Patent ID: 9376618
Filing Date: 2016-06-28
CPC Classification: C09K,G02F

Claim Text:
1. An FFS mode liquid crystal display device comprising a first transparent insulating substrate and a second transparent insulating substrate disposed so as to face each other; a liquid crystal layer containing a liquid crystal composition and sandwiched between the first transparent insulating substrate and the second transparent insulating substrate; a common electrode composed of a transparent conductive material and disposed on the first transparent insulating substrate; a plurality of gate bus lines and a plurality of data bus lines disposed on the first transparent insulating substrate so as to form a matrix; a thin film transistor disposed at each of intersections of the gate bus lines and the data bus lines; a pixel electrode composed of a transparent conductive material and driven by the transistor, the thin film transistor and the pixel electrode being included in each pixel; and alignment films that induce homogeneous alignment and are disposed between the liquid crystal layer and the first transparent insulating substrate and between the liquid crystal layer and the second transparent insulating substrate, alignment directions of the alignment films being parallel to each other, wherein an interelectrode distance R between the pixel electrode and the common electrode is smaller than a distance G between the first transparent insulating substrate and the second transparent insulating substrate so that a fringing field is formed between the pixel electrode and the common electrode, wherein the interelectrode distance (R) being 0, the common electrode is disposed on substantially an entire surface of the first transparent insulating substrate so as to be closer to the first transparent insulating substrate than the pixel electrode, and the liquid crystal composition has a negative dielectric anisotropy, a nematic phase-isotropic liquid phase transition temperature of 60° C. or higher, and an absolute value of dielectric anisotropy of 2 or more, the liquid crystal composition having a refractive index anisotropy Δn of 0.10 or more, and the liquid crystal composition comprises: at least one compound selected from the group of compounds represented by general formula (I), at least one compound selected from the group of compounds represented by general formula (II); and one or more of compounds represented by general formula (IV), wherein the total content of the compounds represented by the general formula (I), the general formula (II), and the general formula (IV) in the liquid crystal composition is 80 to 100 mass %.