CN110428730B

CN110428730B - Folding display device

Info

Publication number: CN110428730B
Application number: CN201910515393.2A
Authority: CN
Inventors: 陈小硕; 刘明生; 陆苏; 刘建军; 陈进; 刘昌白
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2022-05-20
Anticipated expiration: 2039-06-14
Also published as: CN110428730A

Abstract

A folding screen comprises attaching parts and folding areas positioned between the attaching parts, wherein when the attaching parts on two sides of each folding area are folded, the folding areas form a water-drop-shaped structure; the application also provides a folding display device.

Description

Folding display device

Technical Field

The present application relates to the field of communications electronics, and more particularly, to a foldable screen and a foldable display device.

Background

With the development of the folding screen technology, the folding screen mobile phone has become a hot spot technology. Although the folding screen can be bent, the 180-degree bending cannot be realized, and the bent part still needs to keep a certain R angle, otherwise the screen can be damaged. The existing folding mode is divided into inward folding and outward folding, namely the screen is positioned at the inner side or the outer side after being folded, for example, Mate X issued by Huawei is outward folding, but the outward folding has the problems that the screen is in an exposed state and is easily scratched by a hard object, and the folding screen is fragile.

At present, each mobile phone manufacturer applies for a folding mechanism, but most of the mobile phone manufacturers have complex structures and too many components, and the R angle folding of the folding screen is realized through a folding plate and a complex hinge mechanism, so that the folding screen is protected from being damaged. However, the complexity of the mechanism and assembly causes instability in folding and is prone to error.

Disclosure of Invention

In view of this, it is desirable to provide a foldable screen and a foldable display device, in which the folding area of the foldable screen is folded into a water drop shape when the foldable screen is in a folded state, so that the folding R angle is increased, and the service life of the foldable screen can be effectively prolonged.

For solving above-mentioned technical problem, this application provides a folding screen, include laminating portion and be located folding region between the laminating portion, when folding region both sides laminating portion is folding, folding region forms the drop column structure.

In order to solve the technical problem, the present application further provides a folding display device, which comprises a first folding plate, a second folding plate, a back cover, a lifting plate, an articulating mechanism, a lifting mechanism and a folding screen, wherein the lifting plate, the articulating mechanism, the lifting mechanism and the folding screen are arranged between the first folding plate and the second folding plate, the back cover comprises a back cover cavity and is sequentially arranged on two pairs of first supporting walls in the back cover cavity and two pairs of second supporting walls between the two pairs of first supporting walls, each pair of first supporting walls is provided with the articulating mechanism, each pair of second supporting walls is provided with the lifting mechanism, the articulating mechanism comprises a sliding block which is respectively limited on the first folding plate and the second folding plate, a transmission rod which is rotatably hinged with one end of the sliding block and a transmission component which is fixedly hinged with the transmission rod, the lifting mechanism comprises a base with first rotating shaft arranged at the two longitudinal ends in a staggered manner, and a lifting piece connected with the first rotating shaft, The driving wheel linked with the lifting piece and the driving piece linked with the driving wheel, the driving rod of the hinge mechanism and the driving piece of the lifting mechanism form an arc-shaped avoiding part and an arc-shaped avoiding space at the relative inner side, the folding screen is attached to one side of the first folding plate and the second folding plate which are deviated from the back cover, and the folding screen is folded into a water-drop-shaped structure in the arc-shaped avoiding part and the arc-shaped avoiding space under a folding state.

Preferably, the first cover side and the second cover side of the back cover are correspondingly positioned between the first supporting walls and are provided with first avoiding grooves, the transmission rod spans the first avoiding grooves, the first avoiding grooves provide rotating space for the transmission rod, the cover side is positioned between the pair of second supporting walls and is provided with second avoiding grooves in a staggered manner, and the pair of transmission members of the lifting mechanism spans the second avoiding grooves and is rotatably hinged with the arc-shaped channels on the first folding plate and the second folding plate.

Preferably, the transmission assembly includes a pair of first shafts, at least a pair of second shafts disposed between the first shafts, at least four gears sleeved on the first shafts and the second shafts and engaged with each other, and first and second clamping plates sleeved on the first and second shafts and located at two ends of the four gears, the transmission rod is fixedly hinged to the two first shafts located at the outer side, the first shafts and the gears thereon are fixed and non-rotatable, the second shafts and the gears thereon are rotatable relatively, and two ends of the first and second shafts are fixed on a pair of the first supporting walls.

