Supporting assembly, rollable display module and display device

Abstract

The utility model provides a supporting assembly, a rollable display module and a display device, and relates to the technical field of display. The supporting assembly is used for being connected to the backlight side of the display assembly to support the display assembly, the supporting assembly comprises an integrally-formed supporting plate, and the supporting plate comprises a first supporting layer close to the display assembly and a second supporting layer away from the display assembly; the first supporting layer comprises a plurality of first supporting ribs arranged at intervals in the first direction, the second supporting layer comprises a plurality of second supporting ribs arranged at intervals in the first direction, the first supporting ribs and the second supporting ribs extend in the second direction, and the second direction intersects with the first direction; wherein the distance between every two adjacent first supporting ribs is a first distance, the distance between every two adjacent second supporting ribs is a second distance, and the ratio of the second distance to the first distance is larger than 1 and smaller than or equal to 20. The ratio of the thickness of the second supporting layer to the thickness of the first supporting layer is larger than or equal to 1 and smaller than or equal to 10.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a support assembly, a rollable display module and a display device. BACKGROUND

[0002] The display module of the rollable display device includes a display assembly and a support assembly for supporting the display assembly. The rollable display module in the related art cannot balance the rollability of the support assembly and the flatness of the display assembly. SUMMARY

[0003] Embodiments of the present disclosure provide a support assembly, a rollable display module and a display device, which balance the flatness of the display assembly while improving the rollability of the support assembly.

[0004] Embodiments of the present disclosure adopt the following technical solutions:

[0005] In one aspect, a support assembly is provided for connecting to a backlight side of a display assembly to support the display assembly, and the support assembly is capable of being stretched out or rolled back along a first direction together with the display assembly, characterized in that the support assembly comprises a support plate formed integrally, the support plate comprising a first support layer close to the display assembly and a second support layer away from the display assembly.

[0006] The first support layer comprises a plurality of first support ribs arranged at intervals along the first direction, and the second support layer comprises a plurality of second support ribs arranged at intervals along the first direction, the first support ribs and the second support ribs both extend along a second direction, and the second direction intersects the first direction.

[0007] Wherein, the interval between two adjacent first support ribs is a first interval, the interval between two adjacent second support ribs is a second interval, the ratio of the second interval to the first interval is greater than 1 and less than or equal to 20; and

[0008] The ratio of the thickness of the second support layer to the thickness of the first support layer is greater than or equal to 1 and less than or equal to 10.

[0009] In some embodiments, the support plate is divided into a plurality of periodic units, the plurality of periodic units are closely arranged along the first direction, different periodic units are translationally symmetrical along the first direction, and in the first direction, the periodic unit comprises a plurality of first support ribs and a plurality of second support ribs.

[0010] In some embodiments, the first support layer further comprises a connecting rib connected between two adjacent first support ribs, the connecting rib dividing a gap between the two adjacent first support ribs into a plurality of hollowed-out regions;

[0011] The plurality of hollowed-out regions arranged along the first direction comprises at least two of:

[0012] a blind hole region, a projection of the blind hole region on the second support layer being within a range of the second support rib;

[0013] a through hole region, a projection of the through hole region on the second support layer having no overlap with the second support rib; and

[0014] a semi-blind semi-through hole region, a projection of the semi-blind semi-through hole region on the second support layer partially overlapping with the second support rib.

[0015] In some embodiments, the plurality of hollowed-out regions arranged along the first direction comprises a plurality of pairs of semi-blind semi-through hole regions, each pair of semi-blind semi-through hole regions comprising two semi-blind semi-through hole regions arranged adjacent to each other along the first direction, and projections of the two semi-blind semi-through hole regions on the second support layer respectively overlapping with a same second support rib.

[0016] In some embodiments, the plurality of hollowed-out regions arranged along the first direction comprises a plurality of through hole regions, a plurality of blind hole regions, and a plurality of semi-blind semi-through hole regions;

[0017] wherein, in the first direction, two adjacent through hole regions are arranged with one blind hole region or two semi-blind semi-through hole regions therebetween.

[0018] In some embodiments, the plurality of blind hole regions comprises a first blind hole region and a second blind hole region, the first blind hole region and the second blind hole region being arranged along the first direction and being arranged staggered along the second direction;

[0019] the plurality of through hole regions comprises a first through hole region and a second through hole region, the first through hole region and the second through hole region being arranged along the first direction and being arranged staggered along the second direction;

[0020] the plurality of semi-blind semi-through hole regions comprises a first semi-blind semi-through hole region and a second semi-blind semi-through hole region, the first semi-blind semi-through hole region and the second semi-blind semi-through hole region being arranged along the first direction and being arranged staggered along the second direction;

[0021] In the first direction, two adjacent first via regions are separated by a first blind via region, two adjacent second via regions are separated by a second blind via region, and adjacent first and second via regions are separated by a first half-blind half-via region and a second half-blind half-via region.

[0022] In some embodiments, the plurality of hollow regions arranged along the first direction comprises a plurality of via regions and a plurality of blind via regions; and

[0023] In the first direction, a group of the via regions and a group of the blind via regions are arranged alternately, a group of via regions comprises a plurality of the via regions, and a group of the blind via regions comprises a plurality of the blind via regions.

[0024] In some embodiments, the plurality of blind via regions comprises a first blind via region and a second blind via region, the first blind via region and the second blind via region are arranged along the first direction and staggered along the second direction;

[0025] The plurality of via regions comprises a first via region and a second via region, the first via region and the second via region are arranged along the first direction and staggered along the second direction;

[0026] In the first direction, two adjacent first via regions are separated by a second via region, two adjacent second via regions are separated by a first via region, and adjacent first and second via regions are separated by a first blind via region and a second blind via region.

[0027] In some embodiments, the first support rib has a first edge towards the curled end of the support assembly and a second edge away from the curled end of the support assembly, the connecting ribs connected to the first edge are staggered along the second direction with the connecting ribs connected to the second edge.

[0028] In some embodiments, the first support rib has a first edge towards the curled end of the support assembly and a second edge away from the curled end of the support assembly, the connecting ribs connected to the first edge are equal in number to the connecting ribs connected to the second edge.

[0029] In some embodiments, in the direction of the first support layer pointing to the second support layer, the depth of the blind via region is greater than or equal to the thickness of the first support layer and less than or equal to half of the thickness of the support plate, wherein the thickness of the first support layer is the thickness of the first support rib without overlapping with the second support rib in the orthogonal projection on the second support layer.

