A rollable display device

Abstract

A rollable display device relates to the technical field of display devices, comprising a housing, a driving mechanism and a flexible carrier film disposed in the housing, and a flexible display screen; the flexible carrier film is configured to rotate under the drive of the driving mechanism; the first end of the flexible display screen is fixed to the flexible carrier film, the second end of the flexible display screen is configured to extend from an opening disposed on the housing to the outside of the housing, and the flexible display screen can be rolled up on the flexible carrier film and can be unfolded under external force. The rollable display device of the embodiment of the present application can reduce the number of winding turns of the flexible display screen, thereby reducing the stress and strain accumulation of the flexible display screen, reducing the extrusion between the film layers of the flexible display screen, and is not easy to cause damage to the flexible display screen.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a rollable display device. Background Art

[0002] With the advancement of science and technology and the development of society, flexible displays have gradually entered the field of vision of consumers. While making life more convenient for consumers, rollable flexible displays have also brought consumers a new user experience. When some rollable display devices are rolled up, due to the limited diameter of the reel for rolling up the flexible display, as the number of winding turns increases, the stress and strain accumulation will continue to increase, and the film layers of the flexible display will be severely squeezed, which can easily cause display failure. Summary of the invention

[0003] An embodiment of the present application provides a rollable display device, comprising a shell, a driving mechanism and a flexible carrier film arranged in the shell, and a flexible display screen; the flexible carrier film is configured to rotate under the drive of the driving mechanism; a first end of the flexible display screen is fixed on the flexible carrier film, and a second end of the flexible display screen is configured to extend from an opening provided on the shell to the outside of the shell; the flexible display screen can be rolled up on the flexible carrier film and can be unfolded under the pulling of an external force.

[0004] Optionally, the driving mechanism includes a driving shaft and a driven shaft rotatably disposed in the shell, and a first driving component capable of driving the driving shaft to rotate, and the flexible supporting film is sleeved on the driving shaft and the driven shaft, and is configured to drive the driven shaft to rotate when the driving shaft rotates.

[0005] Optionally, the flexible carrier film is provided with a plurality of transmission parts along the circumferential direction near the edges of both sides, and the driving shaft and the driven shaft are provided with a plurality of transmission matching parts along the circumferential direction near the two ends, and the transmission matching parts are configured to cooperate with the transmission parts for transmission during the rotation of the flexible carrier film.

[0006] Optionally, the transmission portion is a through hole, and the transmission matching portion is a protrusion matched with the through hole.

[0007] Optionally, the width of the flexible display screen is smaller than the width of the flexible carrier film, and the two side edges of the flexible display screen are located between the transmission parts on two sides of the flexible carrier film.

[0008] Optionally, a first step is provided on the outer circumferential surface of the driving shaft, a second step is provided on the outer circumferential surface of the driven shaft, the two ends of the flexible carrier film are overlapped and fixed, and the first end of the flexible display screen is connected to the first end of the flexible carrier film; the driving mechanism is configured so that when the second end of the flexible carrier film cooperates with one of the first step and the second step, the other of the first step and the second step does not contact the flexible carrier film, and is configured so that when the second end of the flexible carrier film does not contact the driving shaft and the driven shaft, neither the first step nor the second step contacts the flexible carrier film.

[0009] Optionally, the heights of the first step and the second step are consistent with the thickness of the flexible carrier film, and the thickness of the flexible carrier film is consistent with the thickness of the flexible display screen.

[0010] Optionally, the diameter of the outer circumferential surface of the driving shaft gradually increases from the lower position of the first step to the higher position of the first step, and the diameter of the outer circumferential surface of the driven shaft gradually increases from the lower position of the second step to the higher position of the second step.

[0011] Optionally, the rollable display device further comprises a transmission device disposed between the driving shaft and the driven shaft, and the driving shaft drives the driven shaft to rotate synchronously through the transmission device.

