Patent ID: 8895986

Claim:
A thin film transistor (TFT) flat sensor comprising a plurality of pixel units each comprising: a common electrode and a common electrode insulating layer on a substrate, wherein a first via hole is formed in the common electrode insulating layer at a location corresponding to the common electrode; a gate electrode on the common electrode insulating layer; a first conductive film layer on the common electrode and the gate electrode and acting as one polar plate of a storage capacitor, wherein the first conductive film layer contact the common electrode through the first via hole; a gate insulating layer, an active layer, a drain electrode and a source electrode, a second conductive film layer acting as another polar plate of the storage capacitor, a protection layer, and a third conductive film layer for collecting carriers on the first conductive film layer, wherein the second conductive film layer is between the source electrode and the active layer, a second via hole is formed in the protection layer at a location corresponding to the source electrode, and the third conductive film layer contacts the source electrode via the second via hole.