Hinge device and folding display device

Abstract

The application discloses a hinge device and a folding display device. The hinge device comprises a base having a first surface and first and second arc surfaces opposite to the first surface, the radius of the first arc surface is greater than that of the second arc surface; a first rotating arm rotatably connected with the base, the rotating axis of the first rotating arm coincides with the axis of the first arc surface; and a second rotating arm rotatably connected with the base, the rotating axis of the second rotating arm coincides with the axis of the second arc surface. Through the asymmetric structure of the base, the first and second display ends of the folding display device can rotate around the axes of the first and second arc surfaces respectively, the asymmetric folding of the first and second display ends is realized, the second display end does not need to increase the thickness to match the first display end, the folding display device maintains a relatively thin thickness, and the portability of the folding display device is maintained under the premise of increasing the display end.

Description

Technical Field

[0001] This application belongs to the field of foldable display device technology, and particularly relates to a hinge device and a foldable display device. Background Technology

[0002] A foldable display device is a display device with a folding function. In related technologies, the casing of a foldable display device adopts a symmetrical design, meaning the left and right casings are of the same thickness. Compared to relatively small foldable display devices such as foldable phones, such as... Figure 1 As shown, foldable display devices with larger dimensions, such as laptops, require higher power consumption and generate more heat due to their relatively large overall size. They need to be equipped with fans, heat dissipation modules, and other devices to assist in heat dissipation. Since batteries, fans, and heat dissipation modules all occupy a significant amount of thickness space, the system end of the foldable display device needs to meet certain thickness requirements. If symmetrical hinges are still used to fold and unfold the flexible screen, the thickness of the display end will inevitably need to be increased to the same level as the system end, resulting in an increase in the overall thickness of the foldable display device and a decrease in its portability.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This application aims to at least partially solve the technical problem that the increased overall thickness of foldable display devices, due to the use of symmetrical hinge mechanisms, leads to reduced portability. To this end, this application provides a hinge mechanism and a foldable display device.

[0005] This application provides a hinge device comprising: a base having a first surface and a first arcuate surface and a second arcuate surface opposite to the first surface, the radius of the first arcuate surface being greater than the radius of the second arcuate surface; a first rotating arm rotatably connected to the base, the axis of rotation of the first rotating arm coinciding with the axis of the first arcuate surface; and a second rotating arm rotatably connected to the base, the axis of rotation of the second rotating arm coinciding with the axis of the second arcuate surface.

[0006] In some embodiments, the axis of the first arcuate surface is spaced apart from the axis of the second arcuate surface by a first distance.

[0007] In some embodiments, the base has a first arcuate groove concentric with the first arcuate surface, the first rotating arm has a first arcuate plate matching the first arcuate groove, the first arcuate plate is housed in the first arcuate groove and can rotate relative to the first arcuate groove; the base has a second arcuate groove concentric with the second arcuate surface, the second rotating arm has a second arcuate plate matching the second arcuate groove, the second arcuate plate is housed in the second arcuate groove and can rotate relative to the second arcuate groove.

[0008] In some embodiments, the hinge device further includes a co-movement component, which is drivenly connected to the first rotating arm and the second rotating arm respectively, for co-movement transmission between the first rotating arm and the second rotating arm.

[0009] In some embodiments, the co-moving component includes: a plurality of co-moving gears, which are sequentially meshed and connected, and the opposite sides of the plurality of co-moving gears respectively mesh with the first rotating arm and the second rotating arm.

[0010] In some embodiments, the hinge device further includes a torque assembly connected to the first rotating arm and the second rotating arm respectively, for the stop-start function of the first rotating arm and the second rotating arm.

[0011] In some embodiments, the torque assembly includes: a first synchronous rotating shaft disposed on the base and rotating synchronously with the first rotating arm; a second synchronous rotating shaft disposed parallel to the first synchronous rotating shaft on the base and rotating synchronously with the second rotating arm; a concave cam connecting rod simultaneously sleeved on the first and second synchronous rotating shafts; two concave cams respectively sleeved on the first and second synchronous rotating shafts, the concave cams contacting each other, and the contact end faces of the concave cams and the concave cam connecting rods having mutually cooperating arc-shaped protrusions and arc-shaped grooves; and two elastic elements respectively sleeved on the first and second synchronous rotating shafts, the elastic elements providing elastic pressure between the contact end faces of the concave cams and the concave cam connecting rods.

[0012] This application also proposes a foldable display device, comprising: a first display end; a second display end connected to the first display end and foldable relative to the first display end; a flexible screen disposed on the first display end and the second display end; and the aforementioned hinge device located between the first display end and the second display end, wherein a first rotating arm is connected to the first display end, a second rotating arm is connected to the second display end, and a first surface is correspondingly disposed with respect to the flexible screen; wherein the radius difference between the first arcuate surface and the second arcuate surface is equal to the thickness difference between the first display end and the second display end.

[0013] In some embodiments, the first display terminal includes a first middle frame and a first housing disposed on the first middle frame, the first rotating arm is connected to the first middle frame, and the first arcuate surface is in rotatable contact with the first housing; the second display terminal includes a second middle frame and a second housing disposed on the second middle frame, the second rotating arm is connected to the second middle frame, and the second arcuate surface is in rotatable contact with the second housing.

[0014] In some embodiments, the hinge device further includes a teardrop-shaped inclined plate, the rotating end of which is rotatably disposed on the first middle frame, and the swinging end of the teardrop-shaped inclined plate opposite to the rotating end is adjacent to the first arc-shaped surface.

[0015] In some embodiments, the foldable display device further includes a support foot disposed on the second housing and retractable relative to the second housing.

[0016] In some embodiments, the extension height of the support pad is the same as the thickness difference between the first display end and the second display end.

