LIQUID CRYSTAL COMPOSITION HAVING GOOD PHOTOSTABILITY AND THERMOSTABILITY, AND LIQUID CRYSTAL DISPLAY ELEMENT

Abstract

A liquid crystal composition having good photostability and thermostability. The liquid crystal composition comprises: 5-30% of one or more compounds of general formula I based on the total weight of the liquid crystal composition; 1-30% of one or more compounds of general formula II based on the total weight of the liquid crystal composition; 1-30% of one or more compounds of general formula III based on the total weight of the liquid crystal composition; 1-20% of one or more compounds of general formula IV-1 and/or general formula IV-2 based on the total weight of the liquid crystal composition; and 15-50% of one or more compounds of general formula V based on the total weight of the liquid crystal composition. A liquid crystal display element containing the liquid crystal composition is also provided.

##STR00001##

Claims

1. A liquid crystal composition, comprising: 5-30% of one or more compounds of general formula I based on a total weight of the liquid crystal composition ##STR00031## 1-30% of one or more compounds of general foimula II based on the total weight of the liquid crystal composition ##STR00032## 1-30% of one or more compounds of general foimula III based on the total weight of the liquid crystal composition ##STR00033## 1-20% of one or more compounds of general formula IV-1 and/or IV-2 based on the total weight of the liquid crystal composition ##STR00034## and 15-50% of one or more compounds of general formula V based on the total weight of the liquid crystal composition ##STR00035## and the liquid crystal composition does not comprises a compound of general formula VIII: ##STR00036## wherein, R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 are the same or different and are each independently selected from a halogenated or non-halogenated alkyl or alkoxy group having 1 to 10 carbon atoms or a halogenated or non-halogenated alkenyl or alkenyloxy group having 2 to 10 carbon atoms; L.sub.1 is H, F, Cl, or CH.sub.3; Z.sub.1 is a single bond, COO, or OCO; X.sub.1 is H or CH.sub.3.

2. The liquid crystal composition according to claim 1, further comprising: one or more compounds of general formula VI, wherein an amount of the one or more compounds of general formula VI based on the total weight of the liquid crystal composition is greater than 0% and less than or equal to 10%, ##STR00037## wherein, R.sub.9 is selected from an alkyl or alkoxy group having 1 to 10 carbon atoms or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms; X.sub.2 is selected from F, OCF.sub.3, an alkyl or alkoxy group having 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms; ring ##STR00038## is ##STR00039##

3. The liquid crystal composition according to claim 2, further comprising: one or more compounds of general formula VII, wherein an amount of the one or more compounds of general formula VII based on the total weight of the liquid crystal composition is greater than 0% and less than or equal to 30%, ##STR00040## wherein, R.sub.10 is selected from an alkyl or alkoxy group having 1 to 10 carbon atoms or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms; ring ##STR00041## and ring ##STR00042## are the same or different and are each independently selected from ##STR00043##

4. The liquid crystal composition according to claim 1, wherein the compound of general formula I is selected from compounds I-1 to I-5: ##STR00044##

5. The liquid crystal composition according to claim 1, wherein the compound of general formula II is selected from compounds II-1 to II-5: ##STR00045##

6. The liquid crystal composition according to claim 1, wherein the compound of general formula III is selected from compounds III-1 to III-5: ##STR00046##

7. The liquid crystal composition according to claim 1, wherein the compound of general formula N-1 is selected from compounds IV-1-1 to IV-1-10: ##STR00047## the compound of general formula IV-2 is selected from compounds IV-2-1 to IV-2-10: ##STR00048##

8. The liquid crystal composition according to claim 1, wherein the compound of general formula V is selected from compounds V-1 to V-6: ##STR00049##

9. The liquid crystal composition according to claim 2, wherein the compound of general formula VI is selected from compounds VI-1 to VI-10: ##STR00050##

10. The liquid crystal composition according to claim 3, wherein the compound of general formula VII is selected from compounds of general formulas VII-1 to VII-2: ##STR00051## wherein, R.sub.10 is selected from an alkyl or alkoxy group having 1 to 5 carbon atoms or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms.

