LIQUID CRYSTAL COMPOSITION AND DISPLAY DEVICE THEREOF

Abstract

A liquid crystal composition having a negative dielectric anisotropy and a liquid crystal display device comprising the same. The liquid crystal composition comprises: a first component comprising one or more compounds of formula I; a second component comprising two or more than two compounds of formula II; and a third component comprising one or more compounds of formula III.

##STR00001##

Claims

1. A liquid crystal composition having negative dielectric anisotropy, the liquid crystal composition comprising: a first component comprising one or more compounds of formula I ##STR00054## a second component comprising two or more compounds of formula II ##STR00055## and a third component comprising one or more compounds of formula III ##STR00056## in which, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are same or different, and each independently represents C.sub.1-C.sub.12 linear or branched alkyl or alkoxy, C.sub.2-C.sub.12 alkenyl, ##STR00057## are same or different, and each independently represents ##STR00058## one or two CH.sub.2 on the ##STR00059## can be replaced by O in a manner that the oxygen atoms are not directly adjacent, one or more hydrogen atoms on the ##STR00060## can be substituted by fluorine atom; X represents H or halogen; Z represents single bond, CH.sub.2CH.sub.2 or CH.sub.2O; n represents 0 or 1.

2. The liquid crystal composition according to claim 1, wherein the first component comprises one or more compounds selected from a group consisting of the following compounds: ##STR00061## in which, R.sub.1A, R.sub.2A, R.sub.1B and R.sub.2B are same or different, and each independently represents C.sub.1-C.sub.12 linear or branched alkyl or alkoxy, C.sub.2-C.sub.12 alkenyl, ##STR00062##

3. The liquid crystal composition according to claim 1, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are same or different, and each independently represents C.sub.1-C.sub.5 linear or branched alkyl or alkoxy; the R.sub.6 represents C.sub.1-C.sub.5 linear or branched alkyl or alkoxy, or C.sub.2-C.sub.5 alkenyl; the X represents H or F; the Z represents single bond or CH.sub.2O.

4. The liquid crystal composition according to claim 1, wherein the first component comprises 1-30% by weight of the total amount of the liquid crystal composition; the second component comprises 20-80% by weight of the total amount of the liquid crystal composition; and the third component comprises 5-50% by weight of the total amount of the liquid crystal composition.

5. The liquid crystal composition according to claim 1, wherein the compound of formula I-1 is selected from a group consisting of the following compounds: ##STR00063## and the compound of formula I-2 is selected from a group consisting of the following compounds: ##STR00064##

6. The liquid crystal composition according to claim 1, wherein the first component consists of one or more compounds of formula I-1 and one or more compounds of formula I-2, wherein the one or more compounds of formula I-1 comprise 0-15% by weight of the total amount of the liquid crystal composition, the one or more compounds of formula I-2 comprise 0.5-15% by weight of the total amount of the liquid crystal composition, and the content of any one of the one or more compounds of formula I-1 and the one or more compounds of formula I-2 is no more than 10% by weight of the total amount of the liquid crystal composition.

7. The liquid crystal composition according to claim 6, wherein the one or more compounds of formula I-1 comprise 0.5-15% by weight of the total amount of the liquid crystal composition; the one or more compounds of formula I-2 comprise 0.5-15% by weight of the total amount of the liquid crystal composition.

8. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further comprises: a fourth component comprising one or more compounds of formula IV: ##STR00065## in which, R.sub.7 and R.sub.8 are same or different, and each independently represents H, F, C.sub.1-C.sub.5 linear or branched alkyl or alkoxy, or C.sub.2-C.sub.5 alkenyl; m represents 0 or 1, and when m=0, R.sub.8 represents H or F.

9. The liquid crystal composition according to claim 8, wherein the first component comprises 5-20% by weight of the total amount of the liquid crystal composition; the second component comprises 40-70% by weight of the total amount of the liquid crystal composition; the third component comprises 10-35% by weight of the total amount of the liquid crystal composition; and the fourth component comprises 0-10% by weight of the total amount of the liquid crystal composition.

10. The liquid crystal composition according to claim 8, wherein the fourth component comprises one or more compounds selected from a group consisting of the following compounds: ##STR00066## in which, R.sub.7A, R.sub.7B and R.sub.8B are same or different, and each independently represents C.sub.1-C.sub.5 alkyl or alkoxy.

