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 ?Ro is 3 to 30 nm, where ?Ro 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 ?Rc(Rc550?Rc450) equal to or greater than 0, where Rc450 is the in-plane retardation measured a wavelength of 450 nm.

Abstract: A optical film includes a thermoplastic resin and a compound wherein: (1) the absorption spectrum of said compound in solution has at least two absorption maxima in the 200-350 nm wavelength range; (2) letting ?max1 represent the wavelength of a first absorption maximum (one of the aforementioned absorption maxima) and letting ?max2 represent the wavelength of a second absorption maximum (another of the aforementioned absorption maxima) at a shorter wavelength than the first absorption maximum, (?max1??max2) is at least 20 nm; (3) the aspect ratio of the molecules of the compound is at least 1.70; (4) each molecule of the compound has a non-aromatic hydrocarbon ring, a non-aromatic heterocycle, or an aromatic heterocycle; (5) the in-plane-retardation increase sensitivity of the compound is at least 0.1; 110 nm?R0(550)?170 nm; 0.72?R0(450)/R0(550)?0.96; and 0.83?R0(550)/R0(650)?0.97.

Abstract: A retardation film includes a cellulose ether derivative and a compound having a negative intrinsic birefringence, wherein the retardation film includes: a transmittance at a wavelength of 320 to 400 nm of 89% or more; an in-plane retardation Ro550 at a wavelength of 550 nm of 115 to 160 nm; and a ratio (Ro450/Ro550) of an in-plane retardation Ro450 at a wavelength of 450 nm to the Ro550 of 0.72 to 0.94.

Abstract: An optical film includes a cellulose derivative, the film having an in-plane retardation Ro550 within 120 to 160 nm measured at 550 nm wavelength, and a ratio Ro450/Ro550 of in-plane retardations Ro450 and Ro550 within 0.65 to 0.99, respectively, measured at 450 and 550 nm wavelengths, under a 23° C. atmosphere with a relative humidity of 55%, wherein, substituents of glucose skeletons of the cellulose derivative satisfy: part of the substituents have multiple bonds, and the average degree of substitution of the substituents having multiple bonds is within 0.1 to 3.0 per glucose skeleton unit; the maximum absorption wavelength of the substituents having multiple bonds is within 220 to 400 nm; and at least part of the substituents in the glucose skeletons form ether bonds with the glucose skeletons, and the average degree of substitution of the substituents having ether bonds is within 1.0 to 3.0 per glucose skeleton unit.

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; ?Ro is 3 to 30 nm; each of ?Rc, ?Ra, 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 ?Ra to ?Ro is 0 to 80.

Abstract: A optical film includes a thermoplastic resin and a compound wherein: (1) the absorption spectrum of said compound in solution has at least two absorption maxima in the 200-350 nm wavelength range; (2) letting ?max1 represent the wavelength of a first absorption maximum (one of the aforementioned absorption maxima) and letting ?max2 represent the wavelength of a second absorption maximum (another of the aforementioned absorption maxima) at a shorter wavelength than the first absorption maximum, (?max1??max2) is at least 20 nm; (3) the aspect ratio of the molecules of the compound is at least 1.70; (4) each molecule of the compound has a non-aromatic hydrocarbon ring, a non-aromatic heterocycle, or an aromatic heterocycle; (5) the in-plane-retardation increase sensitivity of the compound is at least 0.1; 110 nm?R0(550)?170 nm; 0.72?R0(450)/R0(550)?0.96; and 0.83?R0(550)/R0(650)?0.97.

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 ?/4 phase difference film, and an organic electroluminescent element, and is characterized in that the ?/4 phase difference film satisfies formulas (1) and (2) below. Ro(450)<Ro(550)<Ro(650)??Formula (1) 0.90<photoelastic coefficient ratio(450/650)value<1.

Abstract: A method for producing a continuous polymer film includes: (1) overlapping and bonding the rear end section of a preceding raw film and the front end section of a following raw film, along a bonding line; and (2) supporting both end sections by means of a plurality of gripping tools and obliquely stretching the bonded raw film while conveying the bonded raw film in order to produce a polymer film. In the bond between the rear end section of the preceding raw film and the front end section of the following raw film, the angle (?1) between the bonding line for the polymer film and the width direction of the polymer film and the angle (?1) between the in-plane slow axis of the polymer film and the width direction of the polymer film fulfill formula (I). |?1??1|?10°??Formula (I):.