Rotating shaft apparatus and folding screen device

Abstract

A rotating shaft apparatus (50) and a folding screen device (10). The rotating shaft apparatus (50) comprises a shaft seat (60), a first rotating assembly (80), and a second rotating assembly (90). The shaft seat (60) comprises a bearing plane (61). The first rotating assembly (80) comprises a first swing arm assembly, a first adapter panel (83), and a first door panel (81), which are movably connected to the shaft seat (60). The first swing arm assembly is movably connected to the first adapter panel (83). The first door panel (81) is movably connected to the first adapter panel (83). The first door panel (81) is movably connected to the first swing arm assembly. The first door panel (81) comprises a first supporting plane (811). The second rotating assembly (90) comprises a second swing arm assembly, a second adapter panel (93) and a second door panel (91), which are movably connected to the shaft seat (60). The second swing arm assembly is movably connected to the second adapter panel (93). The second door panel (91) is movably connected to the second adapter panel (93). The second door panel (91) is movably connected to the second swing arm assembly. The second door panel (91) comprises a second supporting plane (911). When the rotating shaft apparatus (50) is in a folded state, an included angle M1 between the first supporting plane (811) and the bearing plane (61) is less than an included angle M2 between the second supporting plane (911) and the bearing plane (61).

Description

Hinge device and folding screen device Technical Field

[0001] The embodiments of the present application relate to the field of terminal technology, and in particular to a hinge device and a folding screen device. Background Art

[0002] With the explosive growth of electronic devices, their functionality is increasing. The displays of electronic devices are used to present visual information to users. In some scenarios, users desire a larger display area. Currently, electronic devices typically have single-screen displays. A larger display area means larger electronic devices, which reduces their portability.

[0003] To balance the size and display area of ​​electronic devices, they can adopt a foldable structure. For example, two shell components can rotate relative to each other around a hinge mechanism to unfold or fold. A flexible display screen covers the two shell components. When the two shell components are unfolded to the same plane, the flexible display screen is in an unfolded state, providing a larger display area. When the two shell components are folded together, the flexible display screen is in a folded state, and the electronic device has a smaller size. However, current electronic devices with foldable structures are still relatively thick when folded, which affects the user experience.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a hinge device and a folding screen device, which are conducive to the thinning design of the folding screen device while ensuring that the overall mechanical strength of the hinge assembly meets the design requirements.

[0006] Embodiments of the present application provide a hinge device. The hinge device is used in a foldable screen device. The foldable screen device includes a flexible display screen. The hinge device includes a shaft seat, a first rotating assembly, and a second rotating assembly.

[0007] A first rotating assembly and a second rotating assembly are respectively provided on either side of the shaft seat. The shaft seat includes a bearing plane. The bearing plane is used to support a portion of the flexible display screen. The first rotating assembly includes a first swing arm assembly, a first adapter plate, and a first door panel. The first swing arm assembly is movably connected to the shaft seat. The first swing arm assembly is movably connected to the first adapter plate. The first door panel is movably connected to the first adapter plate. The first door panel is movably connected to the first swing arm assembly. The first door panel includes a first supporting plane. The first supporting plane is used to support a portion of the flexible display screen. The second rotating assembly includes a second swing arm assembly, a second adapter plate, and a second door panel. The second swing arm assembly is movably connected to the shaft seat. The second swing arm assembly is movably connected to the second adapter plate. The second door panel is movably connected to the second adapter plate. The second door panel is movably connected to the second swing arm assembly. The second door panel includes a second supporting plane. The second supporting plane is used to support a portion of the flexible display screen.

[0008] The first swing arm assembly, the first adapter plate and the first door panel rotate relative to the axle seat, and the second swing arm assembly, the second adapter plate and the second door panel rotate relative to the axle seat, so that when the pivot device is in a folded state, the angle M1 between the first support plane and the load-bearing plane is an acute angle, and the angle M2 between the second support plane and the load-bearing plane is an acute angle, and M1 is smaller than M2.

[0009] When the hinge device of the embodiment of the present application is in the folded state, the shaft seat, the first rotating assembly and the second rotating assembly form a screen space for accommodating the first bendable section and the second bendable section of the flexible display screen. The first rotating assembly and the second rotating assembly in the hinge device are asymmetrically arranged so that when the hinge device is in the folded state, the spatial positions of the first door panel and the second door panel are different, so that the first door panel and the second door panel are in an asymmetrical state, and the angle M1 between the first support plane and the load-bearing plane is not equal to the angle M2 between the second support plane and the load-bearing plane. Since the first rotating assembly and the second rotating assembly are in an asymmetrical state, the screen space formed by the shaft seat, the first rotating assembly and the second rotating assembly is also asymmetrical. The asymmetrical arrangement of the first rotating assembly and the second rotating assembly of the hinge device allows the first rotating assembly and the second rotating assembly to simultaneously utilize the avoidance space of the two shell components. Therefore, the structural design of the hinge device of the embodiment of the present application can make the thickness of the shell components on both sides designed to be different, so as to reduce the overall thickness of the folding screen device in the folded state. When the shell members on either side of the hinge assembly have different thicknesses, the volumes of the escape spaces in the shell members on either side of the hinge assembly differ. When the hinge assembly is in the folded state, the first and second rotating assemblies can be offset toward the relatively larger escape space, thereby preventing the first and second rotating assemblies from being reduced in size due to reducing the thickness of the shell member on one side. This helps to eliminate the limitation of the relatively small escape space in the size design of the first and second rotating assemblies, thereby achieving a thinner design for the folding screen device while ensuring that the overall mechanical strength of the first and second rotating assemblies meets the design requirements.

[0010] In some achievable embodiments, the first door panel is rotatably connected to the first adapter plate. The second door panel is rotatably connected to the second adapter plate. When the hinge assembly is in a folded state, a vertical distance between the rotation axis of the first door panel relative to the first adapter plate and the load-bearing plane is greater than a vertical distance between the rotation axis of the second door panel relative to the second adapter plate and the load-bearing plane.

[0011] By adjusting the position of the rotation axis of the first door panel and the rotation axis of the second door panel, when the rotation axis device is in the folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensure that the connection method and assembly method between the first door panel and the first adapter plate or between the second door panel and the second adapter plate do not change. The size of the arc guide hole and the arc connecting part (for example, the radius of the arc guide hole and the radius of the arc connecting part) can be changed to ensure that the position of the first support plane and the second support plane are different, which is beneficial to reduce the structural design complexity of the first door panel and the first adapter plate, or reduce the structural design complexity of the second door panel and the second adapter plate.

[0012] In some embodiments, the axle seat has a center plane. The load-bearing plane is perpendicular to the center plane. The first swing arm assembly includes a first auxiliary swing arm. The second swing arm assembly includes a second auxiliary swing arm. The first auxiliary swing arm and the second auxiliary swing arm are respectively rotatably connected to the axle seat.

[0013] The vertical distance between the rotation axis of the first auxiliary swing arm relative to the shaft seat and the center plane is F11, and the vertical distance between the rotation axis of the second auxiliary swing arm relative to the shaft seat and the center plane is F21, wherein F11 is greater than F21.

[0014] By adjusting the positions of the rotation axis of the first auxiliary swing arm and the rotation axis of the second auxiliary swing arm, when the rotating shaft device is in a folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensuring that the connection method and assembly method between the first auxiliary swing arm and the axle seat or between the second auxiliary swing arm and the axle seat do not change. By changing the connection position of the first auxiliary swing arm and the axle seat or the connection position of the second auxiliary swing arm and the axle seat, the position of the first support plane and the second support plane can be ensured to be different, which is beneficial to reducing the complexity of the structural design of the first auxiliary swing arm and the axle seat, or reducing the complexity of the structural design of the second auxiliary swing arm and the axle seat.

[0015] In some achievable embodiments, the axle seat has a center plane. The load-bearing plane is perpendicular to the center plane. The first swing arm assembly further includes a first main swing arm. The second swing arm assembly further includes a second main swing arm. The first main swing arm and the second main swing arm are respectively rotatably connected to the axle seat. The vertical distance between the rotation axis of the first main swing arm relative to the axle seat and the center plane is H11, and the vertical distance between the rotation axis of the second main swing arm relative to the axle seat and the center plane is H21, where H11 is greater than H21.

[0016] By adjusting the positions of the rotation axis of the first main swing arm and the rotation axis of the second main swing arm, when the rotating shaft device is in a folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensuring that the connection method and assembly method between the first main swing arm and the axle seat or between the second main swing arm and the axle seat do not change. By changing the connection position of the first main swing arm and the axle seat or the connection position of the second main swing arm and the axle seat, the position of the first support plane and the second support plane can be ensured to be different, which is beneficial to reducing the complexity of the structural design of the first main swing arm and the axle seat, or reducing the complexity of the structural design of the second main swing arm and the axle seat.

[0017] In some possible implementations, the first main swing arm is rotationally connected to the first adapter plate. The second main swing arm is rotationally connected to the second adapter plate. When the hinge assembly is in the deployed state, the vertical distance between the rotation axis of the first main swing arm relative to the first adapter plate and the load-bearing plane is G1, and the vertical distance between the rotation axis of the second main swing arm relative to the second adapter plate and the load-bearing plane is G2, where G1 is greater than G2.

[0018] In this embodiment of the present application, the shell component corresponding to the first main swing arm is thicker than the shell component corresponding to the second main swing arm. Along the thickness direction of the shell component, the shell component corresponding to the first main swing arm has an inner wall surface facing the first main swing arm. When the hinge assembly is in the deployed state, the connection point between the first main swing arm and the first adapter plate is relatively close to the inner wall surface of the shell component, thereby effectively utilizing the clearance space of the shell component for the first main swing arm and the first adapter plate.

[0019] In some possible implementations, the first main swing arm is rotatably connected to the first adapter plate. The second main swing arm is rotatably connected to the second adapter plate. When the hinge assembly is in the deployed state, the vertical distance between the rotation axis of the first main swing arm relative to the first adapter plate and the center plane is G11, while the vertical distance between the rotation axis of the second main swing arm relative to the second adapter plate and the center plane is G21, where G11 is greater than G21.

[0020] By adjusting the positions of the rotation axis of the first main swing arm and the rotation axis of the second main swing arm, when the rotating shaft device is in a folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensure that the connection method and assembly method between the first main swing arm and the first adapter plate or between the second main swing arm and the second adapter plate do not change, so as to ensure that the position of the first support plane and the position of the second support plane are different, which is beneficial to reduce the structural design complexity of the first main swing arm and the first adapter plate, or reduce the structural design complexity of the second main swing arm and the second adapter plate.

[0021] In some achievable embodiments, the first main swing arm is slidably connected to the first door panel, and the second main swing arm is slidably connected to the second door panel.

[0022] In some embodiments, the first main swing arm and the second main swing arm each include a shaft. The first door panel and the second door panel each include a guide slot. The shaft of the first main swing arm slidably engages with the guide slot of the first door panel. The shaft of the second main swing arm slidably engages with the guide slot of the second door panel.

[0023] When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the shaft body of the first main swing arm and the load plane is Q1, and the vertical distance between the rotation axis of the shaft body of the second main swing arm and the load plane is Q2, where Q1 is greater than Q2.

[0024] By adjusting the position of the axis of the first main swing arm and the position of the axis of the second main swing arm, when the rotating shaft device is in the folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensure that the connection method and assembly method between the first main swing arm and the first door panel or between the second main swing arm and the second door panel do not change, so as to ensure that the position of the first support plane and the position of the second support plane are different, which is beneficial to reduce the complexity of the structural design of the first main swing arm and the first door panel, or reduce the complexity of the structural design of the second main swing arm and the second door panel.

[0025] In some possible implementations, the first main swing arm and the second main swing arm both include a shaft. The first door panel and the second door panel are both provided with a guide groove. The shaft of the first main swing arm slides in conjunction with the guide groove of the first door panel. The shaft of the second main swing arm slides in conjunction with the guide groove of the second door panel.

