Conductive film, metal grid touch screen sensor, touch module and preparation method thereof

Abstract

The embodiment of the invention provides a conductive film, a metal grid touch screen sensor, a touch module and a preparation method of the conductive film. The problem that in the prior art, a conductive film is prone to breakage after being bent for multiple times is solved. The conductive film includes a substrate layer, a first conductive layer, and a first outer blackening layer. The substrate layer is provided with a first surface and a second surface which are oppositely arranged along the thickness direction of the substrate layer; the first conductive layer comprises a plurality of first conductive sub-layers, the plurality of first conductive sub-layers are sequentially stacked on the first surface of the substrate layer, the thickness of each first conductive sub-layer is smaller than a first preset value, and the number of the first conductive sub-layers is larger than a second preset value; the first outer blackening layer is stacked on the first conductive sub-layer on the outermost layer. The touch module prepared from the conductive film provided by the embodiment of the invention has the advantages of good fracture resistance and high visual quality.

Description

Technical Field

[0001] The present invention relates to the technical field of conductive film materials, and in particular to a conductive film, a metal grid touch screen sensor and a touch module having the conductive film, and a method for preparing the touch module. Background Art

[0002] Metal mesh touchscreen sensors feature a conductive film containing a metallic conductive material on their surface. When a conductive object (a finger) touches the film, the surface capacitance at the point of contact changes due to the induction of current from the human body, allowing the touch point to be measured. Due to their fast response, high accuracy, and excellent display quality, they are gaining popularity among users. However, the conductive film used in flexible products can break after repeated bending over time, causing damage to the screen. Summary of the Invention

[0003] In view of this, the embodiments of the present invention are dedicated to providing a conductive film, a metal mesh touch screen sensor, a touch module and a preparation method thereof for mobile devices, so as to solve the problem in the prior art that the conductive film has poor bending resistance and is prone to breakage after multiple bending.

[0004] One aspect of the present invention provides a conductive film.

[0005] The present invention also provides a metal grid touch screen sensor.

[0006] The present invention also provides a touch module.

[0007] The present invention also provides a method for preparing a touch module.

[0008] The inventors have found that excessive thickness of the conductive layer of the conductive film can easily lead to the problem of the conductive film being broken.

[0009] The substrate layer has a first surface and a second surface arranged opposite to each other along its thickness direction; the first conductive layer includes a plurality of first conductive layers, and the plurality of first conductive layers are stacked in sequence on the first surface of the substrate layer, the thickness of each layer of the first conductive layer is less than a first preset value, and the number of layers of the first conductive layer is greater than a second preset value; the first outer blackened layer is a blackened layer formed after oxidation in a mixture of inert gas and oxygen, and the first outer blackened layer is stacked on the outermost layer of the first conductive layer.

[0010] The conductive film of the present invention embodiment divides the first conductive layer into multiple first conductive layers, and the thickness of each first conductive layer is less than a preset value, which is equivalent to thinning the conductive film. In other words, the multiple and thinned first conductive layers not only ensure a certain mechanical strength but also disperse stress, reducing fatigue damage to the first conductive layers during repeated bending, thereby improving the flexibility and fracture resistance of the entire conductive film. As a result, the service life of the display screen incorporating this conductive film is extended.

[0011] Furthermore, a first conductive layer with a thickness less than a preset value can reduce reflection and absorption of light as it passes through the conductive film, thereby improving the overall light transmittance of the conductive film. Higher light transmittance means a clearer, brighter display. Furthermore, the multi-layered first conductive layer structure can reduce or eliminate moiré patterns by adjusting the refractive index and thickness of each layer, further improving the visual quality of displays incorporating this conductive film.

[0012] The conductive film of the embodiment of the present invention has the advantages of good anti-fracture ability and high visual quality.

[0013] In one embodiment, the thickness of the first conductive layer is 480 nm to 1500 nm.

[0014] In one embodiment, the thickness of the first conductive layer is 80 nm to 150 nm.

[0015] In one embodiment, the number of the first conductive layer is 6-10.

