WO2021190062A1

WO2021190062A1 - Display device

Info

Publication number: WO2021190062A1
Application number: PCT/CN2020/142148
Authority: WO
Inventors: 赵振宇; 唐泽达; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-03-23
Filing date: 2020-12-31
Publication date: 2021-09-30
Also published as: CN212151189U

Abstract

A display device, comprising: a screen body (1); a scroll body (2), which is used for rolling/unrolling the screen body (1); a lifting part, which is connected to the scroll body (2) by means of the screen body (1) so that the screen body (1) is unrolled from the scroll body (2); and a power part, which is used to provide power to enable the scroll body (2) to roll up the screen body (1). A difference in rotating speed exists between the lifting part and the power part such that the screen body (1) generates tension in a rolling/unrolling process; when the screen body (1) is unrolled, the rotating speed of the lifting part is greater than that of the power part; and when the screen body (1) is rolled up, the rotating speed of the power part is greater than that of the lifting part. The power part comprises a driving part (3) and a tension control part (4). The tension control part (4) can actively control the torque between the driving part (3) and the scroll body (2) according to differences in the tension of the screen body (1) during rolling/unrolling, thus stable and controllable rolling/unrolling of the screen body (1) is achieved, and the service life of the display device can be prolonged.

Description

A display device

Technical field

This application relates to the technical field of display devices, and in particular to a display device.

Background technique

The lifting screen is a product that takes advantage of the flexibility of the flexible screen and uses a certain mechanical device to enable the screen to be unfolded or rolled as needed. It has the characteristics of beautiful appearance and small space occupation. Since the general lifting screen needs to be lifted, it is of great significance for the product to ensure that the screen has a proper tension and maintains a certain stability when it is unfolded.

The inventor of the present application has discovered through long-term research and development that most of the common flexible screens on the market currently have a passive tension design, that is, a spring (torsion spring or coil spring) is used to provide tension. This kind of lifting screen may have large tension fluctuations during the unwinding/rewinding process, which has an adverse effect on the actual effect and the structural life.

Utility model content

The main technical problem to be solved by this application is to provide a display device, which can make the tensioning force of the screen body stable and controllable during winding/unfolding, and improve the service life of the display device.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a display device, the display device includes: a screen body, a reel body, used for winding/unwinding the screen body; a lifting part, which passes through the screen Connected with the reel body for unwinding the screen body from the reel body; a power part connected with the reel body to provide power for the reel body to rewind the screen The body; the lifting part and the power part have a rotational speed difference, so that the screen body generates tension during the winding/unwinding process to maintain the flatness of the screen; during the unwinding process of the screen body, The rotation speed of the lifting part is greater than the rotation speed of the power part, and during the winding process of the screen body, the rotation speed of the power part is greater than the rotation speed of the lifting part.

Wherein, the power part includes a driving part and a tension control part, the driving part is connected to the reel body through the tension control part to drive the reel body to rewind the screen body, and the tension control part is used for Actively control the torque between the driving part and the reel body, so as to realize the smooth winding/unwinding of the screen body.

Wherein, the tension control unit generates torque between the driving unit and the reel body by means of friction.

Wherein, the end of the reel body is provided with a friction plate, and the tension control part includes: a shaft core connected to a driving part; a first pressing piece and a second pressing piece are arranged on the shaft core at intervals along the axial direction of the shaft core;

The friction plate is located between the first pressing piece and the second pressing piece.

Wherein, the shaft core, the first pressing piece and the second pressing piece are coaxially arranged.

Wherein, the tension control part further includes a compression nut, the compression nut is located on one side of the first compression piece, and is used to adjust the compression force between the first compression piece and the second compression piece and the friction plate.

Wherein, the shape of the first pressing piece and the second pressing piece are the same.

Among them, the tension control unit electromagnetically generates torque between the drive unit and the reel body.

Among them, the tension control unit generates torque between the drive unit and the reel body by means of magnetic powder.

