Folding hinge and folding display device

Abstract

A folding hinge comprises a plurality of hinges hinged to each other at free ends and fixing devices respectively fixed to the hinges and foldable, the fixing devices comprising a fixed female seat and a fixed male seat, each hinge corresponds to a fixed female seat or a fixed male seat, the fixed male seats and the fixed female seats are connected to each other and can rotate, and the fixed male seat and the fixed female seat are connected to the hinges at intervals; the application also comprises a folding display device.

Description

Technical Field

[0001] The present application relates to the field of communication electronics, and in particular to a folding hinge and a folding display device. Background Art

[0002] With the development of folding screen technology, folding screen mobile phones have become a hot technology. Although the folding screen can be bent, it still cannot be bent 180 degrees. The bent part still needs to maintain a certain R angle, otherwise the screen will be damaged. The existing folding methods are divided into inward folding and outward folding, that is, the screen is on the inside or outside after folding. For example, the Mate X released by Huawei is outward folding, but the problem with outward folding is that the screen is exposed and easily scratched by hard objects, and the folding screen is relatively fragile.

[0003] Regardless of whether it is folded outward or inward, the problem that needs to be solved is how to ensure that when the folding screen is folded, the folding mechanism adapts to the R angle required by the folding part of the screen. At this time, the inner side of the folding part of the folding screen will be slightly shortened, while the outer side of the folding screen will be slightly extended. At this time, the components close to the folding screen must keep changing synchronously, otherwise the screen will be squeezed. And ensure that there is support on the back of the folding screen, otherwise the suspended screen will be damaged when pressed by fingers. Patent application No. 201920305522.0 of the People's Republic of China discloses a folding display device, in which the folding plates disclosed therein are relatively long, and the fixation between each other is through the two ends. When folded, it is easy to fold and warp and cannot remain flat. Summary of the invention

[0004] In view of this, it is necessary to provide a folding hinge and a folding display device, wherein the folding hinge can achieve smooth folding when folding.

[0005] In order to solve the above technical problems, the present application provides a folding hinge, including a plurality of hinges hinged to each other at the free ends and fixing devices respectively fixed to the hinges and foldable, the fixing devices including a fixed female seat and a fixed male seat, each hinge corresponds to a fixed female seat or a fixed male seat, the fixed male seat and the fixed female seat are interconnected and rotatable, and the fixed male seat and the fixed female seat are connected to the hinge at intervals.

[0006] Preferably, the folding hinge comprises at least one set of fixing devices located between two free ends of the hinge bar.

[0007] Preferably, the folding hinge comprises at least two sets of fixing devices located between two free ends of the hinge bar.

[0008] Preferably, each hinge bar is provided with a convex block protruding from the inner surface of the fixing device for assembling, and the convex block is provided with a screw hole.

[0009] Preferably, the fixed female seat and the fixed male seat both include a base, a lower avoidance portion opened at the bottom of the base to accommodate the protrusion, and a screw hole that penetrates the base and is connected to the lower avoidance portion. The fixed female seat also includes a lower limit portion, an upper limit portion and an arc groove located between the upper and lower limit portions extending from the longitudinal ends of the base, and the fixed male seat also includes an arc block extending from the longitudinal ends of the base to cooperate with the arc groove to rotate.

[0010] Preferably, the arc grooves on both sides of the fixed female seat in the longitudinal direction and the arc blocks on both sides of the fixed male seat in the longitudinal direction are formed by extending in opposite directions in the transverse direction; the fixed male seat or fixed female seat assembled on the outermost hinge bar is only provided with one arc block or arc groove.

[0011] Preferably, an upper avoidance portion is provided on the top of the base of the fixed male seat or the fixed female seat, and the fixed female seat and the fixed male seat are screwed into the screw holes of the protrusion through bolts passing through the screw holes on the base, and the nuts of the bolts are accommodated in the upper avoidance portion.

[0012] Preferably, the hinge includes a main shaft, a plurality of strip-shaped bodies respectively arranged on both sides of the main shaft in the transverse direction, and a rotating plate located outside the strip-shaped bodies.

[0013] Preferably, the thickness of the main shaft is greater than that of the strip body and / or the rotating plate, and the main shaft includes a shaft body and a fixing groove opened on the shaft body, the bottom of the fixing groove forms a connecting portion, and the protrusion is arranged on the connecting portion.

