Supporting back plate and display device

Abstract

The invention provides a supporting back plate and a display device, belongs to the technical field of display, and aims to improve the bending resistance of a display module, the supporting back plate is used for supporting a flexible display module, and the supporting back plate comprises a bending area which can be bent along a folding shaft; the supporting back plate comprises a metal matrix and carbon fibers doped in the metal matrix, wherein the included angle between the extending direction of at least part of the carbon fibers in the metal matrix and the first direction is smaller than or equal to 10 degrees, and the first direction is parallel to the plane where the supporting back plate is located and perpendicular to the direction of the folding shaft.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a supporting backplane and a display device. Background Art

[0002] Flexible display modules are widely used in portable electronic devices due to their self-luminous, high color gamut, high contrast, and thinness. In order to further improve the mechanical strength and impact resistance of flexible display modules, a supporting protective layer is usually added to the non-luminous surface of the display.

[0003] However, the existing supporting protective layer has a weak bending resistance and cannot meet the usage scenario requirements of repeatedly folding the flexible display module. Summary of the invention

[0004] The present application provides a supporting back plate and a display device, which are used to solve the problem that the existing supporting protective layer has a weak bending resistance.

[0005] A first aspect of an embodiment of the present application provides a support backplane for supporting a flexible display module, wherein the support backplane includes a bending area that can be bent along a folding axis; the support backplane includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein an extension direction of at least part of the carbon fibers in the metal matrix has an angle less than or equal to 10° with a first direction, and the first direction is a direction parallel to the plane where the support backplane is located and perpendicular to the folding axis.

[0006] In a possible implementation manner, the diameter of the carbon fiber is greater than or equal to 5 um and less than or equal to 30 um, and the length of the carbon fiber is less than or equal to 10 mm.

[0007] In a possible implementation manner, the mass proportion of the carbon fiber in the supporting backplane is greater than or equal to 10% and less than or equal to 70%.

[0008] In a possible implementation, the metal matrix is ​​one or more of aluminum, magnesium, and lithium.

[0009] In a possible implementation manner, the mass proportion of any one metal material in the metal matrix is ​​greater than or equal to 30%.

[0010] In a possible implementation, the support back plate further includes: ceramic powder particles; the mass proportion of the ceramic powder particles in the support back plate is less than or equal to 50%.

[0011] In a possible implementation, the bending area of ​​the supporting back plate is provided with a plurality of strip-shaped through holes, and an extension direction of the strip-shaped through holes is parallel to the folding axis.

[0012] In a possible implementation, the thickness of the supporting back plate is greater than or equal to 0.08 mm and less than or equal to 0.3 mm.

[0013] A second aspect of an embodiment of the present application provides a display device, comprising: the supporting backplane described in the first aspect of the embodiment of the present application, and a flexible display module, wherein the supporting backplane is located on the non-display surface side of the flexible display module.

[0014] In a possible implementation, the display device further includes: a second metal layer, the second metal layer is located between the flexible display module and the supporting back plate, and the metal material of the second metal layer is any one of stainless steel, beryllium copper, and titanium alloy.

[0015] The beneficial effect of the present application is that: the embodiment of the present application utilizes a supporting back panel to support the flexible display module, and by doping carbon fibers into the metal substrate of the supporting back panel, the extension direction of the carbon fibers in the metal matrix is ​​made as perpendicular to the direction of the folding axis as possible (making the angle between the extension direction of the carbon fibers and the first direction smaller), thereby enhancing the strength of the supporting back panel in a single direction (the direction perpendicular to the folding axis) and improving the bending resistance.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0018] Figure 1 is a structural schematic diagram of a supporting back plate in an embodiment of the present application;

[0019] Figure 2 is a schematic cross-sectional view of a support back plate along the folding axis direction in an embodiment of the present application;

[0020] Figure 3 is a schematic cross-sectional view of a supporting back plate along a first direction in an embodiment of the present application;

[0021] Figure 4is a schematic diagram of the arrangement of carbon fibers in a metal matrix in an embodiment of the present application;

[0022] Figure 5 is a schematic structural diagram of a display device in an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of the structure of a display device proposed in Example 1 of the embodiments of the present application;

