Support structure and display apparatus

Abstract

The present disclosure relates to the technical field of display. Disclosed are a support structure and a display apparatus. The support structure is disposed on a non-display side of a flexible display panel. The support structure is provided with a bendable region, and comprises a support plate and an adhesion improvement layer. The support plate is provided with a plurality of hollow holes in the bendable region. The adhesion improvement layer is disposed on the side of the support plate facing away from the flexible display panel. The adhesion improvement layer is at least located in at least part of the bendable region. A surface tension coefficient of the adhesion improvement layer is greater than a surface tension coefficient of the support plate, and the surface tension coefficient of the adhesion improvement layer is greater than or equal to 38 mN / m and less than or equal to 42 mN / m. In the support structure, the adhesion performance of the adhesion improvement layer is stronger than the adhesion performance of the support plate, such that adhesion between the support structure and a structure adhered thereto is firmer, thereby avoiding defects such as adhesive failure or debonding between the support structure and the structure adhered thereto.

Description

Support structure and display device

[0001] Cross-references

[0002] This disclosure claims priority to Chinese Patent Application No. 202411936124.0, filed on December 25, 2024, entitled “Support Structure and Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of display technology, and more specifically, to a support structure and a display device. Background Technology

[0004] With the development of display technology, foldable, rollable, and flexible display devices are gradually coming into consumers' view. In order to facilitate the bending or restoring of display devices, it is necessary to make display devices thinner and lighter.

[0005] Currently, as the bending radius of display devices becomes smaller and smaller, poor adhesion between the supporting structure and the structure it is bonded to is prone to occur.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this disclosure is to overcome the shortcomings of the prior art and to provide a support structure and a display device.

[0008] According to one aspect of this disclosure, a support structure is provided disposed on the non-display side of a flexible display panel, the support structure having a bendable region, the support structure comprising:

[0009] A support plate, in the bendable area, has multiple perforated holes;

[0010] An adhesion improvement layer is disposed on the side of the support plate opposite to the flexible display panel. The adhesion improvement layer is located in at least a portion of the bendable area. The surface tension coefficient of the adhesion improvement layer is greater than that of the support plate. The surface tension coefficient of the adhesion improvement layer is greater than or equal to 38 mN / m and less than or equal to 42 mN / m.

[0011] In one exemplary embodiment of this disclosure, the adhesive improvement layer is made of ink.

[0012] In one exemplary embodiment of this disclosure, the ink has a particle size greater than or equal to 10 micrometers and less than or equal to 15 micrometers.

[0013] In one exemplary embodiment of this disclosure, the support structure further has a non-bending region located on at least one side of the bendable region, and the adhesion improvement layer is also located in a portion of the non-bending region adjacent to the bendable region.

[0014] In one exemplary embodiment of this disclosure, the bendable region includes:

[0015] The first bendable area has multiple first hollow holes provided on the support plate.

[0016] At least one second sub-bendable region is provided on the side of the first sub-bendable region near the non-bendable region. In the second sub-bendable region, a plurality of second perforated holes are provided on the support plate, and the density of the first perforated holes is greater than the density of the second perforated holes.

[0017] In one exemplary embodiment of this disclosure, the ratio of the opening area of ​​the first hollow hole to the opening area of ​​the second hollow hole is greater than or equal to 1.2 and less than or equal to 2.

[0018] In one exemplary embodiment of this disclosure, the support structure further includes:

[0019] A buffer layer is disposed on the side of the support plate opposite to the flexible display panel and is located in at least a portion of the bendable area.

[0020] In one exemplary embodiment of this disclosure, the buffer layer is provided with a plurality of venting holes.

[0021] In an exemplary embodiment of this disclosure, when the buffer layer overlaps with the adhesion improvement layer, the buffer layer is disposed on the side of the adhesion improvement layer that faces away from the flexible display panel.

[0022] In one exemplary embodiment of this disclosure, the support plate includes a first carbon fiber layer and a second carbon fiber layer stacked together, wherein the flexural modulus of the second carbon fiber layer is greater than that of the first carbon fiber layer.

[0023] In one exemplary embodiment of this disclosure, the support plate further includes a third carbon fiber layer disposed on the side of the second carbon fiber layer opposite to the first carbon fiber layer, and the flexural modulus of the second carbon fiber layer is greater than that of the third carbon fiber layer.

[0024] In one exemplary embodiment of this disclosure, the flexural modulus of the first carbon fiber layer is equal to the flexural modulus of the third carbon fiber layer.

[0025] According to another aspect of this disclosure, a display device is provided, comprising:

[0026] Flexible display panel;

[0027] The support structure is any one of the support structures described above, and the support structure is disposed on the non-display side of the flexible display panel;

[0028] The first adhesive layer is bonded between the support structure and the flexible display panel.

[0029] In one exemplary embodiment of this disclosure, the material of the first adhesive layer is pure adhesive.

[0030] In one exemplary embodiment of this disclosure, the thickness of the first adhesive layer is greater than or equal to 10 micrometers and less than or equal to 20 micrometers.

[0031] In one exemplary embodiment of this disclosure, the display device is a foldable display device, and the display device further includes:

[0032] A mid-frame assembly is disposed on the side of the support structure opposite to the adhesive improvement layer and the support plate;

[0033] The second adhesive layer is bonded between the mid-frame assembly, the adhesive improvement layer, and the side of the support plate facing away from the flexible display panel.

[0034] In one exemplary embodiment of this disclosure, the bending radius of the flexible display panel is greater than or equal to 1 mm and less than 2 mm.

[0035] In one exemplary embodiment of this disclosure, the bending radius of the flexible display panel is 1.35 mm.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0038] Figure 1 is a schematic diagram of an example embodiment of the display device of this disclosure.

[0039] Figure 2 is a schematic diagram of another example embodiment of the display device disclosed herein.

[0040] Figure 3 is a schematic diagram of the supporting structure in Figure 1.

[0041] Figure 4 is a schematic diagram of the supporting structure in Figure 2.

[0042] Figure 5 is a schematic diagram of the support plate in Figure 3.