[0030] In some embodiments, the first support layer is provided with a plurality of recessed regions away from the surface of the second support layer, the recessed regions are recessed towards the side close to the second support layer, the plurality of recessed regions are arranged at intervals, and the plurality of recessed regions are arranged in an array.

[0031] The first support rib is arranged between two adjacent recessed regions in the first direction, and the connecting rib is arranged between two adjacent recessed regions in the second direction, so that the first support layer is in a grid shape.

[0032] In some embodiments, the support plate is a metal support plate or a carbon fiber composite plate. In another aspect, a rollable display module is provided, characterized in that it comprises a display assembly and a support assembly connected to the back light side of the display assembly as described in any one of the aspects, and the display assembly and the support assembly can be stretched out or rolled back in the first direction.

[0033] In some embodiments, the display assembly comprises a display panel and a cover plate, and the cover plate is arranged on the side of the display panel away from the support assembly.

[0034] The cover plate comprises a first sub-layer and a second sub-layer arranged in layers, and the second sub-layer is closer to the display panel relative to the first sub-layer, the material of the first sub-layer comprises polyethylene terephthalate and / or transparent polyimide, and the material of the second sub-layer comprises thermoplastic polyurethane elastomer.

[0035] In some embodiments, the first sub-layer and the second sub-layer are thermally cured into an integral structure.

[0036] In another aspect, a display device is provided, characterized in that it comprises a rollable display module as described in any one of the aspects.

[0037] In some embodiments, the display device further comprises:

[0038] A first housing is provided with a drive shaft and a guide shaft inside, one end of the rollable display module is connected to the drive shaft, the rollable display module can be wound on the drive shaft, and in the retracted state, the support assembly is arranged close to the drive shaft.

[0039] During the switching of the rollable display module from the retracted state to the unfolded state, the rollable display module unwinds from the drive shaft, extends out of the first housing through the guide shaft, and in the unwinding process, the support assembly is arranged close to the guide shaft.

[0040] The support assembly provided by the embodiments of the present disclosure, the rollable display module and the display device, the support assembly comprises an integrally formed support plate, the support plate comprises a first support layer close to the display assembly and a second support layer away from the display assembly; the first support layer comprises a plurality of first support ribs arranged at intervals along a first direction, and the second support layer comprises a plurality of second support ribs arranged at intervals along the first direction, the first support ribs and the second support ribs both extend along a second direction, the second direction intersects the first direction; wherein the interval between two adjacent first support ribs is a first interval, the interval between two adjacent second support ribs is a second interval, the ratio of the second interval to the first interval is greater than 1 and less than or equal to 20; and the ratio of the thickness of the second support layer to the thickness of the first support layer is greater than or equal to 1 and less than or equal to 10. The second support ribs are used to support the display assembly in the second direction, and the first support ribs are used to form a relatively flat surface, which has the function of improving the impression. The integrally formed support plate has a reduced number of film layers compared with the structure in the related art, so the thickness is thinned, and the flatness of the display assembly is considered while the curling performance of the support assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0042] Figure 1 A schematic view of a display device provided by an embodiment of the present disclosure in a working state one;

[0043] Figure 2 A schematic view of a display device provided by an embodiment of the present disclosure in a working state two;

[0044] Figure 3 A cross-sectional view of Figure 1 A cross-sectional view of

[0045] Figure 4 A cross-sectional view of Figure 1 Another cross-sectional view of

[0046] Figure 5 A schematic view of a rollable display module partially wound on a driving shaft;

[0047] Figure 6 A cross-sectional view of Figure 5 A cross-sectional view of

[0048] Figure 7 A cross-sectional view of a support assembly provided by an embodiment of the present disclosure;

[0049] Figure 8 A perspective structural schematic view of a support plate provided by an embodiment of the present disclosure;

[0050] Figure 9 A partial film layer exploded view of a foldable display module in the related art; Figure 8 A partial enlarged view at I in FIG. 1;

[0051] Figure 10 A partial film layer exploded view of a foldable display module in the related art;

[0052] Figure 11 A planar structural schematic view of a support assembly provided by an embodiment of the present disclosure;

[0053] Figure 12 A partial film layer exploded view of a foldable display module in the related art; Figure 11 A cross-sectional structural schematic view at EE' in FIG. 1;

[0054] Figure 13 A cross-sectional structural schematic view of another support assembly provided by an embodiment of the present disclosure;

[0055] Figure 14 A partial film layer exploded view of a foldable display module in the related art; Figure 8 A cross-sectional view at D-D in FIG. 1;

[0056] Figure 15 A cross-sectional view of a cover plate. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure.

[0058] In the embodiments of the present disclosure, the same items or similar items with basically the same functions and effects are distinguished by using "first", "second", "third", "fourth", etc. only for clearly describing the technical solutions of the embodiments of the present disclosure, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.

[0059] In the embodiments of the present disclosure, the meaning of "multiple" is two or more than two, and the meaning of "at least one" is one or more than one, unless otherwise explicitly and specifically limited.

[0060] In embodiments of the present disclosure, the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0061] Some embodiments of the present disclosure provide a display device, which can be any device having a display function. For example, the display device can be a mobile phone, a wireless device, a personal data assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a video camera, a game console, a watch, a clock, a calculator, a television monitor, a flat panel display, a computer monitor, an automobile display (e.g., a speedometer display, etc.), a navigator, a cockpit controller and / or display, a display of a camera view (e.g., a display of a rear view camera in a vehicle), an electronic photo, an electronic billboard or sign, a projector, a building structure, a packaging and aesthetic structure (e.g., a display of an image of a piece of jewelry), and the like. In embodiments of the present disclosure, the display device is exemplified as a mobile phone.

[0062] Figure 1 A schematic view of a display device provided in an embodiment of the present disclosure in a working state one, Figure 2 A schematic view of a display device provided in an embodiment of the present disclosure in a working state two. As shown in Figure 1 and Figure 2 The display device 1000 includes a rollable display module 100, which displays an image through the rollable display module 100.

[0063] Exemplarily, the display device 1000 further includes a first housing 201 and a second housing 202, a first end of the rollable display module 100 is connected to the first housing 201, and a second end of the rollable display module 100 is connected to the second housing 202. The first housing 201 and the second housing 202 are used to support and connect the rollable display module 100. The display device 1000 can be a rollable display device 1000, which includes a retracted state and an unfolded state. Continuing to refer to Figure 1 and Figure 2 The working state one can be the retracted state, and the working state two can be the unfolded state. When the display device 1000 is in the retracted state, the area of the display module exposed is small, and at this time, the area of the display module used to display an image is small. When the display device 1000 is in the unfolded state, the area of the display module exposed is large, and at this time, the area of the display module used to display an image is large.

