Hinge Structure of a Foldable Display Device with an Extremely High Screen-to-Body Ratio and a Foldable Display Device

Abstract

The present invention discloses a hinge structure and a folding display device for a folding display device with an extremely high screen-to-body ratio, belonging to the technical field of flexible display devices. The hinge structure includes a hinge shaft, and further includes panel frames symmetrically arranged on both sides of the hinge shaft. The panel frames are assembled on the hinge shaft through folding components, and the two panel frames are driven by the folding components to perform opening and closing movements relative to the hinge shaft. Sliding components are provided on the side edges of each panel frame facing the two ends of the hinge shaft. The hinge structure further includes a flexible board installed on the hinge shaft. The flexible board is connected to each panel frame through the sliding components, and the flexible board performs a linkage movement under the opening and closing movements of the panel frames, so as to optimize the hinge structure and increase the available space of the screen, and finally achieve the purpose of an extremely high screen-to-body ratio.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible display devices. Specifically, it relates to a hinge structure and a folding display device for a folding display device with an extremely high screen-to-body ratio. Background Art

[0002] Flexible display devices have advantages such as impact resistance, light weight, and convenient portability. They have functions and user experience advantages that traditional displays cannot achieve. Therefore, flexible display technology has received increasing attention, and the protective cover is an indispensable component in flexible display devices.

[0003] In the era of the rapid development of smartphones, in order to meet the needs of the current smartphone market, products with high screen-to-body ratios have been successively launched. The screen-to-body ratio of folding mobile phones in the current market is about 86%. For example, the screen-to-body ratio of Samsung Galxy Fold is 85.79%, and the screen-to-body ratio of Huawei Mate X is 86.86%.

[0004] In the prior art, in order to achieve product differentiation, smartphone manufacturers achieve differentiation through designs that increase the screen-to-body ratio. However, due to the space occupied by the hinge part and the joint part, the improvement of the screen-to-body ratio is restricted.

[0005] In view of the above problems, it is urgent to optimize the existing hinge structure of folding mobile phones to meet the requirements of folding mobile phones with an extremely high screen-to-body ratio, thereby achieving product differentiation. Summary of the Invention

[0006] In view of this, in order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a hinge structure and a folding display device for a folding display device with an extremely high screen-to-body ratio, so as to achieve the purpose of an extremely high screen-to-body ratio by optimizing the hinge structure and increasing the available space of the screen.

[0007] The technical solution adopted by the present invention is as follows: A hinge structure for a folding display device with an extremely high screen-to-body ratio includes a hinge shaft, and further includes panel frames symmetrically arranged on both sides of the hinge shaft. The panel frames are assembled on the hinge shaft through a folding assembly, and the two panel frames are driven by the folding assembly to make opening and closing movements relative to the hinge shaft. Sliding components are provided on the side edges of each panel frame facing the two ends of the hinge shaft; A flexible board is also installed on the hinge shaft. The flexible board is connected to each panel frame through the sliding component, and the flexible board makes a linkage movement under the opening and closing movement of the panel frame.

[0008] Further, the folding assembly includes a connecting arm and a rotating shaft provided on the connecting arm. The rotating shaft is rotatably arranged on the hinge shaft, and the connecting arm is connected to the panel frame to enable the two panel frames to make opening and closing movements.

[0009] Further, a first cam that rotates synchronously with the rotating shaft is provided on the rotating shaft; a second cam that is slidably disposed within the hinge shaft is further included. The second cam is provided with an elastic member that drives it to contact and engage with the first cam, so that when the connecting arm rotates, under the cooperation of the elastic member and the cam structure, it can stop at any opening and closing angle to meet the diverse needs of users.

[0010] Further, a reference line is set along the length direction of the hinge shaft, and the folding assemblies are symmetrically arranged on both sides of the reference line, so as to make the two panel frames move more coordinately and smoothly.

[0011] Further, gears are provided on the first cams of the two symmetric folding assemblies, and the two gears are in meshing transmission. When the gears mesh and rotate, the panel frames on both sides can perform synchronous opening and closing movements.

