom number of 2-10, an alkenoxy group having a carbon atom number of 3-8 or a fluorine-substituted alkenoxy group having a carbon atom number of 3-8, and any one or more CH.sub.2 in groups R.sub.7 and R.sub.8 may be substituted with cyclopentyl, cyclobutyl or cyclopropyl; and W represents O, S or CH.sub.2O.

7. The liquid crystal composition according to claim 1, wherein said liquid crystal composition further comprises one or more compounds represented by formula V: ##STR00051## wherein R.sub.9 represents an alkyl group having a carbon atom number of 1-5 or an alkenyl group having a carbon atom number of 2-5; R.sub.10 represents a F atom, an alkyl group having a carbon atom number of 1-5, an alkoxy group having a carbon atom number of 1-5 or an alkenyl group having a carbon atom number of 2-5; any one or more CH.sub.2 in the groups represented by R.sub.9 and R.sub.10 may be substituted with cyclopentyl, cyclobutyl or cyclopropyl; r represents 0 or 1; and each (F) independently represents H or F.

8. A liquid crystal display element or liquid crystal display comprising the liquid crystal composition of claim 1, wherein said liquid crystal display element or liquid crystal display is an active matrix display element or display or a passive matrix display element or display.

Description

DETAILED DESCRIPTION OF EMBODIMENTS

(1) The present invention is further described in conjunction with particular examples below, but the present invention is not limited to the following examples. Said methods are all conventional methods, unless otherwise specified. Said raw materials are all commercially available, unless otherwise specified.

(2) The reaction process is generally monitored through TLC, and the post-treatments after the reaction is completed are generally water washing, extracting, combining organic phases and then drying, evaporating and removing the solvent under a reduced pressure, recrystallization and column chromatographic separation; and a person skilled in the art would be able to achieve the present invention according to the following description.

(3) In the present specification, the percentages are mass percentages, the temperatures are in degree Celsius ( C.), and the specific meanings of other symbols and the test conditions are as follows:

(4) Cp represents the clearing point of the liquid crystal ( C.), as measured by means of a DSC quantitative method;

(5) n represents optical anisotropy, n.sub.o is the refractive index of an ordinary light, n.sub.e is the refractive index of an extraordinary light, with the test conditions being: 252 C., 589 nm and using an abbe refractometer for testing;

(6) represents the dielectric anisotropy, =.sub..sub., wherein the .sub. is a dielectric constant parallel to a molecular axis, and .sub. is a dielectric constant perpendicular to the molecular axis, with the test conditions being: 250.5 C., using 20-micron parallel cells, and using INSTEC: ALCT-IR1 for testing;

(7) 1 represents a rotary viscosity (mPa.Math.s), with the test conditions being: 250.5 C., using 20-micron parallel cells, and using INS TEC: ALCT-IR1 for testing; and

(8) Tr (%) represents a transmittance, Tr (%)=100%*bright state (Vop) luminance/light source luminance, the test device is DMS501, the test condition is 250.5 C., the test cell is a 3.9 micron IPS test cell, both the electrode spacing and the electrode width are 3*5 microns, and the included angle between the frictional direction and the electrode is 83; therefore, there is a positive correlation between .sub. and Tr, so in the evaluation of the transmittance, al can be used as an evaluation index for indication.

(9) In the examples of the invention of the present application, liquid crystal monomer structures are represented by codes, and the codes for ring structures, end groups and linking groups of liquid crystals are represented as in Tables (I) and (II) below

(10) TABLE-US-00001 TABLE (I) Corresponding code for ring structure Ring structure Corresponding code 0 C P G U GI Y PI HHPY N M 0 A D BHHO-m-nFF DFDBF-m-m B(S)

(11) TABLE-US-00002 TABLE (II) Corresponding code for end group and linking group End group and linking group Corresponding code C.sub.nH.sub.2n+1 n- C.sub.nH.sub.2n+1O nO OCF.sub.3 OT CF.sub.3 T CF.sub.2O Q F F CN N CH2CH2 E CH=CH V CC T COO Z CH=CHCnH2n+1 Vn C(5) C(4) C(3)1

EXAMPLES

(12) ##STR00038##

Comparative Example 1

(13) TABLE-US-00003 Category Liquid crystal monomer code Content (%) III CPP-3-2V1 5.50 III CC-3-V 35.00 III CC-3-V1 9.50 II CCOY-2-O2 9.00 II CCOY-3-O2 8.00 II CCOY-4-O2 9.00 IV DFDBF-Cp10-O4 4.00 IV DFDBF-Cp10-O5 4.00 II PYP-2-1Cpr 8.00 IV BHHO-Cp1O-O4FF 8.00 [1 KHz, 25 C.]: 3.87 .sub.: 7.55 n [589 nm, 25 C.]: 0.1032 Cp: 84.9 C. .sub.1 [25 C.]: 100 m Pa .Math. s.