[0043] Figure 6 is a schematic diagram of the support plate in Figure 4.

[0044] Figure 7 is a schematic diagram of another example embodiment of the support structure in Figure 1.

[0045] Figure 8 is a schematic diagram of an example embodiment of the support structure of this disclosure.

[0046] Figure 9 is a schematic diagram of another example embodiment of the support structure of this disclosure.

[0047] Figure 10 is a schematic diagram of another example embodiment of the support structure of this disclosure.

[0048] Figure 11 is a schematic diagram of an example embodiment of the support plate in the support structure of this disclosure.

[0049] Figure 12 is a schematic diagram of another example embodiment of the support plate in the support structure of this disclosure.

[0050] Explanation of reference numerals in the attached drawings: 1. Flexible display panel; 2. First adhesive layer; 3. Support structure; 31. Support plate; 31a. Hole; 311. First carbon fiber layer; 312. Second carbon fiber layer; 313. Third carbon fiber layer; 32. Adhesion improvement layer; 33. Buffer layer; 331. Vent hole; 31ZW. Bendable area; 31ZW1. First sub-bendable area; 31ZW11. First hole; 31ZW2. Second sub-bendable area; 31ZW21. Second hole; 31FZW. Non-bendable area; 4. Rotating shaft; 5. Middle frame assembly; 51. Middle frame; 52. Hinge structure; 61. Sliding support strip; 62. Sliding support plate; 7. Second adhesive layer; X. First direction; Y. Second direction. Detailed Implementation

[0051] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0052] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0053] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0054] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0055] This disclosure provides a support structure 3. Referring to Figures 1-12, the support structure 3 is disposed on the non-display side of the flexible display panel 1. The support structure 3 has a bendable region 31ZW. The support structure 3 may include a support plate 31 and an adhesive improvement layer 32. In the bendable region 31ZW, a plurality of perforations 31a are provided on the support plate 31. The adhesive improvement layer 32 is disposed on the side of the support plate 31 away from the flexible display panel 1. The adhesive improvement layer 32 is located in at least a portion of the bendable region 31ZW. The surface tension coefficient of the adhesive improvement layer 32 is greater than the surface tension coefficient of the support plate 31. The surface tension coefficient of the adhesive improvement layer 32 is greater than or equal to 38 mN / m and less than or equal to 42 mN / m.

[0056] The support structure 3 disclosed herein has a surface tension coefficient that is greater than that of the support plate 31. This makes it easier to wet the second adhesive layer 7 after it is applied to the adhesive improvement layer 32, resulting in a smaller contact angle between the second adhesive layer 7 and the adhesive improvement layer 32. This allows the second adhesive layer 7 to adhere firmly to the surface of the adhesive improvement layer 32, thereby strengthening the bond between the support structure 3 and the structure it is bonded to, and preventing defects such as delamination or peeling between the support structure 3 and the structure it is bonded to. On the other hand, the surface tension coefficient of the adhesive improvement layer 32 is greater than or equal to 38 mN / m and less than or equal to 42 mN / m. This not only prevents defects such as delamination or peeling between the support structure 3 and the structure it is bonded to, but also facilitates the selection of materials for the adhesive improvement layer 32 without increasing costs.

[0057] Referring to Figures 1 and 2, the display device may include a support structure 3, a first adhesive layer 2, and a flexible display panel 1; the support structure 3 and the flexible display panel 1 are bonded and fixed together by the first adhesive layer 2.

[0058] Referring to FIG1, the display device is a foldable display device. The display device may also include a mid-frame assembly 5. The mid-frame assembly 5 may include two mid-frames 51 and a hinge structure 52 connecting the two mid-frames 51. The mid-frame assembly 5 may be bonded to the side of the support structure 3 away from the flexible display panel 1 by a second adhesive layer 7.

[0059] Referring to Figure 2, the display device is a sliding display device. The display device may also include a sliding support plate 62 and multiple sliding support bars 61. The sliding support plate 62 and multiple sliding support bars 61 can be bonded to the side of the support structure 3 away from the flexible display panel 1 through the second adhesive layer 7.

[0060] In this example embodiment, the support structure 3 is used to protect and support the flexible display panel 1. The support structure 3 is located on the non-display side of the flexible display panel 1. The shape of the support structure 3 can be the same as the shape of the flexible display panel 1. For example, if the flexible display panel 1 is rectangular, the support structure 3 is also rectangular; if the flexible display panel 1 is circular, the support structure 3 is also circular; the shapes of the flexible display panel 1 and the support structure 3 can also be other, which will not be described in detail here.

[0061] Since the flexible display panel 1 needs to achieve functions such as folding, sliding, or rolling to change the area of ​​the display surface, the flexible display panel 1 has a bendable area. Correspondingly, the support structure 3 also has a bendable area 31ZW. The bendable area of ​​the panel and the bendable area 31ZW of the support structure 3 are directly opposite each other. When both the flexible display panel 1 and the support structure 3 are in a flattened state, the edge of the orthographic projection of the bendable area of ​​the panel onto the support structure 3 can be aligned with the edge of the bendable area 31ZW. Alternatively, the orthographic projection of the bendable area of ​​the panel onto the support structure 3 is located within the bendable area 31ZW, and the distance between the edge of the orthographic projection of the bendable area of ​​the panel onto the support structure 3 and the edge of the bendable area 31ZW is not zero. That is, the area of ​​the bendable area 31ZW of the support structure 3 can be greater than or equal to the area of ​​the bendable area of ​​the panel, so as to avoid the support structure 3 from affecting the bending performance of the flexible display panel 1 in the bendable area of ​​the panel, and to ensure the bending performance of the flexible display panel 1 in the bendable area of ​​the panel.

[0062] To achieve better folding, sliding, or rolling performance in the display device, it is necessary to reduce the thickness of some of the stacked film layers. Specifically, the thickness of the first adhesive layer 2 can be reduced. For example, the thickness of the first adhesive layer 2 can be greater than or equal to 10 micrometers and less than or equal to 20 micrometers, such as 12 micrometers, 15 micrometers, 17 micrometers, etc. Moreover, the material of the first adhesive layer 2 is pure adhesive, that is, the material of the first adhesive layer 2 does not include the base layer, and the material of the base layer can be polyimide (PI).

