Abstract:
The retardation film has a slow axis with an angle of 10 to 80° with respect to a longitudinal direction thereof and contains cellulose acylate having a degree of acyl substitution of 2.0 to 2.7 and a regulating agent. The retardation film has an in-plane retardation, measured at a wavelength of 550 nm, Ro550, of 115 to 260 nm. The retardation film has a ΔRo is 3 to 30 nm, where ΔRo is Ro550−Ro450, where Ro450 is the in-plane retardation of the film measured at a wavelength of 450 nm. The retardation film without the regulating agent has an in plane retardation, measured at a wavelength of 550 nm, Rc550, and ΔRc(Rc550−Rc450) equal to or greater than 0, where Rc450 is the in-plane retardation measured a wavelength of 450 nm.
Abstract:
Disclosed is a retardation film which has a slow axis with an angle of 10 to 80° with respect to a longitudinal direction thereof, wherein the retardation film contains cellulose acylate having a degree of acyl substitution of 2.0 to 2.7, and wherein: Ro550 is 115 to 160 nm; ΔRo is 3 to 30 nm; each of ΔRc, ΔRa, and Rc and Ra at a wavelength of 550 nm is equal to or greater than 0; a retardation share ratio of Ra550 to Ro550 is 10 to 80; and a wavelength-dispersion share ratio of ΔRa to ΔRo is 0 to 80.
Abstract:
In order to provide an organic electroluminescent display device which does not exhibit redness in reflected external light, and exhibits little fluctuation in the hue of a black image as a result of changes in environmental temperature and differences in the light emitting state, the organic electroluminescent display device according to the present invention comprises, in order from the viewing side, a protective film, a polarizer, a λ/4 phase difference film, and an organic electroluminescent element, and is characterized in that the λ/4 phase difference film satisfies formulas (1) and (2) below. Ro(450)