11. The liquid crystal composition according to claim 10, wherein the compound of general formula VII-1 is selected from compounds VII-1-1 to VII-1-5: ##STR00052## the compound of general formula VII-2 is selected from compounds VII-2-1 to VII-2-5: ##STR00053##

12. The liquid crystal composition according to claim 1, wherein the liquid crystal composition comprises: 8% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00054## 7% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00055## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00056## 1% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00057## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00058## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00059## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00060## 6.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00061## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00062## 7% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00063## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00064## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00065## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00066## 9% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00067## and 23% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00068## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00069## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00070## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00071## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00072## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00073## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00074## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00075## 6% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00076## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00077## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00078## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00079## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00080## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00081## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00082## 5% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00083## 16% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00084## and 5% of the compound VI-7 based on the total weight of the liquid crystal composition ##STR00085## or the liquid crystal composition comprises: 4% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00086## 4% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00087## 3% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00088## 2% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00089## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00090## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00091## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00092## 4% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00093## 3% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00094## 4% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00095## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00096## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00097## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00098## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00099## 19.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00100## 4% of the compound VII-2-3 based on the total weight of the liquid crystal composition ##STR00101## 5% of the compound VII-2-4 based on the total weight of the liquid crystal composition ##STR00102## 9% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00103## and 9% of the compound VII-1-5 based on the total weight of the liquid crystal composition ##STR00104## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00105## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00106## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00107## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00108## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00109## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00110## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00111## 6% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00112## 5.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00113## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00114## 5.5% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00115## 3.5% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00116## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00117## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00118## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00119## 1.5% of the compound IV-2-5 based on the total weight of the liquid crystal composition ##STR00120## 5% of the compound V-2 based on the total weight of the liquid crystal composition ##STR00121## 5% of the compound V-3 based on the total weight of the liquid crystal composition ##STR00122## and 10% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00123## or the liquid crystal composition comprises: 6% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00124## 6% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00125## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00126## 4% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00127## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00128## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00129## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00130## 4% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00131## 5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00132## 6% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00133## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00134## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00135## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00136## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00137## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00138## 25.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00139## and 3% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00140##

13. (canceled)

14. A liquid crystal display element, comprising the liquid crystal composition of claim 1.

15. The liquid crystal composition according to claim 2, wherein the liquid crystal composition comprises: 8% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00141## 7% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00142## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00143## 1% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00144## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00145## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00146## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00147## 6.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00148## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00149## 7% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00150## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00151## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00152## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00153## 9% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00154## and 23% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00155## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00156## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00157## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00158## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00159## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00160## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00161## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00162## 6% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00163## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00164## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00165## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00166## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00167## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00168## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00169## 5% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00170## 16% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00171## and 5% of the compound VI-7 based on the total weight of the liquid crystal composition ##STR00172## or the liquid crystal composition comprises: 4% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00173## 4% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00174## 3% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00175## 2% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00176## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00177## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00178## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00179## 4% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00180## 3% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00181## 4% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00182## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00183## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00184## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00185## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00186## 19.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00187## 4% of the compound VII-2-3 based on the total weight of the liquid crystal composition ##STR00188## 5% of the compound VII-2-4 based on the total weight of the liquid crystal composition ##STR00189## 9% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00190## and 9% of the compound VII-1-5 based on the total weight of the liquid crystal composition ##STR00191## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00192## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00193## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00194## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00195## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00196## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00197## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00198## 6% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00199## 5.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00200## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00201## 5.5% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00202## 3.5% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00203## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00204## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00205## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00206## 1.5% of the compound IV-2-5 based on the total weight of the liquid crystal composition ##STR00207## 5% of the compound V-2 based on the total weight of the liquid crystal composition ##STR00208## 5% of the compound V-3 based on the total weight of the liquid crystal composition ##STR00209## and 10% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00210## or the liquid crystal composition comprises: 6% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00211## 6% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00212## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00213## 4% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00214## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00215## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00216## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00217## 4% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00218## 5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00219## 6% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00220## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00221## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00222## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00223## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00224## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00225## 25.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00226## and 3% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00227##

