Color touch sensing film on flexible substrate

Abstract

The present invention provides a color touch sensor film on a flexible substrate, comprising a flexible substrate, an indium tin oxide (ITO) conductive layer provided on the flexible substrate, a non-conductive inorganic material film layer provided between the flexible substrate and the ITO conductive layer, conductive ink columns printed and fixed on the ITO conductive layer, an insulating ink layer 1 printed on the ITO conductive layer outside the conductive ink columns, a silver paste conductive layer fixedly printed on the insulating ink layer 1, and an insulating ink layer 2 fixedly printed on the silver paste conductive layer; a color layer fixedly printed on the insulating ink layer 2; an optically transparent adhesive layer and a protective layer fixed in sequence outside the color layer; the insulating ink layer 1 and the insulating ink layer 2 are both made of UV-curable insulating ink; in the color touch sensor film of the present invention, the color layer has good visual clarity, the insulating ink has strong adhesion, and the color touch sensor film has good overall stability.

Description

Technical Field

[0001] The present invention relates to the technical field of touch films, and in particular to a color touch sensor film on a flexible substrate. Background Art

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

[0003] The touch sensor film is a key component of touch screens and plays a vital role in touchscreen systems. Its primary function is to sense user touch. When a user touches the screen, the film detects the location and force of the touch and converts this information into an electrical signal.

[0004] With the widespread application of touch screen technology, the demand for touch sensor films with high sensitivity and color display functions is growing.

[0005] Current touch sensor films generally lack a colored logo layer. Some existing colored touch sensor films are first printed to create a transparent touch sensor film, and then a colored cover layer is laminated to the touch sensor film. Because the touch sensor film and the colored cover layer are processed separately, the dimensions of the colored cover layer and the touch sensor film are inevitably offset during this process. Consequently, after the colored cover layer and the touch sensor film are laminated, the colored cover layer may deviate from the control portion within the touch sensor film, affecting touch stability.

[0006] Domestic patent application number 202111329144.8 discloses a flexible touch-sensitive functional film with a color display. The film comprises a thin film base, a color layer fixedly printed on one side of the film base, an etched circuit layer printed on the other side of the film base, multiple carbon paste layers printed on the etched circuit layer, a first insulating layer printed on the etched circuit layer outside the carbon paste layer, a silver paste layer fixedly printed on the side of the first insulating layer away from the etched circuit layer, the silver paste layer electrically contacting the carbon paste layer, and a second insulating layer fixedly printed on the side of the silver paste layer away from the first insulating layer. The color layer of the touch button is directly printed on one side of the film base, and the corresponding etched circuit layer, carbon paste layer, and silver paste layer are printed in sequence on the other side. This makes integrated processing more convenient, and the printing of the etched circuit layer, carbon paste layer, and silver paste layer directly corresponds to the color layer, ensuring the accuracy of the button position and the corresponding circuit.

[0007] The above technical solution effectively solves the problem of potential misalignment between the colored overlay layer and the control portion within the touch sensor film. However, because the colored layer is positioned on the side of the film base away from the etched circuit layer, the clarity of the colored layer can be affected by the obstruction of the film base, etched circuit layer, carbon paste layer, and silver paste layer. Furthermore, the production of the colored touch sensor film requires the use of insulating ink to create the insulating ink layer. However, current insulating inks often suffer from insufficient adhesion, which can easily affect the quality of the colored touch sensor film. Summary of the Invention

[0008] The object of the present invention is to provide a color touch sensor film on a flexible substrate, wherein the color layer has good visual clarity, the insulating ink has strong adhesion, and the color touch sensor film has good overall stability.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A color touch sensor film on a flexible substrate comprises a flexible substrate, wherein an ITO conductive layer is provided on the flexible substrate, a plurality of conductive ink pillars are printed and fixed on the ITO conductive layer, an insulating ink layer 1 is printed on the ITO conductive layer outside the plurality of conductive ink pillars, the thickness of the insulating ink layer 1 is adapted to the height of the conductive ink pillars, and the insulating ink layer 1 corresponding to the conductive ink pillars is provided with openings matching the conductive ink pillars; a silver paste conductive layer is fixedly printed on the insulating ink layer 1, and a second insulating ink layer is fixedly printed on the silver paste conductive layer, characterized in that a non-conductive inorganic material film layer is provided between the flexible substrate and the ITO conductive layer, a color layer is fixedly printed on the second insulating ink layer, and an optically transparent adhesive layer and a protective layer are fixed to the outside of the color layer in sequence;

