Display device

Abstract

A display device (10), relating to the technical field of display. The display device (10) comprises: a reel (11) and a flexible display panel (12). When the reel (11) in the display device (10) rotates, the reel (11) can drive a curled display part (121) in the flexible display panel (12) to be wound on the reel (11), so that the size of the area of the flexible display panel (12) used for displaying a picture is reduced, and thus the display device is convenient to carry. Moreover, part of a bent connecting part (122) is reversely bent in an accommodating groove (C1) relative to the curled display part (121) wound on the reel (11), so that the bent connecting part (122) functions to reduce the bending stress of the curled display part (121), to reduce the strain of the curled display part (121) during curling.

Description

Display device

[0001] The present application claims priority from the Chinese patent application No. 202410675065.X filed on May 28, 2024 and entitled "Display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a display device. BACKGROUND

[0003] At present, the display device can use a flexible display panel as a display screen. Compared with a traditional display panel, the flexible display panel has the advantages of deformability, bendability and better flexibility.

[0004] The display device generally comprises a housing, a reel and a flexible display panel in the housing. The reel is capable of rotating by itself, and the flexible display panel is capable of being unfolded or rolled up under the driving of the reel. Thus, the display device has an unfolded state and a rolled-up state, so as to realize the size adjustment function of the display surface of the display device.

[0005] However, the above-mentioned flexible display panel is prone to failure. SUMMARY

[0006] The present application provides a display device. The technical solution is as follows:

[0007] According to an aspect of the present application, a display device is provided, comprising:

[0008] a reel, the reel having a receiving groove, the receiving groove having a first opening;

[0009] a flexible display panel, the flexible display panel having opposite display surfaces and a back surface, the flexible display panel comprising: a rolled display part and a curved connecting part extending from an edge of the rolled display part, the rolled display part being capable of being wound on the reel, at least part of the curved connecting part being located in the receiving groove via the first opening, and the curved connecting part being connected with the reel;

[0010] the receiving groove is configured to limit the bending direction of the curved connecting part located in the receiving groove, the protruding direction of the part of the curved connecting part located in the receiving groove being a first protruding direction, the protruding direction of the rolled display part wound on the reel being a second protruding direction, one of the first protruding direction and the second protruding direction being the direction in which the display surface is close to the back surface, and the other being the direction in which the display surface is away from the back surface.

[0011] Optionally, the accommodating groove has opposite first groove wall and second groove wall, the display surface of at least part of the curved connecting part is attached to the first groove wall, and the back surface of at least part of the curved connecting part is attached to the second groove wall.

[0012] Alternatively, the back surface of at least part of the curved connecting part is attached to the first groove wall, and the display surface of at least part of the curved connecting part is attached to the second groove wall.

[0013] Optionally, the accommodating groove comprises a first curved groove and a second curved groove, the first end of the second curved groove is communicated with the first curved groove, the second end of the second curved groove is communicated with the first opening, the first curved groove has opposite two first curved surfaces, and the second curved groove has opposite two second curved surfaces.

[0014] The protruding direction of the curved connecting part located in the second curved groove is the second protruding direction.

[0015] The protruding direction of the curved connecting part located in the first curved groove is the first protruding direction.

[0016] Optionally, the reel has an outer shaft wall, the first curved surface, the second curved surface and the outer shaft wall satisfy the following relationship: R3≤R2<R1.

[0017] Wherein, the R1 is the first curvature radius of the outer shaft wall, the R2 is the second curvature radius of the second curved surface, and the R3 is the third curvature radius of the first curved surface.

[0018] Optionally, the accommodating groove further comprises a strip-shaped groove, two ends of the strip-shaped groove are respectively communicated with the first curved groove and the second curved groove.

[0019] The strip-shaped groove has opposite two strip-shaped surfaces, and two ends of the strip-shaped surfaces are respectively tangent to the first curved surface and the second curved surface.

[0020] Optionally, the first curved surface and the second curved surface are tangent.

[0021] Optionally, the second curved surface of the second curved groove is connected with the outer shaft wall of the reel, and one end of the second curved surface away from the first curved surface is tangent to the outer shaft wall.

[0022] Optionally, the reel comprises a first shaft body and a second shaft body fixedly connected, in a first direction, the length of the first shaft body and the length of the second shaft body are both greater than the width of the curved connecting part, and the first direction is a direction parallel to the axis of the reel.

[0023] The first shaft body has a first shaft surface and a second shaft surface opposite in a second direction, and the second shaft body has a third shaft surface and a fourth shaft surface opposite in the second direction, the second direction being perpendicular to the axis of the reel;

[0024] The second shaft surface and the third shaft surface are complementary in shape, the second shaft surface is the first groove wall, the third shaft surface is the second groove wall, and the first shaft surface and the fourth shaft surface are spliced into the outer shaft wall of the reel.

[0025] Optionally, the reel comprises a first shaft body and a second shaft body fixedly connected, and in a first direction, the length of the first shaft body and the length of the second shaft body are both greater than the width of the curved connecting part, the first direction being parallel to the axis of the reel.

[0026] The first shaft body has an inner cavity, the second shaft body is located in the inner cavity, the outer wall of the second shaft body is complementary in shape to the cavity wall of the inner cavity, and the outer wall of the second shaft body is the first groove wall and the cavity wall of the inner cavity is the second groove wall, and the outer wall of the first shaft body is the outer shaft wall of the reel.

[0027] Optionally, one end of the curved connecting part away from the curled display part is connected to one end of the accommodating groove away from the first opening.

[0028] Optionally, the curved connecting parts located in the accommodating groove are bonded to the first groove wall and the second groove wall, respectively.

[0029] Optionally, the thickness of the curled display part is greater than or equal to the thickness of the curved connecting part.

[0030] Optionally, the curled display part comprises a cover layer, a polarizing layer, a touch display layer, a back film layer and a support layer which are stacked in sequence.

[0031] The curved connecting part comprises a first structure layer, a second structure layer and a third structure layer, the first structure layer and the polarizing layer are an integral structure, the second structure layer and the touch display layer are an integral structure, and the third structure layer and the back film layer are an integral structure.

[0032] Optionally, the flexible display panel further comprises an extension fixing part extending from the edge of the curved connecting part away from the curled display part.

[0033] The accommodating groove further has a second opening opposite to the first opening, at least part of the extension fixing part is located outside the accommodating groove via the second opening, and is fixedly connected to the outer shaft wall of the reel.

[0034] Optionally, the thickness of the curved connecting portion is greater than or equal to the thickness of the extending fixing portion.

[0035] Optionally, the curved display portion comprises a cover layer, a polarizing layer, a touch display layer, a back film layer and a support layer which are stacked in sequence.

[0036] The curved connecting portion comprises a first structure layer, a second structure layer and a third structure layer, the first structure layer is an integral structure with the polarizing layer, the second structure layer is an integral structure with the touch display layer, and the third structure layer is an integral structure with the back film layer.

[0037] The extending fixing portion comprises a fourth structure layer, and the fourth structure layer is an integral structure with at least the third structure layer.

[0038] Optionally, the bending angle of the extending fixing portion ranges from 40° to 50°.

[0039] Optionally, the outer wall of the reel has a first step, and one end of the curved connecting portion extends out of the first opening and is connected with the curved display portion.

[0040] The first step comprises a first table face, a first bottom face and a first side face connecting the first table face and the first bottom face, the curved connecting portion is located on the first table face, and the curved display portion is located on the first bottom face.