[0016] In one embodiment, the first conductive layer is one of a metal copper layer, a metal zinc layer, and a metal aluminum layer.

[0017] In some embodiments, the vacuum degree is 10 -3 ~10 -6 Pa, in the process of forming the first conductive layer, a plurality of the first conductive layers and pre-blackening treatment layers are stacked in sequence by controlling the sputtering power to 2500W~3100W, in a mixture of inert gas and oxygen, wherein the volume ratio of the inert gas and oxygen is controlled to be 4~40:1, the pre-blackening treatment layer is oxidized to form the first outer blackening layer.

[0018] In some embodiments, the thicknesses of the plurality of first conductive layers are arranged to be equal or decreasing from the inside to the outside along the thickness direction of the substrate layer.

[0019] In some embodiments, the thickness of the first outer blackened layer is less than the thickness of the first conductive layer.

[0020] In some embodiments, the thickness of the first outer blackened layer is 20 nm to 60 nm.

[0021] In some embodiments, the first outer blackened layer is a composite structure of metal oxide and metal sub-oxide.

[0022] In some embodiments, the substrate layer is one of a polyimide film, a polycarbonate film, a polyethylene terephthalate film, a polyester plastic film, a polymethyl methacrylate film, and an epoxy plastic film.

[0023] In some embodiments, the substrate layer has a thickness of 20 μm to 100 μm.

[0024] In some embodiments, the conductive film further includes a first inner blackening layer, and the first inner blackening layer is disposed between the substrate layer and the innermost first conductive layer.

[0025] In some embodiments, the conductive film further includes a second conductive layer and a second outer blackened layer, and the second outer blackened layer and the second conductive layer are stacked on the second surface of the substrate layer.

[0026] In some embodiments, the second conductive layer includes a plurality of second conductive layers, and the plurality of second conductive layers are sequentially stacked on the second surface of the substrate layer. The thickness of the second conductive layer is greater than or equal to the thickness of the first conductive layer, and the second outer blackening layer is stacked on the outermost second conductive layer.

[0027] In some embodiments, the second conductive layer is 80 nm to 300 nm thick.

[0028] In some embodiments, the conductive film further includes a second inner blackening layer, and the second inner blackening layer is disposed between the substrate layer and the innermost second conductive layer.

[0029] The metal mesh touch screen sensor according to the embodiment of the present invention includes the conductive film according to any one of the above-mentioned methods.

[0030] The touch module of the embodiment of the present invention includes the sensor described above.

[0031] The method for preparing the touch module described above in the embodiment of the present invention comprises the following steps:

[0032] Disposing a photoresist material on the first outer blackened layer;

[0033] performing exposure and development processing on the photoresist material to form a patterned photoresist layer;

[0034] The grid conductive structure formed by the conductive film is etched to remove the patterned photoresist layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. 1 is a diagram showing the stacking layout of a conductive film according to an embodiment of the present invention.

[0036] Figure 2 FIG. 1 is a diagram showing the stacking layout of a conductive film according to another embodiment of the present invention.

[0037] Figure 3 FIG. 4 is a diagram showing the stacking layout of a conductive film according to another embodiment of the present invention.

[0038] Description of reference numerals:

[0039] substrate layer 1;

[0040] A first conductive layer 2;

[0041] First outer blackened layer 3;

[0042] First inner blackened layer 4;

[0043] A second conductive layer 5;

[0044] A second outer blackened layer 6;

[0045] The second inner blackened layer 7 . DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] Reference below Figure 1-Figure 3 , the conductive film, sensor, metal mesh touch screen sensor, touch module and their preparation methods of the embodiments of the present invention are described by way of example.

[0048] The conductive film of the embodiment of the present invention includes a substrate layer 1 , a first conductive layer and a first outer blackened layer 3 .