Wherein, the power part includes a first power part and a second power part, the power part includes a first power part and a second power part, and the first power part includes a first driving part and a first tension control part, The first driving part is connected to the first tension control part and is located at the first end of the reel body, the second power part includes a second driving part and a second tension control part, the second driving part It is connected to the second tension control part and is located at the second end of the reel body.

Wherein, the display device further includes a support, and the reel body is fixed on the support and can rotate around the central axis of the reel body.

The beneficial effect of the embodiments of the present application is that different from the prior art, in the display device of the present application, the lifting part and the power part have a rotational speed difference, so that the screen body is in the winding/unwinding process. In the process of unwinding the screen body, the rotating speed of the lifting part is greater than the rotating speed of the power part, and during the unwinding process of the screen body, the power part At the same time, the tension control part is connected to the reel body and the driving part to actively control the torque between the driving part and the reel body, so that the tension force is stable and controllable when the screen body is rewinding/unfolding , When the screen body is in a static state, it can have better holding power; in addition, the tension force of the screen body can be easily adjusted and has better adaptability.

Description of the drawings

FIG. 1 is a schematic structural diagram of an embodiment of a display device provided by the present application;

Figure 2 is a partial enlarged view of box A in Figure 1;

3 is a schematic structural diagram of a first embodiment of a tension control part in a display device provided by the present application;

Figure 4 is a cross-sectional view of the tension control part in Figure 3;

5 is a schematic structural diagram of a second embodiment of the tension control part in the display device provided by the present application;

FIG. 6 is a schematic structural diagram of a third embodiment of the tension control part in the display device provided by the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

At present, most of the lifting screens on the market are mainly passive scrolls, which are mainly suitable for screens with higher material flexibility. Passive tensioning design generally uses springs to provide tensioning force. Since the spring tension is proportional to the amount of deformation, the tensioning force on the screen when the passive lifting screen moves to different positions during the unwinding/rewinding process is not the same. Ensure the smoothness of the screen unwinding/winding process; and the screen may have large tension fluctuations during the unwinding/winding process, which will adversely affect the life of the screen.

In order to keep the force of the screen during the unwinding/rewinding process controllable and stable, this application proposes a display device that uses an actively controlled reel to control the screen tension, which can be suitable for harder materials and greater tension. Screen.

As shown in FIGS. 1 and 2, FIG. 1 is a schematic structural diagram of an embodiment of a display device provided by the present application, and FIG. 2 is a partial enlarged view of frame A in FIG. 1. The display device includes: a screen body 1, a scroll body 2 , Lifting part (not shown in the figure), power part (not shown in the figure).

The screen body 1 is a screen body with a display function. In order to realize the winding and unwinding of the screen body 1, the screen body 1 is a flexible structure. One end of the screen body 1 is fixed on the reel body 2, and the reel body 2 is used for winding/unwinding the screen body 1. Optionally, the display device further includes a support 7 on which the reel body 2 is fixed. Preferably, the reel body 2 can be fixed by the supports 7 at both ends, and can be rotated around the central axis of the reel body 2 to realize the winding/unwinding of the screen body 1.

The lifting part is connected to the screen body 1, and the lifting part can control the screen body 1 to unwind from the reel body 2, and the force of the lifting part is converted into the torque of the reel body 2 through the tension of the screen body 1. Since the speed at which the lifting part drives the scroll body to rotate is not uniform, the tension on the screen body 1 is not uniform. In order to allow the screen body 1 to receive a smooth and uniform tension during rewinding/unwinding, and to achieve uniform rewinding or unwinding, the display device of this embodiment also includes a power unit (not shown in the figure) out).

