CN113993325A

CN113993325A - Folding display device and hinge device thereof

Info

Publication number: CN113993325A
Application number: CN202111360579.9A
Authority: CN
Inventors: 游传坤; 青威; 伍峰平; 张俊; 曾佳
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-01-28
Anticipated expiration: 2041-11-17
Also published as: CN113993325B

Abstract

A folding display device and a hinge apparatus thereof. The hinge device comprises a mounting frame, a transmission mechanism and two rotating mechanisms, wherein the mounting frame comprises a first mounting frame, the first mounting frame is provided with two first shaft holes which are communicated up and down, the two first shaft holes are arranged at intervals left and right, and the two rotating mechanisms are correspondingly arranged in the two first shaft holes in a penetrating mode one by one and are in transmission fit through the transmission mechanism; each set of rotary mechanisms includes: the rotating shaft is rotatably arranged in the first shaft hole in a penetrating way; the first rotating piece is positioned on the upper side of the first mounting frame and is fixedly mounted on the rotating shaft, and a transmission structure is arranged between the first rotating piece and the first mounting frame; the elastic piece is positioned at the lower side of the first mounting frame and upwards presses the first mounting frame; the damping piece is sleeved on the rotating shaft; wherein, drive mechanism is used for keeping two pivots synchronous rotations. The hinge device has larger damping during rotation, is easier to realize the follow-up stop of the hinge device at any rotating position, has smaller volume and is more suitable for folding display equipment.

Description

Folding display device and hinge device thereof

Technical Field

The present invention relates to, but not limited to, the field of display technologies, and in particular, to a hinge device for a foldable display device and a foldable display device.

Background

The existing folding display equipment has the advantages that the volume of a hinge device used for realizing the folding function is smaller, the damping of the hinge device during rotation is smaller, the hinge device is difficult to stop at any rotation position, and the use requirement of a large-size folding display product cannot be met. The existing hinge device with large damping during rotation has larger volume and is not suitable for folding display equipment.

Disclosure of Invention

The application provides a hinge means for folding display device, the damping is bigger during rotation, realizes more easily that hinge means stops along with at arbitrary rotational position, and the volume can be made less moreover, is more applicable to folding display device.

The application also provides a folding display device.

The hinge device for the folding display equipment comprises a mounting frame, a transmission mechanism and two rotating mechanisms, wherein the mounting frame comprises a first mounting frame, the first mounting frame is provided with two first shaft holes, the axis of each first shaft hole is arranged along a first direction, the axes of the two first shaft holes are spaced in a second direction, the first direction and the second direction are intersected, and the two rotating mechanisms are correspondingly arranged in the two first shaft holes in a penetrating mode one by one and are in transmission fit through the transmission mechanism; each set of the rotating mechanisms includes: the rotating shaft is rotatably arranged in the first shaft hole in a penetrating way; the first rotating piece is positioned on the first side of the first mounting frame and fixedly mounted on the rotating shaft, and a transmission structure is arranged between the first rotating piece and the first mounting frame; the elastic piece is positioned on the second side of the first mounting frame and presses the first mounting frame towards the first side of the first mounting frame; the damping piece is sleeved on the rotating shaft and used for increasing the resistance of the rotating shaft during rotation; the transmission mechanism is used for keeping the two rotating shafts to synchronously rotate, and when the two first rotating members synchronously rotate in opposite directions, the first mounting frame can move back to the first mounting frame under the action of the transmission mechanism to press and hold the elastic member.

In an exemplary embodiment, the first direction and the second direction intersect perpendicularly.

In an exemplary embodiment, the first direction is an up-down direction, the second direction is a left-right direction, the first side is an upper side, and the second side is a lower side.

In an exemplary embodiment, the mounting bracket further includes: second mounting bracket and fourth mounting bracket all are equipped with two secondary shaft holes at the interval in the second direction, the fourth mounting bracket is located the first side of first rotation piece, the second mounting bracket is located the first side of fourth mounting bracket, two the pivot is still rotationally worn to locate the secondary shaft hole, two the damping piece centre gripping is in the second mounting bracket with between the fourth mounting bracket, and fixed cover is established two in the pivot.