[0049] The substrate layer 1 is formed along the thickness direction of the substrate layer 1 (eg Figure 1 ) have a first surface (as shown in the up and down direction) arranged opposite to each other Figure 1 The upper end surface of the substrate layer 1 shown in FIG) and the second surface (as shown in FIG) Figure 1 ), the first conductive layer includes a plurality of first conductive layers 2, which are sequentially stacked on the first surface of the substrate layer 1, the thickness of each first conductive layer 2 is less than a first preset value, and the number of first conductive layers 2 is greater than a second preset value; the first outer blackened layer 3 is a blackened layer formed by oxidation in a mixture of an inert gas and oxygen, and the first outer blackened layer 3 is stacked on the outermost first conductive layer 2 (as shown in FIG. Figure 1 On the uppermost first conductive layer 2) shown in FIG.

[0050] The conductive film of the present invention embodiment divides the first conductive layer into multiple layers of first conductive layers 2, and sets the thickness of each first conductive layer 2 to be less than a preset value, which is equivalent to thinning the conductive film. In other words, the multi-layered and thinned first conductive layers 2 not only ensure a certain mechanical strength, but also disperse stress and reduce fatigue damage to the first conductive layers 2 during repeated bending, thereby improving the flexibility and fracture resistance of the entire conductive film. As a result, the service life of the display screen equipped with this conductive film is extended (more than double the bending life of existing metal mesh sensors).

[0051] Furthermore, the first conductive layer 2, which is thinner than a predetermined thickness, reduces reflection and absorption of light as it passes through the conductive film, thereby improving overall light transmittance. Higher light transmittance translates to a clearer, brighter display. Furthermore, the multi-layered first conductive layer structure can reduce or eliminate moiré (interference fringes) by adjusting the refractive index and thickness of each layer, thereby improving the visual quality of displays incorporating this conductive film.

[0052] The touch module made of the conductive film of the embodiment of the present invention has the advantages of good anti-fracture ability and high visual quality.

[0053] The thickness of the first conductive layer is 480 nm to 1500 nm.

[0054] The conductive film of the present invention, by limiting the thickness range of the first conductive layer, avoids problems such as cracks or breakage in the first conductive layer caused by excessive thickness. Furthermore, excessive thickness of the first conductive layer can cause it to absorb and reflect more light, resulting in reduced transmittance and color shift, leading to poor clarity and color distortion. Therefore, by controlling the thickness of the first conductive layer within a reasonable range, the conductive film of the present invention further enhances the fracture resistance of the touch module and improves the visual quality of the film.

[0055] On the other hand, the conductive film of the embodiment of the present invention also avoids the thickness of the first conductive layer being too small, which will result in low mechanical strength of the conductive film and easy damage during installation or use. At the same time, the first conductive layer is more likely to suffer fatigue damage when repeatedly bent or subjected to force, shortening its service life. In addition, although a thin conductive layer helps to improve light transmittance, if the thickness is too small, it cannot effectively shield external electromagnetic interference, which will also affect the display quality. Therefore, the conductive film of the embodiment of the present invention has the advantages of further improving the anti-fracture ability of the touch module of the conductive film and improving the visual quality by controlling the thickness of the first conductive layer within a reasonable range.

[0056] Optionally, the thickness of the first conductive layer is 480nm, 485nm, 498nm, 500nm, 510nm, 515nm, 520nm, 530nm, 535nm, 550nm, 560nm, 569nm, 581nm, 590nm, 612nm, 620nm, 629nm, 635nm, 640nm, 647nm, 656nm, 667nm, 680nm, 700nm, 710nm, 715nm, 720nm, 730nm, 740nm, 750nm, 760nm, 770nm, 800nm, 810nm m, 815nm, 820nm, 830nm, 840nm, 850nm, 860nm, 870nm, 900nm, 910nm, 915nm, 920nm, 930nm, 935nm, 950nm, 960nm, 969nm, 981nm, 990 nm, 1000nm, 1010nm, 1020nm, 1050nm, 1100nm, 1120nm, 1150nm, 1200nm, 1250nm, 1330nm, 1400nm, 1420nm, 1450nm, 1480nm, 1500nm.

[0057] The thickness of the first conductive layer 2 is 80 nm to 150 nm (in the related art, for example, the thickness of the first conductive layer 2 may be 300 nm).

