A touch screen device with anti-static and electromagnetic interference

Abstract

This invention discloses a touchscreen device with anti-static and anti-electromagnetic interference properties, comprising a glass cover, ITO glass, an LCD display, metal foil, and metal foil connecting strips. The glass cover and ITO glass are bonded and fixed together using SCA solid adhesive. The LCD display is bonded and fixed to the back of the ITO glass using OCA optical adhesive. The four sides and back of the LCD display are encapsulated with metal material, which also serves as a common grounding terminal for the touchscreen device and the LCD display. The metal foil surrounding the ITO glass is connected to the metal material encapsulation of the LCD display via metal foil connecting strips, forming a ring-shaped, single-point grounded metal structure. The integrated circuit portion of the FPC circuit board and its metal conductor reinforcement are placed together in a flat metal housing, attached to the metal encapsulation on the back of the LCD display housing, and maintain good electrical connection. The grounding protection, electrostatic discharge, and electromagnetic shielding methods for the touchscreen are more comprehensive, and it has high anti-static and anti-electromagnetic interference performance, which can meet the requirements of special working conditions and is conducive to the rapid and high-quality development of touchscreens, especially capacitive touchscreens.

Description

Technical Field

[0001] This invention relates to touchscreen technology, and more particularly to a capacitive touchscreen device with anti-static and anti-electromagnetic interference properties. Background Technology

[0002] Touchscreens, especially capacitive touchscreens, are widely used in various applications such as mobile phones, laptops, supermarket payment devices, and automotive electronics, making them one of the essential electronic terminal devices in modern work, study, and home life. However, in the modern environment, static electricity and electromagnetic pollution are becoming increasingly serious, significantly interfering with the safe operation of touchscreens.

[0003] Existing touchscreens, especially capacitive touchscreens, have various shortcomings and drawbacks in their design, manufacturing, and use. For example, the ITO glass, a core functional component of the touchscreen, lacks effective shielding and protection on its sides; FPC flexible circuit boards rely solely on external electromagnetic films for anti-static and electromagnetic interference protection; touchscreen grounding protection methods are limited; and the metal casing of LCD displays is not fully utilized as a common ground. Currently, the overall anti-static and electromagnetic interference performance of touchscreens is weak, failing to meet the growing market demand and thus hindering the rapid and high-quality development of touchscreens, especially capacitive touchscreens.

[0004] Therefore, designing and manufacturing a high-level touchscreen structure with strong anti-static and anti-electromagnetic interference capabilities to improve the overall quality of touchscreens, especially capacitive ones, in order to meet the requirements of special working conditions has become an urgent task.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a touch screen device that is resistant to static electricity and electromagnetic interference, so as to solve the above-mentioned technical problems existing in the prior art.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A touch screen device with anti-static and anti-electromagnetic interference features includes a glass cover plate 1, a metal foil 3, a metal foil connecting strip 4, an ITO glass 5, and an LCD display screen 7.

[0009] The glass cover 1 is located on the outermost side of the touch screen and is bonded and fixed to the ITO glass 5 by SCA solid adhesive;

[0010] The LCD display screen 7 is bonded to the back of the ITO glass 5 using OCA optical adhesive;

[0011] On the inner surface of the glass cover plate 1, near the outer edge, an opaque ink layer is printed to form the cover plate edge silkscreen 2. The area enclosed by the cover plate edge silkscreen 2 is the visible area, forming the window 6 of the LCD display screen 7.

[0012] The four sides and back of the LCD display 7 are encapsulated with metal material, which also serves as the common grounding terminal for the touch screen device and the LCD display 7.

[0013] Compared with the prior art, the touch screen device with anti-static and anti-electromagnetic interference provided by the present invention has a comprehensive grounding protection method for the touch screen and has high anti-static and anti-electromagnetic interference performance, which can meet the requirements of special working conditions and is conducive to the rapid and high-quality development of touch screens, especially capacitive touch screens. Attached Figure Description

[0014] Figure 1 A schematic diagram of a touch screen device with anti-static and anti-electromagnetic interference properties is provided for embodiments of the present invention.

[0015] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present invention.

[0016] In the picture:

[0017] 1. Glass cover plate, 2. Screen printing on the cover plate edge, 3. Metal foil, 4. Metal foil connecting strip, 5. ITO glass, 6. Window, 7. LCD display screen, 8. Sealing adhesive. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them, and do not constitute a limitation on the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0019] First, the following explanations are provided for the terms that may be used in this article:

[0020] The terms “including,” “contains,” “comprising,” “having,” or other similar semantic descriptions shall be interpreted as non-exclusive inclusion.

[0021] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0022] The technical solution provided by this invention will be described in detail below. Contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this invention whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0023] like Figure 1 , Figure 2 As shown, a touch screen device with anti-static and anti-electromagnetic interference features includes a glass cover plate 1, a metal foil 3, a metal foil connecting strip 4, an ITO glass 5, and an LCD display screen 7.