[0011] The first insulating ink layer and the second insulating ink layer are both made of UV-curable insulating ink; the UV-curable insulating ink is made of the following raw materials in weight percentage: 7-11% liquid bisphenol A epoxy resin, 5-10% active diluent, 10-15% filler, 3-5% photoinitiator, and the balance is acrylic resin.

[0012] Preferably, the reactive diluent is composed of isobornyl methacrylate, tetrahydrofuran methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 2-5:1-2:1-2:1-2.

[0013] Preferably, the filler is composed of talc powder and fumed silica in a mass ratio of 2-5:1.

[0014] Preferably, the liquid bisphenol A epoxy resin is epoxy resin E-51 or epoxy resin E-51;

[0015] The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1-2:2-3.

[0016] Preferably, the non-conductive inorganic material film layer includes a first SO2 layer fixedly connected to the flexible substrate, and a Si3N4 layer and a second SO2 layer are sequentially fixed outside the first SO2 layer.

[0017] Preferably, the thickness of the first SO2 layer is 25-35 nm; the thickness of the Si3N4 layer is 15-25 nm; and the thickness of the second SO2 layer is 15-25 nm.

[0018] The first SO2 layer, the Si3N4 layer and the second SO2 layer are all prepared by magnetron sputtering.

[0019] Preferably, the flexible substrate is polyethylene terephthalate, and the protective layer 10 is polycarbonate.

[0020] Preferably, the thickness of the ITO conductive layer is 45-55 nm, the thickness of the conductive ink column is 40-65 μm, and the thickness of the silver paste conductive layer is 5-10 μm.

[0021] Preferably, the thickness of the flexible substrate is 100-120 μm;

[0022] The thickness of the second insulating ink layer is 20-30 μm

[0023] The thickness of the color layer is 10-16 μm;

[0024] The thickness of the optically transparent adhesive layer is 15-20 μm;

[0025] The thickness of the protective layer is 30-50 μm.

[0026] Preferably, the method for preparing the color touch sensor film comprises the following steps:

[0027] S1: sequentially magnetron sputtering a non-conductive inorganic material film layer and an ITO film layer on a flexible substrate, and then etching the ITO film layer to obtain an ITO conductive layer forming a predetermined conductive pattern;

[0028] Printing and fixing a plurality of conductive ink columns on the ITO conductive layer, then printing UV curable insulating ink on the ITO conductive layer outside the plurality of conductive ink columns, and obtaining an insulating ink layer 1 after UV curing;

[0029] Printing conductive silver paste on the first insulating ink layer and curing it to obtain a silver paste conductive layer; printing UV curable insulating ink on the silver paste conductive layer and curing it with ultraviolet light to obtain a second insulating ink layer, thereby obtaining a touch sensor film body;

[0030] S2: placing the touch sensor film body in a UV color printer, printing color ink on the second insulating ink layer of the touch sensor film body to form a color layer; and bonding the protective layer to the color layer through an optically transparent adhesive layer.

[0031] The beneficial effects of the present invention are:

[0032] 1. In the color touch sensor film of the present invention, a color layer is fixedly printed on the second insulating ink layer, and an optically transparent adhesive layer and a protective layer are fixed to the outside of the color layer in sequence. The color layer is disposed on the outer layer of the color touch sensor film and is fixedly printed on the acrylic resin-based insulating ink layer. This provides a good printing effect and improves the visual clarity of the color layer.

[0033] 2. The insulating ink layer of the present invention adopts UV curing insulating ink. In this ink, acrylic resin is used as the main resin, and an appropriate amount of liquid bisphenol A epoxy resin is added. The two have good compatibility. Combined with an active diluent composed of isobornyl methacrylate, tetrahydrofuran methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate, after the curing reaction, a more stable interpenetrating network structure and rich groups can be formed, which can make it have better adhesion with color inks, silver paste conductive layers, ITO conductive layers, etc., and at the same time, the overall gloss and flexibility are better.

