Rollable display panel and rollable display device

Abstract

The present application provides a rollable display panel and a rollable display device, relating to the technical field of displays, and is used to solve the technical problem of the low service life of the rollable display panel. Among them, the rollable display panel has a display area and a non-display area; the rollable display panel includes: a flexible screen body, and the flexible screen body includes a flexible screen main body, dams and protrusions; the dams and the protrusions are both arranged on one surface of the flexible screen main body close to the light-emitting side, the dams and the protrusions are both located in the non-display area, and the protrusions are located on the side of the dams away from the display area; an encapsulation layer, and the encapsulation layer covers the flexible screen main body, the dams and the protrusions.

Description

Technical Field

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

[0002] With the development of flexible display technologies, Organic Light Emitting Diode (OLED) has shown great potential in flexible displays. The OLED flexible display module has the characteristics of large size and portability, and its application scope includes fixed flexible display modules and foldable display modules.

[0003] In related technologies, in order to meet the requirements of convenient storage and portability of the display module in the non-use state, rollable display panels have attracted more and more attention. When the rollable display panel is in the non-use state, the rollable display panel can be wound up one by one, and the rollable display panel is wound on the reel in a multi-layer winding manner. When the rollable display panel is in the use state, the rollable display panel can be released, and the flattened rollable display panel after release can provide a large display area for users.

[0004] However, the service life of the rollable display panel in the above solution is relatively low. Summary of the Invention

[0005] In view of the above problems, embodiments of the present application provide a rollable display panel and a rollable display device, which are used to overcome the problem of relatively low service life of the rollable display panel.

[0006] To achieve the above object, embodiments of the present application provide the following technical solutions:

[0007] A first aspect of embodiments of the present application provides a rollable display panel, which has a display area and a non-display area; the rollable display panel includes: a flexible screen body, the flexible screen body includes a flexible screen main body, dams and protrusions; both the dams and the protrusions are disposed on a surface of the flexible screen main body close to the light-emitting side, both the dams and the protrusions are located in the non-display area, and the protrusions are located on a side of the dams away from the display area; an encapsulation layer, the encapsulation layer covers the flexible screen main body, the dams and the protrusions.

[0008] In a possible implementation manner, at least two circles of protrusions are disposed around the display area. In this way, the surface area of the flexible screen body located in the non-display area can be further increased, and the bonding area between the flexible screen body and the encapsulation layer can be increased.

[0009] In a possible implementation, at least one loop of the protrusions is a ring structure. In this way, it can not only increase the area of the surface of the flexible screen body near the light-emitting side, but also make the preparation process of the flexible screen body relatively simple.

[0010] In a possible implementation, at least one loop of the protrusions includes a plurality of block structures, and at least part of the block structures are distributed at intervals along the circumferential direction of the dike. In this way, it can make the surface of the flexible screen body near the light-emitting side have a larger area, so that the flexible screen body and the encapsulation layer have a larger bonding area.

[0011] In a possible implementation, at least two loops of the protrusions are distributed at intervals in a direction away from the display area.

[0012] In a possible implementation, along the direction close to the light-emitting side, the cross-sectional area of the protrusion perpendicular to the thickness direction of the rollable display panel gradually decreases. In this way, the protrusion can have a larger surface area, the surface of the flexible screen body near the light-emitting side can have a larger area, so that the flexible screen body and the encapsulation layer have a larger bonding area.

[0013] In a possible implementation, the dike includes an inner dike and an outer dike that are distributed at intervals, and the outer dike is located on the side of the inner dike away from the display area. In this way, the barrier effect of the dike on water and oxygen can be improved.

[0014] In a possible implementation, at least part of the protrusions are located on the side of the outer dike away from the display area.

[0015] In a possible implementation, at least part of the protrusions are located between the inner dike and the outer dike. This provides multiple possibilities for the position of the protrusions.

[0016] In a possible implementation, the distance between the surface of the encapsulation layer covering the protrusion near the light-emitting side and the surface of the flexible screen body near the light-emitting side is less than or equal to the distance between the surface of the encapsulation layer in the display area near the light-emitting side and the surface of the flexible screen body near the light-emitting side. In this way, it can be avoided that the set protrusions increase the thickness of the rollable display panel.

[0017] In a possible implementation, the encapsulation layer in the non-display area is also provided with bonding holes, the bonding holes extend in a direction away from the light-emitting side, the bonding holes penetrate through the encapsulation layer, and bonding members are arranged in the bonding holes. In this way, on the one hand, the bonding members can be bonded to the encapsulation layer, and on the other hand, they can also be bonded to the flexible screen body, so as to improve the connection reliability between the encapsulation layer and the flexible screen body.

[0018] In a possible implementation, the axial direction of the bonding hole is parallel to the thickness direction of the rollable display panel. In this way, the difficulty of preparing the bonding hole can be reduced, and the preparation efficiency of the rollable display panel can be improved.

[0019] In a possible implementation, the bonding hole extends into the flexible screen body. In this way, the bonding member filled in the bonding hole can have a large bonding area with the flexible screen body, the bonding force between the bonding member and the flexible screen body can be increased, and thus the connection reliability between the encapsulation layer and the flexible screen body can be improved.

