Support, manufacturing method therefor, and foldable display device

Abstract

Provided is a support, which belongs to the technical field of display. A support (1) comprises a support layer (11) and an isolation layer (12) on a first surface (D) of the support layer (11). The support layer (11) has a first planar region (C1), a bending region (A) and a second planar region (C2) connected in sequence in a first direction (x), the direction of length of the bending region (A) being a second direction (y), and the second direction (y) intersecting the first direction (x). The support layer (11) comprises a plurality of hollowed-out structures (111) located in the bending region (A). The isolation layer (12) is located in the first planar region (C1), the bending region (A) and the second planar region (C2), and the isolation layer (12) covers the bending region (A). The isolation layer (12 ) has a modulus of 10 GPa to 250 GPa, and the thickness of the isolation layer (12) is smaller than that of the support layer (11). The problem of imprinting in the bending region (A) caused by the hollowed-out structures (111) of the support layer (11) can be alleviated, and the problem of the reduction in surface flatness of a foldable display device due to creases caused by creep deformation after a plurality of polymer material layers in the foldable display device are bent multiple times can also be alleviated.

Description

Support member and manufacturing method thereof, and foldable display device Technical Field

[0001] The embodiments of the present disclosure relate to the field of display technology, and in particular to a support member and a manufacturing method thereof, and a foldable display device. Background Art

[0002] Foldable display devices have a wide range of applications in daily life, such as in electronic devices such as mobile phones and tablet computers. Foldable display devices generally include a stacked support member and a display panel.

[0003] In related art, a foldable support member comprises a stacked support layer and an isolation layer. The support layer comprises a first planar region, a bend region, and a second planar region, which are connected in sequence. The support layer has a hollow structure in the bend region. The isolation layer is located in the bend region and is a solid layer structure. It is used to prevent the hollow structure of the support layer in the bend region from being too close to the display panel, resulting in stenciling. The isolation layer is made of a polymer material.

[0004] However, since the isolation layer and part of the film layer in the display panel are made of polymer materials, after being bent multiple times, the polymer material layer will creep, resulting in creases in the bending area, resulting in a decrease in surface flatness.

[0005] Summary of the Invention

[0006] The present disclosure provides a foldable support member, a method for manufacturing the same, and a foldable display device, which can alleviate the problem of multiple polymer material layers in a foldable display device creeping after repeated bending, resulting in creases and, in turn, a decrease in the surface flatness of the foldable display device. The technical solution is as follows:

[0007] On the one hand, a support member is provided, which includes a support layer and an isolation layer on a first surface of the support layer; the support layer has a first plane area, a bending area, and a second plane area connected in sequence in a first direction, the length direction of the bending area is a second direction, the second direction intersects with the first direction, and the support layer includes a plurality of hollow structures located in the bending area; the isolation layer is located in the first plane area, the bending area and the second plane area, and the isolation layer covers the bending area; the modulus of the isolation layer is 10GPa~250GPa, and the thickness of the isolation layer is less than the thickness of the support layer.

[0008] Optionally, the support member further includes a first transition zone and a second transition zone, the first transition zone is located between the first plane zone and the bending zone, and the second transition zone is located between the bending zone and the second plane zone; the isolation layer is also located in the first transition zone and the second transition zone, and the isolation layer located in the first transition zone and the isolation layer located in the second transition zone respectively have a first recessed pattern.

[0009] Optionally, the first concave pattern includes a first stripe groove, a size of the first stripe groove in the second direction is the same as a size of the isolation layer in the second direction, and a depth of the first stripe groove is less than or equal to a thickness of the isolation layer.

[0010] Optionally, the first recessed pattern includes a first strip groove and the length direction of the first strip groove is the second direction, the size of the first strip groove in the second direction is smaller than the size of the isolation layer in the second direction, and the depth of the first strip groove is the same as the thickness of the isolation layer.

[0011] Optionally, the first concave pattern includes a plurality of first strip-shaped grooves arranged along the second direction, and the length direction of the first strip-shaped grooves is the second direction.

[0012] Optionally, in the first direction, the first concave pattern has a first reference point closest to the bending area, and a second reference point farthest from the bending area, and the distance between the first reference point and the second reference point is 5 μm to 100 μm.

[0013] Optionally, the first recessed pattern includes a plurality of first recessed structure groups, the plurality of first recessed structure groups are arranged along the first direction, and each of the first recessed structure groups includes a plurality of first recessed structures arranged along the second direction, and the length direction of the first recessed structure is the second direction.

[0014] Optionally, the multiple first recessed structure groups include a first target recessed structure group and a second target recessed structure group, the first target recessed structure group and the second target recessed structure group are adjacent and the first target recessed structure group is located on the side of the second target recessed structure group away from the bending zone; the first recessed structure is a first strip groove, and the orthographic projections of two adjacent first strip grooves in the second target recessed structure group on the reference surface respectively coincide with the orthographic projections of the first strip groove in the first target recessed structure group on the reference surface, and the reference surface is perpendicular to the first surface and parallel to the second direction.

[0015] Optionally, the first target concave structure group and the second target concave structure group satisfy at least one of the following relationships: the number of first strip grooves in the first target concave structure group is less than or equal to the number of first strip grooves in the second target concave structure group; the depth of the first strip grooves in the first target concave structure group is less than or equal to the depth of the first strip grooves in the second target concave structure group; in the first direction, the size of the first strip grooves in the first target concave structure group is less than or equal to the size of the first strip grooves in the second target concave structure group; in the second direction, the size of the first strip grooves in the first target concave structure group is less than or equal to the size of the first strip grooves in the second target concave structure group.

[0016] Optionally, the distance between two adjacent first recessed structure groups is 5 μm to 20 μm.

[0017] Optionally, in the first direction, the first concave pattern has a first reference point closest to the bending area, and a second reference point farthest from the bending area, and the distance between the first reference point and the second reference point is 0.1 mm to 10 mm.

[0018] Optionally, in the first direction, the distance between the first strip groove in the first recessed pattern that is closest to the bending area and the hollow structure in the multiple hollow structures in the supporting layer that is closest to the first recessed pattern is 2mm to 20mm; or, the supporting layer further includes multiple recessed structures, and in the first direction, the multiple recessed structures are located on both sides of the multiple hollow structures, and in the first direction, the distance between the first strip groove in the first recessed pattern that is closest to the bending area and the hollow structure in the multiple recessed structures in the supporting layer that is closest to the first recessed pattern is 2mm to 20mm.

[0019] Optionally, a ratio of the depth of the first strip-shaped groove to the thickness of the isolation layer is 1 / 3 to 1.

[0020] Optionally, the isolation layer is made of a metal material or an inorganic non-metallic material.

[0021] Optionally, the support member further includes a plurality of first filling structures, and the plurality of first filling structures are located in the first recessed pattern; the modulus of the first filling structure is smaller than the modulus of the isolation layer.

[0022] Optionally, the support member further includes a first adhesive layer, which is located on the side of the isolation layer away from the support layer; the first adhesive layer located in the first transition zone and the first adhesive layer located in the second transition zone respectively have a second recessed pattern; the orthographic projection of the second recessed pattern on the first surface at least partially overlaps with the orthographic projection of the first recessed pattern on the first surface.

[0023] Optionally, the orthographic projection of the second recessed pattern on the first surface partially overlaps with the orthographic projection of the first recessed pattern on the first surface, the second recessed pattern includes a second strip groove and the length direction of the second strip groove is the second direction, the size of the second strip groove in the second direction is equal to the size of the first adhesive layer in the second direction, and the depth of the second strip groove is the same as the thickness of the first adhesive layer.

[0024] Optionally, the support member further includes a first adhesive layer, which is located on a side of the isolation layer away from the support layer; and the first adhesive layer located in the bending area has a second concave pattern.

[0025] Optionally, the second concave pattern includes a second strip-shaped groove, and a size of the second strip-shaped groove in the first direction is 1 mm to 30 mm.

[0026] Optionally, the support member further includes a second filling structure, which is located in the second recessed pattern; and the modulus of the second filling structure is smaller than the modulus of the isolation layer.

[0027] Optionally, the support member also includes a second adhesive layer, which is located between the isolation layer and the support layer; the second adhesive layer located in the first transition zone and the second adhesive layer located in the second transition zone respectively have a third recessed pattern; the orthographic projection of the third recessed pattern on the first surface at least partially overlaps with the orthographic projection of the first recessed pattern on the first surface.

[0028] Optionally, the orthographic projection of the third recessed pattern on the first surface coincides with the orthographic projection of the first recessed pattern on the first surface, and the third recessed pattern includes a plurality of third recessed structure groups, the plurality of third recessed structure groups are arranged along the first direction, and each third recessed structure group includes a plurality of third recessed structures arranged along the second direction; the plurality of third recessed structure groups include a third target recessed structure group and a fourth target recessed structure group, the third target recessed structure group and the fourth target recessed structure group are adjacent and the third target recessed structure group is located on the side of the fourth target recessed structure group away from the bending zone; the depth of the third recessed structure in the third target recessed structure group is less than the depth of the third recessed structure in the fourth target recessed structure group.

[0029] Optionally, the orthographic projection of the third recessed pattern on the first surface partially overlaps with the orthographic projection of the first recessed pattern on the first surface, and the third recessed pattern includes a third strip groove, the size of the third strip groove in the second direction is equal to the size of the second adhesive layer in the second direction, and the depth of the third strip groove is the same as the thickness of the second adhesive layer.

[0030] Optionally, the support member further includes a second adhesive layer, which is located between the isolation layer and the support layer; and the second adhesive layer located in the bending area has a third concave pattern.

