Patent ID: 8445301

Claim:
A method of manufacturing a TFT substrate, the method comprising: forming a gate electrode on a substrate; forming a gate insulating layer on the gate electrode; forming an oxide semiconductor layer pattern on the gate insulating layer; forming an oxide semiconductor pattern and a pixel electrode pattern from the oxide semiconductor layer pattern; forming semiconductor protective film patterns over the oxide semiconductor pattern; forming a source electrode and a drain electrode on the semiconductor protective film patterns such that the semiconductor protective film patterns separate the oxide semiconductor pattern from the source and drain electrodes, wherein the drain electrode faces the source electrode; and performing a plasma-treatment process on the pixel electrode pattern causing the material of the pixel electrode pattern to change from semiconductive to conductive to form a pixel electrode, wherein the oxide semiconductor pattern is formed using a photosensitive film pattern as an etch mask and the source electrode and the drain electrode are formed using the same photosensitive film pattern used to form the oxide semiconductor pattern as an etch mask.