CN112987984A

CN112987984A - Touch panel

Info

Publication number: CN112987984A
Application number: CN202110280579.1A
Authority: CN
Inventors: 黄松建; 何小娴; 张凡忠
Original assignee: TPK Touch Solutions Xiamen Inc
Current assignee: TPK Touch Solutions Xiamen Inc
Priority date: 2014-09-17
Filing date: 2014-09-17
Publication date: 2021-06-18
Also published as: CN105426025A

Abstract

The invention discloses a touch panel, comprising: the touch control sensing layer comprises a nano silver wire electrode and a corresponding wire routing area, and the wire routing material of the wire routing area is a nano silver wire; the length of the nano silver wire is 20-50 μm, the wire diameter is less than 50nm, and the length-width ratio of the nano silver wire is more than 100; the thickness of the wiring area is the same as that of the nano silver wire electrode; the touch control sensing layer is arranged on the lower surface of the cover plate, the cover plate is provided with a groove, the color coating is embedded into the groove, and the color coating is flush with the surface of the cover plate; the thickness of the color coating is less than 10 μm.

Description

Touch panel

The application is a divisional application with application date of 2014, 9 and 17, application number of 201410474228.4 and invention name of 'a touch panel'.

Technical Field

The present invention relates to the field of touch technologies, and in particular, to a touch panel.

Background

With the rapid rise of the touch panel in the communication industry in recent years, especially the vigorous development in the mobile phone communication industry, the touch panel becomes the first choice of the imaging display device at all.

In the existing touch panel structure, a material of a general electrode layer is Indium Tin Oxide (ITO), a material of a routing is molybdenum aluminum molybdenum (MoAlMo), and when patterns of the electrode layer and the routing layer are manufactured, the patterns can be formed through a plurality of manufacturing processes, so that the yield is generally low, indium in an indium tin oxide material used for a transparent conductive layer is a rare substance, and the content of indium in the indium tin oxide material is about 1.6 ten thousand tons all over the world, so that the price of indium tin oxide is very high; meanwhile, the indium tin oxide has poor flexibility, so that the color of the optional insulating decorative layer is less and can only be dark.

However, people are increasingly demanding on the aesthetic appearance of electronic products, and some people have manufactured a capacitive touch panel (hereinafter referred to as "touch panel") with a colored decorative frame, and a shielding area of the touch panel is made of a colored coating material, so that the touch panel has a diffuse reflection effect on light and has an aesthetic texture. However, when the decorative layer is made into light color such as light color, because the non-black frame is when sheltering from the line, shading effect is not good, when printing the non-black frame, in order to reach the ideal sheltering effect, repeated printing is needed, the decorative frame is made to be very thick, so that the thickness of the frame is increased, and the transparent conducting layer has the problem of climbing.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides a capacitive touch panel with a thin decorative frame and without climbing problems.

In order to solve the above technical problems, the present invention provides a touch panel, including: the touch control sensing layer comprises a nano silver wire electrode and a corresponding wire routing area, and the wire routing material of the wire routing area is a nano silver wire; the length of the nano silver wire is 20-50 μm, the wire diameter is less than 50nm, and the length-width ratio of the nano silver wire is more than 100; the thickness of the wiring area is the same as that of the nano silver wire electrode; the touch control sensing layer is arranged on the lower surface of the cover plate, the cover plate is provided with a groove, the color coating is embedded into the groove, and the color coating is flush with the surface of the cover plate; the thickness of the color coating is less than 10 μm.

Preferably, the color coating comprises color pigments, a binder, a filler, a solvent and an auxiliary agent; wherein the color pigment comprises a metal or metal oxide.

Preferably, the wiring width of the wiring area is 60 μm to 120 μm, and the pitch is 10 μm to 40 μm.

Preferably, the wiring width of the wiring area is 80 μm to 100 μm, and the pitch is 20 μm to 30 μm.

Preferably, the density of the nano-silver wires in the wiring area is greater than that of the nano-silver wires in the nano-silver wire electrode.

Preferably, a protective layer is arranged on the color coating and the visible area of the cover plate.

Preferably, the touch control device further comprises a flexible substrate and an adhesive layer, wherein the touch control sensing layer is formed on the upper surface or the lower surface of the flexible substrate, and the cover plate and the touch control sensing layer are adhered through the adhesive layer.

Preferably, the touch control panel further comprises a second touch control induction layer, wherein the second touch control induction layer comprises a second nano silver wire electrode and a second wire routing area.

Preferably, the second touch sensing layer is located on the lower surface of the cover plate, and the color coating is used for shielding a wiring area of the second touch sensing layer.

