WO2020206735A1 - 柔性导电薄膜及其制备方法、显示面板 - Google Patents

柔性导电薄膜及其制备方法、显示面板 Download PDF

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Publication number
WO2020206735A1
WO2020206735A1 PCT/CN2019/083978 CN2019083978W WO2020206735A1 WO 2020206735 A1 WO2020206735 A1 WO 2020206735A1 CN 2019083978 W CN2019083978 W CN 2019083978W WO 2020206735 A1 WO2020206735 A1 WO 2020206735A1
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Prior art keywords
conductive layer
film
base film
conductive
flexible
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Application number
PCT/CN2019/083978
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English (en)
French (fr)
Inventor
李颖
刘卫平
Original Assignee
深圳市华星光电技术有限公司
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Priority to US16/496,442 priority Critical patent/US20220016874A1/en
Publication of WO2020206735A1 publication Critical patent/WO2020206735A1/zh

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    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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Definitions

  • the invention relates to the field of optics, in particular to a flexible conductive film, a preparation method thereof, and a display panel.
  • transparent conductive films have been widely used in the field of optoelectronic devices such as liquid crystal displays, touch screens, organic light-emitting diodes, and solar cells due to their combination of conductivity, light transmission, and bending resistance.
  • Common transparent conductive films are mainly indium tin oxide (ITO) film, metal mesh film, nano silver wire film, etc.
  • the ITO film technology is mature, but the raw material cost is high, the conductivity is limited, and it is not resistant to bending; the raw material of the metal mesh film is cheap, anti-electromagnetic interference, but the metal line is wide and there is Murray interference; silver nanowire The line width is small, and the conductive film prepared by it has the advantages of low square resistance, high light transmittance, and bending resistance.
  • the manufacturing method of the flexible electrode is mainly to transfer the nanowires in parallel on the flexible substrate. Under the action of external stress, the flexibility of the silver nanowires is limited, and the electrical properties and the service life of the electrodes are affected after fracture.
  • the present invention provides a flexible conductive film, a preparation method thereof, and a display panel, so as to solve the technical problem that the existing flexible conductive film has poor stability and limited flexibility, thereby causing the reliability and life of the flexible conductive film to be affected.
  • the invention provides a method for preparing a flexible conductive film, including:
  • Step S10 preparing a base film, and applying a pre-stretching stress to the base film
  • Step S20 forming a conductive layer on the pre-stretched base film
  • Step S30 releasing the pre-stretching stress applied to the base film, wherein the base film and the conductive layer are elastically contracted, and the conductive layer and the side of the base film close to the conductive layer The surface shrinks and is wavy.
  • the preparation method of the flexible conductive film further includes:
  • Step S40 forming a protective layer on the conductive layer.
  • the step S20 includes:
  • the materials of the first conductive layer and the second conductive layer are silver nano, 3,4-ethylenedioxythiophene/polyphenylene sulfonic acid, and graphene oxide.
  • the materials of the first conductive layer and the second conductive layer are silver nano, 3,4-ethylenedioxythiophene/polyphenylene sulfonic acid, and graphene oxide.
  • the step S20 includes:
  • the protective layer has the same film structure and material as the base film.
  • the material of the base film is one of bisamino-polydimethylsiloxane and polyurethane elastomer.
  • the present invention also provides a flexible conductive film, comprising: a base film and a conductive layer disposed on the base film, wherein the conductive layer and the surface of the base film close to the conductive layer are both wavy .
  • the conductive layer includes a first conductive layer disposed on the base film and a second conductive layer disposed on the first conductive layer.
  • the first conductive layer and the second conductive layer are both wavy.
  • the materials of the first conductive layer and the second conductive layer are silver nano, 3,4-ethylenedioxythiophene/polyphenylene sulfonic acid, and graphene oxide.
  • the materials of the first conductive layer and the second conductive layer are silver nano, 3,4-ethylenedioxythiophene/polyphenylene sulfonic acid, and graphene oxide.
