Patent ID: 7166501

Claim:
A method for fabricating a thin film transistor in a liquid crystal display (LCD) device, comprising: forming a polysilicon layer on a substrate; forming a gate insulating layer on the polysilicon layer; forming a metal layer on the gate insulating layer; forming a first photoresist pattern on the metal layer; patterning the metal layer into a gate electrode using the first photoresist pattern as a mask; patterning the polysilicon layer and the gate insulating layer to form an active layer; removing a portion of the first photoresist pattern thereby forming a second photoresist pattern; firstly implanting impurity ions into the active layer using the second photoresist pattern as a mask; removing a portion of the gate insulating layer formed on the active layer after said firstly implanting impurity ions into the active layer; secondly implanting impurity ions at a high concentration into the active layer exposed by removing the gate insulating layer; forming a source/drain electrode on a portion of the active layer implanted with the high concentration of impurity ions; and forming a pixel electrode electrically contacting the drain electrode.