Composite adhesive tape and display panel

Abstract

This application discloses a composite tape, a display panel, and an electronic device. The composite tape includes an adhesive layer made of a gel. By means of the gel's shock-absorbing and cushioning properties, the composite tape of this application eliminates the need for foam, a common feature in traditional composite tapes, thus providing a significant advantage in reducing the tape's thickness. Furthermore, the gel provides strength and viscosity to the composite tape, which is beneficial for improving its mechanical strength and the adhesion strength between the tape and the component to be bonded.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a composite adhesive tape and a display panel. BACKGROUND

[0002] With the increasing demand of consumers for electronic device experience, electronic devices gradually develop towards thinness. The composite adhesive tape is a commonly used adhesive tape in electronic devices, which has excellent heat dissipation performance and buffering and shock absorption performance, and the reduction of its thickness is conducive to the thinness of electronic devices.

[0003] However, the composite adhesive tape also needs to meet high mechanical strength while reducing its thickness, and the existing composite adhesive tape is difficult to meet the requirements. SUMMARY

[0004] The technical problem solved by the present application is to provide a composite adhesive tape and a display panel, which can not set the traditional composite adhesive tape foam, thereby providing a strong condition for reducing the thickness of the composite adhesive tape.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a composite adhesive tape, comprising: an adhesive layer, the material of the adhesive layer comprising a gel.

[0006] Preferably, the gel comprises a silicone gel.

[0007] Preferably, the adhesive layer further comprises a heat dissipation material distributed in the gel; preferably, the heat dissipation material comprises carbon material; preferably, the heat dissipation material comprises at least one of graphite and carbon powder.

[0008] Preferably, the composite adhesive tape further comprises a metal layer disposed on one side of the adhesive layer, and the metal layer comprises a metal material; preferably, the metal material comprises at least one of copper, aluminum and stainless steel.

[0009] Preferably, the adhesive layer is a net structure or a hole structure.

[0010] Preferably, the thickness of the gel is 0.1-0.16mm; preferably, the thickness of the gel is 0.12-0.14mm.

[0011] Another technical solution adopted by the present application is to provide a display panel comprising the aforementioned composite adhesive tape.

[0012] The display panel comprises a screen body, the screen body comprises a first sub-screen body and a second sub-screen body connected together, the first sub-screen body is provided with a light exit surface, the second sub-screen body is bent towards a side away from the light exit surface of the first sub-screen body to form a bonding portion, and the bonding portion is located on a side of the first sub-screen body away from the light exit surface; the composite tape is located between the first sub-screen body and the bonding portion, and one side of the adhesive layer is bonded to the first sub-screen body.

[0013] The other side of the adhesive layer is bonded to the bonding portion; or the composite tape further comprises a metal layer arranged between the adhesive layer and the bonding portion and bonded to the adhesive layer; and the display panel further comprises a spacer arranged between the metal layer and the bonding portion and bonded to the metal layer and the bonding portion on both sides.

[0014] The adhesion strength between the surface of one side of the adhesive layer facing the first sub-screen body and the first sub-screen body is greater than or equal to 1000 gf / inch; and / or the display panel further comprises a support film arranged between the first sub-screen body and the composite tape, one side of the adhesive layer is bonded to the support film, and the orthographic projection of the support film on the first sub-screen body covers the orthographic projection of the adhesive layer on the first sub-screen body.

[0015] Compared with the prior art, the composite tape in the present application comprises an adhesive layer, and the material of the adhesive layer comprises a gel. Since the gel has the beneficial effect of shock absorption and buffering, the composite tape in the present application can not be provided with the traditional foam in the composite tape, thereby providing a strong condition for reducing the thickness of the composite tape. In addition, the gel can provide strength and viscosity for the composite tape, which is conducive to improving the mechanical strength of the composite tape and the adhesion strength between the composite tape and the to-be-bonded member. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0017] Figure 1 is a structural schematic diagram of an embodiment of the composite tape of the present application;

[0018] Figure 2 is a structural schematic diagram of another embodiment of the composite tape of the present application;

[0019] Figure 3is a structural schematic diagram of an embodiment of a display panel of the present application.

