Folding display panel and display device

Abstract

The application provides a folding display panel and a display device, and relates to the technical field of display, which aims to improve the problem that the folding display panel is thin and light, but causes obvious printing marks of the display device. The folding display panel comprises a flexible display panel, a bending area is defined, the bending area comprises a main bending part located at the center, and a first transition bending part and a second transition bending part located at both ends of the main bending part; a bending support plate is arranged on the back side of the flexible display panel and can bend along with the bending of the flexible display panel; wherein the bending support plate comprises a main support plate and a secondary support plate, the main support plate is arranged on the back side of the flexible display panel, the secondary support plate is arranged on the side of the main support plate away from the flexible display panel, the secondary support plate is provided with at least one first bending hole and at least one second bending hole, the first bending hole is arranged in position with the first transition bending part, and the second bending hole is arranged in position with the second transition bending part.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a foldable display panel and display device. Background Technology

[0002] Flexible organic light-emitting foldable display panels have been widely used in daily life, for example, in foldable mobile phones.

[0003] In related technologies, foldable display panels for display devices primarily utilize flexible metal support materials, such as SUS and Ti alloys, which provide a certain level of support strength and flexibility. Simultaneously, the metal can be chemically etched to create a groove in the lower half of the transition bending area, while the upper half retains a flat, semi-etched design. Therefore, even after multiple folds, the transition bending area is less prone to developing marks. However, these materials generally have a high density and are relatively heavy, affecting the thinness and lightness of the foldable display panel.

[0004] To address this, some related technologies replace metal support materials with carbon fiber support materials to achieve the goal of reducing the weight and thickness of foldable display panels. However, due to the low strength of carbon fiber support materials and the fact that carbon fiber sheets cannot be chemically etched and can only be processed by laser processing, which can only create through holes and cannot process them into partial cuts, when the support material comes into contact with other rigid surfaces, such as the rigid surface of the mid-frame, the transition bending area is subjected to localized concentrated stress compression. After multiple folds, the foldable display panel will show relatively obvious through-hole imprints. Summary of the Invention

[0005] In view of this, this application provides a foldable display panel and display device to improve the problem that while achieving a thin and light foldable display panel, it also causes obvious through-hole imprints on the foldable display panel.

[0006] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows:

[0007] In a first aspect, embodiments of this application provide a foldable display panel, the foldable display panel comprising:

[0008] A flexible display panel, wherein the flexible display panel defines a bending area, the bending area including a main bending portion located at the center, and a first transition bending portion and a second transition bending portion located at both ends of the main bending portion.

[0009] A bending support plate is provided on the back side of the flexible display panel and can bend along with the flexible display panel.

[0010] The bending support plate includes a main support plate and a secondary support plate. The main support plate is located on the back side of the flexible display panel, and the secondary support plate is located on the side of the main support plate opposite to the flexible display panel. The secondary support plate has at least one first bending hole and at least one second bending hole. The first bending hole is aligned with the first transition bending portion, and the second bending hole is aligned with the second transition bending portion.

[0011] In some embodiments of this application, the sub-support plate includes a first sub-support plate and a second sub-support plate. The first sub-support plate is disposed on the side of the main support plate opposite to the flexible display panel, and the second sub-support plate is disposed on the side of the first sub-support plate opposite to the main support plate. The first bending hole and the second bending hole are both formed in the first sub-support plate and filled with resin.

[0012] In some embodiments of this application, the sub-support plate includes a first sub-support plate and a second sub-support plate. The first sub-support plate is disposed on the side of the main support plate opposite to the flexible display panel, and the second sub-support plate is disposed on the side of the first sub-support plate opposite to the main support plate. Multiple first bending holes and multiple second bending holes are provided and are provided on the second sub-support plate and extend to the first sub-support plate. The multiple first bending holes are arranged at intervals in the area corresponding to the first transition bending portion, and the multiple second bending holes are arranged at intervals in the area corresponding to the second transition bending portion.

