Retardation film, circularly-polarizing plate, and image-displaying device
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United States of America Patent
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Aug 4, 2020
Grant Date -
Feb 2, 2017
app pub date -
Oct 14, 2016
filing date -
Apr 16, 2014
priority date (Note) -
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Abstract
The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0:
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