CN107358874B

CN107358874B - Flexible display device

Info

Publication number: CN107358874B
Application number: CN201710527504.2A
Authority: CN
Inventors: 袁世鹏; 冯鹤冰; 何永新
Original assignee: Wuhan Tianma Microelectronics Co Ltd
Current assignee: Wuhan Tianma Microelectronics Co Ltd
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2020-02-11
Anticipated expiration: 2037-06-30
Also published as: CN107358874A

Abstract

The invention discloses a flexible display device which comprises a flexible display screen and a folding mechanism, wherein the folding mechanism comprises at least two supporting pieces and at least one connecting piece, each supporting piece is movably connected with the corresponding connecting piece, each supporting piece can rotate and move in a translation mode relative to the corresponding connecting piece, so that when two supporting surfaces of two adjacent supporting pieces are in a folded state, the two supporting pieces can move in a reverse mode to increase a gap between the two supporting surfaces, the bending radius of a bent part is increased, the time of cracks and bending marks of the bent part after the bent part is bent for a long time is prolonged, the service life of the bent part is prolonged, and the use stability of the flexible display screen is improved.

Description

Flexible display device

Technical Field

The invention relates to the technical field of display, in particular to a flexible display device.

Background

The flexible display screen has the characteristics of being bendable and foldable, so that the display device is lighter, thinner and more portable, and has been widely paid attention to and researched at present.

The flexible display screen can be accommodated in a folding manner, in the prior art, a structure of a folding flexible display device is shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of the flexible display device in an unfolded state, fig. 2 is a schematic structural diagram of the flexible display device in a folded state, and the flexible display device includes: the display device comprises a flexible display screen 10, two shells 20 and a connecting piece 30 which is rotatably connected with the two shells 20, wherein the flexible display screen is provided with two

plane parts

11 and 12 and a bending part 13. The flexible display screen 10 is folded or unfolded when the housing 20 is folded or unfolded. Referring specifically to fig. 1, when the two shells 20 rotate to be flat, the flexible display screen 10 can display, referring to fig. 2, when the two shells 20 rotate to be opposite, the flexible display screen 10 is in a folded state, in which the two

plane portions

11 and 12 are opposite, and the bending portion 13 is in a bent state.

Because the bent part of the flexible display screen at present has the limitation of service life, after the bending times of the flexible display screen reaches a certain number, the bent part can generate cracks and bending marks, so that the flexible display screen cannot continue normal display, and the use stability of the flexible display screen is reduced.

Disclosure of Invention

The embodiment of the invention aims to provide a flexible display device to solve the problem that the service stability of a flexible display screen is reduced due to the service life of a bent part of the flexible display screen.

In order to achieve the purpose, the invention provides the following technical scheme:

the flexible display screen comprises at least two plane parts and at least one bent part, and every two adjacent plane parts are connected through one bent part;

the folding mechanism comprises at least two supporting pieces and at least one connecting piece, each supporting piece is arranged corresponding to one flat part, each connecting piece is arranged corresponding to one bent part, and every two adjacent supporting pieces are connected through one connecting piece; each support part is provided with a support surface, and each support surface is fixedly connected with the back side of the corresponding plane part;

each supporting piece is movably connected with the corresponding connecting piece, and each supporting piece can rotate relative to the corresponding connecting piece so as to enable two supporting surfaces in two adjacent supporting pieces to be in an unfolding state and a folding state; when two supporting surfaces in two adjacent supporting parts are in the unfolded state, the two supporting surfaces are spliced together; when two supporting surfaces of two adjacent supporting pieces are in the folded state, the two supporting surfaces are opposite and form a gap for accommodating the corresponding bent part;

each support member is also movable in translation relative to the corresponding connecting member, so that when two support surfaces of two adjacent support members are in the folded state, the two support members move towards or away from each other.

