Patent ID: 8853686

Claim:
A method of fabricating a flat panel display device with an oxide thin film transistor, the method comprising: preparing a substrate defined into a pixel region and a pad contact region; forming a gate electrode and a link line in the pixel region and the pad contact region of the substrate; sequentially forming a gate insulation film and a first transparent conductive material film on the substrate provided with the gate electrode and performing a first mask procedure for the first transparent conductive material film to form a pixel electrode within the pixel region; forming an oxide layer on the substrate provided with the pixel electrode and performing a second mask procedure for the oxide layer to form a channel layer on the gate insulation film opposite to the gate electrode; forming an insulation layer on the substrate provided with the channel layer and performing a third mask procedure for the insulation layer to form an etch stopper, which is disposed on a central region of an upper surface of the channel layer, and an auxiliary etch stopper disposed on the gate insulation film of the pad contact region which will be occupied by a data line; forming a metal film on the entire surface of the substrate after the etch stopper is formed on the substrate and performing a fourth mask procedure for the metal film to form source and drain electrodes and the data line, which has one end overlapping with the auxiliary etch stopper within the pad contact region, wherein the source and drain electrodes are contacted with the etch stopper, the channel layer and the gate insulation film; forming a passivation layer on the substrate provided with the source and drain electrodes and performing a formation process of contact holes to expose the link line and the data line opposite to the auxiliary etch stopper; and forming a second transparent conductive material film on the substrate with the contact holes and performing a fifth mask procedure to form a common electrode, which is disposed within the pixel region, and a connection electrode which is disposed within the pad contact region and connects the data line with the link line.