CN113781909A

CN113781909A - Display screen device

Info

Publication number: CN113781909A
Application number: CN202110994532.1A
Authority: CN
Inventors: 郭亚杰; 陈东华
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2021-12-10

Abstract

The invention discloses a display screen device, which comprises a flexible screen and a winding bracket, wherein the flexible screen is arranged on the winding bracket; the winding support comprises a bidirectional screw, a sliding displacement piece, a reel and a swinging rod group; the two-way screw is driven to rotate by a first driving part, and the two sliding displacement pieces are respectively in threaded fit with a left-handed thread section and a right-handed thread section of the two-way screw; the scroll is connected with the flexible screen, the scroll is driven to rotate by a second driving part, and the axial lines of the scroll and the bidirectional screw are parallel; the swing rod group is configured corresponding to the reel; the swing rod group comprises two swing rods, the two swing rods are respectively correspondingly configured with the two sliding displacement pieces and the shaft ends on the two sides of the reel, one end of each swing rod is hinged with the corresponding sliding displacement piece, and the other end of each swing rod is hinged with the corresponding shaft end of the reel. The volume of the display screen after being coiled can be effectively reduced through structural optimization, and the requirements of users for storage and carrying can be met.

Description

Display screen device

Technical Field

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

Background

With the development of social technologies, the display technologies such as folding and winding are convenient for the life of users while improving the visual enjoyment of the users. When large-screen display is needed, the screen can be unfolded; when not using or the user need carry, can curl the display screen, convenient storage or carry after the reduction volume.

The existing winding display screen technology is limited by a winding support structure, the volume is not small enough after winding, and the actual storage or carrying requirements of a user can not be met comprehensively.

In view of the above, it is desirable to optimize the structure of the flexible display device to overcome the defect that the flexible display device cannot be stored or carried well.

Disclosure of Invention

In order to solve the technical problem, the invention provides a display screen device, which can effectively reduce the volume of a display screen after being wound through structural optimization, and can meet the requirements of users for storage and carrying.

The invention provides a display screen device, which comprises a flexible screen and a winding bracket; the winding support comprises a bidirectional screw, a sliding displacement piece, a reel and a swinging rod group; the two-way screw is driven to rotate by a first driving part, and the two sliding displacement pieces are respectively in threaded fit with a left-handed thread section and a right-handed thread section of the two-way screw; the scroll is connected with the flexible screen, the scroll is driven to rotate by a second driving part, and the axial lines of the scroll and the bidirectional screw are parallel; the swing rod group is configured corresponding to the reel; the swing rod group comprises two swing rods, the two swing rods are respectively correspondingly configured with the two sliding displacement pieces and the shaft ends on the two sides of the reel, one end of each swing rod is hinged with the corresponding sliding displacement piece, and the other end of each swing rod is hinged with the corresponding shaft end of the reel.

Optionally, the reel is provided as one reel, and the swing rod groups are correspondingly provided as one group.

Optionally, the number of the reels is two, and the number of the swing rod groups is two; and the two reels and the two groups of swing rod groups are arranged in a mirror image mode relative to the axial line of the bidirectional screw.

Optionally, the two side ends of the reel are respectively and fixedly provided with a connecting piece, and a first hinge part hinged with one end of the corresponding swing rod is formed on the connecting piece.

Optionally, the body of the sliding displacement member is provided with a threaded hole adapted to the corresponding threaded section, and extends from the body to form a second hinge portion hinged to the other end of the corresponding swing rod.

Optionally, a clutch mechanism is provided between the output of the second drive member and the spool to engage or disengage torque transmission therebetween.

Optionally, the controller is further configured to output a control signal to the control ends of the first driving component and the second driving component to control the output of the first driving component and the second driving component.

Optionally, according to a screen furling instruction, the controller outputs a start control signal to the first driving component and the second driving component respectively.

Optionally, the output torque of the first drive member is greater than the output torque of the second drive member.

Optionally, according to a screen opening instruction, the controller outputs a start control signal to the first driving part and simultaneously outputs a disconnection control signal to the control end of the clutch mechanism.

Optionally, the flexible screen is connected to the scroll through a spiral spring, the spiral spring is sleeved on the scroll, an inner end of the spiral spring is fixedly connected to the scroll, and an outer end of the spiral spring is fixedly connected to the flexible screen.

