WO2020001002A1 - 触控面板及其制作方法、显示装置 - Google Patents

触控面板及其制作方法、显示装置 Download PDF

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Publication number
WO2020001002A1
WO2020001002A1 PCT/CN2019/071229 CN2019071229W WO2020001002A1 WO 2020001002 A1 WO2020001002 A1 WO 2020001002A1 CN 2019071229 W CN2019071229 W CN 2019071229W WO 2020001002 A1 WO2020001002 A1 WO 2020001002A1
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Prior art keywords
touch panel
layer
conductive layer
region
area
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Ceased
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PCT/CN2019/071229
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English (en)
French (fr)
Inventor
金慧娇
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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Priority to US16/716,399 priority Critical patent/US10976852B2/en
Publication of WO2020001002A1 publication Critical patent/WO2020001002A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Definitions

  • the present application relates to the field of display technology, and in particular, to a touch panel, a method for manufacturing the touch panel, and a display device.
  • Touch panels have gained more and more applications in display technology fields such as tourist guide systems, ATMs, portable electronic products, and industrial control systems due to their convenient use.
  • the material of the touch electrodes of a conventional touch panel is usually indium tin oxide (ITO).
  • ITO indium tin oxide
  • the ITO film has limited the development of flexibility of the touch panel due to its brittleness, conductivity, and light transmittance.
  • the industry has been working on developing alternative materials for ITO.
  • nano-metal wires have excellent mechanical properties, especially nano-silver wires have excellent electrical conductivity, and at the same time, due to their nano-scale size effects, they have excellent Because of its light transmittance and flex resistance, it can be used as a material for touch electrodes instead of ITO.
  • the touch effects of the existing touch panels are not ideal, and it is difficult to realize the design requirements of narrow frames.
  • the technical problem to be solved by the present application is to provide a touch panel, a manufacturing method thereof, and a display device, so as to improve the touch effect of the touch panel, and can meet the design requirements of the narrow bezel and the market demand of the display device.
  • an embodiment of the present application provides a touch panel, where the touch panel includes:
  • a substrate having a first region and a second region surrounding the first region
  • a routing layer on the second area A routing layer on the second area
  • the conductive layer is located on the first region and directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area of the touch panel.
  • an effective area in which the conductive layer directly contacts the wiring layer is greater than or equal to 0.25 mm 2.
  • the touch panel further includes a cover layer on the conductive layer.
  • the cover layer is an insulating glue layer.
  • a material of the cover layer includes optical glue.
  • the material of the conductive layer includes nano metal wires
  • the material of the wiring layer includes silver wire, gold wire, indium tin oxide, metal mesh or graphene. One or more.
  • the conductive layer is mesh-shaped; and the cover layer is partially embedded in the conductive layer in a thickness direction thereof.
  • the conductive layer is a nano-silver wire layer
  • the nano-silver wire in the nano-silver wire layer has a line length between 10 microns and 300 microns, and the nano-silver The diameter of the wire is less than 500 nanometers, and the ratio of the wire length to the wire diameter is greater than 10.
  • the substrate is a rigid substrate or a flexible substrate.
  • an embodiment of the present application further provides a display device including the touch panel described above, wherein the conductive layer serves as a touch electrode of the display device, and the wiring layer serves as a touch electrode.
  • the interconnection of the touch electrodes, and the lead-out area corresponds to a frame area of the display device.
  • an embodiment of the present application further provides a method for manufacturing a touch panel, including:
  • a conductive layer is formed, the conductive layer is located on the first region and directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area.
  • a manner of forming the wiring layer includes printing, sputtering, or evaporation.
  • the method for forming the conductive layer includes inkjet, spreading, gravure printing, letterpress printing, flexo printing, nanoimprinting, screen printing, doctor blade coating, Spin coating, pin painting, sandwich coating or flow coating.
  • the manufacturing method further includes forming a cover layer on the conductive layer.
  • the touch panel in the embodiment of the present application includes: a substrate having a first region and a second region surrounding the first region; a wiring layer on the second region; and a conductive layer on the second region.
  • the first area directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area of the touch panel.
  • the manufacturing method of the touch panel includes: providing a substrate, the substrate having a first region and a second region surrounding the first region; forming a wiring layer, the wiring layer being located on the second region; And forming a conductive layer, the conductive layer is located on the first region and directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area.
  • the conductive layer directly covers a part of the wiring layer, the wiring layer and the conductive layer are in direct contact, so that the effective contact area between the two is easily controlled, which is beneficial to stabilize the contact resistance between the two. Therefore, the touch effect of the touch panel is improved; in addition, because part of the trace layer is covered by the conductive layer, and the exposed trace layer serves as a trace lead-out area, the trace can be reduced accordingly.