[0064] In the process of switching from the unfolded state to the retracted state, the first end of the rollable display module 100 is gradually rolled up and stored inside the first housing 201, and the second housing 202 gradually approaches the first housing 201; in the process of switching from the retracted state to the unfolded state, the second housing 202 moves away from the first housing 201, and the rollable display module 100 rolled up and stored in the first housing 201 gradually unfolds and extends out of the first housing 201.

[0065] Figure 3 For about Figure 1 A cross-sectional view at A-A. For example, as shown in Figure 3 The first housing 201 is provided with a drive shaft 204 and a guide shaft 205, one end of the rollable display module 100 is connected with the drive shaft 204, and the rollable display module 100 can be wound on the drive shaft 204. When the display device 1000 is in the retracted state, the first end of the rollable display module 100 is wound on the drive shaft 204, and the support assembly 120 is arranged close to the drive shaft 204; when the display device 1000 is switched from the retracted state to the unfolded state, the rollable display module 100 is unwound from the drive shaft 204 and extends out of the first housing 201 through the guide shaft 205. The support assembly 120 is arranged close to the guide shaft 205 during unwinding.

[0066] The rollable display module 100 has a first direction and a second direction, and the first direction and the second direction intersect. For example, the second direction is parallel to the direction of the drive shaft or the length direction of the rollable display module 100, and the first direction is the width direction of the rollable display module 100, and the first direction and the second direction are perpendicular to each other. The first end and the second end of the rollable display module 100 are oppositely arranged along the first direction.

[0067] Among them, the display device 1000 can be switched between the retracted state and the unfolded state by manual operation of the user, or automatically implemented by the display device 1000.

[0068] For example, when the user manually implements, the user can hold the second housing 202 and apply a force F to make the first housing 201 move along the first direction, so that the rollable display module 100 stored in the first housing 201 is exposed, thereby switching the display device 1000 from the retracted state to the unfolded state, and the first end of the rollable display module 100 applies an elastic force to the drive shaft 204 during unwinding; when the user removes the force F, the drive shaft 204 can rotate under the action of the elastic force to make the first end of the rollable display module 100 wind on the drive shaft 204, thereby switching the display device 1000 from the retracted state to the unfolded state.

[0069] Figure 4For about Figure 1 Another cross-sectional view at point AA. Exemplarily, the first housing 201 also houses a motor 207 and a transmission gear 206, with the output shaft of the motor 207 connected to the drive shaft 204 via the transmission gear 206. For example, when the display device 1000 automatically switches operating states, the motor 207 drives the drive shaft 204 to rotate, causing the first end of the rollable display module 100 to either wind around or unwind from the drive shaft 204.

[0070] For example, continue to refer to Figure 1 and Figure 2 The display device 1000 may further include a slide rail 203, one end of which is fixedly connected to the first housing 201, and the other end of which is fixedly connected to the second housing 202. The slide rail 203 can extend or shorten. For example, when the display device 1000 switches from a retracted state to an extended state, the slide rail 203 extends; when the display device 1000 switches from an extended state to a retracted state, the slide rail 203 shortens.

[0071] Figure 5 This is a schematic diagram showing a portion of the rollable display module 100 wound around the drive shaft 204. Figure 6 For about Figure 5 Cross-sectional view at point BB. (See diagram below.) Figure 5 and Figure 6 As shown, the rollable display module 100 includes a display component 110 and a support component 120 connected to the backlight side of the display component 110. The display component 110 has a light-emitting side that emits light, which is used to display images. The backlight side of the display component 110 is the side opposite to the light-emitting side. The support component 120 supports the display component 110, making it more flat. The support component 120 is connected to the backlight side of the display component 110 to support it, and the support component 120 can extend or roll back along a first direction together with the display component 110.

[0072] Continue to refer to Figure 5 When the rollable display module 100 is wound around the drive shaft 204, the support component 120 is closer to the drive shaft 204 than the display component 110. For example, in a multi-turn rollable display module 100 wound around the drive shaft 204, the support component 120 of the first turn contacts the drive shaft 204, the support component 120 of the second turn contacts the display component 110 of the first turn, and so on.

[0073] In the present disclosure, the radius of the driving shaft 204 and the number of turns of the flexible display module 100 wound on the driving shaft 204 in the retracted state are not limited. For example, the radius of the driving shaft 204 is 4 mm, and the flexible display module 100 is wound on the driving shaft 204 in the retracted state for 9 turns. The display area in the unfolded state is five times the display area in the retracted state.

[0074] In the related art, in order to make the display assembly more flat, it is usually necessary to increase the thickness of the support assembly. The increase in the thickness of the support assembly increases the overall thickness T of the flexible display module. The thicker the thickness T of the flexible display module, the greater the rebound force when winding, and the worse the curling performance of the flexible display module. In order to improve the curling performance, it is usually necessary to reduce the thickness of the support assembly. After the thickness of the support assembly is reduced, the flatness of the display assembly is poor. That is, the flexible display module in the related art cannot balance the curling performance and the flatness of the display assembly.

[0075] In view of this, the present disclosure provides a new support assembly 120, which balances the flatness of the display assembly 110 while reducing the thickness of the support assembly 120, thereby improving the curling performance of the flexible display module 100.

[0076] Figure 7 A cross-sectional view of a support assembly 120 according to an embodiment of the present disclosure is provided. As shown in Figure 7 The support assembly 120 includes a support plate 121.

[0077] With reference to Figure 7 In some embodiments, the support assembly 120 further includes a first buffer layer 122 and a second buffer layer 123. The first buffer layer 122 is connected between the support plate 121 and the display assembly 110, and the second buffer layer 123 is connected to a side of the support plate 121 away from the display assembly 110. The first buffer layer 122 is located on the backlight side of the display assembly 110. On the one hand, it can make the backlight side of the display assembly 110 more flat, thereby improving the mold mark problem of the display assembly 110. On the other hand, when the display assembly 110 is subjected to an impact force, it can play a buffering role, thereby protecting the display assembly 110. The second buffer layer 123 is located on the side of the support plate 121 away from the display assembly 110. When the flexible display module 100 is wound on the driving shaft 204, the second buffer layer 123 of the second turn is in contact with the display assembly 110 of the first turn, preventing the display assembly 110 from being scratched.

