Patent ID: 8841927

Claim:
A touch sensing circuit for sensing a coupling capacitance value changed by a touch on a touch screen panel and sensing whether a touch is made on the touch screen panel, wherein the touch screen panel comprises a plurality of driving electrodes and a plurality of receiving electrodes, wherein the plurality of driving electrodes comprise a first driving electrode and a second driving electrode, and wherein the plurality of receiving electrodes comprise a first receiving electrode and a second receiving electrode, the touch sensing circuit comprising: a first touch line configured to be driven by a first driving signal; a second touch line configured to be driven by a second driving signal, wherein the second touch line is adjacent to the first touch line; a differentiator comprising: a first differentiator configured to generate a first differentiated signal and output the first differentiated signal to an amplifier via the first touch line, wherein the first differentiator comprises a first coupling capacitance and a first differential resistance, wherein the first coupling capacitance is positioned on the first touch line between the first driving electrode and the first receiving electrode, and wherein the first differential resistance comprises a first terminal connected to the first touch line between the first receiving electrode and the amplifier; and a second differentiator configured to generate a second differentiated signal and output the second differentiated signal to the amplifier via the second touch line, wherein the second differentiator comprises a second coupling capacitance and a second differential resistance, wherein the second coupling capacitance is positioned on the second touch line between the second driving electrode and the second receiving electrode, and wherein the second differential resistance comprises a first terminal connected to the second touch line between the second receiving electrode and the amplifier, the amplifier configured to receive the first differentiated signal from the first differentiator via the first touch line, receive the second differentiated signal from the second differentiator via the second touch line, and output an amplified signal; and a detector configured to receive the amplified signal and output a detection signal.