Foldable support plate, flexible screen module and foldable electronic device

Abstract

The application provides a foldable support plate, a flexible screen module and a foldable electronic device. The foldable support plate can be provided with a through groove, and a blind groove can be arranged near the foldable area. The shape of the through groove can be a dumbbell-shaped through groove. The base body of the foldable support plate can be composed of multiple materials. Different materials can correspond to different areas of the foldable support plate. The local plating layer on the foldable support plate can include a nickel sulfamate plating layer and a gold plating layer. An electroplating recess can be arranged in the area corresponding to the local plating layer. The scheme of the application is beneficial to taking into account the lightness, mechanical stability, electromagnetic performance, heat conductivity and the like of the foldable electronic device.

Description

[0001] This application claims priority to Chinese Patent Application No. 202110198143.8, filed on February 22, 2021, entitled "Foldable Support Plate, Flexible Screen Module, Foldable Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic devices, and more specifically, to a foldable support plate, a flexible screen module, and a foldable electronic device. Background Technology

[0003] Users have an increasing demand for electronic devices that are large in size and easy to carry. As a result, electronic devices with foldable flexible displays (i.e., foldable electronic devices) have attracted widespread attention. The flexible display can be unfolded when in use to provide a larger display area; it can also be folded or closed when not in use to reduce the space occupied by foldable electronic devices.

[0004] Users typically fold foldable electronic devices frequently. Therefore, improving the mechanical stability of foldable electronic devices, such as resistance to compression and bending, is necessary. Common methods for improving mechanical stability may introduce other problems, such as increasing the overall weight of the foldable electronic device or affecting its radio frequency performance. Summary of the Invention

[0005] This application provides a foldable support plate, a flexible screen module, and a foldable electronic device, with the aim of improving the overall performance of the foldable support plate, the flexible screen module, and the foldable electronic device.

[0006] In a first aspect, a foldable support plate is provided for attaching a flexible display screen, the foldable support plate comprising:

[0007] The first support portion is in a flat state when the foldable support plate is in a folded state.

[0008] The foldable support part is in a bent state when the foldable support plate is in a folded state, and the foldable support part is provided with multiple through slots;

[0009] A first transition support is connected between the first support and the foldable support. When the foldable support plate is in a folded state, the curvature of the first transition support is smaller than that of the foldable support. The first transition support is provided with multiple groove structures.

[0010] In this application, by providing a first transition support portion on the foldable support plate, it is beneficial for the two support portions of the foldable support plate to fit together relatively tightly, that is, the gap between the two support portions is relatively small. When the user places the foldable electronic device in, for example, a pocket or bag, it is relatively less likely for small parts in the pocket or bag to fall into the gap between the two support portions, which helps to improve the protection of the flexible display screen.

[0011] Furthermore, by incorporating a transition support portion on the foldable support plate, the folding radius R of the foldable support portion can be relatively large. A relatively large folding radius R results in less compression on the inward-folding side of the flexible display screen, reducing the likelihood of wrinkles. It also makes it more difficult for the multi-layered components within the flexible display screen to detach, thus extending the lifespan of the flexible display screen. A relatively large folding radius R also helps reduce the bending stress of the foldable support portion, thereby improving its bending performance and lifespan.

[0012] In addition, the groove structure helps reduce the external force required for the bending transition support and improves the bending performance of the foldable support plate.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the groove structure is a blind groove or a through groove.

[0014] When the foldable support section is in a bent state, the first transition support section can be slightly bent, and the amount of bending can be relatively small. Providing a blind groove at the location with relatively small bending reduces the external force required to bend the first transition support section and helps it to have sufficient support for the flexible display screen. Therefore, it is beneficial to balance the bending performance and compression resistance of the foldable support plate.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the through groove of the foldable support portion includes a first groove and a second groove that are connected, the first groove and the blind groove of the first transition support portion are located on the same side of the foldable support portion, and the depth of the first groove is less than the depth of the second groove.

[0016] In this application, since the etching rate of the blind groove may be faster than that of the through groove, the through groove may not be completely etched when the blind groove is finished. If the depth of the first groove is different from the depth of the second groove, it means that the first etching time of the through groove can be different from the second etching time, which helps to reduce the processing difficulty of the through groove.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the through groove of the foldable support portion includes a first groove, the first groove forming a first port on a first end face of the foldable support portion, and at the first port, the included angle between the groove wall of the first groove and the first end face is an obtuse angle.

[0018] In this application, setting the angle between the groove wall of the first groove and the first end face to be an obtuse angle helps to reduce the force of the through groove port poking into the adhesive layer and filling material around the foldable support plate, thereby helping to extend the service life of the foldable electronic device.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the port shape of the through groove includes a first end opening, a second end opening, and a strip opening, the strip opening being connected between the first end opening and the second end opening, the width of the first end opening and the width of the second end opening being greater than the width of the strip opening, and the ratio of the length of the strip opening to the length of the through groove being greater than a preset ratio.

[0020] In this application, by setting the shape of the through-slot port to a dumbbell shape, it is beneficial to reduce the stress peak generated at the through-slot location. Furthermore, a smaller width of the strip opening helps improve the compressive strength of the foldable support plate in the foldable support section. By reasonably adjusting the shape of the through-slot port, it is beneficial to coordinate the bending performance and compressive strength of the foldable support plate, thereby extending the bending life of the foldable support plate and the foldable electronic device, for example, exceeding 200,000 bending cycles.

[0021] Because the length of the strip opening can be relatively long, the ratio of the length of the solid region to the length of slot A or slot B can be relatively small. This is beneficial for improving the flexibility of the foldable support, reducing the bending stress of the first and second end openings, and thus reducing stress concentration at the first and second end openings. With a fixed ratio of the solid region length to the slot length, if the absolute length of the solid region is small, its support effect on the flexible display is relatively poor, which is detrimental to the compression resistance of the foldable support; conversely, if the absolute length of the solid region is long, its support effect on the flexible display is relatively good, which is beneficial for improving the compression resistance of the foldable support. For example, the ratio of the solid region length to the slot length can be less than 0.1.

[0022] Optionally, the preset ratio can be, for example, 0.7 to 0.9.

[0023] In one example, the width of the strip opening can be approximately 60% to 110% of the thickness of the support plate substrate, such as approximately 70% to 90% of the thickness of the support plate substrate.

[0024] In one example, the width of the strip opening can be approximately 0.1 to 0.15 mm, for example, approximately 0.12 mm.

[0025] In one example, the width of the first end opening can be approximately 0.16 to 2.2 mm, for example, approximately 0.19 to 0.2 mm.

[0026] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate further includes a partial plating layer and a third groove, wherein the partial plating layer and the third groove are disposed opposite to each other on both sides of the foldable support plate.

[0027] In this application, a third groove is machined on the foldable support plate, which helps to balance the internal stress of the support plate substrate, thereby improving the surface flatness of the support plate substrate and the flatness of the flexible display screen.

[0028] In conjunction with the first aspect, in some implementations of the first aspect, the ratio of the groove depth of the third groove to the thickness of the local coating is 0.2 to 0.7.

[0029] In this application, the greater the thickness of the local coating, the greater the depth of the third groove can be.

[0030] In conjunction with the first aspect, in some implementations of the first aspect, the width of the third groove is greater than the width of the local coating.

[0031] In this application, the width of the third groove is greater than the width of the local coating, which can improve the balance of internal stress in the support plate substrate. For example, processing the third groove can remove part of the oxide layer of the foldable support plate, and the residual tensile stress on the foldable support plate can be reduced; in addition, processing the third groove is also beneficial to counteract the protruding deformation caused by the local coating.

[0032] In conjunction with the first aspect, in some implementations of the first aspect, the width of the local coating is less than 2 mm.

[0033] In this application, the larger the size of the local coating, the easier it is for a protrusion to appear on the back of the support plate substrate, and the easier it is for the user to observe the film print on the extinguished flexible display screen.

[0034] In conjunction with the first aspect, in some implementations of the first aspect, the partial plating layer includes a nickel plating layer, a nickel sulfamate plating layer, and a gold plating layer stacked together, wherein the nickel sulfamate plating layer is connected between the nickel plating layer and the gold plating layer.

[0035] In this application, the nickel plating layer can be used to strengthen the bond between the support plate substrate and the nickel sulfamate plating layer. The internal stress of the nickel sulfamate plating layer is generally relatively low, which is beneficial for improving the mechanical stability of the local plating layer. The gold plating layer has good conductivity and wear resistance. Due to the good conductivity of the gold plating layer, the impedance of the local plating layer is relatively low, and the pressure required for the spring to abut against the local plating layer can be relatively small. Therefore, the deformation of the support substrate near the local plating layer is relatively small, which is beneficial for improving the flatness of the flexible display screen. Furthermore, reducing impedance also helps to reduce the RSE value of foldable electronic devices. In addition, due to the good wear resistance of the gold plating layer, minor vibrations between the spring and the gold plating layer are less likely to generate powder, which is beneficial for improving the stability of the local plating layer.

[0036] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate further includes a fourth groove, the fourth groove and the third groove being disposed on both sides of the foldable support plate, and the partial plating being disposed within the fourth groove.

[0037] In this application, processing a fourth groove on the foldable support plate is beneficial for removing part of the oxide layer of the foldable support plate and increasing the bonding force between the local coating and the foldable support plate.

[0038] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate includes a support plate base, the support plate base being used to form the first support portion, the foldable support portion, and the first transition support portion, the support plate base comprising:

[0039] A first substrate portion and a second substrate portion are stacked together, wherein the stiffness of the first substrate portion is greater than that of the second substrate portion, and the thickness of the first substrate portion is greater than that of the second substrate portion.

[0040] In this application, attaching the relatively softer side of the support plate substrate to the flexible display screen is beneficial to improving the flatness of the flexible display screen; attaching the relatively harder side of the support plate substrate to the flexible display screen is beneficial to the compressive strength of the flexible display screen.

[0041] In this application, a first matrix portion with high yield strength and high toughness is used in combination with a second matrix portion with high thermal conductivity or low density through lamination, splicing, overlapping, or embedding composite processes. This can specifically meet the requirements of lightweight, high thermal conductivity, high modulus, low impedance, high bonding strength, and salt spray resistance of the support plate matrix, thereby facilitating the fulfillment of diverse needs for foldable support plates. Furthermore, the support plate matrix provided in this application embodiment helps reduce the weight of the foldable support plate. For example, for foldable electronic devices including an 8-inch flexible display screen, the weight of the foldable support plate can be approximately 12-13g.

[0042] In conjunction with the first aspect, in some implementations of the first aspect, the support plate substrate further includes:

[0043] The third substrate portion is located on both sides of the first substrate portion, and the second substrate portion is located on both sides of the first substrate portion. The stiffness of the first substrate portion is greater than that of the third substrate portion, and the thickness of the first substrate portion is greater than that of the third substrate portion.

[0044] In this application, attaching the relatively softer side of the support plate substrate to the flexible display screen helps improve the flatness of the flexible display screen. Furthermore, the support plate substrate is easier to balance in terms of lightweight design and high thermal conductivity.

[0045] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate includes a support plate base, the support plate base being used to form the first support portion, the foldable support portion, and the first transition support portion, the support plate base comprising:

[0046] A first base portion and a second base portion, the first base portion and the second base portion respectively corresponding to different areas of the foldable support plate, the first base portion being used at least to form the foldable support part, the second base portion being used at least to form the first support part, and the stiffness of the first base portion being greater than the stiffness of the second base portion.

[0047] In this application, for the bendable areas of the foldable support plate, a relatively strong or stiff material is used, which is beneficial for improving the bending performance of the foldable support plate in local areas. For the flat areas of the foldable support plate, a relatively weak or stiff material is used, meaning that in areas where bending is not required, a material with high bending performance can be omitted, which is beneficial for balancing other properties of the foldable support plate (such as portability, heat dissipation, etc.).

[0048] In conjunction with the first aspect, in some implementations of the first aspect, the surface of the first base portion facing the second base portion is a first side surface, the exposed surface of the first base portion includes a first end face, the first side surface is provided with a first protrusion and a first groove, the second base portion includes a second groove matching the first protrusion and a second protrusion matching the first groove, and when the foldable support plate is in the unfolded state, the first side surface is arranged perpendicularly to the first end face.

[0049] In this application, the use of a combination of protrusions and grooves helps to reduce stress concentration at the interface under external forces. A larger contact area between the protrusions and grooves further increases the bonding force at the interface.

[0050] In conjunction with the first aspect, in some implementations of the first aspect, the surface of the first base portion facing the second base portion is a first side surface, the exposed surface of the first base portion is a first end face, and when the foldable support plate is in the unfolded state, the included angle between the first side surface and the first end face is greater than 0° and less than 90°.

[0051] In this application, adjusting the angle between the first side surface and the first end surface helps to increase the bonding force between two adjacent substrate portions. Furthermore, the support plate substrate can be obtained through hot rolling, thus allowing for a relatively high degree of flatness in the interface area between the first substrate portion and the second substrate portion.

[0052] In conjunction with the first aspect, in some implementations of the first aspect, the second substrate portion includes a substrate groove, and the first substrate portion is received within the substrate groove.

[0053] In this application, placing the first substrate portion within the groove of the second substrate portion helps to improve the bonding force between the first and second substrate portions. Furthermore, the foldable support portion of the foldable support plate can accommodate the material properties of both the first and second substrate portions.

[0054] In conjunction with the first aspect, in some implementations of the first aspect, the surface of the first base portion facing the second base portion includes a first side surface and a first end surface, and when the foldable support plate is in the unfolded state, the included angle between the first side surface and the first end surface is greater than 0° and less than 90°.

[0055] In this application, adjusting the angle between the first side surface and the first end surface helps to increase the bonding force between two adjacent substrate portions. Furthermore, the support plate substrate can be obtained through hot rolling, thus allowing for a relatively high degree of flatness in the interface area between the first substrate portion and the second substrate portion.

[0056] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate includes a support plate base, the support plate base being used to form the first support portion, the foldable support portion, and the first transition support portion, the support plate base comprising:

[0057] The first base portion is used to form the first support portion, the foldable support portion, and the first transition support portion. The first base portion also includes a first recessed platform.

[0058] The second base portion is disposed on the first sinking platform, and the second base portion is at least used to form the first support portion.

[0059] In this application, the second base portion is set on the sink of the first base portion, and the flat area of ​​the foldable support plate can take into account the material properties of both the first base portion and the second base portion.

[0060] In conjunction with the first aspect, in some implementations of the first aspect, the surface of the first base portion facing the second base portion includes a first recessed surface and a first side surface, wherein when the foldable support plate is in the unfolded state, the included angle between the first side surface and the first recessed surface is greater than 0° and less than 180°.

[0061] In this application, adjusting the angle between the first side surface and the first recessed surface helps to increase the bonding force between two adjacent substrate portions. Furthermore, the support plate substrate can be obtained through hot rolling, thus allowing for a relatively high degree of flatness in the interface area between the first and second substrate portions.

[0062] In conjunction with the first aspect, in some implementations of the first aspect, the first base portion further includes a second sinking platform, the first sinking platform and the second sinking platform being located at the same end of the first base portion and on opposite sides of the first base portion, the sinking directions of the first sinking platform and the second sinking platform being opposite, and the support plate base further includes:

[0063] The third base portion is disposed on the second sinking platform, and the third base portion is at least used to form the first support portion.

[0064] In this application, attaching the relatively softer side of the support plate substrate to the flexible display screen helps improve the flatness of the flexible display screen. Furthermore, the flat area of ​​the support plate substrate makes it easier to achieve a balance between high strength, lightweight, and high thermal conductivity.

