Flexible display substrate, manufacturing method thereof, and display device

Abstract

The present disclosure provides a flexible display substrate, a manufacturing method thereof and an electronic device, and belongs to the field of display devices. The flexible display substrate comprises a display area and a non-display area, and the non-display area is located around the display area. The flexible display substrate has a hollow structure, and the hollow structure located in the display area is different from the hollow structure located in the non-display area. The stretchability of the display area is greater than that of the non-display area. By setting different hollow structures in the display area and the non-display area of the flexible display substrate, the stretchability of the display area is greater than that of the non-display area, so that the main stretch deformation occurs in the display area when the flexible display substrate is stretched, the stretch deformation of the non-display area is reduced, the risk of fracture of the wire located in the non-display area in the flexible display substrate is reduced, and the service life of the flexible display substrate is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the field of display devices, and in particular to a flexible display substrate, a manufacturing method thereof, and a display device. Background Art

[0002] With the development of display technology, flexible display technology continues to mature. In addition to bendable and foldable display substrates, stretchable display substrates are also gradually maturing.

[0003] The stretchable flexible display substrate has a hollow structure, which is located in the display area and non-display area of ​​the flexible display substrate, so that when the flexible display substrate is stretched, both the display area and the non-display area can produce tensile deformation.

[0004] In related technologies, the display and non-display areas of flexible display substrates have the same stretchability. When stretched, the flexible display substrate experiences similar deformation in both the display and non-display areas. During the stretching process, the wiring within the flexible display substrate presents a certain risk of breakage. Furthermore, the non-display area of ​​the flexible display substrate contains a large number of wiring, and significant deformation in the non-display area significantly increases the risk of wiring breakage, making the flexible display substrate susceptible to damage. Summary of the Invention

[0005] The present disclosure provides a flexible display substrate, a manufacturing method thereof, and a display device, which can reduce the risk of wire breakage in the non-display area and extend the service life of the flexible display substrate. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present disclosure provides a flexible display substrate, the flexible display substrate comprising a display area and a non-display area, wherein the non-display area is located around the display area;

[0007] The flexible display substrate has a hollow structure, and the hollow structure in the display area is different from the hollow structure in the non-display area, so that the stretching rate of the display area is greater than the stretching rate of the non-display area.

[0008] Optionally, the hollow structure includes a plurality of through holes, and an area of ​​the through holes located in the display area is larger than an area of ​​the through holes located in the non-display area.

[0009] Optionally, the through hole located in the display area includes at least one of a first through hole, a second through hole, a third through hole and a fourth through hole, and the through hole located in the non-display area includes at least one of a first through hole, a second through hole, a third through hole and a fourth through hole;

[0010] The first through hole includes a first strip-shaped main portion and two trapezoidal portions, the two trapezoidal portions are respectively located at two ends of the first strip-shaped main portion, and the upper base of the trapezoidal portion is connected to the first strip-shaped main portion;

[0011] The second through hole includes a second strip-shaped main portion and two first strip-shaped branch portions, wherein the two first strip-shaped branch portions are respectively located at two ends of the second strip-shaped main portion, and the middle portion of the first strip-shaped branch portion is connected to the second strip-shaped main portion;

[0012] The third through hole includes a third strip-shaped main portion, two second strip-shaped branches, and two third strip-shaped branches. The second strip-shaped branches and the third strip-shaped branches are alternately distributed in the length direction of the third strip-shaped main portion, and one end of each is connected to the third strip-shaped main portion. The two second strip-shaped branches are located on one side of the third strip-shaped main portion, and the two third strip-shaped branches are located on the other side of the third strip-shaped main portion.

[0013] The fourth through hole is in a strip shape.

[0014] Optionally, the trapezoidal portion is an isosceles trapezoid, and an upper base of the trapezoidal portion coincides with a side of the first strip-shaped main body portion.

[0015] Optionally, the length of the first through hole is 350 μm to 450 μm, and the width of the first strip-shaped main body is 5 μm to 30 μm.

[0016] Optionally, the length of the lower base of the trapezoidal portion is 100-150 μm, and the height of the trapezoidal portion is no more than twice the width of the first strip-shaped main body portion.

[0017] Optionally, the length direction of the first strip-shaped branch portion is perpendicular to the length direction of the second strip-shaped main portion, and the first strip-shaped branch portion is symmetrical with respect to the second strip-shaped main portion.

[0018] Optionally, the length of the first strip-shaped branch portion is 100 μm to 150 μm, and the width of the first strip-shaped branch portion is 5 μm to 30 μm.

[0019] Optionally, the length direction of the second strip branch portion and the length direction of the third strip branch portion are both perpendicular to the length direction of the third strip main body portion, and one of the two second strip branches is located at one end of the third strip main body portion, and one of the two third strip branches is located at the other end of the third strip main body portion.

