Foldable device

Abstract

The application relates to the field of folding devices, aims to solve the problems that the hinge structure of an inside-outside folding folding device is complex and a flexible screen needs to meet inside-outside folding requirements, and provides a foldable device which comprises a main body and a flexible screen. The main body comprises a first body, a second body and a third body arranged in sequence; the first body and the third body are respectively rotatably connected to the two sides of the second body in the width direction. The flexible screen comprises a first screen part, a first bending screen part, a second screen part, a second bending screen part and a third screen part connected in sequence; the three screen parts are respectively attached to the front faces of the three bodies. The first body can be folded to be overlapped with the second body; the third body can be folded to be overlapped with the folded first body. The thickness of the side of the first body connected to the second body is relatively large, and the thickness of the side far away from the second body is relatively small. The foldable device has the beneficial effects of compact and reasonable structure, small thickness and the flexible screen only needs to meet inside folding requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of folding devices, in particular, to a foldable device. BACKGROUND

[0002] It is known that a three-fold device generally adopts an inside-outside folding design, that is, these folding devices have two folds, including one inside fold (folding with the screen facing inwards) and one outside fold (folding with the screen facing outwards).

[0003] However, the folding device adopting the inside-outside folding scheme has the problem that the hinge structure is complex and the flexible screen needs to meet the requirements of both inside and outside folding. SUMMARY

[0004] The present application provides a foldable device to solve the problem that the folding device with inside-outside folding has a complex hinge structure and the flexible screen needs to meet the requirements of both inside and outside folding.

[0005] In a first aspect, an embodiment of the present application provides a foldable device, comprising a main body and a flexible screen. The main body comprises a first body, a second body and a third body arranged in sequence; the first body and the third body are respectively rotatably connected to two sides of the second body in the width direction. The flexible screen comprises a first screen part, a first bending screen part, a second screen part, a second bending screen part and a third screen part connected in sequence; the first screen part is attached to the front face of the first body, the second screen part is attached to the front face of the second body, and the third screen part is attached to the front face of the third body. The first body can be folded to overlap the second body, so that the first screen part and the second screen part are opposite and sandwiched between the front face of the first body and the front face of the second body; the third body can be folded to overlap the first body after folding, so that the third screen part is sandwiched between the back face of the first body and the front face of the third body. Among them, the thickness of the first body near the second body is larger, and the thickness of the first body away from the second body is smaller.

[0006] In the foldable device of the present application, the first body and the second body are folded inwards, and the third body and the second body are folded inwards, and the thickness of the first body near the second body is larger, and the thickness of the first body away from the second body is smaller, which reduces the design difficulty of the rotating connection structure between the first body and the second body, and fully utilizes the space between the second body and the third body after folding to reduce the overall thickness of the foldable device. At the same time, in this structure, the flexible screen is sandwiched inside the body and is not easy to be damaged, and the flexible screen only needs to meet the requirement of inside folding, and the performance requirement of the flexible screen is small.

[0007] In a possible implementation, the first body is wedge-shaped with the thickness gradually changing in the width direction.

[0008] In the embodiment, the first body is wedge-shaped, and the appearance after unfolding is more beautiful. When folded, the space between the second body and the third body can be fully utilized, which is beneficial to reducing the total thickness of the foldable device after folding and the design difficulty of the rotating connection structure between the first body and the second body.

[0009] In a possible implementation, the included angle between the front surface and the back surface of the first body is 0.5-2°.

[0010] In the embodiment, the included angle is set to 0.5-2°, which can realize the gradual change of the thickness of the first body and does not cause too much influence on the appearance of the first body.

[0011] In a possible implementation, the thickness of the first body connected to one side of the second body is 4-8 mm, and the thickness of the first body away from the second body is 2-5 mm; the included angle between the front surface and the back surface of the first body is 0.5-2°. The thickness of the second body is 4-8 mm, and the front surface and the back surface of the second body are parallel to each other. The thickness of the third body connected to one side of the second body is 5-8 mm, and the thickness of the third body away from the second body is 2-8 mm; the included angle between the front surface and the back surface of the first body is 0-2°.

[0012] In the embodiment, the size is set reasonably, and a foldable device with smaller thickness can be obtained.

[0013] In a possible implementation, the third body is wedge-shaped with the thickness gradually changing along the width direction, and the thickness of the side of the third body connected to the second body is larger, and the thickness of the side of the third body away from the second body is smaller. The included angle between the front surface and the back surface of the third body is equal to the included angle between the front surface and the back surface of the first body.

[0014] In the embodiment, after the first body is folded to overlap the second body and the third body is folded to overlap the first body, the back surface of the overlapped first body and the front surface of the third body are attached, and the thickness of the first body and the thickness of the third body are complementary, so that the overall thickness of the two bodies remains basically constant. The foldable device after folding is in a state that the front surface and the back surface (i.e., the back surface of the second shell and the back surface of the third shell) are parallel to each other, which conforms to the appearance of the electronic device habituated by consumers. Of course, the "parallel" in the embodiment does not need to be completely parallel, but a slightly larger included angle than 0° caused by a certain range of geometric tolerance is allowed, such as the included angle being within 0-1°.

[0015] In a possible implementation, the front surface and the back surface of the third body are parallel.

[0016] In this embodiment, the third body can be thicker on the side away from the second body, which although makes the front and back of the folded foldable device not parallel to each other, facilitates the arrangement of side keys (such as power key, volume key, etc.) and more structures in the third body. And when the included angle between the front and back of the folded foldable device is not large (such as less than 5°), the influence on the overall appearance and use experience of the device is small.

[0017] In a possible implementation, the third body is provided with a key structure on the side away from the second body.

[0018] In this embodiment, the third body is exposed on the side away from the second body, which facilitates the arrangement and operation of the key structure.

[0019] In a possible implementation, the first body includes a wedge-shaped part with gradually changing thickness in the width direction and an equal-thickness part with constant thickness connected on one side or both sides of the wedge-shaped part in the width direction.

[0020] In this embodiment, the first body part is wedge-shaped and part is equal-thickness, having different shapes.

[0021] In a possible implementation, the wedge angle of the wedge-shaped part is 0.5-1.8°.

[0022] This embodiment gives the range of the wedge angle of the first body in the form of wedge-shaped and part equal-thickness.

