Patent ID: 8455876

Claim:
An organic light emitting diode display, comprising: a substrate main body; a first gate electrode and a second semiconductor layer on the substrate main body; a gate insulating layer on the first gate electrode and the second semiconductor layer; a first semiconductor layer and a second gate electrode on the gate insulating layer, the first semiconductor layer overlying the first gate electrode and the second gate electrode overlying the second semiconductor layer; a plurality of etching stopper layers, the plurality of etching stopper layers contacting portions of the first semiconductor layer; an interlayer insulating layer on the first semiconductor layer and the second gate electrode, the interlayer insulating layer including a plurality of contact holes exposing the plurality of etching stopper layers, respectively; a first source electrode and a first drain electrode on the interlayer insulating layer and the contact holes, the first source electrode and the first drain electrode being indirectly connected to the first semiconductor layer via the plurality of etching stopper layers or directly connected to the first semiconductor layer; and a second source electrode and a second drain electrode on the interlayer insulating layer, the second source electrode and the second drain electrode being connected to the second semiconductor layer.