Structure for improving durability of GG touch screen

Abstract

The utility model discloses a structure for improving durability of a GG touch screen, which comprises a glass cover plate, touch sensor glass and a flexible printed circuit (FPC), the glass cover plate and the touch sensor glass are attached through an optical adhesive layer, the FPC is bound on the touch sensor glass through hot pressing and forms a binding area, and the GG touch screen is arranged in the binding area. A circle of protection glue is arranged on the periphery between the glass cover plate and the touch sensor glass, and the protection glue is used for sealing and preventing water vapor from entering the binding area. According to the structure for improving the durability of the GG touch screen, a circle of protection glue is arranged on the periphery between the glass cover plate and the touch sensor glass, and the protection glue can be evenly distributed in the gap between the glass cover plate and the touch sensor glass and wraps the binding area and the exposed surface circuit, so that the durability of the GG touch screen is improved, and the durability of the GG touch screen is improved. After the protection glue is fixed, water vapor is sealed and prevented from entering the wiring in the binding area, so that oxidation and short circuit of the adjacent metal wiring are avoided, the metal wiring is better protected, and the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of touch screens, in particular to a structure for improving the durability of a GG touch screen. Background Art

[0002] A touch screen, also known as a "touch panel" or "touch control panel", is an inductive liquid crystal display device that can receive input signals such as touches of a touch head. When a graphic button on the screen is touched, the tactile feedback system on the screen can drive various connecting devices according to a pre-programmed program, which can be used to replace a mechanical button panel and create vivid audio and video effects through a liquid crystal display screen. With the continuous development of touch screen technology, people have higher and higher requirements for the safety performance of touch screen production. As a main functional component of the touch screen, the flexible printed circuit board (FPC) also has higher requirements for the waterproof performance of its bonding area.

[0003] The existing GG-structured touch screens mainly include a cover plate, OCA, and a sensing glass. The three are bonded together to form a TP screen with touch function. However, OCA cannot completely prevent water vapor from entering. After the touch screen is used for a long time, water vapor will enter. Along with power-on, it will cause premature oxidation of metal traces and short circuit with adjacent metal traces, and oxidation open circuit problems will also occur. For example, the metal traces are slightly disconnected, so that this channel cannot be conducted, resulting in poor functionality of the touch screen. Especially for those micro-breaks, there are unstable functionality problems, which may fail before shipment, or may fail at the client side. At the same time, it is not excluded that it may also fail during market use. Therefore, it will not only cause serious economic losses, but also cause unnecessary customer complaints and affect the service life of the product. Summary of the Utility Model

[0004] Based on this, in view of the above technical problems, it is necessary to provide a structure for improving the durability of a GG touch screen. The flexible printed circuit board (FPC) is thermally pressed and bonded to the touch sensor glass, and then an optical adhesive layer is used to bond and connect the glass cover plate and the touch sensor glass, reducing the overall thickness of the touch screen. Then, a protective glue is provided in a circle around the periphery between the glass cover plate and the touch sensor glass. The protective glue will be evenly distributed in the gap between the glass cover plate and the touch sensor glass and wrap the bonding area and the exposed surface lines. After the protective glue is fixed, it seals and isolates air and water vapor from entering the traces inside the bonding area, thereby avoiding oxidation of the contacts with air or reaction with water vapor, resulting in short circuit between adjacent metal traces, better protecting the metal traces, and improving the service life of the product.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A structure for improving the durability of a GG touch screen, comprising:

[0007] A glass cover plate, a touch Sensor glass, and a flexible printed circuit board FPC. The glass cover plate and the touch Sensor glass are bonded together through an optical adhesive layer. The flexible printed circuit board FPC is thermally pressed and bonded to the touch Sensor glass to form a bonding area. A ring of protective adhesive is provided around the periphery between the glass cover plate and the touch Sensor glass. The protective adhesive is used to seal and isolate moisture from entering the bonding area.

[0008] Further, the optical adhesive layer is an OCA adhesive layer.