[0020] Figure 4 is a structural schematic diagram of another embodiment of a display panel of the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0022] Reference should be made to Figures 1-2 In an embodiment of the present application, the composite adhesive tape 1 comprises an adhesive layer 11, and the material of the adhesive layer 11 comprises a gel.

[0023] Specifically, the composite adhesive tape is a kind of adhesive tape with multiple functions such as electrically conductive, thermally conductive, light shielding, electromagnetic shielding, shock absorption and buffering, and is often used to bond and fix various structural layers in a display panel. The adhesive layer can provide adhesion for the composite adhesive tape. The gel is a special dispersion system with a spatial network structure and full of liquid as a dispersion medium in the structure pores. The traditional composite adhesive tape generally comprises a grid adhesive, foam and copper foil arranged in layers, and the adhesive layer comprises the grid adhesive and the foam. The foam can provide the effect of shock absorption and buffering for the traditional composite adhesive tape, but the traditional composite adhesive tape has many layers, and is not easy to realize ultra-thin while maintaining high strength due to the limitation of processing difficulty. In the present application, the gel is used as the adhesive layer 11. Since the gel has the beneficial effect of shock absorption and buffering, the composite adhesive tape 1 of the present application can not be provided with the foam in the traditional composite adhesive tape, thereby providing a strong condition for reducing the thickness of the composite adhesive tape 1. In addition, the gel can provide strength and viscosity for the composite adhesive tape 1, which is conducive to improving the mechanical strength of the composite adhesive tape 1 and the adhesion strength between the composite adhesive tape 1 and the to-be-bonded member.

[0024] In some application scenarios, the gel includes an organic gel, for example, a silicone gel, a polyacrylic acid gel, a polyvinyl alcohol gel, a polyoxyethylene gel, a polyurethane gel, a polyacrylamide, and the like. The organic gel has relatively large rigidity and good impact resistance, and can provide the composite adhesive tape 1 with excellent strength, rigidity, and shock absorption performance. In some embodiments, the gel includes a silicone gel. The silicone gel is a gel material made of a polysiloxane with unsaturated groups and cross-linked. The silicone gel has the characteristics of both silicon oxide and organic polymer, has a relatively regular network structure, is stable in structure and has excellent weather resistance. The use of the silicone gel can further improve the strength of the composite adhesive tape 1 and prolong the service life of the composite adhesive tape 1. In addition, the molecular weight, molecular weight distribution, and cross-linking degree of the silicone gel can be adjusted according to product requirements to control the viscosity, strength, and impact resistance of the silicone gel, so as to meet the bonding requirements between the composite adhesive tape 1 and different to-be-bonded members and improve the adaptability between the composite adhesive tape 1 and different to-be-bonded members.

[0025] In some application scenarios, the gel can also include an inorganic gel, for example, a silicon oxide gel, a titanium oxide gel, an iron oxide gel, a vanadium oxide gel, and the like. The material of the gel can be selected by the person skilled in the art according to the application scenarios of the composite adhesive tape 1.

[0026] In some application scenarios, the thickness of the gel is 0.1-0.16 mm, for example, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, or a range between any two of the above values, for example, 0.1-0.12 mm, 0.13-0.16 mm, 0.12-0.14 mm, 0.14-0.15 mm, 0.11-0.15 mm, and the like. The thickness of the gel in the above range is conducive to reducing the overall thickness of the composite adhesive tape 1. Further, the thickness of the gel in the range of 0.12-0.14 mm can reduce the thickness of the composite adhesive tape 1 while improving the strength of the composite adhesive tape 1, which is conducive to improving the overall performance of the composite adhesive tape 1.

[0027] The following takes the gel as an example to further explain the composite adhesive tape 1 in the present application. The performance test results of the examples and the comparative examples are shown in Table 1.