  • the area of the lead-out area; further, the exposed routing layer corresponds to the border area of the touch panel, which can reduce the size of the border area of the touch panel, so the touch panel can also achieve a narrow border Design requirements to meet the market demand for narrow bezels of display devices.
  • an effective area in which the conductive layer directly contacts the wiring layer is greater than or equal to 0.25 square millimeters, which can achieve a good electrical connection between the conductive layer and the wiring layer, so that the touch panel The signal transmission is good and the anti-interference ability is strong.
  • a cover layer is formed on the conductive layer, the cover layer can increase the adhesion between the conductive layer and the substrate, can improve the conductivity and sensitivity of the touch panel, and further improve the touch. Control panel touch effect.
  • FIG. 1 is a flowchart of a method for manufacturing a touch panel according to an embodiment of the present application
  • FIGS. 2 to 4 are schematic structural diagrams corresponding to corresponding steps in a method for manufacturing a touch panel according to an embodiment of the present application.
  • a nano-silver wire solution is usually directly coated on a substrate to form a nano-silver wire conductive layer.
  • the conductive layer of nano-silver wire is only overlapped by weak intermolecular forces. Therefore, the bonding strength of the conductive layer of nano-silver wire and the substrate is poor, and it is easy to slip during the bending process and cause touch.
  • the coated overlay layer can improve the nanosilver wire conductive layer and the nanosilver wire conductive layer.
  • the effective contact area refers to an area of a portion of the portion where the conductive layer and the wiring layer are in contact with each other that can play a conductive role. Therefore, on the basis of the above structure, in order to ensure the touch effect of the touch panel, it is necessary to expand the contact area between the nano silver wire conductive layer and the wiring layer, and the contact area determines the border area of the touch panel. Size. Therefore, the touch panel cannot meet the design requirements of narrow bezels, and thus it is difficult to meet the market demand of display devices.
  • an embodiment of the present application provides a touch panel including: a substrate having a first region and a second region surrounding the first region; a wiring layer on the second region; And a conductive layer, which is located on the first region and directly covers a part of the trace layer, and the exposed trace layer serves as a trace lead-out area.
  • the touch panel can also realize the design requirements of a narrow frame, thereby meeting the market demand for a narrow frame of a display device. .
  • an embodiment of the present application also provides a method for manufacturing a touch panel.
  • the method for manufacturing a touch panel according to an embodiment of the present application includes:
  • Step S1 providing a substrate having a first region and a second region surrounding the first region;
  • Step S2 forming a routing layer, the routing layer is located on the second region.
  • Step S3. A conductive layer is formed.
  • the conductive layer is located on the first region and directly covers a part of the wiring layer, and the exposed wiring layer is used as a wiring lead-out area.
  • the manufacturing method first forms the trace layer on the second region, and then forms a conductive layer, the conductive layer is located on the first region and directly covers a part of the trace layer, and the exposed traces
  • the layer serves as a routing lead-out area, so that the routing layer is in direct contact with the conductive layer, and the area of the routing lead-out area can be reduced. Therefore, the manufacturing method can not only improve the touch effect of the touch panel, but also The design requirements of the narrow bezel can be realized, thereby meeting the market demand of the narrow bezel of the display device.
  • FIGS. 1 to 4 The embodiments of the touch panel, the manufacturing method thereof, and the display device are listed in more detail below in conjunction with FIGS. 1 to 4 to clearly explain the content of the present application. It should be clear that the content of the present application is not limited to the following For example, other improvements by the ordinary technical means of those skilled in the art are also within the scope of the present application. It should be noted that the drawings are in a very simplified form and all use inaccurate proportions, which are only used to facilitate and clearly explain the purpose of the embodiments of the present application.
  • step S1 is performed to provide a substrate 10 having a first region A1 and a second region A2 surrounding the first region A1, as shown in FIG. 2.
  • the base 10 may have a square shape, and the second region A2 has a square ring shape.
  • the substrate 10 is generally made of a transparent insulating material.
  • the substrate 10 may be a rigid substrate, and the material of the rigid substrate may be glass, metal, or ceramic.
  • the substrate 10 may also be a flexible substrate.
