The air spraying is performed even after the second insulating layer 150 having a preset shape (pattern) is formed. At this time, because air is sprayed at high pressure, a portion of the second insulating layer 150 may be chipped off. When adhesion between the second insulating layer 150 including an organic material and the electrode power supply line VSS is weak, a part of an end of the second insulating layer 150 (the end directly contacting the electrode power supply line VSS) may be chipped off. When the air gun sprays air onto the substrate 100 in the direction of the resultant vector of the sum of the ?x direction vector and the ?z direction vector, a part of the second end EP2 of the second insulating layer 150 (the second end EP2 covering, by extending in a y direction, the second portion P2 of the electrode power supply line VSS) may be chipped off. This is because air is sprayed vertically onto the part of the second end EP2 of the second insulating layer 150 (the second end EP2 covering, by extending in a y direction, the second portion P2 of the electrode power supply line VSS). In this case, the part chipped off from the second insulating layer 150 may become a particle, and thus may remain in the display area DA. In this case, the particle may cause defects in a process of forming the pixel electrodes 311 and 321, the intermediate layers 313 and 323, and the opposite electrodes 315 and 325.