11. The liquid crystal composition according to claim 9, wherein the first component comprises 5-12% by weight of the total amount of the liquid crystal composition; the second component comprises 49-67% by weight of the total amount of the liquid crystal composition; the third component comprises 12-33% by weight of the total amount of the liquid crystal composition; and the fourth component comprises 2-8% by weight of the total amount of the liquid crystal composition.

12. The liquid crystal composition according to claim 10, wherein the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound ##STR00067## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00068## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00069## 8% by weight of the total amount of the liquid crystal composition of compound ##STR00070## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00071## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00072## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00073## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00074## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00075## 22% by weight of the total amount of the liquid crystal composition of compound ##STR00076## 11% by weight of the total amount of the liquid crystal composition of compound ##STR00077## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00078## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00079## and 2% by weight of the total amount of the liquid crystal composition of compound ##STR00080## or the liquid crystal composition comprises: 4% by weight of the total amount of the liquid crystal composition of compound ##STR00081## 8% by weight of the total amount of the liquid crystal composition of compound ##STR00082## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00083## 8% by weight of the total amount of the liquid crystal composition of compound ##STR00084## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00085## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00086## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00087## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00088## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00089## 22% by weight of the total amount of the liquid crystal composition of compound ##STR00090## 11% by weight of the total amount of the liquid crystal composition of compound ##STR00091## 2% by weight of the total amount of the liquid crystal composition of compound ##STR00092## 2% by weight of the total amount of the liquid crystal composition of compound ##STR00093## and 2% by weight of the total amount of the liquid crystal composition of compound ##STR00094## or the liquid crystal composition comprises: 9% by weight of the total amount of the liquid crystal composition of compound ##STR00095## 17% by weight of the total amount of the liquid crystal composition of compound ##STR00096## 17% by weight of the total amount of the liquid crystal composition of compound ##STR00097## 12% by weight of the total amount of the liquid crystal composition of compound ##STR00098## 13% by weight of the total amount of the liquid crystal composition of compound ##STR00099## 12% by weight of the total amount of the liquid crystal composition of compound ##STR00100## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00101## and 10% by weight of the total amount of the liquid crystal composition of compound ##STR00102## or the liquid crystal composition comprises: 6% by weight of the total amount of the liquid crystal composition of compound ##STR00103## 3% by weight of the total amount of the liquid crystal composition of compound ##STR00104## 17% by weight of the total amount of the liquid crystal composition of compound ##STR00105## 17% by weight of the total amount of the liquid crystal composition of compound ##STR00106## 12% by weight of the total amount of the liquid crystal composition of compound ##STR00107## 13% by weight of the total amount of the liquid crystal composition of compound ##STR00108## 12% by weight of the total amount of the liquid crystal composition of compound ##STR00109## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00110## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00111## 3.5% by weight of the total amount of the liquid crystal composition of compound ##STR00112## and 4.5% by weight of the total amount of the liquid crystal composition of compound ##STR00113## or the liquid crystal composition comprises: 7% by weight of the total amount of the liquid crystal composition of compound ##STR00114## 7% by weight of the total amount of the liquid crystal composition of compound ##STR00115## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00116## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00117## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00118## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00119## 9.5% by weight of the total amount of the liquid crystal composition of compound ##STR00120## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00121## 8% by weight of the total amount of the liquid crystal composition of compound ##STR00122## 7.5% by weight of the total amount of the liquid crystal composition of compound ##STR00123## and 19% by weight of the total amount of the liquid crystal composition of compound ##STR00124## or the liquid crystal composition comprises: 5% by weight of the total amount of the liquid crystal composition of compound ##STR00125## 6.5% by weight of the total amount of the liquid crystal composition of compound ##STR00126## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00127## 5.5% by weight of the total amount of the liquid crystal composition of compound ##STR00128## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00129## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00130## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00131## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00132## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00133## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00134## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00135## 7.5% by weight of the total amount of the liquid crystal composition of compound ##STR00136## 3.5% by weight of the total amount of the liquid crystal composition of compound ##STR00137## and 6% by weight of the total amount of the liquid crystal composition of compound ##STR00138## or the liquid crystal composition comprises: 5% by weight of the total amount of the liquid crystal composition of compound ##STR00139## 6.5% by weight of the total amount of the liquid crystal composition of compound ##STR00140## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00141## 5.5% by weight of the total amount of the liquid crystal composition of compound ##STR00142## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00143## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00144## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00145## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00146## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00147## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00148## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00149## 7.5% by weight of the total amount of the liquid crystal composition of compound ##STR00150## and 9.5% by weight of the total amount of the liquid crystal composition of compound ##STR00151## or the liquid crystal composition comprises: 5% by weight of the total amount of the liquid crystal composition of compound ##STR00152## 6.5% by weight of the total amount of the liquid crystal composition of compound ##STR00153## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00154## 5.5% by weight of the total amount of the liquid crystal composition of compound ##STR00155## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00156## 4% by weight of the total amount of the liquid crystal composition of compound ##STR00157## 10% by weight of the total amount of the liquid crystal composition of compound ##STR00158## 9% by weight of the total amount of the liquid crystal composition of compound ##STR00159## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00160## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00161## 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00162## 3% by weight of the total amount of the liquid crystal composition of compound ##STR00163## 9.5% by weight of the total amount of the liquid crystal composition of compound ##STR00164## 1.5% by weight of the total amount of the liquid crystal composition of compound ##STR00165## and 3% by weight of the total amount of the liquid crystal composition of compound ##STR00166## or the liquid crystal composition comprises: 8.5% by weight of the total amount of the liquid crystal composition of compound ##STR00167## 30% by weight of the total amount of the liquid crystal composition of compound ##STR00168## 5% by weight of the total amount of the liquid crystal composition of compound ##STR00169## 5% by weight of the total amount of the liquid crystal composition of compound ##STR00170## 5% by weight of the total amount of the liquid crystal composition of compound ##STR00171## 5% by weight of the total amount of the liquid crystal composition of compound ##STR00172## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00173## 13% by weight of the total amount of the liquid crystal composition of compound ##STR00174## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00175## 6% by weight of the total amount of the liquid crystal composition of compound ##STR00176## 5.5% by weight of the total amount of the liquid crystal composition of compound ##STR00177## and 5% by weight of the total amount of the liquid crystal composition of compound ##STR00178##

