| http://www.w3.org/ns/prov#value | - tical retardation film has a retardation value ???Rc???, and wherein there is a relation of formula 2 having the retardation value of the liquid crystal layer when an effective voltage ???Von??? is applied to said liquid crystal cell to be ???Ron???, R on +R c=(??/2)???(m+1)???Formula 2 where ???????? is a wavelength of light, and ???m??? is a positive integer including 0, and
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