[0013] In some embodiments of this application, the sub-support plate includes a first sub-support plate and a second sub-support plate. The first sub-support plate is disposed on the side of the main support plate opposite to the flexible display panel, and the second sub-support plate is disposed on the side of the first sub-support plate opposite to the main support plate. The first sub-support plate has a plurality of first bending holes and a plurality of second bending holes. The plurality of first bending holes are arranged at intervals in the area corresponding to the first transition bending portion, and the plurality of second bending holes are arranged at intervals in the area corresponding to the second transition bending portion.

[0014] In some embodiments of this application, the sub-support plate includes a first sub-support plate and a second sub-support plate. The first sub-support plate is disposed on the side of the main support plate opposite to the flexible display panel, and the second sub-support plate is disposed on the side of the first sub-support plate opposite to the main support plate. The second sub-support plate has a plurality of first bending holes and a plurality of second bending holes. The plurality of first bending holes are arranged at intervals in the area corresponding to the first transition bending portion, and the plurality of second bending holes are arranged at intervals in the area corresponding to the second transition bending portion.

[0015] In some embodiments of this application, the bending radii of the first transition bend and the second transition bend are equal and greater than the bending radius of the main bend.

[0016] In some embodiments of this application, the bending support plate has a plurality of bending through holes, which are aligned with the main bending portion and are spaced apart.

[0017] In some embodiments of this application, the arrangement density of the plurality of first bent holes and the arrangement density of the plurality of second bent holes are both less than the arrangement density of the plurality of bent through holes.

[0018] In some embodiments of this application, the thickness of the main support plate, the first sub-support plate, and the second sub-support plate is not less than 25 μm, and the thickness of the main support plate and the second sub-support plate is less than that of the first sub-support plate.

[0019] Secondly, embodiments of this application provide a display device including a foldable display panel as described in the first aspect.

[0020] In summary, due to the adoption of the above technical solution, this application includes at least the following beneficial effects:

[0021] This application provides a foldable display panel and display device, which mainly utilizes a bending support plate composed of multi-layer composite boards. Bending holes are formed on the secondary support plate, i.e., the support plate not directly mounted on the flexible display panel. These bending holes are isolated from the flexible display panel by the main support plate, effectively preventing the transfer of hole imprints from the bending holes to the flexible display panel. Specifically, the first and second bending holes are formed at positions corresponding to the first and second transition bending portions, and these holes are only formed on the secondary support plate. This separates the bending holes from the flexible display panel by the main support plate, creating a semi-etched structure on the multi-layer composite board. This effectively prevents hole imprints from forming on the flexible display panel after multiple bends of the composite support plate due to pressure from the middle frame floating plate. In addition, by opening bending holes only on the secondary support plate and not on the main support plate, the problem of stress transfer from the holes on the secondary support plate to the flexible display panel can be effectively avoided. Furthermore, the strength of the main support plate can compensate for the insufficient support caused by the bending holes, thus effectively preventing creases. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application and are not intended to limit this application, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a foldable display panel provided in one embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a foldable display panel provided in another embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a foldable display panel provided in another embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a foldable display panel provided in another embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the arrangement of multiple bent through holes provided in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram of the arrangement of multiple first bending holes provided in the embodiments of this application;

[0029] Figure 7 This is a schematic diagram of another arrangement of the plurality of first bending holes provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Main support plate; 2. Secondary support plate; 21. First sub-support plate; 22. Second sub-support plate; 23. First bending hole; 24. Second bending hole; 25. Resin; 3. Bending through hole; 4. Flexible display panel; 41. Main bending section; 42. First transition bending section; 43. Second transition bending section.

[0032] D, aperture width; L, aperture length; Y, first aperture spacing; X, second aperture spacing. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles disclosed in this application.