[0014] Preferably, one side of the fixing groove is an axis body, and the other side forms a first partition part, and fixing holes are formed at positions corresponding to the axis body and the first partition part, and the folding hinge also includes a reinforcing rod inserted into the fixing hole.

[0015] In order to solve the above technical problems, the present application also provides a folding display device, including the above-mentioned folding hinge, and the folding display device also includes a synchronization mechanism assembled on the folding hinge and a variable distance device hinged on the folding hinge.

[0016] The folding hinge of the present application is provided with at least one set of fixing devices that fix and fold the hinge in the middle of the hinge. The fixing devices achieve the flatness of the middle positions of several hinges through the mutual rotation of the fixing female seat and the fixing male seat, thereby avoiding the problem of bumps and depressions caused by the hinges being unable to maintain relative positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0018] Figure 1 This is a three-dimensional unfolded view of the foldable display device of the present application;

[0019] Figure 2 A three-dimensional unfolded view of the foldable display device of the present application from another angle;

[0020] Figure 3 A three-dimensional unfolded view of the hinge bar of the folding hinge of the present application and a partial enlarged view thereof;

[0021] Figure 4 A three-dimensional diagram of the main axis of the hinge bar of the folding hinge of the present application and a partial enlarged diagram thereof;

[0022] Figure 5 This is an expanded view of the fixing device of the folding hinge of the present application;

[0023] Figure 6 A three-dimensional view of a first fixing member of a fixing device of a folding hinge of the present application;

[0024] Figure 7 A three-dimensional view of a second fixing member of the fixing device of the folding hinge of the present application;

[0025] Figure 8 A three-dimensional diagram of the folding hinge of the present application and a partial enlarged diagram thereof;

[0026] Fig. 9 This is a three-dimensional exploded view of the foldable display device of the present application;

[0027] Fig.10 This is a three-dimensional exploded view of the variable pitch device of the foldable display device of the present application;

[0028] Fig.11 A three-dimensional diagram of a rotating plate of a variable pitch device of a foldable display device of the present application;

[0029] Fig.12 A three-dimensional view of the rotating plate of the variable pitch device of the folding display device of the present application from another angle;

[0030] Fig.13 A three-dimensional diagram of a slider of a variable distance device of a foldable display device of the present application;

[0031] Fig.14 A three-dimensional diagram of a slider of the variable pitch device of the foldable display device of the present application from another angle;

[0032] Fig.15 A three-dimensional diagram of a connecting plate of a variable pitch device of a foldable display device of the present application;

[0033] Fig.16 A three-dimensional diagram of the foldable display device of the present application in a folded state and a partial enlarged diagram thereof;

[0034] Fig.17 This is a three-dimensional diagram and a partial enlarged diagram of the foldable display device of the present application when it is in a folded state, with some components removed. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0036] Key References Figure 1 , Figure 2 As shown, the folding display device of the present application includes a folding hinge, a synchronization mechanism 30 assembled on the folding hinge, and a variable distance device 40 hinged on the folding hinge.

[0037] Please continue reading Figures 1 to 8 , Fig.16 As shown, the folding hinge includes a plurality of hinge bars 10 hinged to each other at both ends, a fixing device 20 for fixing the plurality of hinge bars 10 , and a reinforcing rod 15 .

[0038] The hinge bar 10 includes a main shaft 11 in the middle, at least one strip body 12 hinged to two sides of the main shaft 11 , and a rotating plate 13 hinged to the outer side of the strip body 12 .

[0039] The main shaft 11 includes a shaft body 111, a fixing groove 112, a gear groove 114, a damping groove 115, which are recessed in sequence on both sides of the shaft body 111, a first partition portion 117 located between the fixing groove 112 and the gear groove 114, a second partition portion 118 located between the gear groove 114 and the damping groove 115, and a third partition portion 119 located outside the damping groove 115.

[0040] The inner surface of the fixing groove 112 of the main shaft 11 is in the same horizontal plane as the inner surface of the strip body 1 and the rotating plate 13. The hinge strips 10 are respectively protruded in the transverse direction of the position of the fixing groove 112 to form a convex block 101, and the convex block 101 is provided with a screw hole 102. The convex blocks 101 on the main shaft 11, the strip body 12 and the rotating plate 13 are in the same straight line in the transverse direction.