[0012] Optionally, the transmission device is a gear transmission device, which includes a first gear fixed on the driving shaft, a second gear fixed on the driven shaft, and a third gear rotatably arranged on the housing and meshing with both the first gear and the second gear.

[0013] Optionally, the rollable display device also includes a scroll rotatably arranged in the shell, a second driving component capable of driving the scroll to rotate, and a support sheet, one end of the support sheet is fixed to the scroll, the other end of the support sheet extends from the opening and is fixed to the second end of the flexible display screen, and the support sheet is configured to be rolled up on the scroll when the flexible display screen is in a rolled-up state, and is configured to be unfolded and supported on a side of the flexible display screen away from the display side when the flexible display screen is in an unfolded state.

[0014] Optionally, the rollable display device also includes two support plates and a first cover body, the shell is fixed between the two support plates, both ends of the scroll can move through the shell body, the first cover body is fixed to the support plates and covers the end of the scroll, the second driving component is a torsion spring and is sleeved on the end of the scroll, and the two end feet of the torsion spring are respectively fixed on the scroll and the first cover body.

[0015] Optionally, the rollable display device further includes a retractable bracket located outside the shell, one end of the retractable bracket is fixed to the shell, and the other end of the retractable bracket is fixed to the second end of the flexible display screen, and the retractable bracket is configured to support a side of the support sheet away from the flexible display screen when the flexible display screen is in an unfolded state.

[0016] Optionally, the retractable bracket includes a plurality of first links hinged in sequence and a plurality of second links hinged in sequence, the middle position of each first link is hinged to the middle position of a corresponding second link, the first link and the second link located at one end of the retractable bracket are both hinged to the shell, and the first link and the second link located at the other end of the retractable bracket are both hinged to the second end of the flexible display screen.

[0017] Optionally, the rollable display device also includes two support plates and a second cover body, the shell is fixed between the two support plates, both ends of the driving shaft are movably passed through the shell body, the second cover body is fixed to the support plates and covers the end of the driving shaft, the first driving component is a torsion spring and is sleeved on the end of the driving shaft, and the two end feet of the torsion spring are respectively fixed on the driving shaft and the second cover body.

[0018] The rollable display device of the embodiment of the present application is provided with a flexible carrier film that rotates under the drive of a driving mechanism, and the flexible display screen is rolled up on the flexible carrier film. In this way, the circumference of the flexible carrier film can be designed to be larger according to actual needs. When the flexible display screen is rolled up on the flexible carrier film, the number of winding circles of the flexible display screen can be reduced, thereby reducing the stress and strain accumulation of the flexible display screen, reducing the extrusion between the film layers of the flexible display screen, and not easily causing damage to the flexible display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0020] Figure 1 It is a schematic structural diagram of a rollable display device of some exemplary embodiments when the flexible display screen is in an unfolded state;

[0021] Figure 2 Schematic diagrams of structures of rollable display devices according to other exemplary embodiments when the flexible display screen is in an unfolded state;

[0022] Figure 3 For some exemplary embodiments Figure 2A schematic structural diagram of the rollable display device at another viewing angle;

[0023] Figure 4 Schematic diagram of the installation structure of the driving mechanism and the flexible carrier film of the rollable display device in some exemplary embodiments;

[0024] Figure 5 Schematic diagrams of the installation structure of the driving mechanism and the flexible carrier film of the rollable display device in other exemplary embodiments;

[0025] Figure 6 Schematic diagram of the installation structure of a driving shaft, a driven shaft, a flexible carrier film and a flexible display screen of a rollable display device in some exemplary embodiments;

[0026] Figure 7 A schematic diagram of the installation structure of a flexible display screen and a support sheet of a rollable display device in some exemplary embodiments;

[0027] The accompanying drawings are marked as follows:

