Phase difference plate comprising polymer film containing compound having rod-shaped molecular structure
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United States of America Patent
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Jul 14, 2009
Grant Date -
Jul 6, 2006
app pub date -
Mar 7, 2006
filing date -
Mar 14, 2001
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Abstract
A phase difference plate which comprises one sheet of polymer film containing a compound having a rod-shaped molecular structure and exhibiting a maximum absorption wavelength (λmax) of less than 250 nm in an ultraviolet spectrum of its solution and which exhibits a retardation value as measured at a wavelength of 450 nm (Re450) of 60 to 135 nm and a retardation value as measured at a wavelength of 590 nm (Re590) of 100 to 170 nm, where the relationship: Re590−Re450≧2 nm is satisfied. The phase difference plate functions as a λ/4 plate.
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