Folding device and electronic device

Abstract

To disclose a folding equipment and an electronic device.SOLUTION: An electronic device comprises folding equipment and a flexible display. The folding equipment is configured to carry the flexible display. An elastic body of the folding equipment can transfer an elastic force to the flexible display using a housing of the folding equipment. When the electronic device is in a flat state, a force separated from a main shaft and applied to the flexible display and is larger than a force separated from the main shaft and applied to the flexible display when the electronic device is in a close state. Thus, when unfolding the electronic device from the folding state to the flat state, stacking misalignment of the flexible display can be reduced and recovery of wrinkles of the flexible display can be promoted, thus enhancing the flattening effect of the flexible display.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] This application claims priority to Chinese Patent Application No. 202010959362.9, entitled "FOLDING STRUCTURE AND ELECTRONIC DEVICE", filed with the China National Intellectual Property Administration on September 14, 2020, and Chinese Patent Application No. 202011495418.6, entitled "FOLDING STRUCTURE AND ELECTRONIC DEVICE", filed with the China National Intellectual Property Administration on December 17, 2020, and these documents are hereby incorporated by reference in their entirety.

[0002] This application relates to the field of foldable electronic product technologies, and particularly to folding devices and electronic devices.

Background Art

[0003] Flexible displays are widely applied to various foldable electronic devices due to features such as light weight, thinness, and durability. When the flexible display is in the unfolded state, a relatively large display area can be obtained, thereby enhancing the visual effect. When the flexible display is in the folded state, the electronic device becomes smaller in volume, making it easier for the user to carry. The foldable electronic device further includes a folding device configured to carry the flexible display. The folding device generally includes two housings and a rotation mechanism connected between the two housings. The two housings are folded or unfolded relative to each other by the deformation of the rotation mechanism to fold or unfold the flexible display. However, since tension is generated in the bending area of the flexible display during the bending process, creases appear in the middle part of the flexible display in the unfolded state. As a result, the flatness of the flexible display decreases, affecting the user experience.

Summary of the Invention

[0004] An object of the present application is to provide a folding device and an electronic device. The folding device is configured to carry a flexible display. When the electronic device is unfolded from a folded state to a flat state, the force in a direction away from the main shaft with respect to the flexible display is greater than the force in a direction away from the main shaft with respect to the flexible display in a closed state. Therefore, it is possible to reduce the misalignment phenomenon of the laminated position of the flexible display when the electronic device is unfolded from the folded state to the flat state, promote the recovery of wrinkles of the flexible display, and enhance the flattening effect of the flexible display.

[0005] According to a first aspect, the present application provides a folding device. The folding device can be applied to an electronic device, and the folding device is configured to carry a flexible display of the electronic device. The flexible display includes a first non-bending portion, a bending portion, and a second non-bending portion arranged in sequence. The folding device includes a first housing, a second housing, a first elastic component, and a shaft. The first housing and the second housing are respectively arranged on both sides of the shaft. The first housing is fixedly connected to the first non-bending portion, and the second housing is fixedly connected to the second non-bending portion. The first elastic component is arranged between the shaft and the first housing. The first elastic component is rotatably connected to the shaft and fixedly connected to the first housing. A first mechanical component abuts against a second mechanical component. The first mechanical component is a part of the first elastic component, and the second mechanical component is a part of the shaft. An elastic force is generated by the amount of compression of the first elastic component in a first direction. At least a part of the elastic force is transmitted to the bending portion through the first housing and the first non-bending portion. The first direction is orthogonal to the length extension direction of the shaft, and the first direction is parallel to the first housing. When the electronic device is in a flat state, a first portion of the first mechanical component abuts against a first portion of the second mechanical component, and the amount of compression of the first elastic component in the first direction is a first amount of compression. The first housing and the first elastic component rotate relative to the shaft, the second housing rotates relative to the shaft, and the electronic device changes from a flat state to a folded state. When the electronic device is in a folded state, a second portion of the first mechanical component abuts against a second portion of the second mechanical component, and the amount of compression of the first elastic component in the first direction is a second amount of compression. The second amount of compression is smaller than the first amount of compression. The first portion of the first mechanical component is different from the second portion of the first mechanical component, and / or the first portion of the second mechanical component is different from the second portion of the second mechanical component.

[0006] In this application, since the first housing is fixedly connected to the first non-bending part of the flexible display, when the electronic device is in a flat state, the elastic force generated by the first elastic body can be transmitted to the first non-bending part of the display through the first housing, thereby promoting the recovery of wrinkles of the flexible display and enhancing the flattening effect of the screen.

[0007] In a possible embodiment, when the electronic device is in a flat state, the force transmitted to the bending part by using the first housing and the first non-bending part is the first force. When the electronic device is in a folded state, the force transmitted to the bending part by using the first housing and the first non-bending part is the second force, and the second force is smaller than the first force. Therefore, when the electronic device is unfolded from the folded state to the flat state, the force transmitted to the first non-bending part of the flexible display by using the first housing becomes larger, thereby promoting the recovery of wrinkles.

[0008] In a possible embodiment, the shaft is rotatably connected to the first elastic body by using the first rotating shaft. When the electronic device is in a flat state, the distance between the axis of the first rotating shaft and the first part of the shaft is the first distance, and the projected length of the first distance on the first plane is the first projected length. When the electronic device is in a folded state, the distance between the axis of the first rotating shaft and the second part of the shaft is the second distance, and the projected length of the second distance on the first plane is the second projected length, and the second projected length is shorter than the first projected length. The first plane is the plane in which the surface where the first housing is fixedly connected to the first non-bending part is located.

[0009] In this embodiment, when the electronic device is folded in different states, since the projected lengths of the distances from the contact point to the axes of the first mechanical part and the second mechanical part are different, the elastic deformation amounts (variables) of the first elastic body are different, and the forces transmitted to the flexible display by using the first housing are different.

[0010] In a possible embodiment, a connection hole is provided in the first elastic body, and the shaft is rotatably connected to the first elastic body using the first rotating shaft, which particularly includes that the first rotating shaft is disposed through the connection hole.

[0011] In a possible embodiment, the connection hole includes a first side wall and a second side wall. The distance between the axis of the first rotating shaft and the first side wall is the first distance, the distance between the axis of the first rotating shaft and the second side wall is the second distance, and the first distance is shorter than the second distance. In response to a third force acting on the first elastic body, the connection hole moves relative to the first rotating shaft, the distance between the axis of the first rotating shaft and the first side wall is the third distance, the distance between the axis of the first rotating shaft and the second side wall is the fourth distance, and the third distance is greater than the fourth distance. The direction of the third force is the direction in which the second side wall faces the first side wall, the distance between the first side wall and the first housing is the fifth distance, the distance between the second side wall and the first housing is the sixth distance, and the fifth distance is shorter than the sixth distance.

[0012] In this embodiment, according to the shape design of the connection hole, as the flexible display gradually becomes longer over time, the folding device attaches the flexible display more closely, and when the flexible display ages, the wrinkles of the flexible display become fewer.

[0013] In a possible embodiment, a connection hole is provided in the shaft, and the shaft is rotatably connected to the first elastic body using the first rotating shaft. Specifically, the first rotating shaft is disposed through the connection hole.

[0014] In a possible embodiment, the connection hole includes a first side wall and a second side wall. The distance between the axis of the first rotating shaft and the first side wall is a first distance, the distance between the axis of the first rotating shaft and the second side wall is a second distance, and the first distance is greater than the second distance. In response to a third force acting on the first elastic body, the first rotating shaft moves relative to the connection hole. The distance between the axis of the first rotating shaft and the first side wall is a third distance, and the distance between the axis of the first rotating shaft and the second side wall is a fourth distance. The third distance is shorter than the fourth distance. The direction of the third force is such that the second side wall faces the first side wall. The distance between the first side wall and the first housing is a fifth distance, and the distance between the second side wall and the first housing is a sixth distance. The fifth distance is shorter than the sixth distance.

[0015] In a possible embodiment, the first cross-section of the connection hole includes at least one or a plurality of waist-round shapes, ellipses, circles, or rectangles, and the first cross-section is orthogonal to the length extension direction of the first rotating shaft.

[0016] In a possible embodiment, the first elastic body includes a first fixed bracket, and at least a part of the first fixed bracket is fixedly connected to the first housing.

[0017] In a possible embodiment, the first elastic body further includes a first elastic component and a first bracket. The first elastic component and the first support are arranged on the first fixed bracket. At least a part of the first elastic component is arranged between the first bracket and the first fixed bracket. The first bracket abuts against the second mechanical component, and the first elastic component abuts against the first housing using the first fixed bracket.

[0018] In a possible embodiment, a first mounting groove is provided in the first fixed bracket, and a flange is arranged on the first bracket. The first bracket is slidably connected to the first mounting groove via the flange.

[0019] In a possible embodiment, the folding device further includes a second elastic body. The shaft includes a first rotating portion and a second rotating portion. The first elastic body includes a first fixed bracket, and the second elastic body includes a second fixed bracket. The first rotating portion includes a first connecting component and a first rotating arm. The second rotating portion includes a second connecting component and a second rotating arm. The first connecting component includes a sliding end portion and a rotating end portion. The sliding end portion of the first connecting component is slidably connected to the second fixed bracket, and the rotating end portion of the first connecting component is rotatably connected to the first end portion of the first rotating arm. The second end portion of the first rotating arm is rotatably connected to the first fixed bracket using a first rotating shaft. The second connecting component includes a sliding end portion and a rotating end portion. The sliding end portion of the second connecting component is slidably connected to the first fixed bracket, the rotating end portion of the second connecting component is rotatably connected to the first end portion of the second rotating arm, and the second end portion of the second rotating arm is rotatably connected to the second fixed bracket.

[0020] In a possible embodiment, the first fixed bracket includes a first connecting block. The first connecting block may be in the shape of a claw, and there is a rotating hole in the first connecting block. The first rotating arm includes a claw-shaped first end portion, that is, a second mechanical component, and there is a rotating hole in the first end portion of the first rotating arm. The first end portion of the first rotating arm is connected to the first connecting block in a staggered manner. The rotating shaft passes through the rotating hole of the first connecting block and the rotating hole of the first end portion of the first rotating arm. Therefore, the first end portion of the first rotating arm is rotatably connected to the first connecting block. In this way, the first rotating arm is rotatably connected to the first fixed bracket. Since the first end portion of the first rotating arm is connected to the first connecting block in a staggered manner, the mutual restriction (limiting) between the first end portion of the first rotating arm and the first connecting block is realized in the axial direction of the main shaft, and the reliability of the connection of the rotating mechanism can be improved.

[0021] In a possible embodiment, the second elastic body is disposed between the shaft and the second housing. The second elastic body is rotatably connected to the shaft, and the second elastic body is fixedly connected to the second housing. The third mechanical component abuts against the fourth mechanical component. The third mechanical component is a part of the second elastic body, and the fourth mechanical component is a part of the shaft. An elastic force is generated by the amount of compression of the second elastic body in the second direction. At least a part of the elastic force is transmitted to the bent portion through the second housing and the second non-bent portion. The second direction is orthogonal to the length extension direction of the shaft, and the second direction is parallel to the second housing. The electronic device is in a flat state, the first part of the third mechanical component abuts against the first part of the fourth mechanical component, and the amount of compression of the second elastic body in the second direction is the third amount of compression. The electronic device is in a folded state, the second part of the third mechanical component abuts against the second part of the fourth mechanical component, and the amount of compression of the second elastic body in the second direction is the fourth amount of compression. The fourth amount of compression is smaller than the third amount of compression. The first part of the third mechanical component is different from the second part of the third mechanical component, and / or the first part of the fourth mechanical component is different from the second part of the fourth mechanical component.

[0022] In this embodiment, the second elastic body is arranged such that the second non-bent portion of the flexible display receives a force in the direction away from the main shaft in the flat state, which is greater than the force in the direction away from the main shaft in the closed state. Thereby, when the electronic device is folded and unfolded, the recovery of the wrinkles of the flexible display is promoted. The flattening of the flexible display is improved, and the user experience is improved.

[0023] In a possible embodiment, the shaft further includes a main shaft. The first connecting component includes a first transmission arm and a first connecting piece. The second connecting component includes a second transmission arm and a second connecting piece. The first connecting component includes a sliding end and a rotating end. The sliding end of the first connecting component is slidably connected to the second fixed bracket, and the rotating end of the first connecting component is rotatably connected to the first end of the first rotating arm. Specifically, the first transmission arm includes a sliding end and a rotating end. The sliding end of the first transmission arm is slidably connected to the second fixed bracket, the rotating end of the first transmission arm is rotatably connected to the main shaft, the rotating end of the first transmission arm is rotatably connected to the first connecting piece, and the first connecting piece is rotatably connected to the first end of the first rotating arm. The second connecting component includes a sliding end and a rotating end. The sliding end of the second connecting component is slidably connected to the first fixed bracket, and the rotating end of the second connecting component is rotatably connected to the first end of the second rotating arm. Specifically, the second transmission arm includes a sliding end and a rotating end. The sliding end of the second transmission arm is slidably connected to the first fixed bracket, the rotating end of the second transmission arm is rotatably connected to the main shaft, the rotating end of the second transmission arm is rotatably connected to the second connecting piece, and the second connecting piece is rotatably connected to the first end of the second rotating arm.

[0024] In this embodiment, in the process of relatively unfolding the first housing and the second housing into a flat state, the first transmission arm rotates with respect to the main shaft, the first rotating arm is linked to the first transmission arm using the first connecting piece, and the first fixing bracket and the first housing gradually move away from the main shaft. The second transmission arm rotates with respect to the main shaft, the second rotating arm is connected to the second transmission arm via the second connecting piece, and the second fixing bracket and the second housing gradually move away from the main shaft. In the process of relatively folding the first housing and the second housing into a folded state, the first transmission arm rotates with respect to the main shaft, the first rotating arm is connected to the first transmission arm via the first connecting piece, and the first fixing bracket and the first housing gradually approach the main shaft. The second transmission arm rotates with respect to the main shaft, the second rotating arm is connected to the second transmission arm via the second connecting piece, and the second fixing bracket and the second housing gradually approach the main shaft. Therefore, in the process of relatively unfolding the first housing and the second housing, the first housing moves in a direction away from the main shaft, and the second housing moves in a direction away from the main shaft. In the process of relatively folding the first housing and the second housing, the first housing moves in a direction approaching the main shaft, and the second housing moves in a direction approaching the main shaft. That is, the inward pulling operation of the housing in the process of changing the folding device from a flat state to a closed state and the outward pushing operation of the housing in the process of changing the folding device from a closed state to a flat state can be realized as the folding device is in the process of unfolding or folding. The deformation movement using the flexible display as the neutral plane can be realized, thereby reducing the risk of pulling or compressing the flexible display, thereby enabling the flexible display to maintain a certain length, protecting the flexible display, improving the reliability of the flexible display, and extending the service life of the flexible display and the electronic device.

[0025] In a possible embodiment, the main shaft includes an inner shaft and an outer shaft, and the outer shaft is fixedly connected to the inner shaft. The inner shaft includes a first arc-shaped protrusion and a second arc-shaped protrusion, the outer shaft includes a first arc-shaped groove and a second arc-shaped groove, the rotating end of the first transmission arm is arc-shaped, and is rotatably connected to the first arc-shaped protrusion and the first arc-shaped groove, the rotating end of the second transmission arm is arc-shaped, and is rotatably connected to the second arc-shaped protrusion and the second arc-shaped groove.

[0026] In this embodiment, the first transmission arm is connected to the main shaft, and the second transmission arm is connected to the main shaft using a virtual shaft. The rotational connection structure is simple, occupies a small space, helps to reduce the thickness of the rotation mechanism, and facilitates the weight reduction and thinning of the folding device and the electronic device.

[0027] In a possible embodiment, the main shaft includes an inner shaft and an outer shaft fixed to the inner shaft. When the first housing and the second housing are folded and closed relative to each other, the inner shaft is located between the outer shaft and the first fixing bracket and the second fixing bracket. The first transmission arm rotates around a first rotation center, the first rotation center is close to the inner shaft and away from the outer shaft, and the first rotation center is close to the second fixing bracket and away from the first fixing bracket. The second transmission arm rotates around a second rotation center, the second rotation center is close to the inner shaft and away from the outer shaft, and the second rotation center is close to the first fixing bracket and away from the second fixing bracket.

[0028] In this embodiment, since the positions of the first rotation center and the second rotation center are set, when the folding device switches from a flat state to a closed state, the rotation mechanism can more easily pull in the housing, and when the folding device switches from a closed state to a flat state, it can more easily push out the housing, thereby realizing a deformation using the flexible display as a neutral plane.

[0029] In addition, a plurality of three-dimensional space structures are provided on both the inner shaft line and the outer shaft. Through the design of these structures, the inner shaft and the outer shaft can form a plurality of movable spaces together after being assembled. The structural part of the rotating mechanism is movably installed in the plurality of movable spaces of the main shaft, thereby realizing the connection with the main shaft. The split design of the inner shaft and the outer shaft helps to reduce the manufacturing difficulty of the main shaft and improve the manufacturing accuracy and product yield of the main shaft.

[0030] In a possible embodiment, the rotating end of the first transmission arm can further include a limiting protrusion, and the limiting protrusion forms an inner position and / or an outer position of the rotating end. The limiting protrusion is configured to cooperate with the limiting groove of the main shaft, so that the first transmission arm and the main shaft realize mutual restriction in the axial direction of the main shaft, improving the reliability of the connection structure.

[0031] In a possible embodiment, the first rotating arm is connected to the first connecting piece using the second rotating shaft. The inner shaft and the outer shaft surround to form an arc-shaped groove, and the second rotating shaft and the arc-shaped groove are slidably matched to limit the moving orbit of the second rotating shaft so that the first rotating arm can move inside the main shaft using only a predetermined orbit.

[0032] In a possible embodiment, the second fixed bracket includes a first sliding groove, and the first fixed bracket includes a second sliding groove. The slidable connection of the sliding end of the first transmission arm to the second fixed bracket particularly includes the slidable connection of the sliding end of the first transmission arm to the first sliding groove, and during the process of the electronic device switching from a flat state to a folded state, the sliding end of the first transmission arm is slidably connected to the first sliding groove. The slidable connection of the sliding end of the second transmission arm to the first fixed bracket particularly includes the slidable connection of the sliding end of the second transmission arm to the second sliding groove, and during the process of the electronic device changing from a flat state to a folded state, the sliding end of the second transmission arm is slidably connected to the second sliding groove.

[0033] In a possible embodiment, there may be a guide space recessed in the side wall of the first sliding groove. Since the sliding end of the first transmission arm is attached to the first sliding groove, the sliding end of the first transmission arm is slidably connected to the second fixed bracket. The sliding end of the first transmission arm includes a first flange located on the outer peripheral side. The first flange is attached to the guide space of the first sliding groove. In this embodiment, the guide space of the first sliding groove can cooperate with the first flange of the first transmission arm, thereby guiding the sliding end of the first transmission arm in the sliding direction of the first sliding groove. In this way, the relative sliding operation between the first transmission arm and the second fixed bracket can be more easily implemented, and the control accuracy is higher.

[0034] In a possible embodiment, there may be a guide space recessed in the side wall of the second sliding groove. The sliding end portion of the second transmission arm is installed in the second sliding groove so as to slidably connect with the first fixed bracket. The sliding end portion of the second driving arm includes a second flange on the outer peripheral side. The second flange is installed in the guide space of the second sliding groove. In this embodiment, the guide space of the second sliding groove cooperates with the second flange of the second transmission arm, whereby the sliding end portion of the second transmission arm can be guided in the sliding direction of the second sliding groove. The relative sliding operation between the second transmission arm and the first fixed bracket is easy to realize and has high control accuracy.

[0035] In a possible embodiment, the first transmission arm further includes a first limiting component, and the second transmission arm further includes a second limiting component. The first limiting component is arranged at the sliding end portion of the first transmission arm, and the second limiting component is arranged at the sliding end portion of the second transmission arm. On the side wall of the first sliding groove, a first convex portion and a first concave portion spaced apart from each other are provided, and on the side wall of the second sliding groove, a second convex portion and a second concave portion spaced apart from each other are provided. The first limiting component includes a second elastic component, and the second limiting component includes a third elastic component. The sliding end portion of the first transmission arm slides to a first position relative to the first sliding groove, and the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a fifth compression amount. The sliding end portion of the first transmission arm slides to a second position relative to the first sliding groove, and the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a sixth compression amount, and the fifth compression amount is greater than the sixth compression amount. The sliding end portion of the second transmission arm slides to a third position relative to the second sliding groove, and the second limiting component cooperates with the second convex portion, and the compression amount of the third elastic component is a seventh compression amount. The sliding end portion of the second transmission arm slides to a fourth position relative to the second sliding groove, and the second limiting component cooperates with the second concave portion, and the compression amount of the third elastic component is an eighth compression amount, and the seventh compression amount is greater than the eighth compression amount.

[0036] In this embodiment, by the cooperation between the first limiting component and the first convex part and the first concave part of the first sliding groove, and the cooperation between the second limiting component and the second convex part and the second concave part of the second sliding groove, torque is applied to prevent the relative rotation of the housing, thereby improving the tactile feeling of the electronic device during the folding process. Further, the first limiting component is configured to define the positional relationship between the first transmission arm and the second fixed bracket, and the second limiting component is configured to define the positional relationship between the second transmission arm and the first fixed bracket. Thereby, the first transmission arm and the second fixed bracket can maintain a preset relative positional relationship without a large external force. The second transmission arm and the first fixed bracket can maintain a preset relative positional relationship without a large external force, the folding device can stay at a preset angle, the folding device can maintain a flat state or a closed state, and the user experience of the folding device and the electronic device can be improved.

[0037] In a possible embodiment, a second mounting groove is provided at the sliding end of the first transmission arm, and the first limiting component is mounted in the second mounting groove. The first limiting component includes a second bracket and a second elastic component. The second bracket includes a control component and a holding part. One end of the second elastic component is attached to the control component of the second bracket, the other end of the second elastic component abuts against the groove wall of the second mounting groove, and the holding part of the second bracket is clamped to the second fixed bracket. Since the second elastic component of the first limiting component can be deformed under the action of an external force, the first limiting component can smoothly move between the first convex part and the first concave part with respect to the second fixed bracket, and improve the reliability of the regulation between the first transmission arm and the second fixed bracket.

[0038] In some embodiments, the first limiting component can further include a first cushioning component, and the first cushioning component is attached to the abutting component of the second bracket. The first cushioning component is made of a material with low rigidity (e.g., rubber), and when an external force is applied, the first cushioning component deforms to absorb the impact force, thereby realizing cushioning. In the first limiting component, in order to improve the reliability of the limiting structure, the first cushioning component is arranged to relieve the stress between the abutting component and the second fixing bracket.

[0039] In a possible embodiment, the first transmission arm further includes a first limiting component, and the second transmission arm further includes a second limiting component. The first limiting component is arranged at the sliding end of the first transmission arm, and the second limiting component is arranged at the sliding end of the second transmission arm. On the side wall of the first sliding groove, a first convex portion and a first concave portion spaced apart from each other are provided, and on the side wall of the second sliding groove, a second convex portion and a second concave portion spaced apart from each other are provided. The first convex portion includes a second elastic component, and the second convex portion includes a third elastic component. The sliding end of the first transmission arm slides to a first position relative to the first sliding groove, the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a fifth compression amount. The sliding end of the first transmission arm slides to a second position relative to the first sliding groove, the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a sixth compression amount, and the fifth compression amount is greater than the sixth compression amount. The sliding end of the second transmission arm slides to a third position relative to the second sliding groove, the second limiting component cooperates with the second convex portion, and the compression amount of the third elastic component is a seventh compression amount. The sliding end of the second transmission arm slides to a fourth position relative to the second sliding groove, the second limiting component cooperates with the second concave portion, and the compression amount of the third elastic component is an eighth compression amount, and the seventh compression amount is greater than the eighth compression amount.

[0040] In this embodiment, by the cooperation between the first limiting component and the first convex part and the first concave part of the first sliding groove, and the cooperation between the second limiting component and the second convex part and the second concave part of the second sliding groove, torque that hinders the relative rotation of the housing is applied, and the tactile feeling of the electronic device during the folding process can be improved.

[0041] In a possible embodiment, the folding device further includes a synchronization component. The synchronization component includes a first synchronization swing arm, a second synchronization swing arm, a first gear, and a second gear. The first gear is disposed on the main shaft, and the first gear is rotatably connected to the main shaft. The second gear is disposed on the main shaft, and the second gear is rotatably connected to the main shaft. The first gear meshes with the second gear. The first synchronization swing arm includes a sliding end portion and a rotating end portion. The rotating end portion of the first synchronization swing arm is rotatably connected to the main shaft, the rotating end portion of the first synchronization swing arm engages with the first gear, and the sliding end portion of the first synchronization swing arm is slidably connected to the first fixed bracket. The second synchronization swing arm includes a sliding end portion and a rotating end portion. The rotating end portion of the second synchronization swing arm is rotatably connected to the main shaft, the rotating end portion of the second synchronization swing arm engages with the second gear, and the sliding end portion of the second synchronization swing arm is slidably connected to the second fixed bracket.

