Patent ID: 7790523

Claim:
A method of manufacturing a thin film transistor substrate, comprising: forming a gate insulating layer, an active layer, a data metal layer and a photoresist film on a base substrate having a gate electrode to cover the gate electrode; exposing the photoresist film using a mask to form a photoresist pattern having a channel groove, wherein the mask includes: a drain mask pattern, a source mask pattern spaced apart from the drain mask pattern and having a first side surface facing the drain mask pattern, and a light-adjusting pattern interposed between two end portions of the source mask pattern and the drain mask pattern to prevent light from entering a channel region between the drain and source mask patterns from a transparent region surrounding the drain mask pattern, the source mask pattern and the channel region; partially etching the data metal layer and the active layer using the photoresist pattern as an etching mask to form a data metal pattern and an active pattern; decreasing a thickness of the photoresist pattern so that the data metal pattern is exposed through the channel groove; and partially etching the data metal pattern through the channel groove to form a data line having a source electrode and a drain electrode.