Patent ID: 7838347

Claim:
A method for manufacturing a display device comprising the steps of: forming a semiconductor layer; forming a gate insulating layer over the semiconductor layer; forming a gate electrode layer over the gate insulating layer; forming a source electrode layer and a drain electrode layer in contact with the semiconductor layer; forming a first electrode layer electrically connected to the source or drain electrode layer; forming an inorganic insulating layer over the gate electrode layer, the source electrode layer, the drain electrode layer and part of the first electrode layer; subjecting the inorganic insulating layer and the first electrode layer to plasma treatment so as to be nitrided or oxidized: wherein the plasma treatment under a nitrogen atmosphere or an oxygen atmosphere is performed with an electron density of 1×10 11 cm −3 to 1×10 13 cm −3 , and a plasma electron temperature of 0.5 eV to 1.5 eV; forming an electroluminescent layer over the inorganic insulating layer and the first electrode layer which are subjected to plasma treatment; and forming a second electrode layer over the electroluminescent layer.