Liquid crystal composition and liquid display device

A liquid crystal composition comprising at least one compound of general formula I-1, at least two compounds of general formula II and at least two compounds of general formula III:

• wherein, R1 represents —H, C1-12 halogenated or unhalogenated linear alkyl, C3-12 halogenated or unhalogenated branched alkyl, C1-12 halogenated or unhalogenated alkoxy, C2-12 halogenated or unhalogenated alkenyl, C2-12 halogenated or unhalogenated alkenoxy,
• R2-R5 each independently represents C1-12 linear alkyl, C3-12 branched alkyl, C1-12 alkoxy, C2-12 alkenyl, C2-12 alkenoxy,
• one or at least two —CH2— in
• can be replaced by —O—, one or at least two single bond in the rings can be replaced by double bond, and one or at least two single bond in at least one ring
• is replaced by double bond;
• ring
• each independently represents
• one or at least two —H on
• can each be independently replaced by —F, —Cl, —CN, —CH3 or —OCH3, one or at least two —CH═ in the rings can be replaced by —N═;
• L1-L6 each independently represents halogen atom;
• X1 and X2 each independently represents —O— or —S—;
• n2 represents 1 or 2, when n2 represents 2, ring
• is the same or different;
• and
• n3 represents 0, 1, 2 or 3, n4 represents 0 or 1, and 2≤n3+n4≤3;
• when n3 represents 2 or 3, ring
• is the same or different;
• in the liquid crystal composition, percentage by weight of the at least one compound of general formula I-1 is 1%-20%;
• in the liquid crystal composition, percentage by weight of the at least two compounds of general formula II is 15%-36%;
• in the liquid crystal composition, percentage by weight of the at least two compounds of general formula III is 3%-15%;
• the liquid crystal composition further comprises at least one compound of general formula N:
• wherein, RN1 and RN2 each independently represents C1-12 linear alkyl, C3-12 branched alkyl,
• wherein one or at least two nonadjacent —CH2— in the C1-12 linear alkyl and C3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
• ring
• each independently represents
• wherein one or at least two —CH2— in
• can be replaced by —O—;
• one or at least two —H on
• can each be independently replaced by —F, —Cl or —CN, one or at least two —CH═ in the rings can be replaced by —N═;
• ZN1 and ZN2 each independently represents single bond, —CO—O—, —O—CO—, —CH2O—, —OCH2—, —CH═CH—, —C≡C—, —CH2CH2—, —CF2CF2—, —(CH2)4—, —CF2O— or —OCF2—;
• LN1 and LN2 each independently represents —H, C1-3 alkyl, or halogen atom;
• nN1 represents 0, 1, 2 or 3, nN2 represents 0 or 1, and 0≤nN1+nN2≤3, wherein when nN1 represents 2 or 3, ring
• is the same or different, and ZN1 is the same or different;
• and
• substituted or unsubstituted terphenyl structure is not contained in the compound of general formula N, the substituent for substitution is selected from —F, —Cl or —CN;
• in the liquid crystal composition, percentage by weight of the at least one compound of general formula N is 5%-25%;
• the liquid crystal composition further comprises at least one compound of general formula M:
• wherein, RM1 and RM2 each independently represents C1-12 linear alkyl, C3-12 branched alkyl,
• wherein one or at least two nonadjacent —CH2— in the C1-12 linear alkyl and C3-12 branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
• ring
• each independently represents
• wherein one or at least two —CH2— in
• can be replaced by —O—, one or at least two single bond in the rings can be replaced by double bond;
• at most one —H on
• can be replaced by halogen atom;
• ZM1 and ZM2 each independently represents single bond, —CO—O—, —O—CO—, —CH2O—, —OCH2—, —C≡C—, —CH═CH—, —CH2CH2— or —(CH2)4—;
• nM represents 0, 1 or 2, wherein when nM represents 2, ring
• is the same or different, ZM2 is the same or different;
• in the liquid crystal composition, percentage by weight of the at least one compound of general formula M is 30%-50%.