[0031] Optionally, the third concave pattern includes a third strip-shaped groove, and a size of the third strip-shaped groove in the first direction is 1 mm to 30 mm.

[0032] Optionally, the support member also includes a third filling structure, which is located in the third recessed pattern; the modulus of the third filling structure is smaller than the modulus of the isolation layer, or the modulus of the third filling structure is smaller than the modulus of the isolation layer and the thermal conductivity of the third filling structure is greater than or equal to 110w / (m*k).

[0033] Optionally, the support member further includes a first transition zone and a second transition zone, the first transition zone is located between the first plane zone and the bending zone, the second transition zone is located between the bending zone and the second plane zone, the isolation layer is also located in the first transition zone and the second transition zone, the isolation layer is a whole layer structure, the support member further includes a first adhesive layer and a second adhesive layer, the first adhesive layer is located on the side of the isolation layer away from the support layer, the second adhesive layer is located between the isolation layer and the support layer; the first adhesive layer located in the first transition zone and the first adhesive layer located in the second transition zone respectively have a second concave pattern, or the first adhesive layer located in the bending zone has a second concave pattern; and / or the second adhesive layer located in the first transition zone and the second adhesive layer located in the second transition zone respectively have a third concave pattern, or the second adhesive layer located in the bending zone has a third concave pattern.

[0034] On the other hand, a method for manufacturing a support member is provided, characterized in that the method includes: providing a support layer; manufacturing an isolation layer on a first surface of the support layer; wherein the support member includes a first plane area, a bending area and a second plane area sequentially connected in a first direction, the extension direction of the bending area of ​​the support member is a second direction, the second direction intersects with the first direction, the support layer includes a plurality of hollow structures located in the bending area, the isolation layer is located in the first plane area, the bending area and the second plane area, the isolation layer includes a whole layer structure located in the bending area, the modulus of the isolation layer is 10GPa~250GPa, and the thickness of the isolation layer is less than the thickness of the support layer.

[0035] On the other hand, a foldable display device is provided, comprising a stacked display panel and any one of the aforementioned support members, wherein a side of the support member away from the supporting layer is connected to a back surface of the display panel.

[0036] The beneficial effects brought about by the technical solution provided by the present disclosure include at least: by using an isolation layer made of a high modulus material, the mold imprint problem caused by the hollow structure of the support layer in the bending area is improved, and at the same time, the problem of creep of multiple polymer material layers in the foldable display device after multiple bendings leading to creases, thereby reducing the surface flatness of the foldable display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] FIG1 is a schematic cross-sectional view of a support member provided in an embodiment of the present disclosure;

[0039] FIG2 is a schematic diagram of a planar structure of a support member provided in an embodiment of the present disclosure;

[0040] FIG3 shows the pen drop test results of a foldable display device using isolation layers made of different modulus materials according to an embodiment of the present disclosure;

[0041] FIG4 is a schematic diagram of a cross-sectional structure of a support member in a bent state provided by an embodiment of the present disclosure;

[0042] FIG5 is a schematic diagram of a planar structure of another supporting member provided in an embodiment of the present disclosure;

[0043] FIG6 is a schematic diagram of a planar structure of another support member provided in an embodiment of the present disclosure;

[0044] FIG7 is a schematic diagram of a planar structure of another supporting member provided in an embodiment of the present disclosure;

[0045] FIG8 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0046] FIG9 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0047] FIG10 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0048] FIG11 is a schematic plan view of the support member in FIG10;

[0049] FIG12 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0050] FIG13 is a schematic plan view of the support member in FIG12;

[0051] FIG14 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0052] FIG15 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0053] FIG16 is a schematic plan view of the support member in FIG15;

[0054] FIG17 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0055] FIG18 is a schematic plan view of the support member in FIG17;

[0056] FIG19 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure;

[0057] FIG20 is a schematic plan view of the support member in FIG19;

[0058] FIG21 is a schematic diagram of a cross-sectional structure of a support member provided in an embodiment of the present disclosure;

[0059] FIG22 is a schematic diagram showing the degree to which different designs of a support member provided by an embodiment of the present disclosure affect the bending stress of a display panel or an adhesive layer in a foldable display device;

[0060] FIG23 is a schematic flow chart of a method for manufacturing a support member according to an embodiment of the present disclosure;

[0061] FIG24 is a schematic diagram of the cross-sectional structure of a foldable display device provided in an embodiment of the present disclosure.

[0062] Legend: A, bending area A1, bending center area A21, third transition area A22, fourth transition area B1, first transition area B2, second transition area C1, first plane area C2, second plane area D, first surface E, connecting point x, first direction y, second direction m, first strip groove n, second strip groove o, third strip groove 1, support member 11, support layer 111, hollow structure 112, recessed structure 12, isolation layer 121, first recessed pattern 1210, first recessed pattern 1211 Recessed structure group 1210a, first target recessed structure group 1210b, second target recessed structure group 122, first filling structure 13, first adhesive layer 131, second recessed pattern 132, second filling structure 14, second adhesive layer 141, third recessed pattern 1410, third recessed structure group 1410a, third target recessed structure 1410b, fourth target recessed structure 142, third filling structure 2, back film 3, display panel 4, polarizer 5, cover plate DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0064] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the ordinary meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second", "third" and similar words used in the patent application specification and claims of this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "a" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The directional terms mentioned in the present disclosure, such as "top", "bottom", "up", "down", "left" or "right", etc., are only used to refer to the directions of the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present disclosure, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0065] A foldable display device generally includes a support member and a display panel, and the support member is connected to the back of the display panel. The support member includes a support layer, and the support member includes a bending zone. In order to enable the foldable display device to be folded, a hollow structure is provided on the portion of the support layer located in the bending zone. However, the opening will cause a mold imprint on the display panel, affecting the user experience. In order to improve this problem, an isolation layer is provided between the support layer and the display panel in the related art. The isolation layer is located in the bending zone and the isolation layer is made of a polymer material. However, although the isolation layer can improve the mold imprint problem caused by the support layer in the bending zone, since the isolation layer and the multiple adhesive layers in the foldable display device are all made of polymer materials, these polymer material layers will creep after multiple bendings, and creases will be generated in the bending zone, resulting in these polymer material layers still being unable to be flattened when the foldable display device is unfolded, resulting in a decrease in the surface flatness of the foldable display device. Among them, the multiple adhesive layers in the foldable display device include an adhesive layer in the support member (such as foam, polyimide PI and polyethylene terephthalate PET), an adhesive layer between the cover plate and the polarizer, an adhesive layer between the polarizer and the display panel, and an adhesive layer between the display panel and the back film.

[0066] To this end, embodiments of the present disclosure provide a support member. By providing an isolation layer made of a high-modulus material within the support member, this layer not only mitigates the impression caused by the hollow structure of the support layer in the bending zone, but also helps other polymer material layers that have creased due to creep to restore surface flatness after repeated bending, thereby reducing creases. Furthermore, the high-modulus isolation layer's high strength improves the support member's impact resistance in the bending zone.

[0067] Figure 1 is a schematic diagram of the cross-sectional structure of a support member provided by an embodiment of the present disclosure. The support member is in a flattened state. As shown in Figure 1, the support member 1 includes a support layer 11 and an isolation layer 12 stacked on the first surface D of the support layer 11. The support layer 11 has a first plane area C1, a bending area A, and a second plane area C2 sequentially connected in a first direction x. The isolation layer 12 is located in the first plane area C1, the bending area A, and the second plane area C2, and the isolation layer 12 covers the bending area A (that is, the portion of the isolation layer 12 located in the bending area A is a whole layer structure), and the thickness of the isolation layer 12 is less than the thickness of the support layer 11. The modulus of the isolation layer 12 is 10GPa to 250GPa.

[0068] Figure 2 is a schematic diagram of a planar structure of a support member provided by an embodiment of the present disclosure. Referring to Figures 1 and 2 , the length direction of the bending region A is the second direction y, which intersects the first direction x. The support layer 11 includes a plurality of hollow structures 111 located in the bending region A.

[0069] Exemplarily, the isolation layer 12 is made of a metal material (such as stainless steel, titanium alloy, aluminum alloy) or an inorganic non-metallic material (such as ceramic, glass).

[0070] FIG3 is a result of a pen drop test on a foldable display device using an isolation layer of different modulus materials provided by an embodiment of the present disclosure. As shown in FIG3 , the pen drop height of the foldable display device increases as the modulus of the isolation layer material increases, that is, the impact resistance of the foldable display device is significantly increased. Among them, the pen drop height of the foldable display device using an isolation layer made of a material with a modulus of 190 GPa (such as stainless steel SUS) is about 5 times the pen drop height of the foldable display device using an isolation layer made of a material with a modulus of 5 MPa (such as foam material); the pen drop height of the foldable display device using an isolation layer made of a material with a modulus of 190 GPa (such as stainless steel SUS) is about 3.5 times the pen drop height of the foldable display device using an isolation layer made of a material with a modulus of 4 GPa (such as PI material). It should be noted that the test results in FIG3 are normalized, and the ordinate only reflects the proportional relationship of the pen drop heights of the foldable display devices with different modulus isolation layers, and does not represent the specific value of the pen drop height.

[0071] For example, as shown in FIG1 , the support member 1 further includes a first adhesive layer 13 . The first adhesive layer 13 is located on the side of the isolation layer 12 away from the support layer 11 . The first adhesive layer 13 is used to secure the support layer to other structures in the foldable display device (e.g., a backing film). Optionally, the first adhesive layer 13 is a pressure-sensitive adhesive. In other possible embodiments, the first adhesive layer 13 is an optically clear adhesive (OCA) or silicone adhesive.

