Ultra-thin flexible touch screen and preparation method thereof

Abstract

The present invention provides an ultra-thin flexible touch screen and a preparation method thereof, comprising: a coating, an ultra-thin flexible glass, a capacitive sensing layer, a first OC protective layer, a capacitive driving layer, and a second OC protective layer, wherein the coating is arranged on the front of the ultra-thin flexible glass, the capacitive sensing layer is directly arranged on the back of the ultra-thin flexible glass, the first OC protective layer is directly arranged on the surface of the capacitive sensing layer, the capacitive driving layer is directly arranged on the surface of the first OC protective layer, and the second OC protective layer is directly arranged on the surface of the capacitive driving layer. The key technology is to integrate all the metal grid ultra-thin flexible conductive materials on the ultra-thin flexible glass, without the need for OCA, with a reduced thickness, a thinner structure, excellent bending resistance, and higher transmittance.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screens, and in particular to an ultra-thin flexible touch screen and a preparation method thereof. Background Art

[0002] With the development of computer technology, the input method of computers has gone through four stages from the original paper tape input to keyboard input, mouse input, and touch input. This process is a process from professional to popular. Touch screen technology allows more people to use computers. A touch screen is an interactive input device. Users can control the operation of the computer by simply touching a certain position of the touch screen with their fingers or a light pen. Therefore, touch screen technology has the characteristics of simple operation and flexible use. There are two types of capacitive touch screens. One is a glass capacitive touch screen, which uses a glass process to produce a glass capacitor layer. The capacitor layer is a glass with a specific capacitor sensing pattern and a driving pattern; the other is a thin film capacitive touch screen, which uses a thin film process to produce a thin film capacitor layer. The capacitor layer is a transparent conductive film with a specific capacitor sensing pattern and a driving pattern. Due to the light weight, thin thickness, strong flexibility, low price and other factors of the thin film capacitive touch screen, the market of thin film capacitive touch screens far exceeds that of glass capacitive touch screens.

[0003] Conventional thin-film capacitive touch screens are generally composed of CG (cover glass), upper OCA (solid optical adhesive), upper ITO film, lower OCA, and lower ITO film. The structural diagram is as follows: Figure 1 As shown. The commonly used thickness of the CG (cover glass) used is generally 0.55mm, 0.7mm, 1.1mm, and the thinnest can be 0.4mm, but the market is small; the commonly used thickness of the upper OCA is generally 0.1mm and 0.125mm; the conventional thickness of the upper ITO film is 0.05mm, 0.1mm, and 0.125mm; the thickness of the lower OCA is between the upper ITO film and the lower ITO film, and only the silver paste and insulation thickness of the lower ITO film edge are used, so the thickness of 0.05mm and 0.1mm is generally used; the thickness of the lower ITO film is generally 0.05mm, 0.1mm, and 0.125mm. Therefore, the thickness of the touch screen of this structure is generally thicker, about 0.65mm; the stacking structure has 5 layers, and the CG, the upper ITO film, and the lower ITO film need to be bonded together by the upper OCA and the lower OCA to form a touch screen. It is impossible to integrate the CG, the upper ITO film, and the lower ITO film together to form a touch screen.

[0004] In addition, the upper and lower line ITO films are made by magnetron sputtering indium tin oxide to form a conductive film on the surface of the PET substrate. The bending resistance of indium tin oxide can generally only meet 300 to 2400 times. After more than 2400 times, indium tin oxide will crack and cause short circuit, affecting the electrical function, and is not suitable as a conductive material for flexible touch screens.

[0005] In summary, conventional touch screens are relatively thick, have more stacked structures, and have complex manufacturing processes. They require four laminations to produce a touch screen display, have a long production cycle, and have average bending resistance, making them unsuitable for flexible touch screens. Therefore, it is necessary to provide an ultra-thin flexible touch screen and a preparation method thereof to simplify the manufacturing process, reduce the production cycle, improve the bending resistance, and make them more suitable for flexible touch screens. Summary of the invention

[0006] The problem solved by the present invention is to provide an ultra-thin flexible touch screen and a preparation method thereof. The key technology is to integrate all metal grid ultra-thin flexible conductive materials on ultra-thin flexible glass, i.e. Touch on Cover lens, and there is no need to use OCA to laminate the sensing capacitor layer, the driving capacitor layer and the cover plate together for many times; at the same time, the cover plate is not made of rigid glass but ultra-thin flexible glass, and the conductive material is not an ITO film but a metal grid ultra-thin flexible conductive material, so that a truly ultra-thin flexible touch screen can be realized.

