Method of preparing organic electronic device

An organic electronic device comprising:

• a carrier substrate;
• a polymer layer formed on the carrier substrate and having a convex portion and a concave portion formed in a surface thereof;
• a flexible substrate coming in contact with the convex portion of the polymer layer;
• an organic electronic element formed on a top surface of the flexible substrate;
• and
• an inorganic layer formed between the flexible substrate and the organic electronic element,
• wherein the flexible substrate is a polymer film having a thickness from 10 to 50 μm,
• wherein an aspect ratio of the convex portion of the polymer layer is in a range of 10 to 150, and wherein a contact ratio between the polymer layer and the flexible substrate is in a range of 30% to 60%, based on the total area of the polymer layer,
• wherein the inorganic layer comprising a first sub-layer and a second sub-layer disposed on the first sub-layer,
• wherein the first sub-layer has a first refractive index and the second sub-layer has a second refractive index, and the first refractive index is smaller than the second refractive index.