[0017] The embodiments of this application have at least the following beneficial effects:

[0018] The aforementioned hinge device, through the asymmetrical structure of the base, allows the first and second rotating arms to rotate around the axes of the first and second arc surfaces respectively after connecting the first and second rotating arms to the base. This means that the first and second display ends of the folding display device can rotate around the axes of the first and second arc surfaces respectively, achieving asymmetrical folding of the first and second display ends. As a result, the second display end does not need to be thickened to match the first display end, allowing the folding display device to maintain a relatively thin thickness and ensuring portability of the folding display device while increasing the number of display ends. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a foldable display device in the related technology is shown;

[0021] Figure 2 A top view of the hinge device in an embodiment of this application is shown;

[0022] Figure 3 It shows Figure 2 Bottom view of the central hinge mechanism;

[0023] Figure 4 It shows Figure 3 Cross-sectional view of the central hinge device;

[0024] Figure 5 It shows Figure 4 A sectional view of the hinge device along line AA;

[0025] Figure 6 It shows Figure 4 BB-direction sectional view of the central hinge device;

[0026] Figure 7 It shows Figure 4 CC-direction sectional view of the central hinge device;

[0027] Figure 8 A schematic diagram of the foldable display device in its folded state, as shown in an embodiment of this application, is illustrated.

[0028] Figure 9 It shows Figure 8 A schematic diagram of the structure of a foldable display device when unfolded to a certain angle;

[0029] Figure 10 It shows Figure 8 A schematic diagram showing the location of the hinge device in a folding display device;

[0030] Figure 11 It shows Figure 8 A partial view of the cross-section of a foldable display device when it is unfolded 180°;

[0031] Figure 12 It shows Figure 8 A partial view of the cross-section of a foldable display device when folded 120°;

[0032] Figure 13 It shows Figure 8 A partial view of the cross-section of a foldable display device when folded 90°.

[0033] Figure 14 It shows Figure 8 A partial view of the cross-section of a foldable display device after it has been folded.

[0034] Figure label:

[0035] 10. Laptop computer; 11. Display terminal; h11. Display terminal thickness; 12. System terminal; h12. System terminal thickness; 13. Symmetrical hinge; 100. Foldable display device; 110. First display terminal; h110. First display terminal thickness; 111. First middle frame; 112. First housing; 120. Second display terminal; h120. Second display terminal thickness; 121. Second middle frame; 122. Second housing; 130. Flexible screen; 140. Support foot; 1000. Hinge device; 1100. Base; 1110. First arc Surface; 1111, Axis of the first arc surface; 1120, Second arc surface; 1121, Axis of the second arc surface; 1130, First surface; 1200, First rotating arm; 1210, First arc plate; 1300, Second rotating arm; 1310, Second arc plate; 1400, Water droplet inclined plate; 1500, Synchronous motion assembly; 1600, Torque assembly; 1610, First synchronous rotating shaft; 1620, Second synchronous rotating shaft; 1630, Concave cam; 1640, Concave cam connecting rod; 1650, Elastic element; 1660, Nut. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] This application is described below with reference to the accompanying drawings and specific embodiments:

[0039] The first aspect of this application proposes a hinge device 1000, such as... Figures 2 to 14As shown, the hinge device 1000 proposed in this embodiment includes a base 1100, a first rotating arm 1200, and a second rotating arm 1300. The base 1100 has a first surface 1130 and a first arcuate surface 1110 and a second arcuate surface 1120 opposite to the first surface 1130. The radius of the first arcuate surface 1110 is larger than the radius of the second arcuate surface 1120. The first rotating arm 1200 is rotatably connected to the base 1100, and the axis of rotation of the first rotating arm 1200 coincides with the axis 1111 of the first arcuate surface. The second rotating arm 1300 is rotatably connected to the base 1100, and the axis of rotation of the second rotating arm 1300 coincides with the axis 1121 of the second arcuate surface.

[0040] like Figures 3 to 6 as well as Figure 10 As shown, the hinge device 1000 proposed in this application embodiment, through the asymmetrical structure of the base 1100, allows the first rotating arm 1200 to rotate around the axis 1111 of the first arc surface and the second rotating arm 1300 to rotate around the axis 1121 of the second arc surface after connecting the first rotating arm 1200 and the second rotating arm 1300 to the base 1100. In other words, the first display end 110 of the folding display device 100 can rotate around the first arc surface and the second display end 120 can rotate around the second arc surface, realizing the asymmetrical rotation and asymmetrical folding of the first display end 110 and the second display end 120. This allows the second display end 120 to maintain a relatively thin thickness without increasing its thickness to match the first display end 110, thus maintaining the portability of the folding display device 100 while adding a folding display screen to the traditional system.

[0041] In this field, foldable screens are mainly used in small display devices such as mobile phones, and in other applications... Figure 1 This is rarely used in relatively large display devices such as the laptop 10 shown. The main reason is that the traditional laptop 10 uses an asymmetrical design, such as... Figure 1 As shown, laptops are relatively large in size, require significant power consumption, and generate a lot of heat. Therefore, fans and cooling modules are needed to assist in heat dissipation. Since the battery, fan, and cooling module all occupy considerable space, the system component 12 of the laptop 10 needs to meet certain thickness requirements, making it relatively thick. Simultaneously, the display component 11, where the screen is located, needs to be relatively thin to achieve a slim and lightweight overall design. However, in related technologies, such as... Figure 1As shown, when flexible displays are provided on both the display end 11 and the system end 12, a symmetrical hinge 13 needs to be set between the display end 11 and the system end 12 to achieve the folding of the flexible displays on the display end 11 and the system end 12. However, since the symmetrical hinge 13 has a symmetrical structure, the display end 11 and the system end 12 need to have the same thickness. That is, the thickness of the display end 11 needs to be increased so that the thickness h11 of the display end of the laptop 10 is the same as the thickness h12 of the system end. This symmetrical hinge 13 will result in the overall thickness of the folded display laptop 10 being twice that of the system end thickness h12. Compared with the traditional laptop 10, it is thicker and its portability is reduced, thus limiting the application and development of foldable displays in relatively large display devices such as laptops 10.

