Array substrate and method for manufacturing the same, method and assembly for detecting light, and display device

1. An array substrate, comprising:

a base substrate having a pixel region; and

a light detecting unit, a switch unit, and a light emitting unit that are located in the pixel region, wherein the light emitting unit is electrically connected to the switch unit, the light detecting unit is insulated from the switch unit, and a current generated by the light detecting unit under irradiation of light affects an output current of the switch unit, so that the light detecting unit and the light emitting unit share the switch unit.

2. The array substrate according to claim 1 , wherein,

the switch unit is located on a side away from a photosensitive side of the light detecting unit, and an orthographic projection of the light detecting unit onto the base substrate is at least partially overlapped with an orthographic projection of the switch unit onto the base substrate.

3. The array substrate according to claim 2 , wherein,

the orthographic projection of the switch unit onto the base substrate covers the orthographic projection of the light detecting unit onto the base substrate.

4. The array substrate according to claim 2 , wherein,

the light detecting unit comprises a first electrode, a photosensitive layer, and a second electrode that are sequentially stacked in a direction close to the switch unit; and

the switch unit comprises an active layer, a control terminal, a first terminal, and a second terminal, wherein the control terminal, the first terminal, and the second terminal are located on a side of the active layer away from the light detecting unit, and one of the first terminal and the second terminal is a source, and the other thereof is a drain.

5. The array substrate according to claim 4 , wherein,

the second electrode is made of a light-shielding material, and an orthographic projection of the second electrode onto the base substrate is at least partially overlapped with an orthographic projection of the active layer onto the base substrate.

6. The array substrate according to claim 5 , wherein,

the orthographic projection of the second electrode onto the base substrate covers the orthographic projection of the active layer onto the base substrate.

7. The array substrate according to claim 4 , wherein,

the light emitting unit is an electroluminescent unit, and the first terminal of the switch unit is electrically connected to an anode of the light emitting unit.

8. The array substrate according to claim 2 , wherein the array substrate further comprises:

an insulating layer located between the light detecting unit and the switch unit;

a planarization layer located between the switch unit and the light emitting unit; and,

a pixel defining layer located on a side of the planarization layer away from the switch unit, wherein the light emitting unit is located in a pixel opening defined by the pixel defining layer.

9. The array substrate according to claim 1 , wherein,

the light detecting unit, the switch unit, and the light emitting unit are sequentially distributed in a direction away from the base substrate, and the array substrate further comprises:

an encapsulation layer located on a side of the light emitting unit away from the base substrate.

10. An assembly for detecting light for use in the array substrate according to claim 1 , wherein the light detecting unit of the array substrate comprises a first electrode, a photosensitive layer, and a second electrode, wherein the assembly for detecting light comprises:

a controlling circuit, configured to control the switch unit to operate in an ON transition region, wherein the ON transition region is a region between an ON region and an OFF region of the switch unit;

a voltage applying circuit, configured to apply a voltage to the first electrode of the light detecting unit, so that the second electrode of the light detecting unit has a potential, wherein the potential of the second electrode changes under the action of the light irradiated to the first electrode, causing an output current of the switch unit to change;

a first determining circuit, configured to determine an amount of change of the output current of the switch unit; and

a second determining circuit, configured to determine an intensity of illumination irradiated to the first electrode based on the amount of change of the output current of the switch unit.

11. The assembly for detecting light according to claim 10 , wherein the light irradiated to the first electrode is light reflected by a fingerprint, and the assembly for detecting light further comprises:

a detecting circuit, configured to perform fingerprint detection based on the amount of change of the output current of a plurality of the switch units.

