Patent ID: 9274376
Filing Date: 2016-03-01
CPC Classification: G02B,G02F

Claim Text:
1. A liquid crystal display device comprising, when defining that a birefringent layer satisfying a relation of nx>ny≧nz is a first-type birefringent layer, and a birefringent layer satisfying a relation of nx<ny≦nz is a a second-type birefringent layer: a first polarizer; a second-type birefringent layer; a first first-type birefringent layer of which the in-plane retardation has been adjusted to λ/4; a liquid crystal cell haying a pair of substrates which mutually face, and haying a liquid crystal layer sandwiched between this lair of substrates; a second first-type birefringent layer having an Nz coefficient different from an Nz coefficient of the first first-type birefringent layer of which the in-plane retardation has been adjusted to λ/4; and a second polarizer in this order, wherein an in-plane slow axis of the first first-type birefringent layer forms an angle of generally 45 degrees as to an absorption axis of the first polarizer; wherein an in-plane slow axis of the second first-type birefringent layer is generally orthogonal to the in-plane slow axis of the first first-type birefringent layer; wherein an absorption axis of the second polarizer is generally orthogonal to the absorption axis of the first polarizer; wherein an in-plane fast axis of the second-type birefringent layer is generally orthogonal to the absorption axis of the first polarizer; wherein black display is performed by aligning liquid crystal molecules within the liquid crystal layer in a manner generally perpendicular to the substrate surfaces; wherein one Nz coefficient of the first first-type birefringent layer and the second first-type birefringent layer is equal to or greater than 2; and wherein the other Nz coefficient of the first first-type birefringent layer and the second first-type birefringent layer is equal to or greater than 1 but less than 2.