A support back plate and display device

Abstract

The application provides a support backboard and a display device, and belongs to the technical field of display, aiming to improve the bending resistance of a display module, the support backboard is used for supporting a flexible display module, and the support backboard comprises a bending area which can be bent along a folding shaft; the support backboard comprises a metal base body and carbon fibers doped in the metal base body; wherein the angle between the extension direction of at least part of the carbon fibers in the metal base body and a first direction is less than or equal to 10°, and the first direction is a direction parallel to the plane where the support backboard is located and perpendicular to the folding shaft.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a supporting backboard and a display device. BACKGROUND

[0002] Flexible display modules are widely used in portable electronic devices due to their self-luminous, high color gamut, high contrast, and thin characteristics. 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 display.

[0003] However, the existing supporting protective layer has weak bending resistance and cannot meet the requirements of repeated folding of the flexible display module. SUMMARY

[0004] The present application provides a supporting backboard and a display device to solve the problem of weak bending resistance of the existing supporting protective layer.

[0005] The first aspect of the embodiments of the present application provides a supporting backboard for supporting a flexible display module, the supporting backboard comprising a bending area that can be bent along a folding axis; the supporting backboard comprises 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 the first direction is less than or equal to 10°, and the first direction is a direction parallel to the plane in which the supporting backboard is located and perpendicular to the folding axis.

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

[0007] In a possible implementation, the mass percentage of the carbon fibers in the supporting backboard 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, the mass percentage of any one of the metal materials in the metal matrix in the metal matrix is greater than or equal to 30%.

[0010] In a possible implementation, the supporting backboard further comprises ceramic powder particles; the mass percentage of the ceramic powder particles in the supporting backboard is less than or equal to 50%.

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

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

[0013] The second aspect of the embodiments of the present application provides a display device, which comprises the support backboard of the first aspect of the embodiments of the present application and a flexible display module, and the support backboard is located on the side of the non-display surface of the flexible display module.

[0014] In a possible implementation, the display device further comprises a second metal layer, which is located between the flexible display module and the support backboard, and the metal material of the second metal layer is any one of stainless steel, beryllium copper and titanium alloy.

[0015] The beneficial effects of the present application are that the embodiments of the present application use the support backboard to support the flexible display module, and by doping the carbon fibers in the metal substrate of the support backboard, the extending direction of the carbon fibers in the metal substrate is made to be perpendicular to the direction of the folding axis as much as possible (to make the included angle between the extending direction of the carbon fibers and the first direction smaller), thereby enhancing the strength of the support backboard in a single direction (perpendicular to the folding axis), and improving the bending resistance.

[0016] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and to be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. 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 support backboard in the embodiments of the present application;

[0019] Figure 2 is a sectional view along the folding axis direction of a support backboard in the embodiments of the present application;

[0020] Figure 3 is a sectional view along the first direction of a support backboard in the embodiments of the present application;

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

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

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

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

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

[0026] Figure 9 is a structural schematic diagram of a display device proposed in Example 4 in an embodiment of the present application;

[0027] BRIEF DESCRIPTION OF DRAWINGS: support back plate 100, flexible display module 200, second metal layer 300, support 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] first support film 401, second support film 402. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, clear and complete, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] The terms "first", "second", and the like 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 can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are generally of a kind, and are not limited to the number of objects, for example, the first object can be one, or at least two. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the objects before and after it.

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

[0033] In view of the above problems, the present application provides a support backboard. By doping carbon fibers in the metal substrate of the support backboard, the extension direction of the carbon fibers in the metal matrix is made as perpendicular as possible to the direction of the folding axis (the angle between the extension direction of the carbon fibers and the first direction is small), thereby enhancing the strength of the support backboard in a single direction (perpendicular to the folding axis) and improving the bending resistance.

[0034] The first aspect of the present application provides a support backboard for supporting a flexible display module. The support backboard includes a bending area that can be bent along a folding axis. The support backboard includes a metal matrix and carbon fibers doped in the metal matrix. At least part of the carbon fibers in the metal matrix have an extension direction that forms an angle of less than or equal to 10° with a first direction, which is parallel to the plane of the support backboard and perpendicular to the folding axis.