16. The liquid crystal composition according to claim 3, wherein the liquid crystal composition comprises: 8% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00228## 7% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00229## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00230## 1% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00231## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00232## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00233## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00234## 6.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00235## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00236## 7% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00237## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00238## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00239## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00240## 9% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00241## and 23% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00242## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00243## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00244## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00245## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00246## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00247## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00248## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00249## 6% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00250## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00251## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00252## 4% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00253## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00254## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00255## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00256## 5% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00257## 16% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00258## and 5% of the compound VI-7 based on the total weight of the liquid crystal composition ##STR00259## or the liquid crystal composition comprises: 4% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00260## 4% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00261## 3% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00262## 2% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00263## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00264## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00265## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00266## 4% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00267## 3% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00268## 4% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00269## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00270## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00271## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00272## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00273## 19.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00274## 4% of the compound VII-2-3 based on the total weight of the liquid crystal composition ##STR00275## 5% of the compound VII-2-4 based on the total weight of the liquid crystal composition ##STR00276## 9% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00277## and 9% of the compound VII-1-5 based on the total weight of the liquid crystal composition ##STR00278## or the liquid crystal composition comprises: 9% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00279## 8% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00280## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00281## 3% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00282## 6% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00283## 9% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00284## 4% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00285## 6% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00286## 5.5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00287## 7% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00288## 5.5% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00289## 3.5% of the compound I-2 based on the total weight of the liquid crystal composition ##STR00290## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00291## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00292## 3.5% of the compound IV-2-3 based on the total weight of the liquid crystal composition ##STR00293## 1.5% of the compound IV-2-5 based on the total weight of the liquid crystal composition ##STR00294## 5% of the compound V-2 based on the total weight of the liquid crystal composition ##STR00295## 5% of the compound V-3 based on the total weight of the liquid crystal composition ##STR00296## and 10% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00297## or the liquid crystal composition comprises: 6% of the compound II-3 based on the total weight of the liquid crystal composition ##STR00298## 6% of the compound II-4 based on the total weight of the liquid crystal composition ##STR00299## 5% of the compound II-5 based on the total weight of the liquid crystal composition ##STR00300## 4% of the compound II-2 based on the total weight of the liquid crystal composition ##STR00301## 5% of the compound III-2 based on the total weight of the liquid crystal composition ##STR00302## 3% of the compound III-3 based on the total weight of the liquid crystal composition ##STR00303## 5% of the compound III-4 based on the total weight of the liquid crystal composition ##STR00304## 4% of the compound III-5 based on the total weight of the liquid crystal composition ##STR00305## 5% of the compound I-3 based on the total weight of the liquid crystal composition ##STR00306## 6% of the compound I-4 based on the total weight of the liquid crystal composition ##STR00307## 6% of the compound I-5 based on the total weight of the liquid crystal composition ##STR00308## 1.5% of the compound IV-1-3 based on the total weight of the liquid crystal composition ##STR00309## 2% of the compound IV-1-8 based on the total weight of the liquid crystal composition ##STR00310## 2% of the compound IV-1-5 based on the total weight of the liquid crystal composition ##STR00311## 11% of the compound V-4 based on the total weight of the liquid crystal composition ##STR00312## 25.5% of the compound V-1 based on the total weight of the liquid crystal composition ##STR00313## and 3% of the compound VII-1-3 based on the total weight of the liquid crystal composition ##STR00314##

17. A liquid crystal display element, comprising the liquid crystal composition of claim 2.

18. A liquid crystal display element, comprising the liquid crystal composition of claim 3.

19. A liquid crystal display element, comprising the liquid crystal composition of claim 12.

20. (canceled)

Description

DETAILED DESCRIPTION OF THE INVENTION

[0060] The present invention will be described below in connection with specific embodiments. It is noted that the following examples are merely illustrative of the invention and are not intended to be limiting. Other combinations and various modifications can be made based on the concept of the invention without departing from the spirit or scope of the invention.

