TOUCH SENSING DEVICE

摘要

A touch sensing device for measuring a contact position of an object by measuring a change in capacitance caused by contact of an object is provided. The touch sensing device includes a touch screen panel on which channel electrodes functioning as a transmission antenna or a reception antenna are disposed to form a plurality of electrode patterns, a transmission circuit connected to the channel electrodes to apply an electrical signal to the touch screen panel, a reception circuit connected to the channel electrodes to sense a varying capacitance from the plurality of electrode patterns, and a controller configured to control the touch screen panel, the transmission circuit and the reception circuit.

主权项

1. A touch sensing device for measuring a contact position of an object by measuring a change in capacitance caused by contact of an object, the touch sensing device comprising:
a touch screen panel on which channel electrodes functioning as a transmission antenna or a reception antenna are disposed to form a plurality of electrode patterns; a transmission circuit connected to the channel electrodes and configured to apply an electrical signal to the touch screen panel; a reception circuit connected to the channel electrodes and configured to sense a varying capacitance from the plurality of electrode patterns; and a controller configured to control the touch screen panel, the transmission circuit and the reception circuit, wherein the reception circuit includes a demodulation circuit, wherein the demodulation circuit includes an operational amplifier and a plurality of feedback capacitors electrically connected to the operational amplifier, and wherein charges relating to signals having different parity properties are controlled by the controller so as to be accumulated in each of a first group capacitor and a second group capacitor among the plurality of feedback capacitors.