[0024] Figure 7 is a schematic diagram of the structure of a display device proposed in Example 2 of the embodiments of the present application;

[0025] Figure 8 is a schematic diagram of the structure of a display device proposed in Example 3 of the embodiments of the present application;

[0026] Fig. 9 is a schematic diagram of the structure of a display device proposed in Example 4 of the embodiments of the present application;

[0027] Description of the drawings: supporting backplane 100, flexible display module 200, second metal layer 300, supporting film 400;

[0028] Transparent cover plate 1, ink 2, first adhesive layer 3, polarizing layer 4, second adhesive layer 5, display function layer 6, third adhesive layer 7, fourth adhesive layer 8, fifth adhesive layer 9, sixth adhesive layer 10;

[0029] A first supporting film 401 and a second supporting film 402 . DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or at least two. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0032] Flexible display modules, such as flexible organic light-emitting diode (OLED) displays, are widely used in portable electronic devices due to their self-luminescence, high color gamut, high contrast, and thinness. In order to further improve the mechanical strength and impact resistance of the flexible display module, a supporting protective layer is usually added to the non-luminous surface of the flexible display module. The supporting protective layer should have the following functions: uniform heat, anti-static, anti-back impact, and improved flatness. However, the existing supporting protective layer has weak bending resistance and cannot meet the use scenario requirements of repeated folding of the flexible display module.

[0033] In view of the above problems, the present application provides a support backplane, which enhances the strength of the support backplane in a single direction (the direction perpendicular to the folding axis) by doping carbon fibers into the metal substrate of the support backplane so that the extension direction of the carbon fibers in the metal matrix is ​​as perpendicular to the direction of the folding axis as possible (making the angle between the extension direction of the carbon fibers and the first direction smaller), thereby improving the bending resistance.

[0034] In a first aspect, the present application proposes a support backplane for supporting a flexible display module, wherein the support backplane includes a bending area that can be bent along a folding axis; the support backplane includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein an extension direction of at least part of the carbon fibers in the metal matrix has an angle less than or equal to 10° with a first direction, and the first direction is a direction parallel to the plane where the support backplane is located and perpendicular to the folding axis.

[0035] Reference Figure 1 , Figure 1 A schematic diagram of the structure of a supporting back plate is shown. Figure 1 As shown, the extension direction of the dotted line A is the direction of the folding axis, and the extension direction of the dotted line B is the first direction, which is perpendicular to the direction of the folding axis.

[0036] Specifically, the supporting backplane proposed in the embodiment of the present application is used to support the flexible display module. The flexible display module refers to a display module with a display function that can be bent along a folding axis, generally including: a transparent cover plate and a display panel. The transparent cover plate is located on the display side (i.e., the light emitting side) of the display panel. The supporting backplane is located on the non-display side of the display panel, thereby supporting the flexible display module and further improving the mechanical strength and impact resistance of the flexible display module.

[0037] In this embodiment, the support back plate includes a bending area that can be bent along the folding axis. Since the flexible display module can be bent along the folding axis, in order for the display device after the support back plate and the flexible display module are combined to still have the functional characteristics of being bendable, the support back plate also needs to have a certain flexibility and can be bent along the folding axis. For a whole piece of the support back plate, there is at least a partial area (i.e., the bending area) that can be bent and deformed along the folding axis. In other words, the bending area of ​​the support back plate may refer to the area where the support plate is bent and deformed together when the flexible display module is folded along the direction of the folding axis.

[0038] The support backplane proposed in the embodiment of the present application is a support backplane made of a metal composite material obtained by doping carbon fibers in a metal matrix. In order to improve the bending resistance of the support backplane, the carbon fibers are arranged as perpendicular to the folding axis as possible. Figure 2 , Figure 2 A schematic cross-sectional view of a supporting back plate along the folding axis is shown, Figure 2 As shown, since most of the carbon fibers are in the first direction (i.e., perpendicular to the folding axis), in the cross section of the support back plate along the folding axis, the cross-sectional area of ​​the carbon fibers in the metal matrix is ​​small and short. Figure 3 , Figure 3 A cross-sectional schematic diagram of a supporting back plate along a first direction is shown, Figure 3 As shown, since the angle between the extension direction of most of the carbon fibers in the metal matrix and the first direction is relatively small, the cross-sectional area of ​​the carbon fibers in the metal matrix in the cross section of the support back plate along the first direction is relatively long.

