Patent ID: 8519386

Claim:
An organic light emitting device comprising: a first signal line and a second signal line intersecting the first signal line, the first signal line and the second signal line disposed on an insulating substrate; a switching thin film transistor electrically connected to the first signal line and the second signal line; a driving thin film transistor electrically connected to the switching thin film transistor; and a light emitting diode electrically connected to the driving thin film transistor, wherein the driving thin film transistor comprises a driving control electrode, a driving semiconductor overlapping the driving control electrode, a driving gate insulating layer disposed between the driving control electrode and the driving semiconductor, wherein the driving gate insulating layer consists of silicon oxide, and a driving input electrode and a driving output electrode opposed to the driving input electrode, the driving input electrode and the driving output electrode disposed on the driving semiconductor, wherein an interface between the driving gate insulating layer and the driving semiconductor comprises nitrogen, and wherein a concentration of nitrogen in the interface between the driving gate insulating layer and the driving semiconductor is between about 0.06 atomic percent to about 4.75 atomic percent, based on a total composition of the driving gate insulating layer, wherein the driving semiconductor comprises crystallized silicon having doped regions and a non-doped region, wherein the doped regions are disposed on both sides of the non-doped region, and wherein a switching gate insulating layer directly contacts with the non-doped region.