The power part is connected to the reel body to provide power for the reel body to wind up the screen body 1, and the power part and the lifting part have a rotational speed difference, so that the screen body is During the winding/unwinding process, tension is generated to maintain the flatness of the screen; during the unwinding process of the screen body, the rotation speed of the lifting part is greater than the rotation speed of the power part, and during the winding process of the screen body Wherein, the rotation speed of the power part is greater than the rotation speed of the lifting part.

Specifically, the power part includes a driving part 3 and a tension control part 4, wherein the driving part 3 is connected to the reel body 2 through the tension control part 4 to drive the reel body 2 to rewind the screen The main body, the tension control part 4 is used to actively control the torque between the driving part 3 and the reel body 2 to control the tension of the screen body 1 so as to realize the smooth winding/unwinding of the screen body 1.

In this embodiment, since the speed of the screen body 1 being unfolded under the driving of the lifting part is not uniform, and the rotation speed of the power part is generally constant, therefore, the driving part 3 of the power part is connected with the reel driven by the lifting part. There will be a difference in rotation speed between the bodies 2. The tension control part 4 is designed to actively control the generation of a constant torque to the reel body 2 when the driving part 3 and the lifting part produce a rotation speed difference, so that the screen body 1 The tension force is stable, and the service life of the display device is improved. In addition, the tension control unit 4 can also prevent the drive unit 3 from being blocked, so as to reduce damage to the drive unit 3.

Specifically, the driving part 3 may include a motor and an output shaft. The motor may be directly connected to the output shaft, or may be connected through a coupling or other transmission mechanism. The output shaft is connected to the tension control part 4, so that the spool body 2 can be adjusted to the reel body 2 through the tension control part 4. A constant torque is generated, so that the torque between the driving part 3 and the reel body 2 is controllable. In other embodiments, the driving part 3 may also be driven by gears, conveyor belts and other transmission devices to transmit power from an external power mechanism.

In this embodiment, the tension control part 4 can actively control the torque between the driving part 3 and the reel body 2 by means of friction according to the difference in tension of the screen body 1 during the winding/unwinding process. Torque control through friction is low cost, simple and convenient, and does not require additional current input. Referring again to FIGS. 3 and 4, FIG. 3 is a schematic structural diagram of a first embodiment of the tension control unit 4 in the display device provided by the present application, and FIG. 4 is a cross-sectional view of the tension control unit 4 in FIG. The part 4 includes: a shaft core 41, a first pressing piece 42 and a second pressing piece 43.

Specifically, the shaft core 41 is connected to the output shaft (not shown in the figure) of the driving part 3, and the shaft core 41 can rotate under the driving of the output shaft of the driving part 3. The first pressing piece 42 and the second pressing piece 43 are arranged on the shaft core 41 at intervals along the axial direction of the shaft core 41. The reel body 2 is provided with a friction plate 21, the friction plate 21 is located at the end of the reel body 2, and the friction plate 21 is located between the first pressing piece 42 and the second pressing piece 43. The first pressing piece 42 and the second pressing piece 43 are used to clamp the friction plate 21 from both sides. In order to make the force of the friction plate 21 more uniform, the shaft core 41, the first pressing piece 42 and the second pressing piece 43 may be coaxially arranged.

The driving part 3 of the power part can drive the first pressing piece 42 and the second pressing piece 43 on the shaft core 41 to rotate at a first speed. The lifting part makes the reel body 2 rotate at a second speed. When the first rotation speed is different from the second rotation speed, that is, when there is a rotation speed difference between the first pressing piece 42 and the second pressing piece 43 and the friction plate 21, the first pressing piece 42 and the second pressing piece 43 are different from each other. A sliding friction force is generated between the friction plates 21, and the sliding friction force can generate a torque to the reel body, thereby achieving an effect of actively controlling the tension of the screen body 1. That is to say, the sliding friction force can be actively controlled according to the tension of the screen body 1 when winding/unwinding, so that the torque between the driving part 3 and the reel body 2 is controllable, so that the screen body 1 can be wound/unwinded smoothly. roll.