[0078] For example, with reference to Figure 7The first buffer layer 122 comprises, in sequence along a direction close to the support plate 121, a pressure sensitive adhesive (PSA) layer 122a, a foam layer 122b, and a pressure sensitive adhesive (PSA) layer 122c. The thickness of the pressure sensitive adhesive layer 122a (122c) can be 20 μm, and the thickness of the foam layer 122b can be 80 μm.

[0079] For example, with continued reference to Figure 7 The second buffer layer 123 comprises, in sequence along a direction away from the support plate 121, a pressure sensitive adhesive (PSA) layer 123a and a foam layer 123b. The thickness of the pressure sensitive adhesive layer 123a can be 35 μm, and the thickness of the foam layer 123b can be 80 μm.

[0080] Of course, the film layer composition and thickness of the first buffer layer 122 and the second buffer layer 123 can be flexibly set according to actual needs, and the above is only an exemplary description.

[0081] Figure 8 A structural schematic diagram of a support plate 121 provided by an embodiment of the present disclosure. Figure 9 For example, with reference to Figure 8 A local enlarged view of I in FIG. 8A. As shown in Figure 8 , Figure 9 , Figure 11 and Figure 12 The support plate 121 comprises a first support layer 81 close to the display assembly 110 and a second support layer 82 away from the display assembly 110; the first support layer 81 comprises a plurality of first support ribs 11 arranged at intervals along a first direction, and the second support layer 82 comprises a plurality of second support ribs 12 arranged at intervals along the first direction; the first support ribs 11 and the second support ribs 12 both extend along a second direction intersecting the first direction.

[0082] The ratio of the second interval p2 to the first interval p1 is greater than 1 and less than or equal to 20. Moreover, the ratio of the thickness of the second support layer 82 to the thickness of the first support layer 81 is greater than or equal to 1 and less than or equal to 10. Such a design can moderate the equivalent modulus of the support plate 121, thereby balancing the rollability and flatness of the display assembly.

[0083] For example, the surface of the first support layer 81 away from the second support layer 82 is bonded to the first buffer layer 122, and the surface of the second support layer 82 away from the first support layer 81 is bonded to the second buffer layer 123.

[0084] The thickness of the support plate 121 at the position of the second support rib 21 is thicker, and the rigidity is better, and it is not easy to bend; the thickness of the area between the two adjacent second support ribs 21 in the support plate 121 is thinner, and the rigidity is poorer, and it is easy to bend. When the support assembly 120 is curled, the area between the two adjacent second support ribs 21 bends. The second support rib 21 extends in the second direction, so that the second support rib 21 can support the display assembly 110 in the second direction, preventing the display assembly 110 from bending in the second direction.

[0085] The second support rib 21 can support the display assembly 110 in the second direction, and the area between the two adjacent second support ribs 21 is easy to bend, so that the resilience of the support plate 121 is smaller when the support assembly 120 is stretched out or curled back along the first direction, that is, the curling performance of the support assembly 120 is better.

[0086] Since the ratio of the second interval p2 to the first interval p1 is greater than 1 and less than or equal to 20, that is, the arrangement density of the first support rib 11 is greater than the arrangement density of the second support rib 21. The first support rib 11 is arranged close to the display assembly 110, and the closer the arrangement density of the first support rib 11, the smoother the side surface (i.e. the support surface) of the display assembly 110 close to the support plate 121, and the smoother the support surface, the more uniform the force on the backlight side of the display assembly 110, so that the display assembly 110 is not easy to produce a bad print.

[0087] Figure 10 A partial film layer exploded view of a related art curlable display module. As shown in Figure 10 The related art curlable display module includes a display assembly and a first support, a second support and a third support located on the backlight side of the display assembly. The third support is a hinge structure that can be elongated or shortened with the movement of the second housing 202. The second support includes a plurality of spaced support purlins for supporting the display assembly in the extension direction of the purlin and facilitating the curling of the display assembly and the second support. The first support is located between the second support and the display assembly, and is used to improve the flatness of the backlight side of the display assembly, thereby improving the print problem of the display assembly. Because the related art includes a first support, a second support and an adhesive connecting the first support and the second support, the thickness of the support assembly is relatively thick.

[0088] In the present disclosure, the second support rib 21 is used to support the display assembly 110 in the second direction, which can realize the function of the second support in the related art, and the first support rib 11 is used to form a relatively flat surface on the first side, which can realize the function of the first support in the related art to improve the print, that is, the support plate 121 of the integrated structure can realize the functions of the first support and the second support in the related art.

[0089] The support plate 121 in the embodiments of the present disclosure is an integrally formed structure. The integrally formed structure refers to a structure processed by an integrally forming process, including but not limited to stamping, casting, 3D printing, powder metallurgy, etching, injection molding, etc. The piece processed by the integrally forming process is a single part, rather than a combined piece formed by assembling or welding multiple parts.

[0090] Compared with the structure in the related art in which the first support, the adhesive, and the second support are stacked, the integrally formed support plate 121 has a reduced number of film layers, and thus a reduced thickness. While the flatness of the display assembly 110 is taken into account, the curling performance of the support assembly 120 is improved. Moreover, the number of parts in the support assembly 120 is reduced, so that the preparation process of the support assembly 120 is simpler, and the alignment process and the adhesive process of the first support and the second support in the related art are saved.

[0091] As shown in FIG. 1, the first support layer 81 and the second support layer 82 are arranged in the first direction and the second direction, and the first support layer 81 and the second support layer 82 are arranged in the first direction and the second direction. Figures 11 to 13 As shown in FIG. 1, the first support layer 81 and the second support layer 82 are arranged in the first direction and the second direction, and the first support layer 81 and the second support layer 82 are arranged in the first direction and the second direction.

[0092] In the first direction, the plurality of first support ribs 11 are arranged at equal intervals, the widths of different first support ribs 11 are the same, and the gap widths between any two adjacent first support ribs 11 are the same. The first interval p1 is equal to the sum of the width of one first support rib 11 in the first direction and the gap width between the two adjacent first support ribs 11.

[0093] In the first direction, the plurality of second support ribs 12 are arranged at equal intervals, the widths of different second support ribs 12 are the same, and the gap widths between any two adjacent second support ribs 12 are the same. The second interval p2 is equal to the sum of the width of one second support rib 12 in the first direction and the gap width between the two adjacent second support ribs 12.