[0034] 3. The non-conductive inorganic material film layer in the color touch sensor film of the present invention includes an SO2 layer 1, a Si3N4 layer, and an SO2 layer 2, which are fixedly connected to the flexible substrate in sequence. On the one hand, it effectively reduces the impact of the ITO film layer etching process on the flexible substrate. On the other hand, it can make the optical effect better and have higher stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the structure of the color touch sensor film on the flexible substrate of the present invention;

[0037] Figure 2Schematic diagram of the structure of the non-conductive inorganic material film layer of the present invention.

[0038] In the figure: 1. Flexible substrate; 2. Non-conductive inorganic material film layer; 21. SO2 layer 1; 22. Si3N4 layer; 23. SO2 layer 2; 3. ITO conductive layer; 4. Conductive ink column; 5. Insulating ink layer 1; 6. Silver paste conductive layer; 7. Insulating ink layer 2; 8. Color layer; 9. Optically transparent adhesive layer; 10. Protective layer. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention. Example 1:

[0040] A color touch sensing film on a flexible substrate, such as Figure 1-2 As shown, it includes a flexible substrate 1, a non-conductive inorganic material film layer 2 is provided on the flexible substrate 1 (magnetron sputtering), an ITO conductive layer 3 is provided on the non-conductive inorganic material film layer 2 (magnetron sputtering), a plurality of conductive ink pillars 4 are printed and fixed on the ITO conductive layer 3, an insulating ink layer 1 5 is printed on the ITO conductive layer 3 outside the plurality of conductive ink pillars 4, the thickness of the insulating ink layer 1 5 is adapted to the height of the conductive ink pillars 4, and openings matching the conductive ink pillars 4 are provided on the insulating ink layer 1 5 corresponding to the conductive ink pillars 4; a silver paste conductive layer 6 is fixedly printed on the insulating ink layer 1 5, and an insulating ink layer 2 7 is fixedly printed on the silver paste conductive layer 6;

[0041] A color layer 8 is fixedly printed on the second insulating ink layer 7 ; an optically transparent adhesive layer 9 and a protective layer 10 are fixed in sequence outside the color layer 8 .

[0042] The insulating ink layer 1 5 and the insulating ink layer 2 7 are both made of UV curing insulating ink; the UV curing insulating ink is made of the following raw materials in percentage by weight: 10% epoxy resin E-51, 8% reactive diluent, 12% filler, 5% photoinitiator, and the balance is acrylic resin.

[0043] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 5:2:1:1. The filler is composed of talc and fumed silica in a mass ratio of 3:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1:2.

[0044] The non-conductive inorganic material film layer 2 includes an SO2 layer 1 21 fixedly connected to the flexible substrate 1. Furthermore, a Si3N4 layer 22 and a second SO2 layer 23 are fixed to the SO2 layer 1 21. The thickness of the SO2 layer 1 21 is 30 nm; the thickness of the Si3N4 layer 22 is 17 nm; and the thickness of the SO2 layer 23 is 22 nm.

[0045] The flexible substrate 1 is made of polyethylene terephthalate, and the thickness of the flexible substrate 1 is 120 μm; the thickness of the ITO conductive layer 3 is 52 nm, the thickness of the conductive ink column 4 is 50 μm, and the thickness of the silver paste conductive layer 6 is 10 μm; the thickness of the insulating ink layer 7 is 30 μm; the thickness of the color layer 8 is 12 μm; the thickness of the optically transparent adhesive layer 9 is 20 μm; the protective layer 10 is made of polycarbonate, and the thickness of the protective layer 10 is 40 μm.

