Touch panel, fabricating method thereof and display device

1. A touch panel, comprising:

a substrate comprising a touch detection area and a fingerprint recognition area;

a plurality of touch detection units on the substrate and in the touch detection area, each touch detection unit comprising a touch detection electrode;

a plurality of fingerprint recognition units on the substrate and in the fingerprint recognition area, each fingerprint recognition unit comprising a fingerprint recognition electrode, and the fingerprint recognition electrode and the touch detection electrode being in a same layer;

a signal wiring layer on a same side of the substrate as the touch detection electrode and the fingerprint recognition electrode, and comprising a plurality of first signal transmission lines and a plurality of second signal transmission lines,

wherein the touch detection electrode is electrically coupled to a corresponding first signal transmission line and transmits a touch detection signal through the corresponding first signal transmission line;

the fingerprint recognition electrode is electrically coupled to a corresponding second signal transmission line and transmits a fingerprint recognition signal through the corresponding second signal transmission line, and

the touch panel further comprises a display function layer, wherein

the touch detection electrode, the fingerprint recognition electrode and the signal wiring layer are on a side of the display function layer proximal to the substrate; and

the display function layer comprises a plurality of gate lines, a plurality of data lines and a plurality of pixel units, each pixel unit corresponds to one gate line and one data line and comprises a pixel driving circuit and a light emitting device, the pixel driving circuit is configured to drive the light emitting device to emit light, the pixel driving circuit comprises a signal writing transistor, a gate of the signal writing transistor is coupled to the one gate line, and a first electrode of the signal writing transistor is coupled to the one data line.

2. The touch panel according to claim 1 , wherein the touch detection electrode in each of the plurality of touch detection units is a self-capacitive touch detection electrode; and

self-capacitive touch detection electrodes in the plurality of touch detection units are in one-to-one correspondence with the plurality of first signal transmission lines.

3. The touch panel according to claim 1 , wherein the touch detection electrode in each of the plurality of touch detection units comprises a first touch detection electrode and a second touch detection electrode;

the first touch detection electrode comprises a first sub-electrode and a second sub-electrode respectively on both sides of the second touch detection electrode, the first sub-electrode and the second sub-electrode are electrically coupled to each other through a bridge wire, and the bridge wire is insulated from the second touch detection electrode; and

one of the first touch detection electrode and the second touch detection electrode is a mutual capacitive touch scanning electrode, and the other of the first touch detection electrode and the second touch detection electrode is a mutual capacitive touch sensing electrode.

4. The touch panel according to claim 3 , wherein the plurality of touch detection units are arranged in an array, mutual capacitive touch scanning electrodes in a same row are electrically coupled to each other, and mutual capacitive touch sensing electrodes in a same column are electrically coupled to each other;

the plurality of first signal transmission lines comprise a plurality of touch scanning signal transmission lines and a plurality of touch sensing signal transmission lines, the mutual capacitive touch scanning electrodes in the same row are electrically coupled to a same touch scanning signal transmission line, the mutual capacitive touch scanning electrodes in different rows are electrically coupled to different touch scanning signal transmission lines, the mutual capacitive touch sensing electrodes in the same column are electrically coupled to a same touch sensing signal transmission line, and the mutual capacitive touch sensing electrodes in different columns are electrically coupled to different touch sensing signal transmission lines.

5. The touch panel according to claim 4 , wherein the bridge wire, the plurality of touch scanning signal transmission lines, and the plurality of touch sensing signal transmission lines are in a same layer.

6. The touch panel according to claim 1 , wherein the fingerprint recognition electrode in each of the plurality of fingerprint recognition units is a self-capacitive fingerprint recognition electrode; and

self-capacitive fingerprint recognition electrodes in the plurality of fingerprint recognition units are in one-to-one correspondence with the plurality of second signal transmission lines.

7. The touch panel according to claim 1 , wherein each fingerprint recognition unit further comprises a switching transistor;

in the fingerprint recognition unit, the fingerprint recognition electrode is electrically coupled to the corresponding second signal transmission line through the switching transistor, a gate of the switching transistor is coupled to a fingerprint scanning driving line corresponding to the fingerprint recognition electrode, a first electrode of the switching transistor is coupled to the second signal transmission line corresponding to the fingerprint recognition electrode, and a second electrode of the switching transistor is coupled to the fingerprint recognition electrode; and

the plurality of fingerprint recognition units are arranged in an array, fingerprint recognition electrodes in a same row correspond to a same fingerprint scanning driving line, fingerprint recognition electrodes in different rows correspond to different fingerprint scanning driving lines, fingerprint recognition electrodes in a same column correspond to a same second signal transmission line, and fingerprint recognition electrodes in different columns correspond to different second signal transmission lines.