[0041] Key References Figure 2 , Fig.16As shown, the free end of the main shaft 11 protrudes outward to form a hinge portion 127, and hinge grooves 128 are provided on both lateral sides of the hinge portion 127. The free end of the strip body 12 of the main shaft 11 is provided with a hinge protrusion 129 and a hinge groove 135 hinged in the hinge groove 128 on both lateral sides, and the free end of the rotating plate 13 is provided with a hinge protrusion hinged in the hinge groove 135 of the strip body 12. The hinge grooves 128, 135 are movably hinged to the hinge protrusion 129 through bolts (unnumbered). Two strip bodies 12 and a rotating plate 13 are hinged to both sides of the main shaft 11 in sequence. The hinge structure design of the free end of the hinge bar 10 is described in detail in patent application No. CN201920305522.0, which will not be repeated here.

[0042] The fixing device 20 includes a fixing female seat 21 and a fixing male seat 22 that rotates in cooperation with the fixing female seat 21. The fixing female seat 21 and the fixing male seat 22 both include a base 211, a lower avoidance portion 212 opened at the bottom of the base 211 to accommodate the protrusion 101, an upper avoidance portion 213 opened at the top of the base 211, and a screw hole 214 that penetrates the base 211 and connects the upper and lower avoidance portions 212, 213. The base 211 of the fixing female seat 21 has a lower limit portion 215, an upper limit portion 216 and an arc groove 217 between the upper and lower limit portions 215, 216 extending from both longitudinal ends thereof. The upper and lower limit portions 215, 216 at both longitudinal ends of the fixing female seat 21 extend in opposite directions in the transverse direction, that is, the arc grooves 217 at both longitudinal ends of the fixing female seat 21 extend in opposite directions and are arranged in point symmetry. The fixed male seat 22 further includes arc blocks 219 extending from both longitudinal ends of the seat base 211, the arc blocks 219 match the arc groove 217, and the arc blocks 219 at both longitudinal ends of the fixed male seat 22 extend in opposite directions in the transverse direction and are arranged in point symmetry. The arc blocks 219 are inserted into the arc groove 217 and can rotate in the arc groove 217.

[0043] The fixing female seat 21 and the fixing male seat 22 of the fixing device 20 are screwed on the protrusion 101 of the hinge strip 10 by bolts or screws (not shown), the protrusion 101 fits into the lower avoidance portion 212, the bolt passes through the screw hole 214 and is locked in the screw hole 102 on the protrusion 101, and the nut part of the bolt is received in the upper avoidance portion 213. A fixing female seat 21 is arranged on the protrusion 101 of the spindle 11, and a fixing male seat 22 matching with the fixing female seat 21 is arranged on the strip body 12 adjacent to the spindle 11. By analogy, a fixing female seat 21 or a fixing male seat 22 is fixed on the outermost rotating plate 13, but the fixing female seat 21 or the fixing male seat 22 fixed on the rotating plate 13 only needs to be provided with an arc groove 217 or an arc block 219 at one longitudinal end of the base 211.

[0044] Key References Figure 4 , Figure 8 As shown, after the fixing groove 112 of the main shaft 11 is formed concave, a connecting portion 113 is formed at the bottom of the fixing groove 112, and the inner surface of the connecting portion 113 is on the same horizontal plane as the inner surfaces of the strip body 12 and the rotating plate 13 when in the unfolded state. The thickness of the connecting portion 113 is relatively thin, and the force that the main shaft 11 needs to bear is relatively large, and the strength of the connecting portion 113 is not enough to support it. Therefore, fixing holes 120 are provided at the corresponding positions of the shaft body 111 and the first partition part 117 on both sides of the fixing groove 112, and a reinforcing rod 15 is placed above the fixing groove 112, and the two ends of the reinforcing rod 15 are fixed in the fixing holes 120, and the reinforcing rod 15 is located above the fixing device 20.

[0045] The outer surface of the folding hinge is folded outwards by bonding a folding screen with a folding plate, and the folding plate is fixed on the variable pitch device 40.