[0020] Optionally, the length of the second strip-shaped branch portion is 50 μm to 75 μm, and the width of the second strip-shaped branch portion is 5 μm to 30 μm; the length and width of the third strip-shaped branch portion are the same as those of the second strip-shaped branch portion.

[0021] Optionally, the first through hole, the second through hole, the third through hole and the fourth through hole are all of the same length, and the first strip-shaped main body portion, the second strip-shaped main body portion, the third strip-shaped main body portion and the fourth through hole are all of the same width;

[0022] The area of ​​the trapezoidal portion is smaller than the area of ​​the first strip-shaped branch portion, and the sum of the areas of the two trapezoidal portions is smaller than the sum of the areas of the two second strip-shaped branch portions and the two third strip-shaped branch portions.

[0023] Optionally, the display area has at least one of the first through hole, the second through hole and the third through hole, and the non-display area has the fourth through hole.

[0024] Optionally, the display area includes at least two sub-areas, and the through holes in adjacent sub-areas have different shapes.

[0025] Optionally, the at least two sub-regions include a first sub-region and a second sub-region, and the first sub-region surrounds the second sub-region.

[0026] Optionally, the flexible display substrate includes multiple island structures and multiple bridge structures, and the multiple island structures are distributed in an array. Adjacent island structures are connected by the bridge structures, and each island structure is connected to four bridge structures respectively. The four bridge structures are respectively connected to different sides of the island structure, and the connection between the bridge structure and the island structure is located at the end of the side.

[0027] In a second aspect, an embodiment of the present disclosure further provides a method for manufacturing a flexible display substrate, the method comprising:

[0028] providing a flexible substrate;

[0029] forming a display functional film layer on the flexible substrate;

[0030] A hollow structure is formed on a flexible substrate having the display function layer formed thereon to obtain a flexible display substrate, wherein the flexible display substrate includes a display area and a non-display area, the non-display area being located around the display area, and the hollow structure located in the display area is different from the hollow structure located in the non-display area, so that the stretching rate of the display area is greater than the stretching rate of the non-display area.

[0031] In a third aspect, an embodiment of the present disclosure further provides a display device, comprising the flexible display substrate as described in the previous aspect.

[0032] The technical scheme provided by the embodiments of the present disclosure has at least the following beneficial effects:

[0033] By setting different hollow structures in the display area and the non-display area of the flexible display substrate, the stretching rate of the display area is greater than that of the non-display area, so that the main stretching deformation occurs in the display area when the flexible display substrate is stretched, the stretching deformation of the non-display area is reduced, the risk of fracture of the wire in the non-display area in the flexible display substrate is reduced, and the service life of the flexible display substrate is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a structural schematic diagram of a flexible display substrate provided by an embodiment of the present disclosure;

[0036] Figure 2 is a structural schematic diagram of a first via provided by an embodiment of the present disclosure;

[0037] Figure 3 is a structural schematic diagram of a second via provided by an embodiment of the present disclosure;

[0038] Figure 4 is a structural schematic diagram of a third via provided by an embodiment of the present disclosure;

[0039] Figure 5 is a structural schematic diagram of a fourth via provided by an embodiment of the present disclosure;

[0040] Figure 6 is a partial structural schematic diagram of a ball-top sound box provided by an embodiment of the present disclosure;

[0041] Figure 7 is a structural schematic diagram of a flexible display substrate provided by an embodiment of the present disclosure;

[0042] Figure 8 is a partial structural schematic diagram of a flexible display substrate provided by an embodiment of the present disclosure;

[0043] Figure 9 is a flow chart of a manufacturing method of a flexible display substrate provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0045] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words “first”, “second”, “third” and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “a” or “an” do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as “include” or “comprise” mean that the elements or objects appearing before “include” or “comprises” include the elements or objects listed after “include” or “comprises” and their equivalents, and do not exclude other elements or objects. Words such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Figure 1 Schematic diagram of a flexible display substrate provided by an embodiment of the present disclosure. Figure 1 As shown, the flexible display substrate includes a display area 11 and a non-display area 12 , and the non-display area 12 is located around the display area 11 .

[0047] The flexible display substrate has a hollow structure, and the hollow structure in the display area 11 is different from the hollow structure in the non-display area 12 , so that the stretching rate of the display area 11 is greater than that of the non-display area 12 .

[0048] The hollow structure allows the flexible display substrate to deform when stretched, and different hollow structures result in different stretch rates. By providing different hollow structures in the display and non-display areas of the flexible display substrate, the stretch rate of the display area is greater than that of the non-display area. As a result, when the flexible display substrate is stretched, the primary tensile deformation occurs in the display area, minimizing the tensile deformation in the non-display area. This reduces the risk of breakage in the wiring in the non-display area of ​​the flexible display substrate and extends the life of the flexible display substrate.

[0049] like Figure 1 As shown, the hollow structure includes a plurality of through holes 20. In the embodiment of the present disclosure, the hollow structures are different in at least one of the shape and area of ​​the through holes 20.

