Patent ID: 7928971

Claim:
A method of fabricating an organic electroluminescent display device including pixels each having a pixel region, a switching region and a driving region, the method comprising: forming a first metal layer on a first substrate; patterning the first metal layer to form a gate line, a switching gate electrode in the switching region, a gate base in the pixel region, and plural driving gate electrodes in the driving region; forming a first insulating layer on the first substrate to cover the gate line, the switching gate electrode, the gate base and the plural gate electrodes; forming a switching active layer on the first insulating layer over the switching gate electrode and plural driving active layers on the first insulating layer over the plural driving gate electrodes; forming a second metal layer over the switching and driving active layers; patterning the second metal layer to form a switching source, a switching drain electrode, plural driving source electrodes, and plural driving drain electrodes, thereby forming a switching thin film transistor and a driving thin film transistor system, wherein the driving thin film transistor system includes a plurality of sub-TFTs each having a corresponding driving gate electrode, a corresponding driving active layer, a corresponding driving source electrode, and a corresponding driving drain electrode; forming a second insulating layer over the switching source and drain electrodes and the plural driving drain electrodes, wherein the second insulating layer has source contact holes the expose portions of the plural driving source electrodes; forming a power line on the second insulating layer, the power line defining the pixel region with the gate and data lines and electrically communicating with the plural driving source electrodes through the source contact holes; forming a third insulating layer on the second insulating layer on the second insulating layer to cover the power line, the third insulating layer having drain contact holes exposing the plural driving drain electrodes; forming a connection pattern on the third insulating layer within the pixel region, the connection pattern contacting the plural driving drain electrodes via the drain contact holes; and forming an organic electroluminescent diode on a second substrate, the connection pattern electrically connecting the driving thin film transistor system to the organic electroluminescent diode.