A support back plate, a preparation method thereof, a display module, and a display device

Abstract

The application provides a supporting backboard and a preparation method thereof, a display module and a display device, and belongs to the technical field of display. The supporting backboard comprises a first supporting layer, a second supporting layer and a third supporting layer which are sequentially stacked. The first supporting layer, the second supporting layer and the third supporting layer are composed of carbon fiber material and resin material. The elongation at break of the resin material is greater than 3%. The supporting backboard and the preparation method thereof, the display module and the display device can improve the bending performance of the supporting backboard.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a support backplate and its preparation method, a display module, and a display device. Background Technology

[0002] Because foldable flexible display modules are typically quite soft, a rigid support plate is usually placed underneath to ensure the flatness of the display module. This support plate is commonly made of metals such as stainless steel or titanium alloy.

[0003] Currently, the support plate in related technologies is prone to breakage and delamination after repeated bending. If the support plate continues to bend, the breakage will become more severe, causing bumps to appear on the front of the screen. Summary of the Invention

[0004] This application provides a support backplate and its manufacturing method, a display module and a display device, with the aim of improving the bending performance of the support backplate.

[0005] The first aspect of this application provides a support backplate, including:

[0006] The first support layer, the second support layer, and the third support layer are stacked in sequence;

[0007] The first support layer, the second support layer, and the third support layer are composed of carbon fiber material and resin material composite;

[0008] The elongation at break of the resin material is greater than 3%.

[0009] Optionally, the yarn spreading uniformity of the first support layer and the third support layer is less than 8;

[0010] The yarn spreading uniformity of the second support layer is less than 3.5.

[0011] Optionally, the basis weight of the carbon fiber material in the first support layer and the third support layer is greater than or equal to 20 g / m². 2 And less than or equal to 30g / m 2 ;

[0012] The basis weight of the carbon fiber material in the second support layer is greater than or equal to 90 g / m². 2 And less than or equal to 110g / m 2 .

[0013] Optionally, the basis weight of the carbon fiber material in the first support layer and the third support layer is 25 g / m². 2 ;

[0014] The basis weight of the carbon fiber material in the second support layer is 110 g / m².2 .

[0015] Optionally, the resin material content in the first support layer and the third support layer is greater than or equal to 42%;

[0016] The resin material content in the second support layer is greater than or equal to 30%.

[0017] Optionally, the support back plate includes a flat area and a bending area that can be bent along the bending axis;

[0018] The first support layer, the second support layer, and the third support layer have multiple through holes arranged in an array in the bending area.

[0019] Optionally, the through hole is configured to be strip-shaped;

[0020] The through holes in the first support layer, the second support layer, and the third support layer are arranged in rows along the first direction and in columns along the second direction, with the through holes in adjacent rows being staggered.

[0021] The first direction is perpendicular to the second direction.

[0022] Optionally, the thickness of the support back plate is greater than or equal to 0.12 mm and less than or equal to 0.15 mm.

[0023] A second aspect of this application provides a display module, including a flexible display panel and a support back plate as provided in the first aspect of this application, wherein the flexible display panel is attached to the support back plate.

[0024] A third aspect of this application provides a display device, including a display module as provided in the second aspect of this application.

[0025] A fourth aspect of this application provides a method for preparing a support backplate, the support backplate comprising a first support layer, a second support layer, and a third support layer stacked sequentially, the preparation method comprising:

[0026] A prepreg yarn spreading process is used to combine resin materials and carbon fiber materials to form the first support layer, the second support layer and the third support layer;

[0027] The first support layer, the second support layer, and the third support layer are cured using a carbon plate molding process;

[0028] The elongation at break of the resin material is greater than 3%.

[0029] Optionally, in the step of curing the first support layer, the second support layer, and the third support layer using a carbon plate molding process, the preparation method includes:

[0030] Before the resin material reaches its softening point temperature, it remains at a first preset temperature for a first target duration.