[0058] By limiting the thickness range of the first conductive layer 2, the conductive film of the present invention avoids excessive thickness of the first conductive layer 2 in a single layer. An excessively thick first conductive layer 2 is more susceptible to cracking or breaking, which could affect the device's service life and reliability. Furthermore, this further avoids the problems of decreased light transmittance and color shift resulting from excessive light absorption and reflection by the conductive layer, leading to poor clarity and color distortion. Thus, by controlling the thickness of the first conductive layer 2 within a reasonable range, the conductive film of the present invention further enhances the fracture resistance and visual quality of the touch module incorporating the conductive film.

[0059] On the other hand, while a thin first conductive layer 2 helps improve light transmittance, if the thickness is too thin, it cannot effectively shield external electromagnetic interference, thus affecting display quality. Furthermore, an excessively thin first conductive layer 2 has low mechanical strength and is easily damaged during installation or use, shortening its service life, especially in applications requiring high durability (such as industrial displays).

[0060] Alternatively, the thickness of the first conductive layer 2 may be 80 nm, 84 nm, 89 nm, 95 nm, 100 nm, 105 nm, 113 nm, 120 nm, 122 nm, 125 nm, 128 nm, 130 nm, 133 nm, 135 nm, 138 nm, 140 nm, 142 nm, 145 nm, 147 nm, and 150 nm.

[0061] Furthermore, the number of the first conductive layer 2 is 6-10.

[0062] By limiting the number of first conductive layers 2, the conductive film of the present invention avoids the problem of an excessive number of first conductive layers 2 increasing the total thickness of the first conductive layer, which would result in more light absorption and reflection, thereby reducing the overall light transmittance and affecting the display quality. Excessive first conductive layers 2 would cause the conductive film to become thicker and harder, making it more susceptible to delamination or fracture. Therefore, by controlling the number of first conductive layers 2 within a reasonable range, the conductive film of the present invention further enhances the fracture resistance and visual quality of the touch module.

[0063] On the other hand, too few first conductive layers 2 may result in insufficient overall mechanical strength of the conductive film, and may also be more susceptible to fatigue damage when repeatedly bent or subjected to stress, shortening the service life of the entire display screen.

[0064] Optionally, the number of layers of the first conductive layer 2 may be 6, 7, 8, 9 or 10. For example, Figure 1 As shown in FIG, the first conductive layer 2 has 6 layers.

[0065] Optionally, the thickness of the first conductive layer 2 is 80 nm to 150 nm, and the number of layers of the first conductive layer 2 is 6 to 10. Furthermore, properly selecting and controlling the number and thickness of the first conductive layer 2 further enhances the fracture resistance of the touch module of the conductive film and improves the visual quality.

[0066] The first conductive layer 2 is one of a metal copper layer, a metal zinc layer, and a metal aluminum layer. Thus, by controlling the material of the first conductive layer 2, the anti-fracture capability can be taken into account while reducing the material cost of the conductive film.

[0067] At a vacuum degree of 10 -3 ~10 -6Pa, in the first conductive layer forming process, by controlling the sputtering power to be 2500W~3100W (in the related art, the sputtering power is generally 5500W), a plurality of first conductive layers 2 and pre-blackening treatment layers are stacked in sequence, in a mixture of nitrogen and oxygen, wherein the volume ratio of nitrogen and oxygen is controlled to be 40:1, the pre-blackening treatment layer is oxidized to form a first outer blackening layer 3.

[0068] The conductive film of the embodiment of the present invention, by limiting the range of the sputtering power to 2500W to 3100W, can ensure that the first conductive layer 2 has a high conductivity while ensuring the preset thickness of the first conductive layer 2 and reducing the interface scattering effect by precisely controlling the sputtering power. Moreover, under this sputtering power, a more uniform deposition rate can be provided, the thickness consistency of the first conductive layer 2 can be improved, and the problems of uneven current distribution and local overheating caused by the unevenness of the first conductive layer 2 can be avoided. Therefore, the conductive film of the embodiment of the present invention has the advantage of improving the uniformity of the first conductive layer 2 by controlling the sputtering power within a reasonable range. In addition, low-power sputtering can better control the film growth process at the atomic level, thereby forming a denser structure, reducing porosity, and improving the mechanical strength and corrosion resistance of the film.

