Patent ID: 7880840

Claim:
A method for producing a vertical alignment type liquid crystal display, comprising steps of: treating an optical film comprising cellulose ester with an aqueous solution of sodium hydroxide to prepare an alkali-treated optical film; immersing a polyvinyl alcohol film in an aqueous solution containing iodine and boric acid; stretching the polyvinyl alcohol film to prepare a polarizing film; adhering the alkali-treated optical film onto both surfaces of the polarizing film to prepare a polarizing plate; and providing the polarizing plate on both surfaces of a vertical alignment type liquid crystal cell to providing the vertical alignment type liquid crystal display, wherein at least one of the optical film has a retardation value (Rt value) in the thickness direction of from 60 to 300 nm, Rt =[( nx+ny )/2 −nz]×d wherein nx represents the refractive index of the optical film in the direction giving maximum refractive index in the plane of the film, ny represents the refractive index of the optical film in the direction perpendicular to the direction giving maximum refractive index in the plane of the film, nz represents the refractive index of the optical film in the thickness direction and d represents the thickness (in nm) of the optical film.