A method of manufacturing an organic light-emitting display device, the method comprising steps of:
- performing a first mask process for forming an active layer of a thin-film transistor and a lower electrode of a capacitor;
- forming a first insulating layer and a nano-Ag thin-film including nano-Ag particles on the active layer and the lower electrode;
- performing a second mask process for forming a gate electrode of the thin-film transistor, for forming a first electrode pattern to form a pixel electrode, for forming a second electrode pattern to form an upper electrode of the capacitor, and for forming a third electrode pattern to form a pad electrode in a pad area on the first insulating layer, the gate electrode including a first electrode formed on the first insulating layer and a second electrode formed on the first electrode, the first electrode including a transparent conductive material and the nano-Ag thin-film including the nano-Ag particles;
- performing a third mask process for forming an interlayer insulating layer having openings which expose edges of the active layer, the first electrode pattern, the second electrode pattern, and the third electrode pattern;
- performing a fourth mask process for forming a source electrode and a drain electrode, each of the source electrode and the drain electrode contacting the active layer, one of the source electrode and the drain electrode contacting the pixel electrode;
- and
- performing a fifth mask process for forming a pixel defining film which exposes the pixel electrode, the organic light-emitting display device comprising the thin-film transistor, the organic light-emitting device and the pad electrode formed on an edge region of the organic light-emitting display device, the thin-film transistor comprising the active layer, the first insulating layer formed on the active layer, the gate electrode formed on the first insulating layer, the source electrode connected to the active layer, and the drain electrode connected to the active layer, wherein the organic light-emitting device comprises the pixel electrode which is electrically connected to the thin-film transistor and is formed at a same layer as the first electrode, an intermediate layer which includes an emissive layer, and an opposite electrode which covers the intermediate layer and faces the pixel electrode, a material of the pixel electrode being the same as a material of the first electrode, the pad electrode formed at the same layer as the first electrode, a material of the pad electrode being the same as the material of the first electrode.