[0042] Regarding the aforementioned problems with the relatively large foldable display device 100, such as Figures 3 to 6 as well as Figure 10 As shown, this application embodiment provides a hinge device 1000, which adopts an asymmetrical structure, having an asymmetrical first arcuate surface 1110 and a second arcuate surface 1120. The first arcuate surface 1110 and the second arcuate surface 1120 respectively correspond to the asymmetrical first display end 110 and second display end 120 of the foldable display device 100. Figures 3 to 6 as well as Figure 10 As shown, the base 1100 of the hinge device 1000 has a first surface 1130 and a first arcuate surface 1110 and a second arcuate surface 1120 opposite to the first surface 1130. The radius of the first arcuate surface 1110 is larger than the radius of the second arcuate surface 1120. The first surface 1130 is used to mount the flexible screen 130. The first arcuate surface 1110 and the second arcuate surface 1120 can be used as the rotating surfaces on which the first display end 110 and the second display end 120 are attached, respectively, so that the first display end 110 can rotate and fold around the first arcuate surface 1110, and the second display end 120 can rotate and fold around the second arcuate surface 1120. Since the radius of the first arcuate surface 1110 is larger than the radius of the second arcuate surface 1120, and referring to the reference... Figure 8 and Figure 9 This allows the first arc surface 1110 with a larger radius to match the relatively thick first display end 110, and the relatively thick first display end 110 to rotate relative to the first arc surface 1110. It also allows the second arc surface 1120 with a smaller radius to match the relatively thin second display end 120, and the relatively thin second display end 120 to rotate relative to the second arc surface 1120. This allows the second display end 120 to maintain a relatively thin size, making the overall size of the foldable display device 100 relatively thin and maintaining the portability of the foldable display device 100.

[0043] In some embodiments, the hinge device 1000 of this application can be used in a foldable display device 100, such as a flexible laptop computer. In these foldable display devices 100, such as... Figure 8 and Figure 9 As shown, the asymmetrical design of the whole machine can be realized. The thickness of the first display end h110 is relatively thick and can be used to place heat dissipation components, electrical components and other structures. The thickness of the second display end h120 is relatively thin, similar to the structure of a traditional laptop. The thickness of the second display end h120 is about half of the thickness of the first display end h110. The thickness of the whole machine can be reduced by about 25%, so that the foldable display device 100 can maintain the characteristics of being thin and light, and improve its portability.

[0044] In some embodiments, such as Figures 3 to 7 as well as Figure 10 As shown, where, Figure 5 yes Figure 4 A sectional view of the hinge device along line AA. Figure 6 It shows Figure 4 BB section view of the central hinge device. Figure 7 It shows Figure 4 A cross-sectional view of the hinge device along the CC direction. One end of the first rotating arm 1200 and one end of the second rotating arm 1300 are respectively hinged to the base 1100 and located on opposite sides of the base 1100. In other words, one end of the first rotating arm 1200 is hinged to the base 1100, and the entire first rotating arm 1200 is located on one side of the first arcuate surface 1110 of the base 1100, so that the first rotating arm 1200 rotates corresponding to the axis 1111 of the first arcuate surface. After the first rotating arm 1200 is connected to the first display end 110 of the folding display device 100, the first display end 110 can rotate around the axis 1111 of the first arcuate surface. One end of the second rotating arm 1300 is hinged to the base 1100, and the entire second rotating arm 1300 is located on one side of the second arcuate surface 1120 of the base 1100, so that the second rotating arm 1300 rotates corresponding to the axis 1121 of the second arcuate surface. After the second rotating arm 1300 is connected to the second display end 120 of the folding display device 100, the second display end 120 can rotate around the axis 1121 of the second arcuate surface. By rotating the first display end 110 around the axis 1111 of the first arc surface and the second display end 120 around the axis 1121 of the second arc surface, the folding display device 100 achieves folding of the first display end 110 and the second display end 120 through the hinge device 1000, and the flexible screen 130 set on the first display end 110 and the second display end 120 is folded with the corresponding part of the hinge device 1000.

[0045] It should be noted that in the hinge device 1000 of this application, the first arc surface 1110 is an arc surface formed by rotating around the axis 1111 of the first arc surface. For example, the first arc surface 1110 can be regarded as the side surface of a cylinder after it is cut from the central axis, and the axis 1111 of the first arc surface can be regarded as the central axis of the cylinder. Similarly, the second arc surface 1120 is an arc surface formed by rotating around the axis 1121 of the second arc surface. For example, the second arc surface 1120 can be regarded as the side surface of a cylinder after it is cut from the central axis, and the axis 1111 of the first arc surface can be regarded as the central axis of the cylinder. Meanwhile, the axis 1111 of the first arc-shaped surface and the axis 1121 of the second arc-shaped surface are parallel to each other. The first arc-shaped surface 1110 and the second arc-shaped surface 1120 are located side by side on the base 1100. The first rotating arm 1200 rotates about the axis 1111 of the first arc-shaped surface as a virtual rotation axis, and the second rotating arm 1300 rotates about the axis 1121 of the second arc-shaped surface as a virtual rotation axis, so that the first rotating arm 1200 and the second rotating arm 1300 rotate towards each other and away from each other on the base 1100. At the same time, the first display terminal 110 and the second display terminal 120 can rotate towards each other and away from each other.

[0046] In some embodiments, such as Figures 5 to 7 As shown, the base 1100 includes a first arcuate portion and a second arcuate portion connected to the first arcuate portion, such that a first arcuate surface 1110 is formed on one side of the first arcuate portion, a second arcuate surface 1120 is formed on one side of the second arcuate portion, and a first surface 1130 of the base 1100 is formed on the other side of the first and second arcuate portions. Optionally, the first arcuate portion can be a quarter-cylinder structure, and similarly, the second arcuate portion can be a quarter-cylinder structure. The first and second arcuate portions are directly connected together, or they can be indirectly connected together through a transition portion, thereby forming a base 1100 structure having a first surface 1130, a first arcuate surface 1110 opposite to the first surface 1130, and a second arcuate surface 1120 opposite to and parallel to the first arcuate surface 1110.