[0072] For example, as shown in FIG1 , the support member 1 further includes a second adhesive layer 14 , which is located between the isolation layer 12 and the support layer 11 and is used to bond the support layer 11 and the isolation layer 12 together. Optionally, the second adhesive layer 14 is a pressure-sensitive adhesive. In other possible embodiments, the second adhesive layer 14 is an OCA adhesive, silicone, or the like.

[0073] Although the isolation layer 12 made of high modulus material can reduce the imprint of the support layer 11 in the bending area A and improve the impact resistance of the foldable display device, when the support member 1 is bent, the isolation layer 12 made of high modulus material will increase the bending force of multiple structural layers in the foldable display device, thereby causing poor stratification, such as stratification at the light-emitting layer of the display panel. Here, the force on the multiple structural layers in the foldable display device includes the force on the display panel and multiple adhesive layers. Among them, the multiple adhesive layers include the first adhesive layer 13 and the second adhesive layer 14 in the support member 1, and also include adhesive layers outside the support member, such as the adhesive layer between the cover plate and the polarizer, the adhesive layer between the polarizer and the display panel, and the adhesive layer between the display panel and the back film.

[0074] Figure 4 is a schematic cross-sectional view of a support member in a bent state, provided by an embodiment of the present disclosure. In conjunction with Figures 1 and 4, support member 1 further includes a first transition region B1 and a second transition region B2. First transition region B1 is located between first planar region C1 and bending region A, and second transition region B2 is located between bending region A and second planar region C2. An isolation layer 12 is also located between first and second transition regions B1 and B2.

[0075] In the embodiment of the present disclosure, a recessed pattern is formed in the support member, and the recessed pattern is located in at least one of the isolation layer 12, the first adhesive layer 13 and the second adhesive layer 14, thereby reducing the bending force of multiple structural layers in the foldable display device.

[0076] The following describes how to make a concave pattern in the support member. First, an embodiment in which only the first concave pattern is made in the isolation layer 12 is described.

[0077] As shown in Figures 1 and 2, the isolation layer 12 located in the first transition region B1 and the isolation layer 12 located in the second transition region B2 each have a first recessed pattern 121. By forming the first recessed pattern in the portions of the isolation layer 12 located in the first transition region B1 and the second transition region B2, the bending forces acting on the display panel and multiple adhesive layers in the foldable display device can be reduced.

[0078] For example, the first recessed pattern 121 comprises only one first stripe-shaped groove m. The dimension of the first stripe-shaped groove m in the second direction y is the same as the dimension of the isolation layer 12 in the second direction y, and the depth of the first stripe-shaped groove m is equal to the thickness of the isolation layer 12. In other words, the isolation layer 12 is separated between the first transition region B1 and the second transition region B2, forming three unconnected sections. By forming the first recessed pattern 121 as the first stripe-shaped groove m, the bending forces acting on the display panel and multiple adhesive layers in a foldable display device can be reduced.

[0079] Exemplarily, the support layer further includes a plurality of recessed structures 112, which are located on both sides of the plurality of hollow structures 111 in the first direction x. In the first direction x, the distance between a first strip groove m in the first recessed pattern 121 that is closest to the bending region A and a recessed structure 112 in the support layer 11 that is closest to the first recessed pattern 121 is 2 mm to 20 mm. Specifically, as shown in Figures 1 and 2, in the first direction x, the distance a between a first strip groove m in the first transition region B1 and a hollow structure 111 in the plurality of hollow structures 111 in the support layer 11 that is closest to the first transition region B1 is 2 mm to 20 mm; and in the first direction x, the distance a' between a first strip groove m in the second transition region B2 and a hollow structure 111 in the plurality of hollow structures 111 in the support layer 11 that is closest to the second transition region B2 is 2 mm to 20 mm. If the distance between the first recessed pattern 121 and the hollow structure 111 is too small, the first recessed pattern 121 may enter the bending zone A due to material and process tolerances, resulting in the isolation layer 12 being unable to block the imprint of the support layer 11 in the bending zone A. If the distance between the first recessed pattern 121 and the hollow structure 111 is too large, it will not be able to reduce the bending force on the display panel and multiple adhesive layers in the foldable display device. In this embodiment, the distance a and the distance a' are equal. In other possible embodiments, the distance a and the distance a' are not equal. In other possible embodiments, the support layer does not have a recessed structure 112, but only has multiple hollow structures 111. In this case, in the first direction x, the distance between the first strip groove m in the first recessed pattern 121 closest to the bending zone A and the hollow structure 111 in the multiple hollow structures 111 in the support layer 11 closest to the first recessed pattern 121 is 2 mm to 20 mm.

[0080] In the embodiment shown in Figures 1 and 2 , the first recessed pattern 121 includes a first stripe-shaped groove m that extends through the isolation layer 12 , meaning the ratio of the depth of the first stripe-shaped groove m to the thickness of the isolation layer 12 is 1. In the embodiment shown in Figures 1 and 2 , because the isolation layer 12 includes three unconnected portions, during fabrication, the relative distances between the three portions, and therefore the dimensions of the first stripe-shaped groove m in the first direction x, are maintained solely by the first adhesive layer 13 located above the isolation layer 12 and the second adhesive layer 14 located below the isolation layer 12 . However, since the first adhesive layer 13 and the second adhesive layer 14 are relatively soft, the dimensions of the first stripe-shaped groove m in the first direction x may vary.

[0081] In other possible embodiments, compared with the embodiment shown in Figure 2, the first recessed pattern 121 includes a first strip groove m and the depth of the first strip groove m is less than the thickness of the isolation layer 12, that is, the first strip groove m does not penetrate the isolation layer 12, and the isolation layer 12 is not divided into multiple unconnected parts, thereby avoiding the size of the first recessed pattern 12 in the first direction x from changing.

[0082] For example, the ratio of the depth of the first strip groove m to the thickness of the isolation layer 12 is at least 1 / 3. That is, the ratio of the depth of the first strip groove m to the thickness of the isolation layer 12 is 1 / 3 to 1. If the depth of the first strip groove m is too small, it will not be able to reduce the bending force of the display panel and multiple adhesive layers in the foldable display device.

[0083] Exemplarily, as shown in FIG1 , the support member 1 further includes a plurality of first filling structures 122, each of which is located in a first strip-shaped groove m. The modulus of the first filling structure 122 is less than the modulus of the isolation layer 12. The first recessed pattern 121 will form a small amount of imprint in the first transition zone B1 and the second transition zone B2. Providing a first filling structure 122 made of a low modulus material can improve the imprint produced by the first recessed pattern 121 and take into account the bendability of the support member. It should be noted that the first recessed pattern 121 here will cause a small amount of imprint in the first transition zone B1 and the second transition zone B2, which means that compared with the imprint produced by the hollow structure 111 in the support layer 11 in the bending zone A when the isolation layer 12 is not provided, the imprint produced by the first recessed pattern 121 is less.

[0084] Optionally, the modulus of the first filling structure 122 is 1 MPa to 10 GPa. For example, the first filling structure 122 is made of thermoplastic polyurethane or rubber.

[0085] For example, as shown in Figure 2, in the first direction x, the first recessed pattern 121 has a first reference point closest to the bending region A and a second reference point farthest from the bending region A. The distance d1 between the first reference point and the second reference point is 5 μm to 100 μm. In the embodiment shown in Figure 2, the distance d1 is the width of the first strip groove m. The smaller the distance d1, the better. If the distance d1 is too large, the isolation layer 12 will leave a noticeable imprint in the first transition region B1 and the second transition region B2.

[0086] Figure 5 is a schematic diagram of the planar structure of another support member provided by an embodiment of the present disclosure. As shown in Figure 5, the first recessed pattern 121 includes a first strip groove m and the length direction of the first strip groove m is the second direction y, the size of the first strip groove m in the second direction y is smaller than the size of the isolation layer 12 in the second direction y, and the depth of the first strip groove m is the same as the thickness of the isolation layer 12. Compared with the embodiment shown in Figure 2, the embodiment shown in Figure 5 also provides a first strip groove m that passes through the isolation layer 12, but there are connecting points E at both ends of the first strip groove m. On the basis of the embodiment shown in Figure 2, the embodiment shown in Figure 5 provides a connecting point E, so that the isolation layers of the three unconnected parts in Figure 2 can be connected. The connecting point E can prevent the size of the first strip groove m from changing in the first direction x, that is, prevent the size of the first recessed pattern 12 from changing in the first direction x.

[0087] For example, as shown in Figure 5, the dimension b of the connecting point in the second direction y is 0.01 mm to 5 mm. If dimension b is too small, it will not be able to maintain the dimension of the first strip groove m in the first direction x; if dimension b is too large, it will not be able to effectively reduce the bending force of the display panel and multiple adhesive layers in the foldable display device.

[0088] In other possible embodiments, the first recessed pattern 121 includes a first strip groove m and the length direction of the first strip groove m is the second direction y, the size of the first strip groove m in the second direction y is smaller than the size of the isolation layer 12 in the second direction y, and the depth of the first strip groove m is smaller than the thickness of the isolation layer 12.

[0089] Optionally, the orthographic projection of the first strip groove m on the first surface D is a rectangle as shown in FIG2 , or a rectangle with arc protrusions at both ends as shown in FIG5 . In other possible embodiments, the orthographic projection of the first strip groove on the first surface D may also be other shapes extending in the second direction y, which is not limited in the embodiments of the present disclosure.

