Quarter wave plate comprising two optically anisotropic layers
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United States of America Patent
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Jul 15, 2003
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N/A
app pub date -
Apr 10, 2002
filing date -
Nov 6, 1998
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Abstract
A circularly polarizing plate comprises a linearly polarizing membrane and a quarter wave plate. The quarter wave plate comprises an optically anisotropic layer A and an optically anisotropic layer B. The quarter wave plate has such an optical characteristic that a retardation value essentially is a quarter of a wavelength when the retardation value is measured at the wavelength of 450 nm, 550 nm and 650 nm. One of the optically anisotropic layers A and B is a layer made from liquid crystal molecules, and the other is a polymer film or a layer made from liquid crystal molecules.
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