| 摘要 |
<p>A touch detection apparatus according to the present disclosure comprises: a sensor pad for outputting a signal according to a touch state in response to the alternating voltage at a floating state after charging with an electric charge; an additional electrostatic capacitive unit electrically connected to an output terminal of the sensor pad and having a capacitance corresponding to the parasitic capacitance of the sensor pad; an electrical charging/discharging unit for charging or discharging the additional electrostatic capacitive unit in such a manner that the additional electrostatic capacitive unit has an electric charge variation the same as that in the parasitic capacitance caused by the alternation of the alternating voltage but an opposite polarity; and a level shift detection unit for acquiring a touch signal based on the difference between the voltage variation in the sensor pad caused by the alternating voltage when no touch occurs and the voltage variation in the sensor pad caused by the alternating voltage when a touch occurs.</p> |