[0063] This configuration allows the bending radius R of the display device to be greater than or equal to 1 mm and less than 2 mm. For example, the bending radius R of the display device can reach 1.2 mm, 1.35 mm, 1.5 mm, 1.7 mm, 1.85 mm, etc., making the bending radius R of the display device reach its lowest level ever.

[0064] Of course, in other exemplary embodiments of this disclosure, the thickness of other film layers of the display device may also be reduced, which will not be described in detail here.

[0065] However, a small bending radius and a thinner first adhesive layer 2 will result in greater bending stress and poorer bending performance of each layer of the display device at the same bending angle.

[0066] For example, stronger bending stress leads to higher requirements for the adhesion performance between the support structure 3 and the structure bonded to it in the bendable area 31ZW. Current display devices are prone to adhesion failure between the support structure 3 and the structure bonded to it, i.e., delamination or peeling between the support structure 3 and the structure bonded to it. For example, in foldable display devices, delamination or peeling between the support structure 3 and the mid-frame assembly 5 is prone to occur; in roll-up display devices, delamination or peeling between the support structure 3 and the roll-up support plate 62 and the multiple roll-up support strips 61 is prone to occur. In addition, the thickness of the first adhesive layer 2 is relatively thin, which reduces the ability of the first adhesive layer 2 to absorb step differences. When the display device is in a bent state, defects such as mold marks are prone to occur in the bendable area 31ZW of the flexible display panel 1.

[0067] In this example embodiment, the support structure 3 may include a support plate 31, and a plurality of perforated holes 31a are provided on the support plate 31 in the bendable region 31ZW.

[0068] Generally, the support structure 3 is one of the thickest layers among all the laminated film layers in the display device; for example, the support structure 3 is the thickest among all the laminated film layers in the display device. The support structure 3 is used to protect and support the flexible display panel 1; therefore, the support plate 31 needs to be made of a material with high strength. Simultaneously, in the bendable area 31ZW, multiple perforations 31a are provided on the support plate 31 to ensure that the support structure 3 has good bending performance and reduces bending stress. However, the perforations 31a reduce the area of ​​the support structure 3, thereby reducing the bonding area between the support structure 3 and the middle frame assembly 5, or between the support structure 3 and the sliding support plate 62 and the sliding support strips 61. This further leads to poor adhesion or peeling between the support structure 3 and the middle frame assembly 5, or poor adhesion or peeling between the support structure 3 and the sliding support plate 62 and the multiple sliding support strips 61.

[0069] In this exemplary embodiment, referring to Figures 3 and 4, an adhesion improvement layer 32 is provided on the side of the support plate 31 facing away from the flexible display panel 1. The adhesion improvement layer 32 is located at least in at least a portion of the bendable region 31ZW. For example, the adhesion improvement layer 32 may be located in a portion of the bendable region 31ZW, or it may be located in the entire bendable region 31ZW, or it may be located in the entire bendable region 31ZW and other regions. The surface tension coefficient of the adhesion improvement layer 32 is greater than that of the support plate 31.

[0070] The surface tension coefficient is commonly referred to as surface tension or dyne value. Surface energy, dyne value, and contact angle are all methods for evaluating the wettability of solid surfaces. The higher the surface free energy of a solid, the better the liquid can wet the solid surface, and the smaller the contact angle; while the lower the surface free energy of a solid, the less well the liquid can wet the solid surface, and the larger the contact angle.

[0071] Specifically, wettability refers to the ability of a liquid to spread on a solid surface. Good wettability means that the liquid can evenly cover the solid surface. The relationship between dyne value and wettability: a high dyne value generally indicates better wettability. When the dyne value is high, the surface energy of the material is greater, and the liquid spreads more easily on the surface, forming a continuous and uniform liquid film.

[0072] Adhesion refers to the bond strength between two different substances at an interface. It is crucial in the application of composite materials, adhesives, and coatings. The relationship between dyne value and adhesion: a high dyne value generally indicates better adhesion. A high dyne value on a material surface indicates a large surface energy, which helps adhesives or coatings adhere firmly to the surface. Conversely, a low dyne value may lead to adhesion failure, resulting in problems such as delamination or peeling.

[0073] Surface energy refers to the energy required to create a new surface of a material, and it is directly related to the material's adhesion and wetting properties. The relationship between dynes and surface energy: Dynes are essentially a characterization of surface tension, which is closely related to surface energy. Generally speaking, a high dyne value represents high surface energy, which helps improve the material's adhesion and wetting properties. Conversely, a low dyne value indicates lower surface energy, which may lead to weak adhesion and poor wetting.

[0074] The surface tension coefficient of the bonding improvement layer 32 is greater than that of the support plate 31, resulting in stronger adhesive performance of the bonding improvement layer 32 compared to the support plate 31. Specifically, after the second adhesive layer 7 is applied to the bonding improvement layer 32, it is easier to wet and forms a smaller contact angle with the bonding improvement layer 32. This allows the second adhesive layer 7 to adhere firmly to the surface of the bonding improvement layer 32, thereby making the bond between the support structure 3 and the structure it is bonded to stronger and preventing defects such as delamination or peeling from the support structure 3. For example, in foldable display devices, this prevents defects such as delamination or peeling between the support structure 3 and the mid-frame assembly 5; in sliding display devices, it prevents defects such as delamination or peeling between the support structure 3 and the sliding support plate 62 and the multiple sliding support strips 61.

[0075] Alternatively, the surface tension coefficient of the bonding improvement layer 32 is greater than or equal to 38 mN / m and less than or equal to 42 mN / m. For example, the surface tension coefficient of the bonding improvement layer 32 can be 38.5 mN / m, 39 mN / m, 39.5 mN / m, 40 mN / m, 40.5 mN / m, 41 mN / m, 41.5 mN / m, etc.

