Patent ID: 8314908
Filing Date: 2012-11-20
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device, comprising in the following order: a first polarizer; a first birefringent layer (I); a liquid crystal cell including a liquid crystal layer interposed between a pair of substrates facing each other, a second birefringent layer (I); a birefringent layer (II); and a second polarizer, and the device further comprising at least one birefringent layer (III) between the first birefringent layer (I) and the liquid crystal cell and/or between the liquid crystal cell and the second birefringent layer (I), the first and second birefringent layers (I) each satisfying nx>ny≧nz, having an in-plane retardation of λ/4, and having substantially the same Nz coefficient, the birefringent layer (II) satisfying nx<ny≦nz, the birefringent layer (III) satisfying nx≈ny≧nz, wherein the first birefringent layer (I) has an in-plane slow axis forming an angle of about 45° with an absorption axis of the first polarizer; the second birefringent layer (I) has an in-plane slow axis substantially orthogonal to the in-plane slow axis of the first birefringent layer (I); the second polarizer has an absorption axis substantially orthogonal to the absorption axis of the first polarizer; the birefringent layer (II) has an in-plane fast axis substantially orthogonal to the absorption axis of the second polarizer; the LC cell displays a black screen by aligning liquid crystal molecules in the liquid crystal layer substantially vertically to the substrate surface; and the liquid crystal display device satisfies the following formulae (1) to (3): where the Nz coefficient of each of the first and second birefringent layers (I) is defined as Nzq; a thickness-direction retardation of the liquid crystal cell in a black state is defined as Rlc; a sum of a thickness-direction retardation of the at least one birefringent layer (III) disposed between the first birefringent layer (I) and the second birefringent layer (I) is defined as R