Metal grid touch screen, preparation method thereof and touch module

Abstract

The embodiment of the invention provides a metal grid touch screen, a preparation method of the metal grid touch screen and a touch module. The metal grid touch screen comprises a light-transmitting substrate, a first induction electrode layer, an insulating light resistance layer, a second induction electrode layer and a shielding layer. The first induction electrode layer, the insulating photoresist layer, the second induction electrode layer and the film covering layer are sequentially stacked on the light-transmitting substrate, and a first electrode strip of the first induction electrode layer is provided with a first pattern; a second electrode strip of the second induction electrode layer is provided with a second pattern, and lines forming the first pattern and lines forming the second pattern are arranged in a staggered mode in the thickness direction of the light-transmitting substrate; the insulating photoresist layer is a transparent layer formed by coating and hardening, the hardness of the insulating photoresist layer is greater than or equal to 3H, and the shielding layer is arranged on the second surface. Therefore, the metal grid touch screen provided by the embodiment of the invention has the advantages of improving the etching quality of the second induction electrode layer and reducing signal crosstalk and resolution while reducing the overall thickness.

Description

Technical Field

[0001] This invention relates to the field of touch screen technology, specifically to a metal mesh touch screen and its manufacturing method, and a touch module having the metal mesh touch screen. Background Technology

[0002] With the development of touch technology, traditional resistive touchscreens have been gradually replaced by thinner, lighter, and more performant capacitive touchscreens. However, capacitive touchscreens typically rely on fingers or capacitive styluses for operation, and their touch accuracy is relatively low. Among related technologies, touchscreens using a combination of electromagnetic and capacitive technologies can significantly improve writing accuracy and the human-computer interaction experience, but this type of touchscreen not only increases the overall thickness of the touchscreen but also has weak resistance to electromagnetic interference. Summary of the Invention

[0003] In view of this, the present invention aims to provide a metal mesh touch screen, its manufacturing method and touch module, to solve the problem that the existing electromagnetic capacitive touch screens have large thickness and poor anti-interference ability due to unreasonable layout.

[0004] One aspect of this invention is a metal mesh touchscreen.

[0005] Another aspect of the present invention provides a method for manufacturing a metal mesh touch screen.

[0006] Another aspect of the present invention provides a touch module.

[0007] The metal mesh touch screen of this invention includes a light-transmitting substrate, a first sensing electrode layer, an insulating photoresist layer, a second sensing electrode layer, and a shielding layer.

[0008] The light-transmitting substrate includes a first surface and a second surface disposed opposite to each other along its thickness direction; a first sensing electrode layer, an insulating photoresist layer, a second sensing electrode layer, and a coating layer are sequentially stacked on the first surface; the first sensing electrode layer includes a plurality of first electrode strips disposed at intervals along a first direction, and the first electrode strips have a first pattern; the second sensing electrode layer includes a plurality of second electrode strips disposed at intervals along a second direction, and the second electrode strips have a second pattern; the lines constituting the first pattern and the lines constituting the second pattern are staggered in the thickness direction of the light-transmitting substrate; wherein the insulating photoresist layer is a transparent layer formed by coating and hardening, and the hardness of the insulating photoresist layer is greater than or equal to 3H, the first direction and the second direction are perpendicular to each other, and the shielding layer is disposed on the second surface.

[0009] The metal mesh touchscreen of this invention, by placing both the first and second sensing electrode layers on the same side of the thickness direction of the light-transmitting substrate and separating them by an insulating photoresist layer, requires only one light-transmitting substrate compared to conventional touchscreens, thus saving the thickness space of at least one light-transmitting substrate. Integrating the first sensing electrode layer, the second sensing electrode layer, and the shielding layer onto a single light-transmitting substrate results in a thinner and lighter overall structure for the metal mesh touchscreen.

[0010] Meanwhile, the metal mesh touchscreen of this embodiment of the invention, by staggering the lines constituting the first pattern and the lines constituting the second pattern along the thickness direction of the light-transmitting substrate, can reduce the interference effect of the first and second electrode strips due to overlapping or parallel arrangement, reduce the mutual influence of electric fields, and lower signal crosstalk. Therefore, the staggered arrangement of lines helps to improve the accuracy of touch detection. Moreover, the staggered mesh pattern can effectively increase the number of sensing points without increasing the number of electrodes, thereby improving the spatial resolution of the touchscreen.