[0028] 1. Shell, 101. Opening, 2. Driving shaft, 201. First transmission matching part, 202. First step, 3. Driven shaft, 301. Second transmission matching part, 302. Second step, 4. Flexible bearing film, 401. Transmission part, 402. First end of flexible bearing film, 403. Second end of flexible bearing film, 5. Flexible display screen, 501. First end of flexible display screen, 502. Second end of flexible display screen, 6. Transmission device, 601. First gear, 602. Second gear, 603. Third gear, 7. Scroll, 8. Support sheet, 9. Retractable bracket, 901. First connecting rod, 902. Second connecting rod, 11. First support plate, 12. Second support plate, 13. First cover body, 14. Second cover body. DETAILED DESCRIPTION

[0029] The technical solution of the present application is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described here are only used to explain the present application, rather than to limit the present application.

[0030] like Figure 1 , Figure 6 As shown, an embodiment of the present application provides a rollable display device, including a shell 1, a driving mechanism and a flexible carrier film 4 arranged in the shell 1, and a flexible display screen 5; the flexible carrier film 4 is configured to rotate under the drive of the driving mechanism; the first end 501 of the flexible display screen 5 is fixed on the flexible carrier film 4, and the second end 502 of the flexible display screen 5 is configured to extend out of the shell 1 from an opening 101 set on the shell 1, and the flexible display screen 5 can be rolled up on the flexible carrier film 4 and can be unfolded under external force.

[0031] The rollable display device of the embodiment of the present application is provided with a flexible carrier film 4 that rotates under the drive of a driving mechanism, and the flexible display screen 5 is rolled up on the flexible carrier film 4. In this way, the circumference of the flexible carrier film 4 can be designed to be larger according to actual needs. When the flexible display screen 5 is rolled up on the flexible carrier film 4, the number of winding circles of the flexible display screen 5 can be reduced, thereby reducing the strain accumulation of the flexible display screen 5, alleviating the extrusion between the film layers of the flexible display screen 5, and not easily causing damage to the flexible display screen 5.

[0032] like Figure 1 , Figure 4 As shown, in some exemplary embodiments, the driving mechanism includes a driving shaft 2 and a driven shaft 3 rotatably arranged in a housing 1, and a first driving component capable of driving the driving shaft 2 to rotate, and a flexible carrier film 4 is sleeved on the driving shaft 2 and the driven shaft 3, and is configured to drive the driven shaft 3 to rotate when the driving shaft 2 rotates. In one example of this embodiment, the driving shaft 2 and the driven shaft 3 are arranged in parallel, and the axial directions of the driving shaft 2 and the driven shaft 3 are perpendicular to the rotation direction of the flexible carrier film 4, and the two ends of the driving shaft 2 and the driven shaft 3 can be rotatably arranged on the housing 1. A plurality of transmission parts 401 are circumferentially arranged near the edges of both sides of the flexible carrier film 4, and the plurality of transmission parts 401 can be evenly spaced. A plurality of first transmission matching parts 201 are circumferentially provided near both ends of the driving shaft 2, and a plurality of second transmission matching parts 301 are circumferentially provided near both ends of the driven shaft 3. The first transmission matching parts 201 and the second transmission matching parts 301 are configured to match with the transmission part 401 for transmission during the rotation of the flexible carrier film 4, so that the driving shaft 2 drives the driven shaft 3 to rotate through the flexible carrier film 4 during the rotation. The transmission part 401 may be a through hole, and the shape of the through hole may be rectangular, circular, etc. The first transmission matching parts 201 and the second transmission matching parts 301 are both protrusions adapted to the through hole, and the shape of the protrusions may be rectangular blocks, trapezoidal blocks, cylindrical, hemispherical, etc. The portion of the flexible carrier film 4 that contacts the driving shaft 2 and the driven shaft 3 during the rotation process is attached to the outer circumferential surface of the driving shaft 2 and the driven shaft 3. Flexible display screen 5( Figure 4 The width of the flexible carrier film 4 (not shown) can be smaller than the width of the flexible carrier film 4, and the two side edges of the flexible display screen 5 are located between the transmission parts 401 on both sides of the flexible carrier film 4, so that the flexible display screen 5 does not hinder the transmission part 401 from matching with the first transmission matching part 201 and the second transmission matching part 301. Figure 1As shown, when the rollable display device of this exemplary embodiment is not in use, the flexible display screen 5 is in a rolled-up state, and the second end 502 of the flexible display screen 5 is located outside the housing 1. When the flexible display screen 5 needs to be unfolded, the second end 502 of the flexible display screen 5 can be pulled by external force to unfold the flexible display screen 5. The flexible display screen 5 drives the shaft 2 to rotate forward during the unfolding process, and the flexible display screen 5 drives the shaft 2 to rotate reversely during the rolling process. The second end 502 of the flexible display screen 5 can be provided with a circuit board for connecting to an external driving device to drive the flexible display screen 5 to display.