[0028] Table 1 Performance test results of examples and comparative examples

[0029]

[0030] For the commercially available composite tapes in the comparative examples, the adhesive layer 11 is generally composed of a layered mesh adhesive and foam. Due to the constraints of processing technology and layering structure, the thickness of the adhesive layer 11 is generally 0.16-0.19 mm. As can be seen from Table 1, compared with the commercially available composite tapes in the comparative examples, the thickness of the adhesive layer 11 in the examples is reduced by 18.75%-31.58%, while the back impact energy meets the standard, exhibiting good impact resistance and shock absorption performance. Furthermore, the cost per unit area is reduced by approximately 37.17%, resulting in a higher cost-performance ratio and better meeting market demands. In contrast, the adhesive layer 11 in the comparative examples has more layers, making the ultra-thin composite tape 1 more difficult to process compared to a single-layer gel. Furthermore, in the comparative example, the mesh adhesive layer is designed in a mesh shape. As the mesh adhesive gradually activates, it can expel small air bubbles from the bonding interface. Without this mesh design, commercially available composite tapes will leave air bubbles at the bonding interface after being applied to the workpiece, causing problems such as bulging of both the composite tape and the workpiece, and separation of the composite tape from the workpiece. For example, in one application scenario, composite tape is applied to the screen of a display panel. If air bubbles between the composite tape and the screen cannot be expelled smoothly, it will cause bulging of the screen, affecting its appearance, reducing the adhesion strength between the composite tape and the screen, resulting in poor display quality and shortening the lifespan of the display panel. Silicone gel, on the other hand, has good air expulsion properties. When applied to the screen, small air bubbles between the silicone gel and the screen easily escape on their own. Therefore, a good bonding effect can be achieved without a mesh design, reducing processing difficulty and cost, and lowering the cost per unit area.

[0031] According to some embodiments of this application, the adhesive layer 11 can also be a mesh structure or a porous structure. On the one hand, it can save the material of the adhesive layer 11 and reduce the material cost; on the other hand, the mesh structure adhesive layer 11 or the porous structure adhesive layer 11 can gradually release small air bubbles at the bonding interface during the process of being bonded to the part to be bonded, which is conducive to improving the air release of the adhesive layer 11. This can alleviate problems such as bulging of the composite tape and the part to be bonded, separation of the composite tape and the part to be bonded, and improve the bonding strength and stability between the composite tape and the part to be bonded.

[0032] According to some embodiments of this application, please refer to Figure 1The composite tape 1 further includes a metal layer 12, which is disposed on one side of the adhesive layer 11. The metal layer 12 comprises a metal material, including at least one of copper, aluminum, and stainless steel. The metal layer 12 provides support to the adhesive layer 11, improving its strength and dimensional stability, reducing peeling between the composite tape 1 and the workpiece, and enhancing the bonding stability between the composite tape 1 and the workpiece. Furthermore, the metal material provides excellent heat dissipation, electromagnetic shielding, and light-shielding properties for the composite tape 1, which is beneficial for its application in electronic devices.

[0033] Of course, the composite tape 1 may also exclude the metal layer 12.

[0034] According to some embodiments of this application, please refer to Figure 2 The adhesive layer 11 includes a heat-dissipating material 111 distributed in the gel. The heat-dissipating material 111 provides excellent heat dissipation, electromagnetic shielding, and light-shielding properties for the composite tape 1, which is beneficial for its application in electronic devices. The heat-dissipating material 111 can replace the aforementioned metal layer 12, further reducing the number of adhesive layer stacks and the thickness of the composite tape 1. In some embodiments, the heat-dissipating material 111 includes carbon materials, such as graphite or carbon powder. Carbon materials provide excellent strength, thermal conductivity, and weather resistance for the composite tape 1. While possessing high strength, they also have low density, reducing the weight of the composite tape 1 and facilitating the lightweighting of the components to be bonded, better meeting consumer demands. Furthermore, carbon materials are generally black, making it easy to achieve a light-shielding effect by controlling their distribution in the gel, thus providing good light-shielding performance for the composite tape 1. In some embodiments, the composite tape 1 may simultaneously include a metal layer 12 and a heat-dissipating material 111.