[0076] If the surface tension coefficient of the bonding improvement layer 32 is too small, it will not have a significant effect on improving the bonding performance; if the surface tension coefficient of the bonding improvement layer 32 is too large, it will be detrimental to the selection of materials for the bonding improvement layer 32, leading to increased costs.

[0077] The above-mentioned numerical range can not only effectively improve the bonding performance, so that the second adhesive layer 7 can be firmly attached to the surface of the adhesive improvement layer 32, avoiding defects such as delamination or peeling between the support structure 3 and the structure it is bonded to; but also facilitates the selection of materials for the adhesive improvement layer 32 without increasing costs.

[0078] Furthermore, uniformity refers to the consistency and continuity of the liquid or film coated on the material surface. The relationship between dyne value and uniformity: an appropriate dyne value ensures that the coating liquid is evenly distributed on the material surface, forming a defect-free coating. If the dyne value is too low, the coating may exhibit sagging, orange peel, or other defects, affecting the product's quality and performance. The aforementioned numerical range ensures the consistency and continuity of the subsequently formed second adhesive layer 7, thereby guaranteeing the consistency and strength of the bond between the supporting structure 3 and the structure it is bonded to.

[0079] The surface tension of the support plate 31 is greater than or equal to 30 dynes / cm and less than or equal to 37 dynes / cm. For example, the dyne value coefficient of the support plate 31 can be 32 dynes / cm, 34 dynes / cm, 35 dynes / cm, 36 dynes / cm, etc.

[0080] Since 1 dyne = 10 -5 N, therefore, 30 dynes / cm is 30 mN / m, and 37 dynes / cm is 37 mN / m.

[0081] In some exemplary embodiments of this disclosure, the adhesion improvement layer 32 can be made of ink. The ink can be formed on the side of the support plate 31 opposite to the flexible display panel 1 by spraying, rather than by pad printing. Then, a baking process is used to cure the liquid ink to form a solid adhesion improvement layer 32. The adhesion improvement layer 32 formed by spraying prevents ink accumulation, resulting in a smoother surface.

[0082] Alternatively, the ink particle size is greater than or equal to 10 micrometers and less than or equal to 15 micrometers. For example, the ink particle size can be 10.5 micrometers, 11 micrometers, 11.5 micrometers, 12 micrometers, 12.5 micrometers, 13 micrometers, 13.5 micrometers, 14 micrometers, 14.5 micrometers, etc.

[0083] If the ink particles are too large, they can easily accumulate, resulting in insufficient smoothness of the formed adhesion improvement layer 32. If the ink particles are too small, it is not conducive to the selection of ink materials, leading to increased costs.

[0084] The above-mentioned numerical range not only prevents ink accumulation, resulting in a smoother adhesive improvement layer 32, but also facilitates the selection of ink materials without increasing costs.

[0085] Of course, in some other exemplary embodiments of this disclosure, the material of the adhesion improvement layer 32 may also be a substance with high adhesion and high surface energy, such as epoxy coating, polyurethane coating, acrylic coating, etc., to improve the dyne value.

[0086] The thickness of the bonding improvement layer 32 is greater than or equal to 0.003 mm and less than or equal to 0.005 mm. For example, the thickness of the bonding improvement layer 32 can be 0.0032 mm, 0.0035 mm, 0.0037 mm, 0.004 mm, 0.0043 mm, 0.0045 mm, 0.0048 mm, etc.

[0087] In some exemplary embodiments of this disclosure, referring to Figures 3 and 4, the support structure 3 further includes a non-bending region 31FZW, which is disposed on at least one side of the bendable region 31ZW. For example, referring to Figure 4, for a rollable display device, the non-bending region 31FZW can be one, disposed on one side of the bendable region 31ZW. Specifically, the non-bending region 31FZW is connected to one side of the bendable region 31ZW. Referring to Figure 3, for a foldable display device, the non-bending region 31FZW can be two, disposed on opposite sides of the bendable region 31ZW. Specifically, the two non-bending regions 31FZW are connected to opposite sides of the bendable region 31ZW.

[0088] Because stress abrupt changes occur at the connection between the non-bending region 31FZW and the bendable region 31ZW, poor adhesion between the support structure 3 and the structure bonded to it is also prone to occur in a part of the non-bending region 31FZW close to the bendable region 31ZW. That is, poor adhesion or delamination between the support structure 3 and the structure bonded to it is prone to occur.

[0089] The adhesion improvement layer 32 is also located in a part of the non-bending region 31FZW near the bendable region 31ZW. This allows the second adhesive layer 7 to be applied to the adhesion improvement layer 32 in the part of the non-bending region 31FZW near the bendable region 31ZW. This makes the second adhesive layer 7 easier to wet and allows it to form a smaller contact angle with the adhesion improvement layer 32. This enables the second adhesive layer 7 to adhere firmly to the surface of the adhesion improvement layer 32, thereby making the bond between the support structure 3 and the structure it is bonded to stronger and preventing defects such as delamination or peeling between the support structure 3 and the structure it is bonded to.

[0090] Specifically, the adhesion improvement layer 32 may include a first portion and at least one second portion. The first portion is located in the bendable region 31ZW, and the second portion is located in a portion of the non-bendable region 31FZW near the bendable region 31ZW. The ratio of the width of the first portion in the first direction X to the width of the second portion in the first direction X is greater than or equal to 1 and less than or equal to 5. For example, the ratio of the width of the first portion in the first direction X to the width of the second portion in the first direction X may be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, etc.

[0091] If the ratio of the width of the first part in the first direction X to the width of the second part in the first direction X is too small, the width of the second part in the first direction X will be too large, and the second part will easily interfere with other components; if the ratio of the width of the first part in the first direction X to the width of the second part in the first direction X is too large, the width of the second part in the first direction X will be too small, resulting in poor improvement of the bonding effect of the bonding improvement layer 32 on the non-bending area 31FZW, which cannot meet the requirements.

[0092] It should be noted that the first direction X is the connection direction between the first part and the second part, or it can be said that the first direction X is the connection direction between the non-bending region 31FZW and the bendable region 31ZW; and both are in the flattened state, rather than in the bent or curled state.