[0046] The method for preparing the color touch sensor film in this embodiment includes the following steps:

[0047] S1: magnetron sputtering an SO2 layer 1 21, a Si3N4 layer 22, an SO2 layer 23, and an ITO film layer on a flexible substrate 1 in sequence, and then etching the ITO film layer to obtain an ITO conductive layer 3 forming a predetermined conductive pattern;

[0048] A plurality of conductive ink columns 4 are printed and fixed on the ITO conductive layer 3, and then UV curable insulating ink is printed on the ITO conductive layer 3 outside the plurality of conductive ink columns 4, and an insulating ink layer 5 is obtained after UV curing;

[0049] Conductive silver paste is printed on the insulating ink layer 1 5 and cured to obtain a silver paste conductive layer 6; UV curable insulating ink is printed on the silver paste conductive layer 6 and cured by ultraviolet light to obtain an insulating ink layer 2 7, thereby obtaining a touch sensor film body;

[0050] S2: placing the touch sensor film body in a UV color printer, printing color ink on the insulating ink layer 2 7 of the touch sensor film body to form a color layer 8; and bonding the protective layer 10 to the color layer 8 via the optically transparent adhesive layer 9. Example 2:

[0051] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 10% epoxy resin E-51, 6% reactive diluent, 13% filler, 4% photoinitiator, and the balance being acrylic resin.

[0052] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 2:1:2:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 2:3.

[0053] The thickness of the first SO2 layer 21 in the non-conductive inorganic material film layer 2 is 25 nm; the thickness of the Si3N4 layer 22 is 15 nm; and the thickness of the second SO2 layer 23 is 20 nm.

[0054] The thickness of the ITO conductive layer 3 is 55 nm, the thickness of the conductive ink column 4 is 40 μm, the thickness of the silver paste conductive layer 6 is 8 μm; the thickness of the insulating ink layer 7 is 25 μm; and the thickness of the protective layer 10 is 35 μm. Example 3:

[0055] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 11% epoxy resin E-51, 5% reactive diluent, 15% filler, 4% photoinitiator, and the balance being acrylic resin.

[0056] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 4:1:2:2. The filler is composed of talc and fumed silica in a mass ratio of 5:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1:1.

[0057] The thickness of the first SO2 layer 21 in the non-conductive inorganic material film layer 2 is 35 nm; the thickness of the Si3N4 layer 22 is 15 nm; and the thickness of the second SO2 layer 23 is 20 nm.

[0058] The thickness of the flexible substrate 1 is 100 μm; the thickness of the conductive ink column 4 is 65 μm, the thickness of the silver paste conductive layer 6 is 5 μm; the thickness of the color layer 8 is 10 μm; the thickness of the optically transparent adhesive layer 9 is 18 μm; and the thickness of the protective layer 10 is 50 μm. Example 4:

[0059] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 7% epoxy resin E-51, 8% reactive diluent, 10% filler, 3% photoinitiator, and the balance being acrylic resin.

[0060] The active diluent is composed of isobornyl methacrylate, tetrahydrofuran methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 5:1:1:2. The filler is composed of talc and fumed silica in a mass ratio of 2:1.

[0061] The thickness of the first SO2 layer 21 in the non-conductive inorganic material film layer 2 is 30 nm; the thickness of the Si3N4 layer 22 is 25 nm; and the thickness of the second SO2 layer 23 is 25 nm.

[0062] The thickness of the flexible substrate 1 is 100 μm; the thickness of the ITO conductive layer 3 is 45 nm, the thickness of the conductive ink column 4 is 40 μm, the thickness of the insulating ink layer 7 is 25 μm; the thickness of the color layer 8 is 15 μm; and the thickness of the protective layer 10 is 30 μm. Example 5:

[0063] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 9% epoxy resin E-51, 10% reactive diluent, 12% filler, 5% photoinitiator, and the balance being acrylic resin.

[0064] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 2:2:1:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1:3.

[0065] The thickness of the first SO2 layer 21 in the non-conductive inorganic material film layer 2 is 25 nm; the thickness of the Si3N4 layer 22 is 20 nm; and the thickness of the second SO2 layer 23 is 15 nm.

