Liquid crystal composition and liquid crystal display device

Abstract

A liquid crystal composition and the use thereof are provided. The liquid crystal composition comprises 15-30% by weight of three or more compounds of general formula I; the general formula I must comprises at least two compounds of general formula I-1; wherein, by weight of the total amount of the liquid crystal composition, the total amount of the compounds of general formula I-1 is no lower than 10%, and the content of each of the compounds of general formula I-1 is no higher than 8%. The liquid crystal composition has appropriately high optical anisotropy, higher dielectric anisotropy, lower threshold voltage, suitable elastic constant, suitable temperature range of nematic phase, good reliability and heat stability, and good low-temperature intersolubility. ##STR00001##

Claims

1. A liquid crystal composition comprising: (a) 15-30% by weight of the total amount of the liquid crystal composition of three or more compounds of general formula I ##STR00046## in which, R.sub.1 represents C.sub.1-5 alkyl or alkoxy, or C.sub.2-5 alkenyl or alkenoxy; Y.sub.1 and Y.sub.2 are same or different, and each independently represents H, F, or methyl or methoxyl which is with or without halogen substituent; ##STR00047## is selected from a group consisting of ##STR00048## is selected from a group consisting of ##STR00049## X.sub.1 represents F, Cl, or C.sub.1-5 alkyl or alkoxy which is with or without halogen substituent; wherein the three or more compounds of general formula I comprise at least two compounds of general formula I-1, ##STR00050## R.sub.1, Y.sub.1, Y.sub.2 and X.sub.1 are as defined in general formula I; wherein the total amount of the at least two compounds of general formula I-1 comprise no lower than 10% by weight of the total amount of the liquid crystal composition, and the content of each of the compounds of general formula I-1 is no higher than 8%; (b) 6-19% by weight of the total amount of the liquid crystal composition of at least one compound selected from the group consisting of compounds of general formula IV-1, compounds of general formula IV-2, and compounds of general formula IV-3: ##STR00051## and (c) one or more stabilizers selected from the group consisting of: ##STR00052## wherein n=3; and wherein the liquid crystal composition has a dielectric constant anisotropy () from 11 to 13.5.

2. The liquid crystal composition according to claim 1, wherein the three or more compounds of general formula I comprise: 10-30% by weight of the total amount of the liquid crystal composition of at least two compounds of general formula I-1 ##STR00053## and 0-15% by weight of the total amount of the liquid crystal composition of at least one compound of general formula I-2 ##STR00054## in which, R.sub.1 and R.sub.1A are same or different, and each independently represents C.sub.1-5 alkyl or alkoxy, or C.sub.2-5 alkenyl or alkenoxy; Y.sub.1, Y.sub.2, Y.sub.1A and Y.sub.2A are same or different, and each independently represents H, F, or methyl or methoxyl which is with or without halogen substituent; Y.sub.3A represents H or F; ##STR00055## is selected from a group consisting of ##STR00056## Y.sub.3A represents H; X.sub.1 and X.sub.1A are same or different, and each independently represents F, Cl, or C.sub.1-5 alkyl or alkoxy which is with or without halogen substituent.

3. The liquid crystal composition according to claim 2, wherein the R.sub.1 and the R.sub.1A are same or different, and each independently represents C.sub.1-5 alkyl, Y.sub.1, Y.sub.2, Y.sub.1A, Y.sub.2A and Y.sub.3A are same or different, and each independently is H or F; X.sub.1 and X.sub.1A are same or different, and each independently represents F, CF.sub.3 or OCF.sub.3.

4. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises: 10-50% by weight of the total amount of the liquid crystal composition of one or more compounds of general formula II ##STR00057## in which, R.sub.2 and R.sub.3 are same or different, and each independently represents C.sub.1-5 alkyl or alkoxy, or C.sub.2-5 alkenyl or alkenoxy.

5. The liquid crystal composition according to claim 4, wherein the liquid crystal composition further comprises: 0-50% by weight of the total amount of the liquid crystal composition of one or more compounds selected from a group consisting of compounds of general formula III-1, general formula III-2 and general formula III-3 ##STR00058## in which, R.sub.4, R.sub.5 and R.sub.6 are same or different, and each independently represents C.sub.1-5 alkyl or alkoxy, or C.sub.2-5 alkenyl or alkenoxy; Y.sub.4, Y.sub.5, Y.sub.6, Y.sub.7, Y.sub.8, Y.sub.9 and Y.sub.10 are same or different, and each independently is H, F, or methyl or methoxyl which is with or without halogen substituent; X.sub.2 represents F, Cl, or C.sub.1-5 alkyl or alkoxy which is with or without halogen substituent.