[0094] For example, the ratio of the second interval p2 to the first interval p1 is greater than or equal to 2 and less than or equal to 5, and the ratio of the thickness of the second support layer 82 to the thickness of the first support layer 81 is greater than or equal to 1 and less than or equal to 5. Such a design can further optimize the curlability and the flatness of the display assembly.

[0095] For example, the ratio of the second interval p2 to the first interval p1 is 2.5, and the ratio of the thickness of the second support layer 82 to the thickness of the first support layer 81 is 3.

[0096] Exemplarily, a ratio of the width of the first support rib 11 in the first direction to the first interval p1 is greater than or equal to 1 / 4 and less than or equal to 3 / 4. The ratio of the width of the first support rib 11 in the first direction to the first interval p1 is greater than or equal to 1 / 4 and less than or equal to 3 / 4.

[0097] Exemplarily, the plurality of second support ribs 21 are independent strip structures, and the extension direction of the strip structure is the second direction. In the second support layer 82, no connecting structure can be arranged between the two adjacent second support ribs 21.

[0098] Exemplarily, as shown in Figures 11 to 13 , the support plate 121 is divided into a plurality of periodic units U, the plurality of periodic units U are closely arranged along the first direction, different periodic units U are translationally symmetrical along the first direction, and in the first direction, the periodic unit U includes a plurality of first support ribs 11 and a plurality of second support ribs 12. One periodic unit U is the smallest unit arranged periodically along the first direction.

[0099] In some embodiments, the first support layer 81 further includes a connecting rib 12, and the connecting rib 12 is connected between the two adjacent first support ribs 11.

[0100] The connecting rib 12 is connected between the two adjacent first support ribs 11, that is, the extension direction of the connecting rib 12 intersects with the extension direction of the first support rib 11, so that the connecting rib 12 can support the display assembly 110 in another direction other than the second direction. The contact area between the first support layer 81 and the first buffer layer 122 is increased, so that the side of the first buffer layer 122 facing the display assembly 110 is more flat, and the display assembly 110 is further improved in terms of mold printing defects.

[0101] Exemplarily, the connecting rib 12 extends along the first direction. When the support 121 is curled, the connecting rib 12 is bent.

[0102] In some embodiments, the connecting rib 12 divides the gap between the two adjacent first support ribs 11 into a plurality of hollowed-out areas. The first support rib 11 and the connecting rib 12 located at the periphery of the hollowed-out area can simultaneously support the display assembly 110, so that the backlight side of the display assembly 110 is more uniformly stressed, which is beneficial to improve the flatness of the display assembly 110 and improve the mold printing phenomenon.

[0103] In some embodiments, as shown in Figure 8 , Figures 11 to 13As shown, the plurality of hollow areas arranged along the first direction include at least two of the following: a blind hole area L3, the orthographic projection of the blind hole area L3 on the second support layer 82 being located within the range of the second support rib 12; a through hole area L2, the orthographic projection of the through hole area L2 on the second support layer 82 not overlapping with the second support rib 12; and a semi-blind and semi-through area L1, the orthographic projection of the semi-blind and semi-through area L1 on the second support layer 82 partially overlapping with the second support rib 12.

[0104] In one exemplary implementation, such as Figure 8 , Figure 11 and Figure 12 As shown, the multiple hollow areas arranged along the first direction include multiple pairs of semi-blind and semi-through areas L1. Each pair of semi-blind and semi-through areas L1 includes two semi-blind and semi-through areas L1 arranged adjacent to each other along the first direction. The orthographic projections of the two semi-blind and semi-through areas L1 arranged adjacent to each other along the first direction on the second support layer 82 overlap with the same second support rib 12.

[0105] In one exemplary implementation, such as Figure 8 , Figure 11 and Figure 12 As shown, the multiple hollow areas arranged along the first direction include multiple through-hole areas L2, multiple blind-hole areas L3, and multiple semi-blind / semi-through areas L1. Specifically, in the first direction, a blind-hole area L3 or two semi-blind / semi-through areas L1 are provided between two adjacent through-hole areas L2.

[0106] In one exemplary implementation, such as Figure 8 , Figure 11 and Figure 12 As shown, the multiple blind hole regions L3 include a first blind hole region L31 and a second blind hole region L32, which are arranged along a first direction and staggered along a second direction; the multiple through hole regions L2 include a first through hole region L21 and a second through hole region L22, which are arranged along a first direction and staggered along a second direction; the multiple semi-blind and semi-through regions L1 include a first semi-blind and semi-through region L11 and a second semi-blind and semi-through region L12, which are arranged along a first direction and staggered along a second direction.

[0107] In the first direction, a first blind hole area L31 is provided between two adjacent first through hole areas L21, a second blind hole area L32 is provided between two adjacent second through hole areas L22, and a first semi-blind semi-through area L11 and a second semi-blind semi-through area L12 are provided between adjacent first through hole areas L21 and second through hole areas L22.

[0108] In one exemplary implementation, such as Figure 8 , Figure 11 andFigure 12 As shown, one cycle unit U includes, in sequence along the first direction, a first semi-blind half-open region L11, a second semi-blind half-open region L12, a first via region L21, a first blind via region L31, a first via region L21, a second semi-blind half-open region L12, a first semi-blind half-open region L11, a second via region L22, a second blind via region L32, and a second via region L22.

[0109] In another exemplary embodiment, as shown in FIG. 6, the plurality of hollow regions arranged along the first direction includes a plurality of via regions L2 and a plurality of blind via regions L3; and in the first direction, a group of via regions L2 and a group of blind via regions L3 are arranged alternately, a group of via regions L2 includes a plurality of via regions L2 (such as three as shown in FIG. 6), and a group of blind via regions L3 includes a plurality of blind via regions L3 (such as two as shown in FIG. 6). Figure 13 Figure 13 Figure 13

[0110] In another exemplary embodiment, as shown in FIG. 6, the plurality of hollow regions arranged along the first direction includes a plurality of via regions L2 and a plurality of blind via regions L3; and in the first direction, a group of via regions L2 and a group of blind via regions L3 are arranged alternately, a group of via regions L2 includes a plurality of via regions L2 (such as three as shown in FIG. 6), and a group of blind via regions L3 includes a plurality of blind via regions L3 (such as two as shown in FIG. 6). Figure 13

[0111] In the first direction, one second via region L22 is arranged between two adjacent first via regions L21, one first via region L21 is arranged between two adjacent second via regions L22, and one first blind via region L31 and one second blind via region L32 are arranged between an adjacent first via region L21 and an adjacent second via region L22.

