Flexible display panel and flexible display device
By setting up a stacked structure and a grid structure on the metal traces of the flexible display panel, the problem of stress concentration during bending is solved, and the stable signal transmission and display function is ensured.
Patent Information
- Application Number
- CN202210005184.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-01-05
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2042-01-05
AI Technical Summary
The metal traces in the bendable display panel are prone to break during bending, affecting the display function.
A flexible display panel is designed, using a first layer trace and a second layer trace arranged in stacked, and a grid structure is set on at least one of them to release stress through the grid structure to avoid stress concentration, connecting the wire with the first The layer trace is integrated to ensure signal transmission.
It effectively avoids breaking of metal traces when bent, ensures the display function of the bendable display panel, and reduces signal loss.
Smart Images
Figure CN114420704B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technology, and in particular to a flexible display panel and a flexible display device. Background Art
[0002] With the rapid development of flexible display technology, products with flexible narrow borders and high screen-to-body ratio are favored by the market, especially portable flexible mobile terminal products. Bendable display panels can not only provide large-screen display, but also improve portability.
[0003] However, the metal wiring in the bendable display panel is easily broken during the bending process, thereby affecting the display function of the bendable display panel. Summary of the invention
[0004] The embodiments of the present application provide a flexible display panel and a flexible display device, which solve the problem that metal wiring is easily broken during the folding process of the existing flexible panel.
[0005] An embodiment of the present application provides a flexible display panel, the flexible display panel comprising:
[0006] An isolation layer, wherein a plurality of vias are provided on the isolation layer;
[0007] Metal routing, the metal routing comprising a first layer routing and a second layer routing, the first layer routing and the second layer routing are arranged on both sides of the isolation layer, at least one of the first layer routing and the second layer routing is provided with a grid structure, and the grid structure is provided with a plurality of meshes;
[0008] A connecting wire is disposed in the conducting hole, the connecting wire is integrally formed with the first layer of wiring, and is used to connect the first layer of wiring and the second layer of wiring.
[0009] Optionally, at least a partial area of the first layer of wiring is provided with the grid structure, and the second layer of wiring is a block structure.
[0010] Optionally, the first layer of routing is the grid structure, and the second layer of routing is a block structure.
[0011] Optionally, at least part of the first layer of routing is provided with a first grid structure, and at least part of the second layer of routing is provided with a second grid structure, and the orthographic projection of the first grid structure on the isolation layer does not overlap with the orthographic projection of the second grid structure on the isolation layer.
[0012] Optionally, at least part of the first layer of routing is provided with a first grid structure, at least part of the second layer of routing is provided with a second grid structure, and the orthographic projection of the first grid structure on the isolation layer partially overlaps with the orthographic projection of the second grid structure on the isolation layer.
[0013] Optionally, the flexible display panel includes a bending zone. When the flexible display panel is in a bent state, the stress in the central area of the bending zone is greater than the stress on the side of the bending zone, and the mesh area of the grid structure gradually increases from the side of the bending zone to the central area.
[0014] Optionally, the metal wiring is used to transmit one of an ESD signal, a VSS signal or a VDD signal.
[0015] Optionally, the width of the metal trace ranges from 50 microns to 2000 microns.
[0016] Optionally, the flexible display panel includes a plurality of the metal wirings, wherein the metal wiring for transmitting the ESD signal is a ring structure, the metal wiring for transmitting the VSS signal is a ring structure, and the metal wiring for transmitting the VDD signal is a strip structure.
[0017] An embodiment of the present application further provides a flexible display device, comprising the flexible display panel as described in any one of the above items.