Comparative Example 2

(14) TABLE-US-00004 Category Liquid crystal monomer code Content (%) III CPP-3-2 3.00 III CPP-3-2-V1 9.00 III CC-3-V 42.00 III CC-3-V1 9.00 II CCOY-2-O2 5.00 II CCOY-3-O2 6.00 II CCOY-3-O2 5.00 IV DFDBF-Cp10-O4 4.00 IV DFDBF-Cp10-O5 4.00 II PP-5-O2 6.50 II PYP-2-1Cpr 6.50 [1 KHz, 25 C.]: 1.78 .sub.: 5.00 n [589 nm, 25 C.]: 0.1027 Cp: 80.9 C. .sub.1 [25 C.]: 58 m Pa .Math. s.

(15) After filling test cells with the liquid crystal compositions for testing, the following results are obtained: At a working voltage equal to 6 V, the transmittance of Example 1 is higher than that of Comparative Example 1 by about 3.0%, and at a working voltage equal to 10 V, the transmittance of Example 2 is higher than that of Comparative Example 2 by about 4.0%.

Example 1

(16) TABLE-US-00005 Category Liquid crystal monomer code Content (%) III CC-3-V 28.00 III CC-3-V1 10.00 III CC-3-5 4.00 II CCOY-2-O2 10.00 II CCOY-3-O2 10.00 II CCOY-4-O2 10.00 IV DFDBF-Cp10-O4 2.00 IV DFDBF-Cp10-O5 2.50 I PUQY-3-O2 5.00 I PUQY-3-O4 4.50 II PYP-2-1Cpr 6.00 IV BHHO-Cp1O-O4FF 8.00 [1 KHz, 25 C.]: 3.83 .sub.: 7.86 n [589 nm, 25 C.]: 0.1006 Cp: 84.6 C. .sub.1 [25 C.]: 128 m Pa .Math. s.

Example 2

(17) TABLE-US-00006 Category Liquid crystal monomer code Content (%) III CC-3-V 42.00 III CC-3-V1 9.00 III CPP-3-2V1 9.00 II CCOY-2-O2 5.00 II CCOY-3-O2 6.00 II CCOY-4-O2 5.00 IV DFDBF-Cp10-O4 4.00 IV DFDBF-Cp10-O5 4.00 I PUQY-3-O2 6.50 I PUQY-3-O4 6.50 I PGUQY-3-O2 3.00 [1 KHz, 25 C.]: 1.89 .sub.: 5.78 n [589 nm, 25 C.]: 0.0995 Cp: 81.9 C. .sub.1 [25 C.]: 78 m Pa .Math. s.

Example 3

(18) TABLE-US-00007 Category Liquid crystal monomer code Content (%) III CC-3-V 30.00 III CC-3-V1 10.00 III CC-3-5 4.00 II CCOY-2-O2 10.00 II CCOY-3-O2 10.00 II CCOY-4-O2 10.00 I PUQY-3-O2 9.00 I PUQY-3-O4 11.00 II PYP-2-1Cpr 6.00 [1 KHz, 25 C.]: 2.53 .sub.: 6.57 n [589 nm, 25 C.]: 0.0980 Cp: 86.0 C. .sub.1 [25 C.]: 115 m Pa .Math. s.

Example 4

(19) TABLE-US-00008 Category Liquid crystal monomer code Content (%) III CC-3-V 39.00 III CC-3-V1 6.00 III CPP-3-2V1 7.00 II CCOY-2-O2 9.00 II CCOY-3-O2 8.00 II CCOY-4-O2 9.00 IV DFDBF-Cp10-O4 6.00 IV DFDBF-Cp10-O5 6.00 I PUQY-3-F 7.00 I PGUQY-3-F 3.00 [1 KHz, 25 C.]: 2.22 .sub.: 7.26 n [589 nm, 25 C.]: 0.0985 Cp: 83.0 C. .sub.1 [25 C.]: 67 m Pa .Math. s.

Example 5

(20) TABLE-US-00009 Category Liquid crystal monomer code Content (%) III CPP-5-2 8.00 III CC-3-V 19.00 III CC-3-V1 5.00 III CPP-3-2V1 8.00 II CY-3-O2 14.00 II CY-3-O4 7.00 II CY-5-O2 12.00 II CCY-2-O2 10.00 II CCY-3-O2 8.00 II PYP-2-3 6.00 I PUQY-3-O2 3.00 [1 KHz, 25 C.]: 3.18 .sub.: 6.96 n [589 nm, 25 C.]: 0.1006 Cp: 75.3 C. .sub.1 [25 C.]: 18 m Pa .Math. s.