[0065] In conjunction with the first aspect, in certain implementations of the first aspect, the materials of the first matrix portion and the second matrix portion are one or both of the following: titanium and titanium alloys, stainless steel, aluminum alloys, copper alloys, nickel alloys, magnesium alloys, titanium-based amorphous materials, zirconium-based amorphous materials, iron-based amorphous materials, titanium-copper composite materials, titanium-aluminum composite materials, titanium-steel composite materials, nickel-titanium shape memory alloys, steel-copper composite materials, steel-aluminum composite materials, copper-titanium-copper composite materials, titanium-based particle-reinforced alloys, steel-based particle-reinforced alloys, aluminum-based particle-reinforced alloys, copper-based particle-reinforced alloys, nickel-based particle-reinforced alloys, magnesium-based particle-reinforced alloys, titanium-based fiber-reinforced alloys, steel-based fiber-reinforced alloys, aluminum-based fiber-reinforced alloys, copper-based fiber-reinforced alloys, nickel-based fiber-reinforced alloys, and magnesium-based fiber-reinforced alloys.

[0066] In this application, using aluminum alloy on top of titanium alloy helps to further reduce the weight of the foldable support plate. Using copper alloy on top of titanium alloy helps to improve the heat dissipation performance of the foldable support plate and reduce the probability of overheating in flexible displays and other components in foldable electronic devices.

[0067] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate further includes:

[0068] A third transition support portion, which connects the first transition support portion and the foldable support portion, is provided when the foldable support plate is in a folded state.

[0069] The third transition support is in a flat state, or,

[0070] The third transition support is in a bent state, and the curvature of the third transition support is less than that of the first transition support and less than that of the foldable support.

[0071] In this application, the third transition support can act as a transition between the outward (slight) bending state of the first transition support and the inward bending state of the foldable support, which is beneficial to providing sufficient support for the flexible display screen.

[0072] In conjunction with the first aspect, in some implementations of the first aspect, the foldable support plate further includes:

[0073] The second support portion is located on both sides of the first support portion. When the foldable support plate is in a folded state, the second support portion is in a flat state, and the second support portion is arranged parallel to the first support portion.

[0074] In this application, the area of ​​the foldable electronic device that is relatively far from the foldable region can have a relatively thin thickness, laying the foundation for reducing the thickness of the foldable electronic device.

[0075] Secondly, a foldable support plate is provided for covering a flexible display screen, the foldable support plate comprising:

[0076] When the foldable support plate is in a folded state, both the first support part and the second support part are in a flat state.

[0077] A foldable support portion is connected between the first support portion and the second support portion. When the foldable support plate is in a folded state, the foldable support portion is in a bent state.

[0078] The first support portion is provided with a partial plating layer and a third groove, and the partial plating layer and the third groove are disposed opposite to each other on both sides of the foldable support plate.

[0079] In conjunction with the second aspect, in some implementations of the second aspect, the ratio of the groove depth of the third groove to the thickness of the local coating is 0.2 to 0.7.

[0080] In conjunction with the second aspect, in some implementations of the second aspect, the width of the third groove is greater than the width of the local coating.

[0081] In conjunction with the second aspect, in some implementations of the second aspect, the width of the local coating is less than 2 mm.

[0082] In conjunction with the second aspect, in some implementations of the second aspect, the local plating layer includes a nickel plating layer, a nickel sulfamate plating layer, and a gold plating layer stacked together, wherein the nickel sulfamate plating layer is connected between the nickel plating layer and the gold plating layer.

[0083] Thirdly, a foldable support plate is provided for attaching a flexible display screen, the foldable support plate comprising:

[0084] The first support portion is in a flat state when the foldable support plate is in a folded state.

[0085] The foldable support portion is in a bent state when the foldable support plate is in a folded state;

[0086] Multiple through slots are provided in the foldable support portion. Each through slot includes a first groove. The first groove forms a first port on a first end face of the foldable support portion. At the first port, the angle between the groove wall of the first groove and the first end face is an obtuse angle.

[0087] Fourthly, a foldable support plate is provided for attaching a flexible display screen, the foldable support plate comprising:

[0088] The first support portion is in a flat state when the foldable support plate is in a folded state.

[0089] The foldable support portion is in a bent state when the foldable support plate is in a folded state;

[0090] Multiple through slots are provided in the foldable support portion. The port shape of the through slots includes a first end opening, a second end opening, and a strip opening. The strip opening is connected between the first end opening and the second end opening. The width of the first end opening and the width of the second end opening are both greater than the width of the strip opening. The ratio of the length of the strip opening to the length of the through slot is greater than a preset ratio.

[0091] Fifthly, a foldable support plate is provided for attaching a flexible display screen, the foldable support plate comprising:

[0092] A support plate base, wherein the support plate base forms a first support portion and a foldable support portion of the foldable support plate, wherein when the foldable support plate is in a folded state, the first support portion is in a flat state and the foldable support portion is in a bent state; the support plate base includes:

[0093] A first base portion, wherein the first base portion is at least used to form the foldable support portion;

[0094] A second base portion, which is at least used to form the first support portion, has a stiffness less than that of the first base portion.

[0095] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the first base portion and the second base portion are stacked, the first base portion is also used to form the first support portion, the second base portion is also used to form the foldable support portion, and the thickness of the first base portion is greater than the thickness of the second base portion.

[0096] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the support plate substrate further includes:

[0097] The third substrate portion is located on both sides of the first substrate portion, and the second substrate portion is located on both sides of the first substrate portion. The stiffness of the first substrate portion is greater than that of the third substrate portion, and the thickness of the first substrate portion is greater than that of the third substrate portion.

[0098] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the first base portion and the second base portion respectively correspond to different regions of the foldable support plate.

[0099] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the surface of the first base portion facing the second base portion is a first side surface, the exposed surface of the first base portion includes a first end face, the first side surface is provided with a first protrusion and a first groove, the second base portion includes a second groove matching the first protrusion and a second protrusion matching the first groove, and when the foldable support plate is in the unfolded state, the first side surface is arranged perpendicularly to the first end face.

[0100] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the surface of the first base portion facing the second base portion is a first side surface, the exposed surface of the first base portion is a first end face, and when the foldable support plate is in the unfolded state, the included angle between the first side surface and the first end face is greater than 0° and less than 90°.

[0101] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the second substrate portion includes a substrate groove, and the first substrate portion is received within the substrate groove.

[0102] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the surface of the first base portion facing the second base portion includes a first side surface and a first end surface, and when the foldable support plate is in the unfolded state, the included angle between the first side surface and the first end surface is greater than 0° and less than 90°.

[0103] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the first base portion is also used to form the first support portion, the first base portion further includes a first sinking platform, and the second base portion is disposed on the first sinking platform.

[0104] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the surface of the first base portion facing the second base portion includes a first recessed surface and a first side surface, wherein when the foldable support plate is in the unfolded state, the angle between the first side surface and the first recessed surface is greater than 0° and less than 180°.

[0105] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the first base portion further includes a second sinking platform, the first sinking platform and the second sinking platform being located at the same end of the first base portion and on opposite sides of the first base portion, the sinking directions of the first sinking platform and the second sinking platform being opposite, and the support plate base further includes:

[0106] The third base portion is disposed on the second sinking platform, and the third base portion is at least used to form the first support portion.

[0107] In conjunction with the fifth aspect, in certain implementations of the fifth aspect, the materials of the first matrix portion and the second matrix portion are one or both of the following: titanium and titanium alloys, stainless steel, aluminum alloys, copper alloys, nickel alloys, magnesium alloys, titanium-based amorphous materials, zirconium-based amorphous materials, iron-based amorphous materials, titanium-copper composite materials, titanium-aluminum composite materials, titanium-steel composite materials, nickel-titanium shape memory alloys, steel-copper composite materials, steel-aluminum composite materials, copper-titanium-copper composite materials, titanium-based particle-reinforced alloys, steel-based particle-reinforced alloys, aluminum-based particle-reinforced alloys, copper-based particle-reinforced alloys, nickel-based particle-reinforced alloys, magnesium-based particle-reinforced alloys, titanium-based fiber-reinforced alloys, steel-based fiber-reinforced alloys, aluminum-based fiber-reinforced alloys, copper-based fiber-reinforced alloys, nickel-based fiber-reinforced alloys, and magnesium-based fiber-reinforced alloys.

[0108] In a sixth aspect, a flexible screen module is provided, including a flexible display screen and a foldable support plate as described in any of the possible implementations of the first to fifth aspects above, wherein the flexible display screen is attached to the foldable support plate.

[0109] In a seventh aspect, a foldable electronic device is provided, comprising a flexible display screen and a foldable support plate as described in any possible implementation of the first to fifth aspects above, wherein the flexible display screen is attached to the foldable support plate. Attached Figure Description

[0110] Figure 1 This is a schematic structural diagram of a foldable electronic device provided in an embodiment of this application.

[0111] Figure 2 This is a schematic diagram of a foldable electronic device that folds inward.

[0112] Figure 3 This is a schematic diagram of the structure of a foldable electronic device that folds outwards.

[0113] Figure 4 This is an exploded view of a foldable electronic device provided in an embodiment of this application.

[0114] Figure 5 This is a schematic structural diagram of a foldable support plate provided in an embodiment of this application.

[0115] Figure 6 This is a schematic structural diagram of a partial coating provided in an embodiment of this application.

[0116] Figure 7 This is a schematic structural diagram of a through groove provided in an embodiment of this application.

[0117] Figure 8 This is a schematic flowchart illustrating a processing method for a foldable support plate provided in an embodiment of this application.

[0118] Figure 9 This is a schematic diagram of a foldable support plate that folds inward.

[0119] Figure 10 It is a schematic diagram of the foldable support plate folding outwards.

[0120] Figure 11 This is a stress contour plot of the through groove.

[0121] Figure 12 This is an exploded view of another foldable electronic device provided in the embodiments of this application.

[0122] Figure 13 This is a schematic structural diagram of a second support plate provided in an embodiment of this application.

[0123] Figure 14 This is a schematic flowchart illustrating a processing method for a foldable support plate provided in an embodiment of this application.

[0124] Figure 15 This is a schematic diagram of a foldable support plate that folds inward.

[0125] Figure 16 It is a schematic diagram of the foldable support plate folding outwards.

[0126] Figure 17 This is a schematic structural diagram of a foldable electronic device provided in an embodiment of this application.

[0127] Figure 18 This is a schematic structural diagram of a flexible screen module provided in an embodiment of this application.

[0128] Figure 19 This is a schematic structural diagram of a flexible screen module provided in an embodiment of this application.

[0129] Figure 20 This is a schematic structural diagram of a foldable support plate provided in an embodiment of this application.

[0130] Figure 21 These are schematic structural diagrams of various support plate substrates provided in the embodiments of this application.

[0131] Figure 22 This is a schematic structural diagram of a support plate substrate provided in an embodiment of this application.

[0132] Figure 23A This is a schematic structural diagram of a through groove and a blind groove provided in an embodiment of this application.

[0133] Figure 23B This is a schematic structural diagram of a through groove and a blind groove provided in an embodiment of this application.

[0134] Figure 23C This is a schematic structural diagram of a through groove and a blind groove provided in an embodiment of this application.

[0135] Figure 23D This is a schematic structural diagram of a through groove and a blind groove provided in an embodiment of this application.

[0136] Figure 23E This is a schematic structural diagram of a through groove provided in an embodiment of this application.

[0137] Figure 24 This is a schematic structural diagram of a through groove provided in an embodiment of this application.

[0138] Figure 25 This is a stress contour plot of the through groove.

[0139] Figure 26 This is an arrangement diagram of through slots and blind slots provided in an embodiment of this application.

[0140] Figure 27 This is another arrangement diagram of through slots and blind slots provided in the embodiments of this application.

[0141] Figure 28 This is another arrangement diagram of through slots and blind slots provided in the embodiments of this application.

[0142] Figure 29 This is a schematic structural diagram of a partial coating provided in an embodiment of this application.

[0143] Figure 30 This is a schematic diagram of the surface profile of a support plate substrate provided in an embodiment of this application.

[0144] Figure 31 This is a schematic diagram of the surface profile of a support plate substrate provided in an embodiment of this application.

[0145] Figure 32 This is a schematic structural diagram of another flexible screen module provided in the embodiments of this application. Detailed Implementation

[0146] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0147] Figure 1 This is a schematic diagram of the structure of a foldable electronic device 100 provided in an embodiment of this application. The foldable electronic device 100 can be an electronic device with folding function, such as a mobile phone, tablet computer, watch, e-reader, laptop computer, or wearable device. Figure 1 The illustrated embodiment uses a foldable phone as an example.

[0148] refer to Figure 1The foldable electronic device 100 may include a flexible display screen 110, a first side frame 121, a first cover 122, a second side frame 123, a second cover 124, and a hinge mechanism 125. The first side frame 121, the first cover 122, the second side frame 123, and the second cover 124 may form the housing of the flexible display screen 110.

[0149] Figure 1 The pattern filled with an electric array can schematically represent the flexible display screen 110. The flexible display screen 110 can be highly flexible and bendable, providing users with a new interaction method based on its bendability. The display panel of the flexible display screen 110 can be, for example, any one of the following: liquid crystal display (LCD), organic light-emitting diode (OLED), active-matrix organic light-emitting diode (AMOLED), flex light-emitting diode (FLED), quantum dot light-emitting diodes (QLED), etc. This application embodiment does not limit this choice.

[0150] The flexible display screen 110 may include a first display portion 111 corresponding to the first cover 122, a second display portion 112 corresponding to the second cover 124, and a foldable display portion 113 corresponding to the hinge mechanism 125. The foldable display portion 113 may be connected between the first display portion 111 and the second display portion 112.

[0151] The first side frame 121 may surround the outer periphery of the first cover 122 and the outer periphery of the first display portion 111. The first display portion 111 may be arranged parallel to and spaced apart from the first cover 122, and the first display portion 111 and the first cover 122 may be located on opposite sides of the first side frame 121. The space between the first display portion 111 and the first cover 122 may be used to arrange components of the foldable electronic device 100, such as antennas, circuit board assemblies, etc.

[0152] The second side frame 123 can surround the outer periphery of the second cover 124 and the outer periphery of the second display portion 112. The second display portion 112 can be arranged parallel to and spaced apart from the second cover 124, and the second display portion 112 and the second cover 124 can be located on both sides of the second side frame 123. The space between the second display portion 112 and the second cover 124 can be used to arrange components of the foldable electronic device 100, such as antennas, circuit board assemblies, etc.

[0153] In one embodiment provided in this application, the cover and the side frame can be two parts of the housing of the foldable electronic device 100. The cover and the side frame can be connected, and the connection method does not have to be an assembly method such as snap-fit, adhesive, welding, riveting, or clearance fit. The connection relationship between the cover and the side frame is usually difficult to separate. In another embodiment provided in this application, the cover and the side frame can be two different components. By assembling the cover and the side frame together, the housing of the foldable electronic device 100 can be formed.

[0154] A hinge mechanism 125 can be connected between the first cover 122 and the second cover 124. The foldable display portion 113 of the flexible display screen 110 can be fixed to the hinge mechanism 125. Under the action of the hinge mechanism 125, the first cover 122 and the second cover 124 can move closer to or further away from each other. Correspondingly, the first display portion 111 and the second display portion 112 of the flexible display screen 110 can move closer to or further away from each other, so that the flexible display screen 110 can be folded or unfolded.

[0155] In one example, the hinge mechanism 125 may include a main shaft assembly, a first hinge assembly, and a second hinge assembly. The first hinge assembly may be fixed to the first cover 122, and the second hinge assembly may be fixed to the second cover 124. The first and second hinge assemblies are rotatable relative to the main shaft assembly. Through the mutual movement of the first and second hinge assemblies, the mutual movement of the first cover 122 and the second cover 124 can be driven, realizing the opening and closing function of the foldable electronic device 100.

[0156] Figure 1 The foldable electronic device 100 shown is currently in its unfolded state. In the unfolded state, the angle between the first cover 122 and the second cover 124 can be approximately 180°. The flexible display screen 110 can be positioned as follows: Figure 1 The unfolded state shown.

[0157] Figure 2 , Figure 3 Two possible folding states of the foldable electronic device 100 are shown. Figure 2 The foldable electronic device 100 is shown in its inward folded state. Figure 2 The inward folding state shown can be, for example, a left-right inward folding state or a top-bottom inward folding state. Figure 3 The foldable electronic device 100 is shown in its outward folded state. Figure 3 The outward folding state shown can be, for example, a left-right outward folding state or a top-bottom outward folding state. (The following is in conjunction with...) Figures 1 to 3 This paper describes two possible folding states of the foldable electronic device 100.

