Rollable display device

Abstract

A rollable display device is provided, belonging to the field of display technology. The rollable display device includes a roller and a display module. The roller has a polygonal cross-section, and its outer peripheral wall includes multiple circumferentially arranged planar areas. One end of the display module is connected to the roller, and the display module can be rolled up and unrolled around the roller. The display module includes a flexible display panel and a support structure. The support structure is located on the back of the flexible display panel and includes a first support member. The first support member includes multiple first and second support portions alternately arranged in the winding direction of the display module, and the modulus of the first support portion is greater than that of the second support portion. When the display module is rolled up around the roller, it forms multiple loops, each loop having a polygonal winding cross-section. The first support portion is located in a planar area of ​​the roller, and the second support portion is located at the connection point of two adjacent planar areas of the polygon. This design helps reduce the stress on the display module in the rolled-up state.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a rollable display device. Background Technology

[0002] Currently, research and development of flexible display devices are receiving increasing attention, such as rollable and foldable display devices. Rollable display devices include a scroll and a display module. One end of the display module is connected to the scroll, and the display module can be unfolded and rolled up around the scroll. When the display module is unfolded, the display area increases; when the display module is rolled up, its volume is smaller, thus increasing portability.

[0003] When the display module is wound up, it usually forms multiple coils around the spool. Each coil has a circular winding cross section, resulting in relatively high winding stress. Utility Model Content

[0004] This disclosure provides a rollable display device that can reduce the stress on the display module in the rolled-up state. The technical solution is as follows:

[0005] In a first aspect, embodiments of this disclosure provide a rollable display device, the rollable display device comprising a scroll and a display module, the scroll having a polygonal cross-section, and the outer peripheral wall of the scroll comprising a plurality of planar areas arranged circumferentially along the scroll; one end of the display module is connected to the scroll and the display module is capable of being rolled up and unrolled around the scroll; the display module comprises a flexible display panel and a support structure, the support structure being located on the back side of the flexible display panel and connected to the flexible display panel, the support structure comprising a first support member, the first support member comprising a plurality of first support portions and a plurality of second support portions, the plurality of first support portions and the plurality of second support portions being alternately arranged in the winding direction of the display module, and the modulus of the first support portion being greater than the modulus of the second support portion; when the display module is rolled up around the scroll, the display module forms a plurality of loops around the scroll, each loop having a polygonal winding cross-section perpendicular to the length direction of the scroll, the first support portion being located in the planar area of ​​the scroll, and the second support portion being located at the connection point of two adjacent planar areas.

[0006] Optionally, the first support portion includes multiple first support bars and multiple first connecting rib groups arranged parallel to each other along the winding direction. Each first connecting rib group is located between two adjacent first support bars. Each first connecting rib group includes multiple first connecting ribs arranged at intervals along the width direction. At least one first connecting rib has its two ends connected to the first support bars on both sides. The width direction is perpendicular to the winding direction. The second support portion includes multiple second support bars and multiple second connecting rib groups arranged parallel to each other along the winding direction. Each second connecting rib group is located between two adjacent second support bars. Each second connecting rib group includes multiple second connecting ribs arranged at intervals along the width direction. At least one second connecting rib has its two ends connected to the second support bars on both sides. The number of second connecting ribs in the second connecting rib group is less than the number of first connecting ribs in the first connecting rib group.

[0007] Optionally, the first support member further includes a plurality of third support portions, which are connected between adjacent first support portions and second support portions. The modulus of the third support portion is less than that of the first support portion and greater than that of the second support portion.

[0008] Optionally, the third support portion includes multiple third support bars and multiple third connecting rib groups arranged parallel to each other along the winding direction. Each third connecting rib group is located between two adjacent third support bars. Each third connecting rib group includes multiple third connecting ribs arranged at intervals along the width direction. At least one third connecting rib has its two ends connected to the third support bars on both sides. The number of connecting ribs in the third connecting rib group is greater than the number of second connecting ribs in the second connecting rib group and less than the number of first connecting ribs in the first connecting rib group.

[0009] Optionally, in the winding cross section, the included angle between any two adjacent sides is equal.

[0010] Optionally, the connection between any two adjacent sides in the winding cross section is rounded.

[0011] Optionally, the bending radius at the connection of two adjacent sides in the first coil is less than or equal to the bending radius at the connection of two adjacent sides in the second coil, and any two adjacent coils of the first coil and the second coil are located closer to the reel than the second coil.

[0012] Optionally, along a direction away from the spool, the side lengths of corresponding planar regions in the winding cross-sections of the plurality of coils are equal or increasing.

[0013] Optionally, the bending radius at the junction of two adjacent sides in each coil satisfies the following formula:

[0014] Rk-1=R min +(k-1)t;

[0015] Where k-1 represents the k-th coil in the radially outward direction of the spool, R k-1 R represents the bending radius of the k-th coil, where k is a positive integer greater than 1. min The radius of curvature is represented at the junction of two adjacent sides in the first coil, and t represents the sum of the module thickness and the spacing between adjacent coils.

[0016] Optionally, the first support member further includes a connecting portion located on one side of the plurality of first support portions and the plurality of second support portions in the winding direction, and the connecting portion is fixedly connected to the reel;

[0017] When the display module is unfolded, the orthographic projection of the first side of the flexible display panel onto the first support member is located outside the connecting portion, or the orthographic projection of the first side of the flexible display panel onto the first support member is located inside the connecting portion; wherein, the first side of the flexible display panel is the side of the flexible display panel closest to the scroll.

[0018] Optionally, the connecting portion includes multiple connecting strips that are arranged parallel to each other and not connected along the winding direction.

[0019] Optionally, the support structure further includes a second support member located between the first support member and the back of the flexible display panel.

[0020] Optionally, the second support member is a perforated metal layer or a non-perforated metal layer.

[0021] Optionally, the support structure further includes a protective layer located on the side of the first support member away from the flexible display panel.

[0022] Optionally, the protective layer includes at least one of a foam layer and a thermoplastic polyurethane layer.

[0023] Optionally, the scroll includes: a shaft and a housing, the housing being connected to the shaft and defining a first accommodating space between the housing and the shaft, a gap between one side of the housing and the shaft, one end of the display module being located in the first accommodating space, a portion of the display module being located in the gap, and the portion of the display module located in the gap being sandwiched between the housing and the shaft.

[0024] Optionally, the rollable display device further includes a flexible circuit board and a printed circuit board, the printed circuit board being located in the first accommodating space and connected to the shaft; the flexible circuit board being connected between the flexible display panel and the printed circuit board, and being located in the first accommodating space.

[0025] Optionally, the support structure has a clearance opening at one end near the scroll, and the rollable display device further includes a fixing member that passes through the housing and is connected to the shaft, with the middle part of the fixing member located in the clearance opening.

[0026] Optionally, the flexible display panel includes a substrate, a display functional layer, and a touch functional layer, wherein the display functional layer and the touch functional layer are sequentially stacked on the surface of the substrate.

[0027] Secondly, embodiments of this disclosure provide a rollable display device, comprising a scroll and a display module. One end of the display module is connected to the scroll, and the display module is capable of being rolled up and unrolled around the scroll. The display module includes a flexible display panel and a support structure. The support structure is located on the back side of the flexible display panel and connected to the back side of the flexible display panel. The outer contour of the cross-section of the scroll is polygonal. When the display module is rolled up around the scroll, the winding cross-section of the display module is a polygon matching the outer contour of the cross-section. Both the cross-section and the winding cross-section are perpendicular to the length direction of the scroll. The support structure includes a first support member, which includes a connecting portion and a winding portion connected together. The connecting portion is connected to the scroll, and the winding portion is capable of being rolled up or unrolled around the scroll. The modulus of the winding portion is greater than the modulus of the connecting portion.