[0036] Please see Figures 1 to 4 This application provides a foldable display panel, primarily used in bendable display screens, such as those for mobile phones, computers, or tablets, enabling the screen to fold. Furthermore, the foldable display panel provided in this application effectively reduces creases caused by folding. Specifically, the foldable display panel includes:

[0037] The flexible display panel 4 has a bending area, which includes a main bending portion 41 located at the center, and a first transition bending portion 42 and a second transition bending portion 43 located at both ends of the main bending portion.

[0038] A bending support plate is located on the back side of the flexible display panel and can bend along with the flexible display panel.

[0039] The bending support plate includes a main support plate 1 and a secondary support plate 2. The main support plate 1 is located on the back side of the flexible display panel 4, and the secondary support plate 2 is located on the side of the main support plate 1 away from the flexible display panel 4. The secondary support plate 2 has at least one first bending hole 23 and at least one second bending hole 24. The first bending hole 23 is aligned with the first transition bending portion 42, and the second bending hole 24 is aligned with the second transition bending portion 43.

[0040] The technical solution provided in this application mainly utilizes a bending support plate composed of multi-layer composite boards, and bending holes are formed in the sub-support plate 2, i.e., the support plate not directly set on the flexible display panel 4. These bending holes are isolated from the flexible display panel 4 by the main support plate 1, thereby effectively preventing the hole imprints from the bending holes from being transferred to the flexible display panel 4. Specifically, this is mainly achieved by forming a first bending hole 23 and a second bending hole 24 at positions corresponding to the first transition bending portion 42 and the second transition bending portion 43, and by forming the first bending hole 23 and the second bending hole 24 on the sub-support plate 2, which is separated from the flexible display panel 4 by the main support plate 1 and avoids contact with the flexible display panel 4. This effectively prevents the sub-support plate 2 from being squeezed by the middle frame floating plate after multiple subsequent bending, thus preventing the bending hole imprints from being transferred to the flexible display panel 4 and causing imprints. In addition, by opening bending holes only on the secondary support plate 2 and not on the main support plate 1, the problem of stress transfer from the holes in the secondary support plate 2 to the flexible display panel 4 can be effectively avoided. Furthermore, the strength of the main support plate 1 can compensate for the insufficient support caused by the opening of bending holes, effectively preventing the formation of creases.

[0041] The core principle of this application in solving the problem of imprints caused by the contact between the support material and the rigid surface, as mentioned in the background art, is to place the first bending hole 23 and the second bending hole 24 on the secondary support plate 2, instead of on the main support plate 1. Furthermore, the secondary support plate 2 and the main support plate 1 are located on the back side of the flexible display panel 4, with the secondary support plate 2 separated from the flexible display panel 4 by the main support plate 1. This arrangement satisfies both bending and strength requirements while preventing the transfer of hole imprints from the bending holes to the flexible display panel 4. The main support plate 1 and the secondary support plate 2 form a bending support plate, and the first bending hole 23 and the second bending hole 24 are essentially partially formed, preventing the bending holes from penetrating into the flexible display panel 4, thus effectively avoiding the appearance of hole imprints.

[0042] It should be noted that the foldable display panel has both a flat and a folded state. When the foldable display panel is in the flat state, it presents a multi-layered flat panel structure; when the foldable display panel is in the folded state, it presents a teardrop-shaped structure formed by bending multiple flat panels. When the display device is bent, the main bending portion 41 serves as the bending center, with the first transition bending portion 42 and the second transition bending portion 43 located on either side of the main bending portion 41. During the bending or folding process, the first transition bending portion 42 allows the display device to transition smoothly or gradually from the first non-bending portion to the main bending portion 41, and the second transition bending portion 43 allows the display device to transition smoothly or gradually from the second non-bending portion to the main bending portion 41, preventing the display device from breaking or developing creases.

[0043] In some embodiments, the secondary support plate 2 includes a first sub-support plate 21 and a second sub-support plate 22. The main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 are stacked sequentially along the direction opposite to the bending direction. The bending support plate is composed of a three-layer carbon fiber plate structure, which effectively improves the strength of a single layer of carbon fiber plate, thereby preventing fatigue damage to the folding display panel after multiple folds. This significantly increases the number of folds the folding display panel can withstand, improving its durability. Furthermore, carbon fiber material is lightweight and thin, making even with three layers of carbon fiber plates, the folding display panel is still lighter and thinner than those made of SUS material, Ti alloy material, etc., in related technologies.