12. A display device, comprising: the array substrate according to claim 1 .

13. A method for detecting light for use in an array substrate, wherein the array substrate comprises:

a base substrate having a pixel region; and

a light detecting unit, a switch unit, and a light emitting unit that are located in the pixel region, and the light detecting unit and the light emitting unit share the switch unit, the light detecting unit of the array substrate comprises a first electrode, a photosensitive layer, and a second electrode;

wherein the method for detecting light comprises:

controlling the switch unit to operate in an ON transition region, wherein the ON transition region is a region between an ON region and an OFF region of the switch unit;

applying a voltage to the first electrode of the light detecting unit, so that the second electrode of the light detecting unit has a potential, wherein the potential of the second electrode changes under the action of the light irradiated to the first electrode, causing an output current of the switch unit to change;

determining an amount of change of the output current of the switch unit; and

determining an intensity of illumination irradiated to the first electrode based on the amount of change of the output current of the switch unit.

14. The method for detecting light according to claim 13 , wherein,

the light irradiated to the first electrode is light reflected by a fingerprint, and after determining the amount of change of the output current of the switch unit, the method for detecting light further comprises:

performing fingerprint detection based on the amount of change of the output current of a plurality of the switch units.

15. A method for manufacturing an array substrate, comprising:

providing a base substrate having a pixel region;

forming a light detecting unit, a switch unit, and a light emitting unit in the pixel region, wherein the light emitting unit is electrically connected to the switch unit, the light detecting unit is insulated from the switch unit, and a current generated by the light detecting unit under irradiation of light affects an output current of the switch unit, so that the light detecting unit and the light emitting unit share the switch unit.

16. The method for manufacturing the array substrate according to claim 15 , wherein;

forming the light detecting unit, the switch unit, and the light emitting unit in the pixel region so that the light detecting unit and the light emitting unit share the switch unit, comprises:

forming the light detecting unit in the pixel region;

forming the switch unit on a side of the light detecting unit away from a photosensitive side of the light detecting unit, wherein an orthographic projection of the light detecting unit onto the base substrate is at least partially overlapped with an orthographic projection of the switch unit onto the base substrate; and

forming the light emitting unit on a side of the switch unit away from the light detecting unit.

17. The method for manufacturing the array substrate according to claim 16 , wherein,

forming the light detecting unit in the pixel region comprises:

forming a first electrode, a photosensitive layer, and a second electrode in the pixel region, wherein the first electrode, the photosensitive layer, and the second electrode are sequentially stacked in a direction away from the base substrate;

forming the switch unit on the side of the light detecting unit away from the photosensitive side of the light detecting unit comprises:

forming an active layer on the side of the light detecting unit away from the photosensitive side of the light detecting unit; and

forming a control terminal, a first terminal, and a second terminal on a side of the active layer away from the light detecting unit, wherein one of the first terminal and the second terminal is a source, and the other thereof is a drain.

18. The method for manufacturing the array substrate according to claim 16 , wherein,

before forming the switch unit on the side of the light detecting unit away from the photosensitive side of the light detecting unit, the method for manufacturing an array substrate further comprises:

forming an insulating layer on the side of the light detecting unit away from the photosensitive side of the light detecting unit;

forming the switch unit on the side of the light detecting unit away from the photosensitive side of the light detecting unit comprises:

forming the switch unit on a side of the insulating layer away from the light detecting unit.

19. The method for manufacturing the array substrate according to claim 16 , wherein,

before forming the light emitting unit on the side of the switch unit away from the light detecting unit, the method for manufacturing an array substrate further comprises:

forming a planarization layer on the side of the switch unit away from the light detecting unit;

forming the light emitting unit on the side of the switch unit away from the light detecting unit comprises:

forming the light emitting unit on a side of the planarization layer away from the light detecting unit;

the method for manufacturing an array substrate further comprises:

forming a pixel defining layer on the side of the planarization layer away from the switch unit, wherein the light emitting unit is located in a pixel opening defined by the pixel defining layer.

20. The method for manufacturing the array substrate according to claim 15 , wherein the method for manufacturing the array substrate further comprises:

forming an encapsulation layer on a side of the light emitting unit away from the base substrate.