[0011] Furthermore, when the hardness of the insulating photoresist layer reaches or exceeds 3H, it signifies high surface hardness and wear resistance. This allows the insulating photoresist layer to better resist mechanical stress and reduces the likelihood of it peeling off due to external forces, which is beneficial for the processing accuracy of the second sensing electrode layer. Because the high-hardness insulating photoresist layer is less prone to deformation or damage during sputtering and etching processes, it reduces the problem of touchscreen defects caused by insulating photoresist layer breakage, thus helping to ensure high-quality product output.

[0012] Therefore, the metal mesh touch screen of this invention reduces the overall thickness while also improving the etching quality of the second sensing electrode layer, reducing signal crosstalk, and improving resolution.

[0013] In one embodiment, the thickness of the insulating photoresist layer is 2μm-8μm.

[0014] In one embodiment, the cross-cut test value of the insulating photoresist layer is greater than or equal to 5B.

[0015] In one embodiment, the insulating photoresist layer is a transparent layer formed by coating and hardening a mixture of ethyl acetate and adhesive.

[0016] In one embodiment, the transmittance of the insulating photoresist layer is greater than 90%.

[0017] In one embodiment, the melting point of the insulating photoresist layer is greater than 200°C.

[0018] In one embodiment, the metal mesh touch screen further includes a first metal pin and a plurality of first metal leads. Each first electrode strip includes a first metal mesh area and a first circuit connection area. Each first metal mesh area is provided with the first pattern. The first circuit connection area of ​​each first electrode strip is disposed on the edge of one side in the second direction. The plurality of first metal leads are connected one-to-one to the plurality of first circuit connection areas. The insulating photoresist layer is provided with a clearance portion in the area of ​​the first circuit connection area.

[0019] In one embodiment, the metal mesh touch screen further includes a second metal pin and a second metal lead. Each second electrode strip includes a second metal mesh area and a second circuit connection area. Each second metal mesh area is provided with the second pattern. The second circuit connection area of ​​each second electrode strip is disposed on the edge of one side of the first direction. Each second metal lead is connected between the second circuit connection area and the second metal pin. The second metal pin is fixed on the light-transmitting substrate or the insulating photoresist layer.

[0020] In one embodiment, the first pattern is a cross-shaped pattern and / or a grid pattern.

[0021] In one embodiment, the second pattern is a cross-shaped pattern and / or a grid pattern.

[0022] In one embodiment, each line constituting the first pattern forms an angle with each of the first direction and the second direction; each line constituting the second pattern forms an angle with each of the first direction and the second direction.

[0023] In one embodiment, the width of each line constituting the first pattern is 2μm-7μm.

[0024] In one embodiment, the width of each line constituting the second pattern is 2μm-7μm.

[0025] In one embodiment, the light-transmitting substrate is a PET layer, and the thickness of the light-transmitting substrate is 30μm-100μm.

[0026] In one embodiment, the thickness of the first sensing electrode layer is 400nm-1500nm.

[0027] The method for manufacturing a metal mesh touchscreen according to an embodiment of the present invention includes the following steps:

[0028] S1 forms a first coating on the first surface of the light-transmitting substrate, and presses a film onto the first coating, and forms a laminate by exposure to generate a cross-linking reaction between the pressed film and the first coating.

[0029] S2 involves sequentially etching the first coating layer with a weak alkaline solution, an acidic etching solution, and a strong alkaline solution to form the first sensing electrode layer.

[0030] S3 coats an insulating photoresist material onto the first sensing electrode layer, hardens and cures it to form the insulating photoresist layer, wherein the melting point of the insulating photoresist layer is greater than 200°C.

[0031] S4 forms a second coating on the insulating photoresist layer, and then performs lamination, exposure, and etching on the second coating to form the second sensing electrode layer.

[0032] S5 coats the surface of the second sensing electrode layer to form a coating layer.

[0033] The touch module of this invention includes a metal mesh touch screen according to any one of the above-described embodiments. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a metal mesh touchscreen according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the stacking of a metal mesh touch screen according to an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the structure of the first sensing electrode layer in an embodiment of the present invention.

