Patent ID: 8878181

Claim:
An oxide thin film transistor (TFT) comprising: a gate electrode on a substrate; a gate insulating layer on the substrate with the gate electrode formed thereon; an active layer made of oxide semiconductor on the gate insulating layer; a contact layer on the substrate with the active layer formed thereon, wherein some region of the contact layer is etched to expose a back channel region of the active layer and wherein thickness of the exposed back channel region of the active layer is less than that of source and drain regions of the active layer; source and drain electrodes on the substrate with the contact layer formed thereon and electrically connected with the source and drain regions of the active layer; a protective layer on the substrate with the source and drain electrodes thereon; a contact hole formed by removing the protective layer to expose the drain electrode; and a pixel electrode electrically connected with the drain electrode through the contact hole.