Supporting film and display module
By introducing an antistatic layer and an insulating adhesive layer into the support film, the problem of static electricity conduction is solved, achieving excellent antistatic effect and support of the support film, and extending the service life of the display module.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-03-03
AI Technical Summary
The existing support film lacks anti-static properties, which makes it easy for static electricity to be conducted to the adhesive surface and damage the circuit board, affecting the service life of the display module.
An antistatic layer and an insulating adhesive layer are introduced into the support membrane, which, together with other structural layers in the application layer, forms an excellent antistatic effect and prevents static electricity conduction.
It effectively suppresses static electricity generation, prevents static electricity from being conducted to the circuit board, and extends the service life of the display module.
Smart Images
Figure CN223968171U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and more specifically, to a support film and a display module. Background Technology
[0002] OLED (Organic Light-Emitting Diode) displays are prone to deformation due to the thin flexible substrate of their flexible screen. Therefore, a support film needs to be attached to the non-display side of the flexible screen to provide support.
[0003] However, existing support films lack antistatic properties or have poor antistatic effects, making it easy for static electricity to be conducted to the adhesive surface during the use of mobile phones and other digital products, thereby damaging the circuit board bonded to the adhesive surface and affecting the product's lifespan. Utility Model Content
[0004] To address the aforementioned technical problems, the purpose of this application is to provide a support film and a display module. The support film has excellent antistatic properties and support, which can effectively extend the service life of the display module.
[0005] In a first aspect, embodiments of this application provide a support film for supporting a display screen body. The support film includes a working layer, which comprises a first pressure-sensitive adhesive layer, an insulating adhesive layer, a first base film layer, and an antistatic layer sequentially stacked along the thickness direction. The support film is bonded to the non-display surface of the display screen body through the first pressure-sensitive adhesive layer.
[0006] In the above technical solution, by adding an antistatic layer in the working layer, the generation of static charge can be suppressed and reduced. By further adding an insulating adhesive layer, static electricity can be prevented from being conducted to the first pressure-sensitive adhesive layer, thereby breaking through the circuit board that is bonded to the adhesive surface of the first pressure-sensitive adhesive layer. This allows the support film to effectively extend the service life of the display module.
[0007] In one possible implementation, the surface impedance of the antistatic layer is e. 4 -e 9 The antistatic layer is made of an antistatic agent and has a thickness of 20-50 nm. Its small thickness and low surface resistance allow for good antistatic performance.
[0008] In one possible implementation, the surface impedance of the insulating adhesive layer is greater than e. 14 The insulating layer (Ω) is formed by curing optical pressure-sensitive adhesive, and its thickness is 10-50 μm. The insulating layer has a large thickness and high surface resistance, which effectively prevents electrostatic conduction.
[0009] In one possible implementation, the use layer further includes a second base film layer located between the first pressure-sensitive adhesive layer and the insulating adhesive layer; and / or, the use layer further includes an insulating coating located between the first base film layer and the insulating adhesive layer.
[0010] In the above technical solution, the application layer may further include a second base film layer and / or an insulating coating. The second base film layer is disposed between the first pressure-sensitive adhesive layer and the insulating adhesive layer, which can further prevent static electricity conduction to the adhesive surface of the first pressure-sensitive adhesive layer and further increase the support. The insulating coating is disposed between the first base film layer and the insulating adhesive layer, which can further prevent static electricity conduction and increase the antistatic effect.
[0011] In one possible implementation, the thickness of the second base film layer is 25-80 μm, and the material of the second base film layer is at least one of PET, PMMA or PC; and / or, the material of the insulating coating includes at least one of silicon oxide or silicon nitride, and the thickness of the insulating coating is 20-150 nm.
[0012] In the above technical solution, by further controlling the material and thickness of the second base film layer and / or insulating coating, the antistatic effect and support of the support film can be further improved.
[0013] In one possible implementation, the thickness of the first base film layer is 25-80 μm, and the material of the first base film layer is at least one of PET, PMMA or PC; and / or, the thickness of the first pressure-sensitive adhesive layer is 10-35 μm, and the material of the first pressure-sensitive adhesive layer is one of acrylic adhesive, silicone or PU adhesive.