[0033] In some exemplary embodiments, the material of the flexible carrier film 4 may include one or more of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyimide (PI). When the flexible display screen 5 is in a rolled-up state, the film layers will squeeze each other, especially under long-term static rolling or high temperature and high humidity conditions, stress relaxation and creep will occur, and the film layers are easily damaged by the squeezing effect. Figure 6 As shown, the portion of the flexible carrier film 4 located between the driving shaft 2 and the driven shaft 3 has a certain deformation ability because it does not contact the driving shaft 2 and the driven shaft 3. In this way, it can absorb the deformation caused by the flexible display screen 5, and can effectively reduce the mutual squeezing force between the film layers of each circle of the flexible display screen 5, thereby improving the reliability of the use of the flexible display screen 5.

[0034] like Figure 1 As shown, in some exemplary embodiments, the first driving component may be a motor, a torsion spring or a coil spring, etc. The motor is configured to drive the driving shaft 2 to rotate forward or reversely to cooperate with the unfolding or rewinding action of the flexible display screen 5. The torsion spring and the coil spring may be configured to undergo elastic deformation during the unfolding process of the flexible display screen 5, and use their own elastic force to drive the driving shaft 2 to reverse when the flexible display screen 5 needs to be retracted, thereby retracting the flexible display screen 5. The torsion spring and the coil spring are collectively referred to as an elastic member, and the elastic member may be arranged at the end of the driving shaft 2, one end of the elastic member is fixed to the driving shaft 2, and the other end of the elastic member is fixed to the housing 1.

[0035] like Figure 6 As shown, Figure 6The directions of the two arrows in represent the rotation directions of the driving shaft 2 and the driven shaft 3 during the rolling process of the flexible display screen 5. In some exemplary embodiments, a first step 202 is provided on the outer circumferential surface of the driving shaft 2, a second step 302 is provided on the outer circumferential surface of the driven shaft 3, the two ends of the flexible carrier film 4 are overlapped and fixed, and the first end 501 of the flexible display screen 5 is docked with the first end 402 of the flexible carrier film 4; the driving mechanism is configured so that when the second end 403 of the flexible carrier film 4 cooperates with one of the first step 202 and the second step 302 (that is, the second end 403 of the flexible carrier film 4 fills the first step 202 or the second step 302), the other of the first step 202 and the second step 302 does not contact the flexible carrier film 4, and is configured so that when the second end 403 of the flexible carrier film 4 does not contact the driving shaft 2 and the driven shaft 3, the first step 202 and the second step 302 do not contact the flexible carrier film 4. In one example of this embodiment, the first step 202 is arranged along the axial direction of the driving shaft 2, and the second step 302 is arranged along the axial direction of the driven shaft 3. The heights of the first step 202 and the second step 302 are consistent with the thickness of the flexible carrier film 4, and the thickness of the flexible carrier film 4 is consistent with the thickness of the flexible display screen 5. During the rotation of the flexible carrier film 4, the overlapping positions of both ends of the flexible carrier film 4 rotate accordingly, and the second end 403 of the flexible carrier film 4 can rotate to a position in contact with the driving shaft 2, a position in contact with the driven shaft 3, and a position not in contact with both the driving shaft 2 and the driven shaft 3. By respectively setting the first step 202 and the second step 302 on the driving shaft 2 and the driven shaft 3, the two ends of the flexible carrier film 4 are overlapped and fixed, and the first end 501 of the flexible display screen 5 is connected to the first end 402 of the flexible carrier film 4 (the first end 501 of the flexible display screen 5 can be bonded to the outer surface of the flexible carrier film 4 by an adhesive), and the first step 202 or the second step 302 is filled by the second end 403 of the flexible carrier film 4. In this way, no height difference will be formed between the first end 501 of the flexible display screen 5 and the outer surface of the flexible carrier film 4, and then when the flexible display screen 5 is rolled up on the flexible carrier film 4, the first end 501 of the flexible display screen 5 will not cause stress concentration to the local part of the flexible display screen 5, and will not cause damage to the flexible display screen 5.