[0061] For convenience of expression, in the following examples, the group structures of the liquid crystal composition are represented by codes listed in Table 1:

TABLE-US-00001 TABLE 1 Codes for group structures in liquid crystal compounds Unit structure of the group Code Name of the group [00026] C 1,4-cyclohexylene [00027] P 1,4-phenylene [00028] D 1,4-dioxanyl [00029] U 2,5-difluoro-1,4-phenylene CN N Cyano CH.sub.2CH.sub.2 2 Ethylene OCF.sub.3 OCF.sub.3 Trifluoromethoxy F F Fluoro substituent O O Oxy substituent CF.sub.2O Q Difluoromethyloxy COO E Ester linkage CH.sub.2O 10 Methyleneoxy C.sub.nH.sub.2n+1 or C.sub.mH.sub.2m+1 n or m Alkyl CHCH or CHCH.sub.2 V Vinyl CC or CCH T Ethynyl

[0062] A compound of the following formula is taken as an example:

##STR00030##

[0063] With the codes listed in Table 1, the structural formula may be expressed as nCCGF, in which n represents the number of C atoms of the alkyl at the left end and is, for example, 3, indicating that the alkyl is C.sub.3H.sub.7; and C represents cyclohexyl.

[0064] The test items in the following examples are abbreviated as follows:

[0065] Cp: clearing point (nematic-isotropic phase transition temperature, C.)

[0066] : dielectric anisotropy (1 KHz, 25 C.)

[0067] n: optical anisotropy (589 nm, 20 C.)

[0068] VHR (100 C.): voltage holding ratio after being maintained at a high temperature of 100 C. for 1 h (%)

[0069] VHR (UV): voltage holding ratio after 20 min of irradiation by a UV lamp (%)

[0070] : kinetic viscosity (mm.sup.2.Math.s.sup.1, 25 C., unless otherwise noted)

[0071] The optical anisotropy is measured using an Abbe refractometer under a sodium lamp (589 nm) as a light source at 20 C. The dielectric test cell is the type TN90, and the cell gap is 7 m.

[0072] VHR (UV) is tested by TOY06254 liquid crystal physical property evaluation system, where the test cell is irradiated by a UV lamp for 20 min (365 nm, 5 mW/cm.sup.2) and cooled to room temperature, the test temperature is 25 C., and the test cycle is 166.7 ms.

[0073] VHR (100 C.) is tested using TOY06254 liquid crystal physical property evaluation system, where the test temperature is 100 C., and the test cycle is 166.7 ms.

[0074] Each of the components used in the following examples can be synthesized using a known method or using an appropriate combination of methods in organic synthesis chemistry, by the inventors of this application. These synthesis techniques are conventional and the resulting liquid crystal compounds are tested to conform to the standards for electronic compounds. Methods for introducing a target terminal group, a ring structure and a binding group into a starting material are described in Organic Syntheses, John Wiley & Sons, Inc; Organic Reactions, John Wiley & Sons, Inc; Comprehensive Organic Synthesis, Pergamon Press; New Experimental Chemistry Course (MARUZEN CO., LTD), and other publications.

[0075] A liquid crystal composition is prepared according to a mixing ratio of the liquid crystal compositions defined in the following examples. The liquid crystal composition is prepared by a conventional method in the art, for example, mixing according to the defined ratio by heating, ultrasonicating, and suspending, etc.

[0076] The liquid crystal compositions given in the following examples are prepared and investigated. Composition and performance test results of each liquid crystal composition are shown below.

[0077] Each of the liquid crystal displays used in the following embodiments is a TFT liquid crystal display device, having a cell gap of d=7 m and including polarizers and electrode substrates. The display device is in a normally white mode, that is, the color of a pixel seen by a viewer is white when no voltage is applied across row electrodes and column electrodes. Upper polarizer axis and lower polarizer axis on the substrates are at a 90-degree angle with respect to each other. An optical liquid crystal material is filled into a space between the two substrates.