13. A liquid crystal composition having a negative dielectric anisotropy which comprises the liquid crystal composition of claim 1, wherein the liquid crystal composition further comprises one or more additives.

14. A liquid crystal display, wherein the liquid crystal display comprises the liquid crystal composition of claim 1.

Description

DETAILED EMBODIMENTS

[0078] 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.

[0079] For the convenience of the expression, the group structures of the liquid crystal compositions in the following Examples are represented by the codes listed in Table 1:

TABLE-US-00001 TABLE 1 Codes of the group structures of the liquid crystal compounds Unit structure of group Code Name of the group [00049] C 1,4-cyclohexylidene [00050] P 1,4-phenylene [00051] G 2-fluoro-1,4-phenylene [00052] W 2,3-difluoro-1,4-phenylene F F fluorine substituent O O oxygen substituent CH.sub.2O 1O methyleneoxy CHCH V alkenyl C.sub.nH.sub.2n+1 or C.sub.mH.sub.2m+1 n or m alkyl

[0080] Take the compound with the following structural formula as an example:

##STR00053##

[0081] Represented by the codes listed in Table 2, this structural formula can be expressed as: 2PWP3, in which, the 2 in the code represents the left terminal is C.sub.2H.sub.5, the 3 in the code represents the right terminal is C.sub.3H.sub.7; the P in the code represents 1,4-phenylene; and the W represents 2,3-difluoro-1,4-phenylene.

[0082] The abbreviated codes of the test items in the following Examples are respectively represented as: [0083] n: optical anisotropy (589 nm, 25 C.) [0084] c: dielectric constant anisotropy (1 KHz, 25 C.) [0085] VHR (initial): voltage holding ratio (%) [0086] VHR (UV): voltage holding ratio after 20 min of UV lamp illumination (%) [0087] VHR (high temperature): voltage holding ratio after holding at high temperature of 150 C. for 1 h (%) [0088] T.sub.C-N ( C.): low-temperature phase transformation point (the transformation temperature from other more ordered phases to a nematic phase) [0089] T.sub.N-I ( C.): clearing point (the transformation temperature of the liquid crystal from a nematic phase to an isotropy phase) [0090] 1: rotational viscosity (mPa*s, at 20 C.)

[0091] 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 is the TN90 type with a cell gap of 7 m.