[0031] The temperature of the carbon plate molding process is gradually increased to a second preset temperature, and the process is held at the second preset temperature for a second target duration, wherein the second preset temperature is greater than the softening point temperature.

[0032] The pressure remains constant during the carbon plate molding process.

[0033] Optionally, the pressure of the carbon plate molding process is greater than or equal to 0.2 MPa and less than or equal to 0.4 MPa.

[0034] Beneficial effects:

[0035] This application provides a support backplate and its preparation method, a display module, and a display device. By setting a first support layer, a second support layer, and a third support layer composed of carbon fiber material and resin material, wherein the elongation at break of the resin material is greater than 3%, and by controlling the uniformity of the yarn spreading of the first, second, and third support layers in the prepreg spreading process, as well as controlling the proportion of resin material in the first, second, and third support layers, the bending capacity of the support backplate can be effectively improved, thereby reducing the phenomenon of breakage and delamination of the support backplate caused by repeated bending and improving the yield of the support backplate. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a planar structure for a supporting backplate according to an embodiment of this application;

[0038] Figure 2 yes Figure 1 Schematic diagram of the structure at section C-C';

[0039] Figure 3 This is a diagram showing the distribution of carbon filaments after the support backplate breaks in related technologies.

[0040] Figure 4This is a diagram showing the distribution of carbon filaments after bending the support backplate, following an embodiment of this application, after adjusting the content of the resin material.

[0041] Figure 5 This is a partial structural diagram of the bending area of ​​a support back plate according to an embodiment of this application;

[0042] Figure 6 This is a flowchart illustrating the steps of a method for preparing a support backplate according to an embodiment of this application.

[0043] Explanation of reference numerals in the attached drawings: 11, First support layer; 12, Second support layer; 13, Third support layer; 14, Through hole; A, Flat area; B, Bending area; X, First direction; Y, Second direction. Detailed Implementation

[0044] 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, 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.

[0045] One related technology involves using carbon fiber as a support component to reduce the weight of the display module. Although carbon fiber has high strength, it is an anisotropic material, meaning its mechanical properties vary significantly in different directions. Therefore, a three-layer layup structure is generally used, with carbon fiber materials at different angles interleaved to ensure sufficient strength and modulus in both directions.

[0046] However, the support plate in the related technology is prone to breakage and delamination after repeated bending.

[0047] In view of this, this application provides a support backplate and its preparation method, a display module, and a display device. By setting a first support layer, a second support layer, and a third support layer composed of carbon fiber material and resin material, wherein the elongation at break of the resin material is greater than 3%, and by controlling the uniformity of the yarn spreading of the first support layer, the second support layer, and the third support layer in the prepreg spreading process, as well as controlling the proportion of resin material in the first support layer, the bending capacity of the support backplate can be effectively improved, thereby reducing the phenomenon of breakage and delamination of the support backplate caused by repeated bending and improving the yield of the support backplate.

[0048] Reference Figure 1 and Figure 2 As shown, this application discloses a support backplate, which includes a first support layer 11, a second support layer 12 and a third support layer 13 stacked sequentially.

[0049] Specifically, refer to Figure 1 As shown, the support backplate is mainly used in flexible display panels. When the flexible display panel requires bending (including single folding, double folding, or triple folding) or rolling, the support backplate also needs to be bendable or rollable. That is, the support backplate has a flat area A and a bending area B that can be bent along the bending axis. There are at least two flat areas A, located on either side of the bending area B; there is at least one bending area B. The bending axis in this text can be understood as the center line of the bending area B or an axis parallel to the center line; it can be an actual axis or a virtual axis.

[0050] Reference Figure 2 As shown, the first support layer 11 and the third support layer 13 are ply structures located on the outer side. When the support back plate is connected to the flexible display panel, the first support layer 11 or the third support layer 13 is in contact with the flexible display panel. The materials of the first support layer 11, the second support layer 12, and the third support layer 13 are all carbon fiber composite materials, that is, the first support layer 11, the second support layer 12, and the third support layer 13 are all composed of carbon fiber materials and resin materials.