Preferably, further comprising: a second flexible substrate; the second touch sensing layer is arranged on any surface of the second flexible substrate; and the second adhesive layer is arranged between the cover plate and the second touch sensing layer.

Compared with the prior art, the touch panel adopts the nano silver wires as the wiring materials, and the nano silver wires have better light transmittance and are easier to shield the wiring, so the color coating can adopt colors on the premise of ensuring the shielding effect, and compared with the prior art that the shielding layer is made into black, the touch panel has obvious improvement on the appearance of the product and bright and rich colors. The silver nanowire is easy to shield when being taken as a wiring, so the thickness of the color coating is thinned, the color coating can be finished by only one printing process, and the thickness can be reduced to be within 10 mu m, thereby the problem of climbing is solved. In addition, the nano silver wire is used as a wiring material, and the silver has better conductivity and lower impedance due to better conductivity. In addition, the color coating can be finished by only one process without repeated processes, so that the thickness of the color coating is greatly reduced (from more than 30 microns to less than 10 microns), the shielding effect is good, the manufacturing cost is saved, the manufacturing speed is accelerated, and the thickness of the touch panel is reduced.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a nano silver wire electrode distributed on a substrate.

Fig. 2 is a schematic plane structure diagram of the nano silver wire electrode distributed on the substrate.

Fig. 3 is a schematic cross-sectional view of a touch panel according to a first embodiment of the invention.

Fig. 4 is a schematic cross-sectional view of a touch panel according to a second embodiment of the invention.

Fig. 5 is a schematic cross-sectional view of a touch panel according to a third embodiment of the invention.

Fig. 6 is a schematic cross-sectional view of a touch panel according to a fourth embodiment of the invention.

Fig. 7 is a schematic structural diagram of a first touch sensing layer of a touch panel according to a fourth embodiment of the invention.

Fig. 8 is a schematic structural diagram of a second touch sensing layer of a touch panel according to a fourth embodiment of the invention.

Fig. 9 is a schematic cross-sectional view of a touch panel according to a fifth embodiment of the invention.

Fig. 10 is a sectional structure diagram of a touch panel according to a fifth embodiment of the present invention.

Fig. 11 is a schematic cross-sectional view of a touch panel according to a sixth embodiment of the invention.

Fig. 12 is a flowchart of a first manufacturing method of a touch panel according to a seventh embodiment of the invention.

FIG. 13 is a flowchart illustrating a second method of fabricating a touch panel according to an eighth embodiment of the present invention.

Detailed Description

To achieve the purpose of the present invention, the technical solutions and advantages will be more clearly understood through the following detailed description of the present invention with reference to the accompanying drawings and the implementation examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be understood that in all embodiments, the upper, lower, left, right, etc. position qualifiers are limited to relative positions on the designated views, not absolute positions.

When the silver is in a nanometer level, the nano silver wire has good light transmittance and excellent conductivity, and can be well applied to a conductive electrode of a touch panel.

Referring to fig. 1 and fig. 2, a silver nanowire electrode 1005 is schematically distributed on a substrate 1007, and the silver nanowire electrode 1005 includes a substrate 1003 and a plurality of silver nanowires 1001 embedded in the substrate 1003. The silver nanowires 1001 have a wire length of 10 μm to 300 μm, preferably 20 μm to 100 μm, most preferably a length of 20 μm to 50 μm, a wire diameter of less than 500nm, or less than 200nm, 100nm, preferably less than 50nm, and an aspect ratio (ratio of wire length to wire diameter) of more than 10, preferably more than 50, more preferably more than 100. The substrate 1007 is typically a transparent insulating material.

The silver nanowires 1001 are interspersed or embedded in a matrix 1003 to form a conductive network. The nano silver wire 1001 forms the nano silver wire electrode 1005 by means of the substrate 1003, and the substrate 1003 can protect the nano silver wire 1001 from being affected by external environments such as corrosion and abrasion.

The matrix 1003 refers to a non-nano silver wire substance which is formed by arranging a nano silver wire solution on the base material 1007 by a coating method and the like, heating and drying the nano silver wire solution to volatilize volatile substances, and then remaining on the base material 1007. The nano silver wire solution refers to a suspension solution in which the nano silver wires 1001 are dispersed in a specific solvent, and the solvent may be water, an aqueous solution, an ionic solution, a salt-containing solution, a supercritical fluid, oil, or a mixture thereof. The solvent may also contain other additives, such as, but not limited to, dispersants, surfactants, cross-linking agents, stabilizers, wetting agents, or thickeners.