[0035] Reference Figure 1 , Figure 1 A structural diagram of a support backboard is shown. As shown in Figure 1 , the extension direction of the dashed line A is the direction of the folding axis, and the extension direction of the dashed line B is the first direction, which is perpendicular to the direction of the folding axis.

[0036] Specifically, the support backboard according to the embodiments of the present application is used to support a flexible display module. The flexible display module refers to a display module with display function that can be bent along a folding axis, which generally includes 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 support backboard 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 the embodiment, the support backboard comprises a bending region which can be bent along the folding axis. Since the flexible display module can be bent along the folding axis, in order to make the display device combined with the support backboard still have the function of being bendable, the support backboard also needs to have a certain flexibility and can be bent along the folding axis. For a whole support backboard, at least a part of the region (i.e. the bending region) can be bent along the folding axis and deformed. In other words, the bending region of the support backboard can refer to the region which causes the support backboard to bend and deform when the flexible display module is folded along the direction of the folding axis.

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

[0039] The embodiment of the present application uses the support backboard to support the flexible display module, and by doping carbon fibers in the metal substrate of the support backboard, the carbon fibers are arranged in a direction, i.e. the extension direction of the carbon fibers in the metal matrix is as much as possible perpendicular to the direction of the folding axis (the angle between the extension direction of the carbon fibers and the first direction is small), thereby enhancing the strength of the support backboard in a single direction (the direction perpendicular to the folding axis) and improving the bending resistance (the ability of the material not to be easily broken when repeatedly folded along the folding axis) of the support backboard.

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

[0041] In addition, the carbon fibers have different diameters and lengths, or different densities, and the carbon fibers have different properties (such as breaking strength and elastic modulus). For example, for carbon fiber 1 having a density (g*cm -1 ) of 2.20, the breaking strength (MPa) is 2000 and the elastic modulus (GPa) is 800; for carbon fiber 2 having a density (g*cm -1 ) of 2.23, the breaking strength (MPa) is 1800 and the elastic modulus (GPa) is 950; and for carbon fiber 3 having a density (g*cm -1 ) of 1.90, the breaking strength (MPa) is 3500 and the elastic modulus (GPa) is 400. The density (g*cm -1 ) of the carbon fibers in the present embodiment can be greater than or equal to 1.90 and less than or equal to 2.23.

[0042] In one possible implementation, the mass ratio of the carbon fibers in the support back plate is greater than or equal to 10% and less than or equal to 70%. For example, the mass of the carbon fiber material accounts for 10%, 30%, 50%, or 70% of the total mass of the support back plate.

[0043] Specifically, the mass ratio of the carbon fibers in the support back plate is different, and the corresponding properties of the support back plate are different. As shown in Table 1 below:

[0044] Table 1

[0045] Sample No. Carbon Fiber Ratio Metal Ratio Density (g*cm -1 ) Tensile (MPa) Yield (MPa) E-Modulus (GPa) Electrical Conductivity (IACS %) thermally conductive system (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 the density, tensile properties, yield, elastic modulus, electrical conductivity, and thermal conductivity of the support back plate at different mass ratios of the carbon fibers. As can be seen from Table 1, as the mass ratio of the carbon fibers increases, the density of the support back plate gradually decreases, the tensile properties and the elastic modulus increase, and the overall tensile strength and impact resistance of the support back plate are improved to a certain extent.

[0047] Referring to Figure 4 , Figure 4 shows a schematic diagram of the arrangement of carbon fibers in a metal matrix, such as Figure 4As shown, the carbon fibers doped in the metal matrix can have different extension directions. Since the process of doping carbon fiber material in the metal matrix is difficult to precisely arrange the carbon fibers in one direction, the embodiment proposes that the angle between the extension direction of at least part of the carbon fibers in the metal matrix and the first direction is less than or equal to 10°, thereby making the extension direction of the carbon fibers as a whole perpendicular to the folding axis as much as possible to increase the strength of the support backboard in a single direction. For example, in the support backboard proposed in the embodiment, among all the carbon fibers doped in the metal matrix, there are more than or equal to a first proportion of carbon fibers, and the angle between the extension direction of this part of the carbon fibers and the first direction is less than or equal to 10°. For example, the first proportion 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 extension direction that is less than or equal to 10° from the first direction.

