Provided are a capacitance detecting circuit, a touch control chip, a touch detection apparatus and an electronic device. The capacitance detecting circuit, by configuring a first input side of an operational amplifier as a preset voltage, and utilizing the same characteristics of voltages at two input sides of the operational amplifier, enables that an output voltage in a touch sensor is configured as a preset voltage by a second input side of the operational amplifier, and by changing a position of a drive of a coding voltage, mutual-capacitance and self-capacitance detection can be realized with the same circuit. After replicating a single-channel current signal output by the operational amplifier into a multi-channel current signal, a current subtracting circuit is used to determine a differential signal of current signals output by two adjacent channels, and the differential signal is converted into a voltage through a charge amplifying circuit.

Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.

There is provided a touch detection circuit including a charging circuit, a discharging circuit, a counter and a processor. The charging circuit charges a detection capacitor within a charging interval using different currents. The discharging circuit discharges the detection capacitor within a discharging interval using different currents. The counter counts the charging interval and the discharging interval. The processor subtracts a baseline time from a counted charging time and a counted discharging time to cancel the noise interference.

To provide a hysteresis comparator having a small circuit area and low power consumption. The hysteresis comparator includes a comparator, a switch, a first capacitor, a second capacitor, and a logic circuit. A first terminal of the switch is electrically connected to one of a pair of conductive regions of the first capacitor, one of a pair of conductive regions of the second capacitor, and a first input terminal of the comparator. An output terminal of the comparator is electrically connected to an input terminal of the logic circuit. An output terminal of the logic circuit is electrically connected to the other of the pair of conductive regions of the second capacitor. The logic circuit has a function of generating an inverted signal of a signal input to the input terminal of the logic circuit and outputting the inverted signal to the output terminal of the logic circuit. A reference potential is input to the first input terminal of the comparator and the reference potential is held by the switch. Due to change in the potential of the output terminal of the comparator, the reference potential is changed by capacitive coupling of the second capacitor.

There is provided a touch detection circuit including a charging circuit, a discharging circuit, a counter and a processor. The charging circuit charges a detection capacitor within a charging interval using different currents. The discharging circuit discharges the detection capacitor within a discharging interval using different currents. The counter counts the charging interval and the discharging interval. The processor subtracts a baseline time from a counted charging time and a counted discharging time to cancel the noise interference.

Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.

The disclosure provides an integrator, a touch display device, and a driving method therefor which can perform amplification and integration functions together. The integrator includes an amplifier having a non-inverting input terminal to which a reference signal having a pulse waveform is supplied; at least one feedback capacitor; a first path switching unit configured to connect the feedback capacitor between an inverting input terminal and an output terminal of the amplifier during a rising period of the reference signal; and a second path switching unit configured to connect the feedback capacitor between the inverting input terminal and the output terminal of the amplifier during a falling period of the reference signal, wherein, during each of the rising period and the falling period of the reference signal, a voltage difference between the reference signal and a signal applied to the inverting input terminal of the amplifier is amplified and accumulated, and the amplified and accumulated voltage difference is output.

An embodiment of the present disclosure relates to a method of detection of a touch contact by a sensor including a first step of comparison of a voltage with a first voltage threshold; and a second step of comparison of the voltage with a second voltage threshold, the second step being implemented if the first voltage threshold has been reached within a duration shorter than a first duration threshold, the second voltage threshold being higher than the first voltage threshold.

The present disclosure provides a touch detection circuit which comes with additional, new functions, an input device and an electronic apparatus. N first terminals (Ps) are each connected with a corresponding first electrode (Es). A second terminal (Pc) is connected with a second electrode (Ec). N first capacitance detection circuits (210) correspond to the N first terminals (Ps), change voltages of the first terminals (Ps), respectively, and each generate a first detection signal indicating an electrostatic capacitance of the corresponding first electrode (Es) in accordance with movement of a charge produced in the corresponding first terminal (Ps). A cancelling circuit (240) driving the second terminal (Pc) in a manner that a voltage of the second terminal (Pc) follows a voltage of the first terminal (Ps). A second capacitance detection circuit (260) generating a second detection signal indicating an electrostatic capacitance of the second electrode (Ec).

There is provided a detection chip including a charging circuit, a discharging circuit, a counter and a processor. The charging circuit provides a first charging current within a first charging interval, and provides a second charging current, smaller than the first charging current, within a second charging interval. The discharging circuit provides a first discharging current within a first discharging interval, and provides a second discharging current, smaller than the first discharging current, within a second discharging interval. The counter counts the second charging interval and the second discharging interval. The processor identifies a touch event according to the second charging interval and the second discharging interval.