[0007] In order to solve the above problems, the present invention provides an ultra-thin flexible touch screen structure, which includes: a coating 1, an ultra-thin flexible glass 2, a capacitive sensing layer 3, a first OC protective layer 4, a capacitive driving layer 5, and a second OC protective layer 6; the coating 1 is arranged on the front side of the ultra-thin flexible glass, the capacitive sensing layer 3 is directly arranged on the back side of the ultra-thin flexible glass 2, the first OC protective layer 4 is directly arranged on the surface of the capacitive sensing layer 3, the capacitive driving layer 5 is directly arranged on the surface of the first OC protective layer 4, and the second OC protective layer 6 is directly arranged on the surface of the capacitive driving layer 5.

[0008] Optionally, the coating 1 has a thickness of 5 um and includes a simple HC coating, or includes the HC coating and the AF coating arranged in sequence from the inside to the outside, or includes the HC coating, the AG coating and the AF coating arranged in sequence from the inside to the outside, or includes the HC coating, the AR coating and the AF coating arranged in sequence from the inside to the outside, or includes the HC coating, the AG coating, the AR coating and the AF coating arranged in sequence from the inside to the outside.

[0009] Optionally, the thickness of the ultra-thin flexible glass 2 is 30 um.

[0010] Optionally, the thickness of the capacitive sensing layer 3 and the capacitive driving layer 5 are both 2 um.

[0011] Optionally, the capacitive sensing layer 3 and the capacitive driving layer 5 are both made of metal conductive materials, and are composed of an in-plane metal grid and metal edge wiring.

[0012] Optionally, the metal conductive material is copper.

[0013] Optionally, the thickness of the first OC protection layer 4 and the second OC protection layer 6 are both 1 um.

[0014] Optionally, the first OC protection layer 4 and the second OC protection layer 6 are both transparent insulating inks with a transmittance higher than 99%.

[0015] Optionally, the total thickness of the ultra-thin flexible touch screen structure is 41 um.

[0016] Optionally, the present invention further provides a method for preparing the above-mentioned ultra-thin flexible touch screen structure, comprising the following steps: performing a coating process on the front surface of an ultra-thin flexible glass having a thickness of 30 mm to form a coating layer 1, wherein the coating layer 1 has a thickness of 5 um, and comprises a simple HC coating layer, or comprises the HC coating layer and the AF coating layer arranged in sequence from the inside to the outside, or comprises the HC coating layer, the AG coating layer and the AF coating layer arranged in sequence from the inside to the outside, or comprises the HC coating layer, the AR coating layer and the AF coating layer arranged in sequence from the inside to the outside, or comprises the HC coating layer, the AG coating layer, the AR coating and the AF coating layer arranged in sequence from the inside to the outside;

[0017] A 2um metal conductive material layer is evaporated on the back of the 30mm thick ultra-thin flexible glass 2, and an in-plane metal grid and metal edge wiring are obtained by exposure, development, and etching to form a capacitive sensing layer 3;

[0018] Then, a first OC protective layer 4 with a thickness of 1 μm is printed on the surface of the capacitive sensing layer 3 by a screen printer to protect the capacitive sensing layer 3 and increase the transmittance;

[0019] Then, a 2 μm metal conductive material layer is evaporated on the surface of the first OC protection layer 4, and an in-plane metal grid and metal edge wiring are obtained by exposure, development and etching to form a capacitive driving layer 5;

[0020] A second OC protection layer 6 with a thickness of 1 um is then printed on the surface of the capacitor driving layer 5 by a screen printer to protect the capacitor driving layer 5 and increase transmittance.

[0021] The ultra-thin flexible touch screen provided by the present invention is thinner than the conventional touch screen. The coating thickness is 5um, the ultra-thin flexible glass thickness is 30um, the capacitive sensing layer thickness is 2um, the first OC protection layer thickness is 1um, the capacitive driving layer thickness is 2um, and the second OC protection layer thickness is 1um. The total thickness is 41um, i.e. 0.041mm, which is 15.85 times thinner than the conventional touch screen thickness of 0.65mm, and can achieve the ultra-thin characteristic requirements.

[0022] Compared with conventional touch screens, the ultra-thin flexible touch screen provided by the present invention is suitable for flexible, curved, and folding screens. The ultra-thin flexible glass can be bent 400,000 times under the condition of a bending diameter of 3mm; the capacitive sensing layer and the capacitive driving layer made of copper can be bent 200,000 times under the condition of a bending diameter of 3mm. Compared with the conventional touch screen that can meet the maximum bending resistance test of 2,400 times, the bending resistance has increased by at least 83.3 times, which can meet the requirements of flexibility, curved surface, and folding characteristics.