  • the flexible conductive film further includes a protective layer disposed on the conductive layer.
  • the protective layer has the same film structure and material as the base film.
  • the material of the base film is one of bisamino-polydimethylsiloxane and polyurethane elastomer.
  • the present invention also provides a display panel, including: a base substrate and a flexible conductive film disposed on the base substrate, the conductive film includes a base film and a conductive layer disposed on the base film, wherein The conductive layer and the surface of the base film on the side close to the conductive layer are both wavy.
  • the conductive layer includes a first conductive layer disposed on the base film and a second conductive layer disposed on the first conductive layer.
  • the first conductive layer and the second conductive layer are both wavy.
  • the flexible conductive film further includes a protective layer disposed on the conductive layer.
  • the protective layer has the same film structure and material as the base film.
  • the material of the base film is one of bisamino-polydimethylsiloxane and polyurethane elastomer.
  • the method for preparing the flexible conductive film provided by the present invention can improve the flexibility and use stability of the conductive layer, thereby increasing the service life of the flexible conductive film.
  • Figure 1 is a preparation method of the flexible conductive film of the present invention
  • FIG. 2 is a schematic diagram of the three-dimensional structure of the flexible conductive film of the present invention.
  • 3 to 5 are schematic diagrams of the structure during the preparation process of the flexible conductive film according to the first embodiment of the present invention.
  • Fig. 6 is a front view of a flexible conductive film according to the second embodiment of the present invention.
  • the present invention is directed to the existing flexible conductive film. Because the existing conductive film has problems such as poor stability and limited flexibility, which further affects the reliability and service life of the conductive film, this embodiment can solve the defects.
  • the present invention provides a flexible conductive film 100, comprising a base film 10 and a conductive layer 20 disposed on the base film 10, the conductive layer 20 and the base film 10 are close to the conductive layer
  • the surface of one side of 20 is wavy.
  • the method for preparing the flexible conductive film 100 includes: step S10, preparing a base film 10, and applying a pre-stretching stress to the base film 10; step S20, pre-stretching the base film 10 A conductive layer 20 is formed on the film 10; in step S30, the pre-stretch stress applied on the base film 10 is released, wherein the base film 10 and the conductive layer 20 undergo elastic contraction, and the conductive layer 20 and the The surface of the base film 10 close to the conductive layer shrinks in a wave shape.
  • the flexible conductive film 100 further includes a protective layer 30 disposed on the conductive layer 20.
  • the preparation method further includes: forming the protective layer 30 on the conductive layer 20 after the step S30.
  • the material of the protective layer is the same as the material of the base film, and the material of the base film 10 is modified polydimethylsiloxane, such as bisamino-polydimethylsiloxane (H2N-PDMS). -NH2), the imine bond contained in it can undergo Schiff base reaction with polytriphenylaldehyde at room temperature to complete the healing. Therefore, when the base film 10 has cracks, it can self-heal at room temperature to complete the repair of cracks and improve The production yield of the flexible conductive film 100 can extend the service life of the flexible conductive film 100 to a certain extent.
  • polydimethylsiloxane such as bisamino-polydimethylsiloxane (H2N-PDMS).
  • H2N-PDMS bisamino-polydimethylsiloxane
  • the material of the base film 10 can also be a transparent polyurethane elastomer, which has high flexibility and transparency.
  • the material of the conductive layer 20 is one or a combination of silver nano, 3,4-ethylenedioxythiophene/polyphenylene sulfonic acid (PEDOT/PSS), and graphene oxide.
  • the conductive layer 20 of the inner layer has a zigzag wavy structure, and when the base film 10 of the outer layer is bisamino-polydimethylsiloxane, bisamino-polydimethylsiloxane itself has better
  • the elasticity when subjected to external tensile stress, the outer bisamino-polymethylsiloxane film is stretched, and the inner wavy conductive layer 20 can be stretched accordingly. It will break, so its conductivity will not be affected. When the stress disappears, the bisamino-polydimethylsiloxane film will elastically shrink, and the inner conductive layer 20 will resume its wave shape.