[0051] Carbon fiber materials contain fibrous material and are anisotropic, meaning their mechanical properties differ in different directions. For example, the tensile strength of carbon fiber material in the 0° direction (parallel to the extension direction of the carbon fiber) is 2900 MPa-3000 MPa, and the tensile strength in the 90° direction (perpendicular to the extension direction of the carbon fiber) is 70 MPa-80 MPa. For instance, the tensile strength of carbon fiber material in the 0° direction (parallel to the extension direction of the carbon fiber) can be 2900 MPa, 2930 MPa, 2950 MPa, 2980 MPa, or 3000 MPa, and the tensile strength in the 90° direction (perpendicular to the extension direction of the carbon fiber) can be 70 MPa, 73 MPa, 75 MPa, 78 MPa, or 80 MPa.

[0052] In this embodiment, the extending direction of the carbon fiber material in the first support layer 11 and the third support layer 13 is perpendicular to the length direction of the carbon fiber material in the second support layer 12, which can improve the support strength of the support back plate in all directions. For example, the extending direction of the carbon fiber material in the second support layer 12 is perpendicular to the length direction of the bending axis, while the extending direction of the carbon fiber material in the first support layer 11 and the third support layer 13 is parallel to the length direction of the bending axis.

[0053] Resin materials not only act as binders in various support layers, but also play a crucial role in structural strength, fiber protection, and formability. To improve the bending capacity of the support backing plate, this application embodiment proposes new requirements for the tensile strength, modulus, elongation at break, and other mechanical properties of the resin. Specifically, in this application embodiment, the elongation at break of the resin material is greater than 3%. The elongation at break of the resin material is a physical quantity that measures the elongation capacity of the resin material under tensile force until fracture, usually expressed as the ratio of the increase in the distance between gauges at the time of specimen fracture to the initial gauge length. It is understood that when the elongation at break of the resin material is low, the resin material is brittle and easily breaks, while the higher the elongation at break of the resin material, the better the bending performance of the support layer composed of carbon fiber and resin materials.

[0054] In this application, bending tests were conducted on bending back plates with different elongation at break, and the results are shown in Table 1.

[0055] Table 1

[0056]

[0057]

[0058] As shown in Table 1, when the elongation at break of the resin material is greater than 3%, the support back plate prepared by it has better bending performance.

[0059] In the embodiments of this application, the resin material is a thermosetting resin, such as epoxy resin.

[0060] In addition, in this embodiment of the application, the prepreg yarn spreading process in the preparation of the support back plate also requires the yarn spreading uniformity of each support layer.

[0061] The prepreg spreading process is one of the key steps in the production of carbon fiber prepregs. Its purpose is to ensure that the carbon fiber bundles are evenly distributed in the resin matrix, thereby improving the overall performance and product quality of the prepreg.

[0062] Spreading is a crucial process in the production of continuous carbon fiber thermoplastic composite prepregs. Spreading increases the width and reduces the thickness of the carbon fiber bundles, improving resin penetration uniformity and thus enhancing the prepreg's performance. Depending on the spreading tools and mechanisms used, common spreading methods include mechanical spreading, airflow spreading, and ultrasonic spreading.

[0063] The prepreg's yarn spreading effect is strongly correlated with the appearance, mechanical properties, and bending level of each support layer. Uneven yarn spreading can easily lead to dry yarn, material shortages, and poor light and shadow, affecting the carbon fiber plate's appearance and even its mechanical properties. Therefore, in this embodiment, the yarn spreading uniformity (CV) value is used to evaluate the spreading performance.

[0064] Spread uniformity is a crucial parameter in prepreg manufacturing, directly impacting its performance and quality. Spread uniformity refers to the evenness of fiber bundle distribution in both width and thickness directions during the spreading process. It directly affects the distribution of the resin matrix and fiber bundles within the prepreg. Higher spread uniformity allows the resin matrix to penetrate the fiber bundles more evenly, reducing porosity and increasing the prepreg's density and strength. Furthermore, a uniform fiber distribution also contributes to improved fatigue resistance and other properties of the prepreg.