  • the material of the flexible substrate may be, but is not limited to, acrylic, polymethyl methacrylate (PMMA), polyacrylonitrile-butadiene-styrene (ABS), polyamide (PA), polyimide (PI), Polybenzimidazole polybutene (PB), polybutylene terephthalate (PBT), polycarbonate (PC), polyetheretherketone (PEEK), polyetherimide (PEI), polyether Sulfone (PES), polyethylene (PE), polyethylene terephthalate (PET), polyethylene tetrafluoroethylene (ETFE), polyethylene oxide, polyglycolic acid (PGA), polymethylpentyl Ene (PMP), polyoxymethylene (POM), polyphenylene ether (PPE), polypropylene (PP), polystyrene (PS), polytetrafluoroethylene (PTFE), polyurethane (PU), polyvinyl chloride (PVC) , Polyvinyl fluoride (PVF), polyvinyliden
  • step S2 is performed to form a routing layer 11, and the routing layer 11 is located on the second area A2, as shown in FIG. 2.
  • the material of the wiring layer 11 includes one or more of gold wire, silver wire, indium tin oxide, metal mesh or graphene.
  • the specific way of forming the wiring layer 11 includes, but is not limited to, printing (for example, gravure printing, letterpress printing, flexo printing or transfer printing, etc.), sputtering, or evaporation can be used.
  • the wiring layer 11 is used as an interconnection line for subsequent touch electrodes.
  • step S3 is performed to form a conductive layer 12, which is located on the first area A1 and directly covers a part of the wiring layer 11, and the exposed wiring layer 11 serves as a routing lead-out area B, as shown in FIG. 3 is shown.
  • the conductive layer 12 is used as a touch electrode of the touch panel.
  • the conductive layer 12 corresponds to the touch area of the touch panel
  • the wiring lead-out area B corresponds to the touch area of the touch panel. Border area.
  • the touch area is a display area of a display device, and is also referred to as a viewable area.
  • the viewable area is generally used for light-transmissive display, and the frame area is generally opaque to highlight the display content of the viewable area. . Therefore, the wiring layer 11 and the conductive layer 12 are in direct contact, so that the effective contact area between the two is easily controlled, which is beneficial to stabilize the contact resistance between the two, thereby improving the touch of the touch panel.
  • the area of the wiring lead-out area B can be reduced accordingly, that is, the border area of the touch panel can be reduced. Size, which can achieve the design requirements of narrow borders.
  • the material of the conductive layer 12 includes nano metal wires, which may be, but not limited to, nano gold wires or nano silver wires.
  • the conductive layer 12 is preferably a nano-silver wire layer.
  • the nano-silver wire in the nano-silver wire layer may have a line length between 10 micrometers and 300 micrometers, a nano-silver wire may have a diameter (or line width) of less than 500 nanometers, and its aspect ratio (line length and line Diameter ratio) can be greater than 10.
  • the method for forming the conductive layer 12 includes, but is not limited to, inkjet, spreading, gravure printing, letterpress printing, flexo printing, nanoimprinting, screen printing, doctor blade coating, spin coating, stylus plotting, Sandwich coating or flow coating. Further, in order to ensure that the touch panel has a better touch effect, an effective area in which the conductive layer 12 directly contacts the wiring layer 11 is greater than or equal to 0.25 square millimeters, so that the conductive layer can be realized.
  • the good electrical connection between 12 (touch electrode) and the wiring layer 11 (interconnect line of the touch electrode) makes the signal transmission of the touch panel good and strong anti-interference ability.
  • a cover layer 13 may be further formed on the conductive layer 12 after completing the above steps, as shown in FIG. 4.
  • the cover layer 13 may be an insulating glue layer, such as one or more of phenolic resin, polyvinyl chloride resin, transparent optical glue, and other materials.
  • the material of the cover layer 13 is transparent optical glue.
  • the step of forming the cover layer 13 may be: applying a transparent optical glue solution on the conductive layer 12 by a spraying process; and then heating and baking. Dry and cure to form the cover layer 13. Further, the transparent optical glue solution has fluidity, and the conductive layer 12 is generally in a network shape.
  • the transparent optical glue solution will penetrate into the conductive layer 12 so that the cover layer formed after curing. 13 will be at least partially embedded in the conductive layer 12 in its thickness direction, so that the nano-silver wires can be better adhered to the substrate 10, so that the nano-silver wires are not easily moved and the overlap is more firm. , Thereby increasing the conductivity and sensitivity of the touch panel.
  • the wiring layer 11 is first formed on the second region A2, and then a conductive layer 12 is formed.
  • the conductive layer 12 is located on the first region A1 and directly covers a part of The routing layer 11 is described, and the exposed routing layer 11 is used as the routing lead-out area B, so that the routing layer 11 is in direct contact with the conductive layer 12, and the area of the routing lead-out area B can be reduced.