[0036] like Figure 6As shown, in an example of this embodiment, the diameter of the outer circumferential surface of the driving shaft 2 gradually increases from the lower position of the first step 202 to the higher position of the first step 202, and the diameter of the outer circumferential surface of the driven shaft 3 gradually increases from the lower position of the second step 302 to the higher position of the second step 302. In this way, the curvature of the outer circumferential surface of the driving shaft 2 and the driven shaft 3 gradually changes smoothly, and the curvature of the portion where the flexible carrier film 4 fits with the outer circumferential surface of the driving shaft 2 and the driven shaft 3 is also smooth, so that the flexible display screen 5 can be smoothly wound on the flexible carrier film 4 without causing local stress concentration. In this exemplary embodiment, the above-mentioned matching between the second end 403 of the flexible carrier film 4 and the first step 202 and the second step 302 can be ensured by comprehensively designing parameters such as the diameter of the outer circumferential surface of the driving shaft 2 and the driven shaft 3, and the axis spacing between the driving shaft 2 and the driven shaft 3. The structures of the driving shaft 2 and the driven shaft 3 can be the same. The larger the diameter of the outer circumferential surface of the driving shaft 2 and the driven shaft 3, the larger the axial distance between the driving shaft 2 and the driven shaft 3, the fewer the number of winding turns of the flexible display screen 5, the smaller the strain accumulation of the flexible display screen 5, and the less likely the flexible display screen 5 is to be damaged.

[0037] like Figure 5 As shown, in some exemplary embodiments, the rollable display device further includes a transmission device 6 disposed between the driving shaft 2 and the driven shaft 3, and the driving shaft 2 drives the driven shaft 3 to rotate synchronously through the transmission device 6. In this exemplary embodiment, when the diameter of the outer circumference of the driving shaft 2 and the driven shaft 3 is large, the required winding force is small during the process of rolling up the flexible display screen 5, and the driving shaft 2 can easily drive the driven shaft 3 to rotate through the flexible carrier film 4. When the diameter of the outer circumference of the driving shaft 2 and the driven shaft 3 is small, the required winding force is large, and an additional transmission device is required to drive the driving shaft 2 and the driven shaft 3 to rotate. In this exemplary embodiment, by setting the transmission device 6, the transmission speed and rotation displacement of the driving shaft 2 and the driven shaft 3 can be ensured to be consistent, ensuring the synchronization of the rotation of the driving shaft 2 and the driven shaft 3. In this exemplary embodiment, the structure of the transmission device 6 is not limited, and the transmission device 6 can be a gear transmission mechanism, a belt transmission mechanism, a chain transmission mechanism or a connecting rod mechanism. In one example of this embodiment, the transmission device 6 is a gear transmission device, which includes a first gear 601 fixed on the driving shaft 2, a second gear 602 fixed on the driven shaft 3, and a third gear 603 rotatably disposed on the housing 1 and meshing with the first gear 601 and the second gear. The first gear 601 and the second gear 602 are respectively disposed at the ends of the driving shaft 2 and the driven shaft 3.

