Display panel and display device

1. A display panel, comprising:

a base substrate, including a display region and a non-display region;

a pixel array, disposed in the display region; and

at least one fingerprint recognition unit, located in the non-display region and sharing the base substrate with the pixel array, wherein:

each fingerprint recognition unit includes a fingerprint recognition sensor, wherein the fingerprint recognition sensor includes a first electrode layer, a P-type-semiconductor/insulator/N-type-semiconductor (PIN) layer, and a second electrode layer disposed in a sequential order, and the first electrode layer includes a transparent electrode material,

the non-display region includes a step bending region and a fingerprint recognition region, wherein the fingerprint recognition region is located on a side of the step bending region away from the display region, and the at least one fingerprint recognition unit is located in the fingerprint recognition region, and

the display panel is folded at the step bending region, wherein after the display panel is folded, the first electrode layer of each fingerprint recognition unit is located on a side surface of the PIN layer close to a light-emitting surface of the display panel, and a folding direction of the display panel is opposite to a light-emitting direction of the display panel.

2. The display panel according to claim 1 , wherein:

a thickness of the first electrode layer is in a range of approximately 100 nm to 200 nm.

3. The display panel according to claim 1 , wherein:

the first electrode layer includes indium tin oxide.

4. The display panel according to claim 1 , further including a thin-film transistor array layer and an organic light-emitting material layer sequentially disposed on the base substrate, wherein:

the thin-film transistor array layer includes a gate metal layer and a source/drain metal layer stacked along a direction perpendicular to the base substrate; and

the organic light-emitting material layer includes an anode layer, a pixel defining layer, an organic light emitting material layer, and a cathode layer sequentially disposed in the direction perpendicular to the base substrate.

5. The display panel according to claim 4 , wherein:

the anode layer includes a transparent electrode material disposed in a same layer as the first electrode layer.

6. The display panel according to claim 4 , wherein:

the fingerprint recognition unit further includes a fingerprint recognition driving circuit and a storage capacitor, wherein the fingerprint recognition driving circuit at least includes a first thin-film transistor, and the first thin-film transistor is disposed in the thin-film transistor array layer.

7. The display panel according to claim 4 , wherein:

the first electrode layer is located between the gate metal layer and the anode layer.

8. The display panel according to claim 4 further including a capacitor metal layer, wherein:

the capacitor metal layer is located between the gate metal layer and the source/drain metal layer;

the capacitor metal layer includes a transparent electrode material; and

the capacitor metal layer is disposed in a same layer as the first electrode layer.

9. The display panel according to claim 1 , wherein:

the base substrate includes a transparent material; and

the display panel includes a thin-film transistor array layer disposed on the base substrate, wherein the thin-film transistor array layer includes a plurality of oxide thin-film transistors.

10. The display panel according to claim 9 , wherein:

the fingerprint recognition unit further includes a fingerprint recognition driving circuit and a storage capacitor, wherein the fingerprint recognition driving circuit at least includes a first thin-film transistor, and the first thin-film transistor is disposed in the thin-film transistor array layer.

11. The display panel according to claim 9 , wherein:

the base substrate is made of a transparent polyimide (PI); and

the plurality of oxide thin-film transistors include channel layers made of one or more of ZnO, Zn—Sn—O, In—Zn—O, MgZnO, In—Ga—O, and In 2 O 3 .

12. The display panel according to claim 1 , wherein:

after the display panel is folded at the step bending region, the step bending region divides the display panel into a front surface region and a back surface region, and the base substrate located in the back surface region is bonded to the base substrate located in the front surface region through an optical adhesive.

13. The display panel according to claim 12 , wherein:

the optical adhesive is an optically clear adhesive with a total light transmittance greater than 99%.

14. A display device, comprising:

a display panel, including:

a base substrate, including a display region and a non-display region;

a pixel array, disposed in the display region; and

at least one fingerprint recognition unit, located in the non-display region and sharing the base substrate with the pixel array, wherein:

each fingerprint recognition unit includes a fingerprint recognition sensor, wherein the fingerprint recognition sensor includes a first electrode layer, a PIN layer, and a second electrode layer disposed in a sequential order, and the first electrode layer includes a transparent electrode material,

the non-display region includes a step bending region and a fingerprint recognition region, wherein the fingerprint recognition region is located on a side of the step bending region away from the display region, and the at least one fingerprint recognition unit is located in the fingerprint recognition region, and

the display panel is folded at the step bending region, wherein after the display panel is folded, the first electrode layer of each fingerprint recognition unit is located on a side surface of the PIN layer close to a light-emitting surface of the display panel, and a folding direction of the display panel is opposite to a light-emitting direction of the display panel.

15. The display device according to claim 14 , wherein:

a thickness of the first electrode layer is in a range of approximately 100 nm to 200 nm.

16. The display device according to claim 14 , wherein:

the first electrode layer includes indium tin oxide.

17. The display device according to claim 14 , wherein the display panel further includes a thin-film transistor array layer and an organic light-emitting material layer sequentially disposed on the base substrate, wherein:

the thin-film transistor array layer includes a gate metal layer and a source/drain metal layer stacked along a direction perpendicular to the base substrate; and

the organic light-emitting material layer includes an anode layer, a pixel defining layer, an organic light-emitting material, and a cathode layer sequentially disposed in the direction perpendicular to the base substrate.

18. The display device according to claim 17 , wherein:

the anode layer includes a transparent electrode material disposed in a same layer as the first electrode layer.

19. The display device according to claim 17 , wherein:

the first electrode layer is located between the gate metal layer and the anode layer.

20. The display device according to claim 14 , wherein:

the base substrate includes a transparent material; and

the display panel includes a thin-film transistor array layer disposed on the base substrate, wherein the thin-film transistor array layer includes a plurality of oxide thin-film transistors.