[0044] It should be noted that the main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 are all made of carbon fiber. Carbon fiber is beneficial for improving flexibility and bendability, and the three-layer carbon fiber laminate structure can also compensate for the insufficient strength of carbon fiber.

[0045] Furthermore, the thickness of the main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 is not less than 25 μm, and there can be various combinations of thicknesses among the main support plate 1, the first sub-support plate 21, and the second sub-support plate 22. For example, the thickness of the main support plate 1 and the second sub-support plate 22 is 25 μm, and the thickness of the first sub-support plate 21 is 120 μm; the thickness of the main support plate 1 and the second sub-support plate 22 is 30 μm, and the thickness of the first sub-support plate 21 is 90 μm; the thickness of the main support plate 1 and the second sub-support plate 22 is 30 μm, and the thickness of the first sub-support plate 21 is 120 μm, etc. The specific thickness combination to be selected depends on the actual situation and is not limited here.

[0046] It should be noted that, regardless of the thickness combination selected, the thickness of the main support plate 1 and the second sub-support plate 22 must be less than the thickness of the first sub-support plate 21.

[0047] In some embodiments, the bending support plate has multiple bending through holes 3. These holes 3 define a specific area aligned with the main bending portion 41. The bending through holes 3 penetrate the main support plate 1 and the secondary support plate 2, ensuring that both the secondary support plate 2 and the main support plate 1 have interconnected bending through holes 3. The multiple bending through holes 3 are spaced apart. By creating bending through holes 3 penetrating the secondary support plate 2 and the main support plate 1, the strength of the folding display panel at the main bending portion 41 can be effectively reduced, facilitating bending and preventing breakage of the main support plate 1 and the secondary support plate 2, as well as creases after multiple folds.

[0048] Please see Figure 1In some embodiments, both the first bending hole 23 and the second bending hole 24 are formed on the first sub-support plate 21. Multiple first bending holes 23 and second bending holes 24 can be provided, or only one can be provided for each. If multiple first bending holes 23 and second bending holes 24 are provided, the aperture width D of the first bending holes 23 and second bending holes 24 is set to be relatively small, and the multiple first bending holes 23 and multiple second bending holes 24 are arranged at intervals. Resin 25 is filled into the multiple first bending holes 23 and multiple second bending holes 24, thereby making the folding display panel easier to bend in the first transition bending portion 42 and the second transition bending portion 43, while effectively avoiding stress concentration and imprints caused by insufficient strength of the carbon fiber plate and contact between the porous structure and the external hard contact surface. If a first bending hole 23 and a second bending hole 24 are provided, the aperture width D of the first bending hole 23 and the second bending hole 24 can be set to be relatively large, so that more resin 25 can be stored in the first bending hole 23 and the second bending hole 24, thereby improving the bendability of the three-layer carbon fiber plate and preventing the bending holes from contacting other rigid contact surfaces at the first bending transition and the second bending transition, thus avoiding stress concentration. In this embodiment, only one first bending hole 23 and one second bending hole 24 are provided. The following is the preparation process of the three-layer carbon fiber plate laminate structure with only one first bending hole 23 and one second bending hole 24 in this embodiment:

[0049] A first sub-support plate 21 is placed on the main support plate 1. Then, laser-cut hollow areas are made on the first sub-support plate 21 at positions corresponding to the first transition bend 42 and the second transition bend 43. These hollow areas are the first bending hole 23 and the second bending hole 24. Resin 25 is then filled into the first bending hole 23 and the second bending hole 24. Next, a second sub-support plate 22 is placed on the side of the first sub-support plate 21 facing away from the main support plate 1, and the three layers of carbon fiber plates are pressed together to ensure a tight fit. Finally, patterned through-hole processing is performed on the three layers of carbon fiber plates, resulting in multiple spaced bending through-holes 3 on each layer. Thus, the foldable display panel with improved imprinting effect is completed. In this embodiment, the thickness of the main support plate 1 and the second sub-support plate 22 is 25 μm, and the thickness of the first sub-support plate 21 is 120 μm.