The invention has the following beneficial effects:

in the flexible display device provided by the embodiment of the invention, the flexible display screen comprises at least two plane parts and at least one bending part; the folding mechanism comprises at least two supporting pieces and at least one connecting piece, each supporting piece is movably connected with the corresponding connecting piece, and each supporting piece can rotate and move in a translation mode relative to the corresponding connecting piece. When two supporting surfaces of two adjacent supporting parts are in a folded state, the two supporting surfaces are opposite to each other and form a gap for accommodating the bent part, and when each supporting part moves in a translation mode relative to the corresponding connecting part, the two supporting parts can move towards or away from each other so as to adjust the size of the gap between the two supporting surfaces. When two support piece moves mutually, the clearance increase between two holding surfaces to increased the bend radius of kink, great bend radius can delay the kink and produce the time of crackle and the vestige of buckling after buckling for a long time, and then increased the life of kink, improved flexible display screen's stability in use.

Drawings

Fig. 1 is a schematic structural diagram of a flexible display device in an unfolded state in the prior art;

FIG. 2 is a schematic view of the flexible display device shown in FIG. 1 in a folded state;

fig. 3 is an exploded view of a flexible display device according to an embodiment of the present invention;

FIG. 4 is a schematic view of the flexible display device shown in FIG. 3 in an unfolded state;

fig. 5 is a schematic view of the flexible display device shown in fig. 3 in a folded state;

FIG. 6 is a partial schematic view of the connector at one of the runners;

fig. 7 is a partial structural schematic view of the flexible display device shown in fig. 5;

fig. 8 is a partial structural schematic view of the flexible display device shown in fig. 4;

fig. 9 is an exploded view of another flexible display device according to an embodiment of the present invention;

FIG. 10 is a partial structural schematic view of the flexible display device of FIG. 9 in an unfolded state;

fig. 11 is a partial structural schematic view of the flexible display device of fig. 9 in a folded state;

fig. 12 is a schematic structural diagram of another flexible display device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

The problem that the bent portion 120 of the flexible display screen 100 in the prior art has a service life, and further the use stability of the flexible display screen 100 is reduced is solved. Referring to fig. 3 to 5, the present embodiment provides a flexible display device, fig. 3 is an exploded structure diagram of the flexible display device provided in the present embodiment, fig. 4 is an expanded state diagram of the flexible display device shown in fig. 3, and fig. 5 is a folded state diagram of the flexible display device shown in fig. 3, the flexible display device including:

referring to fig. 5, the flexible display panel 100 includes two planar portions 110 and a bent portion 120, and two adjacent planar portions 110 are connected by the bent portion 120;

a folding mechanism 200 including two supporting members 210 and a connecting member 220, as shown in fig. 5, each supporting member 210 is disposed corresponding to one of the planar portions 110, the connecting member 220 is disposed corresponding to the bent portion 120, and two adjacent supporting members 210 are connected by the connecting member 220; each support member 210 has a support surface 211, and each support surface 211 is fixedly coupled to the back side of the corresponding planar portion 110.

Each of the supporting members 210 is movably connected to a connecting member 220, and specifically, as shown in fig. 3, each of the connecting members 220 includes a bottom plate 221 and two connecting plates 222 connected to the bottom plate 221, and the two connecting plates 222 are oppositely disposed and respectively located at two ends of the bottom plate 221. Each connecting plate 222 in the connecting member 220 is provided with two sliding grooves 2221; one end of each support member 210 is provided with two rotating shafts 212, two ends of each support member 210, which are close to each other, are located between two connecting plates 222 of the connecting member 220, each rotating shaft 212 is connected with one sliding slot 2221 in a matching manner, and each rotating shaft 212 can rotate, slide or rotate and slide in the corresponding sliding slot 2221 at the same time.

