Liquid crystal composition and liquid crystal display device

Abstract

A liquid crystal composition comprises a compound of general formula I serving as a first component; a compound of general formula II-1 and/or general formula II-2 serving as a second component; a compound of general formula III serving as a third component; a compound of general formula IV serving as a fourth component; a compound of general formula V serving as a fifth component; and a compound of general formula VI serving as a sixth component. The liquid crystal composition has at least one characteristic among the characteristics of a large dielectric anisotropy, a large optical anisotropy, a high voltage holding ratio and a low threshold voltage and the like, and is suitable to be used in a liquid crystal display device. Additionally, a liquid crystal display device comprising the liquid crystal composition is also provided.

Claims

1. A liquid crystal composition, comprising: 5-30% by weight of the total amount of the liquid crystal composition of a first component, said first component being one or more compounds of general formula I ##STR00100## 5-25% by weight of the total amount of the liquid crystal composition of a second component, said second component being one or more compounds of general formula II-1 and/or general formula II-2 ##STR00101## 1-15% by weight of the total amount of the liquid crystal composition of a third component, said third component being one or more compounds of general formula III ##STR00102## 5-50% by weight of the total amount of the liquid crystal composition of a fourth component, said fourth component being one or more compounds of general formula IV ##STR00103## 5-45% by weight of the total amount of the liquid crystal composition of a fifth component, said fifth component being one or more compounds of general formula V ##STR00104## and 1-50% by weight of the total amount of the liquid crystal composition of a sixth component, said sixth component being one or more compounds of general formula VI ##STR00105## in which: R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.6, R.sub.7 and R.sub.8 are same or different, and each independently represents C.sub.1-C.sub.7 alkyl substituted by fluorine or unsubstituted by fluorine, C.sub.1-C.sub.7 alkoxy substituted by fluorine or unsubstituted by fluorine, or C.sub.2-C.sub.7 alkenyl substituted by fluorine or unsubstituted by fluorine; R.sub.5 represents H, C.sub.1-C.sub.7 alkyl substituted by fluorine or unsubstituted by fluorine, C.sub.1-C.sub.7 alkoxy substituted by fluorine or unsubstituted by fluorine, or C.sub.2-C.sub.7 alkenyl substituted by fluorine or unsubstituted by fluorine; ##STR00106## represents ##STR00107## one or more H on the ##STR00108## can be substituted by F; Ring ##STR00109## ring ##STR00110## ring ##STR00111## ring ##STR00112## and ring ##STR00113## are same or different, and each independently represents ##STR00114## Ring ##STR00115## ring ##STR00116## ring ##STR00117## and ring ##STR00118## are same or different, and each independently represents ##STR00119## L.sub.1 and L.sub.2 are same or different, and each independently represents H or F; Z.sub.1 and Z.sub.2 are same or different, and each independently represents single bond, COO, CH.sub.2CH.sub.2 or CH.sub.2O; Z.sub.3 and Z.sub.4 are same or different, and each independently represents single bond, COO or CH.sub.2O; a represents 0, 1 or 2, and when a is 2, rings ##STR00120## can be same or different; b, d and e are same or different, and each independently represents 0 or 1; in which, when d=e=0, d=1 and e=0 or d=0 and e=1, ring ##STR00121## and ring ##STR00122## are not simultaneously ##STR00123##

2. The liquid crystal composition according to claim 1, characterized in that the compound of general formula I is selected from a group consisting of the following compounds: ##STR00124##

3. The liquid crystal composition according to claim 1, characterized in that the compound of general formula II-1 is selected from a group consisting of the following compounds: ##STR00125##

4. The liquid crystal composition according to claim 1, characterized in that the compound of general formula II-2 is selected from a group consisting of the following compounds: ##STR00126##

5. The liquid crystal composition according to claim 1, characterized in that the compound of general formula III is selected from a group consisting of the following compounds: ##STR00127##

6. The liquid crystal composition according to claim 1, characterized in that the compound of general formula IV is selected from a group consisting of the following compounds: ##STR00128## in which, R.sub.5 represents C.sub.1-C.sub.7 alkyl substituted by fluorine or unsubstituted by fluorine, C1-C7 alkoxy substituted by fluorine or unsubstituted by fluorine.