[0093] In some exemplary embodiments of this disclosure, referring to Figures 5 and 6, the bendable region 31ZW may include a first sub-bendable region 31ZW1 and at least one second sub-bendable region 31ZW2, wherein the second sub-bendable region 31ZW2 is disposed on the side of the first sub-bendable region 31ZW1 near the non-bendable region 31FZW; specifically, for example, referring to Figure 5, for a foldable display device, there may be two non-bendable regions 31FZW and two second sub-bendable regions 31ZW2, wherein the two second sub-bendable regions 31ZW2 are disposed on the first sub-bendable region 31ZW1 near the non-bendable region. One side of the domain 31FZW, namely the two second sub-bendable regions 31ZW2, is located on opposite sides of the first sub-bendable region 31ZW1 in the first direction X. The two non-bendable regions 31FZW are connected one-to-one to the side of the two second sub-bendable regions 31ZW2 away from the first sub-bendable region 31ZW1. Referring to FIG6, for the sliding display device, the non-bendable region 31FZW can be set to one, the second sub-bendable region 31ZW2 can be set to one, and the non-bendable region 31FZW, the second sub-bendable region 31ZW2, and the first sub-bendable region 31ZW1 are connected sequentially along the first direction X.

[0094] When the bending radius R is 1.35 mm, the width of the first sub-bendable region 31ZW1 in the first direction X is approximately 9.37 mm. The width of the first sub-bendable region 31ZW1 in the first direction X increases with the increase of the bending radius R.

[0095] In the first bendable region 31ZW1, multiple first perforated holes 31ZW11 are provided on the support plate 31. In the second bendable region 31ZW2, multiple second perforated holes 31ZW21 are provided on the support plate 31. Thus, the entire bendable region 31ZW is provided with perforated holes 31a, and there are no areas without holes in the bendable region 31ZW. It can be understood that the area between adjacent perforated holes 31a is for dividing the solid structure formed by the perforated holes 31a and cannot be called a hole-free area. Furthermore, the width of the solid structure between the first perforated hole 31ZW11 and the adjacent second perforated hole 31ZW21 is less than or equal to the width of the solid structure between two adjacent second perforated holes 31ZW21, so that the entire bendable region 31ZW is provided with perforated holes 31a, and there are no areas without holes in the bendable region 31ZW.

[0096] The density of the first perforated hole 31ZW11 is greater than that of the second perforated hole 31ZW21, so that the second sub-bendable region 31ZW2 forms a transition region between the first sub-bendable region 31ZW1 and the non-bendable region 31FZW. This makes the stress of the non-bendable region 31FZW, the second sub-bendable region 31ZW2, and the first sub-bendable region 31ZW1 change more evenly, avoiding hard-angle bending due to stress abrupt changes during bending. This avoids defects such as separation and cracking between the flexible display panel 1 and the support structure 3, and also avoids defects such as delamination or peeling between the support structure 3 and the structure it is bonded to. Moreover, it can be applied to flexible display devices with a small bending radius.

[0097] Specifically, in the first direction X, the distance between two adjacent first hollow holes 31ZW11 is greater than or equal to 0.25 mm and less than or equal to 0.35 mm. For example, the distance between two adjacent first hollow holes 31ZW11 can be 0.28 mm, 0.3 mm, 0.32 mm, etc. In the second direction Y, the distance between two adjacent first hollow holes 31ZW11 is greater than or equal to 0.1 mm and less than or equal to 0.2 mm. For example, the distance between two adjacent first hollow holes 31ZW11 can be 0.12 mm, 0.15 mm, 0.17 mm, etc.

[0098] In the first direction X, the distance between two adjacent second hollow holes 31ZW21 is greater than or equal to 0.5 mm and less than or equal to 0.7 mm. For example, the distance between two adjacent second hollow holes 31ZW21 can be 0.55 mm, 0.6 mm, 0.65 mm, etc. In the second direction Y, the distance between two adjacent second hollow holes 31ZW21 is greater than or equal to 0.5 mm and less than or equal to 0.7 mm. For example, the distance between two adjacent second hollow holes 31ZW21 can be 0.55 mm, 0.6 mm, 0.65 mm, etc.

[0099] Optionally, the opening area of ​​the first hollow hole 31ZW11 is greater than the opening area of ​​the second hollow hole 31ZW21. Specifically, the ratio of the opening area of ​​the first hollow hole 31ZW11 to the opening area of ​​the second hollow hole 31ZW21 is greater than or equal to 1.2 and less than or equal to 2. For example, the ratio of the opening area of ​​the first hollow hole 31ZW11 to the opening area of ​​the second hollow hole 31ZW21 can be 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, etc.

[0100] If the ratio of the opening area of ​​the first hollow hole 31ZW11 to the opening area of ​​the second hollow hole 31ZW21 is too small, the stress change between the second sub-bendable region 31ZW2 and the first sub-bendable region 31ZW1 will be too small. During bending, the edge of the second sub-bendable region 31ZW2 away from the first sub-bendable region 31ZW1 will still experience a hard angle bend due to the sudden change in stress.

[0101] If the ratio of the opening area of ​​the first hollow hole 31ZW11 to the opening area of ​​the second hollow hole 31ZW21 is too large, the stress change between the second sub-bendable region 31ZW2 and the first sub-bendable region 31ZW1 will be too large. During bending, a hard angle bend will also occur at the connection between the second sub-bendable region 31ZW2 and the first sub-bendable region 31ZW1 due to the sudden change in stress.

[0102] This configuration further ensures that the stress in the second sub-bendable region 31ZW2 and the first sub-bendable region 31ZW1 varies more evenly, avoiding hard-angle bending due to sudden stress changes during bending. This further prevents defects such as separation and cracking between the flexible display panel 1 and the support structure 3, and also prevents defects such as delamination or peeling between the support structure 3 and the structure it is bonded to. Moreover, it can be applied to flexible display devices with smaller bending radii.

