Bendable support and flexible display module
By designing grooves and through holes on the metal layer of the OLED flexible display module and setting up an adhesive layer, the problem of the metal layer falling off from the adhesive during bending is solved, and a more stable bending effect and more High screen stability.
Patent Information
- Application Number
- CN202211382493.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-04
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2042-11-04
AI Technical Summary
When the OLED flexible display module bent inward, the adhesion between the metal layer and the glue is easily fallen off due to stress, resulting in unstable screen.
A bendable support is designed, by opening a first groove and a second groove on the metal layer and providing a first adhesive layer and a second adhesive layer on both sides of the metal layer, such that these adhesive layers are Connected through through holes, an integral structure is formed to reduce stress differences and to limit the forming of the adhesive layer by the annular edge portion.
It effectively reduces the stress difference between the metal layer and the adhesive layer, prevents the adhesive layer from falling apart, and thus makes the bend of the bendable support more labor-saving and smoother, and improves the stability of the screen.
Smart Images
Figure CN115713893B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of display technology, and in particular to a bendable support member and a flexible display module. Background Art
[0002] Folding flexible screen mobile phones will be the development trend in the future. At present, the mainstream folding flexible screen mobile phones on the market are inward-bending flexible screen mobile phones, so it is very meaningful to study inward-bending flexible screens. When the flexible screen mobile phone is bent inward, the metal layer and the glue in the OLED flexible module are subjected to greater stress, and the adhesion between the glue and the metal layer is easy to fall off. Summary of the invention
[0003] In one aspect, the present application provides a bendable support member to reduce the stress between the metal layer and the first adhesive layer and the second adhesive layer, and prevent the metal layer and the first adhesive layer from being separated from the second adhesive layer. The bendable support member includes a metal layer, a first side of the metal layer is provided with a plurality of first grooves, and the plurality of first grooves are interconnected through a first connecting groove; a first adhesive layer is formed on the first side of the metal layer, and the first adhesive layer is partially filled in the first groove and the first connecting groove.
[0004] In some embodiments, a second side of the metal layer relative to the first side is provided with a plurality of second grooves, and the plurality of second grooves are interconnected through second connecting grooves; a second adhesive layer is formed on the second side of the metal layer, and the second adhesive layer partially fills the second grooves and the second connecting grooves.
[0005] In some embodiments, the metal layer is provided with a plurality of through holes, and the first adhesive layer and the second adhesive layer are connected through the through holes; preferably, the first groove and the second groove are arranged correspondingly; preferably, at least some of the through holes also connect the correspondingly arranged first groove and the second groove.
[0006] In some embodiments, each of the through holes and the first groove and the second groove connected thereto have the same central axis.
[0007] In some embodiments, in the length direction and / or width direction of the metal layer, the size of the first groove is greater than the size of the second groove; preferably, the through hole, the first groove and the second groove all have a square cross-section.
[0008] In some embodiments, the first groove, the second groove and the through hole are arranged in rows and columns; preferably, in the length direction and the width direction of the metal layer, the through hole and the first connecting groove are arranged in rows and columns, and the through hole and the second connecting groove are arranged in rows and columns.
[0009] In some embodiments, the bendable support member also includes an annular edge portion extending in the thickness direction of the metal layer, the first annular edge of the annular edge portion extends beyond the first side, the second annular edge of the annular edge portion extends beyond the second side, the first adhesive layer is flush with the first annular edge, and the second adhesive layer is flush with the second annular edge.
[0010] In some embodiments, the first adhesive layer and the second adhesive layer are formed on the metal layer when the metal layer is in a bent state.
[0011] Another aspect of the embodiments of the present application provides a flexible display module, comprising any of the above-mentioned bendable support members.
[0012] In some embodiments, the flexible display module also includes an array substrate, which is located on one side of the bendable support member; preferably, the array substrate is located on the side of the metal layer away from the first adhesive layer, and the array substrate is bonded to the metal layer through the second adhesive layer; preferably, the array substrate includes a base plate connected to the second adhesive layer, and a touch screen, a polarizer, a third adhesive layer and a cover plate stacked in sequence on the base plate.
