CN111863316A

CN111863316A - Transparent conductive film and touch screen

Info

Publication number: CN111863316A
Application number: CN201910365213.7A
Authority: CN
Inventors: 余飞; 候晓伟; 张振双
Original assignee: Nanchang OFilm Display Technology Co Ltd
Current assignee: Nanchang OFilm Display Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30

Abstract

The invention provides a transparent conductive film and a touch screen. The transparent conductive film comprises a substrate, a first electrode and a second electrode, wherein the substrate comprises a first surface and a second surface which are oppositely arranged; the first hard coating, the optical adjusting layer, the transparent conducting layer and the metal layer are sequentially formed on the first surface; a second hard coat layer formed on the second surface; wherein the first hard coating layer and the second hard coating layer have a hardness smaller than that of the optical adjustment layer, and the first hard coating layer and the second hard coating layer have a modulus smaller than that of the optical adjustment layer. The hard coatings on the two sides of the base material have lower hardness and higher flexibility; and the optical adjusting layer with higher hardness and modulus is positioned on the surface of the hard coating, and the optical adjusting layer and the hard coating act together to ensure that the whole laminated structure achieves the balance between flexibility and strength, so that the base material can be prevented from being scratched, and the film can be prevented from being broken in the winding process. In addition, the invention also provides a touch screen.

Description

Transparent conductive film and touch screen

Technical Field

The invention relates to a transparent conductive film and a touch panel.

Background

The transparent conductive film is a core element of a capacitive touch screen, and generally includes a substrate, and a hard coating layer, a conductive layer, and a metal layer stacked in this order. A conventional transparent conductive film uses a substrate formed of a polyethylene terephthalate (PET) film. The PET film is a crystalline polymer film, and has a high birefringence, which varies depending on the location. Therefore, the conventional transparent conductive film has uneven color of rainbow color, i.e., uneven color density. The birefringence of the PET film is usually about 0.01.

Currently, since amorphous polymer films have the advantage of having a smaller birefringence and uniformity than crystalline polymer films, transparent conductive films using amorphous polymer films as a base material are increasing. Amorphous polymer films are more brittle than crystalline polymer films, have surfaces that are more easily scratched, and are easily broken during transportation, such as in a roll-to-roll process.

Disclosure of Invention

The invention provides a transparent conductive film and a touch screen, aiming at solving the problems that the conductive film in the prior art is easy to scratch and break.

The present invention in a first aspect provides a transparent conductive film comprising:

the substrate comprises a first surface and a second surface which are oppositely arranged;

a first hard coat layer formed on the first surface;

a second hard coating layer formed on the second surface;

the optical adjusting layer is formed on the surface of the first hard coating layer far away from the substrate;

the transparent conducting layer is formed on the surface, far away from the first hard coating, of the optical adjusting layer;

the metal layer is formed on the surface, away from the optical adjusting layer, of the transparent conducting layer;

wherein the first hard coating layer and the second hard coating layer have a hardness smaller than that of the optical adjustment layer, and the first hard coating layer and the second hard coating layer have a modulus smaller than that of the optical adjustment layer.

The modulus is the ratio of stress to strain of a material under a stress state, and the larger the modulus is, the smaller the elastic deformation is generated under a certain stress action. In the invention, the hard coatings on the two sides of the base material have lower hardness and good flexibility; the optical adjusting layer with higher hardness is positioned between the hard coating and the transparent conducting layer, so that deformation is not easy to occur, and the optical adjusting layer and the transparent conducting layer act together to ensure that the whole laminated structure achieves the balance between flexibility and strength, not only can prevent the base material from being scratched, but also can inhibit the film from being broken in the winding process. That is, the relatively hard optical adjustment layer is mainly used for preventing the substrate from being scratched in the manufacturing process, and after the conductive layer is formed on the optical adjustment layer, the conductive layer attached to the surface of the optical adjustment layer is not easy to crack due to the fact that the conductive layer is hard to deform when being wound; the relatively soft hard coating is mainly used for improving the flexibility, preventing the substrate from breaking in the subsequent roll-to-roll process and simultaneously playing a scratch-resistant role.

Preferably, the first hard coating layer and the second hard coating layer have a hardness of 0.30 to 0.55Gpa, and the optical adjustment layer has a hardness of 0.55 to 0.70 Gpa.

When the hardness is adjusted within the above range, the conductive film has both excellent scratch resistance and bending resistance, and when the hardness is too large, the film is easily broken, and when the hardness is too small, the scratch resistance is poor.