6. The liquid crystal composition according to claim 2, wherein the compound of general formula I-1 is selected from a group consisting of the following compounds: ##STR00059## ##STR00060## and the compound of general formula I-2 is selected from a group consisting of the following compounds: ##STR00061## ##STR00062##

7. The liquid crystal composition according to claim 4, wherein the compound of general formula II is selected from a group consisting of the following compounds: ##STR00063##

8. The liquid crystal composition according to claim 5, wherein the compound of general formula III-1 is selected from a group consisting of the following compounds: ##STR00064## ##STR00065## the compound of general formula III-2 is selected from a group consisting of the following compounds: ##STR00066## and the compound of general formula III-3 is selected from a group consisting of the following compounds: ##STR00067##

9. The liquid crystal composition according to claim 5, wherein the liquid crystal composition further comprises one or more compounds selected from a group consisting of the following compounds: ##STR00068## ##STR00069##

10. The liquid crystal composition according to claim 5, wherein the liquid crystal composition further comprises: 0-40% by weight of the total amount of the liquid crystal composition of one or more compounds selected from a group consisting of compounds of formula V-1 to formula V-8 ##STR00070## in which, R.sub.8 and R.sub.9 are same or different, and each independently represents C.sub.1-5 alkyl or alkoxy, or C.sub.2-5 alkenyl or alkenoxy.

11. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises one or more additives.

12. A liquid crystal display device comprising the liquid crystal composition of claim 1.

Description

DETAILED EMBODIMENTS

(1) The present invention will be illustrated by combining the detailed embodiments below. It should be noted that, the following examples are exemplary embodiments of the present invention, which are only used to illustrate the present invention, not to limit it. Other combinations and various modifications within the conception of the present invention are possible without departing from the subject matter and scope of the present invention.

(2) For the convenience of the expression, the group structures of the liquid crystal compounds in the following Examples are represented by the codes listed in Table 1:

(3) TABLE-US-00001 TABLE 1 Codes of the group structures of the liquid crystal compounds Unit structure of the group Code Name of the group C 1,4-cyclohexylidene P 1,4-phenylene 0 G 2-fluoro-1,4-phenylene U 2,5-difluoro-1,4-phenylene A oxanyl D dioxanyl I indan-2,5-diyl F F fluorine substituent CHCH V alkenyl CF.sub.2O Q difluoro ether group CF.sub.3 CF3 trifluoromethyl OCF.sub.3 OCF3 trifluoromethoxy C.sub.nH.sub.2n+1 or C.sub.mH.sub.2m+1 n or m alkyl

(4) Take the following structural formula as an example:

(5) ##STR00045##

(6) Represented by the codes listed in Table 2, this structural formula can be expressed as nCPUF, in which, the n in the code represents the number of the carbon atoms of the alkyl group on the left, for example, n is 3, meaning that the alkyl is C.sub.3H.sub.7; the C in the code represents cyclohexyl.

(7) The abbreviated codes of the test items in the following Examples are as follows: Cp ( C.) clearing point (nematic-isotropy phase transition temperature) n: optical anisotropy (589 nm, 25 C.) : dielectric constant anisotropy (1 KHz, 25 C.) 1: rotational viscosity (mPa*s, at 25 C.) K.sub.11: elastic constant (splay, the pN at 25 C.) K.sub.33: elastic constant (blend, the pN at 25 C.) LTS (bottle at 25 C.): low-temperature storage time (at 25 C.) LTS (bottle at 30 C.): low-temperature storage time (at 30 C.) VHR (initial): voltage holding ratio (%) VHR (high temperature): voltage holding ratio after holding at high temperature of 150 C. for 1 h (%)

(8) In which, the optical anisotropy is tested and obtained by using abbe refractometer under sodium lamp (589 nm) light source at 20 C.; the dielectric test cell is the TN90 type with a cell gap is 7 m.

(9) =|, in which, | all is a dielectric constant parallel to the molecular axis, is a dielectric constant perpendicular to the molecular axis, with the test conditions: 25 C., 1 KHz, TN90 type test cell with a cell gap of 7 m.

(10) 1 is tested and obtained by the TOY06254 type liquid crystal physical property evaluation system; the test temperature is 25 C., and the test voltage is 90 V.

(11) VHR (initial) is tested and obtained by the TOY06254 type liquid crystal physical property evaluation system; the test temperature is 60 C., the test voltage is 5 V, and the test frequency is 6 Hz.