[0041] Optionally, the height of the first step is consistent with the thickness of the support layer.

[0042] Optionally, the curved connecting portion comprises a forward bending portion and a reverse bending portion which are away from the curved display portion, the forward bending portion is located in the second curved groove, and the reverse bending portion is located in the first curved groove.

[0043] The forward bending portion is respectively fitted with two second curved surfaces of the second curved groove, and the reverse bending portion is respectively fitted with a first curved surface of the first curved groove.

[0044] The bending angle of the forward bending portion ranges from 70° to 100°, and the bending angle of the reverse bending portion ranges from 70° to 100°.

[0045] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0046] A display device including a scroll and a flexible display panel is provided. When the scroll in the display device rotates, it can cause the curled display portion of the flexible display panel to wind around the scroll, thereby reducing the size of the area of ​​the flexible display panel used for displaying the image, making it easier to carry. Furthermore, by bending a portion of the curved connecting part in a receiving groove in the opposite direction to the curled display portion wound on the scroll, the curved connecting part can reduce the bending stress of the curled display portion, thereby reducing the strain of the curled display portion during winding, lowering the probability of failure of the flexible display panel, and improving the display effect of the flexible display panel after repeated winding. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 is a partial structural diagram of a display device;

[0049] Figure 2 is a schematic diagram of the display device shown in Figure 1 in a retracted state;

[0050] Figure 3 is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0051] Figure 4 is a cross-sectional structural diagram of the display device shown in Figure 3 along the A1-A2 position;

[0052] Figure 5 is a schematic diagram of the structure of a portion of the curled display section in the display device shown in Figure 4, which is wound on a scroll.

[0053] Figure 6 is a structural schematic diagram of a scroll provided in an embodiment of this application;

[0054] Figure 7 is a structural schematic diagram of a flexible display panel provided in an embodiment of this application;

[0055] Figure 8 is a schematic diagram of another display device provided in an embodiment of this application;

[0056] Figure 9 is a schematic diagram of the structure of the scroll in the display device shown in Figure 8;

[0057] Figure 10 is a schematic diagram of another display device provided in an embodiment of this application;

[0058] Figure 11 is a schematic diagram of the structure of the scroll in the display device shown in Figure 10;

[0059] Figure 12 is a schematic diagram of another display device provided in an embodiment of this application;

[0060] Figure 13 is a schematic diagram of the structure of the scroll in the display device shown in Figure 12;

[0061] Figure 14 is a schematic diagram of another display device provided in an embodiment of this application;

[0062] Figure 15 is a schematic diagram of the structure of the scroll in the display device shown in Figure 14;

[0063] Figure 16 is a schematic diagram of a flexible display panel after unfolding according to an embodiment of this application;

[0064] Figure 17 is a schematic diagram of the flexible display panel shown in Figure 16 wound on a roller;

[0065] Figure 18 is a schematic diagram of the simulation results of a flexible display panel in the related technology;

[0066] Figure 19 is a schematic diagram of the simulation results of a flexible display panel provided in an embodiment of this application;

[0067] Figure 20 is a schematic diagram of another display device provided in an embodiment of this application;

[0068] Figure 21 is a schematic diagram of another display device provided in an embodiment of this application;

[0069] Figure 22 is a schematic diagram of the unfolded flexible display panel in the display device shown in Figure 21;

[0070] Figure 23 is a schematic diagram of another display device provided in an embodiment of this application;

[0071] Figure 24 is a schematic diagram of another display device.

[0072] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0074] Please refer to Figures 1 and 2. Figure 1 is a partial structural schematic diagram of a display device 20, and Figure 2 is a structural schematic diagram of the display device 20 in its retracted state. The display device 20 in Figure 1 is in its unfolded state. The display device 20 includes a housing (not shown in the figures), a scroll 21 located inside the housing, and a flexible display panel 22. The display device 20 can use the scroll 21 to unfold or roll up the flexible display panel 22. The scroll 21 itself is rotatable, and one end of the flexible display panel 22 is fixedly connected to the scroll 21, so that the flexible display panel 22 can be unfolded or rolled up under the drive of the scroll 21. Thus, the display device 20 has an unfolded state and a retracted state, enabling the adjustment of the display surface size.

[0075] However, when the flexible display panel 22 is wound on the rotating shaft, the film layer on the flexible display panel 22 will generate stress and strain during the bending process, which makes the flexible display panel 22 more prone to problems such as film layer breakage and adhesive layer peeling.

[0076] Please refer to Figures 3, 4 and 5. Figure 3 is a structural schematic diagram of a display device 10 provided in an embodiment of this application. Figure 4 is a cross-sectional structural schematic diagram of the display device 10 shown in Figure 3 along the A1-A2 position. Figure 5 is a structural schematic diagram of a portion of the rolled display portion 121 in the display device 10 shown in Figure 4 wound on the scroll 11. The display device 10 may include: scroll 11 and flexible display panel 12.

[0077] Please refer to Figure 6, which is a schematic diagram of the structure of a scroll 11 provided in an embodiment of this application. The scroll 11 may have a receiving groove C1, and the receiving groove C1 may have a first opening k1. The receiving groove C1 may be located inside the scroll 11, and the first opening k1 may be located on the outer wall D1 of the scroll 11.

[0078] The flexible display panel 12 may have a display surface p1 and a back surface p2, with the back surface p2 being the non-display surface. The flexible display panel 12 may include a rollable display portion 121 and a curved connecting portion 122 extending from the edge of the rollable display portion 121. The rollable display portion 121 can be wound onto a scroll 11. At least a portion of the curved connecting portion 122 is located in a receiving groove C1 via a first opening k1, and the curved connecting portion 122 is connected to the scroll 11. The rollable display portion 121 and the curved connecting portion 122 may be an integral structure. The display surface p1 of the flexible display panel 12 may have a display area and a non-display area. The rollable display portion 121 may belong to the display area, and the curved connecting portion 122 may belong to the non-display area. That is, when the display device 10 is in an unfolded state, the rollable display portion 121 can display an image (such as a picture or video), and when the display device 10 is in a retracted state, the rollable display portion 121 may not display an image. When the display device 10 is in the unfolded or retracted state, the bent connecting part 122 may not display any image.

[0079] The curved connecting portion 122 can extend from the first edge of the rollable display portion 121. The first edge can be parallel to the length direction of the first opening k1, and the length direction of the first opening k1 is parallel to the axis of the scroll 11. The curved connecting portion 122 can be fixedly connected to the scroll 11. For example, the curved connecting portion 122 can be bonded to the scroll 11.

[0080] Please refer to Figure 7, which is a structural schematic diagram of a flexible display panel 12 provided in an embodiment of this application. The flexible display panel 12 shown in Figure 7 is in a state where at least part of the flexible display panel 12 is wound on a roller 11. The roller 11 and the film layer structure of the flexible display panel 12 are not shown in Figure 7, so as to more clearly show the display surface p1 and the back surface p2 of the flexible display panel 12. The solid line is used to represent the back surface p2 of the flexible display panel 12, and the dashed line is used to represent the display surface p1 of the flexible display panel 12.