[0069] In a mixed gas with a volume ratio of nitrogen to oxygen of 40:1, the pre-blackened layer is oxidized to form a first outer blackened layer 3 .

[0070] In the conductive film of the present invention, when forming the first outer blackened layer 3, nitrogen is partially replaced with oxygen. This nitrogen addition to oxygen modifies the stable chemical bond structure within the blackened layer, thereby adjusting its absorption characteristics for specific wavelengths of light and reducing surface reflectivity, enabling the blackened layer to achieve higher absorptivity across a wider spectral range. Furthermore, this ratio of nitrogen and oxygen introduces additional free electrons or holes, increasing the carrier density of the blackened layer and forming a more uniform and continuous conductive network, thereby improving its conductivity.

[0071] Furthermore, nitrogen atoms are smaller than oxygen atoms and are more easily embedded in the material lattice, forming more stable chemical bonds and promoting interdiffusion between atoms at the interface, creating a tighter transition zone. This structural change can enhance the hardness and wear resistance of the blackened layer, extending its service life and fatigue strength.

[0072] The first outer blackened layer 3 of the conductive film of the embodiment of the present invention can also be formed in a mixed gas with a volume ratio of argon to oxygen of 4:1.

[0073] Specifically, the processing of the conductive film according to the embodiment of the present invention includes the following steps:

[0074] S1 Substrate Pretreatment: Ultrasonic cleaning removes surface oil and contaminants, and plasma treatment or chemical etching enhances surface activity. The substrate is placed on a carrier within a vacuum chamber to ensure uniform deposition.

[0075] S2 vacuum environment establishment: vacuum to 10 -3 ~10 -6 Pa, excludes oxygen and moisture, and prevents copper oxidation.

[0076] S3 copper target excitation: Inert gas - argon is introduced, and a high voltage electric field is applied to make argon ions bombard the copper target, sputtering out copper atoms, which are then deposited onto the substrate surface under the guidance of the electric or magnetic field.

[0077] S4 coating deposition control: Control the copper layer thickness by adjusting parameters such as sputtering power, gas pressure, and deposition time.

[0078] S5 Blackened surface: Fill with oxygen and nitrogen to oxidize the copper and then deposit it on the surface and bottom of the copper layer for blackening.

[0079] In some embodiments, the thicknesses of the plurality of first conductive layers 2 are arranged to decrease gradually from the inside to the outside along the thickness direction of the substrate layer 1 .

[0080] Tests have shown that the outermost first conductive layer is most susceptible to damage. The conductive film of the present invention, with the thickness of the multiple first conductive layers 2 decreasing from the inside to the outside along the thickness of the substrate layer 1, further enhances the flexibility and bending resistance of the conductive film while maintaining a certain level of mechanical strength. This further reduces fatigue damage to the outermost first conductive layer 2 during repeated bending, thereby extending the service life of the display screen incorporating this conductive film.

[0081] For example, the thickness of the plurality of first conductive layers 2 is set to decrease gradually from the inside to the outside along the thickness direction of the substrate layer 1 by 5 nm, 6 nm, 7 nm or 9 nm.

[0082] The present invention is not limited thereto. In other embodiments, the thicknesses of the plurality of first conductive layers 2 are arranged to be uniform from the inside to the outside along the thickness direction of the substrate layer 1. Thus, the uniform thickness of the first conductive layers 2 has the advantage of high processing convenience.

[0083] The thickness of the first outer blackened layer 3 is smaller than the thickness of the first conductive layer 2 , and the thickness of the first outer blackened layer 3 is 20 nm to 60 nm.