The magnitude of this sliding friction determines the magnitude of the torque received by the reel body 2. Since the sliding friction force is constant during the winding/unwinding process of the screen body 1, the torque received by the reel body 2 is constant, so that the tension force of the screen body 1 is stable and uniform.

The magnitude of the sliding friction force depends on the pressing force between the first pressing piece 42 and the second pressing piece 43 and the friction plate 21 and the friction coefficient between their contact surfaces, and has nothing to do with the rotation speed. Therefore, the torque to the reel body 2 can be controlled by adjusting the pressing force between the first pressing piece 42 and the second pressing piece 43 and the friction plate 21 or adjusting the friction coefficient between their contact surfaces to control the screen The tension of the body 1.

Optionally, the compression force between the first compression piece 42 and the second compression piece 43 and the friction plate 21 can be adjusted by the compression nut 44. A compression nut 44 is provided on one side of the first compression piece 42, and the compression force between the first compression piece 42 and the second compression piece 43 and the friction plate 21 is adjusted by adjusting the compression nut 44. Among them, two compression nuts 44 can be provided, and they are symmetrically arranged along the shaft core 41 to make the compression force distribution more uniform. In other embodiments, the number of compression nuts 44 can be selected according to actual conditions.

In this embodiment, the pressing force between the first pressing piece 42 and the second pressing piece 43 and the friction plate 21 can be easily adjusted by the pressing nut 44 to adjust the sliding friction force, thereby controlling the screen The tension of the body 1.

In other embodiments, materials with different friction coefficients may be attached to the contact surfaces of the first pressing piece 42 and the second pressing piece 43 with the friction plate 21 to change the first pressing piece 42 and the second pressing piece 43. The coefficient of friction with the friction plate 21 changes the magnitude of the sliding friction force to control the tension of the screen body 1.

Optionally, the first pressing piece 42 and the second pressing piece 43 may be respectively arranged around the shaft core 41, and the shape of the first pressing piece 42 and the shape of the second pressing piece 43 may be the same to allow sliding The force of the friction plate 21 is more uniform. In other embodiments, the shape of the first pressing piece 42 and the second pressing piece 43 may also be different.

The working principle of this embodiment is that one end of the screen body 1 is fixed on the reel body 2 and can be wound on the reel body 2. During the unwinding process of the screen body, the rotation speed of the lifting part is greater than the rotation speed of the power part, and during the winding process of the screen body, the rotation speed of the power part is greater than the rotation speed of the lifting part.

Specifically, when the screen body 1 is to be unrolled, the screen body 1 is driven by the lifting part to expand outward, and the reel body 2 is driven by the screen body 1 to rotate accordingly. The driving part 3 that controls the power part rotates at a lower speed than the reel body 2. Optionally, the driving part 3 may also be non-rotating or reverse rotation, so that there is a difference in speed between the driving part 3 and the reel body 2. Due to the difference in rotational speed between the two sides of the tension control part 4, the reel body 2 can only be rotated by overcoming the preset torque. The magnitude of the preset torque depends on the first pressing piece 42 and the second pressing piece 43 and the friction plate 21. Because the sliding friction force is constant, the preset torque is also constant. That is, during the unfolding process of the screen body 1, the tension control part 4 can be actively controlled to make the tension force of the screen body 1 stable and controllable , Can improve the life of the display device. After unfolding to a fixed position, since the position of the reel body 2 is fixed, the reel body 2 can only be rotated unless the external force overcomes the preset torque. Therefore, the screen body 1 also has a good holding force in a static state, which can reduce the vibration phenomenon Occurs, which can improve the display effect of the display device.

When the screen body 1 needs to be rewinded, the output shaft of the driving part 3 that controls the power part is rewinded at a higher speed than the lifting part. At this time, the two ends of the tension control part 4 will also produce a difference in speed due to the difference in speed. The existence of the sliding friction force produces a stable torque on the reel body 2 to rewind the screen body 1, that is, it can actively control the screen body 1 to always be rewinded with the same torque, the rewinding process is stable, and it can be guaranteed to be always rewinding. Tightly on the reel body 2 can also reduce the volume of the display device after being rolled up.