[0112] In another exemplary embodiment, as shown in FIG. 6, the plurality of hollow regions arranged along the first direction includes a plurality of via regions L2 and a plurality of blind via regions L3; and in the first direction, a group of via regions L2 and a group of blind via regions L3 are arranged alternately, a group of via regions L2 includes a plurality of via regions L2 (such as three as shown in FIG. 6), and a group of blind via regions L3 includes a plurality of blind via regions L3 (such as two as shown in FIG. 6). Figure 13

[0113] Exemplarily, in the direction in which the first support layer 81 points to the second support layer 82, the depth of the blind via region L3 is greater than (as shown in FIG. 6) or equal to (as shown in FIG. 7) the thickness of the first support layer 81, and is less than or equal to half of the thickness of the support plate 121, wherein the thickness of the first support layer 81 is the thickness of the first support rib 11 without overlapping with the second support rib 12 in the orthographic projection on the second support layer 82. Figure 13 Figure 12

[0114] ​​​​​​​Exemplarily, in the direction in which the first support layer 81 points to the second support layer 82, the first sub-area in the semi-blind semi-open area L1 partially penetrates the support plate 121, and the second sub-area completely penetrates the support plate 121. For example, the blind hole depth of the first sub-area is the same as the depth of the blind hole area L3, which can simplify the process.

[0115] With reference to the foregoing description Figure 8 In some embodiments, the first support rib 11 has a first edge facing the curled end of the support assembly 120 and a second edge away from the curled end of the support assembly 120. The connecting rib 12 connected to the first edge and the connecting rib 12 connected to the second edge are staggered along the second direction. The curled end of the support assembly 120 refers to the end of the support assembly 120 connected to the drive shaft 204, i.e., the first end.

[0116] Exemplarily, as Figure 8 shown, the connecting rib 12 connected to the first edge includes a first connecting rib 12A and a second connecting rib 12B, and the first connecting rib 12A and the second connecting rib 12B are adjacent along the second direction. The connecting rib 12 connected to the second edge includes a third connecting rib 12C. Along the second direction, the third connecting rib 12C is located in the middle of the first connecting rib 12A and the second connecting rib 12B.

[0117] The staggered arrangement of the connecting rib 12 along the second direction can make the force on the backlight side of the display assembly 110 more uniform. Of course, the connecting rib 12 connected to the first edge and the connecting rib 12 connected to the second edge can also be arranged flush along the second direction.

[0118] Exemplarily, the plurality of hollow areas located between two adjacent first support ribs 11 is a hollow area column. In the first direction, the hollow areas in the two adjacent hollow area columns are staggered along the second direction, and the hollow areas in the two hollow area columns arranged alternately can be arranged flush along the second direction. In this way, the force on the backlight side of the display assembly 110 can be more uniform.

[0119] In some embodiments, the number of connecting ribs 12 connected to the first edge is equal to the number of connecting ribs 12 connected to the second edge.

[0120] During the curling process of the support assembly 120, the connecting rib 12 is bent, and the connecting rib 12 generates an elastic force that can drive the connecting rib 12 to rebound during the bending process. The size of the elastic force is related to the number of connecting ribs 12. The more the number of connecting ribs 12, the greater the elastic force. When the number of connecting ribs 12 connected to the first edge is equal to the number of connecting ribs 12 connected to the second edge, the elastic force generated at each part of the support member 121 during the curling process of the support assembly 120 is approximately the same, thereby making the force on the display assembly 110 more uniform and less likely to produce a mold impression.

[0121] Of course, the number of connecting ribs 12 connected to the first side can also be different from the number of connecting ribs 12 connected to the second side, as long as the number of connecting ribs 12 connected to the first side is also small compared with the number of connecting ribs 12 connected to the second side.

[0122] Figure 14 For about Figure 8 Cross-sectional view at point DD. (See diagram below.) Figure 14 As shown, in some embodiments, the surface of the first support layer 81 away from the second support layer 82 is provided with a plurality of recessed regions 13. The recessed regions 13 are recessed towards the side closer to the second support layer 82, and the plurality of recessed regions 13 are arranged at intervals and in an array. A first support rib 11 is provided between two adjacent recessed regions in a first direction, and a connecting rib 12 is provided between two adjacent recessed regions 13 in a second direction, so that the first support layer 81 is in a grid shape.

[0123] For example, before the recessed area 13 is provided, the first side of the support plate 121 is a flat plane. By forming a recess on the surface of the first support layer 81 facing away from the second support layer 82, a first support rib 11 and a connecting rib 12 are formed. In this way, the surfaces of the first support rib 11 and the connecting rib 12 facing the display component 110 are relatively flat, increasing the contact area between the first support rib 11 and the connecting rib 12 and the first buffer layer 122, thereby making the surface of the first buffer layer 122 facing the display component 110 flatter.

[0124] The present invention does not specifically limit the depth H3 of the recessed region 13, and can be flexibly set according to actual needs. For example, when the recessed region 13 is opposite to the second support rib 21, the depth of the recessed region 13 is less than the maximum thickness of the support plate 121 to prevent the recessed region 13 from penetrating the second support rib 21 and affecting the rigidity of the second support rib 21.

[0125] In some embodiments, the recessed region 13, whose orthographic projection on the second support layer 82 does not overlap with the second support rib 12, penetrates the support plate 121 along the thickness direction of the support plate 121. The recessed region 13 penetrates the support plate 121 along the thickness direction of the support plate 121, that is, the recessed region 13 is hollowed out.

[0126] When the support assembly 120 is curled, the area between two adjacent second support ribs 21 bends, generating an elastic force in the bent area. The magnitude of the elastic force is related to the amount of material between the two adjacent second support ribs 21; the more material, the greater the elastic force. For example, the thicker the area between the two adjacent second support ribs 21, the greater the elastic force; the larger the surface area of ​​the area between the two adjacent second support ribs 21, the greater the elastic force. Surface area refers to the area of ​​the plane containing the first and second directions.

[0127] When the recessed regions 13 penetrate the support plate 121 along the thickness direction of the support plate 121, the area surface between two adjacent second support ribs 21 is reduced, the elastic force is reduced, and the support plate 121 is more likely to bend.

