Patent ID: 9442233
Filing Date: 2016-09-13
CPC Classification: C08J,G02B

Claim Text:
1. An anti-reflection circularly polarizing plate for an organic EL display, comprising: a polarizer; and a retardation film including a stretched polymer film and satisfying the following formulae (1) to (3): wherein Re[450] and Re[550] represent in-plane retardation values of the retardation film as measured at 23° C. using light with a wavelength of 450 nm and light with a wavelength of 550 nm, respectively; Δn represents an in-plane birefringence equal to (nx−ny) (where nx and ny represent refractive indexes in a slow axis direction and a fast axis direction of the retardation film, respectively); and NZ represents a ratio of a thickness-direction birefringence equal to (nx−nz) (where nz represents a refractive index in a thickness direction of the retardation film) to the in-plane birefringence equal to (nx−ny) wherein the stretched polymer film is made of an aliphatic polymer, and comprises a primary component consisting of a high molecular weight complex which comprises a main chain having a stretch-orientation property and, in a side chain, a unit having an absorption edge at a wavelength of 260 to 380 nm, wherein a plane of the side chain intersects with a direction along which the main chain extends.