7. The liquid crystal composition according to claim 6, characterized in that the compound of general formula IV-1 is selected from a group consisting of the following compounds: ##STR00129## the compound of general formula IV-2 is selected from a group consisting of the following compounds: ##STR00130## the compound of general formula IV-3 is selected from a group consisting of the following compounds: ##STR00131## the compound of general formula IV-4 is selected from a group consisting of the following compounds: ##STR00132## the compound of general formula IV-5 is selected from a group consisting of the following compounds: ##STR00133## the compound of general formula IV-6 is selected from a group consisting of the following compounds: ##STR00134## the compound of general formula IV-7 is selected from a group consisting of the following compounds: ##STR00135## the compound of general formula IV-8 is selected from a group consisting of the following compounds: ##STR00136## the compound of general formula IV-9 is selected from a group consisting of the following compounds: ##STR00137## the compound of general formula IV-10 is selected from a group consisting of the following compounds: ##STR00138## the compound of general formula IV-11 is selected from a group consisting of the following compounds: ##STR00139##

8. The liquid crystal composition according to claim 1, characterized in that the compound of general formula V is selected from a group consisting of the following compounds: ##STR00140## ##STR00141## in which, R.sub.6 represents C.sub.1-C.sub.5 alkyl substituted by fluorine or unsubstituted by fluorine, C.sub.1-C.sub.5 alkoxy substituted by fluorine or unsubstituted by fluorine, or C.sub.2-C.sub.5 alkenyl substituted by fluorine or unsubstituted by fluorine.

9. The liquid crystal composition according to claim 8, characterized in that the compound of general formula V-1 is selected from a group consisting of the following compounds: ##STR00142## the compound of general formula V-2 is selected from a group consisting of the following compounds: ##STR00143## the compound of general formula V-3 is selected from a group consisting of the following compounds: ##STR00144## the compound of general formula V-4 is selected from a group consisting of the following compounds: ##STR00145## the compound of general formula V-5 is selected from a group consisting of the following compounds: ##STR00146## the compound of general formula V-6 is selected from a group consisting of the following compounds: ##STR00147## the compound of general formula V-7 is selected from a group consisting of the following compounds: ##STR00148## the compound of general formula V-8 is selected from a group consisting of the following compounds: ##STR00149## the compound of general formula V-9 is selected from a group consisting of the following compounds: ##STR00150## the compound of general formula V-10 is selected from a group consisting of the following compounds: ##STR00151## the compound of general formula V-11 is selected from a group consisting of the following compounds: ##STR00152## the compound of general formula V-12 is selected from a group consisting of the following compounds: ##STR00153## the compound of general formula V-13 is selected from a group consisting of the following compounds: ##STR00154##

10. The liquid crystal composition according to claim 1, characterized in that the compound of general formula VI is selected from a group consisting of the following compounds: ##STR00155## in which, R.sub.7 and R.sub.8 are same or different, and each independently represents C.sub.1-C.sub.5 alkyl, C.sub.1-C.sub.5 alkoxy, C.sub.2-C.sub.5 alkenyl or C.sub.2-C.sub.5 alkenoxy.

11. The liquid crystal composition according to claim 10, characterized in that the compound of general formula VI-1 is selected from a group consisting of the following compounds: ##STR00156## the compound of general formula VI-2 is selected from a group consisting of the following compounds: ##STR00157## the compound of general formula VI-3 is selected from a group consisting of the following compounds: ##STR00158## ##STR00159## the compound of general formula VI-4 is selected from a group consisting of the following compounds: ##STR00160## ##STR00161## the compound of general formula VI-5 is selected from a group consisting of the following compounds: ##STR00162## the compound of general formula VI-6 is selected from a group consisting of the following compounds: ##STR00163## the compound of general formula VI-7 is selected from a group consisting of the following compounds: ##STR00164## the compound of general formula VI-8 is selected from a group consisting of the following compounds: ##STR00165## the compound of general formula VI-9 is selected from a group consisting of the following compounds: ##STR00166## the compound of general formula VI-10 is selected from a group consisting of the following compounds: ##STR00167##

12. The liquid crystal composition according to claim 1, characterized in that the first component comprises 5-15% by weight of the total amount of the liquid crystal composition; the second component comprises 10-20% by weight of the total amount of the liquid crystal composition; the third component comprises 1-10% by weight of the total amount of the liquid crystal composition; the fourth component comprises 10-45% by weight of the total amount of the liquid crystal composition; the fifth component comprises 5-35% by weight of the total amount of the liquid crystal composition; and the sixth component comprises 1-50% by weight of the total amount of the liquid crystal composition.