  • the manufacturing method can not only improve the touch effect of the touch panel, but also realize the design requirements of a narrow frame.
  • the touch panel formed by the above manufacturing method includes: a substrate 10 having a first region A1 and a second region A2 surrounding the first region A1; Wire layer 11; a conductive layer 12 located on the first area A1 and directly covering a part of the wiring layer 11, the effective area of the wiring layer 11 directly contacting the conductive layer 12 is greater than or equal to 0.25 square millimeters
  • the exposed wiring layer 11 is used as the wiring lead-out area B of the touch panel; and the cover layer 13 on the conductive layer 12. Because the wiring layer 11 and the conductive layer 12 are in direct contact, the effective contact area between them is easy to control, which is beneficial to stabilize the contact resistance between the two, thereby improving the touch effect of the touch panel.
  • the touch panel can also realize the design requirements of a narrow frame.
  • the touch panel is not limited to the above manufacturing method.
  • this embodiment provides a display device including the touch panel described above, wherein the conductive layer 12 is used as a touch electrode of the display device, and the wiring layer 11 is used as an interconnection line of the touch electrode of the display device.
  • the routing lead-out area B corresponds to the frame area of the display device. Therefore, the display device can meet the market demand for a narrow frame of the display device.
  • the display device may be, but is not limited to, any product or component having a display function, such as a liquid crystal display panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the touch panel of the present application includes: a substrate having a first region and a second region surrounding the first region; a wiring layer on the second region; and a conductive layer on the substrate.
  • the first area directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area of the touch panel.
  • the manufacturing method of the touch panel includes: providing a substrate, the substrate is divided into a first region and a second region surrounding the first region; forming a routing layer, and the routing layer is located on the second region And forming a conductive layer, the conductive layer is located on the first region and directly covers a part of the wiring layer, and the exposed wiring layer serves as a wiring lead-out area.
