Patent ID: 11947753
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A touch driving circuit configured to output a driving signal to drive a touch electrode of a touch display device, comprising: a power supply voltage generation circuit, a switching circuit, a first energy storage capacitor and a second energy storage capacitor;
wherein a first input end of the switching circuit is connected to the power supply voltage generation circuit; a second input end of the switching circuit is connected to a ground terminal GND through the first energy storage capacitor; a third input end of the switching circuit is connected to the ground terminal GND; wherein a fourth input end of the switching circuit is connected to the ground terminal GND through the second energy storage capacitor; and a fifth input end of the switching circuit is connected to the power supply voltage generation circuit; and an output end of the switching circuit is connected to the touch electrode;
the power supply voltage generation circuit is configured to generate a first positive voltage and a first negative voltage; and
the switching circuit is configured to control the touch electrode to be connected to the power supply voltage generation circuit during a first period of time, the touch electrode being charged with the first positive voltage, so that a voltage at two ends of the touch electrode is equal to the first positive voltage; control the touch electrode to be connected to the first energy storage capacitor during a second period of time, the first energy storage capacitor being configured to store charges released by the touch electrode, so that the voltage at the two ends of the touch electrode is equal to a second positive voltage; control the touch electrode to be connected to the ground terminal GND during a third period of time, the touch electrode being discharged to the ground terminal GND, so that the voltage at the two ends of the touch electrode is equal to a zero voltage; control the touch electrode to be connected to the second energy storage capacitor during a fourth period of time, the second energy storage capacitor being configured to transfer the stored charges to the touch electrode, so that the voltage at the two ends of the touch electrode is equal to a second negative voltage; and control the touch electrode to be connected to the power supply voltage generation circuit during a fifth period of time, the touch electrode being charged with the first negative voltage, so that the voltage at the two ends of the touch electrode is equal to the first negative voltage;
where the second positive voltage is lower than the first positive voltage and higher than the zero voltage;
where the second negative voltage is higher than the first positive voltage and lower than the zero voltage.