[0065] In this embodiment, the first support layer 11 and the third support layer 13 have a basis weight of 20 g / m³. 2 -30g / m 2 The thin prepreg (i.e., the surface prepreg) and the second support layer 12 use a basis weight of 90g / m². 2 -110g / m 2 The thick prepreg (i.e., the intermediate layer prepreg), that is, after preparation, the basis weight of the carbon fiber material in the first support layer 11 and the third support layer 13 is greater than or equal to 20 g / m². 2 And less than or equal to 30g / m 2 The basis weight of the carbon fiber material in the second support layer 12 is greater than or equal to 90 g / m³. 2 And less than or equal to 110g / m 2 For example, the basis weight of the carbon fiber material in the first support layer 11 and the third support layer 13 can be 20 g / m². 2 23g / m 2 25g / m 2 28g / m 2 30g / m 2 Wait; the basis weight of the carbon fiber material in the second support layer 12 can be 90 g / m². 2 95g / m 2 100g / m 2 105g / m 2 110g / m 2 etc.

[0066] For the first support layer 11 and the third support layer 13, this embodiment requires the yarn spreading uniformity of the surface prepreg to be less than 8; for the second support layer 12, this embodiment requires the yarn spreading uniformity of the intermediate prepreg to be less than 3.5. For example, for the first support layer 11 and the third support layer 13, this embodiment requires the yarn spreading uniformity of the surface prepreg to be 4.5, 5.5, 6.5, 7.5, etc.; for the second support layer 12, this embodiment requires the yarn spreading uniformity of the intermediate prepreg to be 2.9, 3.2, 3.5, etc.

[0067] In addition, refer to Figure 3 As shown, the inventors observed in the experiment that the initial failure location of the support backplate was the outermost layer fracture, followed by delamination between the first and second layers, and continued bending until all three layers broke. By observing the spread of the carbon filaments in the perforated area of ​​the support backplate, it can be seen that the carbon filaments in the first layer of the failed sample were unevenly distributed, and there were pores between the first and second layers.

[0068] By adjusting the ratio of carbon fiber material to resin material and increasing the resin content, the resin material can flow better throughout the carbon fiber. Therefore, in this embodiment, the resin content in the first support layer 11 and the third support layer 13 is greater than or equal to 42%, and the resin content in the second support layer 12 is greater than or equal to 30%. (Refer to...) Figure 4 As shown, after adjusting the content of the resin material, the carbon wires of the support back plate remain partially uniform after bending.

[0069] In this application, relevant experiments were conducted on prepregs with different yarn spreading uniformity and different ratios of carbon fiber material to resin material, and the data are shown in Tables 2 and 3.

[0070] Table 2

[0071]

[0072]

[0073] Table 3

[0074]

[0075] As shown in Tables 2 and 3, both the surface prepreg and the intermediate prepreg can achieve good yarn spreading effect when the resin content and yarn spreading uniformity are properly matched. A good yarn spreading effect will also give the support backing plate better bending ability.

[0076] In one embodiment, the basis weight of the carbon fiber material in the first support layer 11 and the third support layer 13 is 25 g / m². 2The basis weight of the carbon fiber material in the second support layer 12 is 110 g / m². 2 Furthermore, the thickness of the support backplate is greater than or equal to 0.12 mm and less than or equal to 0.15 mm. For example, the thickness of the support backplate can be 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, etc.

[0077] Reference Figure 5 As shown, in one embodiment, the first support layer 11, the second support layer 12, and the third support layer 13 have a plurality of through holes 14 arranged in an array in the bending region B, and the through holes 14 are strip-shaped. The through holes 14 can improve the bending performance of the bending back plate.

