A support structure, a display panel, a flexible display module and a flexible display device

Abstract

The present application relates to the technical field of display, in particular to a support structure, a display panel, a flexible display module and a flexible display device; the support structure comprises a support layer, a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on one side of the support layer, and the second adhesive layer is arranged on the other side of the support layer; a plurality of communication holes are arranged on the second adhesive layer and communicate from the second adhesive layer to the support layer, and a filler is arranged in the communication hole; the filler connects the second adhesive layer and the support layer into an integrated whole along the opening direction of the communication hole. The present application can solve the technical problem that the stress difference of each area of the existing display module is different during the curling process, which causes the separation and deformation between each film layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a support structure, a display panel, a flexible display module and a flexible display device. BACKGROUND

[0002] At present, most of the display modules on the market are in the form of folding, and the folding area (also called the bending area) is fixed. As shown in the figure, the folding area 11 is generally fixedly arranged at the middle portion of the display screen 1. In order to further reduce the device size and improve portability, manufacturers have gradually begun to use display modules in the form of overall curling. The curling of the flexible display screen is usually achieved by fixing the winding head of the flexible display module to the curling shaft, and winding the winding tail around the curling shaft. Figure 1

[0003] However, during the curling process, the flexible display module has stress as the winding action proceeds, and the stress of each area of the flexible display module is different, thereby causing the peeling and deformation between each film layer. The existing improvement scheme on the market is to try to reduce the film layer stacking and thickness, such as reducing the thickness of the flexible cover plate, the polarizing plate POL, and the stainless steel sheet, so as to reduce the stress difference of each area. However, with the reduction of the thickness, the manufacturing cost will inevitably increase, which is not conducive to the cost control of mass production. SUMMARY

[0004] The embodiments of the present application provide a support structure, a display panel, a flexible display module and a flexible display device, which can solve the technical problem that the stress of each area of the existing flexible display module is different during the curling process, thereby causing the peeling and deformation between each film layer.

[0005] In a first aspect, the embodiments of the present application provide a support structure, comprising a support layer, a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on one side of the support layer, and the second adhesive layer is arranged on the other side of the support layer; a plurality of communication holes are arranged on the second adhesive layer, the communication holes are communicated from the second adhesive layer to the support layer, and a filler is arranged in the communication holes; the filler connects the second adhesive layer and the support layer into one body along the arrangement direction of the communication holes.

[0006] In a preferred embodiment, the communication holes penetrate or do not penetrate the second adhesive layer.

[0007] Preferably, the communication holes penetrate or do not penetrate the support layer.

[0008] In a preferred embodiment, the communication holes penetrate the support layer and are communicated to the first adhesive layer; the filler connects the first adhesive layer, the support layer and the second adhesive layer into one body along the arrangement direction of the communication holes.

[0009] ​Preferably, the through hole penetrates or does not penetrate the first adhesive layer.

[0010] Preferably, the support layer is a metal support layer; further preferably, the metal support layer is a stainless steel sheet.

[0011] Preferably, the filler is a glue; further preferably, the glue is a hot melt glue.

[0012] In a preferred embodiment, the opening direction of the through hole is inclined from one end of the support structure to the other end, and the included angle between the through hole and the second adhesive layer is an inclination angle.

[0013] Preferably, the inclination angles of the plurality of through holes continuously decrease from one end of the support structure to the other end.

[0014] In a second aspect, the embodiments of the present application provide a display panel, comprising a screen body and the above-mentioned support structure, wherein the screen body is connected to the support structure through the first adhesive layer.

[0015] In a third aspect, the embodiments of the present application provide a flexible display module, comprising the above-mentioned display panel, and a polarizing plate and a flexible cover plate which are sequentially stacked on the display panel, wherein the polarizing plate and the display panel are adhered through a third adhesive layer.

[0016] Preferably, the flexible display module further comprises a coiled first end and a coiled end which are oppositely arranged; when coiled, the coiled end is wound outside the coiled first end; the opening direction of the through hole is inclined towards the coiled end of the flexible display module, and the included angle between the through hole and the second adhesive layer is an inclination angle.

[0017] Preferably, the inclination angles of the plurality of through holes continuously decrease from the coiled first end to the coiled end.