When each of the supporting members 210 rotates with respect to the link member 220, two supporting surfaces 211 of the two supporting members 210 may be in an unfolded state and a folded state. Specifically, as shown in fig. 4, when the two supporting surfaces 211 are in the unfolded state, the two supporting surfaces 211 are spliced together, specifically, in this embodiment, when the two supporting surfaces 211 are in the unfolded state, the two supporting surfaces 211 are not parallel, and an included angle between the two supporting surfaces 211 is opened to a degree that the flexible display screen 100 can be viewed or touched. It should be noted that, when the two supporting surfaces 211 are spliced together, the two supporting surfaces 211 may be connected to form a continuous plane, or the two supporting surfaces 211 may be disconnected from each other and discontinuous; referring specifically to fig. 4, the angle between the two supporting surfaces 211 in this embodiment is at the maximum, so that the supporting surfaces 211 are opened to 180 °, that is, the two supporting surfaces 211 are in the same plane;

referring to fig. 5, when two supporting surfaces 211 of the two supporting members 210 are in a folded state, the two supporting surfaces 211 are opposite to each other and form a gap for accommodating the bent portion 120. Specifically, when the two supporting surfaces 211 are in the folded state, the two supporting surfaces 211 may be parallel or not, and the gap between the two supporting surfaces 211 and the position of the bending portion 120 of the flexible display 100 should be greater than or equal to twice the minimum bending radius of the flexible display 100, so as to prevent the flexible display 100 from being damaged when the bending radius of the flexible display 100 is smaller than the minimum bending radius.

When the bent portion 120 of the flexible display 100 is in the bent state, the smaller the bending radius thereof, the larger the amount of deformation of the light emitting device in the bent portion 120. The bending part 120 of the flexible display 100 has a limitation on the number of times of bending, and after the number of times of bending exceeds the limitation number of times, the light emitting device inside the bending part 120 may generate cracks or bending traces due to bending fatigue. In each bending process, when the bending radius of the bending portion 120 is smaller, which results in an increase in the deformation of the light emitting device, the process of generating cracks or bending marks on the light emitting device is further accelerated, and the bending times of the bending portion 120 are reduced, thereby resulting in a reduction in the service life of the flexible display 100.

To improve the above problem, referring to fig. 5, when the two supporting surfaces 211 are folded, each rotating shaft 212 can slide in the corresponding sliding slot 2221, so that each supporting member 210 can move in a translational manner relative to the connecting member 220, and thus the two supporting members 210 can move toward or away from each other, thereby changing the size of the gap between the two supporting surfaces 211. When the two supporting members 210 move back to back along the two arrow directions shown in fig. 5, the gap between the two supporting surfaces 211 is increased, and then the two ends of the bending portion 120 are driven to move back to back, so that the bending radius of the bending portion 120 is increased, the time for the bending portion 120 to generate cracks and bending traces after being bent for a long time can be delayed by the larger bending radius, the service life of the bending portion 120 is further prolonged, and the use stability of the flexible display screen 100 is improved.

Specifically, to ensure that the two supporting surfaces 211 can move toward or away from each other when the two supporting surfaces 211 are in the folded state, the extending direction of each sliding slot 2221 cannot be parallel to the corresponding supporting surface 211, that is, the included angle between the extending direction of each sliding slot 2221 and the corresponding supporting surface 211 is greater than 0 °, so as to ensure that the distance between the two supporting surfaces 211 can be changed when the rotating shaft 212 slides in the corresponding sliding slot 2221. In one embodiment, referring to fig. 5, each sliding slot 2221 extends in a direction parallel to the bottom plate 221 of the connecting member 220, and the distance between the two supporting members 210 and the connecting member 220 in a direction perpendicular to the bottom plate 221 of the connecting member 220 is constant during the process of sliding the rotating shaft 212 in the corresponding sliding slot 2221.

In order to improve the rotational stability of the rotating shaft 212 and the sliding adjustment precision of the rotating shaft 212 during the sliding or rotating process of each rotating shaft 212 in the corresponding sliding slot 2221, referring to fig. 6, fig. 6 is a partial schematic view of the connecting member 220 at one sliding slot 2221, the sliding slot 2221 has two sets of engaging mechanisms 2222, and each set of engaging mechanisms 2222 includes two grooves which are located on two inner walls of the sliding slot 2221 and are opposite to each other; the rotating shaft 212 corresponding to each sliding slot 2221 can be engaged with the two

grooves

22221, 22222 of each set of engaging mechanisms 2222 when sliding in the sliding slot 2221 in the direction indicated by the arrow in fig. 6, and can rotate in the two