[0047] In some embodiments, such as Figures 5 to 7 As shown, the base 1100 can be considered as a structure formed by the overlap of two semi-cylinders with different radii. The lower half of each semi-cylinder overlaps with the other, while the upper half is retained, to form a structure as shown in the diagram. Figures 5 to 7 The base 1100 structure shown.

[0048] As an alternative implementation method, such as Figure 5 and Figure 6 As shown, the axis 1111 of the first arc-shaped surface and the axis 1121 of the second arc-shaped surface are separated by a first distance.

[0049] In some embodiments, such as Figure 5 and Figure 6 As shown, the axis 1111 of the first arc surface and the axis 1121 of the second arc surface are spaced apart by a first distance, so that after the flexible screen 130 is folded, a certain distance can be maintained between the two folded parts of the flexible screen 130, so as to avoid damage to the flexible screen 130 caused by the abrupt bending between the two folded parts of the flexible screen 130.

[0050] In some embodiments, the size of the first distance can be adaptively adjusted according to the overall structural thickness of the foldable display device 100, which will not be elaborated here.

[0051] As an alternative implementation method, such as Figures 3 to 7 As shown, the base 1100 has a first arcuate groove concentric with the first arcuate surface 1110, and the first rotating arm 1200 has a first arcuate plate 1210 matching the first arcuate groove. The first arcuate plate 1210 is housed in the first arcuate groove and can rotate relative to the first arcuate groove. The base 1100 has a second arcuate groove concentric with the second arcuate surface 1120, and the second rotating arm 1300 has a second arcuate plate 1310 matching the second arcuate groove. The second arcuate plate 1310 is housed in the second arcuate groove and can rotate relative to the second arcuate groove.

[0052] In some embodiments, such as Figure 6 As shown, the base 1100 has a first arc-shaped groove concentric with the first arc-shaped surface 1110. Correspondingly, the first rotating arm 1200 has a first arc-shaped plate 1210 matching the first arc-shaped groove. By placing the first arc-shaped plate 1210 in the first arc-shaped groove and rotating it relative to the first arc-shaped groove, the first rotating arm 1200 can rotate about the axis of the first arc-shaped groove, thus achieving the purpose of rotating the first rotating arm 1200 about the axis 1111 of the first arc-shaped surface; similarly, as Figure 5 As shown, the base 1100 has a second arc-shaped groove concentric with the second arc-shaped surface 1120. Correspondingly, the second rotating arm 1300 has a second arc-shaped plate 1310 that matches the second arc-shaped groove. By placing the second arc-shaped plate 1310 in the second arc-shaped groove and rotating it relative to the second arc-shaped groove, the second rotating arm 1300 can rotate about the axis of the second arc-shaped groove, thereby achieving the purpose of rotating the second rotating arm 1300 around the axis 1121 of the second arc-shaped surface.

[0053] In some embodiments, such as Figure 3 and Figure 4 As shown, the first arc-shaped groove and the second arc-shaped groove are in the direction of the axis 1111 of the first arc-shaped surface / the direction of the axis 1121 of the second arc-shaped surface ( Figure 3The first rotating arm 1200 and the second rotating arm 1300 are staggered in the left and right directions so that the connection positions of the first rotating arm 1200 and the second rotating arm 1300 with the base are staggered, and the first rotating arm 1200 and the second rotating arm 1300 will not interfere with each other during rotation.

[0054] As an alternative implementation method, such as Figure 5 and Figure 6 As shown, the arc of the first arc plate 1210 is greater than 90° and less than or equal to 180°; the arc of the first arc groove is greater than or equal to the arc of the first arc plate 1210; the arc of the second arc plate 1310 is greater than 90° and less than or equal to 180°; the arc of the second arc groove is greater than or equal to the arc of the second arc plate 1310.

[0055] In some embodiments, such as Figure 5 and Figure 6 As shown, the first arc plate 1210 rotates in the first arc groove, thereby causing the first rotating arm 1200 to rotate at a certain angle relative to the base 1100; the second arc plate 1310 rotates in the second arc groove, thereby causing the second rotating arm 1300 to rotate at a certain angle relative to the base 1100. During the folding and unfolding process of the folding display device 100, the relative folding angle between the first display end 110 and the second display end 120 is 180°. That is to say, the hinge device 1000 needs to be folded 180° relative to each other, and the first rotating arm 1200 and the second rotating arm 1300 need to rotate 90° relative to the base 1100. In order to prevent the first arc plate 1210 of the first rotating arm 1200 from coming out of the first arc groove during rotation, the arc of the first arc plate 1210 is greater than 90° and less than or equal to 180°. At the same time, the arc of the first arc groove is greater than or equal to the arc of the first arc plate 1210. This ensures that the first arc plate 1210 does not come out of the first arc groove during rotation, and also ensures that the first arc groove has sufficient arc to ensure the rotation range of the first arc plate 1210. The arc range of the second arc plate 1310 and the second arc groove is similar, and will not be described again here.

[0056] Optionally, the curvature of the first arc-shaped plate 1210 can be 100°, 120°, 140°, 160°, 180°, etc.; the curvature of the first arc-shaped groove can be 100°, 120°, 140°, 160°, 180°, etc.; the curvature of the second arc-shaped plate 1310 can be 100°, 120°, 140°, 160°, 180°, etc.; and the curvature of the second arc-shaped groove can be 100°, 120°, 140°, 160°, 180°, etc. It should be noted that the curvature of the first arc-shaped plate 1210, the first arc-shaped groove, the second arc-shaped plate 1310, and the second arc-shaped groove can all be the same, any two or three can be the same, or they can all be different.

[0057] In some embodiments, such as Figure 5 and Figure 6 As shown, the first arc plate 1210 and the first arc groove both have an arc angle of 180°, which allows the first rotating arm 1200 to rotate 90° relative to the base 1100 by rotating in the first arc groove through the first arc plate 1210, ensuring the stability of the hinge device 1000 during rotation; it also ensures that the first arc plate 1210 will not protrude relative to the base 1100 and affect the flatness of the first surface 1130 when the hinge device 1000 is unfolded. Similarly, the second arc plate 1310 and the first arc groove both have an arc angle of 180°, which allows the second rotating arm 1300 to rotate 90° relative to the base 1100 by rotating in the second arc groove through the second arc plate 1310, ensuring the stability of the hinge device 1000 during rotation; it also ensures that the second arc plate 1310 will not protrude relative to the base 1100 and affect the flatness of the first surface 1130 when the hinge device 1000 is unfolded.