The driving part 3 and the tension control part 4 may be located at only one end of the reel body 2 to save production cost. In other embodiments, in order to make the force of the screen body 1 more uniform, the driving part 3 and the tension control part 4 of the power part can be arranged in pairs, and the driving part 3 and the tension control part 4 arranged in pairs are respectively located on the reel. Both ends of body 2. Specifically, the power section includes a first power section and a second power section, the power section includes a first power section and a second power section, and the first power section includes a first drive section and a first tension control section. , The first driving part is connected to the first tension control part and is located at the first end of the reel body, the second power part includes a second driving part and a second tension control part, the second driving The part is connected to the second tension control part and is located at the second end of the reel body. The first driving part and the first tension control part and the second driving part and the second tension control part are arranged symmetrically along the center line of the reel body 2, so that the force of the screen body 1 during the winding/unwinding process is more uniform .

To sum up, in the display device provided by this embodiment, the tension control unit 4 adopts friction control to generate torque between the drive unit 3 and the reel body 2, so that the screen body 1 is subjected to the unwinding and unwinding process. The tensioning force is stable and controllable, which is beneficial to improve the service life of the display device; and the tension on the screen body 1 is easily adjusted, which improves the adaptability to the screen body 1. In addition, in the present display device, when the screen body 1 is unfolded, it is necessary to overcome the preset torque to make the reel body 2 rotate. Therefore, the screen body 1 has a better holding force in a static state, reduces the vibration phenomenon, and can improve the display device. The display effect.

The present application also provides the display device of the second embodiment. Different from the first embodiment, the tension control part in this embodiment controls the torque between the driving part and the reel body by means of electromagnetic force. In this way, the current can be controlled. The size of it is convenient to adjust the torque received by the reel body, which makes the display device more adaptable. Specifically, as shown in FIG. 5, FIG. 5 is a schematic structural diagram of a second embodiment of the tension control unit in the display device of the present application. The tension control unit of this embodiment includes: a stator 51, a rotor 54, a magnet 53, and an elastic member. 52 and cover 55.

Specifically, the stator 51 is connected to the reel body, that is, the reel body can drive the stator 51 to rotate when the reel body rotates. The stator 51 is provided with a first inductance coil 56 which can generate a first magnetic attraction when energized. The cover plate 55 is fixed on the stator 51. Optionally, the cover plate 55 can be fixed on the stator 51 by bolts 57. In other embodiments, the cover plate 55 can also be fixed to the stator 51 by a connecting rod.

The rotor 54 is located between the stator 51 and the cover plate 55, and is arranged adjacent to the cover plate 55; the rotor 54 is connected to the driving part, and the rotor 54 can be rotated under the driving of the driving part. When the driving part and the lifting part rotate at different speeds The speed at which the rotor 54 rotates is also different from the speed at which the cover 55 rotates, and a sliding friction force can be generated between the rotor 54 and the cover 55. The sliding friction force can generate a torque to the reel body. Therefore, the magnitude of the torque received by the reel body can be controlled by controlling the sliding friction between the rotor 54 and the cover 55, thereby controlling the tension of the screen body.

In this embodiment, the magnitude of the sliding friction is related to the pressing force between the cover 55 and the rotor 54 and the friction coefficient between their contact surfaces. Therefore, the magnitude of the torque received by the reel body can be adjusted by controlling the pressing force between the cover 55 and the rotor 54 and the friction coefficient between them.

