Integration circuit, touch interaction sensing apparatus, and touchscreen apparatus

A touchscreen apparatus comprising:

• a panel unit including a plurality of first electrodes extended in a first direction and a plurality of second electrodes extended in a second direction intersecting with the first direction;
• a driving circuit unit configured to apply driving signals to the plurality of first electrodes;
• and
• a sensing circuit unit connected to the plurality of second electrodes and configured to detect capacitance formed at intersection points between the plurality of first electrodes and the plurality of second electrodes,
• wherein the sensing circuit unit includes:
• a plurality of integration circuits each connected to one of the plurality of second electrodes, each of the plurality of integration circuits including a plurality of switches,
• at least one operational amplifier, and
• at least one feedback capacitor and configured to integrate capacitance,
• wherein the operational amplifier is configured to be synchronized with a clock signal applied to at least one of the plurality of switches to be operated in each of a normal mode and a low power mode in a same period of the clock signal, and
• wherein the operational amplifier consumes less power in the low power mode than in the normal mode by adjusting an amount of current flowing to at least one transistor included in the operational amplifier.