[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, there are carbon fibers whose extension direction is 10° from the first direction, carbon fibers whose extension direction is 5° from the first direction, and carbon fibers whose extension direction is the same as the first direction (the angle is 0°).

[0049] In a 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 is perpendicular to the folding axis. In the support backboard proposed in the embodiment, among all the carbon fibers doped in the metal matrix, there are more than or equal to a second proportion of carbon fibers, and 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. For example, the second proportion 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 an extension direction that is the same as the first direction. Preferably, the extension direction of all the carbon fibers in the metal matrix is the same as the first direction.

[0050] In the related art, the conventional material used for the support backboard is copper or stainless steel, but based on the design principle of light weight, it is necessary to make the support backboard lighter and thinner. 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 backboard.

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

[0052] Exemplarily, the metal matrix used in the embodiment can be an aluminum metal matrix, or an aluminum-magnesium alloy metal matrix. The embodiment uses the scheme of adding carbon fiber doping to the aluminum / magnesium / lithium-based metal matrix to ensure heat conduction, electrical conductivity, high modulus, and high surface flatness, while significantly reducing the density of the support backboard, and realizing material lightness and thinness.

[0053] In a possible implementation, the mass percentage of any one of the metal materials in the metal matrix in the metal matrix is greater than or equal to 30%. Exemplarily, when the metal matrix used in the embodiment is an aluminum-magnesium alloy metal matrix, 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 percentage of the aluminum element can 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 percentage of the magnesium element can be 55%).

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

[0055] In a possible implementation, the thickness of the support backboard is greater than or equal to 0.08 mm and less than or equal to 0.3 mm. Exemplarily, the thickness of the support backboard can be 0.08 mm, 0.1 mm, or 0.3 mm. The elastic modulus of the support backboard 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 backboard further comprises: ceramic powder particles; the mass percentage of the ceramic powder particles in the support backboard is less than or equal to 50%.

[0057] In the embodiment, carbon fiber and ceramic powder particles are doped in the metal matrix. 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 percentage of the ceramic powder particles in the support backboard is 20%, 10%, or 5%. The particle size of the ceramic powder particles is in the range of 10-20 um. The embodiment adds a certain amount of ceramic powder particles to the metal matrix to enhance the strength and hardness of the support backboard.

[0058] In one possible implementation, the bending area of ​​the support back plate is provided with a plurality of strip-shaped through holes, the extending direction of which is parallel to the folding axis.

[0059] Specifically, such as Figure 1 As shown, multiple strip-shaped through holes are provided in the bending area of ​​the supporting back plate, with the number of strip-shaped through holes being greater than 5. The bending area is the region where the supporting back plate deforms (bends together) due to the flexible display module folding along the folding axis. To facilitate folding in the bending area, multiple strip-shaped through holes are provided, with the extension direction of the strip-shaped through holes parallel to the folding axis. In this embodiment, the specific shape of the strip-shaped through holes is not limited; the strip-shaped through holes can be... Figure 1 The ellipse shown can also be a rectangle.

[0060] Furthermore, in one possible implementation, the surface of the support backplate 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. This metal oxide layer may comprise aluminum oxide. By adding a metal oxide layer to the support backplate, its oxidation resistance is improved.

[0061] In one possible implementation, the support backplate can be prepared according to the following processing technology:

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

[0063] Step 2: The mixture of aluminum metal powder and carbon fiber is subjected to high-speed ball milling.

[0064] Step 3: Cold press the ball-milled product into a blank.

[0065] Step 4: Vacuum sinter the product obtained after cold pressing the ingot.

[0066] Step 5: After sintering, hot-rolled sheets are produced. During this process, hot rolling is carried out in a fixed direction, so that the carbon fibers in the metal matrix can be arranged in a certain direction to achieve the purpose of directional arrangement of carbon fibers.

