US 2017/0369782 A1 · LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE

Abstract

To provide a liquid crystal composition having at least one or a suitable balance regarding two of characteristics such as high maximum or low minimum temperature of a nematic phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, large specific resistance, high stability to ultraviolet light or heat and a large elastic constant; and an AM device including the composition and having a short response time, a large voltage holding ratio, low threshold voltage, a large contrast ratio, a long service life and so forth. The liquid crystal composition contains a quencher as an additive component and a specific compound having large positive dielectric anisotropy as a first component, and a liquid crystal display device includes the composition. The composition may contain a specific compound having high maximum temperature or small viscosity as a second component, or a specific compound having negative dielectric anisotropy as a third component.

Claims18

Dependent claims

A liquid crystal composition that has a nematic phase and positive dielectric anisotropy, and contains at least one quencher as an additive component and at least one compound selected from the group of compounds represented by formula (2) as a first component:

wherein, in formula (2), R1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons;
ring A is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl;
Z1 is a single bond, ethylene, carbonyloxy or difluoromethyleneoxy;
X1 and X2 are independently hydrogen or fluorine;
Y1 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one piece of hydrogen is replaced by fluorine or chlorine, alkoxy having 1 to 12 carbons in which at least one piece of hydrogen is replaced by fluorine or chlorine, or alkenyloxy having 2 to 12 carbons in which at least one piece of hydrogen is replaced by fluorine or chlorine;
and a is 1, 2, 3 or 4.

3 more elements

Dependencies are inferred from the claim text.

Liquid crystal composition and liquid crystal display device

Life of this patent

Liquid crystal composition and liquid crystal display device

Life of this patent

Abstract

Claims18