[0018] In a fourth aspect, the embodiments of the present application further provide a flexible display device, comprising a flexible display module, a support movement structure and a coiling driving structure, wherein the support movement structure comprises a first end and a second end; the flexible display module is fixed on the support movement structure, wherein the first end of the support movement structure corresponds to the coiled first end of the flexible display module, and the second end of the support movement structure is fixed on the coiling driving structure; the flexible display module is the flexible display module provided by the embodiments of the present application.

[0019] When the flexible display module is coiled, the filler exerts a force on the flexible display module in the opening direction of the through hole, and the force is used to offset the stress suffered by the flexible display module when coiled.

[0020] Compared with the prior art, the support structure, the display panel, the flexible display module and the flexible display device provided by the embodiments of the present application have the through holes in the adhesive layer and the metal support layer, the through holes are filled with the filler, the adhesive layer and the metal support layer are integrated in the vertical direction, the force between the adhesive layer and the metal support layer is strengthened, and peeling between the adhesive layer and the metal support layer is avoided. Since the film layer thickness does not need to be reduced or the film layer structure needs to be additionally increased, the flexible display module is low in manufacturing cost and easy to popularize and apply.

[0021] In addition, the through holes in the present application can be further designed to be inclined relative to the film layer, so that a pulling force can be provided in the curling process of the flexible display module, the stress generated by curling is offset, and peeling between the adhesive layer and the metal support layer is further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0023] Figure 1 is a structural schematic diagram of a folding screen in the prior art;

[0024] Figure 2 is a schematic diagram of through holes between the metal support layer and the second adhesive layer of the flexible display module;

[0025] Figure 3 is a schematic diagram of the through holes between the metal support layer and the second adhesive layer of the flexible display module penetrating the first adhesive layer;

[0026] Figure 4 is a schematic diagram of the through holes in the flexible display module being arranged at an inclined angle;

[0027] Figure 5 is a top view of the through holes in the flexible display module;

[0028] Figure 6 is a structural schematic diagram of the inclined angle of the through holes in the flexible display module gradually changing;

[0029] Fig. 7(a) is a force analysis schematic diagram of the through holes in the flexible display module gradually changing the inclined angle;

[0030] Fig. 7(b) is an enlarged schematic diagram of part A of the force analysis schematic diagram of the through holes in the flexible display module gradually changing the inclined angle;

[0031] Fig. 7(c) is an enlarged schematic view of part B in the force analysis diagram of the gradual change of the inclined angle of the through hole in the flexible display module;

[0032] Figure 8 Fig. 1 is a structural schematic diagram of a flexible display device.

[0033] BRIEF DESCRIPTION OF DRAWINGS: 1, display screen; 11, folding area; 2, rolling driving structure; 3, supporting movement structure; 100, flexible display module; 110, rolling head; 120, rolling tail; 10, screen body; 20, metal supporting layer; 30, first adhesive layer; 40, second adhesive layer; 50, through hole; 60, glue; 70, polarizer; 80, flexible cover plate; 90, third adhesive layer. DETAILED DESCRIPTION

[0034] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0035] It should be noted that in the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below in combination with the drawings.

[0037] Embodiment 1

[0038] As Figure 2As shown, the flexible display module 100 in the embodiment includes a display panel, and a polarizer 70 and a flexible cover plate 80 which are sequentially stacked on the display panel. The flexible cover plate 80 and the polarizer 70, and the polarizer 70 and the display panel can be adhered by a third adhesive layer 90. The display panel includes a screen body 10 and a support structure, and the support structure includes a metal support layer 20. The screen body includes a display surface and a back surface, and the metal support layer is arranged on the back surface of the screen body to support the screen body. It can be understood that the display surface is the side surface of the screen body capable of displaying images. The display module disclosed in the embodiment can be applied to the fields of mobile phones, bionic electronics, electronic skin, wearable devices, vehicle-mounted devices, Internet of Things devices, artificial intelligence devices, etc. For example, the above can be applied to display devices such as mobile phones, tablets, palmtop computers, iPods, smart watches, etc. The parts of the flexible display module will be introduced one by one as follows.

[0039] The screen body can be an organic light emitting diode (OLED) display panel, a liquid crystal display (LCD) display panel or electronic paper which has a bending deformation capability. Taking the organic light emitting diode display panel as an example, the screen body includes a substrate, a thin film transistor (TFT) layer, an anode, a display light emitting layer, a cathode and an encapsulation layer which are sequentially stacked.