[0039] The embodiment of the present application utilizes a supporting back panel to support a flexible display module. By doping carbon fibers into a metal substrate of the supporting back panel, the carbon fibers are arranged in a directional manner, that is, the extension direction of the carbon fibers in the metal matrix is ​​as perpendicular to the direction of the folding axis as possible (so that the angle between the extension direction of the carbon fibers and the first direction is smaller), thereby enhancing the strength of the supporting back panel in a single direction (the direction perpendicular to the folding axis), thereby improving the bending resistance of the supporting back panel (the ability of the material to not break easily when repeatedly folded along the folding axis).

[0040] In a possible implementation, the diameter of the carbon fiber is greater than or equal to 5um and less than or equal to 30um, and the length of the carbon fiber is less than or equal to 10mm. Exemplarily, the diameter of the carbon fiber can be 5um, 15um, 30um, and the length of the carbon fiber can be 1mm, 5mm, 10mm.

[0041] In addition, the diameter and length of the carbon fiber are different, or the density is different, and the properties (such as breaking strength and elastic modulus) of the carbon fiber are different. For example, for density (g*cm -1 ) is 2.20, the breaking strength (MPa) is 2000, the elastic modulus (GPa) is 800; for the density (g*cm -1 ) is 2.23, the breaking strength (MPa) is 1800, the elastic modulus (GPa) is 950; for the density (g*cm -1 ) is 1.90, the breaking strength (MPa) is 3500, and the elastic modulus (GPa) is 400. The density (g*cm -1 ) can be greater than or equal to 1.90 and less than or equal to 2.23.

[0042] In a possible implementation, the mass proportion of the carbon fiber in the support backplane is greater than or equal to 10% and less than or equal to 70%. Exemplarily, the mass of the carbon fiber material accounts for 10%, 30%, 50% or 70% of the total mass of the support backplane.

[0043] Specifically, the mass proportion of carbon fiber in the supporting backplane is different, and the corresponding supporting backplane has different related properties. As shown in the following Table 1:

[0044] Table 1

[0045] Sample No. Carbon fiber ratio Metal ratio <![CDATA[Density (g * cm -1 )]]> Tensile strength (MPa) Yield (MPa) Elastic modulus(GPa) Electrical conductivity (IACS%) <![CDATA[Thermal conductivity (W*m -1 *K -1 )]]> 1 0％ 100％ 2.76 420 295 70 47％ 151 2 10％ 90％ 2.70 451 346 85 40％ 159 3 15％ 85％ 2.68 480 367 91 36％ 175 4 30％ 70％ 2.59 535 393 108 27％ 190 5 40％ 60％ 2.54 580 427 115 20％ 201 6 50％ 50％ 2.48 651 452 135 15％ 210

[0046] Table 1 shows the changes in density, tensile properties, yield strength, elastic modulus, electrical conductivity and thermal conductivity of the support backplane under different carbon fiber mass proportions. It can be seen from Table 1 that as the mass proportion of carbon fiber increases, the density of the support backplane gradually decreases, the tensile properties and elastic modulus increase, and the overall tensile strength and impact resistance of the support backplane are improved to a certain extent.

[0047] Reference Figure 4 , Figure 4 A schematic diagram of the arrangement of carbon fibers in a metal matrix is ​​shown, Figure 4As shown, the carbon fibers doped in the metal matrix can have different extension directions. Since it is difficult to accurately arrange the carbon fibers completely in one direction by doping the carbon fiber material in the metal matrix, this embodiment proposes to make the angle between the extension direction of at least part of the carbon fibers in the metal matrix and the first direction less than or equal to 10°, so that the extension direction of the carbon fibers as a whole is as perpendicular to the folding axis as possible to increase the strength of the support backplane in a single direction. Exemplarily, in the support backplane proposed in this embodiment, among all the carbon fibers doped in the metal matrix, there are carbon fibers with a number greater than or equal to the first ratio, so that the angle between the extension direction of this part of the carbon fibers and the first direction is less than or equal to 10°. Exemplarily, the first ratio can be 90%, 80%, 70% or 60%, etc. For example, among the carbon fibers doped in the metal matrix, more than 70% of the carbon fibers have an angle between the extension direction and the first direction less than or equal to 10°.