[0037] Figure 4 yes Figure 3 Enlarged view at point A.

[0038] Figure 5 This is a schematic diagram of the structure of the insulating photoresist layer according to an embodiment of the present invention.

[0039] Figure 6 This is a schematic diagram of the structure of the second sensing electrode layer in an embodiment of the present invention.

[0040] Figure 7 yes Figure 6 Enlarged view at point B.

[0041] Explanation of reference numerals in the attached figures:

[0042] Transparent substrate 1;

[0043] First sensing electrode layer 2; First electrode strip 21; First metal mesh area 211; First circuit connection area 212;

[0044] Insulating photoresist layer 3;

[0045] Second sensing electrode layer 4; Second electrode strip 41; Second metal mesh area 411; Second circuit connection area 412;

[0046] 5. Coating layer. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0048] The following is for reference. Figures 1-7 The present invention provides an example description of a metal mesh touch screen, its preparation method, and a touch module according to embodiments of the present invention.

[0049] The metal mesh touch screen of this invention includes a light-transmitting substrate 1, a first sensing electrode layer 2, an insulating photoresist layer 3, a second sensing electrode layer 4, and a shielding layer 6.

[0050] The light-transmitting substrate 1 includes components along its thickness direction (e.g., Figure 2 The vertical direction shown is relative to the first surface (e.g., the vertical direction shown). Figure 2 The upper surface shown) and the second surface (e.g., Figure 2 (The lower surface shown). A first sensing electrode layer 2, an insulating photoresist layer 3, and a second sensing electrode layer 4 are sequentially stacked on the first surface. The first sensing electrode layer 2 includes a plurality of first electrode strips 21 spaced apart along a first direction, and the first electrode strips 21 have a first pattern. The second sensing electrode layer 4 includes a plurality of second electrode strips 41 spaced apart along a second direction, and the second electrode strips 41 have a second pattern. The lines forming the first pattern and the lines forming the second pattern are staggered in the thickness direction of the light-transmitting substrate 1. The insulating photoresist layer 3 is a transparent layer formed by coating and hardening, and the hardness of the insulating photoresist layer 3 is greater than or equal to 3H. The first direction and the second direction are perpendicular to each other. A shielding layer 6 is disposed on the second surface.

[0051] The metal mesh touchscreen of this invention, by placing the first sensing electrode layer 2 and the second sensing electrode layer 4 on the same side of the thickness direction of the light-transmitting substrate 1, and separating the first sensing electrode layer 2 and the second sensing electrode layer 4 by an insulating photoresist layer 3, requires only one light-transmitting substrate 1 compared to conventional touchscreen displays, thus saving the thickness space of at least one light-transmitting substrate 1. The metal mesh touchscreen of this invention integrates the first sensing electrode layer 2, the second sensing electrode layer 4, and the shielding layer 6 onto a single light-transmitting substrate 1, resulting in a thinner and lighter overall structure.

[0052] Meanwhile, the metal mesh touchscreen of this embodiment of the invention, by staggering the lines constituting the first pattern and the lines constituting the second pattern in the thickness direction of the light-transmitting substrate 1, can reduce the interference effect of the first electrode strip 21 and the second electrode strip 41 due to overlapping or parallel arrangement, reduce the mutual influence of electric fields, and reduce signal crosstalk. Therefore, the staggered arrangement of lines helps to improve the accuracy of touch detection. Moreover, the staggered mesh pattern can effectively increase the number of sensing points without increasing the number of electrodes, thereby improving the spatial resolution of the touchscreen.

[0053] Furthermore, when the hardness of the insulating photoresist layer 3 reaches or exceeds 3H, it means that the insulating photoresist layer 3 has high surface hardness and wear resistance, thus enabling the insulating photoresist layer 3 to better resist mechanical stress and reduce the possibility of peeling off due to external forces. This is beneficial for maintaining the processing accuracy of the sensing electrode layers on both sides. Because the high-hardness insulating photoresist layer 3 is less prone to deformation or damage during sputtering and etching, it reduces the problem of touch screen defects caused by breakage of the insulating photoresist layer 3 during production, which helps ensure high-quality product output.

[0054] Therefore, the metal mesh touch screen of this embodiment of the invention not only reduces the overall thickness, but also improves the etching quality of the second sensing electrode layer 4, reduces signal crosstalk, and improves resolution.

