Patent ID: 7619818
Filing Date: 2009-11-17
Classification: G02B,G02F

Abstract:
1. An elliptically polarizing plate, comprising: a polarizer; and an optical film that comprises a laminate of: a retardation film A that comprises a cyclic polyolefin resin-containing thermoplastic polymer and has uniaxially-aligned positive refractive-index anisotropy characterized by nx>ny≈nz, wherein nx is a refractive index in the direction of an X axis, along which the in-plane refractive index is maximum, ny is a refractive index in the direction of a Y axis, perpendicular to the X axis, and nz is a refractive index in the direction of a Z axis that is the direction of the thickness; and a retardation film B that is fixed to homeotropic alignment and has positive refractive-index anisotropy characterized by nz the optical film is laminated on one side of the polarizer in such a manner that a slow axis of the retardation film A is perpendicular to an absorption axis of the polarizer; wherein the optical film is laminated in such a manner that the retardation film A and the retardation film B are placed in this order from the polarizer; and wherein the elliptically polarizing plate is used in such a manner that the optical film side faces an in-plane switching (IPS) mode liquid crystal cell.