[0026] When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the shaft body of the first main swing arm and the center plane is Q11, and the vertical distance between the rotation axis of the shaft body of the second main swing arm and the center plane is Q21, where Q11 is greater than Q21.

[0027] By adjusting the position of the axis of the first main swing arm and the position of the axis of the second main swing arm, when the rotating shaft device is in the folded state, the angle M1 between the first support plane and the load-bearing plane is smaller than the angle M2 between the second support plane and the load-bearing plane. This is beneficial to ensure that the connection method and assembly method between the first main swing arm and the first door panel or between the second main swing arm and the second door panel do not change, so as to ensure that the position of the first support plane and the position of the second support plane are different, which is beneficial to reduce the complexity of the structural design of the first main swing arm and the first door panel, or reduce the complexity of the structural design of the second main swing arm and the second door panel.

[0028] In some embodied embodiments, the first swing arm assembly further includes a first main swing arm. The first main swing arm is rotationally connected to the axle seat. The first main swing arm is rotationally connected to the first adapter plate. The second swing arm assembly further includes a second main swing arm. The second main swing arm is rotationally connected to the axle seat. The second main swing arm is rotationally connected to the second adapter plate. When the pivot device switches between the deployed state and the folded state, the rotation angle of the first main swing arm relative to the axle seat is greater than the rotation angle of the second main swing arm relative to the axle seat.

[0029] In some achievable embodiments, the first swing arm assembly includes a first auxiliary swing arm and a first main swing arm. The second swing arm assembly includes a second auxiliary swing arm and a second main swing arm. The first auxiliary swing arm and the second auxiliary swing arm are respectively rotatably connected to the axle seat. The first auxiliary swing arm is slidably connected to the first adapter plate. The second auxiliary swing arm is slidably connected to the second adapter plate. The first main swing arm and the second main swing arm are respectively rotatably connected to the axle seat. The rotation axis of the first auxiliary swing arm relative to the axle seat does not coincide with the rotation axis of the first main swing arm relative to the axle seat. The rotation axis of the second auxiliary swing arm relative to the axle seat does not coincide with the rotation axis of the second main swing arm relative to the axle seat.

[0030] In some achievable embodiments, the first swing arm assembly includes a first auxiliary swing arm, the second swing arm assembly includes a second auxiliary swing arm, the first auxiliary swing arm is slidably connected to the first door panel, and the second auxiliary swing arm is slidably connected to the second door panel.

[0031] In some embodiments, the first auxiliary swing arm and the second auxiliary swing arm each include a shaft. The first door panel and the second door panel each include a guide slot. The shaft of the first auxiliary swing arm slidably engages with the guide slot of the first door panel. The shaft of the second auxiliary swing arm slidably engages with the guide slot of the second door panel.

[0032] In some possible implementations, the first swing arm assembly includes a first auxiliary swing arm. The second swing arm assembly includes a second auxiliary swing arm. The first auxiliary swing arm and the second auxiliary swing arm are each rotatably connected to the axle seat. When the rotating shaft assembly is in an expanded state, the distance between the rotation axis of the first auxiliary swing arm relative to the axle seat and the bearing plane is F1, and the distance between the rotation axis of the second auxiliary swing arm relative to the axle seat and the bearing plane is F2, where F1 is equal to F2.

[0033] An embodiment of the present application provides a folding screen device, which includes a hinge device and a shell component.

[0034] Shell components are respectively arranged on both sides of the shaft seat. The shell components on both sides of the shaft seat are respectively connected to the first adapter plate and the second adapter plate.

[0035] In some possible implementations, the thickness of the shell component connected to the first riser plate is greater than the thickness of the shell component connected to the second riser plate.

[0036] In some possible implementations, the foldable screen device further includes a flexible display screen. The flexible display screen includes a first connecting segment, a first bendable segment, a second bendable segment, and a second connecting segment, which are sequentially arranged. The first connecting segment and the second connecting segment are respectively connected to the shell components on both sides of the hinge assembly.

[0037] In which, the rotating shaft device is used to drive the first bendable section and the second bendable section to switch between the unfolded state and the folded state. When the flexible display screen is in the folded state, the first bendable section and the second bendable section are arranged asymmetrically. The first bendable section includes a first inner bend portion, a first transition portion, and a first outer bend portion distributed in sequence. The first outer bend portion is connected to the first connecting section. The first support plane supports the first transition portion. The first inner bend portion is arranged near the shaft seat. The second bendable section includes a second inner bend portion, a second transition portion, and a second outer bend portion distributed in sequence. The second inner bend portion is arranged near the shaft seat. The first inner bend portion is connected to the second inner bend portion. The second support plane supports the second transition portion. The second outer bend portion is connected to the second connecting section.

[0038] In some feasible embodiments, when the flexible display screen is in a folded state, the angle between the light-emitting surface of the first transition portion and the light-emitting surface of the first connecting segment is A1, and the angle between the light-emitting surface of the second transition portion and the light-emitting surface of the second connecting segment is A2, wherein A1 is greater than A2.

[0039] In some feasible embodiments, when the flexible display screen is in a folded state, the vertical distance between the bending axis of the first inner bend portion and the light-emitting surface of the first connecting segment is B1, and the vertical distance between the bending axis of the first inner bend portion and the light-emitting surface of the second connecting segment is B2, where B1 is equal to B2.

[0040] In some feasible embodiments, when the flexible display screen is in a folded state, the vertical distance between the bending axis of the first inner bend portion and the light-emitting surface of the first connecting segment is B1, and the vertical distance between the bending axis of the first inner bend portion and the light-emitting surface of the second connecting segment is B2, wherein B1 is smaller than B2.

[0041] In some possible implementations, when the flexible display screen is in a folded state, the radius of the first inwardly curved portion is equal to the radius of the second inwardly curved portion.

[0042] In some possible implementations, the foldable screen device further includes a metal support backplate. The metal support backplate is located on the backlight side of the flexible display. The metal support backplate includes a first region and a second region. The first region is provided corresponding to the first outer curved portion. The second region is provided corresponding to the second outer curved portion. The first and second regions have first and second grooves, respectively, on surfaces facing the shell component.

[0043] When the metal support backboard is in the unfolded state, the metal support backboard has a center line. The minimum vertical distance between the first area and the center line is J1, and the minimum vertical distance between the second area and the center line is J2, wherein J1 is greater than J2.

[0044] In some possible implementations, the width of the first region is greater than the width of the second region, the number of the first slots is greater than the number of the second slots, and the width of the first slots is smaller than the width of the second slots.

[0045] In some implementations, the metal support back plate includes a third region and a fourth region. The third region is provided corresponding to the first inner curvature. The fourth region is provided corresponding to the second inner curvature. The third region and the fourth region are provided with a first hollow hole and a second hollow hole, respectively.

[0046] The minimum vertical distance between the third area and the center line is L1, and the minimum vertical distance between the fourth area and the center line is L2, wherein L1 is greater than L2.

[0047] In some possible implementations, the width of the third region is greater than the width of the fourth region. The number of the first hollow holes is greater than the number of the second hollow holes, and the aperture of the first hollow holes is smaller than the aperture of the second hollow holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic structural diagram of a foldable screen device in an unfolded state provided by an embodiment of the present application;

[0049] FIG2 is a schematic structural diagram of an intermediate state of a folding process of a folding screen device provided by an embodiment of the present application;

[0050] FIG3 is a schematic structural diagram of a folding screen device in a folded state provided by an embodiment of the present application;

[0051] FIG4 is a schematic diagram of a partially exploded structure of a foldable screen device in an unfolded state provided by an embodiment of the present application;

[0052] FIG5 is a schematic diagram of a partial structure of a flexible display screen in a folded state provided by an embodiment of the present application;

[0053] FIG6 is a schematic diagram of a partial cross-sectional structure of a folding screen device in a folded state in the related art;

[0054] FIG7 is a schematic diagram of a partial structure of a rotating shaft device in an expanded state provided by an embodiment of the present application;

[0055] FIG8 is a schematic diagram of a partially exploded structure of a rotating shaft device provided in one embodiment of the present application;

[0056] FIG9 is a schematic diagram of a partial cross-sectional structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0057] FIG10 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0058] FIG11 is a schematic diagram of a partial cross-sectional structure of a folding screen device in an unfolded state provided by an embodiment of the present application;

[0059] FIG12 is a schematic diagram of a partial cross-sectional structure of a folding screen device in an unfolded state provided by an embodiment of the present application;

[0060] FIG13 is a partial cross-sectional structural diagram of a rotating shaft device in a folded state provided by an embodiment of the present application;

[0061] FIG14 is a partial cross-sectional structural diagram of a rotating shaft device in an expanded state provided by an embodiment of the present application;

[0062] FIG15 is a partial cross-sectional structural diagram of a rotating shaft device in a folded state provided by an embodiment of the present application;

[0063] FIG16 is a schematic diagram of a partial cross-sectional structure of a folding screen device in an unfolded state provided by an embodiment of the present application;

[0064] FIG17 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0065] FIG18 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0066] FIG19 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0067] FIG20 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0068] FIG21 is a schematic diagram of a partial structure of a rotating shaft device in a folded state provided by an embodiment of the present application;

[0069] FIG22 is a schematic diagram of a partial structure of a folding screen device in a folded state provided by an embodiment of the present application;

[0070] FIG23 is a schematic partial cross-sectional view of the rotating shaft device in an expanded state provided by an embodiment of the present application;

[0071] FIG24 is a schematic diagram of a partial cross-sectional structure of a folding screen device in an unfolded state provided by an embodiment of the present application;

[0072] FIG25 is a partial cross-sectional structural diagram of a rotating shaft device in an expanded state provided by an embodiment of the present application;

[0073] FIG26 is a partial cross-sectional structural diagram of the first main swing arm and the second main swing arm during the rotation process according to an embodiment of the present application;

[0074] FIG27 is a schematic diagram of a partial cross-sectional structure of a flexible display screen and a metal support back plate in a folded state provided by an embodiment of the present application;

[0075] FIG28 is a schematic diagram of a partial structure of a metal support back plate in an expanded state provided by an embodiment of the present application;

[0076] Figure 29 is a schematic diagram of the partial structure of the folding screen device provided in an embodiment of the present application in a folded state.

[0077] FIGURES: 10, foldable screen device; 20, housing assembly; 30, flexible display screen; 30a, light-emitting surface 30a; 30b, backlight surface; 31, first connecting section; 32, first bendable section; 321, first inner curvature; 322, first transition portion; 323, first outer curvature; 33, second bendable section; 331, second inner curvature; 332, second transition portion; 333, second outer curvature; 34, second connecting section; 40, housing component; 40a, avoidance space; 50, rotating shaft device; 60, shaft seat; 60a, first arc-shaped groove; 60b, second arc-shaped groove; 61, bearing plane; 70, shaft cover; 80, first rotating assembly; 81, first door panel; 811, first supporting surface; 82, first auxiliary swing arm; 83, first adapter plate; 84. First main swing arm; 841. First arc block; 90. Second rotating assembly; 91. Second door panel; 911. Second supporting surface; 92. Second auxiliary swing arm; 93. Second adapter plate; 94. Second main swing arm; 941. Second arc block; 100. Main board; 110. Battery; 120. Slide groove; 130. Slider; 140. Guide groove; 150. Axle; 160. Arc guide hole; 170. Arc connecting part; 180. Metal support back plate; 181. First slot; 182. Second slot; 183. First hollow hole; 184. Second hollow hole; 180a. First area; 180b. Second area; 180c. Third area; 180d. Fourth area; 190. External display screen; 200. Rotating assembly; Z, thickness direction. DETAILED DESCRIPTION

[0078] The electronic device in the embodiments of the present application may be referred to as user equipment (UE) or terminal, etc. For example, the electronic device may be a tablet computer (portable Android device, PAD), a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, and other mobile terminals or fixed terminals. In the embodiments of the present application, the form of the terminal device is not specifically limited.