[0103] Specifically, in the first direction X, the opening width of the first perforated hole 31ZW11 is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. For example, the opening width of the first perforated hole 31ZW11 can be 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.085 mm, 0.09 mm, or 0.095 mm. In the second direction Y, the opening length of the first perforated hole 31ZW11 is greater than or equal to 2 mm and less than or equal to 3 mm. For example, the opening length of the first perforated hole 31ZW11 can be 2.1 mm, 2.26 mm, 2.5 mm, 2.7 mm, 2.85 mm, etc.

[0104] In the first direction X, the opening width of the second perforated hole 31ZW21 is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. For example, the opening width of the second perforated hole 31ZW21 can be 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.085 mm, 0.09 mm, or 0.095 mm. In the second direction Y, the opening length of the second perforated hole 31ZW21 is greater than or equal to 1 mm and less than or equal to 2 mm. For example, the opening length of the second perforated hole 31ZW21 can be 1.2 mm, 1.43 mm, 1.5 mm, 1.6 mm, 1.85 mm, etc.

[0105] Referring to Figure 5, multiple first hollow holes 31ZW11 are arranged along the first direction X to form a column of first hollow holes. Multiple columns of first hollow holes are arranged along the second direction Y. The first hollow holes in two adjacent columns are staggered, and the first hollow holes 31ZW11 in the two columns of first hollow holes have overlapping parts in the first direction X. That is, the first hollow holes 31ZW11 in one column extend to the space between two adjacent first hollow holes 31ZW11 in another adjacent column.

[0106] Multiple second hollow holes 31ZW21 are arranged along the first direction X to form a column of second hollow holes. Multiple columns of second hollow holes are arranged along the second direction Y. The adjacent columns of second hollow holes are staggered, and the second hollow holes 31ZW21 in the two columns of second hollow holes have basically no overlapping parts in the first direction X.

[0107] In some exemplary embodiments of this disclosure, referring to Figures 3 and 4, the support structure 3 may further include a buffer layer 33, which is disposed on the side of the support plate 31 away from the flexible display panel 1, and the buffer layer 33 is located in at least a portion of the bendable region 31ZW. For example, the buffer layer 33 may be located in a portion of the bendable region 31ZW, or the buffer layer 33 may be located in the entire bendable region 31ZW.

[0108] The buffer layer 33 can absorb the step difference in the bendable area 31ZW. Specifically, for foldable display devices, the buffer layer 33 can effectively resist the structural protrusion of the hinge structure 52 of the mid-frame assembly 5. For rollable display devices, the buffer layer 33 can effectively resist the pressure of the rollable support strip 61, so that when the display device is in a bent state, defects such as mold marks on the flexible display panel 1 in the bendable area of ​​the panel are avoided. Moreover, the buffer layer 33 has a certain dustproof function.

[0109] The thickness of the buffer layer 33 is greater than or equal to 0.02 mm and less than or equal to 0.04 mm. For example, the thickness of the buffer layer 33 can be 0.023 mm, 0.025 mm, 0.028 mm, 0.03 mm, 0.032 mm, 0.035 mm, 0.037 mm, etc.

[0110] If the thickness of the buffer layer 33 is too thin, its protective performance will be weak; if the thickness of the buffer layer 33 is too thick, it will hinder the overall slim design of the device and make it prone to interference with the hinge structure 52 or other structures. The above-mentioned numerical range not only ensures the protective performance of the buffer layer 33, but also facilitates the overall slim design of the device, and makes it less likely for the buffer layer 33 to interfere with the hinge structure 52 or other structures.

[0111] The buffer layer 33 can be a Mylar film with a single-sided adhesive layer. Specifically, the material of the Mylar film can be thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, or TPU for short.

[0112] Of course, the buffer layer 33 can also be made of other materials, such as PI (polyimide), silicone, acrylic optical adhesive, etc.

[0113] Alternatively, as shown in FIG7, the buffer layer 33 is provided with a plurality of venting holes 331, through which gas can be discharged to prevent air bubbles from being generated in the buffer layer 33 during the bonding process.

[0114] The diameter of the exhaust passage 331 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. For example, the diameter of the exhaust passage 331 can be 0.7 mm, 0.85 mm, 1 mm, 1.2 mm, 1.35 mm, etc.

[0115] If the diameter of the venting through-hole 331 is too small, it will not achieve the desired venting effect and will still easily generate air bubbles; if the diameter of the venting through-hole 331 is too large, it will affect the strength of the buffer layer 33, thereby affecting the protective performance of the buffer layer 33. The above-mentioned numerical range not only ensures effective venting and avoids the generation of air bubbles, but also guarantees the protective performance of the buffer layer 33.

[0116] When the buffer layer 33 overlaps with the adhesion improvement layer 32, the buffer layer 33 can be located on the side of the adhesion improvement layer 32 that is away from the flexible display panel 1.

[0117] Specifically, referring to Figure 8, when the buffer layer 33 is located within the entire area of ​​the bendable region 31ZW, and the bonding improvement layer 32 is also located within the entire area of ​​the bendable region 31ZW, or when the bonding improvement layer 32 is located within the entire area of ​​the bendable region 31ZW and a portion of the non-bendable region 31FZW, the entire buffer layer 33 is located on the side of the bonding improvement layer 32 that is away from the flexible display panel 1. The bonding improvement layer 32 can ensure the firmness of the bonding of the buffer layer 33 and prevent the buffer layer 33 from falling off.

[0118] Referring to FIG9, when the buffer layer 33 is located in a part of the bendable region 31ZW and the bonding improvement layer 32 is located in the entire bendable region 31ZW, or when the bonding improvement layer 32 is located in the entire bendable region 31ZW and a part of the non-bendable region 31FZW, the buffer layer 33 is entirely located on the side of the bonding improvement layer 32 away from the flexible display panel 1. The bonding improvement layer 32 can ensure the firmness of the bonding of the buffer layer 33 and prevent the buffer layer 33 from falling off.

[0119] Referring to Figure 10, when the adhesion improvement layer 32 is located within a portion of the bendable region 31ZW, and the buffer layer 33 is also located within a portion of the bendable region 31ZW, a portion of the adhesion improvement layer 32 can overlap with a portion of the buffer layer 33, while another portion of the adhesion improvement layer 32 does not overlap with another portion of the buffer layer 33. Within the overlapping area, the buffer layer 33 is located on the side of the adhesion improvement layer 32 facing away from the flexible display panel 1. The adhesion improvement layer 32 ensures the strong adhesion of the buffer layer 33, preventing it from detaching.

