CN113691660B - Electronic equipment and supporting devices thereof - Google Patents

Abstract

The present application mainly relates to an electronic device and a support device thereof, wherein the support device comprises at least one group of rolling structures, each group of rolling structures comprises a plurality of rolling elements arranged at intervals around a reference axial direction, and the plurality of rolling elements are arranged to rotate around respective rotation axes parallel to the reference axial direction, so as to support a flexible display module extending from a first side of the support device around the reference axial direction to a second side of the support device. The support device provided by the present application is provided with a plurality of small rolling elements, which is conducive to reducing the resistance of the flexible display module bypassing the side of the support device during the process of unfolding or folding, and the total space occupied by the plurality of small rolling elements is approximately half of that of a large cylindrical shaft, which is conducive to saving space.

Description

Electronic equipment and supporting devices thereof

Technical Field

The present application relates to the technical field of electronic equipment, and in particular to electronic equipment and a supporting device thereof.

Background technique

With the increasing popularity of electronic devices, they have become an indispensable social and entertainment tool in people's daily lives, and people's requirements for electronic devices are getting higher and higher. Taking electronic devices such as mobile phones as an example, in order to increase product diversity and provide a different user experience, device manufacturers have not only launched mobile phones with full screens and folding screens, but also launched mobile phones with retractable screens.

Summary of the invention

An embodiment of the present application provides a support device for a flexible display module, the support device includes at least one group of rolling structures, each group of rolling structures includes a plurality of rolling elements arranged at intervals around a reference axial direction, and the plurality of rolling elements are arranged to rotate around respective rotation axes parallel to the reference axial direction to support the flexible display module to extend from a first side of the support device around the reference axial direction to a second side of the support device opposite to the first side.

An embodiment of the present application further provides an electronic device, which includes a flexible display module and the supporting device described in the above embodiment, and the flexible display module is laid on the supporting device.

The beneficial effect of the present application is that compared with the related art, the support device provided by the present application is helpful to reduce the resistance of the flexible display module to bypass the side of the support device during the unfolding or folding process by setting a plurality of small rolling elements, and the total space occupied by the plurality of small rolling elements is approximately half of that of a large cylindrical shaft, which is helpful to save space and facilitate the setting of larger capacity batteries or other structural parts.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic structural diagram of an electronic device provided by the present application in one state;

FIG2 is a schematic diagram of the structure of the electronic device in FIG1 in another state;

FIG3 is a schematic diagram of the structure of an electronic device provided by the present application in a state;

FIG4 is a schematic structural diagram of the electronic device in FIG3 in another state;

FIG5 is a schematic structural diagram of an embodiment of the supporting device in FIG3 ;

FIG6 is a schematic diagram of a cross-sectional structure of the electronic device in FIG3 on an XZ plane;

FIG7 is a front view schematic diagram of the structure of the electronic device in FIG3 ;

FIG8 is a front view schematic diagram of the structure of the electronic device in FIG4;

FIG9 is a schematic diagram of the exploded structure of an embodiment of the rolling structure in FIG5 ;

FIG10 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG11 is a schematic diagram of a partial enlarged structure of part A in FIG10;

FIG12 is a schematic diagram of a partial enlarged structure of part B in FIG10;

FIG. 13 is a schematic structural diagram of an embodiment of a rolling structure provided in the present application.

Detailed ways

The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of this application. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

Referring to FIG. 1 and FIG. 2 together, FIG. 1 is a schematic diagram of the structure of an electronic device provided by the present application in one state, and FIG. 2 is a schematic diagram of the structure of the electronic device in FIG. 1 in another state. It should be noted that the state of the electronic device in FIG. 1 may correspond to the folded state described in the present application, and the state of the electronic device in FIG. 2 may correspond to the unfolded state described in the present application. Further, all directional indications in the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in FIG. 1). If the specific posture changes, the directional indication also changes accordingly. Among them, the direction indicated by the arrow X in FIG. 1 can be simply regarded as the telescopic direction described in the present application, the direction indicated by the arrow Y in FIG. 1 can be simply regarded as the reference axis described in the present application, and the direction indicated by the arrow Z in FIG. 1 can be simply regarded as the thickness direction of the electronic device.