[0158] In this application, the foldable electronic device 100 being in a folded state can mean that the foldable electronic device 100 is currently bent, and the degree of bending of the foldable electronic device 100 is at its maximum. At this time, the first cover 122 and the second cover 124 can be arranged parallel to each other, spaced apart from each other, and facing each other, and the distance between the first cover 122 and the second cover 124 is the minimum; similarly, the first display unit 111 and the second display unit 112 can be arranged parallel to each other, spaced apart from each other, and facing each other, and the height between the first display unit 111 and the second display unit 112 is the minimum. At this time, the first display unit 111 and the second display unit 112 can be regarded as being located on different planes.

[0159] Combination Figure 1 , Figure 2 When the foldable electronic device 100 is in the inward folded state, the first cover 122 and the second cover 124 are close to each other, and the first display unit 111 and the second display unit 112 can also be close to each other. The first cover 122, the second cover 124, and the hinge mechanism 125 can form a receiving area for accommodating the flexible display screen 110. That is, the flexible display screen 110 can be housed in the space between the first cover 122 and the second cover 124.

[0160] Combination Figure 1 , Figure 3 When the foldable electronic device 100 is in the outward-folded state, the first cover 122 and the second cover 124 can approach each other, and the first display unit 111 and the second display unit 112 can approach each other. The first display unit 111, the second display unit 112, and the foldable display unit 123 can form a housing area for accommodating the first cover 122, the second cover 124, and the hinge mechanism 125. That is, the first cover 122, the second cover 124, and the hinge mechanism 125 can be accommodated in the space between the first display unit 111 and the second display unit 112.

[0161] Figure 4 It shows Figure 1 An exploded view of the foldable electronic device 100 is shown. Figure 4As shown, the foldable electronic device 100 may include a foldable support plate 130. The foldable support plate 130 may be, for example, a thin stainless steel material. The thickness of the foldable support plate 130 may be, for example, 0.15 mm. The foldable support plate 130 can be adhered to the flexible display screen 110, thereby forming a flexible screen module 200 of the foldable electronic device 100. The foldable support plate 130 can be housed within the space between the housing of the foldable electronic device 100 and the flexible display screen 110. The foldable support plate 130 can have a certain strength and rigidity, and its bending performance can be relatively excellent. The foldable support plate 130 can provide support for the flexible display screen 110, which helps ensure the overall flatness of the flexible display screen 110, and thus helps ensure the compression resistance of the foldable electronic device 100. If the support force is insufficient, the flexible display screen 110 may delaminate.

[0162] The foldable support plate 130 may include a first support portion 131, a second support portion 132, and a foldable support portion 133. The first support portion 131 may be correspondingly attached to the first display portion 111 of the flexible display screen 110, and the first support portion 131 may be located between the first display portion 111 and the first cover 122. The second support portion 132 may be correspondingly attached to the second display portion 112 of the flexible display screen 110, and the second support portion 132 may be located between the second display portion 112 and the second cover 124. The foldable support portion 133 may be correspondingly attached to the foldable display portion 113 of the flexible display screen 110, and the foldable support portion 133 may be located between the foldable display portion 113 and the hinge mechanism 125.

[0163] During normal operation of the flexible display screen 110, electronic components (such as light-emitting diodes and semiconductors) within the flexible display screen 110 accumulate electrical charge. Excessive charge accumulation on the flexible display screen 110 may affect its normal operation. The foldable support plate 130 can be electrically connected to the flexible display screen 110, thereby transferring excess charge from the flexible display screen 110 and improving the radio frequency performance of the foldable electronic device 100 (e.g., reducing radiated spurious emissions (RSE)). In one example, the foldable support plate 130 and the flexible display screen 110 can be bonded together, for example, using a conductive adhesive layer (such as conductive foam, conductive double-sided mesh adhesive, etc.). The thickness of the conductive adhesive layer can be, for example, approximately 0.05 mm.

[0164] The following is combined Figure 4 , Figure 5 This paper details the structure and function of a foldable support plate 130. Figure 4Looking at the foldable support plate 130 in the X direction as shown by the dashed line, we can obtain the following: Figure 5 The schematic structural diagram of the foldable support plate 130 shown.

[0165] The foldable support plate 130 may include one or more partial plating layers 138. The partial plating layer 138 may be, for example, a nickel plating layer. The partial plating layer 138 may be obtained, for example, by electroplating. The partial plating layer 138 may serve as a pin of the foldable support plate 130. The partial plating layer 138 may be disposed, for example, on the first support portion 131 or the second support portion 132. Figure 6 It shows Figure 5 AA view in the image. For example... Figure 6 As shown, the partial plating 138 can, for example, be provided on the second support portion 132. Combined with... Figure 4 It can be seen that the partial coating 138 can face or be close to the housing of the foldable electronic device 100, and is disposed on one side of the first support portion 131 or the second support portion 132. That is, the partial coating 138 can face away from or be away from the flexible display screen 110, and is disposed on one side of the first support portion 131 or the second support portion 132. As can be seen from the above, the partial coating 138 and the flexible display screen 110 can be electrically connected through the first support portion 131 or the second support portion 132.

[0166] The side of the partial coating 138 facing away from or away from the foldable support plate 130 can be grounded. For example, a grounding line and an electrical connector (such as a spring) can be provided on the mid-frame of the foldable electronic device 100, and the electrical connector is conductive to the grounding line. The partial coating 138 is electrically connected to the grounding line through the electrical connector. As another example, an electrical connector (such as a spring) can be provided on the side frame of the foldable electronic device 100, and this side frame is conductive to the hand holding the foldable electronic device 100. The partial coating 138 is electrically connected to this side frame through the electrical connector. Thus, excess charge on the flexible display screen 110 can be conducted to ground through the partial coating 138.

[0167] The foldable support plate 130 may include multiple non-connected through slots 1331. The through slots 1331 may be disposed in the foldable support portion 133 of the foldable support plate 130. The through slots 1331 may penetrate through the foldable support portion 133. The through slots 1331 may be formed, for example, by chemical etching. Figure 5 In the example shown, the first and second through slots on the foldable support plate 130 can, for example, be arranged parallel to each other. When the foldable support plate 130 is in the unfolded state, adjacent through slots can be spaced apart from each other. Optionally, combined with... Figure 4 , Figure 5Along the width or length of the through groove, part or all of the area of ​​the first through groove can be projected onto the second through groove, and the first and second through grooves can be two adjacent through grooves. Providing the through groove 1331 on the foldable support portion 133 of the foldable support plate 130 helps to reduce the external force required to bend the foldable support portion 133.

[0168] exist Figure 5 In the example shown, the port shape of the through slot 1331 can be racetrack-shaped. For example... Figure 7 As shown, the racetrack-shaped port may include two semicircular arcs and a line segment connecting the two semicircular arcs. The line segment may be tangent to the two arcs, and the openings of the two semicircular arcs may be face-to-face. In one example, the radius r1 of the semicircular arcs may be, for example, 0.1 to 0.2 mm. The racetrack-shaped port of the through-slot 1331 helps to reduce stress concentration near the through-slot 1331 when bending the foldable electronic device 100, thereby helping to delay damage to the through-slot 1331.

[0169] The following is combined Figure 8 This paper describes a possible processing technology for a flexible screen module 200, wherein the flexible screen module 200 may include... Figure 4 The flexible display screen 110, the foldable support plate 130, and the conductive adhesive layer 140 are shown.

[0170] First, stainless steel coil 710 is sliced ​​to obtain stainless steel sheet 720. Stainless steel sheet 720 may include, for example... Figure 4 , Figure 5 The first support portion 131, the second support portion 132, and the foldable support portion 133 are shown. Then, one or more partial plating layers 138 are provided on the first support portion 131 and / or the second support portion 132 of the stainless steel sheet 720, and multiple through grooves 1331 are machined on the foldable support portion 133 of the stainless steel sheet 720 to obtain... Figure 4 , Figure 5 The foldable support plate 130 is shown. In this embodiment, the processing order of the partial plating layer 138 and the through-groove 1331 is not limited. Then, the side of the foldable support plate 130 away from the partial plating layer 138 is bonded to the flexible display screen 110 via the conductive adhesive layer 140, ultimately yielding... Figure 9 or Figure 10 The flexible screen module 200 shown.

[0171] Figure 9 , Figure 10 Two possible folding states of the flexible screen module 200 are shown. Figure 9 A flexible screen module 200 that folds inward is shown. Figure 10 A flexible screen module 200 that folds outwards is shown.

[0172] The density of stainless steel can be approximately 7.9 g / cm³. 3 Combining Figures 4 to 10 As shown in the example, in a foldable electronic device 100 including an 8-inch flexible display 110, the weight of the foldable support plate 130 can exceed 23g. The relatively heavy weight of the foldable support plate 130 may contribute to a relatively heavy overall weight of the foldable electronic device 100. Furthermore, the remanence of stainless steel can be relatively high, and the actual remanence state of stainless steel can vary considerably. This is detrimental to the normal operation of magnetically sensitive devices within the foldable electronic device 100.

[0173] In addition, applying a localized nickel plating to the stainless steel material can increase the impedance of the foldable support plate 130, thereby affecting the radio frequency performance of the foldable electronic device 100, such as reducing the amount of charge transferred on the flexible display screen 110.

[0174] And, as Figure 11 As shown, when the foldable support plate 130 is in the folded state, stress concentration may still occur at both ends of the racetrack-shaped through groove 1331. The bending performance of the foldable electronic device 100 is relatively poor.

[0175] Figure 12 This is a schematic structural diagram of another foldable support plate 130. The foldable support plate 130 may include a first support plate 1301, a second support plate 1302, and a third support plate 1303. The material of the first support plate 1301 may be, for example, stainless steel. The thickness of the first support plate 1301 may be, for example, approximately 0.03 mm.

[0176] Figure 13 It shows Figure 12 The BB view in the image. For example... Figure 13 As shown, the material of the second support plate 1302 may include, for example, a copper sheet 13021 and a plating layer 13022 surrounding the copper sheet 13021. The material of the plating layer 13022 may include, for example, nickel. The plating layer 13022 serves to protect the copper sheet 13021. The third support plate 1303 may have a structure similar to that of the second support plate 1302. The thickness of the second support plate 1302 and the third support plate 1303 may, for example, be approximately 0.2 mm.

[0177] The first support plate 1301 may include a first part 13011, a second part 13012, and a foldable part 13013. (Combined) Figure 4 , Figure 12The second support plate 1302 can be attached to the first portion 13011 and is located on the side of the first portion 13011 away from the flexible display screen 110. The first portion 13011 and the second support plate 1302 can correspond to the first support portion 131 of the foldable support plate 130. Figure 4 , Figure 12 The third support plate 1303 can be attached to the second portion 13012 and is located on the side of the second portion 13012 away from the flexible display screen 110. The second portion 13012 and the third support plate 1303 can correspond to the second support portion 132 of the foldable support plate 130. The foldable portion 13013 can correspond to the foldable support portion 133 of the foldable support plate 130. Figure 12 In the example shown, the foldable portion 13013 can provide support for the foldable display section 113 of the flexible display 110.

[0178] The first support plate 1301 and the first part 13011 may not be electrically connected. Similarly, the first support plate 1301 and the second part 13012 may not be electrically connected. For example, the adhesive material between the first support plate 1301 and the first part 13011, and the adhesive material between the first support plate 1301 and the second part 13012, may both be insulating materials.

[0179] The following is combined Figure 14 This paper describes a possible processing technology for a flexible screen module 200, wherein the flexible screen module 200 may include... Figure 4 The flexible display screen 110 shown Figure 12 The foldable support plate 130 shown includes a first adhesive layer 1410, a second adhesive layer 1420, and a third adhesive layer 1430. The thickness of the first adhesive layer 1410, the second adhesive layer 1420, and the third adhesive layer 1430 can be, for example, approximately 0.05 mm. In one example, the first adhesive layer 1410, the second adhesive layer 1420, and the third adhesive layer 1430 can all be insulating materials. Optionally, the first adhesive layer 1410 and the second adhesive layer 1420 can be mesh adhesive. Optionally, the third adhesive layer 1430 can be optically clear adhesive (OCA).

[0180] First, the stainless steel coil 710 is sliced ​​to obtain a first support plate 1301. Then, a copper thin film 13021 is electroplated with a coating 13022 on its outer periphery to obtain a second support plate 1302 and a third support plate 1303. The processing order of the first support plate 1301, second support plate 1302, and third support plate 1303 is not limited in this embodiment. Subsequently, in conjunction with... Figure 12Through the first adhesive layer 1410, the second support plate 1302 can be attached to the first portion 13011 of the first support plate 1301; through the second adhesive layer 1420, the third support plate 1303 can be attached to the second portion 13012 of the first support plate 1301; and through the third adhesive layer 1430, the flexible display screen 110 can be attached to the first support plate 1301, thus obtaining... Figure 15 or Figure 16 The flexible screen module 200 shown is provided. The second support plate 1302 and the third support plate 1303 can be attached to one side of the first support plate 1301, and the flexible display screen 110 is attached to the other side of the first support plate 1301.

[0181] Figure 15 , Figure 16 Two possible folding states of the flexible screen module 200 are shown. Figure 15 A flexible screen module 200 that folds inward is shown. Figure 16 A flexible screen module 200 that folds outwards is shown.

[0182] The density of stainless steel can be approximately 7.9 g / cm³. 3 The density of copper can be approximately 8.95 g / cm³. 3 Combining Figures 12 to 16 As shown in the example, in a foldable electronic device 100 including an 8-inch flexible display 110, the weight of the foldable support plate 130 can exceed 30g. The relatively heavy weight of the foldable support plate 130 may result in a relatively heavy overall weight of the foldable electronic device 100.

[0183] Furthermore, the foldable display section 113 of the flexible display 110 relies on the first support plate 1301, and the thickness of the first support plate 1301 is relatively small. Therefore, the foldable electronic device 100 may have relatively poor resistance to compression, impact, and bending life.

[0184] Furthermore, since the second support plate 1302 and the third support plate 1303 can be made of copper thin material 13021, and copper thin material 13021 is relatively easy to oxidize, electroplating the entire copper thin material 13021 with a coating 13022 would result in higher costs and more complex processes.

[0185] Furthermore, when folding the foldable electronic device 100, it is necessary to avoid the second support plate 1302 and the third support plate 1303 contacting the first support plate 1301. This is to reduce the probability of conductivity between the second support plate 1302 and the first support plate 1301, and between the third support plate 1303 and the first support plate 1301, thereby stabilizing or ensuring the disconnection relationship between the three support plates. Therefore, ink needs to be printed at the edge of the second support plate 1302 near the first support plate 1301, and at the edge of the third support plate 1303 near the first support plate 1301. This may increase the manufacturing complexity of the foldable support plate 130, reduce its yield, and increase its cost.

[0186] This application provides a new foldable support plate 130, flexible screen module 200, and foldable electronic device 100. The purpose is to enable the foldable support plate 130 to have relatively light weight, relatively high mechanical stability, and relatively good radio frequency performance, thereby improving the overall performance of the foldable electronic device 100.

[0187] Figure 17 This is a schematic structural diagram of a foldable electronic device 100 provided in an embodiment of this application. The foldable electronic device 100 may include a flexible screen module 200 and a hinge mechanism 125. Figure 17 In the example shown, the hinge mechanism 125 can cause the flexible screen module 200 to fold inward. When the flexible screen module 200 is in the position shown... Figure 17 In the inward-folded state shown, the flexible screen module 200 can form a roughly teardrop-shaped gap in the area near the hinge mechanism 125. The following section combines... Figure 18 , Figure 19 This application describes a flexible screen module 200 provided in an embodiment.

[0188] Figure 18 , Figure 19 It is aimed at Figure 17 A partially enlarged view of the flexible screen module 200. The flexible screen module 200 may include a flexible display screen 110 and a foldable support plate 130. (As shown...) Figure 18 , Figure 19 As shown, the flexible screen module 200 is currently in an inward folding state.