(12) VHR (high temperature) is tested and obtained by the TOY06254 type liquid crystal physical property evaluation system; the liquid crystal is tested after being held at a high temperature of 150 C. for 1 h, the test temperature is 60 C., the test voltage is 5 V, and the test frequency is 6 Hz.

Example 1

(13) The liquid crystal composition of Example 1 is prepared according to each compound and weight percentage listed in Table 2, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(14) TABLE-US-00002 TABLE 2 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2IUQUF IV-1 6 n 0.109 3IUQUF IV-2 8 12.6 3PGUQUF I-1-2 6 Cp 78.7 4PGUQUF I-1-3 6 1 81 5PGUQUF I-1-4 6 K.sub.11 12.7 2PGUQPOCF3 I-1-8 5 K.sub.33 14.3 3PGUQPOCF3 I-1-9 3 LTS (bottle >1500 h at 25 C.) 2CCGF III-1-1 2 LTS (bottle >1500 h at 30 C.) 3CCGF III-1-2 8 VHR (initial) 97.5 4CCGF III-1-3 3 VHR (high 97.1 temperature) 5CCGF III-1-4 5 3CCPOCF3 III-1-10 9 3CCV II-6 33 Total 100

Example 2

(15) The liquid crystal composition of Example 2 is prepared according to each compound and weight percentage listed in Table 3, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(16) TABLE-US-00003 TABLE 3 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2IUQUF IV-1 8 n 0.107 3IUQUF IV-2 8 12.7 3PGUQUF I-1-2 5 Cp 80.2 4PGUQUF I-1-3 5 1 84 5PGUQUF I-1-4 5 K.sub.11 12.2 2PGUQPOCF3 I-1-8 3 K.sub.33 14.3 3PGUQPOCF3 I-1-9 4 LTS (bottle >1000 h at 25 C.) 3CCGF III-1-2 10 LTS (bottle >1000 h at 30 C.) 4CCGF III-1-3 8 VHR (initial) 97.2 3CCPOCF3 III-1-10 15 VHR (high 96.9 temperature) 3CCV II-6 29 Total 100

Example 3

(17) The liquid crystal composition of Example 3 is prepared according to each compound and weight percentage listed in Table 4, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(18) TABLE-US-00004 TABLE 4 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2IUQUF IV-1 6.5 n 0.108 3IUQUF IV-2 8 12.8 3PGUQUF I-1-2 6 Cp 80.8 4PGUQUF I-1-3 6 1 90 5PGUQUF I-1-4 6 K.sub.11 12.6 2PGUQPOCF3 I-1-8 5 K.sub.33 14.1 3PGUQPOCF3 I-1-9 2.5 LTS (bottle >1000 h at 25 C.) 2CCGF III-1-1 4.5 LTS (bottle >1000 h at 30 C.) 3CCGF III-1-2 7 VHR (initial) 97.7 4CCGF III-1-3 5 VHR (high 97.6 temperature) 3CCPOCF3 III-1-10 10 3CPPC3 V-6 1.5 3CCV II-6 22 3CC2 II-2 10 Total 100

Example 4

(19) The liquid crystal composition of Example 4 is prepared according to each compound and weight percentage listed in Table 5, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(20) TABLE-US-00005 TABLE 5 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 3 n 0.112 3PGUQUF I-1-2 4 13.5 4PGUQUF I-1-3 3 Cp 75 3APUQUF I-2-7 5 1 87 2PUQUF IV-10 8 K.sub.11 13.5 3PUQUF IV-11 14 K.sub.33 15.2 3IUQUF IV-2 6 LTS (bottle >1000 h at 25 C.) 2CCUF III-1-5 4 LTS (bottle >1000 h at 30 C.) 3CCUF III-1-6 8 VHR (initial) 97.2 3CCPUF III-3-2 4 VHR (high 96.7 temperature) 4CCPUF III-3-3 4 3CCP1 V-3 4 3CCV II-6 28 3CGPC3 V-7 5 Total 100