Preferably, the modulus of the first hard coating layer and the modulus of the second hard coating layer are 5.00-7.00Gpa, and the modulus of the optical adjustment layer is 7.00-9.00 Gpa.

The adjusting modulus is in the range, and the conductive film has relatively balanced strength and flexibility, and can prevent scratching and film breaking. The optical adjustment layer has a large modulus and is less elastically deformed under a certain stress, and thus, the conductive layer is prevented from being broken due to a large dimensional change, and further, the increase in resistance is suppressed, and the durability is excellent.

Preferably, the first hard coating layer and the second hard coating layer have a thickness of 0.5 to 5 μm.

When the thicknesses of the two hard coatings are within the above ranges, scratch resistance and crack resistance of the laminated structure may be appropriately balanced. If the hard coat layer is too thin, the function as a hard coat layer cannot be exhibited, and scratch resistance and crack resistance cannot be obtained. On the other hand, if the hard coat layer is too thick, the flexibility of the hard coat layer decreases, and sufficient crack resistance cannot be obtained.

Preferably, the first hard coating layer and the second hard coating layer have the same thickness.

The thickness of the two is the same, the hardness and the flexibility are equivalent, the deformation is consistent when the film is curled, and the film is prevented from being broken.

Preferably, the thickness of the optical adjustment layer is 50 to 500 nm.

The optical adjusting layer can improve the strength of the laminated structure, prevent the conductive layer from cracking due to the increase of the curl shape and improve the scratch resistance, and adjust the matching refractive index to ensure that the laminated structure achieves high permeability. If the optical adjustment layer is too thin, sufficient hardness cannot be achieved, and the scratch-resistant and anti-cracking effects cannot be achieved; if the optical adjustment layer is too thick, the transmittance is low and the haze is high. When the thickness of the optical adjustment layer is within the above range, the above requirements can be satisfied.

Preferably, the material of the substrate is polycycloolefin or polycarbonate.

The two are novel amorphous polymer materials, and compared with the traditional PET, PE and the like, the birefringence is smaller and uniform, and the color of the formed film is uniform. And has higher hardness, excellent light transmission and lower breaking tensile strength.

Preferably, the first hard coating layer contains a plurality of particles, and the surface of the metal layer forms a plurality of protrusions; alternatively, the second hard coat layer contains a plurality of particles, and a plurality of protrusions are formed on the surface of the second hard coat layer.

When the transparent conductive film is rolled into a cylindrical shape, there is a problem that metal layers of adjacent transparent conductive films are stuck to each other and are pressure-bonded. The particles are added into the hard coating to form bulges on the surface of the metal layer, and the bulges can enable the adjacent metal layers to form point contact, thereby avoiding the occurrence of adhesion and compression joint.

Preferably, the distribution density of the protrusions is 100-²。

When the distribution density of the protrusions is too high, the haze value of the transparent conductive film is too high, the light transmittance is reduced, and the appearance and the optical effect of the transparent conductive film are seriously affected. And if the distribution density of the protrusions is too small, the effect of blocking resistance is limited. Within the density range, the transparent conductive film can better give consideration to both the anti-blocking effect and the optical effect.

A second aspect of the present invention provides a touch panel, including two transparent conductive films according to any one of the first aspects, wherein the two transparent conductive films are bonded to each other, the touch panel is provided with a touch area and a lead area, and the metal layer is located in the lead area; the touch area comprises electrodes formed by etching the transparent conductive layer; the lead area comprises leads formed by etching the metal layer and the transparent conductive layer positioned in the lead area.

In the touch panel, the lead is directly etched from the metal layer and the transparent conductive layer. Therefore, it is not necessary to form a lead wire electrically connected to the electrode by a screen printing method. Compared with the traditional touch screen, the width of the electrode lead wire directly formed by the yellow light process can be further reduced without silk-screen printing, so that the effective touch area is further increased.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.

FIG. 1 is a schematic diagram of a stacked structure of a transparent conductive film according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of another stacked structure of a transparent conductive film according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a stacked structure of another transparent conductive film according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a stacked structure of a touch panel according to a preferred embodiment of the invention;

FIG. 5 is a schematic diagram of a stacked structure of another touch screen in accordance with a preferred embodiment of the present invention;

10, a transparent conductive film; 11. a substrate; 12. a first hard coat layer; 13. an optical adjustment layer; 14. a transparent conductive layer; 15. a metal layer; 16. a second hard coat layer; 17. particles; 18. a protrusion; 19. an optically clear adhesive; 200. a touch screen; 210. a touch area; 220. a lead region; 211. an electrode; 221. and (7) leading wires.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, a transparent conductive film 10 in a preferred embodiment of the invention includes a substrate 11, a first hard coating layer 12, a second hard coating layer 16, an optical adjustment layer 13, a transparent conductive layer 14, and a metal layer 15.