13. The liquid crystal composition according to claim 12, characterized in that the liquid crystal composition comprises: 3% by weight of the total amount of the liquid crystal composition of compound I-2; 5% by weight of the total amount of the liquid crystal composition of compound I-3; 3% by weight of the total amount of the liquid crystal composition of compound I-4; 5% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 6% by weight of the total amount of the liquid crystal composition of compound II-2-2; 3% by weight of the total amount of the liquid crystal composition of compound IV-9-2; 3% by weight of the total amount of the liquid crystal composition of compound IV-8-2; 5% by weight of the total amount of the liquid crystal composition of compound IV-8-3; 6% by weight of the total amount of the liquid crystal composition of compound IV-8-4; 4% by weight of the total amount of the liquid crystal composition of compound V-6-2; 6% by weight of the total amount of the liquid crystal composition of compound V-6-4; 2% by weight of the total amount of the liquid crystal composition of compound VI-4-6; 27% by weight of the total amount of the liquid crystal composition of compound VI-1-2; 10% by weight of the total amount of the liquid crystal composition of compound VI-1-15; and 6% by weight of the total amount of the liquid crystal composition of compound III-5, or the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound I-3; 4% by weight of the total amount of the liquid crystal composition of compound I-4; 3% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 5% by weight of the total amount of the liquid crystal composition of compound II-1-5; 9% by weight of the total amount of the liquid crystal composition of compound IV-1-1; 12% by weight of the total amount of the liquid crystal composition of compound IV-1-2; 20% by weight of the total amount of the liquid crystal composition of compound IV-5-2; 11% by weight of the total amount of the liquid crystal composition of compound V-6-2; 6% by weight of the total amount of the liquid crystal composition of compound V-5-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-1; 4% by weight of the total amount of the liquid crystal composition of compound V-10-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-3; 3% by weight of the total amount of the liquid crystal composition of compound VI-1-12; and 7% by weight of the total amount of the liquid crystal composition of compound III-5, or the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound I-2; 5% by weight of the total amount of the liquid crystal composition of compound I-4; 6% by weight of the total amount of the liquid crystal composition of compound II-1-2; 6% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 6% by weight of the total amount of the liquid crystal composition of compound IV-9-1; 5% by weight of the total amount of the liquid crystal composition of compound IV-9-2; 5% by weight of the total amount of the liquid crystal composition of compound V-5-1; 6% by weight of the total amount of the liquid crystal composition of compound V-5-2; 6% by weight of the total amount of the liquid crystal composition of compound V-10-1; 10% by weight of the total amount of the liquid crystal composition of compound V-10-2; 6% by weight of the total amount of the liquid crystal composition of compound V-10-3; 8% by weight of the total amount of the liquid crystal composition of compound VI-7-2; 18% by weight of the total amount of the liquid crystal composition of compound VI-1-12; and 3% by weight of the total amount of the liquid crystal composition of compound III-5, or the liquid crystal composition comprises: 3% by weight of the total amount of the liquid crystal composition of compound I-2; 5% by weight of the total amount of the liquid crystal composition of compound I-3; 5% by weight of the total amount of the liquid crystal composition of compound I-4; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 5% by weight of the total amount of the liquid crystal composition of compound II-2-2; 2% by weight of the total amount of the liquid crystal composition of compound IV-9-2; 3% by weight of the total amount of the liquid crystal composition of compound IV-10-2; 5% by weight of the total amount of the liquid crystal composition of compound IV-10-3; 5% by weight of the total amount of the liquid crystal composition of compound IV-10-4; 4% by weight of the total amount of the liquid crystal composition of compound V-6-2; 4% by weight of the total amount of the liquid crystal composition of compound V-6-3; 2% by weight of the total amount of the liquid crystal composition of compound VI-4-6; 37% by weight of the total amount of the liquid crystal composition of compound VI-1-12; 10% by weight of the total amount of the liquid crystal composition of compound VI-1-15; and 4% by weight of the total amount of the liquid crystal composition of compound III-5, or the liquid crystal composition comprises: 3% by weight of the total amount of the liquid