Preferably, a plurality of shaft holes with the circle centers positioned on the same straight line are correspondingly arranged on the first clamping plate and the second clamping plate, the first shaft body and the second shaft body are sleeved in the shaft holes, the second shaft body is arranged between the two first shaft bodies side by side, and the transmission assembly further comprises a third clamping plate and a spring clamped between the second clamping plate and the second clamping plate.

Preferably, the first folding plate and the second folding plate correspond to the sliding block, a sliding groove mechanism is arranged at the position of the sliding block, the sliding groove mechanism comprises two convex blocks arranged in parallel, a sliding groove arranged between the two convex blocks and a limiting groove arranged at the bottom of one side of the sliding groove, the sliding block is limited in the sliding groove in a sliding mode, the sliding block comprises a base part, a limiting strip and a hinged end, the limiting strip is limited in the limiting groove by protruding and extending the two transverse sides of the base part, the hinged end is arranged at one end of the base part, and the hinged end is hinged to one end of the transmission rod.

Preferably, the lifting mechanism comprises a base, a lifting member, a driving wheel and a driving member, the base is provided with a first rotating shaft at two longitudinal ends in a staggered manner, the lifting member is connected with the first rotating shaft, the driving wheel is linked with the lifting member, the driving member is linked with the driving wheel, the bottom surface of the base is fixed with the lifting plate, the lifting member comprises a strip-shaped body, a first gear and a strip-shaped hole, the first gear is arranged on the outer side of one end of the strip-shaped body, the strip-shaped hole is arranged at the other end of the strip-shaped body and sleeved outside the first rotating shaft, the driving wheel comprises a second rotating shaft, a second gear and a third gear, the second gear is arranged at one end of the second rotating shaft and meshed with the first gear, the driving member is integrally formed with the second gear, the driving member comprises a main body part, a first connecting end and a second connecting end which are formed at two ends of the main body part, and a fourth gear which is formed on the outer side of the second connecting end and meshed with the third gear, the lifting mechanism further comprises a third rotating shaft passing through the fourth gear and the first gear, the free ends of the second rotating shaft and the third rotating shaft at the two longitudinal ends of the base are limited on the second supporting wall.

Preferably, the first folding plate and the second folding plate are respectively provided with two limiting mechanisms corresponding to the two transmission members, each limiting mechanism is provided with an arc-shaped channel, the transmission members are rotatably hinged in the arc-shaped channels through fourth rotating shafts, and the fourth rotating shafts can rotate in the arc-shaped channels.

Preferably, the strip-shaped hole of the lifting piece has a certain length, and the first rotating shaft can move in the strip-shaped hole for a certain distance; when the transmission piece drives the transmission wheel to rotate, the transmission wheel drives the lifting piece to rotate, so that the lifting piece rotates around the first rotating shaft and stands upright relative to the horizontal plane to lift the base or enables the lifting piece to descend and rotate around the first rotating shaft to be in an inclined state with the horizontal plane until the base is put down.

Preferably, the radius of the second gear of the transmission wheel is smaller than the radius of the third gear, so that the first gear and the fourth gear are coaxial, the second gear is meshed with the first gear, and the third gear is meshed with the fourth gear.

This application folding display device sets up the arc through the relative medial surface at a pair of transfer line and a pair of driving medium and keeps away a position portion and an arc and keep away a space, and width when increasing folding screen fold condition makes the folding R angle increase of folding screen, effectively prolongs the life of folding screen.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1 is a perspective view of a communication device of the present application;

fig. 2 is an exploded perspective view of the communication device of the present application;

FIG. 3 is a perspective view of a foldable display device according to the present application;

fig. 4 is a perspective view of a back cover of the foldable display device of the present application;

FIG. 5 is a perspective view of a folding plate and a lifting plate of the foldable display device of the present application;

FIG. 6 is a perspective view of the hinge mechanism and lift mechanism of the present application mounted to the back cover;

FIG. 7 is a perspective view of the hinge mechanism and lift mechanism of the present application assembled to the folding plate;

FIG. 8 is a perspective view of the hinge mechanism of the present application;

