Touch display panel and driving method thereof

1. A touch display panel, divided into an active area, a non-active area surrounding the active area, and a driving circuit area located on a side of the non-active area, the touch display panel comprising:

a plurality of electrode blocks arranged in an array and spaced apart in the active area;

an inner common electrode line surrounding the active area and disposed in the non-active area, a spacing area being provided between the active area and a portion of the inner common electrode line that is located away from a side where the driving circuit area is located;

a plurality of dummy touch driving electrode lines arranged in parallel and running through the active area, the plurality of dummy touch driving electrode lines being in one-to-one correspondence with at least electrode blocks close to the spacing area in the plurality of electrode blocks, and each dummy touch driving electrode line being electrically connected to a corresponding one of the plurality of electrode blocks; and

switch circuits disposed in the spacing area that are in one-to-one correspondence with the electrode blocks electrically connected to the dummy touch driving electrode lines, the switch circuits being used for electrically connecting the inner common electrode line to the dummy touch driving electrode lines; wherein

each switch circuit includes an input end and an output end, and the input end is electrically connected to the inner common electrode line; and

one end of any dummy touch driving electrode line electrically connected to an electrode block is electrically connected to an output end of a corresponding switch circuit, and another end of the dummy touch driving electrode line is left unconnected.

2. The touch display panel according to claim 1 , wherein the plurality of dummy touch driving electrode lines arranged in parallel are arranged in a column direction; and

electrode blocks in one-to-one correspondence with and electrically connected to the plurality of dummy touch driving electrode lines arranged in parallel include at least a first row of electrode blocks close to the spacing area.

3. The touch display panel according to claim 2 , wherein a number of the plurality of dummy touch driving electrode lines arranged in parallel is less than a number of the plurality of electrode blocks; and

the plurality of dummy touch driving electrode lines arranged in parallel are in one-to-one correspondence with the first row of electrode blocks close to the spacing area, and are electrically connected to the first row of electrode blocks close to the spacing area respectively.

4. The touch display panel according to claim 1 , wherein each switch circuit further includes a control terminal; and

the touch display panel further comprises an integrated circuit disposed in the driving circuit area, wherein the integrated circuit is used for controlling the control terminal of the switch circuit.

5. The touch display panel according to claim 4 , wherein the touch display panel further comprises a plurality of touch driving electrode lines arranged in parallel and running through the active area; and

one end of each of the plurality of touch driving electrode lines arranged in parallel is electrically connected to a corresponding electrode block, and another end is electrically connected to the integrated circuit.

6. The touch display panel according to claim 4 , further comprising a flexible printed circuit board electrically connected to the integrated circuit.

7. A driving method of the touch display panel according to claim 1 , the driving method comprising:

in a display period, controlling the switch circuits to be turned on, so that an electrical signal on the inner common electrode line is transmitted through the switch circuits and the dummy touch driving electrode lines corresponding to the switch circuits to corresponding electrode blocks; and

in a touch period, controlling the switch circuits to be turned off, so as to disconnect the inner common electrode line from the electrode blocks.

8. The driving method according to claim 7 , wherein in an inter-frame driving mode, a time of a single frame is composed of a single display period and a single touch period.

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

in the display period, inputting normal display signals to the touch display panel; and

in the touch period, inputting a touch signal to the touch display panel.

10. The driving method according to claim 9 , wherein in an intra-frame driving mode, a time of a single frame is composed of display periods and touch periods interspersed among the display periods; and

the driving method includes:

step 1, equally dividing a touch signal into m signals, wherein m is equal to or greater than 2;

step 2, in an i-th display period of a frame, inputting display signals and turning on the switch circuits, so as to display an i-th portion of the frame and cause an electrical signal on the inner common electrode line to be transmitted through the switch circuits to corresponding electrode blocks;

step 3, in an i-th touch period immediately after the i-th display period of the frame, inputting an i-th signal divided from the touch signal and controlling the switch circuits to be turned off, so as to disconnect the inner common electrode line from the electrode blocks; and

sequentially repeating step 2 and step 3 until all portions of the frame are displayed,

wherein i is set to a value from 1 to m in order.