[0020] In a possible implementation, the orthographic projection of the bonding hole on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection of the area between two adjacent protrusions on the surface of the flexible screen body close to the light-emitting side. In this way, not only the connection reliability between the protrusion and the encapsulation layer can be ensured, but also the hole wall of the bonding hole has a large area, so that there is a large bonding area between the bonding member and the encapsulation layer, and thus the contact area between the bonding member and the encapsulation layer can be increased.

[0021] In a possible implementation, the orthographic projection of the bonding hole on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection of the area between the protrusion and the dam adjacent to it on the surface of the flexible screen body close to the light-emitting side. In this way, not only the connection reliability between the protrusion and the encapsulation layer can be ensured, but also the hole wall of the bonding hole has a large area, so that there is a large bonding area between the bonding member and the encapsulation layer, and thus the contact area between the bonding member and the encapsulation layer can be increased.

[0022] In a possible implementation, along the direction away from the light-emitting side, the aperture of the bonding hole gradually decreases. In this way, the hole wall of the bonding hole has a large area, so that the bonding member filled in the bonding hole can have a large bonding area with the encapsulation layer and the flexible screen body

[0023] In a possible implementation, the material of the bonding member includes inorganic glue. In this way, the bonding force between the bonding member and the encapsulation layer can be increased, and thus the connection reliability between the encapsulation layer and the flexible screen body can be improved.

[0024] In a possible implementation, the dam is an annular structure extending along the circumferential direction of the display area to improve the effect of blocking water and oxygen.

[0025] In a possible implementation, the bonding hole is arranged to extend along the circumferential direction of the dam. In this way, the preparation process of the rollable display panel can be simplified.

[0026] In a possible implementation, there are multiple bonding holes, and at least some of the bonding holes are distributed at intervals along the circumferential direction of the dam. In this way, the contact area between the bonding member and the encapsulation layer and the flexible screen body can be increased, thereby improving the connection reliability between the encapsulation layer and the flexible screen body.

[0027] In a possible implementation, at least a part of the encapsulation layer located in the non-display area is recessed towards the flexible screen body to form a groove, and the groove communicates with the bonding hole, and the bonding member is arranged in the groove. In this way, the bonding member can have a larger contact area with the encapsulation layer, the adhesive force between the bonding member and the encapsulation layer can be increased, and the bonding member is also bonded to the flexible screen body, thereby increasing the connection reliability between the encapsulation layer and the flexible screen body.

[0028] In a possible implementation, the orthographic projection of the groove on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection of the area between two adjacent protrusions on the surface of the flexible screen body close to the light-emitting side. In this way, the groove wall can have a larger area, and more bonding members can be filled in the groove, thereby increasing the contact area between the bonding member and the encapsulation layer.

[0029] In a possible implementation, the orthographic projection of the groove on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection of the area between the protrusion and the adjacent dam on the surface of the flexible screen body close to the light-emitting side. In this way, the groove wall can have a larger area, and more bonding members can be filled in the groove, thereby increasing the contact area between the bonding member and the encapsulation layer.

[0030] In a possible implementation, the orifice of the bonding hole is located on the bottom wall of the groove away from the light-emitting side, and there is a preset distance between the edge of the orifice of the bonding hole and the edge of the bottom wall. In this way, the bonding member can have a larger contact area with the encapsulation layer, and the adhesive force between the bonding member and the encapsulation layer can be increased.

[0031] The second aspect of the embodiments of the present application provides a rollable display device, including: a reel and the rollable display panel as described in any one of the foregoing items, and the rollable display panel is connected to the reel. Among them, the technical effects of the embodiments of the present application are the same as those of the foregoing embodiments, and will not be elaborated here.

[0032] The present application provides a rollable display panel and a rollable display device. Among them, by providing a protrusion on the surface of the flexible screen body near the light-emitting side and in the non-display area, and arranging the protrusion on the side of the dam on the surface of the flexible screen body away from the display area, the part of the flexible screen body located in the non-display area can have a larger surface area. In this way, when preparing the encapsulation layer, the flexible screen body and the encapsulation layer can have a larger bonding area, the bonding force between the flexible screen body and the encapsulation layer increases, the connection reliability between the encapsulation layer and the flexible screen body can be improved, thereby the problem that the encapsulation layer is peeled off from the flexible screen body when the rollable display panel is curled can be alleviated or even avoided, and further the service life of the rollable display panel can be prolonged. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Schematic diagram of a rollable display panel in a curled state provided by an embodiment of the present application;

[0035] Figure 2 Schematic diagram of a rollable display panel in a flattened state provided by an embodiment of the present application;

[0036] Figure 3 Schematic diagram of the structure of a flexible screen body provided by an embodiment of the present application;

[0037] Figure 4 Schematic diagram of the structure of a rollable display panel provided by an embodiment of the present application;

[0038] Figure 5 Partial schematic diagram of the part with protrusions of a rollable display panel provided by an embodiment of the present application;

[0039] Figure 6 Schematic diagram of the structure of a rollable display panel when the protrusion is a ring structure provided by an embodiment of the present application;

[0040] Figure 7 Schematic diagram of the structure of a rollable display panel when the protrusion is a block structure provided by an embodiment of the present application;

[0041] Figure 8 Schematic diagram of the structure of a flexible screen body provided by another embodiment of the present application;

[0042] Figure 9Partial schematic view of a rollable display panel provided by an embodiment of the present application when the non-display area has an adhesive hole;

[0043] Figure 10 Partial schematic view of a rollable display panel provided by another embodiment of the present application when the non-display area has an adhesive hole;

[0044] Figure 11 Partial schematic view of a rollable display panel provided by still another embodiment of the present application when the non-display area has an adhesive hole;

[0045] Figure 12 Partial schematic view of a rollable display panel provided by yet another embodiment of the present application when the non-display area has an adhesive hole.