In an exemplary embodiment, the mounting bracket further includes: the third mounting bracket is equipped with two third shaft holes at the interval in the second direction, the third mounting bracket is located the second side of first mounting bracket, two the pivot is still the one-to-one rotationally wears to locate two the third shaft hole, two the elastic component is all pressed and is held the third mounting bracket with between the first mounting bracket, and the cover is established two in the pivot.

In an exemplary embodiment, the first mounting frame is provided with a first protrusion protruding towards the first rotating member, an end surface of the first protrusion is a first transmission surface, the first rotating member is provided with a second protrusion protruding towards the first mounting frame, an end surface of the second protrusion is a second transmission surface, the first transmission surface and the second transmission surface are matched, and the transmission structure comprises the first transmission surface and the second transmission surface.

In an exemplary embodiment, at least one of the first drive surface and the second drive surface is an undulating surface.

In an exemplary embodiment, the hinge device further includes: the two second rotating parts are correspondingly arranged on the first sides of the two first rotating parts one by one and rotate together with the two first rotating parts.

In an exemplary embodiment, the transmission mechanism includes: the two driving wheels are positioned between the first rotating part and the second rotating part and are fixed on the two rotating shafts in a one-to-one correspondence manner; the two driven wheels are positioned on the inner sides of the two driving wheels and are correspondingly meshed with the two driving wheels one by one, and the two driven wheels are rotatably arranged on the two second rotating parts one by one through two first rotating shafts and are rotatably arranged on the mounting rack through two second rotating shafts; the hinge device further includes: the two driving wheels are positioned on the inner sides of the two transmission rods, one end of each transmission rod is matched with the two second rotating pieces in a one-to-one correspondence mode, the other end of each transmission rod is matched with the two first rotating pieces in a one-to-one correspondence mode, and the two driven wheels and the two transmission rods are used for enabling the two second rotating pieces and the two first rotating pieces to rotate together.

In an exemplary embodiment, one of the opposite ends of the second rotating member and the first rotating member is provided with a hinge hole, and the other is provided with a long hole arranged in a radial direction of the rotating shaft, and one end of the transmission rod is installed in the hinge hole and the other end is rotatably and movably installed in the long hole.

In an exemplary embodiment, the hinge device further includes: the mount pad is located two the back that the second rotated the piece, two the second rotated the piece and all rotationally installed on the mount pad.

The folding display device provided by the embodiment of the invention comprises the hinge device for the folding display device in any embodiment.

In an exemplary embodiment, the folding display device further includes a folding screen fixed to front surfaces of the two second rotating members.

In an exemplary embodiment, the hinge device includes two, and two hinge devices are symmetrically disposed in the first direction.

Compared with the prior art, according to the hinge device for the folding display equipment, when the two first rotating members synchronously and reversely rotate, under the action of the transmission structure, the first mounting frame can move back to the first mounting frame to press and hold the elastic member, so that the damping during the action of the transmission structure is increased, and the damping member can form a damping force for preventing the rotation of the rotating shaft when the rotating shaft rotates, so that the damping during the rotation of the hinge device is larger, the hinge device can be easily stopped at any rotating position, and the use requirement of a large-size folding display product can be met; and the hinge device has simple structure and smaller size, and is more suitable for folding display equipment.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

Fig. 1 is a schematic perspective view of a front side view of a hinge device for a foldable display device according to an embodiment of the present invention;

FIG. 2 is a perspective view of the hinge assembly shown in FIG. 1 from a rear perspective;

FIG. 3 is an exploded view of the hinge assembly of FIG. 1;

FIG. 4 is a schematic top view of the damper of FIG. 3;

fig. 5 is a schematic top view of the second mounting frame in fig. 3.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:

100 first mounting frame, 110 first protrusion, 200 rotating mechanism, 210 rotating shaft, 220 first rotating member, 221 second protrusion, 222 elongated hole, 230 elastic member, 240 damping member, 300 transmission mechanism, 310 driving wheel, 320 driven wheel, 400 second mounting frame, 500 third mounting frame, 600 second rotating member, 610 boss, 700 transmission rod, 800 fourth mounting frame, 900 mounting frame, 910 mating groove.