[0046] The folding hinge of the present application is provided with at least one set of fixing devices 20 for fixing the main shaft 11, the strip body 12 and the rotating plate 13 at the middle position. The fixing device 20 realizes the flatness of the middle position of the main shaft 11, the strip body 12 and the rotating plate 13 by the mutual rotation of the fixing female seat 21 and the fixing male seat 22, thereby avoiding the problem that the main shaft 11, the strip body 12 and the rotating plate 13 of the folding hinge cannot maintain relative positions and produce bumps.

[0047] See also Figure 1 , Figure 2 , Figure 4 , Fig. 9 , Fig.10 As shown, the synchronization mechanism 30 of the present application is assembled on the main shaft 11 , and the synchronization mechanism 30 includes at least one pair of rotating shafts 31 and gears 35 respectively fixed on the pair of rotating shafts 31 .

[0048] A pair of transversely arranged axial holes 121 are respectively provided on the first and second partition parts 117 and 118 at the longitudinal ends of the gear groove 114 of the main shaft 11 in the transverse direction, and the gear groove 114 is provided with protective parts 122 on both lateral sides to cover the lateral sides of the gear groove 114. The gear groove 114 is provided with notches 1141 on both lateral sides close to the first partition part 117 for connecting the pitch changing device 40.

[0049] The pair of rotating shafts 31 are respectively sleeved in the pair of shaft holes 121, and a pair of gears 35 are fixed on the pair of rotating shafts 31 and located in the gear grooves 114, and the pair of gears 35 mesh with each other. When the pair of rotating shafts 31 are driven by the pitch changing device 40 to rotate, the gears move with the relative movement of the rotating shafts 31, so that the pair of rotating shafts 31 can achieve synchronous rotation amplitude, thereby avoiding the folding screen from being damaged due to inconsistent rotation amplitudes on both sides of the folding screen.

[0050] The folded inner side surface of the longitudinal free end of the main shaft 11 is cut to form a cutout portion 125, and the corresponding position of the third partition portion 119 penetrates to form a part of the shaft hole 121, that is, the shaft hole 121 penetrates the third partition portion 119 and the second partition portion 118 in the longitudinal direction, and does not penetrate the first partition portion 117. A pair of shaft holes 121 are respectively on the same straight line. The second partition portion 118 is located on one side of the damping groove 115 and protrudes to form a stopper 123. The shaft hole 121 is at least partially located and penetrates the stopper 123. The second partition portion 118 is located on one side of the damping groove 115 and a rotating hole 124 is provided on the outer edge of the stopper 123. The cutout portion 125 is respectively formed with a pair of arc grooves 126 corresponding to the lower side of the shaft hole 121. The stopper 123 can also be formed by longitudinally extending from the third partition portion 119 on the side of the damping groove 115.

[0051] The damping groove 115 is provided with a spring 32 sleeved on the outside of the rotating shaft 31, a first damping block 33 sleeved on the outside of the rotating shaft 31, and a second damping block 34 fixed on the rotating shaft 31 and matched with the first damping block 33. The spring 32 is clamped between the third partition portion 119 and the first damping block 33, and the rear end of the second damping block 34 abuts against the abutment portion 123. The first damping block 33 includes a main body portion (not shown) connected as an integral body, through holes (not shown) opened on both sides of the main body portion for the two rotating shafts 31 to pass through, and a concave-convex matching structure opened on one side of the through hole in the longitudinal direction, that is, the first damping block 33 is sleeved on the rotating shaft 31 as a whole. There are two second damping blocks 34, which are respectively fixed on the rotating shaft 31 and rotate with the rotation of the rotating shaft 31. The second damping block 34 is provided with a corresponding concave-convex matching structure corresponding to the concave-convex matching structure of the first damping block 33. Through the elastic pressure of the spring 32, the concave-convex matching structure of the first damping block 33 and the second damping block 34 cooperate with each other to generate phased resistance or assistance, thereby realizing hovering at different positions during the folding process of the folding screen, and producing a better user experience effect.

[0052] See also Figure 4 , Figures 9 to 15 As shown, the pitch changing device 40 includes a rotating seat 41, a driving rod 46 that can rotate in the rotating hole 124 of the main shaft 11, a transmission member 47 placed in the rotating seat 41 and driven by the driving rod 46, a connecting seat 43 that can move relative to the rotating seat 41, and a connecting rod 44 that enables the transmission member 47 to drive the connecting seat 43 to move.