crystal composition of compound I-3; 3% by weight of the total amount of the liquid crystal composition of compound I-4; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 5% by weight of the total amount of the liquid crystal composition of compound II-2-2; 12% by weight of the total amount of the liquid crystal composition of compound IV-1-1; 12% by weight of the total amount of the liquid crystal composition of compound IV-1-2; 14% by weight of the total amount of the liquid crystal composition of compound IV-5-2; 6% by weight of the total amount of the liquid crystal composition of compound IV-6-1; 5% by weight of the total amount of the liquid crystal composition of compound V-6-2; 6% by weight of the total amount of the liquid crystal composition of compound V-7-2; 7% by weight of the total amount of the liquid crystal composition of compound V-5-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-1; 4% by weight of the total amount of the liquid crystal composition of compound V-10-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-3; 6% by weight of the total amount of the liquid crystal composition of compound VI-1-12; and 5% by weight of the total amount of the liquid crystal composition of compound III-5, or the liquid crystal composition comprises: 3% by weight of the total amount of the liquid crystal composition of compound I-2; 3% by weight of the total amount of the liquid crystal composition of compound I-4; 5% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 6% by weight of the total amount of the liquid crystal composition of compound II-2-2; 3% by weight of the total amount of the liquid crystal composition of compound IV-9-2; 3% by weight of the total amount of the liquid crystal composition of compound IV-8-2; 5% by weight of the total amount of the liquid crystal composition of compound IV-8-3; 6% by weight of the total amount of the liquid crystal composition of compound IV-8-4; 5% by weight of the total amount of the liquid crystal composition of compound V-3-2; 5% by weight of the total amount of the liquid crystal composition of compound V-4-2; 4% by weight of the total amount of the liquid crystal composition of compound V-6-2; 6% by weight of the total amount of the liquid crystal composition of compound V-6-4; 2% by weight of the total amount of the liquid crystal composition of compound VI-4-6; 25% by weight of the total amount of the liquid crystal composition of compound VI-1-12; 10% by weight of the total amount of the liquid crystal composition of compound VI-1-15; and 3% by weight of the total amount of the liquid crystal composition of compound III-8, or the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound I-2; 5% by weight of the total amount of the liquid crystal composition of compound I-4; 6% by weight of the total amount of the liquid crystal composition of compound II-1-2; 6% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 6% by weight of the total amount of the liquid crystal composition of compound IV-9-1; 5% by weight of the total amount of the liquid crystal composition of compound IV-9-2; 5% by weight of the total amount of the liquid crystal composition of compound V-5-1; 5% by weight of the total amount of the liquid crystal composition of compound V-5-2; 6% by weight of the total amount of the liquid crystal composition of compound V-10-1; 10% by weight of the total amount of the liquid crystal composition of compound V-10-2; 6% by weight of the total amount of the liquid crystal composition of compound V-10-3; 12% by weight of the total amount of the liquid crystal composition of compound VI-1-12; 8% by weight of the total amount of the liquid crystal composition of compound VI-7-2; and 10% by weight of the total amount of the liquid crystal composition of compound III-4, or the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound I-1; 4% by weight of the total amount of the liquid crystal composition of compound I-2; 3% by weight of the total amount of the liquid crystal composition of compound II-1-3; 6% by weight of the total amount of the liquid crystal composition of compound II-1-4; 5% by weight of the total amount of the liquid crystal composition of compound II-1-5; 9% by weight of the total amount of the liquid crystal composition of compound IV-1-1; 12% by weight of the total amount of the liquid crystal composition of compound IV-1-2; 20% by weight of the total amount of the liquid crystal composition of compound IV-5-2; 11% by weight of the total amount of the liquid crystal composition of compound V-6-2; 6% by weight of the total amount of the liquid crystal composition of compound V-5-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-1; 4% by weight of the total amount of the liquid crystal composition of compound V-10-2; 3% by weight of the total amount of the liquid crystal composition of compound V-10-3; 3% by weight of the total amount of the liquid crystal composition of compound VI-1-12; and 7% by weight of the total amount of the liquid crystal composition of compound III-2.