Example 6

(21) TABLE-US-00010 Category Liquid crystal monomer code Content (%) III CCH-23 22.00 III CCH-34 5.00 III CCH-35 5.00 II CY-3-O2 11.00 II CCY-3-O2 6.00 II CLY-3-O2 10.00 II CPY-2-O2 10.00 II CPY-3-O2 10.00 II PY-3-O2 15.00 II PYP-2-3 3.00 I PUQY-3-O2 3.00 [1 KHz, 25 C.]: 3.89 .sub.: 7.84 n [589 nm, 25 C.]: 0.1098 Cp: 72.9 C. .sub.1 [25 C.]: 93 m Pa .Math. s.

Example 7

(22) TABLE-US-00011 Category Liquid crystal monomer code Content (%) III CCH-23 22.00 III CCH-34 5.00 III CCH-35 5.00 II CY-3-O2 11.00 II CCY-3-O2 6.00 II CLY-3-O2 10.00 II CPY-2-O2 10.00 II CPY-3-O2 10.00 II PY-3-O2 5.00 II PY-2O-O2 5.00 II PY-2O-O4 5.00 II PPY-5-O2 3.00 I PUQY-3-O2 3.00 [1 KHz, 25 C.]: 4.09 .sub.: 8.04 n [589 nm, 25 C.]: 0.1149 Cp: 80.9 C. .sub.1[25 C.]: 109 m Pa .Math. s.

Example 8

(23) TABLE-US-00012 Category Liquid crystal monomer code Content (%) III CCH-23 18.75 III CC-3-V1 8.00 II COY-3-O2 4.00 III CP-3-O1 10.50 III CCP-3-O1 5.00 II CCOY-2-O2 10.75 II CCOY-3-O2 8.25 II CCOY-4-O2 11.25 III CPP-1V-2 4.25 II PY-3-O2 8.25 I PUQY-3-O2 5.00 I PUQY-3-O4 6.00 [1 KHz, 25 C.]: 3.69 .sub.: 7.75 n [589 nm, 25 C.]: 0.0996 Cp: 81.0 C. .sub.1[25 C.]: 161 m Pa .Math. s.

Example 9

(24) TABLE-US-00013 Category Liquid crystal monomer code Content (%) III CC-3-V 23.00 III CC-3-V1 9.00 III CC-V-V1 20.00 II CCOY-2-O2 3.00 II CCOY-3-O2 8.00 II CCOY-4-O2 5.00 III CPP-1V-2 8.00 IV DFDBF-Cp1O-O4 4.00 IV DFDBF-Cp1O-O5 4.00 I PGUQY-3-O2 3.00 I PUQY-3-O2 6.50 I PUQY-3-O4 6.50 [1KHz, 25 C.]: 1.88 .sub.: 5.77 n [589 nm, 25 C.]: 0.1020 Cp: 83.5 C. .sub.1[25 C.]: 80 m Pa .Math. s.

Example 10

(25) TABLE-US-00014 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CCP-3-O1 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PUQY-3-O2 4.00 I PUQY-3-O4 4.00 [1 KHz, 25 C.]: 5.60 .sub.: 10.10 n [589 nm, 25 C.]: 0.0990 Cp: 87.8 C. .sub.1[25 C.]: 156 m Pa .Math. s.

Example 11

(26) TABLE-US-00015 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CCP-3-O1 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PUQY-Cp-O2 4.00 I PUQY-Cpr1-O2 4.00 [1 KHz, 25 C.]: 5.60 .sub.: 10.10 n [589 nm, 25 C.]: 0.1000 Cp: 90.0 C. .sub.1[25 C.]: 60 m Pa .Math. s.

Example 12

(27) TABLE-US-00016 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CCP-3-O1 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PUQDFDBF-3-O2 4.00 I PQDFDBF-3-O2 4.00 [1 KHz, 25 C.]: 5.80 .sub.: 10.30 n [589 nm, 25 C.]: 0.0960 Cp: 85.0 C. .sub.1[25 C.]: 150 m Pa .Math. s.

Example 13

(28) TABLE-US-00017 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CCP-3-O1 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PUQBHHO-3-O2 4.00 I GQDFDBF-3-O2 4.00 [1 KHz, 25 C.]: 6.00 .sub.: 10.70 n [589 nm, 25 C.]: 0.0950 Cp: 89.0 C. .sub.1[25 C.]: 160 m Pa .Math. s.

Example 14

(29) TABLE-US-00018 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CCP-3-O1 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PQBHHO-3-O2 4.00 I GQBHHO-3-O2 4.00 [1 KHz, 25 C.]: 6.00 .sub.: 10.60 n [589 nm, 25 C.]: 0.0990 Cp: 87.0 C. .sub.1[25 C.]: 165 m Pa .Math. s.

