The driving voltage line PL may be covered by a second organic insulating layer 113. The second organic insulating layer 113 may include an imide-based polymer, a general-purpose polymer such as PMMA or PS, a polymer derivative having a phenol-based group, an acryl-based polymer, an aryl ether-based polymer, an amide-based polymer, a fluorine-based polymer, a p-xylene-based polymer, a vinyl alcohol-based polymer, and/or a blend thereof. In an embodiment, the second organic insulating layer 113 may include polyimide.

A pixel electrode 210 may be located on the second organic insulating layer 113. A pixel-defining film 120 may be located on the pixel electrode 210. The pixel-defining film 120 may have an opening that corresponds to each sub-pixel At least a central portion of the pixel electrode 210 may be exposed through the opening to define a pixel. The pixel-defining film 120 may increase a distance between an edge of the pixel electrode 210 and a common electrode 230, thereby preventing an arc or the like from occurring between the edge of the pixel electrode 210 and the common electrode 230. The pixel-defining film 120 may be formed of an organic material such as polyimide or hexamethyldisiloxane (HMDSO).