grooves

22221, 22222 of each set of engaging mechanisms 2222. When the rotating shaft 212 is engaged with the two

grooves

22221, 22222 of the engaging mechanism 2222, the rotating shaft 212 can slide in the sliding slot 2221 only when the force along the extending direction of the sliding slot 2221 exceeds the engaging force of the two

grooves

22221, 22222, thereby ensuring the rotational stability of the rotating shaft 212. When the number of the engaging mechanisms 2222 in the sliding groove 2221 exceeds one set, the minimum distance between the adjacent two engaging mechanisms 2222 for the sliding of the rotating shaft 212 in the sliding groove 2221 can improve the adjustment accuracy of the sliding movement of the rotating shaft 212 in the sliding groove 2221, and further improve the adjustment accuracy of the gap between the two supporting surfaces 211. In a specific implementation, at least one set of engaging mechanisms 2222 is provided in each slot 2221.

When the two supporting surfaces 211 are in the unfolded state, if the flexible display panel needs to be touch-controlled, the back side of the bending portion 120 of the flexible display panel needs to be supported, so as to avoid the problem that the bending portion 120 collapses to affect the operation when the bending portion 120 is pressed. In one embodiment, referring to fig. 4, each of the supporting members 210 has a supporting surface 211, each supporting surface 211 includes a first supporting portion 2111 and a second supporting portion 2112, the first supporting portion 2111 is fixedly connected to the back side of the corresponding planar portion 110, each second supporting portion 2112 is arranged corresponding to the bending portion 120 and located between the two connecting plates 222 of the connecting member 220, and when the two supporting surfaces 211 of the two supporting members 210 are in the unfolded state, the second supporting portions 2112 of the two supporting surfaces 211 are spliced together to support the bending portion 120 of the flexible display panel 100.

In order to improve the stability of each supporting member 210 in the rotating process relative to the connecting member 220, referring to fig. 4 and 5, in the two supporting members 210, the end surface 213 of each supporting member 210 between the two connecting plates 222 is an arc surface, the axis of each arc surface coincides with the rotation axis of the supporting member 210 on which the arc surface is located, and in the rotating process of the two supporting members 210 relative to the corresponding connecting member 220, each end surface 213 is tangent to one side of the bottom plate 221 of the connecting member 220 facing the corresponding bent portion 120, so that in the rotating process of each supporting member 210, the end surface 213 can play a role in supporting the supporting member 210, and the stability of the rotation of the supporting member 210 is improved.

In order to further reduce the volume of the flexible display device when the two supporting surfaces 211 are in the folded state, in a specific manner, referring to fig. 7, fig. 7 is a partial structural schematic view of the flexible display device shown in fig. 5, in the two supporting members 210, a central angle α subtended by a portion of each end surface 213 tangent to the bottom plate 221 of the corresponding connecting member 220 during rotation of the corresponding supporting member 210 is greater than 90 °, and then, referring to fig. 5, when the two supporting surfaces 211 are in the folded state, both ends of the two supporting surfaces 211 away from the respective rotational axis 212 line abut against each other, thereby further reducing the volume of the flexible display device, in other embodiments, when a central angle α subtended by a portion of each end surface 213 tangent to the bottom plate 221 of the corresponding connecting member 220 during rotation of the corresponding supporting member 210 is equal to 90 °, then when the two supporting surfaces 211 are in the folded state, the two supporting surfaces 211 are parallel.

Further, in order to ensure that the relative position between the two supporting members 210 is fixed when the two supporting surfaces 211 are in the unfolded state, and to improve the operation stability of the flexible display device, referring to fig. 4, when the two supporting surfaces 211 are in the unfolded state, the two end surfaces 213 of the two supporting members 210 are tangent, and since the flexible display screen 100 is flattened at this time, the distance between the two supporting members 210 cannot be adjusted, and the relative position between the two supporting members 210 is ensured to be fixed.