[0038] like Figure 1 , Figure 3 , Figure 7As shown, in some exemplary embodiments, the rollable display device further includes a reel 7 rotatably disposed in the housing 1, a second driving component capable of driving the reel 7 to rotate, and a support sheet 8, one end of the support sheet 8 is fixed on the reel 7, the other end of the support sheet 8 extends from the opening 101 on the housing 1 and is fixed to the second end 502 of the flexible display screen 5, and the support sheet 8 is configured to be rolled up on the reel 7 when the flexible display screen 5 is in a rolled-up state, and is configured to be unfolded and supported on the side of the flexible display screen 5 away from the display side when the flexible display screen 5 is in an unfolded state. In an example of this embodiment, the support sheet 8 may be a thin metal sheet that can be rolled up on the reel 7 and unfolded, such as a stainless steel sheet. The support sheet 8 may be rolled up on the reel 7 or unfolded with the unfolding action or the rolling action of the flexible display screen 5. One end of the support sheet 8 is fixed on the reel 7, the other end of the support sheet 8 extends from the opening 101 on the housing 1 and is fixed to the second end 502 of the flexible display screen 5, and the rest of the support sheet 8 is not connected to the flexible display screen 5. The support sheet 8 and the flexible display screen 5 are respectively wound on the reel 7 and the flexible carrier film 4. The axial direction of the reel 7 is parallel to the axial direction of the driving shaft 2 and the driven shaft 3. The width of the support sheet 8 can be consistent with the width of the flexible display screen 5. When the flexible display screen 5 is in the unfolded state, the flexible display screen 5 can be supported by the provided support sheet 8. In an example of this embodiment, the second driving component can be a motor, a torsion spring or a coil spring, etc. The motor is configured to drive the reel 7 to rotate forward or reverse to cooperate with the unfolding or winding action of the support sheet 8. The torsion spring and the coil spring can be configured to undergo elastic deformation during the unfolding process of the support sheet 8, and use their own elastic force to drive the reel 7 to reverse when the support sheet 8 needs to be wound, so that the support sheet 8 is wound. The torsion spring and the coil spring are collectively referred to as elastic members, and the elastic member can be arranged at the end of the reel 7, one end of the elastic member is fixed to the reel 7, and the other end of the elastic member is fixed to the housing 1.

[0039] like Figure 1 , Figure 2As shown, in some exemplary embodiments, the rollable display device further includes a first support plate 11 and a second support plate 12, a first cover 13 and a second cover 14 arranged opposite to each other, and the housing 1 is fixed between the first support plate 11 and the second support plate 12. The driving shaft 2, the driven shaft 3 and the two ends of the scroll 7 can be rotatably arranged on the housing 1 or rotatably arranged on the first support plate 11 and the second support plate 12. The two ends of the scroll 7 and the driving shaft 2 are movable through the housing 1. The first cover 13 can be set as one, the first cover 13 is fixed on the first support plate 11 or the second support plate 12 and is covered on one end of the scroll 7, or the first cover 13 is set as two, the two first covers 13 are respectively fixed on the first support plate 11 and the second support plate 12 and are respectively covered on the two ends of the scroll 7. The second driving component is a torsion spring and is sleeved on the end of the scroll 7, and the two end legs of the torsion spring are respectively fixed on the scroll 7 and the inner wall of the first cover 13. The second driving component can be set only at one end of the scroll 7, or the second driving component can be set at both ends of the scroll 7. The second cover 14 can be provided as one or two. The second cover 14 is provided in the same manner as the first cover 13. The second cover 14 is provided at the end of the drive shaft 2. The first driving component is a torsion spring and is sleeved at the end of the drive shaft 2. The two end legs of the torsion spring are respectively fixed on the drive shaft 2 and the second cover 14. The first driving component can be provided at only one end of the drive shaft 2, or at both ends of the drive shaft 2.