[0035] Please refer to Figures 3-4 In one embodiment of this application, the display panel 100 includes the aforementioned composite tape 1. The display panel 100 can be any type of display panel, such as a flexible OLED (Organic Light-Emitting Diode) display panel, a curved OLED display panel, an LCD (Liquid Crystal Display) display panel, or a Micro-LED display panel, etc.

[0036] According to some embodiments of this application, please refer to Figures 3-4 The display panel 100 also includes a screen body 2.

[0037] The screen 2 includes a first sub-screen 21 and a second sub-screen 22 connected together. The first sub-screen 21 has a light-emitting surface a1. The second sub-screen 22 is bent toward the side opposite to the light-emitting surface a1 of the first sub-screen 21 to form a bonding portion 221. The bonding portion 221 is located on the side of the first sub-screen 21 opposite to the light-emitting surface a1. A composite tape 1 is located between the first sub-screen 21 and the bonding portion 221, and one surface a2 of the adhesive layer 11 is bonded to the first sub-screen 21. The gel provides excellent cushioning and shock absorption performance for the composite tape 1. Therefore, attaching the composite tape 1 between the first sub-screen 21 and the bonding portion 221 can protect the screen 2, converting external point forces on the screen 2 into surface forces, reducing localized damage to the screen 2 during the manufacturing and use of the display panel 100, and improving product yield. The composite tape 1 has excellent light-shielding properties, which helps improve the light emission quality on the light-emitting surface a1 side of the first sub-screen 21. In addition, the composite tape 1 can also play a role in heat dissipation and electromagnetic shielding, reducing local heat accumulation inside the display panel 100 and electromagnetic interference between internal components, thus extending the service life of the display panel 100.

[0038] According to other embodiments of this application, please refer to Figure 3 When the composite tape 1 further includes a metal layer 12, the metal layer 12 is disposed between the adhesive layer 11 and the bonding portion 221 and is bonded to the adhesive layer 11. At this time, the display panel 100 further includes a shim 3, disposed between the metal layer 12 and the bonding portion 221, and bonded to the metal layer 12 and the bonding portion 221 on both sides respectively. The shim 3 is used to fix the first sub-screen 21 and the bent second sub-screen 22, filling the gap. When the surface a3 of the metal layer 12 facing away from the first sub-screen 21 is not adhesive, the metal layer 12 can be bonded to the bonding portion 221 through the shim 3.

[0039] According to some embodiments of this application, the adhesive strength between the surface a2 of the adhesive layer 11 facing the first sub-screen 21 and the first sub-screen 21 is greater than or equal to 1000 gf / inch. For example, adhesive strengths of 1000 gf / inch, 1100 gf / inch, 1200 gf / inch, 1300 gf / inch, 1400 gf / inch, 1500 gf / inch, 1800 gf / inch, 2000 gf / inch, 3000 gf / inch, 4000 gf / inch, and 5000 gf / inch are possible. An adhesive strength between the gel and the first sub-screen 21 within the above range can improve the bonding stability between the composite tape 1 and the first sub-screen 21, and reduce separation between the composite tape 1 and the part to be bonded.

[0040] According to some embodiments of this application, please refer to Figure 4The adhesive layer 11 includes a heat-dissipating material 111 distributed in the gel, and the other side a4 of the adhesive layer 11 is bonded to the bonding portion 221. In this embodiment, both opposite surfaces of the adhesive layer 11 are adhesive, without the use of the shim 3 (see reference). Figure 3 In some embodiments, the adhesive layer 11 has an adhesion strength greater than or equal to 1000 gf / inch between its surface a2 facing the first sub-screen 21 and the first sub-screen 21, and the adhesive layer 11 has an adhesion strength greater than or equal to 1000 gf / inch between its surface a4 facing the bonding portion 221 and the bonding portion 221, further improving the bonding stability between the composite tape 1 and the screen 2.