[0046] Explanation of reference numerals:

[0047] 1. Rollable display panel; 1a. Display area; 1b. Non-display area; 11. Flexible screen body; 111. Flexible screen body; 112. Dam; 1121. Inner dam; 1122. Outer dam; 113. Protrusion; 1131. Ring structure; 1132. Block structure; 12. Encapsulation layer; 121. First inorganic encapsulation layer; 122. Organic encapsulation layer; 123. Second inorganic encapsulation layer; 14. Adhesive hole; 15. Adhesive; 16. Groove; 161. Bottom wall; 2. Reel; Z. Thickness direction of the rollable display panel. Detailed implementation manners

[0048] As in the background art, for the problem of the low service life of the rollable display panel in the related art, the applicant has found through research that the reason for this problem is that during the curling process, affected by the stress of the rollable display panel, especially the stress of the encapsulation layer, the contact pulling force between the part of the encapsulation layer near the edge and the adjacent film layer is small, resulting in the risk of peeling of the encapsulation layer when the rollable display panel is curled, and thus the service life of the rollable display panel is low.

[0049] In view of the above technical problems, the embodiment of the present application provides a rollable display panel. By providing a protrusion on the surface of the flexible screen body of the flexible screen body near the light-emitting side, the protrusion is arranged on the side of the dam in the non-display area away from the display area, and the encapsulation layer covers the surfaces of the flexible screen body, the dam and the protrusion. In this way, the bonding area between the encapsulation layer and the flexible screen body can be increased, and the bonding force between the encapsulation layer and the flexible screen body can be increased, so as to reduce or even avoid the problem of peeling of the encapsulation layer when the rollable display panel is curled, and thus the service life of the rollable display panel can be extended.

[0050] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0051] Please refer to Figures 1 to 3 , the embodiment of the present application provides a rollable display panel 1, and the rollable display panel 1 can be rolled up on a reel 2. Among them, for the convenience of description, the arrow Z in the accompanying drawings is used to indicate the thickness direction of the rollable display panel 1 and also used to indicate the light-emitting direction of the rollable display panel 1. The rolling direction of the rollable display panel 1 is Figure 1 the circumferential direction of the rollable display panel 1 in the rolled-up state in Figure 2 , and the rolling direction is generally the length direction of the rollable display panel 1, that is, Figure 2 the up-and-down direction in

[0052] Of course, in other embodiments, the rolling direction of the rollable display panel 1 can also be the width direction of the rollable display panel 1, that is,

[0053] The rollable display panel 1 can have a display area 1a and a non-display area 1b. In some examples, the non-display area 1b can be located on the periphery of the display area 1a. For the convenience of description, this embodiment will take this as an example for illustration. In other examples, the non-display area 1b can be arranged near some edges of the display area 1a; or, the display area 1a is located on the periphery of the non-display area 1b. The rollable display panel 1 located in the display area 1a can be used for emitting light or displaying images. The non-display area 1b of the rollable display panel 1 can be used for arranging wiring so that the rollable display panel 1 can be electrically connected to an external device.

[0054] Please continue to refer to Figure 2 and Figure 3, the flexible screen body 11 may include a flexible screen main body 111, a dam 112 and a protrusion 113. Among them, the flexible screen main body 111 may include a flexible substrate, a driving array layer and an organic electroluminescent component layer which are stacked. In the flexible screen main body 111 located in the display area 1a, the driving array layer includes thin film transistors for driving the organic electroluminescent component layer. The thin film transistors provide electrical signals for the organic electroluminescent component layer. When an electrical signal is written into the organic electroluminescent component layer, the organic electroluminescent component layer will emit light. The side where the organic electroluminescent component layer emits light, that is, the side away from the flexible substrate, is the light-emitting side. In the flexible screen main body 111 located in the non-display area 1b, various lines such as power supply traces, clock traces, and gate driving circuits and source driving circuits for connecting thin film transistors are provided to ensure the normal operation of the rollable display panel 1.

[0055] The dam 112 is located on one surface of the flexible screen main body 111 close to the light-emitting side and extends in a direction away from the flexible screen main body 111. The dam 112 may be located in the non-display area 1b and is used to block water and oxygen.

[0056] A protrusion 113 may be provided on the side of the dam 112 away from the display area 1a. The protrusion 113 may be located on one surface of the flexible screen main body 111 close to the light-emitting side and extends in a direction away from the flexible screen main body 111. In this way, by providing the protrusion 113 on the periphery of the dam 112, the area of the surface of the flexible screen body 11 close to the light-emitting side can be increased.

[0057] Among them, when the rollable display panel 1 is in a flattened state, the dam 112 and the protrusion 113 are located on the plane of the flexible screen main body 111 close to the light-emitting side.