[0081] Referring to Figures 6 and 7, the receiving groove C1 can be configured to define the bending direction of the bent connecting portion 122 located in the receiving groove C1. The protruding direction of the portion of the bent connecting portion 122 located in the receiving groove C1 is a first protruding direction, and the protruding direction of the curled display portion 121 wound on the scroll 11 is a second protruding direction. One of the first and second protruding directions is the direction in which the display surface p1 is close to the back surface p2, and the other protruding direction is the direction in which the display surface p1 is away from the back surface p2. The bending direction of the portion of the bent connecting portion 122 located in the receiving groove C1 can be opposite to the bending direction of the curled display portion 121 wound on the scroll 11. For example, as shown in Figure 7, at least a portion of the display surface p1 in the bent connecting portion 122 is concave, and the display surface p1 of the curled display portion 121 wound on the scroll 11 is convex.

[0082] In this embodiment of the application, as shown in FIG4, the flexible display panel 12 may further include a flat display section 124 located at one end of the rollable display section 121 away from the curved connecting section 122 and connected to the rollable display section 121. The flat display section 124 may be fixedly connected to the housing (not shown in the figure) of the display device 10.

[0083] As shown in Figures 4, 5, and 6, when the scroll 11 in the display device 10 rotates clockwise, the rollable display portion 121 in the flexible display panel 12 can gradually extend, causing most areas of the display surface p1 of the flat display portion 124 and the display surface p1 of the rollable display portion 121 to lie in the same plane (increasing the size of the area of ​​the flexible display panel 12 used for displaying the image), and thus enabling the display of the image. When the scroll 11 in the display device 10 rotates counterclockwise, the scroll 11 can drive the rollable display portion 121 in the flexible display panel 12 to wind around the scroll 11, reducing the size of the area of ​​the flexible display panel 12 used for displaying the image, thereby making it easier to carry. Furthermore, the bending direction of the partially bent connecting portion 122 is defined by the receiving groove C1 in the scroll 11 as being opposite to the bending direction of the rolled display portion 121 wound on the scroll 11. That is, by bending the partially bent connecting portion 122 in the receiving groove C1 relative to the rolled display portion 121 wound on the scroll 11, the bent connecting portion 122 can reduce the bending stress of the rolled display portion 121, thereby reducing the strain generated by the rolled display portion 121 during winding. This avoids problems such as film layer breakage and adhesive layer peeling in the flexible display panel 12 due to winding, improves the bending resistance of the flexible display panel 12, reduces the probability of film layer failure in the flexible display panel 12, and improves the display effect of the display device 10. It should be noted that in this embodiment, the scroll rotates clockwise to unfold the flexible display panel. Those skilled in the art can set the scroll to rotate counterclockwise to unfold the flexible display panel according to actual needs. This embodiment does not limit this.

[0084] In summary, this application provides a display device comprising a scroll and a flexible display panel. When the scroll in the display device rotates, it can cause the curled display portion of the flexible display panel to wind around the scroll, thereby reducing the size of the area of ​​the flexible display panel used for displaying the image, making it easier to carry. Furthermore, by bending a portion of the curved connecting part in the receiving groove in the opposite direction to the curled display portion wound on the scroll, the curved connecting part can reduce the bending stress of the curled display portion, thereby reducing the strain of the curled display portion during winding, lowering the probability of failure of the flexible display panel, and improving the display effect of the flexible display panel after repeated winding.

[0085] In an alternative embodiment, referring to Figures 5 and 6, the receiving groove C1 may have opposing first groove walls c11 and second groove walls c12. At least a portion of the display surface p1 of the bent connecting portion 122 is fitted with the first groove wall c11, and at least a portion of the back surface p2 of the bent connecting portion 122 is fitted with the second groove wall c12. Alternatively, at least a portion of the back surface p2 of the bent connecting portion 122 is fitted with the first groove wall c11, and at least a portion of the display surface p1 of the bent connecting portion 122 is fitted with the second groove wall c12. Thus, the receiving groove C1 can hold at least a portion of the bent connecting portion 122 between the first groove wall c11 and the second groove wall c12, so that the shape of the bent connecting portion 122 is jointly defined by the first groove wall c11 and the second groove wall c12.

[0086] In an alternative embodiment, referring to Figures 5 and 6, the end of the curved connecting portion 122 of the flexible display panel 12 away from the rolled display portion 121 is connected to the end of the receiving groove C1 away from the first opening k1. Thus, the curved connecting portion 122 of the flexible display panel 12 can fill the receiving groove C1, and the shape of the curved connecting portion 122 located in the receiving groove C1 can be similar to the shape of the receiving groove C1.

[0087] Please refer to Figures 8 and 9. Figure 8 is a structural schematic diagram of another display device 10 provided in an embodiment of this application, and Figure 9 is a structural schematic diagram of the scroll 11 in the display device 10 shown in Figure 8. Figures 8 and 5, and Figures 9 and 6 can be schematic diagrams of the same structure divided in different ways. In an optional embodiment, the receiving groove C1 may include a first curved groove B1 and a second curved groove B2. The first end of the second curved groove B2 is connected to the first curved groove B1, and the second end of the second curved groove B2 is connected to the first opening k1. The first curved groove B1 has two opposing first curved surfaces b11, and the second curved groove B2 has two opposing second curved surfaces b21. The protrusion direction of the bent connecting portion 122 located in the second curved groove B2 is the second protrusion direction; the protrusion direction of the bent connecting portion 122 located in the first curved groove B1 is the first protrusion direction. The two opposing first curved surfaces b11 of the first curved groove B1 are parallel, and the two opposing second curved surfaces b21 of the second curved groove B2 are also parallel. It is understood that in the embodiments of this application, the parallelism of the two first surfaces b11 means that the two first surfaces b11 have similar shapes and are parallel within a certain tolerance range. Similarly, the parallelism of the two second surfaces b21 means that the two second surfaces b21 have similar shapes and are parallel within a certain tolerance range.

[0088] In an optional embodiment, the curved connecting portion 122 may include a forward curved portion 1224 and a reverse curved portion 1225 connected sequentially in a direction away from the curled display portion 121. The forward curved portion 1224 may be located in the second curved groove B2, and the reverse curved portion 1225 may be located in the first curved groove B1. The forward curved portion 1224 is respectively attached to the two second curved surfaces b21 of the second curved groove B2, and the reverse curved portion 1225 is respectively attached to the first curved surface b11 of the first curved groove B1.

[0089] The second curved groove B2 can clamp the forward curved portion 1224 between the two second curved surfaces b21, so that the shape of the forward curved portion 1224 is defined by the two second curved surfaces b21. The first curved groove B1 can clamp the reverse curved portion 1225 between the two first curved surfaces b11, so that the shape of the reverse curved portion 1225 is defined by the two first curved surfaces b11.

[0090] The bending direction of the forward bending portion 1224 located in the second curved groove B2 can be the same as the bending direction of the curled display portion 121 wound on the scroll 11, and the bending direction of the reverse bending portion 1225 located in the first curved groove B1 can be opposite to the bending direction of the curled display portion 121 wound on the scroll 11. Thus, the forward bending portion 1224 located in the second curved groove B2 can serve as a transition structure between the curled display portion 121 and the reverse bending portion 1225. The forward bending portion 1224 can act as a transition and gradual change between the curled display portion 121 and the reverse bending portion 1225, thereby reducing the bending stress of the flexible display panel 12 during bending and avoiding stress concentration at the connection between the curled display portion 121 and the reverse bending portion 1225 caused by abrupt changes in the bending direction. This prevents cracks or splits from forming in the flexible display panel 12 during bending, thus improving the quality of the flexible display panel 12.