[0009] Further, the thickness of the protective adhesive does not exceed the height of the touch Sensor glass, so as to avoid affecting the assembly of the touch screen.

[0010] Further, the protective adhesive is a UV adhesive, and the UV adhesive is cured by UV irradiation.

[0011] Further, one side of the protective adhesive is bonded to the touch Sensor glass, the other side of the protective adhesive is bonded to the glass cover plate, and the third side of the protective adhesive is an arc structure.

[0012] Further, the protective adhesive extends into the gap between the glass cover plate and the touch Sensor glass to improve the sealing performance between the glass cover plate and the touch Sensor glass.

[0013] Further, the bonding area is provided between the glass cover plate and the touch Sensor glass. The glass cover plate is larger than the touch Sensor glass, and the flexible printed circuit board FPC is arranged outside.

[0014] Further, the flexible printed circuit board FPC is fixedly connected to the glass cover plate through epoxy resin on the other side of the protective adhesive. The epoxy resin is used to improve the sealing performance between the flexible printed circuit board FPC and the glass cover plate.

[0015] Further, anti-corrosion films for preventing moisture from entering are provided on the outer surfaces of the glass cover plate and the touch Sensor glass.

[0016] Further, the anti-corrosion film is a transparent silicon nitride thin film, and the thickness of the silicon nitride thin film is 5 - 10um.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] The structure for improving the durability of the GG touch screen provided by the present utility model chamfers the side of the touch Sensor glass close to the glass cover plate, and the protective glue can fill the chamfer and the gap, thereby increasing the bonding area and improving the sealing effect. Moreover, the flexible printed circuit board FPC is bonded to the glass cover plate by using epoxy resin, which can ensure good sealing on both sides of the flexible printed circuit board FPC.

[0019] The structure for improving the durability of the GG touch screen provided by the present utility model hot-presses and binds the flexible printed circuit board FPC on the touch Sensor glass, and then uses an optical adhesive layer to bond and connect the glass cover plate and the touch Sensor glass, reducing the overall thickness of the touch screen. Then, a circle of protective glue is provided on the periphery between the glass cover plate and the touch Sensor glass. The protective glue will be evenly distributed in the gap between the glass cover plate and the touch Sensor glass and wrap the bonding area and the exposed surface circuits. After the protective glue is fixed, it seals and isolates water vapor from entering the internal traces of the bonding area, thereby preventing the contacts from oxidizing with air or reacting with water vapor, resulting in a short circuit between adjacent metal traces, better protecting the metal traces, and increasing the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front view structural schematic diagram of the structure for improving the durability of the GG touch screen provided by the present utility model;

[0021] Figure 2 is a right view sectional structural schematic diagram of the structure for improving the durability of the GG touch screen provided by the present utility model;

[0022] Figure 3 is the Figure 1 enlarged schematic diagram of part A in the structure for improving the durability of the GG touch screen provided by the present utility model;

[0023] Figure 4 is the Figure 2 enlarged schematic diagram of part B in the structure for improving the durability of the GG touch screen provided by the present utility model;

[0024] Figure 5 is a schematic diagram of using epoxy resin in the structure for improving the durability of the GG touch screen provided by the present utility model.

[0025] The markings in the figure are explained as follows:

[0026] 1. Glass cover plate; 2. Touch Sensor glass; 3. Optical adhesive layer; 4. Flexible printed circuit board FPC; 5. Bonding area; 6. Protective glue; 7. Epoxy resin; 8. Anticorrosion film. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] As described in the background art, after long-term use, the existing touch screen structure will cause water vapor to enter. Along with power-on, there will be functional problems such as micro-disconnection, which may fail before shipment or at the client side. At the same time, it is not excluded that it will fail during market use, which will not only cause serious economic losses, but also lead to unnecessary customer complaints and affect the product usage cycle.