Example 5

(21) The liquid crystal composition of Example 5 is prepared according to each compound and weight percentage listed in Table 6, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(22) TABLE-US-00006 TABLE 6 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQPOCF3 I-1-8 3 n 0.11 3PGUQPOCF3 I-1-9 4 12.1 4PGUQPOCF3 I-1-10 4 Cp 78.9 3DPUQUF I-2-12 5 1 82 2IUQUF IV-1 8 K.sub.11 13.7 3IUQUF IV-2 8 K.sub.33 15.3 3DUQUF IV-7 4 LTS (bottle >1000 h at 25 C.) 3AUQUF IV-4 4 LTS (bottle >1000 h at 30 C.) 3CCUF III-1-6 6 VHR (initial) 97.1 3CCPUF III-3-2 6 VHR (high 96.5 temperature) 3CPUF III-2-5 6 3CCP3 V-3 9 3CCV II-6 30 3CPPC3 V-6 3 Total 100

Example 6

(23) The liquid crystal composition of Example 6 is prepared according to each compound and weight percentage listed in Table 7, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(24) TABLE-US-00007 TABLE 7 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 5 n 0.11 3PGUQUF I-1-2 5 12.3 4PGUQUF I-1-3 5 Cp 73 2PUQUF IV-10 10 1 85 3PUQUF IV-11 16 K.sub.11 12.9 3CCGF III-1-2 6 K.sub.33 14.8 4CCGF III-1-3 4 LTS (bottle >1000 h at 25 C.) 3CCPOCF3 III-1-10 8 LTS (bottle >1000 h at 30 C.) 3CPP2 V-4 6 VHR (initial) 97.4 3CCV II-6 25 VHR (high 97.0 temperature) 3CPO2 V-1 6 5CPPC3 V-6 4 Total 100

Example 7

(25) The liquid crystal composition of Example 7 is prepared according to each compound and weight percentage listed in Table 8, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(26) TABLE-US-00008 TABLE 8 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQPCF3 I-1-5 4 n 0.109 3PGUQPCF3 I-1-6 4 11 4PGUQPCF3 I-1-7 4 Cp 72.1 3CGUQUF I-2-5 3 1 79 3CPUQUF I-2-2 3 K.sub.11 13.2 3PUQUF IV-11 8 K.sub.33 14.4 2IUQUF IV-1 6 LTS (bottle >1000 h at 25 C.) 3IUQUF IV-2 8 LTS (bottle >1000 h at 30 C.) 3CCUF III-1-6 6 VHR (initial) 97.6 5CCUF III-1-8 5 VHR (high 97.0 temperature) 3CCV II-6 28 3CCV1 II-7 5 3PP2 V-2 5 3CPPC3 V-6 3 3PGPF V-5 4 2PGPC4 V-8 4 Total 100

Example 8

(27) The liquid crystal composition of Example 8 is prepared according to each compound and weight percentage listed in Table 9, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(28) TABLE-US-00009 TABLE 9 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 4 n 0.107 3PGUQUF I-1-2 4 11.8 4PGUQUF I-1-3 4 Cp 74.2 3PGUQPOCF3 I-1-9 4 1 77 2DPUQUF I-2-11 4 K.sub.11 13.1 2IUQUF IV-1 8 K.sub.33 14.4 3IUQUF IV-2 11 LTS (bottle >1000 h at 25 C.) 2CCPUF III-3-1 4 LTS (bottle >1000 h at 30 C.) 2CCGF III-1-1 4 VHR (initial) 97.3 3CCGF III-1-2 6 VHR (high 96.9 temperature) 4CCGF III-1-3 6 V2CCP1 V-3 4 3CCV II-6 29 5CCV II-9 6 5CGPC3 V-7 2 Total 100

Example 9

(29) The liquid crystal composition of Example 9 is prepared according to each compound and weight percentage listed in Table 10, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(30) TABLE-US-00010 TABLE 10 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQPOCF3 I-1-8 5 n 0.121 3PGUQPOCF3 I-1-9 5 11.2 4PGUQPOCF3 I-1-10 5 Cp 95.1 5PGUQPOCF3 I-1-11 5 1 99 3PPUQUF I-2-15 2 K.sub.11 14.8 2PUQUF IV-10 6 K.sub.33 16.2 3PUQUF IV-11 10 LTS (bottle >1000 h at 25 C.) 5CCGF III-1-4 6 LTS (bottle >1000 h at 30 C.) 2CCPOCF3 III-1-9 9 VHR (initial) 97.4 3CCPOCF3 III-1-10 10 VHR (high 96.8 temperature) 3CCV II-6 31 3PGPC2 V-8 3 2PGPC3 V-8 3 Total 100