[0023] An ultra-thin flexible touch screen provided by the present invention has higher transmittance and lower square resistance than conventional touch screens. An ultra-thin flexible touch screen can increase the transmittance of a conventional touch screen by 1% to 2% due to the use of a first OC protective layer and a second OC protective layer with high transmittance. Simultaneously, since the structure has only one layer and is relatively thin, very little luminous flux is lost when light passes through the touch screen, and the transmittance is higher than that of a conventional touch screen. An ultra-thin flexible touch screen uses copper as the conductive material, and its square resistance can reach 1Ω / □, while conventional touch screens use ITO as the conductive material, and its square resistance is generally 150Ω / □, which is 150 times lower. The lower the square resistance, the less time it takes for the capacitor to be fully charged, the smaller the signal loss, and the faster the touch response speed and smoother the touch when the user uses it.

[0024] Compared with conventional touch screens, it has the following advantages:

[0025] 1. The structure is simple to stack and consists of only one layer.

[0026] 2. No need to use adhesives such as OCA, no lamination process is required, and the process is simple.

[0027] 3. The structure is thinner, and the thickness is reduced by 15.85 times compared with conventional touch screens.

[0028] 4. Excellent bending resistance, which is at least 83.3 times stronger than conventional touch screens.

[0029] 5. The transmittance is higher. Compared with conventional touch screens, the transmittance increases by 2%.

[0030] 6. The square resistance is lower. Compared with conventional touch screens, the square resistance is reduced by 150 times, the touch response speed is faster and the touch is smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of a conventional touch screen.

[0032] Figure 2 It is a structural schematic diagram of an ultra-thin flexible touch screen in the present invention.

[0033] Figure 3 It is a partial cross-sectional view of the metal copper layer of the capacitive sensing layer and / or the capacitive driving layer in the present invention. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0035] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0036] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0037] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0038] Embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following, parts corresponding to each other in the drawings will be denoted by the same reference numerals.

[0039] A structural schematic diagram of an ultra-thin flexible touch screen and a method for preparing the same is shown in FIG. Figure 2It is mainly composed of a coating layer 1, an ultra-thin flexible glass 2, a capacitive sensing layer 3, a first OC protective layer 4, a capacitive driving layer 5, and a first OC protective layer 6.

[0040] The coating 1 is generally composed of four coatings, HC, AG, AR, and AF, from the inside to the outside. It can be a simple HC coating, a HC / AF coating, a HC / AG / AF or HC / AR / AF coating, or a HC / AG / AR / AF coating. AG, AR, AF, and HC are coated on the front of the ultra-thin flexible glass with different liquids by magnetron sputtering or spraying, and the thickness is generally about 5um. The main purpose is to increase the surface hardness of the front of the ultra-thin glass 2 to 750g 3H~9H, while increasing the transmittance of the ultra-thin flexible glass, reducing the reflectivity of the ultra-thin flexible glass, and enhancing the anti-dizziness function of the ultra-thin flexible glass 2 to achieve excellent optical effects.

[0041] HC coating is a hardening layer containing nano-level silicon dioxide and organic substances. It is mainly used to improve the surface hardness of ultra-thin flexible glass 2 to prevent surface scratches. Generally, the surface hardness can be as low as 750g 3H and as high as 750g 9H, which can meet the surface hardness requirements of touch screen cover.

[0042] AG coating is mainly a kind of nano-silicon dioxide particles that form an uneven film on the surface of HC coating to achieve diffuse reflection. Generally, the visual effect is best when the haze is below 20%. When there is a difference between the brightness of the external light source and the brightness of the display, due to the existence of diffuse reflection, no glare will be generated, achieving the effect of anti-glare and enhancing the visual experience. At the same time, controlling the diameter of silicon dioxide particles can effectively improve the bright spot problem and prevent the sparkle phenomenon.