In conjunction with FIG. 1 and FIG. 2 , the electronic device 10 may include a flexible display module 11, a housing assembly 12, and a support device 13 assembled together, the flexible display module 11 may be laid on the support device 13, and the housing assembly 12 may be connected to the support device 13. Among them, the housing assembly 12 is configured to protect the electronic device 10 at least in the folded state, and the support device 13 is configured to move back and forth between the unfolded state (for example, as shown in FIG. 2 ) and the folded state (for example, as shown in FIG. 1 ) along the telescopic direction (for example, the direction shown by X in FIG. 1 ), that is, the size of the support device 13 in the telescopic direction is variable to support the flexible display module 11 to switch between the unfolded state and the folded state. Of course, the flexible display module 11 may also be laid on the housing assembly 12.

It should be noted that: whether in the folded state or the unfolded state, the flexible display module 11 can have a certain tension so as to be laid flat on the support device 13. Of course, magnetic suction parts with different polarities can also be provided on the support device 13 and the flexible display module 11, so that the flexible display module 11 and the support device 13 are magnetically adsorbed to each other in the unfolded state or the folded state, and the flexible display module 11 can also be laid flat on the support device 13. Further, the shell assembly 12 can be used as a part of the structure of the support device 13, or the support device 13 can be used as a part of the structure of the shell assembly 12, or only one of the shell assembly 12 and the support device 13 exists.

Generally, the flexible display module 11 can be a display screen such as LCD (Liquid Crystal Display), or a display screen such as OLED (Organic Light Emitting Diode), QLED (Quantum Dot Light Emitting Diode), or a display screen such as Mini-LED or Micro-LED. In this application, the flexible display module 11 is an OLED display screen as an example for exemplary description.

As an example, the housing assembly 12 may include a first housing 121 and a second housing 122, and the first housing 121 and the second housing 122 may be connected to the two ends of the support device 13 in a one-to-one correspondence, so that the first housing 121 and the second housing 122 can be separated from each other as the electronic device 10 is unfolded, and can be close to each other as the electronic device 10 is folded. The first housing 121 and the second housing 122 can be spliced in the folded state to prevent foreign objects from invading the interior of the electronic device 10.

Generally, for conventional electronic devices equipped with full screens or folding screens, the volume of the electronic devices is generally fixed. However, for electronic devices equipped with retractable screens, the volume of the electronic devices will increase or decrease accordingly as the unfolded state or the folded state is switched. At this time, in the process of unfolding or retracting the electronic device 10, the housing assembly 12 is preferably able to undergo structural changes accordingly, so as to protect the internal structure of the electronic device 10. To this end, the housing assembly 12 may also include a third housing connected to at least one of the first housing 121 and the second housing 122, and the third housing is arranged to be partially staggered with the first housing 121 and the second housing 122 in the unfolded state to fill the gap between the first housing 121 and the second housing 122, so that the electronic device 10 can be protected by the housing assembly 12 under any circumstances. Among them, the third housing can be a thin film structure with a certain structural strength, or it can be a plurality of intermediate housings that are movably connected to each other and partially stacked, so as to unfold (or fold) with the unfolding of the electronic device 10.

In conjunction with Figures 3 to 6, Figure 3 is a schematic diagram of the structure of the electronic device provided by the present application in one state, Figure 4 is a schematic diagram of the structure of the electronic device in Figure 3 in another state, Figure 5 is a schematic diagram of the structure of an embodiment of the supporting device in Figure 3, and Figure 6 is a schematic diagram of the cross-sectional structure of the electronic device in Figure 3 on the XZ plane. It should be noted that the state of the electronic device in Figure 3 may correspond to the folded state described in the present application, and the state of the electronic device in Figure 4 may correspond to the unfolded state described in the present application. Furthermore, for the sake of ease of description, compared with the electronic device shown in Figure 1, the electronic device shown in Figure 3 hides some structures, such as the second shell, which does not mean that these hidden structures do not exist.

