OPTICAL FILM, POLARIZING FILM USING THE OPTICAL FILM, AND METHOD OF IMPROVING VISIBILITY ANGLE OF POLARIZING FILM

摘要

The invention provides an optical film prepared by laminating at least one of a first retardation film (2), having a mean in-plane refractive index of n0 and refractive index in the thickness direction of ne wherein ne- no > 0, and at least one of a second retardation film (3) having an in-plane refractive index of nx in the direction showing the maximum refractive index, refractive index of ny in the direction perpendicular to the direction described just before, and refractive index in the thickness direction of nz wherein nx > ny ≥nz. The light leakage occurred as the observation point is tilted from the front direction to a direction different from the direction of each absorption axis can be reduced when a plolarizing film is arranged so that the absorption axes will be perpendicular to each other.