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Optical phase retardation film

The present invention provides an optical phase retardation film comprising a polymer comprising at least about 40 percent by weight chlorotrifluoroethylene. The present invention also provides an optical phase retardation film comprising a halogen-containing polymer wherein: (a) the film has refractive indices n.sub.x, n.sub.y, and n.sub.z associated with its axes x, y, and z: (b) the x and y axes are in the plane of the film and perpendicular to each other; (c) the z axis is perpendicular to the plane of the film; and (d) n.sub.x .gtoreq.n.sub.y >n.sub.z. The optical phase retardation film is useful in a liquid crystal display device. The present invention also provides a liquid crystal display device comprising: (a) a first polarizer; (b) liquid crystal cell having transparent electrodes; (c) an optical phase retardation film comprising a polymer comprising at least about 40 percent by weight chlorotrifluoroethylene; and (d) a second polarizer wherein the liquid crystal cell and optical phase retardation film are located between the first and second polarizers.

Patent Information

NumberUS  5550661
CountryUS
StatusIssued
Date08/27/1996


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