Patent ID: 6831722
Filing Date: 2004-12-14
Classification: G02F

Abstract:
An optical compensation film for Normally White Twisted Nematic liquid crystal displays operating in Extraordinary mode comprising first and second optically anisotropic layers containing positively bireflingent material disposed on a substrate, wherein the optic axis of said first optically anisotropic layer tilts in a first plane with an average tilt angle between 25Â° and 70Â°, and the optic axis of said second optically anisotropic layer tilts in a second plane with an average tilt angle between 0Â° and 40Â°, and the difference between said average tilt angle of said first optically anisotropic layer and said average tilt angle of said second optically anisotropic layer is no less than 10Â°, said first and said second planes are perpendicular to a plane of said optical compensation film, and the angle between said first and said second plane is 90Â±10Â°.