Patent ID: 8228266

Claim:
An organic electroluminescent device comprising: a gate line and a data line crossing each other to define a pixel region; a power line crossing the gate line and arranged parallel to the data line; a switching transistor connected to the gate line and the data line; a driving transistor connected to the gate line and the power line; and a pixel electrode formed in the pixel region, wherein each of the switching transistor and the driving transistor includes: a gate electrode formed under a channel layer, source and drain electrodes on and directly contacting the channel layer, an interlayer insulating layer on and in direct contact with the channel layer and only in an area between the source and drain electrodes and a stopper on and in contact with the interlayer insulating layer, and wherein the interlayer insulating layer and the stopper are spaced apart from the source and drain electrodes, respectively, between the source electrode and the drain electrode.