Liquid crystal dimming device

A liquid crystal dimming device comprising, from bottom to top, a lower substrate, a lower conductive layer, a lower alignment layer, a guest-host liquid crystal composition layer, an upper alignment layer, an upper conductive layer, and an upper substrate;

• wherein alignment directions of the upper alignment layer and the lower alignment layer are parallel alignment;
• wherein the guest-host liquid crystal composition layer comprises at least one dichroic dye, at least one chiral agent and at least one liquid crystal composition;
• wherein, the liquid crystal composition comprises at least one compound of general formula N:
• wherein,
• RN1 and RN2 each independently represents C1-12 linear or branched alkyl,
• one or more than two nonadjacent —CH2— in the C1-12 linear or branched alkyl can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—;
• ring
• and ring
• each independently represents
• wherein one or more —CH2— in
• can be replaced by —O—, one or more single bond in the rings can be replaced by double bond, wherein one or more —H on
• can each be independently substituted by —F, —Cl or —CN, and one or more —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, halogen, C1-3 alkyl, or C1-3 alkoxy;
• and
• nN1 represents 0, 1, 2 or 3 nN2 represents 0 or 1, and 0≤nN1+nN2≤3, when nN1=2 or 3, ring
• can be the same or different, and ZN1 can be the same or different.