[0079] In the embodiments of the present application, the electronic device is a handheld device with wireless communication function. The handheld device with wireless communication function can be, for example, a foldable screen device. The foldable screen device can be a foldable mobile phone including a foldable flexible display screen.

[0080] Figure 1 schematically shows the structure of the foldable screen device 10 in the unfolded state. Figure 2 schematically shows the structure of the foldable screen device 10 in an intermediate state during the folding process. Figure 3 schematically shows the structure of the foldable screen device 10 in the folded state. Figure 4 schematically shows the partially exploded structure of the foldable screen device 10 in the unfolded state.

[0081] 1 to 4 , the folding screen device 10 of the embodiment of the present application includes a shell assembly 20 and a flexible display screen 30. The shell assembly 20 includes a shell component 40 and a hinge device 50. Shell components 40 are respectively provided on both sides of the hinge device 50. When the shell components 40 on both sides of the hinge device 50 rotate, the shell components 40 can switch between a folded state and an unfolded state. When the shell components 40 on both sides of the hinge device 50 are stacked on each other, the shell components 40 on both sides are in a folded state. When the shell components 40 on both sides move away from each other from the stacked state and unfold, the shell components 40 on both sides are in an unfolded state. The process of the shell components 40 on both sides from the folded state to the unfolded state is an unfolding process, and the process of the shell components 40 from the unfolded state to the folded state is a folding process. Therefore, when the shell assembly 20 switches between the folded state and the unfolded state, the flexible display screen 30 can switch between the unfolded state and the folded state synchronously.

[0082] The flexible display screen 30 can be arranged on the shell assembly 20. The flexible display screen 30 can serve as the inner display of the foldable screen device 10. As shown in Figure 4, the flexible display screen 30 includes a first connecting section 31, a first bendable section 32, a second bendable section 33 and a second connecting section 34 distributed in sequence. The first connecting section 31 and the second connecting section 34 are respectively connected to the shell components 40 on both sides of the hinge device 50. The first bendable section 32 and the second bendable section 33 are both arranged corresponding to the hinge device 50. The first bendable section 32 and the second bendable section 33 of the flexible display screen 30 can be folded after being subjected to external force. The hinge device 50 is used to drive the first bendable section 32 and the second bendable section 33 of the flexible display screen 30 to bend and deform, so that the first bendable section 32 and the second bendable section 33 can be folded.

[0083] Figure 5 schematically illustrates the partial structure of the flexible display screen 30 in its folded state. As shown in Figure 5, when the flexible display screen 30 is in the folded state, the first bendable section 32 and the second bendable section 33 bend and deform, while the first connecting section 31 faces the second connecting section 34. The light-emitting surface of the first connecting section 31 can be parallel to the light-emitting surface of the second connecting section 34. The first bendable section 32 includes a first inner curved portion 321, a first transition portion 322, and a first outer curved portion 323, which are arranged in sequence. The first outer curved portion 323 is connected to the first connecting section 31. For example, the first inner curved portion 321 and the first outer curved portion 323 can both be arc-shaped. The first transition portion 322 can be flat. The first inner curved portion 321 is positioned near the hinge assembly 50. The second bendable section 33 includes a second inner curved portion 331, a second transition portion 332, and a second outer curved portion 333, which are arranged in sequence. The second inner curved portion 331 is positioned near the hinge assembly 50. The first inner curved portion 321 is connected to the second inner curved portion 331. The second outer curved portion 333 is connected to the second connecting section 34. The second inner curved portion 331 and the second outer curved portion 333 can both be arc-shaped. The second transition portion 332 can be flat.

[0084] When the shell members 40 on either side of the hinge assembly 50 are folded, the flexible display 30 is folded and positioned between the hinge assembly 50 and the shell member 40. When the shell members 40 on either side of the hinge assembly 50 are unfolded, the flexible display 30 can be relatively flat. When the flexible display 30 is unfolded, the entire display 30 exhibits excellent flatness.

[0085] The flexible display screen 30 has a light emitting surface 30a. The light emitting surface 30a of the flexible display screen 30 can be used to display corresponding image information. The folding screen device 10 can change its overall size by folding or unfolding, and can also have a larger display area in the unfolded state. In some usage scenarios of the folding screen device 10, for example, when the folding screen device 10 is in a carrying state, the folding screen device 10 is usually in a folded state, so that the overall thickness of the folding screen device 10 in the folded state has a great impact on the convenience and experience of the use process.

[0086] As shown in Figure 4, the folding screen device 10 may also include a mainboard 100 and components. The components are arranged on the mainboard 100. For example, the mainboard 100 may be a printed circuit board (PCB). The components may be connected to the mainboard 100 by processes such as welding. The components include but are not limited to a central processing unit (CPU), an intelligent algorithm chip or a power management chip (PMIC). The flexible display 30 may be electrically connected to the mainboard 100.

[0087] As shown in Figure 4, the foldable screen device 10 also includes a battery 110. The battery 110 can be electrically connected to the mainboard 100. The battery 110 can be used to provide power to the flexible display 30 or other components. For example, the battery 110 can be a lithium-ion battery, such as a lithium iron phosphate battery. For example, the battery 110 can be disposed within at least one of the shell components 40 on both sides of the hinge device 50.

[0088] In the related art, Figure 6 schematically shows a partial cross-sectional structure of the folding screen device 10 in a folded state. In the folding screen device 10 of the related art, the hinge device 50 includes an axle seat 60, a rotating assembly 200 and a shell component 40. The rotating assembly 200 is rotatably connected to the axle seat 60. The shell component 40 is connected to the rotating assembly 200. The shell components 40 on both sides of the axle seat 60 have the same thickness. The shell component 40 includes an avoidance space 40a. The avoidance spaces 40a of the shell components 40 on both sides of the hinge device 50 are of the same volume. The rotating assembly 200 is located in the avoidance space 40a. When the folding screen device 10 is in a folded state, the bendable section of the flexible display screen 30 is a symmetrical structure relative to the center plane P1 of the axle seat 60. For example, the bendable section of the flexible display screen 30 can form a water drop shape that is symmetrical relative to the center plane P1 of the axle seat 60. Currently, to ensure that the bendable section of the flexible display 30 forms a symmetrical teardrop shape, the rotating assemblies 200 on either side of the shaft base 60 need to be symmetrically arranged relative to the center plane P1 of the shaft base 60. For a foldable screen device 10 including symmetrically arranged rotating assemblies 200, a method for achieving a thinner and lighter foldable screen device 10 is to simultaneously reduce the thickness of the shell components 40 on both sides of the shaft base 60. The shell components 40 on both sides of the shaft base 60 have the same thickness. However, simultaneously reducing the thickness of the shell components 40 on both sides of the shaft base 60 will result in a reduction in the volume of the escape space 40a of the shell components 40 on both sides. The size of the symmetrically arranged rotating assemblies 200 is limited by the volume of the escape space 40a. When the volume of the escape space 40a of the shell components 40 on both sides is reduced, the size of the rotating assemblies 200 must also be reduced accordingly to ensure that the symmetrically arranged rotating assemblies 200 can fit into the escape space 40a of the shell components 40 on both sides. However, when the size of the rotating assembly 200 is reduced, the mechanical strength of the rotating assembly 200 is affected. Therefore, the symmetrical design of the hinge device 50 restricts the lightweight and thin design of the folding screen device 10.

[0089] The hinge device 50 provided in the embodiment of the present application is applied to the folding screen device 10. The rotating component in the hinge device 50 is an asymmetric structure, so that the avoidance space of the two shell parts 40 can be used to reasonably design the structure of the hinge component, which is conducive to removing the limitation of the size of the rotating component by the smaller avoidance space, so that the thickness of the folding screen device 10 can be reduced while ensuring that the overall mechanical strength of the hinge assembly meets the design requirements.

[0090] The following further describes the possible implementation methods provided by the embodiments of the present application.

[0091] Figure 7 schematically shows a partial structure of the hinge device 50 in the unfolded state. Figure 8 schematically shows a partial exploded structure of the hinge device 50. Figure 9 schematically shows a partial cross-sectional structure of the folding screen device 10 in the folded state. Figure 10 schematically shows a partial structure of the folding screen device 10 in the folded state.

[0092] As shown in Figures 7 to 10, in the embodiment of the present application, the hinge device 50 includes a shaft base 60, a first rotating assembly 80, and a second rotating assembly 90. The first rotating assembly 80 and the second rotating assembly 90 are respectively disposed on either side of the shaft base 60. The shaft base 60 includes a bearing surface 61. The bearing surface 61 of the shaft base 60 is used to support the bendable section of the flexible display 30. The bendable section may include a first bendable section 32 and a second bendable section 33. For example, when the flexible display 30 is in the unfolded state, the bearing surface 61 of the shaft base 60 can support the bendable section of the flexible display 30, thereby reducing the possibility of the bendable section becoming concave and deformed.

[0093] The first rotating assembly 80 and the second rotating assembly 90 are respectively used to correspond to the first bendable section 32 and the second bendable section 33 of the flexible display screen 30. During the process of switching the folding screen device 10 from the unfolded state to the folded state, the first rotating assembly 80 and the second rotating assembly 90 can rotate relative to the shaft seat. The first rotating assembly 80 and the second rotating assembly 90 can rotate toward each other to switch from the unfolded state to the folded state. The first rotating assembly 80 and the second rotating assembly 90 can rotate away from each other to switch from the folded state to the unfolded state. The first rotating assembly 80 and the second rotating assembly 90 can move according to a predetermined trajectory, and the first rotating assembly 80 and the second rotating assembly 90 can respectively apply an extrusion force to the first bendable section 32 and the second bendable section 33 to shape the first bendable section 32 and the second bendable section 33 so that the first bendable section 32 and the second bendable section 33 are bent to form the expected shape.

[0094] The first rotating assembly 80 includes a first door panel 81, a first swing arm assembly, and a first adapter plate 83. The first swing arm assembly is movably connected to the shaft seat 60. The first swing arm assembly is movably connected to the first adapter plate 83. The first door panel 81 is movably connected to the first adapter plate 83. The first door panel 81 is movably connected to the first adapter plate 83. The first door panel 81 is movably connected to the first swing arm assembly. The first adapter plate 83 can be detachably connected to the corresponding shell component 40. For example, the first adapter plate 83 and the corresponding shell component 40 can be detachably connected using fasteners such as screws. The first door panel 81 includes a first support plane 811. The first support plane 811 of the first door panel 81 is used to support a portion of the flexible display screen 30.

[0095] In some embodiments, the first swing arm assembly may include a first auxiliary swing arm 82. The first auxiliary swing arm 82 is rotatably connected to the axle seat 60. The first auxiliary swing arm 82 is slidably connected to the first adapter plate 83. The first door panel 81 is rotatably connected to the first adapter plate 83. The first door panel 81 is slidably connected to the first auxiliary swing arm 82.

[0096] When the first rotating assembly 80 rotates relative to the shaft base 60 to switch between the deployed and folded states, the first auxiliary swing arm 82 rotates relative to the shaft base 60. A rotation axis is defined between the first auxiliary swing arm 82 and the shaft base 60. The first auxiliary swing arm 82 slides relative to the first adapter plate 83, and the first door panel 81 simultaneously slides relative to the first auxiliary swing arm 82, causing the first auxiliary swing arm 82 to drive the first door panel 81 to rotate synchronously with the first adapter plate 83.

