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AssigneeSharp Kabushiki Kaisha
InventorsMotohiro Yamahara, Kei Sasaki, Teruyoshi Hara, Shuichi Kohzaki
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A phase difference plate capable of eliminating contrast changes due to viewing angle changes of display image, coloring phenomenon of display screen, and black and white reversal phenomenon, and a liquid crystal display device capable of displaying images of high quality are presented. A phase difference plate is a drawn and elongated material possessing optical anisotropy such as high polymer compound formed in a flat plate form, and the direction of the minimum principal refractive index na of the three principal refractive indices na, nb, nc of the index ellipsoid is parallel to the y-axis direction, and the direction of the principal refractive index nb is inclined to the normal direction of the surface.
A flat phase difference plate forming a material having optical anisotropy, wherein of the three principal refractive indices of an index ellipsoid, the direction of the minimum principal refractive index is parallel to a surface of the flat plate, and the directions of the other principal refractive indices are inclined to the surface.
A phase difference plate composed by stacking first and second phase difference plates each comprising a plate in which a principal refractive index nb of a refractive index ellipsoid in the normal direction to the surface of the plate is smaller than principal refractive indices na and nc of the index ellipsoid within the surface thereof,
A liquid crystal display device comprising:
Dependencies are inferred from the claim text.