[0050] In some examples, the area of ​​the through-hole 20 located in the display area 11 is larger than the area of ​​the through-hole 20 located in the non-display area 12 .

[0051] In the embodiment of the present disclosure, the area of ​​the through hole 20 refers to the area of ​​the region enclosed by the inner wall of the through hole 20 on the surface of the flexible display substrate when the flexible display substrate is flattened and not deformed. The area of ​​the through hole 20 will affect the stretchability of the flexible display substrate. For flexible display substrates of the same material, the larger the area of ​​the through hole 20, the greater the stretchability of the flexible display substrate, and the smaller the area of ​​the through hole 20, the smaller the stretchability of the flexible display substrate. By providing a through hole 20 with a larger area in the display area 11 and a through hole 20 with a smaller area in the non-display area 12, the stretchability of the display area 11 is greater than that of the non-display area 12. In this example, the shape of the through hole 20 located in the display area 11 and the shape of the through hole 20 located in the non-display area 12 can be the same or different. For example, both can be strip holes of the same shape.

[0052] In other examples, the shape of the through hole 20 located in the display area 11 is different from the shape of the through hole 20 located in the non-display area 12 .

[0053] The through-hole 20 divides the flexible display substrate into an island structure 31 and a bridge structure 32. In the display area, the island structure 31 includes a flexible substrate and a light-emitting device located on the flexible substrate. The light-emitting device can be an organic light-emitting diode. The bridge structure 32 includes a flexible substrate and a trace located on the flexible substrate. In a flexible display substrate, the light-emitting devices are usually distributed in an array, which places certain restrictions on the shape of the through-hole 20. The embodiment of the present disclosure provides four through-holes: a first through-hole 21, a second through-hole 22, a third through-hole 23, and a fourth through-hole 24. These four through-holes have different shapes. The through-hole 20 located in the display area 11 includes at least one of the first through-hole 21, the second through-hole 22, the third through-hole 23, and the fourth through-hole 24. The through-hole 20 located in the non-display area 12 includes at least one of the first through-hole 21, the second through-hole 22, the third through-hole 23, and the fourth through-hole 24. And if the area of ​​the through hole 20 located in the display area 11 is different from the area of ​​the through hole 20 located in the non-display area 12, the shapes of the through hole 20 located in the display area 11 and the through hole 20 located in the non-display area 12 may be the same or different; if the area of ​​the through hole 20 located in the display area 11 is the same as the area of ​​the through hole 20 located in the non-display area 12, the shapes of the through hole 20 located in the display area 11 and the through hole 20 located in the non-display area 12 are different.

[0054] Figure 2 Schematic diagram of the structure of a first through hole provided by an embodiment of the present disclosure. Figure 2As shown, the first through hole 21 includes a first strip-shaped main body part 211 and two trapezoidal parts 212, and the two trapezoidal parts 212 are respectively located at two ends of the first strip-shaped main body part 211, and the upper base of the trapezoidal part 212 is connected with one side of the first strip-shaped main body part 211.

[0055] In the embodiments of the present disclosure, the trapezoidal part 212 is isosceles trapezoidal, and the upper base of the trapezoidal part 212 coincides with one side of the first strip-shaped main body part 211.

[0056] The trapezoidal part 212 is set to be isosceles trapezoidal, and the upper base of the trapezoidal part 212 coincides with one side of the first strip-shaped main body part 211, so that the first through hole 21 is not only axisymmetric but also center-symmetric, facilitating the neat arrangement of the first through hole 21 on the flexible display substrate.

[0057] Optionally, the length a1 of the first through hole 21 is 350 μm-450 μm, and the width b1 of the first strip-shaped main body part 211 is 5 μm-30 μm.

[0058] The length a1 of the first through hole 21 and the width b1 of the first strip-shaped main body part 211 affect the stretchability of the flexible display substrate. If the length a1 of the first through hole 21 and the width b1 of the first strip-shaped main body part 211 are set to be larger, the stretchability of the flexible display substrate can be improved, but the structural strength of the flexible display substrate will be reduced, and the number of island structures 31 in a unit area will be reduced, thereby reducing the number of light emitting devices in a unit area of the flexible display substrate and reducing the display effect. The length a1 of the first through hole 21 and the width b1 of the first strip-shaped main body part 211 are determined by comprehensively considering the stretchability, structural strength and display effect of the flexible display substrate.

[0059] The through hole 20 is located between adjacent island structures 31, and if the width of the through hole 20 is too large, the distance between the island structures 31 will be increased. In order to reduce the distance between the island structures 31 and ensure the area of the first through hole 21, the ratio of the length a1 of the first through hole 21 to the width b1 of the first strip-shaped main body part 211 is not less than 10.