Detailed Description

The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.

As shown in fig. 1 to 5, the hinge device for a foldable display device according to an embodiment of the present invention includes an installation frame, a transmission mechanism 300, and two rotation mechanisms 200, where the installation frame includes a first installation frame 100, the first installation frame 100 is provided with two first shaft holes that are vertically through-going, the two first shaft holes are spaced from left to right, and the two rotation mechanisms 200 are respectively inserted into the two first shaft holes in a one-to-one correspondence manner and are in transmission fit with each other through the transmission mechanism 300; each set of rotation mechanisms 200 includes: a rotating shaft 210 rotatably inserted through the first shaft hole; the first rotating member 220 is positioned on the upper side of the first mounting frame 100 and is fixedly mounted on the rotating shaft 210, and a transmission structure is arranged between the first rotating member 220 and the first mounting frame 100; an elastic member 230 located at a lower side of the first mounting block 100 and pressing the first mounting block 100 upward (as shown in fig. 3); the damping piece 240 is sleeved on the rotating shaft 210 and used for increasing the resistance of the rotating shaft 210 during rotation; the transmission mechanism 300 is used for keeping the two rotation shafts 210 to rotate in opposite directions synchronously, and when the two first rotation members 220 rotate in opposite directions synchronously, the first mounting frame 100 can move back to the first mounting frame 100 to press the elastic member 230 under the action of the transmission mechanism. The reverse direction includes the opposite direction and the back direction, namely the rotating directions of the two rotating shafts are always opposite.

In the hinge device, when the two first rotating members 220 synchronously rotate in opposite directions, under the action of the transmission structure, the first mounting frame 100 can move back to the first mounting frame 100 to press and hold the elastic member 230, so that the damping during the action of the transmission structure is increased, and the damping member 240 can form a damping force for preventing the rotation of the rotating shaft 210 when the rotating shaft 210 rotates, so that the damping during the rotation of the hinge device is larger, the hinge device can be more easily stopped at any rotating position, and the use requirement of a large-size folding display product can be met; the hinge device is simple in structure, only compact in transverse size and longitudinal size, small in size and more suitable for folding display equipment.

In an exemplary embodiment, as shown in fig. 1 to 5, the mounting bracket further includes: the second mounting frame 400 and the fourth mounting frame 800, which are provided with two second shaft holes, are both located on the upper side of the first rotating member 220, the second mounting frame 400 is located above the fourth mounting frame 800, the two rotating shafts 210 are correspondingly arranged in the second shaft holes, and the two damping members 240 are clamped between the second mounting frame 400 and the fourth mounting frame and fixedly sleeved on the two rotating shafts 210.

The damping member 240 is clamped between the second mounting frame 400 and the first mounting frame 100 and fixedly sleeved on the two rotating shafts 210, the rotating shafts 210 drive the damping member 240 to rotate together when rotating, the damping member 240 slides relative to the second mounting frame 400 and the first mounting frame 100 to form damping, and thus the damping formed by the damping member 240 when the rotating shafts 210 rotate is larger, and the damping when the hinge device rotates is larger. The damping may be further increased (or decreased) by increasing (or decreasing) the number of layers of the damping member 240 and the second mount 400. Damping may be further increased by increasing the roughness of the mating surfaces of the second mount 400, the first mount 100 and the damping member 240.

Illustratively, as shown in fig. 4, the damper 240 is provided as a damper sheet.

The rotating shaft 210 is provided with a non-cylindrical section, and the cross section of the non-cylindrical section may be a triangle, a rectangle, a diamond or other irregular shapes, so that the rotating shaft 210 and the damping member 240 are in transmission fit and the rotating shaft 210 and the first rotating member 220 are in transmission fit.

