| abstract |
(57) [Problem] To provide an object of the present invention, the shorter the measurement wavelength of one film, the smaller the phase difference and the larger the wavelength, the wider the wavelength range. An object of the present invention is to provide a retardation film that achieves λ / n such as / 4 or λ / 2. SOLUTION: This is a synthetic polymer oriented film containing at least one compound component having optical anisotropy, and composed of three or more components, and a single-layer retardation film, The retardation film has a wavelength of 450 nm, 550 nm, A retardation film characterized in that the retardation at 50 nm satisfies the following formulas (7) and (8) and a method for producing the same. R (450) <R (550) <R (650) (7) L = [((450/550) -R (450) / R (550)) 2 + ((650/550) -R (650) / R (550)) 2 ] 1/2 <0.10 (8) [where R (450), R (550), and R (650) have wavelengths of 4 The in-plane retardation of the polymer oriented film at 50 nm, 550 nm, and 650 nm. ] |