Multi-layer stacking structure of touch screen

Abstract

The utility model discloses a multi-layer stacking structure of a touch screen. The multi-layer stacking structure comprises a main body structure, the main body structure comprises a module for displaying images and texts and a cover plate, and the cover plate is mounted on the module; comprising a multi-layer stacking structure arranged between the module and the cover plate; wherein the multi-layer stacked structure comprises a shielding film layer, a glass sensor and a copper foil, the shielding film layer and the glass sensor are sequentially attached to the module, the copper foil is connected with the shielding film layer and the module, the shielding film layer is attached to the module through a first optical adhesive layer, and the glass sensor is attached to the shielding film layer through a second optical adhesive layer. The cover plate is attached to the glass sensor through the third optical adhesive layer, and the two sides of the copper foil are attached to the shielding film layer and the module respectively. According to the invention, the full-lamination adhesive thickness segment difference can be filled, the conductivity is good, the shielding effect is greatly improved, the structural problem of a multi-layer stacked structure product is well solved, and the reliability of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch screen structure equipment, in particular to a multi-layer stacking structure of a touch screen. Background Art

[0002] A touch screen, also known as a "touch screen" or "touch panel", is an inductive liquid crystal display device that can receive input signals such as contacts. When a graphic button on the screen is touched, the tactile feedback system on the screen can drive various connection devices according to a pre-programmed program. It can be used to replace mechanical button panels and create vivid audio and video effects through the LCD display.

[0003] After searching, the Chinese patent application number is: CN201911196718.1, which discloses a touch screen with an integrated structure, including a cover plate, an upper ITO film, an ITO film of a lower electrode of the touch screen, and an integrated flexible circuit board. The upper ITO film is covered on the back of the cover plate through an upper fixed optical adhesive, and the ITO film of the lower electrode of the touch screen is covered on the upper ITO film through a lower fixed optical adhesive; a pattern is made on the back of the lower ITO film using a process in the backlight industry to form a backlight source light guide layer, and the pattern area is less than 5% of the back area of ​​the upper ITO film; the integrated flexible circuit board connects the upper ITO film and the ITO film of the lower electrode of the touch screen, and a light-emitting diode and a touch screen control IC are installed on the integrated flexible circuit board.

[0004] The above technical solution and the conventional touch screen structure have the following defects: the shielding layer grounding is achieved through silk-screen conductive ink and binding or welding process, which is not compatible with the multi-layer stacking structure. In order to solve the structural problem of shielding layer grounding for multi-layer stacking structure products (including full bonding), improve product reliability, and increase strong anti-interference performance, we need to propose a multi-layer stacking structure of the touch screen. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-layer stacking structure of a touch screen, which can fill the full-fit glue thickness step difference, has good conductivity, and greatly improves the shielding effect. It well solves the structural problems of multi-layer stacking structure products and improves the reliability of the product, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A multi-layer stacking structure of a touch screen includes a main body structure;

[0008] The main structure includes a module and a cover plate for displaying images and texts, and the cover plate is installed on the module;

[0009] It includes a multi-layer stacking structure disposed between the module and the cover plate;

[0010] Among them, the multi-layer stacking structure includes a shielding film layer, a glass sensor and a copper foil connecting the shielding film layer and the module, which are sequentially bonded to the module. The shielding film layer is bonded to the module through a first optical adhesive layer, the glass sensor is bonded to the shielding film layer through a second optical adhesive layer, and the cover plate is bonded to the glass sensor through a third optical adhesive layer. The two sides of the copper foil are respectively bonded to the shielding film layer and the module.

[0011] Preferably, the conductive surface of the shielding film layer faces the module and is attached to the upper side of the copper foil.

[0012] Preferably, the lower side of the copper foil is attached to the metal frame of the module.

[0013] Preferably, both sides of the copper foil are coated with conductive adhesive and then adhered to the shielding film layer and the module respectively, and the remaining area of ​​the copper foil is insulated.

[0014] Preferably, the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are all configured as OCA optical adhesives, and the thicknesses of the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are all 15-20 um.