[0028] Optionally, the connecting portion includes multiple connecting strips that are arranged parallel to each other and not connected along the winding direction of the display module.

[0029] Optionally, the winding section includes multiple fourth support bars arranged at parallel intervals along the winding direction of the display module.

[0030] Optionally, the winding section further includes a plurality of fourth connecting rib groups, wherein the plurality of fourth support bars are arranged parallel to each other at intervals along the winding direction of the display module, each fourth connecting rib group includes at least one fourth connecting rib, and at least one fourth connecting rib in the fourth connecting rib group is connected to two adjacent fourth support bars.

[0031] Optionally, the modulus of the winding portion remains constant in the winding direction of the display module.

[0032] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0033] Because the outer wall of the reel comprises multiple planar areas arranged circumferentially along the reel, the winding cross-section of the display module is also polygonal when it is wound around the reel. Furthermore, the first support portion is located in a planar area, forming a flat structure with no stress accumulation, which helps reduce stress on the display module during winding. Additionally, the second support portion is located at the junction of two adjacent planar areas, i.e., at the bend, ensuring that the modulus of the second support portion is less than that of the first support portion. This allows the display module to maintain good bending performance at the bend and good support performance at the flat area. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the unfolded state of a rollable display device provided in an embodiment of this disclosure;

[0036] Figure 2 This is a schematic diagram of the winding state of a rollable display device provided in an embodiment of this disclosure;

[0037] Figure 3 This is a schematic diagram of a partial cross-sectional structure of a reel provided in an embodiment of this disclosure;

[0038] Figure 4 This is a three-dimensional structural diagram of a scroll provided in an embodiment of this disclosure;

[0039] Figure 5 This is a partial cross-sectional structural diagram of the display module provided in an embodiment of this disclosure;

[0040] Figure 6 This is a schematic diagram of the unfolded structure of a first support member provided in an embodiment of this disclosure;

[0041] Figure 7 yes Figure 6 A partially enlarged structural diagram;

[0042] Figure 8 yes Figure 7 A partially enlarged structural diagram;

[0043] Figure 9 yes Figure 8 A schematic diagram of the torsion strip gradient structure;

[0044] Figure 10This is a schematic diagram of the winding state of another rollable display device provided in this embodiment of the present disclosure;

[0045] Figure 11 yes Figure 10 A cross-sectional diagram of one of the roll segments;

[0046] Figure 12 This is an exploded view of a support structure provided in an embodiment of this disclosure;

[0047] Figure 13 This is a schematic diagram of a planar structure of a support structure provided in an embodiment of this disclosure;

[0048] Figure 14 This is a schematic diagram of the structure of a first support member provided in an embodiment of this disclosure;

[0049] Figure 15 This is a schematic diagram of the structure of a first support member provided in an embodiment of this disclosure;

[0050] Figure 16 This is a schematic diagram of the structure of a first support member provided in an embodiment of this disclosure.

[0051] Figure Labels

[0052] Scroll 1; Display module 2;

[0053] Shaft 1a; Housing 1b; First accommodating space 1c;

[0054] Planar area 11; Arc area 12; Connecting shaft 13;

[0055] Flexible display panel 21; First side 211;

[0056] Support structure 22; clearance opening 22a;

[0057] 23. Flexible circuit board; 24. Printed circuit board;

[0058] First adhesive layer 221; second support member 222; second adhesive layer 223; first support member 224; protective layer 225;

[0059] First support portion 224a; second support portion 224b; third support portion 224c; connecting portion 224d; winding portion 224e;

[0060] First sub-support part 2241; Second sub-support part 2242;

[0061] Curl 1 31; Curl 2 32; Curl 3 33;

[0062] First support bar 41; Second support bar 42; Third support bar 43; Connecting bar 44; Fourth support bar 45;

[0063] First connecting bar group 51; Second connecting bar group 52; Third connecting bar group 53; Fourth connecting bar group 55;

[0064] First connecting bar 511; Second connecting bar 521; Third connecting bar 531; Fourth connecting bar 551;

[0065] First twist bar 61; second twist bar 62; third twist bar 63; fourth twist bar 64. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0067] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0068] Figure 1 This is a schematic diagram of the unfolded state of a rollable display device provided in an embodiment of this disclosure. Figure 2 This is a schematic diagram of the rolled-up state of a rollable display device provided in an embodiment of this disclosure. (In conjunction with...) Figure 1 and Figure 2 The rollable display device includes a scroll 1 and a display module 2, one end of which is connected to the scroll 1. The display module 2 can be wound up and unwound around the scroll 1, wherein the X direction is the winding direction of the display module 2 and the Y direction is the width direction of the display module 2.

[0069] When the display module 2 is in the rolled-up state, the display device is small in size and easy to carry. When the display module 2 is in the unfolded state, its display area is large, which helps to improve the viewing experience. The area of ​​the display area in the unfolded state can be set according to actual needs, and this embodiment does not limit it. For example, the area of ​​the display area can reach 15 inches or 17 inches.

[0070] Figure 3 This is a schematic diagram of a partial cross-sectional structure of a reel provided in an embodiment of this disclosure. Figure 4 This is a three-dimensional structural diagram of a scroll provided in an embodiment of this disclosure. (In conjunction with...) Figure 3 and Figure 4 Scroll 1 is a cylinder. The cross-section of scroll 1 is polygonal, and the cross-section of scroll 1 is perpendicular to the length direction of scroll 1. The length direction of scroll 1 is parallel to the width direction Y.

[0071] In this embodiment of the disclosure, the cross-section of the scroll 1 is polygonal, meaning that the outer peripheral wall of the column includes a plurality of planar regions 11 arranged circumferentially along the scroll 1.

[0072] For example, the outer peripheral wall of the scroll 1 includes a plurality of planar areas 11 and a plurality of arc areas 12 arranged alternately along the circumference of the scroll 1. Two adjacent planar areas 11 are connected by arc areas 12. Compared with two adjacent planar areas 11 being directly connected, this can improve the problem of appearance defects such as mold marks that are prone to occur at the tip of the display module and avoid damage to the display module wound on the scroll 1.

[0073] For example, such as Figure 3 As shown, the cross-section of scroll 1 is hexagonal. Optionally, the cross-section of scroll 1 can be a regular polygon or a non-regular polygon.

[0074] Optionally, two connecting shafts 13 are coaxially connected to both ends of the scroll 1 to facilitate the rotatable connection of the scroll 1 with other structures (e.g., housing).

[0075] Figure 5 This is a partial cross-sectional structural diagram of the display module provided in an embodiment of this disclosure. (Combined with...) Figure 1 and Figure 5 The display module 2 includes a flexible display panel 21 and a support structure 22. The support structure 22 is located on the back side of the flexible display panel 21 and is connected to the flexible display panel 21. The support structure 22 includes a first support member 224. The flexible display panel 21 has a display surface for displaying images. The back side of the flexible display panel 21 is the surface of the flexible display panel 21 opposite to the display surface.

[0076] See Figure 2When the display module 2 is wound around the spool 1, the display module 2 forms multiple coils 3 around the spool 1. The winding cross section of each coil is polygonal and perpendicular to the length direction of the spool 1. For example, the display module 2 forms three coils 3 around the spool 1, namely coil one 31, coil two 32 and coil three 33.