[0012] Further, the hinge shaft includes a hinge housing and a hinge cover. A rotating space is formed between the hinge housing and the hinge cover. The folding assembly is installed through the rotating space, and a rotating hole corresponding to and matching the connecting arm is provided in the rotating space. On the one hand, it can achieve quick installation of the folding assembly, and on the other hand, it can meet the functional realization of the folding assembly.

[0013] Further, the cross-section of the hinge housing is in the shape of a flat circular tube, and the flexible plate is connected to the hinge housing through a plurality of countersunk bolts. Under the action of the flexible plate, good transition can be achieved at the hinge of the two panel frames, and the flat circular tube shape is beneficial to avoid creases or damage to the flexible screen assembly at the hinge.

[0014] Further, the sliding assembly includes a slide rail provided on the side edge of the panel frame and a first slider that matches the slide rail. The side edge of the flexible plate is mounted on the first slider, so as to be able to move the side edge of the flexible plate and the flexible screen assembly towards the outside, thereby reducing the distance between the flexible screen assembly and the end of the hinge shaft.

[0015] Further, a reset mechanism for driving the flexible plate to move back to its original position is provided on the panel frame, and a real-time acting force is provided to the flexible plate under the action of the reset mechanism; the reset mechanism includes a second slider that is slidably disposed on the panel frame. The second slider is connected to the flexible plate, and the second slider is connected with a reset spring that drives it to reset.

[0016] The present invention also discloses a folding display device, which includes the hinge structure of the extremely high screen ratio folding display device described above, and further includes a support plate. The support plate is fixedly connected to the panel frame, and the flexible plate is flush with the plane where the support plate is located; a notch matching the hinge shaft is provided at the end of the support plate, and a flexible screen assembly is further included. The support plate and the flexible plate form a bearing surface for the flexible screen assembly.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By adopting the hinge structure of the extremely high screen - to - body ratio folding display device and the folding display device disclosed in the present invention, the panel frame can perform opening and closing movements relative to the hinge axis through the folding assembly. At the same time, the side of the flexible board is connected to the panel frame through the sliding assembly, so as to drive the flexible board to move when the panel frame makes opening and closing movements. The folding assembly can be arranged inside the fuselage to minimize the distance between the flexible screen assembly and the end of the hinge axis to the greatest extent, thereby achieving an extremely high screen - to - body ratio of the folding display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0020] Figure 2 is Figure 1 partial enlarged schematic diagram of;

[0021] Figure 3 is the partial structural schematic diagram of the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention when unfolded;

[0022] Figure 4 is the structural schematic diagram of the folding assembly in the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0023] Figure 5 is the structural schematic diagram of the flexible board in the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0024] Figure 6 is the assembly structural schematic diagram of the folding assembly in the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0025] Figure 7 is the structural schematic diagram of the hinge axis in the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0026] Figure 8 is Figure 6 partial structural schematic diagram of;

[0027] Figure 9 is the installation structural schematic diagram of the flexible board in the hinge structure of the extremely high screen - to - body ratio folding display device provided by the present invention;

[0028] Figure 10 is the partial structural schematic diagram of the hinge structure of the extremely high screen - to - body ratio folding display device in Embodiment 2 provided by the present invention;

[0029] Figure 11It is a schematic structural diagram of the folding component in the hinge structure of the extremely high screen-to-body ratio folding display device provided by the present invention in Embodiment 2;

[0030] Figure 12 It is a schematic structural diagram of the first cam in the hinge structure of the extremely high screen-to-body ratio folding display device provided by the present invention in Embodiment 2;

[0031] Figure 13 It is a schematic overall structural diagram of the folding display device provided by the present invention in the closed state;

[0032] Figure 14 It is Figure 10 a partial structural diagram of;

[0033] Figure 15 It is a schematic structural diagram of the support plate in the folding display device provided by the present invention;

[0034] Figure 16 It is a schematic overall structural diagram of the folding display device provided by the present invention in the unfolded state;

[0035] The labels in the drawings are as follows:

[0036] 1 - hinge shaft, 2 - flexible plate, 3 - panel frame, 4 - reset mechanism, 5 - folding component, 6 - sliding component, 7 - first slider, 8 - slide rail, 9 - connecting arm, 10 - second slider, 11 - rotating shaft, 12 - bushing, 13 - bending part, 14 - hinge cover, 15 - hinge housing, 16 - support plate, 17 - fixed seat, 18 - tension spring, 19 - chute, 20 - flexible screen assembly; 21 - bushing, 22 - first cam, 23 - second cam, 24 - spring, 25 - baffle, 26 - second convex tooth, 27 - first convex tooth. Detailed Description of the Invention

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0040] It should be noted that like reference numerals and letters indicate like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the present invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Embodiment 1

[0044] As Figure 1 shown, in this embodiment, a hinge structure of an extremely high screen-to-body ratio folding display device is specifically provided. Compared with the traditional hinge structure, this hinge structure optimizes the space utilization during the opening and closing process, can minimize the distance between the flexible screen assembly and the end of the hinge shaft 1 to the greatest extent, and thus realizes the extremely high screen-to-body ratio of the folding display device and the differentiation of the product. It includes a hinge shaft 1. The hinge shaft 1 serves as the rotation reference of the entire hinge structure. In this embodiment, the cross-section of the hinge shaft 1 is in the shape of a flat circular tube, and other shapes can also be adopted, such as a circular column or a rectangular column, etc., which are not limited here. Preferably, the hinge shaft 1 includes a hinge housing 15 and a hinge cover 14. A rotation space is formed between the hinge housing 15 and the hinge cover 14 to install the folding assembly 5 and meet the movement requirements of the folding assembly 5.

[0045] It further includes panel frames 3 symmetrically arranged on both sides of the hinge shaft 1. The panel frames 3 are assembled on the hinge shaft 1 through folding assemblies 5, and the folding assemblies 5 drive the two panel frames 3 to move relative to the hinge shaft 1 for opening and closing. By restricting the movement of the panel frames 3 through the folding assemblies 5, when in the fully open state, the two panel frames 3 are in a horizontal state; when in the fully closed state, the two panel frames 3 are in a parallel folding state.

[0046] Such as Figure 1 , Figure 6 shown, to achieve the smooth operation of the two panel frames 3 during the opening and closing movement, the folding assemblies 5 are symmetrically arranged on the hinge shaft 1; preferably, a total of four folding assemblies 5 are provided, two folding assemblies 5 are connected to each panel frame 3, and the folding assemblies 5 on the two panel frames 3 are symmetrically arranged with each other.

[0047] To achieve the normal operation of the folding assembly 5, as Figure 4 shown, the following design is adopted: The folding assembly 5 includes a connecting arm 9 and a rotating shaft 11 provided on the connecting arm 9. A rotating hole matching the connecting arm 9 is opened in the hinge housing 15. Since one end of the connecting arm 9 is fixedly connected to the panel frame 3, when the panel frame 3 makes an opening and closing movement, the connecting arm 9 can freely rotate in the rotating hole. At the same time, as Figure 8 shown, the rotating shaft 11 is assembled at the other end of the connecting arm 9, and a bushing 12 matching it is movably sleeved outside the rotating shaft 11, and the bushing 12 is assembled in the above-mentioned rotating space. To prevent axial displacement during the rotational movement of the rotating shaft 11, a baffle can be sleeved at the end of the rotating shaft 11, and the baffle is movably assembled in the rotating space. The above is the preferred folding assembly 5 in this embodiment. Of course, other structures of the folding assembly 5 can also be adopted. For example, the connecting arm 9 is directly connected to the hinge shaft through a bearing and rotational limit is carried out. The forms and structures of the folding assembly 5 are diverse and will not be elaborated here one by one.

[0048] Such as Figure 9 shown, it further includes a flexible plate 2 installed on the hinge shaft 1. The flexible plate 2 is connected to the hinge shaft 1 through a plurality of countersunk bolts to avoid interference of the countersunk bolts with the flexible screen assembly carried on the flexible plate 2.