[0058] Among them, the protrusion 113 may be made of an organic material so that the protrusion 113 can play a role in blocking water and oxygen; the material used for the protrusion 113 may be the same as or different from the material used for the dam 112. The protrusion 113 and the dam 112 may be formed by grooving the inorganic film layer in the flexible screen main body 111 located in the non-display area 1b; alternatively, the protrusion 113 may be formed on the surface of the flexible screen main body 111 close to the light-emitting side by means of deposition or the like.

[0059] Generally speaking, the dam 112 may be a ring structure. For the convenience of description, this embodiment will take this as an example for illustration. Of course, in other examples, the dam 112 may also be a strip structure or a structure of other shapes.

[0060] In some examples, a raised portion 113 may be provided around the periphery of the dam 112, that is, a raised portion 113 is provided around the display area 1a, so as to simplify the manufacturing process of the rollable display panel 1. In other examples, at least two raised portions 113 may be provided around the periphery of the dam 112, that is, around the display area 1a, and the at least two raised portions 113 are spaced apart in a direction away from the display area 1a. In this way, the surface of the flexible screen body 11 close to the light-emitting side can have a larger area.

[0061] Preferably, the cross-section of the raised portion 113 along the thickness direction Z parallel to the rollable display panel 1 may be generally trapezoidal or other polygons, and the vertices of the polygon may be rounded. Alternatively, the cross-section of the raised portion 113 along the thickness direction Z parallel to the rollable display panel 1 may include an arc, such as being generally semi-circular or semi-oval.

[0062] Please refer to Figure 4 and Figure 5 , the encapsulation layer 12 may cover the surface of the flexible screen body 11 close to the light-emitting side. Specifically, the encapsulation layer 12 may cover the surface of the flexible screen body 111 located in the display area 1a, the surface of the dam 112, the surface of the raised portion 113, and the surface of the flexible screen body 111 located in the non-display area 1b. In this way, the surface of the flexible screen body 11 close to the light-emitting side has a larger area, the encapsulation layer 12 and the flexible screen body 11 can have a larger bonding area, and the encapsulation layer 12 and the flexible screen body 11 have a greater bonding force, so as to reduce or even avoid the problem of peeling of the encapsulation layer 12 when the rollable display panel 1 is curled.

[0063] Exemplarily, the encapsulation layer 12 includes a first inorganic encapsulation layer 121, an organic encapsulation layer 122, and a second inorganic encapsulation layer 123. Among them, the first inorganic encapsulation layer 121 covers the flexible screen body 111, and also covers the dam 112, the raised portion 113, the area between the dam 112 and the raised portion 113 of the flexible screen body 111, and the area between two adjacent raised portions 113. The organic encapsulation layer 122 may be formed on the surface of the first inorganic encapsulation layer 121 close to the light-emitting side and located in the display area 1a by a deposition method such as inkjet printing (IJP). At this time, the dam 112 may be located around the organic encapsulation layer 122. In this way, on the one hand, the dam 112 can block external water oxygen, etc. from entering the display area 1a, and on the other hand, it can block the overflow of IJP ink. The second inorganic encapsulation layer 123 can cover the surface of the organic encapsulation layer 122 close to the light-emitting side, and can also cover the surface of the first inorganic encapsulation layer 121 close to the light-emitting side located in the non-display area 1b.

[0064] Exemplarily, a first inorganic encapsulation layer 121 can be formed on the surface of the flexible screen body 111 located in the display area 1a, the surface of the dam 112, the surface of the protrusion 113, and the surface of the flexible screen body 111 located in the non-display area 1b by means of deposition such as chemical vapor deposition (CVD). In this way, the first inorganic encapsulation layer 121 and the part of the flexible screen body 11 located in the non-display area 1b can have a larger contact area, which can improve the connection reliability between the first inorganic encapsulation layer 121 and the flexible screen body 11, thereby reducing or even avoiding the problem of peeling of the encapsulation layer 12 when the rollable display panel 1 is rolled. In addition, a second inorganic encapsulation layer 123 can also be formed on the surface of the organic encapsulation layer 122 and the surface of the first inorganic encapsulation layer 121 located in the non-display area 1b by means of deposition such as chemical vapor deposition.

[0065] In the rollable display panel 1 provided in this embodiment, by providing a protrusion 113 on the surface of the flexible screen body 111 near the light-emitting side and on the surface located in the non-display area 1b, and arranging the protrusion 113 on the side of the dam 112 on the surface of the flexible screen body 111 away from the display area 1a, the part of the flexible screen body 11 located in the non-display area 1b can have a larger surface area. In this way, when the encapsulation layer 12 is prepared, the flexible screen body 11 and the encapsulation layer 12 can have a larger bonding area, the bonding force between the flexible screen body 11 and the encapsulation layer 12 increases, the connection reliability between the encapsulation layer 12 and the flexible screen body 11 can be improved, thereby reducing or even avoiding the problem of peeling of the encapsulation layer 12 when the rollable display panel 1 is rolled, and further extending the service life of the rollable display panel 1.

[0066] Please refer to Figures 3 to 5 , in some embodiments, at least two circles of protrusions 113 can be provided around the display area 1a, and the at least two circles of protrusions 113 are spaced apart in a direction away from the display area 1a. Exemplarily, the number of circles of the protrusions 113 can be greater than or equal to 2 and less than or equal to 6. For example, the number of circles of the protrusions 113 can be 2, 3, 4, 5, or 6 circles. In this way, not only can the area of the surface of the flexible screen body 11 near the light-emitting side be increased, but also the preparation process of the flexible screen body 11 can be relatively simplified. Of course, the number of circles of the protrusions 113 is not limited to this. Here in this embodiment, it is only an example for illustration, and specifically can be set according to actual needs.