[0077] When the display module 2 is wound around the reel 1, each coil includes a plurality of consecutive first support portions 224a and a plurality of second support portions 224b. Each first support portion 224a is located on one side of the polygon formed by the winding cross section of the coil. Figure 3 A planar region 11. Each second support 224b is located at the junction of two adjacent sides of the polygon formed by the winding cross section of the coil. Figure 3 One of the circular arc areas is 12.

[0078] Figure 6 This is a schematic diagram of the unfolded structure of a first support member provided in an embodiment of this disclosure. Figure 6 As shown, coil 1 31, coil 2 32, and coil 33 each include six sets of multiple first support portions 224a and multiple second support portions 224b alternately arranged in the winding direction of the display module 2. The blank spaces in coil 2 32 and coil 33 are schematic representations of the positions of the second support portions 224b, whose structures can be referenced from those in coil 1 31. The blank spaces in coil 33 along the opposite direction of the winding direction X are schematic representations of the positions of other coils when more coils are present, and do not represent the specific structure of the first support 224.

[0079] Because the outer wall of the reel comprises multiple planar areas arranged circumferentially along the reel, the winding cross-section of the display module is also polygonal when it is wound around the reel. Furthermore, the first support portion is located in a planar area, forming a flat structure with no stress accumulation, which helps reduce stress on the display module during winding. Additionally, the second support portion is located at the junction of two adjacent planar areas, i.e., at the bend, ensuring that the modulus of the second support portion is less than that of the first support portion. This allows the display module to maintain good bending performance at the bend and good support performance at the flat area.

[0080] like Figure 2 As shown, in this winding cross section, the connection between any two adjacent sides is a rounded corner.

[0081] By designing the modulus of each support component in the first support member, the connection between any two sides can be rounded. If the connection between two adjacent sides is a sharp angle, it is easy to cause defects such as mold marks, and may even damage the display module. By setting the connection between the two sides to rounded corners, it is beneficial to avoid mold marks and damage to the display module.

[0082] It should be noted that, Figure 2 and Figure 6 The illustration shows a hexagonal cross-section and three coils, but this is not a limitation. In other embodiments, the polygon can also be a quadrilateral, pentagon, octagon, or hexagon, and the number of coils can be 2 or 4, etc.

[0083] Figure 7 yes Figure 6 A partially enlarged structural diagram shows... Figure 6 The structure of the middle coil. Figure 8 yes Figure 7 A partially enlarged structural diagram. (See attached diagram.) Figure 7 and Figure 8 As shown, the first support portion 224a includes multiple first support bars 41 arranged parallel to each other along the winding direction X and multiple first connecting rib groups 51. Each first connecting rib group 51 is located between two adjacent first support bars 41. Each first connecting rib group 51 includes multiple first connecting ribs 511 arranged at intervals along the width direction Y of the display module 2. The two ends of each first connecting rib 511 are connected to the first support bars 41 on both sides. The width direction Y is perpendicular to the winding direction X. The second support portion 224b includes multiple second support bars 42 arranged parallel to each other along the winding direction X and multiple second connecting rib groups 52. Each second connecting rib group 52 is located between two adjacent second support bars 42. Each second connecting rib group 52 includes multiple second connecting ribs 521 arranged at intervals along the width direction Y of the display module 2. The two ends of each second connecting rib 521 are connected to the second support bars 42 on both sides.

[0084] The number of first connecting ribs 511 in the first connecting rib group 51 is greater than the number of second connecting ribs 521 in the second connecting rib group 52. Therefore, the modulus of the first support part 224a is greater than the modulus of the second support part 224b.

[0085] The modulus of the support part is controlled by controlling the number of connecting ribs. The more connecting ribs there are, the larger the modulus of the support part is, and the stronger the support capacity is, ensuring the support strength of the module in both the curled and unfolded states. The fewer connecting ribs there are, the smaller the modulus of the support part is, the easier the module is to bend, and the lower the overall coiling force of the module.

[0086] By designing the patterns of the first and second support portions to achieve different moduli, the implementation becomes simple. Through this alternating design, the first support portion provides excellent support performance, while the second support portion provides excellent flexible bending and winding capabilities.

[0087] like Figure 7 and Figure 8 As shown, optionally, the first support member 224 further includes a plurality of third support portions 224c, each third support portion 224c being connected between adjacent first support portions 224a and second support portions 224b. The two third support portions 224c on both sides of the first support portion 224a are arranged symmetrically with respect to the first support portion 224a.

[0088] When the display module 2 is in the winding state, a first support portion 224a and two third support portions 224c connected to the first support portion 224a are located together at one edge of the aforementioned winding cross section. Therefore, the sum of the widths of the first support portion 224a and the two third support portions 224c connected to the first support portion 224a in the aforementioned winding direction X is equal to the width of the planar area 11 of the roll 1, that is, equal to the side length of the aforementioned winding cross section.

[0089] Here, equality can mean complete equality, or the absolute value of the difference between the two is less than a difference threshold. This difference threshold can be 1%, 3%, or 5% of the width of the planar region, etc.

[0090] Optionally, the third support portion 224c includes multiple third support bars 43 arranged parallel to each other along the winding direction X and multiple third connecting rib groups 53. Each third connecting rib group 53 is located between two adjacent third support bars 43. The third connecting rib group 53 includes multiple third connecting ribs 531 arranged at intervals along the width direction Y of the display module 2. The two ends of each third connecting rib 531 are connected to the third support bars 43 on both sides.

[0091] For example, the number of third connecting ribs 531 in the third connecting rib group 53 is greater than the number of second connecting ribs 521 in the second connecting rib group 52 and less than the number of first connecting ribs 511 in the first connecting rib group 51. Therefore, the modulus of the third support portion 43 is less than the modulus of the first support portion 224a and greater than the modulus of the second support portion 224b.

[0092] By setting a third support between the first support and the second support, and the modulus of the third support being between the modulus of the first support and the modulus of the second support, the third support can play a buffering role, avoiding excessive compression of the second support in the bending state due to sudden changes in modulus, and making the deformation of the flexible display panel smoother.

[0093] In some examples, the modulus of the first support portion 224a is greater than 10 MPa. The modulus of the first support portion 224 is determined by the material and thickness of the first support portion, and its maximum value does not exceed the material modulus of a non-perforated structure. In practical applications, it can reach the GPa level. For example, the modulus of the first support portion 224a can be less than 100 MPa. The modulus of the second support portion 224b is less than 0.5 MPa. The modulus of the third support portion 224c is less than 10 MPa and greater than 0.5 MPa.

[0094] In one possible implementation, such as Figure 8 As shown, the third support portion 224c includes a first sub-support portion 2241 and a second sub-support portion 2242. The first support portion 224a is connected to one side of the first sub-support portion 2241, the other side of the first sub-support portion 2241 is connected to one side of the second sub-support portion 2242, and the other side of the second sub-support portion 2242 is connected to the second support portion 224b. The modulus of the first sub-support portion 2241 is less than the modulus of the first support portion 224a, and the modulus of the second sub-support portion 2242 is less than the modulus of the first sub-support portion 2241 but greater than the modulus of the second support portion 224b.

[0095] Optionally, in other embodiments, the third support portion 224c may further include more sub-support portions, provided that the modulus of the multiple sub-support portions in the same third support portion 224c decreases sequentially along the direction from the first support portion 224a to the second support portion 224b, and the modulus of each sub-support portion is less than the modulus of the first support portion 224a and greater than the modulus of the second support portion 224b.