The thickness of the nano silver wire electrode 1005 is about 10nm to 5 μm, preferably 20nm to 1 μm, and more preferably 10nm to 200 nm. In some embodiments, the refractive index of the nano-silver wire electrode 1005 is 1.3 to 2.5, and more preferably 1.35 to 1.8.

Referring to fig. 3, the touch panel 10 of the first embodiment of the invention includes a cover 108, a protective layer 105, a color coating 106 and a touch sensing layer 103. The cover plate 108 includes a visible area 1081 located in the middle and a shielding area 1083 located at the peripheral edge, the shielding area 1083 is formed by coating the color coating 106 on the periphery of at least one side of the visible area 1081, the touch sensing layer 103 includes a silver nanowire electrode 1031 and a wiring area 102, the wiring area 102 is formed by a plurality of wires, the material of the wires is silver nanowire 1001, the silver nanowire electrode 1031 corresponds to the visible area 1081 of the cover plate 108, and the wiring area 102 corresponds to the shielding area 1083 of the cover plate 108. The color coating 106 is formed on the upper surface of the shielding region 1083 at the edge of the cover plate 108, the visible region 1081 and the shielding region 1083 are formed on the upper surface of the cover plate 108, the protective layer 105 is formed on the cover plate 108 and the color coating 106, and the color coating 106 is embedded in the protective layer 105. The color coating 106 is disposed along the periphery of at least one side of the visible area 1081, in this embodiment, a conventional structure is adopted in which the color coating 106 is coated on the upper surface of the shielding area 1083 around the cover plate 108, the touch sensing layer 103 is disposed below the cover plate 108, and the periphery thereof is the routing area 102, that is, the routing area 102 is supported by the cover plate 108 and disposed below the shielding area 1083 of the cover plate 108. The width of the color coating 106 corresponds to the width of the routing area 102, and has the function of shielding the routing area 102.

The shielding area 1083 is formed by coating the color coating 106 around the visible area 1081 of the touch panel 10 with a paint commonly used for the touch panel 10. The color coating 106 includes a binder, a pigment, a filler, a solvent and an auxiliary agent, wherein the binder may be a resin selected from any one of epoxy resin, polyurethane resin, alkyd/polyester resin, acrylic resin, amino resin or a combination thereof. The pigment may be selected from organic pigments such as toluidine red, malachite green, fast yellow, etc., or inorganic pigments; the inorganic pigment may be a metal or metal oxide pigment such as, but not limited to, iron red pigment, iron oxide yellow, strontium chromate, chrome green, novelly, or copper powder. The solvent may be selected from water, acetone, ethanol, and the like. The auxiliary agent comprises a wetting agent, a dryer, a defoaming agent, a thickening agent and the like.

The coating method of the color coating 106 includes, but is not limited to, screen printing, gravure printing, offset printing, inkjet printing, gravure printing, spray coating, and sputtering.

The wiring area 102 is formed by a plurality of wirings, the wiring is made of a nano silver wire 1001, the specific microstructure of the wiring is similar to the microstructure of the nano silver wire electrode 1031, the width of the wiring is 60-120 μm, preferably 80-100 μm, more preferably 80 μm, and the distance between adjacent wirings is 10-40 μm, preferably 20-30 μm, more preferably 30 μm. The specific width and the specific pitch are determined according to the size of the touch panel 10, and generally, the larger the size of the touch panel 10 is, the wider the width and the larger the pitch of the nano silver wires 1001 are required.

The wiring region 102 and the silver nanowire electrode 1031 are located on the same touch electrode layer 103, and may be formed by one-step patterning through one process, or the wiring region 102 and the silver nanowire electrode 1031 may be formed by two processes through a conventional ITO touch panel process. In this embodiment, the routing region 102 and the silver nanowire electrode 1031 are formed by one-time patterning through the same process, so that the thicknesses of the routing region 102 and the silver nanowire electrode 1031 are the same, and there is no height difference between the routing region 102 and the silver nanowire electrode 1031, so that the problem of climbing of the silver nanowire electrode 1031 is not generated.

In this embodiment, the color coating 106 is aligned with the cover plate 108, and the width of the color coating is adapted to the width of the wire routing area 102, so that the color coating 106 is mainly used for decoration, so that the product is beautiful and the required color can be realized by selecting different colors of pigments, at this time, the color coating 106 can be coated by printing, and the wires are made of nano silver wires 1001, so that the light transmittance is good and the wires are almost transparent, so that the color coating 106 can be easily shielded, the color coating 106 does not need to be printed repeatedly, and can be completed by only one printing process, and therefore, the color coating 106 is thin and the thickness of the color coating is less than 10 μm.