[0014] In one possible implementation, the support film further includes a protective layer comprising a stacked third base film layer and a second pressure-sensitive adhesive layer, with the second pressure-sensitive adhesive layer located between the third base film layer and the antistatic layer. The protective layer serves to protect the service layer, reducing surface contamination, scratches, defects, and other imperfections.
[0015] In one possible implementation, the viscosity of the first pressure-sensitive adhesive layer is greater than the viscosity of the second pressure-sensitive adhesive layer; and / or, the thickness of the second pressure-sensitive adhesive layer is 5-15 μm, and the material of the second pressure-sensitive adhesive layer is one of acrylic adhesive, silicone adhesive or PU adhesive.
[0016] In one possible implementation, the support film further includes a release layer located on the surface of the first pressure-sensitive adhesive layer opposite to the insulating adhesive layer. The release layer has a thickness of 25-80 μm and is one of a silicon-based release film, a fluorine-based release film, or a non-silicone release film. The release layer protects the first pressure-sensitive adhesive layer and prevents defects such as adhesive overflow, dirt, and scratches from occurring.
[0017] Secondly, embodiments of this application provide a display module, including a display screen body and the aforementioned support film attached to the non-display surface of the display screen body.
[0018] In the above technical solution, because the support film has excellent antistatic function and support, it can reduce the impact of static electricity on the internal components of the display module, thereby enabling the display module to have a longer service life. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A schematic diagram of a support membrane structure provided for the prior art;
[0021] Figure 2 This is a schematic diagram of the structure of a support membrane provided in one embodiment of this application;
[0022] Figure 3 This is a schematic diagram of another support membrane structure provided in an embodiment of this application;
[0023] Figure 4 This is a schematic diagram of another support membrane structure provided in an embodiment of this application;
[0024] Figure 5 This is a schematic diagram of another support membrane structure provided in an embodiment of this application.
[0025] Explanation of icon numbers:
[0026] Support film - 100a, 100, 200, 300, 400; Release layer - 10, 10a; Service layer - 20, 20a; First pressure-sensitive adhesive layer - 21, 21a; Insulating adhesive layer - 22; First base film layer - 23, 23a; Antistatic layer - 24; Second base film layer - 25; Insulating coating - 26; Protective layer - 30, 30a; Second pressure-sensitive adhesive layer - 32, 32a; Third base film layer - 34, 34a; Thickness direction - L. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0028] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a support film 100a in the prior art. The support film 100a includes a release layer 10a, a service layer 20a and a protective layer 30a stacked sequentially along the thickness direction L. The service layer 20a includes a first base film layer 23a and a first pressure-sensitive adhesive layer 21a stacked together, and the protective layer 30a includes a second pressure-sensitive adhesive layer 32a and a third base film layer 34a stacked together.
[0031] In the existing support film structure, the layer 20a only includes the first base film layer 23a and the first pressure-sensitive adhesive layer 21a, and does not have an antistatic function. This makes it easy for mobile phones and other digital products to generate static electricity during use, which is conducted to the adhesive surface and thus breaks through the circuit board bonded to the adhesive surface, affecting the service life of the product.
[0032] Based on this, this application provides a support film for supporting the display screen. By adding an antistatic layer to the service layer, the generation of static charge can be suppressed and reduced. By further providing an insulating adhesive layer in the service layer, static electricity can be prevented from being conducted to the first pressure-sensitive adhesive layer and damaging the circuit board bonded to the adhesive surface of the first pressure-sensitive adhesive layer. The combination of the antistatic layer and the insulating adhesive layer gives the support film excellent antistatic effect and support, which can effectively extend the service life of the display module.
[0033] The structure of the support membrane according to the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0034] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the support film 100 provided in the first embodiment of this application. The support film 100 includes a release layer 10, a service layer 20, and a protective layer 30 stacked sequentially along the thickness direction L. The service layer 20 includes a first pressure-sensitive adhesive layer 21, an insulating adhesive layer 22, a first base film layer 23, and an antistatic layer 24 stacked sequentially along the thickness direction L. The support film 100 is bonded to the non-display surface of the display screen body through the first pressure-sensitive adhesive layer 21.
