Liquid crystal composition and liquid crystal display device with the liquid crystal composition

A liquid crystal composition, comprising, relative to a total weight of the liquid crystal composition:

• 8%-50% of a compound expressed by a general formula (I)
• 10%-70% by weight of a compound expressed by a general formula (II)
• 5%-50% by weight of a compound expressed by a general formula (III)
• 0-20% (by weight) of a compound expressed by a general formula (IV)
• and
• 0-15% (by weight) of compound expressed by general formula (V)
• wherein,
• R1 is a C1-10 alkyl;
• R2, R3 and R4 are independently C1-10 alkyl or alkoxy, C2-10 alkenyl or C2-10 alkenyl of which an arbitrary hydrogen atom is substituted by a fluorine atom;
• X1, X2, X3 and X4 are independently hydrogen or fluorine, wherein X1 and X2 are not simultaneously hydrogen or fluorine;
• Z is —CO—O—, —O—CO—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH2CH2—, —(CH2)4—, —C2F4—, —CH2CF2—, —CF═CF—, —CH═CH— or a single bond;
• and
• m, n are 0 or 1;
• A1, A2, A3 are trans-1,4-cyclohexylidene or 1,4-phenylene;
• A4, A5 and A6 independently represent one of the following groups:
• R5, R6 are independently C1-10 alkyl or C2-10 alkenyl;
• R7, R8 are independently C1-10 alkyl;
• X5, X6, X7 and X8 are independently hydrogen or fluorine, and for each case, only one of X5, X6, X7 and X8 can be fluorine and the others are all hydrogen.