[0023] In a possible implementation, in the state that the first body is folded to overlap the second body, the first screen part and the second screen part overlap each other, and the first bent screen part is bent into a water drop shape. In the state that the third body is folded to overlap the folded first body, the third screen part overlaps the back of the first body, and the second bent screen part is bent into a U shape.

[0024] In this embodiment, based on the wedge-shaped design of the first body, the required turning angle of the second screen part and the third screen part from the unfolded state to the folded state is less than 180°, which compared with the common scheme of rotating 180°, has certain decline in the folding performance requirement of the flexible screen.

[0025] In a possible implementation, in the state that the first body is folded to overlap the second body, the first screen part and the second screen part are attached or have a spacing of less than 1.0 mm, and the first bent screen part bent into a water drop shape includes a circular arc segment, a first transition segment and a second transition segment; the first transition segment is transitionally connected between the circular arc segment and the first screen part, and the second transition segment is transitionally connected between the circular arc segment and the second screen part.

[0026] In the embodiment, the water-drop-shaped folding scheme of the flexible screen can make the spacing between the screens smaller or even directly adhere, and can reduce the total thickness after folding. However, in order to realize the water-drop-shaped folding scheme, the thickness of the two sides of the body (the rotating connection position of the first body and the second body in the embodiment) is required to be larger, which is not conducive to the control of the total thickness after folding. The U-shaped folding scheme of the flexible screen has a large spacing after folding, which limits the control of the total thickness after folding. In the embodiment, the first body is wedge-shaped, which cleverly realizes that the thickness of the first body near the water-drop-shaped folding side is larger (which is conducive to meeting the requirement of the water-drop-shaped folding scheme on the thickness of the connection of the first body), and the thickness of the first body near the U-shaped folding side is smaller (which reduces the required spacing of the U-shaped folding, and fully utilizes the space in the spacing range), so that the structure has high compactness, and the thickness of the folded device after folding can be greatly reduced compared with the known technology.

[0027] In a possible implementation, the first body and the second body are rotationally connected through a first rotating structure.

[0028] In the embodiment, the first rotating structure and the second rotating structure are used to realize the rotational connection of the adjacent bodies.

[0029] In a possible implementation, the first rotating structure and / or the second rotating structure is a hinge structure.

[0030] In the embodiment, the hinge structure can better realize the rotational connection of the adjacent bodies.

[0031] In a possible implementation, the foldable device further includes a first supporting structure and a second supporting structure, the first supporting structure is used to support the first folding screen part, and the second supporting structure is used to support the second folding screen part.

[0032] In the embodiment, the first supporting structure and the second supporting structure can support the first folding screen part and the second folding screen part, which is conducive to realizing the water-drop-shaped folding or U-shaped folding of the flexible screen, and conducive to the flexible screen being on a plane when unfolded.

[0033] In a possible implementation, the first support structure includes a first support plate, a second support plate, and a third support plate. The first support plate is rotatably connected to the first body, the second support plate is rotatably connected to the second body, and the third support plate is fixedly connected to the first rotating structure. In a state where the first body and the second body are relatively unfolded, the first support plate and the second support plate are respectively located on two sides of the third support plate, and support surfaces of the first support plate, the second support plate, and the third support plate are in the same plane to jointly support the first curved screen portion. In a state where the first body and the second body are folded to be overlapped with each other, the first curved screen portion is in a drop shape, the first support plate is rotated to be parallel to the first transition section and supports the first transition section from below, the second support plate is rotated to be parallel to the second transition section and supports the second transition section from below, and the third support plate supports the circular arc section from below.

[0034] The first support plate, the second support plate, and the third support plate in the implementation can reliably support the second curved screen portion in both the folded state and the unfolded state of the foldable device.

[0035] In a possible implementation, the second support structure includes a fourth support plate and a fifth support plate. The fourth support plate is fixedly connected to the second body near one side of the second body close to the third body, and the fifth support plate is fixedly connected to the third body near one side of the third body close to the second body. In a state where the third body and the second body are relatively unfolded, support surfaces of the fourth support plate and the fifth support plate are in the same plane to jointly support the second curved screen portion from below. In a state where the third body and the second body are relatively folded to be in the folded state, the fourth support plate is rotated synchronously with the second body to support the second curved screen portion near the junction of the second screen portion and the second curved screen portion, and the fifth support plate is rotated synchronously with the third body to support the second curved screen portion near the junction of the third screen portion and the second curved screen portion.

[0036] The fourth support plate and the fifth support plate in the implementation can reliably support the second curved screen portion in both the folded state and the unfolded state of the foldable device.

[0037] In a possible implementation, the back of the third body is further provided with a secondary display screen, and a protective glass plate is arranged outside the secondary display screen.

[0038] In the implementation, the secondary display screen is arranged to provide a screen display function when the foldable device is folded.

[0039] In a possible implementation, a front camera is arranged on the back of the third body, and the front camera passes through the secondary display screen or is located inside the secondary display screen.

[0040] In the implementation, the secondary display screen arranged on the back of the third body can provide a screen display function in the folded state.

[0041] In a possible implementation, the foldable device further comprises a rear camera and / or a main battery, and the rear camera and / or the main battery are arranged on the second body.

[0042] In this implementation, the second body has a relatively regular size and a relatively large thickness, which is conducive to arranging a camera assembly with a proper size.

[0043] In a possible implementation, the foldable device comprises a flexible screen lead-out wire and an antenna. The flexible screen lead-out wire is led out from the thinner side of the flexible screen corresponding to the first body, and the antenna is arranged on the side of the third body away from the second body.

[0044] In this implementation, the first body is clamped between the second body and the third body, and the edge of the first body is not suitable for arranging a folded antenna. Therefore, the flexible screen lead-out wire is led out from the edge of the first body; the side of the third body away from the second body is not blocked, and the antenna is arranged without affecting the signal quality of the antenna.

[0045] In a possible implementation, the first body comprises a first body main body and a first side shell connected to the first body main body, the second body comprises a second body main body and a second side shell connected to the second body main body, and the third body comprises a third body main body and a third side shell connected to the third body main body; the flexible screen comprises a display area and an outer edge area located at the periphery of the display area. The flexible screen is attached to the front of the first body main body, the second body main body, and the third body main body. The first side shell, the second side shell, and the third side shell jointly form a side shell outer frame surrounding the periphery of the main body, the outer edge area is clamped between the side shell outer frame and the first body main body, the second body main body, and the third body main body, and the side shell outer frame has a width direction gap between one side or both sides of the foldable device in the width direction and the corresponding side of the flexible screen to allow the width direction displacement of the flexible screen relative to the main body when the foldable device changes between different folding states.