[0090] Figure 6 is a schematic plan view of another support member according to an embodiment of the present disclosure. Compared to the embodiment shown in Figure 2, the first recessed pattern 121 in Figure 6 includes a plurality of first strip-shaped grooves m arranged along the second direction y, with the length of the first strip-shaped grooves m extending along the second direction y. Providing a row of first strip-shaped grooves m within the first recessed pattern 121 can also reduce the bending forces exerted on the display panel and the multiple adhesive layers in a foldable display device.

[0091] Figure 7 is a schematic planar structural diagram of another support member provided by an embodiment of the present disclosure. Compared to the embodiment shown in Figure 6, in the embodiment shown in Figure 7, the first recessed pattern 121 includes multiple first recessed structure groups 1210. These multiple first recessed structure groups 1210 are arranged along a first direction x. Each first recessed structure group 1210 includes multiple first recessed structures arranged along a second direction y, with the length of the first recessed structures being along the second direction y. Exemplarily, the first recessed structures are first stripe-shaped grooves m. That is, with the second direction y being the column direction, in the embodiment shown in Figure 6, the isolation layer 12 located in the first transition region B1 includes a single column of first stripe-shaped grooves m. In the embodiment shown in Figure 7, the isolation layer 12 located in the first transition region B1 includes multiple columns of first stripe-shaped grooves m. The first recessed pattern 121 in the second transition region B2 is arranged in the same manner as in the first transition region B1 and will not be further described here. Providing multiple columns of first recessed structures in both the first transition region B1 and the second transition region B2 can also reduce the bending forces acting on the display panel and multiple adhesive layers in a foldable display device. In other possible embodiments, each first recessed structure group 1210 may include multiple first strip grooves m arranged along the second direction y, but may include multiple through holes arranged along the second direction y. Optionally, the orthographic projection of the through holes on the first surface D is circular or square.

[0092] For example, as shown in FIG7 , the plurality of first recessed structure groups 1210 include a first target recessed structure group 1210a and a second target recessed structure group 1210b. The first target recessed structure group 1210a and the second target recessed structure group 1210b are adjacent to each other, with the first target recessed structure group 1210a being located on the side of the second target recessed structure group 1210b away from the bending region A. The orthographic projections of two adjacent first strip grooves m in the second target recessed structure group 1210b on a reference plane partially overlap with the orthographic projections of the first strip grooves m in the first target recessed structure group 1210a on the reference plane, which is perpendicular to the first surface D and parallel to the second direction y. Staggering the plurality of first strip grooves m in the first recessed pattern 121 can minimize the imprint caused by the first recessed pattern 121. In other possible embodiments, the plurality of first strip grooves m in the first recessed pattern 121 are arranged in an array, rather than in a staggered arrangement as shown in FIG7 . It should be noted that the first target recessed structure group 1210a and the second target recessed structure group 1210b marked in FIG7 are merely examples, and any two adjacent first recessed structure groups 1210 among the multiple first recessed structure groups 1210 included in the first recessed pattern 121 may be the first target recessed structure group 1210a and the second target recessed structure group 1210b, respectively.

[0093] For example, as shown in Figure 7, in the first direction x, the first recessed pattern 121 has a first reference point closest to the bending region A and a second reference point farthest from the bending region A. The distance d2 between the first reference point and the second reference point is 0.1 mm to 10 mm. In the embodiment shown in Figure 7, the distance d2 is the distance between the two outermost edges of the multiple columns of first strip grooves m in the first direction x. The smaller the distance d2, the better. If the distance d2 is too large, the stenciling of the isolation layer 12 in the first transition region B1 and the second transition region B2 will be more obvious.

[0094] FIG8 is a schematic diagram of the cross-sectional structure of another support member provided in an embodiment of the present disclosure, and FIG8 is a cross-sectional view along the FF section line in FIG7 . For example, as shown in FIG7 and FIG8 , the number of first strip grooves m in the first target recessed structure group 1210a is less than the number of first strip grooves m in the second target recessed structure group 1210b. The depth of the first strip grooves m in the first target recessed structure group 1210a is less than the depth of the first strip grooves m in the second target recessed structure group 1210b. In the first direction x, the size of the first strip grooves m in the first target recessed structure group 1210a is less than or equal to the size of the first strip grooves m in the second target recessed structure group 1210b. In the second direction y, the size of the first strip grooves m in the first target recessed structure group 1210a is less than or equal to the size of the first strip grooves m in the second target recessed structure group 1210b. In the direction from the bending region A toward the first planar region C1, or in the direction from the bending region A toward the second planar region C2, the number of first strip grooves m in the first recessed pattern 121 is gradually reduced, the dimensions of the first strip grooves m in the first direction x and the second direction y are gradually reduced, and the depth of the first strip grooves m is gradually reduced. This gradual design can minimize the imprint of the isolation layer 12 in the first transition region B1 and the second transition region B2. In other possible embodiments, only one or two of the following three parameters may be gradually varied: the number of first strip grooves m, the dimensions of the first strip grooves m in the first direction x and the second direction y, or the depth of the first strip grooves m, while the others remain unchanged, i.e., no gradual design is performed.

[0095] For example, as shown in FIG7 , the distance c between two adjacent first recessed structure groups 1210 is 5 μm to 20 μm. The dimension c should be as small as possible. The smaller the dimension c, the less noticeable the mold imprint caused by the isolation layer 12. If the dimension c is too large, it will not reduce the bending stress of other structural layers.

[0096] Exemplarily, as shown in Figure 7, in the first direction x, when the first recessed pattern 121 includes multiple columns of first strip grooves m, the distance a between a first strip groove m in the first recessed pattern 121 that is closest to the bending area A and a recessed structure 112 in the multiple recessed structures 112 in the supporting layer that is closest to the first recessed pattern 121 is 2 mm to 20 mm.

[0097] In the embodiments shown in FIG. 5 to FIG. 8 , a first filling structure 122 may be provided in the first recessed pattern 121 to make the mold imprint produced by the first recessed pattern 121 less obvious.

[0098] In addition to forming the first recessed pattern 121 in the isolation layer 12, a second recessed pattern 131 may also be formed in the first adhesive layer 13. The second recessed pattern 131 will be described below.

[0099] Figure 9 is a schematic cross-sectional view of another support member provided by an embodiment of the present disclosure. As shown in Figure 9, the first adhesive layer 13 located in the first transition region B1 and the first adhesive layer 13 located in the second transition region B2 each have a second recessed pattern 131. The orthographic projection of the second recessed pattern 131 on the first surface D at least partially overlaps with the orthographic projection of the first recessed pattern 121 on the first surface D. By forming the second recessed pattern 131 in the first adhesive layer 13, in addition to forming the first recessed pattern 121 in the isolation layer 12, the bending forces acting on the display panel and multiple adhesive layers in the foldable display device can be further reduced.

[0100] For example, as shown in FIG9 , the orthographic projection of the second recessed pattern 131 on the first surface D coincides with the orthographic projection of the first recessed pattern 121 on the first surface D, and the second recessed pattern 131 includes at least one second strip groove n. When manufacturing the support member, the entire isolation layer 12 and first adhesive layer 13 can be fabricated first, and then the isolation layer 12 and a portion of the first adhesive layer 13 located in the first transition region B1 can be removed simultaneously. Furthermore, the isolation layer 12 and a portion of the first adhesive layer 13 located in the second transition region B2 can be removed simultaneously in a direction perpendicular to the first direction x and the second direction y, thereby saving process steps. In a direction perpendicular to the first direction x and the second direction y, each second strip groove n extends through the first adhesive layer 13. In the first direction x and the second direction y, the dimensions of the second strip grooves n in the second recessed pattern 131 are identical to those of the first strip grooves m in the first recessed pattern 121, and are not further described herein.

[0101] Figure 10 is a schematic diagram of the cross-sectional structure of another support member provided in an embodiment of the present disclosure, Figure 11 is a schematic diagram of the planar structure of the support member in Figure 10, and Figure 10 is a cross-sectional view along the GG section line in Figure 11. As shown in Figures 10 and 11, the orthographic projection of the second recessed pattern 131 on the first surface D partially overlaps with the orthographic projection of the first recessed pattern 121 on the first surface D, the size of the second strip groove n in the second direction y is equal to the size of the first adhesive layer 13 in the second direction y, and the depth of the second strip groove n is the same as the thickness of the first adhesive layer 13. It should be noted that Figure 11 only shows the planar structure of the isolation layer 12 and the first adhesive layer 13, and in order to clearly illustrate the projection relationship between the two, the first adhesive layer 13 is pattern-filled in Figure 11. In the embodiments shown in Figures 10 and 11, the first adhesive layer 13 includes three separate parts, and the first adhesive layer 13 can be manufactured by segmented gluing, and the manufacturing process is simple. In the embodiment shown in FIG. 10 and FIG. 11 , the orthographic projection of a portion of the first recessed pattern 121 on the first surface D is located outside the orthographic projection of the second recessed pattern 131 on the first surface D.

[0102] It should be noted that the embodiment shown in FIG. 10 is a newly manufactured product. As shown in FIG. 10 , during actual use, the second adhesive layer 13 may enter the first strip-shaped groove m.

[0103] Exemplarily, a dimension of the second strip-shaped groove n in the first direction x is 50 μm to 200 μm.

[0104] 10 , the orthographic projection of the second strip groove n on the first surface D is located within the orthographic projection of the first strip groove m on the first surface D. In other possible embodiments, the orthographic projection of the first strip groove m on the first surface D is located within the orthographic projection of the second strip groove n on the first surface D, or the orthographic projection of the first strip groove m on the first surface D partially overlaps with the orthographic projection of the second strip groove n on the first surface D.