Compared with the existing display screen device which is rolled and unfolded, the invention provides an improved scheme aiming at the rolling bracket. Specifically, the winding support takes a bidirectional screw and two sliding displacement pieces matched with the threads of the left-handed thread section and the right-handed thread section of the bidirectional screw as basic transmission pieces for opening and closing operations, and when the bidirectional screw rotates under the driving of a first driving part, the two sliding displacement pieces can move towards each other or away from each other along the screw; meanwhile, two swing rods of the swing rod group are respectively hinged between the two sliding displacement pieces and the scroll, so that a connecting rod mechanism capable of driving the scroll to slide in a plane is formed. When the bidirectional screw rod rotates along the first direction, the two sliding displacement pieces are closed oppositely along the screw rod and respectively drive the two swinging rods to swing in a mode that the hinged end of the scroll tends to the bidirectional screw rod, so that the scroll is driven to move horizontally towards the bidirectional screw rod; meanwhile, the reel is driven by the second driving part to synchronously rotate, and the winding operation of the flexible screen can be realized. On the contrary, when the two-way screw rod rotates along the second direction, two slip displacement spare are kept away from along the screw rod mutually back to drive two swinging arms respectively and keep away from the mode swing of two-way screw rod with the spool hinged end, and then drive the spool and move towards the direction translation of keeping away from two-way screw rod, can realize the expansion operation of flexible screen. By the arrangement, after the winding operation is finished, the swinging rod group and the reel can be retracted to the postures approximately parallel to the bidirectional screw rod, and the overall dimension can be effectively controlled; compared with the prior art, the display screen device that this scheme provided can realize that flexible screen and support are steady in step and are launched and convolute, and the volume is less after the roll-up, has the characteristics that do benefit to accomodate and conveniently carry.

In an alternative scheme of the invention, the body of the sliding displacement piece is provided with a threaded hole matched with the corresponding threaded section, and a hinge part hinged with the other end of the corresponding swing rod is formed by extending from the body of the sliding displacement piece. Therefore, the hinged part of the sliding displacement piece and the swing rod is positioned beside the body, so that the swing rod is retracted to be parallel to the bidirectional screw, the space occupied by the screen after being wound can be greatly reduced, and the integration level of the retracted support can be improved to the maximum extent.

In another alternative of the invention, a clutch mechanism is provided between the output of the second drive member and the spool to engage or disengage torque transmission therebetween. When the screen is folded, the output end of the second driving part is connected with the winding shaft to drive the winding shaft to rotate, so that the screen is wound on the winding shaft; when the screen is opened, the output end of the second driving part can be disconnected with the winding shaft, the screen is opened under the pushing of the support, and the fact that the screen is kept in a flat state in the opening process can be guaranteed.

In yet another alternative of the present invention, the flexible screen is connected to the scroll shaft through a spiral spring, the spiral spring is sleeved on the scroll shaft, and the inner end of the spiral spring is fixedly connected to the scroll shaft, and the outer end of the spiral spring is fixedly connected to the flexible screen; so set up, the in-process of second drive element drive reel rotation coiling screen, along with the increase of load, volute spiral spring can produce the effort for the screen keeps the state of being levelled, can realize the rotational speed and support from this and open and shut the phase-match, also the screen is packed up speed and support and is packed up speed matching, thereby ensures steadily to open and shut. In addition, based on the setting of spiral spring, can avoid the impact force to act on the screen as the buffering, ensure the reliability of display screen switching operation.

Drawings

FIG. 1 is a schematic diagram illustrating an overall structure of the display device according to an embodiment;

FIG. 2 is a schematic view of a winding cradle of the display device shown in FIG. 1;

fig. 3(a), (b), (c), and (d) respectively show the process schematic of the display screen switching from the unfolding state to the folding state;

FIG. 4 is a schematic structural view of a slide displacement member according to an embodiment;

FIG. 5 is a schematic view of the connection of the spiral spring to the flexible screen and the spool in accordance with one embodiment;

FIG. 6 is a schematic view of another embodiment of the connection of the spiral spring to the spool;

FIG. 7 is an illustration of an engaged state of a clutch mechanism in an embodiment;

FIG. 8 is a schematic illustration of the clutching mechanism shown in FIG. 7 in an open state;

FIG. 9 is a control block diagram of the display device according to the embodiment;

FIG. 10 is a schematic view of another embodiment of the display device;

fig. 11 is a schematic view of a winding stand of the display device of fig. 10.

