Patent ID: 8278158

Claim:
A method of manufacturing a thin film transistor substrate, comprising: forming a gate electrode on a substrate; forming a semiconductor pattern including a source area, a drain area, and a channel area on the gate electrode; forming a first etch stop layer on the semiconductor pattern; forming a second etch stop layer on the first etch stop layer; etching the second etch stop layer to form a second etch stop pattern that overlaps the channel area; patterning the first etch stop layer to form a first etch stop pattern that covers the channel area under the second etch stop pattern; and forming a source electrode and a drain electrode spaced apart from each other in the source area and the drain area, respectively, wherein the source electrode is in direct contact with a lateral sidewall of the source area and an upper surface of the source area and wherein the drain electrode is in direct contact with a lateral sidewall of the drain area and an upper surface of the drain area.