[0084] The conductive film of the embodiment of the present invention controls the thickness of the first outer blackened layer 3 to be smaller than the thickness of the first conductive layer 2. When the overall thickness of the conductive film is constant, the thinner blackened layer can better combine with the adjacent first conductive layer 2, helping to promote the mutual diffusion of atoms at the interface, forming a stronger interfacial adhesion, and reducing the risk of delamination or peeling of the blackened layer. As a result, the integrity of the conductive film is improved. At the same time, a relatively thin blackened layer is set in the touch module, which absorbs and reflects less light, thereby allowing more light to pass through the entire conductive film, thereby helping to further improve the display brightness and clarity of the touch module. As a result, the conductive film of the embodiment of the present invention improves the structural integrity and display effect of the touch module.

[0085] Furthermore, by limiting the thickness range of the first outer blackened layer 3, the color shift problem caused by different degrees of refraction, reflection and absorption of light of different wavelengths when passing through the material can be reduced, the color difference can be reduced, and the color difference can be further reduced, thereby further reducing the color difference and improving the display effect.

[0086] Optionally, the thickness of the first outer blackened layer 3 is 20 nm, 22 nm, 25 nm, 28 nm, 30 nm, 33 nm, 35 nm, 38 nm, 40 nm, 42 nm, 45 nm, 47 nm, 50 nm, 53 nm, 55 nm, 57 nm, 58 nm and 60 nm.

[0087] The first outer blackened layer 3 is a composite structure of metal oxide and metal sub-oxide.

[0088] For example, the oxide layer includes a composite structure of CuO and Cu2O. The crystal structure of CuO and Cu2O is relatively stable, providing high hardness and wear resistance. This property helps prevent failure of the blackened layer due to friction or wear, especially when used in dynamic environments. At the same time, the composite structure formed by CuO and Cu2O can better resist fatigue damage under repeated stress and extend service life. The heterojunction interface between CuO and Cu2O can form an effective carrier transport channel, reducing the resistance caused by interface defects and further improving conductivity efficiency.

[0089] The substrate layer 1 can be made of a polyimide film, a polycarbonate film, a polyethylene terephthalate film, a polyester plastic film, a polymethyl methacrylate film, or an epoxy plastic film. Furthermore, the substrate layer 1 is a modified polyimide film. This material and thickness of the substrate layer 1 improves folding resistance and surface smoothness.

[0090] In some embodiments, the thickness of the substrate layer 1 may be 20 μm to 100 μm. Further, the thickness of the substrate layer 1 may be 30 μm to 50 μm.

[0091] The conductive film of the present invention controls the thickness of the substrate layer 1 to avoid the problem that a thicker substrate layer 1 is generally stiffer and more susceptible to cracking or breaking during repeated bending, which could affect the lifespan and reliability of the device. Furthermore, an excessively thin substrate layer 1 has lower mechanical strength and is easily damaged during installation or use, resulting in warping or other deformation, which could affect the performance of the final product.

[0092] Optionally, the thickness of the substrate layer 1 may be 30 μm, 32 μm, 33 μm, 35 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, and 50 μm.

[0093] like Figure 2 As shown, the conductive film of the embodiment of the present invention further includes a first inner blackened layer 4 , which is arranged between the substrate layer 1 and the innermost first conductive layer 2 along the thickness direction of the conductive film.

[0094] The conductive film of the embodiment of the present invention is provided by arranging the first inner blackening layer 4 between the substrate layer 1 and the innermost first conductive layer 2 along the thickness direction of the conductive film. Since the first inner blackening layer 4 generally has a high absorptivity and a low reflectivity, it can form an effective anti-reflection interface between the substrate layer 1 and the first conductive layer 2, thereby reducing the reflection loss of light, thereby improving the overall light transmittance, thereby improving the contrast of the display device, and making the image clearer and more vivid. In addition, the provided first inner blackening layer 4 can provide a more uniform transition area between the substrate layer 1 and the conductive layer, helping to achieve a more uniform current distribution, preventing the occurrence of local overheating, and extending the service life of the device. Therefore, the conductive film of the embodiment of the present invention helps to improve the display effect of the touch module and extend the service life.

[0095] like Figures 1 to 3 As shown, the conductive film of the embodiment of the present invention further includes a second conductive layer and a second outer blackened layer 6 , and the second outer blackened layer 6 and the second conductive layer are stacked on the second surface of the substrate layer 1 .