[0046] In this implementation, the structure of the body is arranged to allow the flexible screen to move in the width direction when it is bent, and the first side shell, the second side shell, and the third side shell protrude from the outer surface of the flexible screen, so that the flexible screen does not contact the opposite structure when the side shells abut each other after folding, thereby reducing the possibility of friction damage.

[0047] In a possible implementation, the side shell outer frame is provided with a notch corresponding to the rotating connection between the first body and the second body, and a notch corresponding to the rotating connection between the third body and the second body.

[0048] In this implementation, the notch is arranged to avoid the bending interference between the first side shell and the second side shell and between the second side shell and the third side shell when the foldable device is bent.

[0049] In a possible implementation, the back of the first body is recessed in the thickness direction of the first body to form a space for the third body to be accommodated in the portion of the first body away from the second body.

[0050] In this implementation, by setting the first body to be stepped, the first body can also be thicker on the side close to the second body and thinner on the side away from the second body, which is beneficial to reducing the thickness of the whole device. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0052] Figure 1 FIG. 1 is a structural schematic diagram of a first embodiment of a foldable device according to the present application, and the foldable device is in an unfolded state;

[0053] Figure 2 FIG. 2 is a top view of the foldable device of FIG. 1; Figure 1

[0054] Figure 3 FIG. 3 is a structural schematic diagram of the foldable device of FIG. 1 folded into a folded state; Figure 1

[0055] Figure 4 FIG. 4 is a top view of the foldable device of FIG. 3; Figure 3

[0056] Figure 5 FIG. 5 is a structural schematic diagram of the foldable device of FIG. 3 folded into an intermediate state; Figure 1

[0057] Figure 6 FIG. 6 is a structural schematic diagram of a second embodiment of a foldable device according to the present application, and the foldable device is in a folded state;

[0058] Figure 7 FIG. 7 is a structural schematic diagram of a third embodiment of a foldable device according to the present application, and the foldable device is in a folded state;

[0059] Figure 8 FIG. 8 is a structural schematic diagram of a fourth embodiment of a foldable device according to the present application, and the foldable device is in a folded state;

[0060] Figure 9 ​​​​Fig. 1 is a structural schematic view of a foldable device according to an embodiment of the present application; Figure 8 Fig. 2 is a structural schematic view of the foldable device of Fig. 1 in an unfolded state;

[0061] Figure 10 Fig. 3 is an enlarged view of A of Fig. 2; Figure 9

[0062] Figure 11 Fig. 4 is an enlarged view of B of Fig. 2; Figure 9

[0063] Figure 12 Fig. 5 is a structural schematic view of a fifth embodiment of the foldable device according to an embodiment of the present application, the foldable device being in a folded state;

[0064] Figure 13 Fig. 6 is a top view of the foldable device of Fig. 5, the foldable device being in an unfolded state; Figure 12

[0065] Figure 14 Fig. 7 is a structural schematic view of a sixth embodiment of the foldable device according to an embodiment of the present application, the foldable device being in a folded state;

[0066] Figure 15 Fig. 8 is a structural schematic view of a seventh embodiment of the foldable device according to an embodiment of the present application, the foldable device being in a folded state.

[0067] Main element symbol explanation:

[0068] Foldable device 10

[0069] Main body 11

[0070] Flexible screen 12

[0071] First screen part 12a

[0072] Second screen part 12b

[0073] Third screen part 12c

[0074] First bent screen part 12d

[0075] Second bent screen part 12e

[0076] Display area 12f

[0077] Outer edge area 12g

[0078] First transition section d1

[0079] Second transition section d2

[0080] Arc section d3

[0081] First body 13

[0082] ​​​First body main body 13a

[0083] First side shell 13b

[0084] Wedge-shaped part 131

[0085] Uniform thickness part 132

[0086] Second body 14

[0087] Second body main body 14a

[0088] Second side shell 14b

[0089] Third body 15

[0090] Third body main body 15a

[0091] Third side shell 15b

[0092] First rotating structure 16

[0093] Second rotating structure 17

[0094] First support structure 18

[0095] Second support structure 19

[0096] First support plate 20

[0097] Second support plate 21

[0098] Third support plate 22

[0099] Fourth support plate 23

[0100] Fifth support plate 24

[0101] Front camera 25

[0102] Sub-display 26

[0103] Sub-display lead-out wire 26a

[0104] Protective glass plate 27

[0105] Key structure 28

[0106] Rear camera 29

[0107] Main battery 30

[0108] Flexible screen lead-out wire 31

[0109] Antenna 32

[0110] Drive chip 33

[0111] Side shell outer frame 34

[0112] Let the space C1

[0113] Wide gap f1

[0114] Through hole K1

[0115] Notch K2

[0116] Supporting surface P1, P2

[0117] Front surface S1

[0118] Back surface S2

[0119] Width direction Y1

[0120] Thickness direction Y2 DETAILED DESCRIPTION

[0121] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0122] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0123] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0124] Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.

[0125] Embodiments

[0126] Some embodiments of the present application provide a foldable device, which can be a foldable phone, a foldable tablet or other foldable devices.

[0127] Reference Figures 1-5The foldable device 10 provided in this application embodiment includes a main body 11 and a flexible screen 12.

[0128] The main body 11 includes a first body 13, a second body 14, and a third body 15 arranged sequentially. The first body 13 and the third body 15 are rotatably connected to both sides of the second body 14 in the width direction Y1. If the foldable device 10 needs to house mechanical structures or electronic components such as a housing, battery, motherboard, camera assembly, button assembly, and antenna, these components can be rationally distributed across the three bodies as needed. For example, structures with a large thickness, such as the main battery and rear camera, can be placed in the thicker body (e.g., the second body 14), while the button assembly can be located on the side of the third body 15 for convenient operation.

[0129] Through relative rotation, the first fuselage 13, the second fuselage 14, and the third fuselage 15 can be folded into an unfolded state (see [reference]). Figure 1 and Figure 2 ), folded state (see Figure 3 or Figure 4 ), and intermediate states between the folded and unfolded states (such as Figure 5 Generally, the folded state and the unfolded state are the two conventional usage states of this foldable device 10. Of course, it is also possible to design some intermediate states as conventional usage states.