[0058] As an alternative implementation method, such as Figure 3 As shown, the hinge device 1000 also includes a synchronous component 1500, which is connected to the first rotating arm 1200 and the second rotating arm 1300 respectively for synchronous transmission between the first rotating arm 1200 and the second rotating arm 1300.

[0059] In some embodiments, such as Figure 3 As shown, the first rotating arm 1200 and the second rotating arm 1300 can be driven in tandem through the synchronous component 1500, so that the first display end 110 and the second display end 120 can be linked together during the unfolding and folding process of the folding display device 100.

[0060] As an alternative implementation method, such as Figure 3 As shown, the co-moving assembly 1500 includes multiple co-moving gears, which are sequentially meshed and connected. The opposite sides of the multiple co-moving gears mesh with the first rotating arm 1200 and the second rotating arm 1300, respectively.

[0061] In some embodiments, such as Figure 3As shown, the synchronous motion assembly 1500 is connected by multiple synchronous motion gears meshing sequentially, and meshes with the first rotating arm 1200 and the second rotating arm 1300 respectively, realizing the linkage between the first rotating arm 1200 and the second rotating arm 1300. For example, the synchronous motion assembly 1500 is composed of four synchronous motion gears meshing sequentially. The two sides of the synchronous motion structure formed by the four synchronous motion gears mesh with the first rotating arm 1200 and the second rotating arm 1300 respectively, so as to realize the transmission connection between the first rotating arm 1200 and the second rotating arm 1300. Thus, during the unfolding and folding process of the hinge device 1000, the first rotating arm 1200 and the second rotating arm 1300 can rotate synchronously, realizing synchronous rotation from 0° to 180°.

[0062] As an alternative implementation method, such as Figure 3 As shown, the hinge device 1000 also includes a torque component 1600, which is connected to the first rotating arm 1200 and the second rotating arm 1300 respectively, and is used for the stop-start function of the first rotating arm 1200 and the second rotating arm 1300.

[0063] In some embodiments, such as Figure 3 As shown, by setting a torque component 1600 between the first rotating arm 1200 and the second rotating arm 1300, the torque component 1600 enables the first rotating arm 1200 and the second rotating arm 1300 to have a stop-start function, thereby enabling the hinge device 1000 to have a stop-start function during unfolding and folding, and thus enabling the folding display device 100 to unfold to different angles and maintain at the corresponding unfolding angle, so as to meet the usage requirements of different unfolding angles.

[0064] In some embodiments, such as Figure 3As shown, the torque assembly 1600 includes a first synchronous rotating shaft 1610, a second synchronous rotating shaft 1620, a concave cam connecting rod 1640, two concave cams 1630, and two elastic elements 1650. The first synchronous rotating shaft 1610 rotates synchronously with the first rotating arm 1200 and is located at the first end of the base 1100; the second synchronous rotating shaft 1620 rotates synchronously with the second rotating arm 1300 and is located parallel to the first synchronous rotating shaft 1610 at the first end of the base 1100; that is, the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620 rotate synchronously with the first rotating arm 1200 and the second rotating arm 1300, respectively, and are located on the same side of the base 1100. Meanwhile, two concave cams 1630 are respectively sleeved on the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620. The two concave cams 1630 rotate synchronously with the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620. The concave cam connecting rod 1640 is simultaneously sleeved on the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620. The contact end faces of the concave cams 1630 and the concave cam connecting rod 1640 are provided with mutually cooperating arc-shaped protrusions and arc-shaped grooves. Two elastic elements 1650 are respectively sleeved on the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620. The elastic elements 1650 provide elastic pressure between the contact end faces of the concave cams 1630 and the concave cam connecting rod 1640.

[0065] In some embodiments, such as Figure 3 As shown, the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620 of the torque assembly 1600 are respectively engaged or fixedly connected to the synchronous gear in the synchronous motion assembly 1500; or the two concave cams in the torque assembly are respectively engaged or fixedly connected to the synchronous gear in the synchronous motion assembly 1500, which can enable the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620 to be linked, or enable the two concave cams 16 to be linked. At the same time, since the first synchronous rotating shaft 1610 rotates synchronously with the first rotating arm 1200, and the second synchronous rotating shaft 1620 rotates synchronously with the second rotating arm 1300, under the combined action of the synchronous gear and the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620, or under the combined action of the synchronous gear and the two concave cams, the first rotating arm 1200 and the second rotating arm 1300 can be linked.

[0066] For example, the first synchronous rotating shaft 1610 is engaged or fixedly connected to one of the synchronous gears in the synchronous rotating assembly 1500, and rotates synchronously with the synchronous gear; the second synchronous rotating shaft 1620 is engaged or fixedly connected to another synchronous gear in the synchronous rotating assembly 1500, and rotates synchronously with the synchronous gear, ultimately achieving linkage between the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620. As another example, a concave cam 1630 is engaged or fixedly connected to one of the synchronous gears in the synchronous rotating assembly 1500, and rotates synchronously with the synchronous gear; another concave cam 1630 is engaged or fixedly connected to another synchronous gear in the synchronous rotating assembly 1500, and rotates synchronously with the synchronous gear, ultimately achieving linkage between the two concave cams 1630.