[0043] The AR coating forms a multi-layer anti-reflection layer on the surface of the AG coating, which is generally a variety of low-refractive-index silicon dioxide and high-refractive-index niobium pentoxide. When light is incident on the ultra-thin flexible glass 2, due to the different refractive indices of the surface of the ultra-thin flexible glass 2, the anti-reflection layer, and the air layer, there is a certain phase difference between the reflected light passing through the ultra-thin flexible glass 2 and the reflected light passing through the anti-reflection layer. This phase difference will produce light interference, causing the two reflected lights to cancel each other out, thereby achieving the optical requirements of low reflection and high transmittance. The surface reflectivity can be below 0.5%, and the lowest can reach 0.1%, so that the overall reflectivity of the touch screen can be reduced from 10% to 5%.

[0044] AF coating is a Si-F compound that forms a hydrophobic and oleophobic layer on the surface of AR coating to improve smoothness and anti-fouling performance when touched. Generally, the surface water drop angle of AF coating with anti-fingerprint function is 110°±10°.

[0045] The thickness of ultra-thin flexible glass 2 is generally between 30um and 200um. The thickness of ultra-thin glass conventionally used for folding and flexible touch screens is 30, 40, or 50um. Under the condition of a bending diameter of 3mm, it can be bent 400,000 times, which can fully meet the requirements of ultra-thin and flexible properties.

[0046] The capacitive sensing layer 3 is made by evaporating metal copper on the back of the ultra-thin flexible glass, and obtaining an in-plane metal grid and copper edge routing through exposure, development, and etching. The in-plane metal grid line width can be 2um to 3um, and the line width and line spacing of the copper edge routing can be 10um / 10um to 20um / 20um. The line width and line spacing of the in-plane metal grid and the copper edge routing are adjusted according to product size and performance requirements.

[0047] The first OC protective layer 4 is a transparent insulating ink with high transmittance, which is located on the surface of the capacitive sensing layer 3. Its transmittance is as high as 99%, which has no effect on the appearance of the entire touch screen. Its curing method can be UV curing, baking or IR type thermal curing. The thickness is about 1um, which can well protect the capacitive sensing layer from corrosion and improve the overall transmittance. Generally speaking, the transmittance can be increased by about 2% after printing the first OC protective layer.

[0048] The capacitor driving layer 5 is made by evaporating metal copper on the surface of the first OC protective layer 4, and obtaining an in-plane metal grid and copper edge routing through exposure, development, and etching. The line width of the in-plane metal grid can be 2um to 3um, and the line width and line spacing of the copper edge routing can be 10um / 10um to 20um / 20um. The line width of the in-plane metal grid and the line width and line spacing of the copper edge routing are adjusted according to product size and performance requirements.

[0049] The second OC protective layer 6 is a transparent insulating ink with high transmittance, which is located on the surface of the capacitor driving layer 5. Its transmittance is as high as 99%, which has no effect on the appearance of the entire touch screen. Its curing method can be UV curing, baking or IR type thermal curing. The thickness is about 1um, which can well protect the capacitor driving layer from corrosion and improve the overall transmittance. Generally speaking, printing the second OC protective layer can increase the transmittance by about 2%.

[0050] In another embodiment, in order to further increase the bending resistance, in the metal mesh in the plane of the capacitor sensing layer 3 and / or the capacitor driving layer 5 and the metal copper layer of the copper edge wiring, a plurality of hollow structures are obtained by exposure, development, and etching. The hollow structures may be rectangular, circular, diamond-shaped, etc. The size of the hollow structure in the in-plane metal mesh is smaller than the line width of the in-plane metal mesh, and the size of the hollow structure in the copper edge wiring is smaller than the line width of the copper edge wiring. For example, see the attached Figure 3The part cross-sectional view of the metal copper layer of the capacitance sensing layer and / or capacitance driving layer. Further, in the hollow structure, an organic conductive film 7 is filled, the conductive filler doped with carbon nanotubes / graphite is in the organic conductive film, wherein the ratio of carbon nanotubes to graphite is 1:4 ~ 1:7, the ratio of organic polymer to conductive filler (carbon nanotubes / graphite) is 27.6:72.4 ~ 32.4:67.6, at this moment, the organic conductive film 7 has the best electrical property and mechanical property, becomes a kind of quasi-one-dimensional conductor, the mobility along the tube axis direction can be comparable with good conductor, and the carbon nanotube has super mechanical property, shows as Young's modulus and bending strength are high, toughness is excellent. Further increase the bending resistance of the capacitance sensing layer and / or capacitance driving layer, can meet the requirements of flexibility, curved surface, folding characteristics.