[0060] In some examples, the length of the lower base c1 of the trapezoidal part 212 is 100-150 μm, and the height d1 of the trapezoidal part 212 is not more than twice the width b1 of the first strip-shaped main body part 211. The trapezoidal part 212 is set to have a larger width at the end position of the first through hole 21, so that the stretchability of the flexible display substrate can be increased without increasing the distance between adjacent island structures 31. If the trapezoidal part 212 is set to be too large, the structural strength of the flexible display substrate will be reduced. The length of the lower base c1 of the trapezoidal part 212 and the height d1 of the trapezoidal part 212 are determined by comprehensively considering the stretchability and structural strength of the flexible display substrate.

[0061] Figure 3is a structural schematic view of a second via hole provided by an embodiment of the present disclosure. As shown in Figure 3 The second via hole 22 includes a second strip-shaped main body part 221 and two first strip-shaped branch parts 222. The two first strip-shaped branch parts 222 are respectively located at two ends of the second strip-shaped main body part 221, and the middle part of the first strip-shaped branch part 222 is connected with the second strip-shaped main body part 221.

[0062] The second via hole 22 is different from the first via hole 21 in that the shape of the end part of the via hole is different. The first strip-shaped branch part 222 is arranged at the end part of the second strip-shaped main body part 221, and the first strip-shaped branch part 222 can also play the same role as the trapezoidal part 212, that is, increasing the stretchability of the flexible display substrate.

[0063] As shown in Figure 3 The length direction of the first strip-shaped branch part 222 is perpendicular to the length direction of the second strip-shaped main body part 221, and the first strip-shaped branch part 222 is symmetrical about the second strip-shaped main body part 221.

[0064] The first strip-shaped branch part 222 is arranged perpendicularly to the second strip-shaped main body part 221, and the first strip-shaped branch part 222 is symmetrical about the second strip-shaped main body part 221, so that the second via hole 22 is not only axisymmetric but also center-symmetric, which facilitates the neat arrangement of the second via hole 22 on the flexible display substrate.

[0065] Optionally, the length a2 of the second via hole 22 is 350 μm-450 μm, and the width b2 of the second strip-shaped main body part 221 is 5 μm-30 μm.

[0066] Similarly to the first via hole 21, the length a2 of the second via hole 22 and the width b2 of the second strip-shaped main body part 221 also affect the stretchability of the flexible display substrate. If the length a2 of the second via hole 22 and the width b2 of the second strip-shaped main body part 221 are set to be larger, the stretchability of the flexible display substrate can be improved, but the structural strength of the flexible display substrate will be reduced, and the number of island structures 31 in a unit area will be reduced, thereby reducing the number of light emitting devices in a unit area of the flexible display substrate and reducing the display effect. By comprehensively considering the stretchability, structural strength and display effect of the flexible display substrate, the length a2 of the second via hole 22 and the width b2 of the second strip-shaped main body part 221 are determined.

[0067] In the embodiment of the present disclosure, the length a2 of the second via hole 22 and the width b2 of the second strip-shaped main body part 221 are consistent with the length a1 of the first via hole 21 and the width b1 of the first strip-shaped main body part 211.

[0068] Optionally, the length c2 of the first strip-shaped branch part 222 is 100 μm-150 μm, and the width d2 of the first strip-shaped branch part 222 is 5 μm-30 μm.

[0069] The first strip-shaped branch portion 222 is provided so that the end portion of the second through hole 22 has a larger width, which can increase the stretching rate of the flexible display substrate without increasing the interval between adjacent island structures 31 .

[0070] In the embodiment of the present disclosure, the width d2 of the first strip-shaped branch portion 222 is the same as the width b2 of the second strip-shaped main portion 221. In other examples, the width d2 of the first strip-shaped branch portion 222 and the width b2 of the second strip-shaped main portion 221 may also be different. For example, the width d2 of the first strip-shaped branch portion 222 may be greater than the width b2 of the second strip-shaped main portion 221; or the width d2 of the first strip-shaped branch portion 222 may be less than the width b2 of the second strip-shaped main portion 221.

[0071] Figure 4 Schematic diagram of the structure of a third through hole provided by the embodiment of the present disclosure. Figure 4 As shown, the third through hole 23 includes a third strip-shaped main portion 231, two second strip-shaped branches 232, and two third strip-shaped branches 233. The second strip-shaped branches 232 and the third strip-shaped branches 233 are alternately distributed along the length direction of the third strip-shaped main portion 231, and one end of each is connected to the third strip-shaped main portion 231. The two second strip-shaped branches 232 are located on one side of the third strip-shaped main portion 231, and the two third strip-shaped branches 233 are located on the other side of the third strip-shaped main portion 231.

[0072] The third through hole 23 differs from the second through hole 22 in the arrangement of the strip-shaped branches. The third through hole 23 includes four strip-shaped branches, which are alternately arranged on either side of the third strip-shaped main portion 231. Although the arrangement is different, the addition of the strip-shaped branches can also increase the stretchability of the flexible display substrate.

[0073] like Figure 4 As shown, the length direction of the second strip-shaped branch portion 232 and the length direction of the third strip-shaped branch portion 233 are both perpendicular to the length direction of the third strip-shaped main portion 231. One of the two second strip-shaped branch portions 232 is located at one end of the third strip-shaped main portion 231, and one of the two third strip-shaped branch portions 233 is located at the other end of the third strip-shaped main portion 231.