[0105] Figure 12 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure, and Figure 13 is a schematic plan view of the support member in Figure 12 , with Figure 12 being a cross-sectional view taken along line HH in Figure 13 . As shown in Figures 12 and 13 , the first adhesive layer 13 located in the bending region A has a second recessed pattern 131. When forming the second recessed pattern 131 within the first adhesive layer 13 , it is also possible to form the second recessed pattern 131 in the bending region A instead of in the first transition region B1 and the second transition region B2. This can also achieve the goal of reducing the bending force on the display panel and multiple adhesive layers in the foldable display device.

[0106] For example, as shown in Figure 13, the second recessed pattern 131 includes a second strip-shaped groove n, and the dimension e of the second strip-shaped groove n in the first direction x is 1 mm to 30 mm. If the dimension e is too small, it will not be able to reduce the bending force of the display panel and multiple adhesive layers in the foldable display device. If the dimension e is too large, it may cause the display panel located above the support member to collapse in the bending area A, the first transition area B1, and the second transition area B2.

[0107] In the embodiments shown in Figures 10 to 13 above, when the second recessed pattern 131 is not produced synchronously with the first recessed pattern 121, the second recessed pattern 131 only includes one second strip groove n. This is because if multiple second strip grooves n are produced in the first adhesive layer 13 alone, the process is more complicated, and the first adhesive layer 13 is relatively soft and has a certain fluidity, and cannot maintain the shape of the multiple second strip grooves n. Therefore, a method such as die cutting is adopted to prepare a second strip groove n that passes through the first adhesive layer 13 to form a second recessed pattern 131, and the process is simple.

[0108] Exemplarily, the support member 1 further includes a second filling structure 132, which is located within the second strip groove n in any of the embodiments shown in Figures 9 to 13 above, and has a modulus that is less than the modulus of the isolation layer 12. Providing the second filling structure 132 made of a low-modulus material can further improve the mold printing problem caused by the removal of part of the first adhesive layer 13 located in the first transition zone B1 and the second transition zone B2, or the removal of part of the first adhesive layer 13 located in the bending zone A, while also taking into account the bendability of the support member.

[0109] Optionally, the modulus of the second filling structure 132 is 1 MPa to 10 GPa. For example, the second filling structure 132 is made of thermoplastic polyurethane, rubber, silicone, etc.

[0110] In addition to forming the first recessed pattern 121 in the isolation layer 12, a third recessed pattern 141 may be formed in the second adhesive layer 14. The third recessed pattern 141 will be described below.

[0111] Figure 14 is a schematic cross-sectional view of another support member provided by an embodiment of the present disclosure. As shown in Figure 14, the second adhesive layer 14 located in the first transition region B1 and the second adhesive layer 14 located in the second transition region B2 each have a third recessed pattern 141. The orthographic projection of the third recessed pattern 141 on the first surface D at least partially overlaps with the orthographic projection of the first recessed pattern 121 on the first surface D. By forming the third recessed pattern 141 in the second adhesive layer 14, in addition to forming the first recessed pattern 121 in the isolation layer 12, the bending forces acting on the display panel and the multiple adhesive layers in the foldable display device can be further reduced.

[0112] For example, as shown in Figure 14, the orthographic projection of the third recessed pattern 141 on the first surface D coincides with the orthographic projection of the first recessed pattern 121 on the first surface D. The third recessed pattern 141 includes at least one third strip groove o. When manufacturing the support member, the entire second adhesive layer 14 and isolation layer 12 can be first fabricated, and then portions of the isolation layer 12 and second adhesive layer 14 located in the first transition region B1 can be simultaneously removed. Furthermore, portions of the isolation layer 12 and second adhesive layer 14 located in the second transition region B2 can be simultaneously removed in a direction perpendicular to the first direction x and the second direction y, thereby simplifying the manufacturing process. In the first direction x and the second direction y, the dimensions of the third strip groove o in the third recessed pattern 141 are identical to those of the first strip groove m in the first recessed pattern 121, and are not further described here.

[0113] Figure 15 is a schematic diagram of the cross-sectional structure of another support member provided in an embodiment of the present disclosure. As shown in Figure 15, when the first recessed pattern 121 includes multiple columns of first strip grooves m, and the first recessed pattern 121 and the third recessed pattern 141 are produced simultaneously, the third recessed pattern 141 also includes multiple columns of third strip grooves o. Figure 16 is a schematic diagram of the planar structure of the support member in Figure 15, and Figure 15 is a cross-sectional view along the II section line in Figure 16. As shown in Figure 16, the third recessed pattern 141 includes multiple third recessed structure groups 1410, and the multiple third recessed structure groups 1410 are arranged along the first direction x, and each third recessed structure group 1410 includes multiple third recessed structures arranged along the second direction y. The plurality of third recessed structure groups 1410 include a third target recessed structure group 1410a and a fourth target recessed structure group 1410b. The third target recessed structure group 1410a and the fourth target recessed structure group 1410b are adjacent, with the third target recessed structure group 1410a located on the side of the fourth target recessed structure group 1410b away from the bending zone. The depth of the third recessed structures in the third target recessed structure group 1410a is less than the depth of the third recessed structures in the fourth target recessed structure group 1410b. Exemplarily, the third recessed structures are third strip-shaped grooves o. This design, in which the depth of the third strip-shaped grooves o gradually decreases from the bending zone A toward the first planar region C1 or from the bending zone A toward the second planar region C2, minimizes the imprint of the isolation layer 12 in the first transition region B1 and the second transition region B2. In other possible embodiments, the third recessed structures and the first recessed structures may both be through holes of the same shape.

[0114] Figure 17 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure, and Figure 18 is a schematic plan view of the support member in Figure 17 , with Figure 17 being a cross-sectional view taken along section line JJ in Figure 18 . As shown in Figures 17 and 18 , the orthographic projection of the third recessed pattern 141 on the first surface D at least partially overlaps with the orthographic projection of the first recessed pattern 121 on the first surface D. The third recessed pattern 141 includes a third stripe-shaped groove o, the dimension of the third stripe-shaped groove o in the second direction y being equal to the dimension of the second adhesive layer 14 in the second direction y, and the depth of the third stripe-shaped groove o being equal to the thickness of the second adhesive layer 14. It should be noted that Figure 18 only illustrates the planar structure of the isolation layer 12 and the second adhesive layer 14, and to clearly illustrate the projected relationship between the two, the second adhesive layer 14 is pattern-filled in Figure 19 . In the embodiments shown in Figures 17 and 18 , the second adhesive layer 14 comprises three separate sections, and the second adhesive layer 13 can be fabricated by segmented adhesive bonding, resulting in a simple fabrication process. 17 and 18 , the orthographic projection of a portion of the first recessed pattern 121 on the first surface D is outside the orthographic projection of the third recessed pattern 141 on the first surface D. In other possible embodiments, the orthographic projection of the first recessed pattern 121 on the first surface D is inside the orthographic projection of the third recessed pattern 141 on the first surface D.

[0115] It should be noted that the embodiment shown in FIG. 17 is a newly manufactured product. As shown in FIG. 10 , during actual use, the second adhesive layer 13 may enter the first strip-shaped groove m.

[0116] Illustratively, the dimension of the third strip groove o in the first direction x is 50 μm to 200 μm. The orthographic projection of the first strip groove m on the first surface D is located within the orthographic projection of the third strip groove o on the first surface D, or the orthographic projection of the first strip groove m on the first surface D partially overlaps with the orthographic projection of the third strip groove o on the first surface D, or, as shown in FIG17 , the orthographic projection of the third strip groove o on the first surface D is located within the orthographic projection of the first strip groove m on the first surface D.

[0117] Figure 19 is a schematic cross-sectional view of another support member provided in an embodiment of the present disclosure. Figure 20 is a schematic plan view of the support member in Figure 19 , and Figure 19 is a cross-sectional view taken along section line KK in Figure 20 . As shown in Figures 19 and 20 , the second adhesive layer 14 located in the bending region A has a third recessed pattern 141. When forming the third recessed pattern 141 within the second adhesive layer 14 , it is also possible to form the third recessed pattern 141 in the bending region A instead of in the first transition region B1 and the second transition region B2. This can also achieve the purpose of reducing the bending force on the display panel and multiple adhesive layers in the foldable display device.

[0118] For example, as shown in Figure 20, the third recessed pattern 141 includes a third stripe-shaped groove o, and the dimension f of the third stripe-shaped groove o in the first direction x is 1 mm to 30 mm. If the dimension f is too small, it will not be able to reduce the bending force of the display panel and multiple adhesive layers in the foldable display device. If the dimension f is too large, it may cause the display panel located above the support member to collapse in the bending area A, the first transition area B1, and the second transition area B2.

[0119] In the embodiments shown in Figures 17 to 20 above, when the third recessed pattern 141 and the first recessed pattern 121 are not produced synchronously, the third recessed pattern 141 only includes one third strip groove o. This is because if multiple third strip grooves o are produced in the second adhesive layer 14 alone, the process is more complicated, and the second adhesive layer 14 is relatively soft and has a certain fluidity, and cannot maintain the shape of the multiple third strip grooves o. Therefore, a method such as die-cutting is adopted to prepare a third strip groove o that passes through the second adhesive layer 14 to form a third recessed pattern 141, and the process is simple.

