Patent ID: 7270858

Claim:
An inclined optical compensation film comprising: a non-liquid crystal polymer; wherein the non-liquid crystal polymer is inclined and aligned, a retardation value measured from a direction of a measuring axis varies asymmetrically between a + side and a − side of a measuring angle with respect to the retardation value at 0°, when the 0° corresponds to a normal line of a surface of the inclined optical compensation film and the measuring angle denotes an angle between the normal line and the measuring axis (including 0°), a birefringence (Δn) represented by the equation below that ranges from 0.001 to 0.5, Δ n =[{( nx+ny )/2 }−nz]·d/d where Δn represents the birefringence of the inclined optical compensation film, nx, ny and nz respectively represent refractive indices in directions of an X axis, a Y axis and a Z axis in the inclined optical compensation film, with the X axis being an axial direction exhibiting a maximum refractive index within the surface of the inclined optical compensation film, the Y axis being an axial direction perpendicular to the X axis within the surface and the Z axis being a thickness direction perpendicular to the X axis and the Y axis, and d represents a thickness of the inclined optical compensation film, the non-liquid crystal polymer is at least one polymer selected from the group consisting of polyamide, polyimide, polyester, polyetherketone, polyamide imide and polyesterimide, the inclined optical compensation film is prepared from a coating film made of the non-liquid crystal polymer, and the thickness of the inclined optical compensation film is 0.5 to 20 μm.