  • the conductive layer directly covers a part of the wiring layer, the wiring layer and the conductive layer are in direct contact, so that the effective contact area between the two is easily controlled, which is beneficial to stabilize the contact resistance between the two. Therefore, the touch effect of the touch panel is improved; moreover, the exposed wiring layer corresponds to the border area of the touch panel, because part of the wiring layer has been covered by the conductive layer, and the exposed wiring layer As the routing lead-out area, the area of the routing lead-out area can be reduced accordingly, that is, the size of the border area of the touch panel can be reduced. Therefore, the touch panel can also realize the design requirements of narrow border To meet the market demand for narrow bezels of display devices.
  • an effective area in which the conductive layer directly contacts the wiring layer is greater than or equal to 0.25 square millimeters, which can achieve a good electrical connection between the conductive layer and the wiring layer, so that the touch panel The signal transmission is good and the anti-interference ability is strong.
  • a cover layer is formed on the conductive layer, the cover layer can increase the adhesion between the conductive layer and the substrate, can improve the conductivity and sensitivity of the touch panel, and further improve the touch. Control panel touch effect.

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  • General Engineering & Computer Science (AREA)
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Abstract

一种触控面板及其制作方法、显示装置。触控面板包括：基底（10），基底（10）具有第一区域（A1）和围绕所述第一区域（A1）的第二区域（A2）；走线层（11），位于第二区域（A2）上；以及导电层（12），位于第一区域（A1）上且直接覆盖部分走线层（11），暴露的走线层（11）作为走线引出区（B）。触控面板的制作方法包括：提供基底（10），基底分为第一区域（A1）和围绕所述第一区域（A1）的第二区域（A2）；形成走线层（11），走线层（11）位于第二区域（A2）上；以及形成导电层（12），导电层（12）位于第一区域（A1）上且直接覆盖部分走线层（11），暴露的走线层（11）作为走线引出区（B）。

Description

触控面板及其制作方法、显示装置 技术领域
本申请涉及显示技术领域，特别涉及一种触控面板、触控面板的制作方法以及显示装置。
背景技术
触控面板(Touch Panel)因其方便的使用方式在游客导览系统、自动柜员机、可携式电子产品以及工业控制系统等显示技术领域获得了越来越多的应用。传统的触控面板的触控电极的材料通常为氧化铟锡(ITO)，但是，ITO薄膜由于自身的脆性、导电性及透光率等问题而限制了触控面板向柔性化发展。目前，产业界一直在致力于开发ITO的替代材料，其中，纳米金属线具有较优异的力学特性，特别是纳米银线具有优良的导电性，同时由于其纳米级别的尺寸效应，使得其具有优异的透光性与耐曲挠性，因此，可用其替代ITO作为触控电极的材料。然而，现有的触控面板的触控效果不够理想，且难以实现窄边框的设计要求。
发明内容
本申请所要解决的技术问题是提供一种触控面板及其制作方法、显示装置，以提高触控面板的触控效果，且可以满足窄边框的设计要求，满足显示装置的市场需求。