[0040] like Figure 1 , Figure 3As shown, in some exemplary embodiments, the rollable display device further includes a retractable bracket 9 located outside the housing 1, one end of the retractable bracket 9 is fixed to the housing 1 (which may be a position of the housing 1 close to the opening 101), and the other end of the retractable bracket 9 is fixed to the second end 502 of the flexible display screen 5, and the retractable bracket 9 is configured to support the side of the support sheet 8 away from the flexible display screen 5 when the flexible display screen 5 is in the unfolded state. The retractable bracket 9 of this exemplary embodiment gradually unfolds with the flexible display screen 5 during the unfolding process of the flexible display screen 5, and gradually folds with the flexible display screen 5 during the rolling process of the flexible display screen 5. The retractable bracket 9 can support the flexible display screen 5 in the unfolded state. The support sheet 8 is located between the flexible display screen 5 and the retractable bracket 9, and the surface of the support sheet 8 is a flat surface. In this way, when the support surface of the retractable bracket 9 is not flat, the support sheet 8 can provide a flat support surface for supporting the flexible display screen 5 to protect the flexible display screen 5. This exemplary embodiment does not limit the structure of the retractable bracket 9. In an example of this embodiment, the retractable bracket 9 includes a plurality of first connecting rods 901 hinged in sequence and a plurality of second connecting rods 902 hinged in sequence, the first connecting rods 901 and the second connecting rods 902 may both be flat structures, the middle position of each first connecting rod 901 is hinged to the middle position of a corresponding second connecting rod 902, the first connecting rod 901 and the second connecting rod 902 at one end of the retractable bracket 9 are both hinged to the housing 1, and the first connecting rod 901 and the second connecting rod 902 at the other end of the retractable bracket 9 are both hinged to the second end 502 of the flexible display screen 5. The hinged positions of the retractable bracket 9 may all be hinged with hinge shafts.

[0041] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms such as "upper", "lower", "left", "right", "top", "inside", "outside", "axial", and "four corners" are based on the orientations or positional relationships shown in the accompanying drawings. They are only simplified descriptions for the convenience of describing the embodiments of the present application, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

Claims

1. A rollable display device, characterized in that: It comprises a housing, a driving mechanism and a flexible carrier film arranged in the housing, and a flexible display screen; The flexible carrier film is configured to rotate under the drive of the driving mechanism; The first end of the flexible display screen is fixed on the flexible carrier film, and the second end of the flexible display screen is arranged to extend out of the shell from the opening arranged on the shell, and the flexible display screen can be rolled up on the flexible carrier film and can be unfolded under external force; the flexible display screen includes a rolled-up state and an unfolded state, in the rolled-up state, the flexible display screen is rolled up on the flexible carrier film, and the second end of the flexible display screen is located outside the shell, and the second end of the flexible display screen is pulled to switch to the unfolded state; The driving mechanism comprises a driving shaft and a driven shaft rotatably arranged in the housing, and a first driving component capable of driving the driving shaft to rotate, the flexible bearing film is sleeved on the driving shaft and the driven shaft, and is configured to drive the driven shaft to rotate when the driving shaft rotates; A first step is provided on the outer circumferential surface of the driving shaft, a second step is provided on the outer circumferential surface of the driven shaft, two ends of the flexible carrier film are overlapped and fixed, and a first end of the flexible display screen is butted against a first end of the flexible carrier film; The driving mechanism is configured such that when the second end of the flexible carrier film cooperates with one of the first step and the second step, the other of the first step and the second step does not contact the flexible carrier film, and is configured such that when the second end of the flexible carrier film does not contact the driving shaft and the driven shaft, neither the first step nor the second step contacts the flexible carrier film.