[0120] Additionally, as shown in FIG3, when the bonding improvement layer 32 is located in a portion of the bendable region 31ZW and the buffer layer 33 is also located in a portion of the bendable region 31ZW, the bonding improvement layer 32 and the buffer layer 33 may not overlap.

[0121] Alternatively, referring to Figures 3 and 10, when the buffer layer 33 is located within a portion of the bendable region 31ZW, the buffer layer 33 may be located at the center of the bendable region 31ZW in the first direction X. When the adhesive improvement layer 32 is located within a portion of the bendable region 31ZW, the adhesive improvement layer 32 may be located on both sides of the bendable region 31ZW in the first direction X. That is, the adhesive improvement layer 32 may be configured as two spaced-apart portions, which may be symmetrically arranged on both sides of the bendable region 31ZW in the first direction X, with the axis of symmetry being the central axis of the bendable region 31ZW extending along the second direction Y.

[0122] In the second direction Y, a buffer layer 33 is disposed throughout the entire bendable region 31ZW. In the second direction Y, an adhesion improvement layer 32 is also disposed throughout the entire bendable region 31ZW.

[0123] It should be noted that the second direction Y is perpendicular to the bending direction of the bendable region 31ZW, and the second direction Y intersects with the first direction X. For example, the second direction Y can be perpendicular to the first direction X.

[0124] In some exemplary embodiments of this disclosure, referring to FIG11, the support plate 31 may include a first carbon fiber layer 311 and a second carbon fiber layer 312 stacked together, wherein the flexural modulus of the second carbon fiber layer 312 is greater than that of the first carbon fiber layer 311.

[0125] Flexural modulus describes a material's resistance to deformation under bending forces. It is defined by the ratio of bending stress to bending strain. The larger the flexural modulus, the greater the force required for the material to undergo the same bending deformation; in other words, the harder the material and the stronger its resistance to bending.

[0126] The second carbon fiber layer 312 can improve the bending modulus of the support plate 31. For foldable display devices, it can resist the slight protrusions at the hinge structure 52 of the middle frame assembly 5. For roll-up display devices, it can resist the slight protrusions of the roll-up support bar 61, making the bendable area 31ZW of the display device flatter when it is unfolded.

[0127] Specifically, the first carbon fiber layer 311 can be made of T700 carbon fiber filaments. T700 is an important indicator, representing the tensile strength standard of the material; more specifically, carbon fibers reaching the T700 level must have a tensile strength of 4.9 GPa. The second carbon fiber layer 312 can be made of M40 carbon fiber filaments, whose axial tensile strength is generally between 4000-5000 MPa. The letters in the carbon fiber filament designation represent the type of precursor fiber, and the numbers represent the tensile modulus.

[0128] The carbon filaments of the first carbon fiber layer 311 extend in a direction parallel to the second direction Y, and the carbon filaments of the second carbon fiber layer 312 extend in a direction parallel to the first direction X.

[0129] In the bending direction of the bendable region 31ZW, the flexural modulus of the first carbon fiber layer 311 is greater than or equal to 40 GPa and less than or equal to 50 GPa. For example, the flexural modulus of the first carbon fiber layer 311 can be 42 GPa, 45 GPa, 47 GPa, etc. The flexural modulus of the second carbon fiber layer 312 is greater than or equal to 50 GPa and less than or equal to 60 GPa. For example, the flexural modulus of the second carbon fiber layer 312 can be 53 GPa, 55 GPa, 58 GPa, etc.

[0130] Optionally, referring to Figure 12, the support plate 31 may further include a third carbon fiber layer 313. The third carbon fiber layer 313 is disposed on the side of the second carbon fiber layer 312 away from the first carbon fiber layer 311, and the flexural modulus of the second carbon fiber layer 312 is greater than that of the third carbon fiber layer 313. When the plate is bent, the outer fibers are under tension and the inner fibers are under compression. Between tension and compression, there is a fiber layer that neither elongates nor compresses, called the strain-neutral layer. The provision of the third carbon fiber layer 313 ensures that the second carbon fiber layer 312 is essentially located in the strain-neutral layer, thus reducing or even avoiding defects such as cracks in the second carbon fiber layer 312 after repeated bending, thereby ensuring the service life of the support plate 31.

[0131] The carbon filaments of the third carbon fiber layer 313 extend in a direction parallel to the second direction Y.

[0132] Alternatively, the flexural modulus of the first carbon fiber layer 311 can be equal to that of the third carbon fiber layer 313. For example, the material of the third carbon fiber layer 313 can also be T700 carbon fiber filament. With this setting, it can be basically ensured that the second carbon fiber layer 312 is located in the strain neutral layer.

[0133] Of course, in some other exemplary embodiments of this disclosure, the flexural modulus of the first carbon fiber layer 311 may be slightly greater than or slightly less than the flexural modulus of the third carbon fiber layer 313.

[0134] The support plate 31 can also be made of high-strength, high-toughness titanium alloy.

[0135] Based on the same inventive concept, this example embodiment also provides a display device. Referring to Figures 1 and 2, the display device may include a flexible display panel 1, a first adhesive layer 2, and a support structure 3. The support structure 3 is any of the support structures described above, and its specific structure has been described in detail above, therefore, it will not be repeated here. The support structure 3 is disposed on the non-display side of the flexible display panel 1. Specifically, the support structure 3 is disposed on the non-display side of the flexible display panel 1 opposite to the display surface. The first adhesive layer 2 is bonded between the support structure 3 and the flexible display panel 1.

[0136] To achieve better folding, sliding, or rolling performance in the display device, it is necessary to reduce the thickness of some of the stacked film layers. Specifically, the thickness of the first adhesive layer 2 can be reduced. For example, the thickness of the first adhesive layer 2 can be greater than or equal to 10 micrometers and less than or equal to 20 micrometers, such as 12 micrometers, 15 micrometers, 17 micrometers, etc. Moreover, the material of the first adhesive layer 2 is pure adhesive, that is, the material of the first adhesive layer 2 does not include the base layer, and the material of the base layer can be polyimide (PI).