[0050] Please see Figure 2In another embodiment, the secondary support plate 2 includes a first sub-support plate 21 and a second sub-support plate 22. The main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 are stacked sequentially along the direction opposite to the bending direction. Multiple first bending holes 23 and second bending holes 24 are provided, all located on the second sub-support plate 22 and extending to the first sub-support plate 21. This means that the first bending holes 23 and second bending holes 24 are respectively located on the first sub-support plate 21 and the second sub-support plate 22, and the first bending holes 23 and second bending holes 24 on the first sub-support plate 21 are respectively connected to the first bending holes 23 and second bending holes 24 on the second sub-support plate 22. Multiple first bending holes 23 are arranged at intervals in the area corresponding to the first transition bending portion 42, and multiple second bending holes 24 are arranged at intervals in the area corresponding to the second transition bending portion 43. By respectively opening the first bending hole 23 and the second bending hole 24 on the first sub-support plate 21 and the second sub-support plate 22, the mechanical strength of the first sub-support plate 21 and the second sub-support plate 22 at the transition bending point can be effectively reduced, thereby facilitating the bending of the first sub-support plate 21 and the second sub-support plate 22, increasing the number of folds of the folding display panel, and reducing the probability of creases. Furthermore, by using the main support plate 1 as a support plate to provide support for the first sub-support plate 21 and the second sub-support plate 22 with the first bending hole 23 and the second bending hole 24, it is possible to prevent stress concentration on the structural surface of the second sub-support plate 22 when it comes into contact with other rigid contact surfaces, such as the floating plate, the middle frame, etc., due to insufficient strength, which could lead to marks on the display device. The following is the preparation process of the three-layer carbon fiber plate laminate structure in this embodiment:

[0051] First, the first sub-support plate 21 and the second sub-support plate 22 are pressed together to form the secondary support plate 2. Then, patterned through-hole processing is performed on the secondary support plate 2 at the positions corresponding to the first transition bend 42 and the second transition bend 43 of the main support plate 1, that is, multiple first bend holes 23 and multiple second bend holes 24 are formed. Then, the main support plate 1 is placed on the side of the first sub-support plate 21 away from the second sub-support plate 22 and pressed together to form a three-layer composite board. Finally, patterned through-hole processing is performed on the three-layer composite board, so that multiple spaced-apart bend through-holes 3 are formed at the positions corresponding to the main bend 41. At this point, the folding display panel with improved imprint effect is completed. In this embodiment, the thickness of the main support plate 1 and the second sub-support plate 22 is selected to be 30 μm, and the thickness of the first sub-support plate 21 is selected to be 90 μm.

[0052] Please see Figure 3In another embodiment, the sub-support plate 2 includes a first sub-support plate 21 and a second sub-support plate 22. The main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 are stacked sequentially along the direction opposite to the bending direction. The first sub-support plate 21 has a plurality of first bending holes 23 and a plurality of second bending holes 24. The plurality of first bending holes 23 are spaced apart in the area corresponding to the first transition bending portion 42, and the plurality of second bending holes 24 are spaced apart in the area corresponding to the second transition bending portion 43. By providing a plurality of bending holes on the first sub-support plate 21, i.e., providing a plurality of bending holes in the middle layer, the strength of the sub-support plate 2 at the bending point is reduced, making it easier to bend, effectively reducing the probability of creases and increasing the number of folds the foldable display panel can withstand. Then, bending holes are only provided on the first sub-support plate 21, while no bending holes are provided on the second sub-support plate 22 and the main support plate 1. This allows the second sub-support plate 22 and the main support plate 1 to protect the structure of the first sub-support plate 21 at the bending holes, preventing the structure at the bending holes from making extrusive contact with rigid contact surfaces such as the middle frame. This avoids stress concentration at the bending holes, which could lead to imprints being transferred to the display device. Furthermore, the second sub-support plate 22 and the main support plate 1 also provide strength support for the first sub-support plate 21, preventing imprints from appearing on the first sub-support plate 21 due to insufficient strength.