2. The rollable display device according to claim 1, wherein: The flexible carrier film is provided with a plurality of transmission parts along the circumferential direction near the edges of both sides, and the driving shaft and the driven shaft are provided with a plurality of transmission matching parts along the circumferential direction near the two ends, and the transmission matching parts are configured to cooperate with the transmission parts for transmission during the rotation of the flexible carrier film.

3. The rollable display device according to claim 2, wherein: The transmission part is a through hole, and the transmission matching part is a protrusion matched with the through hole.

4. The rollable display device according to claim 2, wherein: The width of the flexible display screen is smaller than the width of the flexible carrier film, and the two side edges of the flexible display screen are located between the transmission parts on two sides of the flexible carrier film.

5. The rollable display device according to claim 1, wherein: The heights of the first step and the second step are consistent with the thickness of the flexible carrier film, and the thickness of the flexible carrier film is consistent with the thickness of the flexible display screen.

6. The rollable display device according to claim 1, wherein: The diameter of the outer circumferential surface of the driving shaft gradually increases from the lower position of the first step to the higher position of the first step, and the diameter of the outer circumferential surface of the driven shaft gradually increases from the lower position of the second step to the higher position of the second step.

7. The rollable display device according to claim 1, wherein: The rollable display device further comprises a transmission device disposed between the driving shaft and the driven shaft, and the driving shaft drives the driven shaft to rotate synchronously through the transmission device.

8. The rollable display device according to claim 7, wherein: The transmission device is a gear transmission device, which includes a first gear fixed on the driving shaft, a second gear fixed on the driven shaft, and a third gear rotatably arranged on the housing and meshing with both the first gear and the second gear.

9. The rollable display device according to any one of claims 1 to 8, characterized in that: The rollable display device also includes a scroll rotatably arranged in the shell, a second driving component capable of driving the scroll to rotate, and a support sheet, one end of the support sheet is fixed to the scroll, the other end of the support sheet extends from the opening and is fixed to the second end of the flexible display screen, and the support sheet is configured to be rolled up on the scroll when the flexible display screen is in a rolled-up state, and is configured to be unfolded and supported on a side of the flexible display screen away from the display side when the flexible display screen is in an unfolded state.

10. The rollable display device according to claim 9, wherein: The rollable display device also includes two support plates and a first cover body, the shell is fixed between the two support plates, the two ends of the scroll can move through the shell body, the first cover body is fixed to the support plates and covers the end of the scroll, the second driving component is a torsion spring and is sleeved on the end of the scroll, and the two end feet of the torsion spring are respectively fixed on the scroll and the first cover body.

11. The rollable display device according to claim 9, wherein: The rollable display device also includes a retractable bracket located outside the shell, one end of the retractable bracket is fixed to the shell, and the other end of the retractable bracket is fixed to the second end of the flexible display screen, and the retractable bracket is configured to support the side of the support sheet away from the flexible display screen when the flexible display screen is in an unfolded state.

12. The rollable display device according to claim 11, wherein: The retractable bracket includes a plurality of first connecting rods hinged in sequence and a plurality of second connecting rods hinged in sequence, the middle position of each first connecting rod is hinged to the middle position of a corresponding second connecting rod, the first connecting rod and the second connecting rod located at one end of the retractable bracket are both hinged to the shell, and the first connecting rod and the second connecting rod located at the other end of the retractable bracket are both hinged to the second end of the flexible display screen.

13. The rollable display device according to claim 1, wherein: The rollable display device also includes two support plates and a second cover body, the shell is fixed between the two support plates, the two ends of the drive shaft are movably passed through the shell body, the second cover body is fixed to the support plates and covers the end of the drive shaft, the first driving component is a torsion spring and is sleeved on the end of the drive shaft, and the two end legs of the torsion spring are respectively fixed on the drive shaft and the second cover body.

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