[0128] With reference to the foregoing Figure 11 In some embodiments, the plurality of recessed regions 13 are arranged in an array, and a first support rib 11 is arranged between two adjacent recessed regions in a first direction, and a connecting rib is arranged between two adjacent recessed regions in a second direction, so that the first support layer 81 is in a grid shape. The grid shape makes the stress of the display assembly 110 more uniform.

[0129] The recessed regions 13 or the hollow regions can have various shapes, such as a circular shape, an elliptical shape, a rectangular shape, a square shape, a waist-round shape, etc. In the embodiments of the present disclosure, the grid is a waist-round shape.

[0130] For example, with reference to the foregoing Figure 14 , the thickness of the support plate 121 is, for example, 0.4 mm, the thickness H1 of the first support layer 81 is, for example, 0.1 mm, and the thickness H2 of the second support layer is, for example, 0.3 mm. The width W1 of the first support rib 11 along the first direction is, for example, 0.25 mm, and the first interval p1 is 0.5 mm. The width W2 of the second support rib 21 along the first direction is 0.5 mm, the second interval P2 is 1.25 mm, and the depth H3 of the recessed region 13 is 0.1 mm. The width of the recessed region 13 along the first direction is the gap width between two adjacent first support ribs, for example, 0.25 mm. The ratio of the second interval p2 to the first interval p1 is 2.5, and the ratio of the thickness of the second support layer 82 to the thickness of the first support layer 81 is 3.

[0131] For example, with reference to the foregoing Figure 13 , the thickness of the support plate 121 is, for example, 0.4 mm, the thickness H1 of the first support layer 81 is, for example, 0.1 mm, and the thickness H2 of the second support layer is, for example, 0.3 mm. The width W1 of the first support rib 11 along the first direction is, for example, 0.75 mm, and the first interval p1 is 1.0 mm. The width W2 of the second support rib 21 along the first direction is 0.5 mm, the second interval P2 is 1.25 mm, and the depth H3 of the recessed region 13 is 0.2 mm. The width of the recessed region 13 along the first direction is the gap width between two adjacent first support ribs, for example, 0.25 mm. The ratio of the second interval p2 to the first interval p1 is 1.25, and the ratio of the thickness of the second support layer 82 to the thickness of the first support layer 81 is 3.

[0132] When the support plate 121 is a metal support plate 121, the recessed areas 13 can be formed by a metal etching process. For example, if the support plate 121 is a stainless steel plate, multiple recessed areas 13 can be formed on the first side of the support plate 121 by a metal etching process, and the unetched areas can form the first support ribs 11 and connecting ribs 12. The first support layer 81 is formed by a metal etching process, which is simple and has high precision.

[0133] For example, the second support ribs 21 in the second support layer 82 are also prepared by a metal etching process. For instance, multiple second support ribs 21 are formed on the second side of the support plate 121 by a metal etching process.

[0134] The structures of the first support layer 81 and the second support layer 82 are both prepared by metal etching process. Compared with the first support and the second support in related technologies, it is not necessary to align the first support and the second support, which reduces the difficulty of the process.

[0135] Of course, the support plate 121 can also be made of other materials, such as carbon fiber. In this case, the support plate 121 with an integral structure can be prepared by the carbon fiber preparation process.

[0136] Continue to refer to Figure 6 In some embodiments, the display assembly 110 includes a display panel 114 and a cover plate 111, the cover plate 111 being disposed on the side of the display panel 114 away from the support assembly 120, for including the display panel 114.

[0137] Figure 15 This is a cross-sectional view of a cover plate 111. (See figure) Figure 15 As shown, the cover plate 111 may include a first sub-layer 111a and a second sub-layer 111b stacked together. The second sub-layer 111b is closer to the display panel 114 than the first sub-layer 111a. The material of the first sub-layer 111a includes polyethylene terephthalate (PET) and / or colorless polyimide (CPI). The material of the second sub-layer 111b includes thermoplastic polyurethane (TPU).

[0138] For example, cover 111 includes a first sublayer 111a made of PET material and a second sublayer 111b made of TPU material; or, cover 111 includes a first sublayer 111a made of CPI material and a second sublayer 111b made of TPU material.

[0139] The cover plate 111 is formed by laminating a first sub-layer 111a and a second sub-layer 111b, and the material of the first sub-layer 111a is PET and / or CPI, and the material of the second sub-layer 111b is TPU, so as to improve the impact resistance of the display assembly 110.

[0140] In some embodiments, the first sub-layer 111a and the second sub-layer 111b are thermally cured into an integral structure. For example, when the cover plate 111 is prepared, the TPU material is coated on the surface of the first sub-layer 111a facing the display assembly 110, and then the first sub-layer 111a and the second sub-layer 111b are cured into one whole through a thermal curing process. After the first sub-layer 111a and the second sub-layer 111b are thermally cured into one whole, the impact resistance of the display assembly 110 can be improved.

[0141] In some embodiments, the thickness of the first sub-layer 111a is greater than or equal to 20 μm and less than or equal to 50 μm, and / or the thickness of the second sub-layer 111b is greater than or equal to 20 μm and less than or equal to 50 μm. At this time, the impact resistance of the cover plate 111 is better.

[0142] In some embodiments, the display assembly 110 further comprises a polarizer 113 and an optical adhesive layer 112, the polarizer 113 is located between the cover plate 111 and the display panel 114, and the optical adhesive layer 112 is bonded between the polarizer 113 and the cover plate 111, and the sum of the thicknesses of the polarizer 113 and the optical adhesive layer 112 is greater than or equal to 20 μm and less than or equal to 50 μm.

[0143] For example, continuing to refer to Figure 6 The display assembly 110 can further comprise a back film 115, the back film 115 is arranged between the display panel 114 and the first buffer layer 122. The rollable display module 100 further comprises a frame adhesive 101, the frame adhesive 101 is located at the edge of the rollable display module 100, one end of the frame adhesive 101 is bonded with the cover plate 111, and the other end of the frame adhesive 101 is bonded with the support assembly 120.

[0144] The above merely illustrates the specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which shall be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A support assembly for attachment to a backlight side of a display assembly to support the display assembly, and the support assembly being capable of being unrolled or retracted along a first direction with the display assembly, characterized in that, The support assembly includes an integrally formed support plate, the support plate including a first support layer close to the display assembly and a second support layer away from the display assembly; The first support layer includes a plurality of first support ribs spaced apart along the first direction, and the second support layer includes a plurality of second support ribs spaced apart along the first direction. Both the first support ribs and the second support ribs extend along a second direction, which intersects with the first direction. Wherein, the spacing between two adjacent first support ribs is the first spacing, the spacing between two adjacent second support ribs is the second spacing, and the ratio of the second spacing to the first spacing is greater than 1 and less than or equal to 20; and The ratio of the thickness of the second support layer to the thickness of the first support layer is greater than or equal to 1 and less than or equal to 10.