[0015] Preferably, a protective film is laminated on the surface of the cover plate, and the protective film is a PET protective film.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model provides a main structure including a module and a cover plate, and a multilayer stacking structure including a shielding film layer, a glass sensor and a copper foil. The conductive surface of the shielding film layer is laminated downward, and conductive glue is attached to both sides of the copper foil (the sides in contact with the shielding layer and the module). The upper side is connected to the shielding layer, and the lower side is connected to the metal frame of the module. The remaining area is insulated, and the thickness step difference of the fully laminated glue can be filled. The conductivity is good, the shielding effect is greatly improved, the structural problem of the multilayer stacking structure product is well solved, and the reliability of the product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] In the figure: 1. module; 2. first optical adhesive layer; 3. shielding film layer; 4. second optical adhesive layer; 5. glass sensor; 6. third optical adhesive layer; 7. cover plate; 8. protective film; 9. copper foil. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 , the utility model provides a technical solution:

[0022] A multi-layer stacking structure of a touch screen includes a main structure; the main structure includes a module 1 for displaying images and a cover plate 7, and the cover plate 7 is installed on the module 1;

[0023] It includes a multi-layer stacking structure arranged between a module 1 and a cover plate 7; wherein the multi-layer stacking structure includes a shielding film layer 3, a glass sensor 5 and a copper foil 9 connecting the shielding film layer 3 and the module 1, which are sequentially adhered to the module 1, the shielding film layer 3 is adhered to the module 1 through a first optical adhesive layer 2, the glass sensor 5 is adhered to the shielding film layer 3 through a second optical adhesive layer 4, the cover plate 7 is adhered to the glass sensor 5 through a third optical adhesive layer 6, and the two sides of the copper foil 9 are respectively adhered to the shielding film layer 3 and the module 1.

[0024] The conductive surface of the shielding film layer 3 faces the module 1 and is attached to the upper side of the copper foil 9. The lower side of the copper foil 9 is attached to the metal frame of the module 1. Both sides of the copper foil 9 are coated with conductive glue and attached to the shielding film layer 3 and the module 1 respectively, and the remaining area of ​​the copper foil 9 is insulated.

[0025] By setting a main structure including a module 1 and a cover plate 7, a multi-layer stacking structure including a shielding film layer 3, a glass sensor 5 and a copper foil 9 is set, the shielding film layer 3 is laminated with a conductive surface facing downward, and conductive glue is attached to both sides of the copper foil 9 (the sides in contact with the shielding layer and the module 1), the upper side is connected to the shielding layer, and the lower side is connected to the metal frame of the module 1. The remaining area is insulated and can fill the full-laminated glue thickness step difference. The conductivity is good ≦10Ω, and the shielding effect is greatly improved. The structural problems of the multi-layer stacking structure product are well solved, and the reliability of the product is improved.

[0026] Among them, the shielding film can be set as a conductive polymer shielding film, which combines conductivity and flexibility and can be applied to display modules 1 with various curved surfaces and irregular shapes. They have relatively light weight and good processing performance and can be easily integrated into the module 1. In addition, the conductive polymer shielding film also has certain corrosion resistance and weather resistance, and can work stably in different environments.

[0027] See also Figure 1 , the utility model provides a technical solution:

[0028] A protective film 8 is laminated on the surface of the cover plate 7 , and the protective film 8 is a PET protective film 8 .

[0029] The protective film 8 is a PET protective film 8, which is a polyester film with moisture-proof, waterproof, dust-proof, anti-static functions, smooth surface, good transparency, and can block most harmful light and electromagnetic waves from passing through. Its main advantages include high transparency, high definition, excellent physical properties such as friction resistance and puncture resistance, as well as good optical properties and high light transmittance.

[0030] See also Figure 1 , the utility model provides a technical solution:

[0031] The first optical adhesive layer 2 , the second optical adhesive layer 4 and the third optical adhesive layer 6 are all configured as OCA optical adhesives, and the thickness of the first optical adhesive layer 2 , the second optical adhesive layer 4 and the third optical adhesive layer 6 are all 15-20 um.

[0032] The first optical adhesive layer 2, the second optical adhesive layer 4 and the third optical adhesive layer 6 can all be configured as OCA optical adhesives, thereby having the following advantages:

[0033] High transparency: Maintain the clarity and brightness of the screen without affecting the display effect.

[0034] High viscosity: ensures the stability and firmness of the screen, effectively preventing the screen from falling off and breaking.

[0035] Heat resistance: It can maintain stable performance even in high temperature environment.

[0036] Anti-reflection and anti-pollution: A thin film is formed on the surface of the display screen to reduce reflection and refraction, improve display effects, and effectively prevent the adhesion of pollutants such as grease, dust, and fingerprints.

[0037] Uniform thickness: The refractive index is close to that of glass, PC, and PMMA, and will not cause yellowing or aging problems after long-term use.