The substrate 11 includes a first surface (an upper surface shown in fig. 1) and a second surface (a lower surface shown in fig. 1) that are oppositely disposed. The first surface and the second surface are only used for distinguishing the two surfaces of the substrate 11, and the positions of the first surface and the second surface can be interchanged. The substrate 11 is formed of an amorphous polymer film. Since the amorphous polymer film has a smaller birefringence and is more uniform than the crystalline polymer film, color unevenness in the transparent conductive film 10 of the present invention can be eliminated. The in-plane birefringence of the amorphous polymer film used in the present invention is preferably 0 to 0.001, and more preferably 0 to 0.0005. The variation in-plane birefringence of the amorphous polymer film used in the present invention is preferably 0.0005 or less, and more preferably 0.0003 or less.

The birefringence and the variation thereof can be achieved by selecting an appropriate type of amorphous polymer film. Specifically, in the present embodiment, the substrate 11 is polycycloolefin or polycarbonate. The thickness of the substrate 11 formed of the amorphous polymer thin film is 20 μm to 200 μm.

The first hard coat layer 12, the optical adjustment layer 13, the transparent conductive layer 14, and the metal layer 15 are sequentially formed on the first surface of the base material 11. The second hard coat layer 16 is formed on the second surface of the substrate 11. Wherein:

the first hard coat layer 12 protects the first surface of the substrate 11. The first hard coat layer 12 contains a binder resin. The binder resin includes, for example, a curable resin composition based on ultraviolet rays or electron beams. The curable resin composition preferably contains a polymer obtained by addition reaction of a glycidyl acrylate polymer and acrylic acid. Alternatively, the curable resin composition preferably contains a multifunctional acrylate polymer (pentaerythritol, dipentaerythritol, etc.). The curable resin composition further contains a polymerization initiator. The second hard coat layer 15 has the same function and material composition as the first hard coat layer 12, and thus, will not be described herein.

The first hard coat layer 12 and the second hard coat layer 16 have a thickness of 0.5 to 5 μm and the same thickness. When the thicknesses of the two hard coatings are within the above ranges, scratch resistance and crack resistance of the laminated structure may be appropriately balanced. If the hard coat layer is too thin, the function as a hard coat layer cannot be exhibited, and scratch resistance and crack resistance cannot be obtained. On the other hand, if the hard coat layer is too thick, the flexibility of the hard coat layer decreases, and sufficient crack resistance cannot be obtained. The thickness of the two is the same, the hardness and the flexibility are equivalent, the deformation is consistent when the film is curled, and the film is prevented from being broken.

The optical adjustment layer 13 is used to improve the optical effect and strength of the transparent conductive film 11. Specifically, after patterning the transparent conductive layer 14 in the subsequent step, the difference in reflectance between the portion having the transparent conductive layer 14 and the portion not having the transparent conductive layer 14 is reduced, and the pattern of the transparent conductive layer 14 is made invisible. The material forming the optical adjustment layer 13 is, for example, a urethane polymer. The thickness of the optical adjustment layer 13 is preferably 50nm to 500 nm. The optical adjustment layer 13 improves the strength of the laminated structure, prevents the conductive layer from being broken due to the increase of curl shape, and improves the scratch resistance, and adjusts the matching refractive index to achieve high transparency of the laminated structure. If the optical adjustment layer 13 is too thin, sufficient hardness cannot be achieved, and scratch resistance and cracking resistance cannot be achieved; if the optical adjustment layer 13 is too thick, the transmittance is low and the haze is high. When the thickness of the optical adjustment layer 13 is within the above range, the above requirements can be satisfied. The refractive index of the optical adjustment layer 13 is preferably set to a value between the refractive index of the first hard coat layer 12 and the refractive index of the transparent conductive layer 14. Therefore, the transition effect can be realized on the propagation path of the light.

