Patent ID: 7785992

Claim:
A method for forming an array substrate for a display device comprising the steps of: forming a gate electrode on an insulating substrate; forming a gate insulating film on an entire surface of the insulating substrate including the gate electrode; forming an amorphous silicon layer and a refractory metal layer on the gate insulating film in succession; directing a laser beam to an entire surface of the refractory metal layer to crystallize the amorphous silicon layer into a polysilicon layer; removing the refractory metal layer and forming an ohmic contact layer and a metal film in succession; forming a source electrode, a drain electrode, and an active layer by removing the metal film, the ohmic contact layer, and the polysilicon layer selectively at the same time; forming an interlayer insulating film on an entire surface of the insulating substrate; removing the interlayer insulating film selectively to expose a predetermined portion of the surface of the drain electrode, to form a contact hole; and forming a pixel electrode electrically connected to the drain electrode through the contact hole.