Liquid crystal display device and useful liquid crystal composition

摘要

Provided is a liquid crystal display device of VAIPS mode, which uses a liquid crystal material having negative dielectric anisotropy (Δ∈<0), and has a high response speed, a wide viewing angle, a high transmittance at the time of light transmission, a high black level at the time of light blockage, and an excellent contrast ratio. Disclosed is a liquid crystal display device including a first substrate, a second substrate, and a liquid crystal composition layer having negative dielectric constant, which is interposed between the first substrate and the second substrate, the liquid crystal display device being an electro-optical display device which has a plurality of pixels, and in which each of the pixels is independently controllable and has a pair of a pixel electrode and a common electrode, the two electrodes are provided on at least one substrate of the first substrate and the second substrate, and the long axis of the liquid crystal molecules of the liquid crystal composition layer is in a substantial vertical alignment or a hybrid alignment with respect to the substrate surface.

主权项

1. A liquid crystal display device comprising:
a first substrate; a second substrate; and a liquid crystal composition layer having negative dielectric anisotropy that is interposed between the first substrate and the second substrate, the liquid crystal display device having a plurality of pixels, with each of the pixels being independently controllable, the pixel comprising a pair of a pixel electrode and a common electrode, wherein the pixel electrode and the common electrode are provided on at least one substrate between the first substrate and second substrate, and the long axis of liquid crystal molecules in the liquid crystal composition layer being in a substantial vertical alignment or a hybrid alignment with respect to at least one substrate, wherein the liquid crystal composition of the liquid crystal composition layer comprises two or more kinds of compounds selected from the group of compounds represented by General Formula (LC1) to General Formula (LC5): wherein R1 and R2 each independently represent an alkyl group having 1 to 15 carbon atoms; one or more CH2 groups in the alkyl group are substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —CF2O— or —OCF2— such that O atoms are not directly adjacent to each other; one or more H atoms in the alkyl group may be optionally substituted by halogen; A1 and A2 each independently represent any one of the following structures: wherein one or more CH2 groups of the cyclohexane ring in the structures may be substituted by 0 atoms; one or more CH groups of the benzene ring in the structures may be substituted by N atoms; and one or more H atoms may be substituted by Cl, CF3 or OCF3; Z1 to Z4 each independently represent a single bond, —CH═CH—, —CH2CH2—, —(CH2)4—, —COO—, —OCH2—, —CH2O—, —OCF2— or —CF2O—, while at least one of Z1 and Z2 is not a single bond; Z5 represents a CH2 group or an O atom; m1 and m2 each independently represent 0 to 3, and m1+m2 is 1, 2 or 3.