Patent ID: 8268201
Filing Date: 2012-09-18
Classification: G02B,G02F,G03F

Abstract:
1. A color filter for a liquid crystal display device, comprising: a glass substrate; and a color layer formed on the substrate and constituting color pixels of a plurality of colors, the color layer being formed through a curing of a color composition comprising at least an acrylic resin, a coloring agent, and a resin exhibiting a permeability of not less than 80% in a total wavelength range of 400 to 700 nm of visible light zone, the acrylic resin containing a copolymer formed of a first vinyl monomer having a benzyl group and a second vinyl monomer having a carboxyl group, the first vinyl monomer having a function of regulating a retardation of a color layer and a content of 76 to 91 mol % based on the solid matters of the acrylic resin, the copolymer having a weight average molecular weight of 3000 to 11000 and an acid value of solid matter falling within the range of 30 to 85, and each of color pixels exhibiting a retardation in thickness direction (Rth) falling within the range of 1 to −10 nm, Rth being a value represented by a formula Rth={(Nx+Ny)/2−Nz}×d, wherein Nx is a refractive index in x-direction in a plane of a color layer, Ny is a refractive index in the y-direction in the plane of the color layer, Nz is a refractive index in a thickness direction of the color layer, x is defined as a slow axis represented by Nx≧Ny, and d is a thickness (nm) of the color layer.