[0053] Key References Figures 10 to 12As shown, the rotating seat 41 includes a seat body 411, a rotating portion 412 extending from a lateral side of the seat body 411 and fixed to the rotating shaft 31, a matching portion 415 formed recessed in the seat body 411 and extending in a direction away from the rotating portion 412, and a first engaging portion 416 formed on the back of the seat body 411 opposite to the matching portion 415. The matching portion 415 is partially recessed on the seat body 411 and partially extended from the seat body 411. The matching portion 415 includes a recessed receiving portion 421, a limiting portion 422 extending upward from both longitudinal sides of the receiving portion 421 and then bending and extending relative to each other, a matching flange 423 formed on both longitudinal outer edges of the receiving portion 421, a connecting hole 424 penetrating the receiving portion 421, a first rotating matching portion 425 penetrating the matching portion 415 and located at one longitudinal end of the connecting hole 424, a state control groove 426 provided on one limiting portion 422, and a column 427 provided on the back of the seat body 411. The connecting hole 424 includes a narrow portion 4242 located at one side of the first rotating matching portion 425 and a wide portion 4241 located at a side away from the first rotating matching portion 425, and the width of the wide portion 4241 is greater than the width of the narrow portion 4242. The state control slot 426 includes an expanded state slot 4261 , a closed state slot 4262 , and an isolation protrusion 4263 located between the expanded state slot 4261 and the closed state slot 4262 .

[0054] The driving rod 46 includes a shaft end 461 that can rotate around the rotating hole 124 and a driving end 462 that cooperates with the transmission member 47. The shaft end 461 includes a shaft structure that extends toward one side in the longitudinal direction and is inserted into the rotating hole 124. The shaft end 461 is located outside the blocking portion 123. There is a gap between the shaft end 461 and the second damping block 34, and the second damping block 34 will not interfere with the rotation of the shaft end 461. The driving end 462 includes a columnar structure formed at the end.

[0055] The linkage rod 44 includes first, second and third rotating branches 441, 442 and 443 arranged in sequence, wherein the first and third rotating branches 441 and 443 are respectively located at two ends of the second rotating branch 442. The first rotating branch 441 is fixed to the first rotating matching portion 425 of the rotating seat 41 by rivets.

[0056] The transmission member 47 includes a plate body 471, a buckle hole 472 provided on the plate body 471 and having a first opening 473 on the outer side in the transverse direction, a third rotational matching portion 474 provided at one end of the plate body 471 away from the buckle hole 472 and riveted to the third rotational branch 443 by rivets, a avoiding portion 475 provided at one side of the third rotational matching portion 474, and an installation cavity 477 opened between the buckle hole 472 and the third rotational matching portion 474. The installation cavity 477 has a second opening 476 on the outer side in the longitudinal direction.

[0057] The connecting seat 43 includes a main body 431, a matching groove 432 extending upward from both sides of the main body 431 and then bending vertically relative to each other, a fixing hole 433 extending from the longitudinal outer side of the matching groove 432, a rubber sleeve 434 sleeved in the matching groove 432, the rubber sleeve 434 covering the matching groove 432 to form a track groove 435, a riveted column 436 provided on the inner surface of the main body 431, a second rotating matching portion 438 provided at the rear end of the inner surface of the main body 431, and a flat spring 437 with one end fixed to the riveted column 436. The other end of the flat spring 437 is fixed to the column 427 of the rotating plate 41, and the flat spring 437 is provided with at least one pair. The second rotating branch 442 of the connecting rod 44 is fixed on the second rotating fitting portion 438 of the connecting seat 43 by rivets, and the first, second and third rotating branches 441, 442, 443 can rotate around the first rotating fitting portion 425, the second rotating fitting portion 438 and the third rotating fitting portion 474 respectively.

[0058] A state control member 45 is installed in the installation cavity 477 of the transmission member 47. The state control member 45 includes a base portion 451 placed in the installation cavity 477, a holding end portion 453 extending from the base portion 451 to the outside of the second opening 476 of the installation cavity 477, and an elastic member 452 clamped between one end of the base portion 451 and the inner wall of the installation cavity 477. The elastic member 452 is positioned by a positioning column (not shown) provided on the inner wall of the installation cavity 477. The elastic member 452 provides elastic force to the state control member 45 so that the holding end portion 453 maintains an outward supporting force. The holding end portion 453 switches between the unfolded state slot 4261 and the closed state slot 4262 of the state control slot 426 of the rotating seat 41 to achieve a positioning function when switching between the unfolded state and the closed state, thereby preventing excessive unfolding or closing operations.

