Touch driving circuit and driving method therefor, and display device

1 . A touch driving circuit, comprising:

a plurality of first touch signal terminals and a plurality of second touch signal terminals, a number of the first touch signal terminals being greater than a number of the second touch signal terminals;

a plurality of analog front-end circuits, a number of the analog front-end circuits being equal to the number of the second touch signal terminals; wherein an analog front-end circuit is connected to a second touch signal terminal, and each analog front-end circuit in at least one analog front-end circuit is connected to at least two first touch signal terminals;

a plurality of first control switches, wherein the analog front-end circuit connected to the at least two first touch signal terminals is connected to at least two first touch signal terminals by at least two first control switches; and the at least two first control switches are configured to be turned on in a time-sharing mode to transmit first touch detection signals from the at least two first touch signal terminals to the analog front-end circuit in time-sharing mode; and

a plurality of second control switches, wherein each analog front-end circuit is connected to a second touch signal terminal by a second control switch.

2 . The touch driving circuit according to claim 1 , wherein each analog front-end circuit is connected to two first touch signal terminals and one second touch signal terminal.

3 . The touch driving circuit according to claim 1 , further comprising:

a plurality of first output circuits, wherein each first output circuit is connected to a first touch signal terminal, and the first output circuit is configured to output a first driving signal to the first touch signal terminal; and

a plurality of second output circuits, wherein each second output circuit is connected to a second touch signal terminal, and the second output circuit is configured to output a second driving signal to the second touch signal terminal.

4 . The touch driving circuit according to claim 3 , wherein a number of the first output circuits is greater than a number of the second output circuits, and the number of the second output circuits is equal to the number of the analog front-end circuits.

5 . The touch driving circuit according to claim 3 , wherein the first touch signal terminal is one of a touch transmitting signal terminal and a touch sensing signal terminal, and the second touch signal terminal is another of the touch transmitting signal terminal and the touch sensing signal terminal.

6 . The touch driving circuit according to claim 5 , wherein in the first output circuit and the second output circuit, an output circuit connected to the touch transmitting signal terminal includes:

a first switch and a second switch, wherein a first end of the first switch is connected to a first voltage signal terminal, and a second end of the first switch is connected to the corresponding touch transmitting signal terminal; and a first end of the second switch is connected to a second voltage signal terminal, and a second end of the second switch is connected to the corresponding touch transmitting signal terminal.

7 . The touch driving circuit according to claim 6 , wherein in the first output circuit and the second output circuit, the output circuit connected to the touch transmitting signal terminal further includes:

a third switch, wherein a first end of the third switch is connected to a third voltage signal terminal, and a second end of the third switch is connected to the corresponding touch transmitting signal terminal; wherein

a voltage value of one of a second voltage signal provided by the second voltage signal terminal and a third voltage signal provided by the third voltage signal terminal is greater than a voltage value of a first voltage signal provided by the first voltage signal terminal, and a voltage value of another of the second voltage signal provided by the second voltage signal terminal and the third voltage signal provided by the third voltage signal terminal is less than the voltage value of the first voltage signal.

8 . The touch driving circuit according to claim 5 , wherein in the first output circuit and the second output circuit, an output circuit connected to the touch sensing signal terminal includes:

a fourth switch and a fifth switch, wherein a first end of the fourth switch is connected to a first voltage signal terminal, and a second end of the fourth switch is connected to the corresponding touch sensing signal terminal; and a first end of the fifth switch is connected to a second voltage signal terminal, and a second end of the fifth switch is connected to the corresponding touch sensing signal terminal.

9 . The touch driving circuit according to claim 1 , further comprising:

a plurality of first electrostatic protection units, each first electrostatic protection unit being connected between a first touch signal terminal and a first control switch; and

a plurality of second electrostatic protection units, each second electrostatic protection unit being connected between the second touch signal terminal and the second control switch.

10 . A display device, comprising: a display panel and a touch driving circuit connected to the display panel, wherein

the touch driving circuit is the touch driving circuit according to claim 1 ; and

the display panel includes:

a plurality of first touch channels arranged in parallel and at intervals in a first direction, wherein each first touch channel extends in a second direction, the first direction intersects the second direction; and a first touch channel is connected to a first touch signal terminal of the touch driving circuit; and

a plurality of second touch channels arranged in parallel and at intervals in the second direction, wherein each second touch channel extends in the first direction; and a second touch channel is connected to a second touch signal terminal of the touch driving circuit.

11 . A driving method for a touch driving circuit, applied to the touch driving circuit according to claim 1 , wherein the touch driving circuit further includes a first output circuit connected to a first touch signal terminal and a second output circuit connected to a second touch signal terminal; in the touch driving circuit, the first touch signal terminal is a touch transmitting signal terminal, and the second touch signal terminal is a touch sensing signal terminal;

the driving method comprises a self-capacitance detection phase, and the self-capacitance detection phase includes:

applying, by the first output circuit, a first driving signal to the first touch signal terminal; and transmitting, by at least two first touch signal terminals connected to a same analog front-end circuit, first touch detection signals to the corresponding analog front-end circuit in a time-sharing mode based on a capacitance change of a touch structure in a display panel; and

applying, by the second output circuit, a second driving signal to the second touch signal terminal; and transmitting, by the second touch signal terminal, a second touch detection signal to an analog front-end circuit connected to the second touch signal terminal based on the capacitance change of the touch structure in the display panel.