[0097] The second rotating assembly 90 includes a second door panel 91, a second swing arm assembly, and a second adapter plate 93. The second swing arm assembly is movably connected to the shaft seat 60. The second swing arm assembly is movably connected to the second adapter plate 93. The second door panel 91 is movably connected to the second adapter plate 93. The second door panel 91 is movably connected to the second adapter plate 93. The second door panel 91 is movably connected to the second swing arm assembly. The second adapter plate 93 can be detachably connected to the corresponding shell component 40. For example, the second adapter plate 93 and the corresponding shell component 40 can be detachably connected using fasteners such as screws. The second door panel 91 includes a second support plane 911. The second support plane 911 of the second door panel 91 is used to support a portion of the flexible display screen 30.

[0098] In some embodiments, the first swing arm assembly may include a second auxiliary swing arm 92. The second auxiliary swing arm 92 is rotatably connected to the axle seat 60. The second auxiliary swing arm 92 is slidably connected to the second adapter plate 93. The second door panel 91 is rotatably connected to the second adapter plate 93. The second door panel 91 is slidably connected to the second auxiliary swing arm 92.

[0099] The first swing arm assembly, the first adapter plate 83, and the first door panel 81 rotate relative to the shaft seat 60, and the second swing arm assembly, the second adapter plate 93, and the second door panel 91 rotate relative to the shaft seat 60, so that the hinge device 50 can be switched to the folded state. When the hinge device 50 and the flexible display screen 30 are in the folded state, the first door panel 81 is configured to correspond to the first transition portion 322 of the first bendable section 32. The first support plane 811 of the first door panel 81 is used to support the first transition portion 322. The second door panel 91 is configured to correspond to the second transition portion 332 of the second bendable section 33. The second support plane 911 of the second door panel 91 is used to support the second transition portion 332.

[0100] When the second rotating assembly 90 rotates relative to the shaft base 60 to switch between the deployed and folded states, the second auxiliary swing arm 92 rotates relative to the shaft base 60. A rotation axis is defined between the second auxiliary swing arm 92 and the shaft base 60. The second auxiliary swing arm 92 slides relative to the second adapter plate 93, and the second door panel 91 simultaneously slides relative to the second auxiliary swing arm 92, causing the second auxiliary swing arm 92 to drive the second door panel 91 to rotate synchronously with the second adapter plate 93.

[0101] In the foldable screen device 10, when the hinge device 50 and the flexible display 30 are in the unfolded state, the first support plane 811 of the first door panel 81, the second support plane 911 of the second door panel 91, and the bearing plane 61 of the shaft seat 60 can be coplanar. The first support plane 811 of the first door panel 81, the second support plane 911 of the second door panel 91, and the bearing plane 61 of the shaft seat 60 can all be used to support the flexible display 30.

[0102] In the foldable screen device 10, when the hinge device 50 and the flexible display 30 are in the folded state, the first support plane 811 of the first door panel 81 supports the first transition portion 322, while the second support plane 911 of the second door panel 91 supports the second transition portion 332. The first door panel 81 and the second door panel 91 can respectively apply a compressive force to the first transition portion 322 and the second transition portion 332 of the flexible display 30 to reshape the first bendable section 32 and the second bendable section 33 of the flexible display 30, so that the first bendable section 32 and the second bendable section 33 can be bent into a desired shape under the constraints of the first door panel 81 and the second door panel 91.

[0103] In the embodiment of the present application, as shown in Figures 9 and 10, when the hinge device 50 is in the folded state, both the first support plane 811 and the second support plane 911 face the load-bearing plane 61, with the first support plane 811 facing the second support plane 911. When the hinge device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is acute, and the angle M2 between the second support plane 911 and the load-bearing plane 61 is acute, and M1 and M2 are unequal. In the hinge device 50 of the embodiment of the present application, the first rotating assembly 80 and the second rotating assembly 90 are asymmetrically arranged. When the first rotating assembly 80 and the second rotating assembly 90 each rotate relative to the axle base 60 to switch between the unfolded state and the folded state, the first door panel 81 and the second door panel 91 each have different motion trajectories, thereby ensuring that the angle M1 between the first support plane 811 and the load-bearing plane 61 is different from the angle M2 between the second support plane 911 and the load-bearing plane 61. When the hinge device 50 is in the folded state, the first door panel 81 and the second door panel 91 are in an asymmetrical arrangement.

[0104] The shaft seat 60 has a center plane P1. In the width direction of the shaft seat 60, the center plane P1 refers to a virtual reference plane that can divide the shaft seat 60 into equal parts. The center plane P1 of the shaft seat 60 can be perpendicular to the bearing plane 61 of the shaft seat 60. The flexible display screen 30 includes a first connecting section 31 and a second connecting section 34. When the flexible display screen 30 is in a folded state, the light emitting surface 30a of the first connecting section 31 and the light emitting surface 30a of the second connecting section 34 are parallel to each other. The vertical distance between the center plane P1 of the shaft seat 60 and the light emitting surface 30a of the first connecting section 31 is equal to the vertical distance between the center plane P1 of the shaft seat 60 and the light emitting surface 30a of the second connecting section 34. The center plane P1 of the shaft seat 60 is a virtual reference plane. The center plane P1 of the shaft seat 60 can be perpendicular to the width direction of the shaft seat 60.

[0105] Since the first door panel 81 and the second door panel 91 are respectively used to compress the first bendable section 32 and the second bendable section 33 so as to bend and deform the first bendable section 32 and the second bendable section 33, and the respective spatial positions of the first door panel 81 and the second door panel 91 are related to the bending configuration of the first bendable section 32 and the second bendable section 33, after the first bendable section 32 and the second bendable section 33 are compressed by the asymmetrically arranged first door panel 81 and the second door panel 91, the first bendable section 32 and the second bendable section 33 also form an asymmetrical structural configuration accordingly. The first bendable section 32 and the second bendable section 33 are asymmetrical relative to the center plane P1 of the shaft seat 60.

[0106] Therefore, the asymmetrical arrangement of the first rotating assembly 80 and the second rotating assembly 90 of the rotating shaft device 50 can enable the first bendable section 32 and the second bendable section 33 folded under the constraint of the rotating shaft device 50 to form an asymmetrical structural form accordingly.

[0107] In the embodiment of the present application, shell components 40 can be provided on both sides of the shaft seat 60 along the width direction of the shaft seat 60. The shell component 40 on one side is connected to the first adapter plate 83, and the shell component 40 on the other side is connected to the second adapter plate 93. The shell component 40, the first rotating assembly 80 and the second rotating assembly 90 can all be rotated and folded relative to the shaft seat 60. The rotating shaft device 50 also includes a shaft cover 70. The shaft seat 60 is connected to the shaft cover 70. When the shell components 40 on both sides are in a folded state, a portion of the shaft cover 70 can be in a visible state. When the shell components 40 on both sides are in an unfolded state, the shell components 40 can block the shaft cover 70.

[0108] In the embodiment of the present application, the shell member 40 includes an escape space. The escape space volume of one shell member 40 on either side of the shaft seat 60 is unequal to the escape space volume of the other shell member 40. When the folding screen device 10 switches between the unfolded state and the folded state, the escape space of the shell member 40 can be used to provide movement space for the first rotating assembly 80 and the second rotating assembly 90. When the folding screen device 10 is in the folded state, the escape space of one shell member 40 faces the escape space of the other shell member 40.

[0109] In some possible implementations, as shown in FIG9 , the shell components 40 on either side of the hinge assembly 50 have different thicknesses, effectively reducing the overall thickness of the foldable screen device 10 in the folded state and achieving a lightweight and thin design for the foldable screen device 10. The shell component 40 connected to the first adapter plate 83 has a greater thickness than the shell component 40 connected to the second adapter plate 93. The volume of the escape space of the shell component 40 connected to the first rotating assembly 80 can be greater than the volume of the escape space of the shell component 40 connected to the second rotating assembly 90. In some examples, along the thickness direction Z of the shell component 40, the maximum depth of the escape space of one shell component 40 on either side of the hinge assembly 50 is greater than the maximum depth of the escape space of the other, thereby increasing the escape space volume of one shell component 40. It should be noted that the depth direction of the escape space is the same as the thickness direction Z of the shell component 40. The thickness direction Z of the shell component 40 is the same as the thickness direction of the flexible display 30.

[0110] When the hinge assembly 50 of the present embodiment is in the folded state, the shaft seat 60, the first rotating assembly 80, and the second rotating assembly 90 form a space for accommodating the first bendable section 32 and the second bendable section 33 of the flexible display 30. The first and second rotating assemblies 80, 90 in the hinge assembly 50 are asymmetrically arranged, so that when the hinge assembly 50 is in the folded state, the first door panel 81 and the second door panel 91 are in different spatial positions. This creates an asymmetrical state for the first and second door panels 81, 91, and an unequal angle M1 between the first support plane 811 and the load-bearing plane 61 and the angle M2 between the second support plane 911 and the load-bearing plane 61. Because the first and second rotating assemblies 80, 90 are asymmetrical, the space formed by the shaft seat 60, the first and second rotating assemblies 80, 90 can be asymmetrical. The asymmetrical arrangement of the first and second rotating assemblies 80, 90 of the hinge assembly 50 allows them to simultaneously utilize the clearance space of both shell components 40. Therefore, the structural design of the hinge device 50 in the embodiment of the present application can make the thickness of the shell parts 40 on both sides designed to be different, so as to reduce the overall thickness of the folding screen device 10 in the folded state. In the case where the thickness of the shell parts 40 on both sides of the hinge device 50 are different, the volume of the avoidance space 40a of the shell parts 40 on both sides of the hinge device 50 is different. When the hinge device 50 is in the folded state, the first rotating component 80 and the second rotating component 90 can be biased toward the relatively larger avoidance space 40a, so that the size of the first rotating component 80 and the second rotating component 90 will not be reduced due to the reduction of the thickness of the shell part 40 on one side, which is conducive to removing the limitation of the size design of the first rotating component 80 and the second rotating component 90 from the relatively small avoidance space, so that the thickness of the folding screen device 10 can be reduced, while ensuring that the overall mechanical strength of the first rotating component 80 and the second rotating component 90 meets the design requirements.

[0111] In some feasible embodiments, as shown in Figures 8 and 9, an arc-shaped guide hole 160 can be provided on the first adapter plate 83. An arc-shaped connecting portion 170 is provided on the first door panel 81. The arc-shaped connecting portion 170 of the first door panel 81 rotates with the arc-shaped guide hole 160 of the first adapter plate 83. The arc-shaped connecting portion 170 of the first door panel 81 is plugged into the arc-shaped guide hole 160 of the first adapter plate 83, so that the first door panel 81 and the first adapter plate 83 are rotationally connected by a virtual axis, that is, the first door panel 81 and the first adapter plate 83 do not rotate with each other through a physical cylindrical axis. In some examples, along the axial direction of the shaft of the first auxiliary swing arm 82, arc-shaped guide holes 160 are respectively provided at opposite ends of the first adapter plate 83, and corresponding arc-shaped connecting portions 170 are provided on the first door panel 81.

[0112] In some feasible embodiments, an arc-shaped guide hole 160 may be provided on the second adapter plate 93. An arc-shaped connecting portion 170 is provided on the second door panel 91. The arc-shaped connecting portion 170 of the second door panel 91 is rotatably engaged with the arc-shaped guide hole 160 of the second adapter plate 93. The arc-shaped connecting portion 170 of the second door panel 91 is plugged into the arc-shaped guide hole 160 of the second adapter plate 93, so that the second door panel 91 and the second adapter plate 93 are rotationally connected by means of a virtual axis, that is, the second door panel 91 and the second adapter plate 93 do not rotate with each other through a physical cylindrical axis. In some examples, along the axial direction of the shaft of the second auxiliary swing arm 92, arc-shaped guide holes 160 are respectively provided at opposite ends of the second adapter plate 93, and corresponding arc-shaped connecting portions 170 are provided on the second door panel 91.