[0189] The flexible display screen 110 may include a first display unit 111, a first transition display unit 114, a foldable display unit 113, a second transition display unit 115, and a second display unit 112 connected in sequence. The first transition display unit 114 may be connected between the first display unit 111 and the foldable display unit 113, and the second transition display unit 115 may be connected between the second display unit 112 and the foldable display unit 113.

[0190] The foldable support plate 130 may include a first support portion 131, a first transition support portion 134, a foldable support portion 133, a second transition support portion 135, and a second support portion 132 connected in sequence. The first transition support portion 134 may be connected between the first support portion 131 and the foldable support portion 133, and the second transition support portion 135 may be connected between the second support portion 132 and the foldable support portion 133.

[0191] The first support portion 131 can be correspondingly attached to the first display portion 111, thereby providing mechanical support for the first display portion 111. The second support portion 132 can be correspondingly attached to the second display portion 112, thereby providing mechanical support for the second display portion 112. The first transition support portion 134 can be correspondingly attached to the first transition display portion 114, thereby providing mechanical support for the first transition display portion 114. The second transition support portion 135 can be correspondingly attached to the second transition display portion 115, thereby providing mechanical support for the second transition display portion 115. The foldable support portion 133 can be correspondingly attached to the foldable display portion 113, thereby providing mechanical support for the foldable display portion 113.

[0192] In one example, when the flexible display screen 110 is in the unfolded state, the first display section 111, the first transition display section 114, the foldable display section 113, the second transition display section 115, and the second display section 112 can all be in a flat state. Correspondingly, when the flexible display screen 110 is in the unfolded state, the foldable support plate 130 can also be in the unfolded state, and the first support section 131, the first transition support section 134, the foldable support section 133, the second transition support section 135, and the second support section 132 can all be in a flat state. "A is in a flat state" means that any two different positions of A can be considered to be on the same plane.

[0193] like Figure 18 , Figure 19 As shown, when the flexible display screen 110 is in a folded state, the foldable display section 113 can be in a bent state. Correspondingly, the foldable support section 133 can be in a bent state.

[0194] like Figure 18 , Figure 19As shown, when the flexible display screen 110 is in a folded state, both the first display section 111 and the second display section 112 can be in a flat state. Correspondingly, both the first support section 131 and the second support section 132 can be in a flat state.

[0195] like Figure 18 , Figure 19 As shown, when the flexible display screen 110 is in a folded state, both the first transition display portion 114 and the second transition display portion 115 can be in a (micro)bent state (the curvature of the (micro)bent state can be smaller than the curvature of the folded state). Specifically, the curvature of the first transition display portion 114 can be smaller than the curvature of the foldable display portion 113, and the curvature of the second transition display portion 115 can be smaller than the curvature of the foldable display portion 113. The first transition display portion 114 can act as a transition between the flat state of the first display portion 111 and the bent state of the foldable display portion 113, and the second transition display portion 115 can act as a transition between the flat state of the second display portion 112 and the bent state of the foldable display portion 113.

[0196] Accordingly, when the flexible display screen 110 is in a folded state, both the first transition support portion 134 and the second transition support portion 135 can be in a (slightly) bent state. The bending radius of the first transition support portion 134 can be smaller than that of the foldable support portion 133, and the bending radius of the second transition support portion 135 can also be smaller than that of the foldable support portion 133. The first transition support portion 134 can act as a transition between the flat state of the first support portion 131 and the bent state of the foldable support portion 133, and the second transition support portion 135 can act as a transition between the flat state of the second support portion 132 and the bent state of the foldable support portion 133.

[0197] In one example, the foldable support plate 130 is positioned as follows: Figure 18 , Figure 19 In the folded state shown, the bending radius of the foldable support 133 can be R. The length a1 of the foldable support 133 can be, for example, 2πR*(0.5 to 0.8). The length a3 of the first transition support 134 or the second transition support 135 can be, for example, R*(1.5 to 1.2).

[0198] Optional, such as Figure 18 , Figure 19As shown, a third transition support 136 may be provided between the first transition support 134 and the foldable support 133. Correspondingly, a third transition display 116 may be provided between the first transition display 114 and the foldable display 113. The third transition support 136 can be correspondingly attached to the third transition display 116, thereby providing mechanical support for the third transition display 116. The width a2 of the third transition support 136 may be, for example, R*(1.2~1.8).

[0199] When the flexible display screen 110 is in a folded state, the curvature of the third transition support portion 136 can be smaller than that of the first transition support portion 134 and smaller than that of the foldable support portion 133. For example, when the flexible display screen 110 is in a folded state, the first transition support portion 134 can be in an outwardly bent state, and the foldable support portion 133 can be in an inwardly bent state. The third transition support portion 136 can be in a flat state. The third transition support portion 136 can serve as a transition between the outward (slight) bent state of the first transition support portion 134 and the inward bent state of the foldable support portion 133.

[0200] Similarly, a fourth transition support 137 may be provided between the second transition support 135 and the foldable support 133. Correspondingly, a fourth transition display 117 may be provided between the second transition display 115 and the foldable display 113. The fourth transition support 137 can be attached to the fourth transition display 117, thereby providing mechanical support for the fourth transition display 117. The width of the fourth transition support 137 may, for example, be R*(1.2~1.8).

[0201] When the flexible display screen 110 is in a folded state, the curvature of the fourth transition support portion 137 can be less than the curvature of the second transition support portion 135 and less than the curvature of the foldable support portion 133. For example, when the flexible display screen 110 is in a folded state, the second transition support portion 135 can be in an outwardly bent state, and the foldable support portion 133 can be in an inwardly bent state. The fourth transition support portion 137 can be in a flat state. The fourth transition support portion 137 can serve as a transition between the outward (slight) bent state of the second transition support portion 135 and the inward bent state of the foldable support portion 133.

[0202] By providing a first transition support portion 134 and a second transition support portion 135 on the foldable support plate 130, it is beneficial for the first support portion 131 and the second support portion 132 to fit together relatively tightly, meaning the gap between the first support portion 131 and the second support portion 132 is relatively small. For example, the second support portion 132 and the first support portion 131 can be arranged parallel to each other. When the user places the foldable electronic device 100 in, for example, a pocket or bag, small parts in the pocket or bag are less likely to fall into the gap between the first support portion 131 and the second support portion 132, which helps improve the protection of the flexible display screen 110. Furthermore, the area of ​​the foldable electronic device 100 that is relatively far from the foldable area can have a relatively thin thickness, laying the foundation for reducing the thickness of the foldable electronic device 100.

[0203] Furthermore, by providing a first transition support portion 134 and a second transition support portion 135 on the foldable support plate 130, the folding radius R of the foldable support portion 133 can be relatively large. Since both the first transition support portion 134 and the second transition support portion 135 are provided with blind grooves 1332, it is beneficial to improve the bending flexibility of the first transition support portion 134 and the second transition support portion 135. When the first support portion 131 and the second support portion 132 are tightly fitted, if the foldable support plate 130 does not have such blind grooves 1332... Figure 19 The transition support portion shown has a relatively small folding radius R for the foldable support portion 133. A relatively small folding radius R means the inward-folding side of the flexible display screen 110 is subjected to greater compression, making it prone to wrinkles. This also makes the multi-layered components within the flexible display screen 110 more likely to detach, resulting in a relatively shorter lifespan for the flexible display screen 110. Furthermore, a relatively small folding radius R results in greater bending stress on the foldable support portion 133, potentially reducing its bending performance. Conversely, a relatively large folding radius R means less compression on the inward-folding side of the flexible display screen 110, reducing the likelihood of wrinkles. This also makes it less likely for the multi-layered components within the flexible display screen 110 to detach, resulting in a relatively longer lifespan for the flexible display screen 110. Additionally, a relatively large folding radius R helps reduce the bending stress on the foldable support portion 133, thereby improving its bending performance and lifespan.

[0204] The following is combined Figures 19 to 29 This paper describes a foldable support plate 130 provided in an embodiment of this application.

[0205] like Figure 20 As shown, the foldable support plate 130 may include a support plate base 1300. The thickness of the support plate base 1300 may be less than 0.3 mm, for example, it may be 0.1 to 0.2 mm, such as 0.15 mm.

[0206] In one example, the material of the support plate substrate 1300 may include, but is not limited to, at least one of the following: titanium and titanium alloys (such as industrial pure titanium α titanium alloy 4 (TA4), with a density of approximately 4.5 g / cm3), stainless steel, aluminum alloy, copper alloy, nickel alloy, magnesium alloy, amorphous alloy (such as titanium-based amorphous, zirconium-based amorphous, iron-based amorphous, etc.), titanium-copper composite material, titanium-aluminum composite material, titanium-steel composite material, nickel-titanium shape memory alloy (Ti-Ni), steel-copper composite material, steel-aluminum composite material, and copper-titanium-copper composite material.

[0207] Optionally, the support plate substrate 1300 may also include a reinforcing material. The reinforcing material may be in the form of granules or fibers. The metal containing the reinforcing material may be referred to as the reinforcing metal. The support plate substrate 1300 may also include, but is not limited to, at least one of the following reinforcing materials: silicon carbide particles, silicon carbide whiskers, titanium carbide particles, titanium carbide whiskers, carbon fibers, etc.

[0208] For example, titanium alloys that include reinforcing materials can be called titanium-based reinforced alloys, titanium alloys that include particulate reinforcing materials can be called titanium-based particulate reinforced alloys, and titanium alloys that include fibrous reinforcing materials can be called titanium-based fiber reinforced alloys.

[0209] For example, steel alloys that include reinforcing materials can be called steel-based reinforced alloys. Steel alloys that include particulate reinforcing materials can be called steel-based particulate reinforced alloys, and steel alloys that include fibrous reinforcing materials can be called steel-based fiber reinforced alloys.

[0210] For example, aluminum alloys that include reinforcing materials can be called aluminum-based reinforced alloys. Aluminum alloys that include particulate reinforcing materials can be called aluminum-based particulate reinforced alloys, and aluminum alloys that include fibrous reinforcing materials can be called aluminum-based fiber reinforced alloys.

[0211] For example, copper alloys that include reinforcing materials can be called copper-based reinforced alloys. Copper alloys that include particulate reinforcing materials can be called copper-based particulate reinforced alloys, and copper alloys that include fibrous reinforcing materials can be called copper-based fiber reinforced alloys.

[0212] For example, nickel alloys that include reinforcing materials can be called nickel-based reinforced alloys. Nickel alloys that include particulate reinforcing materials can be called nickel-based particulate reinforced alloys, and nickel alloys that include fibrous reinforcing materials can be called nickel-based fiber reinforced alloys.

[0213] For example, magnesium alloys that include reinforcing materials can be called magnesium-based reinforced alloys. Magnesium alloys that include particulate reinforcing materials can be called magnesium-based particulate reinforced alloys, and magnesium alloys that include fibrous reinforcing materials can be called magnesium-based fiber reinforced alloys.

[0214] The following is combined Figure 21 , Figure 22 This application describes the various support plate substrates 1300 provided in this application.

[0215] like Figure 21 As shown in 2001, the support plate substrate 1300 can be made of a single-phase material. For example, the material of the support plate substrate 1300 can be any of the following: titanium and titanium alloys, stainless steel, aluminum alloys, copper alloys, nickel alloys, magnesium alloys, amorphous alloys (such as titanium-based amorphous, zirconium-based amorphous, iron-based amorphous, etc.), titanium-copper composites, titanium-aluminum composites, titanium-steel composites, nickel-titanium shape memory alloys (Ti-Ni), steel-copper composites, steel-aluminum composites, copper-titanium-copper composites, titanium-based reinforced alloys, steel-based reinforced alloys, aluminum-based reinforced alloys, copper-based reinforced alloys, nickel-based reinforced alloys, magnesium-based reinforced alloys, etc. Figure 20 As can be seen, in one example, the first support portion 131, the first transition support portion 134, the third transition support portion 136, the foldable support portion 133, the fourth transition support portion 137, the second transition support portion 135, and the second support portion 132 of the foldable support plate 130 can respectively correspond to the seven regions of the single-phase support plate substrate 1300.

[0216] In other examples, the support plate substrate 1300 may include a multiphase material.

[0217] like Figure 21 As shown in 2002 and 2003, the support plate substrate 1300 may include a first substrate portion 2011 and a second substrate portion 2012 stacked together. (In conjunction with...) Figure 20 As can be seen, in one example, the first support portion 131, the first transition support portion 134, the third transition support portion 136, the foldable support portion 133, the fourth transition support portion 137, the second transition support portion 135, and the second support portion 132 of the foldable support plate 130 can respectively correspond to the seven regions of the first base portion 2011 and the seven regions of the second base portion 2012. The second base portion 2012 can be disposed on the first base portion 2011, for example, by means of hot rolling, electroplating, etc.

[0218] The material of the first substrate portion 2011 and the material of the second substrate portion 2012 may be different. The materials of the first substrate portion 2011 and the second substrate portion 2012 may be any two of the following: titanium and titanium alloys, stainless steel, aluminum alloys, copper alloys, nickel alloys, magnesium alloys, amorphous alloys (such as titanium-based amorphous, zirconium-based amorphous, iron-based amorphous, etc.), titanium-copper composites, titanium-aluminum composites, titanium-steel composites, nickel-titanium shape memory alloys (Ti-Ni), steel-copper composites, steel-aluminum composites, copper-titanium-copper composites, titanium-based reinforced alloys, steel-based reinforced alloys, aluminum-based reinforced alloys, copper-based reinforced alloys, nickel-based reinforced alloys, and magnesium-based reinforced alloys.

[0219] In the flexible screen module 200, the interface between the first substrate portion 2011 and the second substrate portion 2012 can be arranged parallel to the flexible display screen 110. The parallel arrangement of the interface relative to the flexible display screen 110 means that a target plane perpendicular to the interface can intersect with the flexible display screen 110 to form a target line segment, and the angle between the tangent plane of the flexible display screen 110 on this target line segment and the target plane can be approximately 90°. In other words, the shapes of the first substrate portion 2011 and the second substrate portion 2012 can correspond to the shape of the flexible display screen 110. For example, the shapes of the first substrate portion 2011 and the second substrate portion 2012 can both be obtained by offsetting the shape of the flexible display screen 110.

[0220] In one possible example, the strength or stiffness of the first substrate portion 2011 can be higher than that of the second substrate portion 2012, and the thickness of the first substrate portion 2011 can be greater than that of the second substrate portion 2012. That is, the first substrate portion 2011 can dominate the mechanical properties of the foldable support plate 130, while the second substrate portion 2012 can influence the mechanical properties of the foldable support plate 130 based on the first substrate portion 2011. In this case, the two end faces of the foldable support plate 130 can have different mechanical properties such as strength, stiffness, and hardness. For example, the material of the first substrate portion 2011 is titanium or titanium alloy, and the material of the second substrate portion 2012 is aluminum alloy or copper alloy. Using aluminum alloy on top of titanium or titanium alloy helps to further reduce the weight of the foldable support plate 130. Using copper alloy on top of titanium or titanium alloy helps to improve the heat dissipation performance of the foldable support plate 130 and reduce the probability of overheating in the flexible display screen 110 and other components in the foldable electronic device 100.

[0221] like Figure 21 As shown in Figure 2002, in one example, the flexible display screen 110 is attached to the second substrate portion 2012 side of the support plate substrate 1300. The second substrate portion 2012 can be located between the first substrate portion 2011 and the flexible display screen 110. That is, the second substrate portion 2012 can be closer to the flexible display screen 110 than the first substrate portion 2011. Attaching the relatively softer side of the support plate substrate 1300 to the flexible display screen 110 helps to improve the flatness of the flexible display screen 110.

[0222] like Figure 21As shown in Figure 2002, in another example, the flexible display screen 110 is attached to the first substrate portion 2011 side of the support plate substrate 1300. The first substrate portion 2011 may be located between the second substrate portion 2012 and the flexible display screen 110. That is, the first substrate portion 2011 may be closer to the flexible display screen 110 than the second substrate portion 2012. Attaching the relatively rigid side of the support plate substrate 1300 to the flexible display screen 110 is beneficial to the compressive strength of the flexible display screen 110.