[0096] For example, in Figure 8 In the middle, the first support part 224a includes two first support bars 41, and the first connecting bar group 51 includes 12 first connecting bars 511.

[0097] In other embodiments, the number of first support bars 41 included in a single first support portion 224a may also be greater than two. In this case, in the first support portion 224a, the number of first connecting ribs 511 in two adjacent first connecting rib groups 51 may be the same or different.

[0098] When the number of first support bars 41 included in a single first support portion 224a can be greater than 3, the number of first connecting rib groups 51 is greater than 2. In this case, in the first support portion 224a, the number of first connecting ribs 511 in two adjacent first connecting rib groups 51 is different, and the number of first connecting ribs 511 in multiple first connecting rib groups 51 alternates. For example, when the first support portion 224a includes 4 first support bars 41 and 3 first connecting rib groups 51, the first first connecting rib group 51 includes 12 first connecting ribs 511, the second first connecting rib group 51 includes 11 first connecting ribs 511, and the third first connecting rib group 51 includes 12 first connecting ribs 511. Here, the number of first support bars and first connecting rib groups in the first support portion 224a is only an example, and the embodiments disclosed herein are not limited thereto.

[0099] For example, in the second support portion 224b, the number of second connecting ribs 521 in two adjacent second connecting rib groups 52 is different, and the number of second connecting ribs 521 in multiple second connecting rib groups 52 alternates. For example, Figure 7 Taking the first second support section 224b from bottom to top as an example, it includes four second support bars 42 and three groups of second connecting ribs 52. The first group of second connecting ribs 52 includes five second connecting ribs 521, the second group of second connecting ribs 52 includes four second connecting ribs 521, and the third group of second connecting ribs 52 includes five second connecting ribs 521. That is, the number of second connecting ribs 521 is the same in odd-numbered groups of second connecting ribs 522, and the number of second connecting ribs 521 is the same in even-numbered groups of second connecting ribs 522.

[0100] Optionally, the second connecting ribs 521 in the same number of second connecting rib groups 52 are arranged in a one-to-one correspondence, and the corresponding second connecting ribs 521 are located on the same straight line extending along the winding direction X.

[0101] In this embodiment of the present disclosure, the second support portion 224b is an axisymmetric pattern symmetrical about a first axis of symmetry A and an axisymmetric pattern symmetrical about a second axis of symmetry B, wherein the extension direction of the first axis of symmetry A is the aforementioned width direction Y, and the extension direction of the second axis of symmetry B is the aforementioned winding direction X.

[0102] Optionally, in the width direction Y, each of the fewer second connecting bars 521 in the second connecting bar group 52 is located between two adjacent second connecting bars 521 in the more numerous second connecting bar group 52.

[0103] In the second support 224b, the distance between any two adjacent second connecting ribs 521 in the width direction Y is equal.

[0104] In other embodiments, in the second support portion 224b, each second connecting rib group 52 may contain the same number of second connecting ribs 521.

[0105] exist Figure 8 In the illustrated embodiment, in order to achieve that the modulus of the first sub-support portion 2241 and the second sub-support portion 2242 decreases along the direction from the first support portion 224a to the second support portion 224b in the connected first sub-support portion 2241 and the second sub-support portion 2242, the number of third connecting ribs 531 in the third connecting rib group 53 in the third support portion 224c decreases along the direction from the first support portion 224a to the second support portion 224b.

[0106] In some examples, the number of third connecting ribs 531 can vary as follows: from the first support 224a to the second support 224b, the number of third connecting ribs 531 in the nth group of third connecting ribs 53 is greater than the number of third connecting ribs 531 in the (n+1)th group of third connecting ribs 53. Here, n is a positive integer.

[0107] For example, such as Figure 8 As shown, the third support portion 224c includes four third support bars 43 and three third connecting rib groups 53. From the first support portion 224a to the second support portion 224b, the first third connecting rib group 53 contains four third connecting ribs 531, the second third connecting rib group 53 contains three third connecting ribs 531, and the third third connecting rib group 53 contains two third connecting ribs 531.

[0108] Figure 9 yes Figure 8 A schematic diagram of the torsion strip gradient structure. (See diagram below.) Figure 8 and Figure 9 As shown, the first torsion bar 61 is a segment of a first support bar 41, the second torsion bar 62 is a segment of a third support bar 43 that is closest to the first support portion 224a, the third torsion bar 63 is a segment of a third support bar 43 that is separated from the first support portion 224a by one third support bar 43, and the fourth torsion bar 64 is a segment of a second support bar 42 that is closest to the third support bar 43 in the second support portion 224b.

[0109] One end of the first torsion bar 61 is connected to one end of the second torsion bar 62 via a third connecting rib 531, the other end of the second torsion bar 62 is connected to one end of the third torsion bar 63 via a third connecting rib 531, and the other end of the third torsion bar 63 is connected to the fourth torsion bar 64 via a third connecting rib 531.

[0110] In this embodiment of the disclosure, the modulus matching between the first support portion 224a, the first sub-support portion 2241, and the second sub-support portion 2242 can be performed according to the following formula (1).

[0111] L1 + L2 + W*1 = L3 (1)

[0112] In formula (1), L1 is the length of the first torsion bar, L2 is the length of the second torsion bar, L3 is the length of the third torsion bar, and W represents the width of the connecting bar.

[0113] For example, the length of the first torsion bar 61 is 9.25 mm, the width of the connecting rib connected to the first torsion bar 61 is 1 mm, the bar width of the first torsion bar 61 is 0.9 mm, the width of the adjacent hole of the first torsion bar 61 (i.e., the distance between the first torsion bar 61 and the second torsion bar 62 in the winding direction X, or the length of the connecting rib connected to the first torsion bar 61) is 0.9 mm, and the evaluation modulus is 11.2 MPa; the length of the second torsion bar 62 is 15.25 mm, the width of the connecting rib connected to the second torsion bar 62 is 1 mm, the bar width of the second torsion bar 62 is 0.9 mm, the width of the adjacent hole of the second torsion bar 62 (i.e., the distance between the second torsion bar 62 and the third torsion bar 63 in the winding direction X, or the length of the connecting rib connected to the second torsion bar 62) is 0.9 mm, and the evaluation modulus is 2.4 MPa. a; The length of the third torsion bar 63 is 25.5 mm, the width of the connecting rib connected to the third torsion bar 63 is 1 mm, the width of the third torsion bar 63 is 0.9 mm, the width of the adjacent hole of the third torsion bar 63 (i.e., the distance between the third torsion bar 63 and the fourth torsion bar 64 in the winding direction X, or the length of the connecting rib connected to the third torsion bar 63) is 0.9 mm, and the evaluation modulus is 0.6 MPa; The length of the fourth torsion bar 64 is 25.5 mm, the width of the connecting rib connected to the fourth torsion bar 64 is 1 mm, the width of the fourth torsion bar 64 is 0.84 mm, the width of the adjacent hole of the fourth torsion bar 64 (i.e., the distance between the fourth torsion bar 64 and the adjacent second support bar in the winding direction X, or the length of the connecting rib connected to the fourth torsion bar 64) is 0.84 mm, and the evaluation modulus is 0.5 MPa.

[0114] Here, the width of the connecting rib refers to its dimension in the width direction Y, and the length of the connecting rib refers to its dimension in the winding direction X. The length of the torsion bar refers to its dimension in the width direction Y, and the width of the torsion bar refers to its dimension in the winding direction X.

