Organic el display panel

A method of manufacturing an organic EL display panel, the method comprising:

• forming display elements on a substrate;
• sealing the display elements with a first sealing layer;
• covering the first sealing layer with a buffer layer;
• and
• covering the buffer layer with a second sealing layer, wherein
• the first sealing layer, the buffer layer, and the second sealing layer are each made of a silicon nitride film,
• forming of the silicon nitride film of the first sealing layer, the silicon nitride film of the buffer layer, and the silicon nitride film of the second sealing layer is performed through chemical vapor deposition using ammonia gas as a source material, and
• an ammonia gas flow amount set in forming the silicon nitride film of the buffer layer is greater than four times and smaller than twenty times an ammonia gas flow amount set in forming each of the silicon nitride film of the first sealing layer and the silicon nitride film of the second sealing layer.