[0042] In this embodiment, since the rotating ends of both the first synchronous swing arm and the second synchronous swing arm are rotatably connected to the main shaft, the sliding end of the first synchronous swing arm is slidably connected to the first fixed bracket, and the sliding end of the second synchronous swing arm is slidably connected to the second fixed bracket. Therefore, in the process of relatively deploying or folding the first housing and the second housing, the first synchronous swing arm and the second synchronous swing arm can control the rotation angles of the first fixed bracket and the second fixed bracket relative to the main shaft to be constant, whereby the rotation operations of the first housing and the second housing are synchronized and consistent. The folding operation and the deployment operation of the folding device have better symmetry, which is beneficial to improving the user experience of the user.

[0043] The first synchronous swing arm is rotatably connected to the main shaft and slidably connected to the first fixed bracket, that is, a connecting rod slider structure is formed. The second synchronous swing arm is rotatably connected to the main shaft and slidably connected to the second fixed bracket, that is, a connecting rod slider structure is formed. The two link-slider structures engaging with each other can effectively control the rotation operations of the first housing and the second housing to be synchronized and consistent.

[0044] In this embodiment, it is because the rotating end of the first synchronous swing arm, the first gear, and the second gear are sequentially engaged with the rotating end of the second synchronous swing arm. Therefore, the synchronous assembly formed by the first synchronous swing arm, the second synchronous swing arm, the first gear, and the second gear has a simple structure, is easy to control in the movement process, and has high accuracy.

[0045] In a possible embodiment, the folding device further includes a first connecting cam, a second connecting cam, a fourth elastic component, a snap ring, a snap spring, and a plurality of connecting shafts. The snap ring, the fourth elastic component, the first connecting cam, the synchronization assembly, the second connecting cam, and the snap spring are sequentially sleeved on the plurality of connecting shafts. A first concave surface and a first convex surface are arranged on the first connecting cam, and a second concave surface and a second convex surface are arranged on the side of the synchronization component facing the first connecting cam. The second concave surface and the second convex surface are arranged on the side of the synchronization component facing the first connecting cam and include at least the first synchronization swing arm, or the second synchronization swing arm, or the first gear, or the second gear, or the second concave surface and the second convex surface are arranged on the side of the second gear facing the first connecting cam.

[0046] In a possible embodiment, when the first convex surface coincides with the second convex surface, the shape deformation amount (shape variable) of the fourth elastic component is the first shape deformation amount. The first convex surface coincides with the second concave surface, and the shape change amount of the fourth elastic component is the second shape change amount. The first shape change amount is greater than the second shape change amount.

[0047] In this embodiment, through the cooperation between the arranged plurality of convex surfaces and concave surfaces, torque can be provided to prevent the relative rotation of the first housing and the second housing, thereby improving the touch feeling of the electronic device during the folding process.

[0048] In a possible embodiment, the folding device further includes a third fixed bracket, a fourth fixed bracket, a third transmission arm, and a fourth transmission arm. The third fixed bracket is fixed to the first housing, and the fourth fixed bracket is fixed to the second housing. The third transmission arm includes a sliding end and a rotating end. The sliding end of the third transmission arm is slidably connected to the third fixed bracket, and the rotating end of the third transmission arm is rotatably connected to the shaft. The fourth transmission arm includes a sliding end and a rotating end. The sliding end of the fourth transmission arm is slidably connected to the fourth fixed bracket, and the rotating end of the fourth transmission arm is rotatably connected to the shaft.

[0049] In this embodiment, the third fixed bracket, the fourth fixed bracket, the third transmission arm, and the fourth transmission arm are arranged so that the folding and unfolding of the folding device are made easier.

[0050] In a possible embodiment, the third transmission arm is collinear with the rotation axis of the shaft with respect to rotation, and the second transmission arm is collinear with the rotation axis of the shaft with respect to rotation. The fourth transmission arm is collinear with the rotation axis of the shaft with respect to rotation, and the first transmission arm is collinear with the rotation axis of the shaft with respect to rotation.

[0051] In this embodiment, the rotation axes about which the third transmission arm and the second transmission arm rotate with respect to the main shaft are collinear. The third transmission arm is slidably connected to the third fixed bracket. The rotation axes about which the fourth transmission arm and the first transmission arm rotate with respect to the main shaft are collinear. The fourth transmission arm is slidably connected to the fourth fixed bracket. In this way, the movement of the third transmission arm can be synchronized with the movement of the second transmission arm, and the movement of the fourth transmission arm can be synchronized with the movement of the first transmission arm. Therefore, the structural design and the connection relationship of the rotation mechanism can be simplified, and the reliability of the rotating structure can be improved.

[0052] In a possible embodiment, the rotating mechanism further includes a first support plate and a second support plate. The first support plate is fixedly connected to the sliding end of the second transmission arm, and the second support plate is fixedly connected to the sliding end of the first transmission arm. When the first housing and the second housing are unfolded with respect to each other to a flat state, the first support plate is flush with the second support plate. The first support plate is laid between the first fixed bracket and the main shaft, and the second support plate is laid between the second fixed bracket and the main shaft. When the first housing and the second housing are folded with respect to each other to a closed state, the first support plate is stacked on the side related to the first fixed bracket and away from the second fixed bracket, and the second support plate is stacked on the side related to the second fixed bracket and away from the first fixed bracket.

[0053] In this embodiment, when the first housing and the second housing are unfolded with respect to each other to a flat state, the first support plate, the main shaft, and the second support plate can jointly form a complete planar support for the bending portion of the flexible display. When the first housing and the second housing are folded with respect to each other to a closed state, the first support plate and the second support plate slide and are accommodated with respect to the first housing and the second housing respectively, whereby the main shaft is exposed to form a complete support for the bending portion of the flexible display. In other words, when the folding device is in a flat state or a closed state, the rotating mechanism can completely support the bending portion of the flexible display, so that the flexible display is not easily damaged by the contact of an external force, thereby helping to protect the flexible display and improving the user experience.

[0054] In a possible embodiment, the main shaft has a support surface. When the first housing and the second housing are folded and closed with respect to each other, the support surface of the main shaft is exposed to the first support plate and the second support plate. The support surface of the main shaft is arc-shaped.

[0055] In this embodiment, when the first housing and the second housing are folded and closed with respect to each other, the main shaft can provide a complete semi-circular or substantially semi-circular support effect for the bending portion of the flexible display, which is consistent with the ideal closed shape of the bending portion of the flexible display, so that the closed form of the flexible display can provide optimal support.

[0056] In a possible embodiment, the rotation mechanism further includes a first shielding plate and a second shielding plate. The first shielding plate is fixedly connected to the sliding end of the first transmission arm, and the second shielding plate is fixedly connected to the sliding end of the second transmission arm. The first shielding plate is related to the first transmission arm and is located on the side facing away from the first support plate, and the second shielding plate is related to the second transmission arm and is located on the side facing away from the second support plate.

[0057] When the first housing and the second housing are unfolded and flattened with respect to each other, the first shielding plate is flush with the second shielding plate. The first shielding plate is laid between the first fixed bracket and the main shaft, and the second shielding plate is laid between the second fixed bracket and the main shaft. When the first housing and the second housing are folded and closed with respect to each other, the first shielding plate is located between the first fixed bracket and the first housing, and the second shielding plate is located between the second fixed bracket and the second housing.

[0058] In this embodiment, when the first housing and the second housing are deployed with respect to each other to be in a flat state, the first shielding plate is flush with the second shielding plate. The first shielding plate is laid between the first fixed bracket and the main shaft and can shield the gap between the first fixed bracket and the main shaft. The second shielding plate is laid between the second fixed bracket and the main shaft and can shield the gap between the second fixed bracket and the main shaft. Therefore, the folding device can achieve self-shielding. In this way, not only the appearance quality is improved, but also the risk of dust, debris, etc. from the outside invading the rotating mechanism can be reduced, and the reliability of the folding device can be ensured. When the first housing and the second housing are folded with respect to each other to be in a closed state, the first shielding plate can be accommodated between the first fixed bracket and the first housing, and the second shielding plate can be accommodated between the second fixed bracket and the second housing, so avoidance is achieved. In this way, the folding device can be smoothly folded into a closed form, and the mechanism has high reliability.

[0059] Also, the first support plate and the first shielding plate are fixed to the sliding end of the first transmission arm, and the first support plate and the first shielding plate move together with the sliding end of the first transmission arm. The second support plate and the second shielding plate are fixed to the sliding end of the second transmission arm, and the second support plate and the second shielding plate move together with the sliding end of the second transmission arm. Therefore, when switching the folding device from the closed state to the flat state, or when switching the folding device from the flat state to the closed state, the first support plate and the second support plate gradually approach the main shaft or gradually move away from the main shaft. Thus, the folding device can fully support the flexible display in various forms. In this way, the reliability of the flexible display and the electronic device is improved, and the service life of the flexible display and the electronic device is extended. When switching the folding device from the closed state to the flat state, or when switching the folding device from the flat state to the closed state, the first shielding plate and the second shielding plate gradually approach the main shaft or gradually move away from the main shaft. Thus, folding devices in various forms can adapt to the form of the rotation mechanism and achieve self-shielding. In this way, the reliability of the mechanism is high.

[0060] The first support plate, the first shielding plate, and the second transmission arm are assembled into one component, and the second support plate, the second shielding plate, and the first transmission arm are assembled into one component. Therefore, the second transmission arm can directly control the movement trajectory of the first support plate and the first shielding plate, and the first transmission arm can directly control the movement trajectory of the second support plate and the second shielding plate. In this way, when controlling the movement process of the first support plate, the second support plate, the first shielding plate, and the second shielding plate, the accuracy is high and the hysteresis is small. Therefore, when rotating the folding device, the extending or retracting can be accurately realized to meet the requirements of supporting the flexible display and the self-shielding requirement of the rotation mechanism.

[0061] In a possible embodiment, the main shaft has a shielding surface. When the first housing and the second housing are unfolded and flattened with respect to each other, the shielding surface of the main shaft is exposed with respect to the first shielding plate and the second shielding plate. Therefore, since the first shielding plate, the main shaft, and the second shielding plate can jointly shield the gap between the first housing and the second housing, the rotating mechanism can achieve self-shielding in a flattened state.

[0062] In a possible embodiment, the main shaft further includes a shielding plate, the shielding plate is related to the inner main shaft and is fixed to the side away from the outer main shaft. The shielding surface of the main shaft is formed on the shielding plate and is disposed away from the outer main shaft. In some embodiments, the shielding plate can be mutually fixed to the inner main shaft in an assembly manner. In some other embodiments, the shielding plate and the inner main shaft may instead be integrally formed mechanical components.

[0063] According to a second aspect, the present application provides an electronic device including a flexible display and a folding device according to any one of the foregoing embodiments. The flexible display includes a first non-bending portion, a bending portion, and a second non-bending portion arranged in sequence, the first non-bending portion is fixed to the first housing, and the second non-bending portion is fixed to the second housing. During the process of folding or unfolding the first housing with respect to the second housing, the bending portion is deformed.

[0064] According to a third aspect, the present application provides an electronic device including a flexible display, a first housing, a second housing, a first elastic body, and a shaft. The flexible display includes a first non-bending portion, a bending portion, and a second non-bending portion arranged in sequence. The first housing and the second housing are respectively arranged on both sides of the shaft. The first housing is fixedly connected to the first non-bending portion of the flexible display, and the second housing is fixedly connected to the second non-bending portion of the flexible display. The first elastic body is arranged between the shaft and the first housing. The first elastic body is rotatably connected to the shaft using a first rotating shaft. The first elastic body abuts against a first mechanical component of the shaft, and the first elastic body is fixedly connected to the first housing. When the electronic device is in a flat state, the first elastic body abuts against a first portion of the first mechanical component, the distance between the axis of the first rotating shaft and the first portion is a first distance, the projected length of the first distance on a first plane is a first projected length, and the first plane is the plane where the first housing is fixedly connected to the first non-bending portion. The first housing rotates with respect to the shaft, the second housing rotates with respect to the shaft, and the electronic device changes from a flat state to a folded state. When the electronic device is in a folded state, the first elastic body abuts against a second portion of the first mechanical component, the distance between the axis of the first rotating shaft and the second portion is a second distance, the projected length of the second distance on the first plane is a second projected length, and the second projected length is smaller than the first projected length. The first portion is different from the second portion.

[0065] In a possible embodiment, when the electronic device is in a flat state, the amount of compression of the first elastic body in a first direction is a first amount of compression. The first direction is orthogonal to the length extension direction of the shaft and is parallel to the first housing. When the electronic device is in a folded state, the amount of compression of the first elastic body in the first direction is a second amount of compression, and the second amount of compression is smaller than the first amount of compression.

[0066] Based on the same inventive concept, for the problem-solving principle and beneficial effects of another sub-structure of the electronic device, such as a rotating structure, a main shaft structure, and a limiter for realizing rotation, please refer to the first aspect, possible embodiments of the first aspect, and the beneficial effects brought about by the first aspect. Therefore, for possible embodiments of the electronic device, please refer to the first aspect and possible embodiments of the first aspect. Overlapping parts will not be described again.

[0067] According to a fourth aspect, the present application provides a folding device. The folding device can be applied to an electronic device, and the folding device is configured to carry a flexible display of the electronic device. The flexible display includes a first non-bending part, a bending part, and a second non-bending part arranged in sequence. The folding device includes a first housing, a second housing, a first elastic body, and a shaft. The first housing and the second housing are respectively arranged on both sides of the shaft. The first housing is fixedly connected to the first non-bending part of the flexible display, and the second housing is fixedly connected to the second non-bending part of the flexible display. The first elastic body is arranged between the shaft and the first housing. The first elastic body is rotatably connected to the shaft using a first rotating shaft. The first elastic body abuts against a first mechanical part of the shaft, and the first elastic body is fixedly connected to the first housing. When the electronic device is in a flat state, the first elastic body abuts against a first part of the first mechanical part, the distance between the axis of the first rotating shaft and the first part is a first distance, the projected length of the first distance on a first plane is a first projected length, and the first plane is the plane where the surface to which the first housing is fixedly connected to the first non-bending part is located. The first housing rotates relative to the shaft, the second housing rotates relative to the shaft, and the electronic device changes from a flat state to a folded state. When the electronic device is in a folded state, the first elastic body abuts against a second part of the first mechanical part, the distance between the axis of the first rotating shaft and the second part is a second distance, the projected length of the second distance on the first plane is a second projected length, and the second projected length is shorter than the first projected length. The first part is different from the second part.

[0068] In a possible implementation, when the electronic device is in a flat state, the compression amount of the first elastic body in the first direction is the first compression amount, the first direction is perpendicular to the length extension direction of the shaft, and the first direction is parallel to the first housing. When the electronic device is in a folded state, the compression amount of the first elastic body in the first direction is the second compression amount, and the second compression amount is smaller than the first compression amount.

[0069] Based on the same inventive concept, for other partial structures of the folding device, such as the rotation structure, the main shaft structure, and the problem-solving principle and advantageous effects of the stopper for realizing rotation, please refer to the first aspect, the possible implementations of the first aspect, and the beneficial effects brought by the first aspect. Therefore, for the possible implementations of the electronic device, please refer to the first aspect and the possible implementations of the first aspect. The overlapping parts will not be described again.

[0070] In this application, the flexible display can be deployed or folded using a folding device. When the electronic device is in a flat state, the flexible display is in a flat form and can perform full-screen display. Therefore, the electronic device has a large display area, improving the user's viewing experience. When the electronic device is in a closed state, the planar size of the electronic device is small, so it is convenient for the user to carry and place the electronic device.

[0071] Since the electronic device uses the structural design of the first elastic body and the second elastic body, when the electronic device is deployed from the folded state to the flat state, the flexible display receives a force away from the main shaft direction, thereby promoting the recovery of the wrinkles of the flexible display, improving the flatness of the flexible display, and further improving the user experience.

Brief Description of the Drawings

[0072]

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Embodiments for Carrying Out the Invention

[0073] Hereinafter, with reference to the accompanying drawings, the technical solution of the present application will be described. It is obvious that the described embodiments are only a part of all the embodiments of the present application.

[0074] In the description of the embodiments of the present application, " / " means "or" unless otherwise specified. For example, A / B can represent A or B. In this specification, "and / or" only describes the relevant relationship for describing related objects and represents that three relationships can exist. For example, A and / or B may represent the following three cases: when only A exists, when both A and B exist, and when only B exists.

[0075] Terms such as "first" and "second" mentioned below are for illustrative purposes only and should not be construed as indicating relative importance or implying any indication of the amount of technical features shown. Therefore, features limited by "first" or "second" may include one or more features explicitly or implicitly.

[0076] Furthermore, in this application, terms indicating directions such as "center", "front", "rear", "inside", and "outside" are defined with respect to the directions or positions of components schematically arranged in the accompanying drawings. It should be understood that these terms indicating directions are relative concepts used for relative description and clarification, and are not used to indicate or imply that the shown device or component needs to have a specific direction or needs to be constructed and operated in a specific direction. These terms may vary according to the directions in which the components of the accompanying drawings are arranged, and thus cannot be construed as limitations of this application.

[0077] It should be further noted that in the embodiments of this application, the same reference numerals indicate the same components or the same parts. For the same parts in the embodiments of this application, only one part or component with a reference numeral can be used as an example in the figure. It should be understood that the reference numerals can also be applied to other same parts or components.

[0078] Embodiments of the present application provide a folding device and an electronic device. The electronic device includes a folding device and a flexible display fixed to the folding device. The folding device may be deployed in a flat state (also referred to as a deployed state), or may be folded in a closed state (also referred to as a folded state), or may be in an intermediate state between the flat state and the closed state. The flexible display is deployed and folded using the folding device. The flexible display has a multilayer structure, and each layer undergoes different degrees of deformation when bent. When the electronic device is deployed from the closed state to the flat state, the deformation generated by the flexible display requires a recovery time, thereby causing wrinkles in the center of the flexible display. Therefore, the flatness of the flexible display is reduced, affecting the user experience. According to the folding device and the electronic device provided in the embodiments of the present application, wrinkles of the flexible display can be alleviated, the flatness of the flexible display can be improved, and the user experience can be improved.

[0079] Please refer to FIGS. 1 to 6. FIG. 1 is a schematic diagram showing the structure of an electronic device 1000 in a flat state according to an embodiment of the present application. FIG. 2 is a schematic diagram showing the structure of the folding device 100 of the electronic device 1000 shown in FIG. 1 in a flat state. FIG. 3 is a schematic diagram showing the structure of the electronic device 1000 shown in FIG. 1 in an intermediate state. FIG. 4 is a schematic diagram showing the structure of the folding device 100 of the electronic device 1000 shown in FIG. 3 in an intermediate state. FIG. 5 is a schematic diagram showing the structure of the electronic device 1000 shown in FIG. 1 in a closed state. FIG. 6 is a schematic diagram showing the structure of the folding device 100 of the electronic device 1000 shown in FIG. 5 in a closed state. The electronic device 1000 may be a product such as a mobile phone, a tablet computer, or a notebook computer. In this embodiment, an example where the electronic device 1000 is a mobile phone will be used for explanation.

[0080] The electronic device 1000 includes a folding device 100 and a flexible display 200. The folding device 100 includes a first housing 10, a rotation mechanism 20, and a second housing 30 that are connected in sequence. The first housing 10 can include an intermediate frame and a back cover, and the second housing 30 can include an intermediate frame and a back cover. The rotation mechanism 20 is deformable such that the first housing 10 and the second housing 30 rotate around the rotation mechanism 20, and the electronic device 1000 assumes a flat state, an intermediate state, or a closed state. As shown in FIGS. 1 and 2, since the first housing 10 and the second housing 30 can be deployed relative to each other to a flat state, the electronic device 1000 is in a flat state. For example, when the first housing 10 and the second housing 30 are in a flat state, the narrow angle α can be about 180° (some deviation such as 165°, 177°, 185°, etc. is allowed). As shown in FIGS. 3 and 4, since the first housing 10 and the second housing 30 can be rotated (deployed or folded) relative to each other to an intermediate state, the electronic device 1000 is in an intermediate state. As shown in FIGS. 5 and 6, since the first housing 10 and the second housing 30 can be folded relative to each other to a closed state, the electronic device 1000 is in a closed state. For example, when the first housing 10 and the second housing 30 are in a closed state, they can be substantially completely closed and parallel to each other (some deviation is allowed). The intermediate state shown in FIGS. 3 and 4 can be any state between the flat state and the closed state. Therefore, the electronic device 1000 can be switched between a flat state and a closed state by the deformation of the rotation mechanism 20.

[0081] Since the flexible display 200 is fixed to the folding device 100, the flexible display 200 can be deployed or folded using the folding device 100. For example, the flexible display 200 can be joined to the folding device 100 using an adhesive layer. The flexible display 200 includes a first non-bending portion 2001, a bending portion 2002, and a second non-bending portion 2003 that are arranged in sequence. The first non-bending portion 2001 of the flexible display 200 is fixed to the first housing 10, and the second non-bending portion 2003 is fixed to the second housing 30. When the first housing 10 and the second housing 30 are folded or deployed with respect to each other, the bending portion 2002 deforms. As shown in FIG. 1, when the first housing 10 and the second housing 30 are in a flat state, the flexible display 200 is in a flat state and can perform full-screen display. Therefore, the electronic device 1000 has a relatively large display area, improving the user's viewing experience. As shown in FIG. 3, when the first housing 10 and the second housing 30 are in an intermediate state, the flexible display 200 is in an intermediate state between a flat form and a closed form. As shown in FIG. 5, when the first housing 10 and the second housing 30 are in a closed state, the flexible display 200 is in a closed state. When the electronic device 1000 is in a closed state, the flexible display 200 is located outside the folding device 100, and the flexible display 200 can be substantially U-shaped. When the electronic device 1000 is in a closed state, the planar size of the electronic device 1000 is relatively small, which is convenient for the user to carry and store.

[0082] FIG. 1, FIG. 3, and FIG. 5 are schematic diagrams showing the deformation of the rotation mechanism 20 in the process of folding the electronic device 100 from a flat state to a closed state. As shown in FIG. 1, when the electronic device 1000 is in a flat state, the length of the bent portion 2002 of the flexible display 200 is the first length L1, the length of the rotation mechanism 20 is the second length L2, and the first length L1 is equal to the second length L2. As shown in FIG. 3, when the electronic device 1000 is in an intermediate state, the length of the bent portion 2002 of the flexible display 200 is still the first length L1, the rotation mechanism 20 is deformed, and the length changes to the third length L3, and the third length L3 is shorter than the second length L2. As shown in FIG. 5, when the electronic device 1000 is in a closed state, the length of the bent portion 2002 of the flexible display 200 is still the first length L1, the rotation mechanism 20 is deformed, and the length changes to the fourth length L4, and the fourth length L4 is shorter than the third length L3. Therefore, in the process of unfolding or folding the electronic device 1000, the flexible display 200 can maintain a certain length through the deformation of the rotation mechanism 20, thereby reducing the risk of pulling or pressing the flexible display, improving the reliability of the flexible display, and making it possible to extend the service life of the flexible display and the electronic device.

[0083] In some embodiments, the flexible display 200 is configured to display images. For example, the flexible display 200 may be an Organic Light-Emitting Diode (OLED) display, an Active-Matrix Organic Light-Emitting Diode (AMOLED) display, a Mini Organic Light-Emitting Diode display, a Micro Organic Light-Emitting Diode display, a Micro Organic Light-Emitting Diode display, or a Quantum Dot Light Emitting Diode (QLED) display.

[0084] The flexible display 200 has a multilayer structure including, for example, a first electrode layer, a thin dielectric layer, and a second electrode layer. These layers are joined, for example, using an Optical Clear Adhesive (OCA), and the OCA optical adhesive has elasticity. When the flexible display 200 is folded, material tension in each layer accumulates, resulting in a large tension in the direction opposite to the bending direction of the flexible display, and different layers of the flexible display 200 are deformed to different extents. When the flexible display 200 is unfolded from a closed state to a flat state, the deformation caused by the screen requires a recovery time, so wrinkles appear at the position of the bending portion 2002. Therefore, the flatness of the flexible display decreases, affecting the user experience. When the flexible display 200 is repeatedly folded, the deformation generated on the screen becomes difficult to recover, and the problem of screen wrinkles becomes more serious.

