Patent ID: 7566596

Claim:
A method of manufacturing a thin film transistor substrate comprising: forming a gate line and a gate electrode on a substrate; forming a gate insulating layer and an active layer on the gate line and the gate electrode; forming an active pattern; forming a data line, a source electrode and a drain electrode on the substrate, the forming a data line, a source electrode and a drain electrode including depositing a data metal layer on the substrate on which the active pattern is formed and patterning the data metal layer; forming a protecting layer on the substrate to cover the data line, the source electrode and the drain electrode; forming a photoresist pattern and a pixel area on the substrate, the photoresist pattern being formed on the protecting layer; overetching the protecting layer using the photoresist pattern as a mask to form an undercut at a lower portion of the photoresist pattern; depositing a conductive material on the photoresist pattern and the pixel area to form a conductive layer and a pixel electrode on the substrate, the conductive layer being separated from the pixel electrode; applying a stripping composition onto the substrate to strip the photoresist pattern and/or remove the conductive layer formed on the photoresist pattern from the substrate; and collecting used stripping composition, the used stripping composition including the conductive layer removed from the substrate and completely dissolved in the used stripping composition.