[0091] In this embodiment, the bending directions of multiple portions of the flexible display panel 12 are the same or opposite. This can be understood as the protrusion directions of the flexible display panel 12 being the same or the same but opposite. This is because when two portions of the flexible display panel 12 have the same protrusion direction, the misalignment directions of the multiple film layers in these two portions are the same, that is, the directions of the strain generated by these two portions are the same. Therefore, these two portions that generate strain in the same direction can be regarded as two portions with the same bending direction. Of course, these two portions can also be three or more portions, and this embodiment does not limit this. Similarly, if the directions of the strain generated by two portions are opposite, it can be considered that the bending directions of these two portions are opposite. For example, referring to Figures 7 and 8, since the protrusion direction of the forward curved portion 1224 is the direction from the back side p2 to the front side p1, and the protrusion direction of the curled display portion 121 is also the direction from the back side p2 to the front side p1, the bending direction of the forward curved portion 1224 is the same as the bending direction of the curled display portion 121. Similarly, since the protrusion direction of the reverse curved portion 1225 is the direction from the front side p1 to the back side p2, the bending direction of the reverse curved portion 1225 is opposite to the bending direction of the curled display portion 121.

[0092] In one exemplary embodiment, when the display device 10 is in a retracted state, the number of turns of the curled display portion 121 on the scroll 11 can be greater than or equal to 2, and at least one of the forward bending portion 1224 and the reverse bending portion 1225 can be bonded to the first groove wall c11 and the second groove wall c12 of the receiving groove C1.

[0093] Please refer to Figures 8 and 9. In one optional embodiment, the spool 11 has an outer wall D1, a first curved surface b11 of the first curved groove B1, a second curved surface b21 of the second curved groove B2, and an outer wall D1 of the spool 11, which satisfy the following relationship: R3≤R2<R1.

[0094] Wherein, R1 is the first radius of curvature of the outer wall D1 of the scroll 11, R2 is the second radius of curvature of the second surface b21 of the second curved groove B2, and R3 is the third radius of curvature of the first surface b11 of the first curved groove B1.

[0095] The radius of curvature of the flexible display panel 12 during bending is negatively correlated with the degree of bending; that is, the larger the radius of curvature of the flexible display panel 12, the smaller the degree of bending. Conversely, the degree of bending of the flexible display panel 12 is positively correlated with the strain generated during bending; that is, the smaller the degree of bending, the smaller the strain generated. Therefore, it can be concluded that the radius of curvature of the flexible display panel 12 and the strain generated during bending are negatively correlated; that is, the larger the radius of curvature of the flexible display panel 12, the smaller the strain generated during bending.

[0096] In this embodiment, the third radius of curvature R3 of the first curved surface b11 of the first curved groove B1 is smaller than the first radius of curvature R1 of the outer wall D1 of the scroll 11. That is, the curvature of the first curved surface b11 of the first curved groove B1 is greater than the curvature of the outer wall D1 of the scroll 11. This allows the curvature of the reverse bending portion 1225 located in the first curved groove B1 to be greater than the curvature of the curled display portion 121 wound on the scroll 11. Thus, the strain generated by the reverse bending portion 1225 located in the first curved groove B1 during bending can be reduced, thereby reducing the strain of the curled display portion 121 during curling. This can improve the bending resistance of the flexible display panel 12, reduce the probability of film layer failure in the flexible display panel 12, and improve the display effect of the display device 10.

[0097] Furthermore, the third radius of curvature R3 of the first curved surface b11 of the first curved groove B1 can be less than or equal to the second radius of curvature R2 of the second curved surface b21 of the second curved groove B2. That is, the curvature of the first curved surface b11 of the first curved groove B1 can be greater than or equal to the curvature of the second curved surface b21 of the second curved groove B2, so that the curvature of the reverse curved portion 1225 located in the first curved groove B1 can be greater than or equal to the curvature of the forward curved portion 1224 located in the second curved groove B2.

[0098] Alternatively, the third radius of curvature R3 of the first curved surface b11 of the first curved groove B1 can be smaller than the second radius of curvature R2 of the second curved surface b21 of the second curved groove B2. That is, the curvature of the first curved surface b11 of the first curved groove B1 can be greater than the curvature of the second curved surface b21 of the second curved groove B2, so that the curvature of the reverse curved portion 1225 located in the first curved groove B1 can be greater than the curvature of the forward curved portion 1224 located in the second curved groove B2.

[0099] The second radius of curvature R2 of the second curved surface b21 of the second curved groove B2 can also be smaller than the first radius of curvature R1 of the outer wall D1 of the spool 11. That is, the curvature of the second curved surface b21 of the second curved groove B2 can be greater than the curvature of the outer wall D1 of the spool 11, so that the curvature of the forward curved portion 1224 located in the second curved groove B2 can be greater than the curvature of the curled display portion 121 wound on the spool 11. In this way, the film layer stress between the forward curved portion 1224 and the reverse curved portion 1225 and the curled display portion 121 can be used to ensure that the reverse curved portion 1225 located in the first curved groove B1 generates the strain generated during bending, which can reduce the strain generated when the curled display portion 121 is wound on the spool 11. Furthermore, the strain of the curved connecting portion 122 located in the receiving groove C1 is less than or equal to the strain of the curled display portion 121 wound on the spool 11.

[0100] Referring to Figures 8 and 9, in an optional embodiment, the receiving groove C1 may further include a strip groove B3, with both ends of the strip groove B3 communicating with the first curved groove B1 and the second curved groove B2, respectively. The strip groove B3 may have two opposing strip surfaces b31, with both ends of the strip surface b31 being tangent to the first curved surface b11 and the second curved surface b21, respectively. The strip groove B3 is located between the first curved groove B1 and the second curved groove B2, and the strip groove B3 can serve as a gradual transition, allowing the first curved groove B1 and the second curved groove B2 to be smoothly connected.

[0101] The curved connection portion 122 may further include a transition portion 1226 located between the forward curved portion 1224 and the reverse curved portion 1225. The two ends of the transition portion 1226 can be connected to the forward curved portion 1224 and the reverse curved portion 1225 respectively. The transition portion 1226 can be located in the strip groove B3. When at least a portion of the curved connection portion 122 is located in the receiving groove C1, the forward curved portion 1224 located in the second curved groove B2 and the reverse curved portion 1225 located in the first curved groove B1 can smoothly transition through the transition portion 1226 located in the strip groove B3. This makes the bending process of the curved connection portion 122 more gradual, avoiding stress concentration on the curved connection portion 122 and further reducing the risk of breakage failure of the flexible display panel 12.

[0102] In one exemplary embodiment, referring to Figures 8 and 9, the bending angle range of the first curved surface b11 of the first curved groove B1 can be 70° to 100°, and the bending angle range of the second curved surface b21 of the second curved groove B2 can be 70° to 100°. For example, the bending angle of the first curved surface b11 of the first curved groove B1 can be 70°, 80°, 85°, 90°, or 95°, and the bending angle of the second curved surface b21 of the second curved groove B2 can be 70°, 75°, 80°, 85°, or 93°. Since the first curved groove B1 is used to define the bending shape of the reverse bending portion 1225, and the second curved groove B2 is used to define the bending shape of the forward bending portion 1224, the bending angle range of the reverse bending portion 1225 can be 70° to 100°, and the bending angle range of the forward bending portion 1224 can be 70° to 100°.