[0067] Of course, in other embodiments, one circle of protrusions 113 can also be provided around the display area 1a to simplify the preparation process of the flexible screen body 11.

[0068] For the convenience of description, hereinafter, the case where at least two circles of protrusions 113 are provided around the display area 1a will be taken as an example for illustration. The implementation process when one circle of protrusions 113 is provided around the display area 1a is similar thereto.

[0069] Please refer to Figure 6In some examples, the protrusion 113 may be an annular structure 1131, and specifically, the annular structure 1131 is closed. The annular structure 1131 of the protrusion 113 may be adapted to the annular structure of the dam 112; for example, when the annular structure of the dam 112 is roughly a rounded rectangle, the annular structure 1131 of the protrusion 113 is also roughly a rounded rectangle. Of course, when it is necessary to avoid other structures of the rollable display panel 1, a notch may be provided at the corresponding position of the protrusion 113.

[0070] Please refer to Figure 7 In other examples, the protrusion 113 may be a block structure 1132, and the block protrusion 113 may include multiple, at least some of the block structures 1132 are distributed along the circumference of the display area 1a or the dam 112. Among them, multiple protrusions 113 located in the same circle are a circle of protrusions 113, that is, a circle of protrusions 113 includes multiple block structures 1132. The protrusion 113 may be in the shape of a rounded prism, or the protrusion 113 is in the shape of a hemisphere, or the protrusion 113 is in the shape of a long strip.

[0071] In at least two circles of protrusions 113 arranged around the display area 1a, the structures of at least two circles of protrusions 113 may be the same or different. For example, at least two circles of protrusions 113 may both be annular structures 1131; or at least two circles of protrusions 113 may both be block structures 1132; or, in at least two circles of protrusions 113, part of the circles of protrusions 113 are annular structures 1131, and the other part are block structures 1132. The specific structure and distribution of the protrusions 113 are not limited thereto, and this embodiment is only used as an example.

[0072] Please refer to Figure 5 On the basis of any of the above embodiments, along the direction close to the light emitting side, that is, along the direction away from the flexible screen body 111, the cross-sectional area of ​​the protrusion 113 perpendicular to the thickness direction Z of the rollable display panel 1 and perpendicular to the curling direction of the rollable display panel 1 gradually decreases. In this way, the protrusion 113 can have a larger surface area, and the surface area of ​​the flexible screen body 11 close to the light emitting side can be increased.

[0073] Exemplarily, the protrusion 113 may have a first end connected to the flexible screen body 111 and a second end disposed opposite to the first end, and the protrusion 113 may also have a plurality of side surfaces connecting the first end and the second end, and at least some of the plurality of side surfaces of the protrusion 113 are inclined planes or curved surfaces. When both of the two oppositely disposed side surfaces are inclined planes or curved surfaces, the distance between the two oppositely disposed side surfaces becomes smaller and smaller in the direction away from the flexible screen body 111.

[0074] For example, the cross-section of the protrusion 113 along the thickness direction Z perpendicular to the rollable display panel 1 and perpendicular to the rolling direction of the rollable display panel 1 can be a trapezoidal surface or a semi-circular surface. Alternatively, the cross-section of the protrusion 113 along the thickness direction Z parallel to the rollable display panel 1 is a trapezoidal surface or a semi-circular surface.

[0075] Please refer to Figure 8 , based on any of the above embodiments, when the flexible screen body 11 has a plurality of dams 112 spaced apart in a direction away from the display area 1a, one or at least two circles of protrusions 113 can be provided between every two adjacent dams 112, and one or at least two circles of protrusions 113 can also be provided outside the outermost dam 112. In this way, the area of the surface of the flexible screen body 11 close to the light-emitting side can be further increased. Here, the specific number of the dams 112 in this embodiment is not limited, and the number of the dams 112 can be specifically set according to actual needs.

[0076] Exemplarily, the dam 112 can include an inner dam 1121 and an outer dam 1122. The outer dam 1122 is located on the side of the inner dam 1121 away from the display area 1a, and there is a certain distance between the inner dam 1121 and the outer dam 1122. In this way, the blocking effect can be improved.

[0077] Among them, the height of the inner dam 1121 along the thickness direction Z of the rollable display panel 1 can be lower than the height of the outer dam 1122, that is, the distance between the end of the inner dam 1121 away from the flexible screen body 111 and the flexible screen body 111 is less than the distance between the end of the outer dam 1122 away from the flexible screen body 111 and the flexible screen body 111. In this way, both the blocking effect on water and oxygen can be improved, and the occupation of space can be reduced.

[0078] At least part of the protrusions 113 are located on the side of the outer dam 1122 away from the display area 1a, and / or at least part of the protrusions 113 are located between the inner dam 1121 and the outer dam 1122. That is, the protrusions 113 are distributed on the side of the outer dam 1122 away from the display area 1a; or, the protrusions 113 are distributed in the area between the inner dam 1121 and the outer dam 1122; or, the protrusions 113 are distributed both on the side of the outer dam 1122 away from the display area 1a and in the area between the inner dam 1121 and the outer dam 1122. That is, the surface of the flexible screen body 111 on the side of the outer dam 1122 away from the display area 1a can be provided with protrusions 113; the surface of the flexible screen body 111 between the inner dam 1121 and the outer dam 1122 can also be provided with protrusions 113.