[0048] In a possible implementation, the angle between the extension direction of all the carbon fibers in the metal matrix and the first direction is less than or equal to 10°. That is, the angle between the extension direction of some carbon fibers and the first direction is 10°, the angle between the extension direction of some carbon fibers and the first direction is 5°, and the extension direction of some carbon fibers is the same as the first direction (the angle is 0°).

[0049] In one possible implementation, the extension direction of at least part of the carbon fibers in the metal matrix is ​​the same as the first direction, that is, at least part of the carbon fibers in the metal matrix are completely perpendicular to the folding axis. In the support backplane proposed in this embodiment, among all the carbon fibers doped in the metal matrix, there are carbon fibers whose number is greater than or equal to the second ratio, so that the extension direction of this part of the carbon fibers is the same as the first direction, that is, the extension direction of the carbon fibers is perpendicular to the folding axis. Exemplarily, the second ratio can be 90%, 80%, 70% or 60%, etc. For example, among the carbon fibers doped in the metal matrix, more than 60% of the carbon fibers have the same extension direction as the first direction. Preferably, the extension direction of all carbon fibers in the metal matrix is ​​the same as the first direction.

[0050] In the related art, the conventional material of the support backplane is copper or stainless steel, but based on the lightweight design principle, the support backplane needs to be made thinner and lighter. In order to achieve the above purpose, the embodiment of the present application also proposes to improve the material used for the metal matrix in the support backplane.

[0051] In a possible implementation, the metal matrix is ​​one or more of aluminum, magnesium, and lithium.

[0052] Exemplarily, the metal matrix used in this embodiment can be an aluminum metal matrix, or a metal matrix made of an aluminum-magnesium alloy. The embodiment of the present application uses a solution of adding carbon fiber doping to an aluminum / magnesium / lithium-based metal matrix to ensure thermal conductivity, electrical conductivity, high modulus, and high surface flatness, while significantly reducing the density of the supporting backplane to achieve lightweight and thin materials.

[0053] In a possible implementation, the mass proportion of any one metal material in the metal matrix in the metal matrix is ​​greater than or equal to 30%. Exemplarily, the metal matrix used in this embodiment is a metal matrix made of an aluminum-magnesium alloy, in which the mass of the aluminum element is greater than or equal to 30% of the total weight of the metal matrix (for example, the mass proportion of the aluminum element may be 45%), and the mass of the magnesium element is greater than or equal to 30% of the total weight of the metal matrix (for example, the mass proportion of the magnesium element may be 55%).

[0054] Compared with stainless steel (density 7.9g*cm -1 ), titanium alloy (density 4.5g*cm -1 ) scheme, this application uses one or more metal elements of aluminum, magnesium, and lithium as the metal matrix, and dopes carbon fiber, while maintaining a high modulus, high electrical conductivity, and high thermal conductivity, the material density of the supporting backplane is significantly reduced (the density can be reduced to 2.5g*cm -1 ).

[0055] In a possible implementation, the thickness of the support back plate is greater than or equal to 0.08 mm and less than or equal to 0.3 mm. Exemplarily, the thickness of the support back plate may be 0.08 mm, 0.1 mm or 0.3 mm. The elastic modulus of the support back plate should be greater than or equal to 80 GPa, and the tensile strength should be greater than or equal to 400 MPa.

[0056] In a possible implementation, the support back plate further includes: ceramic powder particles; the mass proportion of the ceramic powder particles in the support back plate is less than or equal to 50%.

[0057] In this embodiment, carbon fibers and ceramic powder particles are doped into a metal matrix, and the ceramic powder particles include one or more of silicon carbide particles, aluminum carbide particles, boron carbide particles, boron oxide particles, aluminum boride particles, silicon boride particles, magnesium borate particles, and diamond particles. Exemplarily, the mass proportion of ceramic powder particles in the support backplane is 20%, 10% or 5%. The particle size of the ceramic powder particles is in the range of 10-20um. In the embodiment of the present application, a certain amount of ceramic powder particles is added to the metal matrix to enhance the strength and hardness of the support backplane.

