Patent ID: 6912029
Filing Date: 2005-06-28
Classification: G02B,G02F

Abstract:
1. An optical film prepared by laminating at least a first retardation film having a mean in-plane refractive index of n o and a refractive index of n e in the thickness direction, wherein n e −n o >0 and Δn p ·d p =10 to 100 nm when n e −n 0 =Δnp and thickness is dp, and at least an achromatic second retardation film having a maximum in-plane refractive index of n x , a refractive index of n y in the direction perpendicular to the direction described just before, and a refractive index of n z in the thickness direction, wherein n x >n y ≧n z , and Δn·d=120 to 150 nm when n x −n y =Δn and thickness is d.