[0067] In some embodiments, such as Figure 3 As shown, during the unfolding and folding process of the hinge device 1000, the concave cam connecting rod 1640 is pressed onto the concave cam 1630 by two elastic elements 1650. The two concave cams 1630 rotate synchronously with the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620, respectively. During the rotation of the concave cam 1630, the resistance between the arc-shaped protrusion and the arc-shaped groove can realize the stop function of the two concave cams 1630, thereby realizing the stop function of the hinge device 1000. During the unfolding or folding of the hinge device 1000, under the action of external force, the first rotating arm 1200 and the second rotating arm 1300 rotate synchronously relative to the base 1100; at the same time, the first synchronous rotating shaft 1610 rotates synchronously with the first rotating arm 1200, and the second synchronous rotating shaft 1620 rotates synchronously with the second rotating arm 1300, thereby driving the two concave cams 1630 to rotate synchronously. The concave cams 1630 overcome the resistance between the arc-shaped protrusion and the arc-shaped groove to rotate. When the external force is removed, the concave cams 1630 stop rotating due to the resistance between the arc-shaped protrusion and the arc-shaped groove. At the same time, the first synchronous rotating shaft 1610 and the second synchronous rotating shaft 1620 stop rotating, so that the first rotating arm 1200 and the second rotating arm 1300 stop rotating relative to the base, realizing the locking point of the first rotating arm 1200 and the second rotating arm 1300, that is, realizing the stop-and-go function of the hinge device 1000.

[0068] In some embodiments, such as Figure 3As shown, the elastic element 1650 can be a disc spring. One disc spring is sleeved on the first synchronous rotating shaft 1610, and the other disc spring is sleeved on the second synchronous rotating shaft 1620, and is installed and limited by the nut 1660. The torque value of the torque component 1600 is related to the weight and rebound force of the folding display device 100. The pressure of the disc spring on the concave cam connecting rod 1640 on the first synchronous rotating shaft 1610 can be adjusted by adjusting the distance of the nut 1660 screwed into the first synchronous rotating shaft 1610, and the pressure of the disc spring on the concave cam connecting rod 1640 on the second synchronous rotating shaft 1620 can be adjusted by adjusting the distance of the nut 1660 screwed into the second synchronous rotating shaft 1620, thereby adjusting the magnitude of the rotational resistance of the concave cam connecting rod 1640 to the two concave cams 1630. This achieves the adjustment of the torque of the torque component 1600 so that the torque component 1600 can meet the torque requirements of different folding display devices 100.

[0069] Based on the same inventive concept, this application also provides a foldable display device 100, such as... Figures 8 to 14 As shown, the foldable display device 100 includes a first display end 110, a second display end 120, a flexible screen 130, and the aforementioned hinge device 1000. The second display end 120 is connected to the first display end 110 and can be folded relative to the first display end 110. The flexible screen 130 is disposed on the first display end 110 and the second display end 120. The hinge device 1000 is located between the first display end 110 and the second display end 120. The first rotating arm 1200 is connected to the first display end 110, and the second rotating arm 1300 is connected to the second display end 120. The first surface 1130 is correspondingly disposed to the flexible screen 130. The radius difference between the first arc surface 1110 and the second arc surface 1120 is equal to the thickness difference between the first display end 110 and the second display end 120.

[0070] Since the folding display device 100 provided by the present invention includes the hinge device 1000 of the above-mentioned technical solution, the folding display device 100 provided by the present invention has all the beneficial effects of the hinge device 1000, which will not be elaborated here.

[0071] In some embodiments, such as 3 to Figure 7 as well as Figures 10 to 14As shown, the first display terminal 110 and the second display terminal 120 are connected by a hinge device 1000. Meanwhile, the flexible screen 130 is stacked on one side of the first display terminal 110, the hinge device 1000 and the second display terminal 120, and the flexible screen 130 corresponds to the first surface 1130 of the base 1100 in the hinge device 1000. During the unfolding and folding process of the folding display device 100, the first rotating arm 1200 of the hinge device 1000 rotates around the axis 1111 of the first arc-shaped surface, with a rotation range of 0° to 90°. At the same time, the rotating side of the first display end 110 rotates in contact with the first arc-shaped surface 1110, and the rotating side of the first display end 110 rotates with the radius of the first arc-shaped surface 1110 as the radius of rotation. The second rotating arm 1300 of the hinge device 1000 rotates around the axis 1121 of the second arc-shaped surface. At the same time, the rotating side of the second display end 120 rotates in contact with the second arc-shaped surface 1120, and the rotating side of the second display end 120 rotates with the radius of the second arc-shaped surface 1120 as the radius of rotation. Since the radius difference between the first arc surface 1110 and the second arc surface 1120 is equal to the thickness difference between the first display end 110 and the second display end 120, the radius difference between the first arc surface 1110 and the second arc surface 1120 can be used to offset the thickness difference between the first display end 110 and the second display end 120, so that the first display end 110 and the second display end 120 have different rotation radii to match the different thicknesses of the first display end 110 and the second display end 120.

[0072] As an alternative implementation method, such as Figures 3 to 7 as well as Figures 10 to 14 As shown, the first display end 110 includes a first middle frame 111 and a first housing 112 disposed on the first middle frame 111. A first rotating arm 1200 is connected to the first middle frame 111, and a first arcuate surface 1110 is in rotatable contact with the first housing 112. The second display end 120 includes a second middle frame 121 and a second housing 122 disposed on the second middle frame 121. A second rotating arm 1300 is connected to the second middle frame 121, and a second arcuate surface 1120 is in rotatable contact with the second housing 122.