[0137] This configuration allows the bending radius R of the display device to be greater than or equal to 1 mm and less than 2 mm. For example, the bending radius R of the display device can reach 1.2 mm, 1.35 mm, 1.5 mm, 1.7 mm, 1.85 mm, etc., making the bending radius R of the display device reach its lowest level ever.

[0138] Of course, in other exemplary embodiments of this disclosure, the thickness of other film layers of the display device may also be reduced, which will not be described in detail here.

[0139] Referring to Figure 1, when the display device is a foldable display device, the display device may further include a mid-frame assembly 5. The mid-frame assembly 5 may include two mid-frames 51 and a hinge structure 52 connecting the two mid-frames 51. The mid-frame assembly 5 is bonded to the adhesive improvement layer 32 of the support structure 3 and the side of the support plate 31 facing away from the flexible display panel 1 by a second adhesive layer 7. The unfolding or folding of the hinge structure 52 drives the unfolding or folding of the entire display device.

[0140] Referring to Figure 2, when the display device is a sliding display device, the display device may further include a rotating shaft 4, a sliding support plate 62, and multiple sliding support strips 61. A portion of the sliding support strips 61 can be bonded to the side of the support structure 3 opposite to the flexible display panel 1 via the second adhesive layer 7, and a portion of the sliding support strips 61 can be bonded to the side of the support structure 3 opposite to the flexible display panel 1 via the second adhesive layer 7. The rotating shaft 4 is provided with multiple grooves extending along its axial direction, and the sliding support strips 61 are fitted into these grooves. Rotation of the rotating shaft 4 enables the display device to unfold or rewind.

[0141] The flexible display panel 1 can be an OLED (Organic Light-Emitting Diode) display panel, a QLED (Quantum Dot Light-Emitting Diodes) display panel, etc.

[0142] The flexible display panel 1 may include a substrate, a display backplate, a polarizer, an OCA (Optically Clear Adhesive) optical adhesive layer, and a cover plate, which are stacked sequentially.

[0143] The features, structures, or characteristics described above can be combined in any suitable manner in one or more embodiments, and the features discussed in the various embodiments are interchangeable where possible. In the above description, numerous specific details are provided to give a full understanding of embodiments of the invention. However, those skilled in the art will recognize that the technical solutions of the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the invention.

[0144] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A support structure disposed on the non-display side of a flexible display panel, said support structure having a bendable region, wherein, The support structure includes: A support plate, in the bendable area, has multiple perforated holes; An adhesion improvement layer is disposed on the side of the support plate opposite to the flexible display panel. The adhesion improvement layer is located in at least a portion of the bendable area. The surface tension coefficient of the adhesion improvement layer is greater than that of the support plate. The surface tension coefficient of the adhesion improvement layer is greater than or equal to 38 mN / m and less than or equal to 42 mN / m.

2. The support structure according to claim 1, wherein, The adhesive improvement layer is made of ink.

3. The support structure according to claim 2, wherein, The ink has a particle size greater than or equal to 10 micrometers and less than or equal to 15 micrometers.

4. The support structure according to claim 1, wherein, The support structure also has a non-bending region located on at least one side of the bendable region, and the adhesion improvement layer is also located in a portion of the non-bending region near the bendable region.

5. The support structure according to claim 4, wherein, The bendable area includes: The first bendable area has multiple first hollow holes provided on the support plate. At least one second sub-bendable region is provided on the side of the first sub-bendable region near the non-bendable region. In the second sub-bendable region, a plurality of second perforated holes are provided on the support plate, and the density of the first perforated holes is greater than the density of the second perforated holes.

6. The support structure according to claim 5, wherein, The ratio of the opening area of ​​the first perforated hole to the opening area of ​​the second perforated hole is greater than or equal to 1.2 and less than or equal to 2.

7. The support structure according to claim 1, wherein, The support structure also includes: A buffer layer is disposed on the side of the support plate opposite to the flexible display panel and is located in at least a portion of the bendable area.

8. The support structure according to claim 7, wherein, The buffer layer is provided with multiple venting holes.

9. The support structure according to claim 7, wherein, When the buffer layer overlaps with the adhesion improvement layer, the buffer layer is disposed on the side of the adhesion improvement layer that is away from the flexible display panel.

10. The support structure according to claim 1, wherein, The support plate includes a first carbon fiber layer and a second carbon fiber layer stacked together, wherein the flexural modulus of the second carbon fiber layer is greater than that of the first carbon fiber layer.

11. The support structure according to claim 10, wherein, The support plate further includes a third carbon fiber layer, which is disposed on the side of the second carbon fiber layer away from the first carbon fiber layer, and the flexural modulus of the second carbon fiber layer is greater than that of the third carbon fiber layer.

12. The support structure according to claim 11, wherein, The flexural modulus of the first carbon fiber layer is equal to that of the third carbon fiber layer.

13. A display device, wherein, include: Flexible display panel; The support structure is the support structure according to any one of claims 1 to 12, wherein the support structure is disposed on the non-display side of the flexible display panel; The first adhesive layer is bonded between the support structure and the flexible display panel.

14. The display device according to claim 13, wherein, The first adhesive layer is made of pure adhesive.

15. The display device according to claim 14, wherein, The thickness of the first adhesive layer is greater than or equal to 10 micrometers and less than or equal to 20 micrometers.

16. The display device according to claim 13, wherein, The display device is a foldable display device, and the display device further includes: A mid-frame assembly is disposed on the side of the support structure opposite to the adhesive improvement layer and the support plate; The second adhesive layer is bonded between the mid-frame assembly, the adhesive improvement layer, and the side of the support plate facing away from the flexible display panel.

17. The display device according to claim 13, wherein, The bending radius of the flexible display panel is greater than or equal to 1 mm and less than 2 mm.

18. The display device according to claim 17, wherein, The bending radius of the flexible display panel is 1.35mm.

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