The transparent conductive layer 14 is formed on the surface of the optical adjustment layer 13. The transparent conductive layer 14 has a high transmittance (80% or more) in the visible light region (380nm to 780nm) and a surface resistance value per unit area (unit: Ω/m) ²) Is 500 omega/m²The following layers are formed. The thickness of the transparent conductive layer 14 is preferably 15nm to 100nm, more preferably 15nm to 80nm, and still more preferably 20nm to 50 nm. The transparent conductive layer 14 is formed of, for example, any one of Indium Tin Oxide (ITO), indium zinc oxide, or an indium oxide-zinc oxide composite. Or may be formed of any one or two or more of nanomaterials such as metal nanowires, graphene, or carbon nanotubes.

The metal layer 15 is formed on the surface of the transparent conductive layer 14. The metal layer 15 is used to form a wiring outside the touch input region when the transparent conductive film of the present invention is used for a touch panel, for example. The material for forming the metal layer 15 is typically copper, silver, or a copper-nickel alloy, and any metal having excellent conductivity other than copper may be used. The thickness of the metal layer 15 is preferably 20nm to 500nm, more preferably 100nm to 300 nm.

Further, by the nanoindentation test, the hardness of the first hard coating layer 12 and the second hard coating layer 16 is smaller than the hardness of the optical adjustment layer 13, and the modulus of the first hard coating layer 12 and the second hard coating layer 16 is smaller than the modulus of the optical adjustment layer 13.

The nano indentation test is to control the continuous change of the load through a computer and monitor the indentation depth on line. A complete indentation process comprises two steps, the so-called loading and unloading process. During the loading process, an external load is applied to the pressure head to press the pressure head into the surface of the sample, the depth of the pressure head pressed into the sample is increased along with the increase of the load, and when the load reaches the maximum value, the external load is removed, and the surface of the sample has residual indentation marks. Hardness refers to the ability of a material to resist foreign objects being pressed into its surface, and may characterize the degree of hardness of the material, and the ability of the reactive material to resist localized deformation. The calculation formula of the nano hardness is consistent with the traditional hardness formula: h ═ P/a, where H is hardness, P is maximum load, and a is indentation area. The modulus is the ratio of stress to strain of a material under a stress state, and the larger the modulus is, the smaller the elastic deformation is generated under a certain stress action.

In the invention, the hard coating layers (12, 16) on the two sides of the base material have lower hardness and good flexibility; the optical adjusting layer 13 with higher hardness is positioned between the hard coating layers (12 and 16) and the transparent conducting layer 14, so that deformation is not easy to occur, and the two layers act together, so that the whole laminated structure achieves balance between flexibility and strength, and not only can the base material 11 be prevented from being scratched, but also the film can be prevented from being broken in the winding process. That is, the relatively hard optical adjustment layer 13 is mainly used to prevent the substrate 11 from being scratched during the manufacturing process, and after the conductive layer 14 is formed on the optical adjustment layer 13, since the hardness is high, the deformation is small during winding, and the conductive layer attached to the surface is not easy to crack; the relatively soft hard coating (12, 16) is primarily intended to improve flexibility, prevent film breakage of the substrate during subsequent roll-to-roll processing, and also provide scratch resistance.

In the present embodiment, the hardness of the first hard coat layer 12 and the second hard coat layer 16 is 0.30 to 0.55Gpa, preferably 0.35 to 0.40 Gpa. The hardness of the optical adjustment layer 13 is 0.55 to 0.70GPa, preferably 0.6 to 0.65 GPa. When the hardness is adjusted within the above range, the conductive film 10 has excellent scratch resistance and bending resistance, and when the hardness is too large, the film is easily broken, and when the hardness is too small, the scratch resistance is poor. The modulus of first hard coat layer 12 and second hard coat layer 16 is 5.00-7.00Gpa, preferably 5.5-6.5 Gpa. The modulus of the optical adjustment layer 13 is 7.00-9.00GPa, preferably 7.5-8.5 GPa. The adjustment modulus is within the above range, and the conductive film 10 has relatively balanced strength and flexibility, and can prevent scratching and film breakage. The optical adjustment layer 13 has a large modulus and is less elastically deformed by a certain stress, and thus, the conductive layer is prevented from being broken due to a large dimensional change, and further, the increase in resistance is suppressed, and the durability is excellent.