[0051] The ultra-thin flexible touch screen provided by the present invention is thinner than the conventional touch screen. The coating thickness is 5um, the ultra-thin flexible glass thickness is 30um, the capacitive sensing layer thickness is 2um, the first OC protection layer thickness is 1um, the capacitive driving layer thickness is 2um, and the second OC protection layer thickness is 1um. The total thickness is 41um, i.e. 0.041mm, which is 15.85 times thinner than the conventional touch screen thickness of 0.65mm, and can achieve the ultra-thin characteristic requirements.

[0052] Compared with conventional touch screens, the ultra-thin flexible touch screen provided by the present invention is suitable for flexible, curved, and folding screens. The ultra-thin flexible glass can be bent 400,000 times under the condition of a bending diameter of 3mm; the capacitive sensing layer and the capacitive driving layer made of copper can be bent 200,000 times under the condition of a bending diameter of 3mm. Compared with the conventional touch screen that can meet the maximum bending resistance test of 2,400 times, the bending resistance has increased by at least 83.3 times, which can meet the requirements of flexibility, curved surface, and folding characteristics.

[0053] An ultra-thin flexible touch screen provided by the present invention has higher transmittance and lower square resistance than conventional touch screens. An ultra-thin flexible touch screen can increase the transmittance of a conventional touch screen by 1% to 2% due to the use of a first OC protective layer and a second OC protective layer with high transmittance. Simultaneously, since the structure has only one layer and is relatively thin, very little luminous flux is lost when light passes through the touch screen, and the transmittance is higher than that of a conventional touch screen. An ultra-thin flexible touch screen uses copper as the conductive material, and its square resistance can reach 1Ω / □, while conventional touch screens use ITO as the conductive material, and its square resistance is generally 150Ω / □, which is 150 times lower. The lower the square resistance, the less time it takes for the capacitor to be fully charged, the smaller the signal loss, and the faster the touch response speed and smoother the touch when the user uses it.

[0054] like Figure 2 The process flow of the method for preparing an ultra-thin flexible touch screen is as follows:

[0055] 1. A coating process is performed on the front side of an ultra-thin flexible glass 2 with a thickness of 30 mm to form a coating layer 1 with a thickness of about 5 μm, so that the cover plate has functions such as HC, AG, AR, and AF, and meets the requirements of mechanical properties such as surface hardness and optical properties.

[0056] 2. A 2um copper metal layer is evaporated on the back of the 30mm thick ultra-thin flexible glass 2, and an in-plane metal grid and copper edge wiring are obtained through exposure, development, and etching to form a capacitive sensing layer 3. The in-plane metal grid line width can be 2um to 3um, and the line width and line spacing of the copper edge wiring can be 10um / 10um to 20um / 20um.

[0057] 3. A first OC protection layer 4 with a thickness of 1 um is printed on the surface of the capacitive sensing layer 3 by a screen printer to protect the capacitive sensing layer and increase the transmittance.

[0058] 4. Then, a 2um copper metal layer is evaporated on the surface of the first OC protective layer 4, and an in-plane metal grid and copper edge wiring are obtained through exposure, development, and etching to form a capacitor driving layer 5. The in-plane metal grid line width can be 2um to 3um, and the line width and line spacing of the copper edge wiring can be 10um / 10um to 20um / 20um.

[0059] 5. A second OC protection layer 6 with a thickness of 1 um is printed on the surface of the capacitor driving layer 5 by a screen printer to protect the capacitor driving layer and increase the transmittance.

[0060] 6. Attach ACF (anisotropic conductive adhesive) to FPC (flexible printed circuit), press the FPC with ACF and the bonding area of ​​the ultra-thin flexible glass to connect the ultra-thin flexible glass and FPC to form a touch screen that can receive and transmit signals.

[0061] 7. Then apply glue to the bonding area to seal it and prevent external moisture from entering.

[0062] Through the above process, the metal grid ultra-thin flexible conductive material can be integrated on the ultra-thin flexible glass, namely Touch on Cover lens, to realize the preparation of ultra-thin flexible touch screen.

[0063] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0064] Although the present disclosure has been described with reference to the embodiments of the present disclosure, it is to be understood that the present disclosure is not limited to the embodiments and configurations. The present disclosure is intended to cover various modifications and equivalent arrangements. In addition, in addition to the various combinations and configurations described, other combinations and configurations including more, fewer elements or only including a single element also fall within the spirit and scope of the present disclosure.