[0067] Step 6: Cut and drill holes according to the shape of the small pieces. In this process, taking the direction of hot rolling in Step 5 as the first direction, and the direction perpendicular to the hot rolling direction as the folding axis direction of the prepared support back plate, cut the pieces to obtain multiple support back plates of the required size. Determine the bending area of ​​each support back plate, and drill holes in the bending area to obtain strip-shaped through holes. Make sure that the extension direction of the strip-shaped through holes is the same as the folding axis direction, that is, the same as the direction perpendicular 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 backboard, a metal oxide layer is prepared on the surface of the support backboard, and the metal oxide can be aluminum oxide. Specifically, the process flow of preparing the metal oxide layer can be in sequence: chemical degreasing, etching cleaning, chemical oxidation, cleaning, and drying.

[0069] In summary, the embodiment of the present application uses a support backboard to support the flexible display module, and by doping carbon fibers in the metal substrate of the support backboard, the carbon fibers are arranged in a direction, that is, the extension direction of the carbon fibers in the metal substrate is perpendicular to the direction of the folding axis (the angle between the extension direction of the carbon fibers and the first direction is small), thereby enhancing the strength of the support backboard in a single direction (perpendicular to the folding axis), enhancing the tensile strength of the support backboard in the direction perpendicular to the folding axis (the ability of the material not to break when repeatedly folding along the folding axis), and improving the bending resistance.

[0070] The second aspect of the embodiment of the present application also provides a display device, which comprises the support backboard of the first aspect of the present application and a flexible display module, and the support backboard is located on the side of the non-display surface of the flexible display module.

[0071] Reference Figure 5 , Figure 5 A structural schematic diagram of a display device is shown, as shown in Figure 5 The display device comprises a support backboard 100 and a flexible display module 200, and the support backboard 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 comprises a transparent cover plate and a flexible thin film display, and the transparent cover plate is located on the light-emitting side of the flexible thin film display, that is, the side of the display surface.

[0072] In a possible implementation, the display device further comprises a second metal layer, which is located between the flexible display module and the support backboard, 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 can be 0.015 mm, 0.025 mm, or 0.05 mm. In the embodiment, by adding a second metal layer, the supportability 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 thin enough to realize bending.

[0074] In a possible implementation, the display device further includes a support film between the flexible display module and the support back plate, which further supports.

[0075] The following examples are described with respect to the structure of different display devices.

[0076] Example 1,

[0077] Referring to Figure 6 , Figure 6 An example 1 proposed display device structure diagram is shown, as Figure 6 shown, in the display device, the support film 400 is located between the second metal layer 300 and the support back plate 100. The area of the support film is greater than the area of the second metal layer. Specifically, the flexible display module is in the stacking order, in turn, 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. According to the stacking order, the side of the non-display surface of the flexible display module (i.e. the other side of the third adhesive layer 7) is in turn second metal layer 300, fourth adhesive layer 8, support film 400, fifth adhesive layer 9, support back plate 100.

[0078] Example 2,

[0079] Referring to Figure 7 , Figure 7 An example 2 proposed display device structure diagram is shown, as Figure 7 shown, in the display device, the support film 400 is located between the second metal layer 300 and the support back plate 100. The area of the support film is greater than the area of the second metal layer. Specifically, the flexible display module is in the stacking order, in turn, transparent cover plate 1, ink 2, first adhesive layer 3, display function layer 6, third adhesive layer 7. There is no polarizing layer in the flexible display module. According to the stacking order, the side of the non-display surface of the flexible display module (i.e. the other side of the third adhesive layer 7) is in turn second metal layer 300, fourth adhesive layer 8, support film 400, fifth adhesive layer 9, support back plate 100.

[0080] Example 3,

[0081] Referring to Figure 8 , Figure 8 An example 3 proposed display device structure diagram is shown, as Figure 8As shown, in this 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 backplate 100. The area of ​​the support film is larger than the area of ​​the second metal layer. Specifically, in the flexible display module, according to the stacking order, there are a transparent cover plate 1, an ink 2, a first adhesive layer 3, a polarizing layer 4, a second adhesive layer 5, a display function layer 6, and a third adhesive layer 7. According to this stacking order, on the non-display side of the flexible display module (i.e., the other side of the third adhesive layer 7), there are the first support film 401, a fourth adhesive layer 8, a second metal layer 300, a fifth adhesive layer 9, a second support film 402, a sixth adhesive layer 10, and a support backplate 100.