[0013] The present application provides a bendable support member, which can relieve the stress of the metal layer when the bendable support member is bent by opening a first groove on the metal layer and arranging a first adhesive layer on one side of the metal layer, thereby reducing the stress difference between the first adhesive layer and the metal layer; moreover, the metal layer and the first adhesive layer restrain each other and can resist the pulling force of the first adhesive layer wanting to detach, thereby making it difficult for the metal layer to detach from the first adhesive layer, thereby making the bending of the bendable support member more labor-saving and smooth. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, including:
[0015] Figure 1 This is a schematic cross-sectional structure diagram of a bendable support member in one embodiment of the present application;
[0016] Figure 2 For this application Figure 1 A schematic diagram of the unfolded state of the bendable support member in the illustrated embodiment;
[0017] Figure 3 For this application Figure 1 A schematic diagram of the unfolded state of the bendable support member in another viewing angle in the illustrated embodiment;
[0018] Figure 4 For this application Figure 2 A schematic cross-sectional view of the bendable support member at AA in the illustrated embodiment;
[0019] Figure 5 This is a schematic diagram of the structure of a flexible display module in one embodiment of the present application;
[0020] Figure 6 FIG. 4 is a schematic structural diagram of a flexible display module in another embodiment of the present application. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
[0022] It should be noted that the terms "first", "second", etc., hereinafter are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.
[0023] It should be noted that the terms “on…”, “formed on…” and “disposed on…” described in the present invention may indicate that one layer is directly formed or disposed on another layer, or may indicate that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers. In this document, unless otherwise specified, the term “located on the same layer” means that two layers, parts, components, elements or parts can be formed by the same patterning process, and that the two layers, parts, components, elements or parts are generally formed of the same material. In this document, unless otherwise specified, the expression “patterning process” generally includes steps such as coating, exposure, development, etching and stripping of photoresist. The expression “one-time patterning process” means a process of forming patterned layers, parts, components, etc. using a mask.
[0024] At present, during the process of the OLED flexible display module bending inward, the bendable support member used to provide support for the entire OLED flexible module will be subjected to greater stress. Among them, when the glue in the bendable support member is subjected to greater stress, the adhesion between the glue and the metal layer is easy to fall off.
[0025] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic cross-sectional structure diagram of a bendable support member in one embodiment of the present application; Figure 2 For this application Figure 1 A schematic diagram of the unfolded state of the bendable support member in the illustrated embodiment; Figure 3 For this application Figure 1 Schematic diagram of the unfolded state of the bendable support member in another perspective in the illustrated embodiment. The bendable support member 10 may include: a metal layer 101 having a plurality of through holes 104, a first adhesive layer 105 disposed on a first side of the metal layer 101, and a second adhesive layer 106 disposed on a second side of the metal layer 101 relative to the first side. The first adhesive layer 105 and the second adhesive layer 106 are connected through the through holes 104; that is, an adhesive material is also disposed in the through holes 104, thereby connecting the first adhesive layer 105 and the second adhesive layer 106 together. The material of the first adhesive layer 105 and the second adhesive layer 106 may be the same as the adhesive material in the through holes 104. Among them, a plurality of first grooves 102 are disposed on the first side of the metal layer 101. The plurality of first grooves 102 are interconnected through a first connecting groove 1021; that is, a plurality of first connecting grooves 1021 are disposed on the first side of the metal layer 101, and each two first grooves 102 are connected by a first connecting groove 1021. A plurality of second grooves 103 are provided on the second side of the metal layer 101. The second grooves 103 are connected to each other through the second connecting grooves 1031; that is, a plurality of second connecting grooves 1031 are provided on the second side of the metal layer 101, and every two second grooves 103 are connected through a second connecting groove 1031. Each through hole 104 connects a first groove 102 and a second groove 103. Each through hole 104 and the first groove 102 and the second groove 103 connected thereto have the same central axis.
[0026] The material of the metal layer 101 can be stainless steel, or steel, iron or other suitable metals or alloys, which are not specifically limited here. The metal layer 101 has good flexibility, and the metal layer can be a bendable structure. The shape of the metal layer 101 when unfolded can be a rectangle, or a square or other suitable shapes. The material of the first adhesive layer 105 and the second adhesive layer 106 can both be hot melt adhesives, which are used to fix the metal layer 101. The shapes of the first adhesive layer 105 and the second adhesive layer 106 are adapted to the shape of the metal layer 101. The first adhesive layer 105 and the second adhesive layer 106 are respectively bonded to the opposite sides of the metal layer 101.
[0027] It can be understood that the through hole 104 is opened on the metal layer 101 to connect the first adhesive layer 105 and the second adhesive layer 106 together, so that when the metal layer 101 is bent, the first adhesive layer 105 and the second adhesive layer 106 restrain each other and resist the pulling force that the first adhesive layer 105 and the second adhesive layer 106 want to separate, thereby achieving the purpose of preventing the first adhesive layer 105, the second adhesive layer 106 and the metal layer 101 from separating.