[0073] In some embodiments, such as Figures 3 to 7 as well as Figures 10 to 14 As shown, the first display end 110 is fixedly connected to the first rotating arm 1200 of the hinge device 1000 via the first middle frame 111, as... Figure 6 and Figure 11 As shown, the first arc-shaped plate 1210 of the first rotating arm 1200 is located in the first arc-shaped groove of the base 1100. The other end of the second rotating arm 1200 opposite to the first arc-shaped plate 1210 may be provided with a fixing hole to fix it to the first middle frame 111. The second display end 120 is fixedly connected to the second rotating arm 1300 of the hinge device 1000 through the second middle frame 121. Figure 5and Figure 11 As shown, the second arc-shaped plate 1310 of the second rotating arm 1300 is located in the second arc-shaped groove of the base 1100. The other end of the second rotating arm 1300 opposite to the second arc-shaped plate 1310 can be provided with a fixing hole to fix it to the second middle frame 121; ultimately achieving the purpose of connecting the first display end 110 and the second display end 120 through the hinge device 1000. Simultaneously, the first housing 112 is disposed on the first middle frame 111, and the second housing 122 is disposed on the second middle frame 121, respectively used to protect the internal structures of the first display end 110 and the second display end 120. Because the thicknesses of the first display end 110 and the second display end 120 are different, the distances between the first housing 112 and the flexible screen 130, and between the second housing 122 and the flexible screen 130, are different. The distance between the first housing 112 and the flexible screen 130 is the same as the radius of the first arc-shaped surface 1110, and the distance between the second housing 122 and the flexible screen 130 is the same as the radius of the second arc-shaped surface 1120. Figures 11 to 14 As shown, by making the first housing 112 rotate into contact with the first arc-shaped surface 1110, and the first housing 112 rotates along the first arc-shaped surface 1110 about the axis 1111 of the first arc-shaped surface, the rotation radius of the first housing 112 can be matched with the thickness of the first display end 110. Similarly, by making the second housing 122 rotate into contact with the second arc-shaped surface 1120, and the second housing 122 rotates along the second arc-shaped surface 1120 about the axis 1121 of the second arc-shaped surface, the rotation radius of the second housing 122 can be matched with the thickness of the second display end 120. Through the asymmetrical design of the first arc-shaped surface 1110 and the second arc-shaped surface 1120, the first display end 110 and the second display end 120 can have different design thicknesses to meet the requirements of the foldable display device 100 for thinness and lightness.

[0074] In some embodiments, such as Figure 10 As shown, the foldable display device 100 may be equipped with multiple hinge devices 1000 to connect the first display end 110 and the second display end 120. Figure 10 In the embodiment shown, the folding display device 100 is provided with four hinge devices 1000, that is, the first middle frame 111 and the second middle frame 121 are connected together by the four hinge devices 1000 respectively.

[0075] In other embodiments, the foldable display device 100 may have two or more hinge devices to connect the first display end 110 and the second display end 120, and to allow the first display end 110 and the second display end 120 to have different thicknesses. For example, the first display end 110 and the second display end 120 may be connected by two, three, four, five, six, seven, eight, or more hinge devices 1000. Generally, when the size of the first display end 110 and the second display end 120 is large, a relatively large number of hinge devices 1000 can be used to connect them to ensure the stability of the foldable display device 100 when folded and unfolded; when the size of the first display end 110 and the second display end 120 is small, a relatively small number of hinge devices 1000 can be used to connect them to reduce the manufacturing cost of the foldable display device 100.

[0076] As an alternative implementation method, such as Figure 7 as well as Figures 11 to 14 As shown, the hinge device also includes a water droplet inclined plate 1400. The rotating end of the water droplet inclined plate 1400 is rotatably mounted on the first middle frame 111, and the swing end of the water droplet inclined plate 1400 opposite to the rotating end is adjacent to the first arc-shaped surface 1110.

[0077] In some embodiments, by providing a teardrop-shaped inclined plate 1400 on the side of the first arcuate surface 1110 of the base 1100, during the unfolding and folding process of the foldable display device 100, the teardrop-shaped inclined plate 1400 is hinged to the first middle frame 111 and can swing relative to the first middle frame 111, supporting the non-display side of the flexible screen 130, so that the flexible screen 130 forms a half teardrop and half U-shaped bending shape after folding, so that the teardrop bending shape corresponds to the relatively thick first display end 110, in order to meet the offset margin after the flexible screen 130 moves relative to the base 1100 after folding, and the U-shaped bending shape corresponds to the relatively thin second display end 120, so as to reduce the bending stress on the flexible screen 130 and reduce the risk of problems after the flexible screen 130 is folded.

[0078] The folding process of the foldable display device 100 in this embodiment is as follows:

[0079] like Figure 11 As shown, the first display end 110, the hinge device 1000 and the second display end 120 are in a horizontal state in sequence, and the unfolding angle of the folding display device 100 is 180°.

[0080] like Figure 12As shown, a certain external force is applied to the second display end 120, and the second middle frame 121 of the second display end 120 rotates around the axis 1121 of the second arc surface through the second rotating arm 1300, and the second housing 122 rotates synchronously with the second arc surface 1120; the first middle frame 111 of the first display end 110 rotates around the axis 1111 of the first arc surface through the first rotating arm 1200, and the first housing 112 rotates synchronously with the first arc surface 1110; the water droplet inclined plate 1400 rotates relative to the first middle frame 111 to form a water droplet bending angle.

[0081] like Figure 13 As shown, as the folding proceeds, the second display end 120 rotates 45° around the axis 1121 of the second arc surface, the first display end 110 rotates 45° around the axis 1111 of the first arc surface, and the water droplet inclined plate 1400 rotates further relative to the first middle frame 111 to increase the formed water droplet bending angle, so that the folding display device 100 is folded to 90°.

[0082] like Figure 14 As shown, as folding progresses, the second display end 120 rotates 90° around the axis 1121 of the second arc-shaped surface, and the first display end 110 rotates 90° around the axis 1111 of the first arc-shaped surface. The teardrop-shaped inclined plate 1400 further rotates relative to the first middle frame 111 to increase the formed teardrop bending angle, causing the folding display device 100 to fold to 0°. The first display end 110 drives the flexible screen 130 to bend into a teardrop bending state, and the second display end 120 drives the flexible screen 130 to bend into a U-shaped bending state. The flexible screen 130 ultimately forms a bending shape that is half teardrop and half U-shaped. The bending shape of the flexible screen 130 has one less external bending structure than the complete teardrop bending shape, thus having less stress and reducing the risk of failure of the flexible screen 130.

[0083] As an alternative implementation method, such as Figure 8 As shown, the foldable display device 100 also includes a support foot 140, which is disposed on the second housing 122 and is retractable relative to the second housing 122.