[0040] In the embodiment, the metal support layer is a stainless steel sheet which has good bending strength and bendable performance and is suitable to be used as the support layer material in the flexible display module. In addition, the metal support layer can also be made of copper, copper alloy or aluminum which are commonly used in the flexible display module and have good bendable performance.

[0041] In the embodiment, the support structure further includes a first adhesive layer 30 and a second adhesive layer 40. One side of the metal support layer is adhered to the screen body by the first adhesive layer, and the second adhesive layer is arranged on the other side of the metal support layer. The second adhesive layer is used to fix the flexible display module on a display device.

[0042] A plurality of communication holes 50 are formed on the second adhesive layer and communicate from the second adhesive layer to the metal support layer, that is, the metal support layer and the second adhesive layer are formed with communication holes that communicate with each other, the communication holes are filled with a gel 60, and the gel integrally connects the second adhesive layer and the metal support layer along the direction in which the communication holes are formed. In the above manner, the gel can play the role of a columnar reinforcing rib, so that the second adhesive layer and the metal support layer can also generate adhesive force in the direction in which the communication holes are formed, and the adhesive area of the two is increased, so that the adhesive force between the second adhesive layer and the metal support layer is finally strengthened. The communication holes 50 can or can not penetrate the second adhesive layer 40 and / or the metal support layer 20. When the communication holes are arranged to not penetrate the second adhesive layer and the metal support layer, the communication holes are blind holes in the second adhesive layer and the metal support layer. When the communication holes 50 are arranged to penetrate the second adhesive layer 40, the gel can be filled from the side of the second adhesive layer away from the metal support layer, which is convenient for production and processing. When the communication holes 50 are arranged to penetrate the metal support layer 20, the adhesive force generated by the gel in the communication holes can be increased, and the gel can also reach the surface of the first adhesive layer 30.

[0043] Therefore, as shown in the embodiment, the metal support layer and the second adhesive layer can be further preferably connected by the communication holes penetrating the metal support layer and communicating with the first adhesive layer, that is, the first adhesive layer, the metal support layer and the second adhesive layer are formed with communication holes that communicate with each other, the communication holes are filled with a gel, and the gel integrally connects the first adhesive layer, the metal support layer and the second adhesive layer along the direction in which the communication holes are formed. The communication holes can or can not penetrate the first adhesive layer, that is, the communication holes can be blind holes that penetrate the metal support layer from the second adhesive layer and extend into the first adhesive layer, or the communication holes can be through holes that penetrate the metal support layer and the first adhesive layer from the second adhesive layer. Figure 3

[0044] The opening direction of the communication holes in the embodiment is inclined from one end of the support structure to the other end, and the included angle between the communication holes and the second adhesive layer is an inclined angle.

[0045] In order to further avoid the problem of mutual peeling between the film layers of the support structure when bending, the inclined angles of the plurality of communication holes in the embodiment continuously decrease from one end of the support structure to the other end. Specifically, the inclined angles continuously decrease along the curling direction. When curling, the filler of the communication holes can give a decomposing force to the metal support layer, and the force continuously increases along the curling direction, so as to offset or completely offset the stress generated between the film layers when curling.

[0046] Specifically, as an optional embodiment, as shown in the embodiment, the inclined angles of the plurality of communication holes continuously decrease from one end of the support structure to the other end. Figure 4 , 5 ​As shown, the flexible display module further includes a curling head end 110 and a curling tail end 120 which are arranged oppositely; when in curling use, the curling tail end is wound around the outside of the curling head end. The opening direction of the communication hole is inclined towards the curling tail end of the flexible display module, and the included angle with the second adhesive layer is an inclination angle A° (where A is an acute angle). When the flexible display module is curled, in the opening direction of the communication hole, the filled colloid gives a force F to the first adhesive layer 1Y , (n+1)N , nN , , , 2Y , (n+1)Y , nY , (n+1)Y ,

[0049] ,

[0048] , nY , and gives a force F to the metal support layer 2N ; through the decomposition of forces, the two forces are respectively decomposed into F 1Y and F 2Y in the vertical direction Y (i.e., the thickness direction of the support structure), and decomposed into F 1X and F 2X in the horizontal direction X (i.e., the width direction of the support structure), where F 1Y = F 1N * COS A, F 2Y = F 2N * COS A; F 1Y can offset or be greater than the stress received by the first adhesive layer in the vertical direction during curling, making it not easy for the first adhesive layer and the metal support layer to peel off; F[[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​As an optional embodiment, the above-mentioned colloid is a hot melt adhesive.