[0115] In this embodiment of the disclosure, the modulus is changed by adjusting the length of the torsion bar, where the length of the torsion bar refers to its dimension in the winding direction X. All other things being equal, the longer the torsion bar, the smaller the modulus.

[0116] In other embodiments, the modulus of the support can be changed by adjusting at least one of the following: the length of the torsion bar, the width of the connecting rib, the width of the torsion bar, the number of connecting ribs, and the length of the connecting ribs connected to the torsion bar.

[0117] In this embodiment, the widths of the first connecting rib, the second connecting rib, and the third connecting rib are all equal, in order to simplify the modular design process of the support portion.

[0118] In other embodiments, the widths of the first, second, and third connecting ribs may be unequal or partially equal. In some examples, the width of the first connecting rib is greater than the width of the third connecting rib, and the width of the third connecting rib is greater than the width of the second connecting rib. For example, the width of the first connecting rib is 1 mm, the width of the second connecting rib is 0.8 mm, and the width of the third connecting rib is 0.9 mm, etc.

[0119] In some examples, the width of the first connecting rib is greater than the width of the third connecting rib, and the width of the third connecting rib is equal to the width of the second connecting rib. For example, the width of the first connecting rib is 1mm, and the width of the second and third connecting ribs is 0.9mm, etc.

[0120] In this embodiment, the widths of the first torsion bar, the second torsion bar, and the third torsion bar are all equal to simplify the modulus design process of the support portion.

[0121] In other embodiments, the widths of the first, second, and third torsion bars may be unequal or partially equal. In some examples, the width of the first torsion bar is greater than the width of the second torsion bar, and the width of the second torsion bar is greater than the width of the third torsion bar. For example, the width of the first torsion bar is 1 mm, the width of the second torsion bar is 0.95 mm, and the width of the third torsion bar is 0.9 mm.

[0122] In some examples, the width of the first twist bar is greater than the width of the second twist bar, and the width of the second twist bar is equal to the width of the third twist bar. For example, the width of the first twist bar is 1mm, the width of the second and third twist bars is 0.9mm, and the width of the fourth twist bar is 0.9mm.

[0123] All other things being equal, the greater the width of the torsion bar, the greater its modulus.

[0124] The width of the holes adjacent to the torsion bar refers to the distance between the torsion bar and the adjacent support bar in the winding direction X, or the length of the connecting ribs connected to the torsion bar.

[0125] In this embodiment, the connecting ribs connecting the first torsion bar, the second torsion bar, and the third torsion bar are all of equal length, in order to simplify the modulus design process of the support.

[0126] In other embodiments, the lengths of the connecting ribs connecting the first, second, and third torsion bars may be unequal or partially equal. In some examples, the length of the connecting rib connected by the first torsion bar is less than the length of the connecting rib connected by the second torsion bar, and the length of the connecting rib connected by the second torsion bar is less than the length of the connecting rib connected by the third torsion bar. For example, the length of the connecting ribs connected by the first torsion bar is 0.9 mm, the length of the connecting ribs connected by the second torsion bar is 0.95 mm, and the length of the connecting ribs connected by the third torsion bar is 1 mm, etc.

[0127] In some examples, the length of the connecting rib in the first torsion bar connection is greater than the length of the connecting rib in the second torsion bar connection, and the length of the connecting rib in the second torsion bar connection is equal to the length of the connecting rib in the third torsion bar connection. For example, the length of the connecting rib in the first torsion bar connection is 0.9 mm, and the lengths of the connecting ribs in the second and third torsion bar connections are both 1 mm, etc.

[0128] All other things being equal, the longer the connecting rib connected to the torsion bar, the smaller the modulus.

[0129] In other embodiments, the number of third connecting ribs can vary as follows: from the first support 224a to the second support 224b, every x groups of third connecting ribs form a set, where x is greater than 1 and is an integer; the number of third connecting ribs in the nth set is greater than the number of third connecting ribs in the (n+1)th set. Here, n is a positive integer.

[0130] In this embodiment, the illustration is given by taking the example that each connecting bar in each connecting bar group is connected to two adjacent support bars. In practical applications, some connecting bars in a connecting bar group may only be connected to one adjacent support bar. It is sufficient that at least one connecting bar in each connecting bar group is connected to two adjacent support bars.

[0131] Figure 10 This is a schematic diagram of the rolled-up state of another rollable display device provided in this embodiment of the present disclosure. Figure 10 As shown, the included angle between the extensions of any two adjacent first support portions 224a is equal. That is, in the winding cross section, the included angle between any two adjacent sides is equal. When two sides are connected by a fillet, the included angle between the two sides refers to the included angle between the extensions of the two sides.

[0132] In this embodiment, the winding portion of the first support member 22 is divided into multiple sections. Each section includes a first support portion 224a, third support portions 224c on both sides of the first support portion 224a, and half of the width of the second support portions 224b on both sides of the first support portion 224a. In this case, the width of each section can be equal to the sum of the width of the first support portion 224a, the width of the two third support portions 224c connected to the first support portion 224a, and half the width of the two second support portions 224b located on both sides of the first support portion 224a.

[0133] Figure 11 yes Figure 10 A cross-sectional diagram of one of the roll segments. (See diagram below.) Figure 11 As shown, the cross-section of this section is approximately trapezoidal. The longer side of the trapezoid is farther from the scroll axis, while the shorter side is closer to the scroll axis.

[0134] For example, when the module is in the wound state, each section satisfies the following formulas (2)-(7):

[0135]

[0136] a1=2R*tan(θ / 2) (3)

[0137] a m+1 =a1+md (4)

[0138] t=md / 2tan(θ / 2) (5)

[0139] L=na1+n(n-1)d / 2 (6)

[0140]

[0141] Where R is the winding radius, m is the number of sides of the polygon in the winding cross-section, θ is the interior angle of the polygon, t is the sum of the thickness of the display module and the distance between two adjacent coils, a1 is the bottom width of the first section, and a m+1 d is the bottom width of the (m+1)th section, d is the difference of the arithmetic sequence, n is the total number of sections, L is the total length of the display module, and D is the winding diameter.

[0142] When m is a multiple of 4, the winding cross section is a centrally symmetrical figure, and the parameters calculated by the above formulas (2)-(7) are more accurate.

[0143] It should be noted that, Figure 10 and Figure 11 The diagram illustrates a hexagonal cross-section, but is not limited to this. In other embodiments, the polygon can also be a quadrilateral, an octagon, or a dodecagon, etc.

[0144] In a first embodiment, the bending radius at the junction of two adjacent sides in the first coil is smaller than the bending radius at the junction of two adjacent sides in the second coil. The first coil and the second coil are any two adjacent coils from a plurality of coils, and the first coil is closer to the reel than the second coil.

[0145] For example, such as Figure 10 As shown, the bending radius at the connection of two adjacent sides in coil 1 31 is smaller than the bending radius at the connection of two adjacent sides in coil 2 32, and the bending radius at the connection of two adjacent sides in coil 2 32 is smaller than the bending radius at the connection of two adjacent sides in coil 33.

[0146] The radius of curvature at the junction of two adjacent sides in each coil satisfies formula (8):

[0147] R k-1 =R min +(k-1)t (8)

[0148] In formula (8), k-1 represents the k-th coil in the radially outward direction of the spool, R k-1 Let R represent the bending radius of the k-th coil, where k is a positive integer greater than 1. min R represents the radius of curvature at the junction of two adjacent sides in the first coil. min It must be at least greater than the bending radius that the display module can withstand. t represents the sum of the thickness of the display module and the spacing between adjacent coils. The value of t can range from 0 to 1 mm.