As an example, in combination with Figures 5 and 6, the supporting device 13 may include a first supporting member 131 and a second supporting member 132 connected to the first supporting member 131, and the second supporting member 132 is configured to move back and forth relative to the first supporting member 131 along the telescopic direction (for example, the direction indicated by X in Figure 1) to achieve variable size of the supporting device 13 in the telescopic direction, thereby supporting the flexible display module 11 to switch between the expanded state and the folded state.

As an example, the first support member 131 and the second support member 132 can be slidably matched, and the first shell 121 can be connected to the first support member 131, and the second shell 122 can be connected to the second support member 132. At this time, the reciprocating movement of the second support member 132 relative to the first support member 131 along the telescopic direction can be achieved by the user applying an external force to the first shell 121 and the second shell 122, or by an additional driving structure driving the second support member 132, which will be explained exemplarily below.

It should be noted that: the second support member 132 and the second shell 122 can be provided in two groups respectively, and are respectively located at the two ends of the first support member 131 and the first shell 121 along the telescopic direction, so that the electronic device 10 can be expanded left and right along the telescopic direction (with the middle area where the first support member 131 is located as a reference). Further, in conjunction with Figure 8, since the first support member 131 and the first shell 121 can be considered to remain stationary, other structural parts such as the battery 14, the mainboard 15 and the camera module 16 can also be set in the area where the first support member 131 is located in the electronic device 10 to achieve corresponding functions.

Based on the basic structure of the telescopic screen, and in combination with Figures 3 and 4, the flexible display module 11 generally extends from the first side of the support device 13 around the second support member 132 away from the free end of the first support member 131 to the second side of the support device 13, so as to realize the variable size of the display screen. Among them, the first side described in the application can be a side of the electronic device 10 displaying the screen (or the user interacting with it), and the second side can be opposite to the first side in the thickness direction of the electronic device 10 (for example, the direction shown by Z in Figure 1). In short, the first side and the second side can correspond to the "front" and "back" of the electronic device 10, respectively. In addition, the end surface of the free end of the second support member 132 between the first side and the second side (that is, a side of the electronic device 10 along the telescopic direction) is generally arranged in an arc shape to effectively support the flexible display module 11 and avoid structural failure of the flexible display module 11 due to transition bending. Obviously, the friction caused by the flexible display module 11 bypassing the free end of the second support member 132 during the process of the electronic device 10 being unfolded or folded will not only affect the resistance of the electronic device 10 during the unfolding or folding process, but also affect the degree of wear of the flexible display module 11, especially when the flexible display module 11 also has a certain tension during the unfolding or folding process. To this end, the free end of the second support member 132 can be provided with a cylindrical shaft that is rotatable relative to the second support member 132, and the flexible display module 11 is supported on the cylindrical shaft, so that the flexible display module 11 and the second support member 132 are rolling friction, thereby replacing the sliding friction in the related art, which is conducive to reducing the resistance of the flexible display module 11 bypassing the free end of the second support member 132 during the unfolding or folding process of the electronic device 10, reducing the wear of the flexible display module 11, and extending the reliability and service life.

In conjunction with FIG. 5 and FIG. 6 , the support device 13 may further include at least one group of rolling structures 133, and the rolling structure 133 may be arranged at the free end of the second support member 132 away from the first support member 131, so that the flexible display module 11 can bypass the free end of the second support member 132 by rolling friction. Wherein, each group of rolling structures 133 may include a plurality of rolling members 1331, such as two, three, etc., arranged at intervals around a reference axis (e.g., the direction shown in Y in FIG. 1 ), and the plurality of rolling members 1331 are arranged to rotate around respective rotation axes parallel to the reference axis. Wherein, the present application takes the example that each group of rolling structures 133 is arranged with four rolling members 1331 at intervals around the reference axis as an example for exemplary description. Further, the plurality of rolling members 1331 support the flexible display module 11 to extend from the first side of the support device 13 around the reference axis to the second side of the support device 13.