[0078] Meanwhile, the through holes of the first support layer 11, the second support layer 12, and the third support layer 13 are arranged in rows along the first direction X and in columns along the second direction Y. The through holes 14 in adjacent rows are staggered, and the length direction of the strip-shaped through holes 14 is parallel to the second direction Y. The first direction X is perpendicular to the bending axis direction of the bending back plate, and the second direction Y is parallel to the bending axis direction of the bending back plate. Therefore, the first direction X is perpendicular to the second direction Y. This design can improve the bending performance of the support back plate.

[0079] Furthermore, when it is necessary to further improve the bending performance of the support back plate, this can be achieved by increasing the proportion of through holes in the bending zone B, for example, by increasing the size of the through holes 14 themselves (including increasing the length or width of the through holes) and reducing the spacing between the through holes 14 in each row and column.

[0080] In one embodiment, the through hole 14 can also be rhomboid or elliptical in shape. Those skilled in the art can configure it according to actual needs.

[0081] Figure 6 A schematic flowchart of a method for fabricating a support backplate is shown. (Refer to...) Figure 6 As shown in the figure, this application embodiment provides a method for preparing a support backplate, the method comprising:

[0082] Step 201: Use the prepreg yarn spreading process to combine resin material and carbon fiber material to form a first support layer 11, a second support layer 12 and a third support layer 13.

[0083] Specifically, the elongation at break of the resin material is greater than 3%.

[0084] The first support layer 11 and the third support layer 13 use materials with a basis weight of 20g / m². 2 -30 g / m 2 The thin prepreg (i.e., the surface prepreg) and the second support layer 12 use a basis weight of 90g / m². 2 -110 g / m2 The thick prepreg (i.e., the intermediate layer prepreg), that is, after preparation, the basis weight of the carbon fiber material in the first support layer 11 and the third support layer 13 is greater than or equal to 20 g / m². 2 And less than or equal to 30g / m 2 The basis weight of the carbon fiber material in the second support layer 12 is greater than or equal to 90 g / m³. 2 And less than or equal to 110g / m 2 .

[0085] For the first support layer 11 and the third support layer 13, the present application embodiment requires the yarn spreading uniformity of the surface prepreg to be less than 8, and for the second support layer 12, the present application embodiment requires the yarn spreading uniformity of the intermediate layer prepreg to be less than 3.5.

[0086] Step 202: Curing the first support layer 11, the second support layer 12 and the third support layer 13 using carbon plate molding process.

[0087] Specifically, carbon fiber plate molding is a process in which carbon fiber prepreg is laminated and compacted, placed into a metal mold, and then formed under high temperature and high pressure. By precisely controlling parameters such as temperature, pressure, and time, carbon fiber prepreg is cured and formed under high temperature and high pressure, thereby producing carbon fiber plates with excellent properties.

[0088] The carbon fiber plate molding process mainly includes the following steps:

[0089] 1. Prepreg Cutting: Based on customer drawings or requirements, the carbon fiber prepreg is cut to the appropriate shape and size. The thickness and number of layers of the prepreg need to be determined according to the performance requirements of the final product.

[0090] 2. Prepreg Layup: The cut carbon fiber prepreg is laid on the mold in a predetermined direction and sequence. During the layup process, it is necessary to ensure that there are no air bubbles or wrinkles between the prepregs, and the interlayer gaps must be strictly controlled to ensure the performance of the final product.

[0091] 3. Pre-compaction: After layup, the prepreg is pre-compacted to reduce interlayer gaps and air content. This step helps improve resin flowability during subsequent high-temperature and high-pressure curing, thereby improving product performance.

[0092] 4. High-Temperature and High-Pressure Curing: The prepreg, which has been laid up and pre-compacted, is placed in a metal mold and then placed in a hot press for high-temperature and high-pressure curing. During the curing process, parameters such as temperature, pressure, and time must be strictly controlled to ensure that the resin is fully cured and forms a good interfacial bond.

[0093] 5. Post-processing: The cured carbon fiber board needs to undergo post-processing, including cutting, drilling, and grinding, to meet the assembly and use requirements of the final product.