[0074] The third through hole 23 composed of the third strip-shaped main portion 231, two second strip-shaped branch portions 232 and two third strip-shaped branch portions 233 is not an axisymmetric structure, but it is also an axisymmetric structure, which can also facilitate the third through holes 23 to be arranged in a neat periodic structure on the flexible display substrate.

[0075] Optionally, the length a3 of the third through hole 23 is 350 μm to 450 μm, and the width b3 of the third strip-shaped main body portion 231 is 5 μm to 30 μm.

[0076] Similar to the first through hole 21, the length a3 of the third through hole 23 and the width b3 of the third strip-shaped main portion 231 also affect the stretchability of the flexible display substrate. Larger length a3 of the third through hole 23 and width b3 of the third strip-shaped main portion 231 can increase the stretchability of the flexible display substrate, but this also reduces the structural strength of the flexible display substrate and reduces the number of island structures 31 per unit area, thereby reducing the number of light-emitting devices per unit area in the flexible display substrate and reducing the display quality. The length a3 of the third through hole 23 and the width b3 of the third strip-shaped main portion 231 are determined by comprehensively considering the stretchability, structural strength, and display quality of the flexible display substrate.

[0077] In the embodiment of the present disclosure, the length a3 of the third through hole 23 and the width b3 of the third strip-shaped main portion 231 are consistent with the length a1 of the first through hole 21 and the width b1 of the first strip-shaped main portion 211 .

[0078] Optionally, the length c3 of the second strip-shaped branch portion 232 is 50 μm to 75 μm, the width d3 of the second strip-shaped branch portion 232 is 5 μm to 30 μm, and the length e3 and width f3 of the third strip-shaped branch portion 233 are the same as those of the second strip-shaped branch portion 232 .

[0079] The second strip-shaped branch portion 232 is provided so that a local position of the third through hole 23 has a larger width, which can increase the stretching rate of the flexible display substrate without increasing the interval between adjacent island structures 31 .

[0080] In the embodiment of the present disclosure, the width d3 of the second strip-shaped branch portion 232 is the same as the width f3 of the third strip-shaped main portion 231. In other examples, the width d3 of the second strip-shaped branch portion 232 and the width f3 of the third strip-shaped main portion 231 may also be different. For example, the width d3 of the second strip-shaped branch portion 232 may be greater than the width f3 of the third strip-shaped main portion 231; or the width d3 of the second strip-shaped branch portion 232 may be less than the width f3 of the third strip-shaped main portion 231.

[0081] Figure 5 Schematic diagram of the structure of a fourth through hole provided by the embodiment of the present disclosure. Figure 5 As shown, the fourth through hole 24 is in a strip shape. The strip-shaped through hole has a simple structure. The strip-shaped through hole is not only axially symmetrical but also centrally symmetrical, which makes it easy to arrange them neatly on the flexible display substrate.

[0082] Optionally, the length a4 of the fourth through hole 24 is 350 μm to 450 μm, and the width b4 of the fourth through hole 24 is 5 μm to 30 μm.

[0083] The length a4 and width b4 of the fourth through hole 24 also affect the stretchability of the flexible display substrate. Larger length a4 and width b4 of the fourth through hole 24 can increase the stretchability of the flexible display substrate, but this also reduces the structural strength of the flexible display substrate and reduces the number of island structures 31 per unit area. This reduces the number of light-emitting devices that can be arranged per unit area of ​​the flexible display substrate, thereby reducing the display quality. The length a4 and width b4 of the fourth through hole 24 are determined by comprehensively considering the stretchability, structural strength, and display quality of the flexible display substrate.

[0084] In some examples, the first through hole 21, the second through hole 22, the third through hole 23, and the fourth through hole 24 are all of the same length, and the first strip-shaped main portion 211, the second strip-shaped main portion 221, the third strip-shaped main portion 231, and the fourth through hole 24 are all of the same width. Because the first through hole 21 also includes two trapezoidal portions 212, the second through hole 22 also includes two first strip-shaped branch portions 222, and the third through hole 23 also includes two second strip-shaped branch portions 232 and two third strip-shaped branch portions 233, the area of ​​the first through hole 21, the area of ​​the second through hole 22, and the area of ​​the third through hole 23 are all larger than the area of ​​the fourth through hole 24. When arranging the hollow structure, at least one of the first through hole 21, the second through hole 22, and the third through hole 23 can be arranged in the display area 11, and the fourth through hole 24 can be arranged in the non-display area, so that the area of ​​the through hole 20 located in the display area 11 is larger than the area of ​​the through hole 20 located in the non-display area 12. The fourth through hole 24 has the smallest area and is arranged in the non-display area 12 , which has little impact on the layout of the wiring.