[0066] The thickness of the flexible substrate 1 is 120 μm; the thickness of the ITO conductive layer 3 is 55 nm, the thickness of the silver paste conductive layer 6 is 8 μm; the thickness of the insulating ink layer 7 is 20 μm; the thickness of the color layer 8 is 16 μm; and the thickness of the optically transparent adhesive layer 9 is 15 μm. Example 6:

[0067] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 10% epoxy resin E-51, 7% reactive diluent, 12% filler, 5% photoinitiator, and the balance being acrylic resin.

[0068] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 3:2:2:1. The filler is composed of talc and fumed silica in a mass ratio of 4:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 2:3. Example 7:

[0069] A color touch sensor film on a flexible substrate, different from Example 1, in that the UV curable insulating ink is made of the following raw materials in percentage by weight: 9% epoxy resin E-51, 10% reactive diluent, 12% filler, 3.5% photoinitiator, and the balance being acrylic resin.

[0070] The reactive diluent is composed of isobornyl methacrylate, tetrahydrofuranyl methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 2:1:1:1. The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1:3.

[0071] Comparative Example 1:

[0072] The difference from Example 1 is that the active diluent in the raw materials of the UV curable insulating ink is tetrahydrofuran methacrylate.

[0073] Comparative Example 2:

[0074] Different from Example 1, the raw materials of the UV curable insulating ink are made of the following raw materials in the following weight percentages: 8% active diluent, 12% filler, 5% photoinitiator, and the balance is acrylic resin.

[0075] The active diluent is composed of isobornyl methacrylate and tetrahydrofuran methacrylate in a mass ratio of 1:1.

[0076] Comparative Example 3:

[0077] Different from Example 1, the non-conductive inorganic material film layer 2 includes an SO2 layer 21 fixedly connected to the flexible substrate 1, and does not include the Si3N4 layer 22 and the second SO2 layer 23. The thickness of the first SO2 layer 21 is 50 nm.

[0078] Performance testing:

[0079] 1. The stability of the conductive layer in the color touch sensor film of the embodiment and comparative example was tested by performing a high-temperature and high-humidity test (85°C, 85% RH, 240 hours) and a thermal shock test (-40°C to 80°C, 240 hours, 30 minutes per cycle). The resistance change rate was then tested. The resistance change rate specified in the specification is ≤20%. The specific test results are shown in Table 1.

[0080] Table 1 Stability test results

[0081]

[0082] Table 1 shows that the conductive layer in the color touch sensor film of the present invention has high stability. A comparison of Example 1 with Comparative Examples 1-2 shows that the insulating ink layer prepared using the UV-curable insulating ink raw material formula of the present invention can better prevent changes in the conductive layer's resistance, resulting in a higher stability of the conductive layer. A comparison of Example 1 with Comparative Example 3 shows that the present invention's use of the non-conductive inorganic material film layer 2, consisting of a first SO2 layer, a Si3N4 layer 22, and a second SO2 layer 23, can enhance the stability of the conductive layer.

[0083] 2. UV curing insulation ink performance test

[0084] The UV-curable insulating inks in the examples and comparative examples were printed on a polyethylene terephthalate substrate and cured by UV light to obtain an insulating ink layer. The volume resistivity and adhesion of the insulating ink layer were tested. The adhesion was tested using the 100-grid test method. The specific test results are shown in Table 2.

[0085] Table 2 Volume resistivity and adhesion test results

[0086]

