Abstract: A polycarbonate resin film of the present invention is formed from a polycarbonate resin which contains at least a constitutional unit derived from a dihydroxy compound having a bonded structure represented by the following structural formula (1) and satisfies the following expression (2) when subjected to a tensile test at a standard stretching temperature for the polycarbonate resin and at a pulling speed (strain rate) of 1,000%/min. [Chem. 1] CH2—O??(1) (No hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).) 0.9?[(lower yield stress in tension)/(upper yield stress in tension)]?1??(2).

Abstract: A polycarbonate resin film of the present invention is formed from a polycarbonate resin which contains at least a constitutional unit derived from a dihydroxy compound having a bonded structure represented by the following structural formula (1) and satisfies the following expression (2) when subjected to a tensile test at a standard stretching temperature for the polycarbonate resin and at a pulling speed (strain rate) of 1,000%/min. [Chem. 1] CH2—O??(1) (No hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).) 0.9?[(lower yield stress in tension)/(upper yield stress in tension)]?1??(2).

Abstract: There is provided a display apparatus that can suppress the occurrence of a crack in a circularly polarizing plate in its manufacturing process without reducing designability and mass productivity. A display apparatus according to an embodiment of the present invention includes: a display element; and a circularly polarizing plate placed on a viewer side of the display element. The circularly polarizing plate includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship represented by the below-indicated expression (1); and an angle ?1 formed between a slow axis of the retardation film and a direction in which a wiring crimping portion provided along at least one side of a peripheral edge portion of the display element extends satisfies a relationship represented by the below-indicated expression (2): Re(450)<Re(550)??(1) ?1?70°??(2) where Re(450) and Re(550) represent in-plane retardations measured at 23° C.

Abstract: The liquid crystal panel includes a liquid crystal cell, a first polarizer on one side of the liquid crystal cell, a second polarizer on the other side of the liquid crystal cell, a first optically anisotropic element disposed between the liquid crystal cell and the first polarizer, and a second optically anisotropic element disposed between the first optically anisotropic element and the liquid crystal cell. Absorption axes of the first and the second polarizers are perpendicular to each other. The first optically anisotropic element has a slow axis direction parallel to the absorption axis direction of the first polarizer. The second optically anisotropic element has a slow axis direction perpendicular to the absorption axis direction of the first polarizer. The first and the second optically anisotropic elements each have in-plane and thickness-direction retardation values within specific ranges, respectively.

Abstract: Provided is an optical laminate in which color unevenness resulting from an antireflection film is prevented, the optical laminate being thin and excellent in neutral black reflection hue. The optical laminate includes: a first substrate; a second substrate arranged on one side of the first substrate; an antireflection film arranged between the first substrate and the second substrate; and a resin layer arranged between the first substrate and the second substrate to cover the antireflection film, in which: the antireflection film includes a polarizer and a retardation layer bonded to the polarizer; and the resin layer has a storage modulus of elasticity at 25° C. of 1×106 Pa or more.

Abstract: A method for producing an optical film including a birefringence layer having a refractive index distribution that satisfies nx>nz>ny, by which productivity of an optical film becomes high because there are a few steps, and a contamination is reduced, is provided. The method for producing an optical film including a birefringence layer includes forming an applied film by applying a birefringence layer forming material containing a non-liquid crystalline material with a birefringence (?nxz) in the thickness direction thereof of 0.0007 or more directly on a shrinkable film, and forming a birefringence layer having a refractive index distribution that satisfies nx>nz>ny by shrinking the applied film through shrinking the shrinkable film.

Abstract: There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a ?/2 plate; and an elongated second retardation layer functioning as a ?/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15° to 30°; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.

Abstract: The retardation film of the present invention contains a thermoplastic resin and is constituted of a single layer. A value of wavelength dispersion (R450/R550) that is a ratio of a retardation R450 at a wavelength of 450 nm and a retardation R550 at a wavelength of 550 nm is 0.70 or more and 0.85 or less; and a photoelastic coefficient is 14×10?12 Pa?1 or less.

Abstract: An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of ?n?0.0140×(R450/R550)?0.0082; and a photoelastic coefficient is 25×10?12 Pa?1 or less.

Abstract: The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of R1 to R9 are the same as in the description).