[0113] In some implementations, Figure 11 schematically illustrates a partial cross-sectional view of the foldable screen device 10 in its unfolded state. Referring to Figures 8 and 11 , the first adapter plate 83 has a slide groove 120. The first auxiliary swing arm 82 includes a slider 130 that is slidably connected to the slide groove 120. The second adapter plate 93 also has a slide groove 120. The second auxiliary swing arm 92 includes a slider 130 that cooperates with the slide groove 120.

[0114] In some achievable embodiments, FIG12 schematically shows a partial cross-sectional structure of the folding screen device 10 in an unfolded state. FIG13 schematically shows a partial cross-sectional structure of the rotating shaft device 50 in a folded state. Referring to FIG8 , FIG12 and FIG13 , the first auxiliary swing arm 82 further includes a shaft 150. The shaft 150 is disposed on the slider 130. A guide groove 140 is provided on the first door panel 81. The shaft 150 of the first auxiliary swing arm 82 passes through the guide groove 140 of the first door panel 81. The shaft 150 of the first auxiliary swing arm 82 is slidably connected to the guide groove 140 of the first door panel 81. The guide groove 140 is provided on the side of the first door panel 81 facing away from the first bendable section 32. The second auxiliary swing arm 92 further includes a shaft 150. The shaft 150 is disposed on the slider 130. A guide groove 140 is provided on the second door panel 91. The shaft 150 of the second auxiliary swing arm 92 is inserted into the guide groove 140 of the second door panel 91. The guide groove 140 is provided on a side of the second door panel 91 facing away from the second bendable section 33.

[0115] During the rotation of the first rotating component 80 relative to the axle seat 60, the slider 130 of the first auxiliary swing arm 82 slides in the slide groove 120 of the first adapter plate 83, and at the same time, the shaft 150 of the first auxiliary swing arm 82 slides in the guide groove 140 of the first door panel 81, thereby driving the arc-shaped connecting part 170 of the first door panel 81 to rotate relative to the arc-shaped guide hole 160 of the first adapter plate 83, so that the end of the first door panel 81 close to the axle seat 60 moves away from or close to the axle seat 60.

[0116] During the rotation of the second rotating assembly 90 relative to the shaft seat 60, the slider 130 of the second auxiliary swing arm 92 slides in the slide groove 120 of the second adapter plate 93. Simultaneously, the shaft 150 of the second auxiliary swing arm 92 slides in the guide groove 140 of the second door panel 91, thereby driving the arcuate connecting portion 170 of the second door panel 91 to rotate relative to the arcuate guide hole 160 of the second adapter plate 93. The end of the second door panel 91 near the shaft seat 60 moves away from or toward the shaft seat 60.

[0117] In some examples, the first auxiliary swing arm 82 is rotatably connected to the shaft seat 60 via a solid cylindrical shaft. The axis of the solid cylindrical shaft is the rotation axis O3 of the first auxiliary swing arm 82. The second auxiliary swing arm 92 is rotatably connected to the shaft seat 60 via a solid cylindrical shaft. The axis of the solid cylindrical shaft is the rotation axis O4 of the second auxiliary swing arm 92.

[0118] In some achievable embodiments, FIG14 schematically shows a partial cross-sectional structure of the rotating shaft device 50 in an expanded state. FIG15 schematically shows a partial cross-sectional structure of the rotating shaft device 50 in a folded state. Referring to FIG8 , FIG14 and FIG15 , the first rotating assembly 80 further includes a first main swing arm 84. The first main swing arm 84 is rotationally connected to the shaft seat 60. A rotation axis O5 is defined between the first main swing arm 84 and the shaft seat 60. The first main swing arm 84 is rotationally connected to the first adapter plate 83. A rotation axis O7 is defined between the first main swing arm 84 and the first adapter plate 83. The rotation axis O3 of the first auxiliary swing arm 82 is parallel to the rotation axis O5 of the first main swing arm 84, that is, the rotation axis O3 of the first auxiliary swing arm 82 does not overlap with the rotation axis O5 of the first main swing arm 84.

[0119] As the first rotating assembly 80 rotates relative to the shaft base 60, the first main swing arm 84 and the first auxiliary swing arm 82 both rotate relative to the shaft base 60. Simultaneously, the first auxiliary swing arm 82 slides relative to the first adapter plate 83, driving the first door panel 81 to rotate synchronously relative to the first adapter plate 83. When the first adapter plate 83 is connected to the housing member 40, the first adapter plate 83 and the housing member 40 rotate synchronously relative to the shaft base 60.

[0120] The second rotating assembly 90 also includes a second main swing arm 94. The second main swing arm 94 is rotatably connected to the shaft seat 60. A rotation axis O6 is defined between the second main swing arm 94 and the shaft seat 60. The second main swing arm 94 is rotatably connected to the second adapter plate 93. A rotation axis O8 is defined between the second main swing arm 94 and the second adapter plate 93. The rotation axis O4 of the second auxiliary swing arm 92 is parallel to the rotation axis O6 of the second main swing arm 94, that is, the rotation axis O4 of the second auxiliary swing arm 92 does not overlap with the rotation axis O6 of the second main swing arm 94.

[0121] As the second rotating assembly 90 rotates relative to the axle base 60, the second main swing arm 94 and the second auxiliary swing arm 92 both rotate relative to the axle base 60. The second auxiliary swing arm 92 simultaneously slides relative to the second adapter plate 93, driving the second door panel 91 to rotate synchronously relative to the second adapter plate 93. When the second adapter plate 93 is connected to the housing member 40, the second adapter plate 93 and the housing member 40 rotate synchronously relative to the axle base 60.

[0122] In some examples, the first main swing arm 84 is rotatably connected to the first adapter plate 83 via a solid cylindrical shaft. The axis of the solid cylindrical shaft is the rotation axis O7 of the first main swing arm 84. The second main swing arm 94 is rotatably connected to the second adapter plate 93 via a solid cylindrical shaft. The axis of the solid cylindrical shaft is the rotation axis O8 of the second main swing arm 94.

[0123] In some achievable embodiments, the shaft seat 60 includes a first arcuate groove 60a and a second arcuate groove 60b. The first main swing arm 84 includes a first arcuate block 841. The first arcuate block 841 is rotationally connected to the first arcuate groove 60a. The first main swing arm 84 and the shaft seat 60 are rotationally connected by a virtual axis, that is, the first main swing arm 84 and the shaft seat 60 are not rotated by a physical cylindrical axis. The second main swing arm 94 includes a second arcuate block 941. The second arcuate block 941 is rotationally connected to the second arcuate groove 60b. The second main swing arm 94 and the shaft seat 60 are rotationally connected by a virtual axis, that is, the second main swing arm 94 and the shaft seat 60 are not rotated by a physical cylindrical axis.

[0124] In some possible implementations, FIG16 schematically shows a partial cross-sectional structure of the folding screen device 10 in the unfolded state. Referring to FIG8 and FIG16 , the first main swing arm 84 and the second main swing arm 94 both include a shaft 150. The first door panel 81 and the second door panel 91 are both provided with a guide groove 140. The shaft 150 of the first main swing arm 84 slides in engagement with the guide groove 140 of the first door panel 81. The shaft 150 of the second main swing arm 94 slides in engagement with the guide groove 140 of the second door panel 91.

[0125] In some examples, the first auxiliary swing arm 82 and the second auxiliary swing arm 92 both include a shaft 150. The first main swing arm 84 and the second main swing arm 94 both include a shaft 150. The first door panel 81 and the second door panel 91 are both provided with corresponding guide grooves 140. During the rotation of the first rotating assembly 80, the first main swing arm 84 and the first auxiliary swing arm 82 jointly drive the first door panel 81 to rotate relative to the first adapter plate 83. The end of the first door panel 81 near the shaft seat 60 moves away from or toward the shaft seat 60. The second main swing arm 94 and the second auxiliary swing arm 92 jointly drive the second door panel 91 to rotate relative to the second adapter plate 93. The end of the second door panel 91 near the shaft seat 60 moves away from or toward the shaft seat 60.

[0126] In some possible implementations, as shown in FIG16 , the thickness of the shell member 40 corresponding to the first auxiliary swing arm 82 and the first main swing arm 84 is greater than the thickness of the shell member 40 corresponding to the second auxiliary swing arm 92 and the second main swing arm 94. The shell member 40 corresponding to the first auxiliary swing arm 82 and the first main swing arm 84 has a relatively large avoidance space, while the shell member 40 corresponding to the second auxiliary swing arm 92 and the second main swing arm 94 has a relatively small avoidance space.

[0127] Figure 17 schematically shows the local structure of the folding screen device 10 in a folded state. As shown in Figure 17, when the hinge device 50 is in the folded state, the angle M1 between the first support plane 811 of the first door panel 81 and the bearing plane 61 of the shaft seat 60 is smaller than the angle M2 between the second support plane 911 of the second door panel 91 and the bearing plane 61 of the shaft seat 60, that is, M1 < M2. In the folding screen device 10 of the embodiment of the present application, when the hinge device 50 is in the folded state, the first bendable section 32 and the second bendable section 33 of the flexible display screen 30 are correspondingly in a folded state. Since the first door panel 81 and the second door panel 91 are asymmetrically arranged, under the constraints of the first door panel 81 and the second door panel 91, the shape of the first bendable section 32 and the second bendable section 33 of the flexible display screen 30 after folding is also asymmetrical. When the hinge device 50 and the flexible display screen 30 are in the folded state, the first bendable section 32 forms a first transition portion 322 in an area corresponding to the first door panel 81 , and the second bendable section 33 forms a second transition portion 332 in an area corresponding to the second door panel 91 .

[0128] In some embodiments, when the flexible display 30 is in the folded state, the angle between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is A1, while the angle between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34 is A2, where A1 is greater than A2. The first transition portion 322 of the first bendable segment 32 and the second transition portion 332 of the second bendable segment 33 are asymmetrically arranged. In some examples, when the hinge device 50 and the flexible display 30 are in the folded state, the first support plane 811 can be parallel to the light-emitting surface 30a of the first transition portion 322, and the second support plane 911 can be parallel to the light-emitting surface 30a of the second transition portion 332.

[0129] In some embodiments, as shown in FIG. 17 , the flexible display 30 has a light-emitting surface 30a and a backlight surface 30b that are opposed to each other along its thickness. When the foldable screen device 10 is in the unfolded state, the light-emitting surface 30a of the flexible display 30 is exposed to facilitate presenting image information to the user. The flexible display 30 can be folded under the constraints of the hinge assembly 50. When the flexible display 30 is in the folded state, the first inwardly curved portion 321 is positioned adjacent to the axle seat 60. When the flexible display 30 is in the folded state, the first inwardly curved portion 321 has a bending axis T1 located on the side of the light-emitting surface 30a of the flexible display 30, while the first outwardly curved portion 323 has a bending axis T3 located on the side of the backlight surface 30b of the flexible display 30. When the flexible display 30 is in the folded state, the second inwardly curved portion 331 is positioned adjacent to the axle seat 60. The first inwardly curved portion 321 and the second inwardly curved portion 331 are respectively positioned on either side of the center plane P1 of the axle seat 60. When the flexible display screen 30 is in the folded state, the second inner curved portion 331 has a bending axis T2 located on the light emitting surface 30 a side of the flexible display screen 30 , and the second outer curved portion 333 has a bending axis T4 located on the backlight surface 30 b side of the flexible display screen 30 .

[0130] The bending axis T1 of the first inner bend portion 321 and the bending axis T2 of the second inner bend portion 331 are coplanar. To facilitate the description of the embodiments of the present application, a reference plane P2 is introduced as a reference plane. The bending axis T1 of the first inner bend portion 321 and the bending axis T2 of the second inner bend portion 331 are located within the reference plane P2. The reference plane P2 is parallel to the center plane P1 of the shaft seat 60. The bending axis T1 of the first inner bend portion 321 and the bending axis T2 of the second inner bend portion 331 are each located on the same side of the center plane P1 of the shaft seat 60, that is, the bending axis T1 of the first inner bend portion 321 and the bending axis T2 of the second inner bend portion 331 are each located on the side of the center plane P1 of the shaft seat 60 close to the shell component 40 with a relatively large thickness. In some examples, the bending axis T1 of the first inner curved portion 321 and the bending axis T2 of the second inner curved portion 331 are collinear, that is, the bending axis T1 of the first inner curved portion 321 coincides with the bending axis T2 of the second inner curved portion 331. The radius of the first inner curved portion 321 is equal to the radius of the second inner curved portion 331. The radius of the first outer curved portion 323 can be greater than the radius of the second outer curved portion 333.