[0085] It should be understood that the wrinkles in this embodiment of the present application are the traces remaining on the flexible display after the flexible display is bent and unfolded, and the bending traces do not disappear. The area where the wrinkles are located is the bending area of the flexible display.

[0086] In some embodiments, the electronic device 1000 can further include a plurality of modules (not shown), and the plurality of modules can be housed inside the folding device 100. The plurality of modules of the electronic device 1000 can include, but are not limited to, a main board, a processor, a memory, a battery, a camera module, an earphone module, a speaker module, a microphone module, an antenna module, and a sensor module, etc. The quantity, type, and position of the modules of the electronic device 1000 are not particularly limited in this embodiment of the present application.

[0087] When the user holds the electronic device 1000, it should be understood that the position of the earphone module of the electronic device 1000 can be defined as the upper edge of the electronic device 1000, and the position of the microphone module of the electronic device 1000 can be defined as the lower edge of the electronic device 1000. The two sides of the electronic device 1000 held by the user's left and right hands can be defined as the left and right sides of the electronic device 1000. In some embodiments, the electronic device 1000 can perform left and right folding. In some other embodiments, the electronic device 1000 can be folded in half vertically.

[0088] Please refer to FIGS. 7 to 10 together. FIG. 7 is a schematic exploded view showing a partial structure of the folding device 100 shown in FIG. 2, FIG. 8 is a schematic view showing the structure of the first housing 10 shown in FIG. 7, FIG. 9 is a schematic view showing the structure of the second housing 30 shown in FIG. 7, and FIG. 10 is a schematic exploded view showing a partial structure of the rotation mechanism 20 shown in FIG. 7.

[0089] In some embodiments, as shown in FIG. 7, the rotation mechanism 20 of the folding device 100 includes a main shaft 1, a first end connection component 20a, a second end connection component 20a', an intermediate connection component 20b, a first support plate 21, a second support plate 22, a first shielding plate 23, and a second shielding plate 24.

[0090] As shown in FIG. 7, the main shaft 1 is located between the first housing 10 and the second housing 30. The first end connection component 20a and the second end connection component 20a' are connected to the first housing 10, the main shaft 1, and the second housing 30. The first end connection component 20a and the second end connection component 20a' are spaced apart from each other in the axial direction of the main shaft 1, and the first end connection component 20a and the second end connection component 20a' can be respectively arranged at the ends of the main shaft 1, for example, the upper end and the lower end of the main shaft 1, or can be respectively connected to the upper end and the lower end of the main shaft 1. The intermediate connection component 20b is connected to the first housing 10, the main shaft 1, and the second housing 30. The intermediate connection component 20b can be arranged between the first end connection component 20a and the second end connection component 20a'. See FIG. 10. The first support plate 21 and the second support plate 22 are located on one side of a plurality of connection components (i.e., the first end connection component 20a, the second end connection component 20a', and the intermediate connection component 20b), and the first shielding plate 23 and the second shielding plate 24 are located on the other side of the plurality of connection components (20a, 20a', 20b).

[0091] As shown in FIGS. 7 and 10, in some embodiments, the first support plate 21 is located on the side of the main shaft 1 close to the first housing 10, and the first support plate 21 is connected to the first end connection component 20a and the second end connection component 20a'. In some embodiments, the first support plate 21 may instead be connected to the intermediate connection component 20b. The second support plate 22 is located on the side of the main shaft 1 close to the second housing 30, and the second support plate 22 is connected to the first end connection component 20a and the second end connection component 20a'. In some embodiments, the second support plate 22 may instead be connected to the intermediate connection component 20b.

[0092] As shown in FIGS. 7 and 10, in some embodiments, the first shielding plate 23 is located on the side of the main shaft 1 close to the first housing 10, and the first shielding plate 23 is connected to the first end connection component 20a and the second end connection component 20a'. In some embodiments, the first shielding plate 23 may instead be connected to the intermediate connection component 20b. The second shielding plate 24 is located on the side of the main shaft 1 close to the second housing 30, and the second shielding plate 24 is connected to the first end connection component 20a and the second end connection component 20a'. In some embodiments, the second shielding plate 24 may instead be connected to the intermediate connection component 20b.

[0093] As shown in FIG. 7, the first housing 10 has a first support surface 101, and the first support surface 101 is configured to support the first non-bending portion 2001 of the flexible display 200. The second housing 30 has a second support surface 301, and the second support surface 301 is configured to support the second non-bending portion 2003 of the flexible display 200. When the first housing 10 and the second housing 30 are unfolded relative to each other to a flat state, the first support surface 101 is flush with the second support surface 301, better supporting the flexible display 200, thereby making the flexible display 200 flatter and improving the user experience.

[0094] In some embodiments, as shown in FIG. 8, it relates to the first housing 10 of the folding device 100, and a first positioning plate 102 is provided on the side close to the rotating mechanism 20. The first positioning plate 102 has a plurality of fastening holes 1021, and the first housing 10 and the rotating mechanism 20 are fixed using fasteners. The fasteners of the folding device 100 are not shown in the accompanying drawings of the present application in order to simplify the drawings and more clearly show the main structure of the folding device 100. The first housing 10 has a first support surface 101, and the first positioning plate 102 descends with respect to the first support surface 101 to form a first receiving groove 103. The first receiving groove 103 can provide a receiving and movable space for the first support plate 21. Due to the position of the first receiving groove 103, the support surface of the first support plate 21 installed in the first receiving groove 103 can be flush with the first support surface 101 of the first housing 10, so the first support plate 21 can better support the flexible display 200. The depth of the first receiving groove 103 is very shallow, and a relatively hard support plate is arranged on the non-display side of the flexible display 200. Therefore, when the first support plate 21 partially protrudes from the first receiving groove 103, the part related to the flexible display 200 and facing the first receiving groove 103 will not be obviously deformed by the user's pressing, which also helps to ensure the reliability of the flexible display 200.

[0095] For example, the first positioning plate 102 may include a plurality of structures spaced apart from each other, or may be a continuous structure. This is not strictly limited in the present application.

[0096] In some embodiments, as shown in FIG. 9, it relates to the second housing 30, and a second positioning plate 302 is provided on the side close to the rotating mechanism 20. A plurality of fastening holes 3021 are provided in the second positioning plate 302. The second housing 30 and the rotating mechanism 20 are fixed using fasteners. The second housing 30 has a second support surface 301, and the second positioning plate 302 descends relative to the second support surface 301 to form a second receiving groove 303. The second receiving groove 303 can provide a receiving and movable space for the second support plate 22. Depending on the position of the second receiving groove 303, the support surface of the second support plate 22 installed in the second receiving groove 303 can be flush with the second support surface 301 of the second housing 30, whereby the second support plate 22 can better support the flexible display 200. The depth of the second receiving groove 303 is very shallow, and a relatively hard support plate is arranged on the non-display side of the flexible display 200. Therefore, when the second support plate 22 partially protrudes from the second receiving groove 303, the part related to the flexible display 200 and facing the second receiving groove 303 will not be visibly deformed by the user's pressing, which also helps to ensure the reliability of the flexible display 200.

[0097] For example, the second positioning plate 302 may include a plurality of structures spaced apart from each other, or may be a continuous structure. This is not strictly limited in the present application.

[0098] As shown in FIG. 7, the main shaft 1 has a support surface 11. As shown in FIGS. 1 and 2, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the support surface 11 of the main shaft 1 is at least partially exposed with respect to the first support plate 21 and the second support plate 22. The first support plate 21, the main shaft 1, and the second support plate 22 can jointly support the bent portion 2002 of the flexible display 200, so that the flexible display 200 becomes flatter, is not easily damaged by the contact of an external force, and the reliability of the flexible display 200 is improved. As shown in FIGS. 3 and 4, when the first housing 10 and the second housing 30 are in an intermediate state, the support surface 11 of the main shaft 1 is partially exposed with respect to the first support plate 21 and the second support plate 22, and the exposed area of the support surface 11 of the main shaft 1 is larger than the exposed area in the flat state. The support surface 11 of the main shaft 1, the first support plate 21, and the second support plate 22 jointly support the bent portion 2002 of the flexible display 200. As shown in FIGS. 5 and 6, when the first housing 10 and the second housing 30 are folded in a closed state, the support surface 11 of the main shaft 1 is basically completely exposed with respect to the first support plate 21 and the second support plate 22, and the support surface 11 of the main shaft 1 supports the bent portion 2002 of the flexible display 200.

[0099] For example, the support surface 11 of the main shaft 1 is arc-shaped. In this case, when the first housing 10 and the second housing 30 are relatively folded and closed, the support surface 11 of the main shaft 1 can provide a complete semi-circular or substantially semi-circular support effect for the bent portion 2002 of the flexible display 200, which is consistent with the ideal closed form of the bent portion 2002 of the flexible display 200. Therefore, more optimized support can be provided for the flexible display 200 in the closed form. In this embodiment of the present application, the support surface 11 of the main shaft 1 may be arc-shaped or substantially arc-shaped.

[0100] In some embodiments, the support surface 11 of the main shaft 1 is arc-shaped, and the central angle of the support surface 11 can be in the range of 150° to 180° in order to better support the flexible display 200. In some other embodiments, the central region of the support surface 11 of the main shaft 1 is a plane, and the regions on both sides of the support surface 11 are arc-shaped surfaces. In this case, the support surface 11 is generally arc-shaped as a whole, and can realize a semi-circular or substantially semi-circular support for the flexible display 200 in a closed state. The central region of the support surface 11, together with the first support plate 21 and the second support plate 22, can realize the planar support of the flat flexible display 200. In some other embodiments, the support surface 11 of the main shaft 1 may alternatively have another shape. For example, by making the support surface 11 of the main shaft 1 semi-elliptical, the width of the folding device 100 can be reduced when the folding device 100 is in a closed state, thereby making it more convenient to carry and arrange the folding device 100. The shape of the support surface 11 of the main shaft 1 is not strictly limited in this embodiment of the present application.

[0101] FIG. 11 is a schematic exploded view showing a partial structure of the folding device 100 shown in FIG. 2.

[0102] As shown in FIG. 11, in some embodiments, the main shaft 1 includes an outer main shaft 14, an inner main shaft 15, and a shielding plate 16. The outer main shaft 14 is fixed to one side of the inner main shaft 15, and the shielding plate 16 is fixed to the other side of the inner main shaft 15. The support surface 11 of the main shaft 1 is formed on the outer main shaft 14 and is disposed away from the inner main shaft 15. The shielding surface 12 of the main shaft 1 is formed on the shielding plate 16 and is disposed away from the outer main shaft 14. In some embodiments, the shielding plate 16 and the inner main shaft 15 can be fixed to each other in an assembly manner. In some other embodiments, the shielding plate 16 and the inner main shaft 15 may alternatively be integrally formed mechanical parts.

[0103] Both the outer main shaft 14 and the inner main shaft 15 form a plurality of movable spaces communicating with the outside of the main shaft 1, and a plurality of connecting components (20a, 20a', 20b) of the rotating mechanism 20 are movably mounted within these movable spaces and are connected to the main shaft 1. The rotating shaft of the entire rotating mechanism 20 is parallel to the axial direction of the main shaft 1 and extends in the axial direction of the main shaft 1.

[0104] In some embodiments, the first end connection component 20a and the second end connection component 20a' have a mirror-symmetric structure. Since the two end connection assemblies 20a and 20a' are arranged in mirror symmetry, the stress between the two end connection assemblies 20a and 20a' and the main shaft 1, the first housing 10, and the second housing 30 is relatively uniform during the rotation of the folding device 100. It is beneficial to improve the reliability of the folding device 100. In this case, since the structures of the two end connection components 20a and 20a' are symmetric, the overall structure of the rotating mechanism 20 is relatively simple and the manufacturing cost is low. In some other embodiments, the two end connection components 20a, 20a' may also be the same or have a centrosymmetric structure, or the two end connection components 20a, 20a' may have different structures.

[0105] The structure of the intermediate connection component 20b is simpler than the structures of the end connection components 20a and 20a'. In some other embodiments, the rotation mechanism 20 may not be provided with the intermediate connection component 20b. In some other embodiments, instead, the rotation mechanism 20 can use the structure of the end connection component 20a / 20a' shown in FIG. 11 for the connection component located in the middle, and can use the structure of the intermediate connection component 20b shown in FIG. 11 for the connection component located at the end. In some other embodiments, in this embodiment of the present application, only one end connection component 20a / 20a' may be arranged, and the end connection component 20a / 20a' is connected to the middle part of the main shaft 1 and the middle parts of the first housing 10 and the second housing 30. It will be understood that the structure of the rotation mechanism 20 may have multiple combinations and deformation methods. This is not strictly limited in this embodiment of the present application.

[0106] Please refer to FIGS. 12, 13, and 14 together. FIG. 12 is a schematic diagram showing the structure of the first end connection component 20a shown in FIG. 11, FIG. 13 is a schematic exploded view showing a partial structure of the first end connection component 20a shown in FIG. 12, and FIG. 14 is a schematic exploded view showing the partial structure of the first end connection component 20a shown in FIG. 12 from another angle.

[0107] In some embodiments, as shown in FIG. 12, the first end connection component 20a of the rotation mechanism 20 can include a first fixed bracket 31, a second fixed bracket 32, a first rotating part, and a second rotating part. The first rotating part can include a first transmission arm 41, a first rotating arm 51, and a first connection piece 61, and the second rotating part can include a second transmission arm 42, a second rotating arm 52, and a second connection piece 62. The first fixed bracket 31, the first rotating arm 51, the first connection piece 61, and the first transmission arm 41 are sequentially connected to the second fixed bracket 32, and the first fixed bracket 31, the second transmission arm 42, the second connection piece 62, and the second rotating arm 52 are sequentially connected to the second fixed bracket 32. The shaft can include the main shaft 1, the first rotating part, and the second rotating part.

[0108] For example, as shown in FIG. 13, the first transmission arm 41 includes a sliding end portion 411 and a rotating end portion 412. The sliding end portion 411 of the first transmission arm 41 is slidably connected to the second fixed bracket 32, and the rotating end portion 412 of the first transmission arm 41 is rotatably connected to the first end portion 611 of the first connection piece 61. The first rotating arm 51 includes a claw-shaped first end portion 511 (the second mechanism portion) and a claw-shaped second end portion 512. The first end portion 511 of the first rotating arm 51 is rotatably connected to the first fixed bracket 31, and the second end portion 512 of the first rotating arm 51 is rotatably connected to the second end portion 612 of the first connection piece 61. The second transmission arm 42 includes a sliding end portion 421 and a rotating end portion 422. The sliding end portion 421 of the second transmission arm 42 is slidably connected to the first fixed bracket 31, and the rotating end portion 422 of the second transmission arm 42 is rotatably connected to the first end portion 621 of the second connection piece 62. The second rotating arm 52 includes a claw-shaped first end portion 521 and a claw-shaped second end portion 522. The first end portion 521 of the second rotating arm 52 is rotatably connected to the second fixed bracket 32, and the second end portion 522 of the second rotating arm 52 is rotatably connected to the second end portion 622 of the second connection piece 62.

[0109] In some embodiments, as shown in FIG. 14, the first fixed bracket 31 includes a first connection block 311. The first connection block 311 may be in a claw shape, and the first connection block 311 has a rotation hole 3111. The first end 511 of the first rotating arm 51, that is, the second mechanism part, has a rotation hole 5111. The first end 511 of the first rotating arm 51 is alternately connected to the first connection block 311, and the rotating shaft 5112 passes through the connection hole 5111 of the first rotating arm 51 and the connection hole 3111 of the first connection block 311 to connect the first end 511 of the first rotating arm 51 and the first connection block 311 of the first fixed bracket 31. A connection is implemented to realize a rotational connection between the first rotating arm 51 and the first fixed bracket 31. Since the first end 511 of the first rotating arm 51 and the first connection block 311 are alternately connected, mutual restriction in the axial direction of the main shaft 1 is realized, and the reliability of the connection of the rotation mechanism 20 is improved. For example, the rotating shaft in this embodiment of the present application may be a pin. The first connection block 311 of the first fixed bracket 31 and the first end 511 of the first rotating arm 51 may alternatively have other structures on the condition that they can satisfy the rotatable connection relationship between the first connection block 311 of the first fixed bracket and the first end 511 of the first rotating arm 51. It will be understood that this is not strictly limited in this embodiment of the present application.

[0110] In some embodiments, as shown in FIGS. 13 and 14, the second end 612 of the first connection piece 61 is in a claw shape, and the second end 512 of the first rotating arm 51 is alternately connected to the second end 612 of the first connection piece 61 using a rotating shaft 6121. In this way, the first rotating arm 51 and the first connection piece 61 are rotatably connected. The first end 611 of the first connection piece 61 is in a claw shape, the end of the rotating end 412 of the first transmission arm 41 is in a claw shape, and the first end 611 of the first connection piece 61 is alternately connected to the end of the rotating end 412 of the first transmission arm 41 using a rotating shaft 6111. In this way, the first connection piece 61 and the first transmission arm 41 are rotatably connected. Since the second end 512 of the first rotating arm 51 is alternately connected to the second end 612 of the first connection piece 61, and the first end 611 of the first connection piece 61 is alternately connected to the end of the rotating end 412 of the first transmission arm 41, mutual regulation in the axial direction of the main shaft 1 can be achieved, thereby improving the reliability of the connection of the rotation mechanism 20. The second end 512 of the first rotating arm 51, the first end 612 of the first connection piece 61, the first end 611 of the first connection piece 61, and the rotating end 412 of the first transmission arm 41 may have other structures as long as they can satisfy the rotational connection relationship between the two (both). This is not strictly limited in this embodiment of the present application.

[0111] In some embodiments, as shown in FIG. 14, the second fixed bracket 32 includes a second connection block 321. The second connection block 321 may be in a claw shape, and the second connection block 321 has a rotation hole 3211. The first end 521 of the second rotating arm 52 has a rotation hole 5211. The first end 521 of the second rotating arm 52 is alternately connected to the second connection block 321, and the rotating shaft 5212 connects the connection hole 5211 of the second rotating arm 52 and the connection hole 3211 of the second connection block 321 through the connection hole 5211 of the first end 521 of the second rotating arm 52 and the second connection block 321 of the second fixed bracket 32, thereby realizing a rotational connection between the second rotating arm 52 and the second fixed bracket 32. Since the first end 521 of the second rotating arm 52 and the second connection block 321 are alternately connected, mutual restriction in the axial direction of the main shaft 1 can be realized, and the reliability of the connection of the rotation mechanism 20 is improved. For example, the rotating shaft in this embodiment of the present application may be a pin. The second connection block 321 of the second fixed bracket 32 and the first end 521 of the second rotating arm 52 may alternatively have other structures, provided that the rotatable connection relationship between the second connection block 321 of the second fixed bracket 32 and the first end 521 of the second rotating arm 52 can be satisfied. This is not strictly limited in this embodiment of the present application.

[0112] In some embodiments, as shown in FIGS. 13 and 14, the second end 622 of the second connection piece 62 is in a claw shape, and the second end 522 of the second rotating arm 52 is alternately connected to the second end 622 of the second connection piece 62 using a rotating shaft 6221. In this way, a rotational connection between the second rotating arm 52 and the second connection piece 62 is realized. The first end 621 of the second connection piece 62 is in a claw shape, the end of the rotating end 422 of the second transmission arm 42 is in a claw shape, and the first end 621 of the second connection piece 62 is alternately connected to the end of the rotating end 422 of the second transmission arm 42 using a rotating shaft 6221. In this way, the second connection piece 62 and the second transmission arm 42 are rotatably connected. Since the second end 522 of the second rotating arm 52 is alternately connected to the second end 622 of the second connection piece 62, and the first end 621 of the second connection piece 62 is alternately connected to the end of the rotating end 422 of the second transmission arm 42, mutual regulation in the axial direction of the main shaft 1 can be realized, thereby improving the reliability of the connection of the rotation mechanism 20. It will be understood that the second end 522 of the second rotating arm 52, the second end 622 of the second connection piece 62, the first end 621 of the second connection piece 62, and the rotating end 422 of the second transmission arm 42 may have other structures as long as they can satisfy the rotational connection relationship between the two (both). This is not strictly limited in this embodiment of the present application.

[0113] In some embodiments, as shown in FIG. 14, the second fixed bracket 32 has a first sliding groove 322, and the side wall of the first sliding groove 322 may have a recessed guide space 3221. The sliding end 411 of the first transmission arm 41 includes a first flange 4111 located on the outer peripheral side. Since the first flange 4111 is installed in the guide space 3221 of the first sliding groove 322, the sliding end 411 of the first transmission arm 41 is slidably connected to the first sliding groove 322. Therefore, the sliding connection between the first transmission arm 41 and the second fixed bracket 32 is realized. In this embodiment, the guide space 3221 of the first sliding groove 322 cooperates with the first flange 4111 of the first transmission arm 41 to guide the sliding end 411 of the first transmission arm 41 in the sliding direction of the first sliding groove 322. Therefore, the relative sliding movement between the first transmission arm 41 and the second fixed bracket 32 is more easily implemented, and the control accuracy is higher.

[0114] In some embodiments, as shown in FIG. 14, the first fixed bracket 31 has a second sliding groove 312, and the side wall of the second sliding groove 312 may have a recessed guide space 3121. The sliding end 421 of the second transmission arm 42 includes a second flange 4211 located on the outer peripheral side. Since the second flange 4211 is installed in the guide space 3121 of the second sliding groove 312, the sliding end 421 of the second transmission arm 42 is slidably connected to the second sliding groove 312. Therefore, the sliding connection between the second transmission arm 42 and the first fixed bracket 31 is realized. In this embodiment, the guide space 3121 of the second sliding groove 312 cooperates with the second flange 4211 of the second transmission arm 42 to guide the sliding end 421 of the second transmission arm 42 in the sliding direction of the second sliding groove 312. Therefore, the relative sliding movement between the second transmission arm 42 and the first fixed bracket 31 is more easily implemented, and the control accuracy is higher.

[0115] The positions of the plurality of sliding grooves on the first fixed bracket 31 may be different from the positions of the plurality of sliding grooves on the second fixed bracket 32. For example, as shown in FIG. 13, the sliding groove 312 and the sliding groove 322 may be arranged in an alternating direction parallel to the axial direction of the main shaft 1 in order to enhance the space utilization of the rotating mechanism 20.

[0116] In some embodiments, as shown in FIGS. 12 to 14, the rotating mechanism 20 may further include a synchronous damping member 7. As shown in FIG. 14, the synchronous damping member 7 includes a first synchronous swing arm 71, a second synchronous swing arm 72, and a gear set 73. The first synchronous swing arm 71 includes a sliding end portion 711 and a rotating end portion 712. The rotating end portion 712 of the first synchronous swing arm 71 is rotatably connected to the main shaft 1, and the sliding end portion 711 of the first synchronous swing arm 71 is slidably connected to the first fixed bracket 31. In the process of relatively folding or unfolding the first housing 10 and the second housing 30, the sliding end portion 711 of the first synchronous swing arm 71 slides relative to the first fixed bracket 31. The second synchronous swing arm 72 includes a sliding end portion 721 and a rotating end portion 722. The rotating end portion 722 of the second synchronous swing arm 72 is rotatably connected to the main shaft 1, and the sliding end portion 721 of the second synchronous swing arm 72 is slidably connected to the second fixed bracket 32. In the process of relatively folding or unfolding the first housing 10 and the second housing 30, the sliding end portion 721 of the second synchronous swing arm 72 slides relative to the second fixed bracket 32.

[0117] In some embodiments, as shown in FIGS. 12 to 14, the first fixed bracket 31 has a third sliding groove 313, and a recessed guide space 3131 may be provided on the side wall of the third sliding groove 313. The guide direction of the guide space 3131 of the third sliding groove 313 is the same as the guide direction of the guide space 3121 of the second sliding groove 312. The sliding end portion 711 of the first synchronous swing arm 71 includes a third flange 7111 located on the outer peripheral side. Since the third flange 7111 is installed in the guide space 3131 of the third sliding groove 313, the sliding end portion 711 of the first synchronous swing arm 71 is slidably connected to the third sliding groove 313. Therefore, the sliding connection between the first synchronous swing arm 71 and the first fixed bracket 31 is realized. In this embodiment, the guide space 3131 of the third sliding groove 313 cooperates with the third flange 7111 of the first synchronous swing arm 71 to guide the sliding end portion 711 of the first synchronous swing arm 71 in the sliding direction of the third sliding groove 313. Therefore, the relative sliding operation between the first synchronous swing arm 71 and the first fixed bracket 31 is more easily implemented, and the control accuracy is higher.