[0149] For example, R1 is 7.33mm, R2 is 8.63mm, and R3 is 9.93mm.

[0150] Optionally, along the direction away from the spool, the side lengths of the winding sections of the multiple coils corresponding to the same planar area remain fixed, that is, the side lengths of the winding sections of the multiple coils corresponding to the same planar area are equal. For example, when the first support member 224 includes a first support portion 224a, a second support portion 224b, and a third support portion 224c, the side length of the winding section is equal to the sum of the width of the first support portion 224a in the corresponding coil and the widths of the two third support portions 224c connected to the first support portion 224a. When the first support member 224 includes a first support portion 224a and a second support portion 224b, the side length of the winding section is equal to the width of the first support portion 224a in the corresponding coil.

[0151] Optionally, within the same coil, the side length of the winding cross-section increases in the direction away from the spool in the aforementioned winding direction X. For example, it can increase at an arithmetic progression or at a non-arithmic progression.

[0152] In the second embodiment, the bending radius at the junction of two adjacent sides in the first coil is equal to the bending radius at the junction of two adjacent sides in the second coil. The first coil and the second coil are any two adjacent coils from a plurality of coils, and the first coil is closer to the reel than the second coil.

[0153] In this second embodiment, the side length of the winding cross-section increases in the direction away from the spool in the aforementioned winding direction X. For example, Figure 3 In the diagram, the lengths of the six sides in coil 1 31 increase sequentially, the lengths of the six sides in coil 2 32 increase sequentially, and the lengths of the six sides in coil 33 increase sequentially. Furthermore, the length of the first side in coil 2 32 (i.e., the length of the side in coil 2 32 that is connected to the last side of coil 1 31) is greater than the length of the last side in coil 1 31; the length of the first side in coil 33 (i.e., the length of the side in coil 33 that is connected to the last side of coil 2 32) is greater than the length of the last side in coil 2 32.

[0154] For example, the first support member 224 is made of metal materials such as stainless steel, copper, aluminum or titanium alloy.

[0155] For example, the thickness of the first support member 224 ranges from 300 μm to 500 μm. When the thickness of the first support member is within this range, it can provide good support capability.

[0156] Figure 12 This is an exploded view of a support structure provided in an embodiment of this disclosure. For example... Figure 5 and Figure 12 As shown, the support structure 22 also includes a second support member 222. The second support member 222 is located between the first support member 224 and the back of the flexible display panel 21.

[0157] For example, the second support member 222 is a metal layer with a hollow pattern or a metal layer without a hollow pattern, and its material is a metal material such as stainless steel, copper, aluminum or titanium alloy.

[0158] In some examples, the second support 222 is a metal layer without a perforated pattern. In this case, the thickness of the second support 222 can range from 20 μm to 30 μm.

[0159] In other examples, the second support 222 is a metal layer with a perforated pattern. In this case, the thickness of the second support 222 can range from 100 μm to 150 μm.

[0160] Optionally, such as Figure 5 and Figure 11 As shown, the support structure 22 also includes a protective layer 225. The protective layer 225 is located on the side of the first support member 224 away from the flexible display panel 21.

[0161] For example, the protective layer 225 includes at least one of a foam layer and a thermoplastic polyurethane layer. That is, the protective layer may be a foam layer or a thermoplastic polyurethane layer, or the protective layer may be a laminated structure of a foam layer and a thermoplastic polyurethane layer.

[0162] When the protective layer is made of the above materials, the surface friction coefficient is low and the scratch resistance is strong. It can reduce the friction of the protective cover in the flexible display panel during the layer-by-layer rolling process, prevent damage to the protective cover, and thus prevent the flexible display panel from displaying poorly.

[0163] Optionally, such as Figure 5 and Figure 11 As shown, the support structure 22 also includes a first adhesive layer 221 and a second adhesive layer 223. The first adhesive layer 221 is used to bond the second support member 222 and the flexible display panel 21; the second adhesive layer 223 is used to bond the first support member 224 and the second support member 222.

[0164] For example, the first adhesive layer 221 is an optical adhesive material that includes or does not contain a substrate.

[0165] For example, the second adhesive layer 223 is an optical adhesive containing a substrate.

[0166] Optionally, the portion of the second adhesive layer 223 that is outside the support structure relative to the orthographic projection of the flexible display panel 21 onto the first support is only the portion close to the second support 222.

[0167] The second adhesive layer 223 is only applied to the portion of the flexible display panel that is outside the support structure 2, with its projection onto the first support member 22. This prevents the flexible circuit board from being bonded and thus avoids pulling on the flexible circuit board.

[0168] See you again Figure 5 The first support member 224 further includes a connecting portion 224d. The connecting portion 224d is located on one side of all the support portions (including the aforementioned first support portion 224a, second support portion 224b, and third support portion 224c) in the winding direction X, and is fixedly connected to the roll 1. The orthographic projection of the first side edge 211 of the flexible display panel 21 onto the first support member 224 is located within the connecting portion 224d. In this embodiment, all the support portions form a winding portion 224e, which is not fixedly connected to the roll 1 and can be wound or unwound.

[0169] In another embodiment, the orthographic projection of the first side 211 of the flexible display panel 21 onto the first support member 224 is located outside the connecting portion 224d. For example, when the display area of ​​the flexible display panel is fixed, this method can maximize the utilization rate of the display area of ​​the flexible display panel by placing the connecting portion 224d on the outside.

[0170] Optionally, the connecting portion 224d includes multiple connecting strips 44, which are arranged parallel to each other at intervals along the winding direction X. No connecting ribs are provided between adjacent connecting strips 44. This ensures that the modulus of the connecting portion 224d is small, thus fully guaranteeing the bendability of the support member.

[0171] In this embodiment of the disclosure, the modulus of the connecting portion 224d is less than the modulus of the portion of the first support member 22 excluding the connecting portion 224d (which may be the average modulus or the minimum modulus).

[0172] See you again Figure 2 The scroll 1 includes a shaft 1a and a housing 1b. The housing 1b is connected to the shaft 1a, and a first accommodating space 1c is defined between the housing 1b and the shaft 1a. There is a gap between one side of the housing 1b and the shaft 1a. One end of the display module 2 is located in the first accommodating space 1c, and a portion of the display module 2 is located in the gap. The portion of the display module 2 located in the gap is sandwiched between the housing 1b and the shaft 1a. That is, one side of the housing 1b presses the display module 2 located in the gap against the surface of the shaft 1. This helps to prevent the display module from peeling at the gap.

[0173] In practice, the housing 1b can be a plate-shaped structural member with an arc-shaped inner surface (i.e., the surface facing the shaft 1a) and an outer surface defining the aforementioned at least part of the planar region 11.

[0174] like Figure 1 As shown, the display module 2 also includes a flexible circuit board 23 and a printed circuit board 24. The printed circuit board 24 is located in the first accommodating space 1c and connected to the shaft 1a. The flexible circuit board 23 is connected between the flexible display panel 21 and the printed circuit board 24 and is located in the first accommodating space 1c.

[0175] When the display module unfolds, the connection between the display module and the shaft bears the load, while the flexible circuit board is not stressed, which helps prevent damage to the flexible circuit board. Furthermore, the flexible circuit board's free-form shape reduces stress caused by the display module's misalignment, further preventing damage.