  • the sandwich structure can give the flexible conductive film better protection and reduce the damage to the conductive layer 20 caused by the mechanical external force during and after the actual production of the product; when the flexible conductive film is a semi-sandwich structure, it can meet the requirements of the flexible conductive film as a whole surface
  • the conductive electrode is used.
  • the flexible conductive film 100 in this embodiment includes a base film 10 and a conductive layer disposed on the base film 10, wherein the conductive layer and the base film are close to one of the conductive layers.
  • the side surfaces are all wavy.
  • the preparation method of the flexible conductive film 100 includes:
  • Step S10 preparing a base film 10, and applying a pre-stretching stress to the base film 10;
  • a bisamino-dimethylsiloxane film is prepared as the base film 10, and the transparency of the base film 10 is adjusted by pre-stretching stress, so that the transparency of the base film 10 reaches With a setting value, the transparency of the base film 10 is controlled within a range of 55% to 88%. When the stretch rate of the base film 10 is 50%, the transparency of the base film 10 is 75%.
  • Step S20 forming a conductive layer 20 on the pre-stretched base film 10;
  • step S20 a first conductive layer (not shown in the figure) is formed on the pre-stretched base film 10, and then a second conductive layer (not shown in the figure) is formed on the first conductive layer. Out).
  • the specific preparation method can refer to the prior art, and then transfer the silver nanowires to the pre-stretched base film 10 to form the first conductive layer; then, spin coating Method or inkjet printing method, coating a mixture of 3,4-ethylenedioxythiophene (PEDOT) and polyphenylene sulfonic acid (PSS) on the base film 10 to form a second conductive layer, and the second The conductive layer is a full-surface conductive film layer.
  • PEDOT 3,4-ethylenedioxythiophene
  • PSS polyphenylene sulfonic acid
  • step S30 the pre-stretching stress applied on the base film is released, wherein the base film 10 and the conductive layer 20 undergo elastic contraction, and the conductive layer 20 and the base film 10 The surface of one side close to the conductive layer 20 is all contracted and wavy;
  • the pre-stretched bisamino-polydimethylsiloxane film releases a certain external tension to make it elastically shrink.
  • the upper surface of the base film 10 (the surface on the side close to the conductive layer 20) A fixed regular wave-like folds are formed in the stretching direction, and the silver nanowires and the PSS/PEDOT film deposited on the film shrink accordingly, forming microscopic wave-like folds.
  • the flexible conductive film 100 can react with mesitylene aldehyde at room temperature after completing the subsequent production of finished products when cracks are generated during use to complete self-healing and crack repair. This self-healing process requires manual addition An appropriate amount of triphenylformaldehyde can be added manually after the preparation of the flexible conductive film 100, after the manufacturing process, or during use.
  • the conductive layer 20 formed by the preparation method has a wavy structure.
  • the wavy conductive layer 20 is not easy to be broken by external stress and damage its conductive performance due to the buffering characteristics of its physical structure. To achieve the effect of prolonging the service life.
  • the flexible conductive film can be applied to touch screens and display panels.
  • This embodiment also provides a display panel including a base substrate and a flexible conductive film disposed on the base substrate.
  • the flexible conductive film can refer to the above The preparation method is used for preparation, and will not be repeated here.
  • the flexible conductive film further includes a protective layer 30 disposed on the conductive layer 20, and the protective layer 30 covers the conductive layer 20.
  • a layer of flexible protective layer is added, so that the upper and lower surfaces of the conductive layer 20 form a protective flexible transparent material.
  • step S30 in the first embodiment another layer of bisamino-polydimethylsiloxane film, which is the same as the base film 10, is prepared, and the film is pressed on the conductive layer 20 by a molding method to form Protective layer 30.
  • the protective layer 30 can react with mesitylene aldehyde at room temperature to complete self-healing and crack repair.