In this way, the present application is not only conducive to reducing the resistance of the flexible display module 11 to bypass the free end of the second support member 132 during the process of unfolding or folding the electronic device 10, but also saves more space than the above-mentioned cylindrical shaft, which is conducive to the electronic device 10 to be provided with a battery or other structural member with a larger capacity. This is because, at any moment during the process of unfolding or folding the electronic device 10, only a part of the above-mentioned cylindrical shaft (for example, half of the cylinder along the axial direction) can support the flexible display module 11, while the remaining other part cannot support the flexible display module 11 but occupies additional space. Different from this, in combination with Figure 6, the rolling structure 133 in the present application is equivalent to occupying only half of the space where the above-mentioned cylindrical shaft is located, so as to allow the first support member 131 and the battery 14 and/or mainboard 15 fixed thereon to be located as much as possible in the other half of the space where the above-mentioned cylindrical shaft is located in the folded state, that is, the battery 14 and/or mainboard 15 can be made larger.

As an example, in conjunction with FIG6 , the rotation axes of the multiple rolling elements 1331 are located on the same arc (such as shown by the dotted line in FIG6 ) on a reference plane (such as the XZ plane) perpendicular to the reference axis, and the central angle corresponding to the arc is less than or equal to 180°, such as 180°, 175°, 170°, etc., and the specific preferred angle can be selected according to actual needs to make the support surface formed by the multiple rolling elements 1331 as smooth as possible. Among them, the first and last two of the multiple rolling elements 1331 can be spaced apart on the thickness of the electronic device 10 (such as the direction shown in Z in FIG1 ), and the line between the two can intersect the reference axis, so as to allow the portions of the flexible display module 11 corresponding to the first side and the second side to be tangent to the portions corresponding to one side of the electronic device 10, respectively.

In some embodiments, in combination with FIG. 5 and FIG. 9 , the rolling structure 133 may be arranged in multiple groups along the reference axial direction, such as two groups, three groups, etc. Among them, the present application takes the rolling structure 133 as an example of arranging seven groups along the reference axial direction. In this way, the flexible display module 11 can be supported, and the total weight of the rolling structure 133 can be reduced, which is conducive to the thin and light design of the electronic device 10. At this time, each rolling member 1331 can partially protrude from the free end of the second support member 132 to allow the second support member 132 to support the flexible display module 11 when the side of the electronic device 10 is compressed, so as to avoid structural failure of the flexible display module 11. Among them, since the size of the rolling member 1331 along the reference axial direction is small, for example, equal to the size of the matching portion 13331 of the rotating shaft 133 along the reference axial direction, the rolling member 1331 can also be called a "roller".

In some other embodiments, in combination with FIG. 13 and FIG. 5 , the rolling structure 133 may be provided in only one group, wherein each rolling member 1331 may penetrate the support device 13 along the reference axis. For example, the two ends of each rolling member 1331 are directly connected to the two limiting portions 1322 of the second support member 132 that are arranged opposite to each other along the reference axis; for another example, the two ends of each rolling member 1331 are connected to the two limiting portions 1322 of the second support member 132 that are arranged opposite to each other along the reference axis through a sub-bracket 1334, wherein the sub-bracket 1334 may also be provided with a rotating shaft 1333 in a cantilever manner for the rolling structure 1331 to rotate. At this time, each rolling member 1331 may partially protrude from the free end of the second support member 132, or may completely protrude or not protrude from the free end of the second support member 132, and may also support the flexible display module 11 to avoid structural failure. Among them, since the dimension of the rolling element 1331 along the reference axis is relatively large, for example, larger than the dimension of the matching portion 13331 of the rotating shaft 133 along the reference axis, the rolling element 1331 can also be called a "roller".