[0118] In some embodiments, as shown in FIGS. 12 to 14, the second fixed bracket 32 has a fourth sliding groove 323, and a recessed guide space 3231 may be provided on the side wall of the fourth sliding groove 323. The guide direction of the guide space 3231 of the fourth sliding groove 323 is the same as the guide direction of the guide space 3221 of the first sliding groove 322. The sliding end portion 721 of the second synchronous swing arm 72 includes a fourth flange 7211 located on the outer peripheral side. Since the fourth flange 7211 is installed in the guide direction of the guide space 3221 of the fourth sliding groove 323, the sliding end portion 721 of the second synchronous swing arm 72 is slidably connected to the fourth sliding groove 323. Therefore, the sliding connection between the second synchronous swing arm 72 and the second fixed bracket 32 is realized. In this embodiment, the guide space 3231 of the fourth sliding groove 323 cooperates with the fourth flange 7211 of the second synchronous swing arm 72 to guide the sliding end portion 721 of the second synchronous swing arm 72 in the sliding direction of the fourth sliding groove 323. Therefore, the relative sliding movement between the second synchronous swing arm 72 and the second fixed bracket 32 can be more easily implemented, and the control accuracy is higher.

[0119] In this embodiment, the rotating end portion 712 of the first synchronous swing arm 71 and the rotating end portion 722 of the second synchronous swing arm 72 are engaged with each other via a gear set 73. Therefore, the synchronous component 70 formed by the first synchronous swing arm 71, the second synchronous swing arm 72, and the gear set 73 has a simple structure, and the control of the moving process is easy and highly accurate.

[0120] For example, the structure of the second synchronous swing arm 72 is substantially the same as the structure of the first synchronous swing arm 71, which can reduce the types of materials of the rotating mechanism 20 and reduce the design difficulty and cost of the rotating mechanism 20.

[0121] As shown in FIGS. 12 to 14, it will be understood that in this embodiment, the first fixed bracket 31 may be an integrally formed mechanical part including a first connection block 311, a second sliding groove 312, and a third sliding groove 313. In some other embodiments, the first fixed bracket 31 includes a plurality of mechanical parts, and the first connection block 311, the second sliding groove 312, and the third sliding groove 313 may be formed of different mechanical parts. This is not strictly limited in the present application. As shown in FIGS. 12 to 14, in this embodiment, the second fixed bracket 32 may be an integrally formed mechanical part including a second connection block 321, a first sliding groove 322, and a fourth sliding groove 323. In some other embodiments, the second fixed bracket 32 includes a plurality of mechanical parts, and the second connection block 321, the first sliding groove 322, and the fourth sliding groove 323 may be formed of different mechanical parts. This is not strictly limited in the present application.

[0122] As shown in FIG. 14, in some embodiments, the first fixed bracket 31 can have a plurality of fastening holes 314. See FIG. 8. The plurality of fastening holes 314 of the first fixed bracket 31 can be aligned with the plurality of fastening holes 1021 of the first positioning plate 102, and the first fixed bracket 31 and the first positioning plate 102 are fixed using a fastener, thereby fixing the first fixed bracket 31 to the first housing 10. Fasteners include, but are not limited to, screws, bolts, rivets, pins, and the like. Since the first fixed bracket 31 and the first housing 10 are fixed to each other, the first housing 10 and the first fixed bracket 31 move synchronously, and the rotation mechanism 20 can control the movement locus of the first housing 10 by controlling the movement locus of the first fixed bracket 31. In some other embodiments, another connection structure may be formed between the first fixed bracket 31 and the first housing 10. This is not strictly limited in the present application.

[0123] As shown in FIG. 14, in some embodiments, the second fixed bracket 32 can have a plurality of fastening holes 324. Referring to FIG. 9, the plurality of fastening holes 324 of the second fixed bracket 32 can be aligned with the plurality of fastening holes 3021 of the second positioning plate 302, and the second fixed bracket 32 and the second positioning plate 302 are fixed using fasteners, thereby fixing the second fixed bracket 32 to the second housing 30. The fasteners include, but are not limited to, screws, bolts, rivets, pins, etc. Since the second fixed bracket 32 and the second housing 30 are fixed to each other, the second housing 30 and the second fixed bracket 32 move synchronously, and the rotation mechanism 20 can control the movement trajectory of the second housing 30 by controlling the movement trajectory of the second fixed bracket 32. In some other embodiments, another connection structure may be formed between the second fixed bracket 32 and the second housing 30. This is not strictly limited in the present application.

[0124] The flexible display has a multi-layer structure. The layers are joined, for example, by an OCA optical adhesive, and the OCA optical adhesive is elastic. When the electronic device is bent, the flexible display generates a tension in the direction opposite to the bending direction. Since the tension of each layer accumulates, the flexible display deforms during the bending process, and the layers of the flexible display are staggered. When the electronic device is restored to a flat state, the self-healing time of the screen is affected by the physical properties, so wrinkles appear in the bent portion 2002 of the flexible display 200, thereby reducing the flatness of the flexible display and affecting the user experience. When the flexible display 200 is repeatedly folded, the deformation generated on the screen becomes difficult to recover, and the problem of screen wrinkles becomes more serious.

[0125] In this embodiment of the present application, the contact force between the folding mechanical parts promotes the recovery of the wrinkles of the flexible display 200, thereby enhancing the flattening effect of the screen.

[0126] In some embodiments, as shown in FIGS. 12 to 14, the rotation mechanism 20 can further include a first damping member 91. The first damping member 91 is disposed on the first fixed bracket 31, and the first rotating arm 51 abuts against the first damping member 91. The first elastic body can include the first damping member 91 and the first fixed bracket 31. In this embodiment of the present application, the contact force between the first rotating arm 51 and the first damping member 91 is used to promote the recovery of wrinkles of the flexible display 200.

[0127] FIG. 15 is a schematic exploded view showing the partial structure shown in FIGS. 12 to 14. The structure shown in FIG. 15 includes a first damping member 91, a part of the first fixed bracket 31, and the first rotating arm 51.

[0128] As shown in FIGS. 12 to 14, the first rotating arm 51 is connected to the first connection block 311 of the first fixed bracket 31 by using a rotating shaft 5112. The first connection block 311 has a claw shape, and the first end 511 of the first rotating arm 51 also has a claw shape. The claw-shaped first connection block 311 is alternately connected to the claw-shaped first end 511. Specifically, a connection hole 5111 is provided at the first end 511 of the first rotating arm 51, and a connection hole 3111 is provided at the first connection block 311. Since the rotating shaft 5112 passes through the connection hole 5111 and the connection hole 3111, the first end 511 of the first rotating arm 51 is alternately connected to the first connection block 311, thereby realizing the connection between the first rotating arm 51 and the first connection block 311.

[0129] As shown in FIG. 15, in some embodiments, the first damping member 91 can include a first bracket 911 and a first elastic component 912. The first bracket 911 has a rigid structure and is difficult to deform by an external force. The first elastic component 912 has an elastic structure and is easy to deform by an external force.

[0130] As shown in FIGS. 14 and 15, in some embodiments, the first fixed bracket 31 further has a first mounting groove 319, and the first damping member 91 is disposed in the first mounting groove 319. The middle part of the groove wall of the first mounting groove 319 is recessed to form a guide space 3191 of the first mounting groove 319. The first bracket 911 of the first damping member 91 has a seventh flange 9112. The seventh flange 9112 of the first bracket 911 cooperates with the guide space 3191 of the first mounting groove 319 to realize a sliding connection between the first bracket 911 and the first mounting groove 319. Since the length of the guide space 3191 is longer than the length of the flange 9112, the first bracket 911 can slide within the first mounting groove 319.

[0131] As shown in FIG. 15, the first end 911a of the first bracket 911 of the first damping member 91 includes a third connection block 9113 (the first mechanical component), and the third connection block 9113 may be in a claw shape. The third connection block 9113 and the first connection block 311 are alternately arranged, and the claw-shaped third connection block 9113 abuts against the claw-shaped first end 511 of the first rotating arm 51. The second end 911b of the first bracket 911 elastically abuts against the first fixed bracket 31 using a first elastic component 912. Therefore, when the first damping member 91 abuts against the first rotating arm 51 and the first damping member 91 elastically abuts against the first fixed bracket 31, the contact force between the first rotating arm 51 and the first damping member 91 is transmitted to the first fixed bracket 31 using the first damping member 91. Referring to FIG. 7, since the first fixed bracket 31 is fixedly connected to the first housing 10, the first housing 10 is fixedly connected to the first non-bending portion 2001 of the flexible display 200. Therefore, by using the fixed connection among the first fixed bracket 31, the first housing 10, and the flexible display 200, the contact force between the first rotating arm 51 and the first damping member 91 can be transmitted to the first non-bending portion 2001 of the flexible display 200, thereby promoting the recovery of wrinkles of the flexible display 200 and enhancing the flattening effect of the screen.

[0132] In some embodiments, as shown in FIG. 15, the second end 911b of the first bracket 911 can include a plurality of guide posts 9111, and the plurality of guide posts 9111 are spaced apart from each other. The first elastic component 912 can include a plurality of springs 9121, and the plurality of springs 9121 are sleeved on the plurality of guide posts 9111 in a one-to-one correspondence. The first end 9121a of the spring 9121 abuts against the first bracket 911. For example, the first end 9121a of the spring 9121 abuts against the third connection block 9113 of the first bracket 911. The second end 9121b of the spring 9121 abuts against the first fixed bracket 31. For example, the second end 9121b of the spring 9121 abuts against the stop block 310. The stop block 310 is fixedly arranged on the first fixed bracket 31. The third connection block 9113, the spring 9121, and the stop block 310 are sequentially arranged along the first direction P1. The first direction P1 is parallel to the length extension direction of the first elastic component 912 and is far away from the main shaft 1. A gap is provided between the first bracket 911 and the stop block 310 to ensure a space for the first bracket 911 to slide in the first mounting groove 319. Since the first bracket 911 abuts against the first rotating arm 51, the abutting force of the first end 511 of the first rotating arm 51 against the first bracket 911 can push the first bracket 911 to slide along the first direction with respect to the guide space 3191 of the first mounting groove 319. When the first bracket 911 slides along the first direction with respect to the first mounting groove 319, the second end 9121b of the spring 9121 abuts against the stop block 310, so the spring 9121 is compressed to produce elastic deformation, and the spring 9121 generates an elastic force. Due to the abutting relationship between the spring 9121 and the stop block 310 of the first fixed bracket 31, when the spring 9121 is compressed, the elastic force is transmitted to the first fixed bracket 31. Also, by using the first fixed bracket 31 and the first housing 10 to transmit a force in the first direction to the first non-bending portion 2001 of the flexible display 200, the recovery of wrinkles of the flexible display 200, especially the rapid recovery of wrinkles of the bending portion 2002 of the flexible display 200, is promoted.

[0133] In this embodiment of the present application, the spring is an embodiment of the elastic structure and does not constitute a limitation on the elastic structure. The elastic structure may be a structure that is easily elastically deformed by an external force and can return to its original state after the external force is removed. For example, in one embodiment, the elastic structure may be elastic rubber. The fitting relationship between the elastic structure and the first bracket is not limited to being sleeved, and for example, they may be in contact. For the sake of easy explanation, a spring is used as an example for explanation in this embodiment of the present application.

[0134] In the bending process of the electronic device, the deformation of the flexible display changes according to the bending angle. For example, when the flexible display is in the closed state, the tension between the layers of the flexible display is the largest, the relative displacement between the layers is relatively serious, and the deformation of the flexible display is relatively large. When the flexible display is returned from the bent state to the flat state, since the deformation of the screen requires a recovery time, wrinkles are generated at the bent portion of the flexible display. Therefore, when the flexible display is in various states, applying various forces to the flexible display helps to ensure the structural reliability of the flexible display.

[0135] FIG. 16 is a schematic cross-sectional view of the position of the first rotating arm 51 corresponding to the flat state of the folding device 100 shown in FIG. 2 (i.e., the cutting line A1-A1 shown in FIGS. 12 and 15), and FIG. 17 is a schematic cross-sectional view of the position of the first rotating arm 51 corresponding to the closed state of the folding device 100 shown in FIG. 2 (i.e., the cutting line A1-A1 shown in FIGS. 12 and 15).

[0136] As shown in FIGS. 16 and 17, the first end portion 511 of the first rotating arm 51 is designed as a structure with a special shape. For example, as shown in FIG. 16, when the first housing 10 and the second housing 30 are relatively deployed to a flat state, the first portion of the third connection block 9113 of the first bracket 911 abuts against the first portion of the first end portion 511 of the first rotating arm 51. That is, the first portion of the first mechanical component abuts against the first portion of the second mechanical component. The contact force of the first rotating arm 51 against the first bracket 911 is F1. F 1x is the component force of F1 in the first direction P1, and F 1y is the component force of F1 in the second direction P2. The second direction P2 is orthogonal to the first direction P1, and the second direction P2 is orthogonal to the length direction of the main shaft 1. As described above, due to the component force of F1 in the first direction P1, the spring 9121 is compressed and deformed, the length of the compressed spring 9121 is X1, and the elastic deformation amount of the spring 9121 is ΔX1. According to Hooke's law, the spring force is proportional to the elastic shape deformation amount (variable: variable) of the spring. Therefore, when the first housing 10 and the second housing 30 are relatively deployed to a flat state, the elastic force of the spring in the first direction P1 is F k1 = k·ΔX1, where k is a constant.

[0137] For example, as shown in FIG. 17, when the first housing 10 and the second housing 30 are relatively folded into an intermediate state or a closed state, the contact force of the first rotating arm 51 against the first bracket 911 is F2. F 2x is the component force of F2 in the first direction P1, and F 2y is the component force of F2 in the second direction P2. As described above, the component force F 2x in the first direction can deform the spring 9121 after compression. The length of the compressed spring 9121 is X2, and the elastic shape deformation amount of the spring 9121 is ΔX2. Therefore, the elastic force of the spring in the first direction P1 is F k2 = k·ΔX2, where k is a constant.

[0138] When the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the second portion of the third connection block 9113 of the first bracket 911 abuts against the second portion of the first end 511 of the first rotating arm 51. That is, the second portion of the first mechanical component abuts against the second portion of the second mechanical component, the first portion of the first mechanical component is different from the second portion of the first mechanical component, and the first portion of the second mechanical component is different from the second portion of the second mechanical component. The component force F in the first direction of the contact force F1 of the first rotating arm 51 against the first bracket 911 1x is the component force F in the first direction of the contact force F2 of the first rotating arm 51 against the first bracket 911 when the first housing 10 and the second housing 30 are folded to an intermediate state or a closed state 2x is greater. Therefore, the compression amount ΔX1 of the spring is greater than ΔX2. Further, F k1 is greater than F k2 . That is, when the first housing 10 and the second housing 30 are relatively unfolded to an unfolded state, the force F transmitted to the first fixed bracket 31 by the spring 9121 k1 is the force F transmitted to the first fixed bracket 31 by the first elastic component 912 when the first housing 10 and the second housing 30 are folded to an intermediate state or a closed state k2 is greater. Therefore, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, F k1 transmits an elastic force to the first non-bending portion 2001 of the flexible display 200 using the first fixed bracket 31 and the first housing 10 to restore the wrinkles of the flexible display 200

[0139] In another possible embodiment, when the first housing 10 and the second housing 30 are folded relative to each other to an intermediate state or a closed state, the spring 9121 may be in a free state or an extended state

[0140] FIG. 18 is a schematic diagram comparing the spring lengths in the flat state (upper part of FIG. 18) and the folded state (lower part of FIG. 18) of the electronic device.

[0141] For example, as shown in FIG. 18, the first end 511 of the first rotating arm 51 abuts against the third connection block 9113 of the first bracket 911. The distance between the axis of the stop block 310 and the axis of the rotating shaft 5112, which is parallel to the length direction of the first elastic component 912, is L. Since the stop block 310 and the connection hole 3111 are fixedly arranged on the first fixed bracket, when the relative position between the rotating shaft 5112 and the connection hole 3111 of the first fixed bracket 31 in the first direction P1 does not change, the distance L does not change. The pressing surface between the first elastic component 912 and the third connection block 9113 is P.

[0142] Referring to FIGS. 16 and 18, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the spring 9121 is in a compressed state. For example, the length of the spring 9121 is X1, the distance in the first direction between the axis of the rotating shaft 5112 and the contact surface P is Y1, and L = X1 + Y1.

[0143] Referring to FIGS. 17 and 18, when the first housing 10 and the second housing 30 are folded relative to each other to an intermediate state or a closed state, the spring 9121 can be in a compressed state. For example, the length of the spring 9121 is X2, the distance in the first direction between the axis of the rotating shaft 5112 and the contact surface P is Y2, and L = X2 + Y2.

[0144] The first end 511 of the first rotating arm 51 relates to an abnormal structure. Since Y1 is larger than Y2, X1 is smaller than X2. Therefore, by using the special-shaped structural design of the first end 511 of the first rotating arm 51, when the first housing 10 and the second housing 30 are folded into different states, the lengths of the spring 9121 are different. Specifically, the elastic shape deformation amounts of the spring 9121 are different, and the elastic forces transmitted by the spring 9121 to the first fixing bracket 31 are different. Therefore, the forces transmitted by the spring 9121 to the flexible display 200 using the first fixing bracket 31 and the first housing 10 are different.

[0145] In a possible embodiment, the pressing surface Q (not shown) between the third connection block 9113 and the first end 511 of the first rotating arm 51 is orthogonal to the first direction P1. In this case, the distance between the axis of the rotating shaft 5112 and the pressing surface Q when the electronic device 1000 is in a flat state is larger than the distance between the axis of the rotating shaft 5112 and the pressing surface Q when the electronic device 1000 is in a closed state.

[0146] In a possible embodiment, the third connection block 9113 may have a special-shaped structure such that the length of the spring 9121 when the first housing 10 and the second housing 30 are relatively unfolded into a flat state is shorter than the length of the spring 9121 when the first housing 10 and the second housing 30 are relatively folded into an intermediate state or a closed state.

[0147] For example, according to the special-shaped structural design of the first end portion 511 of the first rotating arm 51 and / or the third connection block 9113, when folding the first housing 10 and the second housing 30 into different states, the first end portion 511 of the first rotating arm 51 abuts against the third connection block 9113 of the first bracket 911 at different positions, and the first rotating arm 51 has different abutting forces against the first bracket 911. Therefore, the lengths of the springs 9121 are different, and the forces transmitted to the flexible display 200 are different. In other words, the first portion of the first end portion 511 of the first rotating arm 51 is different from the second portion of the first end portion 511 of the first rotating arm 51, and / or the first portion of the third connection block 9113 is different from the second portion of the third connection block 9113. That is, the first portion of the first mechanical component is different from the second portion of the first mechanical component, and / or the first portion of the second mechanical component is different from the second portion of the second mechanical component.

[0148] FIG. 19 is a schematic diagram showing a closed state of an existing flexible display. For example, the flexible display 200 relates to a three-layer composite structure. As shown in FIG. 19, the arrow direction is the tension direction in the bending process of the flexible display. When the narrow angle α between the first housing 10 and the second housing 30 decreases to 0°, the flexible display 200 is in a closed state, the bent portion 2002 of the flexible display 200 generates an outward tension, and the flexible display 200 is deformed. There is a layered misalignment in the three-layer structure shown in FIG. 19.

[0149] Fig. 20 is a schematic diagram showing a flat state of an existing flexible display. As shown in Fig. 20, when the flexible display 200 expands from a closed state to a flat state, the tension of the flexible display 200 is reduced, and the layer misalignment of the three-layer structure at A shown in Fig. 20 is reduced. The deformation caused by the flexible display 200 requires a recovery time. Thus, when the flexible display 200 is unfolded, wrinkles are generated in the area of the bend 2002.

[0150] 21 is a schematic diagram showing the flat state of the flexible display shown in this solution. As shown in FIG. 21, when the electronic device 1000 expands from the closed state to the flat state, a component force F parallel to the length direction of the spring 9121, i.e., the first direction P1, is generated as shown in FIG. 16 to FIG. 1x causes the spring 9121 to deform, and the elastic force F generated by the spring 9121 k1 is further transmitted to the first non-flexing portion 2001 of the flexible display 200. When the electronic device 1000 is in a flat state, the force F transmitted by the spring 9121 to the first fixing bracket 31 is k1 is a force F transmitted to the first fixing bracket 31 by the first elastic part 912 when the electronic device 1000 is in the closed state. k2 Therefore, the length X1 of the spring 9121 when the electronic device 1000 is in a flat state is shorter than the length X2 of the spring 9121 when the electronic device 1000 is in a closed state. Thus, the first damping member 91 is positioned such that the force applied to the first non-flexing portion 2001 of the flexible display 200 in the flat state along the first direction P1 is greater than the force applied to the first non-flexing portion 2001 in the closed state along the first direction P1.

[0151] In some embodiments, as shown in FIGS. 12 to 14, the rotating mechanism 20 may further include a second damping member 92. The second damping member 92 may be disposed on the side of the rotating mechanism 20 close to the second housing 30. The second damping member 92 may include a second elastic component 922. The second elastic component can include the second damping member 92 and the second fixing bracket 32. Similarly, since the second fixing bracket 32 is fixedly connected to the second housing 30, the second housing 30 is fixedly connected to the second non-bending portion 2003 of the flexible display 200. Therefore, by providing the second damping member 92, the second non-bending portion 2003 of the flexible display 200 receives the force in the third direction P3 in a flat state rather than the force in the third direction P3 in a closed state. The third direction P3 is parallel to the length extension direction of the second elastic component 922 and is a direction away from the main shaft 1.

[0152] In conclusion, when the electronic device 1000 is unfolded from the closed state to the flat state, the force in the first direction received by the first non-bending portion 2001 of the flexible display 200 is greater than the force in the first direction received by the first non-bending portion 2001 of the flexible display 200 in the closed state. The second non-bending portion 2003 receives a force in the third direction greater than the force in the third direction in the closed state. Therefore, by arranging the first damping member 91 and the second damping member 92, when the electronic device is unfolded from the closed state to the flat state, the phenomenon of layered displacement of the flexible display 200 can be reduced, the recovery of wrinkles of the flexible display 200 can be promoted, thereby enhancing the flattening effect of the screen.

[0153] For example, the structure of the second damping member 92 may be the same as that of the first damping member 91, thereby simplifying the types of materials of the rotating mechanism 20 and reducing the design difficulty and cost. The specific structure of the second damping member 92 will not be described again in this embodiment of the present application. In some other embodiments, the structure of the second damping member 92 may be different from that of the first damping member 91. The first damping member 91 and the second damping member 92 are arranged so as to promote the recovery of wrinkles of the flexible display from folding to unfolding, improve the flatness of the flexible display, and improve the user experience.

[0154] Please refer to FIGS. 12, 15, and 22 together. FIG. 22 is a schematic cross-sectional view of the position of the first connection block 311 corresponding to the structure shown in FIG. 12 (i.e., the A2-A2 cross-section shown in FIGS. 12 and 15).

[0155] As shown in FIG. 22, the cross-sectional area of the connection hole 3111 of the first fixing bracket 31 is larger than the area of the cross-sectional area region of the rotating shaft 5112. Therefore, the rotating shaft 5112 can move within the connection hole 3111. In order to ensure the reliability of the folding structure during the unfolding or folding process, in some embodiments, the lengths of the connection hole 3111 and the rotating shaft 5112 in the direction orthogonal to the first damping member 91, that is, the second direction P2, may be equal. As shown in FIG. 22, in some embodiments, the cross-sectional shape of the connection hole 3111 is a waist-round shape. In some other embodiments, the cross-sectional shape of the connection hole 3111 may be a rectangle, an ellipse, or the like.

[0156] FIG. 23a is a schematic view showing the fitting relationship between the rotating shaft 5112 and the connection hole 3111 at the initial stage of the use of the flexible display (the upper part of FIG. 23a) and after the use period (the lower part of FIG. 23a).

[0157] As shown in FIG. 23a, an example in which the cross-sectional shape of the connection hole 3111 is an oval is used. In the initial stage of the use of the flexible display 200, for example, within one year after use, the rotating shaft 5112 is in contact with the connection hole 3111 on the first side wall close to the first housing 10, that is, the left side of the oval shown in FIG. 23a, and the distance between the axis of the rotating shaft 5112 and the stop block 310 in the direction parallel to the length direction of the first elastic component 912, that is, the first direction P1, is L. When the first housing 10 and the second housing 30 are relatively unfolded into a flat state, the spring 9121 is in a compressed state. Referring to FIG. 16, for example, the length of the spring 9121 is X1, the compression amount of the spring 9121 is ΔX1, the distance in the first direction P1 between the axis of the rotating shaft 5112 and the contact surface P is Y1, and L = X1 + Y1.