  • the flexible conductive film in this embodiment has two upper and lower layers of flexible transparent material protection, which can improve the stability of PEDOT/PSS; the outer base film 10 and the protective layer 30 have self-healing properties, and the external force is very small. Damage can be self-repaired at room temperature, thereby extending the service life.
  • the structure of the flexible conductive film in this embodiment is the same as that of the first embodiment, and the preparation method of the flexible conductive film in this embodiment includes:
  • Step S10 preparing a base film, and applying a pre-stretching stress to the base film
  • a transparent polyurethane elastomer as a base film, and pre-stretch the base film.
  • the transparency of the polyurethane elastomer is relatively high. According to the transparency requirements of the base film, different types of polyurethane elastomers can be selected;
  • Step S20 forming a conductive layer on the pre-stretched base film
  • the second conductive layer prepare silver nanowires, and then transfer the silver nanowires to the base film to form the first conductive layer; then, prepare graphene oxide by the hummers method, and form a film on the base film by the chemical reduction method.
  • the second conductive layer First, prepare silver nanowires, and then transfer the silver nanowires to the base film to form the first conductive layer; then, prepare graphene oxide by the hummers method, and form a film on the base film by the chemical reduction method.
  • Step S30 releasing the pre-stretching stress applied on the base film, wherein the base film and the conductive layer are elastically contracted, and the conductive layer and the base film are close to the surface of the conductive layer. All shrink and become wavy.
