Patent ID: 8546799

Claim:
An organic light emitting display apparatus, comprising: a substrate; a lower active layer on the substrate, the lower active layer including an oxide semiconductor configured to generate current in response to light; an etching prevention layer on an upper portion of the lower active layer, the etching prevention layer including a contact hole; a source or drain electrode on the etching prevention layer, the source or drain electrode being electrically connected to the lower active layer through the contact hole; an upper charging electrode on the etching prevention layer, the upper charging layer overlapping the lower active layer; a light emitting layer contacting the upper charging electrode, the light emitting layer being configured to generate light; and a cathode electrode facing the upper charging electrode with the light emitting layer therebetween, the cathode electrode being configured to drive the light emitting layer in conjunction with the upper charging electrode, wherein: the light emitting layer is configured to be driven and emit light in response to a driving voltage applied to the upper charging electrode, and the lower active layer is configured to store current generated in the oxide semiconductor in response to the driving voltage applied to the upper charging electrode.