[0059] When assembling the pitch changing device 40, the shaft end 461 of the driving rod 46 is inserted into the rotating hole 124 on the outer side of the blocking portion 123; the rotating portions 412 at the longitudinal ends of the rotating seat 41 are respectively positioned in the gear groove 114 and the arc-shaped groove 126 of the cutout portion 125 and the gear groove 114; the rotating shaft 31 is inserted from one end of the cutout portion 125 into the hole structure on the rotating portion 412 and the shaft hole 121 on the third partition portion 119 and extends to the damping groove 114. 15, at this time, the spring 32 and the first and second damping blocks 33, 34 are respectively mounted on the outside of the rotating shaft 31, and the second damping block 34 is abutted on the blocking portion 123; the rotating shaft 31 is continuously pushed so that the rotating shaft 31 passes through the axial hole 121 on the second partition portion 118 and extends into the gear groove 114, and at the same time, a pair of gears 35 and a rotating portion 412 are inserted into the rotating shaft 31, and the rotating shaft is continuously pushed to be inserted into the axial hole 121 on the first partition portion 117.

[0060] The rotating plate 13 includes a rotating plate base 131, a widening portion 132 extending from both longitudinal sides of the rotating plate base 131 in the transverse direction, longitudinal ends 133 formed at both longitudinal ends of the rotating plate base 131, and a second bite portion 134 formed on the outer side of the longitudinal end portion 133 and cooperating with the first bite portion 416. When the rotating seat 41 is assembled on the main shaft 11, the first bite portion 416 and the second bite portion 134 cooperate with each other and can achieve position limiting and relative movement when the rotating seat 41 rotates.

[0061] Before assembling the rotating seat 41 on the main shaft 11, the pitch changing device 40 needs to be assembled. The pitch changing device is assembled as follows:

[0062] The other end of the flat spring 437 fixed on the riveted column 436 of the connecting seat 43 is fixed to the column 427 on the back of the rotating seat 41, and the second rotating branch 442 of the linkage rod 44 is rotatably fixed to the second rotating matching portion 438 of the connecting seat 43, or the first rotating branch 441 is fixed to the first rotating matching portion 425 of the rotating seat 41. The track groove 435 of the connecting seat 43 is sleeved on the outside of the matching flanges 423 on both sides of the matching portion of the rotating seat 41, and the track groove 435 is covered with a rubber sleeve 434 to make the matching and sliding of the two smooth and avoid noise.

[0063] The state control member 45 is fixed in the installation cavity 477 of the transmission member 47, and then the transmission member 47 is installed in the receiving portion 421 of the rotating seat 41. The limiting portions 422 on both sides of the receiving portion 421 limit the position of the transmission member 47 in the longitudinal direction, and the abutting end portion 453 is elastically matched with the state control groove 426; at this time, the third rotating branch 443 of the linkage rod 44 is rotatably fixed on the third rotating matching portion 474 of the transmission member 47. The first, second, and third rotating branches 441, 442, 443 and the first, second, and third rotating matching portions 425, 438, 474 can be a combination of a hole and a column structure, or can be riveted in two hole structures.

[0064] The driving end 462 of the driving rod 46 is inserted into the buckle hole 472 of the transmission member 47, and the driving rod 46 extends out along the first opening 473 on one side of the buckle hole 472. The rotating portion 412 located in the gear slot 114 extends along the notch 1141 of the gear slot 114.

[0065] The pitch changing device 40 further includes a cover plate 48 , which is fixed above the receiving portion 421 of the rotating seat 41 by screws to fix the transmission member 47 on the rotating seat 41 .