[0130] The flexible screen 12 is a foldable flexible structure, which can be bent at any location, such as an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode (AMOLED) display, a mini organic light-emitting diode (MLED) display, a micro organic light-emitting diode (MOLED) display, a quantum dot light-emitting diode (QLED) display, or a quantum dot light-emitting diode (QLED) display. The flexible screen 12 can also be a structure that is bent only in certain locations, while remaining non-bendable or inflexible in other locations.

[0131] For the inward folding mode as employed in the present embodiment, the flexible screen 12 is folded inwardly, which is also commonly referred to as an "inward screen". Correspondingly, the screen folded outwardly is referred to as an "outward screen" (such as the secondary display screen 26 to be described later).

[0132] In the present embodiment, the flexible screen 12 comprises a first screen portion 12a, a first bending screen portion 12d, a second screen portion 12b, a second bending screen portion 12e and a third screen portion 12c connected in sequence.

[0133] The first screen portion 12a is attached to the front face S1 of the first body 13, the second screen portion 12b is attached to the front face S1 of the second body 14, the third screen portion 12c is attached to the front face S1 of the third body 15, the first bending screen portion 12d substantially corresponds to the rotary connection between the first body 13 and the second body 14, and the second bending screen portion 12e substantially corresponds to the rotary connection between the third body 15 and the second body 14. Each body has a front face S1 and a back face S2 opposite in the thickness direction Y2, wherein the side where the flexible screen 12 is located is defined as the front face S1, and the other side is defined as the back face S2. The "attachment" here can be adhesion or other connection means. Of course, in some embodiments, the attachment of the flexible screen 12 and the body allows a certain relative displacement of the flexible screen 12 relative to the body to accommodate the misalignment of the flexible screen 12 with a certain body due to bending. In some cases where the misalignment is small and can be ignored, the attachment can also be a complete fixed fit connection.

[0134] In the flexible screen 12, the first bending screen portion 12d and the second bending screen portion 12e are bendable structures, and the first screen portion 12a, the second screen portion 12b and the third screen portion 12c can be bendable structures or rigid structures. In some embodiments, the flexible screen 12 is an integral screen structure, and the first screen portion 12a, the first bending screen portion 12d, the second screen portion 12b, the second bending screen portion 12e and the third screen portion 12c have no obvious structural performance difference.

[0135] Referring to Figure 4, the first body 13 can be folded to be overlapped with the second body 14, so that the first screen part 12a and the second screen part 12b are opposite and clamped between the front surface S1 of the first body 13 and the front surface S1 of the second body 14. The first screen part 12a and the second screen part 12b can be completely attached or have a small gap (e.g., less than 1.0 mm). In actual use, the gap can be 0.9 mm, 0.7 mm, 0.5 mm, etc. The third body 15 can be folded to be overlapped with the folded first body 13, so that the third screen part 12c is clamped between the back surface S2 of the first body 13 and the front surface S1 of the third body 15. The third screen part 12c and the back surface S2 of the first body 13 can be completely attached or have a small gap (e.g., less than 1.0 mm). The smaller the gap, the smaller the total thickness of the foldable device 10 in the folded state. When the gap is not zero, the scratches caused by the contact and friction of the outer surface of the flexible screen 12 can be avoided. When the gap is zero, it may be necessary to design a scratch-proof surface, such as a wear-resistant surface, a structure that limits the relative sliding of each body in the folded state, or other feasible scratch-proof designs. To limit the gap, a protruding structure (such as the outer frame 34 in the following embodiment) that protrudes the flexible screen 12 can be provided between the corresponding bodies. The limiting of the overlapped bodies by the protruding structure can ensure that there is a controllable gap between the outer surface of the flexible screen 12 and the opposite structure.

[0136] Referring to Figure 2 , Figure 4 and Figure 5 , the first body 13 is connected to the second body 14 on one side with a larger thickness and on the other side away from the second body 14 with a smaller thickness.

[0137] In the foldable device 10 of the embodiment, the first body 13 and the second body 14 are connected in an inward folding manner, and the first body 13 has a larger thickness on the side close to the second body 14 and a smaller thickness on the side away from the second body 14. This reduces the design difficulty of the rotating connection structure between the first body 13 and the second body 14, and fully utilizes the space between the second body 14 and the third body 15 after folding to reduce the overall thickness of the foldable device 10. In addition, the flexible screen 12 is clamped inside the body in this structure and is not easily damaged, and the flexible screen 12 only needs to meet the inward folding requirement, so the performance requirement of the flexible screen 12 is relatively small.

[0138] In an embodiment, the first body 13 is wedge-shaped with a gradually changing thickness in the width direction Y1, such as an angle between the front surface S1 and the back surface S2 of the first body 13 being 0.5-2°. Of course, the wedge-shaped part of the first body 13 can only extend to a part of the width direction Y1, that is, the thickness dimension thereof can remain constant in part and gradually change in another part along the width direction Y1 of the first body 13.

[0139] The first body 13 is designed as a wedge shape, which is more beautiful when unfolded, and can make full use of the space between the second body 14 and the third body 15 when folded, thereby reducing the overall thickness of the foldable device 10 when folded and the design difficulty of the rotating connection structure between the first body 13 and the second body 14.

[0140] In some embodiments, the back surface S2 of the third body 15 is further provided with a secondary display screen 26, so that the foldable device 10 has a screen display function when folded. The secondary display screen lead-out wire 26a (see Figure 4 ) of the secondary display screen can be led out from the lower edge of the secondary display screen. The secondary display screen 26 does not need to have a folding function, and therefore a protective glass plate 27 can be arranged outside the secondary display screen 26 to protect the secondary display screen 26. Of course, the secondary display screen 26 can also be omitted.

[0141] In the present embodiment, the front surface S1 and the back surface S2 of the first body 13 are both flat surfaces. In some other embodiments, the front surface S1 and / or the back surface S2 of the first body 13 are curved surfaces, but need to maintain the aforementioned condition that the side of the first body 13 close to the second body 14 is thicker and the side away from the second body 14 is thinner.