In an exemplary embodiment, as shown in fig. 1 to 3, the mounting bracket further includes: the third mounting frame 500 with two third shaft holes is located at the lower side of the first mounting frame 100, the two rotating shafts 210 are rotatably arranged in the two third shaft holes in a one-to-one correspondence manner, and the third mounting frame 500 is fixed at the lower ends of the two rotating shafts 210, so that the two elastic members 230 are uniformly pressed between the third mounting frame 500 and the first mounting frame 100. The two elastic members 230 may be coil springs, and the two coil springs are sleeved on the two rotating shafts 210 in a one-to-one correspondence manner, so that the structure is not only single-room, but also has a good use effect.

In an exemplary embodiment, as shown in fig. 1 to 3, the first mounting bracket 100 is provided with a first protrusion 110 protruding upward, an upper surface (i.e., an end surface) of the first protrusion 110 is a first transmission surface, the first rotating member 220 is provided with a second protrusion 221 protruding downward (as shown in fig. 3), a lower surface (i.e., an end surface) of the second protrusion 221 is a second transmission surface, and the first transmission surface and the second transmission surface are matched with each other, and the transmission structure includes a first transmission surface and a second transmission surface.

The first transmission surface can be a bent inclined surface, a curved surface, a wavy surface and the like, and the second transmission surface can also be a bent inclined surface, a curved surface, a wavy surface and the like; the purpose of the present application can be achieved, and the purpose of the present application does not depart from the design concept of the present invention, and therefore, the present application shall not be described herein again, and shall fall within the protection scope of the present application.

In one example, as shown in fig. 1 to 3, one of the first transmission surface and the second transmission surface is provided as a wavy surface extending in the circumferential direction, and the other is provided as a curved surface extending in the circumferential direction (e.g., curved surfaces at two ends symmetrically arranged in the circumferential direction) or a wavy surface extending in the circumferential direction, so that it is better to realize that the two first rotating members 220 can be kept positioned at a plurality of positions to realize different-range follow-up functions.

In an exemplary embodiment, as shown in fig. 1 to 3, the hinge device further includes: the two second rotating members 600 are disposed above the two rotating mechanisms 200 in a one-to-one correspondence, and rotate together with the two first rotating members 220. The left first rotating member 220 and the left second rotating member 600 rotate in the same direction, and the right first rotating member 220 and the right second rotating member 600 rotate in the same direction.

In one example, as shown in fig. 1-3, the transmission mechanism 300 includes: two driving wheels 310 fixed on the upper ends of the two rotating shafts 210 in a one-to-one correspondence; and two driven wheels 320 engaged with each other, located inside the two driving wheels 310, and engaged with the two driving wheels 310 in a one-to-one correspondence, that is: the left driven wheel 310 is engaged with the left driven wheel 320, the left driven wheel 320 is engaged with the right driven wheel 320, and the right driven wheel 320 is engaged with the right driven wheel 310. Moreover, the upper sides of the two driven wheels 320 are rotatably mounted on the two second rotating members 600 through the two second rotating shafts in a one-to-one correspondence, and the lower sides of the two driven wheels 320 are both rotatably mounted on the second mounting bracket 400 through the two second rotating shafts. The hinge device further includes: the two transmission rods 700 are vertically arranged and located outside the two driving wheels 310, the upper ends of the two transmission rods 700 are correspondingly matched with the two second rotating members 600 one by one, and the lower ends of the two transmission rods 700 are correspondingly matched with the two first rotating members 220 one by one. The two driven pulleys 320 and the two transmission rods 700 are used to realize the rotation of the two second rotating members 600 together with the two first rotating members 220. The hinge device is applied to a folding display apparatus, and a folding screen is positioned at the front sides of two second rotating members 600 and fixed at the front sides of the two second rotating members 600.