In this embodiment, by controlling the magnitude of the energized current in the first inductance coil 56 to control the movement of the magnet 53 to change the pressing force between the cover 55 and the rotor 54. Specifically, the magnet 53 is located between the stator 51 and the rotor 54 and is fixed to the stator 51 through an elastic member 52. When the first inductance coil 56 is not energized, the magnet 53 abuts on the rotor 54 under the pressure of the elastic member 52 and presses the rotor 54 and the cover 55 together. When the first inductance coil 56 is energized, the first inductance coil 56 generates a first magnetic attraction force, so that the magnet 53 can move between the stator 51 and the rotor 54, thereby changing the pressing force between the rotor 54 and the cover 55. Specifically, the magnet 53 can move away from the rotor 54 under the action of the first magnetic attraction force, thereby changing the pressure between the rotor 54 and the cover 55. The moving range of the magnet 53 is related to the magnitude of the first magnetic attraction, that is, to the magnitude of the energizing current of the first inductance coil 56. Therefore, only by changing the magnitude of the energizing current of the first inductance coil 56 to change the cover 55 and The pressing force between the rotors 54 can thereby control the tension of the screen body.

In this embodiment, only by adjusting the magnitude of the energized current in the first inductance coil 56, the torque between the driving part and the reel body can be actively adjusted, and the adjustment method is simpler and convenient for operation.

Optionally, the elastic member 52 may be a spring. In other embodiments, the elastic member 52 may also be a rubber member. In order to demagnetize the magnet 53 immediately after power-off, the magnet 53 may be soft iron or silicon steel.

The structure of other parts of the display device in this embodiment is the same as that in the first embodiment, and will not be repeated here.

Different from the first embodiment, in the tension control part of this embodiment, the spool body drives the stator 51 to rotate, and the drive part drives the rotor 54 to rotate, and generates a rotational speed difference between the stator 51 and the rotor 54 so as to be fixed on the stator 51 A sliding friction force is generated between the cover plate 55 and the rotor 54 to generate a constant torque on the reel body, thereby stabilizing the tension of the screen body. This embodiment uses electromagnetic force to actively adjust the magnitude of the torque received by the reel body, thereby controlling the tension of the screen body. This embodiment can more conveniently adjust the torque of the reel body, thereby making it easier to control the tension of the screen body. Strength makes the display device more adaptable.

The present application also provides the display device of the third embodiment, which is different from the first embodiment. In this embodiment, the tension control unit uses magnetic powder to control the torque between the drive unit and the reel body. As shown in FIG. 6, FIG. 6 is a schematic structural diagram of a third embodiment of the tension control unit of the present application. In this embodiment, the tension control unit includes an inner rotor 62, an outer rotor 61 and magnetic powder 64.

In this embodiment, the outer rotor 61 is connected to the driving part, and the inner rotor 62 is connected to the reel body, that is, the driving part can drive the outer rotor 61 to rotate, and the reel body can drive the inner rotor 62 to rotate. The outer rotor 61 is arranged around the outer periphery of the inner rotor 62, and the outer rotor 61 and the inner rotor 62 form an accommodating space, and the magnetic powder 64 is located in the accommodating space.

A second inductive coil 63 is provided on the outer rotor 61. The second inductive coil 63 can generate a second magnetic attraction when energized. The magnetic powder 64 can be arranged along the magnetic flux direction under the action of the second magnetic attraction to form a magnetic powder chain to pass The magnetic powder chain connects the inner rotor 62 and the outer rotor 61, so that the inner rotor 62 and the outer rotor 61 have a corresponding connection force when there is a difference in speed between the inner rotor 62 and the outer rotor 61. The second inductance coil 63 may be arranged in the outer rotor 61 or outside the outer rotor 61, as long as the second inductance coil 63 can be energized to generate a second magnetic attraction force to attract the magnetic powder 64.

When there is a rotational speed difference between the inner rotor 62 and the outer rotor 61, the connecting force of the magnetic powder chain can cause the reel body 2 to generate a corresponding torque, that is, the magnitude of the torque received by the reel body 2 is related to the connecting force of the magnetic powder chain. Therefore, the maximum torque that can be transmitted by the inner rotor 62 and the outer rotor 61 can be changed by adjusting the magnitude of the energizing current to change the connecting force of the formed magnetic powder chain, thereby realizing the tension control of the screen body.