Referring to fig. 8, fig. 8 is a partial structural schematic view of the flexible display device shown in fig. 4, in the two supporting members 210 shown in fig. 7, when a central angle α subtended by a portion of each end surface 213 tangent to the bottom plate 221 of the corresponding connecting member 220 during the rotation of the corresponding supporting member 210 is greater than 90 °, when the two supporting surfaces 211 are in the unfolded state as shown in fig. 8, a gap is formed between the two supporting surfaces 211, and a geometric relationship between a size S of the gap and a distance d from the center of the rotating shaft 212 to the back side of the flexible display screen 100 and a radius r of the end surface 213 satisfies the following formula:

according to the above formula, the smaller the distance d from the center of the rotating shaft 212 to the back side of the flexible display screen 100, the smaller the size S of the gap, and in order to solve the problem that the operation of the flexible display screen 100 at the gap is inconvenient due to the overlarge gap between the two supporting surfaces 211, the distance d from the center of the rotating shaft 212 to the back side of the flexible display screen 100 needs to be reduced to reduce the size of the gap between the two supporting surfaces 211. Optionally, the distance between the rotation axis 212 and the back side of the flexible display 100 is the smallest, which is the radius of the rotation axis 212. In one embodiment, the outer perimeter of each axis of rotation 212 is tangent to the back side of the corresponding planar segment 110. Alternatively, as the radius of the rotation shaft 212 decreases, the gap between the two support surfaces 211 may be at least 1 mm.

Referring to fig. 7, the bending radius R of the bent portion 120, the distance D between the rotational axis 212 line of each support 210 and the back side of the corresponding planar portion 110, and the distance D between the rotational axes 212 lines of the two supports 210 when the two support surfaces 211 are in the folded state satisfy the following formula:

R+d>D/2。

further, in order to prevent the bending radius of the bending part 120 of the flexible display 100 from being smaller than the minimum bending radius when the two supporting surfaces 211 are in the folded state, and thus causing damage to the bending part 120, in one embodiment, in the two supporting members 210, a distance between two rotation axes 212 of the two supporting members 210 satisfies the following formula:

r+d>D/2；

where r is the minimum bend radius of the bend 120; d is the distance between the axis of rotation 212 of each support 210 and the back side of the corresponding planar portion 110; d is the distance between the two rotational axes of the two supports 210. When the distance D between the two rotation axes 212 of the two supporting members 210 satisfies the above formula, the actual bending radius of the bent portion 120 is larger than the minimum bending radius r, so that the bent portion 120 is prevented from being excessively bent and damaged.

In order to avoid the position interference between the supporting members 210 and the connecting member 220 during the rotation process to affect the rotation thereof, referring to FIG. 7, in one embodiment, the distance between the rotation axis 212 of each supporting member 210 and the corresponding bottom plate 221 in the two supporting members 210 is greater than or equal to one half of the distance between the two rotation axes 212 of the two supporting members 210, i.e., the distance H ≧ D/2 in FIG. 7.

In order to prevent the two supporting surfaces 211 from being excessively unfolded when the two supporting surfaces 211 are in the unfolded state, and further to prevent the viewing or the operation of the flexible display screen 100 from being affected, as shown in fig. 4, 5, 7, and 8, in an alternative embodiment, in the two supporting members 210, each supporting member 210 is provided with a limiting protrusion 214 on a side away from the corresponding planar portion 110, as shown in fig. 4 and 8, when the two supporting surfaces 211 are in the unfolded state, the two limiting protrusions 214 respectively abut against two sides of the bottom plate 221 in the arrangement direction of the two supporting members 210, so as to prevent each supporting member 210 from further rotating.

In summary, it can be seen that in the flexible display device provided in the present embodiment, when two supporting surfaces 211 of two adjacent supporting members 210 are in the folded state, the two supporting surfaces 211 are opposite to each other and form a gap for accommodating the bending portion 120, and when each supporting member 210 moves in a translational manner relative to the corresponding connecting member 220, the two supporting members 210 can move toward or away from each other to adjust the size of the gap between the two supporting surfaces 211. When the two supporting members 210 move away from each other, the gap between the two supporting surfaces 211 is increased, so that the bending radius of the bending portion 120 is increased, the time for the bending portion 120 to generate cracks and bending traces after being bent for a long time can be delayed due to the larger bending radius, the service life of the bending portion 120 is prolonged, and the use stability of the flexible display screen 100 is improved.