[0018] The beneficial effect of the present application is that the metal wiring in the flexible display panel provided by the embodiment of the present application includes a first layer wiring and a second layer wiring arranged in layers, and a plurality of connecting wires connecting the first layer wiring and the second layer wiring, wherein the plurality of connecting wires are integrally formed with the first layer wiring. By setting a grid structure on at least one of the first layer wiring and the second layer wiring, the stress can be released through the grid structure when the flexible display panel is bent, thereby solving the problem of stress concentration and avoiding the metal wiring from being broken when the flexible display panel is bent, thereby ensuring the display function of the bendable display panel. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] Figure 1 A schematic diagram of a portion of the structure of a flexible display panel provided in an embodiment of the present application;
[0022] Figure 2 for Figure 1 A schematic diagram of a first structure of metal wiring in a flexible display panel is shown;
[0023] Figure 3 for Figure 1 A second structural schematic diagram of metal wiring in a flexible display panel is shown;
[0024] Figure 4 for Figure 1 A third structural schematic diagram of metal wiring in a flexible display panel is shown;
[0025] Figure 5 A schematic diagram of the structure of a flexible display panel provided in an embodiment of the present application;
[0026] Figure 6 for Figure 1 A schematic diagram of a first application structure of metal routing in a flexible display panel is shown; Figure 7 for Figure 1 A schematic diagram of a second application structure of metal routing in a flexible display panel is shown. DETAILED DESCRIPTION
[0027] 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, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0029] The metal traces in the bendable display panel have poor bending performance. When the metal traces are bent too much or the bending radius is too small, the stress concentration may cause them to break easily.
[0030] Therefore, in order to solve the above problems, the present application proposes a flexible display panel and a flexible display device. The present application will be further described below in conjunction with the accompanying drawings and implementation examples.
[0031] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of a portion of the structure of a flexible display panel provided in an embodiment of the present application; Figure 2 for Figure 1A schematic diagram of a first structure of a metal wiring in a flexible display panel is shown. The embodiment of the present application provides a flexible display panel 100, the flexible display panel 100 includes a display area and a non-display area and a metal wiring 10 arranged in the non-display area, the metal wiring 10 includes a first layer wiring 110, a second layer wiring 120 arranged in a stacked manner, and a plurality of connecting wires 30 connecting the first layer wiring 110 and the second layer wiring 120. A grid structure 40 is arranged on at least one of the first layer wiring 110 and the second layer wiring 120, and a plurality of meshes are arranged on the grid structure 40. The present application sets a grid structure 40 on at least one of the first layer wiring 110 and the second layer wiring 120, so that when the flexible display panel 100 is bent, stress can be released through the grid structure 40, thereby solving the problem of stress concentration and avoiding the metal wiring 10 from breaking when the flexible display panel 100 is bent, thereby ensuring the display function of the bendable display panel. In addition, because the metal wiring 10 is a stacked first layer wiring 110 and a second layer wiring 120, the wiring resistance is reduced, thereby reducing signal loss.
[0032] It should be noted that the flexible display panel 100 further includes an isolation layer 20, which is disposed between the first layer wiring 110 and the second layer wiring 120. The isolation layer 20 is an insulating layer, which insulates the first layer wiring 110 and the second layer wiring 120 in the manufacturing process. A plurality of via holes 210 are disposed on the isolation layer 20, and a connecting wire 30 is disposed in the via hole 210. The connecting wire 30 is formed integrally with the first layer wiring 110. The connecting wire 30 is used to connect the first layer wiring 110 and the second layer wiring 120. In some embodiments, the connecting wire 30 in the via hole 210 is deposited into the via hole 210 when the first layer wiring 110 is formed into a film, so as to form the connecting wire 30. In some other embodiments, the via hole 210 may be filled with a portion of the connecting wire 30, or each via hole 210 may be completely filled with the connecting wire 30, so as to better transmit the signal between the first layer wiring 110 and the second layer wiring 120.
[0033] It is understandable that the position and number of the via holes 210 on the isolation layer 20 are arbitrary and need to be set according to actual conditions, and the size of each via hole 210 is also designed according to actual conditions. It only needs to be able to connect the first layer routing 110 and the second layer routing 120 through the connecting line 30, so that when a metal wire in the first layer routing 110 or the second layer routing 120 is broken, it will not affect the signal transmission and will not increase the signal loss.
[0034] At least one of the first layer routing 110 and the second layer routing 120 is provided with a grid structure 40, which can be a grid structure 40 provided on the first layer routing 110, and the second layer routing 120 is a block structure. In some embodiments, at least one of the first layer routing 110 and the second layer routing 120 is provided with a grid structure 40, which can be a grid structure 40 provided on the second layer routing 120, and the first layer routing 110 is a block structure. In some embodiments, at least one of the first layer routing 110 and the second layer routing 120 is provided with a grid structure 40, which can be a grid structure 40 provided on the second layer routing 120, and the first layer routing 110 is provided with a grid structure 40.