12 . The driving method according to claim 11 , further comprising a mutual capacitance detection phase, wherein the mutual capacitance detection phase includes:

applying, by the first output circuit, the first driving signal to the first touch signal terminal; and transmitting, by the second touch signal terminal, the second touch detection signal to the analog front-end circuit connected to the second touch signal terminal based on the capacitance change of the touch structure in the display panel.

13 . A driving method for a touch driving circuit, applied to the touch driving circuit according to claim 1 , wherein the touch driving circuit further includes a second output circuit connected to a second touch signal terminal; in the touch driving circuit, a first touch signal terminal is a touch sensing signal terminal, and the second touch signal terminal is a touch transmitting signal terminal;

the driving method comprises a mutual capacitance detection phase, and the mutual capacitance detection phase includes:

applying, by the second output circuit, a second driving signal to the second touch signal terminal; and transmitting, by at least two first touch signal terminals connected to a same analog front-end circuit, first touch detection signals to the analog front-end circuit connected to the at least two first touch signal terminals in a time-sharing mode based on a capacitance change of a touch structure in a display panel.

14 . The driving method according to claim 13 , wherein the touch driving circuit further includes a first output circuit connected to a first touch signal terminal; the driving method further comprises a self-capacitance detection phase, and the self-capacitance detection phase includes:

applying, by the first output circuit, a first driving signal to the first touch signal terminal; and transmitting, by the at least two first touch signal terminals connected to the same analog front-end circuit, the first touch detection signals to the analog front-end circuit connected to the at least two first touch signal terminals in a time-sharing mode based on the capacitance change of the touch structure in the display panel; and

applying, by the second output circuit, a second driving signal to the second touch signal terminal; and transmitting, by the second touch signal terminal, a second touch detection signal to an analog front-end circuit connected to the second touch signal terminal based on the capacitance change of the touch structure in the display panel.

15 . A touch driving circuit, comprising:

a plurality of first touch signal terminals and a plurality of second touch signal terminals;

a plurality of analog front-end circuits, a number of the analog front-end circuits being less than a number of the first touch signal terminals and less than a number of the second touch signal terminals; wherein each analog front-end circuit in at least one analog front-end circuit is connected to at least two first touch signal terminals, and each analog front-end circuit in the at least one analog front-end circuit is connected to at least two second touch signal terminals; and

a plurality of first control switches, wherein the analog front-end circuit connected to the at least two first touch signal terminals is connected to the at least two first touch signal terminals by at least two first control switches; and the at least two first control switches are configured to be turned on in a time-sharing mode to transmit first touch detection signals from the at least two first touch signal terminals to the analog front-end circuit in time-sharing mode.

16 . The touch driving circuit according to claim 15 , wherein the number of the first touch signal terminals is equal to the number of the second touch signal terminals, and each analog front-end circuit is connected to at least two first touch signal terminals and at least two second touch signal terminals.

17 . A driving method for a touch driving circuit, applied to the touch driving circuit according to claim 15 , wherein the touch driving circuit further includes a first output circuit connected to a first touch signal terminal; in the touch driving circuit, the first touch signal terminal is a touch transmitting signal terminal, and a second touch signal terminal is a touch sensing signal terminal;

the driving method comprises a mutual capacitance detection phase, and the mutual capacitance detection phase includes:

applying, by the first output circuit, a first driving signal to the first touch signal terminal; and transmitting, by at least two second touch signal terminals connected to a same analog front-end circuit, second touch detection signals to the analog front-end circuit connected to the at least two second touch signal terminals in a time-sharing mode based on a capacitance change of a touch structure in a display panel.

18 . The driving method according to claim 17 , wherein the touch driving circuit further includes a second output circuit connected to a second touch signal terminal; the driving method further comprises a self-capacitance detection phase, and the self-capacitance detection phase includes:

applying, by the first output circuit, the first driving signal to the first touch signal terminal; and transmitting, by at least two first touch signal terminals connected to a same analog front-end circuit, first touch detection signals to the corresponding analog front-end circuit in a time-sharing mode based on the capacitance change of the touch structure in the display panel; and

applying, by the second output circuit, a second driving signal to the second touch signal terminal; and transmitting, by the at least two second touch signal terminals connected to the same analog front-end circuit, the second touch detection signals to the corresponding analog front-end circuit in a time-sharing mode based on the capacitance change of the touch structure in the display panel.

19 . A display device, comprising: a display panel and a touch driving circuit connected to the display panel, wherein

the touch driving circuit is the touch driving circuit according to claim 15 ; and

the display panel includes:

a plurality of first touch channels arranged in parallel and at intervals in a first direction, wherein each first touch channel extends in a second direction, the first direction intersects the second direction; and a first touch channel is connected to a first touch signal terminal of the touch driving circuit; and

a plurality of second touch channels arranged in parallel and at intervals in the second direction, wherein each second touch channel extends in the first direction; and a second touch channel is connected to a second touch signal terminal of the touch driving circuit.