Display substrate and display device

1. A display substrate, comprising:

a substrate;

a plurality of pixel units on the substrate, each of the plurality of pixel units having a light-emitting device therein;

a power supply electrode configured to supply a power supply voltage to the light-emitting device,

wherein the power supply electrode comprises a first electrode layer and a second electrode layer,

the second electrode layer has a mesh-shaped structure and is coupled to the first electrode layer through a via hole, and

the first electrode layer comprises a plurality of first electrode parts spaced apart from each other and each having a block shape, each of the plurality of first electrode parts being electrically coupled to a plurality of light-emitting devices and configured to supply the power supply voltage to the plurality of light-emitting devices,

wherein the plurality of first electrode parts are arranged in an array and cover the plurality of pixel units, and

wherein the display substrate further comprises at least one switch element, and each of the at least one switch element couples two first electrode parts of the plurality of first electrode parts which are adjacent and separated from each other.

2. The display substrate of claim 1 , wherein each switch element comprises a first switch transistor,

when viewed in a plan view, a first electrode of the first switch transistor is directly coupled to one of two adjacent first electrode parts, the other of the two adjacent first electrode parts is directly coupled to a second electrode of the first switch transistor, and a control electrode of the first switch transistor is coupled to a driving chip so as to control on/off state of the first switch transistor through the driving chip.

3. The display substrate of claim 2 , wherein each of the plurality of pixel units further comprises a driving transistor therein, wherein

the first electrode part is coupled to a first electrode of the driving transistor in the pixel unit through the second electrode layer.

4. The display substrate of claim 3 , wherein the first electrode and a second electrode of the driving transistor, the first electrode and the second electrode of the first switch transistor, and the second electrode layer in a same layer and made of a same material, and

an interlayer insulating layer is between the first electrode layer and the second electrode layer; and the first electrode part is coupled to the second electrode layer through the via hole penetrating the interlayer insulating layer.

5. The display substrate of claim 3 , wherein the driving transistor has the same switch characteristics as the first switch transistor.

6. The display substrate of claim 3 , wherein the driving transistor is a P-type transistor, and the first electrode part is an electrode applying the power supply voltage to an anode of the light-emitting device.

7. The display substrate of claim 3 , wherein the driving transistor is an N-type transistor, and the first electrode part is an electrode applying the power supply voltage to a cathode of the light-emitting device.

8. The display substrate of claim 1 , wherein the first electrode part comprises a Ti/Al/Ti composite film layer.

9. The display substrate of claim 1 , wherein an orthogonal projection of each of the plurality of first electrode parts on the substrate overlaps with orthogonal projections of multiple pixel units on the substrate.

10. The display substrate of claim 1 , wherein the first electrode part has a length and a width both less than 5 inches.

11. The display substrate of claim 1 , wherein the light-emitting device comprises Micro LED or mini LED.

12. A driving method of a display substrate, which is used for driving the display substrate of claim 1 to display, wherein the at least one switch element is in an on state during display of the display substrate.

13. A display device, comprising the display substrate of claim 1 .