  • the pre-stretched base film releases a certain external tension to make it elastically shrink, and the silver nanowires and graphene oxide deposited on the base film shrink accordingly to form a microscopic wave shape.
  • step S30 another layer of polyurethane elastomer can be prepared and pressed onto the conductive layer by a molding method to form a protective layer.
  • the two ends of the conductive layer can be connected.
  • Flexible electrodes forming a sandwich structure.
  • the method for preparing the flexible conductive film provided by the present invention can improve the flexibility and use stability of the conductive layer, thereby increasing the service life of the flexible conductive film.

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Abstract

一种柔性导电薄膜的制备方法，包括：制备基底薄膜，对基底薄膜施加预拉伸应力；在已进行预拉伸的基底薄膜上形成导电层；释放施加在基底薄膜上的预拉伸应力，基底薄膜和导电层发生弹性收缩，导电层和基底薄膜靠近导电层的一侧表面均收缩呈波浪状。能够提高导电层的柔韧性和使用稳定性，进而提高柔性导电薄膜的使用寿命。

Description

柔性导电薄膜及其制备方法、显示面板 技术领域
本发明涉及光学领域，尤其涉及一种柔性导电薄膜及其制备方法、显示面板。
 背景技术
近年来，柔性透明导电薄膜由于其兼具导电性、透光性、耐弯折性，被广泛应用于液晶显示器、触摸屏、有机发光二极管、太阳能电池等光电器件领域。常见的透明导电薄膜主要为氧化铟锡（Indium tin oxide，ITO）膜、金属网格膜、纳米银线膜等。
其中，ITO膜技术成熟，但原料成本高、导电性存在极限、且不耐弯折；金属网格膜的原料价格低廉、抗电磁干扰，但金属线较宽且存在莫瑞干涉；银纳米线线宽小，以其制备导电薄膜具有方阻低、透光度高、耐弯折的优点，但是当为降低电阻值而增大纳米线用量后，透明度下降显著，且现有的银纳米线柔性电极的制作方法主要是将纳米线平行转移在柔性基底上，在外界应力作用下，银纳米线的柔韧性有限，发生断裂后影响电性及电极的使用寿命。
综上所述，现有的各类柔性导电薄膜虽然有诸多优点，但在柔性电子的应用中，仍然在性能、可靠性、寿命等方面存在问题。
 技术问题
本发明提供一种柔性导电薄膜及其制备方法、以及显示面板，以解决现有的柔性导电薄膜的稳定性差、柔韧性有限，从而导致柔性导电薄膜的使用可靠性和寿命受到影响的技术问题。
 技术解决方案
为解决上述问题，本发明提供的技术方案如下：
本发明提供一种柔性导电薄膜的制备方法，包括：
步骤S10，制备基底薄膜，对所述基底薄膜施加预拉伸应力；
步骤S20，在已进行预拉伸的所述基底薄膜上形成导电层；
步骤S30，释放施加在所述基底薄膜上的预拉伸应力，其中，所述基底薄膜和所述导电层发生弹性收缩，所述导电层和所述基底薄膜的靠近所述导电层的一侧表面均收缩呈波浪状。
在本发明的一种实施例中，所述柔性导电薄膜的制备方法还包括：
步骤S40，在所述导电层上形成保护层。
在本发明的一种实施例中，所述步骤S20包括：
S201，在已进行预拉伸的所述基底薄膜上形成第一导电层；
S202，在所述第一导电层上形成第二导电层。
在本发明的一种实施例中，所述第一导电层和所述第二导电层的材料均为银纳米、3,4-乙烯二氧噻吩/聚苯烯磺酸、以及氧化石墨烯中的一种。
在本发明的一种实施例中，所述步骤S20包括：
S201，制备银纳米线，将所述银纳米线移至已进行预拉伸的所述基底薄膜上，形成所述第一导电层；
S202，在所述第一导电层上涂布3,4-乙烯二氧噻吩和聚苯烯磺酸的混合物，并干燥，形成所述第二导电层。
