Patent ID: 7920238
Filing Date: 2011-04-05
Classification: G02F

Abstract:
1. A liquid crystal display apparatus comprising: a first polarization layer located on one side of a first substrate; a second polarization layer located on the other side of a second substrate; a liquid crystal layer formed of liquid crystal molecules and located between said first and second substrates such that said liquid crystal molecules are aligned in parallel to said first or second substrate and in one direction and thereby make a black state possible; and a lighting device, wherein an absorption axis of said first polarization layer is substantially perpendicular to an absorption axis of said second polarization layer; said first polarization layer is located on a side of said lighting device; said absorption axis of said first polarization layer is substantially perpendicular to a slow axis on a plane of said liquid crystal layer; refractive index of a portion between said liquid crystal layer and said second polarization layer is substantially isotropic; a first retardation film and a second retardation film are located between said liquid crystal layer and said first polarization layer; said first retardation film satisfies any one of following cases (1) to (4) under conditions that n1 is a planar refractive index in a slow axis direction, n2 is a planar refractive index in a fast axis direction and n3 is a refractive index in a thickness direction, (1) said first retardation film satisfies 0.5<(n1−n3)/(n1−n2)<0.8, and said second retardation film satisfies (n1−n3)/(n1−n2)<0.5 (2) said first retardation film satisfies 1.2<(n1−n3)/(n1−n2)<5, and said second retardation film satisfies (n1−n3)/(n1−n2)<0.5 (3) said first retardation film satisfies 0.5<(n1−n3)/(n1−n2), and said second retardation film satisfies 0.2<(n1−n3)/(n1−n2)<0.5 (4) said first retardation film satisfies 0.5<(n1−n3)/(n1−n2), and said second retardation film satisfies −5<(n1−n3)/(n1−n2)<0.2; wherein,