[0024] The glass cover 1 is located on the outermost side of the touch screen and is bonded and fixed to the ITO glass 5 by SCA solid adhesive;

[0025] The LCD display screen 7 is bonded to the back of the ITO glass 5 using OCA optical adhesive;

[0026] On the inner surface of the glass cover plate 1, near the outer edge, a layer of non-transparent ink is printed to form the cover plate edge silkscreen 2. The area enclosed by the cover plate edge silkscreen 2 is the visible area, forming the window 6 of the LCD display screen 7.

[0027] The four sides and back of the LCD display 7 are encapsulated with metal material, which also serves as the common grounding terminal for the touch screen device and the LCD display 7.

[0028] A ring of sealing adhesive 8 is provided on the outer side of the ITO glass above the screen printing 2 on the cover plate edge. The sealing adhesive 8 is divided into two layers, with a metal foil 3 placed between the two layers.

[0029] The metal foil 3 has a ring-shaped closed structure and is connected to the metal foil connecting strip 4. It is also connected to the metal material of the LCD display screen 7 through the metal foil connecting strip 4, forming a ring-shaped single-point grounded metal structure around the ITO glass 5.

[0030] The metal foil 3 is a metal or alloy with good ductility, flexibility, conductivity, and magnetic permeability.

[0031] The ITO glass has a highly transparent conductive metal thin layer on both sides. The highly transparent conductive metal thin layer uses metal or alloy materials that meet the requirements of touch screens, such as indium tin oxide or graphene.

[0032] An FPC circuit board is fixed to the back side of the metal material package of the LCD display screen. The reinforcement of the FPC circuit board is attached to and connected to the metal material package of the LCD display screen 7 to form a common ground.

[0033] The FPC circuit board and its metal conductor reinforcement can be placed together in a flat metal housing, which is attached to the metal package on the back of the LCD display 7 and makes conductive contact.

[0034] The flat metal housing is fixed to the LCD display screen 7 by any of the following structures:

[0035] Fixing methods include conductive adhesive bonding, snap-fit ​​fixing, screw fixing, and welding fixing.

[0036] The sealing and fixing adhesive 8 is mainly used for sealing and fixing.

[0037] The FPC circuit board and its metal conductor reinforcement can be placed together in a flat metal housing, which is attached to the metal package on the back of the LCD display 7 and maintains reliable conductive contact.

[0038] In summary, the touchscreen device of the present invention, which is resistant to static electricity and electromagnetic interference, not only overcomes the various shortcomings and drawbacks of existing touchscreens, especially capacitive touchscreens, in design, manufacturing, and use, such as the lack of effective shielding and protection on the side of the core functional component ITO glass 5, the reliance on electromagnetic films for anti-static and electromagnetic radiation protection of the FPC flexible circuit board, the single grounding protection method of the touchscreen, and the lack of full utilization of the metal casing of the LCD display as a common ground, but also overcomes the problem that the overall anti-static and electromagnetic interference performance of current touchscreens is weak, which cannot meet the growing market demand and thus restricts the rapid and high-quality development of touchscreens, especially capacitive touchscreens.

[0039] To more clearly demonstrate the technical solution and its effects provided by the present invention, the following detailed description of the touch screen device with anti-static and anti-electromagnetic interference provided by the present invention is based on specific embodiments.

[0040] Example 1

[0041] like Figure 1 , Figure 2 As shown,

[0042] A touchscreen structure with high anti-static and anti-electromagnetic interference (ESI) properties, particularly a capacitive touchscreen structure, comprises a glass cover plate 1, a screen printing element on the cover plate edge 2, a metal foil 3, a metal foil connecting strip 4, an ITO glass 5, a viewing window 6, an LCD display screen 7, and a sealing adhesive 8. An annular metal foil 3 and a metal foil connecting strip 4 are added to the outside of the ITO glass of the touchscreen. These two elements are connected together and, through the metal foil connecting strip 4, connected to the metal casing on the back of the LCD display screen 7, forming a common ground structure. Simultaneously, the metal casing on the back of the LCD display screen 7 also maintains a reliable connection to the metal shielding casing structure of the FPC circuit and a reliable connection to the power ground. Through the "Faraday cage" effect, combined with other optimization measures, reliable grounding protection and high ESI / E resistance are achieved for the touchscreen.

[0043] The glass cover 1 is located on the outermost side of the touchscreen and is fixed to the ITO glass 5 with SCA solid adhesive, serving to prevent dust, moisture, and scratches on the internal ITO glass. On the inner surface of the glass cover 1, a layer of non-transparent ink is printed at a certain distance from the outer edge of the glass cover using printing technology, forming the so-called cover edge silkscreen 2. The visible area inside the cover edge silkscreen 2 is the window 6, used for inputting information or viewing information on the LCD display screen via touch. The ITO glass 5 is the core component and is bonded and fixed to the LCD display screen 7 with OCA optical adhesive. The four sides and back of the LCD display screen 7 are encapsulated with metal material, which also serves as the common grounding terminal for the touchscreen and the LCD display screen.

