Lambda/4 PHASE DIFFERENCE FILM AND METHOD FOR PRODUCING SAME, CIRCULARLY POLARIZING PLATE, AND ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE

摘要

The present invention addresses the problem of providing: a lambda/4 phase difference film exhibiting excellent phase-difference-inducing properties, suitability as a thin-film, and reverse-wavelength-dispersion properties, having a low haze level, and also exhibiting excellent light resistance and coloration resistance; a method for producing the same; a circularly polarizing plate; and an organic EL display device. This lambda/4 phase difference film contains a thermoplastic resin and a compound (I), and has: a principal chain linked to the linking group of the compound (I) via two link sites thereof, and having maximum absorption at 200-280nm; and a side chain bonding to one or more of the other link sites of the linking group, and branching from a chemical structure section (X; principal chain). The lambda/4 phase difference film is characterized by satisfying (a) and (b), and in that the wavelength-dispersion properties satisfy (c) and (d). (a) Side chain having maximum-absorption wavelength of 280-380nm. (b) 25.0>=SigmaABSy/SigmaABSx>=1.01. (c) Ro(450)/Ro(550)=0.72-0.96. (d) Ro(550)/Ro(650)=0.83-0.98.