In conjunction with FIG5 , the second support member 132 may include a fixing portion 1321 and a limiting portion 1322 and a supporting portion 1323 connected to the fixing portion 1321. The fixing portion 1321 may be located at the free end of the second support member 132 away from the first support member 131, and may be provided with a mounting groove for accommodating the rolling structure 133, so as to facilitate the setting of the rolling structure 133, that is, the rolling structure 133 is connected to the fixing portion 1321. The supporting portion 1323 may face the flexible display module 11 along the thickness direction of the electronic device 10, and may be mounted on the first support member 131, so that the second support member 132 and the first support member 131 jointly support the flexible display module 11. Further, two limiting portions 1322 may be provided at intervals along the reference axial direction, and the supporting portion 1323 and the first support member 131 may be located between the two limiting portions 1322 to limit the reciprocating movement of the second support member 132 relative to the first support member 131 along the telescopic direction.

Furthermore, a plurality of support portions 1323 may be arranged at intervals along the reference axis, for example, two, three, etc. Among them, the present application takes the example of the second support member 132 being provided with twelve support portions 1323 at intervals along the reference axis as an exemplary description. Correspondingly, the first support member 131 may also be provided with an avoidance groove (that is, the area where the support portion 1323 is located) corresponding one to one with the support portion 1323. At this time, the avoidance groove provided on the first support member 131 also forms a plurality of support portions 1311 arranged at intervals along the reference direction. In other words, the support portion 1311 on the first support member 131 and the support portion 1323 on the second support member 132 are spaced from each other in the reference axis so as to reduce the total weight of the support device 13 while supporting the flexible display module 11.

Referring to FIG. 7 and FIG. 8 , FIG. 7 is a front view schematic diagram of the structure of the electronic device in FIG. 3 , and FIG. 8 is a front view schematic diagram of the structure of the electronic device in FIG. 4 .

Based on the above description, the flexible display module 11 may have a certain tension so that it is always laid flat on the support device 13. Based on this, the support device 13 may also include a tensioning structure 134 connected to at least one of the first support member 131 and the second support member 132, and the tensioning structure 134 is configured to maintain the contact between the flexible display module 11 and the rolling member 1331. For example, the tensioning structure 134 is arranged on the second support member 132 and abuts against the flexible display module 11 located on the second side of the support device 13, so that the flexible display module 11 has a certain tension.

As an example, in combination with FIG. 7 and FIG. 8 , the tensioning structure 134 may include a steering wheel 1341 and a tensioning rope 1342. The steering wheel 1341 may be disposed at the other end of the second support member 132 away from its free end, for example, the steering wheel 1341 is connected to one end of the limiting portion 1322 away from the fixing portion 1321, and the two ends of the tensioning rope 1342 may be respectively connected to the first support member 131 and the flexible display module 11 located on the second side of the support device 13, and wound around the steering wheel 1341. The tensioning rope 1342 may always be in a stretched state, that is, it may store a certain amount of elastic potential energy to tighten one end of the flexible display module 11, thereby allowing the flexible display module 11 to be laid flat on the support device 13 and maintaining contact between the flexible display module 11 and the rolling member 1331. Moreover, the tensioning structure 134 described in the present application can also replace the hinge mechanism used in the related art to roll up the flexible display module 11 during the folding process of the electronic device 10. The flexible display module 11 does not need to be rolled together, thereby greatly reducing the bending of the flexible display module 11 and simplifying the structure of the electronic device 10.

It should be noted that a tensioning structure 134 can be respectively provided on the opposite sides of the support device 13 along the reference axis. For example, each limiting portion 1322 is connected to a steering wheel 1341 and a corresponding tensioning rope 1342 to tighten the flexible display module 11 from both sides of the electronic device 10, thereby increasing the uniformity of the force.