Example 15

(30) TABLE-US-00019 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 29.00 III CPP-V-3 2.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 II PY-3-O2 12.00 I PUQY-3-O2 4.00 I PUQY-3-O4 4.00 [1 KHz, 25 C.]: 5.60 .sub.: 10.10 n [589 nm, 25 C.]: 0.1000 Cp: 85.0 C. .sub.1[25 C.]: 150 m Pa .Math. s.

Example 16

(31) TABLE-US-00020 Category Liquid crystal monomer code Content (%) III CC-3-V 19.00 III CC-3-V1 9.00 III CC-V-V1 20.00 II CCOY-2-O2 3.00 II CCOY-3-O2 8.00 II CCOY-4-O2 5.00 III CPP-1V-2 8.00 IV DFDBF-Cp1O-O4 4.00 IV DFDBF-Cp1O-O5 4.00 I PUQY-Cp-O2 10.00 I PUQY-Cpr1-O4 10.0 [1 KHz, 25 C.]: 2.10 .sub.: 5.99 n [589 nm, 25 C.]: 0.1106 Cp: 82.5 C. .sub.1[25 C.]: 97 m Pa .Math. s.

Example 17

(32) TABLE-US-00021 Category Liquid crystal monomer code Content (%) III CC-3-V 19.00 III CC-3-V1 9.00 III CC-V-V1 20.00 II CCOY-2-O2 3.00 II CCOY-3-O2 8.00 II CCOY-4-O2 5.00 III CPP-1V-2 8.00 IV DFDBF-Cp1O-O4 4.00 IV DFDBF-Cp1O-O5 4.00 I PUQDFDBF-3-O2 10.00 I PQDFDBF-3-O2 10.0 [1 KHz, 25 C.]: 2.31 .sub.: 6.20 n [589 nm, 25 C.]: 0.1012 Cp: 80.5 C. .sub.1[25 C.]: 90 m Pa .Math. s.

Example 18

(33) TABLE-US-00022 Category Liquid crystal monomer code Content (%) III CC-3-V 19.00 III CC-3-V1 9.00 III CC-V-V1 20.00 II CCOY-2-O2 3.00 II CCOY-3-O2 8.00 II CCOY-4-O2 5.00 III CPP-1V-2 8.00 IV DFDBF-Cp1O-O4 4.00 IV DFDBF-Cp1O-O5 4.00 I GQDFDBF-3-O2 10.00 I PUQBHHO-3-O2 10.0 [1 KHz, 25 C.]: 2.40 .sub.: 6.29 n [589 nm, 25 C.]: 0.1005 Cp: 83.4 C. .sub.1[25 C.]: 94 m Pa .Math. s.

Example 19

(34) TABLE-US-00023 Category Liquid crystal monomer code Content (%) III CC-3-V 19.00 III CC-3-V1 9.00 III CC-V-V1 20.00 II CCOY-2-O2 3.00 II CCOY-3-O2 8.00 II CCOY-4-O2 5.00 III CPP-1V-2 8.00 IV DFDBF-Cp1O-O4 4.00 IV DFDBF-Cp1O-O5 4.00 I PQBHHO-3-O2 10.00 I GQBHHO-3-O2 10.00 249 [1 KHz, 25 C.]: 2.42 .sub.: 6.31 n [589 nm, 25 C.]: 0.1060 Cp: 80.8 C. .sub.1[25 C.]: 94 m Pa .Math. s.

Example 20

(35) TABLE-US-00024 Category Liquid crystal monomer code Content (%) III CC-3-V1 12.00 III CC-V-V1 4.00 II CCOY-2-O2 13.00 II CCOY-3-O2 13.00 II CCOY-4-O2 13.00 II PY-Cp-O2 15.00 II PY-Cpr1-O2 10.00 I DUQY-5-O2 20.00 [1 KHz, 25 C.]: 5.40 .sub.: 9.90 n [589 nm, 25 C.]: 0.1000 Cp: 75.4 C. .sub.1[25 C.]: 160 m Pa .Math. s.

Example 21

(36) TABLE-US-00025 Category Liquid crystal monomer code Content (%) IV BHHO-Cp1O-O4FF 4.00 III CC-3-V 25.00 II CCOY-2-O2 15.00 II CCOY-3-O2 15.00 II CCOY-4-O2 15.00 V PGP-Cpr1-F 12.00 II PY-3-O2 10.00 I PUQY-3-O2 2.00 I PUQY-3-O4 2.00 [1 KHz, 25 C.]: 4.60 .sub.: 9.10 n [589 nm, 25 C.]: 0.1119 Cp: 91.5 C. .sub.1[25 C.]: 166 m Pa .Math. s.

(37) The liquid crystal composition of the present invention has a good stability against light and heat, a lower viscosity, a wider refractive index that may be achieved by adjustment, and a higher clearing point (a very wide service temperature range), and in particular, the liquid crystal composition has a higher light transmittance, thus allowing a display device to have a higher brightness or an energy saving effect.