[0044] Above the silkscreen 2 on the edge of the cover plate and on the outside of the ITO glass 5 is the sealing and fixing adhesive 8. The structural design and material selection of the sealing and fixing adhesive are relatively flexible, as long as they meet the sealing and fixing requirements. It can be designed as a strip, divided into upper and lower layers. In the middle of the two layers, the metal foil 3 can be placed. The metal foil has a ring-shaped closed structure and is connected to the metal foil connecting strip 4. The metal foil connecting strip 4 is connected to the metal encapsulation shell on the back of the LCD display screen 7, thereby forming a ring-shaped single-point grounded metal structure around the ITO glass 5. According to the "Faraday cage" effect, it plays a good role in anti-static and electromagnetic radiation protection.

[0045] The metal foil 3 is designed as a closed ring structure and is placed on the cover plate edge silkscreen 2 and on the outside of the ITO glass 5, close to the outer edge of the ITO glass 5. It is fixed and sealed by the sealing adhesive 8 and other materials. The metal foil 3 is connected to the metal foil connecting strip 4 to form a whole, and is connected to the metal shell of the LCD display screen through the metal foil tail strip 4. Note that it is a single-point connection, so as to form a conductor connected to the ground. The metal material is selected as a good conductor material with strong oxidation resistance.

[0046] In the touch screen structure, the metal foil 3 can be designed as a flat structure with good electrical and magnetic conductivity and a certain thickness and width to achieve the best electromagnetic shielding effect.

[0047] In the touch screen structure, the metal foil connecting strip 4 can be made of metal or alloy with good ductility and flexibility, and can be designed into the shape of a metal sheet structure. At the same time, the lead-out direction and method of the metal foil connecting strip 4 can be flexibly designed to facilitate reliable bonding and connection with the metal shell of the LCD display. Meanwhile, the metal or alloy material is selected to be a material with good electrical and magnetic conductivity to achieve the best grounding and electromagnetic shielding effect.

[0048] On the back side of the LCD display screen housing, a touch screen FPC circuit board is placed and fixed. The FPC circuit is a flexible circuit, and its "reinforcing component" is a metal conductor that is attached and connected to the LCD display screen housing to form a common ground. Furthermore, a small, flat metal housing can be designed to house the integrated circuit part of the FPC circuit, including the "reinforcing component," and attach the flat metal housing to the metal plate on the back of the LCD display screen housing to maintain reliable conductive contact. The flat metal housing and the LCD display screen can be connected and fixed in various ways, including bonding with conductive adhesive, snap-fit ​​fixing, screw fixing, or welding. At the same time, the LCD display screen must ensure reliable grounding to shield and protect the integrated circuit part of the FPC circuit.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of the present invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A touchscreen device with anti-static and anti-electromagnetic interference properties, characterized in that, Includes glass cover (1), metal foil (3), metal foil connecting strip (4), ITO glass (5), and LCD display (7); The glass cover (1) is located on the outermost side of the touch screen and is bonded and fixed to the ITO glass (5) by SCA solid adhesive; The LCD display screen (7) is bonded to the back of the ITO glass (5) using OCA optical adhesive; On the inner surface of the glass cover (1), near the outer edge, a layer of non-transparent ink is printed to form a cover edge screen printing (2). The area enclosed by the cover edge screen printing (2) is a visible area, forming the window (6) of the LCD display screen (7). The four sides and back of the LCD display (7) are encapsulated by a metal material, which also serves as the common grounding terminal for the touch screen device and the LCD display (7).

2. The touchscreen device with anti-static and anti-electromagnetic interference properties according to claim 1, characterized in that, A ring of sealing adhesive (8) is provided on the outer side of the ITO glass above the screen printing (2) on the cover plate. The sealing adhesive (8) is divided into two layers, with a metal foil (3) placed between the two layers. The metal foil (3) has a ring-shaped closed structure and is connected to the metal foil connecting strip (4). It is also connected to the metal material of the LCD display screen (7) through the metal foil connecting strip (4), forming a ring-shaped single-point grounded metal structure around the ITO glass (5).

3. The touchscreen device with anti-static and anti-electromagnetic interference properties according to claim 2, characterized in that, The metal foil (3) is a metal or alloy with good ductility, flexibility, conductivity and magnetic permeability.

4. The touchscreen device with anti-static and anti-electromagnetic interference properties according to claim 3, characterized in that, The ITO glass has a highly transparent conductive metal thin layer on both sides. The highly transparent conductive metal thin layer uses metal or alloy materials that meet the requirements of touch screens, such as indium tin oxide or graphene.

5. The touchscreen device with anti-static and anti-electromagnetic interference properties according to any one of claims 1 to 4, characterized in that, An FPC circuit board is fixed to the back side of the metal material package of the LCD display screen. The reinforcement of the FPC circuit board is attached to and connected to the metal material package of the LCD display screen (7) to form a "common ground".

6. The touchscreen device with anti-static and anti-electromagnetic interference properties according to claim 5, characterized in that, The FPC circuit board and its metal conductor reinforcement can be placed together in a flat metal housing, which is attached to the metal package on the back of the LCD display (7) and makes conductive contact.

7. The touchscreen device with anti-static and anti-electromagnetic interference properties according to claim 6, characterized in that, The flat metal housing is fixed to the LCD display screen (7) by any of the following structures: Fixing methods include conductive adhesive bonding, snap-fit ​​fixing, screw fixing, and welding fixing.

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