[0176] Figure 13 This is a schematic diagram of a planar structure of a support structure provided in an embodiment of this disclosure. For example... Figure 12 and Figure 13 As shown, the support structure 22 has multiple clearance openings 22a, which are located at one end of the support structure 22 near the spool 1.

[0177] Optionally, the rollable display device also includes a fastener (not shown) that passes through the housing 1b to connect the housing 1b to the shaft 1a. In practice, a mounting hole for the fastener to pass through can be provided in the housing 1b. The center of the fastener is located in the clearance opening 22a.

[0178] For example, the fastener can be a bolt or screw, etc.

[0179] The shape of the clearance opening can be customized according to actual needs, such as square, rectangle, or arc. In implementation, the area of ​​the clearance opening should be as small as possible, matching the contour shape of the center of the fastener to surround it, thereby maximizing the bonding area between the support structure and the shaft and ensuring the stability of the support structure.

[0180] Figure 13 This is only a schematic diagram of a clearance opening for one type of support structure. The structure and number of clearance openings can be adjusted according to actual needs.

[0181] Optionally, the flexible display panel includes a display substrate and a protective cover plate, with the protective cover plate located on the display surface of the display substrate.

[0182] For example, the display substrate can be an organic light-emitting diode (OLED) display substrate or a quantum dot light-emitting diode (QLED) display substrate, etc.

[0183] For example, when the display substrate is an OLED display substrate, the material used to manufacture the display substrate is an organic light-emitting material; when the display substrate is a QLED display substrate, the material used to manufacture the display substrate is a quantum dot light-emitting material.

[0184] For example, the protective cover can be made of a transparent material, such as glass or plastic.

[0185] Optionally, the display substrate includes a substrate, a display functional layer, and a touch functional layer, which are sequentially stacked on the surface of the substrate.

[0186] The first support has a large elastic modulus, thus it has a strong rebound force, which can improve the support strength of the touch function layer.

[0187] For example, the substrate can be any transparent substrate, such as a glass substrate, quartz substrate, plastic substrate, other transparent rigid substrate, or other transparent flexible substrate, and can be a single-layer or multi-layer structure. Taking a multi-layer structure as an example, the substrate includes a first PI (polyimide) layer, a first sub-protective layer, a second PI layer, and a second sub-protective layer stacked sequentially from bottom to top. The two sub-protective layers are used to protect the first PI layer and the second PI layer, preventing damage to the PI layer by subsequent processes. The second sub-protective layer is also covered with a buffer layer, which can block water and oxygen and block alkaline ions.

[0188] For example, the display functional layer may include various functional structures for displaying images, such as OLED structures, QLED structures, or other electroluminescent structures.

[0189] For example, the touch functional layer may include various sensing structures for implementing touch sensing, such as self-capacitive sensing structures or mutual-capacitive sensing structures. In some examples, in the mutual-capacitive sensing structure, the sensing electrodes adopt a transparent conductive sensing structure such as a metal mesh structure. For example, the touch functional layer includes a first sensing electrode layer, an insulating layer, and a second sensing electrode layer stacked sequentially from bottom to top.

[0190] Figure 14 This is a schematic diagram of another first support member provided in an embodiment of this disclosure. The difference from the previous embodiment lies in the structure of the winding portion 224e. For example... Figure 14 As shown, the winding section 224e includes multiple fourth support bars 45 arranged parallel to each other and not connected along the winding direction X. There are no connecting ribs between the fourth support bars 45.

[0191] To meet this structural requirement, a full strip structure is adopted to fully ensure the bendability of the first support member.

[0192] Figure 15 This is a schematic diagram of another first support member provided in an embodiment of this disclosure. Figure 15 As shown, with Figure 14 The difference in the first support member shown is that the winding part 224e also includes a plurality of fourth connecting rib groups 55, and a plurality of support bars 45 are arranged in parallel at intervals along the winding direction X. Each fourth connecting rib group 55 includes at least one fourth connecting rib 551, and the fourth connecting rib 551 in each fourth connecting rib group 55 is connected to two adjacent fourth support bars 55.

[0193] like Figure 15 As shown, the fourth connecting ribs 551 in all the fourth connecting rib groups 55 are arranged in three rows along the width direction of the first support member 224. The three-row connecting rib structure can enhance the integrity of the first support member 224 and has some supporting performance, but the overall modulus is very small, about 0, which can still ensure the bending of the winding part.

[0194] For example, the number of fourth connecting ribs 551 in two adjacent fourth connecting rib groups 55 is different, and the number of fourth connecting ribs 551 in multiple fourth connecting rib groups 55 alternates. For example, Figure 15 Taking the two fourth connecting rib groups 55 closest to the connecting part 224d as examples, the first fourth connecting rib group 55 includes two fourth connecting ribs 551, and the second fourth connecting rib group 55 includes one fourth connecting rib 551. The fourth connecting rib 551 is staggered with the fourth connecting ribs 551 of the two adjacent fourth connecting rib groups 55. That is, the number of fourth connecting ribs 551 is the same in the odd-numbered fourth connecting rib groups 55, and the number of fourth connecting ribs 551 is the same in the even-numbered fourth connecting rib groups 55. The positions of the fourth connecting ribs 551 of the two adjacent fourth connecting rib groups 55 are staggered. Here, staggered positions mean that they are not on the same straight line extending along the winding direction X, and the fourth connecting ribs 551 of the first and second fourth connecting rib groups 55 are alternately arranged along the width direction Y.

[0195] Figure 16 This is a schematic diagram of another first support member provided in an embodiment of this disclosure. Figure 15 The difference in the first support member shown is that the fourth connecting ribs 551 in all the fourth connecting rib groups 55 are arranged in 8 rows along the width direction of the first support member 224. Increasing the number of rows of fourth connecting ribs 551 can further improve the support performance of the first support member 224, with a modulus of approximately 0.7 MPa.

[0196] For example, the number of fourth connecting bars 551 in two adjacent fourth connecting bar groups 55 is the same, and the positions of the fourth connecting bars 551 in multiple fourth connecting bar groups 55 are staggered. For example, Figure 16 Taking the two fourth connecting rib groups 55 closest to the connecting portion 224d as examples, the first fourth connecting rib group 55 includes four fourth connecting ribs 551 arranged sequentially along the width direction Y, and the second fourth connecting rib group 55 includes four fourth connecting ribs 551 arranged sequentially along the width direction Y. The four fourth connecting ribs 551 in the first fourth connecting rib group 55 and the four fourth connecting ribs 551 in the second fourth connecting rib group 55 are arranged alternately along the width direction Y. That is, the number of fourth connecting ribs 551 in each fourth connecting rib group 55 is the same, and the positions of the fourth connecting ribs 551 in adjacent fourth connecting rib groups 55 are staggered.

[0197] exist Figure 15 and Figure 16 In the embodiment shown, the number of rows of connecting ribs is fixed, and the modulus of the winding part is also fixed in the winding direction X; the more rows of connecting ribs there are, the more the modulus and winding force of the winding part will increase.

[0198] The adapted winding radius of the above embodiments is R4 to R15, but the embodiments of this application are not limited to this winding radius and can be adjusted according to actual needs.

