Elliptically polarizing plate and liquid crystal display
AssigneeKent State University
InventorsJack Kelly, Tatiana Sergan, Marina Lavrentovich, Yuuichi Nishikouji, Tadayuki Kameyama
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Abstract
An elliptically polarizing plate, comprising a polarizer, a first optical anisotropic layer having positive refractive index anisotropy and an optical axis of the anisotropy that is tilted, and a second optical anisotropic layer having negative refractive index anisotropy and an optical axis that is tilted, have accurate retardation compensation of a liquid crystal cell, and the liquid crystal display maintains a display contrast having a sufficient visibility when the viewing angle is changed and which does not generate colorization.
Claims11
An elliptically polarizing plate, comprising a polarizer,
- a first optical anisotropic layer having positive refractive index anisotropy and an optical axis of the anisotropy that is tilted,
- and a second optical anisotropic layer having negative refractive index anisotropy and an optical axis that is tilted.
A liquid crystal display comprising a liquid crystal cell of twisted nematic mode, and at least a first optical compensation layer provided on at least one side of the liquid crystal cell, the first optical compensation layer containing an elliptically polarizing plate, wherein the elliptically polarizing plate contains a polarizer, a first optical anisotropic layer having positive refractive index anisotropy and an optical axis of the anisotropy that is tilted, and a second optical anisotropic layer having negative refractive index anisotropy and an optical axis that is tilted.
Dependencies are inferred from the claim text.