[0041] According to some embodiments of this application, the display panel 100 further includes a support film 4, which is disposed between the first sub-screen 21 and the composite tape 1. One side of the adhesive layer 11 is bonded to the support film 4, and the orthographic projection of the support film 4 on the first sub-screen 21 covers the orthographic projection of the adhesive layer 11 on the first sub-screen 21. The support film 4 is used to support, reinforce, and protect the first sub-screen 21, reducing bending and warping of the first sub-screen 21. The adhesive layer 11 being located within the range of the support film 4 can reduce adhesive overflow during application and use, and reduce damage to other structural layers and devices in the display panel 100 caused by overflowing adhesive layer 11.

[0042] This application also relates to an electronic device, including the aforementioned display panel 100. The display device of the electronic device includes, but is not limited to, any product or component with display function such as a liquid crystal panel, electronic paper, OLED panel, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, and navigator. Accordingly, this electronic device also has the same technical effects as the aforementioned display panel 100, which will not be elaborated further here.

[0043] As described above, this invention provides a composite tape, a display panel, and an electronic device. The composite tape includes an adhesive layer, the material of which is a gel. By using a gel instead of the traditional double-layer structure of foam and mesh adhesive in composite tapes, the thickness of the composite tape can be reduced. The gel provides strength and viscosity to the composite tape, which helps improve its mechanical strength and the adhesion strength between the composite tape and the component to be bonded. Applying this composite tape to a display panel can also reduce the thickness of the display panel and extend its lifespan.

[0044] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A display panel, characterized by, The composite adhesive tape comprises an adhesive layer and a metal layer arranged on one side of the adhesive layer and bonded with the adhesive layer, the material of the adhesive layer comprises a gel, the metal layer comprises a metal material, and the adhesive layer is in a mesh structure or a hole structure, so as to save material and discharge bubbles in the bonding interface. The screen body comprises a first sub-screen body and a second sub-screen body connected, the first sub-screen body is provided with a light-out surface, the second sub-screen body is bent towards a side away from the light-out surface of the first sub-screen body to form a bonding part, the bonding part is located on a side of the first sub-screen body away from the light-out surface, and the metal layer is arranged between the adhesive layer and the bonding part. The composite adhesive tape is located between the first sub-screen body and the bonding part, and one side of the adhesive layer is bonded with the first sub-screen body.

2. The display panel according to claim 1, further comprising: a pad block arranged between the metal layer and the bonding part and bonded with the metal layer and the bonding part on both sides.

3. The display panel according to claim 1, wherein: the adhesion strength between the surface of one side of the adhesive layer facing the first sub-screen body and the first sub-screen body is greater than or equal to 1000 gf / inch; and / or the display panel further comprises a support film arranged between the first sub-screen body and the composite adhesive tape, one side of the adhesive layer is bonded with the support film, and the orthographic projection of the support film on the first sub-screen body covers the orthographic projection of the adhesive layer on the first sub-screen body. The gel comprises an organic gel. The gel comprises a silicone gel. The adhesive layer further comprises a heat dissipation material distributed in the gel.

4. The display panel of claim 1, wherein, The heat dissipation material comprises a carbon material.

5. The display panel of claim 4, wherein, 8. The display panel according to claim 7, wherein:

6. The display panel of claim 1, wherein, the heat dissipation material comprises at least one of graphite and carbon powder.

7. The display panel of claim 6, wherein, The metal material comprises at least one of metal copper, metal aluminum and stainless steel. The thickness of the gel is 0.1-0.16 mm. The thickness of the gel is 0.12-0.14 mm.

9. The display panel of claim 1, wherein, ​ 10. The display panel of claim 1, wherein, ​ 11. The display panel of claim 10, wherein, ​

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