Capacitance detection method of touch display panel, capacitance detection circuit of touch display panel, and electronic device

A capacitance detection circuit of a touch display panel, comprising:

• a sync signal controller configured to receive a real-time sync signal sent from a display panel, and generate a trigger signal in a period in which a display driving noise is avoided based on the real-time sync signal;
• a driving signal generator configured to generate a sync driving signal in the period in which the display driving noise is avoided based on the received trigger signal, to drive a driving electrode of the touch display panel;
• a signal detection gate configured to detect a signal value of a capacitance sensor in the touch display panel in the period in which the display driving noise is avoided based on the received trigger signal;
• and
• a buffer storing a reference voltage and a differential circuit, wherein the signal detection gate is configured to gatedly connect the signal value of the capacitance sensor in the touch display panel to the buffer storing the reference voltage during a period of the display driving noise, the buffer is connected to an input terminal of the differential circuit, the reference voltage is inputted to another input terminal of the differential circuit, and an output terminal of the differential circuit is at a zero level.

A touch integrated chip comprising a capacitance detection circuit, wherein the capacitance detection circuit comprises:

• a sync signal controller configured to receive a real-time sync signal sent from a display panel, and generate a trigger signal in a period in which a display driving noise is avoided based on the real-time sync signal;
• a driving signal generator configured to generate a sync driving signal in the period in which the display driving noise is avoided based on the received trigger signal, to drive a driving electrode of the touch display panel;
• a signal detection gate configured to detect a signal value of a capacitance sensor in the touch display panel in the period in which the display driving noise is avoided based on the received trigger signal;
• and
• a buffer storing a reference voltage and a differential circuit, wherein the signal detection gate is configured to gatedly connect the signal value of the capacitance sensor in the touch display panel to the buffer storing the reference voltage during a period of the display driving noise, the buffer is connected to an input terminal of the differential circuit, the reference voltage is inputted to another input terminal of the differential circuit, and an output terminal of the differential circuit is at a zero level.