为解决上述技术问题及相关问题，根据本申请的一方面，本申请的实施例提供了一种触控面板，其中，所述触控面板包括：
基底，所述基底具有第一区域和围绕所述第一区域的第二区域；
走线层，位于所述第二区域上；以及
导电层，位于所述第一区域上且直接覆盖部分所述走线层，暴露的所述走线层作为所述触控面板的走线引出区。
可选的，在所述的触控面板中，所述导电层与所述走线层直接接触的有效面积大于或者等于0.25平方毫米。
可选的，所述触控面板还包括位于所述导电层上的覆盖层。
可选的，在所述的触控面板中，所述覆盖层为绝缘胶层。
可选的，在所述的触控面板中，所述覆盖层的材质包括光学胶。
可选的，在所述的触控面板中，所述导电层的材质包括纳米金属线，所述走线层的材质包括银线、金线、氧化铟锡、金属筛网或石墨烯中的一种或多种。
可选的，在所述的触控面板中，所述导电层呈网状；且所述覆盖层在其厚度方向上部分嵌入所述导电层中。
可选的，在所述的触控面板中，所述导电层为纳米银线层，所述纳米银线层中的纳米银线的线长在10微米至300微米之间，所述纳米银线的线径小于500纳米，且所述线长与所述线径之比大于10。
可选的，在所述的触控面板中，所述基底为刚性基底或柔性基底。
根据本申请的另一方面，本申请的实施例还提供了一种包括上述触控面板的显示装置，其中，所述导电层作为所述显示装置的触控电极，所述走线层作为所述触控电极的互连线，所述走线引出区对应所述显示装置的边框区。
根据本申请的又一方面，本申请的实施例还提供了一种触控面板的制作方法，包括：
提供基底，所述基底具有第一区域和围绕所述第一区域的第二区域；
形成走线层，所述走线层位于所述第二区域上；以及
形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的所述走线层作为走线引出区。
可选的，在所述的触控面板的制作方法中，形成所述走线层的方式包括印刷、溅射或者蒸镀。
可选的，在所述的触控面板的制作方法中，形成所述导电层的方式包括喷墨、撒播、凹版印刷、凸版印刷、柔印、纳米压印、丝网印刷、刮刀涂布、旋转涂布、针绘、夹缝式涂布或流涂。
可选的，所述制作方法还包括在所述导电层上形成覆盖层。
与现有技术相比，本申请的实施例具有以下有益效果：
本申请实施例中的触控面板包括：基底，所述基底具有第一区域和围绕所述第一区域的第二区域；走线层，位于所述第二区域上；以及导电层，位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为所述触控面板的走线引出区。所述触控面板的制作方法包括：提供基底，所述基底具有第一区域和围绕所述第一区域的第二区域；形成走线层，所述走线层位于所述第二区域上；以及形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为走线引出区。因所述导电层直接覆盖部分所述走线层，则所述走线层与所述导电层直接接触，使得两者之间的有效接触面积容易控制，有利于稳定两者之间的接触电阻，从而提高所述触控面板的触控效果；另外，因为部分所述走线层被所述导电层覆盖，暴露的走线层作为走线引出区，所以可以相应地减小所述走线引出区的面积；再者，暴露的走线层对应所述触控面板的边框区，这样可以减小所述触控面板的边框区的尺寸，因此，所述触控面板还可以实现窄边框的设计需求，从而满足显示装置窄边框的市场需求。
进一步的，所述导电层与所述走线层直接接触的有效面积大于或者等于0.25平方毫米，可以实现所述导电层与所述走线层之间良好的电连接，使所述触控面板的信号传输良好，抗干扰能力强。
再进一步的，在所述导电层上形成覆盖层，所述覆盖层能够增加所述导电层与所述基底的粘附力，能够提高所述触控面板的导电性和灵敏性，进一步提高触控面板的触控效果。
附图说明
图1为本申请实施例提供的触控面板的制作方法的流程图；
图2至图4为本申请实施例中所述触控面板的制作方法中相应步骤对应的结构示意图。
具体实施方式
发明人发现，在纳米银线触控面板的制备工艺中，通常是将纳米银线溶液直接涂布在基底上以形成纳米银线导电层。但是，纳米银线导电层仅凭较弱的分子间作用力搭接在一起，因此，纳米银线导电层与基底的结合强度较差，很 容易在弯折过程中发生滑移，出现触控面板的电阻较高和电阻不稳定的现象。于是，发明人尝试在纳米银线导电层上再涂覆覆盖层(over coating)，通常覆盖层为透明的绝缘胶层，如光学胶层，涂覆的覆盖层能够提高纳米银线导电层与基底之间的附着力；但是，由于走线层形成在覆盖层之上，则涂覆的覆盖层会降低纳米银线导电层与走线层的有效接触面积，增加两者间的接触电阻，导致触控面板的触控效果下降。其中，所述有效接触面积是指所述导电层和所述走线层接触的部分中可以起到导电作用的部分的面积。于是，在上述结构的基础上，为了保证触控面板的触控效果，需要扩大所述纳米银线导电层与所述走线层的接触面积，而该接触面积决定了触控面板的边框区的尺寸大小。因此，该触控面板无法满足窄边框的设计需求，进而难以满足显示装置的市场需求。
基于上述发现，本申请的实施例提供一种触控面板包括：基底，所述基底具有第一区域和围绕所述第一区域的第二区域；走线层，位于所述第二区域上；以及导电层，位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为走线引出区。因所述走线层与所述导电层直接接触，使得两者之间的有效接触面积容易控制，有利于稳定两者之间的接触电阻，从而提高所述触控面板的触控效果；另外，因为部分所述走线层已被所述导电层覆盖，暴露的走线层作为走线引出区，这样可以相应地减小所述走线引出区的面积；再者，暴露的走线层对应所述触控面板的边框区，这样可以减小所述触控面板的边框区的尺寸，因此，所述触控面板还可以实现窄边框的设计需求，从而满足显示装置窄边框的市场需求。