[0035] Release layer 10 is a silicon-based release film, a fluorine-based release film, or a non-silicon release film. The thickness of release layer 10 is 25-80 μm; for example, the thickness of release layer 10 can be 25 μm, 35 μm, 50 μm, 80 μm, etc. Release layer 10 can protect the first pressure-sensitive adhesive layer 21 and prevent defects such as adhesive overflow, dirt, and scratches.
[0036] The first pressure-sensitive adhesive layer 21 is made of one of acrylic adhesive, silicone adhesive, or PU adhesive. The thickness of the first pressure-sensitive adhesive layer 21 is 10-35μm. For example, the thickness of the first pressure-sensitive adhesive layer 21 can be 10μm, 25μm, 35μm, etc. The first pressure-sensitive adhesive layer 21 has high viscosity and is used for bonding to the non-display surface of the display screen.
[0037] The surface impedance of insulating layer 22 is greater than e 14 Ω. As an example, the surface impedance of the insulating adhesive layer 22 can be e. 15 Ω, e 16 Ω, etc. The insulating adhesive layer 22 does not contain conductive particles or any conductive agents. Optionally, the insulating adhesive layer 22 is formed by curing an optical pressure-sensitive adhesive. For example, the insulating adhesive layer can be a pressure-sensitive adhesive including epoxy resin or acrylic adhesive, and may also include curing agents, toughening agents, etc.
[0038] The thickness of the insulating adhesive layer 22 is 10-50 μm. For example, the thickness of the insulating adhesive layer 22 can be 10 μm, 20 μm, 50 μm, etc. The insulating adhesive layer 22 has a large thickness and high surface resistance, which can effectively prevent electrostatic conduction.
[0039] The first base film layer 23 is made of materials such as PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), or PC (polycarbonate). The thickness of the first base film layer 23 is 25-80 μm. As an example, the thickness of the first base film layer 23 can be 25 μm, 35 μm, 50 μm, 80 μm, etc. The first base film layer 23 has insulating properties and a relatively large thickness, which can provide support and protection for the display screen.
[0040] The surface impedance of the antistatic layer 24 is e 4 -e 9 Ω. As an example, the surface impedance of the antistatic layer 24 can be e. 4 Ω, e 5 Ω, e 6 Ω, e 7 Ω, e 8 Ω, e 9The antistatic layer 24 is made of an antistatic agent. For example, the antistatic agent may be lithium bis(trifluoromethanesulfonyl)imide (LiTFSi). The thickness of the antistatic layer is 20-50 nm. For example, the thickness of the antistatic layer 24 may be 20 nm, 30 nm, 50 nm, etc. Because the antistatic layer 24 is relatively far from the display body, it has a good antistatic effect and can effectively prevent static electricity from affecting the internal electronic components of the display module.
[0041] In some embodiments, the protective layer 30 includes a third base film layer 34 and a second pressure-sensitive adhesive layer 32 stacked together, with the second pressure-sensitive adhesive layer 32 disposed between the third base film layer 34 and the antistatic layer 24. The protective layer 30 can protect the service layer 20 to reduce defects such as dirt, scratches, and pinholes on the surface of the service layer 20.
[0042] The second pressure-sensitive adhesive layer 32 can be made of acrylic adhesive, silicone, or PU adhesive. The viscosity of the second pressure-sensitive adhesive layer 32 can be lower than that of the first pressure-sensitive adhesive layer 21. The thickness of the second pressure-sensitive adhesive layer 32 is 5-15 μm. As an example, the thickness of the second pressure-sensitive adhesive layer 32 can be 5 μm, 10 μm, 15 μm, etc.
[0043] The third base film layer 34 is made of materials such as PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), or PC (polycarbonate). The thickness of the third base film layer 34 is 25-80 μm. As an example, the thickness of the third base film layer 34 can be 25 μm, 35 μm, 50 μm, 80 μm, etc.
[0044] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the support film 200 provided in the second embodiment of this application. The structure of the support film 200 is generally the same as that of the support film 100 described above, except that the service layer 20 of the support film 200 further includes a second base film layer 25. The second base film layer 25 is located between the first pressure-sensitive adhesive layer 21 and the insulating adhesive layer 22, which can further prevent static electricity from being conducted to the adhesive surface of the first pressure-sensitive adhesive layer 21 and further increase the support.
