Patent ID: 8390015

Claim:
An organic electro-luminescence (EL) element, comprising: a substrate; and a light reflective layer, a first transparent electrode layer, an insulation layer, a hole transport layer, and a plurality of banks being stacked above the substrate; a luminous function layer above the hole transport layer in a recess defined by the plurality of banks; and a second transparent electrode layer above the luminous function layer, wherein the light reflective layer, the first transparent electrode layer, the insulation layer, and the hole transport layer are stacked above the substrate in a region isolated by the plurality of banks, the plurality of banks comprises a material that absorbs incident light of a predetermined wavelength during a process of forming the plurality of banks by exposing a photosensitive resin layer to the incident light, the process of forming the plurality of banks defining the recess for the luminous function layer, the first transparent electrode layer, the insulation layer, and the hole transport layer are part of an optical multilayer film, each having a reflectance value that is between a local minimum value and a neighborhood value of the local minimum value, the reflectance value being a ratio of reflection of the incident light that is reflected from the light reflective layer toward the photosensitive resin layer to the incident light that is directed from the photosensitive resin layer toward the light reflective layer during the process of forming the plurality of banks, and the predetermined wavelength is λ and satisfies: d 1=1 /n 1×4.0 a×λ/ 4; d 2=1 /n 2×1.0 a×λ/ 4; d 3=1 /n 3×7.0 a×λ/ 4; and d 4=1 /n 4×5.0 a×λ/ 4, wherein d 1 is a thickness of the first transparent electrode layer, d 2 is a thickness of the hole transport layer, d 3 is a thickness of the insulation layer, d 4 is a thickness of the plurality of banks above the hole transport layer, n 1 is a refractive index of the first transparent electrode layer, n 2 is a refractive index of the hole transport layer, n 3 is a refractive index of the insulation layer, n 4 is a refractive index of the photosensitive resin layer from which the plurality of banks is formed, and a is a predetermined constant.