[0028] Furthermore, the first groove 102 is formed on the first side of the metal layer 101, the second groove 103 is formed on the second side of the metal layer 101, and the first groove 102 and the second groove 103 are arranged correspondingly, in order to reduce the thickness of the metal layer 101, so as to reduce the stress generated when the metal layer 101 is bent, thereby reducing the stress difference between the first adhesive layer 105 and the second adhesive layer 106 and the metal layer 101, thereby avoiding the first adhesive layer 105 and the second adhesive layer 106 from being separated from the metal layer 101. Among them, the first adhesive layer 105 and the second adhesive layer 106 are connected through the through hole 104. That is to say, the first adhesive layer 105 and the second adhesive layer 106 can be an integrated structure.
[0029] It can be understood that the first groove 102 and the second groove 103 are arranged correspondingly, which means that the projection of the first groove 102 on the metal layer 101 along the direction perpendicular to the metal layer 101 partially overlaps with the projection of the second groove 103 on the metal layer 101 along the direction perpendicular to the metal layer 101. A through hole 104 is arranged on the metal layer 101 at the overlapping portion of the projection, so that the through hole 104 can connect the first groove 102 and the second groove 103.
[0030] In some embodiments, when the metal layer 101 is in a bent state, hot melt adhesive is added to both sides of the metal layer 101 and cooled to solidify. When the hot melt adhesive is in a liquid state, the hot melt adhesive will completely fill the first groove 102, the second groove 103 and the through hole 104 to form the first adhesive layer 105 and the second adhesive layer 106, so the first adhesive layer 105 and the second adhesive layer 106 are integrally formed. Because the first adhesive layer 105 and the second adhesive layer 106 are also in a bent state after solidification, they have a tendency to maintain this bent state, so the first adhesive layer 105 and the second adhesive layer 106 can offset the stress of flattening, making the bendable support member 10 more labor-saving and smooth when bending.
[0031] A plurality of first connecting grooves 1021 are provided on the first side of the metal layer 101, and a plurality of second connecting grooves 1031 are provided on the second side of the metal layer 101. The function of the first connecting grooves 1021 is to connect all the first grooves 102, and the function of the second connecting grooves 1031 is to connect all the second grooves 103, so that the molding process of the first adhesive layer 105 and the second adhesive layer 106 is smoother, and the hot melt adhesive can flow smoothly between the first grooves 102, the second grooves 103, the through holes 104, the first connecting grooves 1021 and the second connecting grooves 1031. In addition, the provision of the first connecting grooves 1021 and the second connecting grooves 1031 can make the metal layer 101 smoother when bending, and the force is more evenly applied, and it is not easy to cause the metal layer 101 to break.
[0032] See also Figure 4 , Figure 4 For this application Figure 2 A schematic cross-sectional view of the bendable support member at AA in the illustrated embodiment. In one embodiment, the size of the first groove 102 is greater than the size of the second groove 103 in the length direction and / or width direction of the metal layer 101. It can be understood that the metal layer 101 can be divided into a length direction and a width direction, and the size B of the first groove 102 can be greater than the size C of the second groove 103 in the length direction; or the size of the first groove 102 can be greater than the size of the second groove 103 in the width direction; or the size of the first groove 102 is greater than the size of the second groove 103 in both the length direction and the width direction.
[0033] The first groove 102 is located on the outside of the metal layer 101, and the second groove 103 is located on the inside of the metal layer 101. If the size B of the first groove 102 in the length direction and / or the width direction is larger than the size C of the second groove 103, the stress on the outside of the metal layer 101 when the bendable support member 10 is bent can be reduced, making the bending more labor-saving and smooth, thereby improving the user experience.
[0034] In one embodiment, the through hole 104, the first groove 102 and the second groove 103 all have a square cross section. In another embodiment, the through hole 104, the first groove 102 and the second groove 103 may also have a circular, triangular or other suitable cross section, which is not specifically limited here.
[0035] The first grooves 102, the second grooves 103 and the through holes 104 may be arranged in rows and columns. Specifically, the first grooves 102, the second grooves 103 and the through holes 104 are arranged in an array on the metal layer 101, that is, the spacing between adjacent first grooves 102 in the length direction is equal, and the spacing between adjacent first grooves 102 in the width direction is equal. The arrangement of the second grooves 103 and the through holes 104 is the same as that of the first grooves 102, and will not be repeated here.
