Flexible display panel

Abstract

The utility model discloses a kind of flexible display panels, including display area and the outer pin bonding area of the display area one side;Outer pin bonding area includes the first organic layer, inorganic layer, second organic layer, multiple metal traces, third organic layer and protective layer being set successively in layers, wherein, the surface of the protective layer covers the third organic layer, the side of the first organic layer / the inorganic layer / the second organic layer and the surface of the both ends of the first organic layer.The first organic layer of the outer pin bonding area of the flexible display panel of the utility model protrudes on its second organic layer, inorganic layer and third organic layer, so that the surface of protective layer covers third organic layer, the side of first organic layer / inorganic layer / second organic layer and the surface of the both ends of first organic layer, significantly enhanced the water-oxygen erosion resistance of metal trace, simultaneously, the edge peeling resistance of outer pin bonding area is enhanced, to improve the overall performance of flexible display panel.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and more specifically, to a flexible display panel. Background Technology

[0002] With the continuous development of display technology, flexible display technology has received increasing attention. Compared with conventional displays, flexible displays are bendable and flexible, improving the portability of display devices and reducing the probability of damage.

[0003] The outer lead bonding (OLB) area of ​​a flexible display typically comprises six layers stacked sequentially: a first organic layer, an inorganic layer, a second organic layer, a metal trace layer, a third organic layer, and a UV protective adhesive layer. The first organic layer, inorganic layer, and second organic layer form a flexible substrate, preventing the intrusion of water and oxygen from the bottom and corroding the metal traces underneath. The UV protective adhesive layer enhances the overall strength of the outer lead bonding bending area, preventing the intrusion of water and oxygen from the top and corroding the underlying metal traces. The problems with existing technology are: 1. The interface between the second and third organic layers has poor water and oxygen barrier capabilities, allowing water and oxygen to intrude through the interface and cause corrosion of the metal traces; 2. After bending, the interface between the second and third organic layers is most prone to peeling during the stress release process, increasing the rate of water and oxygen intrusion.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of this utility model is to provide a flexible display panel. The metal traces in the outer pin bonding area of ​​the flexible display panel have significantly enhanced resistance to water and oxygen corrosion, and the edge anti-peeling ability is also enhanced, thereby improving the overall performance of the display panel.

[0006] This utility model provides a flexible display panel, including a display area and an external pin bonding area located on one side of the display area;

[0007] The external pin bonding area includes a first organic layer, an inorganic layer, a second organic layer, multiple metal traces on the side of the second organic layer opposite to the inorganic layer, a third organic layer covering the multiple metal traces, and a protective layer, which are stacked sequentially.

[0008] The protective layer covers the surface of the third organic layer, the sides of the first organic layer / the inorganic layer / the second organic layer, and the surfaces of both ends of the first organic layer.

[0009] According to some examples of this utility model, the protective layer is a UV adhesive layer.

[0010] According to some examples of this utility model, the edges of the inorganic layer, the second organic layer and the third organic layer are all recessed inward relative to the edge of the first organic layer, and the inward recess distance is L1.

[0011] The distance between one edge of the multiple metal traces and the same edge of the third organic layer is L2, and the inward distance L1 is greater than the distance L2.

[0012] According to some examples of this utility model, the edges of the inorganic layer, the second organic layer, and the third organic layer are all recessed inward relative to the edge of the first organic layer by a recess distance of L1, which is greater than or equal to 800 μm.

[0013] According to some examples of the present invention, the first organic layer is one or more of the following: polyethylene terephthalate film layer, polyethylene naphthalate film layer, polycarbonate film layer, polyimide film layer, polyethylene sulfonate film layer, polyoxymethylene film layer, polyarylate film layer, hexamethyldisiloxane film layer, and acrylamide resin film layer.

[0014] According to some examples of this utility model, the inorganic layer is one or any combination of silicon nitride layer, silicon oxynitride layer, silicon oxide layer, aluminum oxide layer, and titanium dioxide layer.

[0015] According to some examples of the present invention, the second organic layer is one or more of the following: polyethylene terephthalate film layer, polyethylene naphthalate film layer, polycarbonate film layer, polyimide film layer, polyethylene sulfonate film layer, polyoxymethylene film layer, polyarylate film layer, hexamethyldisiloxane film layer, and acrylamide resin film layer.