在本发明的一种实施例中，所述保护层与所述基底薄膜的膜层结构和材质相同。
在本发明的一种实施例中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
本发明还提供一种柔性导电薄膜，包括：基底薄膜和设置于所述基底薄膜上的导电层，其中，所述导电层和所述基底薄膜靠近所述导电层的一侧表面均为波浪状。
在本发明的一种实施例中，所述导电层包括设置于所述基底薄膜上的第一导电层和设置于所述第一导电层上的第二导电层。
在本发明的一种实施例中，所述第一导电层和所述第二导电层均为波浪状。
在本发明的一种实施例中，所述第一导电层和所述第二导电层的材料均为银纳米、3,4-乙烯二氧噻吩/聚苯烯磺酸、以及氧化石墨烯中的一种。
在本发明的一种实施例中，所述柔性导电薄膜还包括设置于所述导电层上的保护层。
在本发明的一种实施例中，所述保护层与所述基底薄膜的膜层结构和材质相同。
在本发明的一种实施例中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
本发明还提供一种显示面板，包括：衬底基板和设置于所述衬底基板上的柔性导电薄膜，所述导电薄膜包括基底薄膜和设置于所述基底薄膜上的导电层，其中，所述导电层和所述基底薄膜靠近所述导电层的一侧表面均为波浪状。
在本发明的一种实施例中，所述导电层包括设置于所述基底薄膜上的第一导电层和设置于所述第一导电层上的第二导电层。
在本发明的一种实施例中，所述第一导电层和所述第二导电层均为波浪状。
在本发明的一种实施例中，所述柔性导电薄膜还包括设置于所述导电层上的保护层。
在本发明的一种实施例中，所述保护层与所述基底薄膜的膜层结构和材质相同。
在本发明的一种实施例中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
 有益效果
本发明的有益效果为：本发明提供的柔性导电薄膜的制备方法，能够提高导电层的柔韧性和使用稳定性，进而提高柔性导电薄膜的使用寿命。
 附图说明
图1为本发明柔性导电薄膜的制备方法；
图2为本发明柔性导电薄膜的立体结构示意图；
图3~图5为本发明实施例一的柔性导电薄膜制备过程中的结构示意图；
图6为本发明实施例二的柔性导电薄膜的正视图。
 本发明的实施方式
以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是用以相同标号表示。
本发明针对现有的柔性导电薄膜，由于现有的导电薄膜存在稳定性差、柔韧度有限等问题，进而影响到导电薄膜的使用可靠性和使用寿命，本实施例能够解决该缺陷。
如图2所示，本发明提供一种柔性导电薄膜100，包括基底薄膜10和设置于所述基底薄膜10上的导电层20，所述导电层20和所述基底薄膜10靠近所述导电层20的一侧表面均为波浪状。
如图1所示，所述柔性导电薄膜100的制备方法包括：步骤S10，制备基底薄膜10，对所述基底薄膜10施加预拉伸应力；步骤S20，在已进行预拉伸的所述基底薄膜10上形成导电层20；步骤S30，释放施加在所述基底薄膜10上的预拉伸应力，其中，所述基底薄膜10和所述导电层20发生弹性收缩，所述导电层20和所述基底薄膜10靠近所述导电层的一侧表面均收缩呈波浪状。
如图6所示，所述柔性导电薄膜100还包括设置于所述导电层20上的保护层30。所述制备方法还包括：在所述步骤S30之后，在所述导电层20上形成所述保护层30。
所述保护层的材料与所述基底薄膜的材料相同，所述基底薄膜10的材料为改性后的聚二甲基硅氧烷，例如双氨基-聚二甲基硅氧烷（H2N-PDMS-NH2），其含有的亚胺键可与聚三苯甲醛在室温下进行席夫碱反应完成愈合，故当所述基底薄膜10出现裂纹时，可室温下自愈合，完成修复裂纹，提高所述柔性导电薄膜100的生产良率，并一定程度延长所述柔性导电薄膜100的使用寿命。
所述基底薄膜10的材料还可为透明的聚氨酯弹性体，聚氨酯弹性体的柔韧性及透明度均较高。
所述导电层20的材料为为银纳米、3,4-乙烯二氧噻吩/聚苯烯磺酸（PEDOT/PSS）、以及氧化石墨烯中的一种或多种组合。
内层的所述导电层20为曲折的波浪状结构，外层的所述基底薄膜10选用双氨基-聚二甲基硅氧烷时，双氨基-聚二甲基硅氧烷自身具有较好的弹性，当承受外界的拉伸应力时，外层的双氨基-聚甲基硅氧烷薄膜被拉伸，内层波浪状的导电层20可随之拉伸，在一定拉伸范围内不会发生断裂，故其导电性也并不会受影响，应力消失时，双氨基-聚二甲基硅氧烷薄膜发生弹性收缩，内层的导电层20则恢复其波浪形态。