[0142] In one embodiment, as shown in Figure 4 or Figure 6 , the third body 15 is wedge-shaped with a gradually changing thickness in the width direction Y1, and the side of the third body 15 connected to the second body 14 is thicker and the side away from the second body 14 is thinner, and the included angle between the front surface S1 and the back surface S2 of the third body 15 is equal to the included angle between the front surface S1 and the back surface S2 of the first body 13. In this way, when the first body 13 is folded to overlap the second body 14 and the third body 15 is folded to overlap the first body 13, the back surface S2 of the overlapped first body 13 and the front surface S1 of the third body 15 are in contact, and the thickness of the first body 13 and the thickness of the third body 15 are complementary, so that the overall thickness of the two bodies remains substantially constant, and the foldable device 10 after folding is in a state where the front surface S1 and the back surface S2 (i.e., the back surface S2 of the second shell and the back surface S2 of the third shell) are parallel to each other, which conforms to the appearance of electronic devices that consumers are accustomed to.

[0143] In some other embodiments, the front surface S1 and the back surface S2 of the third body 15 are parallel (as shown in Figure 7The angle between the front surface S1 and the back surface S2 of the first body 13 is less than the angle between the front surface S1 and the back surface S2 of the second body 14, or the angle between the front surface S1 and the back surface S2 of the first body 13 is less than the angle between the front surface S1 and the back surface S2 of the third body 15, so that the thickness of the side of the third body 15 away from the second body 14 can be set to be larger, although the front surface S1 and the back surface S2 of the folded foldable device 10 are not parallel to each other, it is convenient to arrange the key structure 28 (such as power key, volume key, etc.) and arrange more other structures (such as under-screen camera) in the third body 15. And when the angle between the front surface S1 and the back surface S2 of the folded foldable device 10 is not large (such as less than 2°), the influence on the overall appearance and use experience of the device is small.

[0144] Based on the foregoing embodiments, the body size in this embodiment can be designed as follows: the thickness of the side of the first body 13 connected to the second body 14 is 4-8mm, the thickness of the side of the first body 13 away from the second body 14 is 2-5mm, and the angle between the front surface S1 and the back surface S2 of the first body 13 is 0.5-2°; the thickness of the second body 14 is 4-8mm, and the front surface S1 and the back surface S2 of the second body 14 are parallel to each other; the thickness of the side of the third body 15 connected to the second body 14 is 5-8mm, the thickness of the side of the third body 15 away from the second body 14 is 2-8mm, and the angle between the front surface S1 and the back surface S2 of the first body 13 is 0-2°, so that the foldable device 10 before and after folding meets the use requirements in thickness.

[0145] Mainly refer to Figure 3 In some embodiments, in the state that the first body 13 is folded to be overlapped with the second body 14, the first screen part 12a and the second screen part 12b are overlapped with each other, and the first bent screen part 12d is bent into a drop shape. In the state that the third body 15 is folded to be overlapped with the first body 13 after folding, the third screen part is overlapped with the back surface S2 of the first body 13, and the second bent screen part 12e is bent into a U shape (or a ball bat shape). In this embodiment, based on the wedge-shaped design of the first body 13, the turning angle of the second screen part 12b and the third screen part 12c from the unfolded state to the folded state is less than 180°, compared with the common scheme of rotating 180°, the folding performance requirement of the flexible screen 12 is reduced to a certain extent.

[0146] In the state that the first body 13 is folded to be overlapped with the second body 14, the first screen part 12a and the second screen part 12b are overlapped or the distance therebetween is less than 1.0mm, and the first bent screen part 12d bent into a drop shape includes an arc segment d3, a first transition segment d1 and a second transition segment d2. The first transition segment d1 is transitionally connected between the arc segment d3 and the first screen part 12a, and the second transition segment d2 is transitionally connected between the arc segment d3 and the second screen part 12b.

[0147] The water-drop-shaped bending scheme of the flexible screen 12 can make the spacing between the screens smaller or even directly attached, which can reduce the total thickness of the folded structure. However, to achieve the water-drop-shaped bending scheme, the thickness of the two sides of the body (the rotation connection position of the first body 13 and the second body 14 in the embodiment) is required to be larger, which is not conducive to the control of the total thickness after folding. The U-shaped bending scheme of the flexible screen 12 has a larger spacing after folding, which limits the control of the total thickness after folding. In the embodiment, the first body 13 is designed as a wedge shape, which cleverly realizes the design that the thickness of the first body 13 near the water-drop-shaped bending side is larger (which is conducive to meeting the requirement of the water-drop-shaped bending scheme on the thickness of the connection of the first body 13), and the thickness of the first body 13 near the U-shaped bending side is smaller (which reduces the required spacing of the U-shaped bending and fully utilizes the space in the spacing range), so that the structure has high compactness and the thickness of the folded device after folding can be greatly reduced compared with the known technology.

[0148] In addition to the shape composed of the circular arc segment d3, the first transition segment d1 and the second transition segment d2, the water-drop-shaped bending scheme in the embodiment can also be composed of a single circular arc (not shown), as long as the overall shape is a necked shape, so that the two screen parts (such as the first screen part 12a and the second screen part 12b in the embodiment) connected by the water-drop-shaped part can be matched with a small spacing (such as within 1.0 mm) even at a position near the connection of the water-drop-shaped part; or in other words, the water-drop-shaped bending scheme has a bending center on the inner side and a bending center on the outer side (such as in the embodiment, the bending center of the circular arc segment is on the inner side of the water-drop-shaped part, and the bending centers of the two transition segments and the connection positions of the corresponding two screen parts are on the outer side of the water-drop-shaped part).

[0149] The U-shaped (or called bat-shaped) bending scheme only has a bending center on the inner side. Due to the limitation that the bending radius of the flexible screen 12 cannot be set too small, the spacing between the two screen parts (such as the second screen part 12b and the third screen part 12c in the embodiment) connected by the U-shaped opening cannot be set as small as the water-drop-shaped connection scheme (such as 2.0-5.0 mm or more according to the material or performance of the flexible screen 12). There are various schemes to achieve the rotation connection between adjacent bodies. In the embodiment, the first body 13 and the second body 14 are rotationally connected through the first rotation structure 16, and the third body 15 and the second body 14 are rotationally connected through the second rotation structure 17. Alternatively, the first rotation structure 16 and the second rotation structure 17 adopt a hinge structure. The hinge structure generally includes a middle part (not shown) and side connection parts (not shown) rotationally connected to both sides of the middle part, and the two bodies (such as the first body 13 and the second body 14, or the second body 14 and the third body 15) that need to be rotationally connected are connected to the two side connection parts, respectively, so that the two bodies can be relatively rotated through the hinge structure.