[0131] In the foldable screen device 10 of the embodiment of the present application, when the flexible display screen 30 is in the folded state, the asymmetric arrangement of the first bendable section 32 and the second bendable section 33 of the flexible display screen 30 allows the flexible display screen 30 to fully utilize the avoidance space 40a on both sides at the same time, so as to increase the overall bending radius of the first bendable section 32 and the second bendable section 33, and reduce the bending degree of at least one of the first bendable section 32 and the second bendable section 33, thereby reducing the pressure degree of at least one of the first bendable section 32 and the second bendable section 33, and further reducing the possibility of structural damage to the flexible display screen 30 due to excessive extrusion, and at the same time, it is also beneficial to reduce the crease formed by the first bendable section 32 and the second bendable section 33 in the unfolded state, thereby improving the flatness of the flexible display screen 30 and improving the user experience.

[0132] In some embodiments, when the hinge device 50 is in a folded state, under the condition that the angle M1 between the first supporting plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second supporting plane 911 and the load-bearing plane 61, that is, M1<M2, by adjusting the values ​​of M1 and M2, the shape of the first bendable section 32 and the second bendable section 33 after bending and deformation can be adjusted.

[0133] In some examples, Figure 18 schematically illustrates a partial structure of the foldable screen device 10 in a folded state. As shown in Figure 18 , when the flexible display screen 30 is in the folded state, the angle between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is A1, while the angle between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34 is A2, where A1 is greater than A2. The vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the first connecting segment 31 is B1, while the vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the second connecting segment 34 is B2, where B1 is less than B2. The bending axes T1 of the first inwardly curved portion 321 and T2 of the second inwardly curved portion 331 are each located on the side of the central plane P1 of the shaft seat 60 that is closer to the relatively thick shell component 40. At the same time, the bending axis T1 of the first inner curved portion 321 is parallel to the bending axis T2 of the second inner curved portion 331. The radius of the first inner curved portion 321 is greater than the radius of the second inner curved portion 331. For example, the radius of the first outer curved portion 323 can be greater than the radius of the second outer curved portion 333. For example, both the first bendable section 32 and the second bendable section 33 are offset toward the side of the shell member 40, which has a relatively greater thickness.

[0134] In some examples, Figure 19 schematically illustrates a partial structure of the foldable screen device 10 in a folded state. As shown in Figure 19 , when the flexible display screen 30 is in the folded state, the angle between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is A1, while the angle between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34 is A2, where A1 is greater than A2. The vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the first connecting segment 31 is B1, while the vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the second connecting segment 34 is B2, where B1 is less than B2. The bending axes T1 of the first inwardly curved portion 321 and T2 of the second inwardly curved portion 331 are each located on the side of the central plane P1 of the shaft seat 60 that is closer to the relatively thick shell component 40. At the same time, the bending axis T1 of the first inner curved portion 321 and the bending axis T2 of the second inner curved portion 331 are parallel to each other. The radius of the first inner curved portion 321 is smaller than the radius of the second inner curved portion 331. For example, the radius of the first outer curved portion 323 can be smaller than the radius of the second outer curved portion 333. For example, both the first bendable section 32 and the second bendable section 33 are offset toward the side of the shell component 40 with a relatively greater thickness, thereby fully utilizing the clearance space between the two shell components 40.

[0135] In some examples, Figure 20 schematically illustrates a partial structure of the foldable screen device 10 in a folded state. As shown in Figure 20 , when the flexible display screen 30 is in the folded state, the angle between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is A1, while the angle between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34 is A2, where A1 is greater than A2. The vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the first connecting segment 31 is B1, while the vertical distance between the bending axis T1 of the first inwardly curved portion 321 and the light-emitting surface 30a of the second connecting segment 34 is B2, where B1 is equal to B2. The bending axes T1 of the first inwardly curved portion 321 and T2 of the second inwardly curved portion 331 are located on the center plane P1 of the shaft seat 60. At the same time, the bending axis T1 of the first inner curved portion 321 and the bending axis T2 of the second inner curved portion 331 are parallel to each other. The radius of the first inner curved portion 321 is greater than the radius of the second inner curved portion 331. For example, the radius of the first outer curved portion 323 can be smaller than the radius of the second outer curved portion 333. For example, the first bendable section 32 can protrude toward the relatively thicker shell component 40 to fully utilize the clearance space between the two shell components 40.

[0136] In the embodiment of the present application, under the condition that the angle M1 between the first supporting plane 811 and the bearing plane 61 is smaller than the angle M2 between the second supporting plane 911 and the bearing plane 61, that is, M1<M2, neither the bending axis T1 of the first inner bend portion 321 nor the bending axis T2 of the second inner bend portion 331 will be located on the side of the center plane P1 close to the shell component 40 with relatively smaller thickness.

[0137] In some achievable embodiments, Figure 21 schematically shows a partial cross-sectional structure of the hinge device 50 in a folded state. Figure 22 schematically shows a partial structure of the folding screen device 10 in a folded state. Referring to Figures 21 and 22, during the process of the first door panel 81 and the second door panel 91 rotating relative to the shaft seat 60, the first door panel 81 and the second door panel 91 each rotate around their own rotation axis at the same time. The first door panel 81 is asymmetrically arranged relative to the rotation axis O1 of the first adapter plate 83 and the second door panel 91 is asymmetrically arranged relative to the rotation axis O2 of the second adapter plate 93. When the hinge device 50 is in a folded state, the vertical distance K1 between the rotation axis O1 of the first door panel 81 and the load-bearing plane 61 is greater than the vertical distance K2 between the rotation axis O2 of the second door panel 91 and the load-bearing plane 61. By setting the rotation axis O1 of the first door panel 81 and the rotation axis O2 of the second door panel 91 in an asymmetric manner, the movement trajectories of the first door panel 81 and the second door panel 91 are different, thereby ensuring that when the hinge device 50 is in a folded state, the position of the first support plane 811 is different from the position of the second support plane 911.

[0138] By adjusting the vertical distance K1 between the rotation axis O1 of the first door panel 81 and the load-bearing plane 61 or the vertical distance K2 between the rotation axis O2 of the second door panel 91 and the load-bearing plane 61, the position of the first support plane 811 or the position of the second support plane 911 can be adjusted to ensure that the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0139] By adjusting the position of the rotation axis O1 of the first door panel 81 and the rotation axis O2 of the second door panel 91, when the hinge device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. This is beneficial to ensure that the connection method and assembly method between the first door panel 81 and the first adapter plate 83 or between the second door panel 91 and the second adapter plate 93 do not change. The size of the arc guide hole 160 and the arc connecting part 170 (for example, the radius of the arc guide hole 160 and the radius of the arc connecting part 170) can be changed to ensure that the position of the first support plane 811 and the position of the second support plane 911 are different, which is beneficial to reduce the structural design complexity of the first door panel 81 and the first adapter plate 83, or reduce the structural design complexity of the second door panel 91 and the second adapter plate 93.

[0140] In some achievable embodiments, FIG23 schematically illustrates a partial cross-sectional view of the pivot assembly 50 in its unfolded state. Referring to FIG23 , the vertical distance between the rotation axis O3 of the first auxiliary swing arm 82 relative to the axle seat 60 and the center plane P1 of the axle seat 60 is F11, and the vertical distance between the rotation axis O4 of the second auxiliary swing arm 92 relative to the axle seat 60 and the center plane P1 of the axle seat 60 is F21, wherein F11 is greater than F21. The first auxiliary swing arm 82 and the second auxiliary swing arm 92 are asymmetrically arranged. By arranging the rotation axis O3 of the first auxiliary swing arm 82 and the rotation axis O4 of the second auxiliary swing arm 92 asymmetrically, the movement trajectories of the first door panel 81 and the second door panel 91 are different, ultimately ensuring that when the pivot assembly 50 is in the folded state, the position of the first support plane 811 is different from the position of the second support plane 911.

[0141] By adjusting the positions of the rotation axis O3 of the first auxiliary swing arm 82 and the rotation axis O4 of the second auxiliary swing arm 92, the movement trajectories of the first door panel 81 and the second door panel 91 are made different, thereby ensuring that the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0142] By adjusting the positions of the rotation axis O3 of the first auxiliary swing arm 82 and the rotation axis O4 of the second auxiliary swing arm 92, when the rotating shaft device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. This is beneficial to ensuring that the connection method and assembly method between the first auxiliary swing arm 82 and the axle seat 60 or between the second auxiliary swing arm 92 and the axle seat 60 do not change. Under the condition that the connection position of the first auxiliary swing arm 82 and the axle seat 60 or the connection position of the second auxiliary swing arm 92 and the axle seat 60 does not change, the position of the first support plane 811 and the position of the second support plane 911 can be changed, which is beneficial to reducing the structural design complexity of the first auxiliary swing arm 82 and the axle seat 60, or reducing the structural design complexity of the second auxiliary swing arm 92 and the axle seat 60.

[0143] In some feasible embodiments, as shown in Figure 23, when the rotating shaft device 50 is in the expanded state, the distance between the rotation axis O3 of the first auxiliary swing arm 82 relative to the axle seat 60 and the load-bearing plane 61 is F1, and the distance between the rotation axis O4 of the second auxiliary swing arm 92 relative to the axle seat 60 and the load-bearing plane 61 is F2, where F1 is equal to F2.

[0144] In some achievable embodiments, FIG24 schematically shows a partial cross-sectional structure of the folding screen device 10 in an unfolded state. Referring to FIG24 , the vertical distance between the first main swing arm 84 and the rotation axis O5 of the shaft seat 60 and the center plane P1 of the shaft seat 60 is H11, and the vertical distance between the second main swing arm 94 and the rotation axis O6 of the shaft seat 60 and the center plane P1 of the shaft seat 60 is H21, wherein H11 is greater than H21. The first main swing arm 84 and the second main swing arm 94 are arranged asymmetrically. The first main swing arm 84 is rotatably connected to the first adapter plate 83. The second main swing arm 94 is rotatably connected to the second adapter plate 93. The asymmetrical arrangement of the first main swing arm 84 relative to the rotation axis O5 of the shaft seat 60 and the second main swing arm 94 relative to the rotation axis O6 of the shaft seat 60 can make the movement trajectory of the first adapter plate 83 and the movement trajectory of the second adapter plate 93 different, thereby making the movement trajectory of the first door panel 81 and the movement trajectory of the second door panel 91 different, and further ensuring that the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0145] By adjusting the positions of the rotation axis O5 of the first main swing arm 84 and the rotation axis O6 of the second main swing arm 94, when the rotating shaft device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. This is beneficial to ensuring that the connection method and assembly method between the first main swing arm 84 and the shaft seat 60 or between the second main swing arm 94 and the shaft seat 60 do not change. Under the condition that the connection position of the first main swing arm 84 and the shaft seat 60 or the connection position of the second main swing arm 94 and the shaft seat 60 is changed, to ensure that the position of the first support plane 811 and the position of the second support plane 911 are different, it is beneficial to reduce the structural design complexity of the first main swing arm 84 and the shaft seat 60, or reduce the structural design complexity of the second main swing arm 94 and the shaft seat 60.