FIG. 9 is a perspective view of the slider and shaft of the hinge mechanism of the present application;

FIG. 10 is a perspective view of a drive assembly of the hinge mechanism of the present application;

FIG. 11 is an exploded perspective view of the drive assembly of the hinge mechanism of the present application;

FIG. 12 is a front view of the damper blade of the drive assembly of the hinge mechanism of the present application;

FIG. 13 is a cross-sectional view taken along line A-A of FIG. 10;

FIG. 14 is an exploded perspective view of the lift mechanism of the present application;

FIG. 15 is a perspective view of a lifting member of the present lift mechanism;

FIG. 16 is a perspective view of a rotating arm of the present lift mechanism;

FIG. 17 is a perspective view of the foldable display device of the present application in a folded state;

FIG. 18 is a view of the hinge mechanism and lift mechanism of the present application in a folded position in cooperation with the back cover;

fig. 19 is a sectional view taken along the line B-B shown in fig. 17.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to 3, the communication device of the present application includes first and

second folding plates

11 and 12, a lifting plate 50 located between the first and

second folding plates

11 and 12, a hinge mechanism 40 and a lifting mechanism 60 fixed to outer sides of the first and

second folding plates

11 and 12, a back cover 20 installed on outer sides of the first and

second folding plates

11 and 12 and connected to the hinge mechanism 40 and the lifting mechanism 60, first and

second housings

31 and 32, and a folding screen 80 attached to inner sides of the first and second folding plates 11 and 12 (as shown in fig. 19).

As shown in fig. 4 and fig. 6, the back cover 20 includes a cover top 21, first and

second cover sides

22 and 23 extending from two sides of the cover top 21, and a back cover cavity 24 enclosed by the cover top 21 and the two

cover sides

22 and 23. The outer surfaces of the cap top 21 and the first and

second cap sides

22, 23 form an arc-shaped outer surface. The back cover cavity 24 is sequentially provided with a pair of first supporting walls 251, two pairs of second supporting walls 261 and a pair of first supporting walls 251 in the length direction. In a specific implementation, at least one pair of first supporting walls 251 or one pair of second supporting walls 261 is provided, and a plurality of shaft holes are provided on the first supporting walls 251 and the second supporting walls 261. A gap is formed between the pair of first support walls 251 for mounting the hinge mechanism 40, and a gap is formed between the pair of second support walls 261 for mounting the elevating mechanism 60.

First avoiding grooves 253 are respectively formed in the two

cover sides

22 and 23 located between the pair of first supporting walls 251, and subsidence portions 254 are respectively formed on the two sides of the

cover sides

22 and 23 located in the first avoiding grooves 253 in a recessed manner. A second avoiding groove 263 is arranged between a pair of second supporting walls 261 corresponding to the

cover sides

22 and 23, respectively, and the second avoiding grooves 263 of the two

cover sides

22 and 23 are arranged in a staggered manner, that is, the two second avoiding grooves 263 are respectively close to one of the second supporting walls 261.

As shown in fig. 2, fig. 5 and fig. 7, the lifting plate 50 is disposed between the first and

second folding plates

11, 12, and the ends of the first and

second folding plates

11, 12 extend to form an extending portion 15 surrounding the lifting plate 50. The first and

second folding plates

11, 12 are provided with a sliding slot mechanism 13 at a position corresponding to the hinge mechanism 40, and the sliding slot mechanism 13 includes two parallel protrusions 131, a sliding slot 133 disposed between the two protrusions 131, and a limiting slot 134 disposed at the bottom of one side of the sliding slot 133 of the protrusion 131. The first and

second folding plates

11, 12 are provided with a limiting mechanism 14 at a position corresponding to the lifting mechanism 60. The limiting mechanism 14 includes two limiting pieces 141 formed by protruding and extending from the surfaces of the first or

second folding plates

11, 12, an accommodating space 143 between the two limiting pieces 141, a connecting piece 142 connected to the two limiting pieces 141 at a side away from the lifting plate 50, and an arc-shaped groove 144 opened on the two limiting pieces 141. The arc-shaped grooves 144 of the two limiting pieces 141 are symmetrically arranged, and the arc-shaped grooves 144 extend to the surface of the first or

second folding plate

11, 12 at the side close to the lifting plate 50. The connecting piece 142 helps to reinforce the strength of the two stopper pieces 141. The two limiting mechanisms 14 correspond to the two second avoiding grooves 263 of the back cover 20, respectively.