[0078] The composition, mixing ratio and test result of the liquid crystal compositions of comparative examples when filled in two substrate of the liquid crystal display device for peformance test are listed in Tables 2 and 7, for comparison in performance with the liquid crystal compositions of the present invention.

COMPARATIVE EXAMPLE 1

[0079] The liquid crystal composition of Comparative Example 1 was prepared with the compounds in percentages by weight shown in Table 2, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00002 TABLE 2 Formulation of liquid crystal composition and performances tested Code of Code of Percentage Test result of component structure by weight performance parameters 3PUQUF 6 Cp 90.2 2CPUQUF 9 10.2 3CPUQUF 9 n 0.103 3C2CUF 12 32.8 4C2CUF 9 VHR (100 C.) 95.2% 5C2CUF 9 VHR (UV) 90.7% 3CCUF 7 4CCUF 5 3CC2UF 15 3CPUF 6 5CPUF 4 3CGUF 4 2CCCUF 2 3CCCUF 3 Total 100

EXAMPLE 1

[0080] The liquid crystal composition of Example 1 was prepared with the compounds in percentages by weight shown in Table 3, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00003 TABLE 3 Formulation of liquid crystal composition and performances tested Code of Code of Percentage Test result of component structure by weight performance parameters 3CCGF II-3 8 Cp 95.9 4CCGF II-4 7 10.1 5CCGF II-5 5 n 0.105 2CCGF II-2 1 18 2CCPOCF3 III-2 6 VHR (100 C.) 96.5% 3CCPOCF3 III-3 9 VHR (UV) 96.1% 4CCPOCF3 III-4 4 3PGUQUF I-3 6.5 4PGUQUF I-4 7 5PGUQUF I-5 7 2PGUQUF I-2 4 3CPPC3 IV-1-3 1.5 3CGPC3 IV-1-8 2 3CCV1 V-4 9 3CCV V-1 23 Total 100

EXAMPLE 2

[0081] The liquid crystal composition of Example 2 was prepared with the compounds in percentages by weight shown in Table 4, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00004 TABLE 4 Formulation of liquid crystal composition and performances tested Test result Code of Code of Percentage of performance component structure by weight parameters 3CCGF II-3 9 Cp 100.1 4CCGF II-4 8 10.8 5CCGF II-5 5 n 0.107 2CCGF II-2 3 19 2CCPOCF3 III-2 6 VHR (100 C.) 96.2% 3CCPOCF3 III-3 9 VHR (UV) 96.0% 4CCPOCF3 III-4 4 3PGUQUF I-3 6 4PGUQUF I-4 7 5PGUQUF I-5 6 2PGUQUF I-2 4 3CPPC3 IV-1-3 1.5 3CPPC5 IV-1-5 2 3CCEPC3 IV-2-3 3.5 3CCV1 V-4 5 3CCV V-1 16 7CPF VI-7 5 Total 100

EXAMPLE 3

[0082] The liquid crystal composition of Example 3 was prepared with the compounds in percentages by weight shown in Table 5, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00005 TABLE 5 Formulation of liquid crystal composition and performances tested Code of Code of Percentage Test result of component structure by weight performance parameters 3CCGF II-3 4 Cp 95.9 4CCGF II-4 4 10.7 5CCGF II-5 3 n 0.1 2CCGF II-2 2 22 2CCPOCF3 III-2 5 VHR (100 C.) 96.2% 3CCPOCF3 III-3 3 VHR (UV) 96.8% 4CCPOCF3 III-4 5 3PGUQUF I-3 4 4PGUQUF I-4 3 5PGUQUF I-5 4 3CPPC3 IV-1-3 1.5 3CGPC3 IV-1-8 2 3CPPC5 IV-1-5 2 3CCV1 V-4 11 3CCV V-1 19.5 3DPUF VII-2-3 4 4DPUF VII-2-4 5 3CDUF VII-1-3 9 5CDUF VII-1-5 9 Total 100

