Liquid crystal display device

摘要

The present invention provides a liquid crystal display device that allows a reduction in a voltage holding ratio (VHR) of a liquid crystal layer and an increase in an ion density (ID) in the liquid crystal layer to be suppressed and thereby addresses issues of faulty display such as white missing pixels, alignment inconsistencies, and burn-in. The liquid crystal display device according to the present invention, having a feature of suppressing the reduction in a voltage holding ratio (VHR) and the increase in an ion density (ID) in a liquid crystal layer and thereby suppressing occurrence of faulty display such as burn-in, is particularly useful as VA-mode and PSVA-mode liquid crystal display devices for active-matrix driving and may be used for liquid crystal display devices such as a liquid crystal TV, a monitor, a mobile phone, and a smart phone.

主权项

1. A liquid crystal display device comprising a first substrate, a second substrate, a liquid crystal composition layer held between the first substrate and the second substrate, a color filter including a black matrix and an RGB three-color pixel portion, a pixel electrode, and a common electrode,
wherein the liquid crystal composition layer is composed of a liquid crystal composition including one or more compounds selected from a compound group represented by General Formula (LC1) to General Formula (LC4): (where R1 and R2 each independently represent an alkyl group having a carbon number of 1 to 15; one or more CH2 groups of the alkyl group may be substituted by —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF2O—, or —OCF2— so that an oxygen atom is not directly adjacent to another oxygen atom; one or more hydrogen atoms of the alkyl group may optionally be substituted by a halogen; A1 and A2 each independently represent any one of the following structures: (in these structures, one or more CH2 groups of the cyclohexane ring may be substituted by an oxygen atom, one or more CH groups of the benzene ring may be substituted by a nitrogen atom, and one or more hydrogen atoms may be substituted by F, Cl, CF3, or OCF3); Z1 to Z4 each independently represent a single bond, —CH═CH—, —C≡C—, —CH2CH2—, —(CH2)4—, —COO—, —OCH2—, —CH2O—, —OCF2—, or —CF2O—; Z5 represents a CH2 group or an oxygen atom; at least one of Z1 and Z2is not a single bond; l1 represents 0 or 1; m1 and m2 each independently represent 0 to 3; and m1+m2is 1, 2, or 3), and wherein,in the RGB three-color pixel portion, an R pixel portion includes, as a coloring material, a diketopyrrolopyrrole-based red pigment having an average primary particle size of 5 to 50 nm as measured by small angle X-ray scattering.