[0053] The following is the fabrication process of the three-layer carbon fiber plate laminate structure in this embodiment:

[0054] First, patterned through-hole processing is performed on the first sub-support plate 21 to form a first bending hole 23 and a second bending hole 24. The positions of the first bending hole 23 and the second bending hole 24 are respectively aligned with the first transition bending portion 42 and the second transition bending portion 43. Then, the second sub-support plate 22 and the main support plate 1 are respectively placed on both sides of the first sub-support plate 21, and the three-layer carbon fiber plates are pressed together to form a three-layer composite plate. Then, patterned through-hole processing is performed on the area of ​​the three-layer composite plate corresponding to the main bending portion 41 to form a bending through-hole 3 that penetrates the main support plate 1, the first sub-support plate 21, and the second sub-support plate 22. At this point, the folding display panel with improved imprint effect is completed. In this embodiment, the thickness of the main support plate 1 and the second sub-support plate 22 is selected to be 25 μm, and the thickness of the first sub-support plate 21 is selected to be 120 μm.

[0055] Please see Figure 4In another embodiment, the sub-support plate 2 includes a first sub-support plate 21 and a second sub-support plate 22. The main support plate 1, the first sub-support plate 21, and the second sub-support plate 22 are stacked sequentially along the direction opposite to the bending direction. The second sub-support plate 22 has multiple first bending holes 23 and multiple second bending holes 24. The multiple first bending holes 23 are spaced apart in the area corresponding to the first transition bending portion 42, and the multiple second bending holes 24 are spaced apart in the area corresponding to the second transition bending portion 43. By opening the first bending holes 23 and the second bending holes 24 at the transition bending positions of the second sub-support plate 22, the second sub-support plate 22 can be bent more easily, preventing breakage of the folded display panel surface. Furthermore, by using the first sub-support plate 21 and the main support plate 1 as support plates for the second sub-support plate 22, the strength of the second sub-support plate 22 at the openings can be effectively compensated, preventing stress concentration and noticeable marks caused by reduced strength of the second sub-support plate 22 contacting a hard contact surface.

[0056] The following is the fabrication process of the three-layer carbon fiber plate laminate structure in this embodiment:

[0057] First, patterned through-holes are processed on the second sub-support plate 22 to form a first bending hole 23 and a second bending hole 24, which correspond to the positions of the first transition bending portion 42 and the second transition bending portion 43, respectively. Second, a first sub-support plate 21 is provided on one side of the second sub-support plate 22, and a main support plate 1 is provided on the side of the first sub-support plate 21 opposite to the second sub-support plate 22. The three layers are then pressed together to form a three-layer composite plate. Finally, patterned through-holes are processed on the three-layer composite plate to form a bending through-hole 3, which penetrates the main support plate 1, the first sub-support plate 21, and the second sub-support plate 22, and is aligned with the position of the main bending portion 41. Thus, the folding display panel with improved imprinting effect is completed. In this embodiment, the thickness of the main support plate 1 and the second sub-support plate 22 is selected to be 30 μm, and the thickness of the first sub-support plate 21 is selected to be 90 μm.

[0058] It should be noted that in any of the above embodiments, the bending radii of the first transition bend 42 and the second transition bend 43 are equal and greater than the bending radius of the main bend 41. The main function of the first transition bend 42 and the second transition bend 43 is to smoothly transition the main bend 41 and the non-bending portion. The non-bending portion refers to the part of the display device that is not bent and is connected to the main bend 41.