[0096] The conductive film of the present invention embodiment, by providing a second conductive layer on the second surface of substrate layer 1, can achieve bidirectional current transmission by providing conductive layers on both sides of substrate layer 1. This allows current to enter or exit the device from either side, increasing design flexibility and application diversity. The double-sided conductive layer helps achieve more uniform current distribution, avoiding localized overheating caused by current concentration in a single area, and extending the service life of the device. Furthermore, providing conductive layers on both sides of substrate layer 1 significantly improves the mechanical strength of the entire assembly, thereby enhancing its bending resistance and durability, and further reducing the risk of fracture.

[0097] Optionally, the thickness of the second conductive layer 5 is 80 nm to 300 nm.

[0098] For example, the thickness of the second conductive layer 5 can be 80nm, 82nm, 85nm, 88nm, 90nm, 92nm, 95nm, 98nm, 100nm, 102nm, 105nm, 108nm, 110nm, 112nm, 115nm, 118nm, 120nm, 122nm, 125nm, 128nm, 130nm, 133nm, 135nm, 138nm, 140nm, 142nm, 145nm, 147nm, 150nm, 160nm, 170nm, 180nm, 190nm, 200nm, 210nm, 220nm, 230nm, 240nm, 250nm, 260nm, 270nm, 280nm, 290nm or 300nm.

[0099] like Figures 1 to 3 As shown, the conductive film of the embodiment of the present invention further includes a second inner black layer 7, which is disposed between the substrate layer 1 and the innermost second conductive layer 5. Similarly, this prevents cracking or damage caused by excessive local stress, thereby improving the reliability of the entire conductive film structure.

[0100] Optionally, the first conductive layer is a metal copper layer structure, the substrate layer 1 is a high-temperature resistant polyester film (PET film), and the first outer blackened layer 3, the first inner blackened layer 4, the second outer blackened layer 6 and the second inner blackened layer 7 can all be a composite structure of CuO and Cu2O after oxidation of the metal copper layer.

[0101] The thickness of the first inner blackened layer 4 , the thickness of the first outer blackened layer 3 , the thickness of the second outer blackened layer 6 , and the thickness of the second inner blackened layer 7 can be set to be consistent.

[0102] Dynamic bending tests are conducted in accordance with the current Chinese standard IEC 62715-6-1:2018. The bending radius is 2.5mm, the number of cycles is 10 seconds per cycle, and the movement speed is 10 seconds per cycle. The low-resistance tester utilizes a precise four-wire measurement circuit, a high-performance power supply, and an intelligent control unit, combined with anti-interference design and data management features, to achieve a wide range of measurements from micro-ohms to mega-ohms. If the resistance change rate of the bent sample exceeds 10% of the full resistance change during bending, the bent sample is deemed to have failed. The test structure shows that in test group 1, the first conductive layer had 6 layers, a single layer had a thickness of 1000nm, and was symmetrical on the front and back surfaces; in test group 2, the first conductive layer had 8 layers, a single layer had a thickness of 800nm, and was symmetrical on the front and back surfaces; in the control group, the first conductive layer had 3 layers, a single layer had a thickness of 2000nm, and was symmetrical on the front and back surfaces. The wire-out area was the trace. The grid conductive structure can be used on curved screens, especially when the trace needs to be repeatedly folded during disassembly and repair. The bending life of this part of the sensor produced in the related art is usually about 20 times, which leads to the problem of fracture in this area. The copper film in test group 1 still had a resistance change of less than 10% after 10,000 measurements. To save time, subsequent measurements were not continued.

[0103]

[0104] As can be seen from the superscripts, the metal mesh touch screen sensor according to the embodiment of the present invention has the advantage of good anti-bending capability.

[0105] The metal mesh touch screen sensor of the embodiment of the present invention comprises the conductive film according to any one of the above items. The metal mesh touch screen sensor of the embodiment of the present invention has the advantages of anti-breakage capability and improved visual quality.

