An organic light-emitting display apparatus is disclosed. In one aspect, the apparatus includes a thin film transistor comprising an active layer, a gate electrode, and source and drain electrodes. The apparatus also includes at least two capacitors each comprising a first electrode having a first region doped with ion impurities and a second region not doped with ion impurities, and formed on the same plane as the active layer. Each capacitor also includes a second electrode formed on the same plane as the gate electrode and disposed corresponding to the second region. The apparatus also includes a pixel electrode formed on the same plane as the gate electrode and connected to one of the source and drain electrodes, a light-emitting layer disposed on the pixel electrode, and an opposite electrode disposed on the light-emitting layer.