As shown in fig. 7 to 13, the hinge mechanism 40 includes a sliding block 41, a transmission assembly 43, and a transmission rod 42 rotatably hinged to the sliding block 41 and the transmission assembly, respectively. The sliding block 41 is fitted in the sliding groove 133 between the two protrusions 13, and the sliding block 41 includes a base 411, a limiting strip 412 protruding from two lateral sides of the base 411 and formed to be limited in the limiting groove 134, and a hinge end 413 disposed at one end of the base 411. The transmission rod 42 includes a rod 421 and two

hinged ends

423 and 424 disposed at two ends of the rod 421. The rod 421 is substantially an arc-shaped bent structure, and an arc-shaped avoiding portion 422 is formed on one side of the rod 421 facing the lifting plate 50, and the arrangement of the arc-shaped avoiding portion 422 is helpful to increase the space width between the two rods 421, so that the inner folding screen 80 (as shown in fig. 19) can be folded with a larger R, thereby reducing the technical difficulty requirement on the folding screen 80.

The transmission assembly 43 includes a pair of first shafts 44, a pair of second shafts 45 disposed between the pair of first shafts 44, first to

fourth splints

481, 482, 483, 484 sequentially sleeved on the first and

second shafts

44, 45, four gears 46 sleeved on the first and

second shafts

44, 45 and clamped between the first and

second splints

481, 482, a spring 49 sleeved on the first shafts 44 and clamped between the second and

third splints

482, 483, and a damping block 47 clamped on the first shafts 44 and the second shafts 45 and disposed between the third and

fourth splints

483, 484. A fastener 485 fixed to the second shaft body 45 is provided on the outer side of the first and

fourth jaws

481, 484 to prevent the first and

fourth jaws

481, 484 from falling off the first or

second shaft body

44, 45. The first and

second shaft bodies

44, 45 are respectively provided with a

first end portion

441, 451 and a

second end portion

444, 454, the first and

second shaft bodies

44, 45 are provided with a

gear mounting portion

442, 452 corresponding to the position where the gear 46 is sleeved, the gear mounting portion 442 of the first shaft body 44 is irregular in shape, preferably square, when the gear 46 is sleeved on the first shaft body 44, the gear 46 and the first shaft body 44 are relatively fixed and non-rotatable; the gear mounting portion 452 of the second shaft body 45 is circular, and when the gear 46 is sleeved on the gear mounting portion 452, the gear 46 can rotate around the second shaft body 45.

Referring to fig. 12 and 13, the damping blocks 47 are divided into two groups, each group holding a first shaft 44 and a second shaft 45. Each damping block 47 includes a block 471 and a first engaging groove 472 and a second engaging groove 473 formed at two ends of the block 471. The first engaging groove 472 is retained on the first shaft 44, the second engaging groove 473 is retained on the second shaft 45, and the damping

block mounting portions

443, 453 are disposed at positions of the first and

second shaft

44, 45 corresponding to the damping block 47. The damping block mounting portion 443 of the first shaft 44 is a circular structure, and the damping block mounting portion 453 of the second shaft 45 is provided with at least two clamping planes. The first engaging groove 472 is rotatable with respect to the first shaft 44, and the second engaging groove 473 is fixed and non-rotatable with respect to the second shaft 45. A plurality of recesses 474 are formed in the first locking groove 472, that is, the first locking groove 472 has a substantially square structure, a radius of an inscribed circle of the first locking groove 472 is smaller than a radius of the damping block mounting portion 443 of the first shaft 44, and when the first locking groove 472 rotates around the damping block mounting portion 443 of the first shaft 44, an elastic friction force is provided, so that a positioning force at any position is realized.

The first and second ends 441, 451 of the first shaft 44 and the second shaft 45 of the hinge mechanism 40 are respectively positioned on the two first supporting walls 251 of the back cover 20. The transmission rod 42 rotates across the first avoiding groove 253 of the back cover 20. The hinged ends 423 of the transmission rod 42 at one side of the first and

second folding plates

11, 12 are hinged to the inner sides of the first ends 441 of the two first shaft bodies 44, respectively, and the hinged ends 423 of the transmission rod 42 and the first shaft bodies 44 are fixed to each other and are not rotatable.