Of course, the first rotating shaft and the second rotating shaft on both sides of each driven wheel 320 may also be the same shaft penetrating through the driven wheel 320, and the purpose of the present application may also be achieved.

In one example, as shown in fig. 1 to 3, the two second rotating members 600 are rotating plates that are vertically arranged in the up-down direction, and the two rotating plates are arranged in bilateral symmetry.

In one example, as shown in fig. 1 to 3, one of the opposite ends of the second rotating member 600 and the first rotating member 220 is provided with a hinge hole, and the other is provided with a long hole 222 arranged in a radial direction of the rotating shaft 210, and one end of the driving lever 700 is installed in the hinge hole and the other end is rotatably and movably installed in the long hole 222. The hinge device is applied to a folding display device, when the folding screen is closed (or opened), and the two second rotating members 600 rotate towards the closed position (or rotate back to back towards the open position), the two first rotating members 220 are driven to synchronously rotate towards the closed position (or synchronously rotate back to back towards the open position), and during the rotation process, the transmission rod 700 rotates in the strip hole 222 and simultaneously moves in the strip hole 222.

In an exemplary embodiment, as shown in fig. 2 and 3, the hinge device further includes: and a mounting seat 900 located at the back of the two second rotating members 600, wherein the two second rotating members 600 are rotatably mounted on the mounting seat 900.

In an example, as shown in fig. 3, two fitting grooves 910 are provided on a side surface of the mounting base 900 facing the second rotating member 600, the two fitting grooves 910 are spaced from each other at left and right, a first arc surface is provided inside the fitting groove 910, a boss 610 is provided on a back surface of each second rotating member 600, a second arc surface is provided on a surface of the boss 610, the two bosses 610 are disposed in the two fitting grooves 910 in a one-to-one correspondence manner, and the first arc surface and the second arc surface are fitted with each other, so that the two second rotating members 600 are both rotatably mounted on the mounting base 900.

The folding display device (not shown in the figures) provided by the embodiment of the invention comprises the hinge device for the folding display device described in any one of the above embodiments.

The foldable display device has all the advantages of the hinge device for the foldable display device provided by any of the above embodiments, and will not be described herein again.

In one example, the foldable display device further includes a foldable screen located at front sides of the two second rotating members 600 and fixed at front sides of the two second rotating members 600, the second rotating members 600 rotate in opposite directions to achieve the closing of the foldable screen, and the second rotating members 600 rotate in opposite directions to achieve the opening of the foldable screen.

In one example, two hinge devices are symmetrically arranged up and down on the back side of each folding screen.

In summary, according to the hinge device for the foldable display device provided in the embodiment of the present application, when the two first rotating members rotate in opposite directions synchronously, the first mounting frame can move back to the first mounting frame to press the elastic member under the action of the transmission structure, so that the damping of the transmission structure during operation is increased, and the damping member forms a damping force for blocking the rotation of the rotating shaft when the rotating shaft rotates, so that the damping of the hinge device during rotation is larger, the hinge device can be stopped at any rotating position more easily, and the use requirement of a large-size foldable display product can be met; and the hinge device has simple structure and smaller size, and is more suitable for folding display equipment.

Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and it is intended that the scope of the disclosure be limited only by the appended claims.

Claims

1. The hinge device for the folding display equipment is characterized by comprising a mounting frame, a transmission mechanism and two rotating mechanisms, wherein the mounting frame comprises a first mounting frame, the first mounting frame is provided with two first shaft holes, the axis of each first shaft hole is arranged along a first direction, the axes of the two first shaft holes are spaced in a second direction, the first direction and the second direction are intersected, and the two rotating mechanisms are correspondingly arranged in the two first shaft holes in a penetrating mode one by one and are in transmission fit through the transmission mechanism; each set of the rotating mechanisms includes:

the rotating shaft is rotatably arranged in the first shaft hole in a penetrating way;

the first rotating piece is positioned on the first side of the first mounting frame and fixedly mounted on the rotating shaft, and a transmission structure is arranged between the first rotating piece and the first mounting frame;

the elastic piece is positioned on the second side of the first mounting frame and presses the first mounting frame towards the first side of the first mounting frame; and

the damping piece is sleeved on the rotating shaft and used for increasing the resistance of the rotating shaft during rotation;

the transmission mechanism is used for keeping the two rotating shafts to synchronously rotate, and when the two first rotating members synchronously rotate in opposite directions, the first mounting frame can move back to the first mounting frame under the action of the transmission mechanism to press and hold the elastic member.