Further, the first hard coat layer 12 and/or the second hard coat layer 16 contain a plurality of particles 17 to form a plurality of protrusions 18 on the surface of the conductive film. Specifically, the particles 17 may be randomly or may be distributed in the first hard coat layer 12 and/or the second hard coat layer 16 in a predetermined regular (e.g., uniform) distribution. The particles 17 may be spherical, ellipsoidal, or other suitable shapes, and may be amorphous particles. In this embodiment, the particles 17 are spherical.

With continued reference to fig. 1 to 3, the particles 17 may be contained in only the first hard coat layer 12 or the second hard coat layer 16, or may be contained in both the first hard coat layer 12 and the second hard coat layer 16, thereby obtaining the transparent conductive film 10 with the protrusions 18 formed on both sides. When the first hard coat layer 12 contains the particles 17, a plurality of protrusions 18 are formed on the surface of the metal layer 15.

The first hard coat layer 12 is taken as an example for explanation:

the particles 17 protrude from the surface of the first hard coat layer 12, so that the surface of the first hard coat layer 12 forms a convex region, and the region of the first hard coat layer 12 not provided with the particles 17 forms a flat region. Since the optical adjustment layer 13, the transparent conductive layer 14, and the metal layer 15 are sequentially stacked on the surface of the first hard coat layer 12, the surface shapes of the three layers are the same as the surface shape of the first hard coat layer 12. Therefore, a plurality of projections 18 are formed in the region of the metal layer 13 corresponding to the particles 17.

Similarly, when the particles 17 are contained in the second hard coat layer 16, the surface thereof also forms convex regions.

When the transparent conductive film 10 is manufactured in a roll-to-roll process, the particles 17 form a plurality of protrusions 18 on the surface of the metal layer 15. Therefore, when the transparent conductive film 10 is curled, the plurality of protrusions 16 can make point contact between two adjacent metal layers, thereby preventing adhesion and pressure contact between the metal layers.

The size of the particles 17 in the direction perpendicular to the surface of the substrate 11 may be larger than the thickness of the flat region; or less than or equal to the thickness of the flat region, in which case there is a gap between the particles 17 and the surface of the substrate 11 to form a convex region (not shown) on the surface. That is, it is equivalent to suspending the particles 17 in the first hard coat layer 12 and/or the second hard coat layer 16, and thus, the particles 17 do not come into direct contact with the surface of the substrate 11. Therefore, even if the surface of the particle 17 has an irregular protruding structure, the base material 11 is not damaged.

In the present embodiment, the first hard coat layer 12 and the second hard coat layer 16 each contain particles 17, so that a plurality of convex regions are formed on both sides of the transparent conductive film 10. Therefore, when the transparent conductive film 10 is rolled, the number of points of point contact between two adjacent metal layers increases, and therefore the anti-blocking and anti-pressure contact effects are more excellent.

The material of the particles 17 is silica, zirconia, a silicone polymer, an acrylic polymer, or a styrene polymer, or a composite of the above materials, and may be other suitable materials. In the present embodiment, the particles 17 are made of the same material as the first hard coat layer 12 and the second hard coat layer 16.

Since the material of the particles 17 is the same as that of the first hard coat layer 12 and the second hard coat layer 16, the optical parameters are also the same. Therefore, at the interface of the particle 17 and the hard coat layer, light transmission is less affected, and the particle 17 and the hard coat layer are more closely integrated. When light passes through the first hard coat layer 12 and the second hard coat layer 16 containing the particles 17, the distortion of the propagation path thereof is small. Therefore, the transparent conductive film 10 can prevent the optical properties from being adversely affected while achieving the purpose of blocking resistance and bonding resistance.

In order to achieve better anti-blocking and anti-bonding effects, there are corresponding requirements for the surface roughness of the transparent conductive film 10 and the density of the protrusions 18.

In this implementationIn the example, the distribution density of the projections 18 is 100-3000/mm²。

When the distribution density of the protrusions 18 is too high, the haze value of the transparent conductive film 10 is too high, and the light transmittance is lowered, thereby seriously affecting the appearance and the optical effect of the transparent conductive film 10. Whereas if the distribution density of the protrusions 18 is too small, the effect of blocking resistance is limited. Within the above density range, the transparent conductive film 10 can preferably achieve both the anti-blocking and optical effects.

Wherein the distribution density of the protrusions 18 can be changed by adjusting the shape, size and content of the particles 17.

Further, in the present embodiment, the height of the plurality of projections 18 in the direction perpendicular to the surface of the metal layer 15 is 0.1 to 0.5 μm.