[0150] The first rotating structure 16, the second rotating structure 17 or the hinge structure corresponding to the rotating connection of the body in the embodiment can be a structure with multiple rotating centers or a multi-link or other existing structure with the same function, as long as it can realize the rotating connection of the body and the relative unfolding or folding of the body, which will not be described here.

[0151] As shown in Figures 8-11 The foldable device 10 further includes a first support structure 18 and a second support structure 19, the first support structure 18 being used to support the first bent screen part 12d, and the second support structure 19 being used to support the second bent screen part 12e.

[0152] Optionally, the first support structure 18 includes a first support plate 20, a second support plate 21 and a third support plate 22. The first support plate 20 is rotatably connected to the first body 13, the second support plate 21 is rotatably connected to the second body 14, and the third support plate 22 is fixedly connected to the first rotating structure 16. For example, when the first rotating structure 16 adopts the aforementioned hinge structure, the third support plate 22 is fixedly connected to the middle part of the hinge structure, the first body 13 and the second body 14 are connected to the two side connecting parts respectively, at the same time, the first support plate 20 is rotatably connected to the first body 13, and the first support plate 20 and the side connecting part on the side are transmissionally connected through a connecting rod structure (not shown) or the like, based on a four-bar linkage mechanism or the like transmission mode, so as to realize that when the first body 13 and the side connecting part rotate about 180° relative to the middle part to fold from the unfolded state to the folded state, the rotation is transmitted to the first support plate 20 through the connecting rod structure, so that the first support plate 20 rotates by a corresponding angle relative to the first body 13, such as equal to the bending angle of the first transition section d1 (i.e. the angle of the first transition section d1 relative to the first screen part 12a), so as to adapt to support the first transition section d1; the second support plate 21 is rotatably connected to the second body 14, and the second support plate 21 and the side connecting part on the side are transmissionally connected through a connecting rod structure (not shown) or the like, based on a four-bar linkage mechanism or the like transmission mode, so as to realize that when the second body 14 and the side connecting part rotate about 180° relative to the middle part to fold from the unfolded state to the folded state, the rotation is transmitted to the second support plate 21 through the connecting rod structure, so that the second support plate 21 rotates by a corresponding angle relative to the second body 14, such as equal to the bending angle of the second transition section d2 (i.e. the angle of the second transition section d2 relative to the second screen part 12b), so as to adapt to support the second transition section d2.

[0153] Through the above arrangement, in the unfolded state of the first body 13 and the second body 14 (see Figure 9 and Figure 10), the first support plate 20 and the second support plate 21 are respectively located on both sides of the third support plate 22, and the support surfaces P1 of the first support plate 20, the second support plate 21 and the third support plate 22 are in the same plane to jointly support under the first folding screen part 12d; in the state that the first body 13 and the second body 14 are folded to overlap each other (see Figure 8 ), the first folding screen part 12d is in a drop shape, the first support plate 20 is rotated to be parallel to the first transition section d1 and is supported below the first transition section d1; the second support plate 21 is rotated to be parallel to the second transition section d2 and is supported below the second transition section d2; and the third support plate 22 is supported below the circular arc section d3.

[0154] Again referring to Figures 8-11 , the second support structure 19 includes a fourth support plate 23 and a fifth support plate 24. The fourth support plate 23 is fixedly connected to one side of the second body 14 close to the third body 15, and the fifth support plate 24 is fixedly connected to one side of the third body 15 close to the second body 14.

[0155] In the state that the third body 15 and the second body 14 are relatively unfolded (see Figure 9 and Figure 11 ), the support surfaces P2 of the fourth support plate 23 and the fifth support plate 24 are in the same plane to jointly support under the second folding screen part 12e;

[0156] In the state that the third body 15 and the second body 14 are relatively folded to the folded state (see Figure 8 ), the fourth support plate 23 is rotated synchronously with the second body 14 to be supported near the junction of the second screen part 12b and the second folding screen part 12e, and the fifth support plate 24 is rotated synchronously with the third body 15 to be supported near the junction of the third screen part 12c and the second folding screen part 12e.

[0157] Figure 6 and Figure 7 The above-mentioned first support structure 18 and the second support structure 19 are also shown in the embodiment shown.

[0158] Of course, in other embodiments, the first support structure 18 and the second support structure 19 can also adopt other support structures; or, when the first folding screen part 12d and / or the second folding screen part 12e does not need additional support, the first support structure 18 and / or the second support structure 19 can also not be provided.

[0159] Again referring to Figure 6 and Figure 7 , in an embodiment, the back surface S2 of the third body 15 is provided with a front camera 25.

[0160] As Figure 6As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better.

[0161] As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better. Figure 7 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better.

[0162] Figure 6 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better. Figure 7 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better.

[0163] Figure 6 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better. Figure 7 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better.

[0164] Figure 6 As shown in FIG. 1, the front camera 25 is arranged through the auxiliary display screen 26 on the back surface S2 of the third body 15, so as to use the thickness space of the auxiliary display screen 26, and the thickness requirement of the third body 15 is relatively small. In this embodiment, a through hole K1 is arranged on the auxiliary display screen 26, used for accommodating the front end of the front camera 25, so that the front camera 25 is only shielded by the protective glass plate 27 and is not shielded by the auxiliary display screen 26, and the shooting quality is better. Figure 7 ​​​In one embodiment, the foldable device 10 comprises a flexible screen lead-out line 31 and an antenna 32. The flexible screen lead-out line 31 is used for electrical connection between the flexible screen 12 and the main board of the foldable device 10, and the antenna 32 is used for transmitting and receiving wireless signals. The flexible screen lead-out line 31 is led out from the thinner side of the flexible screen 12 corresponding to the first body 13, and the antenna 32 is arranged on the side of the third body 15 away from the second body 14.

[0165] In the folding scheme in this embodiment, the first body 13 is clamped between the second body 14 and the third body 15, and the edge of the first body 13 is not suitable for arranging the folded antenna. Therefore, the flexible screen lead-out line 31 is led out from the edge of the first body 13, for example, by using the COP (chip on plastic) bending technology, and the driving chip 33 is arranged on the surface of the flexible screen lead-out line 31 to reduce the board space occupied by the flexible screen lead-out line 31. The side of the third body 15 away from the second body 14 is not blocked, and the antenna 32 is arranged without affecting the signal quality of the antenna.