[0103] For example, the first radius of curvature R1 of the outer wall D1 of the scroll 11, the second radius of curvature R2 of the second surface b21 of the second curved groove B2, and the third radius of curvature R3 of the first surface b11 of the first curved groove B1 can satisfy the following relationship: R1 = 1.5*R2 ~ 2*R2, R2 > R3, R3 > 0.5*R1. Within this range, the problem that the radius of curvature of the curved connecting portion 122 located in the receiving groove C1 is too small, resulting in the strain of the curved connecting portion 122 being too large compared with the strain of the rolled display portion 121, can be avoided.

[0104] Please refer to Figures 10 and 11. Figure 10 is a schematic diagram of another display device 10 provided in an embodiment of this application, and Figure 11 is a schematic diagram of the scroll 11 in the display device 10 shown in Figure 10. In an exemplary embodiment, the scroll 11 may also have a transition outer wall D2. The transition outer wall D2 may be located between the second curved surface b21 of the second curved groove B2 and the axial outer wall D1 of the scroll 11. The two ends of the transition outer wall D2 are respectively connected to the second curved surface b21 of the second curved groove B2 and the axial outer wall D1 of the scroll 11, and the two ends of the transition outer wall D2 are respectively tangent to the second curved surface b21 of the second curved groove B2 and the axial outer wall D1 of the scroll 11. The fourth radius of curvature R4 of the transition outer wall D2 of the scroll 11 and the second radius of curvature R2 of the second curved surface b21 of the second curved groove B2 can satisfy the following relationship: R4 = 0.6*R2 ~ 0.8*R2. By connecting the second curved surface b21 and the outer wall of the shaft D1 through the transition outer wall D2, the flexible display panel 12 can smoothly transition from the receiving groove C1 to the outside of the roll 11, and can bend gently between the receiving groove C1 and the outer wall of the shaft D1. This can avoid stress concentration at the junction of the bent connection part 122 and the rolled display part 121, and further reduce the risk of breakage failure of the flexible display panel 12.

[0105] Please refer to Figures 12 and 13. Figure 12 is a schematic diagram of the structure of another display device 10 provided in an embodiment of this application, and Figure 13 is a schematic diagram of the structure of the scroll 11 in the display device 10 shown in Figure 12. In an optional embodiment, the first curved surface b11 of the first curved groove B1 and the second curved surface b21 of the second curved groove B2 are tangent to each other. In this way, the forward bending portion 1224 located in the second curved groove B2 and the reverse bending portion 1225 located in the first curved groove B1 can smoothly transition, so that the bending connection portion 122 changes the bending direction more gently during the bending process, which can avoid the problem of stress concentration on the bending connection portion 122 and further reduce the risk of breakage failure of the flexible display panel 12.

[0106] For example, the bending angle of the first curved surface b11 of the first curved groove B1 can be 160° to 180°, and the bending angle of the second curved surface b21 of the second curved groove B2 can also be 160° to 180°. For example, the bending angle of the first curved surface b11 of the first curved groove B1 can be 160°, 168°, 172°, 177°, or 180°, and the bending angle of the second curved surface b21 of the second curved groove B2 can be 160°, 165°, 172°, 175°, or 180°. Since the first curved groove B1 is used to define the bending shape of the reverse bending portion 1225, and the second curved groove B2 is used to define the bending shape of the forward bending portion 1224, the bending angle of the forward bending portion 1224 can be 160° to 180°, and the bending angle of the reverse bending portion 1225 can be 180°.

[0107] At least one of the forward bending portion 1224 and the reverse bending portion 1225 can be bonded to the first groove wall c11 and the second groove wall c12 of the receiving groove C1. By having the first curved surface b11 of the first curved groove B1 and the second curved surface b21 of the second curved groove B2 tangent to each other, the bonding area between the bending connection portion 122 and the receiving groove C1 can be increased, thereby improving the connection stability between the flexible display panel 12 and the roll 11.

[0108] In one alternative embodiment, the second curved surface b21 of the second curved groove B2 is connected to the outer wall D1 of the roller 11, and the end of the second curved surface b21 away from the first curved surface b11 is tangent to the outer wall D1. In this way, the flexible display panel 12 can be smoothly transitioned at the first opening k1 of the receiving groove C1.

[0109] Optionally, the flexible display panel 12 may include multiple film layers, which may include adhesive layers and functional layers. Since the strain of the adhesive layer is greater than that of the functional layer during the bending process of the flexible display panel 12, peeling may occur between adjacent adhesive layers and functional layers in related technologies. Simulation results show that, compared to the structure in related technologies that does not have a bent connecting portion 122 located in the receiving groove C1, in this embodiment, by setting the bending angle of the reverse bending portion 1225 to 180°, the strain of the adhesive layer at the junction of the bent connecting portion 122 and the rolled-up display portion 121 is reduced by 15% to 25%, and the strain of the functional layer is reduced by 11%. This improves the bonding effect of adjacent film layers at the junction of the bent connecting portion 122 and the rolled-up display portion 121, thereby preventing peeling between film layers and improving the reliability and yield of the flexible display module.

[0110] Referring to Figures 5 and 6, in an optional embodiment, the spool 11 may include a first shaft 111 and a second shaft 112 fixedly connected. In a first direction h1, the length of the first shaft 111 and the length of the second shaft 112 are both greater than the width of the bent connecting portion 122. The first direction is parallel to the axis of the spool 11. The first shaft 111 has a first shaft surface 1111 and a second shaft surface 1112 opposite each other along a second direction h2. The second shaft 112 has a third shaft surface 1121 and a fourth shaft surface 1122 opposite each other along the second direction h2. The second direction is perpendicular to the axis of the spool 11. The shapes of the second shaft surface 1112 and the third shaft surface 1121 may be complementary, and the second shaft surface 1112 is a first groove wall c11, the third shaft surface 1121 is a second groove wall c12, and the first shaft surface 1111 and the fourth shaft surface 1122 are joined to form the outer wall D1 of the spool 11. It should be noted that in Figures 5 and 6, the first direction h1 is perpendicular to the paper surface. It is understood that the complementary shapes of the second axial surface 1112 and the third axial surface 1121 in this embodiment refer to their complementarity within a certain tolerance range.

[0111] The first shaft 111 and the second shaft 112 can be bonded together, or they can be bolted together. For example, as shown in Figures 5 and 6, the receiving groove C1 located between the first shaft 111 and the second shaft 112 can have an S-shaped cross-section in the direction perpendicular to the axis of the scroll 11. If the bending connection portion 122 within the receiving groove C1 is bent too many times, the radius of curvature of some of the bending connection portion 122 will be too small, resulting in the strain of this portion of the bending connection portion 122 exceeding the maximum strain of the scroll display portion 121. In this embodiment, by designing the receiving groove C1 as S-shaped, that is, allowing the bending connection portion 122 within the receiving groove C1 to be bent twice, the problem of excessive strain in some of the bending connection portions 122 within the receiving groove C1 can be avoided.

[0112] In an alternative embodiment, as shown in Figures 5 and 6, the bent connecting portion 122 located in the receiving groove C1 is bonded to the first groove wall c11 and the second groove wall c12, respectively. During the manufacturing process of the display device 10, the display surface p1 of the bent connecting portion 122 of the flexible display panel 12 can be fixedly connected (e.g., bonded) to the second axial surface 1112 of the first shaft body 111 (i.e., the first groove wall c11), and then the third axial surface 1121 of the second shaft body 112 (i.e., the second groove wall c12) can be fixedly connected (e.g., bonded) to the back surface p2 of the bent connecting portion 122, and then the first shaft body 111 and the second shaft body 112 can be fixedly connected.