[0050] Embodiment 2

[0051] Based on the same inventive concept as the flexible display module provided in Embodiment 1, the present application also provides a flexible display device comprising the flexible display module described in Embodiment 1. As shown in Figure 8 The flexible display device of the present embodiment comprises a flexible display module 100, a support movement structure 3 and a curling driving structure 2. The support movement structure comprises a first end and a last end. The flexible display module is fixed on the support movement structure, wherein the first end of the support movement structure corresponds to the curling first end of the flexible display module, and the last end of the support movement structure is fixed on the curling driving structure.

[0052] In the present embodiment, when the flexible display module is curled, the colloid filled in the through hole will respectively generate a force on the metal support layer and the first adhesive layer of the flexible display module in the opening direction of the through hole, and the generated force is used to offset the stress suffered by the metal support layer and the first adhesive layer when the flexible display module is curled.

[0053] In some embodiments, the support movement mechanism is a chain type structure. The curling driving structure can be a roller, and a motor rotating mechanism is arranged in the roller.

[0054] It should be noted that the present application is not limited to the specific configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of well-known methods are omitted herein. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application.

[0055] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from that in the embodiments, or several steps can be performed simultaneously.

[0056] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0057] The above merely provides the specific implementation of the present application. For the convenience and brevity of description, the specific working processes of the system, module and unit described above can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein. It should be understood that the protection scope of the present application is not limited in this way. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A flexible display module, characterized in that, It includes a display panel, and a polarizer and a flexible cover plate stacked sequentially on the display panel. The polarizer and the display panel are bonded together by a third adhesive layer. The display panel includes a screen body and a supporting structure; The support structure includes a support layer, a first adhesive layer, and a second adhesive layer. The first adhesive layer is disposed on one side of the support layer, and the second adhesive layer is disposed on the other side of the support layer. A plurality of connecting holes are formed on the second adhesive layer, which connect to the support layer. The connecting holes are filled with a filler. The filler connects the second adhesive layer and the support layer together along the direction of the connecting holes. The screen is connected to the support layer of the support structure via a first adhesive layer; The flexible display module also includes a curled head end and a curled tail end that are arranged opposite to each other; when curled, the curled tail end is wrapped around the outside of the curled head end; the opening direction of the connecting hole is inclined towards the curled tail end of the flexible display module, and the angle between the connecting hole and the second adhesive layer is an inclination angle; the inclination angle of the several connecting holes gradually decreases from the curled head end to the curled tail end.

2. The flexible display module according to claim 1, characterized in that, The connecting hole may or may not penetrate the second adhesive layer.

3. The flexible display module according to claim 1, characterized in that, The connecting hole may or may not penetrate the support layer.

4. The flexible display module according to claim 3, characterized in that, The connecting hole penetrates the support layer and connects to the first adhesive layer; the filler connects the first adhesive layer, the support layer and the second adhesive layer together in the direction of the connecting hole.

5. The flexible display module according to claim 4, characterized in that, The connecting hole may or may not penetrate the first adhesive layer.

6. The flexible display module according to claim 5, characterized in that, The support layer is a metal support layer.

7. The flexible display module according to claim 6, characterized in that, The metal support layer is made of stainless steel sheet.

8. The flexible display module according to claim 4, characterized in that, The filler is a colloid.

9. The flexible display module according to claim 8, characterized in that, The colloid is a hot melt adhesive.

10. A flexible display device, comprising a flexible display module, a supporting motion structure, and a curling drive structure, wherein the supporting motion structure includes a head end and an end end; the flexible display module is fixed on the supporting motion structure, wherein the head end of the supporting motion structure corresponds to the curling head end of the flexible display module, and the head end of the supporting motion structure is fixed on the curling drive structure; characterized in that, The flexible display module is the flexible display module according to any one of claims 1-9.

11. The flexible display device according to claim 10, characterized in that, The supporting motion structure is a chain-like structure.

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