Touch sensing method with noise reduction

A touch sensing method for a touch panel, wherein the touch panel includes a plurality of touch sensitive cells for which a touch sensing is to be performed by a plurality of touch sensing circuits, and the touch sensing method comprises:

• determining at least one touch sensing circuit of the plurality of touch sensing circuits as a first number of to-sense touch sensing circuits, and determining at least one touch sensing circuit of the plurality of touch sensing circuits as a second number of reference touch sensing circuits, wherein each touch sensing circuit has a corresponding touch sensitive cell among the plurality of touch sensitive cells, and each to-sense touch sensing circuit has a corresponding reference touch sensing circuit;
• causing a first terminal of each to-sense touch sensing circuit to receive a touch excitation signal (TX1), and a second terminal thereof to apply the touch excitation signal (TX1) to a corresponding touch sensitive cell and receive a touch sensing signal from the corresponding touch sensitive cell, and an output terminal thereof to output a first output signal;
• causing a first terminal of each reference touch sensing circuit to receive a touch reference signal (DC/TX2), and a second terminal thereof to apply the touch reference signal (DC/TX2) to a corresponding touch sensitive cell and receive a reference sensing signal from the corresponding touch sensitive cell, and an output terminal thereof to output a second output signal, wherein the touch reference signal (DC/TX2) and the touch excitation signal (TX1) are different signals;
• and
• obtaining, according to a first number of first output signals and a second number of second output signals, a capacitance difference of capacitances sensed by each to-sense touch sensing circuit and its corresponding reference touch sensing circuit,
• wherein, the obtaining, according to the first number of first output signals and the second number of second output signals, a capacitance difference of capacitances sensed by each to-sense touch sensing circuit and its corresponding reference touch sensing circuit, comprises:
• for each to-sense touch sensing circuit,
• performing subtraction on a first output signal output by the to-sense touch sensing circuit and a second output signal output by its corresponding reference touch sensing circuit, to obtain a differential signal;
• and
• obtaining, based on the differential signal, a capacitance difference of capacitances sensed by the to-sense touch sensing circuit and its corresponding reference touch sensing circuit,
• and wherein, performing subtraction on a first output signal output by the to-sense touch sensing circuit and a second output signal output by its corresponding reference touch sensing circuit, to obtain a differential signal, comprises:
• multiplying the second output signal output by the corresponding reference touch sensing circuit by a preset coefficient, wherein the preset coefficient is related to an area ratio between areas of contact pads of touch electrodes of touch sensitive cells respectively corresponding to the to-sense touch sensing circuit and the corresponding reference touch sensing circuit;
• and
• performing subtraction on the first output signal and the second output signal multiplied by the preset coefficient, to obtain the differential signal.