When the hinge mechanism 40 of the present application is operated, the first and

second folding plates

11 and 12 are folded or unfolded to drive the sliding block 41 to move in the sliding slot 133, and thus the driving rod 42 rotates to drive the first shaft 44 to rotate, the rotation of the first shaft 44 rotates the gear 46 thereon and transmits the gear 46 to the second shaft 45 to rotate, and the first engaging slot 472 of the damping block 47 provides an elastic force to the first shaft 44 to block the rotation of the first shaft 44, so as to position any position in the rotating process. The spring 49 provides elastic force to press the gear 46 and the damping block 47 from being locked in rotation.

The first shaft body 44 and the second shaft body 45 are arranged in parallel, and the diameter of the gear 46 can be reduced through the meshing transmission of four gears 46, so that the thickness of the hinge mechanism 40 is thinner; thus, a meshing transmission of 6 or 8 gears, preferably 4 gears, can be provided depending on the situation.

In practical implementation, if the thickness of the hinge mechanism 40 is not considered, the second shaft 45 of the hinge mechanism 40 may be omitted, and only two first shaft bodies 44 are provided, and the two gears 46 on the two first shaft bodies 44 are engaged for transmission.

The hinge mechanism 40 of the present application can connect the first and

second folding plates

11, 12, so that the first and

second folding plates

11, 12 can be unfolded or folded by the transmission assembly 43 of the hinge mechanism 40, and the damping blocks 47 respectively engage the first and

second shaft bodies

44, 45 to provide the first shaft body 44 with resistance against rotation, thereby realizing folding at any position of the foldable display device.

As shown in fig. 14 to 16, the lifting mechanism 60 includes a base 61 having a first rotating shaft 612 at two longitudinal ends, a lifting member 63 coupled to the first rotating shaft 612, a driving wheel 64 linked with the lifting member 63, and a transmission member 66 linked with the driving wheel 64. The bottom of the base 61 is fixed integrally with the elevating plate 50. The lifting member 63 includes a strip 631, a first gear 633 arranged on one side of one end of the strip 631 in the transverse direction, and a strip hole 632 formed in one end of the strip 631, which is far away from the first gear 633, wherein the strip hole 632 is sleeved on the first rotating shaft 612 on the outer side of the base 61 in the transverse direction. The transmission wheel 64 includes a second rotation shaft 641, and two second and

third gears

643, 642 with different radii provided at one end of the second rotation shaft 641, wherein the second and

third gears

643, 642 and the second rotation shaft 641 are integrated, the radius of the second gear 643 is smaller than the radius of the third gear 642, and the second gear 643 is engaged with the first gear 633. The transmission member 66 includes a main body portion 661, first and second coupling ends 663, 664 formed at both ends of the main body portion 661, and a fourth gear 665 formed laterally outside the second coupling end 664. The main body portion 661 has an arc-shaped bent structure in conformity with the driving rod 42 of the hinge mechanism 40, and an arc-shaped space 662 in conformity with the arc-shaped space 422 of the driving rod 42 is formed inside the main body portion 661. The fourth gear 665 is in mesh with the third gear 642. The lifting mechanism 60 further includes a third shaft 65 passing through a shaft hole (not numbered) of the fourth gear 665 of the transmission member 66, and the third shaft 65 is further inserted into a shaft hole (not numbered) of the first gear 633 of the lifting member 63. A fourth rotating shaft 67 transversely penetrates through the first connecting end 664 of the transmission member 66, and the fourth rotating shaft 67 is fixed in the arc-shaped channel 144 of the limiting mechanism 14 of the first folding plate 11 and the second folding plate 12 and can rotate around the arc-shaped channel 144. The ends of the second rotating shaft 641 and the third rotating shaft 65 far from the base 61 are respectively fixed on a pair of second supporting walls 261 of the back cover 20. The lifting piece 63, the transmission wheel 64 and the transmission piece 66 are symmetrically arranged on two sides of the base 61.

The transmission member 66 spans two second avoiding grooves 263 which are relatively staggered between the second supporting walls 261 of the back cover 20.