[0094] The curing parameters for carbon fiber sheets include curing temperature, curing pressure, and curing time. Curing temperature is one of the key factors affecting the performance of carbon fiber sheets. Temperatures that are too high or too low can lead to incomplete resin curing or defects. Therefore, the appropriate curing temperature must be determined based on the resin's curing characteristics and product requirements. Curing pressure promotes resin flow and removes interlayer air, thereby improving the product's density and performance. The magnitude of the curing pressure needs to be determined based on the thickness and number of layers of the prepreg and must be kept constant during the curing process. The length of the curing time directly affects the degree of resin curing and product performance. Too short a curing time may result in incomplete resin curing, while too long a curing time may increase production costs and reduce production efficiency. Therefore, the appropriate curing time must be determined based on the resin's curing characteristics and product requirements.

[0095] The curing parameters of the carbon fiber plate affect the performance of the final product. Adjustments to these parameters must be made in conjunction with the characteristics of the resin material, such as its softening temperature, viscosity, and gel time.

[0096] To ensure better wetting of the carbon fiber and resin, in this embodiment of the application, for step 202, the preparation method further includes:

[0097] Step 2021: Before the resin material reaches its softening point temperature, it remains at the first preset temperature for a first target duration.

[0098] Specifically, the first preset temperature is a temperature lower than the softening point of the resin material, and the first target duration can be adjusted according to the performance requirements of the final support backing plate. Holding the resin material at the first preset temperature for the first target duration ensures complete resin flow, thereby better dispersing it between the carbon filament layers and increasing the bonding strength between the prepreg layers.

[0099] Furthermore, in this embodiment, multiple first preset temperatures and corresponding first target durations can be set. That is, before the resin material reaches its softening point temperature, the resin material is allowed to remain at different first preset temperatures for different first target durations.

[0100] Step 2022: Gradually increase the temperature of the carbon plate molding process to a second preset temperature, and stay at the second preset temperature for a second target duration. The second preset temperature is greater than the softening point temperature.

[0101] Specifically, after the resin material reaches its softening point temperature, maintaining it at a second preset temperature above the softening point temperature for a second target duration allows the carbon board to cure better and ensures its degree of curing. Furthermore, in this embodiment, multiple second preset temperatures and corresponding second target durations can be set. That is, after the resin material reaches its softening point temperature, the resin material can be maintained at different second preset temperatures for different second target durations.

[0102] It should be noted that, in the embodiments of this application, the curing pressure remains constant during the carbon plate molding process. Furthermore, the curing pressure is greater than or equal to 0.2 MPa and less than or equal to 0.4 MPa.

[0103] Meanwhile, since the curing parameters depend on the properties of the resin material, different process parameters were used in the embodiments of this application to verify the bending results of the support back plate under each process parameter, and the data shown in Table 4 were obtained.

[0104] Table 4

[0105]

[0106]

[0107] As shown in Table 4, the bending results of the support backplate obtained by using process parameters with serial number 3 (softening point temperature of resin material is 100℃) are better. (In Table 4, each temperature corresponds to each time period, and the different pressure values ​​represent that the pressure changes to a certain extent at each stage).

[0108] The support backplate prepared by the above preparation method includes a first support layer 11, a second support layer 12, and a third support layer 13 composed of carbon fiber material and resin material. The elongation at break of the resin material is greater than 3%. By controlling the yarn spreading uniformity of the first support layer 11, the second support layer 12, and the third support layer 13 in the prepreg spreading process, and by controlling the proportion of resin material in the first support layer 11, the second support layer 12, and the third support layer 13, the bending capacity of the support backplate can be effectively improved, thereby reducing the occurrence of breakage and delamination of the support backplate due to repeated bending and improving the yield of the support backplate.

[0109] Based on the same inventive concept, this application also discloses a display module, which includes a flexible display panel and any of the supporting back plates described above in the embodiments of this application.

[0110] Specifically, the flexible display panel is attached to a support backing plate and contacts the first support layer 11 or the third support layer 13 of the support backing plate. The flexible display panel can be an OLED (Organic Electroluminescence Display), a QLED (Quantum Dot Light Emitting Diodes) display panel, or a Micro-LED (Micro Light Emitting Diode Display) display panel.