[0055] Optionally, the light-transmitting substrate 1 can be a rigid substrate or a flexible substrate. The rigid substrate can be made of glass, tempered glass, sapphire, ceramic, or other suitable materials; the flexible substrate can be made of a polymer material. For example, polymer materials include polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), nylon, polycarbonate (PC), polyurethane (PU), polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polyimide (PI), acrylic resin, or a mixture of polymethyl methacrylate and polycarbonate.

[0056] The thickness of the insulating photoresist layer 3 is 2μm-8μm.

[0057] The metal mesh touchscreen of this invention optimizes manufacturing costs and device performance by limiting the thickness range of the insulating photoresist layer 3. On one hand, it avoids the situation where the insulating photoresist layer 3 is too thin, potentially failing to provide sufficient electrical isolation and easily leading to electrical breakdown, short circuits, or other electrical faults. On the other hand, it avoids the situation where the insulating photoresist layer 3 is too thick, resulting in a thick metal mesh touchscreen that is detrimental to the design of a thin and light display device. Furthermore, an excessively thick insulating layer may affect the heat conduction path, making it difficult to effectively dissipate heat from localized hot spots, thus affecting the reliability and lifespan of the device.

[0058] The cross-cut adhesion test value of the insulating photoresist layer 3 is greater than or equal to 5B. This means that the layer has relatively high adhesion. The cross-cut adhesion test is a commonly used method for testing coating adhesion. By forming a second sensing electrode layer 4 on the insulating photoresist layer 3, the test results are usually graded according to a standard from 0B to 5B, where 5B indicates that there is almost no coating peeling, indicating that the coating has very good adhesion.

[0059] The metal mesh touchscreen of this invention ensures that the insulating photoresist layer 3 tightly covers the first sensing electrode layer 2 by limiting the minimum adhesion value of the insulating photoresist layer 3, forming a robust integral structure. In subsequent manufacturing processes, such as etching or electroplating, good adhesion ensures that the insulating photoresist layer 3 will not easily peel off or be damaged, thereby reducing the defect rate in the production process of the second sensing electrode layer 4 and improving the quality of the finished product.

[0060] The insulating photoresist layer 3 is a transparent layer formed by coating and hardening a mixture of ethyl acetate and adhesive.

[0061] The transmittance of insulating photoresist layer 3 is greater than 90%.

[0062] The metal mesh touchscreen of this invention, by limiting the range of light transmittance of the insulating photoresist layer 3, achieves a high light transmittance (greater than 90%), meaning more light can pass through the insulating photoresist layer 3, thereby reducing the impact on the brightness and color performance of the display screen. This allows users to obtain a clearer, brighter, and more realistic visual experience. Simultaneously, by reducing light loss, it effectively reduces parallax problems caused by light refraction or reflection, contributing to a reduction in parallax.

[0063] The insulating photoresist layer 3 has a melting point greater than 200°C. This avoids the problem of the insulating photoresist layer 3's structure being damaged when the second sensing electrode layer 4 is sputtered onto the transparent photoresist layer due to its low melting point, which would lead to depletion of the insulating photoresist layer 3 and compromise the insulation between the second sensing electrode layer 4 and the first sensing electrode layer 2. The fact that the insulating photoresist layer 3's melting point is greater than 200°C allows it to withstand the instantaneous sputtering temperature also helps improve the overall safety of the metal mesh touchscreen.

[0064] The metal mesh touchscreen of this embodiment further includes a first metal pin (PIN end) and a plurality of first metal leads. Each first electrode strip 21 includes a first metal mesh area 211 and a first circuit connection area 212. Each first metal mesh area 211 is provided with a first pattern. The first circuit connection area 212 of each first electrode strip 21 is disposed on the edge of one side in a second direction. The plurality of first metal leads are connected one-to-one to the plurality of first circuit connection areas 212. The insulating photoresist layer 3 is provided with a clearance portion in the area of ​​the first circuit connection area 212. That is, the insulating photoresist layer 3 is not coated on the first circuit connection area 212.

[0065] The metal mesh touch screen of this invention has a clearance portion provided in the area of ​​the first circuit connection area 212 by the insulating photoresist layer 3. Since the PIN end needs to be bound to the FPC, it does not need to be coated with a photoresist layer for insulation.