Based on the same inventive concept, the present embodiment provides a flexible display device, as shown in fig. 9, fig. 9 is an exploded schematic view of another flexible display device provided in the present embodiment, and includes a flexible display screen 100, two supporting members 210, and connecting members 220, each connecting member 220 includes a bottom plate 221 and two connecting plates 222 connected to the bottom plate 221, and the two connecting plates 222 are disposed opposite to each other and located at two ends of the bottom plate 221 respectively.

The flexible display device provided in this embodiment is different from the flexible display device provided in the previous embodiment in that two rotating shafts 2223 are provided on each connecting plate 222 in the connecting member 220, one end of each supporting member 210 is provided with two sliding slots 213, each sliding slot 213 can rotate with the supporting member 210 on which it is provided, and each rotating shaft 2223 can rotate, slide or rotate and slide in the corresponding sliding slot 213 at the same time.

Referring to fig. 10 and 11, fig. 10 is a partial structural diagram of an unfolded state of the flexible display device of fig. 9, and fig. 11 is a partial structural diagram of a folded state of the flexible display device of fig. 9, in this embodiment, when the two supporting surfaces 211 are in the unfolded state, an angle between an extending direction of the sliding groove 213 on the supporting member 210 and the bottom plate 221 of the connecting member 210 is less than 90 °, and when the two supporting surfaces 211 are in the folded state, the sliding groove 213 on the supporting member 210 rotates along with the supporting member 210, and the extending direction thereof is parallel to the bottom plate 221 of the connecting member 220, so that a gap between the two supporting surfaces 211 can be adjusted.

In the flexible display device that this embodiment provided, the clearance between two holding surfaces is adjustable big to increased the bend radius of kink, great bend radius can delay the kink and produce the time of crackle and the vestige of buckling after buckling for a long time, and then increased the life of kink, improved flexible display screen's stability in use. The structure and the specific implementation are referred to the above embodiments, and are not described again.

Based on the same inventive concept, the present embodiment provides a flexible display device, as shown in fig. 12, fig. 12 is a schematic structural diagram of another flexible display device provided in the present embodiment, and includes three supporting members 210 and two connecting members 220, each two adjacent supporting members 210 are movably connected by one connecting member 220, so that a flexible display screen in the flexible display device includes three planar portions and two bending portions, each supporting member 210 is disposed corresponding to one planar portion, and each connecting member 220 is disposed corresponding to one bending portion. The flexible display device has more foldable parts so as to adapt to the flexible display screen with larger area and more foldable parts.

It can be understood that, in addition to the flexible display device with the structure shown in fig. 12, the flexible display device provided in this embodiment may further include more than three supporting members and more than two connecting members, and then the corresponding flexible display screen includes more than three planar portions and more than two bending portions, so as to implement multiple folding of the flexible display screen.

In the flexible display device that this embodiment provided, in two adjacent support piece, the clearance between two holding surfaces is adjustable big to increased the bend radius of kink, great bend radius can delay the kink and produce the time of crackle and the vestige of buckling after buckling for a long time, and then increased the life of kink, improved flexible display screen's stability in use. The structure and the specific implementation are referred to the first embodiment, and are not described again.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A flexible display device, comprising:

each supporting piece can also move in a translation mode relative to the corresponding connecting piece, so that when two supporting faces of two adjacent supporting pieces are in the folded state, the two supporting pieces move towards or away from each other;

in the supporting pieces and the connecting pieces which are correspondingly arranged, each connecting piece is provided with at least one sliding chute, each supporting piece is provided with at least one rotating shaft, or each connecting piece is provided with at least one rotating shaft, and each supporting piece is provided with at least one sliding chute;

when two supporting surfaces of two adjacent supporting pieces are in the folded state, the included angle between the extending direction of each sliding groove and the corresponding supporting surface is larger than 0 degree;

each rotating shaft is correspondingly matched and connected with one sliding groove, and each rotating shaft can rotate and/or slide in the corresponding sliding groove.