Referring to fig. 6, 18 and 19, the lifting mechanism 60 operates according to the following principle:

when the first and

second folding plates

11, 12 are unfolded, the transmission member 66 rotates around the arc-shaped channel 144 of the limiting mechanism 14, the fourth gear 665 on the transmission member 66 drives the third gear 642 of the transmission wheel 64 to rotate, the second gear 643 integrated with the third gear 642 drives the first gear 633 of the lifting member 63 to rotate, the rotation of the first gear 633 enables the lifting member 63 to stand until the first rotating shaft 612 is located at the bottom of the strip-shaped hole 632, and the lifting member 63 continues to ascend and the base 61 ascends due to the continuous rotation, and finally the lifting plate 50 is driven to ascend, that is, the lifting plate 50 moves to ascend in a direction away from the back cover 20. When fully unfolded, the lifting plate 50 is raised to be flush with the first and

second folding plates

11, 12 to support the folding screen 80 in the unfolded state.

Conversely, when the first and

second folding plates

11, 12 are folded, the lifting plate 50 is lowered and moved toward the back cover 20 to avoid the folding area 82 of the folding screen 80 to prevent the folding screen 80 from being pressed.

The arc-shaped channel 144 on the limiting mechanism 14 controls the rotation path of the transmission member 66 to conform to the optimal folding path of the folding screen 80, and the lifting members 63, the transmission wheels 64 and the transmission member 66 are disposed at two longitudinal sides of the base 61, which are point-symmetric, so that the first and

second folding plates

11, 12 can be folded or unfolded at a uniform speed, that is, either side of the first and

second folding plates

11, 12 can be folded or unfolded at a certain angle, and the other side can also be folded or unfolded at the same angle by the lifting mechanism 60.

The lifting mechanism 60 of this application is still through the mode that sets up lifter plate 50, when folding, makes lifter plate 50 returns back lid 20 one side in order to dodge folding screen 80, and when expanding, lifter plate 50 rise to with first,

second folding plate

11, 12 parallel and level are in order to support folding screen 80, the problem of being destroyed easily by the weak change of the inside and outside cambered surface length that the folding in-process of expanding of folding screen 80 caused has been solved to the perfection.

As shown in fig. 17 to 19, after the foldable display device of the present application is folded, the space required by the folding or unfolding process is provided for the foldable screen 80 by the supplementary support and avoidance of the lifting plate 50. After the folding screen 80 is folded, the driving rod 42 of the hinge mechanism 40 and the driving member 66 of the lifting mechanism 60 form an arc-shaped space 662 at opposite inner sides thereof, so as to increase the space between the pair of driving rods 42 and the pair of driving members 66, and the folding screen is folded to be folded into a droplet-shaped structure 82 in the folding area between the driving rod 42 and the driving member 66, and the portions between the first and

second folding plates

11, 12 are completely attached to form the attaching portion 81. The setting of water droplet column structure 82 can increase the R angle of folding screen 80 reduces the technical degree of difficulty of folding screen 80, cooperates lifter plate 50 can accomplish when folding display device is folding completely, and the thickness of folding display device 80's back of the body lid 20 one side is unanimous with the open end, and the condition that one side is thick, one side is thin can not appear.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. 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 folding display device is characterized by comprising a first folding plate, a second folding plate, a back cover, a lifting plate, a hinge mechanism, a lifting mechanism and a folding screen, wherein the lifting plate, the hinge mechanism, the lifting mechanism and the folding screen are positioned between the first folding plate and the second folding plate, the back cover comprises a back cover cavity, two pairs of first supporting walls and two pairs of second supporting walls, the two pairs of first supporting walls are sequentially arranged in the back cover cavity, the two pairs of second supporting walls are positioned between the two pairs of first supporting walls, the hinge mechanism is accommodated between each pair of first supporting walls, the hinge mechanism comprises a sliding block, a transmission rod and a transmission component, the sliding block is respectively limited on the first folding plate and the second folding plate in a sliding mode, the transmission rod is rotatably hinged with one end of the sliding block, the transmission component is fixedly hinged with the transmission rod, the lifting mechanism comprises a base, lifting pieces, driving wheels and transmission pieces, the first rotating shafts are arranged at two longitudinal ends in a staggered mode, the lifting pieces are connected with the first rotating shafts, the driving wheels are linked with the lifting pieces, and the transmission pieces are linked with the driving wheels, articulated mechanism's transfer line with elevating system's driving medium all forms the arc in relative inboard and keeps away a position space with the arc, folding screen paste cover in first, second folded sheet deviate from back of the body lid one side, under fold condition, folding screen is in the arc keeps away position and arc and keeps away and fold into water droplet column structure in the space.

