Patent ID: 7638375

Claim:
A method of manufacturing a thin film transistor (TFT) substrate, comprising: sequentially forming a transparent conductive layer and an opaque conductive layer on a substrate; patterning the transparent conductive layer and the opaque conductive layer using a first mask to form a gate pattern including a pixel electrode; forming a gate insulating layer and a semiconductor layer above the substrate; forming a contact hole which exposes a portion of the pixel electrode and a semiconductor pattern using a second mask; forming a conductive layer above the substrate; and patterning the conductive layer to form a source/drain pattern including a drain electrode which overlaps a portion of the pixel electrode, and removing portions of the gate insulating layer and the opaque conductive layer above the pixel electrode except a portion overlapping the drain electrode, by using a third mask, wherein the second mask is a slit mask, and wherein the forming the contact hole and the semiconductor pattern comprises: forming a first photoresist pattern on the semiconductor layer, the first photoresist pattern exposing a region where the contact hole is to be formed on the semiconductor layer; forming the contact hole using the first photoresist pattern; modifying the first photoresist pattern to form a second photoresist pattern which exposes a region except a region where the semiconductor pattern is to be formed; etching the semiconductor layer by using the second photoresist pattern to form the semiconductor pattern; and removing the second photoresist pattern.