14. 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 unit structures of the liquid crystal compounds in the following Examples are represented by the codes listed in Table 1:

(3) TABLE-US-00002 TABLE 1 The codes of the unit structures of the liquid crystal compounds Unit structure Code Name of the group C 1,4-cyclohexylidene P 1,4-phenylene G 2-fluoro-1,4-phenylene U 2,5-difluoro-1,4-phenylene A oxanyl D dioxanyl C(5) cyclopentyl I indane-2,5-diyl COO E ester group CF.sub.3 CF3 trifluoromethoxy F F fluorine CF.sub.2O Q difluoro-substituted ether group O O oxygen C.sub.nH.sub.2n+1 or C.sub.mH.sub.2m+1 n or m alkyl CHCH V ethenyl CH.sub.2CH.sub.2 2 ethane bridge bond

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

(5) ##STR00099##

(6) Represented by the codes listed in Table 1, this structural formula can be expressed as nCGUF, 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 2, meaning that the alkyl is C.sub.2H.sub.5; the C in the code represents cyclohexyl, the G in the code represents 2-fluoro-1,4-phenylene, the U in the code represents 2,5-difluoro-1,4-phenylene, the F in the code represents fluorine.

(7) The abbreviated codes of the test items in the following Examples are respectively represented as:

(8) n: optical anisotropy (589 nm, 20 C.)

(9) : dielectric anisotropy (1 KHz, 25 C.)

(10) Cp: clearing point (nematic-isotropy phase transition temperature, C.)

(11) Vth threshold voltage (1 KHz, 25 C., TN90)

(12) flow viscosity (mm.sup.2.Math.s.sup.1, 20 C., except as otherwise noted)

(13) VHR (initial) initial voltage holding ratio (%)

(14) in which, the optical anisotropy is tested and obtained by using abbe refractometer under sodium lamp (589 nm) light source at 25 C.; the dielectric test cell was the type TN90, and the cell gap was 7 m.

(15) VHR (initial) is tested and obtained by the TOY06254 type liquid crystal physical property evaluation system: impulse voltage: 5V 6 HZ, test temperature is 60 C. and the test unit period is 166.7 ms.

(16) Test conditions of Vth: C/1 KHZ, JTSB7.0.

(17) The ingredients used in the following Examples can be synthesized by well-known methods or obtained by commercial means. These synthetic techniques are routine, and the test results show that the liquid crystal compounds thus prepared meet the criteria for the electronic compounds.

(18) Several liquid crystal compositions are prepared according to the formulations of the liquid crystal compositions specified in the following Examples. The preparation of the liquid crystal compositions is proceeded according to the conventional methods in the art, and as an example, the compositions are prepared by mixing the specified formulation via the processing modes, such as heating, ultrasonic processing, suspending processing and so on.

(19) The liquid crystal composition specified in the following Examples are prepared and studied. The formulas of the liquid crystal compositions and their test results for the performance are shown below.

Comparative Example 1

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

(21) TABLE-US-00003 TABLE 2 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3C2CUF V-12-2 5 n 0.093 4C2CUF V-12-3 5 7.1 3CCEPC4 VI-10-4 4 Cp 98 2CGUF V-7-1 10 Vth 1.88 2DPUF I-1 6 16 3DPUF I-2 8 VHR (initial) 94.5 5CCUF V-5-4 6 3CCPUF V-10-2 4 2CCPUF V-10-1 4 4CCPUF V-10-3 4 2CCPOCF3 VI-7-1 6 3CCPOCF3 VI-7-2 5 VCCGF V-3-5 6 VCCP1 VI-8-1 6 3CCV VI-1-12 21 Total 100

Comparative Example 2

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

(23) TABLE-US-00004 TABLE 3 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 2CCPUF V-10-1 2 n 0.113 3CCPUF V-10-2 2 5.1 4CCPUF V-10-3 2 Cp 82 3CCGUF V-11-2 2.5 Vth 2.43 3PGP4 5 10.9 2PGP3 11 2PGUF 6 3PGUF 4.5 3CCV VI-1-12 57 3PGUQPOCF3 II-2-3 8 Total 100