[0058] In a possible implementation, the bending area of ​​the supporting back plate is provided with a plurality of strip-shaped through holes, and an extension direction of the strip-shaped through holes is parallel to the folding axis.

[0059] Specifically, Figure 1 As shown, a plurality of strip-shaped through holes are provided in the bending area of ​​the support back plate, and the number of the strip-shaped through holes is greater than 5. The bending area is provided with an area where the flexible display module is folded along the folding axis to cause the support back plate to deform (bend together). In order to facilitate the folding of the bending area, a plurality of strip-shaped through holes are provided in the bending area, and the extension direction of the strip-shaped through holes is parallel to the folding axis. In this embodiment, the specific shape of the strip-shaped through hole is not limited, and the strip-shaped through hole can be Figure 1 The ellipse shown may also be a rectangle.

[0060] In addition, in a possible implementation, the surface of the support backplane is also covered with a metal oxide layer, and the sidewalls of the strip-shaped through holes in the bending area are also covered with a metal oxide layer. The metal oxide layer may contain aluminum oxide. By adding a metal oxide layer to the support backplane, the anti-oxidation ability of the support backplane is improved.

[0061] In a possible implementation, the support back plate may be prepared according to the following processing technology:

[0062] Step 1: Evenly mix aluminum metal powder and carbon fiber. In this embodiment, aluminum metal powder can be used to prepare the metal matrix, and magnesium metal powder, lithium metal powder, or a mixture of the above three metal powders can also be used.

[0063] Step 2: High-speed ball milling the mixture of aluminum metal powder and carbon fiber.

[0064] Step 3, cold-pressing the ball-milled product into ingots.

[0065] Step 4, vacuum sintering the product obtained after cold pressing the embryonic ingot.

[0066] Step 5, after sintering is completed, hot rolling is performed on the sheet. During this process, hot rolling is performed in a fixed direction so that the carbon fibers in the metal matrix can be arranged in a certain direction as a whole, so as to achieve the purpose of directional arrangement of the carbon fibers.

[0067] Step 6, cutting and punching holes according to the shape of the small pieces. In this process, the direction of hot rolling in step 5 is taken as the first direction, and the direction perpendicular to the hot rolling direction is taken as the folding axis direction of the prepared support back plate, so as to cut and obtain multiple support back plates of the required size, and determine the bending area of ​​each support back plate, and punch holes in the bending area to obtain strip-shaped through holes, so that the extension direction of the strip-shaped through holes is the same as the folding axis direction, that is, the same as the perpendicular direction to the hot rolling direction, to obtain the support back plate.

[0068] Step 7, generating a metal oxide layer on the surface of the sheet. In order to slow down the oxidation of the support backplane, a metal oxide layer is prepared on the surface of the support backplane, and the metal oxide can be aluminum oxide. Specifically, the process flow for preparing the metal oxide layer can be: chemical degreasing, corrosion cleaning, chemical oxidation, cleaning, and drying.

[0069] In summary, the embodiment of the present application utilizes a supporting back panel to support a flexible display module, and carbon fibers are doped into a metal substrate of the supporting back panel to direct the carbon fibers, that is, the extension direction of the carbon fibers in the metal matrix is ​​as perpendicular to the direction of the folding axis as possible (so that the angle between the extension direction of the carbon fibers and the first direction is smaller), thereby enhancing the strength of the supporting back panel in a single direction (perpendicular to the folding axis), enhancing the tensile strength of the supporting back panel in a direction perpendicular to the folding axis (the ability of the material to not break easily when repeatedly folded along the folding axis), and improving the bending resistance.

[0070] A second aspect of an embodiment of the present application further provides a display device, comprising: the supporting backplane described in the first aspect of the present application, and a flexible display module, wherein the supporting backplane is located on the non-display surface side of the flexible display module.

[0071] Reference Figure 5 , Figure 5 A schematic diagram of the structure of a display device is shown. Figure 5 As shown, the display device includes: a supporting backplane 100 and a flexible display module 200, wherein the supporting backplane 100 is located on the side of the non-display surface of the flexible display module 200 to play a supporting role. The flexible display module includes a transparent cover plate and a flexible film display, wherein the transparent cover plate is located on the light-emitting side of the flexible film display, i.e., on the side of the display surface.