[0059] Please see Figure 5 and Figure 6In some embodiments, the main support plate 1 has a length direction and a width direction, which are defined in the case of the main support plate 1 in a flat state. In the bent state, the length direction and width direction change with the bending direction. The first transition bend 42, the main bend 41, and the second transition bend 43 are arranged sequentially along the length direction. Multiple bending through holes 3 are staggered along the width direction, multiple first bending holes 23 are staggered along the length direction, and multiple second bending holes 24 are staggered along the length direction. By staggering the bending through holes 3 along the width direction, the bending stress borne by the three-layer carbon fiber plate can be reduced, thereby reducing creases. Simultaneously, after the display device undergoes multiple repeated folds, the staggered blocking of the multiple bending through holes 3 can prevent the propagation of cracks in the three-layer carbon fiber plate, thereby preventing the folded display panel from breaking. By staggering the first bending holes 23 along their length, the area occupied by the multiple first bending holes 23 at the corresponding positions of the first transition bending portion 42 can be effectively increased. The multiple first bending holes 23, when aligned along their length, can effectively reduce the tensile modulus of each bending hole, thereby reducing the stress generated by the contact between the contour of the first bending hole 23 and the hard contact surface, and reducing the formation of marks. Similarly, the derivation process and beneficial effects of the second bending hole 24 are the same as those of the first bending hole 23, and will not be repeated here.

[0060] In some embodiments, the bending through-hole 3, the first bending hole 23, and the second bending hole 24 are all oblong holes. The diameter D of the bending through-hole 3 is equal to that of the first bending hole 23 and the second bending hole 24. The length of the bending through-hole 3 along the length direction is greater than the length of the first bending hole 23 along the length direction and greater than the length of the second bending hole 24 along the length direction. During the folding process of the display device, the bending radius is smaller, the bending angle is larger, the degree of bending is greater, and the bending stress or folding stress is greater closer to the main bending part 41. By increasing the length of the bending through-hole 3 in the length direction, the tensile modulus of the bending through-hole 3 is effectively reduced, thereby reducing the bending strength and mechanical strength, providing good bending performance, making it easier to bend, and reducing the occurrence of creases.

[0061] Furthermore, the arrangement density of the multiple first bending holes 23 and the multiple second bending holes 24 are both less than the arrangement density of the multiple bending through holes 3. Specifically, along the length direction, the distance between two adjacent first bending holes 23 and the distance between two adjacent second bending holes 24 are both greater than the distance between two adjacent bending through holes 3; along the width direction, the distance between two adjacent first bending holes 23 and the distance between two adjacent second bending holes 24 are both greater than the distance between two adjacent bending through holes 3. Utilizing the characteristic that a larger distance between adjacent holes results in a larger modulus and correspondingly greater bending stiffness, a smaller distance is set at the bending through holes 3 where the degree of bending is greatest and the bending stress is greatest. This effectively reduces the bending stiffness at the bending through holes 3, making the three-layer carbon fiber plate easier to bend and less prone to breakage and creases. Conversely, at the first transition bend 42 and the second transition bend 43 where the degree of bending is small and the bending stress is small, the distance between adjacent first bending holes 23 and adjacent second bending holes 24 is set to be larger. This can effectively improve the bending stiffness at the first bending holes 23 and the second bending holes 24, and alleviate the problem of marks caused by the second sub-support plate 22 when it is in contact with the rigid contact surface of the middle frame shell or other structures or after long-term bending fatigue.

[0062] Please see Figure 7 In some embodiments, to ensure that the arrangement density of the multiple first bent holes 23 and the multiple second bent holes 24 is less than the arrangement density of the multiple bent through holes 3, besides arranging the multiple first bent holes 23 and the multiple second bent holes 24 in a staggered manner along the length direction, it is also possible to arrange the multiple first bent holes 23 and the multiple second bent holes 24 in a staggered manner along the width direction. If a staggered arrangement along the width direction is used, then the aperture width of the first bent holes 23 and the multiple second bent holes 24 needs to be reduced to achieve the effect of a sparser arrangement of the multiple first bent holes 23 and the multiple second bent holes 24. The specific method used is not limited, but in this embodiment, the former method is preferred because there is a problem with the processing accuracy of bent holes, that is, the size of the bent holes can be reduced to a certain extent. Therefore, in terms of design freedom, the first method, that is, the staggered arrangement along the length direction, has a higher degree of design freedom.