8. The touch panel according to claim 1 , wherein orthographic projections of the plurality of data lines on the signal wiring layer cover the plurality of first signal transmission lines and the plurality of second signal transmission lines.

9. The touch panel according to claim 1 , wherein each fingerprint recognition unit further comprises a switching transistor;

in the fingerprint recognition unit, the fingerprint recognition electrode is electrically coupled to the corresponding second signal transmission line through the switching transistor, a gate of the switching transistor is coupled to a fingerprint scanning driving line corresponding to the fingerprint recognition electrode, a first electrode of the switching transistor is coupled to the second signal transmission line corresponding to the fingerprint recognition electrode, and a second electrode of the switching transistor is coupled to the fingerprint recognition electrode;

the plurality of fingerprint recognition units are arranged in an array, fingerprint recognition electrodes in a same row correspond to a same fingerprint scanning driving line, fingerprint recognition electrodes in different rows correspond to different fingerprint scanning driving lines, fingerprint recognition electrodes in a same column correspond to a same second signal transmission line, and fingerprint recognition electrodes in different columns correspond to different second signal transmission lines; and

the gate of the switching transistor and the gate of the signal writing transistor are in a same layer, an active layer of the switching transistor and an active layer of the signal writing transistor are in a same layer, and the first and second electrodes of the switching transistor and the first and second electrodes of the signal writing transistor are in a same layer.

10. The touch panel according to claim 9 , wherein the fingerprint scanning driving lines corresponding to the fingerprint recognition electrodes of the plurality of fingerprint recognition units are implemented by at least a part of the plurality of gate lines.

11. The touch panel according to claim 1 , wherein a planarization layer is disposed between the display function layer and the signal wiring layer.

12. The touch panel according to claim 1 , wherein the light emitting device comprises a current-driven light emitting device.

13. The touch panel according to claim 1 , wherein the signal wiring layer is on a side of a layer where the touch detection electrode and the fingerprint recognition electrode are located distal to the substrate.

14. The touch panel according to claim 1 , wherein a size of the touch detection electrode is larger than a size of the fingerprint recognition electrode.

15. A method for fabricating a touch panel, comprising:

providing a substrate, wherein the substrate comprises a touch detection area and a fingerprint recognition area;

forming a plurality of touch detection units on the substrate in the touch detection area, and forming a plurality of fingerprint recognition units on the substrate in the fingerprint recognition area, wherein each of the plurality of touch detection units comprises a touch detection electrode, each of the plurality of fingerprint recognition units comprises a fingerprint recognition electrode, and the fingerprint recognition electrode and the touch detection electrode are disposed in a same layer;

forming a signal wiring layer on the substrate, wherein the signal wiring layer comprises a plurality of first signal transmission lines and a plurality of second signal transmission lines, the touch detection electrode is electrically coupled to a corresponding first signal transmission line and transmits a touch detection signal through the corresponding first signal transmission line, and the fingerprint recognition electrode is electrically coupled to a corresponding second signal transmission line and transmits a fingerprint recognition signal through the corresponding second signal transmission line; and

forming a display function layer on the substrate, wherein

the touch detection electrode, the fingerprint recognition electrode and the signal wiring layer are on a side of the display function layer proximal to the substrate; and

the display function layer comprises a plurality of gate lines, a plurality of data lines and a plurality of pixel units, each pixel unit corresponds to one gate line and one data line and comprises a pixel driving circuit and a light emitting device, the pixel driving circuit is configured to drive the light emitting device to emit light, the pixel driving circuit comprises a signal writing transistor, a gate of the signal writing transistor is coupled to the one gate line, and a first electrode of the signal writing transistor is coupled to the one data line.

16. The method according to claim 15 , wherein the signal wiring layer is formed after the plurality of touch detection units and the plurality of fingerprint recognition units are formed.

17. The method according to claim 15 , wherein forming a display function layer on the substrate comprises:

forming the pixel driving circuit and a switching transistor simultaneously through a transistor fabricating process, wherein the fingerprint recognition electrode is electrically coupled to the corresponding second signal transmission line through the switching transistor, a gate of the switching transistor and the gate of the signal writing transistor are disposed in a same layer, an active layer of the switching transistor and an active layer of the signal writing transistor are disposed in a same layer, and first and second electrodes of the switching transistor and first and second electrodes of the signal writing transistor are disposed in a same layer; and

forming the light emitting device by a light emitting device fabricating process.

18. A display device, comprising the touch panel according to claim 1 .