[0085] Optionally, the area of ​​the trapezoidal portion 212 is smaller than the area of ​​the first strip-shaped branch portion 222, and the sum of the areas of the two trapezoidal portions 212 is smaller than the sum of the areas of the two second strip-shaped branches 232 and the two third strip-shaped branches 233. This ensures that the area of ​​the first through hole 21 is smaller than that of the second through hole 22, and smaller than that of the third through hole 23. When arranging the hollowing pattern, at least one of the second through hole 22 and the third through hole 23 can also be arranged in the display area 11, and the first through hole 21 can be arranged in the non-display area 12, without using the fourth through hole 24. This ensures that the area of ​​the first through hole 21 is smaller than that of the second through hole 22, and smaller than that of the third through hole 23.

[0086] As an example, in the disclosed embodiment, the display area 11 has at least one of the first through hole 21, the second through hole 22, and the third through hole 23, and the non-display area 12 has a fourth through hole 24. The fourth through hole 24 has a simple structure, and the stretchability of the flexible display substrate when the fourth through hole 24 is arranged is significantly different from the stretchability of the flexible display substrate when the other through holes are arranged, resulting in a lower stretchability in the non-display area 12 than in the display area 11. The simple structure of the fourth through hole 24 and its placement in the non-display area 12 have minimal impact on the routing of the wiring in the non-display area 12.

[0087] In some examples, the display area 11 includes two sub-areas, and the shapes of the through holes 20 in the two sub-areas are different.

[0088] Arranging through holes 20 of different shapes in the two sub-areas can make the two sub-areas have different stretching rates. In some flexible display substrates, a local position of the display area 11 needs to have a larger stretching rate than other positions. For example, Figure 6 FIG. 1 is a partial structural diagram of a dome speaker provided by an embodiment of the present disclosure. Figure 6 As shown, in the dome speaker, the flexible display substrate 100 is located above the dome structure 200, and the edge of the flexible display substrate 100 is fixed to the fixing member 300. The middle portion of the flexible display substrate 100 is in contact with the dome structure 200, and the middle portion of the display area 11 is lifted by the dome structure 200. Therefore, the center of the display area 11 will produce greater deformation, requiring a greater stretching rate.

[0089] Figure 7 Schematic diagram of a flexible display substrate provided by an embodiment of the present disclosure. Figure 7 As shown, in the embodiment of the present disclosure, the two sub-regions include a first sub-region 111 and a second sub-region 112 , and the first sub-region 111 surrounds the second sub-region 112 .

[0090] When applied to a dome speaker, the stretching rate of the second sub-region 112 is made greater than the stretching rate of the first sub-region 111 , so that the second sub-region 112 can generate a greater stretching deformation.

[0091] Exemplarily, the through-hole in the first sub-region 111 is the first through-hole 21, and the through-hole in the second sub-region 112 is at least one of the second through-hole 22 and the third through-hole 23. The areas of the second through-hole 22 and the third through-hole 23 are both larger than those of the first through-hole 21. Placing the larger second through-hole 22 or third through-hole 23 in the second sub-region 112 allows the second sub-region 112 to have a greater stretchability. Furthermore, the sound-generating area of ​​the dome speaker is also located within the dome structure. Placing the larger through-hole in the second sub-region 112 also facilitates the transmission of sound waves through the through-hole, thus enhancing the sound production of the dome speaker. Under the influence of the dome structure 200, the second sub-region 112 undergoes significant deformation, increasing the spacing between the light-emitting devices in this region of the flexible display substrate and reducing the pixel density. However, the first sub-region 111 undergoes less deformation, maintaining a high pixel density in this region of the flexible display substrate, resulting in a better display effect.

[0092] In other examples, the display area 11 may also include three or more sub-areas, and the shapes of the through holes 20 in adjacent sub-areas are different, so that there are multiple areas with different stretching rates in the display area 11 of the flexible display substrate to meet corresponding product requirements.

[0093] Figure 8 FIG. 1 is a partial structural diagram of a flexible display substrate provided by an embodiment of the present disclosure. Figure 8 As shown, the flexible display substrate includes multiple island structures 31 and multiple bridge structures 32. The multiple island structures 31 are arranged in an array, and adjacent island structures 31 are connected by bridge structures 32. Each island structure 31 is connected to four bridge structures 32. The four bridge structures 32 are respectively connected to different sides of the island structure 31, and the connection between the bridge structure 32 and the island structure 31 is located at the end of the side.

[0094] Through-hole 20 divides the flexible display substrate into an island structure 31 and a bridge structure 32. In the display area, island structure 31 includes a flexible substrate and a light-emitting device located on the flexible substrate, while bridge structure 32 includes a flexible substrate and a trace located on the flexible substrate. Because bridge structure 32 is connected to the end position of the side of island structure 31, and island structure 31 is connected to four bridge structures, when the flexible display substrate is stretched, the tension exerted by bridge structure 32 on island structure 31 acts near the corner of island structure 31. The tension generated by bridge structure 32 on the opposite side of island structure 31 is not collinear, resulting in a non-zero torque exerted by bridge structure 32 on island structure 31. Island structure 31 rotates under the tension of bridge structure 32, which makes the flexible display substrate have a greater stretchability.