[0106] The method for preparing a touch module according to an embodiment of the present invention includes the following steps:

[0107] Disposing a photoresist material on the first outer blackened layer 3;

[0108] performing exposure and development processing on the photoresist material to form a patterned photoresist layer;

[0109] The grid conductive structure formed by the conductive film is etched to remove the patterned photoresist layer.

[0110] The method for preparing the touch module according to the embodiment of the present invention has the advantages of anti-fracture capability and improved visual quality.

[0111] Optionally, the sheet resistance of the metal mesh touch screen sensor obtained in this manner is 0.08Ω / Sq to 0.15Ω / Sq.

[0112] 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 in the scope of protection of the present invention.

[0113] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0114] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0115] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0116] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0117] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0118] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A conductive film, characterized in that include a substrate layer, wherein the substrate layer has a first surface and a second surface opposite to each other along a thickness direction thereof; a first conductive layer, the first conductive layer comprising a plurality of first conductive layers, the plurality of first conductive layers being sequentially stacked on the first surface of the substrate layer, the thickness of each first conductive layer being less than a first preset value, and the number of first conductive layers being greater than a second preset value; The first outer black layer is formed by oxidation in a mixture of an inert gas and oxygen, and is stacked on the outermost first conductive layer.

2. The conductive film according to claim 1, wherein The thickness of the first conductive layer is 480 nm to 1500 nm; And / or, the thickness of the first conductive layer is 80 nm to 150 nm; And / or, the number of layers of the first conductive layer is 6 to 10; And / or, the first conductive layer is one of a metal copper layer, a metal zinc layer and a metal aluminum layer.

3. The conductive film according to claim 1, wherein At a vacuum degree of 10 -3 ~10 -6 Pa, in the first conductive layer forming step, a plurality of first conductive layers and a pre-blackening treatment layer are sequentially stacked by controlling the sputtering power to be 2500W to 3100W; in a mixture of inert gas and oxygen, wherein the volume ratio of the inert gas to oxygen is controlled to be 4 to 40:1, the pre-blackening treatment layer is oxidized to form the first outer blackening layer; And / or, the thicknesses of the plurality of first conductive layers are arranged to be equal or decreasing from the inside to the outside along the thickness direction of the substrate layer.

4. The conductive film according to claim 1, wherein The thickness of the first outer blackened layer is less than the thickness of the first conductive layer; and / or, the thickness of the first outer blackened layer is 20 nm to 60 nm; And / or, the first outer blackened layer is a composite structure of metal oxide and metal sub-oxide.

5. The conductive film according to claim 1, wherein The substrate layer is one of polyimide film, polycarbonate film, polyethylene terephthalate film, polyester plastic film, polymethyl methacrylate film, and epoxy plastic film; and / or, the thickness of the substrate layer is 20 μm to 100 μm; And / or, it further includes a first inner blackening layer, wherein the first inner blackening layer is arranged between the substrate layer and the innermost first conductive layer. The conductive film according to claim 1 , wherein: It also includes a second conductive layer and a second outer black layer, and the second outer black layer and the second conductive layer are stacked in sequence on the second surface of the substrate layer.

7. The conductive film according to claim 6, wherein The second conductive layer includes a plurality of second conductive layers, the plurality of second conductive layers are sequentially stacked on the second surface of the substrate layer, the thickness of the second conductive layers is greater than or equal to the thickness of the first conductive layers, and the second outer blackened layer is stacked on the outermost second conductive layer; and / or, the second conductive layer is 80 nm to 300 nm; And / or, further comprising a second inner blackening layer, wherein the second inner blackening layer is disposed between the substrate layer and the innermost second conductive layer.

8. A metal mesh touch screen sensor, characterized in that: The conductive film comprises the conductive film according to any one of claims 1 to 7.

9. A touch module, characterized in that: Comprising a sensor according to claim 8.

10. A method for preparing the touch module according to claim 9, characterized in that: The steps include: Disposing a photoresist material on the first outer blackened layer; performing exposure and development processing on the photoresist material to form a patterned photoresist layer; The grid conductive structure formed by the conductive film is etched to remove the patterned photoresist layer.

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