Patent ID: 7759180

Claim:
A method of manufacturing a display substrate, the method comprising: forming a gate electrode on a substrate; forming a gate insulating layer on the substrate to cover the gate electrode; sequentially forming first and second conductive layers on the gate insulating layer to form a source-drain layer; forming a first insulating layer pattern on the source-drain layer; patterning the source-drain layer by using the first insulating layer pattern and a second insulating layer pattern, which is formed by primarily etching the first insulating layer pattern, as etch masks to form a preliminary source-drain layer; secondarily etching the second insulating layer pattern to form a third insulating layer pattern; performing a surface treatment relative to the substrate; patterning the preliminary source-drain layer to form a source electrode and a drain electrode, which are spaced apart from each other; forming an organic semiconductor layer on the source and drain electrodes; and forming a pixel electrode on the substrate wherein the pixel electrode is electrically connected to the drain electrode.