[0049] Such as Figure 1As shown in the figure, sliding components 6 are provided on the side edges of each panel frame 3 facing both ends of the hinge axis 1. That is, the folding component 5 on the panel frame 3 is arranged between the two sliding components 6 assembled on the panel frame 3. The flexible plate 2 is connected to each panel frame 3 through the sliding components 6, and the flexible plate 2 makes a linkage movement under the opening and closing movement of the panel frame 3, so as to realize that when the two panel frames 3 are switched from being fully opened to being fully closed, or from being fully closed to being fully opened, under the action of the sliding components 6, the flexible plate 2 can also be unfolded into a flat state or bent into a U-shaped state to meet the use requirements of this hinge structure.

[0050] As Figure 2 , Figure 3 shown in the figure, the sliding component 6 includes a slide rail 8 provided on the side edge of the panel frame 3 and a first slider 7 matching the slide rail 8. A chute 19 is formed on the side wall of the first slider 7 and is assembled on the slide rail 8 through the chute 19. The side edge of the flexible plate 2 is mounted on the first slider 7. Since the flexible plate 2 plays a supporting role for the flexible screen assembly in the hinge structure, the connection between the flexible plate 2 and the first slider 7 mostly adopts an adhesive connection. In the embodiment, as Figure 5 shown in the figure, in order to further improve the movement stability of this hinge structure, a bending part 13 is adopted on the side edge of the flexible plate 2, and the flexible plate 2 is connected and fixed to the first slider 7 through the bending part 13. After the bending part 13 is connected to the first slider 7, compared with directly connecting to the first slider 7, the connection stability between the first slider 7 and the bending part 13 can be improved, and looseness is not likely to occur. The above structure is adopted to connect the flexible plate 2 and the first slider 7. In addition, the first slider 7 is slidably arranged on the side edge of the panel frame 3, so that the side edge of the flexible plate 2 can be moved outwards to the maximum extent (i.e., towards the end side of the hinge axis 1). Then, after the flexible screen assembly is carried on the flexible plate 2, under the requirement of meeting the structural strength, the width dimension of the border of the folding display device can be reduced to the maximum extent; at the same time, for the design of the flexible plate 2, the side edge of the flexible plate 2 can be made flush with the side edge of the first slider 7 to reduce the width dimension of the border of the folding display device to the maximum extent.

[0051] In this embodiment, it is preferably to design the sliding component 6 in the above manner. In the actual application process, the first slider 7 can also be slidably arranged on the panel frame 3 in other ways. For example, the direct sliding method using a sliding hole can be adopted, etc., which will not be elaborated here one by one.

[0052] As Figure 11As shown, since it is necessary to ensure that the flexible plate 2 can be smoothly unfolded or bent during the opening and closing movement of the hinge structure, a reset mechanism 4 for driving the movement and reset of the flexible plate 2 is provided on the panel frame 3. The reset mechanism 4 includes a second slider 10 slidably disposed on the panel frame 3. A sliding hole matching the second slider 10 is provided on the panel frame 3. The second slider 10 is connected to the flexible plate 2 and the second slider 10 is connected with a reset spring for driving its reset. The reset spring is set as a tension spring 18 and the other end of the tension spring 18 is connected to the panel frame 3 through a fixed seat 17. In this embodiment, two second sliders 10 are provided and the two second sliders 10 are symmetrically arranged relative to the middle of the hinge shaft 1. Two tension springs 18 are connected to each second slider 10. During the opening and closing movement of the two panel frames 3, under the action of the tension spring 18, the flexible plate 2 is always in a stressed state through the second slider 10. Under the action of the first slider 7, a relative movement is generated between the flexible plate 2 and the panel frame 3, so that the flexible plate 2 always adheres to the surfaces of the two panel frames 3 and the hinge shaft 1, thereby providing good support for the flexible screen assembly.