[0087] As shown in Table 2, the UV-curable insulating ink in the embodiment of the present invention has higher adhesion and good insulation. It can be seen that the use of liquid bisphenol A epoxy resin modification and the use of a reactive diluent composed of isobornyl methacrylate, tetrahydrofuran methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in an appropriate mass ratio can obtain an insulating ink layer with higher adhesion, thereby improving the overall performance of the color touch sensor film.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A color touch sensor film on a flexible substrate, comprising a flexible substrate (1), an ITO conductive layer (3) provided on the flexible substrate (1), a plurality of conductive ink columns (4) printed and fixed on the ITO conductive layer (3), an insulating ink layer (5) printed on the ITO conductive layer (3) outside the plurality of conductive ink columns (4), the thickness of the insulating ink layer (5) being adapted to the height of the conductive ink columns (4), and an opening matching the conductive ink columns (4) being provided on the insulating ink layer (5) corresponding to the conductive ink columns (4); A silver paste conductive layer (6) is fixedly printed on the insulating ink layer 1 (5), and an insulating ink layer 2 (7) is fixedly printed on the silver paste conductive layer (6), characterized in that: A non-conductive inorganic material film layer (2) is provided between the flexible substrate (1) and the ITO conductive layer (3); a color layer (8) is fixedly printed on the second insulating ink layer (7); an optically transparent adhesive layer (9) and a protective layer (10) are fixed in sequence outside the color layer (8); The insulating ink layer 1 (5) and the insulating ink layer 2 (7) are both made of UV curable insulating ink; The UV curable insulating ink is made of the following raw materials in percentage by weight: 7-11% liquid bisphenol A epoxy resin, 5-10% reactive diluent, 10-15% filler, 3-5% photoinitiator, and the balance acrylic resin; The active diluent is composed of isobornyl methacrylate, tetrahydrofuran methacrylate, pentaerythritol tetraacrylate, and trimethylolpropane acrylate in a mass ratio of 2-5:1-2:1-2:1-2; The non-conductive inorganic material film layer (2) comprises a first SO2 layer (21) fixedly connected to the flexible substrate (1), and a Si3N4 layer (22) and a second SO2 layer (23) are sequentially fixed outside the first SO2 layer (21).

2. The color touch sensor film on the flexible substrate according to claim 1, characterized in that: The filler is composed of talc powder and fumed silicon dioxide in a mass ratio of 2-5:

1.

3. The color touch sensor film on the flexible substrate according to claim 1, wherein: The liquid bisphenol A epoxy resin is epoxy resin E-51; The photoinitiator is composed of 1,1-dimethyl-1-hydroxyacetophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1-2:2-3.

4. The color touch sensor film on the flexible substrate according to claim 1, wherein: The thickness of the first SO2 layer (21) is 25-35 nm; the thickness of the Si3N4 layer (22) is 15-25 nm; the thickness of the second SO2 layer (23) is 15-25 nm; The SO2 layer 1 (21), the Si3N4 layer (22), and the SO2 layer 2 (23) are all prepared by magnetron sputtering.

5. The color touch sensor film on the flexible substrate according to claim 1, wherein: The flexible substrate (1) is polyethylene terephthalate, and the protective layer (10) is polycarbonate.

6. The color touch sensor film on the flexible substrate according to claim 1, wherein: The thickness of the ITO conductive layer (3) is 45-55 nm, the thickness of the conductive ink column (4) is 40-65 μm, and the thickness of the silver paste conductive layer (6) is 5-10 μm.

7. The color touch sensor film on the flexible substrate according to claim 1, wherein: The thickness of the flexible substrate (1) is 100-120 μm; The thickness of the second insulating ink layer (7) is 20-30 μm; The thickness of the color layer (8) is 10-16 μm; The optically transparent adhesive layer (9) has a thickness of 15-20 μm; The thickness of the protective layer (10) is 30-50 μm.

8. The color touch sensor film on the flexible substrate according to any one of claims 1 to 7, characterized in that: The method for preparing the color touch sensor film comprises the following steps: S1: magnetron sputtering a non-conductive inorganic material film layer (2) and an ITO film layer on a flexible substrate (1) in sequence, and then etching the ITO film layer to obtain an ITO conductive layer (3) forming a predetermined conductive pattern; Printing and fixing a plurality of conductive ink columns (4) on an ITO conductive layer (3), then printing UV-curable insulating ink on the ITO conductive layer (3) outside the plurality of conductive ink columns (4), and obtaining an insulating ink layer (5) after UV curing; Printing conductive silver paste on the insulating ink layer 1 (5), and curing to obtain a silver paste conductive layer (6); printing UV curable insulating ink on the silver paste conductive layer (6), and curing with ultraviolet light to obtain a second insulating ink layer (7), thereby obtaining a touch sensor film body; S2: placing the touch sensor film body in a UV color printer, printing color ink on the second insulating ink layer (7) of the touch sensor film body to form a color layer (8); and bonding the protective layer (10) to the color layer (8) through an optically transparent adhesive layer (9).

Images