Touch display device

1. A touch display device, comprising:

a thin-film transistor (TFT) substrate having a substrate and a TFT structure, wherein the TFT structure is disposed on the substrate and comprises a driving transistor; and

a light-emitting element disposed on the TFT structure and having a first end electrode, a light-emitting layer and a second end electrode, wherein the first end electrode is electrically connected with the driving transistor, and the light-emitting layer is disposed between the first end electrode and the second end electrode;

wherein, the first end electrode or the second end electrode is a touch sensing electrode of the touch display device.

2. The touch display device of claim 1 , wherein driving modes of the touch display device comprises a full-time driving mode and a part-time driving mode.

3. The touch display device of claim 2 , wherein when the touch display device operates in the part-time driving mode, a frame time of the touch display device comprises a display period and a sensing period.

4. The touch display device of claim 3 , wherein the first end electrode is coupled to a first power line, the second end electrode is coupled to a second power line, and during the sensing period, at least a first pulse signal is transmitted to the touch sensing electrode, and at least a second pulse signal is transmitted to the first power line or the second power line.

5. The touch display device of claim 3 , wherein the driving transistor is in a cutoff status during the sensing period.

6. The touch display device of claim 3 , wherein the first end electrode is coupled to a first power line, the second end electrode is coupled to a second power line, and during the sensing period, a voltage applied to the first power line is less than a voltage applied to the second power line.

7. The touch display device of claim 1 , wherein the touch sensing electrode comprises a plurality of electrode pads, and each of the electrode pads is electrically connected to at least a trace.

8. The touch display device of claim 7 , further comprising:

a reference electrode disposed corresponding to the electrode pads of the touch sensing electrode.

9. The touch display device of claim 8 , further comprising:

a flexible layer disposed between the reference electrode and the touch sensing electrode.

10. The touch display device of claim 8 , wherein a part of the electrode pads are used for sensing touch signals of a first direction and a second direction, another part of the electrode pads are used for sensing touch signals of a third direction, and the third direction is perpendicular to the first direction and the second direction.

11. A touch display device, comprising:

a thin-film transistor (TFT) substrate having a substrate and a TFT structure, wherein the TFT structure is disposed on the substrate and comprises a driving transistor;

a light-emitting element disposed on the TFT structure and having a first end electrode, a light-emitting layer and a second end electrode, wherein the first end electrode is electrically connected with the driving transistor, and the light-emitting layer is disposed between the first end electrode and the second end electrode; and

a touch sensing electrode disposed above the second end electrode or between the first end electrode and the substrate, and located corresponding to the first end electrode or the second end electrode.

12. The touch display device of claim 11 , wherein driving modes of the touch display device comprises a full-time driving mode and a part-time driving mode.

13. The touch display device of claim 12 , wherein the touch sensing electrode comprises a plurality of electrode pads, and each of the electrode pads is electrically connected to at least a trace.

14. The touch display device of claim 13 , further comprising:

a reference electrode disposed corresponding to the electrode pads of the touch sensing electrode.

15. The touch display device of claim 14 , further comprising:

a flexible layer disposed between the reference electrode and the touch sensing electrode.

16. The touch display device of claim 14 , wherein a part of the electrode pads are used for sensing touch signals of a first direction and a second direction, another part of the electrode pads are used for sensing touch signals of a third direction, and the third direction is perpendicular to the first direction and the second direction.

17. A touch display device, comprising:

a thin-film transistor (TFT) substrate having a substrate and a TFT structure, wherein the TFT structure is disposed on the substrate and comprises a driving transistor;

a light-emitting element disposed on the TFT structure and having a first end electrode, a light-emitting layer and a second end electrode, wherein the first end electrode is electrically connected with the driving transistor, and the light-emitting layer is disposed between the first end electrode and the second end electrode; and

a reference electrode disposed corresponding to the first end electrode or the second end electrode.

18. The touch display device of claim 17 , wherein the first end electrode or the second end electrode is a touch sensing electrode of the touch display device, wherein the touch sensing electrode comprises a plurality of electrode pads, and each of the electrode pads is electrically connected to at least a trace.

19. The touch display device of claim 18 , further comprising:

a flexible layer disposed between the reference electrode and the touch sensing electrode.

20. The touch display device of claim 18 , wherein a part of the electrode pads are used for sensing touch signals of a first direction and a second direction, another part of the electrode pads are used for sensing touch signals of a third direction, and the third direction is perpendicular to the first direction and the second direction.