EXAMPLE 4

[0083] The liquid crystal composition of Example 4 was prepared with the compounds in percentages by weight shown in Table 6, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00006 TABLE 6 Formulation of liquid crystal composition and performances tested Code of Code of Percentage Test result of component structure by weight performance parameters 3CCGF II-3 9 Cp 109.4 4CCGF II-4 8 10.5 5CCGF II-5 5 n 0.107 2CCGF II-2 3 22 2CCPOCF3 III-2 6 VHR (100 C.) 96.3% 3CCPOCF3 III-3 9 VHR (UV) 96.0% 4CCPOCF3 III-4 4 5CCPOCF3 III-5 6 3PGUQUF I-3 5.5 4PGUQUF I-4 7 5PGUQUF I-5 5.5 2PGUQUF I-2 3.5 3CPPC3 IV-1-3 1.5 3CPPC5 IV-1-5 2 3CCEPC3 IV-2-3 3.5 3CCEPC5 IV-2-5 1.5 4CCV V-2 5 5CCV V-3 5 3CCV V-1 10 Total 100

EXAMPLE 5

[0084] The liquid crystal composition of Example 5 was prepared with the compounds in percentages by weight shown in Table 7, filled between two substrates of a liquid crystal display, and subjected to performance test. The test data is shown in the table below.

TABLE-US-00007 TABLE 7 Formulation of liquid crystal composition and performances tested Code of Code of Percentage Test result of component structure by weight performance parameters 3CCGF II-3 6 Cp 100.2 4CCGF II-4 6 10.1 5CCGF II-5 5 n 0.101 2CCGF II-2 4 20 2CCPOCF3 III-2 5 VHR (100 C.) 96.2% 3CCPOCF3 III-3 3 VHR (UV) 96.5% 4CCPOCF3 III-4 5 5CCPOCF3 III-5 4 3PGUQUF I-3 5 4PGUQUF I-4 6 5PGUQUF I-5 6 3CPPC3 IV-1-3 1.5 3CGPC3 IV-1-8 2 3CPPC5 IV-1-5 2 3CCV1 V-4 11 3CCV V-1 25.5 3CDUF VII-1-3 3 Total 100

COMPARATIVE EXAMPLE 2

[0085] The liquid crystal composition of Example 1, prepared with the compounds in percentages by weight shown in Table 3, was mixed with the compound 3PUQUF in a ratio of 95:5, 90:10 and 85:15 to give the liquid crystal compositions M1, M2 and M3 respectively. The liquid crystal compositions M1, M2 and M3 were filled into two substrate of the liquid crystal display device for performance test. The test data is shown in Table 7 below:

TABLE-US-00008 TABLE 7 M1 M2 M3 VHR (100 C.) 96.5% 96.5% 96.5% VHR (UV) 93.3% 91.4% 81.8%

[0086] It can be seen from the data in Table 7 that the VHR value of the liquid crystal composition after UV irradiation decreases with increase in 3PUQUF content, indicating that 3PUQUF can decrease the UV stability of the liquid crystal composition.

[0087] It can be known from the performance parameters of the liquid crystal compositions shown in Comparative Example 1, Comparative Example 2 and Examples 1-5 that, the liquid crystal compositions of the present invention have a higher dielectric anisotropy, a suitable optical anisotropy, a lower viscosity, good photostability and thermostability, and a higher clearing point, and are particularly suitable for use in liquid crystal display elements such as TFT driven by AM driving.

[0088] The above merely describes preferred embodiments of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to the preferred embodiments, the present invention is not limited thereto. Without departing from the scope of the technical solutions of the present invention, any person skilled in the art can make variations or modifications to form equivalent embodiments according to the technical content disclosed above. Any simple variations, equivalent changes and modifications made to the foregoing embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of the technical solutions of the present invention.