[0120] Exemplarily, the support member 1 further includes a third filling structure 142, which is located in the third recessed pattern 141 in any of the embodiments shown in Figures 14 to 20 above. The modulus of the third filling structure 142 is lower than the modulus of the isolation layer 14. Providing the third filling structure 142 made of a low-modulus material can support the isolation layer more flatly, improve the mold printing problem caused by the isolation layer 12, and take into account the bendability of the support member.

[0121] Optionally, the modulus of the third filling structure 142 is 1 MPa to 10 GPa. For example, the second filling structure 132 is made of thermoplastic polyurethane, rubber, silicone, etc.

[0122] In other possible embodiments, the modulus of the third filling structure 142 is less than the modulus of the second adhesive layer 14, and the thermal conductivity of the third filling structure 142 is greater than or equal to 110 W / (m*K). For example, the third filling structure 142 may be graphite. Since the circuit board is typically disposed below the support member in a foldable display device, that is, the circuit board is disposed on a side close to the support layer 11 and the second adhesive layer 14, the provision of the third filling structure 142 with a higher thermal conductivity facilitates heat dissipation.

[0123] The above embodiments respectively describe three cases of forming the first recessed pattern 121, forming the first recessed pattern 121 and the second recessed pattern 131, and forming the first recessed pattern 121 and the third recessed pattern 141. In addition to the above embodiments, the first recessed pattern 121 may be formed in the isolation layer 12, the second recessed pattern 131 may be formed in the first adhesive layer 13, and the third recessed pattern 121 may be formed in the second adhesive layer 14 at the same time, including the following cases:

[0124] In the first method, the orthographic projection of the first recessed pattern 121 on the first surface D, the orthographic projection of the second recessed pattern 131 on the first surface D, and the orthographic projection of the third recessed pattern 141 on the first surface D coincide with each other. That is, the first recessed pattern 121, the second recessed pattern 131, and the third recessed pattern 141 can be simultaneously formed in a direction perpendicular to the first direction x and the second direction y. The first stripe grooves penetrate the isolation layer 11, the second stripe grooves n penetrate the first adhesive layer 13, and the third stripe grooves o penetrate or do not penetrate the second adhesive layer 14.

[0125] In the second method, the orthographic projection of the first recessed pattern 121 on the first surface D and the orthographic projection of the third recessed pattern 141 on the first surface D overlap, and the orthographic projection of the first recessed pattern 121 on the first surface D and the orthographic projection of the second recessed pattern 131 on the first surface D partially overlap or do not overlap. That is, the first recessed pattern 121 and the third recessed pattern 141 can be simultaneously formed in a direction perpendicular to the first direction x and the second direction y, and the second recessed pattern 131 shown in FIG. 11 is formed on the first adhesive layer 13 by, for example, segmented adhesive application. The first stripe groove m penetrates the isolation layer 11, the second stripe groove n penetrates the first adhesive layer 13, and the third stripe groove o penetrates or does not penetrate the second adhesive layer 14.

[0126] In the third method, the orthographic projection of the first recessed pattern 121 on the first surface D coincides with the orthographic projection of the second recessed pattern 131 on the first surface D, and the orthographic projection of the first recessed pattern 121 on the first surface D partially overlaps or does not overlap with the orthographic projection of the third recessed pattern 141 on the first surface D. Specifically, the first recessed pattern 121 and the second recessed pattern 131 can be simultaneously formed in a direction perpendicular to the first direction x and the second direction y, and the third recessed pattern 141 shown in FIG18 can be formed on the second adhesive layer 14 by, for example, segmented adhesive application. The first stripe groove m may or may not penetrate the isolation layer 11, the second stripe groove n penetrates the first adhesive layer 13, and the third stripe groove o penetrates the second adhesive layer 14.

[0127] The depth of the second strip groove n in the second recessed pattern 131, and the dimension setting method in the first direction x and the second direction, can be found in the contents in Figures 9 to 13 above. The depth of the third strip groove o in the third recessed pattern 141, and the dimension setting method in the first direction x and the second direction, can be found in the contents in Figures 14 to 20 above, which will not be repeated here.

[0128] FIG21 is a schematic diagram of the cross-sectional structure of a support member provided by an embodiment of the present disclosure. FIG21 exemplarily shows a case in which the support member includes a first recessed pattern 121, a second recessed pattern 131, and a third recessed pattern 141 at the same time. As shown in FIG21 , the orthographic projection of the second recessed pattern 131 on the first surface D coincides with the orthographic projection of the first recessed pattern 121 on the first surface D, and the orthographic projection of the third recessed pattern 141 on the first surface D coincides with the orthographic projection of the first recessed pattern 121 on the first surface D. The first recessed pattern 121, the second recessed pattern 131, and the third recessed pattern 141 can be manufactured simultaneously. The number of the second strip grooves n is the same as the number of the first strip grooves and is connected in a one-to-one correspondence. The number of the third strip grooves o is the same as the number of the first strip grooves and is in a one-to-one correspondence. The third strip grooves o run through the second adhesive layer 14.

[0129] For example, as shown in Figure 21, a first strip groove m in the isolation layer 12, a second strip groove n in the first adhesive layer 13, and a third strip groove o in the second adhesive layer 14 are connected to form a larger strip groove. This strip groove can be filled first with heat dissipation material, and then with a low-modulus material having a modulus lower than that of the first adhesive layer or the second adhesive layer. The present embodiment does not limit the position of the contact interface between the heat dissipation material and the low-modulus material perpendicular to the first direction x and the second direction y.

[0130] In summary, the following situations are included based on the formation of the first recessed pattern 121 in the isolation layer 12 located in the first transition region B1 and the second transition region B2:

[0131] The first type is that the first adhesive layer 13 and the second adhesive layer 14 are both integral layers, that is, there is no second recessed pattern 131 and no third recessed pattern 141 .

[0132] The second type is that a second recessed pattern 131 is provided in the first adhesive layer 13 located in the bending area A; or, a second recessed pattern 131 is provided in the first adhesive layer 13 located in the first transition area B1 and the second transition area B2; or, a third recessed pattern 141 is provided in the second adhesive layer 14 located in the bending area A; or, a third recessed pattern 141 is provided in the second adhesive layer 14 located in the first transition area B1 and the second transition area B2.

[0133] The third type is that a second recessed pattern 131 is provided in the first adhesive layer 13 located in the bending area A, and a third recessed pattern 141 is provided in the second adhesive layer 14 located in the bending area A; or, a second recessed pattern 131 is provided in the first adhesive layer 13 located in the first transition area B1 and the second transition area B2, and a third recessed pattern 141 is provided in the second adhesive layer 14 located in the first transition area B1 and the second transition area B2; or, a second recessed pattern 131 is provided in the first adhesive layer 13 located in the bending area A, and a third recessed pattern 141 is provided in the second adhesive layer 14 located in the first transition area B1 and the second transition area B2; or, a second recessed pattern 131 is also provided in the first adhesive layer 13 located in the first transition area B1 and the second transition area B2, and a third recessed pattern 141 is provided in the second adhesive layer 14 located in the bending area A.

[0134] In addition to the above embodiments, instead of forming the first recessed pattern 121 in the isolation layer 12 , the second recessed pattern 131 may be formed in the first adhesive layer 13 , and / or the third recessed pattern 121 may be formed in the second adhesive layer 14 , including the following situations:

[0135] The first type is that the second recessed pattern 131 is provided only on the first adhesive layer 13 located in the bending area A, or the second recessed pattern 131 is provided only on the first adhesive layer 13 located in the first transition area B1 and the second transition area B2, or the third recessed pattern 141 is provided only on the second adhesive layer 14 located in the bending area A, or the third recessed pattern 141 is provided only on the second adhesive layer 14 located in the first transition area B1 and the second transition area B2.

[0136] The second method is to provide a second concave pattern 131 on the first adhesive layer 13 located in the bending area A, and a third concave pattern 141 on the second adhesive layer 14 located in the bending area A. Alternatively, the second concave pattern 131 is provided on the first adhesive layer 13 located in the first transition area B1 and the second transition area B2, and a third concave pattern 141 is provided on the second adhesive layer 14 located in the first transition area B1 and the second transition area B2. Alternatively, the second concave pattern 131 is provided on the first adhesive layer 13 located in the bending area A, and a third concave pattern 141 is provided on the second adhesive layer 14 located in the first transition area B1 and the second transition area B2. Alternatively, the second concave pattern 131 is provided on the first adhesive layer 13 located in the first transition area B1 and the second transition area B2, and a third concave pattern 141 is provided on the second adhesive layer 14 located in the bending area A.

[0137] The arrangement of the second strip grooves n in the second recessed pattern 131 is as described above, and the arrangement of the third strip grooves o in the third recessed pattern 141 is as described above, which will not be repeated here.

[0138] In the above two cases, since the first recessed pattern 121 is not formed, the second recessed pattern 131 and the first recessed pattern 121 are not formed simultaneously, nor is the third recessed pattern 141 and the first recessed pattern 121. Therefore, the second recessed pattern 131 includes only one second stripe groove n, and the second stripe groove n passes through the first adhesive layer 13, and / or the third recessed pattern 141 includes only one third stripe groove o, and the third stripe groove o passes through the second adhesive layer 14.

[0139] It should be noted that when the support member is used for an inward-folding product, that is, when the second adhesive layer 14 is located outside the first adhesive layer 13 in the folded state, it is preferred to form the second recessed pattern 131. When the support member is used for an outward-folding product, that is, when the second adhesive layer 14 is located inside the first adhesive layer 13 in the folded state, it is preferred to form the third recessed pattern 141.