When the second inductance coil 63 is not energized, the magnetic powder 64 can slide freely, there is no connection between the inner rotor 62 and the outer rotor 61, and the inner rotor 62 and the outer rotor 61 can rotate idly.

Different from the first embodiment, in the tension control part of this embodiment, the spool body can drive the inner rotor 62 to rotate, the drive part drives the outer rotor 61 to rotate, and a magnetic powder 64 is arranged between the inner rotor 62 and the outer rotor 61. 64 is subjected to the second magnetic attraction force to form a certain connection force between the inner rotor 62 and the outer rotor 61. When there is a speed difference between the inner rotor 62 and the outer rotor 61, the connection force can generate torque on the reel. When the connecting force is constant, the torque received by the reel body is also constant, so that the tension of the screen body is stable. Moreover, this embodiment uses magnetic powder 64 to actively adjust the torque received by the reel body, thereby controlling the tension of the screen body. The tension control part of this embodiment has a simple structure and can easily adjust the torque of the reel body. , So that the tension of the screen can be conveniently controlled, so that the display device has stronger adaptability.

The above are only implementations of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application.

Claims

A display device, characterized in that the display device comprises:

The screen body,

The reel body is used to rewind/unwind the screen body;

A lifting part, which is connected to the reel body through the screen body, and is used for unwinding the screen body from the reel body;

A power part connected with the reel body to provide power to make the reel body wind up the screen body;

The lifting part and the power part have a rotational speed difference, so that the screen body generates tension during the winding/unwinding process to maintain the flatness of the screen;

During the unwinding process of the screen body, the rotation speed of the lifting part is greater than the rotation speed of the power part, and during the winding process of the screen body, the rotation speed of the power part is greater than the rotation speed of the lifting part.
The display device according to claim 1, wherein the power unit includes a driving unit and a tension control unit, and the driving unit is connected to the reel body through the tension control unit to drive the reel body to rewind. In the screen body, the tension control part is used to actively control the torque between the driving part and the reel body, so as to realize the smooth winding/unwinding of the screen body.
3. The display device according to claim 2, wherein the tension control unit generates a torque between the driving unit and the reel body by means of friction.
The display device according to claim 3, wherein the end of the reel body is provided with a friction plate, and the tension control part comprises:

The shaft core is connected to the driving part;

The first pressing piece and the second pressing piece are arranged on the shaft core at intervals along the axial direction of the shaft core;

The friction plate is located between the first pressing piece and the second pressing piece.
4. The display device according to claim 4, wherein the shaft core, the first pressing piece and the second pressing piece are coaxially arranged.
The display device according to claim 5, wherein the tension control part further comprises a compression nut, the compression nut is located on one side of the first compression piece, and is used to adjust the first compression The pressing force between the tight piece and the second pressing piece and the friction plate.
4. The display device according to claim 4, wherein the shape of the first pressing piece and the second pressing piece are the same.
The display device according to claim 2, wherein the tension control unit electromagnetically causes a torque to be generated between the driving unit and the reel body.
3. The display device according to claim 2, wherein the tension control unit generates a torque between the drive unit and the reel body by means of magnetic powder.
The display device according to claim 2, wherein the power unit includes a first power unit and a second power unit, the first power unit includes a first drive unit and a first tension control unit, and the first power unit includes a first drive unit and a first tension control unit. A driving part is connected to the first tension control part and is located at the first end of the reel body, the second power part includes a second driving part and a second tension control part, and the second driving part is connected to the The second tension control part is located at the second end of the reel body.
The display device according to claim 1, wherein the display device further comprises a support, and the reel body is fixed on the support and can rotate around the central axis of the reel body.