[0146] In some examples, as shown in FIG. 24 , when the hinge assembly 50 is in the deployed state, the vertical distance between the first main swing arm 84 and the rotation axis O7 of the first adapter plate 83 and the load-bearing plane 61 is G1, while the vertical distance between the second main swing arm 94 and the rotation axis O8 of the second adapter plate 93 and the load-bearing plane 61 is G2, where G1 is greater than G2. In this embodiment of the present application, the thickness of the shell component 40 corresponding to the first main swing arm 84 is greater than the thickness of the shell component 40 corresponding to the second main swing arm 94. Along the thickness direction Z of the shell component 40, the shell component 40 corresponding to the first main swing arm 84 has an inner wall surface facing the first main swing arm 84. When the hinge assembly 50 is in the deployed state, the connection point between the first main swing arm 84 and the first adapter plate 83 can be relatively close to the inner wall surface of the shell component 40, thereby effectively utilizing the clearance space of the shell component 40 between the first main swing arm 84 and the first adapter plate 83.

[0147] In some examples, as shown in FIG. 24 , when the hinge assembly 50 is in the deployed state, the vertical distance between the first main swing arm 84 and the rotation axis O7 of the first adapter plate 83 and the center plane P1 of the shaft seat 60 is G11, while the vertical distance between the second main swing arm 94 and the rotation axis O8 of the second adapter plate 93 and the center plane P1 of the shaft seat 60 is G21, where G11 is greater than G21. The asymmetrical positioning of the rotation axis O7 of the first main swing arm 84 and the rotation axis O8 of the second main swing arm 94 can cause the movement trajectory of the first adapter plate 83 and the second adapter plate 93 to be different, thereby causing the movement trajectory of the first door panel 81 and the second door panel 91 to be different. Furthermore, when the first door panel 81 and the second door panel 91 are in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 can be smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0148] By adjusting the positions of the rotation axis O7 of the first main swing arm 84 and the rotation axis O8 of the second main swing arm 94, when the rotating shaft device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. This is beneficial to ensure that the connection method and assembly method between the first main swing arm 84 and the first adapter plate 83 or between the second main swing arm 94 and the second adapter plate 93 do not change, so as to ensure that the position of the first support plane 811 and the position of the second support plane 911 are different, which is beneficial to reduce the structural design complexity of the first main swing arm 84 and the first adapter plate 83, or reduce the structural design complexity of the second main swing arm 94 and the second adapter plate 93.

[0149] In some achievable embodiments, FIG25 schematically shows a partial cross-sectional structure of the pivot device 50 in an expanded state. Referring to FIG25 , the first main swing arm 84 and the second main swing arm 94 both include a shaft 150. The first door panel 81 and the second door panel 91 are both provided with a guide groove 140. The shaft 150 of the first main swing arm 84 slides in engagement with the guide groove 140 of the first door panel 81. The shaft 150 of the second main swing arm 94 slides in engagement with the guide groove 140 of the second door panel 91. When the pivot device 50 is in an expanded state, the vertical distance between the rotation axis of the shaft 150 of the first main swing arm 84 and the load-bearing plane 61 is Q1, and the vertical distance between the rotation axis of the shaft 150 of the second main swing arm 94 and the load-bearing plane 61 is Q2, wherein Q1 is greater than Q2.

[0150] In some feasible embodiments, when the rotating shaft device 50 is in the expanded state, the vertical distance between the rotation axis of the shaft body 150 of the first main swing arm 84 and the center plane P1 of the shaft seat 60 is Q11, and the vertical distance between the rotation axis of the shaft body 150 of the second main swing arm 94 and the center plane P1 of the shaft seat 60 is Q21, where Q11 is greater than Q21.

[0151] The first main swing arm 84 can drive the first door panel 81 to rotate relative to the first adapter plate 83 via the shaft 150. The second main swing arm 94 can drive the second door panel 91 to rotate relative to the second adapter plate 93 via the shaft 150. The position of the shaft 150 of the first main swing arm 84 and the position of the shaft 150 of the second main swing arm 94 are arranged asymmetrically, so that the movement trajectory of the first door panel 81 and the movement trajectory of the second door panel 91 are different. Therefore, when the first door panel 81 and the second door panel 91 are in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0152] By adjusting the position of the shaft 150 of the first main swing arm 84 and the position of the shaft 150 of the second main swing arm 94, when the rotating shaft device 50 is in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. This is beneficial to ensure that the connection method and assembly method between the first main swing arm 84 and the first door panel 81 or between the second main swing arm 94 and the second door panel 91 do not change, so as to ensure that the position of the first support plane 811 and the position of the second support plane 911 are different, which is beneficial to reduce the structural design complexity of the first main swing arm 84 and the first door panel 81, or reduce the structural design complexity of the second main swing arm 94 and the second door panel 91.

[0153] In some achievable embodiments, FIG26 schematically shows a partial cross-sectional structure of the rotation process of the first main swing arm 84 and the second main swing arm 94. Referring to FIG26 , the first main swing arm 84 of the first rotating assembly 80 is rotationally connected to the shaft seat 60. The second main swing arm 94 of the second rotating assembly 90 is rotationally connected to the shaft seat 60. When the flexible display screen 30 switches between the unfolded state and the folded state, the rotation angle α1 of the first main swing arm 84 relative to the shaft seat 60 is greater than the rotation angle α2 of the second main swing arm 94 relative to the shaft seat 60, thereby making the movement trajectory of the first door panel 81 different from the movement trajectory of the second door panel 91. As a result, when the first door panel 81 and the second door panel 91 are in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61.

[0154] In the embodiment of the present application, the asymmetrical arrangement of the first rotating component 80 and the second rotating component 90 allows the rotating shaft device 50 to effectively utilize the avoidance space of the shell components 40 on both sides at the same time, which is beneficial to differentiate the sizes or shapes of the first auxiliary swing arm 82, the second auxiliary swing arm 92, the first adapter plate 83, the second adapter plate 93, the first door panel 81, the second door panel 91, the first main swing arm 84 and the second main swing arm 94, so as to ensure the mechanical strength and processing feasibility of the first rotating component 80 and the second rotating component 90.

[0155] In some possible implementations, FIG27 schematically shows a partial cross-sectional structure of the flexible display 30 and the metal support backplane in a folded state. FIG28 schematically shows a partial structure of the metal support backplane in an unfolded state. Referring to FIG27 and FIG28 , the folding screen device 10 further includes a metal support backplane 180. The metal support backplane 180 is located on the backlight side of the flexible display 30. The first rotating assembly 80 and the second rotating assembly 90 of the hinge device 50 can apply a squeezing force to the metal support backplane 180 and the flexible display 30 to cause the metal support backplane 180 and the flexible display 30 to fold synchronously.

[0156] The metal support back plate 180 includes a first region 180a and a second region 180b. A plurality of first grooves 181 are provided on the first region 180a. A plurality of second grooves 182 are provided on the second region 180b. The first and second regions 181, 182 are provided on the surfaces of the first and second regions 180a, 180b facing the shell component 40, respectively. The first and second regions 180a, 180b of the metal support back plate 180 have relatively low rigidity, and thus are prone to bending deformation when subjected to external forces. When the metal support back plate 180 and the flexible display screen 30 are in a folded state, the first and second regions 180a, 180b of the metal support back plate 180 correspond to the first and second outer bends 323, 333, respectively, and the bending shapes of the first and second regions 180a, 180b are the same as the bending shapes of the first and second outer bends 323, 333, respectively.

[0157] The opening of the first slot 181 and the opening of the second slot 182 both face away from the flexible display 30. Along the thickness direction of the metal support backplate 180, the first slot 181 and the second slot 182 do not penetrate the metal support backplate 180. There are multiple first slots 181. These multiple first slots 181 are spaced apart along the length of the metal support backplate 180. There are multiple second slots 182. These multiple second slots 182 are spaced apart along the length of the metal support backplate 180.

[0158] In some implementations, when the metal support backplane 180 is in the unfolded state, the metal support backplane 180 has a centerline V. When the metal support backplane 180 is in the unfolded state, the metal support backplane 180 is flat. A line connecting the midpoints of the two long sides of the metal support backplane 180 forms the centerline V of the metal support backplane 180. The portions of the metal support backplane 180 on either side of the centerline V are asymmetrical.

[0159] In some examples, when the first door panel 81 and the second door panel 91 are in the folded state, the angle M1 between the first support plane 811 and the load-bearing plane 61 is smaller than the angle M2 between the second support plane 911 and the load-bearing plane 61. The angle A1 between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is larger than the angle A2 between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34. The minimum vertical distance between the first region 180a and the centerline V is J1, while the minimum vertical distance between the second region 180b and the centerline V is J2, where J1 is greater than J2.

[0160] In some examples, the width of the first region 180a is greater than the width of the second region 180b. The width of the first region 180a and the width of the second region 180b refer to the dimension values ​​along the length direction of the metal support backplate 180. The number of first slots 181 is greater than the number of second slots 182, and the width of the first slot 181 is less than the width of the second slot 182. The width of the first slot 181 and the width of the second slot 182 refer to the dimension values ​​along the length direction of the metal support backplate 180. When the metal support backplate 180 and the flexible display screen 30 are in a folded state, the vertical distance between the bending axis T1 of the first inner bend 321 and the light emitting surface 30a of the first connecting segment 31 is B1, and the vertical distance between the bending axis T1 of the first inner bend 321 and the light emitting surface 30a of the second connecting segment 34 is B2, where B1 is less than B2.

[0161] In some embodiments, the metal support backplane 180 includes a third region 180c and a fourth region 180d. A plurality of first hollow holes 183 are provided in the third region 180c. A plurality of second hollow holes 184 are provided in the fourth region 180d. The third region 180c and the fourth region 180d of the metal support backplane 180 have relatively low rigidity, and thus are susceptible to bending deformation when subjected to external forces. When the metal support backplane 180 and the flexible display 30 are in a folded state, the third region 180c and the fourth region 180d of the metal support backplane 180 correspond to the first inner curvature 321 and the second inner curvature 331, respectively, and the curvature of the third region 180c and the fourth region 180d are the same as the curvature of the first inner curvature 321 and the second inner curvature 331, respectively.

[0162] In some examples, when the first door panel 81 and the second door panel 91 are in the folded state, the included angle M1 between the first support plane 811 and the bearing plane 61 of the shaft seat 60 is smaller than the included angle M2 between the second support plane 911 and the bearing plane 61 of the shaft seat 60. The included angle A1 between the light-emitting surface 30a of the first transition portion 322 and the light-emitting surface 30a of the first connecting segment 31 is larger than the included angle A2 between the light-emitting surface 30a of the second transition portion 332 and the light-emitting surface 30a of the second connecting segment 34. The minimum vertical distance between the third region 180c and the centerline V is L1, while the minimum vertical distance between the fourth region 180d and the centerline V is L2, where L1 is greater than L2.

[0163] In some examples, the width of the third region 180c is greater than the width of the fourth region 180d. The number of first hollow holes 183 is greater than the number of second hollow holes 184, and the diameter of the first hollow holes 183 is smaller than the diameter of the second hollow holes 184. The cross-sectional area of ​​the first hollow holes 183 is smaller than the cross-sectional area of ​​the second hollow holes 184. The width of the third region 180c, the width of the fourth region 180d, the diameter of the first hollow holes 183, and the diameter of the second hollow holes 184 refer to the dimensions along the length of the metal support backplate 180. When the metal support backplate 180 and the flexible display 30 are in the folded state, the radius of the first inner curvature 321 is equal to the radius of the second inner curvature 331.

[0164] In some feasible embodiments, FIG29 schematically shows a local structure of the folding screen device 10 in a folded state. As shown in FIG29 , the folding screen device 10 further includes an external display screen 190. When the folding screen device 10 is in a folded state, the folding screen device 10 can display relevant image information through the external display screen 190, so as to facilitate the user to perform relevant operations. Among the shell parts 40 on both sides of the hinge device 50, the shell part 40 connected to the first rotating assembly 80 has a relatively large thickness. The external display screen 190 is arranged on the shell part 40 connected to the first rotating assembly 80. The thickness of the shell part 40 connected to the first rotating assembly 80 should not be too small to ensure that the shell part 40 has space that meets the installation requirements of the external display screen 190. The backlight side of the external display screen 190 is arranged to face the backlight side of the flexible display screen 30.