[0140] The structure of the support layer 11 is now described in an exemplary manner. Referring again to Figures 1 and 2 , the bending region A includes a third transition region A21, a bending center region A1, and a fourth transition region A22, which are sequentially connected in the first direction x. The third transition region A21 is located between the first transition region B1 and the bending center region A1, and the fourth transition region A22 is located between the bending center region A1 and the second transition region B2. Multiple hollow structures 111 within the support layer 11 are located in the bending center region A1. Hollow structures 111 extend through the support layer 11, ensuring excellent bendability.

[0141] Exemplarily, as shown in Figure 1, the support layer 11 also includes a plurality of recessed structures 112, which are located in the third transition zone A21 and the fourth transition zone A22. The recessed structures 11 do not penetrate the support layer 11 and are located on the side of the support layer 11 away from the first surface D, thereby minimizing the mold imprint caused by the support layer 11, improving the strength of the support member 1 in the bending zone A while taking into account the bendability.

[0142] In the embodiment shown in FIG1 , the distance between the hollow structure 111 in the bending center region A1 closest to the third transition region A21 and the recessed structure 112 in the third transition region A21 closest to the bending center region A1 is relatively large, and the distance between the hollow structure 111 in the bending center region A1 closest to the fourth transition region A22 and the recessed structure 112 in the fourth transition region A22 closest to the bending center region A1 is relatively large (e.g., approximately 5 mm to 15 mm), to prevent insufficient support force of the support member 1 located in the bending region A. In other possible embodiments, the distance between the hollow structure 111 in the bending center region A1 closest to the third transition region A21 and the recessed structure 112 in the third transition region A21 closest to the bending center region A1 is relatively small (e.g., approximately 0.5 mm to 5 mm), and the distance between the hollow structure 111 in the bending center region A1 closest to the fourth transition region A22 and the recessed structure 112 in the fourth transition region A22 closest to the bending center region A1 is relatively small.

[0143] Figure 22 is a schematic diagram illustrating the extent to which different support member designs, provided by embodiments of the present disclosure, affect the bending stress of the display panel or adhesive layer in a foldable display device. As shown in Figure 22, when the isolation layer 12 is made of a high-modulus material, the bending stress of both the display panel and the adhesive layer in the foldable display device is greater, particularly the display panel. When the isolation layer 12 is made of a low-modulus material, the bending stress of both the display panel and the adhesive layer in the foldable display device is less. When the first recessed pattern 121 is formed within the isolation layer 12, the bending stress of both the display panel and the adhesive layer in the foldable display device is less, similar to the bending stress when the isolation layer 12 is made of a low-modulus material. When the second recessed pattern 131 is formed within the first adhesive layer 13 of the support member, or the third recessed pattern 141 is formed within the second adhesive layer 14, the bending stress of both the display panel and the adhesive layer in the foldable display device is less, similar to the bending stress when the isolation layer 12 is made of a low-modulus material. In the test results shown in Figure 22, the test results corresponding to the recessed patterns formed in the isolation layer 12 and the first adhesive layer 13 refer to the test of a foldable display device including a support member 1 having the first and second recessed patterns 121, 131, but not the third recessed pattern 141. The structure of the support member 1 is shown in Figure 9. The test results corresponding to the recessed patterns formed in the first adhesive layer 13 refer to the test of a foldable display device including a support member 1 having the second recessed pattern 131, but not the first and third recessed patterns 121, 141. The second recessed pattern 131 in the support member 1 is located in the bending region A. It should be noted that the adhesive layer forces indicated on the horizontal axis refer to the forces acting on multiple adhesive layers within the foldable display device, including the first and second adhesive layers 13, 14 within the support member 1, as well as adhesive layers outside the support member, such as the adhesive layer between the cover plate and the polarizer, the adhesive layer between the polarizer and the display panel, and the adhesive layer between the display panel and the backing film.

[0144] FIG23 is a flow chart of a method for manufacturing a support member provided by an embodiment of the present disclosure. As shown in FIG23 , the method includes:

[0145] In step S1, a support layer is provided;

[0146] In step S2, an isolation layer is formed on the first surface of the support layer;

[0147] In which, the support member includes a first planar area, a bending area and a second planar area connected in sequence in a first direction, the extension direction of the bending area of ​​the support member is the second direction, the second direction intersects with the first direction, the support layer includes a plurality of hollow structures located in the bending area, the isolation layer is located in the first planar area, the bending area and the second planar area, the isolation layer includes a whole layer structure located in the bending area, the modulus of the isolation layer is 10GPa~250Gpa, and the thickness of the isolation layer is less than the thickness of the support layer.

[0148] The following is an exemplary description of step S2 using the structure shown in FIG1 as an example. For example, step S2 may include:

[0149] In the first step, a second adhesive layer 14 is formed on the support layer 11 by pasting. The second adhesive layer covers the bending area A, the first transition area B1, the second transition area B2, the first plane area C1 and the second plane area C2.

[0150] In the second step, a complete isolation layer 12 is formed by gluing the second adhesive layer 14. The isolation layer 12 covers the bending area A, the first transition area B1, the second transition area B2, the first planar area C1, and the second planar area C2. A first recessed pattern 121 is formed in the isolation layer 12 by laser cutting.

[0151] In the third step, a first adhesive layer 13 is formed on the isolation layer 12 by pasting to obtain the support member 1.

[0152] The following is an exemplary description of step S2 using the structure shown in FIG10 as an example. For example, step S2 may include:

[0153] In the first step, a second adhesive layer 14 is formed on the support layer 11 by pasting. The second adhesive layer covers the bending area A, the first transition area B1, the second transition area B2, the first plane area C1 and the second plane area C2.

[0154] In the second step, a complete isolation layer 12 is formed by gluing the second adhesive layer 14. The isolation layer 12 covers the bending area A, the first transition area B1, the second transition area B2, the first planar area C1, and the second planar area C2. A first recessed pattern 121 is formed in the isolation layer 12 by laser cutting.

[0155] In the third step, glue is applied in sections on top of the isolation layer 12 by die-cutting to form a first adhesive layer 13 to obtain the support member 1.

[0156] Figure 24 is a schematic cross-sectional view of a foldable display device provided by an embodiment of the present disclosure. As shown in Figure 24, the foldable display device includes a stacked display panel 3 and any of the aforementioned support members 1. The side of the support member 1 facing away from the support layer 11 is connected to the back surface of the display panel 3. Here, the back surface of the display panel 3 refers to the other surface of the display panel opposite the light-emitting surface.

[0157] Exemplarily, as shown in FIG24 , the foldable display device further includes a back film 2 , which is located between the display panel 3 and the support 1 , and is used to protect the display panel 3 .

[0158] Exemplarily, as shown in FIG24 , the foldable display device further includes a polarizer 4 and a cover plate 5 , wherein the polarizer 4 is located on a side of the display panel 3 away from the support member 1 , and the cover plate 5 is located on a side of the polarizer 4 away from the display panel 3 .

[0159] Exemplarily, the foldable display device also includes multiple adhesive layers, including an adhesive layer located between the back film 2 and the display panel 3, an adhesive layer located between the display panel 3 and the polarizer 4, and an adhesive layer located between the polarizer 4 and the cover plate 5. These adhesive layers are made of optical glue with high transparency.

[0160] Exemplarily, the foldable display decoration further includes a circuit board, which is located on a side of the support member 1 away from the display panel 3. The circuit board is used to supply power to the display panel.

[0161] Illustratively, the display device provided in the embodiments of the present disclosure may be any foldable product or component having a display function, such as a mobile phone, a tablet computer, a television, a monitor, or a laptop computer.

[0162] The foldable display device has the same effect as the aforementioned support member, which will not be described in detail here.

[0163] The above are merely optional embodiments of the present disclosure and are 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 support member, characterized in that: The support member (1) comprises a support layer (11) and an isolation layer (12) on a first surface of the support layer (11); The support layer (11) comprises a first plane area, a bending area, and a second plane area sequentially connected in a first direction, the length direction of the bending area is a second direction, the second direction intersects with the first direction, and the support layer (11) comprises a plurality of hollow structures (111) located in the bending area; The isolation layer (12) is located in the first plane area, the bending area, and the second plane area, and the isolation layer (12) covers the bending area; The modulus of the isolation layer (12) is 10 GPa to 250 GPa, and the thickness of the isolation layer (12) is smaller than the thickness of the support layer (11).

2. The support member according to claim 1, characterized in that The support member (1) further comprises a first transition zone and a second transition zone, wherein the first transition zone is located between the first plane zone and the bending zone, and the second transition zone is located between the bending zone and the second plane zone; The isolation layer (12) is also located in the first transition region and the second transition region, and the isolation layer (12) located in the first transition region and the isolation layer (12) located in the second transition region respectively have a first recessed pattern (121).

3. The support member according to claim 2, characterized in that The first concave pattern (121) comprises a first stripe groove, the size of the first stripe groove in the second direction is the same as the size of the isolation layer (12) in the second direction, and the depth of the first stripe groove is less than or equal to the thickness of the isolation layer (12).

4. The support member according to claim 2, characterized in that The first concave pattern (121) comprises a first stripe groove, and the length direction of the first stripe groove is the second direction, the size of the first stripe groove in the second direction is smaller than the size of the isolation layer (12) in the second direction, and the depth of the first stripe groove is the same as the thickness of the isolation layer (12).

5. The support member according to claim 2, characterized in that The first concave pattern (121) includes a plurality of first strip-shaped grooves arranged along the second direction, and the length direction of the first strip-shaped grooves is the second direction.

6. The support member according to any one of claims 2 to 5, characterized in that In the first direction, the first concave pattern (121) has a first reference point closest to the bending area and a second reference point farthest from the bending area, and the distance between the first reference point and the second reference point is 5 μm to 100 μm.