Please refer to FIG. 9 , which is a schematic diagram of the exploded structure of an embodiment of the rolling structure in FIG. 5 .

9 , the rolling structure 133 may include a rolling member 1331, a bracket 1332 and a rotating shaft 1333, and each rolling member 1331 may be connected to the bracket 1332 via a corresponding rotating shaft 1333. The rotation axis of each rotating shaft 1333 may be parallel to the reference axis. In this way, the rolling structure 133 may be connected to the second support member 132 via the bracket 1332.

As an example, the bracket 1332 may include two sub-brackets 1334 spaced apart along the reference axial direction, and the two ends of each rotating shaft 1333 may be connected to the two sub-brackets 1334 respectively, and the rolling element 1331 may be sleeved on the rotating shaft 1333. Among them, the sub-bracket 1334 may include a bracket connecting portion 13341 and a bracket supporting portion 13342 connected in one piece, and the sub-bracket 1334 is connected to the fixing portion 1321 through the bracket connecting portion 13341, and the bracket supporting portion 13342 may be arranged in a semicircular ring along the reference axial direction. Based on the above-mentioned related description, four mounting holes for mounting the rotating shaft 1333 may be provided on the bracket supporting portion 13342, and the four mounting holes may be located in pairs on opposite sides of the bracket connecting portion 13341. Further, the rotating shaft 1333 may include a matching portion 13331 and a connecting portion 13332 that are connected in an integral manner, the matching portion 13331 may be clearance-matched with the rolling element 1331, and the connecting portion 13332 is located at both ends of the matching portion 13331 and may be respectively embedded in corresponding mounting holes on the bracket support portion 13342. In short, the number of the rotating shafts 1333 may be the same as the number of the rolling elements 1331, that is, one rolling element 1331 is connected to the bracket 1332 via one rotating shaft 1333. Of course, in some other embodiments, in conjunction with FIG. 13 , the number of the rotating shafts 1333 may also be twice that of the rolling elements 1331, that is, one rolling element 1331 is connected to the bracket 1332 via two rotating shafts 1333.

Referring to Figures 10 to 12 together, Figure 10 is a schematic diagram of the structure of an embodiment of an electronic device provided in the present application, Figure 11 is a partially enlarged schematic diagram of the structure of part A in Figure 10, and Figure 12 is a partially enlarged schematic diagram of the structure of part B in Figure 10. It should be noted that: compared with the electronic device shown in Figure 1 or Figure 3, the electronic device shown in Figure 10 can be the other side thereof, for example, the former mainly illustrates the front of the electronic device and the latter mainly illustrates the back of the electronic device. Furthermore, for the convenience of description, similar to the electronic device shown in Figure 3, the electronic device shown in Figure 10 also hides some structures, such as the second shell, which does not mean that these hidden structures do not exist.

Based on the above description, the support device 13 may further include a driving structure 135, which is configured to drive the second support member 132 to move back and forth relative to the first support member 131 along the telescopic direction. For example, the driving structure 135 is based on the electromagnetic driving principle, thereby supporting the flexible display module 11 to switch between the expanded state and the folded state.

As an example, and in combination with Figures 10 to 12, the driving structure 135 may include a rack 1351, a gear 1352 and a motor 1353. The rack 1351 may be connected to the second support member 132 (e.g., the fixing portion 1321), the gear 1352 may be meshed with the rack 1351, and may be connected to the output shaft of the motor 1353, and the housing of the motor 1353 may be connected to the first support member 131. In this way, when the motor 1353 rotates forward or reversely, the gear 1352 may drive the rack 1351 to extend or retract the first support member 131 along the telescopic direction, thereby driving the second support member 132 to reciprocate relative to the first support member 131 along the telescopic direction, and at the same time supporting the flexible display module 11 to switch between the extended state and the retracted state.