2. The flexible display device according to claim 1, wherein each sliding slot has at least one set of engaging means, each set of engaging means comprising two grooves located on two inner walls of the sliding slot and disposed opposite to each other;

when the rotating shaft corresponding to each sliding groove slides in the sliding groove, the rotating shaft can be clamped and connected with the two grooves of each group of clamping mechanisms and can rotate in the two grooves of each group of clamping mechanisms.

3. The flexible display device according to claim 2, wherein each connecting member comprises a base plate and two connecting plates connected to the base plate, the two connecting plates being disposed opposite to each other and located at both ends of the base plate, respectively; in each two adjacent supporting pieces, two ends, close to each other, of the two supporting pieces are positioned between the two connecting plates of the corresponding connecting piece and movably connected with the two connecting plates;

in the supporting piece and the connecting piece which are correspondingly arranged, each connecting plate in the connecting piece is provided with two sliding chutes, and the extending direction of each sliding chute is parallel to the bottom plate of the connecting piece; one end of each supporting piece is provided with two rotating shafts, and each rotating shaft is connected with one sliding chute in a matching way; or, be equipped with two pivots on every connecting plate in the connecting piece, every support piece's one end is equipped with two spouts, and two holding surfaces in two adjacent support pieces are in during fold condition, the extending direction of every spout with the bottom plate of connecting piece is parallel, and every pivot is connected with a spout cooperation.

4. A flexible display device as claimed in claim 3, wherein each support member has a support surface, each support surface comprising a first support portion and at least one second support portion; each first supporting part is fixedly connected with the back side of the corresponding plane part, and each second supporting part is correspondingly arranged with one bending part connected with the corresponding plane part and positioned between the two connecting plates of the corresponding connecting piece;

when two supporting surfaces of two adjacent supporting pieces are in the unfolded state, the second supporting parts of the two supporting surfaces are spliced together.

5. The flexible display device according to claim 3, wherein in each adjacent two of the supporting members, an end surface of each supporting member located between the two connecting plates is a curved surface, a shaft axis of each curved surface coincides with the rotation axis of the corresponding supporting member, and each end surface is tangent to a side of the bottom plate of the connecting member facing the corresponding bending portion during rotation of the two supporting members with respect to the corresponding connecting member, respectively.

6. A flexible display device as claimed in claim 5, wherein in each two adjacent supports, the portion of each end surface which is tangent to the base plate of the corresponding connector during rotation of the corresponding support subtends an angle of greater than 90 ° and the two ends of the two support surfaces remote from the respective axes of rotation abut each other when the two support surfaces are in the folded condition.

7. A flexible display device as claimed in claim 6, wherein in each two adjacent supports the two end faces are tangent when the two support faces are in the unfolded state.

8. The flexible display device of claim 7, wherein an outer perimeter of each pivot axis is tangent to a back side of the corresponding planar portion.

9. The flexible display device according to claim 5, wherein in each adjacent two of the support members, a distance between two rotation axes of the two support members satisfies the following formula:

R+d>D/2；

wherein R is a bending radius of the bent portion when the two support surfaces are in the folded state; the d is a distance between the rotational axis of each support and the back side of the corresponding planar portion; d is the distance between the two axes of rotation of the two supports.

10. The flexible display device according to claim 5, wherein in each adjacent two of the support members, a distance between two rotation axes of the two support members satisfies the following formula:

r+d>D/2；

wherein r is the minimum bending radius of the bending part; the d is a distance between the rotational axis of each support and the back side of the corresponding planar portion; d is the distance between the two axes of rotation of the two supports.

11. A flexible display device as claimed in claim 5, wherein in each two adjacent supports the distance between the axis of rotation of each support and the corresponding bottom plate is greater than or equal to half the distance between the two axes of rotation of the two supports.

12. The flexible display device according to claim 5, wherein in each of two adjacent support members, each support member is provided with a stopper protrusion on a side away from the corresponding planar portion, and when the two support surfaces are in the unfolded state, the two stopper protrusions abut against both sides of the bottom plate in the arrangement direction of the two support members, respectively.