[0166] For reference, see Figure 12 and Figure 13In an embodiment, the first body 13 comprises a first body main body 13a and a first side shell 13b connected to the first body main body 13a, the second body 14 comprises a second body main body 14a and a second side shell 14b connected to the second body main body 14a, and the third body 15 comprises a third body main body 15a and a third side shell 15b connected to the third body main body 15a. The flexible screen 12 comprises a display area 12f and a peripheral area 12g outside the display area 12f. It should be noted that the division of the flexible screen 12 into the display area 12f and the peripheral area 12g, or into the first screen part 12a, the second screen part 12b, the third screen part 12c, the first bending screen part 12d and the second bending screen part 12e is only two different ways of dividing the flexible screen 12, and does not mean that the flexible screen 12 respectively independently has the above two groups of structures. The flexible screen 12 is attached to the front surface S1 of the first body main body 13a, the second body main body 14a and the third body main body 15a. The first side shell 13b, the second side shell 14b and the third side shell 15b together form a side shell outer frame 34 surrounding the outer periphery of the main body 11. The peripheral area 12g is sandwiched between the side shell outer frame 34 and the first body main body 13a, the second body main body 14a and the third body main body 15a, and the side shell outer frame 34 has a width direction gap f1 between one side or both sides of the foldable device 10 in the width direction Y1 and the corresponding side of the flexible screen 12 to allow the width direction displacement of the flexible screen 12 relative to the main body 11 when the foldable device 10 changes in different folding states. In this embodiment, the attachment between the flexible screen 12 and the corresponding body can be arranged to allow a certain misalignment of the flexible screen 12 relative to the body when folding. There are many methods to achieve this effect, for example, the adhesive strength of the adhesive layer between the flexible screen 12 and the first body main body 13a and the second body main body 14a is relatively low to allow a certain misalignment. In this embodiment, the structure of the body can allow the flexible screen 12 to misalign in the width direction Y1 when bending, and at the same time, the first side shell 13b, the second side shell 14b and the third side shell 15b protrude from the outer surface of the flexible screen 12, and after folding, the side shells abut against each other to prevent the flexible screen 12 from contacting the structure on the opposite side, thereby reducing the possibility of friction damage.

[0167] In an embodiment, referring to Figure 10 , the side shell outer frame 34 is provided with a notch K2 corresponding to the rotating connection between the first body 13 and the second body 14, and the rotating connection between the third body 15 and the second body 14, so that the first side shell 13b and the third side shell 15b are in the shape of an open U, respectively covering three outer edges of the first body main body 13a and the third body main body 15a; the second side shell 14b comprises two strip-shaped parts, covering the upper and lower edges of the second body main body 14a. The arrangement of the notch K2 can avoid the bending resistance between the first side shell 13b and the second side shell 14b, and between the second side shell 14b and the third side shell 15b when bending.

[0168] For reference Figure 14 In the embodiment, the first body 13 is connected to the second body 14 in a structure that the side connected to the second body 14 is thicker and the side away from the second body 14 is thinner. As shown in FIG. 1, the first body 13 is in a wedge shape. In other embodiments, the first body 13 can be in other forms to achieve the purpose of connecting the second body 14 in a structure that the side connected to the second body 14 is thicker and the side away from the second body 14 is thinner. Figure 14 As shown in FIG. 3, the back of the first body 13 is recessed in the thickness direction of the first body 13 on the side away from the second body 14 to form a space C1, so that the first body 13 is in a stepped shape with the part corresponding to the space C1 being thinner and the part outside the space C1 being thicker. In the folded state, the third body 15 is accommodated in the space C1. In the folded state, the total thickness of the foldable device 10 is mainly determined by the thickness of the second body 14, the thickness of the third body 15 and the thickness of the thinner part of the first body 13, and the thickness of the thinner part of the first body 13 can be set to be thinner, so that a smaller overall thickness can be obtained. Optionally, the outer surface of the outwardly protruding part of the side of the first body 13 close to the second body 14 can be set to be flush with the back of the third body 15.

[0169] For reference Figure 15 In the embodiment, the first body 13 is connected to the second body 14 in a structure that the side connected to the second body 14 is thicker and the side away from the second body 14 is thinner. As shown in FIG. 1, the first body 13 is in a wedge shape. In other embodiments, the first body 13 can be in other forms to achieve the purpose of connecting the second body 14 in a structure that the side connected to the second body 14 is thicker and the side away from the second body 14 is thinner. Figure 15 As shown in FIG. 3, the back of the first body 13 is recessed in the thickness direction of the first body 13 on the side away from the second body 14 to form a space C1, so that the first body 13 is in a stepped shape with the part corresponding to the space C1 being thinner and the part outside the space C1 being thicker. In the folded state, the third body 15 is accommodated in the space C1. In the folded state, the total thickness of the foldable device 10 is mainly determined by the thickness of the second body 14, the thickness of the third body 15 and the thickness of the thinner part of the first body 13, and the thickness of the thinner part of the first body 13 can be set to be thinner, so that a smaller overall thickness can be obtained. Optionally, the outer surface of the outwardly protruding part of the side of the first body 13 close to the second body 14 can be set to be flush with the back of the third body 15.

[0170] It can be understood that in other embodiments, the first body 13 can also adopt other forms in addition to the aforementioned whole wedge shape / partial wedge shape / stepped shape to achieve the purpose of connecting the second body 14 in a structure that the side connected to the second body 14 is thicker and the side away from the second body 14 is thinner.

[0171] In summary, in the foldable device 10, the first body 13 and the second body 14 and the third body 15 and the second body 14 are folded inwardly, the first body 13 has a larger thickness on the side close to the second body 14 and a smaller thickness on the side away from the second body 14, the design difficulty of the rotating connection structure between the first body 13 and the second body 14 is reduced, the space between the second body 14 and the third body 15 after folding is fully utilized, the overall thickness of the foldable device 10 is reduced, the flexible screen 12 is not easily damaged since it is clamped on the inner side of the body, and the flexible screen 12 only needs to meet the folding requirement and has a smaller performance requirement.