[0079] Based on any of the above embodiments, the distance between the surface of the encapsulation layer 12 covering the protrusion 113 near the light-emitting side and the surface of the flexible screen body 111 near the light-emitting side is less than or equal to the distance between the surface of the encapsulation layer 12 in the display area 1a near the light-emitting side and the surface of the flexible screen body 111 near the light-emitting side. In this way, it is possible to prevent the provided protrusion 113 from increasing the thickness of the rollable display panel 1.

[0080] That is to say, the height of the encapsulation layer 12 covering the protrusion 113 is less than or equal to the height of the encapsulation layer 12 in the display area 1a; that is, the maximum height of the part of the encapsulation layer 12 covering the protrusion 113 is less than or equal to the maximum height of the part of the encapsulation layer 12 in the display area 1a.

[0081] Exemplarily, the maximum height of the part of the second inorganic encapsulation layer 123 of the encapsulation layer 12 covering the protrusion 113 is less than or equal to the maximum height of the part of the second inorganic encapsulation layer 123 covering the organic encapsulation layer 122. That is to say, the maximum distance between the part of the second inorganic encapsulation layer 123 covering the protrusion 113 and the surface of the flexible screen body 111 near the light-emitting side is less than or equal to the maximum distance between the part of the second inorganic encapsulation layer 123 covering the organic encapsulation layer 122 and the surface of the flexible screen body 111 near the light-emitting side.

[0082] In some examples, the height of the protrusion 113 can also be less than the height of the adjacent dam 112, that is, the distance between the protrusion 113 and the surface of the flexible screen body 111 near the light-emitting side can be less than the distance between the adjacent dam 112 and the surface of the flexible screen body 111 near the light-emitting side. In this way, not only can the height of the second inorganic encapsulation layer 123 covering the protrusion 113 be reduced, increasing the area of the surface of the flexible screen body 11 near the light-emitting side, but also the rollable display panel 1 can be easily rolled up.

[0083] In some examples, the height of the protrusion 113 can also be less than or equal to the thickness of the flexible screen body 111. For example, the height of the protrusion 113 can be one-half or one-third of the thickness of the flexible screen body 111. In this way, not only can the height of the second inorganic encapsulation layer 123 covering the protrusion 113 be reduced, increasing the area of the surface of the flexible screen body 11 near the light-emitting side, but also the rollable display panel 1 can be easily rolled up. Of course, in this embodiment, the height of the protrusion 113 is not specifically limited here, and this is only an example here.

[0084] Please refer to Figure 9, based on any of the above embodiments, the encapsulation layer 12 located in the non-display area 1b is further provided with bonding holes 14. The bonding holes 14 extend in the direction towards the flexible screen body 111, that is, the bonding holes 14 extend in the direction away from the light-emitting side. The bonding holes 14 penetrate through the encapsulation layer 12, and a bonding member 15 formed by bonding glue is provided in the bonding holes 14. In this way, on the one hand, the bonding member 15 can bond with the first inorganic encapsulation layer 121 and the second inorganic encapsulation layer 123 of the encapsulation layer 12, and on the other hand, it can also bond with the flexible screen body 11, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0085] Wherein, the axial direction of the bonding hole 14 is parallel to the thickness direction Z of the rollable display panel 1, so as to reduce the preparation difficulty of the bonding hole 14 and improve the preparation efficiency of the rollable display panel 1. In other examples, there may also be an included angle between the axial direction of the bonding hole 14 and the thickness direction Z of the rollable display panel 1.

[0086] In some examples, the orthographic projection of at least part of the bonding holes 14 on the surface of the flexible screen body 111 close to the light-emitting side is located within the orthographic projection of the area between two adjacent protrusions 113 on the surface of the flexible screen body 111 close to the light-emitting side. In this way, the second inorganic encapsulation layer 123 covering the two adjacent protrusions 113 can form a groove, and the bonding member 15 can be arranged in the groove, so that the bonding area between the bonding member 15 and the second inorganic encapsulation layer 123 can be increased, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0087] In some examples, the orthographic projection of at least part of the bonding holes 14 on the surface of the flexible screen body 111 close to the light-emitting side may also be located within the orthographic projection of the area between the protrusion 113 and the dam 112 adjacent to it on the surface of the flexible screen body 111 close to the light-emitting side. In this way, a groove can be formed between the protrusion 113 and the dam 112 adjacent to it, and the bonding member 15 is arranged in the groove, which can increase the bonding area between the bonding member 15 and the encapsulation layer 12 and the flexible screen body 111, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0088] In addition, one or at least two circles of bonding holes 14 can be arranged around the display area 1a. When one circle of protrusions 113 includes a plurality of block structures 1132, the orthographic projection of the bonding holes 14 on the surface of the flexible screen body 111 close to the light-emitting side can be located within the orthographic projection of the area between two adjacent block structures 1132 on the surface of the flexible screen body 111 close to the light-emitting side, so as to further increase the bonding area between the bonding member 15 and the encapsulation layer 12 and the flexible screen body 111, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0089] Please refer to Figure 10, in some examples, the bonding holes 14 also extend into the flexible screen body 111. Among them, the extension distance of the bonding holes 14 in the flexible screen body 111 can be set according to actual needs. Exemplarily, the extension distance of the bonding holes 14 in the flexible screen body 111 is less than or equal to one-third of the thickness of the flexible screen body 111; for example, the extension distance of the bonding holes 14 in the flexible screen body 111 is one-fourth or one-fifth of the thickness of the flexible screen body 111. In this way, the bonding member 15 filled in the bonding holes 14 and the flexible screen body 111 can have a larger bonding area, which can increase the bonding force between the bonding member 15 and the flexible screen body 111, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0090] In this example, it can be understood that the opening position of the bonding holes 14 can avoid the area where the circuit is arranged in the flexible screen body 111 so as not to affect the electrical connection of the rollable display panel 1.

