Compound, liquid crystal medium containing the compound and application thereof

A liquid crystal medium containing one or more of the compounds having a following formula I:

• wherein:
• R represents one of a cyclopropyl group, a cyclopentyl group, and a 2-tetrahydrofuryl group;
• Z represents one of a single bond, —O—, —CH2CH2—, —CH2O—, —CF2O—, and —COO—;
• and
• X represents one of H, F, an alkyl group having 1-7 carbon atoms, and an alkoxygroup having 1-7 carbon atoms, wherein in the alkyl group having 1-7 carbon atoms and the alkoxygroup having 1-7 carbon atoms, one or more H atoms can be substituted by F,
• wherein the liquid crystal medium further comprises one or more compounds of the following formulas IV1 to IV15:
• wherein:
• R2 and R3 respectively and independently represent any one group in the following groups represented by (1)-(3):
• (1) a linear alkyl group having 1-7 carbon atoms or a linear alkoxygroup having 1-7 carbon atoms;
• (2) a group formed by substituting —O—, —COO—, —OOC—, or —CH═CH— for one or more —CH2—in anyone group represented by (1);
• and
• (3) a group formed by substituting F, Cl, —CH═CH2, or —CH═CH—CH3 for one or more H atoms in anyone group represented by (1);
• respectively and independently represent any one group in the following groups:
• and
• wherein in formula IV4,
• are not both