[0029] To solve this technical problem, the present utility model provides a structure for improving the durability of a GG touch screen. The flexible circuit board FPC4 is thermally pressed and bonded to the touch Sensor glass 2, and then the glass cover plate 1 and the touch Sensor glass 2 are bonded and connected by an optical adhesive layer 3, reducing the overall thickness of the touch screen. Then, a protective glue 6 is provided in a circle around the periphery between the glass cover plate 1 and the touch Sensor glass 2. The protective glue 6 will be evenly distributed in the gap between the glass cover plate 1 and the touch Sensor glass 2 and wrap the bonding area 5 and the exposed surface circuits. After the protective glue 6 is fixed, it seals and isolates water vapor from entering the internal wiring of the bonding area 5, thereby avoiding oxidation of the contacts with air or reaction with water vapor, resulting in short circuits between adjacent metal wirings, better protecting the metal wirings, and improving the product usage cycle.

[0030] Specifically, please refer to Figures 1-4 , the structure for improving the durability of a GG touch screen specifically includes:

[0031] A glass cover plate 1 and a touch Sensor glass 2, the glass cover plate 1 and the touch Sensor glass 2 are bonded through an optical adhesive layer 3. The thickness of the optical adhesive layer 3 is about 0.25 mm, and the glass cover plate 1 and the touch Sensor glass 2 can be fixed through the optical adhesive layer 3;

[0032] A flexible circuit board FPC4, the flexible circuit board FPC4 is thermally pressed and bonded to the touch Sensor glass 2 to form a bonding area 5. A protective glue 6 is provided in a circle around the periphery between the glass cover plate 1 and the touch Sensor glass 2, and the protective glue 6 is used to seal and isolate water vapor from entering the bonding area 5.

[0033] The structure for improving the durability of the GG touch screen provided by the present utility model reduces the overall thickness of the touch screen by thermally pressing and binding the flexible printed circuit board FPC4 onto the touch Sensor glass 2, and then bonding and connecting the glass cover plate 1 and the touch Sensor glass 2 with an optical adhesive layer 3. Then, a ring of protective adhesive 6 is provided around the periphery between the glass cover plate 1 and the touch Sensor glass 2. The protective adhesive 6 is evenly distributed in the gap between the glass cover plate 1 and the touch Sensor glass 2 and wraps the bonding area 5 and the exposed surface circuits. After the protective adhesive 6 is fixed, it seals and isolates water vapor from entering the internal traces of the bonding area 5, thereby preventing the contacts from oxidizing with air or reacting with water vapor, which may cause short circuits between adjacent metal traces, better protecting the metal traces, and increasing the service life of the product.

[0034] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] It should be noted that, without conflict, the embodiments and the features and technical solutions in the embodiments of the present utility model can be combined with each other.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] Please refer to Figures 1-3 , a structure for improving the durability of the GG touch screen, which includes a glass cover plate 1, a touch Sensor glass 2, and a flexible printed circuit board FPC4. The glass cover plate 1 and the touch Sensor glass 2 are bonded together by an optical adhesive layer 3. The thickness of the optical adhesive layer 3 is about 0.25 mm. The glass cover plate 1 and the touch Sensor glass 2 can be fixed by the optical adhesive layer 3. The flexible printed circuit board FPC4 is thermally pressed and bound onto the touch Sensor glass 2 to form a bonding area 5. A ring of protective adhesive 6 is provided around the periphery between the glass cover plate 1 and the touch Sensor glass 2. The protective adhesive 6 is used to seal and isolate water vapor from entering the bonding area 5.

[0038] Please refer to Figures 1-4, by thermally pressing and bonding the flexible printed circuit board FPC4 onto the touch Sensor glass 2, and then using an optical adhesive layer 3 to bond and connect the glass cover plate 1 and the touch Sensor glass 2, the overall thickness of the touch screen is reduced. Then, a protective adhesive 6 is provided in a circle around the periphery between the glass cover plate 1 and the touch Sensor glass 2. The protective adhesive 6 will be evenly distributed in the gap between the glass cover plate 1 and the touch Sensor glass 2, and wrap the bonding area 5 and the exposed surface circuits. After the protective adhesive 6 is fixed, it seals and isolates moisture from entering the internal traces of the bonding area 5, thereby preventing the contacts from oxidizing with air or reacting with moisture, resulting in a short circuit between adjacent metal traces, better protecting the metal traces, and increasing the service life of the product.

