Display substrate, display device and method for manufacturing display substrate

1. A display substrate, comprising:

a plurality of bearing parts for supporting display assemblies; and

a connecting beam located between two bearing parts and connected to the two bearing parts,

wherein the connecting beam comprises at least one stretchable portion with a hollow portion provided inside the stretchable portion, so that the stretchable portion is deformable in a first direction and a second direction, and the second direction is perpendicular to the first direction;

wherein the stretchable portion has a substantially rhombus shape in the cross section parallel to the display substrate, and two diagonal lines of the rhombus are parallel to the first direction and the second direction, respectively; and

wherein the rhombus shape formed by the stretchable portion has a first diagonal line and a second diagonal line, the first diagonal line is parallel to the first direction, and the second diagonal line is parallel to the second direction; the rhombus shape formed by the stretchable portion has a first included angle and a second included angle, and the first included angle is greater than or equal to the second included angle;

the stretchable portion is switchable among a stretched state, a compressed state, and an initial state;

when the stretchable portion is switched from the initial state to the stretched state, the first diagonal line is extended and the second diagonal line is shortened; when the stretchable portion is switched from the initial state to the compressed state, the second diagonal line is extended and the first diagonal line is shortened; when the stretchable portion is in the initial state, the first included angle is greater than or equal to 90 degrees and less than or equal to 150 degrees, and the second included angle is greater than or equal to 30 degrees and less than or equal to 90 degrees.

2. The display substrate according to claim 1 , wherein the stretchable portion has a substantially ellipse shape in a cross section parallel to the display substrate, a major axis of the ellipse shape is parallel to the first direction, and a minor axis of the ellipse shape is parallel to the second direction.

3. The display substrate according to claim 1 , wherein the connecting beam is smoothly transited to the bearing parts.

4. The display substrate according to claim 1 , wherein adjacent wall surfaces of the stretchable portion are smoothly connected.

5. The display substrate according to claim 1 , wherein the display substrate comprises a plurality of the connecting beams, and two adjacent bearing parts are connected by the plurality of the connecting beams.

6. The display substrate according to claim 1 , wherein the connecting beam comprises a plurality of the stretchable portions, and two adjacent stretchable portions are connected to each other.

7. The display substrate according to claim 6 , wherein the plurality of the stretchable portions are distributed in an array, rows of the array are parallel to the first direction, and columns of the array are parallel to the second direction.

8. The display substrate according to claim 6 , wherein the plurality of the stretchable portions comprise a plurality of rows of stretchable portions arranged in the second direction, and adjacent rows of stretchable portions are misaligned.

9. The display substrate according to claim 1 , wherein a ratio of a size of the connecting beam to a size of the bearing parts in the first direction or the second direction is greater than or equal to 1/10 and less than or equal to ¼.

10. The display substrate according to claim 1 , wherein a width of a wall surface of the stretchable portion is greater than or equal to 5 micrometers and less than or equal to 20 micrometers.

11. The display substrate according to claim 1 , wherein the connecting beam and the bearing parts are formed of polyimide.

12. The display substrate according to claim 1 , wherein a passivation layer and an electrical conductor both extend in the bearing parts and the connecting beam.

13. A display device, comprising a display panel and the display substrate according to claim 1 , wherein the display panel is disposed above the display substrate, and the display panel comprises a plurality of display assemblies disposed above the bearing parts.

14. A method for manufacturing the display substrate according to claim 1 , comprising:

depositing a first base portion on a glass substrate;

depositing a first passivation layer on the first base portion;

depositing an electrical conductor on the first passivation layer;

depositing a second passivation layer on the electrical conductor;

depositing a second base portion, the second base portion covering the second passivation layer, the electrical conductor and the first passivation layer, and the second base portion covering the first base portion; and

performing a patterning process to the second base portion and the first base portion, the first base portion, the first passivation layer, the electrical conductor, the second passivation layer and the second base portion forming the connecting beam and the bearing parts.