Apparatus and Method for Detecting Touch

摘要

One embodiment of the present invention provides an apparatus for detecting a touch, the apparatus comprising: a sensor pad for forming touch capacitance in relation to a touch input tool; an operation amplifier for outputting different signals according to whether there is a touch on the sensor pad, the operation amplifier having a first input end connected to the sensor pad and a second input end receiving a reference voltage; a first switch for controlling potentials of both ends of driving capacitance connected between the first input end and an output end of the operation amplifier; a second switch for switching a connection between the sensor pad and the first input end, the second switch being turned on and off alternately with the first switch; and a parasitic capacitance compensation circuit for supplying an electric charge to at least one of the touch capacitance and parasitic capacitance that shares a charge amount of the touch capacitance when the second switch is in an on state.

主权项

1. An apparatus for detecting touch, comprising:
a sensor pad for forming touch capacitance in relation to a touch input tool; an operation amplifier for outputting different signals according to whether there is touch on the sensor pad, the operation amplifier having a first input end connected to the sensor pad and a second input end receiving a reference voltage; a first switch for controlling potential of both ends of driving capacitance connected between the first input end and an output end of the operation amplifier; a second switch for switching a connection between the sensor pad and the first input end, the second switch being turned on and off alternately with the first switch; and a parasitic capacitance compensation circuit for supplying an electric charge to at least one of the touch capacitance and parasitic capacitance that shares the amount of charge of the touch capacitance when the second switch is in an on state.