In the figure:

a flexible screen 10;

a winding support 20, a winding shaft 21, a bidirectional screw 22, a sliding displacement piece 23, a body 231, a wing plate 232, a swinging rod 24, a connecting piece 25, a first driving part 26, a second driving part 27, an output end 271, a clutch mechanism 28, a driving piece 281, a key groove 2811, a driven piece 282 and a clutch key 283;

wrap spring 30, inboard end 31, outboard end 32;

a controller 40.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, a schematic diagram of an overall structure of a display device according to an embodiment of the invention is shown.

As shown, the display screen assembly includes a flexible screen 10 and a roll-up stand 20. In this scheme, flexible screen 10 is bilateral roll-up, and its both sides limit links to each other with two spools 21 of coiling support 20 respectively to according to the needs expansion of in-service use or coiling on spool 21.

The winding support 20 adopts a sliding and rotating structure, so that the volume of the screen after winding is smaller, and the screen is convenient to carry. Referring also to fig. 2, the construction and assembly of the winding cradle is shown.

The winding support 20 uses a bidirectional screw 22 and two sliding displacement pieces 23 as basic transmission parts for opening and closing operations, as shown in fig. 2, the two sliding displacement pieces 23 are respectively in threaded fit with left-hand and right-hand threaded sections of the bidirectional screw 22, and the sliding displacement pieces 23 can move at a uniform speed along the axial direction of the screw along with the rotation of the bidirectional screw 22.

The bidirectional screw 22 is driven to rotate by a first driving member 26, and preferably, a motor is used as the first driving member 26. When the bidirectional screw 22 is rotated by the first driving member 26 (forward rotation, reverse rotation), the two slide displacement members 23 can move toward each other or away from each other along the screw.

As shown in the figure, two reels 21 are disposed in parallel with the axial line of the bidirectional screw 22 to smoothly perform the opening and closing operation of the screen. Each of the reels 21 is driven to rotate by the second driving part 27, and based on the rotation of the reels 21 driven by the second driving part 27, the winding operation of the flexible screen can be realized. Preferably, the second driving member 27 may be a motor.

Two groups of swing rod sets are configured based on bilateral winding, as shown in fig. 2, two reels 21 and two groups of swing rod sets configured correspondingly are both configured in a mirror image mode relative to the axis of the bidirectional screw 22 so as to drive the reels 21 on two sides to act synchronously; meanwhile, based on the mirror image arrangement, the swing rods 24 of the two swing rod groups have the same structure, and have better interchangeability as independent components, so that the product cost can be reduced.

Specifically, each group of swing levers in the present solution includes two swing levers 24, the two swing levers 24 are respectively configured corresponding to the two sliding displacement members 23 and the two side shaft ends of the reel 21, one end of each swing lever 24 is hinged to the corresponding sliding displacement member 23, and the other end is hinged to the corresponding shaft end of the reel 21. As the position of slide displacement member 23 changes, rocking lever 24 rotates to a corresponding angle. In other words, the two oscillating levers 24 of each oscillating lever group are respectively hinged between the corresponding side reel 21 and the two sliding displacement members 23 to constitute a linkage mechanism that can drive the reel 21 to slide in a plane.

In the following, the transmission principle of the display device according to the embodiment in the opening and closing process will be briefly described by taking an example that the two-way screw 22 rotates along the first direction (the motor rotates forward) and the two sliding displacement pieces 23 approach each other in opposite directions, and the two-way screw 22 rotates along the second direction (the motor rotates backward) and the two sliding displacement pieces 23 move away from each other in opposite directions.

Referring to fig. 3, a schematic diagram of the process of switching the display screen from the extended state (a) to the retracted state (d) is shown. For clarity of illustration of the sequence of actions, only the open/close posture change of the winding frame is shown in the figure, and the flexible screen is not shown in the figure.

As shown in fig. 3(a), the screen of the display device is in a fully-extended state in which the four swing levers 24 are each substantially perpendicular to the bidirectional screw 22 and the reel 21. It should be understood that the winding cradle 20 has been opened to its maximum deployment from the structural configuration of the winding cradle 20; in theory, in the fully expanded state shown in fig. 3(a), the flexible screen may not reach its actual expandable size.

When the motor rotates forwards, the bidirectional screw 22 rotates and drives the two sliding displacement pieces 23 to move close towards each other, as shown by an arrow A in the figure; each sliding displacement member 23 drives a corresponding two oscillating rods 24 to oscillate in such a way that the hinged end of the reel tends towards the bidirectional screw 22, as shown by the arrow B in the figure; which in turn causes the two reels 21 to translate towards the bidirectional screw, as shown in the figure by the arrow C.