三明治结构能够赋予柔性导电薄膜更好的保护，降低实际产品制作中后制程中的机械外力对导电层20的破坏；所述柔性导电薄膜为半三明治结构时，能够满足柔性导电薄膜作为整面性导通的电极使用。
下面结合具体实施例，对上述的柔性导电薄膜及其制备方法进行详细说明。
实施例一
如图2所示，本实施例中的柔性导电薄膜100包括基底薄膜10和设置于所述基底薄膜10上的导电层，其中，所述导电层和所述基底薄膜靠近所述导电层的一侧表面均为波浪状。
如图1所示，所述柔性导电薄膜100的制备方法包括：
步骤S10，制备基底薄膜10，对所述基底薄膜10施加预拉伸应力；
如图3和图4所示，首先，制备双氨基-二甲基硅氧烷薄膜作为基底薄膜10，并通过预拉伸应力调节该基底薄膜10的透明度，使得所述基底薄膜10的透明度达到设定值，所述基底薄膜10的透明度控制在55%~88%范围内，当所述基底薄膜10的拉伸率为50%时，所述基底薄膜10的透明度为75%。
步骤S20，在已进行预拉伸的所述基底薄膜10上形成导电层20；
在步骤S20中，先在已经预拉伸的所述基底薄膜10上形成第一导电层（图中未示出），之后在所述第一导电层上形成第二导电层（图中未示出）。
首先，制备银纳米线，具体的制备方法可参考现有技术，再将该银纳米线转移至已经预拉伸的所述基底薄膜10上，形成所述第一导电层；之后，利用旋涂法或喷墨打印法，将3,4-乙烯二氧噻吩（PEDOT）和聚苯烯磺酸（PSS）的混合物涂布在所述基底薄膜10上，形成第二导电层，所述第二导电层为整面式导电膜层。
如图5所示，步骤S30，释放施加在所述基底薄膜上的预拉伸应力，其中，所述基底薄膜10和所述导电层20发生弹性收缩，所述导电层20和所述基底薄膜10靠近所述导电层20的一侧表面均收缩呈波浪状；
将已预拉伸的双氨基-聚二甲基硅氧烷薄膜释放一定的外界拉力，使其发生弹性收缩，所述基底薄膜10的上表面（靠近所述导电层20一侧的表面）在拉伸方向上形成固定规律的波浪状的褶皱，沉积在薄膜的上银纳米线和PSS/PEDOT薄膜均随之发生收缩，形成微观形态的波浪状的褶皱。
所述柔性导电薄膜100在完成后续成品制作后，在使用过程中产生裂纹时，在室温下可与均三苯甲醛发生反应，完成自愈合和裂纹的修复，该自愈合过程需要人工添加适量三苯甲醛，可在柔性导电薄膜100制备完成后、后制程、或者使用过程中均可人工添加三苯甲醛。
该制备方法形成的导电层20为波浪状结构，在柔性导电薄膜100受到外界应力时，波浪形的导电层20由于自身物理结构的缓冲特性，不易受到外界应力破环而损害其导电性能，从达到延长使用寿命的效果。
所述柔性导电薄膜可应用于触摸屏和显示面板中，本实施例还提供一种显示面板，包括衬底基板和设置于所述衬底基板上的柔性导电薄膜，所述柔性导电薄膜可参考上述制备方法来制备，这里不再赘述。
实施例二
如图6所示，所述柔性导电薄膜还包括设置于所述导电层20上的保护层30，所述保护层30覆盖所述导电层20。
本实施例在实施例一的制备方法的基础上，增加一层柔性保护层，使得导电层20的上下表面形成具有保护作用的柔性透明材料。
在实施例一的步骤S30之后，制备与基底薄膜10相同的另外一层双氨基-聚二甲基硅氧烷薄膜，通过模压的方法，将该薄膜压合在所述导电层20上，形成保护层30。
同样地，所述保护层30在发生裂纹时，在室温下，可与均三苯甲醛发生反应，完成自愈合及裂纹的修复。
本实施例中的所述柔性导电薄膜具有上下两层柔性透明材料保护，能够提高PEDOT/PSS的使用稳定性；外层的基底薄膜10和保护层30具有自愈合性能，外力作用下的微小破坏可以在室温下完成自我修复，进而延长使用寿命。
实施例三
本实施例中的柔性导电薄膜的结构与实施例一相同，本实施例的柔性导电薄膜的制备方法包括：
步骤S10，制备基底薄膜，对所述基底薄膜施加预拉伸应力；
制备透明的聚氨酯弹性体作为基底薄膜，并对所述基底薄膜进行预拉伸，聚氨酯弹性体的透明度较高，根据基底薄膜对透明度的要求，可选择不同种类的聚氨酯弹性体；
步骤S20，在已进行预拉伸的所述基底薄膜上形成导电层；
首先制备银纳米线，再将银纳米线转移至所述基底薄膜上，形成第一导电层；之后，通过hummers法制备氧化石墨烯，通过化学还原法，在所述基底薄膜上成膜，形成第二导电层。
步骤S30，释放施加在所述基底薄膜上的预拉伸应力，其中，所述基底薄膜和所述导电层发生弹性收缩，所述导电层和所述基底薄膜靠近所述导电层的一侧表面均收缩呈波浪状。
