Patent ID: 8013325

Claim:
An organic light emitting device comprising: a substrate; a driving transistor comprising: a first control electrode formed on the substrate; an insulating layer formed on the first control electrode and the substrate; a first electrode and a second electrode spaced apart from each other with respect to the first control electrode and formed on the insulating layer; a first ohmic contact layer and a second ohmic contact layer formed on the first electrode and the second electrode; and a first semiconductor layer formed on the first ohmic contact layer and the second ohmic contact layer to fill the first electrode and the second electrode; a pixel electrode connected to the second electrode; an organic light emitting member formed on the pixel electrode; a counter electrode formed on the organic light emitting member; and a switching transistor electrically connected to the first control electrode, wherein the switching transistor comprises: a second control electrode connected to a gate line, a second semiconductor layer formed in the area corresponding to the second control electrode; a third electrode connected to a data line and a fourth electrode electrically connected to the second semiconductor layer; a third ohmic contact layer formed between the third electrode and the second semiconductor layer; and a fourth ohmic contact layer formed between the fourth electrode and the second semiconductor layer.