[0016] According to some examples of this invention, the third organic layer is a polyimide layer, an acrylic layer, or a polycarbonate layer.

[0017] In this invention, the first organic layer of the outer pin bonding area of ​​the flexible display panel protrudes from the second organic layer, the inorganic layer, and the third organic layer thereon. Thus, the protective layer covers the surface of the third organic layer, the sides of the first organic layer / inorganic layer / second organic layer, and the surfaces of both ends of the first organic layer, significantly enhancing the resistance of the metal traces to water and oxygen corrosion. At the same time, the edge anti-peeling ability of the outer pin bonding area is enhanced, thereby improving the overall performance of the flexible display panel. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. Furthermore, the drawings are merely illustrative diagrams of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0019] Figure 1 This is a schematic diagram of the structure of a flexible display panel according to an embodiment of the present invention; and

[0020] Figure 2 This is a cross-sectional structural diagram of the outer pin bonding area of ​​a flexible display panel according to an embodiment of the present invention. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] In this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this specification, as well as the features of different embodiments or examples.

[0023] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Terms indicating relative space, such as "below" and "above," are used to more easily explain the relationship of one device relative to another illustrated in the figures. These terms refer not only to their meaning in the figures but also to other meanings or operations of the device in use. For example, if the device in the figures is rotated, a device previously described as "below" another device may now be described as "above" another device. Therefore, the exemplary term "below" encompasses both above and below. The device may be rotated 90° or other angles, and the terms representing relative space are interpreted accordingly.

[0024] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0025] Although not fully defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this specification pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0026] To address the existing technical problems, this utility model discloses a flexible display panel, which includes a display area and an external pin bonding area located on one side of the display area. The external pin bonding area includes a first organic layer, an inorganic layer, a second organic layer, multiple metal traces on the side of the second organic layer opposite to the inorganic layer, a third organic layer covering the multiple metal traces, and a protective layer, wherein the protective layer covers the surface of the third organic layer, the side surfaces of the first organic layer / the inorganic layer / the second organic layer, and the surfaces of both ends of the first organic layer.

[0027] In this invention, the first organic layer of the outer pin bonding area of ​​the flexible display panel protrudes from the second organic layer, the inorganic layer, and the third organic layer thereon. Thus, the protective layer covers the surface of the third organic layer, the sides of the first organic layer / inorganic layer / second organic layer, and the surfaces of both ends of the first organic layer, significantly enhancing the resistance of the metal traces to water and oxygen corrosion. At the same time, the edge anti-peeling ability of the outer pin bonding area is enhanced, thereby improving the overall performance of the flexible display panel.

[0028] The structure of the flexible display panel of this utility model is further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model.

[0029] Figure 1 This is a schematic diagram of the structure of a flexible display panel according to an embodiment of the present invention. Specifically, the flexible display panel includes a display area 1 and an external pin bonding area 2 located on one side of the display area 1. The external pin bonding area 2 can be regarded as an extension end of the substrate, and the external pin bonding area 2 can be bent along a center line O. Figure 2 This is a cross-sectional structural diagram of the outer pin bonding area of ​​a flexible display panel according to an embodiment of the present invention. The outer pin bonding area 2 includes a first organic layer 21, an inorganic layer 22, a second organic layer 23, multiple metal traces 24 on the side of the second organic layer 23 facing away from the inorganic layer 22, a third organic layer 25 covering the multiple metal traces, and a protective layer 26, which are stacked sequentially. The metal traces 24 connect to the control display circuit and the driver chip of the flexible panel. The protective layer 26 covers the surface of the third organic layer 25, the sides of the first organic layer 21 / the inorganic layer 22 / the second organic layer 23, and the surfaces of both ends of the first organic layer 21.

[0030] The first organic layer 21 can be one or more layers selected from polyethylene terephthalate (PET), polyethylene naphthalate (PET), polycarbonate, polyimide, sulfonated polyethylene, polyoxymethylene (POM), polyaryl ester, hexamethyl disiloxane, and acrylamide resin. The inorganic layer 22 can be one or any combination of silicon nitride, silicon oxynitride, silicon oxide, aluminum oxide, and titanium dioxide. The second organic layer 23 can be one or more layers selected from polyethylene terephthalate (PET), polyethylene naphthalate (PET), polycarbonate, polyimide, sulfonated polyethylene, POM, polyaryl ester, hexamethyl disiloxane, and acrylamide resin. The first organic layer 21, inorganic layer 22, and second organic layer 23 can be considered as the substrate of the outer lead bonding region.

