An organic electroluminescent display (ELD) device having a first substrate having
an array element layer and a second substrate having an organic electroluminescent
diode includes a gate line formed on the first substrate, a data line formed on
the first substrate, a power supply line spaced apart from the data line and formed
on the first substrate, the power supply line being formed with same material as
the gate line in a same process as the gate line, a switching thin film transistor
having a semiconductor layer formed of amorphous silicon, a driving thin film transistor
formed near a crossing portion of the switching thin film transistor and the power
supply line, a connecting electrode connected to the driving thin film transistor
and an electrical connecting pattern for electrically connecting the connecting
electrode to the organic electroluminescent diode.