An input sensor includes sensing electrodes, and multiplexers for connecting sensing electrodes corresponding to one group of the sensing electrodes to one output terminal. Each of the multiplexers includes a multiplexer circuit including a plurality of switching transistors, and a shift register array for outputting selection signals for controlling the plurality of switching transistors. Each of the switching transistors includes sub-switching transistors connected in parallel between one of the sensing electrodes corresponding to the one group and the output terminal. The sub-switching transistors are sequentially turned on in response to one of the selection signals.