As the motor rotates, the winding bracket 20 is gradually retracted as shown in fig. 3(b), 3(c), and 3 (d). At the same time, the reel 21 is driven by the second driving part 27 to rotate synchronously, so that the flexible screen can be wound on the reel 21.

The above is the actuating mechanism of the display screen furling action process. On the contrary, when the motor rotates reversely, the two-way screw 22 rotates and drives the two sliding displacement pieces 23 to move away from each other along the screw, and the corresponding swing rods are driven to swing in a mode that the hinge ends of the scroll are far away from the two-way screw 21, so that the scroll is driven to move horizontally towards the direction far away from the two-way screw, and the display screen is opened. The process of unwinding the winding frame 20, i.e., the attitude change shown in reverse order in the sequence diagrams shown in fig. 3.

The screen folding process illustrated in fig. 3 is a state of four characteristic points formed based on the configuration of the winding stand 20. As mentioned above, from the structural configuration relationship of the winding frame 20, the winding frame 20 shown in fig. 3(a) is opened to the maximum expansion state, and those skilled in the art can understand that fig. 3(a) is not the only state in which the screen is actually expanded, and it should be understood that the state shown in fig. 3(b) or any dynamic matching state between the various feature points shown in the figure can be used as an expansion use state based on the structure of the winding frame 20, and can be specifically selected according to the actual use requirement.

In addition, it should be understood by those skilled in the art that the state shown in fig. 3(d) occupies the minimum space, and is also the only state that the screen is actually folded based on the winding frame 20, in other words, the state shown in the figure is not the only state that the screen is actually folded, and theoretically, as long as the actual requirements of storage or carrying are met, the state shown in fig. 3(c) can also be used as a folding state.

In order to achieve a better integration of the roll-up stand and a further reduction of the overall dimensions after storage, the design of the articulated relationship of the two ends of the respective pivoting lever 24 can be further optimized.

As shown in fig. 2 and 3, a connection member 25 is fixedly provided at each of both side ends of the reel 21, and a first hinge portion E hinged to one end of the corresponding swing lever 24 is formed at the connection member 25, specifically, the first hinge portion E is formed extending from a body of the connection member 25 toward the bidirectional screw 22. Correspondingly, the body of the sliding displacement member 23 is provided with a threaded hole adapted to the corresponding threaded section, and a second hinge portion F hinged to the other end of the corresponding swing rod 24 is formed by extending from the body.

Thus, when the winding frame 20 is fully retracted, as shown in fig. 3(d), the second hinge portion of the sliding displacement member 23 hinged to the swing lever 24 is located at the side of the body thereof, and the first hinge portion of the connecting member 25 and the swing lever 24 is opposite to the first hinge portion along the screw length direction, so that each swing lever 24 has a state of being retracted in parallel to the bidirectional screw 22, the occupied space in the direction perpendicular to the screw is minimized, and the integration of the retracted frame can be maximized.

Such as, but not limited to, the sliding displacement member 23 shown in fig. 4. The body 231 of the sliding displacement member 23 is provided with a threaded hole matched with the two-way screw 22, two wing plates 232 extend from two sides of the body 231 respectively, the two wing plates 232 on the same side are arranged at intervals to accommodate the hinged ends of the corresponding swing rods 24, and during assembly, one end of each swing rod 24 is arranged between the two wing plates 232 and then is inserted with the hinged shaft. The whole stress state is better, and the hinge joint relation with good bearing capacity can be constructed.

It is understood that different configurations of connecting member 25 and sliding displacement member 23 are possible, and are within the scope of the present application, provided that the functional requirements of the dynamic fit relationship described above are met.

In order to further improve the actuation during the opening of the screen, a clutch mechanism 28 may be provided between the output of the second drive member 27 and the respective reel 21 to engage or disengage the transmission of torque therebetween. Here, the "clutch mechanism" may take various configurations, such as, but not limited to, a function of engaging or disengaging torque transmission based on a key coupling structure. Referring to fig. 7 and 8 together, a key coupling clutch mechanism is shown, wherein fig. 7 is a schematic view of an engaged state of the clutch mechanism, and fig. 8 is a schematic view of a disengaged state of the clutch mechanism shown in fig. 7.