[0036] Further, in the length direction and the width direction of the metal layer 101 , the through holes 104 and the first connecting grooves 1021 are arranged in rows and columns, and the through holes 104 and the second connecting grooves 1031 are arranged in rows and columns.
[0037] In another embodiment, the first grooves 102, the second grooves 103 and the through holes 104 may not be arranged in rows and columns, and each through hole 104 may connect one first groove 102 and one second groove 103. In other words, the first grooves 102, the second grooves 103 and the through holes 104 may be arranged irregularly, and the distances between adjacent first grooves 102, second grooves 103 or through holes 104 may be different.
[0038] The first adhesive layer 105 includes two parts, one part is arranged in the first groove 102 and the first connecting groove 1021, and the other part completely covers the first side. The second adhesive layer 106 includes two parts, one part is arranged in the second groove 103 and the second connecting groove 1031, and the other part completely covers the second side.
[0039] It is understandable that during the molding process of the first adhesive layer 105, it is not only completely filled in the first groove 102, but also completely covers the first side of the metal layer 101. If the first adhesive layer 105 does not completely cover the first side of the metal layer 101, the metal layer 101 may be exposed, thereby causing damage to other components. The first side of the metal layer 101 refers to the side of the metal layer 101 where the first groove 102 is opened.
[0040] During the molding process of the second adhesive layer 106, the second groove 103 is not only completely filled, but also completely covers the second side of the metal layer 101. If the second adhesive layer 106 does not completely cover the second side of the metal layer 101, the metal layer 101 may be exposed, thereby causing damage to other components. The second side of the metal layer 101 refers to the side of the metal layer 101 where the second groove 103 is opened.
[0041] Please continue reading Figure 4The bendable support member 10 further includes an annular edge portion 107 extending in the thickness direction of the metal layer 101, a first annular edge 1071 of the annular edge portion 107 extending beyond the first side, and a second annular edge 1072 of the annular edge portion 107 extending beyond the second side. The first adhesive layer 105 is flush with the first annular edge 1071, and the second adhesive layer 106 is flush with the second annular edge 1072.
[0042] It can be understood that, during the molding process of the first adhesive layer 105, the hot melt adhesive is directly injected into the first groove 102, the through hole 104 and the second groove 103. In order to completely mold the first adhesive layer 105, an annular edge portion 107 is provided at the edge of the metal layer 101, so that the first adhesive layer 105 will not continue to extend outward when it contacts the annular edge portion 107, so that the first adhesive layer 105 can be restricted between the annular edge portions 107, so that the shape of the first adhesive layer 105 is substantially the same as that of the metal layer 101. Moreover, the annular edge portion 107 includes a first annular edge 1071 located on the first side, and the first annular edge 1071 extends beyond the first side, and the first adhesive layer 105 is flush with the first annular edge 1071.
[0043] Similarly, in order to completely form the second adhesive layer 106, an annular edge portion 107 is provided at the edge of the metal layer 101, so that the second adhesive layer 106 will not continue to extend outward when it contacts the annular edge portion 107, so that the second adhesive layer 106 can be confined between the annular edge portions 107, so that the shape of the second adhesive layer 106 is substantially the same as the shape of the metal layer 101. In addition, the annular edge portion 107 includes a second annular edge 1072 located on the second side, and the second annular edge 1072 extends beyond the second side, and the second adhesive layer 106 is flush with the second annular edge 1072.
[0044] The first adhesive layer 105 and the second adhesive layer 106 are disposed on the metal layer 101 when the metal layer 101 is in a bent state. Specifically, in order to facilitate the bending of the bendable support member 10, when forming the first adhesive layer 105 and the second adhesive layer 106, the metal layer 101 is first bent, and when the metal layer 101 is in a bent state, hot melt adhesive is injected into the metal layer 101, and then the hot melt adhesive is cooled and condensed to form. The hot melt adhesive after forming will be divided into the first adhesive layer 105 and the second adhesive layer 106. Since the solidified first adhesive layer 105 and the second adhesive layer 106 are also in a bent state, the stress of the first adhesive layer 105 and the second adhesive layer 106 can offset the stress of the metal layer 101 that wants to be flattened, making the bending more labor-saving and smooth. That is to say, since the first adhesive layer 105 and the second adhesive layer 106 are in a bent state during molding, the metal layer 101 needs to overcome a certain force when it is flattened. Similarly, when the metal layer 101 changes from a flat state to a bent state, the first adhesive layer 105 and the second adhesive layer 106 will also provide a certain force for bending, so as to make the bending more labor-saving and smooth.