[0095] Figure 8 In the description, only the through hole 20 is used as the third through hole 23 as an example. Figure 2 、 Figure 3 and Figure 5It can be seen that even if the through hole 20 is the first through hole 21, the second through hole 22 or the fourth through hole 24, the flexible display substrate still includes a plurality of island structures 31 and a plurality of bridge structures 32. The island structure 31 can also rotate under the pulling force of the bridge structure 32.

[0096] Figure 9 FIG. 1 is a flowchart of a method for manufacturing a flexible display substrate according to an embodiment of the present disclosure. As shown in FIG. 1, the method includes the following steps. Figure 9

[0097] Step S11: providing a flexible substrate.

[0098] Step S12: forming a display functional film layer on the flexible substrate.

[0099] The display functional film layer at least includes light emitting elements and wirings.

[0100] Step S13: forming a hollow structure on the flexible substrate on which the display functional layer is formed, to obtain a flexible display substrate.

[0101] The flexible display substrate includes a display area and a non-display area, the non-display area is located around the display area, and the hollow structure located in the display area is different from the hollow structure located in the non-display area, so that the stretchability of the display area is greater than the stretchability of the non-display area.

[0102] The hollow structure enables the flexible display substrate to produce stretch deformation when stretched, and different hollow structures enable the flexible display substrate to have different stretchabilities. By arranging different hollow structures in the display area and the non-display area of the flexible display substrate, the stretchability of the display area is greater than the stretchability of the non-display area, so that the main stretch deformation occurs in the display area when the flexible display substrate is stretched, the stretch deformation of the non-display area is reduced, the risk of breakage of the wiring located in the non-display area in the flexible display substrate is reduced, and the service life of the flexible display substrate is prolonged.

[0103] Exemplarily, the hollow structure can be formed by a patterning process. The hollow structure penetrates the display functional layer and the flexible substrate.

[0104] Optionally, before step S13, the method further includes forming an encapsulation layer.

[0105] The encapsulation layer covers the display functional film layer to provide protection for the display functional film layer. Exemplarily, the encapsulation layer is an organic encapsulation layer or an inorganic encapsulation layer. The organic encapsulation layer can be an optical adhesive layer, for example, a positive photoresist or a negative photoresist. The inorganic encapsulation layer can be a silicon oxide layer or a silicon nitride layer.

[0106] The present disclosure further provides a display device, which includes Figures 1-8 ​Any of the flexible display substrates shown. For example, the display device can be, but is not limited to, a dome speaker or a special-shaped display.

[0107] The hollow structure allows the flexible display substrate to deform when stretched, and different hollow structures result in different stretch rates. By providing different hollow structures in the display and non-display areas of the flexible display substrate, the stretch rate of the display area is greater than that of the non-display area. As a result, when the flexible display substrate is stretched, the primary tensile deformation occurs in the display area, minimizing the tensile deformation in the non-display area. This reduces the risk of breakage in the wiring in the non-display area of ​​the flexible display substrate and extends the life of the flexible display substrate.

[0108] The above description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A flexible display substrate, characterized in that: The flexible display substrate comprises a display area (11) and a non-display area (12), wherein the non-display area (12) is located around the display area (11); The flexible display substrate has a hollow structure, and the hollow structure located in the display area (11) is different from the hollow structure located in the non-display area (12). The hollow structure includes a plurality of through holes (20), and the area of ​​the through holes (20) located in the display area (11) is larger than the area of ​​the through holes (20) located in the non-display area (12), so that the stretching rate of the display area (11) is greater than the stretching rate of the non-display area (12).

2. The flexible display substrate according to claim 1, wherein: The shape of the through hole (20) located in the display area (11) is different from the shape of the through hole (20) located in the non-display area (12).

3. The flexible display substrate according to claim 2, wherein: The through hole (20) located in the display area (11) includes at least one of a first through hole (21), a second through hole (22), a third through hole (23) and a fourth through hole (24); and the through hole (20) located in the non-display area (12) includes at least one of a first through hole (21), a second through hole (22), a third through hole (23) and a fourth through hole (24); The first through hole (21) comprises a first strip-shaped main body portion (211) and two trapezoidal portions (212), the two trapezoidal portions (212) being respectively located at two ends of the first strip-shaped main body portion (211), and the upper bases of the trapezoidal portions (212) being connected to the first strip-shaped main body portion (211); The second through hole (22) comprises a second strip-shaped main body portion (221) and two first strip-shaped branch portions (222), the two first strip-shaped branch portions (222) being respectively located at two ends of the second strip-shaped main body portion (221), and the middle portion of the first strip-shaped branch portion (222) being connected to the second strip-shaped main body portion (221); The third through hole (23) comprises a third strip-shaped main body (231), two second strip-shaped branch parts (232) and two third strip-shaped branch parts (233), wherein the second strip-shaped branch parts (232) and the third strip-shaped branch parts (233) are alternately distributed in the length direction of the third strip-shaped main body (231), and one end of each is connected to the third strip-shaped main body (231), the two second strip-shaped branch parts (232) are located on one side of the third strip-shaped main body (231), and the two third strip-shaped branch parts (233) are located on the other side of the third strip-shaped main body (231); The fourth through hole (24) is in a strip shape.