[0223] like Figure 21 As shown in Figure 2003, the support plate substrate 1300 may include a first substrate portion 2011, a second substrate portion 2012, and a third substrate portion 2013 stacked together. The first substrate portion 2011 may be located between the second substrate portion 2012 and the third substrate portion 2013. Figure 20 As can be seen, in one example, the first support portion 131, the first transition support portion 134, the third transition support portion 136, the foldable support portion 133, the fourth transition support portion 137, the second transition support portion 135, and the second support portion 132 of the foldable support plate 130 can respectively correspond to the seven regions of the first base portion 2011, the seven regions of the second base portion 2012, and the seven regions of the third base portion 2013. The support plate base 1300 shown in 2003 can be obtained, for example, by hot rolling, electroplating, or other methods.

[0224] The material of the first matrix portion 2011 is different from the material of the second matrix portion 2012, and the material of the second matrix portion 2012 can be the same as or different from the material of the third matrix portion 2013. The material properties of the second matrix portion 2012 can be similar to or slightly different from those of the material properties of the third matrix portion 2013. For example, the materials of the first matrix portion 2011, the second matrix portion 2012, and the third matrix portion 2013 can be any two or three of the following: titanium and titanium alloys, stainless steel, aluminum alloys, copper alloys, nickel alloys, magnesium alloys, amorphous alloys (such as titanium-based amorphous, zirconium-based amorphous, iron-based amorphous, etc.), titanium-copper composites, titanium-aluminum composites, titanium-steel composites, nickel-titanium shape memory alloys (Ti-Ni), steel-copper composites, steel-aluminum composites, copper-titanium-copper composites, titanium-based reinforced alloys, steel-based reinforced alloys, aluminum-based reinforced alloys, copper-based reinforced alloys, nickel-based reinforced alloys, and magnesium-based reinforced alloys.

[0225] In the flexible screen module 200, the interface between the first substrate portion 2011 and the third substrate portion 2013 can be arranged parallel to the flexible display screen 110. For example, the shape of the first substrate portion 2011, the shape of the second substrate portion 2012, and the shape of the third substrate portion 2013 can all be obtained by offsetting the shape of the flexible display screen 110.

[0226] In one possible example, the strength or stiffness of the first substrate portion 2011 may be higher than that of the second substrate portion 2012, and also higher than that of the third substrate portion 2013. The thickness of the first substrate portion 2011 may be greater than that of the second substrate portion 2012, and also greater than that of the third substrate portion 2013. That is, the first substrate portion 2011 can dominate the mechanical properties of the foldable support plate 130, while the second substrate portion 2012 and the third substrate portion 2013 can both influence the mechanical properties of the foldable support plate 130 on the substrate of the first substrate portion 2011. For example, the material of the first substrate portion 2011 may be titanium or a titanium alloy, while the materials of the second substrate portion 2012 and the third substrate portion 2013 may both be aluminum alloys or copper alloys.

[0227] like Figure 21 As shown in Figure 2004, the support plate substrate 1300 may include a first substrate portion 2011, a second substrate portion 2012, and a third substrate portion 2013. The first substrate portion 2011 may be located between the second substrate portion 2012 and the third substrate portion 2013. In one example, two adjacent substrate portions (such as the first substrate portion 2011 and the second substrate portion 2012, or the first substrate portion 2011 and the third substrate portion 2013) may be bonded together with adhesive, solid adhesive film, etc. In another example, two adjacent substrate portions may be fixed together by welding. In yet another example, two adjacent substrate portions may be connected by hot rolling, for example.

[0228] Combination Figure 18 In the flexible screen module 200 shown in Figure 19, the interfaces between the first substrate portion 2011 and the second substrate portion 2012, and the interfaces between the first substrate portion 2011 and the third substrate portion 2013, can all be vertically arranged relative to the flexible display screen 110. The vertical arrangement of the interfaces relative to the flexible display screen 110 means that the target plane containing the interfaces intersects with the flexible display screen 110 to form a target line segment, and the angle between the tangent plane of the flexible display screen 110 on this target line segment and the target plane can be approximately 90°.

[0229] The first base portion 2011, the second base portion 2012, and the third base portion 2013 can each correspond to a portion of the foldable support plate 130. In the example shown in 2004, this application embodiment is not intended to limit the specific areas of the foldable support plate 130 corresponding to the first base portion 2011, the second base portion 2012, and the third base portion 2013.

[0230] In one example, the first base portion 2011 may correspond to the first transition support portion 134, the second transition support portion 135, the third transition support portion 136, the fourth transition support portion 137, and the foldable support portion 133 of the foldable support plate 130; the second base portion 2012 may correspond to the first support portion 131 of the foldable support plate 130; and the third base portion 2013 may correspond to the second support portion 132 of the foldable support plate 130.

[0231] In another example, the first base portion 2011 may correspond to the foldable support portion 133, the third transition support portion 136, and the fourth transition support portion 137 of the foldable support plate 130. The second base portion 2012 may correspond to the first support portion 131 and the first transition support portion 134 of the foldable support plate 130, and the third base portion 2013 may correspond to the second support portion 132 and the second transition support portion 135 of the foldable support plate 130.

[0232] In another example, the first base portion 2011 may correspond to the foldable support portion 133 of the foldable support plate 130, the second base portion 2012 may correspond to the first transition support portion 134, the third transition support portion 136, and the first support portion 131 of the foldable support plate 130, and the third base portion 2013 may correspond to the second transition support portion 135, the fourth transition support portion 137, and the second support portion 132 of the foldable support plate 130.

[0233] The material of the first substrate portion 2011 is different from the material of the second substrate portion 2012. The material of the second substrate portion 2012 and the material of the third substrate portion 2013 may be the same or different. The material properties of the second substrate portion 2012 may be similar to or slightly different from those of the material properties of the third substrate portion 2013.

[0234] The strength or stiffness of the first base portion 2011 can be higher than that of the second base portion 2012. For example, the material of the first base portion 2011 is titanium or titanium alloy, and the material of the second base portion 2012 is aluminum alloy or copper alloy. That is to say, for the bendable area of ​​the foldable support plate 130 (which may include the foldable support portion 133, and may also include part or all of the area of ​​the first transition support portion 134 and the second transition support portion 135), using a material with relatively high strength or stiffness and higher rigidity is beneficial to improving the bending performance of the foldable support plate 130 in local areas. For the flat area of ​​the foldable support plate 130 (which may include the first support portion 131 and the second support portion 132), using a material with relatively low strength or stiffness and lower rigidity, that is, in areas where bending is not required, a material with high bending performance can be omitted, which is beneficial to taking into account other properties of the foldable support plate 130 (such as portability, heat dissipation, etc.).

[0235] Figure 21 The 2005 example is slightly different from the 2004 example. Figure 21 Compared to 2004, the surface of the first base portion 2011 facing the second base portion 2012 is the first side surface 20111. When the support plate base 1300 is in the unfolded state, the angle θ1 between the first side surface 20111 and the first end face of the first base portion 2011 (the first end face of the first base portion 2011 can be the upper surface or the lower surface of the first base portion 2011) can take the value: 0 < θ1 < 90°. For example, θ1 can be 30°, 45°, or 60°. The first end face can be the exposed surface of the first base portion 2011.

[0236] Similarly, the surface of the first base portion 2011 facing the third base portion 2013 is the second side surface 20112. When the support plate base 1300 is in the unfolded state, the angle between the second side surface 20112 and the first end face of the first base portion 2011 can be greater than 0° and less than 90°.

[0237] The example shown in 2005 is beneficial for increasing the bonding force between two adjacent substrate portions. The support plate substrate 1300 shown in 2005 can be obtained, for example, by hot rolling.

[0238] like Figure 21 As shown in Figures 2006 and 2007, the support plate substrate 1300 may include a first substrate portion 2011 and a second substrate portion 2012. The second substrate portion 2012 may include a substrate groove for receiving the first substrate portion 2011. The first substrate portion 2011 may be received within the substrate groove of the second substrate portion 2012. The second substrate portion 2012 may cover the first end face 20113, the first side face 20111, and the second side face 20112 of the first substrate portion 2011. That is, the first end face 20113, the first side face 20111, and the second side face 20112 of the first substrate portion 2011 all face the second substrate portion 2012. The first end face 20113 may connect between the first side face 20111 and the second side face 20112. The first end face may be the exposed surface of the first substrate portion 2011. The support plate substrate 1300 shown in Figures 2006 and 2007 may be obtained, for example, by hot rolling.

[0239] In one example, the regions of the first base portion 2011 and the second base portion 2012 facing the first end face 20113 can correspond to the first transition support portion 134, the second transition support portion 135, the third transition support portion 136, the fourth transition support portion 137, and the foldable support portion 133 of the foldable support plate 130, and the remaining regions of the second base portion 2012 can correspond to the first support portion 131 and the second support portion 132 of the foldable support plate 130.

[0240] In another example, the regions of the first base portion 2011 and the second base portion 2012 facing the first end face 20113 can correspond to the foldable support portion 133, the third transition support portion 136, and the fourth transition support portion 137 of the foldable support plate 130. The remaining region of the second base portion 2012 can correspond to the first support portion 131, the first transition support portion 134, the second support portion 132, and the second transition support portion 135 of the foldable support plate 130.

[0241] In another example, the regions of the first base portion 2011 and the second base portion 2012 facing the first end face 20113 can correspond to the foldable support portion 133 of the foldable support plate 130, and the remaining regions of the second base portion 2012 can correspond to the first transition support portion 134, the first support portion 131, the second transition support portion 135, the second support portion 132, the third transition support portion 136, and the fourth transition support portion 137 of the foldable support plate 130.

[0242] The materials of the first substrate portion 2011 and the second substrate portion 2012 may be different. In one example, the strength or stiffness of the first substrate portion 2011 may be higher than that of the second substrate portion 2012. For example, the material of the first substrate portion 2011 may be titanium or titanium alloy, and the material of the second substrate portion 2012 may be aluminum alloy or copper alloy.

[0243] In the example shown in 2006, when the support plate base 1300 is in the unfolded state, the included angle between the first side surface 20111 and the first end surface 20113 can be 90°. In the example shown in 2007, when the support plate base 1300 is in the unfolded state, the included angle θ between the first side surface 20111 and the first end surface 20113... 2a Possible values: 0° < θ 2a <90° (e.g.) Figure 21 (as shown in 20071), or, the angle θ between the first side surface 20111 and the first end surface 20113. 2b Possible values: 90° < θ 2b <180° (e.g.) Figure 21 (As shown in 20072).

[0244] Compared to the example shown in 2005, in the examples shown in 2006 and 2007, the area of ​​the interface between the first base portion 2011 and the second base portion 2012 is relatively larger, which is beneficial to increasing the bonding force between the two adjacent base portions. Compared to the example shown in 2006, the example shown in 2007 further increases the area of ​​the interface between the first base portion 2011 and the second base portion 2012. The second base portion 2012 has a dovetail structure, and the opening of the second base portion 2012 can be used to lock the first base portion 2011, thereby further increasing the bonding force between the two adjacent base portions.

[0245] Furthermore, in the example shown in 2004, the bonding process is relatively simple. There may be a height difference between the two end faces on the same side of the first substrate portion 2011 and the second substrate portion 2012, which could affect the flatness of the flexible display screen 110. In the examples shown in 2005, 2006, and 2007, the support plate substrate 1300 processed by the hot rolling process can have relatively high flatness.

[0246] like Figure 21 As shown in Figure 2008, the support plate substrate 1300 may include a first substrate portion 2011, a second substrate portion 2012, and a third substrate portion 2013. The first substrate portion 2011 may include a first recessed platform and a second recessed platform, which are located at opposite ends of the first substrate portion 2011 and disposed on the same end face of the first substrate portion 2011. The second substrate portion 2012 may be disposed on the first recessed platform, and the third substrate portion 2013 may be disposed on the second recessed platform. The support plate substrate 1300 shown in Figure 2008 may be obtained, for example, by hot rolling.

[0247] The surface of the first base portion 2011 facing the second base portion 2012 includes a first recessed surface 20114 and a first side surface 20111. The surface of the first base portion 2011 facing the third base portion 2013 includes a second recessed surface 20115 and a second side surface 20112. In the example shown in 2008, when the support plate base 1300 is in the unfolded state, the included angle θ3 between the first side surface 20111 and the first recessed surface 20114 can take the value: 0° < θ3 < 180°. Similarly, when the support plate base 1300 is in the unfolded state, the included angle between the second side surface 20112 and the second recessed surface 20115 can be greater than 0° and less than 180°.

[0248] In one example, the area of ​​the first base portion 2011 facing the second base portion 2012 and the second base portion 2012 can correspond to the first support portion 131 of the foldable support plate 130, and the area of ​​the first base portion 2011 facing the third base portion 2013 and the third base portion 2013 can correspond to the second support portion 132 of the foldable support plate 130. The remaining area of ​​the first base portion 2011 can correspond to the first transition support portion 134, the second transition support portion 135, the third transition support portion 136, the fourth transition support portion 137, and the foldable support portion 133 of the foldable support plate 130.

[0249] In another example, the area of ​​the first base portion 2011 facing the second base portion 2012 and the second base portion 2012 can correspond to the first support portion 131 and the first transition support portion 134 of the foldable support plate 130. The area of ​​the first base portion 2011 facing the third base portion 2013 and the third base portion 2013 can correspond to the second support portion 132 and the second transition support portion 135 of the foldable support plate 130. The remaining area of ​​the first base portion 2011 can correspond to the foldable support portion 133, the third transition support portion 136, and the fourth transition support portion 137 of the foldable support plate 130.

[0250] In another example, the area of ​​the first base portion 2011 facing the second base portion 2012 and the second base portion 2012 can correspond to the first transition support portion 134, the first support portion 131, and the third transition support portion 136 of the foldable support plate 130. The area of ​​the first base portion 2011 facing the third base portion 2013 and the third base portion 2013 can correspond to the second transition support portion 135, the second support portion 132, and the fourth transition support portion 137 of the foldable support plate 130. The remaining area of ​​the first base portion 2011 can correspond to the foldable support portion 133 of the foldable support plate 130.

[0251] The material of the first substrate portion 2011 is different from the material of the second substrate portion 2012. The material of the second substrate portion 2012 and the material of the third substrate portion 2013 may be the same or different. The material properties of the second substrate portion 2012 may be similar to or slightly different from those of the material properties of the third substrate portion 2013.

[0252] like Figure 21 As shown in Figure 2008, in one example, the second substrate portion 2012 and the third substrate portion 2013 may be located on the side of the first substrate portion 2011 facing or close to the flexible display screen 110. That is, the second substrate portion and the third substrate portion 2013 may be relatively close to the flexible display screen 110.

[0253] like Figure 21 As shown in Figure 2008, in another example, the second substrate portion 2012 and the third substrate portion 2013 may be located on the side opposite to or away from the flexible display screen 110 of the first substrate portion 2011. That is, the second substrate portion and the third substrate portion 2013 may be relatively far away from the flexible display screen 110.

[0254] Compared to the examples shown in 2006 and 2007, the example shown in 2008 has a relatively larger contact area between two adjacent substrate portions, which is beneficial for increasing the bonding force between the two adjacent substrate portions.

[0255] like Figure 21 As shown in 2009, the support plate substrate 1300 may include a first substrate portion 2011, a second substrate portion 2012, a fourth substrate portion 2014, a third substrate portion 2013, and a fifth substrate portion 2015.

[0256] The first base portion 2011 may include a first sinking platform, a second sinking platform, a third sinking platform, and a fourth sinking platform. The first and third sinking platforms are located at opposite ends of the first base portion 2011 and are connected to the first end face of the first base portion 2011. The second and fourth sinking platforms are located at opposite ends of the first base portion 2011 and are connected to the second end face of the first base portion 2011. The first and second end faces are located on the upper and lower sides of the first base portion 2011, respectively. The first and second sinking platforms may be located at the first end of the first base portion 2011 and on either side of the first base portion 2011. The sinking directions of the first and second sinking platforms are different. The third and fourth sinking platforms may be located at the second end of the first base portion 2011 and on either side of the first base portion 2011. The sinking directions of the third and fourth sinking platforms are different.