[0039] The structure for improving the durability of the GG touch screen provided in Embodiment 1 is further optimized. Specifically, as Figures 1-4 shown, the optical adhesive layer 3 is an OCA adhesive layer, and the thickness of the protective adhesive 6 does not exceed the height of the touch Sensor glass 2, so as not to increase the overall height. The assembly method of the touch screen is the same as before, avoiding affecting the assembly of the touch screen. Among them, the protective adhesive 6 is a UV adhesive, and the UV adhesive is cured by UV irradiation. In this way, the curing of the UV adhesive is not affected by temperature, and the use environment can be unrestricted, so that the UV irradiation curing of the protective adhesive 6 can be facilitated without adjusting the ambient temperature, and the sealing effect is better.

[0040] As Figure 2 and Figure 4 shown, one side of the protective adhesive 6 is attached to the touch Sensor glass 2, the other side of the protective adhesive 6 is attached to the glass cover plate 1, and the third side of the protective adhesive 6 is an arc structure. Through the above structural design, the protective adhesive 6 can be fully bonded and fixed to the glass cover plate 1 and the touch Sensor glass 2, and can better seal the gap between the glass cover plate 1 and the touch Sensor glass 2 through the protective adhesive 6, preventing moisture from entering the internal traces of the bonding area 5, avoiding oxidation and short circuit with adjacent metal traces, and better protecting the metal traces.

[0041] The structure for improving the durability of the GG touch screen provided in Embodiment 1 or 2 is further optimized. As Figure 2 and Figure 5 shown, the protective adhesive 6 extends into the gap between the glass cover plate 1 and the touch Sensor glass 2 to improve the sealing performance between the glass cover plate 1 and the touch Sensor glass 2. Specifically, a chamfer can be made on the side of the touch Sensor glass 2 close to the glass cover plate 1, and the protective adhesive 6 can fill the chamfer and the gap, thereby increasing the bonding area and improving the sealing effect;

[0042] The bonding area 5 is arranged between the glass cover plate 1 and the touch Sensor glass 2. The glass cover plate 1 is larger than the touch Sensor glass 2, and the flexible printed circuit board FPC4 is arranged outside. The flexible printed circuit board FPC4 is located on the other side of the protective glue 6 and is fixedly connected to the glass cover plate 1 through the epoxy resin 7. The epoxy resin 7 is used to improve the sealing performance between the flexible printed circuit board FPC4 and the glass cover plate 1. By bonding the flexible printed circuit board FPC4 and the glass cover plate 1 together with the epoxy resin 7, it can ensure better sealing on both sides of the flexible printed circuit board FPC4 and prevent gaps from appearing at the protective glue 6 when the flexible printed circuit board FPC4 is bent.

[0043] The structure for improving the durability of the GG touch screen provided in the above embodiments is further optimized. For example, Figure 5 As shown, anti-corrosion films 8 for preventing water vapor from entering are provided on the outer surfaces of both the glass cover plate 1 and the touch Sensor glass 2. The anti-corrosion film 8 is a transparent silicon nitride thin film, and the thickness of the silicon nitride thin film is 5 - 10um. By providing the silicon nitride thin film, the surfaces of the glass cover plate 1 and the touch Sensor glass 2 are protected. Since the silicon nitride thin film is non-conductive and covers the entire surface, the waterproof performance of the silicon nitride thin film can better protect the circuits in the bonding area 5 from water vapor corrosion.