[0066] The metal mesh touch screen of this embodiment of the invention further includes a second metal pin and a second metal lead. Each second electrode strip 41 includes a second metal mesh area 411 and a second circuit connection area 412. Each second metal mesh area 411 is provided with a second pattern. The second circuit connection area 412 of each second electrode strip 41 is disposed on the edge of one side in the first direction. Each second metal lead is connected between the second circuit connection area 412 and the second metal pin. The second metal pin is fixed on the light-transmitting substrate 1 or the insulating photoresist layer 3.

[0067] The first pattern is a cross-shaped pattern and / or a tic-tac-toe pattern. This can be understood as the first pattern being a cross-shaped pattern, the first pattern being a tic-tac-toe pattern, or the first pattern being both a cross-shaped pattern and a tic-tac-toe pattern.

[0068] The metal mesh touchscreen of this invention sets the first pattern as a cross-shaped pattern and / or a grid pattern. Both cross-shaped and grid patterns form a regular grid structure through intersections, providing a uniform electric field distribution across the entire touch area. This ensures consistent touch sensitivity at each location and helps reduce electromagnetic interference between adjacent electrodes, enabling the system to more accurately identify the touch position. This provides users with higher touch accuracy and better anti-interference capabilities.

[0069] The second pattern is a cross-shaped pattern and / or a tic-tac-toe pattern. It can be understood that the second pattern can be a cross-shaped pattern, a tic-tac-toe pattern, or both. Similarly, the metal mesh touchscreen of this embodiment has the advantages of improved touch accuracy and better anti-interference capabilities.

[0070] Each line that makes up the first pattern has an angle with each of the first and second directions.

[0071] Because if the lines of the metal mesh are aligned with or parallel to the direction of the display pixels, moiré patterns may occur. The metal mesh touchscreen of this embodiment effectively disperses these interference fringes by ensuring that each line forming the first pattern forms an angle with both the first and second directions, reducing or eliminating visual interference and thus improving the user's visual experience. Furthermore, setting the lines at a certain angle to the length and width directions of the sensing electrode layer allows for a more uniform distribution of sensing points on the touchscreen surface, avoiding touch blind spots or insensitive responses caused by overly concentrated sensing in certain areas. Therefore, the metal mesh touchscreen of this embodiment has the advantages of reducing visual interference and improving user experience.

[0072] Each line forming the second pattern forms an angle with each of the first and second directions. Similarly, this reduces or eliminates visual interference and enhances the user's visual experience.

[0073] The width of each line that makes up the first pattern is 2μm-7μm.

[0074] The metal mesh touchscreen of this invention, by limiting the width range of each line in the first pattern, avoids the problem of excessively wide lines blocking more light, leading to reduced overall screen brightness and deteriorated visual effects. Wider lines are also more prone to interference with the pixel arrangement of the display screen, resulting in more pronounced moiré patterns, especially on high-density pixel screens such as OLEDs. Conversely, it avoids excessively narrow lines, which would increase resistance, increase signal transmission loss, and affect touch response speed and stability. Furthermore, excessively thin lines are more prone to breakage under external force or thermal stress, especially during bending or drops, reducing reliability. Therefore, the metal mesh touchscreen of this invention has the advantages of improved display effect, high response stability, and high reliability.

[0075] Optionally, the width of each line constituting the first pattern can be 2μm, 3μm, 4μm, 5μm, 6μm or 7μm.

[0076] The width of each line constituting the second pattern is 2μm-7μm. Similarly, the metal mesh touchscreen of this embodiment of the invention has the advantages of improved display effect, high response stability, and high reliability.

[0077] Optionally, the width of each line that makes up the second pattern can be 2μm, 3μm, 4μm, 5μm, 6μm or 7μm.

[0078] The light-transmitting substrate 1 is a PET layer, and the thickness of the light-transmitting substrate 1 is 30μm-100μm.

[0079] The metal mesh touchscreen of this invention improves overall light transmittance by reducing light absorption and reflection losses when the light-transmitting substrate 1 passes through the substrate, through varying the thickness range of the substrate. On the one hand, an excessively thick light-transmitting substrate 1 would absorb and reflect more light, leading to a decrease in light transmittance and consequently affecting the brightness and color performance of the display screen, making the image appear less clear and bright than expected. On the other hand, for flexible or foldable devices, a thicker light-transmitting substrate 1 makes it difficult to achieve the required bending performance, limiting the design flexibility of the product and making it more prone to breakage or damage during bending.

