| http://www.w3.org/ns/prov#value | - the wavelength of 550 nm, said quarter wave plate having a ratio of a retardation value to a wavelength in the range of 0.2 to 0.3 when the retardation value is measured at the wavelength of 450 nm, 550 nm and 650 nm, wherein one of the optically anisotropic layers A and B is a layer made from liquid crystal molecules, and the other is a polymer film.
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