2. The support assembly of claim 1, wherein, The support plate is divided into multiple periodic units, which are closely arranged along the first direction. Different periodic units are translated symmetrically along the first direction, and in the first direction, each periodic unit includes multiple first support ribs and multiple second support ribs.

3. The support assembly of claim 1, wherein, The first support layer also includes connecting ribs, which connect two adjacent first support ribs and divide the gap between two adjacent first support ribs into multiple hollow areas. The plurality of hollowed-out areas arranged along the first direction include at least two of the following: Blind hole area, wherein the orthographic projection of the blind hole area on the second support layer is located within the range of the second support rib; The through-hole area, whose orthogonal projection on the second support layer does not overlap with the second support rib; as well as The semi-blind and semi-through area, the orthographic projection of the semi-blind and semi-through area on the second support layer overlaps with the second support rib portion.

4. The support assembly of claim 3, wherein, The plurality of hollowed-out areas arranged along the first direction include multiple pairs of semi-blind and semi-through areas. Each pair of semi-blind and semi-through areas includes two semi-blind and semi-through areas arranged adjacent to each other along the first direction. The orthographic projections of the two semi-blind and semi-through areas arranged adjacent to each other along the first direction on the second support layer overlap with the same second support rib.

5. The support assembly of claim 3, wherein, The plurality of hollow areas arranged along the first direction include a plurality of through-hole areas, a plurality of blind-hole areas, and a plurality of semi-blind and semi-through areas; In the first direction, a blind hole area or two semi-blind / semi-through areas are provided between two adjacent through hole areas.

6. The support assembly of claim 5, wherein, The plurality of blind hole regions include a first blind hole region and a second blind hole region, wherein the first blind hole region and the second blind hole region are arranged along the first direction and are staggered along the second direction; The plurality of through-hole regions include a first through-hole region and a second through-hole region, wherein the first through-hole region and the second through-hole region are arranged along the first direction and staggered along the second direction; The plurality of semi-blind and semi-through zones include a first semi-blind and semi-through zone and a second semi-blind and semi-through zone, the first semi-blind and semi-through zone and the second semi-blind and semi-through zone are arranged along the first direction and staggered along the second direction; In the first direction, two adjacent first through-hole regions are provided with a first blind-hole region, two adjacent second through-hole regions are provided with a second blind-hole region, and adjacent first and second through-hole regions are provided with a first semi-blind semi-through region and a second semi-blind semi-through region.

7. The support assembly of claim 3, wherein, The plurality of hollow regions arranged in the first direction includes a plurality of through-hole regions and a plurality of blind-hole regions; and In the first direction, a group of through-hole regions and a group of blind-hole regions are arranged alternately, a group of through-hole regions includes a plurality of through-hole regions, and a group of blind-hole regions includes a plurality of blind-hole regions.

8. The support assembly of claim 7, wherein, The plurality of blind-hole regions includes a first blind-hole region and a second blind-hole region, which are arranged in the first direction and staggered in the second direction; The plurality of through-hole regions includes a first through-hole region and a second through-hole region, which are arranged in the first direction and staggered in the second direction; In the first direction, two adjacent first through-hole regions are provided with a second through-hole region, two adjacent second through-hole regions are provided with a first through-hole region, and adjacent first and second through-hole regions are provided with a first blind-hole region and a second blind-hole region.

9. The support assembly of claim 3, wherein, The first support rib has a first edge towards the curled end of the support assembly and a second edge away from the curled end of the support assembly, the connecting rib connected to the first edge and the connecting rib connected to the second edge are staggered in the second direction.

10. The support assembly of claim 3, wherein, The first support rib has a first edge towards the curled end of the support assembly and a second edge away from the curled end of the support assembly, the connecting rib connected to the first edge and the connecting rib connected to the second edge are equal in number.

11. The support assembly of claim 3, wherein, In the direction in which the first support layer points to the second support layer, the depth of the blind-hole region is greater than or equal to the thickness of the first support layer and less than or equal to half the thickness of the support plate, wherein the thickness of the first support layer is the thickness of the first support rib without overlapping with the second support rib in the orthographic projection on the second support layer.

12. The support assembly of any one of claims 1 to 11, wherein, The surface of the first support layer away from the second support layer is provided with a plurality of recessed regions, the recessed regions are recessed towards the side close to the second support layer, the plurality of recessed regions are arranged at intervals, and the plurality of recessed regions are arranged in an array; In the first direction, two adjacent recessed regions are provided with the first support rib, and in the second direction, two adjacent recessed regions are provided with a connecting rib, so that the first support layer is in a grid shape.

13. The support assembly of any one of claims 1 to 11, wherein, The support plate is a metal support plate or a carbon fiber composite plate. 14.A rollable display module, characterized in that, The display assembly and the support assembly as claimed in any one of claims 1 to 13 are included, and the display assembly and the support assembly can be stretched out or curled back along the first direction. 15.The rollable display module of claim 14, wherein, The display assembly includes a display panel and a cover plate, and the cover plate is arranged on the side of the display panel away from the support assembly; The cover plate comprises a first sub-layer and a second sub-layer arranged in a stack, the second sub-layer is closer to the display panel relative to the first sub-layer, the material of the first sub-layer comprises polyethylene terephthalate and / or transparent polyimide, and the material of the second sub-layer comprises thermoplastic polyurethane elastomer. 16.The rollable display module of claim 15, wherein, The first sub-layer and the second sub-layer are thermally cured into an integrated structure.

17. A display device comprising: The foldable display module comprises any one of the cover plates according to claims 14 to 16.

18. The display device of claim 17, wherein, The display device further comprises: The first shell is internally provided with a driving shaft and a guide shaft, one end of the foldable display module is connected with the driving shaft, the foldable display module can be wound on the driving shaft, and in the retracted state, the support assembly is arranged close to the driving shaft; In the process that the foldable display module is switched from the retracted state to the unfolded state, the foldable display module is unwound from the driving shaft, extends out of the first shell through the guide shaft, and in the unwinding process, the support assembly is arranged close to the guide shaft.

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