[0080] On the other hand, it avoids the problem of insufficient structural strength caused by an excessively thin light-transmitting substrate 1. An excessively thin substrate 1 is prone to cracking or deformation under external force, reducing the product's durability and reliability. The extremely thin substrate places higher demands on the manufacturing process; for example, the control precision in photolithography and etching processes must be very high. Otherwise, problems such as broken lines and short circuits can easily occur, affecting product consistency and yield. Furthermore, a thinner conductive layer weakens resistance to external electromagnetic interference, potentially leading to an increase in accidental or missed contacts.

[0081] Furthermore, the thickness of the first sensing electrode layer is 400nm-1500nm.

[0082] The method for manufacturing a metal mesh touchscreen according to an embodiment of the present invention includes the following steps:

[0083] S1 forms a first coating on the first surface of the light-transmitting substrate 1, and presses a film on the first coating, and generates a cross-linking reaction between the film and the first coating by exposure.

[0084] S2 The laminate obtained in step S1 is sequentially etched by a weak alkaline solution (e.g., sodium bicarbonate solution, sodium hydroxide solution), an acidic etching solution, and a strong alkaline solution to form the first induction electrode layer 2.

[0085] S3 is formed by coating an insulating photoresist material onto the first sensing electrode layer 2, hardening and curing it to form an insulating photoresist layer 3, wherein the melting point of the insulating photoresist layer 3 is greater than 200℃.

[0086] S4 forms a second coating on the insulating photoresist layer 3, and forms a second sensing electrode layer 4 by lamination, exposure and etching on the second coating;

[0087] S5 coats the surface of the second sensing electrode layer 4 to form a coating layer 5.

[0088] Therefore, the metal mesh touch screen manufacturing method of this embodiment of the invention not only improves the etching quality of the second sensing electrode layer 4, but also reduces signal crosstalk and resolution.

[0089] For example, the method for manufacturing a metal mesh touchscreen according to an embodiment of the present invention includes the following steps:

[0090] 1) PET coating: PET roll is used as a light-transmitting substrate 1 and placed in a vacuum coating machine. While the copper target is energized with DC power in the cavity, argon gas is introduced for protection. Copper is sputtered onto the PET layer to form the first coating layer.

[0091] 2) Pressing: The photoresist film is pressed onto the first copper plating layer by high temperature and high pressure.

[0092] 3) Exposure: By irradiating parallel ultraviolet light, the pattern on the glass photomask is projected onto the first copper plating layer. The photoresist film will undergo a cross-linking reaction under ultraviolet light irradiation, thereby transferring the pattern on the glass photomask onto the lamination film (dry film).

[0093] 4) Etching: First, the dry film that is not exposed to light is dissolved by a weak alkaline solution, so the first copper plating layer will be exposed in the areas that are not exposed to light, while the exposed areas are protected by the dry film. Then, the exposed copper is removed by an acidic etching solution, leaving only the lines protected by the dry film. Finally, the dry film on the protected lines is cleaned away by a strong alkaline solution to form the first sensing electrode layer 2.

[0094] 5) Transparent photoresist coating and curing: The first sensing electrode layer 2 is coated with an insulating photoresist layer 3 to protect the etched lines. After curing, UV light or heating is used to cure and protect the photoresist coated on the lines.

[0095] 6) Photoresist coating: Cu is sputtered onto the insulating photoresist layer 3 by vacuum sputtering to form a second coating layer. (The hardened insulating photoresist layer 3 can withstand the instantaneous sputtering temperature of 200℃-400℃.)

[0096] 7) The second coating layer is sequentially laminated, exposed, and etched to form the second sensing electrode layer 4.

[0097] 8) Coating: A coating layer 5 is applied to the surface of the second sensing electrode layer 4 to prevent the circuit from being contaminated.

[0098] The touch module of this invention includes a metal mesh touch screen according to any one of the above claims.