[0158] As the usage time becomes longer, for example, when the usage time of the folding device 100 exceeds two years, after the flexible display 200 is folded multiple times and undergoes aging changes, due to the deformation caused by the lamination of the screen, it becomes difficult to restore to the original state, and the flexible display 200 becomes slightly longer. Since the first housing 10 is fixedly connected to the first non-bending portion 2001 of the flexible display 200, the first fixing bracket 31 is fixedly connected to the first housing 10. As the flexible display 200 becomes longer, the first non-bending portion 2001 of the flexible display 200 slightly moves the first housing 10 and the first fixing bracket 31 away from the main shaft 1, that is, until the rotating shaft 5112 contacts the second side wall of the connection hole 3111 away from the first housing 10, that is, the right side of the oval shown in FIG. 23a, the connection hole 3111 moves in a direction away from the main shaft 1 with respect to the rotating shaft 5112. The first side wall of the connection hole 3111 faces the second side wall.

[0159] As shown in FIG. 23a, after the flexible display 200 has been used for a certain period of time and undergoes aging changes, the distance between the axis of the rotation shaft 5112 and the stop block 310, which is parallel to the length direction of the first elastic component 912, is L'. When the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the spring 9121 is in a compressed state. For example, the length of the spring 9121 is X3, the compression amount of the spring 9121 is ΔX3, the distance in the first direction P1 between the axis of the rotation shaft 5112 and the contact surface P is Y3, and L' = X3 + Y3. As described above, L' is greater than L.

[0160] According to the shape design of the connection hole 3111 of the first fixed bracket 31, since the folding device 100 may slightly extend as the flexible display 200 undergoes aging changes, the flexible display 200 is more attached by the folding device 100, and the wrinkles of the flexible display 200 are reduced (weakened).

[0161] As shown in FIG. 23a, in one embodiment, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the first end 511 of the first rotating arm 51 always abuts against the first connection block 311, and the pressing position does not change. Therefore, the distance in the first direction P1 between the axis of the rotation shaft 5112 and the contact surface P does not change, that is, Y1 = Y3. Therefore, X1 is smaller than X3, that is, the compression amount ΔX3 of the spring is smaller than ΔX1. Therefore, after the flexible display 200 has been used for a certain period of time and undergoes aging changes, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the compression amount of the spring 9121 decreases, and the force transmitted to the flexible display 200 by the spring 9121 using the first fixed bracket 31 and the first housing 10 decreases.

[0162] FIG. 23b is a schematic diagram comparing the spring lengths of the electronic device in the flat state (upper part of FIG. 23b) and the folded state (lower part of FIG. 23b) after the aging of the flexible display.

[0163] For example, as shown in FIG. 23b, the distance between the axis of the stop block 310 and the axis of the rotation shaft 5112 parallel to the length direction of the first elastic component 912 is L'. Since the stop block 310 and the connection hole 3111 are fixedly arranged on the first fixed bracket, when the relative position in the first direction P1 between the rotation shaft 5112 and the connection hole 3111 of the first fixed bracket 31 does not change, the distance L' remains unchanged.

[0164] As shown in FIG. 23b, when the first housing 10 and the second housing 30 are relatively deployed to a flat state, the spring 9121 is in a compressed state. For example, the length of the spring 9121 is X3, the distance in the first direction between the axis of the rotation shaft 5112 and the contact surface P is Y3, and L' = X3 + Y3. When the first housing 10 and the second housing 30 are folded relative to each other to an intermediate state or a closed state, the spring 9121 can be in a compressed state. For example, the length of the spring 9121 is X4, the distance in the first direction between the axis of the rotation shaft 5112 and the contact surface P is Y4, and L' = X4 + Y4.

[0165] The first end 511 of the first rotating arm 51 relates to an irregular structure. Since Y3 is greater than Y4, X3 is smaller than X4. Similarly, according to the structural design of the irregular shape of the first end 511 of the first rotating arm 51, after the flexible display 200 has aged, the force applied to the first non-bending portion 2001 of the flexible display 200 in the expanded state and along the first direction P1 is greater than the force applied to the first non-bending portion 2001 of the flexible display 200 in the closed state and along the first direction P1.

[0166] Referring to FIGS. 23a and 23b, after the flexible display 200 has aged and become longer, the wrinkles of the flexible display 200 in the flat state are jointly weakened by using the elliptical hole and the structural design of the irregular shape at the first end 511 of the first rotating arm 51.

[0167] As shown in FIG. 14, for example, the shape of the connection hole 3211 of the second fixed bracket 32 can be the same as or similar to the shape of the connection hole 3111 of the first fixed bracket. Since the second housing 30 is fixedly connected to the second non-bending portion 2003 of the flexible display 200, the second fixed bracket 32 is fixedly connected to the second housing 30. Based on the same or similar reasons as described above, when the usage time of the screen is long, the rotation shaft 5212 moves within the connection hole 3211, and the second non-bending portion 2003 of the flexible display 200 slightly moves the second housing 30 and the second fixed bracket 32 away from the main shaft 1. As a conclusion, since the flexible display 200 is fixed to the folding device 100, by using the shape design of the connection hole 3111 of the first fixed bracket 31 and the connection hole 3211 of the second fixed bracket 32, the folding device 100 may slightly extend as the flexible display 200 ages, whereby the flexible display 200 is more attached by the folding device 100, the wrinkles of the flexible display 200 are reduced, and when the electronic device 1000 is in a flat state, the flexible display 200 becomes flatter, thereby improving the user experience.

[0168] In some embodiments, the flexible display 200 may include a holding plate 201. The holding plate 201 is related to the flexible display 200 and is disposed on the surface fixedly connected to the folding device 100, that is, on the non-display side of the flexible display 200, and enhances the overall strength of the flexible display 200. Specifically, the holding plate 201 may be a plate-like structure having a specific rigidity, such as a metal plate, a glass plate, or a plastic plate. As shown in FIG. 24, the holding plate 201 includes a first fixing portion 2011, a connecting portion 2012, and a second fixing portion 2013 that are connected in sequence. For example, a through hole 2014 penetrating the upper and lower plate surfaces of the holding plate 201 may be provided in the connecting portion 2012, thereby reducing the rigidity of that region. When the flexible display 200 ages and becomes longer, the connecting portion 2012 provided with the through hole 128 may be deformed, and the holding plate 201 may be deformed.

[0169] Please refer to both FIGS. 25 and 26. FIG. 25 is a schematic diagram showing the structure of the intermediate connecting component 20b shown in FIG. 11, and FIG. 26 is a schematic exploded view of the intermediate connecting component 20b shown in FIG. 25.

[0170] In some embodiments, the rotation mechanism 20 further includes a third fixing bracket 33, a fourth fixing bracket 34, a third transmission arm 40, and a fourth transmission arm 50. The third fixing bracket 33 may be fixed to the first housing 10, one end of the third transmission arm 40 is rotatably connected to the main shaft 1, and the other end is slidably connected to the third fixing bracket 33. The fourth fixing bracket 34 may be fixed to the second housing 30, one end of the fourth transmission arm 50 is rotatably connected to the main shaft 1, and the other end is slidably connected to the fourth fixing bracket 34.

[0171] As shown in FIG. 26, in some embodiments, the third fixed bracket 33 can have a plurality of fastening holes 332, and the fourth fixed bracket 34 can have a plurality of fastening holes 342. Referring to FIG. 8, the plurality of fastening holes 332 of the third fixed bracket 33 can be aligned with the plurality of fastening holes 1021 of the first positioning plate 102, and the third fixed bracket 33 and the first positioning plate 102 are locked using a fastener to fix the third fixed bracket 33 and the first housing 10. Referring to FIG. 9, the plurality of fastening holes 342 of the fourth fixed bracket 34 can be aligned with the plurality of fastening holes 3021 of the second positioning plate 302, and the third fixed bracket 33 and the second positioning plate 302 are locked using a fastener to fix the fourth fixed bracket 34 and the second housing 30. The fastener can include, but is not limited to, screws, bolts, rivets, etc. In some other embodiments, another connection structure can also be formed between the third fixed bracket 33 and the first housing 10, and between the fourth fixed bracket 34 and the second housing 30. This is not strictly limited in this application.

[0172] In this embodiment, the third fixed bracket 33, the fourth fixed bracket 34, the third transmission arm 40, and the fourth transmission arm 50 are arranged within the rotation mechanism 20 to enhance the interaction force between the rotation mechanism 20 and the first housing 10, and between the rotation mechanism 20 and the second housing 30, thereby making it easier to fold and deploy the folding device 100.

[0173] As shown in FIG. 26, in some embodiments, the third fixed bracket 33 has a fifth sliding groove 331, and the side wall of the fifth sliding groove 331 may have a recessed guide space 3311. The third transmission arm 40 includes a sliding end 401, a rotating end 402, and a support block 403. The sliding end 401 of the third transmission arm 40 has a fifth flange 4011. Through the cooperation between the fifth flange 4011 and the guide space 3311 of the fifth sliding groove 331, a sliding connection is made between the sliding end 401 of the third transmission arm 40 and the fifth sliding groove 331, and a sliding connection between the third transmission arm 40 and the third fixed bracket 33 can be realized. The rotating end 402 of the third transmission arm 40 is arc-shaped, and a rotating connection between the rotating end 402 of the third transmission arm 40 and the main shaft 1 may be realized using a virtual shaft. In some other embodiments, a rotatable connection may be realized between the third transmission arm 40 and the main shaft 1 using a solid shaft. This is not strictly limited in the present application. Specifically, connecting a mechanical component to the main shaft 1 using a virtual shaft means that the mechanical component cooperates with the movable space formed inside the main shaft 1, and connecting a mechanical component to the main shaft 1 using a solid shaft means connecting the mechanical component to the main shaft 1 using a rotating shaft such as a pin.

[0174] As shown in FIG. 26, in some embodiments, the fourth fixed bracket 34 has a sixth sliding groove 341, and the side wall of the sixth sliding groove 341 may have a recessed guide space 3411. The fourth transmission arm 50 includes a sliding end 501, a rotating end 502, and a support block 503. The sliding end 501 of the fourth transmission arm 50 has a sixth flange 5011. Through the cooperation between the sixth flange 5011 and the guide space 3411 of the sixth sliding groove 341, a sliding connection is made between the sliding end 501 of the fourth transmission arm 50 and the sixth sliding groove 341, and a sliding connection between the fourth transmission arm 50 and the fourth fixed bracket 34 can be realized. The rotating end 502 of the fourth transmission arm 50 is arc-shaped. A rotatable connection between the rotating end 502 of the fourth transmission arm 50 and the main shaft 1 may be realized using a virtual shaft. In some other embodiments, a rotatable connection between the fourth transmission arm 50 and the main shaft 1 may be realized using a solid shaft. This is not strictly limited in the present application.

[0175] Please refer to FIGS. 27 and 28 together. FIG. 27 is a schematic diagram showing a partial structure of the rotating mechanism 20 shown in FIG. 7, and FIG. 28 is a schematic exploded view of the structure shown in FIG. 27.

[0176] As shown in FIG. 28, the first support plate 21 includes a first plate member 211 and a second plate member 212, and the first plate member 211 and the second plate member 212 are respectively located on both sides of the second transmission arm 42. The first plate member 211, the sliding end 421 of the second transmission arm 42, and the second plate member 212 are sequentially fixed using fasteners. The second support plate 22 includes a third plate member 221 and a fourth plate member 222, and the third plate member 221 and the fourth plate member 222 are respectively located on both sides of the first transmission arm 41. The third plate member 221, the sliding end 411 of the first transmission arm 41, and the fourth plate member 222 are sequentially fixed using fasteners. By dividing the first support plate 21 and the second support plate 22 into two plate materials, production and manufacturing can be facilitated. In some other embodiments, the first support plate 21 and / or the second support plate 22 may alternatively be integrally formed mechanical parts.

[0177] In some embodiments, as shown in FIGS. 27 and 28, the first support plate 21 is fixedly connected to the sliding end 421 of the second transmission arm 42, and the second support plate 22 is fixedly connected to the sliding end 411 of the first transmission arm 41. The first sliding plate 23 is related to the second plate member 212 of the first support plate 21 and is located on the side opposite to the second transmission arm 42, and is fixedly connected to the second plate member 212 of the first shielding plate 21. The second shielding plate 24 is related to the second plate member 222 of the second support plate 22 and is located on the side opposite to the first transmission arm 41, and is fixedly connected to the second plate member 222 of the second shielding plate 22. The first shielding plate 23 and the second plate member 212, and the second shielding plate 24 and the fourth plate member 222 may be fixed to each other by a method such as adhesion.

[0178] In this embodiment, the first support plate 21, the first shielding plate 23, and the second transmission arm 42 are assembled into one component, and the second support plate 22, the second shielding plate 24, and the first transmission arm 41 are assembled into one component. Therefore, the second transmission arm 42 can directly control the movement trajectories of the first support plate 21 and the first shielding plate 23, and the first transmission arm 41 can directly control the movement trajectories of the second support plate 22 and the second shielding plate 24. In this way, when controlling the movement processes of the first support plate 21, the second support plate 22, the first shielding plate 23, and the second shielding plate 24, the accuracy is high, the hysteresis is small, accurate expansion and contraction are realized when the folding device 100 rotates, and the requirements for supporting the flexible display 200 and the self-shielding requirements of the rotation mechanism 20 are satisfied.

[0179] For example, the first support plate 21 is fixed to the second transmission arm 42 of the first end connection component 20a, and the first support plate 21 is further fixed to the second transmission arm 42' of the second end connection component 20a'. The first shielding plate 23 is fixed to the second transmission arm 42 of the first end connection component 20a, and the first shielding plate 23 is further fixed to the second transmission arm 42' of the second end connection component 20a'. The first support plate 21 may be further fixed to the third transmission arm 40 of the intermediate connection component 20b, and the first shielding plate 23 may be further fixed to the third transmission arm 40 of the intermediate connection component 20b. The second support plate 22 is fixedly connected to the first transmission arm 41 of the first end connection component 20a, and the second support plate 22 is further fixedly connected to the first transmission arm 41' of the second end connection component 20a'. The second support plate 22 may be further fixedly connected to the fourth transmission arm 50 of the intermediate connection component 20b. The second shielding plate 24 is fixedly connected to the first transmission arm 41 of the first end connection component 20a, and the second shielding plate 24 is further fixedly connected to the first transmission arm 41' of the second end connection component 20a'. The second shielding plate 24 may be further fixedly connected to the fourth transmission arm 50 of the intermediate connection component 20b. In this case, the plurality of connection components (20a, 20a', and 20b) can move the first support plate 21, the first shielding plate 23, the second support plate 22, and the second shielding plate 24 together to reduce the difficulty of motion control and improve the accuracy of motion control.

[0180] In some embodiments, the transmission arm can be fixedly connected to the support plate or the shielding plate using a fastener. For example, the sliding end of the transmission arm is fixedly connected to the support plate using a fastener, or the sliding end of the transmission arm is fixedly connected to the shielding plate using a fastener. The fasteners include, but are not limited to, screws, bolts, rivets, alignment pins, etc. By further arranging a concave-convex fitting structure between the sliding ends of the plurality of transmission arms and the support plate, and between the sliding ends of the plurality of transmission arms and the shielding plate, the assembly accuracy and reliability are improved.

[0181] In this embodiment, the structure of the second support plate 22 may be the same as or similar to the structure of the first support plate 21, and the structure of the second shielding plate 24 may be the same as or similar to the structure of the first support plate 21. Thereby, the types of materials of the rotating mechanism 20 are simplified, and the difficulty and cost of the design of the rotating mechanism 20 are reduced.

[0182] Please refer to FIGS. 29 and 30 together. FIG. 29 is a schematic view showing the structure of the inner main shaft 15 shown in FIG. 11, and FIG. 30 is a schematic view showing the structure of the outer main shaft 14 shown in FIG. 11 from another angle.

[0183] In some embodiments, as shown in FIG. 29, the inner main shaft 15 includes an inner main shaft body 151, a plurality of grooves 152, a plurality of protrusions 153, two end stoppers 154, and a plurality of fastening holes 155. The inner main shaft 15 may be divided into a plurality of segments to reduce weight. The plurality of protrusions 153 are formed on the inner main shaft body 151, the plurality of grooves 152 are formed on the inner main shaft body 151 and / or the plurality of protrusions 153, and the protrusions 153 and the grooves 152 are combined with each other to form a plurality of three-dimensional space structures. The two end stoppers 154 are fixed to both ends of the inner main shaft body 151. The plurality of fastening holes 155 are formed in the inner main shaft body 151. Some of the grooves 152, some of the protrusions 153, and some of the fastening holes 155 are schematically marked in FIG. 29.

[0184] As shown in FIG. 30, the outer main shaft 14 includes an outer main shaft body 141, a plurality of grooves 142, a plurality of protrusions 143, and a plurality of fastening holes 145. The outer main shaft body 141 is in the shape of a substantially arc-shaped plate. The plurality of protrusions 143 are formed on the outer main shaft body 141, the plurality of grooves 142 are formed on the outer main shaft body 141 and / or the plurality of protrusions 143, and the protrusions 143 and the grooves 142 are combined with each other to form a plurality of three-dimensional spatial structures. The plurality of fastening holes 145 are formed in the plurality of protrusions 143. Some of the grooves 142, some of the protrusions 143, and some of the fastening holes 145 are schematically marked in FIG. 30.

[0185] After the outer main shaft 14 and the inner main shaft 15 are fixed to each other, the outer main shaft body 141, the inner main shaft body 151, and the two end stoppers 154 are surrounded together to form the internal space of the main shaft 1. The two end stoppers 154 are exposed. The plurality of fastening holes 145 of the outer main shaft 14 are aligned with the plurality of fastening holes 155 of the inner main shaft 15, and the inner main shaft 15 and the outer main shaft 14 are fixed using a fastener (not shown). The fasteners include, but are not limited to, screws, bolts, rivets, pins, and the like.

[0186] After the outer main shaft 14 and the inner main shaft 15 are assembled, the plurality of grooves and protrusions on the outer main shaft 14 and the plurality of grooves and protrusions on the inner main shaft 15 can jointly form a plurality of movable spaces of the main shaft 1. By movably attaching the mechanical parts of the plurality of connecting parts (20a, 20a', 20b) to the plurality of movable spaces of the main shaft 1, the connection with the main shaft 1 is realized. The inner main shaft 15 and the outer main shaft 14 are designed separately. This helps to reduce the difficulty of manufacturing the main shaft 1 and improve the accuracy and product yield of manufacturing the main shaft 1.

[0187] For example, among the plurality of movable spaces of the main shaft 1, some of the movable space structures are the same, and some of the movable space structures are different. By using the movable spaces with different structures to cooperate with mechanical parts with different structures, the connection structure between the main shaft 1 and the plurality of connecting parts (20a, 20a', 20b) becomes more flexible and diversified. The movable spaces with the same structure are used to cooperate with mechanical parts with the same structure. This helps to reduce the difficulty and cost of designing the main shaft 1 and the connecting parts.

[0188] It will be understood that the main shaft 1 in this embodiment of the present application may alternatively have another structure. This is not strictly limited in the present application.

[0189] FIG. 31 is a schematic diagram showing the fitting relationship between the partial structure shown in FIG. 14 and the main shaft 1, and FIG. 32 is a schematic diagram showing the fitting relationship between the partial structure shown in FIG. 31 and the main shaft 1. As shown in FIG. 31, the outer main shaft 14 and the inner main shaft 15 are surrounded together to form a plurality of movable spaces of the main shaft 1 that fit different mechanical parts of the connecting parts.

[0190] In some embodiments, as shown in FIG. 31, the rotating end 412 of the first transmission arm 41 is arc-shaped. The rotating end 412 of the first transmission arm 41 is rotatably connected to the main shaft 1. The rotation axis about which the first transmission arm 41 rotates with respect to the main shaft 1 is the first rotation axis 41C.

[0191] In some embodiments, as shown in FIG. 32, the rotating end portion 412 of the first transmission arm 41 cooperates with the arc-shaped groove 142a of the outer main shaft 14 and the arc-shaped protrusion 153a of the inner main shaft 15 to achieve a rotational connection to the main shaft 1. The rotating end portion 412 of the first transmission arm 41 can further include a limiting protrusion 4121, and the limiting protrusion 4121 is formed at an inner position and / or an outer position of the rotating end portion 412. The arc-shaped protrusion 153a of the outer main shaft 14 can further include a limiting groove 1421a, and the arc-shaped protrusion 153a of the inner main shaft 15 can further include a limiting groove 1531a. The limiting protrusion 4121 of the first transmission arm 41 cooperates with the limiting groove 1421a and / or the limiting groove 1531a of the main shaft 1. In this way, the first transmission arm 41 and the main shaft 1 are mutually restricted in the axial direction of the main shaft 1, improving the reliability of the connection structure. It will be understood that one limiting groove (1531a or 1421a) is arranged in the same movable space, whereby the mechanical parts are restricted in the axial direction of the main shaft 1. Certainly, in some embodiments, two limiting grooves (1531a and 1421a) can be arranged in the same movable space to improve the limiting stability. The inner main shaft 15 can further include a limiting groove 1531b and a limiting groove 1531b', and both ends of the rotating shaft 6121 cooperate with the limiting groove 1531b and the limiting groove 1531b' respectively.

[0192] In some embodiments, as shown in FIG. 31, the rotating end portion 422 of the second transmission arm 42 is arc-shaped. The rotating end portion 422 of the second transmission arm 42 is rotatably connected to the main shaft 1. The rotation axis about which the second transmission arm 41 rotates relative to the main shaft 1 may be the second rotation axis 42C. The movable spaces in which the main shaft 1 accommodates the first transmission arm 41 and the second transmission arm 42 are arranged in pairs and have a centrosymmetric structure. For the fitting relationship between the second transmission arm 42 and the main shaft 1, refer to the fitting relationship between the first transmission arm 41 and the main shaft 1. Details are not described in this application.

[0193] In this embodiment, the first transmission arm 41 and the second transmission arm 42 are connected to the main shaft 1 using a virtual shaft. The rotational connection structure is simple and space-saving. As a result, the thickness of the rotation mechanism 20 can be reduced, and the folding device 100 and the electronic device 1000 can be made lighter and thinner. In some other embodiments, the first transmission arm 41 and / or the second transmission arm 42 may be connected to the main shaft 1 using a solid shaft. This is not strictly limited in this embodiment of the present application.

[0194] Hereinafter, the structure of the first end connection component 20a will be described with reference to a plurality of schematic structural diagrams and internal structural diagrams of the folding device 100 in the unfolded state, the intermediate state, and the closed state, respectively.

[0195] Please refer to both FIGS. 33 and 34. FIG. 33 is a schematic diagram showing a partial structure when the folding device 100 shown in FIG. 2 is in a flat state, and FIG. 34 is a schematic cross-sectional view of the position of the first transmission arm 41 corresponding to the flat state of the folding device 100 shown in FIG. 2 (i.e., the cutting line A1-A1 shown in FIG. 12). FIG. 35 is a schematic cross-sectional view of another position of the first transmission arm 41 corresponding to the flat state of the structure shown in FIG. 32 (i.e., the cutting line A3-A3 shown in FIGS. 12 and 32).

[0196] As shown in FIGS. 33 and 34, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the rotating end portion 412 of the first transmission arm 41 is rotatably connected to the main shaft 1, and the area of the overlapping (lap joint) surface between the rotating end portion 412 of the first transmission arm 41 and the main shaft 1 is the first lap area. Referring to FIG. 14, the first flange 4111 of the sliding end portion 411 of the first transmission arm 41 is slidably connected to the guide space 3221 of the first sliding groove 322 of the second fixed bracket 32. Referring to FIG. 14, the first sliding groove 322 has an end portion A close to the main shaft 1 and an end portion B away from the main shaft 1, that is, the distance in the first direction P1 between the end portion A of the first sliding groove 322 and the main shaft 1 is shorter than the distance in the first direction P1 between the end portion B of the first sliding groove 322 and the main shaft 1. As shown in FIG. 34, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the distance in the third direction P3 between the first transmission arm 41 and the end portion B of the first sliding groove 322 is the first distance D1. The first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61. As shown in FIGS. 32 and 35, the limiting groove 1531b of the outer main shaft 14 and the inner main shaft 15 together surround to form an arc-shaped groove 156, and one end of the rotating shaft 6121 cooperates with the arc-shaped groove 156, and the rotating shaft 6121 is related to the arc-shaped groove 156 and is located at the end portion close to the first housing 10. Similarly, the other end of the rotating shaft 6121 cooperates with an arc-shaped groove 156' (arranged in a pair with the arc-shaped groove 156 and having the same structure, not shown) surrounded by the limiting groove 1531b' of the outer main shaft 14 and the inner main shaft 15 together to jointly realize the rotational connection between the first rotating arm 51 and the main shaft 1.

