Touch display panel and associated driving circuit and driving method

1. A driving circuit for a touch display panel, that selectively operates in a display mode or in a touch mode, the driving circuit comprising:

a display data generating circuit, that transmits display data to a plurality of data lines of a pixel array of the touch display panel when the driving circuit operates in the display mode;

a touch control circuit, that transmits a touch driving signal to the plurality of data lines and performs touch detection by detecting capacitance changes on the plurality of data lines when the driving circuit operates in the touch mode; and

a common electrode control circuit configured to control at least a part of a common electrode of the touch display panel to have a signal waveform on the at least the part of the common electrode to be identical to a corresponding signal waveform of the touch driving signal when the driving circuit operates in the touch mode, and further configured to control providing a zero signal to the at least the part of the common electrode when the driving circuit operates in the display mode.

2. The driving circuit according to claim 1 , wherein in a display period of display data of one frame, the driving circuit alternately switches between the touch mode and the display mode for a plurality of times.

3. The driving circuit according to claim 2 , wherein in the display period of the display data of one frame, each time when the driving circuit operates in the touch mode, the driving circuit simultaneously turns on a plurality of gate lines in the pixel array, and the touch circuit transmits the touch driving signal to the plurality of data lines and performs touch detection by detecting the capacitance changes on the plurality of data lines.

4. The driving circuit according to claim 3 , wherein, after the driving circuit simultaneously turns on the plurality of gate lines in the pixel array, and the touch circuit transmits the touch driving signal to the plurality of data lines and performs touch detection by detecting the capacitance changes on the plurality of data lines, the driving circuit switches to the display mode and sequentially turns on the plurality of gate lines, and the display data generating circuit sequentially transmits the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.

5. The driving circuit according to claim 2 , wherein the gate lines in the pixel array are divided into a plurality of groups each comprising a plurality of gate lines; and in the display period of the display data of one frame, for each group, the driving circuit first operates in the touch mode, and the driving circuit simultaneously turns on the plurality of gate lines in the group, transmits the touch driving signal to the plurality of data lines, and performs touch detection by detecting the capacitance changes on the plurality of data lines; and the driving circuit immediately operates in the display mode and sequentially turns on the plurality of gate lines in the group, and the display data generating circuit sequentially transmits the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.

6. A driving method for a touch display panel, comprising:

selectively operating in a display mode or in a touch mode;

when operating in the display mode, transmitting display data to a plurality of data lines of a pixel array of the touch display panel and controlling providing a zero signal to at least a part of a common electrode of the touch display panel; and

when operating in the touch mode, transmitting a touch driving signal to the plurality of data lines, performing touch detection by detecting capacitance changes on the plurality of data lines and controlling the at least the part of the common electrode of the touch display panel to have a signal waveform on the at least the part of the common electrode to be identical to a corresponding signal waveform of the touch driving signal.

7. The driving method according to claim 6 , further comprising:

in a display period of display data of one frame, alternately switching between the touch mode and the display mode for a plurality of times.

8. The driving method according to claim 7 , further comprising:

in the display period of the display data of one frame, each time when operating in the touch mode, simultaneously turning on a plurality of gate lines in the pixel array, transmitting the touch driving signal to the plurality of data lines, and performing touch detection by detecting the capacitance changes on the plurality of data lines.

9. The driving method according to claim 8 , after the step of simultaneously turning on the plurality of gate lines in the pixel array, transmitting the touch driving signal to the plurality of data lines and performing touch detection by detecting the capacitance changes on the plurality of data lines, the driving method further comprising:

switching to the display mode, sequentially turning on the plurality of gate lines, and sequentially transmitting the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.

10. The driving method according to claim 7 , the gate lines in the pixel

array being divided into a plurality of groups each comprising a plurality of gate lines, the driving method further comprising:

in the display period of the display data of one frame, for each group, first operating in the touch mode, simultaneously turning on the plurality of gate lines in the group, transmitting the touch driving signal to the plurality of data lines, and performing touch detection by detecting the capacitance changes on the plurality of data lines; and

immediately operating in the display mode, sequentially turning on the plurality of gate lines in the group, and sequentially transmitting the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.

11. A touch display panel, comprising:

a pixel array;

a common electrode, disposed on the pixel array; and

a driving circuit, coupled to the pixel array and the common electrode, selectively operating in a display mode or a touch mode;

wherein, when the driving circuit operates in the display mode, the driving circuit transmits display data to a plurality of data lines in the pixel array and controls providing a zero signal to at least a part of a common electrode of the touch display panel; and

when the driving circuit operates in the touch mode, the driving circuit transmits a touch driving signal to the plurality of data lines performs touch detection by detecting capacitance changes on the plurality of data lines, and controls the at least the part of the common electrode of the touch display panel to have a signal waveform on the at least the part of the common electrode to be identical to a corresponding signal waveform of the touch driving signal.

12. The touch display panel according to claim 11 , wherein in a display period of display data of one frame, the driving circuit switches alternately between the touch mode and the display mode for a plurality of times.

13. The touch display panel according to claim 12 , wherein in the display period of the display data of one frame, each time when the driving circuit operates in the touch mode, the driving circuit simultaneously turns on a plurality of gate lines in the pixel array, and the touch circuit transmits the touch driving signal to the plurality of data lines and performs touch detection by detecting the capacitance changes on the plurality of data lines.

14. The touch display panel according to claim 13 , wherein, after the driving circuit simultaneously turns on the plurality of gate lines in the pixel array, and the touch circuit transmits the touch driving signal to the plurality of data lines and performs touch detection by detecting the capacitance changes on the plurality of data lines, the driving circuit switches to the display mode and sequentially turns on the plurality of gate lines, and the display data generating circuit sequentially transmits the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.

15. The touch display panel according to claim 12 , wherein the gate lines in the pixel array are divided into a plurality of groups each comprising a plurality of gate lines; and in the display period of the display data of one frame, for each group, the driving circuit first operates in the touch mode, and the driving circuit simultaneously turns on the plurality of gate lines in the group, transmits the touch driving signal to the plurality of data lines, and performs touch detection by detecting the capacitance changes on the plurality of data lines; and the driving circuit immediately operates in the display mode and turns on the plurality of gate lines in the group, and the display data generating circuit sequentially transmits the display data corresponding to the pixels on the plurality of gate lines to the plurality of data lines.