[0084] In some embodiments, by providing a support foot 140 that can extend and retract relative to the second housing 122 on the second housing 122, when the foldable display device 100 is unfolded to 180° for use, the support foot 140 extends relative to the second housing 122 to support the second display end 120, thereby compensating for the thickness difference between the first display end 110 and the second display end 120; when the foldable display device 100 is unfolded to other angles for use, the support foot 140 retracts relative to the second housing 122 and is hidden inside the second housing 122, making the second display end 120 more aesthetically pleasing overall.

[0085] As an alternative implementation method, such as Figure 8 As shown, the telescopic height of the support foot 140 is the same as the thickness difference between the first display end 110 and the second display end 120.

[0086] In some embodiments, by making the extension height of the support foot 140 the same as the thickness difference between the first display end 110 and the second display end 120, when the foldable display device 100 is unfolded to 180° for use, the support foot 140 can be set to support the second display end 120, thereby offsetting the thickness difference between the first display end 110 and the second display end 120. This ensures that when the foldable display device 100 is unfolded to 180° for use, the support positions formed by the non-display sides of the first display end 110 and the second display end 120 remain flush, thus protecting the second display end 120 and ensuring the safety of the foldable display device 100 when unfolded to 180° for use.

[0087] In some embodiments, the support foot 140 may include a lifting assembly and a pad connected to the lifting assembly. The pad may be made of materials such as thermoplastic elastomer or rubber. When the support foot 140 is retracted and hidden relative to the second display end 120, the pad remains flush with the surface of the second display end 120. When the folding display device 100 is unfolded 180° and placed on a support device such as a desktop, the support foot 140 extends relative to the second display end 120, and the pad is between the lifting assembly and the support device such as the desktop.

[0088] In some embodiments, the lifting assembly adopts a telescopic structure such as a sleeve structure, a telescopic structure, or a folding structure.

[0089] In the description of this application, it should be understood that the terms "axis", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0090] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0091] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0093] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hinge device, characterized in that, The hinge device includes: A base having a first surface and a first arcuate surface and a second arcuate surface opposite to the first surface, wherein the radius of the first arcuate surface is greater than the radius of the second arcuate surface; A first rotating arm, rotatably connected to the base, wherein the axis of rotation of the first rotating arm coincides with the axis of the first arcuate surface; and, The second rotating arm is rotatably connected to the base, and the axis of rotation of the second rotating arm coincides with the axis of the second arc-shaped surface; The base has a first arc-shaped groove concentric with the first arc-shaped surface, and the first rotating arm has a first arc-shaped plate matching the first arc-shaped groove. The first arc-shaped plate is housed in the first arc-shaped groove and can rotate relative to the first arc-shaped groove. The base has a second arc-shaped groove concentric with the second arc-shaped surface, and the second rotating arm has a second arc-shaped plate that matches the second arc-shaped groove. The second arc-shaped plate is housed in the second arc-shaped groove and can rotate relative to the second arc-shaped groove.

2. The hinge device as claimed in claim 1, characterized in that, The axis of the first arc-shaped surface is spaced apart from the axis of the second arc-shaped surface by a first distance.

3. The hinge device as described in claim 1 or 2, characterized in that, The hinge device further includes: The synchronous motion component is connected to the first rotating arm and the second rotating arm respectively for synchronous motion transmission between the first rotating arm and the second rotating arm.

4. The hinge device as described in claim 3, characterized in that, The synchronous component includes: Multiple co-moving gears are connected and meshed sequentially, with their opposite sides meshing with the first rotating arm and the second rotating arm, respectively.

5. The hinge device as described in claim 3, characterized in that, The hinge device further includes: A torque assembly is connected to the first rotating arm and the second rotating arm respectively, and is used for the stop-start function of the first rotating arm and the second rotating arm.

6. The hinge device as claimed in claim 5, characterized in that, The torque component includes: A first synchronous rotating shaft is disposed on the base and rotates synchronously with the first rotating arm; The second synchronous rotating shaft is arranged parallel to the first synchronous rotating shaft on the base and rotates synchronously with the second rotating arm; A concave cam connecting rod, which is simultaneously sleeved on the first synchronous rotating shaft and the second synchronous rotating shaft; Two concave cams are respectively sleeved on the first and second synchronous rotating shafts. The concave cams are in contact with each other, and the contact end faces of the concave cams and the concave cam connecting rods are provided with mutually cooperating arc-shaped protrusions and arc-shaped grooves; and... Two elastic elements are respectively sleeved on the first synchronous rotating shaft and the second synchronous rotating shaft, and the elastic elements provide elastic pressure between the contact end faces of the concave cam and the concave cam connecting rod.

7. A foldable display device, characterized in that, The foldable display device includes: First display end; A second display terminal is connected to the first display terminal and can be folded relative to the first display terminal; A flexible screen, wherein the flexible screen is disposed on the first display end and the second display end; and, The hinge device as described in any one of claims 1 to 6, wherein the hinge device is located between the first display end and the second display end, the first rotating arm is connected to the first display end, the second rotating arm is connected to the second display end, and the first surface is correspondingly disposed with respect to the flexible screen; The radius difference between the first arc-shaped surface and the second arc-shaped surface is equal to the thickness difference between the first display end and the second display end.

8. The foldable display device as claimed in claim 7, characterized in that, The first display terminal includes a first middle frame and a first housing disposed on the first middle frame, the first rotating arm is connected to the first middle frame, and the first arc-shaped surface is in rotatable contact with the first housing; the second display terminal includes a second middle frame and a second housing disposed on the second middle frame, the second rotating arm is connected to the second middle frame, and the second arc-shaped surface is in rotatable contact with the second housing.

9. The foldable display device as claimed in claim 8, characterized in that, The hinge device further includes: A water droplet inclined plate, wherein the rotating end of the water droplet inclined plate is rotatably mounted on the first middle frame, and the swinging end of the water droplet inclined plate opposite to the rotating end is adjacent to the first arc-shaped surface.

10. The foldable display device as claimed in claim 8, characterized in that, The foldable display device also includes: Support feet, which are disposed on the second housing and are retractable relative to the second housing.

11. The foldable display device as claimed in claim 10, characterized in that, The extension height of the support pad is the same as the thickness difference between the first display end and the second display end.

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