同时，本申请的实施例还提供一种触控面板的制作方法，如图1所示，本申请实施例的触控面板的制作方法包括：
步骤S1、提供基底，所述基底具有第一区域和围绕所述第一区域的第二区域；
步骤S2、形成走线层，所述走线层位于所述第二区域上；以及
步骤S3、形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为走线引出区。
所述制作方法首先在所述第二区域上形成了所述走线层，然后形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作 为走线引出区，使得所述走线层与所述导电层直接接触，且可以减小走线引出区的面积，因此，所述制作方法不仅能够提高触控面板的触控效果，还可实现窄边框的设计需求，从而满足显示装置窄边框的市场需求。
以下结合图1至图4更详细的列举所述触控面板及其制作方法、显示装置的实施例，以清楚说明本申请的内容，应当明确的是，本申请的内容并不限制于以下实施例，其它通过本领域普通技术人员的常规技术手段的改进亦在本申请的思想范围之内。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本申请实施例的目的。
首先，执行步骤S1，提供基底10，所述基底10具有第一区域A1和围绕所述第一区域A1的第二区域A2，如图2所示。
本实施例中，所述基底10可以呈方形，则所述第二区域A2呈方形环状。所述基底10通常由透明的绝缘材料制成，所述基底10可以为刚性基底，所述刚性基底的材质可以是如玻璃、金属、或陶瓷等；所述基底10也可以为柔性基底，所述柔性基底的材质可以但不限于为亚克力、聚甲基丙烯酸甲酯(PMMA)、聚丙烯腈-丁二烯-苯乙烯(ABS)、聚酰胺(PA)、聚酰亚胺(PI)、聚苯并咪唑聚丁烯(PB)、聚对苯二甲酸丁二醇酯(PBT)、聚碳酸酯(PC)、聚醚醚酮(PEEK)、聚醚酰亚胺(PEI)、聚醚砜(PES)、聚乙烯(PE)、聚对苯二甲酸乙二醇酯(PET)、聚乙烯四氟乙烯(ETFE)、聚环氧乙烷、聚乙醇酸(PGA)、聚甲基戊烯(PMP)、聚甲醛(POM)、聚苯醚(PPE)、聚丙烯(PP)、聚苯乙烯(PS)、聚四氟乙烯(PTFE)、聚氨酯(PU)、聚氯乙烯(PVC)、聚氟乙烯(PVF)、聚偏二氯乙烯(PVDC)、聚偏二氟乙烯(PVDF)或苯乙烯-丙烯腈(SAN)等。本实施例中，所述柔性基底的材质为聚酰亚胺。
接着，执行步骤S2，形成走线层11，所述走线层11位于所述第二区域A2上，如图2所示。
较佳的，所述走线层11的材质包括金线、银线、氧化铟锡、金属筛网或石墨烯中的一种或多种。具体形成所述走线层11的方式包括但不限于印刷(如可以采用凹版印刷、凸版印刷、柔印或转印等)、溅射或者蒸镀等。所述走线层11用作后续触控电极的互连线。
然后，执行步骤S3，形成导电层12，所述导电层12位于所述第一区域A1 上且直接覆盖部分所述走线层11，暴露的走线层11作为走线引出区B，如图3所示。
所述导电层12作为所述触控面板的触控电极，相应的，所述导电层12对应所述触控面板的触控区域，而所述走线引出区B对应所述触控面板的边框区。所述触控区域即显示装置的显示区域，也被称为可视区，所述可视区通常用于透光显示，所述边框区通常不透光以突出所述可视区的显示内容。因而，所述走线层11与所述导电层12直接接触，使得两者之间的有效接触面积容易控制，有利于稳定两者之间的接触电阻，从而可以提高所述触控面板的触控效果；而且，因为部分所述走线层11已被所述导电层12覆盖，则可以相应地减小所述走线引出区B的面积，即可以减小所述触控面板的边框区的尺寸，从而可以实现窄边框的设计需求。
较佳的，所述导电层12的材质包括纳米金属线，其可以但不限于为纳米金线或纳米银线。本实施例中，由于银在一般状态下为银白色金属，且为不透明材料，导电性极佳，因此所述导电层12优选为纳米银线层。所述纳米银线层中的纳米银线的线长可以在10微米至300微米之间，纳米银线的线径(或线宽)可以小于500纳米，且其长宽比(线长与线径之比)可以大于10。形成所述导电层12的方式包括但不限于：喷墨、撒播、凹版印刷、凸版印刷、柔印、纳米压印、丝网印刷、刮刀涂布、旋转涂布、针绘(stylus plotting)、夹缝式涂布或流涂。进一步的，为了保证所述触控面板具有更好的触控效果，所述导电层12与所述走线层11直接接触的有效面积大于或者等于0.25平方毫米，这样，可以实现所述导电层12(触控电极)与所述走线层11(所述触控电极的互连线)之间良好的电连接，使所述触控面板的信号传输良好、抗干扰能力强。
此外，为了进一步增强所述导电层12与所述基底10的粘附力，在完成上述步骤后，还可以在所述导电层12上形成覆盖层13，如图4所示。所述覆盖层13可以为绝缘胶层，如酚醛树脂、聚氯乙烯树脂、透明光学胶等材料中的一种或多种。本实施例中，所述覆盖层13的材料为透明光学胶，形成所述覆盖层13的步骤可以是：将透明光学胶溶液采用喷涂工艺涂布在所述导电层12上；再进行加热烘干，固化形成所述覆盖层13。进一步，所述透明光学胶溶液具有流动性，而所述导电层12通常呈网状，在未固化前，所述透明光学胶溶液会渗入所 述导电层12中，使得固化后形成的覆盖层13在其厚度方向上至少部分会嵌入所述导电层12中，可以使纳米银线更好地附着在所述基底10上，从而使所述纳米银线之间不易发生移动，搭接更加牢固，进而增加所述触控面板的导电性和灵敏性。
上述触控面板的制作方法首先在所述第二区域A2上形成了所述走线层11，然后，形成导电层12，所述导电层12位于所述第一区域A1上且直接覆盖部分所述走线层11，暴露的走线层11作为走线引出区B，使得所述走线层11与所述导电层12直接接触，且可以减小走线引出区B的面积，因此，所述制作方法不仅能够提高触控面板的触控效果，还可实现窄边框的设计需求。