[0063] In this embodiment, the diameter D of the bent through hole 3 is 0.05mm to 1.0mm, the length along the longitudinal direction is defined as the hole length L, which is 1.0mm to 10.00mm, the distance between two adjacent bent through holes 3 in the width direction is defined as the first hole spacing Y, which is 0.08mm to 0.40mm, and the distance between two adjacent bent through holes 3 in the longitudinal direction is defined as the second hole spacing X, which is 0.1mm to 1.5mm. The structural dimensions and spacing of the first bent hole 23 and the second bent hole 24 are the same. Here, only the dimensions and spacing of the first bent hole 23 are described. The diameter D of the first bent hole 23 is 0.03mm to 1.00mm, the hole length L is 0.05mm to 8.00mm, the first hole spacing Y is 0.10mm to 0.50mm, and the second hole spacing X is 0.20mm to 2.00mm.

[0064] Embodiments of this application also provide a display device, which is a foldable flexible display device that can be used in electronic devices with display screens such as mobile phones and computers. The display device includes a foldable display panel as described in any of the above embodiments. Because this display device includes the foldable display panel described in the above embodiments, it also has the structure and beneficial effects of the foldable display panel. The specific structure and the derivation process of the beneficial effects are described in the foregoing embodiments and will not be repeated here.

[0065] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0066] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0067] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0068] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent application are incorporated herein by reference, except for historical application documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

Claims

1. A foldable display panel, characterized in that, The foldable display panel includes: A flexible display panel, wherein the flexible display panel defines a bending area, the bending area including a main bending portion located at the center, and a first transition bending portion and a second transition bending portion located at both ends of the main bending portion. A bending support plate is provided on the back side of the flexible display panel and can bend along with the flexible display panel. The bending support plate includes a main support plate and a secondary support plate. The main support plate is located on the back side of the flexible display panel, and the secondary support plate is located on the side of the main support plate away from the flexible display panel. The secondary support plate has a first bending hole and a second bending hole. The first bending hole is aligned with the first transition bending portion, and the second bending hole is aligned with the second transition bending portion. The bending support plate has multiple bending through holes, which are aligned with the main bending part and penetrate the main support plate and the secondary support plate. The secondary support plate includes a first sub-support plate and a second sub-support plate. The first sub-support plate is located on the side of the main support plate opposite to the flexible display panel, and the second sub-support plate is located on the side of the first sub-support plate opposite to the main support plate. The first sub-support plate has a plurality of first bending holes and a plurality of second bending holes. The plurality of first bending holes are arranged at intervals in the area corresponding to the first transition bending portion, and the plurality of second bending holes are arranged at intervals in the area corresponding to the second transition bending portion. The thickness of both the main support plate and the second sub-support plate is less than that of the first sub-support plate, and no bending holes are provided on the main support plate and the second sub-support plate.

2. The foldable display panel as described in claim 1, characterized in that, The bending radii of the first transition bend and the second transition bend are equal and greater than the bending radius of the main bend.

3. The foldable display panel as described in claim 1 or 2, characterized in that, The multiple bent through holes are spaced apart.

4. The foldable display panel as described in claim 3, characterized in that, The arrangement density of the plurality of first bent holes and the arrangement density of the plurality of second bent holes are both less than the arrangement density of the plurality of bent through holes.

5. The foldable display panel as described in claim 1, characterized in that, The thickness of the main support plate, the first sub-support plate, and the second sub-support plate is not less than 25 μm.

6. A display device, characterized in that, Includes a foldable display panel as described in any one of claims 1 to 5.

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