[0045] The present application provides a bendable support member 10, which can relieve the stress of the metal layer 101 when the bendable support member 10 is bent by opening a first groove 102 on the metal layer 101 and setting a first adhesive layer 105 on one side of the metal layer 101, thereby reducing the stress difference between the first adhesive layer 105 and the metal layer 101; moreover, the metal layer 101 and the first adhesive layer 105 restrain each other, resisting the pulling force of the first adhesive layer 105 wanting to detach, thereby making it difficult for the metal layer 101 to detach from the first adhesive layer 105, thereby making the bending of the bendable support member 10 more labor-saving and smooth.
[0046] See also Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of a flexible display module in one embodiment of the present application; Figure 6 Schematic diagram of the structure of a flexible display module in another embodiment of the present application. The embodiment of the present invention also provides a display module 100, comprising any of the above-mentioned bendable support members 10. The display module 100 may also include an array substrate 20, which is located on one side of the bendable support member 10; in this embodiment, the array substrate 20 is located on the side of the metal layer 101 away from the first adhesive layer 105, and the array substrate 20 is bonded to the metal layer 101 through the second adhesive layer 106. The array substrate 20 includes a bottom plate 201 connected to the second adhesive layer 106, and a touch screen 202, a polarizer 203, a third adhesive layer 204 and a cover plate 205 stacked in sequence on the bottom plate.
[0047] In some embodiments, the array substrate 20 is located on a side of the metal layer 101 close to the first adhesive layer 105 , and the array substrate 20 is bonded to the metal layer 101 through the first adhesive layer 105 .
[0048] In some embodiments, the display module 100 provided in the embodiment of the present application can be: a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, and any other product or component with a display function. The display module 100 provided in the embodiment of the present application may also include, but is not limited to: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. It can be understood by those skilled in the art that the composition of the above-mentioned display module 100 does not constitute a limitation on the display module 100, and the display module 100 may include more or less of the above-mentioned components, or combine certain components, or arrange the components differently.
[0049] In the description of this specification, the description of the terms "one embodiment", "another embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.
Claims
1. A bendable support member, characterized in that: include: A metal layer, wherein a first side of the metal layer is provided with a plurality of first grooves, and the plurality of first grooves are interconnected through a first connecting groove; A first adhesive layer formed on a first side of the metal layer, wherein the first adhesive layer partially fills the first groove and the first connecting groove; A second side of the metal layer relative to the first side is provided with a plurality of second grooves, and the plurality of second grooves are interconnected through second connecting grooves; a second adhesive layer formed on a second side of the metal layer, wherein the second adhesive layer partially fills the second groove and the second connecting groove; The metal layer is provided with a plurality of through holes, the first adhesive layer is connected to the second adhesive layer through the through holes, and the first groove, the second groove, the through holes, the first connecting groove and the second connecting groove are arranged in rows and columns in the length direction and the width direction of the metal layer; In the length direction and / or width direction of the metal layer, the size of the first groove is larger than the size of the second groove, and when the support member is bent, the first groove is located on the inner side of the metal layer, and the second groove is located on the outer side of the metal layer; The first adhesive layer and the second adhesive layer are formed on the metal layer when the metal layer is in a bent state.
2. The bendable support member according to claim 1, characterized in that: The first groove and the second groove are arranged correspondingly.
3. The bendable support member according to claim 2, characterized in that: Each of the through holes and the first groove and the second groove connected therewith have the same central axis.
4. The bendable support member according to claim 2, characterized in that: The through hole, the first groove and the second groove all have a square cross-section.
5. The bendable support member according to claim 1, characterized in that: The bendable support member also includes an annular edge portion extending in the thickness direction of the metal layer, a first annular edge of the annular edge portion extends beyond the first side, a second annular edge of the annular edge portion extends beyond the second side, the first adhesive layer is flush with the first annular edge, and the second adhesive layer is flush with the second annular edge.
6. A flexible display module, characterized in that: It comprises a bendable support member as described in any one of claims 1 to 5.
7. The flexible display module according to claim 6, characterized in that: Also included is an array substrate, the array substrate being located on one side of the bendable support member; The array substrate is located on a side of the metal layer away from the first adhesive layer, and the array substrate is bonded to the metal layer through the second adhesive layer; The array substrate includes a bottom plate connected to the second adhesive layer, and a touch screen, a polarizer, a third adhesive layer and a cover plate which are sequentially stacked on the bottom plate.
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