[0091] Please refer to Figure 11 , preferably, along the direction away from the light-emitting side, that is, along the direction towards the flexible screen body 111, the aperture of the bonding holes 14 gradually decreases, so that the hole wall of the bonding holes 14 has a larger area, and the bonding member 15 filled in the bonding holes 14 and the encapsulation layer 12 and the flexible screen body 111 can have a larger bonding area. Exemplarily, the bonding holes 14 can be conical holes or hemispherical holes or conical holes with multiple side lengths, etc.

[0092] Among them, the aperture can refer to the dimension of the bonding holes 14 along the direction perpendicular to the thickness direction Z of the rollable display panel 1 and perpendicular to the curling direction of the rollable display panel 1. Taking the bonding holes 14 as circular holes as an example, the aperture is the diameter of the circular holes.

[0093] Preferably, the material of the bonding member 15 can include inorganic glue. In this way, the bonding force between the bonding member 15 and the encapsulation layer 12 can be increased, thereby improving the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0094] Among them, in some examples, the bonding holes 14 can extend along the circumferential direction of the dam 112. Exemplarily, the bonding holes 14 can be closed annular holes extending along the circumferential direction of the dam 112. In this way, the preparation process of the rollable display panel 1 can be simplified. At this time, the aperture refers to the distance between two circumferentially extending edges of the annular hole.

[0095] In some other examples, there are multiple bonding holes 14, and at least some of the bonding holes 14 are circumferentially spaced along the dike 112. That is, a circle of bonding holes 14 includes multiple spaced-apart bonding holes 14. The bonding holes 14 can be round holes, rounded polygon holes, or elongated holes. When the bonding holes 14 are elongated holes, the hole diameter refers to the distance between the two edges of the elongated hole extending along the circumference of the display area 1a. In this way, the contact area between the bonding member 15 and the hole wall of the bonding hole 14 can be increased, thereby increasing the contact area between the bonding member 15 and the encapsulation layer 12 and the flexible screen body 111, and thus the connection reliability between the encapsulation layer 12 and the flexible screen body 11 can be improved.

[0096] Please refer to Figure 12 , on the basis of the above embodiments, the second inorganic encapsulation layer 123 located in the non-display area 1b is at least partially recessed toward the flexible screen body 111 to form a groove 16, and the groove 16 communicates with the bonding hole 14, and a bonding member 15 is disposed in the groove 16. In this way, the bonding member 15 can have a larger contact area with the second inorganic encapsulation layer 123, the adhesion between the bonding member 15 and the second inorganic encapsulation layer 123 can be increased, and the bonding member 15 is also bonded to the flexible screen body 111, thereby increasing the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0097] Among them, the groove 16 can have one circle or at least two circles. The orthographic projection of at least part of the circle of the groove 16 on the surface of the flexible screen body 111 close to the light-emitting side is located within the orthographic projection of the area between two adjacent protrusions 113 on the surface of the flexible screen body 111 close to the light-emitting side. In this way, the groove wall of the groove 16 can have a larger area, and more bonding members 15 can be filled in the groove 16, thereby increasing the contact area between the bonding member 15 and the second inorganic encapsulation layer 123.

[0098] When the groove 16 has at least two circles, the orthographic projection of part of the circle of the groove 16 on the surface of the flexible screen body 111 close to the light-emitting side is located within the orthographic projection of the area between the protrusion 113 and the adjacent dike 112 on the surface of the flexible screen body 111 close to the light-emitting side. In this way, the groove wall of the groove 16 can have a larger area, and more bonding members 15 can be filled in the groove 16, thereby increasing the contact area between the bonding member 15 and the second inorganic encapsulation layer 123.

[0099] Preferably, the orifice of the bonding hole 14 is located on the bottom wall 161 of the groove 16 away from the light-emitting side, and there is a preset distance between the edge of the orifice of the bonding hole 14 and the edge of the bottom wall 161 of the groove 16 facing the flexible screen body 111. In this way, the bonding member 15 can have a larger contact area with the encapsulation layer 12, which can increase the adhesive force between the bonding member 15 and the encapsulation layer 12. Moreover, the bonding member 15 is also bonded to the flexible screen body 111, thereby increasing the connection reliability between the encapsulation layer 12 and the flexible screen body 11.