[0113] Please refer to Figures 14 and 15. Figure 14 is a structural schematic diagram of another display device 10 provided in an embodiment of this application. Figure 15 is a structural schematic diagram of the scroll 11 in the display device 10 shown in Figure 14. In an optional embodiment, the scroll 11 may include a first shaft 111 and a second shaft 112 fixedly connected. In a first direction, the length of the first shaft 111 and the length of the second shaft 112 are both greater than the width of the bent connecting portion 122. The first direction is a direction parallel to the axis of the scroll 11. The first shaft 111 may have an inner cavity 1113. The inner cavity 1113 may penetrate the first shaft 111 in the length direction of the first shaft 111. The length direction of the first shaft 111 is a direction parallel to the axis of the first shaft 111. The second shaft 112 can be located in the inner cavity 1113. The outer wall of the second shaft 112 is complementary in shape to the cavity wall of the inner cavity 1113, and the outer wall of the second shaft 112 is the first groove wall c11, while the cavity wall of the inner cavity 1113 is the second groove wall c12. The outer wall of the first shaft 111 is the outer wall D1 of the scroll 11. It should be noted that in Figures 14 and 15, the first direction h1 is perpendicular to the plane of the paper. It is understood that the complementary shape of the outer wall of the second shaft 112 and the cavity wall of the inner cavity 1113 in this embodiment refers to complementarity within a certain tolerance range.

[0114] The first shaft 111 and the second shaft 112 can be bonded together, or the first shaft 111 and the second shaft 112 can be bolted together. For example, the receiving groove C1 located between the first shaft 111 and the second shaft 112 can have a teardrop-shaped cross section in the direction perpendicular to the axis of the roll 11.

[0115] As shown in Figures 14 and 15, the bending angle range of the first curved surface b11 of the first curved groove B1 can be 240° to 300°. For example, the bending angle of the first curved surface b11 of the first curved groove B1 can be 240°, 245°, 255°, 260°, 270°, 285°, 290°, or 300°. The bending angle range of the first curved surface b11 of the first curved groove B1 can be 160° to 180°. For example, the bending angle of the second curved surface b21 of the second curved groove B2 can be 160°, 165°, 172°, 175°, or 180°. Since the first curved groove B1 is used to define the bending shape of the reverse bending portion 1225, the bending angle range of the reverse bending portion 1225 located in the first curved groove B1 can be 240° to 300°. According to the simulation results, compared with the structure in the related technology that does not have a bent connecting portion 122 located in the receiving groove C1, in this embodiment of the application, by setting the bending angle of the reverse bending portion 1225 to be 240° to 300°, the strain of the adhesive layer at the junction of the bent connecting portion 122 and the curled display portion 121 is reduced by 23% to 30%. For example, the strain of the adhesive layer at the junction of the bent connecting portion 122 and the curled display portion 121 is reduced by 27%.

[0116] During the manufacturing process of the display device 10, the flexible display panel 12 can be first fixedly connected (e.g., bonded) to the cavity wall of the inner cavity 1113 of the first shaft 111, and then the second shaft 112 can be inserted into the inner cavity 1113 of the first shaft 111, and the first shaft 111 and the second shaft 112 can be fixedly connected.

[0117] Please refer to Figures 16 and 17. Figure 16 is a schematic diagram of a flexible display panel 12 unfolded according to an embodiment of this application, and Figure 17 is a schematic diagram of the structure of the flexible display panel 12 shown in Figure 16 wound on a scroll 11. In an optional embodiment, the thickness of the rolled display portion 121 can be greater than or equal to the thickness of the bent connecting portion 122. That is, the flexible display panel 12 can include multiple film layers. One end of each of the multiple film layers of the flexible display panel 12 can be placed in the receiving groove C1 for reverse bending, or one end of at least one film layer of the flexible display panel 12 can be placed in the receiving groove C1 for reverse bending.

[0118] The flexible display panel 12 may include multiple film layers, including adhesive layers and functional layers. Adjacent functional layers can be bonded together by adhesive layers. Since the strain of the adhesive layer is greater than that of the functional layer during the bending process of the flexible display panel 12, only the film layers adjacent to the adhesive layer with higher strain can be bent in the opposite direction in the receiving groove C1.

[0119] Referring to Figures 16 and 17, in an optional embodiment, the rollable display portion 121 may include a cover layer 1211, a polarizer layer 1212, a touch display layer 1213, a back film layer 1214, and a support layer 1215 stacked sequentially; the curved connection portion 122 may include a first structural layer 1221, a second structural layer 1222, and a third structural layer 1223, wherein the first structural layer 1221 and the polarizer layer 1212 are integrally formed, the second structural layer 1222 and the touch display layer 1213 are integrally formed, and the third structural layer 1223 and the back film layer 1214 are integrally formed.

[0120] For example, if there is a risk of failure in the adhesive layer between the polarizing layer 1212 and the touch display layer 1213 in the flexible display panel 12, the polarizing layer 1212, the touch display layer 1213, and the adhesive layer between them can be extended. This allows the adhesive layer between the polarizing layer 1212 and the touch display layer 1213 to be located in the intermediate layer during bending (the intermediate layer experiences less tensile or compressive force during bending), thereby reducing the strain of the adhesive layer between the polarizing layer 1212 and the touch display layer 1213. Using the extended portion of the polarizing layer 1212 and the extended portion of the touch display layer 1213, as well as the adhesive layer between them, as the bending connection portion 122, can also be used. Alternatively, the back film layer 1214 can be extended based on the extended polarizing layer and the touch display layer 1213, and the back film layer 1214 can improve the overall strength of the bending connection portion 122. If there is a risk of failure in the adhesive layer between the cover layer 1211 and the polarizing layer 1212, the cover layer 1211, the polarizing layer 1212, and the adhesive layer between them can be extended. The extended portion of the cover layer 1211, the extended portion of the polarizing layer 1212, and the adhesive layer between them can be used as a bent connection 122. The material of the adhesive layer between the cover layer 1211 and the polarizing layer 1212 may include optically clear adhesive (OCA), and the material of the cover layer 1211 may include polyethylene glycol terephthalate (PET).

[0121] Please refer to Figures 18 and 19. Figure 18 is a schematic diagram of the simulation result of a flexible display panel 12 in the related art, and Figure 19 is a schematic diagram of the simulation result of a flexible display panel 12 provided in the embodiment of this application. The simulation result of the flexible display panel 12 shown in Figure 18 can be the simulation result diagram of the flexible display panel 12 in the display device 10 shown in Figure 2. As can be seen from Figure 18, one end of the flexible display panel 22 has a fixing part 221, which can be directly fixedly bonded to the outer wall of the roller 21. The position σ of the maximum strain value of the flexible display panel 22 is at the junction of the fixing part 221 and the rolled display part 222. As shown in Figure 19, after the curved connecting portion 122 of the flexible display panel 12 is placed in the receiving groove C1, since the bending direction of the portion of the curved connecting portion 122 located in the receiving groove C1 is opposite to the bending direction of the rolled display portion 121, the misalignment direction of the film layer in the portion of the curved connecting portion 122 is opposite to the misalignment direction of the multiple film layers in the rolled display portion 121. This reduces the film layer strain of the flexible display panel 12 during rolling and improves the quality of the flexible display panel 12. Furthermore, the position σ of the maximum strain value of the flexible display panel 12 is shifted from the junction of the fixed portion 221 and the rolled display portion 222 to the junction of the rolled display portion 121 and the flat display portion 124. Combined with the above description, the maximum strain value σ can also be reduced. For example, as shown in FIG17, the polarizing layer 1212, the touch display layer 1213, and the back film layer 1214 are extended and bent and reverse-bent within the receiving groove C1 of the roll 11. Compared with the maximum strain value in related technologies, the maximum strain value of the adhesive layer between the polarizing layer 1212 and the touch display layer 1213 in this embodiment is reduced by 10% to 20%. At the same time, the strain of the touch display layer 1213 can also be reduced by 6% to 10%, and for example, the strain reduction of the touch display layer 1213 is 8%. In this way, the strain of the flexible display panel 12 when bent can be reduced, the bending resistance of the flexible display panel 12 can be improved, and the bending radius of the rolled display portion 121 of the flexible display panel 12 (i.e., the radius of the roll 11) can be reduced, so as to improve the display effect of the display device 10 while realizing the miniaturization of the display device 10.

