Patent ID: 7304639

Claim:
An organic electroluminescent display device, comprising: a substrate; a gate line on the substrate; a data line crossing the gate line over the substrate; a switching thin film transistor near the crossing of the gate line and data line; a driving thin film transistor system including a plurality of sub-TFTs connected in parallel to the switching thin film transistor via a gate base; a power line crossing the gate line over the substrate and electrically connected with the plurality of sub-TFTs; a first electrode over the driving thin film transistor system in contact with the plurality of sub-TFTs; an organic electroluminescent layer on the first electrode; and a second electrode of transparent material on the organic electroluminescent layer, wherein the driving thin film transistor system includes first to fourth sub-TFTs having first to fourth driving gate electrodes, first to fourth driving source electrodes, first to fourth driving drain electrodes, and first to fourth active layers, and wherein the third driving drain electrode and the fourth driving drain electrode include one united body.