[0257] The second base portion 2012 can be disposed on the first recessed platform, the third base portion 2013 can be disposed on the second recessed platform, the fourth base portion 2014 can be disposed on the third recessed platform, and the fifth base portion 2015 can be disposed on the fourth recessed platform. The support plate base 1300 shown in 2009 can be obtained, for example, by hot rolling. The second base portion 2012 and the third base portion 2013 can face the upper and lower sides of the first base portion 2011 respectively, and the second base portion 2012 and the third base portion 2013 can be located at the first end of the first base portion 2011; the fourth base portion 2014 and the fifth base portion 2015 can face the upper and lower sides of the first base portion 2011 respectively, and the fourth base portion 2014 and the fifth base portion 2015 can be located at the second end of the first base portion 2011.

[0258] The surface of the first base portion 2011 facing the second base portion 2012 includes a first recessed surface 20114 and a first side surface 20111. The surface of the first base portion 2011 facing the third base portion 2013 includes a second recessed surface 20117 and a third side surface 20116. The surface of the first base portion 2011 facing the fourth base portion 2014 includes a third recessed surface 20115 and a second side surface 20112. The surface of the first base portion 2011 facing the fifth base portion 2015 includes a fourth recessed surface 20119 and a fourth side surface 20118.

[0259] In the example shown in 2009, when the support plate base 1300 is in the unfolded state, the included angle θ4 between the first side surface 20111 and the first recessed surface 20114 can take the value: 0° < θ4 < 180°. Similarly, when the support plate base 1300 is in the unfolded state, the included angle between the second side surface 20112 and the third recessed surface 20115 can be greater than 0° and less than 180°, the included angle between the third side surface 20116 and the second recessed surface 20117 can be greater than 0° and less than 180°, and the included angle between the fourth side surface 20118 and the fourth recessed surface 20119 can be greater than 0° and less than 180°.

[0260] In one example, the regions of the first base portion 2011 facing the second base portion 2012, the second base portion 2012, the regions of the first base portion 2011 facing the third base portion 2013, and the third base portion 2013 can correspond to the first support portion 131 of the foldable support plate 130. The regions of the first base portion 2011 facing the fourth base portion 2014, the fourth base portion 2014, the regions of the first base portion 2011 facing the fifth base portion 2015, and the fifth base portion 2015 can correspond to the second support portion 132 of the foldable support plate 130. The remaining regions of the first base portion 2011 can correspond to the first transition support portion 134, the second transition support portion 135, the third transition support portion 136, the fourth transition support portion 137, and the foldable support portion 133 of the foldable support plate 130.

[0261] In another example, the regions of the first base portion 2011 facing the second base portion 2012, the second base portion 2012, the regions of the first base portion 2011 facing the third base portion 2013, and the third base portion 2013 can correspond to the first support portion 131 and the first transition support portion 134 of the foldable support plate 130. The regions of the first base portion 2011 facing the fourth base portion 2014, the fourth base portion 2014, the regions of the first base portion 2011 facing the fifth base portion 2015, and the fifth base portion 2015 can correspond to the second support portion 132 and the second transition support portion 135 of the foldable support plate 130. The remaining regions of the first base portion 2011 can correspond to the foldable support portion 133, the third transition support portion 136, and the fourth transition support portion 137 of the foldable support plate 130.

[0262] In another example, the regions of the first base portion 2011 facing the second base portion 2012, the second base portion 2012, the regions of the first base portion 2011 facing the third base portion 2013, and the third base portion 2013 can correspond to the first transition support portion 134, the third transition support portion 136, and the first support portion 131 of the foldable support plate 130. The regions of the first base portion 2011 facing the fourth base portion 2014, the fourth base portion 2014, the regions of the first base portion 2011 facing the fifth base portion 2015, and the fifth base portion 2015 can correspond to the second transition support portion 135, the fourth transition support portion 137, and the second support portion 132 of the foldable support plate 130. The remaining regions of the first base portion 2011 can correspond to the foldable support portion 133 of the foldable support plate 130.

[0263] The material of the first base portion 2011 is different from that of the second base portion 2012. The materials of the second base portion 2012, the third base portion 2013, the fourth base portion 2014, and the fifth base portion 2015 can be the same or different. The material properties of the second base portion 2012, the fourth base portion 2014, the third base portion 2013, and the fifth base portion 2015 can be similar or slightly different. In one possible example, the strength or stiffness of the first base portion 2011 can be higher than that of the second base portion 2012, the third base portion 2013, the fourth base portion 2014, and the fifth base portion 2015. For example, the material of the first base portion 2011 is titanium or a titanium alloy, while the materials of the second base portion 2012, the third base portion 2013, the fourth base portion 2014, and the fifth base portion 2015 are all aluminum alloys or copper alloys.

[0264] along Figure 21Observing 2004 in the Y direction as shown, we can obtain the following: Figure 22 A view of the support plate base 1300 shown below. (See below in conjunction with...) Figure 21 , Figure 22 This paper describes several possible interfaces between two adjacent base portions. For ease of description, the interface between the first base portion 2011 and the second base portion 2012 will be used as an example. The interface between the first base portion 2011 and the third base portion 2013 can have similar shape features.

[0265] like Figure 22 As shown in 2101, the interface between two adjacent substrate portions can be, for example, a plane. In the example shown in 2101, this plane can refer to a surface where surface roughness is negligible. That is, the unevenness introduced by surface roughness can be ignored. Figure 22 The bonding strength of the interface shown in 2101 mainly depends on the adhesive (such as solder, glue, solid film, etc.) between the two adjacent substrate parts.

[0266] like Figure 22 As shown in 2102 to 2108, the surface of the first substrate portion 2011 facing the second substrate portion 2012 may include a plurality of first interface protrusions and a plurality of first interface grooves. The surface of the second substrate portion 2012 facing the first substrate portion 2011 may include a plurality of second protrusions and a plurality of second grooves. The first interface protrusions may engage with the second grooves, and the first interface grooves may engage with the second protrusions. Figure 22 Compared to the interface shown in 2101, the interaction between the protrusions and grooves improves the bonding strength between adjacent substrate portions. The protrusions and grooves can be fabricated, for example, using chemical etching.

[0267] like Figure 22 As shown in 2102, the first interface protrusion and the second protrusion can both be conical protrusions, and the first interface groove and the second groove can both be conical grooves.

[0268] like Figure 22 As shown in 2103, both the first interface protrusion and the second protrusion can be square strip protrusions, and both the first interface groove and the second groove can be square strip grooves.

[0269] like Figure 22 As shown in 2104, the first interface protrusion and the second protrusion can both be trapezoidal protrusions, and the first interface groove and the second groove can both be trapezoidal grooves.

[0270] like Figure 22As shown in 2105, the first interface protrusion can be an arc-shaped protrusion, and the second protrusion can be a square-shaped protrusion. The first interface groove can be a square-shaped groove, and the second groove can be an arc-shaped groove.

[0271] like Figure 22 As shown in 2106, both the first interface protrusion and the second protrusion can be arc-shaped protrusions, and both the first interface groove and the second groove can be arc-shaped grooves.

[0272] like Figure 22 As shown in 2107, the first interface protrusion can be an arc-shaped protrusion, and the second protrusion can be a dovetail-shaped protrusion. The first interface groove can be a dovetail-shaped groove, and the second groove can be an arc-shaped groove.

[0273] like Figure 22 As shown in 2108, both the first interface protrusion and the second protrusion can be dovetail-shaped protrusions, and both the first interface groove and the second groove can be dovetail-shaped grooves.

[0274] Using a combination of arc-shaped protrusions and arc-shaped grooves helps reduce stress concentration at the interface under external forces. A larger contact area between the protrusion and the groove increases the bonding force at the interface. For example, the bonding force of an interface using dovetail-shaped protrusions and dovetail-shaped grooves is slightly greater than that of an interface using square protrusions and square grooves, and the bonding force of an interface using square protrusions and square grooves is slightly greater than that of an interface using conical protrusions and conical grooves.

[0275] By employing a first substrate portion 2011 with high yield strength and high toughness, and a second substrate portion 2012 with high thermal conductivity or low density, through lamination, splicing, overlapping, and embedding composite processes, the requirements for lightweight, high thermal conductivity, high modulus, low impedance, high bonding strength, and salt spray resistance of the support plate substrate 1300 can be specifically met, thereby facilitating the fulfillment of diverse needs for the foldable support plate 130. Furthermore, the support plate substrate 1300 provided in this application embodiment helps reduce the weight of the foldable support plate 130. For example, for a foldable electronic device 100 including an 8-inch flexible display screen 110, the weight of the foldable support plate 130 can be approximately 12-13g.

[0276] like Figure 18 , Figure 19 As shown, the foldable support plate 130 may include a groove structure. The groove structure may be, for example, any one of a through groove 1331 or a blind groove 1332. Figure 18 In the example shown, multiple through slots 1331 can be provided on the foldable support portion 133, the first transition support portion 134, and the second transition support portion 135 of the foldable support plate 130. Figure 19, Figure 20 In the example shown, multiple through slots 1331 can be provided on the foldable support portion 133 of the foldable support plate 130, and multiple blind slots 1332 can be provided on both the first transition support portion 134 and the second transition support portion 135. When the thickness of the foldable support plate 130 is relatively large, the slot structure helps to improve the bending performance of the foldable support plate 130, so that the foldable support plate 130 can provide relatively good support performance for the flexible display screen 110 and also have a relatively high bending life.

[0277] like Figure 20 As shown, the foldable support plate 130 may include multiple through slots 1331 and multiple blind slots 1332. Through slots 1331 may be disposed in the foldable support portion 133 of the foldable support plate 130. Blind slots 1332 may be disposed in the first transition support portion 134 or the second transition support portion 135 of the foldable support plate 130. When the foldable support portion 133 is in a bent state, the degree of bending of the foldable support portion 133 is relatively large; therefore, providing through slots 1331 helps to reduce the bending stress of the foldable support portion 133. When the foldable support portion 133 is in a bent state, the first transition support portion 134 and the second transition support portion 135 are slightly bent, and the amount of bending is relatively small. Distributing blind slots 1332 at positions with relatively small bending amounts can balance the bending performance and support performance of the flexible screen module 200. The foldable support portion 133 is in a bent state, which means that the foldable support portion 133 is folded. The first support portion 131 and the second support portion 132 are arranged parallel to each other, spaced apart from each other, and face to face, with the spacing between the first support portion 131 and the second support portion 132 reaching a minimum. Different groove structures are provided in multiple areas of the foldable support plate 130, which is beneficial for flexibly adjusting the bending performance and compression resistance of multiple areas of the foldable support plate 130. Figures 23A-23D It shows Figure 20 The CC view in [the context]. For example... Figures 23A-23D As shown, the through groove 1331 can penetrate the support plate base 1300 of the foldable support plate 130. The blind groove 1332 may not penetrate the support plate base 1300 of the foldable support plate 130. The groove depth of the blind groove 1332 can be less than the thickness of the support plate base 1300. The width L4 of the blind groove 1332 can be greater than the maximum width of the through groove 1331.

[0278] The through-slot 1331 and the blind slot 1332 can be processed, for example, by chemical etching. Because the width of the blind slot 1332 is relatively larger, the etching rate of the blind slot 1332 is relatively fast. When the blind slot 1332 is etched to a specified depth (e.g., half the thickness of the support substrate 1300), the through-slot 1331 has not yet been etched through. Therefore, etching needs to continue on the other side of the support substrate 1300 to form the through-slot 1331.

[0279] For example, a first etching in the area where the through groove 1331 is located can produce a blind groove to be processed; a second etching on the other side of the area where the through groove 1331 is located can produce the through groove 1331. The depth of the blind groove to be processed is not necessarily half the thickness of the support plate substrate 1300.

[0280] Figures 23A-23D Several possible cross-sectional structures of the through groove 1331 are shown. The through groove 1331 may include a first groove 13311 and a second groove 13312, and the first groove 13311 and the second groove 13312 may communicate with each other. As can be seen from the above, the first groove 13311 may be formed, for example, during the first etching process, and the second groove 13312 may be formed, for example, during the second etching process. Figures 23A-23D As shown, the thickness of the support plate substrate 1300 can be, for example, T, and the depth of the first groove 13311 can be, for example, T. 1X ,like Figures 23A-23D T in 1a ~T 1d The depth of the second groove 13312 can be, for example, T. 2X ,like Figures 23A-23D T in 2a ~T 2d , where T = T 1X +T 2X .

[0281] The first groove 13311 can be located on the same side of the support plate base 1300 as the blind groove 1332. A first port 13313 of the through groove 13311 can be formed on the side of the first groove 13311 away from the second groove 13312, and a second port 13314 of the through groove 13312 can be formed on the side of the second groove 13312 away from the first groove 13311. The first port 13313 can be located on the same side of the support plate base 1300 as the opening of the blind groove 1332. That is, the opening direction of the first port 13313 can be the same as the opening direction of the blind groove 1332.

[0282] The width of the boundary profile between the first groove 13311 and the second groove 13312 can be W1. In one example, the width of the first port 13313 can be greater than the width W1 of the boundary profile, and the difference between the width of the first port 13313 and the width W1 of the boundary profile can be W1. 2X ,like Figures 23A-23D W in 2a ~W 2d Similarly, the width of the second port 13314 can be greater than the width W1 of the boundary profile, and the difference between the width of the second port 13314 and the width W1 of the boundary profile can be W. 3X,like Figures 23A-23D W in 3a ~W 3d .

[0283] If located Figure 23A , Figure 23C As shown, W 2X It can be less than W 3X W 3X With W 2X The difference can be greater than the preset width difference (e.g., 0–0.1 mm). W 2X For example, it can be less than or equal to 0.05T. W 3X For example, it can be 0.05T to 0.2T. Additionally, the depth T of the first groove 13311... 1X The depth T can be less than that of the second groove 13312. 2X T 1X With T 2X The difference can be greater than the preset depth difference (e.g., 0 to 0.02 mm).

[0284] If located Figure 23B , Figure 23D As shown, W 2X It can be equal to or approximately equal to W 3X W 3X With W 2X The absolute value of the difference can be less than the preset width difference. W 2X For example, it can be 0.05T to 0.2T. W 3X For example, it can be 0.05T to 0.2T. Additionally, the depth T of the first groove 13311... 1X It can be equal to or approximately equal to the depth T of the second groove 13312 2X T 1X With T 2X The absolute value of the difference can be less than the preset depth difference.

[0285] Figures 23A-23D θ 5a ~θ 5d The angle θ between the groove wall of the first groove 13311 and the first end face 1333 of the support plate base 1300 at the first port 13313 is shown. 5X The first end face 1333 can be the end face where the first port 13313 is located. The first end face 1333 can represent the tangible interface of the support plate substrate 1300. Figures 23A-23D θ 6a ~θ 6d The angle θ between the groove wall of the second groove 13312 at the second port 13314 and the second end face 1334 of the support plate base 1300 is shown. 6XThe second end face 1334 can be the end face where the second port 13314 is located. The second end face 1334 can represent the tangible interface of the support plate substrate 1300.

[0286] like Figures 23A-23B As shown, θ 5a θ 5b It can be an acute angle, θ 6a θ 6b It can be an acute angle, i.e., θ. 5x It can be greater than 0° and less than 90°, θ 6X It can be greater than 0° and less than 90°.

[0287] like Figures 23C-23D As shown, θ 5c θ 5d It can be an obtuse angle, θ 6c θ 6d It can be an obtuse angle, i.e., θ. 5X It can be greater than 90° and less than 180°, θ 6X It can be greater than 90° and less than 180°.

[0288] By adjusting the lateral erosion width of the through groove 1331 (as shown in W above) 2X W 3X The angle between the inner wall of the through groove 1331 and the end face of the support plate substrate at the port can be adjusted (as described above, θ). 5X θ 6X In one example, a through-groove structure can be etched first on the foldable substrate 1300, and then the sidewalls of the groove structure can be etched a second or multiple times to adjust the sidewall structure of the through-groove 1331. The side etching width of the through-groove 1331 can be adjusted by adjusting etching parameters such as etching time, etching speed, and etching reagent ratio.

