Patent ID: 8890836

Claim:
A detection device, comprising: a sensor unit in which detection electrodes are positioned in a detection surface; a selection unit that selects one or more of the detection electrodes; an oscillation unit in which an oscillation frequency is determined by a capacitance generated in the one or more detection electrodes selected by the selection unit; a conversion unit that outputs a signal corresponding to the frequency of a signal from the oscillation unit; and a switch unit that performs an electrical connection/disconnection between a wiring for connecting the oscillation unit and the selection unit and a constant voltage line, wherein the oscillation unit changes a state between being enabled and disabled, the detection device further comprises a control unit that disables and enables the oscillation unit and controls the switch unit while the selection unit selects the one or more detection electrodes, and connects the one or more detection electrodes selected by the selection unit to the constant voltage line, and while the selection unit selects the one or more detection electrodes, the control unit disables the oscillation unit and connects the one or more detection electrodes selected by the selection unit to the constant voltage line by controlling the switch unit to discharge charges accumulated in the one or more detection electrodes selected by the selection unit immediately before enabling the oscillation unit, and after the discharging, the control unit disconnects the one or more detection electrodes selected by the selection unit from the constant voltage line by controlling the switch unit, and enables the oscillation unit.