Patent ID: 7819716

Claim:
A manufacturing method of an organic electroluminescent element including pixel electrodes, cathode(s) and an organic luminescent medium layer including an organic luminescent layer and a hole transport layer, the method comprising: forming an insulator layer between pattern shaped pixel electrodes on a substrate, and forming a hole transport layer on the pixel electrodes between insulator layers by relief printing hole transport ink, wherein the hole transport ink on projection parts of a relief printing plate is printed on the substrate, wherein the hole transport ink consisting essentially of 3,4-polyethylen dihydroxy thiophen (PEDOT) solution, monohydric alcohol and dihydric alcohol, wherein a total of the weight fraction of the monohydric alcohol and the dihydric alcohol in the hole transport ink is 5%-50%, wherein the monohydric alcohol lowers surface tension of the hole transport ink and the dihydric alcohol retards drying of the hole transport ink and wherein a contact angle of the hole transport ink on the relief printing plate is 15-45 degrees.