[0197] Please refer to both FIGS. 36 and 37. FIG. 36 is a schematic view showing a partial structure when the folding device 100 shown in FIG. 2 is in an intermediate state, and FIG. 37 is a schematic cross-sectional view of the position of the first rotating arm 41 corresponding to the intermediate state of the folding device 100 shown in FIG. 2 (i.e., the cross-section line A1-A1 shown in FIG. 12). FIG. 38 is a schematic cross-sectional view of another position of the first transmission arm 41 corresponding to the intermediate state of the structure shown in FIG. 31 (i.e., the cutting line A3-A3 shown in FIGS. 12 and 32).

[0198] As shown in FIGS. 36 and 37, in the process of relatively folding the first housing 10 and the second housing 30 from a flat state to an intermediate state, the rotating end portion 412 of the first transmission arm 41 rotates with respect to the main shaft 1, and the first flange 4111 of the first transmission arm 41 slides within the guide space 3221 of the second fixed bracket 32. That is, the first transmission arm 41 slides within the first sliding groove 322, the first transmission arm 41 gradually approaches the second fixed bracket 32 and the second housing 30, and the second fixed bracket 32 and the second housing 30 gradually approach the main shaft 1. The first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61, and the second end portion 512 of the first rotating arm 51 is connected to the first connection piece 61 using the rotating shaft 6121. As shown in FIG. 38, the rotating shaft 6121 slides within the arc groove 156 and the arc groove 156', and the first fixed bracket 31 and the first housing 10 gradually approach the main shaft 1. When the first housing 10 and the second housing 30 are in the intermediate state, the area of the overlapping surface between the rotating end portion 412 of the first transmission arm 41 and the main shaft 1 is the second overlapping area, and the second overlapping area is smaller than the first overlapping area. The distance in the third direction P3 between the first transmission arm 41 and the end B of the first sliding groove 322 is the second distance D2, and the second distance D2 is shorter than the first distance D1.

[0199] Please refer to FIGS. 39 and 40 together. FIG. 39 is a schematic diagram showing a partial structure when the folding device 100 shown in FIG. 2 is in a closed state, and FIG. 40 is a schematic cross-sectional view of the position of the first rotating arm 41 corresponding to the closed state of the folding device 100 shown in FIG. 2 (i.e., the cutting line A1-A1 shown in FIG. 12).

[0200] As shown in FIGS. 39 and 40, in the process of relatively folding the first housing 10 and the second housing 30 from an intermediate state to a closed state, the rotating end 412 of the first transmission arm 41 continues to rotate with respect to the main shaft 1, and the first flange 4111 of the first transmission arm 41 slides within the guide space 3221 of the second fixed bracket 32. That is, the first transmission arm 41 slides within the first sliding groove 322, the first transmission arm 41 continues to approach the second fixed bracket 32 and the second housing 30, and the second fixed bracket 32 and the second housing 30 continue to approach the main shaft 1. The first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61, and the first fixed bracket 31 and the first housing 10 continue to approach the main shaft 1. When the first housing 10 and the second housing 30 are in a closed state, the area of the overlapping surface between the rotating end 412 of the first transmission arm 41 and the main shaft 1 is the third lapping area, and the third lapping area is smaller than the second lapping area. The distance in the third direction P3 between the first transmission arm 41 and the end B of the first sliding groove 322 is the third distance D3, and the third distance D3 is smaller than the second distance D2. For example, the third distance D3 may be close to zero.

[0201] Please refer to FIGS. 41 to 43 together. FIG. 41 is a schematic cross-sectional view of the position of the second transmission arm 42 corresponding to the flat state of the folding device 100 shown in FIG. 2 (i.e., the B-B cross-section shown in FIG. 12). FIG. 42 is a schematic cross-sectional view of the position of the second rotating arm 42 corresponding to the intermediate state of the folding device 100 shown in FIG. 2 (i.e., the B-B cross-section shown in FIG. 12). FIG. 43 is a schematic cross-sectional view of the position of the second rotating arm 42 corresponding to the closed state of the folding device 100 shown in FIG. 2 (i.e., the B-B cutting line shown in FIG. 12). FIGS. 41 to 43 show the position change of the second transmission arm 42 in the process of the folding device 100 switching from the flat state to the closed state.

[0202] As shown in FIG. 41, when the first housing 10 and the second housing 30 are relatively unfolded into a flat state, the region of the joint surface between the rotating end 422 of the second transmission arm 42 and the main shaft 1 is the fourth joint region. Referring to FIG. 14, the second flange 4211 of the sliding end 421 of the second transmission arm 42 is slidably connected to the guide space 3121 of the second sliding groove 312 of the first fixed bracket 31. Referring to FIG. 14, the second sliding groove 312 has an end A' close to the main shaft 1 and an end B' away from the main shaft 1. That is, the distance in the first direction P1 between the end A' of the second sliding groove 312 and the main shaft 1 is shorter than the distance in the first direction P1 between the end B' of the second sliding groove 312 and the main shaft 1. As shown in FIG. 41, the distance in the first direction P1 between the second transmission arm 42 and the end B' of the second sliding groove 312 is the fourth distance D4. The second rotating arm 52 is connected to the second transmission arm 42 using the second connecting piece 62.

[0203] As shown in FIG. 42, in the process of the relative folding of the first housing 10 and the second housing 30 from a flat state to an intermediate state, the rotating end 422 of the second transmission arm 42 rotates with respect to the main shaft 1, and the second flange 4211 of the second transmission arm 42 slides within the guide space 3121 of the first fixed bracket 31. That is, the second transmission arm 42 slides within the second sliding groove 312, and the second transmission arm 42 gradually approaches the first fixed bracket 31 and the first housing 10. The first fixed bracket 31 and the first housing 10 gradually approach the main shaft 1. The second rotating arm 52 is connected to the second transmission arm 42 using the second connection piece 62, and the second fixed bracket 32 and the second housing 30 gradually approach the main shaft 1. When the first housing 10 and the second housing 30 are in the intermediate state, the area of the overlapping surface between the rotating end 422 of the second transmission arm 42 and the main shaft 1 is the fifth wrap area, and the fifth wrap area is smaller than the fourth wrap area. The distance in the first direction P1 between the second transmission arm 42 and the end B' of the second sliding groove 312 is the fifth distance D5, and the fifth distance D5 is shorter than the fourth distance D4.

[0204] As shown in FIG. 43, in the process of relatively folding the first housing 10 and the second housing 30 from an intermediate state to a closed state, the rotating end portion 422 of the second transmission arm 42 rotates with respect to the main shaft 1, and the second flange 4211 of the second transmission arm 42 slides within the guide space 3121 of the first fixed bracket 31. That is, the second transmission arm 42 slides within the second sliding groove 312, and the second transmission arm 42 continues to approach the first fixed bracket 31 and the first housing 10. The first fixed bracket 31 and the first housing 10 continue to approach the main shaft 1. The second rotating arm 52 is connected to the second transmission arm 42 using the second connecting piece 62, and the second fixed bracket 32 and the second housing 30 continue to approach the main shaft 1. When the first housing 10 and the second housing 30 are in the closed state, the area of the overlapping surface between the rotating end portion 422 of the first transmission arm 42 and the main shaft 1 is the sixth wrap area, and the sixth wrap area is smaller than the fifth wrap area. The distance in the first direction P1 between the second transmission arm 42 and the end portion B' of the second sliding groove 312 is the sixth distance D6, and the sixth distance D6 is shorter than the fifth distance D5. For example, the sixth distance D6 may be close to zero.

[0205] In other words, in the process of relatively folding the first housing 10 and the second housing 30 from a flat state to a closed state, the overlapping region between the main shaft 1 and the rotating end portions 412 of the first transmission arm 41 and 422 of the second transmission arm 42 gradually decreases, and the distance between the first transmission arm 41 and the second housing 30 gradually decreases. The distance between the second transmission arm 42 and the first housing 10 gradually decreases, and the first housing 10 and the second housing 30 gradually approach the main shaft 1.

[0206] As shown in FIGS. 31 and 34, when the first housing 10 and the second housing 30 are relatively folded from a flat state to a closed state, the first transmission arm 41 rotates around the first rotation axis 41C. As shown in FIG. 34, the first rotation axis 41C about which the first transmission arm 41 rotates with respect to the main shaft 1 is close to the inner main shaft 15, far from the outer main shaft 14, close to the second fixed bracket 32, and far from the first fixed bracket 31. As shown in FIGS. 31 and 41, when the first housing 10 and the second housing 30 are relatively folded from a flat state to a closed state, the second transmission arm 42 rotates around the second rotation axis 42C. As shown in FIG. 41, the second rotation axis 42C about which the second transmission arm 42 rotates with respect to the main shaft 1 is close to the inner main shaft 15, far from the outer main shaft 14, close to the first fixed bracket 31, and far from the second fixed bracket 32.

[0207] In this embodiment, by setting the positions of the first rotation axis 41C and the second rotation axis 42C, the rotation mechanism 20 can more easily realize the in-shell tensile operation in the process of the folding device 100 changing from a flat state to a closed state, and the out-shell extrusion operation in the process of the folding device 100 changing from a closed state to a flat state, thereby realizing the deformation operation of using the flexible display 200 as the neutral plane.

[0208] In some embodiments, as shown in FIGS. 12 and 25, in the process of deploying or folding the folding device 100, the first transmission arm 41 rotates around the first rotation axis 41C, that is, the first transmission arm 41 rotates around the first rotation axis 41C with respect to the main shaft 1. The second transmission arm 42 rotates around the second rotation axis 42C, that is, the second transmission arm 42 rotates around the second rotation axis 42C with respect to the main shaft 1. The third transmission arm 40 rotates around the third rotation axis 40C, that is, the third transmission arm 40 rotates around the third rotation axis 40C with respect to the main shaft 1. The fourth transmission arm 50 rotates around the fourth rotation axis 50C, that is, the fourth transmission arm 50 rotates around the fourth rotation axis 50C with respect to the main shaft 1. The rotation axis 40C around which the third transmission arm 40 rotates with respect to the main shaft 1 is collinear with the rotation axis 42C around which the second transmission arm 42 rotates with respect to the main shaft 1. The rotation axis 50C around which the fourth transmission arm 50 rotates with respect to the main shaft 1 is collinear with the rotation axis 41C around which the first transmission arm 41 rotates with respect to the main shaft 1.

[0209] In this embodiment, the third transmission arm 40 and the rotation axis around which the second transmission arm 42 rotates with respect to the main shaft 1 are collinear, and the third transmission arm 40 is slidably connected to the third fixed bracket 33. The fourth transmission arm 50 and the rotation axis around which the first transmission arm 41 rotates with respect to the main shaft 1 are collinear, and the fourth transmission arm 50 is slidably connected to the fourth fixed bracket 34. Therefore, the movement of the fourth transmission arm 50 can be synchronized with the movement of the second transmission arm 42, and the movement of the fourth transmission arm 50 can be synchronized with the movement of the first transmission arm 41. Therefore, the structural design and connection relationship of the rotation mechanism 20 can be simplified, and the reliability of the rotation structure can be improved.

[0210] In this embodiment of the present application, as shown in FIGS. 33 to 34, the rotating end portion 412 of the first transmission arm 41 is rotatably connected to the main shaft 1, the sliding end portion 411 is slidably connected to the second fixed bracket 32, the second fixed bracket 32 is fixed to the second housing 30, the rotating end portion 422 of the second transmission arm 42 is rotatably connected to the main shaft 1, the sliding end portion 421 is connected to the first fixed bracket 31, and the first fixed bracket 31 is fixed to the first housing 10. Therefore, in the process of the first housing 10 rotating relative to the second housing 30, the first fixed bracket 31 rotates relative to the main shaft 1, the second transmission arm 42 rotates relative to the main shaft 1, the second transmission arm 42 slides relative to the first fixed bracket 31, the second fixed bracket 32 rotates relative to the main shaft 1, the first transmission arm 41 rotates relative to the main shaft 1, and the first transmission arm 41 slides relative to the second fixed bracket 32. Therefore, the folding device can be freely switched between a flat state and a closed state. Since the first housing 10 and the second housing 30 can be relatively unfolded into a flat state, the flexible display 200 can be in a flat form, realizing a large-screen display. Also, by relatively folding the first housing 10 and the second housing 30 into a closed state, the electronic device 1000 can be easily stored and carried. Further, when the rotating mechanism 20 is used to fold the first housing 10 and the second housing 30 relative to each other into a closed state, basically the first housing 10 and the second housing 30 can be completely closed, and there is no gap between the first housing 10 and the second housing 30, or the gap between the first housing 10 and the second housing 30 is small. Therefore, the integrity of the appearance of the folding device 100 is realized, and self-shielding of the appearance is realized. The integrity of the appearance of the electronic device 1000 to which the folding device 100 is applied is realized, improving the reliability of the product and the user experience.

[0211] Please refer to both FIG. 13 and FIG. 34. During the process of the first housing 10 rotating relative to the second housing 30, the rotating end portion 412 of the first transmission arm 41 is connected to the second end portion 512 of the first rotating arm 51 using the first connection piece 61. The rotating end portion 412 of the first transmission arm 41 is connected to the first end portion 611 of the first connection piece 61 using the rotating shaft 6111, and the rotating end portion 412 of the first transmission arm 41 can rotate around the first end portion 611 of the first connection piece 61. The second end portion 512 of the first rotating arm 51 is rotated using the rotating shaft 6121 and is connected to the second end portion 612 of the first connection piece 61, and the second end portion 512 of the first rotating arm 51 can rotate around the second end portion 612 of the first connection piece 61. Therefore, the first rotating arm 41, the first connection piece 61, and the first rotating arm 51 form a link structure. Similarly, as shown in FIG. 41, the second rotating arm 42, the second connection piece 62, and the second rotating arm 52 also form a link structure.

[0212] Please refer to FIGS. 12 and 41 together. In the process of the first housing 10 rotating relative to the second housing 30, since the first housing 10 moves synchronously with the first fixed bracket 31, the second housing 30 moves synchronously with the second fixed bracket 32, that is, the first fixed bracket 31 rotates relative to the second fixed bracket 32. Since the sliding end 412 of the second transmission arm 42 is slidably connected to the first fixed bracket 31, when the first fixed bracket 31 rotates, the sliding end 421 of the second transmission arm 42 slides within the second sliding groove 312, and the rotating end 422 of the second transmission arm 42 rotates relative to the main shaft 1. Referring to FIGS. 34 and 35, the first fixed bracket 31 is rotatably connected to the first rotating arm 51. When the first fixed bracket 31 rotates, the first rotating arm 51 rotates. Due to the restriction of the outer main shaft 14 on the first rotating arm 51 and the restriction groove 156 on the movement track of the rotating shaft 6121, the first rotating arm 51 can only move within the main shaft 1 along a predetermined track. The first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61, and the second rotating arm 52 is connected to the second transmission arm 42 using the second connection piece 62, and the two link structures are symmetrical to each other. Therefore, the rotation angle of the rotating end 412 of the first transmission arm 41 is equal to the rotation angle of the rotating end 422 of the second transmission arm 42, and the directions are opposite. The first housing 10 rotates synchronously with the rotating end 422 of the second transmission arm 42, and the second housing 30 rotates synchronously with the rotating end 412 of the first transmission arm 41, thereby ensuring the synchronization and consistency of the rotational movements of the first housing 10 and the second housing 30.

[0213] As shown in FIGS. 34 to 43, in the process of relatively unfolding the first housing 10 and the second housing 30 into a flat state, the first transmission arm 41 rotates relative to the main shaft 1, and the first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61.

[0214] The first fixed bracket 31 and the first housing 10 gradually move away from the main shaft 1. The second transmission arm 42 rotates with respect to the main shaft 1. The second rotating arm 52 is connected to the second transmission arm 42 using the second connection piece 62. The second fixed bracket 32 and the second housing 30 gradually move away from the main shaft 1. In the process of folding and closing the first housing 10 and the second housing 30 with respect to each other, the first transmission arm 41 rotates with respect to the main shaft 1, the first rotating arm 51 is connected to the first transmission arm 41 using the first connection piece 61, and the first fixed bracket 31 and the first housing 10 gradually approach the main shaft 1. The second transmission arm 42 rotates with respect to the main shaft 1, the second rotating arm 52 is connected to the second transmission arm 42 using the second connection piece 62, and the second fixed bracket 32 and the second housing 30 gradually approach the main shaft 1. Therefore, in the process of relatively expanding the first housing 10 and the second housing 30, the rotation mechanism 20 can move the first housing 10 away from the main shaft 1 and move the second housing 30 away from the main shaft 1. In the process of relatively folding the first housing 10 and the second housing 30, the first housing 10 moves in a direction approaching the main shaft 1, and the second housing 30 moves in a direction approaching the main shaft 1. In other words, the rotation mechanism 20 can realize the pulling-in operation of the housing inward in the process of the folding device 100 changing from a flat state to a closed state and the pushing-out operation of the housing outward in the process of the folding device 100 changing from a closed state to a flat state. Therefore, in the process of expanding or folding the folding device 100, the deformation movement of the flexible display 200 as the neutral plane can be realized, thereby reducing the risk of pulling or compressing the flexible display 200, maintaining the flexible display 200 at a certain length, protecting the flexible display 200, improving the reliability of the flexible display 200, and thereby enabling the flexible display 200 and the electronic device 1000 to have a relatively long service life.

[0215] As shown in FIGS. 34 and 41, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the first support plate 21 is flush with the second support plate 22. The first support plate 21 is disposed between the first fixed bracket 31 and the main shaft 1, and the second support plate 22 is disposed between the second fixed bracket 32 and the main shaft 1. The first support plate 21, the main shaft 1, and the second support plate 22 can jointly form a complete planar support for the bent portion 2002 of the flexible display 200. As shown in FIGS. 40 and 43, when the first housing 10 and the second housing 30 are relatively folded to a closed state, the first support plate 21 is stacked on the side away from the second fixed bracket 32 with respect to the first fixed bracket 31. The second support plate 22 is stacked on the side away from the first fixed bracket 31 with respect to the second fixed bracket 32. The first support plate 21 and the second support plate 22 are slidable and accommodatable with respect to the first housing 10 and the second housing 30 respectively, whereby the main shaft 1 is exposed and forms a complete support for the bent portion 2002 of the flexible display 200. In other words, when the folding device 100 is in a flat state or a closed state, the rotation mechanism 20 can completely support the bent portion 2002 of the flexible display 200, thereby protecting the flexible display 200 and improving the user experience.

[0216] As shown in FIGS. 34 and 41, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the first shielding plate 23 is flush with the second shielding plate 24. The first shielding plate 23 is disposed between the first fixed bracket 31 and the main shaft 1, and can shield the gap between the first fixed bracket 31 and the main shaft 1. The second shielding plate 24 is disposed between the second fixed bracket 32 and the main shaft 1, and can shield the gap between the first fixed bracket 31 and the main shaft 1. Therefore, the folding device 100 can achieve self-shielding that helps improve the appearance integrity, reduce the risk of external dust and debris entering the rotating mechanism 20, and ensure the reliability of the folding device 100. As shown in FIGS. 40 and 43, when the first housing 10 and the second housing 30 are folded relative to each other to a closed state, the first shielding plate 23 can be housed between the first fixed bracket 31 and the first housing 10, and the second shielding plate 24 can be housed between the second fixed bracket 32 and the second housing 30, thereby achieving avoidance. In this way, the folding device 100 can be smoothly folded into a closed form and has high mechanism reliability.

[0217] Furthermore, as shown in FIG. 28, since the first support plate 21 and the first shielding plate 23 are fixed to the sliding end portion 411 of the first transmission arm 41, the first support plate 21 and the first shielding plate 23 move together with the sliding end portion 411 of the first transmission arm 41. The second support plate 22 and the second shielding plate 24 are fixed to the sliding end portion 421 of the second transmission arm 42, and the second support plate 22 and the second shielding plate 24 move together with the sliding end portion 421 of the second transmission arm. Therefore, in the process of the folding device 100 changing from the closed state to the flat state and in the process of the folding device 100 changing from the flat state to the closed state, the first support plate 21 and the second support plate 22 gradually approach the main shaft 1 or gradually move away from the main shaft 1, so that the folding device 100 can fully support the flexible display 200 in various forms, thereby improving the reliability and service life of the flexible display 200 and the electronic device 1000. In the process of switching the folding device 100 from the closed state to the flat state or in the process of switching the folding device 100 from the flat state to the closed state, the first shielding plate 23 and the second shielding plate 24 gradually approach the main shaft 1 or gradually move away from the main shaft 1, so that the folding device 100 in various forms adapts to the form of the rotation mechanism 20 and realizes self-shielding. In this way, the reliability of the mechanism is high.

[0218] Since both the first support plate 21 and the first shielding plate 23 are fixed to the sliding end portion 411 of the first transmission arm 41, and both the second support plate 22 and the second shielding plate 24 are fixed to the sliding end portion 421 of the second transmission arm 42, the first transmission arm 41 and the second transmission arm 42 not only control the rotational movement of the first housing 10 and the second housing 30, but also control the expansion and contraction of the first support plate 21, the first shielding plate 23, the second support plate 22, and the second shielding plate. Therefore, the rotation mechanism 20 is highly integrated, the overall connection relationship is simple, and the reliability of the mechanism is high.

[0219] In some embodiments, as shown in FIGS. 12 to 14, the rotating mechanism 20 can further include a first limiting component 81. The first limiting component 81 is attached to the sliding end portion 411 of the first transmission arm 41, and the first limiting component 81 is clamped to the second fixed bracket 32. In this embodiment, the first limiting component 81 is configured to limit the relative positional relationship between the first transmission arm 41 and the second fixed bracket 32. Without a large external force, the first transmission arm 41 and the second fixed bracket 32 can maintain the preset relative positional relationship, the rotating mechanism 20 can stay at the preset angle, and the rotating device can maintain a flat state or a closed state. In this way, the user experience of the folding device 100 and the electronic device 1000 is improved.

[0220] FIG. 44 is a schematic exploded view of the first limiting component 81 shown in FIGS. 12 to 14.

[0221] As shown in FIG. 44, in some embodiments, the first limiting component 81 includes a second bracket 811 and a third elastic component 812. The second bracket 811 relates to a rigid structure and is difficult to deform under an external force. The second bracket 811 includes a control component 8111 and a contact component 8112. The contact component 8112 is configured to contact an external mechanical component and limit this mechanical component. The control component 8111 is configured to control the position of the contact component 8112. For example, the control component 8111 includes a substrate 8113 and a plurality of guide posts 8114. The plurality of guide posts 8114 are fixed to one side of the substrate 8113 and are spaced apart from each other. The contact component 8112 is fixed to the opposite side of the substrate 8113. The third elastic component 812 relates to an elastic structure and is easy to deform under an external force. One end of the third elastic component 812 is attached to the control component 8111 of the second bracket 811. For example, the third elastic component 812 can include a plurality of springs 8121, and the plurality of springs 8121 are sleeved on the plurality of guide posts 8114 in a one-to-one correspondence.

[0222] As shown in FIG. 13, the sliding end portion 411 of the first transmission arm 41 has a second mounting groove 4112, and the first limiting component 81 is installed in the second mounting groove 4112. The other end of the third elastic component 812 (that is, the end away from the control component 8111) abuts against the groove wall of the second mounting groove 4112, and the third elastic component 812 is in a compressed state. The abutting component 8112 of the second bracket 811 partially protrudes from the second mounting groove 4112 and clamps the second fixed bracket 32.

[0223] As shown in FIG. 44, in some embodiments, the first limiting component 81 can further include a first cushioning component 813, and the first cushioning component 813 is attached to the abutting component 8112 of the second bracket 811. The first cushioning component 813 may be made of a material with relatively low rigidity (for example, rubber). When the first cushioning component 813 receives an external force, it can absorb the impact force through deformation and achieve cushioning. In the first limiting component 81, the first cushioning component 813 is arranged to relieve the stress between the abutting component 8112 and the mechanical component (that is, the second fixed bracket 32), and improve the reliability of the limiting structure.

[0224] As shown in FIGS. 33, 36, and 39, for example, the second fixed bracket 32 further includes a first concave region 325, a second concave region 326 (the first concave), and a first horizontal region 327 (the first convex). The first concave region 325, the second concave region 326, and the first horizontal region 327 are all connected to the first sliding groove 322. The distance in the first direction P1 between the first concave region 325 and the end A of the first sliding groove 322 is shorter than the distance in the first direction P1 between the second concave region 326 and the end A of the first sliding groove 322. The first horizontal region 327 is located between the first concave region 325 and the second concave region 326.

[0225] As shown in FIG. 33, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the contact part 8112 of the first limiting part 81 is partially clamped in the first concave region 325. As shown in FIG. 36, when the first housing 10 and the second housing 30 rotate (unfold or fold) relative to each other to an intermediate state, the contact part 8112 of the first limiting part 81 gradually moves to the first horizontal region 327. As shown in FIG. 39, when the first housing 10 and the second housing 30 are folded relative to each other to a closed state, the contact part 8112 of the first limiting part 81 is partially clamped in the second concave region 326.

