Abstract: A touch detection method, a touch detection circuit, a touch chip and an electronic device. The touch detection method includes: receiving a real-time synchronization signal sent by a touch display panel; acquiring a frequency of a noise signal in a working environment of a touch chip; setting a frequency of a coding drive signal based on the frequency of the noise signal, generating the coding drive signal based on the frequency of the coding drive signal, and outputting the coding drive signal to a drive electrode of the touch display panel; generating a strobe signal based on the real-time synchronization signal; and receiving a signal of a sensing electrode of the touch display panel, and outputting a detection result based on the strobe signal and the signal of the sensing electrode.

Abstract: Provided are a detection circuit of a bridge sensor, a chip and a detection system. The detection circuit includes: an alternating current excitation module, and further includes a signal conditioning module, an analog-to-digital conversion module and a processing module connected in sequence. The alternating current excitation module is configured to apply an alternating current excitation signal to the bridge sensor. The signal conditioning module and the analog-to-digital conversion module are configured to sequentially process an output signal of the bridge sensor. The processing module is configured to demodulate the processed output signal and obtain detection information of the bridge sensor according to the demodulated output signal. In embodiments of the present disclosure, a white noise of the system can be greatly suppressed, and a signal-to-noise ratio of the system is improved, thereby improving detection performance of the bridge sensor.

Abstract: The present application provides a capacitance detection circuit, which could reduce the influence of screen noise on capacitance detection. The capacitance detection circuit includes: an amplification circuit connected to the capacitor to be detected, and configured to convert a capacitance signal of the capacitor to be detected into a voltage signal, the voltage signal being associated with the capacitance of the capacitor to be detected; and a control circuit connected to the amplification circuit, and configured to control an amplification factor of the amplification circuit to be a first amplification factor in a first period, and to control the amplification factor of the amplification circuit to be a second amplification factor in a second period, where noise generated by the screen in the first period is less than noise generated by the screen in the second period, and the first amplification factor is greater than the second amplification factor.

Abstract: A touch detection method, a touch detection circuit, a touch chip and an electronic device. The touch detection method includes: receiving a real-time synchronization signal sent by a touch display panel; acquiring a frequency of a noise signal in a working environment of a touch chip; setting a frequency of a coding drive signal based on the frequency of the noise signal, generating the coding drive signal based on the frequency of the coding drive signal, and outputting the coding drive signal to a drive electrode of the touch display panel; generating a strobe signal based on the real-time synchronization signal; and receiving a signal of a sensing electrode of the touch display panel, and outputting a detection result based on the strobe signal and the signal of the sensing electrode.

Abstract: A capacitance detection method of a touch display panel, a capacitance detection circuit, and an electronic device are provided. The method includes: receiving a real-time sync signal sent from a display panel, and generating a trigger signal in a period in which a display driving noise is avoided based on the real-time sync signal (S1); generating 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 (S2); and detecting 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 (S3). This method is little affected by the display driving operation, and improves the signal-to-noise ratio (SNR) of a finally detected effective signal, thus greatly improving the touch sensitivity.

Abstract: The present application provides a capacitance detection circuit, which could reduce the influence of screen noise on capacitance detection. The capacitance detection circuit includes: an amplification circuit connected to the capacitor to be detected, and configured to convert a capacitance signal of the capacitor to be detected into a voltage signal, the voltage signal being associated with the capacitance of the capacitor to be detected; and a control circuit connected to the amplification circuit, and configured to control an amplification factor of the amplification circuit to be a first amplification factor in a first period, and to control the amplification factor of the amplification circuit to be a second amplification factor in a second period, where noise generated by the screen in the first period is less than noise generated by the screen in the second period, and the first amplification factor is greater than the second amplification factor.

Abstract: Provided are a detection circuit of a bridge sensor, a chip and a detection system. The detection circuit includes: an alternating current excitation module, and further includes a signal conditioning module, an analog-to-digital conversion module and a processing module connected in sequence. The alternating current excitation module is configured to apply an alternating current excitation signal to the bridge sensor. The signal conditioning module and the analog-to-digital conversion module are configured to sequentially process an output signal of the bridge sensor. The processing module is configured to demodulate the processed output signal and obtain detection information of the bridge sensor according to the demodulated output signal. In embodiments of the present disclosure, a white noise of the system can be greatly suppressed, and a signal-to-noise ratio of the system is improved, thereby improving detection performance of the bridge sensor.

Abstract: A capacitance detection method of a touch display panel, a capacitance detection circuit, and an electronic device are provided. The method includes: receiving a real-time sync signal sent from a display panel, and generating a trigger signal in a period in which a display driving noise is avoided based on the real-time sync signal (S1); generating 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 (S2); and detecting 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 (S3). This method is little affected by the display driving operation, and improves the signal-to-noise ratio (SNR) of a finally detected effective signal, thus greatly improving the touch sensitivity.

Abstract: The present disclosure provides a capacitance detection circuit, which includes a front end circuit and a processing circuit; where the front end circuit comprises a first driving circuit, a first cancel circuit and a PGA circuit, the first driving circuit, the first cancel circuit and the PGA circuit are connected to a first end of a detection capacitor, a second end of the detection capacitor is grounded, and the processing circuit is connected to an output end of the front end circuit, and configured to determine a capacitance variation of a capacitance of the detection capacitor with respect to the base capacitance according to a voltage signal output by the front end circuit.

Abstract: The present disclosure provides a capacitance detection circuit, which includes a front end circuit and a processing circuit; where the front end circuit comprises a first driving circuit, a first cancel circuit and a PGA circuit, the first driving circuit, the first cancel circuit and the PGA circuit are connected to a first end of a detection capacitor, a second end of the detection capacitor is grounded, and the processing circuit is connected to an output end of the front end circuit, and configured to determine a capacitance variation of a capacitance of the detection capacitor with respect to the base capacitance according to a voltage signal output by the front end circuit.