The height of the bump 18 refers to the height of the bump 18 protruding from the surface of the metal layer 15. Because of the small size of the particles 17, it is difficult to precisely control the height of each protrusion 18. Therefore, the height of the projection 18 may be controlled within the above height range. It should be noted that, in actual production, since it is difficult to accurately control each particle 17, it is difficult to avoid that the height of the projection 18 formed by a very small portion of the particle 17 is outside the above range. However, the effect of the portion of the projection 18 is negligible. And the height of the projections 18 may also refer to an arithmetic average of the heights of a number of projections 18 within a predetermined range.

In general, the higher the height of the projections 18, the better the anti-blocking effect. However, as the height increases, the size of the particles 17 needs to be increased, so that the haze value of the transparent conductive film 10 is increased, and the optical effect of the transparent conductive film 10 is seriously affected to a certain extent. Within the above height range, the transparent conductive film 10 can achieve both the anti-blocking effect and the optical effect.

In addition, the invention also provides a touch screen. Referring to fig. 4 and 5, a touch panel 200 according to a preferred embodiment of the present invention is made of the transparent conductive film 10 of the above-mentioned embodiment. Wherein:

touch screen 200 includes a touch region 210 and a lead region 220. Specifically, the touch region 210 is located in the middle of the touch screen 200, and the lead line regions 220 are disposed around the circumference of the touch region 210. Metal layer 15 is located at lead pad 220. The transparent conductive layer 14 in the touch area 210 is etched to form an electrode 211. The plurality of electrodes 211 form an electrode pattern. The metal layer 15 in the lead region 220 and the transparent conductive layer 14 in the lead region 220 are etched to form the lead 221, i.e. the lead 221 has a double-layer structure. Then, the two etched transparent conductive films 10 are bonded to each other with an optically transparent adhesive 19 to form the touch panel 200. The electrodes of the two transparent conductive films 10 are spatially crossed with each other to form a driving electrode and a sensing electrode of a capacitive structure.

In this embodiment, the second hard coat layers 16 of the two etched transparent conductive films 10 are bonded to each other to form the touch panel 200. In other embodiments, touch screen 200 may also be formed by second hard coat layer 16 attached to touch pad 210 and lead pad 220.

In the touch screen, the metal layer 15 and the transparent conductive layer 14 are directly etched to obtain the lead 221, and the width of the electrode lead directly formed by the yellow light process can be further reduced without silk printing, so that the effective touch space of the touch screen is further increased.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A transparent conductive film comprising:

a first hard coat layer formed on the first surface;

a second hard coating layer formed on the second surface;

characterized in that the hardness of the first hard coating layer and the second hard coating layer is smaller than the hardness of the optical adjustment layer, and the modulus of the first hard coating layer and the second hard coating layer is smaller than the modulus of the optical adjustment layer.

2. The transparent conductive film according to claim 1, wherein the first hard coat layer and the second hard coat layer have a hardness of 0.30 to 0.55Gpa, and the optical adjustment layer has a hardness of 0.55 to 0.70 Gpa.

3. The transparent conductive film according to claim 1, wherein the modulus of the first hard coat layer and the second hard coat layer is 5.00-7.00Gpa, and the modulus of the optical adjustment layer is 7.00-9.00 Gpa.

4. The transparent conductive film according to claim 1, wherein the thickness of the first hard coat layer and the second hard coat layer is 0.5 to 5 μm.

5. The transparent conductive film according to claim 4, wherein the first hard coat layer and the second hard coat layer have the same thickness.

6. The transparent conductive film according to claim 1, wherein the thickness of the optical adjustment layer is 50 to 500 nm.

7. The transparent conductive film according to claim 1, wherein the substrate is polycycloolefin or polycarbonate.

8. The transparent conductive film according to claim 1, wherein the first hard coat layer contains a plurality of particles, and a plurality of protrusions are formed on the surface of the metal layer; alternatively, the second hard coat layer contains a plurality of particles, and a plurality of protrusions are formed on the surface of the second hard coat layer.

9. The transparent conductive film as claimed in claim 8, wherein the distribution density of the protrusions is 100-3000 protrusions/mm²。

10. A touch panel comprising two transparent conductive films according to any one of claims 1 to 9, wherein the two transparent conductive films are bonded to each other, the touch panel is provided with a touch area and a lead area, and the metal layer is located on the lead area; the touch area comprises electrodes formed by etching the transparent conductive layer; the lead area comprises leads formed by etching the metal layer and the transparent conductive layer positioned in the lead area.