Abstract: Provided is an optical film that can eliminate rainbow unevenness when viewed with the naked eyes and provide favorable color tone uniformity when viewed at an oblique angle. This optical film has a low-refractive index layer on a plastic film, the plastic film has a slow axis that is an axis with the largest refractive index in a plane, and a fast axis that is an axis orthogonal to the slow axis in the plane of the plastic film, and the low-refractive index layer is located on the surface of the optical film. Linearly polarized light is incident, under predetermined conditions, from a surface on a side opposite to the low-refractive index layer of the optical film, and transmitted light of the linearly polarized light is used to measure the a* value and b* value of the L*a*b* color system at 11 measurement points with different angles.

Abstract: The present disclosure addresses the problem of providing an optical plastic film such that rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses can be suppressed without any axis alignment or increase in the in-plane phase difference.

Abstract: The present disclosure addresses the problem of providing an optical plastic film such that rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses can be suppressed without any axis alignment or increase in the in-plane phase difference.

Abstract: Provided is an optical film that can eliminate rainbow unevenness when viewed with the naked eyes and provide favorable color tone uniformity when viewed at an oblique angle. This optical film has a low-refractive index layer on a plastic film, the plastic film has a slow axis that is an axis with the largest refractive index in a plane, and a fast axis that is an axis orthogonal to the slow axis in the plane of the plastic film, and the low-refractive index layer is located on the surface of the optical film. Linearly polarized light is incident, under predetermined conditions, from a surface on a side opposite to the low-refractive index layer of the optical film, and transmitted light of the linearly polarized light is used to measure the a* value and b* value of the L*a*b* color system at 11 measurement points with different angles.

Abstract: The present disclosure addresses the problem of providing a polyester film having favorable pencil hardness without an increase in the thickness. Disclosed is a polyester film having an average Martens hardness of 140.0 N/mm2 or more at a polyester film surface, wherein a standard deviation 36 of Martens hardness at the polyester film surface is 9.0 N/mm2 or more and 36.0 N/mm2 or less.

Abstract: The present disclosure addresses the problem of providing an optical plastic film having favorable pencil hardness without an increase in the in-plane phase difference. Disclosed is an optical plastic film comprising a first surface and a second surface that is a surface on a side opposite to the first surface, wherein the plastic film has an in-plane phase difference of 300 nm or more and 1,450 nm or less, and in a region within a depth of 20 ?m from the first surface in a direction from the first surface to the second surface, an average of an erosion rate is 1.4 ?m/g or more.

Abstract: Provided is an optical laminate that is excellent in terms of adhesion between a polyester film having a high degree of plane orientation ?P and an easy adhesive layer and suppresses a local defect without using an easy adhesive layer of a specific material. The easy adhesive layer, an uneven layer, and an antifouling layer are provided on the polyester film, when a refractive index in a slow axis direction in a plane of the polyester film is defined as nx, a refractive index in a direction orthogonal to the slow axis in the same plane is defined as ny, and a refractive index in a thickness direction of the polyester film is defined as nz, the polyester film satisfies the following formula 1-2, and, regarding the uneven layer, when a three-dimensional skewness of a surface of the uneven layer is defined as Ssk, and a three-dimensional arithmetic average roughness of the surface of the uneven layer is defined as Sa, Ssk and Sa satisfy the following formula 2-1. 0.140 ? ? P ­­­(1-2) 0.

Abstract: The present disclosure addresses the problem of providing an optical plastic film such that rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses can be suppressed without any axis alignment or increase in the in-plane phase difference.

Abstract: Provided is an anti-glare antireflection member capable of suppressing coloring in viewing in an oblique direction, and suppressing visual recognition of local luminescent spots. The anti-glare antireflection member comprises an anti-glare layer and a low refractive index layer on a substrate. The average of ?d is 7.0 nm or more and 40.0 nm or less, where ?d is a thickness difference of the low refractive index layer in an arbitrary 2 mm×2 mm region of the anti-glare anti refractive index layer.

Abstract: Provided is an optical film that can suppress rainbow unevenness when viewed with the naked eyes without increasing the in-plane phase difference. The optical film has a low-refractive index layer on a plastic film, the plastic film is a biaxially stretched plastic film with an in-plane phase difference of 2500 nm or less, the low-refractive index layer is located on the outermost surface, and the optical film has a region in which ?Eab satisfies specific conditions, wherein the ?Eab is calculated from the differences between the L* value, the a* value, and the b* value obtained by measuring a laminate 1 including the optical film, the polarizer, and the surface light source under specific conditions and the L* value, the a* value, and the b* value obtained by measuring a laminate 2 including the polarizer and the surface light source under specific conditions, respectively.

Abstract: Provided are an optical biaxially stretched plastic film, a polarizing plate, and an image display device that can suppress blackouts when viewed with polarized sunglasses, polarized goggles or the like without increasing the in-plane phase difference. In addition, a method for selecting an optical biaxially stretched plastic film is provided. The optical biaxially stretched plastic film has a region satisfying condition 1 and condition 2 below: <Condition 1> the difference between a luminance obtained in a specific measurement 1 and a luminance obtained in a specific measurement 2 (L1.n?L2.n) is calculated at each of 100 measurement points, and the “luminance difference variation 3?” calculated from the luminance differences at the 100 measurement points is 100 or more; and <Condition 2> the in-plane phase difference (Re) is 2500 nm or less.