[0111] In this display module, the support backplate, which is made of resin material with an elongation at break of more than 3% and carbon fiber material, has better bending performance, thus enabling the entire support backplate to have a longer service life and improving the user experience.

[0112] Based on the same inventive concept, embodiments of this application also disclose a display device, which includes a display module as described above in the embodiments of this application.

[0113] Specifically, the display device may include display devices such as liquid crystal displays, electronic paper, and OLED displays, as well as any product or component with display function, such as televisions, digital cameras, mobile phones, watches, tablets, laptops, and navigators, which include these display devices.

[0114] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0115] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0116] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A support backplate, characterized in that, include: The first support layer, the second support layer, and the third support layer are stacked in sequence; The first support layer, the second support layer, and the third support layer are composed of carbon fiber material and resin material composite; Wherein, the elongation at break of the resin material is greater than 3%, and the resin material is a thermosetting resin; The yarn spreading uniformity of the first support layer and the third support layer is less than 8. The yarn spreading uniformity of the second support layer is less than 3.5; The resin material content in the first support layer and the third support layer is greater than or equal to 42%; The resin material content in the second support layer is greater than or equal to 30%.

2. The supporting back plate according to claim 1, characterized in that: The basis weight of the carbon fiber material in the first support layer and the third support layer is greater than or equal to 20 g / m2 and less than or equal to 30 g / m2; The basis weight of the carbon fiber material in the second support layer is greater than or equal to 90 g / m2 and less than or equal to 110 g / m2.

3. The supporting back plate according to claim 2, characterized in that: The basis weight of the carbon fiber material in the first support layer and the third support layer is 25 g / m2; The basis weight of the carbon fiber material in the second support layer is 110 g / m2.

4. The supporting back plate according to claim 1, characterized in that: The support back plate includes a flat area and a bending area that can be bent along the bending axis. The first support layer, the second support layer, and the third support layer have multiple through holes arranged in an array in the bending area.

5. The supporting back plate according to claim 4, characterized in that: The through hole is designed to be strip-shaped; The through holes in the first support layer, the second support layer, and the third support layer are arranged in rows along the first direction and in columns along the second direction, with the through holes in adjacent rows being staggered. The first direction is perpendicular to the second direction.

6. The supporting back plate according to claim 1, characterized in that: The thickness of the support back plate is 0.15 mm.

7. A display module comprising a flexible display panel and a support back plate as described in any one of claims 1-6, wherein the flexible display panel is attached to the support back plate.

8. A display device comprising the display module as described in claim 7.

9. A method for preparing a support backplate, the support backplate comprising a first support layer, a second support layer, and a third support layer stacked sequentially, characterized in that, The preparation method includes: A prepreg yarn spreading process is used to combine resin materials and carbon fiber materials to form the first support layer, the second support layer and the third support layer; The first support layer, the second support layer, and the third support layer are cured using a carbon plate molding process; Wherein, the elongation at break of the resin material is greater than 3%, and the resin material is a thermosetting resin; The yarn spreading uniformity of the first support layer and the third support layer is less than 8. The yarn spreading uniformity of the second support layer is less than 3.5; The resin material content in the first support layer and the third support layer is greater than or equal to 42%; The resin material content in the second support layer is greater than or equal to 30%.

10. The method for preparing the supporting back plate according to claim 9, characterized in that, In the step of curing the first support layer, the second support layer, and the third support layer using a carbon plate molding process, the preparation method includes: Before the resin material reaches its softening point temperature, it remains at a first preset temperature for a first target duration. The temperature of the carbon plate molding process is gradually increased to a second preset temperature, and the process is held at the second preset temperature for a second target duration, wherein the second preset temperature is greater than the softening point temperature. The pressure remains constant during the carbon plate molding process.

11. The method for preparing the supporting backplate according to claim 10, characterized in that: The pressure of the carbon plate molding process is 0.3 MPa.

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