An organic light-emitting display device and a method of manufacturing the same. The organic light-emitting display device includes: an active layer that is formed by patterning a semiconductor layer formed by laser crystallization; a gate electrode that is disposed to correspond to a channel area of the active layer; a first insulating layer that is disposed between the active layer and the gate electrode; a second insulating layer that is disposed on the gate electrode; and first test patterns that are formed on the second insulating layer and contact source and drain regions of the active layer and the gate electrode, respectively.