[0226] As shown in FIG. 33, when folding the electronic device 1000, in the process that the contact part 8112 of the first limiting part 81 moves from the first concave region 325 to the first horizontal region 327, the elastic shape deformation amount of the third elastic part 812 of the first limiting part 81 gradually increases. Since there is a specific narrow angle with respect to the length direction of the main shaft 1 on the first connection surface 3251 between the first concave region 325 and the first horizontal region 327, two partial forces are respectively generated on the first connection surface 3251, and a third force F3 is applied to the first connection surface 3251. F 3x is the component force perpendicular to the length direction of the main shaft 1, and F 3y is the component force parallel to the length direction of the main shaft 1. In the process that the first limiting part 81 moves from the first concave region 325 to the first horizontal region 327, that is, when folding the first housing 10 and the second housing 30 relative to each other, the component force F 3x perpendicular to the length direction of the main shaft 1 and away from the direction of the main shaft 1 generates a torque that hinders the rotation of the second housing 30, thereby giving a tactile feeling during the folding process of the electronic device 1000.

[0227] As shown in FIG. 39, as the electronic device 1000 continues to be folded and the contact component 8112 of the first limiting component 81 moves from the first horizontal region 327 to the second concave region 326, the elastic shape deformation amount of the third elastic component 812 of the first limiting component 81 gradually decreases. Since there is a specific narrow angle with respect to the length direction of the main shaft 1 on the second connection surface 3261 between the second concave region 326 and the first horizontal region 327, two partial forces are generated on the second connection surface 3261 respectively, and the force F 4x is the component force perpendicular to the length direction of the main shaft 1, and F 4y is the component force parallel to the length direction of the main shaft 1. As the first limiting component 81 moves from the first horizontal region 327 to the second concave region 326, that is, when the first housing 10 and the second housing 30 continue to be folded relative to each other, the component force F 4x perpendicular to the length direction of the main shaft 1 and facing the direction of the main shaft 1 can provide a torque for assisting the rotation of the second housing 30, and can push and rotate the second housing 30.

[0228] As shown in FIG. 39, when the electronic device 1000 is unfolded, as the contact component 8112 of the first limiting component 81 moves from the second concave region 326 to the first horizontal region 327, the elastic shape deformation amount of the third elastic component 812 of the first limiting component 81 gradually increases. In this case, the component force F 4x perpendicular to the length direction of the main shaft assembly and facing the direction of the main shaft 1 generates a torque that hinders the rotation of the second housing 30, thereby giving a tactile feeling during the folding process of the electronic device 1000. As shown in FIG. 33, as the electronic device 1000 continues to be unfolded and the contact component 8112 of the first limiting component 81 moves from the first horizontal region 327 to the first concave region 325, the shape deformation amount of the third elastic component 812 of the first limiting component 81 gradually decreases. In this case, the component force F 3x perpendicular to the length direction of the main shaft 1 and away from the direction of the main shaft 1 can provide a torque for assisting the rotation of the second housing 30, and can push and rotate the second housing 30.

[0229] To make it easier to understand the force applied during the rotation of the first housing 10 relative to the second housing 30, the force applied to the first connection surface 3251 during the movement of the contact part 8112 of the first limiting part 81 from the first concave region 325 to the first horizontal region 327 will be described as an example.

[0230] FIG. 45 is a schematic diagram of the force applied during the folding process of the electronic device 1000. The center of the circle C is the center of rotation of the electronic device 1000, that is, the center of the circle during the rotation of the neutral plane of the flexible display 200. When folding the electronic device 1000, during the process that the first limiting part 81 moves from the first concave region 325 to the first horizontal region 327, the external acting force F of the folded electronic device 1000 generates a partial force F b which generates, and F b is a tangent to the circle centered at C, and F b generates a torque that presses the first housing 10 to rotate relative to the second housing 30. The component force F perpendicular to the longitudinal direction of the main shaft 1 and away from the main shaft 1 received by the first connection surface 3251 3x generates a component force F a which generates, and F a is also a tangent to the circle centered at C, and Fa generates a torque that hinders the relative rotation of the first housing 10 and the second housing 30. Therefore, during the process that the first housing 10 rotates relative to the second housing 30 and the first limiting part 81 moves from the first concave region 325 to the first horizontal region 327, the component force F perpendicular to the longitudinal direction of the main shaft 1 and away from the longitudinal direction of the main shaft 1 3x generates a torque that hinders the relative rotation of the housings.

[0231] Based on the same or similar principle as described above, during the process of folding or unfolding the electronic device 1000, the component force perpendicular to the longitudinal direction of the main shaft 1 can generate a torque that assists or hinders the relative rotation of the housings. Details will not be described again here.

[0232] Since the third elastic component 812 of the first limiting component 81 can be deformed under an external force, the first limiting component 81 can smoothly move between the first concave region 325, the first horizontal region 327, and the second concave region 326 with respect to the second fixed bracket 32, thereby improving the limiting reliability between the first transmission arm 41 and the second fixed bracket 32.

[0233] In some other embodiments, the second fixed bracket 32 can alternatively include only the first concave region 325 or only the second concave region 326. The positions of the first concave region 325 and / or the second concave region 326 can also be designed in other forms. This is not strictly limited in the present application.

[0234] In some other embodiments, the part related to the second fixed bracket 32 and cooperating with the first limiting component 81 may be an elastic structure, or elastic protrusions may be arranged. Based on the same or similar reasons as above, during the process of folding or unfolding the electronic device 1000, the force in the direction perpendicular to the length direction of the main shaft 1 acting on the second fixed bracket 32 can provide a tactile feeling during the process of folding the electronic device 1000.

[0235] In some embodiments, as shown in FIGS. 12 to 14, the rotation mechanism 20 can further include a second limiting component 82. The second limiting component 82 is attached to the sliding end portion 421 of the second transmission arm 42, and the second limiting component 82 is clamped to the first fixed bracket 31. In this embodiment, the second limiting component 82 is configured to limit the relative positional relationship between the second transmission arm 42 and the first fixed bracket 31, so that the second transmission arm 42 and the first fixed bracket 31 can maintain a preset relative positional relationship without a large external force being applied, the rotation mechanism 20 can stay at a preset angle, and the rotating device can maintain a flat state or a closed state. In this way, the user experience of the folding device 100 and the electronic device 1000 is improved.

[0236] For example, the structure of the second limiting component 82 is the same as that of the first limiting component 81, reducing the types of materials for the rotating mechanism 20 and reducing the design difficulty and cost of the rotating mechanism 20. The specific structure of the second limiting component 82 is not described in this embodiment of the present application. In some other embodiments, the structure of the second limiting component 82 may alternatively be different from that of the first limiting component 81.

[0237] In the foregoing embodiments, it will be understood that the mounting structure of the limiting component is shown by way of example. The limiting component in this embodiment of the present application can alternatively use another elastic structure. For example, an elastic rubber block can be used. This is not strictly limited in the present application.

[0238] For example, as shown in FIGS. 13 and 14, the first fixing bracket 31 further includes a third recessed region 315, a fourth recessed region 316 (second recess), and a second horizontal region 317 (second convex portion). The third recessed region 315, the fourth recessed region 316, and the second horizontal region 317 are all connected to the second sliding groove 312. The distance in the first direction P1 between the third recessed region 315 and the end A' of the second sliding groove 312 is shorter than the distance in the first direction P1 between the fourth recessed region 316 and the end A' of the second sliding groove 312. The second horizontal region 317 is located between the third recessed region 315 and the fourth recessed region 316. When the first housing 10 and the second housing 30 are relatively unfolded into a flat state, the second limiting component 82 is partially clamped in the third recessed region 315. When the first housing 10 and the second housing are relatively rotated (unfolded or folded) to an intermediate state, the second limiting component 82 gradually moves to the second horizontal region 317. When the first housing 10 and the second housing 30 are relatively folded into a closed state, the second limiting component 82 is partially clamped in the fourth recessed region 316.

[0239] Based on the same or similar reasons as above, when the electronic device 1000 is deployed or folded, the third recessed area 315 and the fourth recessed area 316 can be arranged to provide a torque that impedes or assists the rotation of the first housing 10.

[0240] In some other embodiments, the first fixed bracket 31 can alternatively include only the third recessed area 315 or only the fourth recessed area 316. The positions of the third recessed area 315 and / or the fourth recessed area 316 can also be designed in other forms. This is not strictly limited in this application.

[0241] In some other embodiments, the portion related to the first fixed bracket 31 and cooperating with the second limiting component 82 may be an elastic structure, or elastic protrusions may be arranged. During the process of folding or deploying the electronic device 1000, the force perpendicular to the length direction of the main shaft 1 applied to the first fixed bracket 31 can provide a tactile feeling during the process of folding the electronic device 1000.

[0242] FIG. 46 is a schematic diagram showing the fitting relationship between the synchronous damping member 7 and the main shaft 1 shown in FIG. 14.

[0243] As shown in FIGS. 14 and 46, in some embodiments, the rotating end 712 of the first synchronous swing arm 71, the rotating end 722 of the second synchronous swing arm 72, and the gear set 73 cooperate with the arc-shaped groove 142b of the outer main shaft 14 and the arc-shaped protrusion 153c of the inner main shaft 15 to realize the rotational connection with the main shaft 1. The fourth elastic component 76 cooperates with the arc-shaped groove 142c of the outer main shaft 14 and the arc-shaped protrusion 153c of the inner main shaft 15.

[0244] Please refer to FIGS. 47 to 49. FIG. 47 is a schematic cross-sectional view of the position of the synchronization component 70 corresponding to the flat state of the folding device 100 shown in FIG. 2 (i.e., the C-C cross-section shown in FIG. 12), and FIG. 48 is a schematic cross-sectional view of the position of the synchronization component 70 corresponding to the intermediate state of the folding device 100 shown in FIG. 2 (i.e., the C-C cross-section shown in FIG. 12). FIG. 49 is a schematic cross-sectional view of the position of the synchronization component 70 corresponding to the closed state of the folding device 100 shown in FIG. 2 (i.e., the C-C cross-section shown in FIG. 12). FIGS. 47 to 49 show the position change of the synchronization component during the process of the folding device 100 switching from the flat state to the closed state.

[0245] As shown in FIG. 47, referring to both FIGS. 14 and 33, when the first housing 10 and the second housing 30 are relatively unfolded to a flat state, the third flange 7111 of the sliding end 711 of the first synchronization swing arm 71 is slidably connected to the guide space 3131 of the third sliding groove 313 of the first fixed bracket 31. The third sliding groove has a C end close to the main shaft 1 and a D end away from the main shaft 1. That is, the distance in the first direction P1 between the C end of the third sliding groove 313 and the main shaft 1 is shorter than the distance in the first direction P1 between the D end of the third sliding groove 313 and the main shaft 1. The distance in the first direction P1 between the first synchronization swing arm 71 and the end D of the third sliding groove 313 is the seventh distance D7. Similarly, the fourth sliding groove 323 has a C' end close to the main shaft 1 and a D' end away from the main shaft 1. The distance in the third direction P3 between the second synchronization swing arm 72 and the second housing 30 at the D' end of the fourth sliding groove 323 is the eighth distance D8. For example, the seventh distance D7 may be substantially equal to the eighth distance D8, thereby ensuring the synchronization and consistency of the relative rotation of the first housing 10 and the second housing 30.

[0246] As shown in FIG. 48, referring to both FIGS. 14 and 36, in the process of relatively folding the first housing 10 and the second housing 30 from a flat state to an intermediate state, the third flange 7111 of the sliding end portion 711 of the first synchronous swing arm 71 slides within the guide space 3131 of the first fixed bracket 31. That is, the first synchronous swing arm 71 slides within the third sliding groove 313, and the first synchronous swing arm 71 gradually approaches the first fixed bracket 31 and the first housing 10. The fourth flange 7211 of the sliding end portion 721 of the second synchronous swing arm 72 slides within the guide space 3231 of the second fixed bracket 32. That is, the second synchronous swing arm 72 slides within the fourth sliding groove 323, and the second synchronous swing arm 72 gradually approaches the second fixed bracket 32 and the second housing 30. When the first housing 10 and the second housing 30 are folded relative to each other into an intermediate state, the distance in the first direction P1 between the first synchronous swing arm 71 and the end D of the third sliding groove 313 is the ninth distance D9, and the ninth distance D9 is shorter than the seventh distance D7. The distance in the third direction P3 between the second synchronous swing arm 72 and the end D' of the fourth sliding groove 323 is the tenth distance D10, and the tenth distance D10 is shorter than the eighth distance D8. For example, the ninth distance D9 may be substantially equal to the tenth distance D10.

[0247] As shown in FIG. 49, referring to both FIGS. 14 and 39, in the process of relatively folding the first housing 10 and the second housing 30 from an intermediate state to a closed state, the first synchronous swing arm 71 continues to approach the first fixed bracket 31 and the first housing 10, and the second synchronous swing arm 72 continues to approach the second fixed bracket 32 and the second housing 30. When the first housing 10 and the second housing 30 are folded relative to each other to a closed state, the distance in the first direction P1 between the first synchronous swing arm 71 and the D end of the third sliding groove 313 is the 11th distance D11, and the 11th distance D11 is shorter than the 9th distance D9. The distance in the third direction P3 between the second synchronous swing arm 72 and the D' end of the fourth sliding groove 323 is the 12th distance D12, and the 12th distance D12 is shorter than the 10th distance D10. For example, the 11th distance D11 and / or the 12th distance D12 may be close to zero.

[0248] In this embodiment, in the process of deploying and folding the folding device 100, the rotating end 712 of the first synchronous swing arm 71 engages with the rotating end 722 of the second synchronous swing arm 72 using the gear set 73. Both the rotating end 712 of the first synchronous swing arm 71 and the rotating end 722 of the second synchronous swing arm 72 are rotatably connected to the main shaft 1, the sliding end 711 of the first synchronous swing arm 71 is slidably connected to the first fixed bracket 31, and the sliding end 721 of the second synchronous swing arm 72 is slidably connected to the second fixed bracket 32. Therefore, in the process of folding or deploying the first housing 10 and the second housing 30 relative to each other, the first synchronous swing arm 71 and the second synchronous swing arm 72 can control the rotation angles of the first fixed bracket 31 and the second fixed bracket 32 with respect to the main shaft 1 to be constant, whereby the rotation movements of the first housing 10 and the second housing 30 are synchronized and consistent. The symmetry between the folding operation and the deployment operation of the folding device 100 is better, which helps to improve the user experience.

[0249] The first synchronous swing arm 71 is rotatably connected to the main shaft 1 and slidably connected to the first fixed bracket 31, that is, a connecting rod sliding block structure is formed. The second synchronous swing arm 72 is rotatably connected to the main shaft 1 and slidably connected to the second fixed bracket 32, that is, a connecting rod sliding block structure is formed. The synchronization and consistency of the rotational movements of the first housing 10 and the second housing 30 can be well controlled by using a connecting rod sliding block structure that meshes with each other using a gear set 73.

[0250] FIG. 50 is a schematic exploded view of the synchronous damping member 7 shown in FIGS. 12 to 14.

[0251] In some embodiments, the synchronous damping member 7 of the rotation mechanism 20 includes a synchronous component 70, a first connecting cam 74, a second connecting cam 75, a fourth elastic component 76, a snap ring 77, a snap spring 78, and a plurality of coupling shafts 79. For example, the synchronous component 70 includes a first synchronous swing arm 71, a second synchronous swing arm 72, and a gear set 73. The rotating end portion 712 of the first synchronous swing arm 71 engages with the rotating end portion 722 of the second synchronous swing arm 72 using the gear set 73. The gear set 73 includes a first gear 731 and a second gear 732, and the first gear 731 and the second gear 732 are engaged with each other.

[0252] The coupling shaft 79 includes a guide post 791 and a stop block 792. The snap ring 77, the fourth elastic component 76, the first connecting cam 74, the synchronization component 70, the second connecting cam 75, and the snap spring 78 are sequentially sleeved on the guide posts 791 of the plurality of coupling shafts 79. The end of the snap ring 77 abuts against the stop block 792 of the coupling shaft 79. The guide post 791 of the coupling shaft 79 includes a limiting groove, and the snap spring 78 includes a plurality of grooves 781. The plurality of grooves 781 of the snap spring 78 are clamped in a one-to-one correspondence with the limiting grooves 7911 of the plurality of coupling shafts 79. For example, the fourth elastic component 76 can include a plurality of springs 761, and the fourth elastic component 76 may be in a compressed state to apply a preload.

[0253] For example, the rotating end 712 of the first synchronous swing arm 71, the first gear 731, the second gear 732, and the rotating end 722 of the second synchronous swing arm 72 are arranged in an arc shape. That is, the rotation axes of the rotating end 712 of the first synchronous swing arm 71, the rotation axis of the first gear 731, the rotation axis of the second gear 732, and the rotation axis of the rotating end 722 of the second synchronous swing arm 72 are arranged in an arc shape. In this embodiment, by arranging a part of the structure of the synchronous damping member 7 attached to the main shaft 1 in an arc shape, the internal space of the main shaft 1 can be utilized to the maximum extent, thereby helping to improve the compactness of the component arrangement of the electronic device 1000 and reducing the volume of the electronic device 1000.

[0254] FIG. 51 is a schematic diagram showing the structure of the first connecting cam 74 shown in FIG. 50, and FIG. 52 is a schematic diagram showing the structure of the first gear 731 shown in FIG. 50.

[0255] As shown in FIG. 51, the first connecting cam 74 has a first end face 741 facing the synchronization element 70, and the first end face 741 includes a plurality of first concave faces 741a and first convex faces 741b spaced apart from each other. As shown in FIG. 52, the two faces of the first gear 731 cooperating with the first connecting cam 74 and the second connecting cam 75 each include a second concave face 731a and a second convex face 731b spaced apart from each other.

[0256] FIG. 53 is a schematic diagram showing the fitting relationship between the first connecting cam 74 and the first gear 731 when the first housing 10 and the second housing 30 are relatively unfolded and flattened. As shown in FIGS. 50 to 53, the first concave face 741a of the first connecting cam 74 abuts against the second convex face 731b of the first gear 731, and the first convex face 741b of the first connecting cam 74 abuts against the second concave face 731a of the first gear 731. In this case, the fourth elastic component 76 is in a compressed state, and the elastic shape deformation amount of the fourth elastic component 76 is the first form deformation.

[0257] FIG. 54 is a schematic diagram showing the fitting relationship between the first connecting cam 74 and the first gear 731 when the first housing 10 and the second housing 30 start to rotate relative to each other. The first convex face 741b of the first connecting cam 74 slides relative to the second convex face 731b of the first gear 731, and the first convex face 741b partially abuts against the second convex face 731b. In this case, the elastic shape deformation amount of the fourth elastic component 76 is the second shape deformation amount, and the second shape deformation amount is larger than the first shape deformation amount. Using the second shape deformation amount of the fourth elastic component 76, the first convex face 741b pushes the second convex face 731b. By the cooperation between the first convex face 741b and the second convex face 731b, torque can be provided to prevent the relative rotation of the housing, thereby improving the feel of touch during the folding process of the electronic device 1000.

[0258] As shown in FIG. 54, since the second convex surface 731b has a specific included angle with the longitudinal direction of the main shaft 1, when the first housing 10 rotates with respect to the second housing 30, the first convex surface 741b slides with respect to the second convex surface 731b, and the elastic force generated by the deformation of the fourth elastic component 76 is transmitted to the second convex surface 731b of the first gear 731 through the first convex surface 741b of the first connecting cam 74, and the force applied to the second convex surface 731b is F5. F 5x is the component force orthogonal to the longitudinal direction of the main shaft 1, and F 5y is the component force parallel to the longitudinal direction of the main shaft 1. When the first housing 10 rotates with respect to the second housing 30, the component force F 5x applied to the second convex surface 731b, which is orthogonal to the longitudinal direction of the main shaft 1 and in the direction away from the main shaft 1, generates a torque that hinders the relative rotation of the housings. For the force applied during the folding process of the electronic device 1000, refer to the descriptions corresponding to FIGS. 45 and 45. Details will not be described again here.

[0259] The structure of the second connecting cam 75 may be the same as the structure of the first connecting cam 74, and the structure of the second gear 732 may be the same as the structure of the first gear 731. Specific structures will not be described in detail in this embodiment. The fitting relationship between the first gear 731 and the second connecting cam 75, the fitting relationships between the second gear 732 and the first connecting cam 74 and between the second gear 732 and the second connecting cam 75, the fitting relationships between the rotating end 712 of the first synchronous swing arm 71 and the first connecting cam 74 and between the second rotating end 712 and the second connecting cam 75, and the fitting relationships between the rotating end 722 of the second synchronous swing arm 72 and the first connecting cam 74 and between the rotating end 722 and the second connecting cam 75 are the same as or similar to the fitting relationship between the first gear 731 and the first connecting cam 74. For specific structures, refer to the foregoing descriptions. Details will not be described again here.

[0260] As can be seen from the above description, by the cooperation of the plurality of arranged convex surfaces and concave surfaces, it is possible to apply a torque that prevents the relative rotation of the first housing 10 and the second housing 30, thereby enhancing the tactile sensation during the folding process of the electronic device 1000.

[0261] FIG. 55 is a schematic view showing a partial structure of the synchronous damping member 7 shown in FIG. 50. Please refer to FIGS. 14 and 54 together. When the first convex surface 741b of the first connecting cam 74 slides relative to the second convex surface 731b of the first gear 731, the convex surfaces between the first connecting cam 74 and the first gear 731 press against each other, generating a first displacement M. Correspondingly, the second connecting cam 75 also slides relative to the first gear 731, and the second displacement N is correspondingly generated by the extrusion of the convex surface between the second connecting cam 75 and the first gear 731. For example, the second displacement value N may be equal to the first displacement value M. As shown in FIG. 55, the distance between the snap spring 78 and the snap spring 77 is constant and invariant, and is a constant length S. Therefore, the first displacement N generated by extruding the convex surface of the first gear 731 and the convex surface of the first connecting cam 74, and the second displacement N generated by extruding the convex surface of the first gear 731 and the convex surface of the second connecting cam 75 are converted into the elastic shape deformation amount of the fourth elastic component 76. Using the above structure, the elastic shape deformation amount of the fourth elastic component 76 can be increased, so that when the first convex surface 741b and the second convex surface 731b are extruded against each other, the force F5 applied to the first gear 731 becomes larger, and the component force F of F5 perpendicular to the length direction of the main shaft 1 5x correspondingly becomes larger. Therefore, when the first housing 10 and the second housing 30 rotate relative to each other, in order to prevent the relative rotation of the housings, a larger torque is generated, thereby further enhancing the tactile sensation of the electronic device 1000.

[0262] Similarly, when the concave and convex surfaces of the first connecting cam 74 and the second connecting cam 75 cooperate with the concave and convex surfaces of the first gear 731, the second gear 732, the rotating end 712 of the first synchronous swing arm 71, and the rotating end 722 of the second synchronous swing arm 72, a greater torque can be applied, thereby enhancing the tactile sensation of the electronic device 1000 during the folding and unfolding processes.

[0263] In this embodiment of the present application, when the electronic device 1000 is unfolded from the closed state to the flat state, the force applied in the first direction to the first non-bending portion 2001 of the flexible display 200 is greater than the force in the first direction applied to the first non-bending portion 2001 in the closed state, and the force in the third direction applied to the second non-bending portion 2003 is greater than the force in the third direction applied to the second non-bending portion 2003 in the closed state. Therefore, when the electronic device is unfolded from the closed state to the flat state, the phenomenon of layer misalignment of the flexible display 200 can be alleviated, the recovery of wrinkles of the flexible display 200 is promoted, and thereby the flattening effect of the flexible display is improved.

[0264] The foregoing description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any deformation or substitution that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall be within the protection scope of the present application. When there is no contradiction, the embodiments of the present application and the features of the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A folding device including a first housing (10), a rotating mechanism (20), and a second housing (30) connected in sequence, wherein the rotating mechanism (20) is deformable so that the folding device can be in a flat state or a folded state, The rotating mechanism (20) includes a main shaft (1), a first fixed bracket (31), a second fixed bracket (32), a first transmission arm (41), a first connection piece (61), a first rotating arm (51), a second transmission arm (42), a second connection piece (62), and a second rotating arm (52), At least a part of the first fixed bracket (31) is fixed to the first housing (10), and at least a part of the second fixed bracket (32) is fixed to the second housing (30), The first transmission arm (41) includes a sliding end (411) and a rotating end (412). The sliding end (411) of the first transmission arm (41) is slidably connected to the second fixed bracket (32), the rotating end (412) of the first transmission arm (41) is rotatably connected to the main shaft (1), the rotating end (412) of the first transmission arm (41) is rotatably connected to the first connection piece (61), the first connection piece (61) is rotatably connected to the second end (512) of the first rotating arm (51), and the first end (511) of the first rotating arm (51) is rotatably connected to the first fixed bracket (31), The second transmission arm (42) includes a sliding end (421) and a rotating end (422). The sliding end (421) of the second transmission arm (42) is slidably connected to the first fixed bracket (31), the rotating end (422) of the second transmission arm (42) is rotatably connected to the main shaft (1), the rotating end (422) of the second transmission arm (42) is rotatably connected to the second connection piece (62), the second connection piece (62) is rotatably connected to the second end (522) of the second rotating arm (52), and the first end (521) of the second rotating arm (52) is rotatably connected to the second fixed bracket (32). Folding device.