[0035] For example, please refer to Figure 3 , Figure 3 for Figure 1 The second structural schematic diagram of the metal routing in the flexible display panel shown, in some embodiments, the first layer routing 110 can be a plate-like structure, and a grid structure 40 is provided in a partial area of the plate-like structure, and the second layer routing 120 is a plate-like structure, and the grid structure 40 is not provided on the plate-like structure. In some embodiments, the second layer routing 120 can be a plate-like structure, and a grid structure 40 is provided in a partial area of the plate-like structure, and the first layer routing 110 is a plate-like structure, and the grid structure 40 is not provided on the plate-like structure. In some embodiments, the first layer routing 110 is a grid structure 40, and the second layer routing 120 can be a plate-like structure. In some embodiments, the second layer routing 120 is a grid structure 40, and the first layer routing 110 can be a plate-like structure. In some embodiments, the first layer routing 110 is a grid structure 40, and the second layer routing 120 can be a plate-like structure. In some embodiments, the first layer routing 110 is a grid structure 40, and the second layer routing 120 can be a plate-like structure, and a grid structure 40 is provided in a partial area of the plate-like structure. In some embodiments, the second layer wiring 120 is a grid structure 40 , and the first layer wiring 110 may be a plate-like structure, and a partial area of the plate-like structure is provided with the grid structure 40 .
[0036] In some embodiments, the first layer of wiring 110 is a plate-like structure, and a first grid structure 40 is provided on a partial area of the plate-like structure, and the second layer of wiring 120 is a plate-like structure, and a second grid structure 40 is provided on a partial area of the plate-like structure, wherein the orthographic projections of the multiple first grid structures 40 in the non-display area may not overlap with the orthographic projections of the multiple second grid structures 40 in the non-display area, so as to release stress and avoid stress concentration. In some other embodiments, while ensuring stable signal transmission, further stress release can make the orthographic projections of the multiple first grid structures 40 in the non-display area partially overlap with the orthographic projections of the multiple second grid structures 40 in the non-display area, so as to release more stress and avoid stress concentration. In some other embodiments, while ensuring stable signal transmission, the orthographic projections of the multiple first grid structures 40 in the non-display area and the orthographic projections of the multiple second grid structures 40 in the non-display area are further made to completely overlap, so as to better release stress.
[0037] It is understandable that the number, size and distribution density of the grid structures 40 provided on the first layer wiring 110 or the second layer wiring 120 can be set according to actual conditions, and no specific restrictions are made here. In addition, the size and number of mesh holes on each grid structure 40 can also be set according to actual conditions, and no specific restrictions are made here.
[0038] The grid structure 40 may be a hollow structure formed by connecting two inner and outer regular hexagonal vertices, or other hollow structures may be used.
[0039] Please continue reading Figure 4 , Figure 4 for Figure 1 The third structural schematic diagram of the metal wiring in the flexible display panel is shown. The mesh of the grid structure 40 can be one or a combination of rectangle, diamond, hexagon, circle, triangle.
[0040] It should be noted that the flexible display panel 100 includes a bending area. When the flexible display panel 100 is bent, the stress in the central area of the bending area is greater than the stress on the side of the bending area, and the mesh area of the grid structure 40 gradually increases from the side of the bending area to the central area. By setting the mesh area corresponding to the area with high stress to be larger than the mesh area corresponding to the area with low stress, the stress is better released by the grid structure 40 with a larger mesh area in the area with high stress, so as to avoid the metal wiring 10 from being broken due to excessive stress during bending.
[0041] It is understandable that when the flexible display panel 100 is a folding screen, the mesh area of the grid structure 40 is distributed over a larger area on the folding surface, that is, the greater the stress on the folding surface, the larger the mesh area of the grid structure 40 is distributed.
[0042] When the flexible display panel 100 is a roll-up screen, the mesh area of the grid structure 40 is distributed along the radial direction of the bending axis, that is, the greater the stress on the roll-up surface, the larger the mesh area distribution of the grid structure 40 is.