Abstract: There is provided a polarizing plate that achieves an excellent reflection hue. A polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and an angle ? formed between an absorption axis of the polarizer and a slow axis of the retardation film satisfies a relationship of 38°???44° or of 46°???52°.

Abstract: The present invention provides a retardation film web having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A retardation film web of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle ? which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II): 38°???52°??(I) R450/R550<1??(II).

Abstract: The liquid crystal panel includes a liquid crystal cell, a first polarizer on one side of the liquid crystal cell, a second polarizer on the other side of the liquid crystal cell, a first optically anisotropic element disposed between the liquid crystal cell and the first polarizer, and a second optically anisotropic element disposed between the first optically anisotropic element and the liquid crystal cell. Absorption axes of the first and the second polarizers are perpendicular to each other. The first optically anisotropic element has a slow axis direction parallel to the absorption axis direction of the first polarizer. The second optically anisotropic element has a slow axis direction perpendicular to the absorption axis direction of the first polarizer. The first and the second optically anisotropic elements each have in-plane and thickness-direction retardation values within specific ranges, respectively.

Abstract: A retardation film which comprises a stretched polymer film and satisfies the following formulae (1) to (3): 0.70<Re[450]/Re[550]<0.97??(1); 1.5×10?3<?n<6×10?3??(2); and 1.13<NZ<1.50??(3), wherein: Re[450] and Re[550] represent in-plane retardation values of the retardation film as measured at 23° C. using light with a wavelength of 450 nm and light with a wavelength of 550 nm, respectively; ?n represents an in-plane birefringence equal to (nx?ny) (where nx and ny represent refractive indexes in a slow axis direction and a fast axis direction of the retardation film, respectively); and NZ represents a ratio of a thickness-direction birefringence equal to (nx?nz) (where nz represents a refractive index in a thickness direction of the retardation film) to the in-plane birefringence equal to (nx?ny).

Abstract: The present invention provides a retardation film web having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A retardation film web of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle ? which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II): 38°???52°??(I) R450/R550<1??(II).

Abstract: An object of the present invention is to provide a retardation film succeeded in solving those conventional problems, that is, a retardation film insusceptible to color dropout or color shift even under environment of severe temperature or humidity conditions and capable of being produced by a melt film-forming method. The retardation film of the present invention satisfies the relationships of the following formulae (A) and (B): 0.7<R1(450)/R1(550)<1??Formula (A): |R2(450)/R2(550)?R1(450)/R1(550)|<0.

Abstract: There is provided a circularly polarizing plate that can prevent light leakage in an organic EL panel and can suppress the warping of the panel to reduce reflection unevenness in a panel surface. A circularly polarizing plate according to an embodiment of the present invention is used in an organic EL panel, and includes a polarizer and a retardation film directly bonded to the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)<Re(550); and a 90° adhesive strength between the polarizer and the retardation film is 1.0 N/20 mm or more.

Abstract: Provided is a producing method for a retardation film with a reverse wavelength dispersion property, which is highly reliable in terms of a small wavelength dispersion change and is low in display unevenness due to a position dependence of a retardation variation. The production method is designed for a retardation film which satisfies the following formulas (1) and (2): 0.7<Re1[450]/Re1[550]<0.97??(1); and 1.5×10?3<?n<6.0×10?3??(2) (where: Re1[450] and Re1[550] represent, respectively, in-plane retardation values thereof as measured by using light of a wavelengths of 450 nm and light of a wavelength of 550 nm, at 23° C.; and ?n represents an in-plane birefringence thereof as measured by using light of a wavelength of 550 nm).

Abstract: Provided is a method capable of producing a retardation film suppressed in biaxiality, having a small Nz coefficient, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right side edge portions of a film to be stretched with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; reducing, under a state in which a position at which the clip pitch of the clips on one side out of the left and right clips starts to reduce and a position at which the clip pitch of the clips on another side starts to reduce are set to different positions in the longitudinal direction, the clip pitch of each of the clips to a predetermined pitch to subject the film to oblique stretching; and releasing the clips holding the film.

Abstract: Provided is a method capable of producing a retardation film being excellent in axial accuracy, showing small changes in retardation and dimensions at the time of its heating, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; causing the clip pitches of the left and right clips to each independently change to obliquely stretch the film; reducing the clip pitches of the left and right clips to shrink the film in the longitudinal direction; and releasing the film from being held with the clips.