2. The foldable display device of claim 1, wherein the first and second cover sides of the back cover are respectively provided with a first avoiding groove between the first supporting walls, the transmission rod spans the first avoiding groove, the first avoiding groove provides a rotation space for the transmission rod, the cover side is provided with a second avoiding groove between the pair of second supporting walls in a staggered manner, and a pair of transmission members of the lifting mechanism spans the second avoiding groove to be rotatably hinged to the arc-shaped grooves of the first and second folding plates.

3. The foldable display device as claimed in claim 2, wherein the transmission assembly comprises a pair of first shafts, at least a pair of second shafts disposed between the first shafts, at least four gears sleeved on the first shafts and the second shafts and engaged with each other, and first and second clamping plates sleeved on the first and second shafts and disposed at two ends of the four gears, the transmission rod is fixedly hinged to the two first shafts disposed at the outer sides, the first shafts are fixed to the gears thereon and are not rotatable, the second shafts are rotatable relative to the gears thereon, and two ends of the first and second shafts are fixed to a pair of the first supporting walls.

4. The foldable display device as claimed in claim 3, wherein the first and second clamping plates are correspondingly provided with a plurality of shaft holes with the centers of circles in the same straight line, the first and second shaft bodies are sleeved in the shaft holes, the second shaft body is arranged between the two first shaft bodies side by side, and the transmission assembly further comprises a third clamping plate and a spring clamped between the second clamping plate and the third clamping plate.

5. The foldable display device according to claim 4, wherein the first and second foldable plates are provided with a sliding slot mechanism at a position corresponding to the sliding block, the sliding slot mechanism comprises two protrusions arranged side by side, a sliding slot disposed between the two protrusions, and a limiting slot disposed at the bottom of one side of the sliding slot of the protrusion, the sliding block is slidably limited in the sliding slot, the sliding block comprises a base portion, a limiting strip protruding from two lateral sides of the base portion and extending to form a limit in the limiting slot, and a hinge end disposed at one end of the base portion, and the hinge end is hinged to one end of the transmission rod.

6. The folding display device according to claim 1, wherein the lifting mechanism includes a base having a first rotation shaft at both longitudinal ends thereof, a lifting member coupled to the first rotation shaft, a transmission wheel coupled to the lifting member, and a transmission member coupled to the transmission wheel, a bottom surface of the base is fixed to the lifting plate, the lifting member includes a bar-shaped body, a first gear provided outside one end of the bar-shaped body, and a bar-shaped hole provided at the other end of the bar-shaped body and fitted over the first rotation shaft, the transmission wheel includes a second rotation shaft, a second gear provided at one end of the second rotation shaft and engaged with the first gear, and a third gear integrally formed with the second gear, the transmission member includes a main body, first and second coupling ends formed at both ends of the main body, and a fourth gear formed outside the second coupling end and engaged with the third gear, the lifting mechanism further comprises a third rotating shaft penetrating through the fourth gear and the first gear, and free ends of the second rotating shaft and the third rotating shaft at two longitudinal ends of the base are limited on the second supporting wall.

7. The foldable display device of claim 6, wherein the first and second folding plates are respectively provided with two limiting mechanisms corresponding to the two transmission members, each limiting mechanism is provided with an arc-shaped channel, the transmission members are rotatably hinged in the arc-shaped channels through a fourth rotating shaft, and the fourth rotating shaft can rotate in the arc-shaped channels.

8. The foldable display device of claim 7, wherein the slot of the lifting member has a length, and the first shaft is movable within the slot by a distance; when the transmission piece drives the transmission wheel to rotate, the transmission wheel drives the lifting piece to rotate, so that the lifting piece rotates around the first rotating shaft and stands upright relative to the horizontal plane to lift the base or enables the lifting piece to descend and rotate around the first rotating shaft to be in an inclined state with the horizontal plane until the base is put down.

9. The fold display apparatus of claim 8, wherein a radius of a second gear of the drive wheel is smaller than a radius of a third gear such that the first gear is concentric with a fourth gear and such that the second gear meshes with the first gear and the third gear meshes with the fourth gear.