Patent ID: 7524728
Filing Date: 2009-04-28
Classification: H01L

Abstract:
1. A method of manufacturing a thin film transistor, comprising: depositing an amorphous silicon film on a substrate; performing a laser irradiation to the amorphous silicon film so the amorphous film is melted and crystallized to form a polysilicon film; etching the polysilicon film to form a predetermined pattern; implanting impurities in the polysilicon film; forming a gate insulation film on the polysilicon film; forming a gate electrode on the gate insulation film; forming a source region and a drain region in the polysilicon film; and configuring the thin film transistor to operate as a pixel driving transistor of an organic electroluminescent element, wherein the implanting of the impurities comprises implanting impurities of a p-type and impurities of an n-type into part of the polysilicon film to be used as a channel region of the driving transistor, and the implanting of the p-type impurity comprises implanting a dose of boron from 1×10