Patent ID: 7872715

Claim:
A liquid crystal display device, comprising: a first substrate; a second substrate facing the first substrate; a first polarizing plate arranged on an opposite surface to the second substrate among both sides of the first substrate; a second polarizing plate arranged on an opposite surface to the first substrate among both sides of the second substrate, and arranged so that a direction of an absorption axis of the second polarizing plate being perpendicular to a direction of an absorption axis of the first polarizing plate; a liquid crystal layer sandwiched between the first substrate and the second substrate; a color filter layer arranged between the liquid crystal layer and the first or the second substrate, the color filter layer having a plurality of pixels of two or more colors and each pixel having a reflection part and a transmission part; and a retardation thin film formed from a liquid crystal fixed layer, and arranged between the first substrate and the second substrate, wherein, in the retardation thin film, as for at least one layer among the pixels, birefringence indexes are different due to different degree of alignment of the liquid crystal fixed layer for respective regions corresponding to any one or some of respective colors, the transmission part and the reflection part, wherein the retardation thin film has in-plane birefringence index satisfying 0.75≦Δn[fr]/λd[fr]≦1.35 for a region corresponding to the reflection part of a pixel and satisfying Δn[t]<1.2×10 −3 for a region corresponding to the transmission part of a pixel, wherein λd[fr]=(d[f1]×λ[f2])/(d[f2]×λ[f1]), and wherein Δn[t] is an in-plane birefringence in a region corresponding to an image transmission part, and wherein Δn[fr] is a ratio of an in-plane birefringence index in a region corresponding to an image reflection part of a first color to an in-plane birefringence index in a region corresponding to an image reflection part of an arbitrary second color, and wherein d[f1] and d[f2] are thicknesses of retardation layers in regions corresponding to image reflection parts of the first color and the second color, respectively, and wherein λ[f1] and λ[f2] are center wavelengths of colors of image reflection parts of the first color and the second color, respectively.