Touch substrate, touch substrate driving method and preparation method, and touch device

1. A touch substrate, comprising: an underlying substrate and a touch layer,

wherein the touch layer is on the underlying substrate;

the touch layer comprises a plurality of touch electrodes which are electrically separated from each other, the plurality of touch electrodes are annularly arranged around a preset reference point, the plurality of touch electrodes are uniformly arranged in a circular ring and centered on the preset reference point, and each of the touch electrodes overlaps with an edge area of the touch substrate in a direction perpendicular to the underlying substrate;

each of the touch electrodes is electrically connected with a touch signal line on the underlying substrate in the edge area;

the preset reference point is away from a center position of the touch substrate, and the plurality of touch electrodes are identical in area; and

a distance between the preset reference point and each of the touch electrodes is identical to each other.

2. The touch substrate according to claim 1 , wherein at least an edge of each of the touch electrodes is in the edge area of the touch substrate.

3. The touch substrate according to claim 1 , wherein each of the touch electrodes is connected to the touch signal line on the underlying substrate through a via hole in the edge area.

4. The touch substrate according to claim 1 , wherein the plurality of touch electrodes are separated according to separator lines, and each of the separator lines extends from the preset reference point on the touch layer to the edge area.

5. The touch substrate according to claim 1 , wherein a maximum width of each of the touch electrodes is less than or equal to an average finger width.

6. The touch substrate according to claim 1 , wherein a material of the touch layer comprises a metal with a low work function or a metal alloy with a low work function.

7. The touch substrate according to claim 1 , further comprising a first electrode layer, a pixel definition layer, and an organic light-emitting layer,

wherein the first electrode layer and the pixel definition layer comprise patterns on the underlying substrate,

the organic light-emitting layer is on a side, away from the underlying substrate, of the first electrode layer and the pixel definition layer, and

the touch layer is on a side, away from the underlying substrate, of the organic light-emitting layer.

8. The touch substrate according to claim 7 , wherein the touch layer is further configured to be a second electrode layer corresponding to the first electrode layer.

9. The touch substrate according to claim 8 , wherein the first electrode layer is an anode layer, and the second electrode layer is a cathode layer.

10. The touch substrate according to claim 7 , further comprising a plurality of spacers,

wherein the plurality of spacers are between the pixel definition layer and the organic light-emitting layer,

orthographic projections of the plurality of spacers on the underlying substrate overlap with orthographic projections of gaps between the plurality of touch electrodes on the underlying substrate, and

the plurality of touch electrodes are separated by the plurality of spacers.

11. The touch substrate according to claim 10 , wherein a cross section of each of the spacers in a direction perpendicular to an extending direction of each of the gaps between the touch electrodes is an inverted trapezoid.

12. A driving method of the touch substrate according to claim 1 , comprising:

inputting a touch signal to the touch layer of the touch substrate in a touch phase, and

inputting a display signal to the touch layer in a display phase.

13. The touch substrate according to claim 1 , wherein the plurality of touch electrodes do not cover the center of the touch layer.

14. The touch substrate according to claim 1 , wherein the preset reference point is determined based on a method of dividing functional areas of the touch substrate.