4. The flexible display substrate according to claim 3, wherein: The trapezoidal portion (212) is an isosceles trapezoid, and the upper base of the trapezoidal portion (212) coincides with one side of the first strip-shaped main body portion (211).

5. The flexible display substrate according to claim 4, wherein: The length (a1) of the first through hole (21) is 350 μm to 450 μm, and the width (b1) of the first strip-shaped main body (211) is 5 μm to 30 μm.

6. The flexible display substrate according to claim 4, wherein: The length (c1) of the lower base of the trapezoidal portion (212) is 100-150 μm, and the height (d1) of the trapezoidal portion (212) does not exceed twice the width (b1) of the first strip-shaped main body portion (211).

7. The flexible display substrate according to claim 3, wherein: The length direction of the first strip-shaped branch portion (222) is perpendicular to the length direction of the second strip-shaped main portion (221), and the first strip-shaped branch portion (222) is symmetrical with respect to the second strip-shaped main portion (221).

8. The flexible display substrate according to claim 7, wherein: The length (c2) of the first strip-shaped branch portion (222) is 100 μm to 150 μm, and the width (d2) of the first strip-shaped branch portion (222) is 5 μm to 30 μm.

9. The flexible display substrate according to claim 3, wherein: The length direction of the second strip-shaped branch portion (232) and the length direction of the third strip-shaped branch portion (233) are both perpendicular to the length direction of the third strip-shaped main portion (231), and one of the two second strip-shaped branch portions (232) is located at one end of the third strip-shaped main portion (231), and one of the two third strip-shaped branch portions (233) is located at the other end of the third strip-shaped main portion (231).

10. The flexible display substrate according to claim 9, wherein: The length (c3) of the second strip-shaped branch portion (232) is 50 μm to 75 μm, and the width (d3) of the second strip-shaped branch portion (232) is 5 μm to 30 μm; the length (e3) and width (f3) of the third strip-shaped branch portion (233) are the same as those of the second strip-shaped branch portion (232).

11. The flexible display substrate according to any one of claims 3 to 10, characterized in that: The first through hole (21), the second through hole (22), the third through hole (23) and the fourth through hole (24) are all of the same length, and the first strip-shaped main body portion (211), the second strip-shaped main body portion (221), the third strip-shaped main body portion (231) and the fourth through hole (24) are all of the same width; The area of ​​the trapezoidal portion (212) is smaller than the area of ​​the first strip-shaped branch portion (222), and the sum of the areas of the two trapezoidal portions (212) is smaller than the sum of the areas of the two second strip-shaped branch portions (232) and the two third strip-shaped branch portions (233).

12. The flexible display substrate according to any one of claims 3 to 10, characterized in that: The display area (11) has at least one of the first through hole (21), the second through hole (22) and the third through hole (23), and the non-display area (12) has the fourth through hole (24).

13. The flexible display substrate according to claim 12, wherein: The display area (11) comprises at least two sub-areas, and the shapes of the through holes (20) in adjacent sub-areas are different.

14. The flexible display substrate according to claim 13, wherein: The at least two sub-regions include a first sub-region (111) and a second sub-region (112), and the first sub-region (111) surrounds the second sub-region (112).

15. The flexible display substrate according to any one of claims 1 to 10, 13 and 14, characterized in that: The flexible display substrate comprises a plurality of island structures (31) and a plurality of bridge structures (32), wherein the plurality of island structures (31) are distributed in an array, and adjacent island structures (31) are connected via the bridge structures (32), and each island structure (31) is respectively connected to four bridge structures (32), and the four bridge structures (32) are respectively connected to different sides of the island structure (31), and the connection between the bridge structure (32) and the island structure (31) is located at the end of the side.

16. A method for manufacturing a flexible display substrate, characterized in that: The method comprises: providing a flexible substrate; forming a display functional film layer on the flexible substrate; A hollow structure is formed on a flexible substrate having the display functional film layer formed thereon to obtain a flexible display substrate, wherein the flexible display substrate includes a display area and a non-display area, the non-display area being located around the display area, and the hollow structure located in the display area is different from the hollow structure located in the non-display area, the hollow structure includes a plurality of through holes, and the area of ​​the through holes located in the display area is larger than the area of ​​the through holes located in the non-display area, so that the stretching rate of the display area is greater than the stretching rate of the non-display area.

17. A display device, characterized in that: The flexible display substrate comprises the flexible display substrate according to any one of claims 1 to 15.

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