[0199] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A rollable display device, comprising: include: A reel, the reel having a polygonal cross-section, and the outer peripheral wall of the reel including a plurality of planar areas arranged circumferentially along the reel; A display module, one end of which is connected to the scroll and the display module is capable of being rolled up and unrolled around the scroll. The display module includes a flexible display panel and a support structure. The support structure is located on the back of the flexible display panel and connected to the flexible display panel. The support structure includes a first support member, which includes a plurality of first support portions and a plurality of second support portions. The plurality of first support portions and the plurality of second support portions are alternately arranged in the winding direction of the display module, and the modulus of the first support portion is greater than the modulus of the second support portion. When the display module is wound around the spool, the display module forms multiple loops around the spool. The winding cross section of each loop is polygonal and the winding cross section is perpendicular to the length direction of the spool. The first support part is located in the planar area of ​​the spool, and the second support part is located at the connection between two adjacent planar areas.

2. The rollable display device according to claim 1, characterized in that, The first support portion includes multiple first support bars and multiple first connecting rib groups arranged parallel to each other along the winding direction. Each first connecting rib group is located between two adjacent first support bars. Each first connecting rib group includes multiple first connecting ribs arranged at intervals along the width direction. At least one first connecting rib has its two ends connected to the first support bars on both sides. The width direction is perpendicular to the winding direction. The second support portion includes multiple second support bars and multiple second connecting rib groups arranged parallel to each other along the winding direction. Each second connecting rib group is located between two adjacent second support bars. The second connecting rib group includes multiple second connecting ribs arranged at intervals along the width direction. At least one second connecting rib is connected to the second support bars on both sides at both ends. The number of second connecting bars in the second connecting bar group is less than the number of first connecting bars in the first connecting bar group.

3. The rollable display device according to claim 2, characterized in that, The first support member further includes a plurality of third support portions, which are connected between adjacent first support portions and second support portions. The modulus of the third support portion is less than that of the first support portion and greater than that of the second support portion.

4. The rollable display device according to claim 3, characterized in that, The third support portion includes multiple third support bars and multiple third connecting rib groups arranged parallel to each other along the winding direction. Each third connecting rib group is located between two adjacent third support bars. Each third connecting rib group includes multiple third connecting ribs arranged at intervals along the width direction. At least one third connecting rib has its two ends connected to the third support bars on both sides. The number of connecting bars in the third connecting bar group is greater than the number of second connecting bars in the second connecting bar group and less than the number of first connecting bars in the first connecting bar group.

5. The rollable display device according to any one of claims 1 to 4, characterized in that, In the winding cross section, the included angle between any two adjacent sides is equal.

6. The rollable display device according to claim 5, characterized in that, In the winding cross section, the connection between any two adjacent sides is rounded.

7. The rollable display device according to claim 6, characterized in that, The bending radius at the junction of two adjacent sides in the first coil is less than or equal to the bending radius at the junction of two adjacent sides in the second coil. Any two adjacent coils among the plurality of coils, including the first coil and the second coil, are located closer to the spool than the second coil.

8. The rollable display device according to claim 7, characterized in that, Along a direction away from the spool, the side lengths of corresponding planar regions in the winding cross sections of the plurality of coils are equal or increasing.

9. The rollable display device according to claim 7, characterized in that, The bending radius at the junction of two adjacent sides in each coil satisfies the following formula: R k-1 = R min +(k-1)t; wherein k-1 denotes the kth winding in a radially outward direction from the reel, R k-1 denotes the bending radius of the kth winding, k is a positive integer greater than 1, R min denotes the bending radius of the connection between two adjacent edges in the first winding, and t denotes the sum of the module thickness and the spacing between adjacent windings.

10. The rollable display device according to any one of claims 1 to 4 and claims 6 to 9, characterized in that, The first support member further includes a connecting portion, which is located on one side of the plurality of first support portions and the plurality of second support portions in the winding direction, and the connecting portion is fixedly connected to the reel; When the display module is unfolded, the orthographic projection of the first side of the flexible display panel onto the first support member is located outside the connecting portion, or the orthographic projection of the first side of the flexible display panel onto the first support member is located inside the connecting portion. The first side of the flexible display panel is the side of the flexible display panel that is close to the roll.

11. The rollable display device according to claim 10, characterized in that, The connecting part includes multiple connecting strips that are arranged parallel to each other and are not connected along the winding direction.

12. The rollable display device according to any one of claims 1 to 4, 6 to 9, and 11, characterized in that, The support structure further includes a second support member, which is located between the first support member and the back of the flexible display panel.

13. The rollable display device according to claim 12, characterized in that, The second support member is either a perforated metal layer or a non-perforated metal layer.

14. The rollable display device according to any one of claims 1 to 4, 6 to 9, 11, and 13, characterized in that, The support structure also includes a protective layer located on the side of the first support member away from the flexible display panel.

15. The rollable display device according to claim 14, characterized in that, The protective layer includes at least one of a foam layer and a thermoplastic polyurethane layer.

16. The rollable display device according to any one of claims 1 to 4, 6 to 9, 11, 13, and 15, characterized in that, The scroll includes a shaft and a housing, the housing being connected to the shaft and defining a first accommodating space between the housing and the shaft, a gap between one side of the housing and the shaft, one end of the display module being located in the first accommodating space, a portion of the display module being located in the gap, and the portion of the display module located in the gap being sandwiched between the housing and the shaft.

17. The rollable display device according to claim 16, characterized in that, The rollable display device further includes a flexible circuit board and a printed circuit board, the printed circuit board being located in the first accommodating space and connected to the shaft; the flexible circuit board is connected between the flexible display panel and the printed circuit board, and is located in the first accommodating space.

18. The rollable display device according to claim 17, characterized in that, The support structure has a clearance opening at one end near the reel. The rollable display device further includes a fixing member that passes through the housing and is connected to the shaft, with the middle part of the fixing member located in the clearance opening.

19. The rollable display device according to any one of claims 1 to 4, 6 to 9, 11, 13, 15, and 17 to 18, characterized in that, The flexible display panel includes a substrate, a display functional layer, and a touch functional layer, wherein the display functional layer and the touch functional layer are sequentially stacked on the surface of the substrate.

20. A rollable display device, characterized in that, It includes a scroll and a display module, one end of which is connected to the scroll and the display module is capable of being rolled up and unrolled around the scroll. The display module includes a flexible display panel and a support structure, wherein the support structure is located on the back side of the flexible display panel and is connected to the back side of the flexible display panel; The outer contour of the cross-section of the spool is polygonal. When the display module is wound around the spool, the winding section of the display module is a polygon that matches the outer contour of the cross-section. Both the cross-section and the winding section are perpendicular to the length direction of the spool. The support structure includes a first support member, which includes a connecting part and a winding part connected together. The connecting part is connected to the spool, and the winding part can be wound or unwound around the spool. The modulus of the winding part is greater than that of the connecting part.

21. The rollable display device according to claim 20, characterized in that, The connecting part includes multiple connecting strips that are arranged parallel to each other and are not connected along the winding direction of the display module.

22. The rollable display device according to claim 20, characterized in that, The winding section includes multiple fourth support bars arranged parallel to each other at intervals along the winding direction of the display module.

23. The rollable display device according to claim 22, characterized in that, The winding section also includes multiple fourth connecting rib groups. The multiple fourth support bars are arranged parallel to each other at intervals along the winding direction of the display module. Each fourth connecting rib group includes at least one fourth connecting rib, and at least one fourth connecting rib in the fourth connecting rib group is connected to two adjacent fourth support bars.

24. The rollable display device according to claim 20, characterized in that, The modulus of the winding portion in the winding direction of the display module remains constant.

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