Optical member

An optical member, comprising a substrate layer and a structural layer formed on one surface or both surfaces of the substrate layer and having an array of a plurality of repeated, curved three-dimensional structures,

• wherein each of the curved three-dimensional structures of the structural layer has a height that is a peak of the curved three-dimensional structure and a distance that is a pitch of the repeated three-dimensional structures, and each of the curved three-dimensional structure is comprised of, when viewed in longitudinal cross-section, a center first zone having a predetermined curvature k in both directions from a peak thereof, as represented by Equation 1 below in an x-axis and y-axis coordinate system in which the peak is set to an origin of the system, and two second zones abutting on both sides of the first zone and having an inclination angle relative to the substrate layer:
• k
• =
• -
• 2
• ⁢
• y
• x
• 2
• Equation
• ⁢
• ⁢
• 1
• (wherein x is a real number other than 0, and y and k are real numbers);
• the first zone has a curvature k of 0.05-0.30;
• each of the second zones has an inclination angle of 30-50° or 130-150° relative to the substrate layer;
• the pitch of each of the three-dimensional structures, which is defined as the distance of the individual three-dimensional structure in contact with the substrate layer and is a sum of the distance of the first zone in contact with the substrate layer and the distances of the second zones in contact with the substrate layer, is 100-500 μm and the height of each of the three-dimensional structures is 25-300 μm;
• and
• the distance of the first zone in contact with the substrate layer is ⅓-⅗ of the pitch.