A transistor may include an active layer including a first end area, a middle area adjacent to the first end area, and a second end area spaced from the first end area by the middle area, a first electrode on the active layer, overlapping the first end area, and connected to the first end area through a first contact hole, an upper gate electrode on the active layer, overlapping the middle area, at a same layer as the first electrode, and to receive a gate signal and a lower gate electrode under the active layer, overlapping the first contact hole and the middle area, and to receive the gate signal.