[0289] The lateral erosion width of the through groove 1331 is relatively large (e.g., ratio W). 2X / T 1X Or ratio W 3X / T 2X When the lateral etching width of the through groove 1331 is relatively large, the angle between the inner wall of the through groove 1331 at the port and the end face of the support plate substrate can be adjusted to tend towards an obtuse angle; when the lateral etching width of the through groove 1331 is relatively small (e.g., ratio W), 2X / T 1X Or ratio W 3X / T 2X In the case of a relatively small angle, the angle between the inner wall of the through groove 1331 at the port and the end face of the support plate substrate can be adjusted to tend towards an acute angle.

[0290] Combination Figure 23A , Figure 23C , Figure 23E The included angle θ is shown. 5X θ 6X Impact on the lifespan of the foldable support plate 130. In one example, one side of the foldable support 133 is bonded to the flexible display screen 110 via an adhesive layer 161, and the other side of the foldable support 133 can be provided with a filler material 162, such as polyurethane (PU) Mylar. This filler material 162 can be filled between the foldable support 133 and other components (such as the door panel of the hinge mechanism 125). This filler material 162 can, for example, be used to prevent dust from the hinge mechanism 125 from contacting the foldable support plate 130. The adhesive layer 161 and the filler material 162 may partially extend into the through groove 1331. During the process of the foldable support 133 changing from a flat state to a bent state, the adhesive layer 161 may retract inward, and the filler material 162 may be pulled outward. That is, the adhesive layer 161 extending into the through groove 1331 has a tendency to deform and flow into the through groove 1331 (e.g., Figure 23E As shown by the dashed arrow in the image, the filling material 162 has a tendency to deform and flow outwards from the through groove 1331 (e.g., Figure 23E (As shown by the dashed arrow in the diagram). During the process of the foldable support 133 changing from a bent state to a flat state, the adhesive layer 161 can be pulled outward, and the filling material 162 can be retracted inward. That is, the adhesive layer 161 extending into the through groove 1331 has a tendency to deform and flow out of the through groove 1331, and the filling material 162 extending into the through groove 1331 has a tendency to deform and flow into the through groove 1331. After multiple folds, the port of the through groove 1331 may have a tendency to cut the adhesive layer 161 and the filling material 162. By setting θ 5X θ 6X The obtuse angle helps to reduce the force of the port of the through groove 1331 touching the adhesive layer 161 and the filling material 162, thereby helping to extend the service life of the foldable electronic device 100.

[0291] along Figures 23A-23D Observing the support plate base 1300 in the Z direction as shown by the dashed line, we can obtain the following: Figure 24 The diagram shows a schematic structure of a through-slot port. Figure 24 The through-slot port shown can be either the first port 13313 or the second port 13314 of the through-slot 1331.

[0292] like Figure 24 As shown, the shape of the through-slot port can be dumbbell-shaped. The port shape of the through-slot 1331 may include a first end opening 13315, a second end opening 13316, and a strip opening 13317 connecting the first end and the second end.

[0293] like Figure 24As shown, the width L2 of the first end opening 13315 can be greater than the width L3 of the strip opening 13317. Both the width L2 of the first end opening 13315 and the width L3 of the strip opening 13317 can be greater than a preset width value. For example, L2 can be approximately 0.12 mm, L3 can be approximately 0.19–0.2 mm, and the preset width value can be, for example, greater than 0 and less than 0.07 mm. In this embodiment, the extension direction of the strip opening 13317 or the through-slot port can correspond to the length direction of the opening, and the width direction of the opening can correspond to the direction perpendicular to the length direction of the opening. The width of the opening can refer to the dimension of the opening in the width direction. Optionally, the first end opening 13315 and the strip opening 13317 can be connected by a rounded arc or a rounded corner.

[0294] Similarly, the width of the second end opening 13316 can be greater than the width L3 of the strip opening 13317. Optionally, the second end opening 13316 and the strip opening 13317 can be connected by an arc transition.

[0295] like Figure 24 As shown, the side of the first end opening 13315 away from the strip opening 13317 has a first arc, the diameter of which 2*r2 can be greater than the width L3 of the strip opening 13317. Similarly, the side of the second end opening 13316 away from the strip opening 13317 has a second arc, the diameter of which can be greater than the width L3 of the strip opening 13317.

[0296] A larger end opening width helps reduce the external force required to bend the foldable support 133. Furthermore, a larger end opening width allows for a larger area to distribute bending stress, thus reducing the tendency for stress concentration. For example, compared to an example with an end opening width of 0.12 mm, the bending yield stress of the foldable support 133 can be reduced by 130 MPa in an example with an end opening width of 0.19 mm. Figure 25 The bending stress contour map of the dumbbell-shaped through groove 1331 is shown. It can be seen that the grayscale distribution of the contour map is uniform, and there is no obvious stress concentration area. That is to say, the bending stress peak value of the foldable support 133 is relatively small.

[0297] like Figure 24 As shown, the width L3 of the strip opening 13317 can be less than the thickness T of the support plate base 1300 as shown in FIG. 23. The width L3 of the strip opening 13317 can be, for example, about 70% to 90% of the thickness of the support plate base 1300, such as L3 being about 80% of the thickness of the support plate base 1300.

[0298] A smaller width of the strip opening 13317 is beneficial for improving the compression resistance of the foldable support plate 130 in the foldable support portion 133. For example, compared to an example where the width of the strip opening 13317 is 0.2 mm, in an example where the width of the strip opening 13317 is 0.12 mm, the compression resistance of the foldable support portion 133 can be increased by 1.5 kg. To improve the compression resistance of the foldable support portion 133, the length ratio of the strip opening 13317 to the port shape of the through groove 1331 can be greater than a preset ratio, for example, 0.6 to 0.99. Optionally, this preset ratio can be, for example, 0.7 to 0.95. That is, the ratio of the first end opening 13315 or the second end opening 13316 to the total length of the through groove port can be 0.005 to 0.2, such as 0.025 to 0.15, for example, 0.1.

[0299] The following defines two adjacent through slots 1331A and 1331B, wherein the first ends of through slot 1331A and the first ends of through slot 1331B face each other, and the second ends of through slot 1331A and the second ends of through slot 1331B face away from each other. The region between the first end of through slot 1331A and the second end of through slot 1331B is defined as a solid region. Since the length of the strip opening 13317 can be relatively long, the ratio of the length of this solid region to the length of through slot 1331A or through slot 1331B can be relatively small. This is beneficial for improving the bendability of the foldable support 133, for reducing the bending stress of the first end opening 13315 and the second end opening 13316, and thus for reducing the stress concentration of the first end opening 13315 and the second end opening 13316. With a fixed ratio between the length of the solid region and the length of the slot 1331, if the absolute length of the solid region is small, its support effect on the flexible display screen 110 is relatively poor, which is detrimental to the compression resistance of the foldable support portion 133; conversely, if the absolute length of the solid region is long, its support effect on the flexible display screen 110 is relatively good, which is beneficial to improving the compression resistance of the foldable support portion 133. The ratio between the length of the solid region and the length of the slot 1331 can, for example, be less than 0.1.

[0300] By reasonably adjusting the shape of the through slot port, it is beneficial to coordinate the bending performance and compression resistance of the foldable support plate 130, which in turn helps to extend the bending life of the foldable support plate 130 and the foldable electronic device 100, for example, the bending life can exceed 200,000 times.

[0301] Figures 26 to 28 The arrangement of multiple through slots 1331 on the foldable support plate 130 is shown. It should be understood that the embodiments of this application are not intended to limit the specific arrangement of the multiple through slots 1331.

[0302] exist Figures 26 to 28 In the example shown, the multiple through slots 1331 may include multiple such Figure 24 The first type of through groove 13318 (i.e., dumbbell-shaped through groove 1331) is shown. These multiple first type through grooves 13318 can be arranged parallel to each other at intervals. Optionally, two adjacent through grooves 1331 along the width direction of the through groove 1331 can be staggered. Optionally, two adjacent through grooves 1331 along the length direction of the through groove 1331 can be collinear and aligned.

[0303] exist Figure 27 , Figure 28 In the example shown, the plurality of through slots 1331 may further include a second type of through slot 13319 with a shape different from the first type of through slot 13318. The second type of through slot 13319 may, for example, be a racetrack-shaped through slot 1331. The plurality of first type through slots 13318 and the plurality of second type through slots 13319 may be arranged parallel to each other at intervals. Optionally, as... Figure 27 , 27 As shown, two adjacent through slots 1331 along the length of the through slot 1331 can be respectively a first type of through slot 13318 and a second type of through slot 13319. Optionally, as... Figure 27 As shown, the shapes of two adjacent through slots 1331 along the width direction of the through slot 1331 can be the same. Optionally, as... Figure 28 As shown, the shapes of two adjacent through slots 1331 along the width direction of the through slot 1331 can be different.

[0304] Combination Figure 20 , Figure 29 The foldable support plate 130 may include one or more partial plating layers 138. The partial plating layers 138 may act as pins of the foldable support plate 130. The shape of the partial plating layers 138 may be, for example, circular, square, rectangular, polygonal, elliptical, etc., and this application embodiment is not intended to limit the specific shape of the partial plating layers 138. The partial plating layers 138 may, for example, be disposed on the first support portion 131 or the second support portion 132. Figure 19 , Figure 20 In the example shown, the partial coating 138 and the flexible display screen 110 can be located on opposite sides of the support plate substrate 1300. That is, in the foldable electronic device 100, the partial coating 138 can face or be close to the housing of the foldable electronic device 100, i.e., away from or away from the flexible display screen 110, and is disposed on one side of the first support portion 131 or the second support portion 132.

[0305] Figure 21 In the examples 2001–2009 shown, the support plate substrate 1300 can be a single-phase material or a multi-phase material. In one example, combined with… Figure 21As shown in 2002 and 2008, the area of ​​the support plate substrate 1300 with the partial plating 138 can be the aforementioned first substrate portion 2011; in another example, combined with Figure 21 In the examples 2002, 2003, 2004, 2005, 2006, 2007, 2008, and 2009 shown, the area of ​​the support plate substrate 1300 with the partial plating 138 can be the aforementioned second substrate portion 2012; in yet another example, combined with Figure 21 As shown in 2003, 2004, 2005, 2008, and 2009, the area of ​​the support plate substrate 1300 with the partial plating layer 138 can be the aforementioned third substrate portion 2013.

[0306] Figure 29 It shows Figure 20 DD view in the middle. For example Figure 29 As shown, in one example, the local coating 138 includes, for example, a nickel plating layer 1381, a nickel sulfamate plating layer 1382, and a gold plating layer 1383 stacked together, with the nickel sulfamate plating layer 1382 connected between the nickel plating layer 1381 and the gold plating layer 1383. The nickel plating layer 1381, nickel sulfamate plating layer 1382, and gold plating layer 1383 can be obtained, for example, by electroplating. The local coating 138 can be a composite coating. In other examples, the gold plating layer 1383 can be replaced with other plating layers, such as a rhodium-ruthenium plating layer, a silver plating layer, etc. The width d1 of the local coating 138 can be, for example, less than 2 mm, such as d1 < 0.16 mm. The larger the size of the local coating 138, the easier it is for a protrusion to appear on the back of the support substrate 1300, and the easier it is for the user to observe the film on the off flexible display screen.

[0307] Optional, such as Figure 29 As shown, the support plate substrate 1300 may further include a third groove 1392. The third groove 1392 may be disposed on both sides of the support plate substrate 1300 opposite to the partial plating layer 138.

[0308] Optionally, the support plate substrate 1300 may further include a fourth groove 1391. A partial plating layer 138 may be disposed within the fourth groove 1391. The fourth groove 1391 and the third groove 1392 may be located on the upper and lower surfaces of the support plate substrate 1300, respectively. The width d2 of the third groove 1392 may, for example, be greater than the width d1 of the fourth groove 1391.

[0309] The fourth groove 1391 and the third groove 1392 can be arranged opposite to each other. Assume the fourth groove 1391 is located on the first surface of the support plate substrate 1300, and the third groove 1392 is located on the second surface of the support plate substrate 1300. The projection area of ​​the fourth groove 1391 on the first surface can be a first projection area, and the projection area of ​​the electroplating groove on the first surface can be a second projection area. The overlap ratio between the first projection area and the second projection area is greater than a preset overlap ratio. For example, the preset overlap ratio can be 50% to 100%.

[0310] When the support plate base 1300 is in the unfolded state, the groove depth L1 of the third groove 1392 can be less than 0.01 mm, for example, less than 0.005 mm. Therefore, when the support plate base 1300 is in the folded state, it is less likely that a protrusion will appear on the second surface, or the height of the protrusion will be lower, for example, the height of the protrusion can be less than 0.01 mm.

[0311] like Figure 30 As shown in the outline diagram, providing a partial coating 138 on the support substrate 1300, or removing the oxide layer only at the location where the partial coating 138 is provided, may introduce additional stress changes. This could cause a protrusion to form on the second surface of the support substrate 1300 at the location corresponding to the partial coating 138, which in turn could affect the flatness of the flexible display screen 110. Before removing the oxide layer, the tensile stress introduced by the oxide layer on the first and second surfaces of the support substrate 1300 cancels each other out. After removing the oxide layer at the location where the partial coating 138 is provided on the first surface, the second surface of the support substrate 1300 has a relatively large tensile stress. Therefore, a protrusion may form on the second surface of the support substrate 1300 at the location corresponding to the partial coating 138. Furthermore, the partial coating 138 on the first surface can introduce tensile stress, increasing the degree of protrusion on the second surface at the location corresponding to the partial coating 138. Therefore, a third groove 1392 can be provided on the second surface. On the one hand, machining the third groove 1392 can remove part of the oxide layer on the second surface, and the residual tensile stress on the second surface can be reduced; on the other hand, machining the third groove 1392 is also beneficial to counteract the protruding deformation caused by the local plating layer 138.

[0312] The groove depth L1 of the third groove 1392 can be related to the thickness of the local coating 138. The greater the thickness of the local coating 138, the greater the groove depth L1 of the third groove 1392 can be. In one example, the ratio of the groove depth L1 of the third groove 1392 to the thickness of the local coating 138 can be, for example, 0.2 to 0.7, such as 0.25 to 0.5. For example, if the thickness of the local coating 138 is 5 μm, the groove depth L1 of the third groove 1392 is 2 μm; or if the thickness of the local coating 138 is 10 μm, the groove depth L1 of the third groove 1392 is 3 to 4 μm.

[0313] Figure 30 The diagram shows the protrusion data on the second surface without the third groove 1392 being machined, with the protrusion reaching a maximum of 0.008 to 0.012 mm. In a dark screen state, the user may be able to observe the protrusion on the second surface through the flexible display screen 110. Figure 31 The data on the protrusions are shown when the third groove 1392 is machined on the second surface. The protrusions can reach a maximum of 0.003 to 0.007 mm.

[0314] In addition, the groove depth L1 of the third groove 1392 can be greater than Figure 30 The maximum protrusion height shown is slightly smaller because the protrusion itself is a gradient protrusion, while etching easily removes material uniformly. To avoid machining sharp corners or tapered grooves on the second surface, the groove depth L1 of the third groove 1392 can be smaller than... Figure 30 The maximum protrusion height shown is slightly smaller.

[0315] In summary, machining the third groove 1392 on the second surface helps to balance the internal stress of the support plate substrate 1300, thereby improving the flatness of the second surface and the flatness of the flexible display screen 110.

[0316] The following describes a processing technology for a partial coating 138 provided in an embodiment of this application.

[0317] First, the sliced ​​support plate substrate 1300 is subjected to pressure holding annealing.

[0318] For example, before the slicing process, the raw material of the support plate can be processed by hot rolling, cold rolling, etc., and the internal stress of the raw material of the support plate may be relatively large. The annealing process can reduce the internal stress of the support plate substrate 1300.