[0066] The operating principle of the variable pitch device of the present application is as follows: when the connecting seat 43 is driven by the shell (such as a mobile phone case) to which it is connected to rotate, the rotating plate 13 drives the hinge 10 to rotate together, and the rotating plate 13 and the rotating seat 41 move relative to each other through the first and second engaging portions 416, 134. At the same time, the driving rod 46 rotates accordingly, and the driving end 462 of the driving rod 46 drives the transmission member 47 to move in the accommodating portion 421 of the rotating seat 41, thereby driving the connecting seat 43 to move by rotating the connecting rod 44 fixed to the transmission member 47. The movement of the connecting seat 43 can cause the shell fixed on the connecting seat 43 to change in length, thereby adapting to the change in length of the folding screen due to bending.

[0067] During this process, the flat spring 437 provides connection and elastic force between the connecting seat 43 and the rotating seat 41. The flat spring 437 can also provide two states, and cooperate with the state control member 45 and the state control slot 426 provided on the rotating seat 41 to realize the positioning of the two positions of the unfolded state and the folded state.

[0068] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A foldable display device, characterized in that: It includes a folding hinge, a synchronization mechanism assembled on the folding hinge, and a variable pitch device hinged on the folding hinge; The folding hinge comprises a plurality of hinges hinged to each other at free ends and fixing devices respectively fixed to the hinges and foldable, the fixing devices have at least one group, each group of the fixing devices respectively comprises a fixing female seat and a fixing male seat, each hinge corresponds to a fixing female seat or a fixing male seat, the fixing male seat and the fixing female seat are connected to each other and can rotate, the fixing male seat and the fixing female seat are connected to the hinges at intervals, each hinge has a protruding block for connecting to the fixing male seat or the fixing female seat on the inner surface of the fixing device assembled, and all the protruding blocks connected to the fixing devices of the same group are on the same straight line in the transverse direction; The hinge bar includes a main shaft, a plurality of strip-shaped bodies respectively arranged on both sides of the main shaft in the transverse direction, and a rotating plate located outside the strip-shaped bodies; The swivel plate is annularly fixed to the top of the shaft, and the swivel plate is adjacent to the first and second swivel plates, which are respectively connected to the swivel plate and the transmission member, so that the swivel plate can move in a horizontal direction relative to the swivel plate. The swivel plate is connected to the second and third swivel plates, which are adjacent to the first and second swivel plates, respectively.

2. The foldable display device according to claim 1, wherein: The folding hinge comprises at least one set of fixing devices located between the two free ends of the hinge bar.

3. The foldable display device according to claim 1, wherein: The folding hinge comprises at least two sets of fixing devices located between the two free ends of the hinge bar.

4. The foldable display device according to claim 1, wherein: The protrusion is provided with a screw hole for connecting the fixing female seat or the fixing male seat.

5. The foldable display device according to claim 4, characterized in that: The fixed female seat and the fixed male seat both include a seat base, a lower avoidance portion opened at the bottom of the seat base to accommodate the protrusion, and a screw hole that penetrates the seat base and is connected to the lower avoidance portion. The fixed female seat also includes a lower limit portion, an upper limit portion and an arc groove located between the upper and lower limit portions extending from the longitudinal ends of the seat base, and the fixed male seat also includes an arc block extending from the longitudinal ends of the seat base to rotate in cooperation with the arc groove.

6. The foldable display device according to claim 5, characterized in that: The arc grooves on both sides of the fixed female seat and the arc blocks on both sides of the fixed male seat are formed by extending in opposite directions in the transverse direction; the fixed male seat or the fixed female seat assembled on the outermost hinge strip is only provided with one arc block or arc groove.

7. The foldable display device according to claim 6, wherein: An upper avoidance portion is provided on the top of the base of the fixed male seat or the fixed female seat. The fixed female seat and the fixed male seat are screwed into the screw holes of the protrusions through bolts passing through the screw holes on the base. The nuts of the bolts are accommodated in the upper avoidance portion.

8. The foldable display device according to claim 1, wherein: The thickness of the main shaft is greater than that of the strip body and / or the rotating plate. The main shaft includes a shaft body and a fixing groove opened on the shaft body. The bottom of the fixing groove forms a connecting portion, and the protrusion is arranged on the connecting portion.

9. The foldable display device according to claim 8, wherein: One side of the fixing groove is an axis body, and the other side forms a first partition part. A fixing hole is formed at a position corresponding to the axis body and the first partition part, and the folding hinge also includes a reinforcing rod inserted into the fixing hole.

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