Wide-viewing angle compensation film and transmission type liquid-crystal display employing the same

A wide-viewing angle compensation film comprising a polarizing plate and an optical compensation film which exhibits negative birefringence and has an in-plane retardation (Re1) as represented by the following equation (1) of 60-220 nm and an orientation parameter (Nz) as represented by the following equation (2) in the range of 0±0.05, the optical compensation film exhibiting negative birefringence and the polarizing plate being stacked so that the slow axis of the compensation film is perpendicular or parallel to the absorption axis of the polarizing plate:

• Re1=(nx1−ny1)×d1 (1)
• Nz=(nx1−nz1)/(nx1−ny1) (2)
• wherein nx1, ny1, and nz1 respectively represent the x-axis-direction refractive index, y-axis-direction refractive index, and z-axis-direction refractive index of the optical compensation film, provided that the x axis is an in-plane direction of the film parallel to the slow axis of the film, the y axis is an in-plane direction of the film perpendicular to the x axis, and the z axis is an out-of-plane direction of the film perpendicular to the x axis;
• and d1 represents the thickness of the optical compensation film.