Liquid crystal composition having a negative liquid crystal mode

A liquid crystal composition comprising an additive of chemical formula 1:

• wherein R1 and R2 are each independently an alkyl having 1 to 12 carbon atoms, a hydrogen, a halogen or a cyano, respectively, and one or two nonadjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO—, wherein an oxygen atom is not directly connected to another oxygen atom,
• wherein A1, A2, A3, and A4 are each independently:
• wherein one, two, or three radicals of A1, A2, A3 and A4 are each independently:
• wherein L1 to L4 are each independently —H, —F, —Cl, —OCF3, —CF3, —CH2F, or —CHF2, and
• wherein Z1, Z2 and Z3 are each independently —COO—, —OCO—, —CF2O—, —OCF2—, —CH2O, —OCH2—, —SCH2—, —CH2S—, —CH2CH2—, —C2F4—, —CH2—CF2—, —CF2CH2—, —(CH2)z-, —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C═C—, —CH═CHCH2O—, or a single bond, and wherein when m=O, Z1 and Z2 do not represent a single bond at the same time, z is 3, 4, 5, or 6, and m is 0 or 1.