Furthermore, a plurality of racks 1351 and gears 1352 are respectively arranged at intervals along the reference axial direction, for example, two, three, etc., so as to increase the stability of the reciprocating motion of the second support member 132 relative to the first support member 131 along the telescopic direction. Among them, the present application takes the example of two racks 1351 being arranged at intervals along the reference axial direction, and two gears 1352 being arranged at intervals along the reference axial direction as an example for exemplary description. At this time, the driving structure 135 may also include a transmission shaft 1354 connected to the output shaft of the motor 1353, and the gears 1352 are meshed one by one with the racks 1351, and are both connected to the transmission shaft 1354. In other words, one motor 1353 can drive all the gears 1352 to rotate through the transmission shaft 1354, thereby driving all the racks 1351 to extend or retract the first support member 131 along the telescopic direction.

The above descriptions are only some embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims (13)

1. A support device for a flexible display module, the support device comprising at least one set of rolling structures, a first support and a second support connected to the first support, each set of rolling structures comprising a plurality of rolling members arranged at intervals about a reference axis, the plurality of rolling members being arranged to rotate about respective axes of rotation parallel to the reference axis to support the flexible display module from a first side of the support device extending about the reference axis to a second side of the support device opposite the first side; the second supporting piece is arranged to move back and forth relative to the first supporting piece along the telescopic direction so as to support the flexible display module to switch between the unfolding state and the folding state, and the rolling structure is arranged at the free end of the second supporting piece far away from the first supporting piece, so that the flexible display module bypasses the free end of the second supporting piece in a rolling friction mode.

2. The supporting device according to claim 1, wherein the rotation axes of the plurality of rolling elements are located on the same circular arc on a reference plane perpendicular to the reference axis, and a central angle corresponding to the circular arc is smaller than or equal to 180 °.

3. The support device of claim 1, wherein the rolling structures are arranged in a plurality of groups spaced apart along the reference axis.

4. A support device according to claim 3, wherein the rolling structure comprises a bracket and a plurality of shafts, each rolling element being connected to the bracket by a respective shaft.

5. The support device according to claim 4, wherein the bracket comprises two sub-brackets arranged at intervals along the reference axis, two ends of each rotating shaft are respectively connected with the two sub-brackets, and the rolling element is sleeved on the rotating shaft.

6. The support device of claim 1, further comprising a tensioning structure connected to at least one of the first support and the second support, the tensioning structure configured to maintain contact between the flexible display module and the rolling member.

7. The support device of claim 6, wherein the tensioning structure comprises a steering wheel and a tensioning rope, the steering wheel is arranged at the other end of the second support piece far away from the free end of the second support piece, and two ends of the tensioning rope are respectively connected with the first support piece and the flexible display module located on the second side and are wound on the steering wheel.

8. The support device according to claim 7, wherein the second support member includes a fixing portion, and a limiting portion and a support portion connected to the fixing portion, the limiting portion is disposed two at intervals along the reference axis, the support portion and the first support member are disposed between the two limiting portions, the support portion is erected on the first support member, the steering wheel is connected to the limiting portion, and the rolling structure is connected to the fixing portion.

9. The supporting device according to claim 8, wherein a plurality of supporting portions are arranged at intervals along the reference axial direction, and the first supporting member is provided with avoiding grooves corresponding to the supporting portions one by one.

10. The support device of claim 1, further comprising a drive structure configured to drive the second support member in the telescoping direction to and fro relative to the first support member.

11. The support device of claim 10, wherein the drive structure comprises a rack, a pinion, and a motor, the rack being coupled to the second support, the pinion being meshed with the rack and coupled to an output shaft of the motor, a housing of the motor being coupled to the first support.

12. The support device of claim 11, wherein the rack and the gear are respectively provided in plural at intervals along the reference axis, the driving structure further comprises a transmission shaft connected to an output shaft of the motor, and the gears are engaged with the rack one by one and connected to the transmission shaft.

13. An electronic device comprising a flexible display module and the support device of any one of claims 1-12, the flexible display module being laid on the support device.