The clutch mechanism 28 comprises a transmission pair and a clutch key 283, wherein a driving member 281 and a driven member 282 of the transmission pair are respectively arranged on the output end 271 of the second driving part and the reel 21 so as to transmit torque when the key coupling structure is engaged; as shown in the figure, the clutch key 283 is disposed between the output end 271 of the second driving member and the driving member 281, the clutch key 283 can be fixed on the output end 271, and the driving member 281 is provided with a key slot 2811 adapted to the clutch key 283, and can be switched between an engaged state shown in fig. 7 and a disengaged state shown in fig. 8 based on the axial relative sliding displacement.

In practical applications, the transmission pair may be a gear transmission pair, a sprocket transmission pair, or the like, as long as it can transmit torque in an engaged state and can realize the above-mentioned key coupling structure.

In other embodiments, the clutch key 283 and mating key slot may be provided on the follower 282 and the spool 21, and may also be used to engage or disengage torque transmission based on a keyed coupling.

When the screen is taken up, the output end of the second driving part 27 can be coupled with the winding shaft 21 to drive the corresponding winding shaft 21 to rotate, so that the flexible screen 10 is wound on the winding shaft 21; when the screen is opened, the output end of the second driving part 27 can be disconnected with the winding shaft 21, and the screen is opened under the pushing of the winding bracket 20, so that the screen can be kept in a flat state in the opening process.

In order to avoid the impact of the acting force of the opening and closing process on the screen and further improve the flatness of the unfolded screen, the flexible screen 10 in the present solution is connected to the scroll 21 on the corresponding side through the spiral spring 30, please refer to fig. 5, which shows a schematic connection relationship between the spiral spring 30 and the flexible screen 10 and the scroll 21.

As shown in fig. 5, scroll spring 30 is fitted around reel 21, and has bending section 3 at inner end 31 inserted and fixed in reel 21 and outer end fixedly connected to flexible panel 10. For example, but not limited to, the outer end 32 of scroll spring 30 and flexible panel 10 may be fixed by an adhesive process to facilitate winding of flexible panel 10 around spool 21.

Referring also to FIG. 6, another connection of wrap spring 30 to spool 21 is shown. As shown in fig. 6, the inner end 31 of the spiral spring 30 sleeved on the winding shaft 21 can be fixed on the corresponding winding shaft 21 by using an adhesive process, and the reliable fixation between the spiral spring 30 and the winding shaft 21 can also be realized.

Based on the setting of scroll spring 30, in the process that second drive element 27 drives scroll 21 to rotate and wind the screen, along with the increase of load, this scroll spring 30 can produce the effort for the screen keeps the state of being leveled, can realize that the rotational speed matches with the support opens and shuts from this, and that is the screen speed of packing up matches with the support speed of packing up, thereby ensures smooth opening and shutting. In addition, due to the arrangement of the scroll spring 30, the impact force is prevented from being applied to the screen as a buffer.

Please refer to fig. 9, which is a control block diagram of the display device according to the present embodiment.

According to the user instruction, the controller 40 can output control signals to the control ends of the first driving part 26 and the second driving part 27 to control the output of the first driving part 26 and the second driving part 27, and the opening and closing of the winding support 20 is matched with the operation of the scroll 21 to complete the winding or unwinding of the screen.

Specifically, the controller 40 outputs start control signals to the first driving part 26 and the second driving part 27, respectively, according to the screen retracting instruction. In the screen winding process, the first driving part 26 drives the bidirectional screw 22 to drive the two sliding displacement pieces 23 to approach each other, and the support is wound up; the second driving member 27 drives the corresponding reel 21 to rotate, and the winding of the flexible screen 10 is completed synchronously.

Here, the output torque of the first drive member 26 may be greater than the output torque of the second drive member 27. In practical application, the first driving part 26 drives the bidirectional screw 22 to rotate at low speed and high power, the screen reel 21 slides in a plane to realize opening and closing of the bracket, and meanwhile, the reel 21 rotates around the axis of the reel under the driving of the second driving part 27 with high speed and low power output to realize opening and closing of the screen. On the basis, the scroll spring 30 is used for assisting, so that the screen and the support are always in a flat state when being matched, and the flexible screen and the support can be further ensured to be synchronously and stably unfolded and wound integrally.

Specifically, the controller 40 outputs an on control signal to the first drive member 26 and simultaneously outputs an off control signal to the control terminal of the clutch mechanism 44 in accordance with a screen-on command. In the process of opening the screen, the output end of the second driving part 27 can be disconnected from the winding shaft 21, the first driving part 26 drives the bidirectional screw 22 to drive the two sliding displacement parts 23 to move away from each other along the screw, and the two winding shafts 21 move in the direction away from the bidirectional screw 22 to realize the opening of the screen of the display screen.

