Abstract: A thin film transistor includes an active layer located over a substrate, a first gate stack including a stack of a first gate dielectric and a first gate electrode and located on a first surface of the active layer, a pair of first contact electrodes contacting peripheral portions of the first surface of the active layer and laterally spaced from each other along a first horizontal direction by the first gate electrode, a second contact electrode contacting a second surface of the active layer that is vertically spaced from the first surface of the active layer, and a pair of second gate stacks including a respective stack of a second gate dielectric and a second gate electrode and located on a respective peripheral portion of a second surface of the active layer.

Abstract: A touch input device includes a touch screen, a scan controlling unit and a UI control unit. The UI control unit is configured for identifying one or more effective touch regions according to a user interface displayed on the touch screen, and transmitting a region identifying signal to the scan controlling unit. The scan controlling unit is configured for determining one or more scan regions corresponding to the effective touch regions according to the region identifying signal, and activating a scan over the scan regions. A power saving method for the touch input device is also provided.