[0044] The using process of the structure for improving the durability of the GG touch screen provided by the present utility model is as follows:

[0045] By thermally pressing and bonding the flexible printed circuit board FPC4 to the touch Sensor glass 2, and then using the optical adhesive layer 3 to bond and connect the glass cover plate 1 and the touch Sensor glass 2, the overall thickness of the touch screen is reduced. Then, a circle of protective glue 6 is arranged around the periphery between the glass cover plate 1 and the touch Sensor glass 2. The protective glue 6 will be evenly distributed in the gap between the glass cover plate 1 and the touch Sensor glass 2 and wrap the bonding area 5 and the exposed surface circuits. After the protective glue 6 is fixed, it seals and isolates water vapor from entering the internal traces of the bonding area 5, thereby preventing the contacts from oxidizing with air or reacting with water vapor, resulting in short circuits between adjacent metal traces, better protecting the metal traces, increasing the service life of the product, and by chamfering the side of the touch Sensor glass 2 close to the glass cover plate 1, the protective glue 6 can fill the chamfer and the gap, thereby increasing the bonding area and improving the sealing effect, and using the epoxy resin 7 to bond the flexible printed circuit board FPC4 and the glass cover plate 1 together can ensure better sealing on both sides of the flexible printed circuit board FPC4.

[0046] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. The accompanying drawings show the preferred embodiments of the present utility model, but do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structures directly or indirectly using the content of the specification and drawings of the present utility model in other related technical fields are equally within the scope of the patent protection of the present utility model.

Claims

1. A structure for improving the durability of a GG touch screen, characterized in that, It includes: A glass cover plate (1) and a touch Sensor glass (2), and the glass cover plate (1) and the touch Sensor glass (2) are bonded through an optical adhesive layer (3); A flexible printed circuit board FPC (4), the flexible printed circuit board FPC (4) is thermally pressed and bonded on the touch Sensor glass (2) to form a bonding area (5), and a circle of protective adhesive (6) is arranged peripherally between the glass cover plate (1) and the touch Sensor glass (2), and the protective adhesive (6) is used to seal and isolate water vapor from entering the bonding area (5).

2. The structure for improving the durability of the GG touch screen according to claim 1, wherein The optical adhesive layer (3) is an OCA adhesive layer.

3. The structure for improving the durability of the GG touch screen according to claim 2, wherein, The thickness of the protective adhesive (6) does not exceed the height of the touch Sensor glass (2) to avoid affecting the assembly of the touch screen.

4. The structure for improving the durability of the GG touch screen according to claim 3, wherein The protective adhesive (6) is a UV adhesive, and the UV adhesive is cured by UV irradiation.

5. The structure for improving the durability of the GG touch screen according to claim 4, characterized in that, One side of the protective adhesive (6) is bonded to the touch Sensor glass (2), the other side of the protective adhesive (6) is bonded to the glass cover plate (1), and the third side of the protective adhesive (6) is an arc structure.

6. The structure for improving the durability of the GG touch screen according to claim 5, wherein, The protective adhesive (6) extends into the gap between the glass cover plate (1) and the touch Sensor glass (2) to improve the sealing performance between the glass cover plate (1) and the touch Sensor glass (2).

7. The structure for improving the durability of the GG touch screen according to claim 6, characterized in that, The bonding area (5) is arranged between the glass cover plate (1) and the touch Sensor glass (2), the glass cover plate (1) is larger than the touch Sensor glass (2), and the flexible printed circuit board FPC (4) is arranged outside.

8. The structure for improving the durability of the GG touch screen according to claim 7, wherein, The flexible printed circuit board FPC (4) is located on the other side of the protective adhesive (6) and is fixedly connected to the glass cover plate (1) through an epoxy resin (7), and the epoxy resin (7) is used to improve the sealing performance between the flexible printed circuit board FPC (4) and the glass cover plate (1).

9. The structure for improving the durability of the GG touch screen according to claim 8, wherein, Anti-corrosion films (8) for preventing water vapor from entering are arranged on the outer surfaces of the glass cover plate (1) and the touch Sensor glass (2).

10. The structure for improving the durability of the GG touch screen according to claim 9, characterized in that, The anti-corrosion film (8) is a transparent silicon nitride film, and the thickness of the silicon nitride film is 5-10um.

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