[0031] The third organic layer is an organic insulating layer, which can be a polyimide layer, an acrylic layer, or a polycarbonate layer.

[0032] The first organic layer 21, the second organic layer 23, and the third organic layer 25 can all be obtained using a coating process. The inorganic layer 22 can be obtained using a chemical vapor deposition (CVD) process. The thicknesses of the first organic layer 21, the inorganic layer 22, the second organic layer 23, and the third organic layer 25 can be determined specifically based on the desired structure and performance of the display panel. No limitations are imposed here. Multiple metal traces 24 can be obtained using a physical vapor deposition (PVD) process, and the thickness and width of a single metal trace can also be set according to the desired structure and performance of the display panel.

[0033] The protective layer is a UV adhesive layer, which can be obtained by applying and curing the adhesive using a UV coating machine. UV adhesive has the advantages of fast curing, high bonding strength, and strong weather resistance. It can effectively prevent water and oxygen from entering from the third organic layer 25 and from the sides of the first organic layer 21 / the inorganic layer 22 / the second organic layer 23, thereby preventing corrosion of the metal trace 24.

[0034] Furthermore, to improve the lifespan of the metal traces 24, in some embodiments, the edges of the inorganic layer, the second organic layer, and the third organic layer are all recessed inward relative to the edge of the first organic layer, so that the protective layer is in complete contact with the first organic layer. The recessed distance is L1, preferably greater than or equal to 800 μm, such as 1000 μm. In other embodiments, the distance between one edge of the multiple metal traces and that edge of the third organic layer is L2, and the recessed distance L1 is greater than the distance L2. In this case, the intrusion path of water and oxygen at the edge of the outer lead bonding area becomes longer, and the time for water and oxygen to invade and corrode the metal traces is extended, thereby significantly enhancing the water and oxygen resistance of the outer lead bonding area. At the same time, the peel resistance of the edge of the outer lead bonding area after bending is also enhanced.

[0035] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. It will be apparent to those skilled in the art that this application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A flexible display panel, characterized in that, Includes a display area and an external pin bonding area located on one side of the display area; The external pin bonding area includes a first organic layer, an inorganic layer, a second organic layer, multiple metal traces on the side of the second organic layer opposite to the inorganic layer, a third organic layer covering the multiple metal traces, and a protective layer, which are stacked sequentially. The protective layer covers the surface of the third organic layer, the sides of the first organic layer / the inorganic layer / the second organic layer, and the surfaces of both ends of the first organic layer.

2. The flexible display panel of claim 1, wherein, The protective layer is a UV adhesive layer.

3. The flexible display panel of claim 1, wherein, The edges of the inorganic layer, the second organic layer, and the third organic layer are all recessed inward relative to the edge of the first organic layer, with a recess distance of L1. The distance between one edge of the multiple metal traces and the same edge of the third organic layer is L2, and the inward distance L1 is greater than the distance L2.

4. The flexible display panel of claim 1, wherein, The edges of the inorganic layer, the second organic layer, and the third organic layer are all recessed inward relative to the edge of the first organic layer by a recess distance of L1, which is greater than or equal to 800 μm.

5. The flexible display panel of claim 1, wherein, The first organic layer is one or more of the following: polyethylene terephthalate film layer, polyethylene naphthalate film layer, polycarbonate film layer, polyimide film layer, polyethylene sulfonate film layer, polyoxymethylene film layer, polyarylate film layer, hexamethyldisiloxane film layer, and acrylamide resin film layer.

6. The flexible display panel of claim 1, wherein, The inorganic layer is one or any combination of silicon nitride, silicon oxynitride, silicon oxide, aluminum oxide, and titanium dioxide.

7. The flexible display panel of claim 1, wherein, The second organic layer is one or more of the following: polyethylene terephthalate film layer, polyethylene naphthalate film layer, polycarbonate film layer, polyimide film layer, polyethylene sulfonate film layer, polyoxymethylene film layer, polyarylate film layer, hexamethyldisiloxane film layer, and acrylamide resin film layer. 8.The flexible display panel of claim 1, wherein, The third organic layer is a polyimide layer, an acrylic layer, or a polycarbonate layer.

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