A fabrication method of a TFT includes successively forming four thin films containing a first conductive layer, an insulation layer, a semiconductor layer, and a second conductive layer on a substrate, performing a first PEP process to pattern the four thin films for forming a semiconductor island and a gate electrode with the semiconductor layer and the first conductive layer respectively. Then, a laser ablation process is performed to define a channel pattern in the four thin films and remove a portion of the second conductive layer so that unconnected source electrode and drain electrode are formed with the second conductive layer.

 
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