Back panel for flat panel display apparatus, flat panel display apparatus comprising the same, and method of manufacturing the back panel

A back panel for a flat panel display apparatus, the back panel comprising:

• a pixel electrode disposed on a substrate and comprising a transparent conductive oxide;
• a thin-film transistor (TFT) gate electrode comprising a first gate electrode layer disposed on the same layer as the pixel electrode and comprising the same type of material as the pixel electrode, a second gate electrode layer disposed on the first gate electrode layer and comprising a semiconductor material, and a third gate electrode layer disposed on the second gate electrode layer and comprising a metal;
• a first insulating layer disposed on the third gate electrode layer;
• an active layer disposed on the first insulating layer;
• a second insulating layer disposed on the active layer;
• a first TFT electrode and a second TFT electrode disposed on the second insulating layer and connected to the active layer through the second insulating layer;
• and
• a third insulating layer disposed on the first TFT electrode and the second TFT electrode,
• wherein the first TFT electrode is electrically connected to the pixel electrode.