[0099] Therefore, the touch module of this embodiment of the invention not only improves the etching quality of the second sensing electrode layer 4, but also reduces signal crosstalk and resolution.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0101] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0102] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0103] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0104] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0105] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A metal mesh touchscreen, characterized in that, include: A light-transmitting substrate, the light-transmitting substrate including a first surface and a second surface disposed opposite to each other along its thickness direction; The first sensing electrode layer, the insulating photoresist layer, and the second sensing electrode layer are sequentially stacked on the first surface. The first sensing electrode layer includes a plurality of first electrode strips spaced apart along a first direction, and the first electrode strips have a first pattern. The second sensing electrode layer includes a plurality of second electrode strips spaced apart along a second direction, and the second electrode strips have a second pattern. The lines forming the first pattern and the lines forming the second pattern are staggered in the thickness direction of the light-transmitting substrate. The insulating photoresist layer is a transparent layer formed by coating and hardening, and the hardness of the insulating photoresist layer is greater than or equal to 3H. The first direction and the second direction are perpendicular to each other. A shielding layer is disposed on the second surface.

2. The metal mesh touchscreen according to claim 1, characterized in that, The thickness of the insulating photoresist layer is 2μm-8μm; And / or, the cross-cut test value of the insulating photoresist layer is greater than or equal to 5B; And / or, the insulating photoresist layer is a transparent layer formed by coating and hardening a mixture of ethyl acetate and adhesive; And / or, the transmittance of the insulating photoresist layer is greater than 90%; And / or, the melting point of the insulating photoresist layer is greater than 200°C.

3. The metal mesh touchscreen according to claim 1, characterized in that, It also includes a first metal pin and a plurality of first metal leads. Each first electrode strip includes a first metal mesh area and a first circuit connection area. Each first metal mesh area is provided with the first pattern. The first circuit connection area of ​​each first electrode strip is located at the edge on one side of the second direction. The plurality of first metal leads are connected to the plurality of first circuit connection areas in a one-to-one correspondence. The insulating photoresist layer is provided with a clearance portion in the area of ​​the first circuit connection area.

4. The metal mesh touchscreen according to claim 1, characterized in that, It also includes a second metal pin and a second metal lead. Each second electrode strip includes a second metal mesh area and a second circuit connection area. Each second metal mesh area is provided with the second pattern. The second circuit connection area of ​​each second electrode strip is disposed on the edge of one side of the first direction. Each second metal lead is connected between the second circuit connection area and the second metal pin. The second metal pin is fixed on the light-transmitting substrate or the insulating photoresist layer.

5. The metal mesh touchscreen according to claim 1, characterized in that, The first pattern is a cross-shaped pattern and / or a grid pattern; The second pattern is a cross-shaped pattern and / or a grid-shaped pattern.

6. The metal mesh touchscreen according to claim 1, characterized in that, Each line constituting the first pattern forms an angle with each of the first direction and the second direction; each line constituting the second pattern forms an angle with each of the first direction and the second direction.

7. The metal mesh touchscreen according to claim 1, characterized in that, The width of each line that makes up the first pattern is 2μm-7μm; And / or, the width of each line constituting the second pattern is 2μm-7μm.

8. The metal mesh touchscreen according to claim 1, characterized in that, The light-transmitting substrate is a PET layer, and the thickness of the light-transmitting substrate is 30μm-100μm; And / or, the thickness of the first sensing electrode layer is 400nm-1500nm.

9. A method for manufacturing a metal mesh touchscreen as described in any one of claims 1-8, characterized in that, Includes the following steps: S1 forms a first coating on the first surface of the light-transmitting substrate, and presses a film onto the first coating. The film and the first coating are cross-linked by exposure to form a laminate. S2 The first coating layer is etched sequentially through a weak alkaline solution, an acidic etching solution, and a strong alkaline solution to form the first sensing electrode layer. S3 The insulating photoresist layer is formed by coating an insulating photoresist material onto the first sensing electrode layer, hardening and curing it, wherein the melting point of the insulating photoresist layer is greater than 200°C; S4 forms a second coating on the insulating photoresist layer, and forms the second sensing electrode layer by lamination, exposure and etching on the second coating layer; S5 coats the surface of the second sensing electrode layer to form a coating layer.

10. A touch module, characterized in that, Including the metal mesh touchscreen according to any one of claims 1-8.

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