[0053] Embodiment 2

[0054] On the basis of Embodiment 1, in order to further improve the differentiation and competitiveness of the product, so as to be able to open and close and stop at certain specific angles during the folding process to meet the diverse needs of users, such as Figure 10 , Figure 11 , Figure 12 As shown, the specific design is as follows:

[0055] A first cam 22 synchronously rotating with the rotating shaft is provided on the rotating shaft. The first cam 22 is sleeved on the rotating shaft and a rotational limiting structure is provided between the two to ensure that the first cam 22 can move synchronously with the rotating shaft. It also includes a second cam 23 slidably disposed on the hinge shaft. The second cam 23 slides along the axis direction of the rotating shaft and the rotating shaft can rotate relative to the second cam 23. The second cam 23 is provided with an elastic member for driving it to contact and engage with the first cam 22. Under the action of the elastic member, it is ensured that the second convex teeth 26 on the second cam 23 and the first convex teeth 27 on the first cam 22 are always in a meshing state with each other.

[0056] In order to provide sufficient force for the second cam 23 and ensure the reasonable application of the internal space of the hinge shaft, the elastic member is set as a spring 24 sleeved on the rotating shaft. The end of the spring 24 abuts against the second cam 23. A baffle 25 is assembled at the end of the rotating shaft, and the baffle 25 abuts tightly against the spring 24.

[0057] Such as Figure 10 , Figure 11 As shown, the working principle of realizing opening and closing at any angle is as follows:

[0058] In this embodiment, two symmetric first convex teeth 27 are provided on the first cam 22, and two symmetric second convex teeth 26 are also provided on the second cam 23. When the first cam 22 rotates relative to the second cam 23, the second cam 23 will be pressed to retract. As the first cam 22 continues to rotate, the second convex teeth 26 on the second cam 23 and the first convex teeth 27 on the first cam 22 will switch to another meshing state, and the second cam 23 will reset under the action of the elastic member. At this time, the connecting arm rotates to another angular position relative to the initial position and remains in the current position, so as to realize that the connecting arms of the two symmetric folding assemblies can be opened and stopped at the 0° and 90° positions; similarly, by designing different numbers of convex teeth on the first cam 22 and the second cam 23 and arranging the convex teeth at different angles, the opening and closing can be stopped at more opening and closing angle positions to meet the diverse needs of users.

[0059] To ensure that the connecting arm rotates smoothly and can make reasonable use of the internal space of the hinge shaft, it further includes a bushing 21 installed in the hinge shaft. The bushing 21 is sleeved on the two connecting arms in each pair of folding assemblies to make the connecting arm rotate more smoothly.

[0060] To enable the folding display device applying this hinge structure to open and close symmetrically, gears are provided on the first cams 22 of the two symmetric folding assemblies in the pair of folding assemblies, and the two gears are in meshing transmission. When any one connecting arm rotates, the rotating shaft corresponding to the connecting arm rotates, and the rotating shaft will synchronously drive the other rotating shaft to rotate through the gear, thereby realizing the synchronous symmetric opening and closing of the other connecting arm. In this embodiment, the gear and the first cam 22 are integrally processed, that is, a first convex tooth 27 is provided at the end of the first cam 22 and a meshing tooth is provided on the side wall of the first cam 22.

[0061] To make reasonable use of the internal space of the hinge shaft, the second cam 23 is sleeved on the rotating shafts of the two symmetric folding assemblies, and second convex teeth 26 corresponding to the two first cams 22 are provided on the second cam 23. In this embodiment, the second cam 23 is also integrally processed, and a second convex tooth 26 is provided at the end of the second cam 23.

[0062] Embodiment 3

[0063] As Figure 13 、 Figure 14 shown, on the basis of Embodiment 1 or Embodiment 2, in this embodiment, a folding display device is further disclosed to achieve an extremely high screen-to-body ratio of the folding display device. The specific design is as follows:

[0064] The folding display device includes the hinge structure of the extremely high screen-to-body ratio folding display device described above, and further includes a support plate 16 and a flexible screen assembly 20. The support plate 16 is respectively connected to the two panel frames 3, and the flexible plate 2 is flush with the plane where the support plate 16 is located. An installation groove is formed in the support plate 16. The surface frame plate is connected in the installation groove by bolts, and a chute 19 matching the first sliders 7 on both sides of the panel groove is further provided in the installation groove; a notch matching the hinge shaft 1 is provided at the end of the support plate 16, and the cross-section of the notch is arc-shaped. When the two panel frames 3 are in the open or closed state, the notch matches the side of the hinge shaft 1.