2. The main shaft (1) includes an outer shaft (14) and an inner shaft (15), and the outer shaft (14) is fixedly connected to the inner shaft (15). The inner shaft (15) includes a first arc-shaped protrusion (153a) and a second arc-shaped protrusion, the outer shaft (14) includes a first arc-shaped groove (142a) and a second arc-shaped groove, the rotating end (412) of the first transmission arm (41) is arc-shaped, and is rotatably connected to the first arc-shaped protrusion (153a) and the first arc-shaped groove (142a), the rotating end (422) of the second transmission arm (42) is arc-shaped, and is rotatably connected to the second arc-shaped protrusion and the second arc-shaped groove. The folding device according to claim 1.

3. The first rotating arm (51) is connected to the first connection piece (61) via a second rotating shaft (6121), the outer shaft (14) and the inner shaft (15) are surrounded to form an arc-shaped groove (156), and the second rotating shaft (6121) cooperates with the arc-shaped groove (156) in a sliding manner. The folding device according to claim 2.

4. The second fixed bracket (32) includes a first sliding groove (322), and the first fixed bracket (31) includes a second sliding groove (312). The fact that the sliding end (411) of the first transmission arm (41) is slidably connected to the second fixed bracket (32) The sliding end (411) of the first transmission arm (41) is slidably connected to the first sliding groove (322), and In the process of the folding device switching from the flat state to the folded state, the sliding end (411) of the first transmission arm (41) slides with respect to the first sliding groove (322), including The fact that the sliding end (421) of the second transmission arm (42) is slidably connected to the first fixed bracket (31) The sliding end (421) of the second transmission arm (42) is slidably connected to the second sliding groove (312), and In the process of the folding device switching from the flat state to the folded state, the sliding end (421) of the second transmission arm (42) slides with respect to the second sliding groove (312). The folding device according to claim 1.

5. The first transmission arm (41) further includes a first limiting component (81), and the first limiting component (81) is disposed at the sliding end portion (411) of the first transmission arm (41). A first convex portion and a first concave portion are spaced apart from each other and disposed on the side wall of the first sliding groove (322). The first limiting component (81) includes a second elastic component. The sliding end portion (411) of the first transmission arm (41) slides to a first position with respect to the first sliding groove (322), and the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a first compression amount. The folding device according to claim 4, wherein the sliding end portion (411) of the first transmission arm (41) slides to a second position with respect to the first sliding groove (322), the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a second compression amount, and the first compression amount is greater than the second compression amount.

6. The first transmission arm (41) further includes a first limiting component (81), and the first limiting component (81) is disposed at the sliding end portion (411) of the first transmission arm (41). A second limiting component (82) is disposed at the sliding end portion (421) of the second transmission arm (42). A first convex portion and a first concave portion are spaced apart from each other and disposed on the side wall of the first sliding groove (322). The first convex portion includes a second elastic component. The sliding end portion (411) of the first transmission arm (41) slides to a first position with respect to the first sliding groove (322), the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a first compression amount. The folding device according to claim 4, wherein the sliding end portion (411) of the first transmission arm (41) slides to a second position with respect to the first sliding groove (322), the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a second compression amount, and the first compression amount is greater than the second compression amount.

7. Applied to an electronic device having a flexible display, the flexible display includes a first non-bending portion (2001), a bending portion (2002), and a second non-bending portion (2003) arranged in sequence. The first housing (10) is fixedly connected to the first non-bending portion (2001), and the second housing (30) is fixedly connected to the second non-bending portion (2003). The rotating mechanism (20) further includes a first elastic body, and the first elastic body is disposed between the first rotating arm (51) and the first housing (10). The first elastic body is rotatably connected to the first rotating arm (51), and the first elastic body is fixedly connected to the first housing (10). The first elastic body includes the first fixing bracket (31). A first mechanical component (9113) abuts against the first end portion (511) of the first rotating arm (51), and the first mechanical component (9113) is a part of the first elastic body. An elastic force is generated by the amount of compression of the first elastic body in the first direction, and at least a part of the elastic force is transmitted to the bent portion (2002) through the first housing (10) and the first non-bent portion (2001). The first direction is orthogonal to the length extension direction of the main shaft (1), and the first direction is parallel to the first housing (10). When the folding device is in the flat state, a first portion of the first mechanical component (9113) abuts against a first portion of the first end portion (511) of the first rotating arm (51), and the amount of compression of the first elastic body in the first direction is a third amount of compression. The first housing (10) and the first elastic body rotate with respect to the main shaft (1), and the second housing (30) rotates with respect to the main shaft (1). The folding device changes from the flat state to the folded state. When the folding device is in the folded state, a second portion of the first mechanical component (9113) abuts against a second portion of the first end portion (511) of the first rotating arm (51), and the amount of compression of the first elastic body in the first direction is a fourth amount of compression, and the fourth amount of compression is smaller than the third amount of compression. The folding device according to claim 1, wherein the first portion of the first mechanical component (9113) is different from the second portion of the first mechanical component (9113), and / or the first portion of the first end portion (511) of the first rotating arm (51) is different from the second portion of the first end portion (511) of the first rotating arm (51).

8. The first end portion (511) of the first rotating arm (51) is rotatably connected to the first elastic body using a first rotating shaft (5112). When the folding device is in the flat state, the distance between the axis of the first rotating shaft (5112) and the first portion of the first end (511) of the first rotating arm (51) is a first distance, and the projected length of the first distance on the first plane is a first projected length. When the folding device is in the folded state, the distance between the axis of the first rotating shaft (5112) and the second portion of the first end (511) of the first rotating arm (51) is a second distance, and the projected length of the second distance on the first plane is a second projected length, and the second projected length is shorter than the first projected length. The folding device according to claim 7, wherein the first plane is a plane to which the first housing (10) and the first non-bending portion (2001) are fixedly connected.

9. The first elastic body is provided with a connection hole (3111). The fact that the first end (511) of the first rotating arm (51) is rotatably connected to the first elastic body using the first rotating shaft (5112) The folding device according to claim 7, including that the first rotating shaft (5112) passes through the connection hole (3111).

10. The connection hole (3111) includes a first side wall and a second side wall. The distance between the axis of the first rotating shaft (5112) and the first side wall is a first distance, the distance between the axis of the first rotating shaft (5112) and the second side wall is a second distance, and the first distance is shorter than the second distance. When the connection hole moves relative to the first rotating shaft (5112) in response to a first force acting on the first elastic body, the distance between the axis of the first rotating shaft (5112) and the first side wall is a third distance, the distance between the axis of the first rotating shaft (5112) and the second side wall is a fourth distance, and the third distance is longer than the fourth distance. The direction of the first force is a direction in which the second side wall faces the first side wall, the distance between the first side wall and the first housing (10) is a fifth distance, the distance between the second side wall and the first housing (10) is a sixth distance, and the fifth distance is shorter than the sixth distance. The folding device according to claim 9.

11. The rotating structure (20) further includes a second elastic body, The second elastic body is disposed between the second rotating arm (52) and the second housing (30). The second elastic body is rotatably connected to the second rotating arm (52), the second elastic body is fixedly connected to the second housing (30), and the second elastic body includes the second fixing bracket (32). A third mechanical component abuts against the first end (521) of the second rotating arm (52), and the third mechanical component is part of the second elastic body. An elastic force is generated by the amount of compression of the second elastic body in the second direction, and at least a part of the elastic force is transmitted to the bent portion (2002) through the second housing (30) and the second non-bent portion (2003). The second direction is perpendicular to the longitudinal extension direction of the main shaft, and the second direction is parallel to the second housing (30). When the folding device is in the flat state, the first part of the third mechanical component abuts against the first part of the first end (521) of the second rotating arm (52), and the amount of compression of the second elastic body in the second direction is the fifth amount of compression. When the folding device is in the folded state, the second part of the third mechanical component abuts against the second part of the first end (521) of the second rotating arm (52), and the amount of compression of the second elastic body in the second direction is the sixth amount of compression. The fifth amount of compression is smaller than the sixth amount of compression. The folding device according to any one of claims 7 to 10, wherein the first part of the third mechanical component is different from the second part of the third mechanical component, and / or the first part of the first end (521) of the second rotating arm (52) is different from the second part of the first end (521) of the second rotating arm (52).

12. The rotating mechanism (20) further includes a first support plate (21) and a second support plate (22). The first support plate (21) is fixedly connected to the sliding end (421) of the second transmission arm (42), and the second support plate (22) is fixedly connected to the sliding end (411) of the first transmission arm (41). When the folding device is in the flat state, the first support plate (21) is flush with the second support plate (22). The first support plate (21) is laid between the first fixed bracket (31) and the main shaft (1), and the second support plate (22) is laid between the second fixed bracket (32) and the main shaft (1). When the folding device is in the folded state, the first support plate (21) is related to the first fixed bracket (31) and is stacked on the side away from the second fixed bracket (32). The second support plate is related to the second fixed bracket (32) and is stacked on the side away from the first fixed bracket (31). The folding device according to any one of claims 1 to 10.

13. The main shaft (1) has a support surface (11). When the folding device is in the folded state, the support surface (11) of the main shaft (1) is exposed to the first support plate (21) and the second support plate (22). The support surface of the main shaft (1) is formed in an arc shape. The folding device according to claim 12.

14. The rotation mechanism (20) further includes a first shielding plate (23) and a second shielding plate (24). The first shielding plate (23) is fixedly connected to the sliding end (421) of the second transmission arm (42), and the second shielding plate (24) is fixedly connected to the sliding end (411) of the first transmission arm (41), or The first shielding plate (23) is fixedly connected to at least a part of the first support plate (21), and the second shielding plate (24) is fixedly connected to at least a part of the second support plate (22). The folding device according to any one of claims 1 to 10.

15. The main shaft (1) further includes a shielding plate (16). The inner shaft (15) is located between the outer shaft (14) and the shielding plate (16). The folding device according to any one of claims 1 to 10.

16. The rotation mechanism (20) further includes a synchronization component (70). The synchronization component (70) includes a first synchronization swing arm (71), a second synchronization swing arm (72), a first gear (731), and a second gear (732). The first gear (731) is disposed on the main shaft (1), the first gear (731) is rotatably connected to the main shaft (1), the second gear (732) is disposed on the main shaft (1), the second gear (732) is rotatably connected to the main shaft (1), and the first gear (731) engages with the second gear (732). The first synchronization swing arm (71) includes a sliding end portion (711) and a rotating end portion (712). The rotating end portion (712) of the first synchronization swing arm (71) is rotatably connected to the main shaft (1). The rotating end portion (712) of the first synchronization swing arm (71) engages with the first gear (731). The sliding end portion (711) of the first synchronization swing arm (71) is slidably connected to the first fixed bracket (31). The second synchronization swing arm (72) includes a sliding end portion (721) and a rotating end portion (722). The rotating end portion (722) of the second synchronization swing arm (72) is rotatably connected to the main shaft (1). The rotating end portion (722) of the second synchronization swing arm (72) engages with the second gear (732). The sliding end portion (721) of the second synchronization swing arm (722) is slidably connected to the second fixed bracket (32). The folding device according to any one of claims 1 to 10.

17. An electronic device including a first housing (10), a rotation mechanism (20), and a second housing (30) connected in sequence, wherein the rotation mechanism (20) is deformable so that the electronic device can be in a flat state or a folded state. The rotation mechanism (20) includes a main shaft (1), a first fixed bracket (31), a second fixed bracket (32), a first transmission arm (41), a first connection piece (61), a first rotation arm (51), a second transmission arm (42), a second connection piece (62), and a second rotation arm (52). At least a part of the first fixing bracket (31) is fixed to the first housing (10), and at least a part of the second fixing bracket (32) is fixed to the second housing (30). The first transmission arm (41) includes a sliding end portion (411) and a rotating end portion (412). The sliding end portion (411) of the first transmission arm (41) is slidably connected to the second fixing bracket (32). The rotating end portion (412) of the first transmission arm (41) is rotatably connected to the main shaft (1). The rotating end portion (412) of the first transmission arm (41) is rotatably connected to the first connecting piece (61). The first connecting piece (61) is rotatably connected to the second end portion (512) of the first rotating arm (51). The first end portion (511) of the first rotating arm (51) is rotatably connected to the first fixing bracket (31). The second transmission arm (42) includes a sliding end portion (421) and a rotating end portion (422). The sliding end portion (421) of the second transmission arm (42) is slidably connected to the first fixing bracket (31). The rotating end portion (422) of the second transmission arm (42) is rotatably connected to the main shaft (1). The rotating end portion (422) of the second transmission arm (42) is rotatably connected to the second connecting piece (62). The second connecting piece (62) is rotatably connected to the second end portion (522) of the second rotating arm (52). The first end portion (521) of the second rotating arm (52) is rotatably connected to the second fixing bracket (32). An electronic device.

18. The main shaft (1) includes an outer shaft (14) and an inner shaft (15), and the outer shaft (14) is fixedly connected to the inner shaft (15). The inner shaft (15) includes a first arc-shaped protrusion (153a) and a second arc-shaped protrusion. The outer shaft (14) includes a first arc-shaped groove (142a) and a second arc-shaped groove. The rotating end portion (412) of the first transmission arm (41) is arc-shaped and is rotatably connected to the first arc-shaped protrusion (153a) and the first arc-shaped groove (142a). The rotating end portion (422) of the second transmission arm (42) is arc-shaped and is rotatably connected to the second arc-shaped protrusion and the second arc-shaped groove. The electronic device according to claim 17.

19. The first rotating arm (51) is connected to the first connection piece (61) via a second rotating shaft (6121). The outer shaft (14) and the inner shaft (15) are surrounded to form an arc-shaped groove (156). The second rotating shaft (6121) cooperates with the arc-shaped groove (156) in a sliding manner. The electronic device according to claim 18.

20. The second fixing bracket (32) includes a first sliding groove (322). The first fixing bracket (31) includes a second sliding groove (312). The fact that the sliding end portion (411) of the first transmission arm (41) is slidably connected to the second fixing bracket (32) The sliding end portion (411) of the first transmission arm (41) is slidably connected to the first sliding groove (322), and In the process of the electronic device switching from the flat state to the folded state, the sliding end portion (411) of the first transmission arm (41) slides with respect to the first sliding groove (322), including The fact that the sliding end portion (421) of the second transmission arm (42) is slidably connected to the first fixing bracket (31) The sliding end portion (421) of the second transmission arm (42) is slidably connected to the second sliding groove (312), and In the process of the electronic device switching from the flat state to the folded state, the sliding end portion (421) of the second transmission arm (42) slides with respect to the second sliding groove (312), including. The electronic device according to claim 17.

21. The first transmission arm (41) further includes a first limiting component (81). The first limiting component (81) is arranged at the sliding end portion (411) of the first transmission arm (41). The first convex portion and the first concave portion are arranged on the side wall of the first sliding groove (322) so as to be spaced apart from each other. The first limiting component (81) includes a second elastic component. The sliding end portion (411) of the first transmission arm (41) slides to a first position with respect to the first sliding groove (322), the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a first compression amount. The sliding end portion (411) of the first transmission arm (41) slides to a second position with respect to the first sliding groove (322), the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a second compression amount, and the first compression amount is greater than the second compression amount. The electronic device according to claim 20.

22. The first transmission arm (41) further includes a first limiting component (81), and the first limiting component (81) is arranged at the sliding end portion (411) of the first transmission arm (41). The second limiting component (82) is arranged at the sliding end portion (421) of the second transmission arm (42). The first convex portion and the first concave portion are arranged on the side wall of the first sliding groove (322) so as to be spaced apart from each other. The first convex portion includes a second elastic component. The sliding end portion (411) of the first transmission arm (41) slides to a first position with respect to the first sliding groove (322), the first limiting component cooperates with the first convex portion, and the compression amount of the second elastic component is a first compression amount. The sliding end portion (411) of the first transmission arm (41) slides to a second position with respect to the first sliding groove (322), the first limiting component cooperates with the first concave portion, and the compression amount of the second elastic component is a second compression amount, and the first compression amount is greater than the second compression amount. The electronic device according to claim 20.

23. The electronic device further includes a flexible display (200). The flexible display includes a first non-bending portion (2001), a bending portion (2002), and a second non-bending portion (2003) arranged in sequence. The first housing (10) is fixedly connected to the first non-bending portion (2001), and the second housing (30) is fixedly connected to the second non-bending portion (2003). The rotating mechanism (20) further includes a first elastic body, and the first elastic body is disposed between the first rotating arm (51) and the first housing (10). The first elastic body is rotatably connected to the first rotating arm (51), and the first elastic body is fixedly connected to the first housing (10). The first elastic body includes a first fixing bracket (31). A first mechanical component (9113) abuts against the first end (511) of the first rotating arm (51), and the first mechanical component (9113) is a part of the first elastic body. Elastic force is generated by the amount of compression of the first elastic body in a first direction, and at least a part of the elastic force is transmitted to the bent portion (2002) through the first housing (10) and the first non-bent portion (2001). The first direction is orthogonal to the length extension direction of the main shaft (1), and the first direction is parallel to the first housing (10). When the electronic device is in the flat state, a first portion of the first mechanical component (9113) abuts against a first portion of the first end (511) of the first rotating arm (51), and the amount of compression of the first elastic body in the first direction is a third amount of compression. The first housing (10) and the first elastic body rotate with respect to the main shaft (1), and the second housing (30) rotates with respect to the main shaft (1). The electronic device changes from the flat state to the folded state. When the electronic device is in the folded state, a second portion of the first mechanical component (9113) abuts against a second portion of the first end (511) of the first rotating arm (51), and the amount of compression of the first elastic body in the first direction is a fourth amount of compression, and the fourth amount of compression is smaller than the third amount of compression. The electronic device according to claim 17, wherein the first portion of the first mechanical component (9113) is different from the second portion of the first mechanical component (9113), and / or the first portion of the first end (511) of the first rotating arm (51) is different from the second portion of the first end (511) of the first rotating arm (51).

24. The first end (511) of the first rotating arm (51) is rotatably connected to the first elastic body using a first rotating shaft (5112). When the electronic device is in the flat state, the distance between the axis of the first rotating shaft (5112) and the first portion of the first end (511) of the first rotating arm (51) is a first distance, and the projection length of the first distance on a first plane is a first projected length. When the electronic device is in the folded state, the distance between the axis of the first rotating shaft (5112) and the second portion of the first end (511) of the first rotating arm (51) is a second distance, and the projection length of the second distance on the first plane is a second projected length, and the second projected length is shorter than the first projected length. The electronic device according to claim 23, wherein the first plane is a plane to which the first housing (10) and the first non-bending portion (2001) are fixedly connected.

25. The first elastic body is provided with a connection hole (3111). The fact that the first end (511) of the first rotating arm (51) is rotatably connected to the first elastic body using the first rotating shaft (5112) includes the first rotating shaft (5112) passing through the connection hole (3111). The electronic device according to claim 23.

26. The connection hole (3111) includes a first side wall and a second side wall. The distance between the axis of the first rotating shaft (5112) and the first side wall is a first distance, the distance between the axis of the first rotating shaft (5112) and the second side wall is a second distance, and the first distance is shorter than the second distance. When the connection hole moves with respect to the first rotating shaft (5112) in response to a first force acting on the first elastic body, the distance between the axis of the first rotating shaft (5112) and the first side wall is a third distance, the distance between the axis of the first rotating shaft (5112) and the second side wall is a fourth distance, and the third distance is greater than the fourth distance. The direction of the first force is a direction in which the second side wall faces the first side wall, the distance between the first side wall and the first housing (10) is a fifth distance, the distance between the second side wall and the first housing (10) is a sixth distance, and the fifth distance is shorter than the sixth distance. The electronic device according to claim 25.

27. The rotating structure (20) further includes a second elastic body. The second elastic body is disposed between the second rotating arm (52) and the second housing (30). The second elastic body is rotatably connected to the second rotating arm (52), and the second elastic body is fixedly connected to the second housing (30). The second elastic body includes the second fixing bracket (32). A third mechanical component abuts against the first end portion (521) of the second rotating arm (52), and the third mechanical component is a part of the second elastic body. Elastic force is generated by the amount of compression of the second elastic body in the second direction, and at least a part of the elastic force is transmitted to the bent portion (2002) through the second housing (30) and the second non-bent portion (2003). The second direction is orthogonal to the longitudinal extension direction of the main shaft, and the second direction is parallel to the second housing (30). When the electronic device is in the flat state, a first portion of the third mechanical component abuts against a first portion of the first end portion (521) of the second rotating arm (52), and the amount of compression of the second elastic body in the second direction is a fifth amount of compression. When the electronic device is in the folded state, a second portion of the third mechanical component abuts against a second portion of the first end portion (521) of the second rotating arm (52), and the amount of compression of the second elastic body in the second direction is a sixth amount of compression. The fifth amount of compression is smaller than the sixth amount of compression. The first portion of the third mechanical component is different from the second portion of the third mechanical component, and / or the first portion of the first end portion (521) of the second rotating arm (52) is different from the second portion of the first end portion (521) of the second rotating arm (52). The electronic device according to any one of claims 23 to 26. **Claim 28** The rotation mechanism (20) further includes a first support plate (21) and a second support plate (22). The first support plate (21) is fixedly connected to the sliding end portion (421) of the second transmission arm (42), and the second support plate (22) is fixedly connected to the sliding end portion (411) of the first transmission arm (41). When the electronic device is in the flat state, the first support plate (21) is flush with the second support plate (22), the first support plate (21) is laid between the first fixing bracket (31) and the main shaft (1), and the second support plate (22) is laid between the second fixing bracket (32) and the main shaft (1). When the electronic device is in the folded state, the first support plate (21) is related to the first fixing bracket (31) and is stacked on the side away from the second fixing bracket (32), and the second support plate (22) is related to the second fixing bracket (32) and is stacked on the side away from the first fixing bracket (31). The electronic device according to any one of claims 17 to 27.

29. The main shaft (1) has a support surface (11). When the electronic device is in the folded state, the support surface (11) of the main shaft (1) is exposed to the first support plate (21) and the second support plate (22), and the support surface of the main shaft (1) is arc-shaped. The electronic device according to claim 28.

30. The rotation mechanism (20) further includes a first shielding plate (23) and a second shielding plate (24). The first shielding plate (23) is fixedly connected to the sliding end portion (421) of the second transmission arm (42), and the second shielding plate (24) is fixedly connected to the sliding end portion (411) of the first transmission arm (41), or The first shielding plate (23) is fixedly connected to at least a part of the first support plate (21), and the second shielding plate (24) is fixedly connected to at least a part of the second support plate (22). The electronic device according to any one of claims 17 to 27.

31. The main shaft (1) further includes a shielding plate (16), and the inner shaft (15) is located between the outer shaft (14) and the shielding plate (16). The electronic device according to any one of claims 17 to 27.

32. The rotation mechanism (20) further includes a synchronization component (70). The synchronization component (70) includes a first synchronization swing arm (71), a second synchronization swing arm (72), a first gear (731), and a second gear (732). The first gear (731) is disposed on the main shaft (1), the first gear (731) is rotatably connected to the main shaft (1), the second gear (732) is disposed on the main shaft (1), the second gear (732) is rotatably connected to the main shaft (1), and the first gear (731) is engaged with the second gear (732). The first synchronization swing arm (71) includes a sliding end portion (711) and a rotating end portion (712). The rotating end portion (712) of the first synchronization swing arm (71) is rotatably connected to the main shaft (1), the rotating end portion (712) of the first synchronization swing arm (71) is engaged with the first gear (731), and the sliding end portion (711) of the first synchronization swing arm (71) is slidably connected to the first fixed bracket (31). The second synchronization swing arm (72) includes a sliding end portion (721) and a rotating end portion (722). The rotating end portion (722) of the second synchronization swing arm (72) is rotatably connected to the main shaft (1), the rotating end portion (722) of the second synchronization swing arm (72) is engaged with the second gear (732), and the sliding end portion (721) of the second synchronization swing arm (722) is slidably connected to the second fixed bracket (32). The electronic device according to any one of claims 17 to 27.

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