[0045] The second base film layer 25 is made of materials such as PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), or PC (polycarbonate). The thickness of the second base film layer 25 is 25-80 μm. As an example, the thickness of the second base film layer 25 can be 25 μm, 35 μm, 50 μm, 80 μm, etc.
[0046] Please see Figure 4 , Figure 4This is a schematic diagram of the structure of the support film 300 provided in the third embodiment of this application. The structure of the support film 300 is generally the same as that of the support film 100 described above, except that the service layer 20 of the support film 300 further includes an insulating coating 26, which is located between the first base film layer 23 and the insulating adhesive layer 22, and can further improve the antistatic effect.
[0047] The insulating coating 26 may include at least one of silicon oxide or silicon nitride. The thickness of the insulating coating 26 is 20-150 nm. As an example, the thickness of the insulating coating 26 may be 20 nm, 50 nm, 100 nm, 150 nm, etc.
[0048] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the support film 400 provided in the fourth embodiment of this application. The structure of the support film 400 is generally the same as that of the support film 100 described above, except that the service layer 20 of the support film 400 further includes a second base film layer 25 and an insulating coating layer 26. The second base film layer 25 is located between the first pressure-sensitive adhesive layer 21 and the insulating adhesive layer 22, and the insulating coating layer 26 is located between the first base film layer 23 and the insulating adhesive layer 22, thereby simultaneously improving the antistatic effect and the support.
[0049] In addition, this application embodiment also provides a display module, including a display screen body and the aforementioned support film attached to the non-display surface of the display screen body.
[0050] Understandably, in actual use, it is necessary to remove the release layer to expose the first pressure-sensitive adhesive layer, and then attach the support film to the non-display surface of the display screen.
[0051] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A support film for supporting a display screen body, characterized by, The use layer comprises a first pressure-sensitive adhesive layer, an insulating adhesive layer, a first base film layer and an antistatic layer stacked in sequence along the thickness direction, and the support film is attached to the non-display surface of the display screen body through the first pressure-sensitive adhesive layer. The material of the anti-static layer is lithium bis-trifluoromethanesulfonimide, the thickness of the anti-static layer is 20-50 nm, and the surface impedance of the anti-static layer is e 4 - e 9 Ω.
2. The support film according to claim 1, characterized in that The surface impedance of the insulating adhesive layer is greater than e 14 Ω; The insulating adhesive layer is formed by curing optical pressure-sensitive adhesive, and the thickness of the insulating adhesive layer is 10-50 μm.
3. The support film of claim 1, wherein The use layer further comprises a second base film layer between the first pressure-sensitive adhesive layer and the insulating adhesive layer. The use layer further comprises an insulating coating layer between the first base film layer and the insulating adhesive layer.
4. The support film according to claim 3, characterized in that The thickness of the second base film layer is 25-80 μm, and the material of the second base film layer is one of PET, PMMA or PC. The thickness of the insulating coating layer is 20-150 nm, and the material of the insulating coating layer comprises one of silicon oxide or silicon nitride.
5. The support film according to claim 1, characterized in that The thickness of the first base film layer is 25-80 μm, and the material of the first base film layer is one of PET, PMMA or PC. The thickness of the first pressure-sensitive adhesive layer is 10-35 μm, and the material of the first pressure-sensitive adhesive layer is one of acrylic adhesive, silicone adhesive or PU adhesive.
6. The support film according to any one of claims 1 to 5, characterized in that, The support film further comprises a protective layer comprising a third base film layer and a second pressure-sensitive adhesive layer stacked in sequence, and the second pressure-sensitive adhesive layer is between the third base film layer and the antistatic layer.
7. The support film of claim 6, wherein The viscosity of the first pressure-sensitive adhesive layer is greater than that of the second pressure-sensitive adhesive layer. The thickness of the second pressure-sensitive adhesive layer is 5-15 μm, and the material of the second pressure-sensitive adhesive layer is one of acrylic adhesive, silicone adhesive or PU adhesive.
8. The support film according to any one of claims 1 to 5, characterized in that, The support film further comprises a release layer on the surface of the first pressure-sensitive adhesive layer away from the insulating adhesive layer. The thickness of the release layer is 25-80 μm, and the release layer is one of silicon-based release film, fluorine-based release film or non-silicon release film.
9. A display module, characterized by The support film is the support film according to any one of claims 1-8.