[0082] Example 4

[0083] Reference Figure 9 , Figure 9 A schematic diagram of the display device structure proposed in Example 4 is shown, as follows. Figure 9 As shown, in this 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 backplate 100. The area of ​​the support film is larger than the area of ​​the second metal layer. Specifically, in the flexible display module, according to the stacking order, there are a transparent cover plate 1, an ink 2, a first adhesive layer 3, a display functional layer 6, and a second adhesive layer 5. According to this stacking order, on the non-display side of the flexible display module (i.e., the other side of the second adhesive layer 5), there are the first support film 401, a third adhesive layer 7, a second metal layer 300, a fourth adhesive layer 8, a second support film 402, a fifth adhesive layer 9, and a support backplate 100.

[0084] In summary, the embodiments of this application enhance the overall impact / compression resistance of the display device by adding a thin metal sheet (i.e., a second metal layer) between the support back plate and the display module.

[0085] In one possible implementation, the support backplate includes a bending region that can be bent along a folding axis; the support backplate includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein the angle between the extension direction of at least a portion of the carbon fibers in the metal matrix and a first direction is less than or equal to 10°, the first direction being a direction parallel to the plane of the support backplate and perpendicular to the folding axis.

[0086] In one possible implementation, the carbon fiber has a diameter greater than or equal to 5 μm and less than or equal to 30 μm, and the carbon fiber has a length less than or equal to 10 mm.

[0087] In a possible implementation, the mass percentage of the carbon fiber in the support backboard 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, the mass percentage of any one of the metal materials in the metal matrix in the metal matrix is greater than or equal to 30%.

[0090] In a possible implementation, the support backboard further includes ceramic powder particles, and the mass percentage of the ceramic powder particles in the support backboard is less than or equal to 50%.

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

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

[0093] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0094] Finally, it should also be noted that, in this document, the relationship 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 that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, product or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, product or equipment including the element.

[0095] The support backboard and display device provided by the present application are described in detail above, the principles and implementation manners of the present application are described by applying specific examples in the present article, the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the present article should not be understood as the limitation of the present application.

[0096] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.

[0097] It is understood that the application is not limited to the precise construction and methods described in the specification above and shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

[0098] As used herein, the term "one embodiment," "an embodiment," or "one or more embodiments,” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0099] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to avoid obscuring the understanding of this description.

[0100] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In the drawing, which is only intended to illustrate the application, in a unit claim listing several means, several of these means can be embodied by one and the same item of hardware. The words "first", "second", "third", etc. do not denote any order. These words are to be understood as names.

[0101] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A support backplate, characterized in that, For supporting a flexible display module, the supporting backplate includes a bending region that can be bent along a folding axis; the supporting backplate includes: a metal matrix, and carbon fibers doped in the metal matrix; wherein, at least a portion of the carbon fibers in the metal matrix have an angle less than or equal to 10° with a first direction, the first direction being parallel to the plane of the supporting backplate and perpendicular to the folding axis; the extension direction of the carbon fibers is achieved by hot rolling; the metal matrix is ​​one or more of aluminum, magnesium, and lithium.

2. The supporting back plate according to claim 1, characterized in that, The carbon fiber has a diameter greater than or equal to 5 μm and less than or equal to 30 μm, and the carbon fiber has a length less than or equal to 10 mm.

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

4. The supporting back plate according to claim 1, characterized in that, The mass percentage of any one of the metal materials in the metal matrix is ​​greater than or equal to 30%.

5. The supporting back plate according to claim 1, characterized in that, The support back plate also includes ceramic powder particles; the ceramic powder particles account for less than or equal to 50% of the mass of the support back plate.

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

7. The support backplate according to any one of claims 1-6, characterized in that, 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.

8. A display device, characterized in that, The display device includes: a support back plate according to any one of claims 1-7, and a flexible display module, wherein the support back plate is located on the non-display side of the flexible display module.

9. The display device according to claim 8, characterized in that, The display device further includes a second metal layer, which is located between the flexible display module and the supporting back plate. The metal material of the second metal layer is any one of stainless steel, beryllium copper, and titanium alloy.

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