[0043] In the embodiment of the present application, the metal wiring 10 in the flexible display panel 100 is arranged as a first layer wiring 110 and a second layer wiring 120 arranged in a stacked manner, and a grid structure 40 can be arranged on at least one of the first layer wiring 110 and the second layer wiring 120 according to the distribution of stress in actual applications, and the mesh area arranged at the position with greater stress is larger, so that the stress points can be better dispersed to avoid stress concentration causing the metal wiring 10 to break. In addition, by arranging the stacked first layer wiring 110 and the second layer wiring 120, the resistance of the wiring can be reduced and the loss of the signal can be reduced.
[0044] Please continue reading Figure 5 , Figure 5 A schematic diagram of the structure of a flexible display panel provided in an embodiment of the present application. The metal trace 10 can be used to transmit one of an ESD signal, a VSS signal or a VDD signal. Among them, the metal trace 10 used to transmit the ESD signal is an electrostatic protection device 60 to prevent static electricity from damaging the signal during the process and the Cell process. The metal trace 10 used to transmit the VSS signal is the first low-potential signal line 50 of the Array Metal to ensure that the signal is consistent throughout the Panel. The metal trace 10 used to transmit the VDD signal is the second low-potential signal line 70 of the Array Metal to ensure that the signal input of the Panel is consistent.
[0045] Generally, Data lines and Gate lines that send different signals to each row and column cannot be unified into a large busline. They need to send signals one by one, and are limited by the area of the Panel, so the width of the routing line of this size ranges from 3 microns to 10 microns. Other routing lines, such as VSS, VDD or ESD, can be designed as needed to provide the metal routing line 10 provided in the embodiment of the present application. The width of the metal routing line 10 provided in the embodiment of the present application ranges from 50 microns to 2000 microns. It should be noted that the VSS, VDD or ESD routing lines are also narrow when they come in from the input end. Multiple identical signal lines are gathered into a wide busline, that is, the metal routing line 10, and then dispersed from the busline to the display area. In this way, although the routing lengths of the VSS, VDD or ESD routing lines from the input end to the busline are different, that is, although the impedances are different, they are all gathered on the wide busline line, and the potential is the same. Then they enter the display area from here, eliminating the influence of different impedances from the input end to the busline.
[0046] Please continue reading Figure 6 and Figure 7 , Figure 6 for Figure 1 A schematic diagram of a first application structure of metal routing in a flexible display panel is shown; Figure 7 for Figure 1 A schematic diagram of the second application structure of the metal routing in the flexible display panel shown. The flexible display panel 100 includes a plurality of metal routings 10. In some embodiments, the metal routing 10 for transmitting the ESD signal is a ring structure, and the ring structure includes a first side, a second side, a third side and a fourth side connected in sequence. Among them, at least one side of the first side, the second side, the third side and the fourth side is the metal routing 10 described above. The specific setting is based on the actual situation. By arranging a stacked arrangement of the metal routing 10 having the first layer routing 110 and the second layer routing 120 in a partial area of the metal routing 10 for transmitting the ESD signal, the stress effect can be eliminated in a regionalized manner, thereby ensuring the stability of the metal routing 10. In addition, by arranging the metal routing 10 for transmitting the ESD signal as the metal routing 10 provided in the embodiment of this application, the loss of the signal is reduced, and the signal can be better transmitted.
[0047] It should be noted that the shape of the metal routing 10 used to transmit the ESD signal is not limited to a ring structure, but can also be any other structure, as long as the metal routing used to transmit the ESD signal is at least partially configured as a stacked metal routing 10 with a first layer routing 110 and a second layer routing 120 provided in the embodiment of the present application.
[0048] In some embodiments, the metal routing 10 for transmitting the VSS signal is a ring structure, and the ring structure includes a first side, a second side, a third side and a fourth side connected in sequence. Among them, at least one side among the first side, the second side, the third side and the fourth side is the metal routing 10 described above. It is set according to the actual situation. By setting a stacked metal routing 10 having a first layer routing 110 and a second layer routing 120 in a partial area of the metal routing 10 that transmits the VSS signal, the stress effect can be eliminated in a regionalized manner, thereby ensuring the stability of the metal routing 10. In addition, by setting the metal routing that transmits the VSS signal as the metal routing 10 provided in the embodiment of this application, the signal loss is reduced, and the signal can be better transmitted.