[0165] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0166] The embodiments of the present application do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically specified.

[0167] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, systems, products or devices.

[0168] The term "plurality" in this document refers to two or more. The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the related objects; in a formula, the character " / " indicates a "division" relationship between the related objects.

[0169] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0170] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A hinge device for a folding screen device, wherein the folding screen device includes a flexible display screen, characterized in that: The rotating shaft device comprises: An axle seat, a first rotating assembly and a second rotating assembly, wherein the first rotating assembly and the second rotating assembly are respectively arranged on both sides of the axle seat; The shaft seat includes a bearing plane, and the bearing plane is used to support part of the flexible display screen; The first rotating assembly includes a first swing arm assembly, a first adapter plate, and a first door panel, the first swing arm assembly is movably connected to the shaft seat, the first swing arm assembly is movably connected to the first adapter plate, the first door panel is movably connected to the first adapter plate, and the first door panel is movably connected to the first swing arm assembly, the first door panel includes a first support plane, and the first support plane is used to support a portion of the flexible display screen; The second rotating assembly includes a second swing arm assembly, a second adapter plate, and a second door panel, the second swing arm assembly is movably connected to the shaft seat, the second swing arm assembly is movably connected to the second adapter plate, the second door panel is movably connected to the second adapter plate, and the second door panel is movably connected to the second swing arm assembly, the second door panel includes a second support plane, and the second support plane is used to support a portion of the flexible display screen; The first swing arm assembly, the first adapter plate and the first door panel rotate relative to the axle seat, and the second swing arm assembly, the second adapter plate and the second door panel rotate relative to the axle seat, so that when the pivot device is in a folded state, the angle M1 between the first support plane and the load-bearing plane is an acute angle, the angle M2 between the second support plane and the load-bearing plane is an acute angle, and M1 is smaller than M2.

2. The rotating shaft device according to claim 1, characterized in that: The first door panel is rotatably connected to the first adapter plate, and the second door panel is rotatably connected to the second adapter plate. When the hinge device is in a folded state, the vertical distance between the rotation axis of the first door panel relative to the first adapter plate and the load-bearing plane is greater than the vertical distance between the rotation axis of the second door panel relative to the second adapter plate and the load-bearing plane.

3. The rotating shaft device according to claim 1 or 2, characterized in that: The axle seat has a center plane, the load-bearing plane is perpendicular to the center plane, the first swing arm assembly includes a first auxiliary swing arm, the second swing arm assembly includes a second auxiliary swing arm, the first auxiliary swing arm and the second auxiliary swing arm are respectively rotatably connected to the axle seat, the vertical distance between the rotation axis of the first auxiliary swing arm relative to the axle seat and the center plane is F11, and the vertical distance between the rotation axis of the second auxiliary swing arm relative to the axle seat and the center plane is F21, wherein F11 is greater than F21.

4. The rotating shaft device according to any one of claims 1 to 3, characterized in that: The shaft seat has a center plane, and the load-bearing plane is perpendicular to the center plane. The first swing arm assembly also includes a first main swing arm, and the second swing arm assembly also includes a second main swing arm. The first main swing arm and the second main swing arm are respectively rotatably connected to the shaft seat. The vertical distance between the first main swing arm relative to the rotation axis of the shaft seat and the center plane is H11, and the vertical distance between the second main swing arm relative to the rotation axis of the shaft seat and the center plane is H21, wherein H11 is greater than H21.

5. The rotating shaft device according to claim 4, characterized in that: The first main swing arm is rotationally connected to the first adapter plate, and the second main swing arm is rotationally connected to the second adapter plate. When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the first main swing arm relative to the first adapter plate and the load-bearing plane is G1, and the vertical distance between the rotation axis of the second main swing arm relative to the second adapter plate and the load-bearing plane is G2, wherein G1 is greater than G2.

6. The rotating shaft device according to claim 4 or 5, characterized in that: The first main swing arm is rotationally connected to the first adapter plate, and the second main swing arm is rotationally connected to the second adapter plate. When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the first main swing arm relative to the first adapter plate and the center plane is G11, and the vertical distance between the rotation axis of the second main swing arm relative to the second adapter plate and the center plane is G21, wherein G11 is greater than G21.

7. The rotating shaft device according to any one of claims 4 to 6, characterized in that: The first main swing arm is slidably connected to the first door panel, and the second main swing arm is slidably connected to the second door panel.

8. The rotating shaft device according to claim 7, characterized in that: The first main swing arm and the second main swing arm both include a shaft body, and the first door panel and the second door panel are both provided with a guide groove. The shaft body of the first main swing arm is slidably engaged with the guide groove of the first door panel, and the shaft body of the second main swing arm is slidably engaged with the guide groove of the second door panel. When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the shaft body of the first main swing arm and the load-bearing plane is Q1, and the vertical distance between the rotation axis of the shaft body of the second main swing arm and the load-bearing plane is Q2, wherein Q1 is greater than Q2.

9. The rotating shaft device according to claim 7 or 8, characterized in that: The first main swing arm and the second main swing arm both include a shaft body, and the first door panel and the second door panel are both provided with a guide groove. The shaft body of the first main swing arm is slidably engaged with the guide groove of the first door panel, and the shaft body of the second main swing arm is slidably engaged with the guide groove of the second door panel. When the rotating shaft device is in the expanded state, the vertical distance between the rotation axis of the shaft body of the first main swing arm and the center plane is Q11, and the vertical distance between the rotation axis of the shaft body of the second main swing arm and the center plane is Q21, wherein Q11 is greater than Q21.

10. The rotating shaft device according to any one of claims 4 to 9, characterized in that: When the rotating shaft device switches between the unfolded state and the folded state, the rotation angle of the first main swing arm relative to the shaft seat is greater than the rotation angle of the second main swing arm relative to the shaft seat.

11. The rotating shaft device according to any one of claims 1 to 10, characterized in that: The first swing arm assembly includes a first auxiliary swing arm and a first main swing arm, the second swing arm assembly includes a second auxiliary swing arm and a second main swing arm, the first auxiliary swing arm and the second auxiliary swing arm are respectively rotatably connected to the shaft seat, the first auxiliary swing arm is slidably connected to the first adapter plate, the second auxiliary swing arm is slidably connected to the second adapter plate, the first main swing arm and the second main swing arm are respectively rotatably connected to the shaft seat, the rotation axis of the first auxiliary swing arm relative to the shaft seat does not coincide with the rotation axis of the first main swing arm relative to the shaft seat, and the rotation axis of the second auxiliary swing arm relative to the shaft seat does not coincide with the rotation axis of the second main swing arm relative to the shaft seat.

12. The rotating shaft device according to any one of claims 1 to 11, characterized in that: The first swing arm assembly includes a first auxiliary swing arm, the second swing arm assembly includes a second auxiliary swing arm, the first auxiliary swing arm is slidably connected to the first door panel, and the second auxiliary swing arm is slidably connected to the second door panel.

13. The rotating shaft device according to claim 12, characterized in that: The first auxiliary swing arm and the second auxiliary swing arm both include a shaft body, and the first door panel and the second door panel are both provided with a guide groove. The shaft body of the first auxiliary swing arm slides in conjunction with the guide groove of the first door panel, and the shaft body of the second auxiliary swing arm slides in conjunction with the guide groove of the second door panel.

14. The rotating shaft device according to any one of claims 1 to 13, characterized in that: The first swing arm assembly includes a first auxiliary swing arm, and the second swing arm assembly includes a second auxiliary swing arm. The first auxiliary swing arm and the second auxiliary swing arm are respectively rotatably connected to the axle seat. When the rotating shaft device is in an expanded state, the distance between the rotation axis of the first auxiliary swing arm relative to the axle seat and the load-bearing plane is F1, and the distance between the rotation axis of the second auxiliary swing arm relative to the axle seat and the load-bearing plane is F2, wherein F1 is equal to F2.

15. A folding screen device, characterized in that: include: The rotating shaft device according to any one of claims 1 to 14; Shell components are respectively provided on both sides of the shaft seat, and the shell components on both sides of the shaft seat are respectively connected to the first adapter plate and the second adapter plate.

16. The folding screen device according to claim 15, characterized in that: The thickness of the shell component connected to the first adapter plate is greater than the thickness of the shell component connected to the second adapter plate.

17. The folding screen device according to claim 15 or 16, characterized in that: The foldable screen device further includes a flexible display screen, the flexible display screen including a first connecting section, a first bendable section, a second bendable section, and a second connecting section, which are sequentially distributed, and the first connecting section and the second connecting section are respectively connected to the shell components on both sides of the hinge device; In which, the rotating shaft device is used to drive the first bendable section and the second bendable section to switch between the unfolded state and the folded state. When the flexible display screen is in the folded state, the first bendable section and the second bendable section are asymmetrically arranged. The first bendable section includes a first inner bend portion, a first transition portion and a first outer bend portion distributed in sequence. The first outer bend portion is connected to the first connecting section. The first supporting plane of the first door panel supports the first transition portion. The first inner bend portion is arranged close to the axle seat. The second bendable section includes a second inner bend portion, a second transition portion and a second outer bend portion distributed in sequence. The second inner bend portion is arranged close to the axle seat. The first inner bend portion is connected to the second inner bend portion. The second supporting plane supports the second transition portion. The second outer bend portion is connected to the second connecting section.

18. The folding screen device according to claim 17, characterized in that: When the flexible display screen is in a folded state, the angle between the light-emitting surface of the first transition portion and the light-emitting surface of the first connecting segment is A1, and the angle between the light-emitting surface of the second transition portion and the light-emitting surface of the second connecting segment is A2, wherein A1 is greater than A2.

19. The folding screen device according to claim 18, characterized in that: When the flexible display screen is in a folded state, the vertical distance between the bending axis of the first inner curved portion and the light-emitting surface of the first connecting segment is B1, and the vertical distance between the bending axis of the first inner curved portion and the light-emitting surface of the second connecting segment is B2, wherein B1 is equal to B2, or B1 is less than B2.

20. The folding screen device according to claim 18 or 19, characterized in that: When the flexible display screen is in a folded state, the radius of the first inner curved portion is equal to the radius of the second inner curved portion.

21. The folding screen device according to claim 19, characterized in that: The folding screen device also includes a metal support backplane, which is located on the backlight side of the flexible display screen. The metal support backplane includes a first area and a second area, the first area is arranged corresponding to the first outer bend, and the second area is arranged corresponding to the second outer bend. The first area and the second area are respectively provided with a first groove and a second groove on the surface facing the shell component. When the metal support backplane is in an unfolded state, the metal support backplane has a center line, the minimum vertical distance between the first area and the center line is J1, and the minimum vertical distance between the second area and the center line is J2, wherein J1 is greater than J2.

22. The folding screen device according to claim 21, characterized in that: The width of the first region is greater than the width of the second region, the number of the first slots is greater than the number of the second slots, and the width of the first slots is smaller than the width of the second slots.

23. The folding screen device according to claim 21 or 22, characterized in that: The metal support back plate includes a third area and a fourth area, the third area is set corresponding to the first inner bend portion, and the fourth area is set corresponding to the second inner bend portion. The third area and the fourth area are respectively provided with a first hollow hole and a second hollow hole, the minimum vertical distance between the third area and the center line is L1, and the minimum vertical distance between the fourth area and the center line is L2, wherein L1 is greater than L2.

24. The folding screen device according to claim 23, characterized in that: The width of the third region is greater than the width of the fourth region, the number of the first hollow holes is greater than the number of the second hollow holes, and the aperture of the first hollow holes is smaller than the aperture of the second hollow holes.

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