[0172] The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A foldable device, characterized in that: comprising a main body and a flexible screen; the main body comprises a first body, a second body and a third body arranged in sequence; the first body and the third body are respectively rotatably connected to two sides of the second body in the width direction; the flexible screen comprises a first screen part, a first bending screen part, a second screen part, a second bending screen part and a third screen part connected in sequence; the first screen part is attached to the front face of the first body, the second screen part is attached to the front face of the second body, and the third screen part is attached to the front face of the third body; the first body can be folded to overlap the second body, so that the first screen part and the second screen part are opposite and clamped between the front face of the first body and the front face of the second body; the third body can be folded to overlap the first body after folding, so that the third screen part is clamped between the back face of the first body and the front face of the third body; wherein the first body is connected to the second body on one side with a larger thickness and on the other side with a smaller thickness; in the state that the first body is folded to overlap the second body, the first screen part and the second screen part overlap each other, and the first bending screen part is bent into a drop shape; in the state that the third body is folded to overlap the first body after folding, the third screen part overlaps the back face of the first body, and the second bending screen part is bent into a U shape; the thickness of the first body and the thickness of the third body are complementary, so that in the state that the third body is folded to overlap the first body after folding, the foldable device is in a state that the front face and the back face are parallel to each other. 2.The foldable device according to claim 1, characterized in that: the first body is wedge-shaped with the thickness gradually changing in the width direction. 3.The foldable device according to claim 2, characterized in that: the included angle between the front face and the back face of the first body is 0.5-2°. 4.The foldable device according to claim 2, characterized in that: the thickness of the first body connected to one side of the second body is 4-8mm, and the thickness of the first body away from the second body is 2-5mm; the included angle between the front face and the back face of the first body is 0.5-2°; the thickness of the second body is 4-8mm, and the front face and the back face of the second body are parallel to each other; the thickness of the third body connected to one side of the second body is 5-8mm, and the thickness of the third body away from the second body is 2-8mm; the included angle between the front face and the back face of the third body is 0-2°. 5.The foldable device according to claim 2, characterized in that: the third body is wedge-shaped with the thickness gradually changing in the width direction, and the thickness of the third body connected to one side of the second body is larger, and the thickness of the third body away from the second body is smaller; the included angle between the front face and the back face of the third body is equal to the included angle between the front face and the back face of the first body. 6.The foldable device according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The first fuselage includes a wedge-shaped portion whose thickness gradually changes along the width direction and a portion of constant thickness connected to one or both sides of the wedge-shaped portion along the width direction.

7. The foldable device according to claim 1, characterized in that: When the first body is folded over and overlapped with the second body, the first screen and the second screen are close together or the distance between them is less than 1.0 mm. The first bent screen, which is bent into a teardrop shape, includes an arc segment, a first transition segment, and a second transition segment. The first transition segment is connected between the arc segment and the first screen, and the second transition segment is connected between the arc segment and the second screen.

8. The foldable device according to claim 7, characterized in that: The first fuselage and the second fuselage are rotatably connected by a first rotating structure; The third fuselage and the second fuselage are rotatably connected by a second rotating structure.

9. The foldable device according to claim 8, characterized in that: The first rotating structure and / or the second rotating structure are hinge structures.

10. The foldable device according to claim 9, characterized in that: The foldable device further includes a first support structure and a second support structure, wherein the first support structure is used to support the first bent screen portion and the second support structure is used to support the second bent screen portion.

11. The foldable device according to claim 10, characterized in that: The first support structure includes a first support plate, a second support plate, and a third support plate; The first support plate is rotatably connected to the first machine body, the second support plate is rotatably connected to the second machine body, and the third support plate is fixedly connected to the first rotating structure; With the first body and the second body unfolded relative to each other, the first support plate and the second support plate are respectively located on both sides of the third support plate, and the support surfaces of the first support plate, the second support plate and the third support plate are in the same plane, so as to jointly support the first bent screen. With the first and second bodies folded together, the first bent screen is teardrop-shaped, the first support plate rotates to be parallel to the first transition section and is supported below the first transition section; the second support plate rotates to be parallel to the second transition section and is supported below the second transition section; the third support plate is supported below the arc segment.

12. The foldable device according to claim 10, characterized in that: The second support structure includes a fourth support plate and a fifth support plate; The fourth support plate is fixedly connected to the side of the second fuselage near the third fuselage, and the fifth support plate is fixedly connected to the side of the third fuselage near the second fuselage; When the third body and the second body are unfolded relative to each other, the supporting surfaces of the fourth support plate and the fifth support plate are in the same plane, so as to jointly support the second bent screen. In the folded state, the fourth support plate rotates with the second body to support the second screen and the second bent screen, and the fifth support plate rotates with the third body to support the third screen and the second bent screen.

13. The foldable device of claim 1, wherein: The back of the third body is further provided with a secondary display screen, and a protective glass plate is arranged outside the secondary display screen.

14. The foldable device of claim 13, wherein: The back of the third body is provided with a front camera, and the front camera passes through the secondary display screen or is arranged inside the secondary display screen.

15. The foldable device of claim 1, wherein: The foldable device further comprises a rear camera and / or a main battery, and the rear camera and / or the main battery are arranged on the second body.

16. The foldable device of claim 1, wherein: The foldable device comprises a flexible screen lead wire and an antenna. The flexible screen lead wire is led out from the thinner side of the flexible screen corresponding to the first body, and the antenna is arranged on the side of the third body away from the second body.

17. The foldable device of claim 1, wherein: The first body comprises a first body main body and a first side shell connected to the first body main body, the second body comprises a second body main body and a second side shell connected to the second body main body, and the third body comprises a third body main body and a third side shell connected to the third body main body; the flexible screen comprises a display area and an outer edge area located at the periphery of the display area; The flexible screen is arranged on the front of the first body main body, the second body main body and the third body main body; The first side shell, the second side shell and the third side shell jointly form a side shell outer frame surrounding the periphery of the main body, the outer edge area is arranged between the side shell outer frame and the first body main body, the second body main body and the third body main body, and the side shell outer frame has a width direction gap between one side or both sides of the foldable device in the width direction and the corresponding side of the flexible screen to allow the flexible screen to move relative to the main body in the width direction when the foldable device is in different folding states.

18. The foldable device of claim 17, wherein: The side shell outer frame is provided with a notch corresponding to the rotating connection between the first body and the second body, and corresponding to the rotating connection between the third body and the second body.

19. The foldable device of claim 1, wherein: The back of the first body is recessed in the thickness direction of the first body to form a space for accommodation, so that the first body has a stepped shape with a smaller thickness corresponding to the space for accommodation and a larger thickness outside the space for accommodation; In the folded state, the third body is accommodated in the space for accommodation.

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