2. The hinge assembly of claim 1, wherein the mounting bracket further comprises:

second mounting bracket and fourth mounting bracket all are equipped with two secondary shaft holes at the interval in the second direction, the fourth mounting bracket is located the first side of first rotation piece, the second mounting bracket is located the first side of fourth mounting bracket, two the pivot is still rotationally worn to locate the secondary shaft hole, two the damping piece centre gripping is in the second mounting bracket with between the fourth mounting bracket, and fixed cover is established two in the pivot, first direction with the second direction is crossing perpendicularly.

3. The hinge assembly of claim 1, wherein the mounting bracket further comprises:

the third mounting bracket is equipped with two third shaft holes at the interval in the second direction, the third mounting bracket is located the second side of first mounting bracket, two the pivot is still the one-to-one rotationally wears to locate two the third shaft hole, two the elastic component is all pressed and is held the third mounting bracket with between the first mounting bracket, and the cover establish two in the pivot, first direction with the second direction is crossing perpendicularly.

4. The hinge assembly of claim 1, wherein the first mounting bracket is provided with a first protrusion protruding toward the first rotating member, an end surface of the first protrusion is a first driving surface, the first rotating member is provided with a second protrusion protruding toward the first mounting bracket, an end surface of the second protrusion is a second driving surface, the first driving surface and the second driving surface are matched, and the driving structure comprises the first driving surface and the second driving surface.

5. The hinge assembly of claim 4, wherein at least one of the first drive surface and the second drive surface is a wavy surface.

6. The hinge device according to any one of claims 1 to 5, further comprising:

the two second rotating parts are correspondingly arranged on the first sides of the two first rotating parts one by one and rotate together with the two first rotating parts.

7. The hinge assembly of claim 6, wherein the transmission mechanism comprises:

the two driving wheels are positioned between the first rotating part and the second rotating part and are fixed on the two rotating shafts in a one-to-one correspondence manner; and

the two driven wheels are positioned on the inner sides of the two driving wheels and are correspondingly meshed with the two driving wheels one by one, and the two driven wheels are rotatably arranged on the two second rotating parts one by one through two first rotating shafts and rotatably arranged on the mounting rack through two second rotating shafts; the hinge device further includes:

the two driving wheels are positioned on the inner sides of the two transmission rods, one end of each transmission rod is matched with the two second rotating pieces in a one-to-one correspondence mode, the other end of each transmission rod is matched with the two first rotating pieces in a one-to-one correspondence mode, and the two driven wheels and the two transmission rods are used for enabling the two second rotating pieces and the two first rotating pieces to rotate together.

8. The hinge device according to claim 7, wherein one of the opposite ends of the second rotating member and the first rotating member is provided with a hinge hole, the other is provided with an elongated hole arranged in a radial direction of the rotating shaft, one end of the transmission rod is fitted in the hinge hole, and the other end is rotatably and movably fitted in the elongated hole.

9. The hinge apparatus of claim 6, further comprising:

the mount pad is located two the back that the second rotated the piece, two the second rotated the piece and all rotationally installed on the mount pad.

10. A folding display device characterized by comprising the hinge device for a folding display device according to any one of claims 1 to 9.

11. The foldable display device of claim 10, wherein the hinge assembly is the hinge assembly of claim 6, and further comprising a foldable screen fixed to the front faces of the two second rotating members.

12. The foldable display device of claim 11, wherein the hinge means comprises two, and the two hinge means are symmetrically arranged in the first direction.