Example 10

(31) The liquid crystal composition of Example 10 is prepared according to each compound and weight percentage listed in Table 11, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(32) TABLE-US-00011 TABLE 11 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 4 n 0.117 3PGUQUF I-1-2 4 10.3 2PGUQPOCF3 I-1-8 3 Cp 72.7 3PGUQPOCF3 I-1-9 4 1 73 4PGUQPOCF3 I-1-10 3 K.sub.11 14.1 2APUQUF I-2-7 3 K.sub.33 15.2 3APUQUF I-2-8 4 LTS (bottle >1000 h at 25 C.) 2PUQUF IV-10 3 LTS (bottle >1000 h at 30 C.) 3PUQUF IV-11 3 VHR (initial) 97.7 3DUQUF IV-7 3 VHR (high 97.4 temperature) 3AUQUF IV-4 3 VCCP1 V-3 12 3CCV II-6 30 3CCV1 II-7 10 5PP1 V-2 8 3PGPC4 V-8 3 Total 100

Example 11

(33) The liquid crystal composition of Example 11 is prepared according to each compound and weight percentage listed in Table 12, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(34) TABLE-US-00012 TABLE 12 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQPOCF3 I-1-8 6 n 0.125 3PGUQPOCF3 I-1-9 8 9.5 4PGUQPOCF3 I-1-10 8 Cp 100.3 3CPUQUF I-2-2 5 1 88 3PUQUF IV-11 10 K.sub.11 13.3 3CPPO1 V-4 5 K.sub.33 14.2 3CCP3 V-3 8 LTS (bottle >1000 h at 25 C.) 3CCV II-6 23 LTS (bottle >1000 h at 30 C.) 3CPO1 V-1 8 VHR (initial) 97.8 3CPO2 V-1 7 VHR (high 97.3 temperature) 3CPPC3 V-6 3 3CPPC5 V-6 3 2PGPF V-5 2 3PGPF V-5 2 4PGPF V-5 2 Total 100

Example 12

(35) The liquid crystal composition of Example 12 is prepared according to each compound and weight percentage listed in Table 13, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(36) TABLE-US-00013 TABLE 13 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 3PGUQUF I-1-2 5 n 0.107 4PGUQUF I-1-3 4 8.5 3PGUQPOCF3 I-1-9 4 Cp 86.4 4PGUQPOCF3 I-1-10 4 1 67 3PGUQPCF3 I-1-6 4 K.sub.11 12.4 4PGUQPCF3 I-1-7 4 K.sub.33 14.8 3PPUQUF I-2-15 3 LTS (bottle >1000 h at 25 C.) 3CCP1 V-3 8 LTS (bottle >1000 h at 30 C.) VCCP1 V-3 10 VHR (initial) 98.0 3CCV II-6 40 VHR (high 97.8 temperature) 3CCV1 II-7 8 5CPO2 V-1 6 Total 100

Example 13

(37) The liquid crystal composition of Example 13 is prepared according to each compound and weight percentage listed in Table 14, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(38) TABLE-US-00014 TABLE 14 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 3PGUQPOCF3 I-I-9 3 n 0.109 4PGUQPOCF3 I-I-10 2 11.3 2PGUQPCF3 I-I-5 2 Cp 85 3PGUQPCF3 I-I-6 3 1 78 2APUQUF I-2-7 4 K.sub.11 14.3 3APUQUF I-2-8 4 K.sub.33 15 3CPUQUF I-2-2 7 LTS (bottle >1000 h at 25 C.) 3IUQUF IV-2 8 LTS (bottle >1000 h at 30 C.) 3CCUF III-I-6 8 VHR (initial) 97.5 4CCUF III-I-7 7 VHR (high 97.2 temperature) 2CCPUF III-3-1 4 3CCPUF III-3-2 4 5CPGF III-2-3 3 3CCV II-6 33 3CC2 II-2 4 4PGPF V-3 2 3PGPC2 V-8 2 Total 100

Example 14

(39) The liquid crystal composition of Example 14 is prepared according to each compound and weight percentage listed in Table 15, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(40) TABLE-US-00015 TABLE 15 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQPOCF3 I-1-8 3 n 0.096 3PGUQPOCF3 I-1-9 4 11.8 2PGUQPCF3 I-1-5 3 Cp 75.2 3PGUQPCF3 I-1-6 4 1 84 2DPUQUF I-2-7 5 K.sub.11 14 3DPUQUF I-2-8 5 K.sub.33 15.5 2IUQUF IV-1 6 LTS (bottle >1000 h at 25 C.) 3IUQUF IV-2 8 LTS (bottle >1000 h at 30 C.) 2CCGF III-1-1 4 VHR (initial) 97.7 3CCGF III-1-2 6 VHR (high 97.4 temperature) 4CCGF III-1-3 6 5CCGF III-1-4 5 3CCV II-6 25 4CC3 II-3 8 5CC2 II-4 8 Total 100