[0065] As Figure 15 , Figure 16 shown, the panel frame 3 is fixedly assembled in the installation groove, and a flexible plate 2 is provided on the other surface of the panel frame 3. The surface of the flexible plate 2 is flush with the surface of the support plate 16, so as to form a bearing surface for the flexible screen assembly 20 (not shown in the drawings) through the support plate 16 and the flexible plate 2, and provide sufficient support force for the flexible screen assembly 20 on the bearing surface to meet the folding function requirements of the folding display device.

[0066] The present invention is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they are all within the protection scope of the present invention.

Claims

1. A hinge structure for a foldable display device with an extremely high screen-to-body ratio, including a hinge shaft, characterized in that, It further includes panel frames symmetrically arranged on both sides of the hinge axis. The panel frames are assembled on the hinge axis through folding components and driven by the folding components to make opening and closing movements relative to the hinge axis. Sliding components are provided on the side edges of each panel frame facing the two ends of the hinge axis; it further includes a flexible plate installed on the hinge axis. The flexible plate is connected to each panel frame through the sliding components and makes a linkage movement under the opening and closing movement of the panel frame; the flexible plate plays a supporting role for the flexible screen assembly in the hinge structure. The sliding component includes a slide rail provided on the side edge of the panel frame and a first slider matching the slide rail. The side edge of the flexible plate is installed on the first slider. A reset mechanism for driving the flexible plate to move and reset is provided on the panel frame. The reset mechanism includes a second slider slidably arranged on the panel frame. The second slider is connected to the flexible plate and the second slider is connected with a reset spring for driving its reset.

2. The hinge structure of the extremely high screen-to-body ratio foldable display device according to claim 1, characterized in that, The folding component includes a connecting arm and a rotating shaft provided on the connecting arm. The rotating shaft is rotatably arranged on the hinge axis, and the connecting arm is connected to the panel frame.

3. The hinge structure of the extremely high screen-to-body ratio folding display device according to claim 2, characterized in that, A first cam synchronously rotating with the rotating shaft is provided on the rotating shaft; it further includes a second cam slidably arranged in the hinge axis. The second cam is provided with an elastic member for driving it to contact and engage with the first cam.

4. The hinge structure of the extremely high screen-to-body ratio foldable display device according to claim 3, characterized in that, A reference line is set along the length direction of the hinge axis, and the folding components are symmetrically arranged on both sides of the reference line.

5. The hinge structure of the extremely high screen-to-body ratio folding display device according to claim 4, characterized in that, Gears are provided on the first cams of the two symmetrical folding components and are meshed and driven with each other.

6. The hinge structure of the extremely high screen-to-body ratio foldable display device according to claim 2, wherein The hinge axis includes a hinge housing and a hinge cover. A rotating space is formed between the hinge housing and the hinge cover. The folding component is installed through the rotating space and the rotating space is provided with a rotating hole corresponding to and matching the connecting arm.

7. The hinge structure of the extremely high screen-to-body ratio foldable display device according to claim 6, characterized in that, The cross section of the hinge housing is in the shape of a flat circular tube, and the flexible plate is connected to the hinge housing through a plurality of countersunk bolts.

8. A foldable display device, characterized in that, This folding display device includes the hinge structure of the extremely high screen-to-body ratio folding display device according to any one of claims 1-7. It further includes a support plate. The support plate is fixedly connected to the panel frame and the flexible plate is flush with the plane where the support plate is located; a notch matching the hinge axis is provided at the end of the support plate. It further includes a flexible screen assembly, and a bearing surface of the flexible screen assembly is formed by the support plate and the flexible plate.

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