Display substrate and display device in which difference in deformation between central and peripheral portions of display region is eliminated during stretch or compression
A display substrate and a display device are provided. The display substrate includes a base layer that includes at least a display region. The display region includes a plurality of opening regions, and each of the plurality of opening regions includes a plurality of islands spaced apart from each other by a plurality of openings and connected to each other by a plurality of bridges. At least two of the plurality of opening regions have different elastic moduli.
1. A display substrate, comprising a base layer that comprises at least a display region, wherein the display region comprises a plurality of opening regions, each of the plurality of opening regions comprises a plurality of islands spaced apart from each other by a plurality of openings and connected to each other by a plurality of bridges, and at least two of the plurality of opening regions have different stiffnesses.
2. The display substrate according to claim 1 , wherein the plurality of opening regions have different stiffnesses.
3. The display substrate according to claim 2 , wherein the plurality of opening regions comprise a first opening region and a second opening region that are arranged alternately, the first opening region has a first stiffness, the second opening region has a second stiffness, and the first stiffness is not equal to the second stiffness.
4. The display substrate according to claim 1 , wherein each of the plurality of openings is a rectangle, each of the plurality of bridges is a rectangle, and each of the plurality of islands is a rectangle.
5. The display substrate according to claim 4 , wherein in adjacent two of the plurality of opening regions, the islands have a same size, and the bridges between adjacent ones of the islands have different lengths.
6. The display substrate according to claim 4 , wherein in adjacent two of the plurality of opening regions, the islands have different sizes, and the bridges between adjacent ones of the islands have different lengths.
7. The display substrate according to claim 4 , wherein in the opening regions having a same stiffness, the islands have a same size, and the bridges between adjacent ones of the islands have a same length.
8. The display substrate according to claim 4 , wherein in adjacent two of the plurality of opening regions, an area of each opening of the opening region having a larger stiffness, is smaller than an area of each opening of the opening region having a smaller stiffness.
9. The display substrate according to claim 1 , wherein each island is defined by four openings of the plurality of openings and four bridges of the plurality of bridges, and each of the four bridges is at one end of a respective one of the four openings and at four corners of the island.
10. The display substrate according to claim 9 , wherein a width of each bridge is equal to a width of the opening at one end of which the bridge is located and less than a width of the island adjacent to the bridge, and a length of the bridge is at least a width of one wire.
11. The display substrate according to claim 1 , wherein the base layer further comprises non-display regions at both sides of the display region, respectively, each non-display region comprises a transition region adjacent to the display region, and a stiffness of the transition region is greater than that of the display region and less than that of another region of the non-display region other than the transition region.
12. The display substrate according to claim 11 , wherein the stiffness of the transition region increases in a direction from the display region to the another region of the non-display region.
13. The display substrate according to claim 11 , wherein the transition region comprises a plurality of auxiliary islands spaced apart from each other by a plurality of auxiliary openings and connected to each other by a plurality of auxiliary bridges, and a distance between adjacent two of the auxiliary islands is different from a distance between adjacent two of the islands.
14. The display substrate according to claim 13 , wherein a shape of each of the auxiliary islands is the same as a shape of each of the islands.
15. The display substrate according to claim 3 , wherein each of two outermost opening regions respectively at two opposite sides of the plurality of opening regions is the second opening region, and the second stiffness is less than the first stiffness.
16. The display substrate according to claim 15 , wherein the second stiffness is 70% to 99% of the first stiffness.
17. The display substrate according to claim 13 , further comprising an auxiliary film on each transition region, wherein the auxiliary film has a thickness increasing in a direction from the display region to the other region of the non-display region comprising the transition region.
18. The display substrate according to claim 17 , wherein a material of the auxiliary film comprises at least one of silicon nitride, silicon oxide, polyimide, and a metal of titanium.
19. A display device, comprising:
the display substrate according to claim 1 ;
light emitting devices on at least a portion of the plurality of islands, respectively; and
wires respectively on at least a portion of the plurality of bridges for connection to the light emitting devices.
20. The display substrate according to claim 2 , wherein each island is defined by four openings of the plurality of openings and four bridges of the plurality of bridges, and each of the four bridges is at one end of a respective one of the four openings and at four corners of the island.