Microlens for organic EL element, organic EL element using the same, and manufacturing methods thereof

摘要

A microlens for an organic EL element, which is used by being disposed on a light-emitting surface of the organic EL element, said microlens comprising a cured resin layer having concavities and convexities formed on a surface thereof, wherein when a Fourier-transformed image is obtained by performing two-dimensional fast Fourier transform processing on a concavity and convexity analysis image obtained by analyzing a shape of the concavities and convexities by use of an atomic force microscope, the Fourier-transformed image shows a circular or annular pattern substantially centered at an origin at which an absolute value of wavenumber is 0 μm−1, and the circular or annular pattern is present within a region where an absolute value of wavenumber is within a range of 1 μm−1 or less.

主权项

1. A method for manufacturing a microlens for an organic EL element, comprising the steps of:
applying a curable resin onto one surface of a supporting base member, curing the curable resin with a master block being pressed thereto, and thereafter detaching the master block, thereby forming a cured resin layer having concavities and convexities formed on a surface thereof, to obtain a microlens for an organic EL element, said microlens comprising the cured resin layer having concavities and convexities formed on a surface thereof, wherein when a Fourier-transformed image is obtained by performing two-dimensional fast Fourier transform processing on a concavity and convexity analysis image obtained by analyzing a shape of the concavities and convexities by use of an atomic force microscope, the Fourier-transformed image shows a circular or annular pattern substantially centered at an origin at which an absolute value of wavenumber is 0 μm and the circular or annular pattern is present within a region where an absolute value of wavenumber is within a range of 1 μm−1 or less, and said master block being obtained by a method comprising the steps of: forming a vapor-deposition film under a temperature condition of 70° C. or above on a surface of a polymer film made of a polymer whose volume changes by heat, and then cooling the polymer film and the vapor-deposition film, thereby forming concavities and convexities of wrinkles on a surface of the vapor-deposition film; and attaching a master block material onto the vapor-deposition film, then curing the master block material, and thereafter detaching the cured master block material from the vapor-deposition film, thereby obtaining a master block.