[0122] Please refer to Figure 20, which is a schematic diagram of another display device 10 provided in an embodiment of this application. In an optional embodiment, the flexible display panel 12 may further include an extension fixing portion 123 extending from the edge of the curved connecting portion 122 away from the rolled display portion 121; the receiving groove C1 may also have a second opening k2 opposite to the first opening k1. At least a portion of the extension fixing portion 123 may be located outside the receiving groove C1 via the second opening k2 and fixedly connected to the outer wall D1 of the roller 11. For example, the extension fixing portion 123 may be bonded to the outer wall D1 of the roller 11. Thus, the curved connecting portion 122 located in the receiving groove C1 may not be bonded to the first groove wall c11 and the second groove wall c12 of the receiving groove C1, and the bending direction of the curved connecting portion 122 located in the receiving groove C1 is defined only by the first groove wall c11 and the second groove wall c12 of the receiving groove C1. The connection method of fixing the flexible display panel 12 and the scroll 11 outside the shaft by extending the fixing part 123 can reduce the manufacturing difficulty of the display device 10 compared with the connection method of fixing inside the shaft.

[0123] The extension fixing part 123 can extend from the second edge of the curved connecting part 122. The second edge can be parallel to the length direction of the second opening k2, and the second edge of the curved connecting part 122 can be parallel to the first edge of the curled display part 121. The length direction of the second opening k2 can be parallel to the axis of the scroll 11.

[0124] In one alternative embodiment, the thickness of the bent connection portion 122 is greater than or equal to the thickness of the extension fixing portion 123. That is, multiple film layers of the bent connection portion 122 can be extended to the outside of the second opening k2 to form the extension fixing portion 123, or at least one film layer of the bent connection portion 122 can be extended to the outside of the second opening k2 to form the extension fixing portion 123.

[0125] Please refer to Figures 21 and 22. Figure 21 is a structural schematic diagram of another display device 10 provided in an embodiment of this application, and Figure 22 is an unfolded schematic diagram of the flexible display panel 12 in the display device 10 shown in Figure 21. In an optional embodiment, the rollable display portion 121 may include a cover plate layer 1211, a polarizing layer 1212, a touch display layer 1213, a back film layer 1214, and a support layer 1215 stacked sequentially; the bent connection portion 122 includes a first structural layer 1221, a second structural layer 1222, and a third structural layer 1223. The first structural layer 1221 and the polarizing layer 1212 are integrally formed, the second structural layer 1222 and the touch display layer 1213 are integrally formed, and the third structural layer 1223 and the back film layer 1214 are integrally formed; the extension fixing portion 123 includes a fourth structural layer 1231, which is at least integrally formed with the third structural layer 1223. That is, the extension fixing part 123 can be a single-layer film structure, and the extension fixing part 123 can be integrated with the back film layer 1214. The material of the back film layer 1214 can include polyethylene terephthalate or polyimide (PI). In this way, by setting the fixing extension part in a single-layer structure, the influence of the fixing extension part attached to the outer wall D1 of the spool 11 on the curled display part 121 wound on the spool 11 can be reduced.

[0126] Of course, in optional embodiments, the extension fixing part 123 may also be a multilayer film structure. For example, the extension fixing part 123 may include a stacked fourth structural layer, a fifth structural layer and a sixth structural layer. The fourth structural layer and the third structural layer are an integral structure, the fifth structural layer and the second structural layer are an integral structure, and the sixth structural layer and the first structural layer are an integral structure. The number of film layers in the extension fixing part 123 is not limited in the embodiments of this application.

[0127] In one optional embodiment, the bending angle of the extension fixing part 123 can be in the range of 40° to 50°. For example, the bending angle of the extension fixing part 123 can be 40°, 42°, 45°, 48° or 50°. Within this range, it is possible to avoid the extension fixing part 123 being too small, which would affect the fixing effect between the flexible display panel 12 and the roller 11, and it is also possible to avoid the extension fixing part 123 being too large, which would affect the rollable display part 121.

[0128] Please refer to Figure 23, which is a schematic diagram of another display device 10 provided in an embodiment of this application. In an optional embodiment, the outer wall of the scroll 11 may have a first step 113, and one end of the bent connecting part 122 extends out of the first opening k1 and connects with the rolled display part 121. The first step 113 includes a first platform 1131, a first bottom surface 1132 and a first side surface 1133 connecting the first platform 1131 and the first bottom surface 1132. When the display device 10 is in a retracted state, the bent connecting part 122 may be located on the first platform 1131 and the rolled display part 121 may be located on the first bottom surface 1132.

[0129] Please refer to Figures 23 and 24. Figure 24 is a schematic diagram of another display device 20. When the thicknesses of the curved connecting portion 122 and the rolled display portion 121 are different, there is a step difference at their junction. This step difference can lead to stress concentration at the junction of the curved connecting portion 122 and the rolled display portion 121. In this embodiment, by providing a first step 113 that matches the step difference between the curved connecting portion 122 and the rolled display portion 121, stress concentration at the junction of the curved connecting portion 122 and the rolled display portion 121 can be avoided when the display device 10 is in a retracted state. In the direction perpendicular to the axis of the scroll 11, the arc length L1 of the cross-section of the first platform 1131 of the first step 113 is equal to the arc length L2 of the cross-section of the portion of the curved connecting portion 122 extending out of the first opening k1 of the receiving groove C1. It should be noted that the arc length L1 of the cross section of the first platform 1131 of the first step 113 in this embodiment is equal to the arc length L2 of the cross section of the portion of the bent connection 122 extending out of the first opening k1 of the receiving groove C1, which means that they are equal within a certain tolerance range.

[0130] In an alternative embodiment, the height of the first step 113 is the same as the thickness of the support layer 1215. By filling the first step 113 with the end of the support layer 1215, no height difference is formed between the back surface p2 of the flexible display panel 12 and the outer wall D1 of the roller 11. This avoids stress concentration at the junction of the bent connection 122 and the rolled display portion 121 when the flexible display panel 12 is wound onto the roller 11, thereby reducing damage to the flexible display panel 12.

[0131] In an optional embodiment, the display device 10 may further include a driving component, which may be connected to the housing and configured to drive the scroll 11 to rotate relative to the housing. In this case, by providing a driving component in the display device 10, the driving component can drive the scroll 11 to rotate, effectively improving the user experience. In this application, the display device 10 may further include a control component (not shown in the figure), which is connected to the driving component, and the user can control the driving component to drive the scroll 11 to rotate through the control component.