[0072] In a possible implementation, the display device further includes: a second metal layer, the second metal layer is located between the flexible display module and the supporting back plate, and the metal material of the second metal layer is any one of stainless steel, beryllium copper, and titanium alloy.

[0073] In a possible implementation, the thickness of the second metal layer is greater than or equal to 0.015 mm and less than or equal to 0.05 mm. The thickness of the second metal layer may be 0.015 mm, 0.025 mm or 0.05 mm. In this embodiment, by adding a second metal layer, the support of the display device is further enhanced. The elastic modulus of the second metal layer is greater than or equal to 110 GPa. By controlling the thickness of the second metal layer, the second metal layer is made thin enough to achieve bending.

[0074] In a possible implementation, the display device further includes: a supporting film, wherein the supporting film is located between the flexible display module and the supporting back plate to further play a supporting role.

[0075] The following examples are used to illustrate the structures of different display devices.

[0076] Example 1:

[0077] Reference Figure 6 , Figure 6 A schematic diagram of the structure of a display device proposed in Example 1 is shown. Figure 6 As shown, in the display device, the support film 400 is located between the second metal layer 300 and the support backplane 100. The area of ​​the support film is greater than the area of ​​the second metal layer. Specifically, the flexible display module is stacked in the order of transparent cover plate 1, ink 2, first adhesive layer 3, polarizing layer 4, second adhesive layer 5, display function layer 6, and third adhesive layer 7. According to the stacking order, one side of the non-display surface of the flexible display module (i.e., the other side of the third adhesive layer 7) is the second metal layer 300, the fourth adhesive layer 8, the support film 400, the fifth adhesive layer 9, and the support backplane 100.

[0078] Example 2:

[0079] Reference Figure 7 , Figure 7 A schematic diagram of the structure of a display device proposed in Example 2 is shown. Figure 7 As shown, in the display device, the support film 400 is located between the second metal layer 300 and the support backplane 100. The area of ​​the support film is greater than the area of ​​the second metal layer. Specifically, in the flexible display module, in the stacking order, there are a transparent cover plate 1, ink 2, a first adhesive layer 3, a display function layer 6, and a third adhesive layer 7. There is no polarizing layer in the flexible display module. According to the stacking order, one side of the non-display surface of the flexible display module (i.e., the other side of the third adhesive layer 7) is the second metal layer 300, the fourth adhesive layer 8, the support film 400, the fifth adhesive layer 9, and the support backplane 100.

[0080] Example 3:

[0081] Reference Figure 8 , Figure 8 A schematic diagram of the structure of a display device proposed in Example 3 is shown. Figure 8As shown, in the display device, the support film is divided into a first support film 401 and a second support film 402, the first support film 401 is located between the flexible display module and the second metal layer 300, and the second support film 402 is located between the second metal layer 300 and the support backplane 100. The area of ​​the support film is greater than the area of ​​the second metal layer. Specifically, in the flexible display module, in accordance with the stacking order, the transparent cover plate 1, the ink 2, the first adhesive layer 3, the polarizing layer 4, the second adhesive layer 5, the display function layer 6, and the third adhesive layer 7 are sequentially provided. According to the stacking order, one side of the non-display surface of the flexible display module (i.e., the other side of the third adhesive layer 7) is sequentially provided with the first support film 401, the fourth adhesive layer 8, the second metal layer 300, the fifth adhesive layer 9, the second support film 402, the sixth adhesive layer 10, and the support backplane 100.

[0082] Example 4:

[0083] Reference Fig. 9 , Fig. 9 A schematic diagram of the structure of a display device proposed in Example 4 is shown. Fig. 9 As shown, in the display device, the support film is divided into a first support film 401 and a second support film 402, the first support film 401 is located between the flexible display module and the second metal layer 300, and the second support film 402 is located between the second metal layer 300 and the support backplane 100. The area of ​​the support film is greater than the area of ​​the second metal layer. Specifically, in the flexible display module, in accordance with the stacking order, the transparent cover plate 1, the ink 2, the first adhesive layer 3, the display function layer 6, and the second adhesive layer 5 are sequentially provided. According to the stacking order, one side of the non-display surface of the flexible display module (i.e., the other side of the second adhesive layer 5) is sequentially provided with the first support film 401, the third adhesive layer 7, the second metal layer 300, the fourth adhesive layer 8, the second support film 402, the fifth adhesive layer 9, and the support backplane 100.