[0319] Then, ink is applied to the areas where the local coating 138 does not need to be applied, and the areas are exposed and developed.

[0320] In other words, the areas where the local coating 138 is not required are covered. The ink can be, for example, epoxy resin.

[0321] Subsequently, the support plate substrate 1300 is etched to form the fourth groove 1391 and the third groove 1392.

[0322] For example, after annealing, an oxide layer can easily form on the surface of the support substrate 1300. Directly applying a localized plating layer 138 onto this oxide layer may reduce the adhesion between the localized plating layer 138 and the support substrate 1300. Etching can remove the oxide from the surface of the support substrate 1300. This oxide removal process can also be referred to as a surface activation process.

[0323] To improve the surface roughness of the support plate substrate 1300, the support plate substrate 1300 can be surface-activated multiple times. For example, in the first surface activation process, a mixed acid containing hydrofluoric acid HF can be used to roughly remove the material from the first and second surfaces, and form a surface roughness such as... Figure 29 The third groove 1392 shown; in the second surface activation process, a mixed acid containing nitric acid (HNO3) can be used to remove the material from the first surface with medium precision; the material from the first surface is further removed by degreasing electrolysis; the material from the first surface is further removed by low-concentration hydrofluoric acid (HF), and a layer is formed on the second surface as shown. Figure 29 The fourth groove 1391 is shown.

[0324] Then, a nickel plating layer 1381 is electroplated in the fourth groove 1391, a nickel sulfonate plating layer 1382 is electroplated on the surface of the nickel plating layer 1381 away from the support plate substrate 1300, and a gold plating layer 1383 is electroplated on the surface of the nickel sulfonate plating layer 1382 away from the support plate substrate 1300.

[0325] The nickel plating 1381 can be used to strengthen the bond between the support plate substrate 1300 and the nickel sulfamate plating 1382. The internal stress of the nickel sulfamate plating 1382 is generally relatively small, which is beneficial to improving the mechanical stability of the local plating 138. The gold plating 1383 has good conductivity and wear resistance. Due to the good conductivity of the gold plating 1383, the impedance of the local plating 138 is relatively small (for example, it can be reduced to 0.1 to 0.2 ohms), and the pressure required for the spring to abut against the local plating 138 can be relatively small. Therefore, the deformation of the substrate 1300 near the local plating 138 can be relatively small, which is beneficial to improving the flatness of the flexible display screen 110. Furthermore, reducing the impedance is also beneficial to reducing the RSE value of the foldable electronic device 100. In addition, due to the good wear resistance of the gold plating 1383, the slight shaking between the spring and the gold plating 1383 is less likely to generate powder, which is beneficial to improving the stability of the local plating 138.

[0326] Next, the ink on the surface of the support plate substrate 1300 is removed, and the support plate substrate 1300 is vacuum-baked at medium temperature.

[0327] Vacuum baking at medium temperature helps increase the covalent bond strength between the support plate substrate 1300 and the local coating 138. For example, the bonding strength between the local coating 138 and the support plate substrate 1300 is at least 400 squares (B). That is, in the coating bonding strength test, the proportion of the composite coating shown in 28 that is torn off is less than 5%.

[0328] As mentioned above, the following can be obtained: Figure 20 The foldable support plate 130 is shown. Then, refer to... Figure 8The example shown illustrates how bonding the foldable support plate 130 to the flexible display screen 110 using polyurethane (PU) foam can achieve the following result: Figure 19 The flexible screen module 200 is shown. Then, Figure 19 The flexible screen module 200 shown is assembled with the housing of the foldable electronic device 100 to obtain, as shown in the figure. Figures 1 to 3 The foldable electronic device 100 shown.

[0329] Figure 32 This is a schematic structural diagram of another flexible screen module 200 provided in an embodiment of this application. Figure 19 The flexible screen module 200 shown is different. Figure 32 The flexible screen module 200 shown can be folded outwards.

[0330] The flexible screen module 200 may include a flexible display screen 110 and a foldable support plate 130. The flexible display screen 110 may include a first display section 111, a second display section 112, and a foldable display section 113, with the foldable display section 113 connected between the first display section 111 and the second display section 112. The foldable support plate 130 may include a first support section 131, a second support section 132, and a foldable support section 133, with the foldable support section 133 connected between the first support section 131 and the second support section 132. Using adhesive layers (such as foam, mesh adhesive, etc.), the first support section 131 can be correspondingly attached to the first display section 111, the second support section 132 can be correspondingly attached to the second display section 112, and the foldable support section 133 can be correspondingly attached to the foldable display section 113.

[0331] In one example, the flexible screen module 200 may further include a metal layer 150, which may be located between the flexible display screen 110 and the foldable support plate 130. For example, the metal layer 150 may be attached to the first support portion 131, the second support portion 132, and the foldable support portion 133 of the foldable support plate 130; the flexible display screen 110 may be attached to the metal layer 150 via an adhesive layer. Alternatively, the metal layer 150 may be attached to the first display portion 111, the second display portion 112, and the foldable display portion 113 of the flexible display screen 110; the foldable support plate 130 may be attached to the metal layer 150 via an adhesive layer.

[0332] The thickness of the metal layer 150 is, for example, 0.01–0.08 mm, such as 0.02–0.05 mm. The material strength of the metal layer 150 can be relatively high. The material of the metal layer 150 can be, for example, high-strength stainless steel (e.g., SUS301-EH), or high-strength titanium and titanium alloys (e.g., TA4 / TC4), or high-strength nickel-titanium shape memory alloy (Ni-Ti), etc.

[0333] and Figures 19 to 31 The example shown is similar. Figure 32 The foldable support plate 130 shown may include, for example: Figures 20 to 22 The support plate base 1300 shown is as follows: Figure 19 Figure 23 to Figure 28 The aforementioned through slot 1331 and as Figures 29 to 31 The partial plating layer 138 is shown. The support plate substrate 1300 can correspond to the first support portion 131, the second support portion 132, and the foldable support portion 133 of the foldable support plate 130; a through groove 1331 can be provided in the foldable support portion 133; and the partial plating layer 138 can be provided in the first support portion 131 and the second support portion 132. For a detailed description of the foldable support plate 130, please refer to... Figures 19 to 31 The examples shown will not be elaborated upon further here.

[0334] This application's embodiments, through various design schemes for the foldable support plate 130, are beneficial for improving the mechanical properties, electrical connectivity, and radio frequency performance of the foldable support plate 130. They also help improve the flatness of the flexible display screen 110, and reduce the weight and extend the lifespan of the foldable electronic device 100. In other words, while reducing the weight of the foldable electronic device 100, the solutions provided in this application's embodiments also help improve the overall performance of the foldable electronic device 100.

[0335] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A foldable support plate (130), characterized in that, The foldable support plate (130) is used to cover the flexible display screen (110), and the material of the foldable support plate (130) includes carbon fiber. The foldable support plate (130) comprises: The foldable support part (133) is in a bent state when the foldable support plate (130) is in a folded state, and the foldable support part (133) is provided with multiple through slots (1331). The first support part (131) and the second support part (132) are located on both sides of the foldable support part (133). When the foldable support plate (130) is in a folded state, the first support part (131) and the second support part (132) are respectively in a flat state. A first transition support (134) and a second transition support (135) are provided. The first transition support (134) is connected between the first support (131) and the foldable support (133), and the second transition support (135) is connected between the second support (132) and the foldable support (133). When the foldable support plate (130) is in a folded state, the bending arc of the first transition support (134) and the bending arc of the second transition support (135) are smaller than the bending arc of the foldable support (133). Multiple groove structures are provided on the first transition support (134) and the second transition support (135). A partial coating (138) is disposed on the side of the foldable support plate (130) opposite to the flexible display screen (110).

2. The foldable support plate (130) according to claim 1, characterized in that, The partial plating (138) comprises nickel and silver.

3. The foldable support plate (130) according to claim 1 or 2, characterized in that, The partial plating (138) includes a nickel plating and a silver plating layer stacked together, wherein the silver plating is disposed on the side of the nickel plating away from the foldable support plate (130).

4. The foldable support plate (130) according to claim 3, characterized in that, The nickel-containing plating layer includes a nickel plating layer (1381) and a nickel aminosulfonate plating layer (1382) stacked together, wherein the nickel aminosulfonate plating layer (1382) is disposed between the nickel plating layer (1381) and the silver plating layer.

5. The foldable support plate (130) according to claim 3 or 4, characterized in that, The nickel-containing plating layer and the silver plating layer are obtained by electroplating.

6. The foldable support plate (130) according to claim 1 or 2, characterized in that, The groove structure is a blind groove (1332) or a through groove (1331).

7. The foldable support plate (130) according to claim 1, characterized in that, The through groove (1331) of the foldable support part (133) includes a first groove (13311) and a second groove (13312) that are connected. The first groove (13311) and the blind groove (1332) of the first transition support part (134) are located on the same side of the foldable support part (133). The depth of the first groove (13311) is less than the depth of the second groove (13312).

8. The foldable support plate (130) according to claim 1 or 2, characterized in that, The through groove (1331) of the foldable support part (133) includes a first groove (13311), the first groove (13311) forms a first port (13313) on the first end face (1333) of the foldable support part (133), and at the first port (13313), the included angle between the groove wall of the first groove (13311) and the first end face (1333) is an obtuse angle.

9. The foldable support plate (130) according to claim 1 or 2, characterized in that, The port shape of the through groove (1331) includes a first end opening (13315), a second end opening (13316), and a strip opening (13317). The strip opening (13317) is connected between the first end opening (13315) and the second end opening (13316). The width of the first end opening (13315) and the width of the second end opening (13316) are both greater than the width of the strip opening (13317). The ratio of the length of the strip opening (13317) to the length of the through groove (1331) is greater than a preset ratio.

10. The foldable support plate (130) according to claim 1 or 2, characterized in that, The foldable support plate (130) also includes a third groove (1392), and the partial plating layer (138) is disposed opposite to the third groove (1392) on both sides of the foldable support plate (130).

11. The foldable support plate (130) according to claim 10, characterized in that, The ratio of the groove depth of the third groove (1392) to the thickness of the local coating (138) is 0.2 to 0.

7.

12. The foldable support plate (130) according to claim 10, characterized in that, The width of the third groove (1392) is greater than the width of the partial coating (138).

13. The foldable support plate (130) according to claim 10, characterized in that, The width of the local coating (138) is less than 2 mm.

14. The foldable support plate (130) according to claim 10, characterized in that, The foldable support plate (130) further includes a fourth groove (1391), which is disposed opposite to the third groove (1392) on both sides of the foldable support plate (130), and the partial plating layer (138) is disposed in the fourth groove (1391).

15. The foldable support plate (130) according to claim 1 or 2, characterized in that, The foldable support plate (130) includes a support plate base (1300), which is used to form the first support portion (131), the foldable support portion (133), and the first transition support portion (134). The support plate base (1300) includes: A first substrate portion (2011) and a second substrate portion (2012) are stacked together. The stiffness of the first substrate portion (2011) is greater than that of the second substrate portion (2012), and the thickness of the first substrate portion (2011) is greater than that of the second substrate portion (2012).

16. The foldable support plate (130) according to claim 15, characterized in that, The partial coating (138) is disposed on the first substrate portion (2011) or the second substrate portion (2012).

17. The foldable support plate (130) according to claim 15, characterized in that, The support plate base (1300) also includes: The third base portion (2013) and the second base portion (2012) are located on opposite sides of the first base portion (2011), the stiffness of the first base portion (2011) is greater than that of the third base portion (2013), and the thickness of the first base portion (2011) is greater than that of the third base portion (2013).

18. The foldable support plate (130) according to claim 17, characterized in that, The partial coating (138) is disposed on the second substrate portion (2012) or the third substrate portion (2013).

19. The foldable support plate (130) according to claim 1 or 2, characterized in that, The foldable support plate (130) includes a support plate base (1300), which is used to form the first support portion (131), the foldable support portion (133), and the first transition support portion (134). The support plate base (1300) includes: The first base portion (2011) and the second base portion (2012) correspond to different regions of the foldable support plate (130). The first base portion (2011) is used to form at least the foldable support portion (133), and the second base portion (2012) is used to form at least the first support portion (131). The stiffness of the first base portion (2011) is greater than the stiffness of the second base portion (2012).

20. The foldable support plate (130) according to claim 19, characterized in that, The partial coating (138) is disposed on the second substrate portion (2012) or the third substrate portion (2013).

21. The foldable support plate (130) according to claim 19, characterized in that, The surface of the first base portion (2011) facing the second base portion (2012) is a first side surface (20111). The exposed surface of the first base portion (2011) includes a first end face (20113). The first side surface (20111) is provided with a first protrusion and a first groove. The second base portion (2012) includes a second groove that matches the first protrusion and a second protrusion that matches the first groove. When the foldable support plate (130) is in the unfolded state, the first side surface (20111) is perpendicular to the first end face (20113).

22. The foldable support plate (130) according to claim 19, characterized in that, The surface of the first base portion (2011) facing the second base portion (2012) is the first side surface (20111), and the exposed surface of the first base portion (20111) is the first end surface (20113). When the foldable support plate (130) is in the unfolded state, the included angle between the first side surface (20111) and the first end surface (20113) is greater than 0° and less than 90°.

23. The foldable support plate (130) according to claim 19, characterized in that, The second base portion (2012) includes a base groove, and the first base portion (2011) is received within the base groove.

24. The foldable support plate (130) according to claim 23, characterized in that, The surface of the first base portion (2011) facing the second base portion (2012) includes a first side surface (20111) and a first end surface (20113). When the foldable support plate (130) is in the unfolded state, the included angle between the first side surface (20111) and the first end surface (20113) is greater than 0° and less than 90°.

25. The foldable support plate (130) according to claim 1 or 2, characterized in that, The foldable support plate (130) includes a support plate base (1300), which is used to form the first support portion (131), the foldable support portion (133), and the first transition support portion (134). The support plate base (1300) includes: A first base portion (2011) is used to form the first support portion (131), the foldable support portion (133), and the first transition support portion (134). The first base portion (2011) also includes a first recessed platform. The second base portion (2012) is disposed on the first sinking platform and is used at least to form the first support portion (131).

26. The foldable support plate (130) according to claim 25, characterized in that, The surface of the first base portion (2011) facing the second base portion (2012) includes a first recessed surface (20114) and a first side surface (20111). When the foldable support plate (130) is in the unfolded state, the included angle between the first side surface (20111) and the first recessed surface (20114) is greater than 0° and less than 180°.

27. The foldable support plate (130) according to claim 25 or 26, characterized in that, The first base portion (2011) further includes a second sinking platform, which is located at the same end of the first base portion (2011) and on both sides of the first base portion (2011). The sinking directions of the first sinking platform and the second sinking platform are opposite. The support plate base (1300) further includes: A third base portion (2013) is disposed on the second sinking platform, and the third base portion (2013) is at least used to form the first support portion (131).

28. The foldable support plate (130) according to claim 1 or 2, characterized in that, The foldable support plate (130) also includes: A third transition support (136) is connected between the first transition support (134) and the foldable support (133) when the foldable support plate (130) is in the folded state. The third transition support (136) is in a flat state, or, The third transition support (136) is in a bent state. The bending arc of the third transition support (136) is smaller than that of the first transition support (134) and smaller than that of the foldable support (133).

29. A flexible screen module, characterized in that, The flexible screen module includes a flexible display screen (110) and a foldable support plate (130) as described in any one of claims 1 to 28, wherein the flexible display screen (110) is attached to the foldable support plate (130).

30. A foldable electronic device, characterized in that, The foldable electronic device includes a flexible display screen (110) and a foldable support plate (130) as claimed in any one of claims 1 to 28, wherein the flexible display screen (110) is attached to the foldable support plate (130).

31. The electronic device according to claim 30, characterized in that, The side of the partial plating (138) facing away from or away from the foldable support plate (130) is used for grounding.

32. The electronic device according to claim 31, characterized in that, The electronic device also includes a mid-frame, which is provided with an electrical connector, and the partial plating (138) is grounded through the electrical connector.

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