[0038] In some embodiments, the first optical adhesive layer 2, the second optical adhesive layer 4 and the third optical adhesive layer 6 can all be set to OCR optical adhesive. OCR may have similar performance to OCA in some applications, with excellent optical properties and adhesion, but may be more suitable for certain specific bonding processes or material combinations.

[0039] Specifically, the implementation of this application includes the following steps:

[0040] 1. Prepare materials: prepare copper foil 9, shielding layer, conductive glue and insulating material. Copper foil 9 should have sufficient conductivity and mechanical strength, shielding layer should have good conductivity and stability, conductive glue should have good conductivity and adhesion, and insulating material should have good insulation and stability.

[0041] 2. Cleaning: Clean the surface of the copper foil 9 and the shielding layer to remove impurities such as oil, dust, etc. on the surface to ensure the quality of subsequent processes.

[0042] 3. Apply conductive glue: Apply conductive glue evenly on both sides of the copper foil 9 (the two sides in contact with the shielding layer and the module 1). The amount of conductive glue applied should be moderate to ensure the conductive performance while avoiding excessive conductive glue overflow to affect the insulation treatment.

[0043] 4. Laminating the shielding layer: Lay the conductive surface of the shielding layer downward on the copper foil 9, so that the conductive adhesive between the shielding layer and the copper foil 9 is in full contact, and then cure the conductive adhesive by heat pressing or ultrasonic welding to form a stable conductive connection.

[0044] 5. Insulation treatment: Apply insulating material on the remaining area of ​​the copper foil 9. The insulating material should be evenly coated to completely cover the non-conductive area of ​​the copper foil 9 to ensure the overall insulation performance of the touch screen.

[0045] 6. Assemble module 1: Place the processed copper foil 9 and shielding layer assembly in the metal frame of module 1, ensure that the bottom of the copper foil 9 is in close contact with the metal frame of module 1, and then fix the copper foil 9 and shielding layer assembly to the metal frame of module 1 by appropriate fixing methods (such as screws, buckles, etc.).

[0046] 7. Product testing: Perform appearance inspection on the product, and then conduct power-on test on the product.

[0047] Conductive adhesive is used to achieve conductive connection between the copper foil 9 and the shielding layer, which ensures a firm connection and good conductive performance. The remaining area of ​​the copper foil 9 is insulated to effectively prevent electrical short circuits inside the touch screen. At the same time, the process is simple to operate and low in cost, and is suitable for large-scale production.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-layer stacking structure of a touch screen, characterized in that: Including the main structure; The main structure comprises a module (1) for displaying images and texts and a cover plate (7), wherein the cover plate (7) is mounted on the module (1); It comprises a multi-layer stacking structure arranged between a module (1) and a cover plate (7); The multi-layer stacked structure comprises a shielding film layer (3) and a glass sensor (5) which are sequentially bonded to the module (1), and a copper foil (9) connecting the shielding film layer (3) and the module (1); the shielding film layer (3) is bonded to the module (1) via a first optical adhesive layer (2); the glass sensor (5) is bonded to the shielding film layer (3) via a second optical adhesive layer (4); the cover plate (7) is bonded to the glass sensor (5) via a third optical adhesive layer (6); and two sides of the copper foil (9) are respectively bonded to the shielding film layer (3) and the module (1).

2. The multi-layer stacking structure of a touch screen according to claim 1, characterized in that: The conductive surface of the shielding film layer (3) faces the module (1) and is attached to the upper side of the copper foil (9).

3. The multi-layer stacking structure of a touch screen according to claim 1, characterized in that: The lower edge of the copper foil (9) is attached to the metal frame of the module (1).

4. The multi-layer stacking structure of a touch screen according to claim 1, characterized in that: Both sides of the copper foil (9) are coated with conductive adhesive and then adhered to the shielding film layer (3) and the module (1) respectively, and the remaining area of ​​the copper foil (9) is insulated.

5. The multi-layer stacking structure of a touch screen according to claim 1, characterized in that: The first optical adhesive layer (2), the second optical adhesive layer (4) and the third optical adhesive layer (6) are all configured as OCA optical adhesives, and the thickness of the first optical adhesive layer (2), the second optical adhesive layer (4) and the third optical adhesive layer (6) are all 15-20 um.

6. The multi-layer stacking structure of a touch screen according to claim 1, characterized in that: A protective film (8) is laminated on the surface of the cover plate (7), and the protective film (8) is configured as a PET protective film.

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