[0100] The embodiment of the present application also provides a rollable display device, including a reel 2 and a rollable display panel 1. One end of the rollable display panel 1 is connected to the reel 2 so that the rollable display panel 1 can be wound up by the rotation of the reel 2. The structure, function, and implementation process of the rollable display panel 1 are the same as those of the foregoing embodiments, and will not be elaborated herein.

[0101] The rollable display device in this embodiment can be any product or component with a display function, such as a mobile phone, a tablet computer, a computer monitor, a smart watch, a digital photo frame, a navigator, etc. The embodiments of the present invention do not make specific limitations thereto.

[0102] In this specification, the embodiments or implementation manners are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0103] It should be noted that the embodiments referred to as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. in the specification may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when combining specific features, structures, or characteristics with an embodiment, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0104] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense.

[0105] As used herein, the term "layer" may refer to a portion of a material that includes a region having a certain thickness. A layer may extend over the entire underlying or overlying structure, or may have a smaller extent than the underlying or overlying structure. In addition, a layer may be a region of a homogeneous or heterogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure or between any pair of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a conical surface. A substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, thereabove, and / or therebelow. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and contact layers (in which contacts, interconnect lines, and / or vias are formed) and one or more dielectric layers.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rollable display panel, characterized in that, it has a display area and a non-display area; the rollable display panel includes: a flexible screen body, the flexible screen body includes a flexible screen main body, dams and protrusions; the dams and the protrusions are both arranged on one surface of the flexible screen main body close to the light-emitting side, the dams and the protrusions are both located in the non-display area, and the protrusions are located on one side of the dams away from the display area; a packaging layer, the packaging layer covers the flexible screen main body, the dams and the protrusions; The packaging layer located in the non-display area is also provided with bonding holes, the bonding holes extend in a direction away from the light-emitting side, the bonding holes penetrate through the packaging layer, and bonding members are arranged in the bonding holes.

2. The rollable display panel according to claim 1, characterized in that, There are at least two circles of protrusions arranged around the display area.

3. The rollable display panel according to claim 2, characterized in that, At least one circle of the protrusions is a ring structure; and / or, at least one circle of the protrusions includes a plurality of block structures, and at least part of the block structures are spaced apart along the circumferential direction of the dam.

4. The rollable display panel according to claim 2, characterized in that, At least two circles of the protrusions are spaced apart in a direction away from the display area.

5. The rollable display panel according to claim 1, characterized in that, Along the direction close to the light-emitting side, the cross-sectional area of the protrusion perpendicular to the thickness direction of the rollable display panel gradually decreases.

6. The rollable display panel according to claim 1, characterized in that, The dam includes an inner dam and an outer dam which are spaced apart, and the outer dam is located on one side of the inner dam away from the display area; At least part of the protrusions are located on one side of the outer dam away from the display area; and / or, at least part of the protrusions are located between the inner dam and the outer dam.

7. The rollable display panel according to any one of claims 1-6, characterized in that, The distance between the surface of the packaging layer covering the protrusion close to the light-emitting side and the surface of the flexible screen main body close to the light-emitting side is less than or equal to the distance between the surface of the packaging layer in the display area close to the light-emitting side and the surface of the flexible screen main body close to the light-emitting side.

8. The rollable display panel according to any one of claims 1-6, characterized in that, The axial direction of the bonding hole is parallel to the thickness direction of the rollable display panel.

9. The rollable display panel according to claim 8, characterized in that, The bonding hole extends into the flexible screen main body.

10. The rollable display panel according to claim 9, characterized in that, The orthographic projection of the bonding hole on the surface of the flexible screen main body close to the light-emitting side is located within the orthographic projection of the area between two adjacent protrusions on the surface of the flexible screen main body close to the light-emitting side; And / or, the orthographic projection of the bonding hole on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection on the surface of the flexible screen body close to the light-emitting side of the area between the protrusion and the adjacent dam.

11. The rollable display panel according to claim 9, wherein, In the direction away from the light-emitting side, the aperture of the bonding hole gradually decreases.

12. The rollable display panel according to claim 9, wherein, The material of the bonding member includes inorganic glue.

13. The rollable display panel according to claim 8, wherein, The dam is an annular structure extending along the circumferential direction of the display area; The bonding hole is arranged to extend along the circumferential direction of the dam; or, there are multiple bonding holes, and at least some of the bonding holes are spaced apart along the circumferential direction of the dam.

14. The rollable display panel according to claim 8, wherein, At least part of the encapsulation layer located in the non-display area is recessed towards the flexible screen body to form a groove, the groove communicates with the bonding hole, and the bonding member is arranged in the groove.

15. The rollable display panel according to claim 14, wherein, The orthographic projection of the groove on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection on the surface of the flexible screen body close to the light-emitting side of the area between two adjacent protrusions; And / or, the orthographic projection of the groove on the surface of the flexible screen body close to the light-emitting side is located within the orthographic projection on the surface of the flexible screen body close to the light-emitting side of the area between the protrusion and the adjacent dam.

16. The rollable display panel according to claim 14, wherein, The orifice of the bonding hole is located on the bottom wall of the groove away from the light-emitting side, and there is a preset distance between the edge of the orifice of the bonding hole and the edge of the bottom wall.

17. A rollable display device, wherein, comprising: A reel and the rollable display panel according to any one of claims 1-14, and the rollable display panel is connected to the reel.

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