Comparative Example 3

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

(25) TABLE-US-00005 TABLE 4 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3CPUF V-6-2 24 n 0.1 5CPUF V-6-4 6 6.6 2CCUF V-5-1 8 Cp 90 3CCUF V-5-2 10 Vth 1.88 3CCPUF V-10-2 6 12 2CCPUF V-10-1 5 4CCPUF V-10-3 4 3CCGUF V-11-2 4 VCCP1 VI-8-1 2 3CCV VI-1-12 25 3CCV1 VI-1-15 6 Total 100

Example 1

(26) The liquid crystal composition of Example 1 is prepared according to each compound and weight percentage listed in Table 5, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(27) TABLE-US-00006 TABLE 5 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3DPUF I-2 3 n 0.108 4DPUF I-3 5 12.9 5DPUF I-4 3 Cp 101 3PGUQPCF3 II-1-3 5 Vth 1.59 4PGUQPCF3 II-1-4 6 17.2 2PGUQPOCF3 II-2-2 6 VHR (initial) 97.8 3IUQUF IV-9-2 3 3PGUQUF IV-8-2 3 4PGUQUF IV-8-3 5 5PGUQUF IV-8-4 6 3CPUF V-6-2 4 5CPUF V-6-4 6 3CPP2 VI-4-6 2 3CCV VI-1-12 27 3CCV1 VI-1-15 10 5PP1 III-5 6 Total 100

Example 2

(28) The liquid crystal composition of Example 2 is prepared according to each compound and weight percentage listed in Table 6, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(29) TABLE-US-00007 TABLE 6 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 4DPUF I-3 4 n 0.116 5DPUF I-4 4 14.5 3PGUQPCF3 II-1-3 3 Cp 92 4PGUQPCF3 II-1-4 6 Vth 1.39 5PGUQPCF3 II-1-5 5 28 2CCQUF IV-1-1 9 VHR (initial) 97.3 3CCQUF IV-1-2 12 3PUQUF IV-5-2 20 3CPUF V-6-2 11 3CCUF V-5-2 6 2CCPUF V-10-1 3 3CCPUF V-10-2 4 4CCPUF V-10-3 3 3CCV VI-1-12 3 5PP1 III-5 7 Total 100

Example 3

(30) The liquid crystal composition of Example 3 is prepared according to each compound and weight percentage listed in Table 7, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(31) TABLE-US-00008 TABLE 7 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3DPUF I-2 4 n 0.109 5DPUF I-4 5 14.1 2PGUQPCF3 II-1-2 6 Cp 101.3 3PGUQPCF3 II-1-3 6 Vth 1.65 4PGUQPCF3 II-1-4 6 20 2IUQUF IV-9-1 6 VHR (initial) 97.2 3IUQUF IV-9-2 5 2CCUF V-5-1 5 3CCUF V-5-2 6 2CCPUF V-10-1 6 3CCPUF V-10-2 10 4CCPUF V-10-3 6 3CCPOCF3 VI-7-2 8 3CCV VI-1-12 18 5PP1 III-5 3 Total 100

Example 4

(32) The liquid crystal composition of Example 4 is prepared according to each compound and weight percentage listed in Table 8, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(33) TABLE-US-00009 TABLE 8 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3DPUF I-2 3 n 0.097 4DPUF I-3 5 12.1 5DPUF I-4 5 Cp 91 4PGUQPCF3 II-1-4 6 Vth 1.59 2PGUQPOCF3 II-2-2 5 18 3IUQUF IV-9-2 2 VHR (initial) 97.8 3IGUQUF IV-10-2 3 4IGUQUF IV-10-3 5 5IGUQUF IV-10-4 5 3CPUF V-6-2 4 4CPUF V-6-3 4 3CPP2 VI-4-6 2 3CCV VI-1-12 37 3CCV1 VI-1-15 10 5PP1 III-5 4 Total 100

