Patent ID: 8687155

Claim:
A liquid crystal display device comprising: a first substrate comprising a first insulative substrate, a common electrode disposed on an inner surface side of the first insulative substrate, an insulation film covering the common electrode, a pixel electrode which is disposed above the insulation film, opposed to the common electrode and provided with a slit, and a first alignment film covering the pixel electrode; a second substrate comprising a second insulative substrate and a second alignment film disposed on an inner surface side of the second insulative substrate, the inner surface side of the second insulative substrate being opposed to the pixel electrode; a liquid crystal layer held between the first substrate and the second substrate; a first polarizer disposed on an outer surface side of the first insulative substrate; a second polarizer disposed on an outer surface side of the second insulative substrate; and a first retardation plate and a second retardation plate, which are stacked between the second insulative substrate and the second polarizer, wherein, with respect to the first retardation plate and the second retardation plate, when refractive indices in two directions, which are perpendicular to each other in a plane of each of the first retardation plate and the second retardation plate, are nx and ny, respectively, a refractive index in a thickness direction is nz, a thickness is d, and a retardation in the thickness direction, which is defined by ((nx+ny)/2âˆ’nz)*d, is Rth, the first retardation plate has a negative first retardation Rth 1 , the second retardation plate has a positive second retardation Rth 2 , a sum of the first retardation Rth 1 and the second retardation Rth 2 is âˆ’40 nmÂ±20 nm with respect to light with a wavelength of 550 nm, and a contribution degree of the second retardation Rth 2 , which is defined by |Rth 2 |*100/(|Rth 1 |+|Rth 2 |), is 40%Â±3% wherein the second retardation plate has a refractive index anisotropy of nx>ny>nz.