Example 15

(41) The liquid crystal composition of Example 15 is prepared according to each compound and weight percentage listed in Table 16, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(42) TABLE-US-00016 TABLE 16 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 5 n 0.116 3PGUQUF I-1-2 5 13.2 4PGUQUF I-1-3 5 Cp 82.5 2PGUQPOCF3 I-1-8 5 1 93 3PGUQPOCF3 I-1-9 5 K.sub.11 13.5 4PGUQPOCF3 I-1-10 5 K.sub.33 14.5 2IUQUF IV-1 6 LTS (bottle >1000 h at 25 C.) 3IUQUF IV-2 6 LTS (bottle >1000 h at 30 C.) 3CCGF III-1-2 8 VHR (initial) 97.3 4CCGF III-1-3 7 VHR (high 96.8 temperature) 2CCPOCF3 III-1-9 6 3CCPOCF3 III-1-10 7 3CCV II-6 20 3CC2 II-2 6 5CC3 II-5 4 Total 100

Example 16

(43) The liquid crystal composition of Example 16 is prepared according to each compound and weight percentage listed in Table 17, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(44) TABLE-US-00017 TABLE 17 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 6 n 0.114 3PGUQUF I-1-2 6 9.2 4PGUQUF I-1-3 6 Cp 71.4 3PGUQPCF3 I-1-6 3 1 72 4PGUQPCF3 I-1-7 3 K.sub.11 13 3IUQUF IV-2 4 K.sub.33 14.3 3CCP1 V-3 5 LTS (bottle >1000 h at 25 C.) 3CCP3 V-3 5 LTS (bottle >1000 h at 30 C.) 3CPP2 V-4 5 VHR (initial) 97.9 3CCV II-6 35 VHR (high 97.7 temperature) 5CCV II-9 6 3CPO2 V-1 8 3PP2 V-2 6 3PGPF V-5 2 Total 100

Example 17

(45) The liquid crystal composition of Example 17 is prepared according to each compound and weight percentage listed in Table 18, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(46) TABLE-US-00018 TABLE 18 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 3PGUQUF I-1-2 7 n 0.112 4PGUQUF I-1-3 7 12.31 2PGUQPCF3 I-1-5 6 Cp 76.9 3PGUQPCF3 I-1-6 7 1 85 3CPUQUF I-2-2 2 K.sub.11 14.1 3DUQUF IV-7 3 K.sub.33 15.2 3AUQUF IV-4 3 LTS (bottle >1000 h at 25 C.) 3CCPUF III-3-2 3 LTS (bottle >1000 h at 30 C.) 5CCPUF III-3-4 2 VHR (initial) 97.2 3CPUF III-2-5 11 VHR (high 97.0 temperature) 5CPUF III-2-7 5 3CCV II-6 24 3CC2 II-2 12 4CC3 II-3 8 Total 100

Example 18

(47) The liquid crystal composition of Example 18 is prepared according to each compound and weight percentage listed in Table 19, and then tested by filling the same between two substrates of a liquid crystal display device. The test data is shown in the Table below:

(48) TABLE-US-00019 TABLE 19 Formulation of the liquid crystal composition and its test performance Code of No. of Content Test results for the component compound percentage performance parameters 2PGUQUF I-1-1 3 n 0.116 3PGUQUF I-1-2 3 10.4 4PGUQUF I-1-3 3 Cp 84 2PGUQPOCF3 I-1-8 6 1 74 3PGUQPOCF3 I-1-9 8 K.sub.11 13.8 4PGUQPOCF3 I-1-10 7 K.sub.33 14.9 3CCGF III-1-2 6 LTS (bottle >1000 h at 25 C.) 4CCGF III-1-3 6 LTS (bottle >1000 h at 30 C.) 2CCPOCF3 III-1-9 5 VHR (initial) 97.5 3CCV II-6 39 VHR (high 97.2 temperature) 4CCV II-8 6 3PGPF V-5 3 4PGPF V-5 3 5PGPF V-5 2 Total 100

(49) It can be seen from the test data of the above Examples that the liquid crystal composition provided by the present invention has appropriately high optical anisotropy, higher optical anisotropy, lower threshold voltage, suitable temperature range of nematic phase, suitable elastic constant, lower viscosity, good reliability and heat stability, and good low-temperature intersolubility, and is applicable to IPS, TN-TFT liquid crystal displays.