Example 5

(34) The liquid crystal composition of Example 5 is prepared according to each compound and weight percentage listed in Table 9, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(35) TABLE-US-00010 TABLE 9 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 4DPUF I-3 3 n 0.111 5DPUF I-4 3 14.5 4PGUQPCF3 II-1-4 6 Cp 96 2PGUQPOCF3 II-2-2 5 Vth 1.63 2CCQUF IV-1-1 12 21 3CCQUF IV-1-2 12 VHR (initial) 97.3 3PUQUF IV-5-2 14 (C5)PUQUF IV-6-1 6 3CPUF V-6-2 5 3CGUF V-7-2 6 3CCUF V-5-2 7 2CCPUF V-10-1 3 3CCPUF V-10-2 4 4CCPUF V-10-3 3 3CCV VI-1-12 6 5PP1 III-5 5 Total 100

Example 6

(36) The liquid crystal composition of Example 6 is prepared according to each compound and weight percentage listed in Table 10, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(37) TABLE-US-00011 TABLE 10 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3DPUF I-2 3 n 0.108 5DPUF I-4 3 13.1 3PGUQPCF3 II-1-3 5 Cp 105 4PGUQPCF3 II-1-4 6 Vth 1.58 2PGUQPOCF3 II-2-2 6 17.2 3IUQUF IV-9-2 3 VHR (initial) 97.8 3PGUQUF IV-8-2 3 4PGUQUF IV-8-3 5 5PGUQUF IV-8-4 6 3CCGF V-3-2 5 3CPGF V-4-2 5 3CPUF V-6-2 4 5CPUF V-6-4 6 3CPP2 VI-4-6 2 3CCV VI-1-12 25 3CCV1 VI-1-15 10 3PP3 III-8 3 Total 100

Example 7

(38) The liquid crystal composition of Example 7 is prepared according to each compound and weight percentage listed in Table 11, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(39) TABLE-US-00012 TABLE 11 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 3DPUF I-2 4 n 0.115 5DPUF I-4 5 14.3 2PGUQPCF3 II-1-2 6 Cp 101.3 3PGUQPCF3 II-1-3 6 Vth 1.71 4PGUQPCF3 II-1-4 6 21 2IUQUF IV-9-1 6 VHR (initial) 97.4 3IUQUF IV-9-2 5 2CCUF V-5-1 5 3CCUF V-5-2 5 2CCPUF V-10-1 6 3CCPUF V-10-2 10 4CCPUF V-10-3 6 3CCV VI-1-12 12 3CCPOCF3 VI-7-2 8 4PP1 III-4 10 Total 100

Example 8

(40) The liquid crystal composition of Example 8 is prepared according to each compound and weight percentage listed in Table 12, and is tested by filling the same between two substrates of a liquid crystal display device. The test data are shown in the Table below:

(41) TABLE-US-00013 TABLE 12 The formulation of the liquid crystal composition and its test performance Codes of the Codes of the Content Test results for the components structures percentage performance parameters 2DPUF I-1 4 n 0.117 3DPUF I-2 4 14.3 3PGUQPCF3 II-1-3 3 Cp 92 4PGUQPCF3 II-1-4 6 Vth 1.38 5PGUQPCF3 II-1-5 5 29 2CCQUF IV-1-1 9 VHR (initial) 97.8 3CCQUF IV-1-2 12 3PUQUF IV-5-2 20 3CPUF V-6-2 11 3CCUF V-5-2 6 2CCPUF V-10-1 3 3CCPUF V-10-2 4 4CCPUF V-10-3 3 3CCV VI-1-12 3 3PP2 III-2 7 Total 100

(42) Referring to Comparative Examples 1, 2 and 3, it can be seen from the test data of the above Examples 1, 2, 3, 4, 5, 6, 7 and 8 that the liquid crystal composition provided by the present invention has a larger dielectric anisotropy, a larger optical anisotropy, and a lower threshold voltage, and is suitable for liquid crystal display devices. When being compared with Comparative Examples 1, 2 and 3, the liquid crystal composition provided by the present invention has a better optical anisotropy, dielectric anisotropy, and an appropriate clearing point applicable for most liquid crystal display devices, and therefore, can meet the requirements for a high contrast ration and a superior power saving performance for liquid crystal display devices.