相应的，通过上述制作方法形成的触控面板包括：基底10，所述基底10具有第一区域A1和围绕所述第一区域A1的第二区域A2；位于所述第二区域A2上的走线层11；位于所述第一区域A1上且直接覆盖部分所述走线层11的导电层12，所述走线层11与所述导电层12直接接触的有效面积大于或者等于0.25平方毫米，暴露的走线层11作为所述触控面板的走线引出区B；位于所述导电层12上的覆盖层13。因所述走线层11与所述导电层12直接接触，使得两者之间的有效接触面积容易控制，有利于稳定两者之间的接触电阻，从而提高所述触控面板的触控效果；另外，因为部分所述走线层11已被所述导电层12覆盖，暴露的走线层11作为走线引出区B，所以可以相应地减小所述走线引出区B的面积，再者，暴露的走线层对应所述触控面板的边框区，这样可以减小所述触控面板的边框区的尺寸，因此，所述触控面板还可以实现窄边框的设计需求。
显然，所述触控面板并不只限于上述制作方法得到。
最后，本实施例提供了一种包括上述触控面板的显示装置，其中，所述导电层12作为显示装置的触控电极，所述走线层11作为显示装置的触控电极的互连线，所述走线引出区B对应显示装置的边框区，于是，所述显示装置可以满足显示装置窄边框的市场需求。所述显示装置可以但不限于为液晶显示面板、电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
综上，本申请的触控面板包括：基底，所述基底具有第一区域和围绕所述第一区域的第二区域；走线层，位于所述第二区域上；以及导电层，位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为所述触控面板的走线引出区。所述触控面板的制作方法包括：提供基底，所述基底分为第一区域和围绕所述第一区域的第二区域；形成走线层，所述走线层位于所述第二区域上；以及形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的走线层作为走线引出区。因所述导电层直接覆盖部分所述走线层，则所述走线层与所述导电层直接接触，使得两者之间的有效接触面积容易控制，有利于稳定两者之间的接触电阻，从而提高所述触控面板的触控效果；而且，暴露的走线层对应所述触控面板的边框区，因为部分所述走线层已被所述导电层覆盖，暴露的走线层作为走线引出区，所以可以相应地减小所述走线引出区的面积，即减小所述触控面板的边框区的尺寸，因此，所述触控面板还可以实现窄边框的设计需求，从而满足显示装置窄边框的市场需求。
进一步的，所述导电层与所述走线层直接接触的有效面积大于或者等于0.25平方毫米，可以实现所述导电层与所述走线层之间良好的电连接，使所述触控面板的信号传输良好，抗干扰能力强。
再进一步的，在所述导电层上形成覆盖层，所述覆盖层能够增加所述导电层与所述基底的粘附力，能够提高所述触控面板的导电性和灵敏性，进一步提高触控面板的触控效果。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (14)

  1. 一种触控面板，包括：
    基底，所述基底具有第一区域和围绕所述第一区域的第二区域；
    走线层，位于所述第二区域上；以及
    导电层，位于所述第一区域上且直接覆盖部分所述走线层，暴露的所述走线层作为所述触控面板的走线引出区。
  2. 如权利要求1所述的触控面板，其中，所述导电层与所述走线层直接接触的有效面积大于或者等于0.25平方毫米。
  3. 如权利要求1所述的触控面板，其中，所述触控面板还包括位于所述导电层上的覆盖层。
  4. 如权利要求3所述的触控面板，其中，所述覆盖层为绝缘胶层。
  5. 如权利要求4所述的触控面板，其中，所述覆盖层的材质包括光学胶。
  6. 如权利要求1所述的触控面板，其中，所述导电层的材质包括纳米金属线，所述走线层的材质包括银线、金线、氧化铟锡、金属筛网或石墨烯中的一种或多种。
  7. 如权利要求3所述的触控面板，其中，所述导电层呈网状；且所述覆盖层在其厚度方向上部分嵌入所述导电层中。
  8. 如权利要求6所述的触控面板，其中，所述导电层为纳米银线层，所述纳米银线层中的纳米银线的线长在10微米至300微米之间，所述纳米银线的线径小于500纳米，且所述线长与所述线径之比大于10。
  9. 如权利要求1所述的触控面板，其中，所述基底为刚性基底或柔性基底。
  10. 一种显示装置，包括如权利要求1所述的触控面板，其中，所述导电层作为所述显示装置的触控电极，所述走线层作为所述触控电极的互连线，所述走线引出区对应所述显示装置的边框区。
  11. 一种触控面板的制作方法，包括：
    提供基底，所述基底具有第一区域和围绕所述第一区域的第二区域；
    形成走线层，所述走线层位于所述第二区域上；以及
    形成导电层，所述导电层位于所述第一区域上且直接覆盖部分所述走线层，暴露的所述走线层作为走线引出区。
  12. 如权利要求11所述的触控面板的制作方法，其中，形成所述走线层的方式包括印刷、溅射或者蒸镀。
  13. 如权利要求11所述的触控面板的制作方法，其中，形成所述导电层的方式包括喷墨、撒播、凹版印刷、凸版印刷、柔印、纳米压印、丝网印刷、刮刀涂布、旋转涂布、针绘、夹缝式涂布或流涂。
  14. 如权利要求11所述的触控面板的制作方法，其中，所述制作方法还包括在所述导电层上形成覆盖层。
PCT/CN2019/071229 2018-06-30 2019-01-10 触控面板及其制作方法、显示装置 Ceased WO2020001002A1 (zh)

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