Liquid crystal mixture and light modulating device

A liquid crystal mixture applied in light modulating devices, comprising:

• component A comprised of one or more compounds selected from the group of compounds of formula I
• R1-MG1-X-MG2-R2 I;
• component B comprised of one or more compounds selected from the group of compounds of formula II
• and component C comprised of one or more chiral compounds,
• wherein
• R1, R2, R3 and R4 each independently denote —H, —F, —Cl or a chain alkyl group with 1 to 25 C atoms where one or more H atom may be independently substituted by halogen and one or more nonadjacent —CH2— may be independently replaced by —O—, —CH═CH—, —CH═CF— or —CF═CF—,
• MG1 and MG2 each independently denote a mesogenic group,
• X is a straight-chain or branched alkyl group with 3-40 C atoms where one or more —CH2— may be independently replaced by —O—, —CH(F)—, —CH(Cl)— or —CH═CH— in such a manner that no two —O— or double bonds are adjacent to one another,
• H1, H2 and H3 each independently denote a ring structure selected from the group of
• and their mirror structures where one or more H atoms may be independently substituted by halogen or a alkyl group with 1-10 C atoms,
• A1 and A2 each independently denote —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH═CH—, —CF2CF2—, —CF═CF—, —CH═CF—, a single bond or —(CH2)a— where a is an even number between 2-10,
• m is 0,1 or 2, n is 1, 2 or 3, o is 1 or 2, and m+n+o is no more than 5.