[0084] In summary, the embodiment of the present application can enhance the overall anti-impact / extrusion capability of the display device by adding a thin metal sheet (ie, the second metal layer) between the supporting back plate and the display module.

[0085] In a possible embodiment, the support backplane includes a bending area that can be bent along a folding axis; the support backplane includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein the extension direction of at least part of the carbon fibers in the metal matrix has an angle less than or equal to 10° with a first direction, and the first direction is a direction parallel to the plane where the support backplane is located and perpendicular to the folding axis.

[0086] In a possible implementation manner, the diameter of the carbon fiber is greater than or equal to 5 um and less than or equal to 30 um, and the length of the carbon fiber is less than or equal to 10 mm.

[0087] In a possible implementation manner, the mass proportion of the carbon fiber in the supporting backplane is greater than or equal to 10% and less than or equal to 70%.

[0088] In a possible implementation, the metal matrix is ​​one or more of aluminum, magnesium, and lithium.

[0089] In a possible implementation manner, the mass proportion of any one metal material in the metal matrix is ​​greater than or equal to 30%.

[0090] In a possible implementation, the support back plate further includes: ceramic powder particles; the mass proportion of the ceramic powder particles in the support back plate is less than or equal to 50%.

[0091] In a possible implementation, the bending area of ​​the supporting back plate is provided with a plurality of strip-shaped through holes, and an extension direction of the strip-shaped through holes is parallel to the folding axis.

[0092] In a possible implementation, the thickness of the supporting back plate is greater than or equal to 0.08 mm and less than or equal to 0.3 mm.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] Finally, it should be noted that, in this article, relational terms such as first and second, etc. 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. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0095] The above is a detailed introduction to a support back panel and a display device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0096] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0097] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0098] The term "one embodiment", "embodiment" or "one or more embodiments" herein means that a particular feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. In addition, please note that the examples of the term "in one embodiment" here do not necessarily all refer to the same embodiment.

[0099] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0100] In the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A supporting back plate, characterized in that: Used to support a flexible display module, the supporting back panel includes a bending area that can be bent along a folding axis; the supporting back panel includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein the angle between the extension direction of at least part of the carbon fibers in the metal matrix and a first direction is less than or equal to 10°, and the first direction is a direction parallel to the plane where the supporting back panel is located and perpendicular to the folding axis.

2. The support back plate according to claim 1, characterized in that: The diameter of the carbon fiber is greater than or equal to 5um and less than or equal to 30um, and the length of the carbon fiber is less than or equal to 10mm.

3. The support back plate according to claim 1, characterized in that: The mass proportion of the carbon fiber in the supporting back plate is greater than or equal to 10% and less than or equal to 70%.

4. The support back plate according to claim 1, characterized in that: The metal matrix is ​​one or more of aluminum, magnesium and lithium.

5. The support back plate according to claim 4, characterized in that: The mass proportion of any one metal material in the metal matrix is ​​greater than or equal to 30%.

6. The support back plate according to claim 1, characterized in that: The supporting back plate further comprises: ceramic powder particles; the mass proportion of the ceramic powder particles in the supporting back plate is less than or equal to 50%.

7. The support back plate according to claim 1, characterized in that: The bending area of ​​the supporting back plate is provided with a plurality of strip-shaped through holes, and the extending direction of the strip-shaped through holes is parallel to the folding axis.

8. The support back plate according to any one of claims 1 to 7, characterized in that: The thickness of the supporting back plate is greater than or equal to 0.08 mm and less than or equal to 0.3 mm.

9. A display device, characterized in that: The display device comprises: a supporting back plate according to any one of claims 1 to 8, and a flexible display module, wherein the supporting back plate is located on a non-display surface side of the flexible display module.

10. The display device according to claim 9, characterized in that: The display device further includes: a second metal layer, the second metal layer is located between the flexible display module and the supporting back plate, and the metal material of the second metal layer is any one of stainless steel, beryllium copper, and titanium alloy.

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