Patent ID: 8728838

Claim:
A method for producing an organic electroluminescent display device in which a plurality of light-emitting cells each having an organic electroluminescent portion are arranged on a substrate, and, for each of said light-emitting cells, a first transistor which controls energization on said organic electroluminescent portion, and a second transistor which switches a signal to be given to an input of said first transistor are disposed, wherein said method comprises: a first step of forming an active layer of said first transistor and an active layer of said second transistor by an amorphous oxide semiconductor, on said substrate; and a second step of, after only said active layer of said first transistor is covered by a light-blocking mask, irradiating said active layer of said second transistor with ultraviolet ray or plasma to make an electron carrier concentration of said active layer of said second transistor higher than an electron carrier concentration of said active layer of said first transistor.