[0092] =, in which, | 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.

[0093] 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.

[0094] VHR (UV) is tested and obtained by the TOY06254 type liquid crystal physical property evaluation system; the liquid crystal is tested after being irradiated with light having a wavelength of 365 nm and an energy of 6000 mJ/cm.sup.2 for 20 mins, the test temperature is 60 C., the test voltage is 5 V, and the test frequency is 6 Hz.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

Comparative Example 1

[0099] The liquid crystal composition of Comparative 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. The test data is shown in the Table below:

TABLE-US-00002 TABLE 2 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 5PP1 8 n: 0.102 3CWO2 II -1-3 7 : 2.9 3CWO4 II -1-5 8 VHR (initial): 91.4 2CPWO2 II -4-2 6 VHR (UV): 84.5 3CPWO2 II -4-5 7 VHR (high 91.3 temperature): 3CCWO3 II -3-6 7 T.sub.CN ( C.): 32 4CCWO2 II -3-7 7 T.sub.NI ( C.): 75 5CCWO2 II -3-9 7 1: 111 3CC2 III-2 22 3CC4 III-5 11 3PWP2 V -1 4 4PWP2 V -1 4 3CCP1 V -2 2 Total 100

Example 1

[0100] The liquid crystal composition of Example 1 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. The test data is shown in the Table below:

TABLE-US-00003 TABLE 3 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3PPO2 I -1-2 4 n: 0.108 3GPO2 I -2-2 4 : 3.1 3CWO2 II -1-3 7 VHR (initial): 92.6 3CWO4 II -1-5 8 VHR (UV): 86.9 2CPWO2 II -4-2 6 VHR (high 92.5 temperature): 3CPWO2 II -4-5 7 T.sub.CN ( C.): 37 3CCWO3 II -3-6 7 T.sub.NI ( C.): 77 4CCWO2 II -3-7 7 1: 111 5CCWO2 II -3-9 7 3CC2 III-2 22 3CC4 III-5 11 3PWP2 V -1 4 4PWP2 V -1 4 3CCP1 V -2 2 Total 100

Example 2

[0101] The liquid crystal composition of Example 2 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. The test data is shown in the Table below:

TABLE-US-00004 TABLE 4 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3PPO2 I -1-2 4 n: 0.106 3GPO2 I -2-2 8 : 2.9 3CWO2 II -1-3 7 VHR (initial): 94.2 3CWO4 II -1-5 8 VHR (UV): 91.1 2CPWO2 II -4-2 6 VHR (high 93.9 temperature): 3CPWO2 II -4-5 7 T.sub.CN ( C.): 37 3CCWO3 II -3-6 7 T.sub.NI ( C.): 77 4CCWO2 II -3-7 7 1: 101 5CCWO2 II -3-9 7 3CC2 III-2 22 3CC4 III-5 11 3PWP2 V -1 2 4PWP2 V -1 2 3CCP1 V -2 2 Total 100

Comparative Example 2

[0102] The liquid crystal composition of Comparative Example 2 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. The test data is shown in the Table below:

TABLE-US-00005 TABLE 5 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 4PP1 7 n: 0.151 3PWO2 II -2-2 19 : 3.6 5PWO2 II -2-6 17 VHR (initial): 89.5 2CPWO2 II -4-2 12 VHR (UV): 81.3 3CPWO2 II -4-5 13 VHR (high 89.3 temperature): 3CCV1 III-8 12 T.sub.CN ( C.): 31 VCCP1 V -2 10 T.sub.NI ( C.): 72 3CPP2 V -3 10 1: 143 Total 100

Example 3

[0103] The liquid crystal composition of Example 3 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. The test data is shown in the Table below:

TABLE-US-00006 TABLE 6 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3GPO2 I -2-2 9 n: 0.157 3PWO2 II -2-2 17 : 3.5 5PWO2 II -2-6 17 VHR (initial): 91.1 2CPWO2 II -4-2 12 VHR (UV): 82.4 3CPWO2 II -4-5 13 VHR (high 90.6 temperature): 3CCV1 III-8 12 T.sub.CN ( C.): 38 VCCP1 V -2 10 T.sub.NI ( C.): 77 3CPP2 V -3 10 1: 138 Total 100

Example 4

[0104] The liquid crystal composition of Example 4 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. The test data is shown in the Table below:

TABLE-US-00007 TABLE 7 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3GPO2 I -2-2 6 n: 0.167 3PPO2 I -1-2 3 : 3.4 3PWO2 II -2-2 17 VHR (initial): 91.3 5PWO2 II -2-6 17 VHR (UV): 82.6 2CPWO2 II -4-2 12 VHR (high 91.1 temperature): 3CPWO2 II -4-5 13 T.sub.CN ( C.): 37 3CCV1 III-8 12 T.sub.NI ( C.): 80 VCCP1 V -2 6 1: 145 3CPP2 V -3 6 3PGPF IV-1-3 3.5 3PGPC2 IV-2-2 4.5 Total 100

Comparative Example 3

[0105] The liquid crystal composition of Comparative Example 3 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. The test data is shown in the Table below:

TABLE-US-00008 TABLE 8 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3PP1 7 n: 0.110 4PP1 7 : 3.7 3CCWO1 II -3-4 5 VHR (initial): 91.2 3CCWO2 II -3-5 7 VHR (UV): 82.5 3CCWO3 II -3-6 12 VHR (high 90.8 temperature): 4CCWO2 II -3-7 8 T.sub.CN ( C.): 27 2CPWO2 II -4-2 9.5 T.sub.NI ( C.): 80 3CPWO2 II -4-5 10 1: 117 3CWO2 II -1-3 12 3CWO4 II -1-5 3.5 3CCV III-7 19 Total 100

Example 5

[0106] The liquid crystal composition of Example 5 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. The test data is shown in the Table below:

TABLE-US-00009 TABLE 9 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3PPO4 I -1-4 7 n: 0.117 3GPO2 I -2-2 7 : 3.6 3CCWO1 II -3-4 6 VHR (initial): 92.8 3CCWO2 II -3-5 6 VHR (UV): 85.1 3CCWO3 II -3-6 10 VHR (high 92.1 temperature): 4CCWO2 II -3-7 10 T.sub.CN ( C.): 37 2CPWO2 II -4-2 9.5 T.sub.NI ( C.): 85 3CPWO2 II -4-5 10 1: 119 3CWO2 II -1-3 8 3CWO4 II -1-5 7.5 3CCV III-7 19 Total 100

Comparative Example 4

[0107] The liquid crystal composition of Comparative Example 4 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. The test data is shown in the Table below:

TABLE-US-00010 TABLE 10 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 2CPWO2 II -4-2 5 n: 0.110 3CPWO2 II -4-5 6.5 : 4.7 3C1OWO2 II -5-2 9 VHR (initial): 88.9 3CPWO3 II -4-6 5.5 VHR (UV): 84.3 2CC1OWO2 II -6-2 8.5 VHR (high 88.6 temperature): 3CC1OWO2 II -6-5 4 T.sub.CN ( C.): 32 3CCWO2 II -3-5 10 T.sub.NI ( C.): 91 4CCWO2 II -3-7 9 1: 108 4C1OWO2 II -5-3 8.5 3CC2 III-2 8.5 4CC3 III-5 8.5 3CCP1 V -2 7.5 5PP1 9.5 Total 100

Example 6

[0108] The liquid crystal composition of Example 6 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. The test data is shown in the Table below:

TABLE-US-00011 TABLE 11 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 2CPWO2 II -4-2 5 n: 0.117 3CPWO2 II -4-5 6.5 : 4.8 3C1OWO2 II -5-2 9 VHR (initial): 90.1 3CPWO3 II -4-6 5.5 VHR (UV): 86.3 2CC1OWO2 II -6-2 8.5 VHR (high 89.7 temperature): 3CC1OWO2 II -6-5 4 T.sub.CN ( C.): 39 3CCWO2 II -3-5 10 T.sub.NI ( C.): 93 4CCWO2 II -3-7 9 1: 109 4C1OWO2 II -5-3 8.5 3CC2 III-2 8.5 4CC3 III-5 8.5 3CCP1 V -2 7.5 3PPO2 I -1-2 3.5 3GPO2 I -2-2 6 Total 100

Example 7

[0109] The liquid crystal composition of Example 7 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. The test data is shown in the Table below:

TABLE-US-00012 TABLE 12 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 2CPWO2 II -4-2 5 n: 0.117 3CPWO2 II -4-5 6.5 : 4.8 3C1OWO2 II -5-2 9 VHR (initial): 90.2 3CPWO3 II -4-6 5.5 VHR (UV): 86.2 2CC1OWO2 II -6-2 8.5 VHR (high 90.1 temperature): 3CC1OWO2 II -6-5 4 T.sub.CN ( C.): 44 3CCWO2 II -3-5 10 T.sub.NI ( C.): 93 4CCWO2 II -3-7 9 1: 109 4C1OWO2 II -5-3 8.5 3CC2 III-2 8.5 4CC3 III-5 8.5 3CCP1 V -2 7.5 3GPO2 I -2-2 9.5 Total 100

Example 8

[0110] The liquid crystal composition of Example 8 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. The test data is shown in the Table below:

TABLE-US-00013 TABLE 13 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 2CPWO2 II -4-2 5 n: 0.120 3CPWO2 II -4-5 6.5 : 4.7 3C1OWO2 II -5-2 9 VHR (initial): 91.2 3CPWO3 II -4-6 5.5 VHR (UV): 88.9 2CC1OWO2 II -6-2 8.5 VHR (high 90.5 temperature): 3CC1OWO2 II -6-5 4 T.sub.CN ( C.): 39 3CCWO2 II -3-5 10 T.sub.NI ( C.): 98 4CCWO2 II -3-7 9 1: 111 4C1OWO2 II -5-3 8.5 3CC2 III-2 8.5 4CC3 III-5 8.5 3CCP1 V -2 3 3GPO2 I -2-2 9.5 3PGPF IV-1-3 1.5 3PGPC2 IV-2-2 3 Total 100

Comparative Example 5

[0111] The liquid crystal composition of Comparative Example 5 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. The test data is shown in the Table below:

TABLE-US-00014 TABLE 14 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3CPWO2 II -4-5 8.5 n: 0.110 3CWO4 II -1-5 30 : 3.5 3CCWO2 II -3-5 5 VHR (initial): 90.9 5CCWO2 II -3-9 5 VHR (UV): 85.5 4CCWO2 II -3-7 5 VHR (high 90.6 temperature): 3CCWO3 II -3-6 5 T.sub.CN ( C.): 37 3CCW1 II -3-1 6 T.sub.NI ( C.): 88 2PWP3 V -1 6 1: 127 2PWP4 V -1 4.5 VCCP1 V -2 13 4CCV III-9 6 3CCV1 III-8 6 Total 100

Example 9

[0112] The liquid crystal composition of Example 9 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. The test data is shown in the Table below:

TABLE-US-00015 TABLE 15 Formulation of the liquid crystal composition and the test performances thereof Monomer Compound Weight Test results for the Name No. Percentage performance parameters 3CPWO2 II -4-5 8.5 n: 0.114 3CWO4 II -1-5 30 : 3.3 3CCWO2 II -3-5 5 VHR (initial): 94.5 5CCWO2 II -3-9 5 VHR (UV): 92.2 4CCWO2 II -3-7 5 VHR (high 94.2 temperature): 3CCWO3 II -3-6 5 T.sub.CN ( C.): 42 3CCW1 II -3-1 6 T.sub.NI ( C.): 90 VCCP1 V -2 13 1: 119 4CCV III-9 6 3CCV1 III-8 6 3GPO2 I -2-2 5.5 3PGPC2 IV-2-2 5 Total 100

[0113] As can be known from the data of the Comparative Examples and Examples above, the liquid crystal composition provided by the present invention has higher optical anisotropy value, lower low-temperature phase transformation point and higher clearing point, indicating that the liquid crystal composition provided by the present invention has the characteristic of wide temperature range of the nematic phase. Meanwhile, the liquid crystal composition of the present invention also has higher voltage holding ratio, better high-temperature and ultraviolet stability, and the liquid crystal display comprising the liquid crystal composition of the present invention can meet the demand for rapid response speed and has higher stability. The liquid crystal composition of the present invention avoids the impacts of exposure and/or high temperature on the liquid crystal composition, and can meet the demand for the liquid crystal display being in normal operation in a harsh environment.

[0114] The above embodiments are merely illustrative of the technical concepts and features of the present invention, and provided for facilitating the understanding and practice of the present invention by those skilled in the art. However, the protection scope of the invention is not limited thereto. Equivalent variations or modifications made without departing from the spirit and essence of the present invention are intended to be contemplated within the protection scope of the present invention.