将已经预拉伸的所述基底薄膜释放一定的外界拉力，使其发生弹性收缩，沉积在所述基底薄膜上的银纳米线及氧化石墨烯随之发生收缩，形成微观形态的波浪形状。
在其他实施例中，可在步骤S30之后，制备另外一层聚氨酯弹性体，通过模压的方法，压合在所述导电层上，形成保护层，将所述导电层的两端导通，可形成三明治结构的柔性电极。
有益效果：本发明提供的柔性导电薄膜的制备方法，能够提高导电层的柔韧性和使用稳定性，进而提高柔性导电薄膜的使用寿命。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种柔性导电薄膜的制备方法，其中，包括：
    步骤S10，制备基底薄膜，对所述基底薄膜施加预拉伸应力；
    步骤S20，在已进行预拉伸的所述基底薄膜上形成导电层；
    步骤S30，释放施加在所述基底薄膜上的预拉伸应力，其中，所述基底薄膜和所述导电层发生弹性收缩，所述导电层和所述基底薄膜的靠近所述导电层的一侧表面均收缩呈波浪状。
  2. 根据权利要求1所述的制备方法，其中，所述柔性导电薄膜的制备方法还包括：
    步骤S40，在所述导电层上形成保护层。
  3. 根据权利要求1所述的制备方法，其中，所述步骤S20包括：
    S201，在已进行预拉伸的所述基底薄膜上形成第一导电层；
    S202，在所述第一导电层上形成第二导电层。
  4. 根据权利要求3所述的制备方法，其中，所述第一导电层和所述第二导电层的材料均为银纳米、3,4-乙烯二氧噻吩/聚苯烯磺酸、以及氧化石墨烯中的一种。
  5. 根据权利要求4所述的制备方法，其中，所述步骤S20包括：
    S201，制备银纳米线，将所述银纳米线移至已进行预拉伸的所述基底薄膜上，形成所述第一导电层；
    S202，在所述第一导电层上涂布3,4-乙烯二氧噻吩和聚苯烯磺酸的混合物，并干燥，形成所述第二导电层。
  6. 根据权利要求2所述的制备方法，其中，所述保护层与所述基底薄膜的膜层结构和材质相同。
  7. 根据权利要求6所述的制备方法，其中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
  8. 一种柔性导电薄膜，其中，包括：
    基底薄膜；
    导电层，设置于所述基底薄膜上；其中，
    所述导电层和所述基底薄膜靠近所述导电层的一侧表面均为波浪状。
  9. 根据权利要求8所述的柔性导电薄膜，其中，所述导电层包括设置于所述基底薄膜上的第一导电层和设置于所述第一导电层上的第二导电层。
  10. 根据权利要求9所述的柔性导电薄膜，其中，所述第一导电层和所述第二导电层均为波浪状。
  11. 根据权利要求9所述的柔性导电薄膜，其中，所述第一导电层和所述第二导电层的材料均为银纳米、3,4-乙烯二氧噻吩/聚苯烯磺酸、以及氧化石墨烯中的一种。
  12. 根据权利要求8所述的柔性导电薄膜，其中，所述柔性导电薄膜还包括设置于所述导电层上的保护层。
  13. 根据权利要求12所述的柔性导电薄膜，其中，所述保护层与所述基底薄膜的膜层结构和材质相同。
  14. 根据权利要求8所述的柔性导电薄膜，其中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
  15. 一种显示面板，其中，包括：
    衬底基板；
    柔性导电薄膜，设置于所述衬底基板上，所述导电薄膜包括基底薄膜和设置于所述基底薄膜上的导电层；其中，
    所述导电层和所述基底薄膜靠近所述导电层的一侧表面均为波浪状。
  16. 根据权利要求15所述的柔性导电薄膜，其中，所述导电层包括设置于所述基底薄膜上的第一导电层和设置于所述第一导电层上的第二导电层。
  17. 根据权利要求16所述的柔性导电薄膜，其中，所述第一导电层和所述第二导电层均为波浪状。
  18. 根据权利要求15所述的柔性导电薄膜，其中，所述柔性导电薄膜还包括设置于所述导电层上的保护层。
  19. 根据权利要求18所述的柔性导电薄膜，其中，所述保护层与所述基底薄膜的膜层结构和材质相同。
  20. 根据权利要求15所述的柔性导电薄膜，其中，所述基底薄膜的材料为双氨基-聚二甲基硅氧烷、聚氨酯弹性体中的一种。
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