Claims

1. An ultra-thin flexible touch screen structure, characterized in that: include: Coating, ultra-thin flexible glass, capacitive sensing layer, first OC protection layer, capacitive driving layer, second OC protection layer; The coating layer is arranged on the front side of the ultra-thin flexible glass, the capacitive sensing layer is directly arranged on the back side of the ultra-thin flexible glass, the first OC protective layer is directly arranged on the surface of the capacitive sensing layer, the capacitive driving layer is directly arranged on the surface of the first OC protective layer, and the second OC protective layer is directly arranged on the surface of the capacitive driving layer; The capacitive sensing layer and the capacitive driving layer are both made of metal conductive materials, and are composed of an in-plane metal grid and metal edge wiring; The metal conductive material is copper; In the in-plane metal grid of the capacitive sensing layer and / or the capacitive driving layer and the metal copper layer of the copper edge wiring, a plurality of hollow structures are obtained by exposure, development, and etching, wherein the size of the hollow structure in the in-plane metal grid is smaller than the line width of the in-plane metal grid, and the size of the hollow structure in the copper edge wiring is smaller than the line width of the copper edge wiring; An organic conductive film is filled in the hollow structure, wherein the organic conductive film is doped with a conductive filler of carbon nanotubes / graphite, wherein the ratio of carbon nanotubes to graphite is 1:4 to 1:7, and the ratio of organic polymer to carbon nanotubes / graphite is 27.6:72.4 to 32.4:67.

6.

2. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The coating has a thickness of 5 um, including a simple HC coating, or including the HC coating and the AF coating arranged in sequence from the inside to the outside, or including the HC coating, the AG coating and the AF coating arranged in sequence from the inside to the outside, or including the HC coating, the AR coating and the AF coating arranged in sequence from the inside to the outside, or including the HC coating, the AG coating, the AR coating and the AF coating arranged in sequence from the inside to the outside.

3. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The thickness of the ultra-thin flexible glass is 30 um.

4. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The thickness of the capacitive sensing layer and the capacitive driving layer are both 2 um.

5. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The thickness of the first OC protection layer and the second OC protection layer are both 1 um.

6. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The first OC protection layer and the second OC protection layer are both transparent insulating inks with a transmittance higher than 99%.

7. The ultra-thin flexible touch screen structure according to claim 1, characterized in that: The total thickness of the ultra-thin flexible touch screen structure is 41 um.

8. A method for preparing an ultra-thin flexible touch screen structure as claimed in claim 1, characterized in that: The following steps are involved: 1) A coating is performed on the front surface of an ultra-thin flexible glass with a thickness of 30 mm to form a coating layer, wherein the coating layer has a thickness of 5 um and includes a simple HC coating layer, or includes the HC coating layer and the AF coating layer arranged in sequence from the inside to the outside, or includes the HC coating layer, the AG coating layer and the AF coating layer arranged in sequence from the inside to the outside, or includes the HC coating layer, the AR coating layer and the AF coating layer arranged in sequence from the inside to the outside, or includes the HC coating layer, the AG coating layer, the AR coating and the AF coating layer arranged in sequence from the inside to the outside; 2) A 2um metal conductive material layer is evaporated on the back of the 30mm thick ultra-thin flexible glass, and the in-plane metal grid and metal edge routing are obtained through exposure, development, and etching to form a capacitive sensing layer; 3) Printing a first OC protective layer with a thickness of 1 um on the surface of the capacitive sensing layer by a screen printer to protect the capacitive sensing layer and increase transmittance; 4) A 2 μm metal conductive material layer is evaporated on the surface of the first OC protective layer, and an in-plane metal grid and metal edge wiring are obtained by exposure, development, and etching to form a capacitive driving layer; 5) Printing a second OC protective layer with a thickness of 1 um on the surface of the capacitor driving layer by a screen printer to protect the capacitor driving layer and increase transmittance; Wherein, the capacitive sensing layer and the capacitive driving layer are both made of metal conductive materials, and are composed of in-plane metal grids and metal edge wiring; The metal conductive material is copper; In the in-plane metal grid of the capacitive sensing layer and / or the capacitive driving layer and the metal copper layer of the copper edge wiring, a plurality of hollow structures are obtained by exposure, development, and etching, wherein the size of the hollow structure in the in-plane metal grid is smaller than the line width of the in-plane metal grid, and the size of the hollow structure in the copper edge wiring is smaller than the line width of the copper edge wiring; An organic conductive film is filled in the hollow structure, wherein the organic conductive film is doped with a conductive filler of carbon nanotubes / graphite, wherein the ratio of carbon nanotubes to graphite is 1:4 to 1:7, and the ratio of organic polymer to carbon nanotubes / graphite is 27.6:72.4 to 32.4:67.6.

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