In addition, based on the core design concept of the present application, a design that the flexible screen 10 is one-side single-winding may also be adopted, please refer to fig. 10 and 11, where fig. 10 is a schematic view of the overall structure of the single-side winding display device, and fig. 11 is a schematic view of a winding bracket of the single-side winding display device. In order to clearly illustrate the differences and connections between this embodiment and the double-wound embodiment described above, the same functional configurations and structures are shown with the same reference numerals in the drawings.

As shown in the figure, the winding frame 20 also has a bidirectional screw 22 and two sliding displacement members 23 as basic transmission members for opening and closing operations, and the sliding displacement members 23 can move at a constant speed along the axial direction of the screw along with the rotation of the bidirectional screw 22.

The present solution provides a reel 21 and a set of oscillating levers, i.e. two oscillating levers 24, respectively hinged to the reel 21, are provided. The bidirectional screw 22 is also driven by the first driving member 26 to rotate, and when the bidirectional screw 22 is driven by the first driving member 26 (forward rotation and reverse rotation), the two sliding displacement members 23 can move toward each other or away from each other along the screw.

In the scheme, one side of the flexible screen 10 is fixed, and the other side is connected with the scroll 21. The reel 21 is also arranged in parallel with the axial lead of the bidirectional screw 22 and is driven to rotate by the second driving part 27, and the one-sided winding operation of the flexible screen can be realized based on the rotation of the reel 21 driven by the second driving part 27.

Other configurations and connections are the same as the double-sided winding scheme described above and are not described in detail here.

It should be noted that the use of the ordinal terms "first" and "second" herein is used to distinguish functionally identical components or structures, so as to clearly express the relationship between the components. It should be understood that the use of the ordinal terms first and second do not constitute a substantial limitation on the technical solution claimed herein.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A display screen device is characterized by comprising a flexible screen and a winding bracket; the winding cradle includes:

the bidirectional screw is driven to rotate by the first driving part;

the two sliding displacement pieces are respectively in threaded fit with the left-handed thread section and the right-handed thread section of the bidirectional screw;

the scroll is connected with the flexible screen, the scroll is driven to rotate by a second driving part, and the axial lines of the scroll and the bidirectional screw are parallel;

a group of swing levers configured corresponding to the reel; the swing rod group comprises two swing rods, the two swing rods are respectively correspondingly configured with the two sliding displacement pieces and the shaft ends on the two sides of the reel, one end of each swing rod is hinged with the corresponding sliding displacement piece, and the other end of each swing rod is hinged with the corresponding shaft end of the reel.

2. A screen assembly as defined in claim 1, wherein said roller is provided as one and said groups of said rocking levers are provided as a group.

3. The display screen device according to claim 1, wherein the number of the reels is two, and the groups of the swing levers are arranged in two groups; and the two reels and the two groups of swing rod groups are arranged in a mirror image mode relative to the axial line of the bidirectional screw.

4. The display apparatus as claimed in claim 2 or 3, wherein a connection member is fixedly provided at both side ends of the winding shaft, respectively, and a first hinge portion hinged to one end of the corresponding swing lever is formed at the connection member.

5. The display device as claimed in claim 4, wherein the body of the sliding displacement member is provided with a threaded hole adapted to the corresponding threaded section, and a second hinge portion is formed extending from the body of the sliding displacement member and hinged to the other end of the corresponding swing lever.

6. A display device as claimed in claim 1, characterised in that a clutch mechanism is provided between the output of the second drive member and the roller to engage or disengage torque transmission therebetween.

7. The display device according to claim 6, further comprising a controller for outputting control signals to control terminals of the first and second driving parts to control outputs of the first and second driving parts.

8. The display device according to claim 7, wherein the controller outputs start control signals to the first driving part and the second driving part, respectively, according to a screen winding instruction.

9. The display device according to claim 8, wherein an output torque of the first driving member is larger than an output torque of the second driving member.

10. The display device according to claim 9, wherein the controller outputs an on control signal to the first driving part and simultaneously outputs an off control signal to a control terminal of the clutch mechanism according to a screen-on command.

11. The display device of claim 10, wherein the flexible screen is connected to the roller by a spiral spring, the spiral spring being fitted over the roller and having an inner end fixedly connected to the roller and an outer end fixedly connected to the flexible screen.