7. The support member according to claim 2, characterized in that The first recessed pattern (121) includes a plurality of first recessed structure groups (1210), the plurality of first recessed structure groups (1210) are arranged along the first direction, and each of the first recessed structure groups (1210) includes a plurality of first recessed structures arranged along the second direction, and the length direction of the first recessed structure is the second direction.

8. The support member according to claim 7, characterized in that The plurality of first concave structure groups (1210) include a first target concave structure group (1210a) and a second target concave structure group (1210b), wherein the first target concave structure group (1210a) and the second target concave structure group (1210b) are adjacent to each other, and the first target concave structure group (1210a) is located on a side of the second target concave structure group (1210b) away from the bending zone; The first recessed structure is a first strip-shaped groove, and the orthographic projections of two adjacent first strip-shaped grooves in the second target recessed structure group (1210b) on a reference surface respectively overlap with the orthographic projections of the first strip-shaped groove in the first target recessed structure group (1210a) on the reference surface, and the reference surface is perpendicular to the first surface and parallel to the second direction.

9. The support member according to claim 8, characterized in that The first target concave structure group (1210a) and the second target concave structure group (1210b) satisfy at least one of the following relationships: The number of first strip grooves in the first target recessed structure group (1210a) is less than or equal to the number of first strip grooves in the second target recessed structure group (1210b); The depth of the first strip-shaped groove in the first target recessed structure group (1210a) is less than or equal to the depth of the first strip-shaped groove in the second target recessed structure group (1210b); In the first direction, the size of the first strip groove in the first target recessed structure group (1210a) is The size of the first strip groove in the second target recessed structure group (1210b) is less than or equal to the size of the first strip groove; In the second direction, the size of the first strip-shaped groove in the first target recessed structure group (1210a) is smaller than or equal to the size of the first strip-shaped groove in the second target recessed structure group (1210b).

10. The support member according to any one of claims 7 to 9, characterized in that The distance between two adjacent first recessed structure groups (1210) is 5 μm to 20 μm.

11. The support member according to any one of claims 7 to 9, characterized in that In the first direction, the first concave pattern (121) has a first reference point closest to the bending area and a second reference point farthest from the bending area, and the distance between the first reference point and the second reference point is 0.1 mm to 10 mm.

12. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that In the first direction, the distance between one of the first strip grooves in the first concave pattern (121) closest to the bending area and one of the plurality of hollow structures (111) in the support layer (11) closest to the first concave pattern (121) is 2 mm to 20 mm; or, The support layer (11) further comprises a plurality of recessed structures (112), wherein the plurality of recessed structures (112) are located on both sides of the plurality of hollow structures (111) in the first direction, and in the first direction, a distance between one of the first strip-shaped grooves in the first recessed pattern (121) closest to the bending area and one of the recessed structures (112) in the support layer (11) closest to the first recessed pattern (121) is 2 mm to 20 mm.

13. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that The ratio of the depth of the first strip-shaped groove to the thickness of the isolation layer (12) is 1 / 3 to 1.

14. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that The isolation layer (12) is made of a metal material or an inorganic non-metallic material.

15. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that The support member (1) further comprises a plurality of first filling structures (122), wherein the plurality of first filling structures (122) are located in the first recessed pattern (121); The modulus of the first filling structure (122) is less than the modulus of the isolation layer (12).

16. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that The support member (1) further comprises a first adhesive layer (13), wherein the first adhesive layer (13) is located on a side of the isolation layer (12) away from the support layer (11); The first adhesive layer (13) located in the first transition region and the first adhesive layer (13) located in the second transition region respectively have a second concave pattern (131); The orthographic projection of the second concave pattern (131) on the first surface at least partially overlaps with the orthographic projection of the first concave pattern (121) on the first surface.

17. The support member according to claim 16, characterized in that The orthographic projection of the second concave pattern (131) on the first surface partially overlaps with the orthographic projection of the first concave pattern (121) on the first surface; the second concave pattern (131) includes a second strip groove, and the length direction of the second strip groove is the second direction; the size of the second strip groove in the second direction is equal to the size of the first adhesive layer (13) in the second direction; and the depth of the second strip groove is the same as the thickness of the first adhesive layer (13).

18. The support according to any one of claims 3 to 5 and claims 7 to 9, characterized in that The support member (1) further comprises a first adhesive layer (13), wherein the first adhesive layer (13) is located on a side of the isolation layer (12) away from the support layer (11); The first adhesive layer (13) located in the bending area has a second concave pattern (131).

19. The support member according to claim 18, characterized in that The second concave pattern (131) comprises a second strip-shaped groove, and the size of the second strip-shaped groove in the first direction is 1 mm to 30 mm.

20. The support member according to claim 17 or 19, characterized in that The support member (1) further comprises a second filling structure (132), wherein the second filling structure (132) is located in the second recessed pattern (131); The modulus of the second filling structure (132) is less than the modulus of the isolation layer (12).

21. The support member according to any one of claims 3 to 5, claims 7 to 9, claim 17 and claim 19, characterized in that The support member (1) further comprises a second adhesive layer (14), wherein the second adhesive layer (14) is located between the isolation layer (12) and the support layer (11); The second adhesive layer (14) located in the first transition region and the second adhesive layer (14) located in the second transition region respectively have a third concave pattern (141); The orthographic projection of the third concave pattern (141) on the first surface at least partially overlaps with the orthographic projection of the first concave pattern (121) on the first surface.

22. The support member according to claim 21, characterized in that The orthographic projection of the third recessed pattern (141) on the first surface coincides with the orthographic projection of the first recessed pattern (121) on the first surface, the third recessed pattern (141) comprises a plurality of third recessed structure groups (1410), the plurality of third recessed structure groups (1410) are arranged along the first direction, and each third recessed structure group (1410) comprises a plurality of third recessed structures arranged along the second direction; The plurality of third recessed structure groups (1410) include a third target recessed structure group (1410a) and a fourth target recessed structure group (1410b), wherein the third target recessed structure group (1410a) and the fourth target recessed structure group (1410b) are adjacent to each other, and the third target recessed structure group (1410a) is located on a side of the fourth target recessed structure group (1410b) away from the bending zone; The depth of the third recessed structure in the third target recessed structure group (1410a) is smaller than the depth of the third recessed structure in the fourth target recessed structure group (1410b).

23. The support member according to claim 21, characterized in that The orthographic projection of the third recessed pattern (141) on the first surface partially overlaps with the orthographic projection of the first recessed pattern (121) on the first surface. The third recessed pattern (141) includes a third stripe groove. The dimension of the third stripe groove in the second direction is equal to the dimension of the second adhesive layer (14) in the second direction. The depth of the third stripe groove is the same as the thickness of the second adhesive layer (14).

24. A support according to any one of claims 3 to 5, claims 7 to 9, claim 17 and claim 19, characterized in that The support member (1) further comprises a second adhesive layer (14), wherein the second adhesive layer (14) is located between the isolation layer (12) and the support layer (11); The second adhesive layer (14) located in the bending area has a third concave pattern (141).

25. The support member according to claim 24, characterized in that The third concave pattern (141) comprises a third strip-shaped groove, and the size of the third strip-shaped groove in the first direction is 1 mm to 30 mm.

26. Support according to claims 22 to 23 and claim 25, characterized in that The support member (1) further comprises a third filling structure (142), wherein the third filling structure (142) is located in the third recessed pattern (141); The modulus of the third filling structure (142) is smaller than the modulus of the isolation layer (12), or the modulus of the third filling structure (142) is smaller than the modulus of the isolation layer (12) and the thermal conductivity of the third filling structure (142) is greater than or equal to 110w / (m*k).

27. The support member according to claim 1, characterized in that The support member (1) further comprises a first transition zone and a second transition zone, wherein the first transition zone is located between the first plane zone and the bending zone, and the second transition zone is located between the bending zone and the second plane zone. The isolation layer (12) is also located in the first transition zone and the second transition zone, and the isolation layer (12) is a whole-layer structure. The support member (1) further comprises a first adhesive layer (13) and a second adhesive layer (14), wherein the first adhesive layer (13) is located on a side of the isolation layer (12) away from the support layer (11), and the second adhesive layer (14) is located between the isolation layer (12) and the support layer (11); The first adhesive layer (13) located in the first transition zone and the first adhesive layer (13) located in the second transition zone respectively have a second concave pattern (131), or the first adhesive layer (13) located in the bending zone has a second concave pattern (131); and / or, The second adhesive layer (14) located in the first transition zone and the second adhesive layer (14) located in the second transition zone respectively have a third concave pattern (141), or the second adhesive layer (14) located in the bending zone has a third concave pattern (141).

28. A method for manufacturing a support member, characterized in that: The method comprises: Provide a support layer; forming an isolation layer on the first surface of the support layer; In which, the support member includes a first planar area, a bending area and a second planar area connected in sequence in a first direction, the extension direction of the bending area of the support member is a second direction, the second direction intersects with the first direction, the support layer includes a plurality of hollow structures located in the bending area, the isolation layer is located in the first planar area, the bending area and the second planar area, the isolation layer includes a whole layer structure located in the bending area, the modulus of the isolation layer is 10GPa~250Gpa, and the thickness of the isolation layer is less than the thickness of the support layer.

29. A foldable display device, characterized in that: The foldable display device comprises a stacked display panel and a support member according to any one of claims 1 to 27, wherein a side of the support member (1) away from the supporting layer (11) is connected to the back side of the display panel (3).

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