[0049] It should be noted that the shape of the metal routing 10 for transmitting the VSS signal is not limited to a ring structure, but may be any other structure, as long as the metal routing for transmitting the VSS signal is at least partially configured as a stacked metal routing 10 having a first layer routing 110 and a second layer routing 120 provided in the embodiment of the present application.
[0050] In some embodiments, the metal routing wire 10 for transmitting the VDD signal is a bar structure. It should be noted that the shape of the metal routing wire 10 for transmitting the VDD signal is not limited to a bar structure, and may be any other structure, as long as the metal routing wire for transmitting the VDD signal is at least partially configured as a metal routing wire 10 having a first layer routing wire 110 and a second layer routing wire 120 provided in a stacked configuration in the embodiment of the present application.
[0051] The flexible display panel 100 also includes a surface cathode, which is located in the display area AA and the non-display area. The surface cathode is electrically connected to a metal wiring 10 located in the non-display area and used to transmit a VSS signal. Since the surface cathode needs to be set in the display area AA and the non-display area, that is, in order to provide voltage to the surface cathode, a plurality of metal wirings are required. The embodiment of the present application forms a metal wiring 10 for transmitting a VSS signal provided in the embodiment of the present application by gathering a plurality of wirings with relatively narrow widths into a busline. Since the metal wiring 10 is a stacked metal wiring 10 having a first layer wiring 110 and a second layer wiring 120, the metal wiring 10 has a wider width and a smaller resistance, which can reduce signal loss.
[0052] An embodiment of the present application further provides a flexible display device, comprising any one of the flexible display panels 100 described above.
[0053] The above is a detailed introduction to a flexible display panel and a flexible display device provided in the embodiments of the present application. Specific regulations are applied herein to explain the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.
Claims
1. A flexible display panel, characterized in that: The flexible display panel comprises: An isolation layer, wherein a plurality of vias are provided on the isolation layer; Metal routing, the metal routing comprising a first layer routing and a second layer routing, the first layer routing and the second layer routing are arranged on both sides of the isolation layer, at least one of the first layer routing and the second layer routing is provided with a grid structure, and the grid structure is provided with a plurality of meshes; A connecting wire, wherein the connecting wire is disposed in the conducting hole, the connecting wire is integrally formed with the first layer of wiring, and the connecting wire is used to connect the first layer of wiring and the second layer of wiring; The flexible display panel includes a bending zone. When the flexible display panel is in a bent state, the stress in the central area of the bending zone is greater than the stress on the side of the bending zone, and the mesh area of the grid structure gradually increases from the side of the bending zone to the central area.
2. The flexible display panel according to claim 1, characterized in that: At least a part of the first layer of wiring is provided with the grid structure, and the second layer of wiring is a block structure.
3. The flexible display panel according to claim 1, characterized in that: The first layer of wiring is the grid structure, and the second layer of wiring is a block structure.
4. The flexible display panel according to claim 1, characterized in that: A first grid structure is provided at least partially in the first layer of routing, and a second grid structure is provided at least partially in the second layer of routing. The orthographic projection of the first grid structure on the isolation layer does not overlap with the orthographic projection of the second grid structure on the isolation layer.
5. The flexible display panel according to claim 1, characterized in that: A first grid structure is provided at least partially in the first layer of routing, and a second grid structure is provided at least partially in the second layer of routing. The orthographic projection of the first grid structure on the isolation layer partially overlaps with the orthographic projection of the second grid structure on the isolation layer.
6. The flexible display panel according to claim 1, characterized in that: The metal wiring is used to transmit one of an ESD signal, a VSS signal or a VDD signal.
7. The flexible display panel according to claim 1, characterized in that: The width of the metal traces ranges from 50 microns to 2000 microns.
8. The flexible display panel according to claim 1, characterized in that: The flexible display panel includes a plurality of metal wirings, wherein the metal wiring for transmitting ESD signals is a ring structure, the metal wiring for transmitting VSS signals is a ring structure, and the metal wiring for transmitting VDD signals is a strip structure.
9. A flexible display device, characterized in that: The flexible display panel comprises the flexible display panel as described in any one of claims 1 to 8.