A thin-film transistor array substrate, an organic light-emitting display having the same, and a method of manufacturing the organic light-emitting display are disclosed. In one embodiment, the thin-film transistor array substrate includes a buffer layer formed on a substrate, a first insulating layer formed on the buffer layer, a pixel electrode formed on the first insulating layer using a transparent conductive material, an intermediate layer that covers an upper side and outer side-surfaces of the pixel electrode and includes a organic light-emitting layer, a gap formed by etching the first insulating layer and the buffer layer at a peripheral of the pixel electrode, and a facing electrode that is formed on an upper side and outer side-surfaces of the pixel electrode to cover the intermediate layer and the gap.