An optical film in which a polarizing plate and a retardation film are laminated
so that an absorbing axis of the polarizing plate and a slow axis of the retardation
film may be perpendicular or may be parallel to each other, wherein a value Nz
represented by Nz=(nx1-nz1)/(nx1-ny1)
satisfies a range of 0.4 through 0.6, and an in-plane retardation Re1=(nx1-ny1)d1
is 200 through 350 nm, where, a direction of the retardation film in which an in-plane
refractive index within the film surface concerned gives a maximum is defined as
X-axis, a direction perpendicular to X axis is defined as Y-axis, a thickness direction
of the film is defined as Z-axis, refractive indexes in axial direction are defined
as nx1, ny1, nz1, respectively, and a thickness
of the film is defined as d1 (nm), may realize an easily viewable display
with high contrast ratio in a wide range when applied to a display system, preferably
used for a liquid crystal display operating in IPS mode.