[0132] Furthermore, the display device 10 in this application embodiment can be any product or component with display and scrolling functions, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0133] In summary, this application provides a display device comprising a scroll and a flexible display panel. When the scroll in the display device rotates, it can cause the curled display portion of the flexible display panel to wind around the scroll, thereby reducing the size of the area of ​​the flexible display panel used for displaying the image, making it easier to carry. Furthermore, by bending a portion of the curved connecting part in the receiving groove in the opposite direction to the curled display portion wound on the scroll, the curved connecting part can reduce the bending stress of the curled display portion, thereby reducing the strain of the curled display portion during winding, lowering the probability of failure of the flexible display panel, and improving the display effect of the flexible display panel after repeated winding.

[0134] In this application, the term "at least one of A and B" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "at least one of A and B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0135] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0136] In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.

[0137] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display device, characterized by comprising: The application relates to a flexible display device, comprising: a reel having a receiving groove with a first opening; a flexible display panel having opposite display and back surfaces, the flexible display panel comprising a coiled display part capable of being coiled on the reel and a curved connecting part extending from an edge of the coiled display part, at least part of the curved connecting part being located in the receiving groove via the first opening and being connected with the reel; the receiving groove is configured to limit the bending direction of the curved connecting part located in the receiving groove, the protruding direction of the part of the curved connecting part located in the receiving groove being a first protruding direction, the protruding direction of the coiled display part coiled on the reel being a second protruding direction, one of the first and second protruding directions being the direction in which the display surface is close to the back surface and the other being the direction in which the display surface is away from the back surface.

2. The display device according to claim 1, wherein the receiving groove has opposite first and second groove walls, the display surface of at least part of the curved connecting part being in contact with the first groove wall and the back surface of at least part of the curved connecting part being in contact with the second groove wall; alternatively, the back surface of at least part of the curved connecting part is in contact with the first groove wall and the display surface of at least part of the curved connecting part is in contact with the second groove wall.

3. The display device according to claim 1, wherein the receiving groove comprises a first curved groove and a second curved groove, the first end of the second curved groove being in communication with the first curved groove and the second end of the second curved groove being in communication with the first opening, the first curved groove having opposite two first curved surfaces and the second curved groove having opposite two second curved surfaces; the protruding direction of the curved connecting part located in the second curved groove is the second protruding direction; the protruding direction of the curved connecting part located in the first curved groove is the first protruding direction.

4. The display device according to claim 3, wherein the reel has an outer shaft wall, the first curved surface, the second curved surface and the outer shaft wall satisfying the following relationship: R3<=R2 wherein R1 is the first curvature radius of the outer shaft wall, R2 is the second curvature radius of the second curved surface and R3 is the third curvature radius of the first curved surface.

5. The display device according to claim 3, wherein the receiving groove further comprises a strip-shaped groove, two ends of the strip-shaped groove being in communication with the first curved groove and the second curved groove respectively; the strip-shaped groove has opposite two strip-shaped surfaces, two ends of the strip-shaped surfaces being tangent to the first curved surface and the second curved surface respectively.

6. The display device according to claim 3, wherein the first curved surface and the second curved surface are tangent to each other.

7. The display device according to claim 6, wherein the second curved surface of the second curved groove is connected with the outer shaft wall of the reel, and the end of the second curved surface away from the first curved surface is tangent to the outer shaft wall.

8. The display device according to claim 2, wherein the reel comprises fixedly connected first and second shaft bodies, in a first direction, the length of the first shaft body and the length of the second shaft body are both greater than the width of the curved connecting part, the first direction being the direction parallel to the axis of the reel. The first shaft body has a first shaft surface and a second shaft surface opposite in a second direction, and the second shaft body has a third shaft surface and a fourth shaft surface opposite in the second direction, the second direction being perpendicular to the axis of the reel; The second shaft surface and the third shaft surface are complementary in shape, the second shaft surface is the first groove wall, the third shaft surface is the second groove wall, and the first shaft surface and the fourth shaft surface are spliced into the outer wall of the reel.

9. The display device according to claim 2, wherein The reel comprises a first shaft body and a second shaft body fixedly connected, and the length of the first shaft body and the length of the second shaft body are both greater than the width of the curved connecting part in a first direction, the first direction being parallel to the axis of the reel. The first shaft body has an inner cavity, and the second shaft body is located in the inner cavity, the outer wall of the second shaft body being complementary in shape to the cavity wall of the inner cavity, and the outer wall of the second shaft body being the first groove wall and the cavity wall of the inner cavity being the second groove wall, and the outer wall of the first shaft body being the outer wall of the reel.

10. The display device according to claim 2, wherein The curved connecting part is connected to the end of the accommodating groove away from the first opening.

11. The display device according to claim 2, wherein The curved connecting part in the accommodating groove is bonded to the first groove wall and the second groove wall, respectively.

12. The display device according to claim 1, wherein The thickness of the curved display part is greater than or equal to the thickness of the curved connecting part.

13. The display device of claim 12, wherein, The curved display part comprises a cover plate layer, a polarizing layer, a touch display layer, a back film layer and a support layer which are stacked in sequence; The curved connecting part comprises a first structure layer, a second structure layer and a third structure layer, the first structure layer and the polarizing layer being an integral structure, the second structure layer and the touch display layer being an integral structure, and the third structure layer and the back film layer being an integral structure.

14. The display device of claim 1, wherein The flexible display panel further comprises an extension fixing part extending from the edge of the curved connecting part away from the curved display part; The accommodating groove further has a second opening opposite to the first opening, at least part of the extension fixing part being located outside the accommodating groove through the second opening and being fixedly connected to the outer wall of the reel.

15. The display device of claim 14, wherein, The thickness of the curved connecting part is greater than or equal to the thickness of the extension fixing part.

16. The display device according to claim 14, characterized in that, The curved display part comprises a cover plate layer, a polarizing layer, a touch display layer, a back film layer and a support layer which are stacked in sequence; The curved connecting part comprises a first structure layer, a second structure layer and a third structure layer, the first structure layer and the polarizing layer being an integral structure, the second structure layer and the touch display layer being an integral structure, and the third structure layer and the back film layer being an integral structure; The extension fixing part comprises a fourth structure layer, the fourth structure layer being an integral structure with at least the third structure layer.

17. The display device of claim 14, wherein, The bending angle range of the extension fixing part is 40°-50°.

18. The display device of claim 13, wherein, The outer wall of the reel has a first step, and one end of the curved connecting part extends out of the first opening and is connected to the curved display part. The first step comprises a first platform, a first bottom surface and a first side surface connecting the first platform and the first bottom surface, the curved connecting part being located on the first platform, and the curved display part being located on the first bottom surface.

19. The display device of claim 18, wherein, The height of the first step is consistent with the thickness of the support layer.

20. The display device according to claim 3, wherein The curved connecting part comprises a forward curved part and a reverse curved part connected away from the curl display part, the forward curved part is located in the second curved groove, and the reverse curved part is located in the first curved groove; The forward curved part is respectively matched with two second curved surfaces of the second curved groove, and the reverse curved part is respectively matched with the first curved surface of the first curved groove; The bending angle range of the forward curved part is 70°-100°, and the bending angle range of the reverse curved part is 70°-100°.

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