If the color coating 106 is made of inorganic pigment including metal or metal oxide, the color coating 106 can be applied by sputtering or chemical deposition.

In a modified structure, referring to the touch panel 10 shown in fig. 3, the cover plate 108 may be an 1/4 wave retarder, which helps to alleviate the haze problem caused by light scattering of the nano-silver wires 1001 in the nano-silver wire electrodes 103.

Compared with the prior art, the touch panel 10 of the embodiment adopts the nano silver wire 1001 as the wiring material, and the nano silver wire 1001 has better light transmittance and is easier to shield the wiring, so the color coating 106 can adopt colors on the premise of ensuring the shielding effect, and compared with the prior art that the shielding layer is made into black, the appearance of the product is obviously improved, and the color becomes bright and rich. Since the silver nanowires 1001 are easy to be shielded when they are routed, the thickness of the color coating 106 is reduced, and only one printing process is needed to complete the process, and the thickness can be reduced to within 10 μm, so that it is possible to solve the problem of climbing, and the thickness between the routing area 102 of the touch panel 10 and the silver nanowire electrode 1031 is the same, so that the problem of climbing of the electrode does not exist. In addition, the nano silver wire 1001 is used as a wiring material, and the silver has good conductivity and low impedance. In addition, the color coating 106 can be completed by only one printing process without repeated printing, so that the thickness of the color coating 106 is greatly reduced (from more than 30 μm to less than 10 μm), the shielding effect is good, the manufacturing cost is saved, the manufacturing speed is accelerated, and the thickness of the touch panel 10 is reduced.

Referring to fig. 4, a touch panel 20 according to a second embodiment of the present invention includes a cover plate 208, which includes a visible area 2081 and a shielding area 2083, a color coating 206 and a touch sensing layer 203, where the shielding area 2083 is formed by coating the color coating 206 on at least one side of the visible area 2081, the touch sensing layer 203 includes a nano-silver wire electrode 2031, an insulating layer 204 and a routing area 202, the nano-silver wire electrode 2031 is directly formed on the lower surface of the visible area 2081 of the cover plate 208, the periphery of the nano-silver wire electrode is closely adjacent to the routing area 202, the routing area 202 is provided with the insulating layer 204, the insulating layer 204 is provided with the color coating 206, that is, the insulating layer 204 is provided between the routing area 202 and the color coating 206, and the color coating 206 is located on the lower surface of the. This embodiment is particularly suitable for the insulating layer 204 to isolate the color coating 206 from the routing area 202 when the color coating 206 contains a conductive material such as metal or metal oxide. If the color coating 206 uses an insulating material, the insulating layer 204 can be omitted, so that the product is thinner and lighter. The thickness of the color coating 206 can be set within 10 μm, and can be completed by one process.

In another embodiment, the lower surface of the color coating 206 is horizontally level with the lower surface of the viewing area 2081 of the cover plate 208. The colored coating 206 can be formed by grooving the cover plate 208 and filling the grooves with a colored coating.

In another embodiment, the lower surface of the colored coating 206 is not level with the lower surface of the viewing area 2081 of the cover plate 208 in the horizontal direction, and the colored coating 206 protrudes from the lower surface of the cover plate 208. The wiring region 202 and the nano-silver wire electrode 203 are completed by two processes respectively. The density of the nano silver wires 1001 in the wiring area 202 can be made greater than that of the nano silver wires 1001 in the nano silver wire electrode 203 by adjusting the concentration of the nano silver wire solution, so as to improve the conductivity of the wiring. The thickness of the routing area 202 is smaller than that of the nano-silver wire electrode 203, and the total thickness of the part of the color coating 206 protruding from the surface of the cover plate 208 and the insulating layer 204 is smaller than that of the nano-silver wire electrode 203.

Because the nano silver wire electrode 203 is at least partially in electrical contact with the wiring layer 202 in the thickness direction, the problem of climbing is avoided.

Referring to fig. 5, a touch panel 30 according to a third embodiment of the present invention includes a cover plate 308 including a visible area 3081 and a shielding area 3083, a color coating 306, an adhesive layer 307, a touch sensing layer 303, and a flexible substrate 301, the shielding area 3083 is formed by coating the color coating 306 on at least one side of the visible area 3081 of the cover plate 308, the touch sensing layer 303 includes a silver nanowire electrode 3031 and a corresponding routing area 302 thereof, the silver nanowire electrode 3031 and the corresponding routing area 302 thereof respectively correspond to the visible area 3081 and the shielding area 3083 of the cover plate 308, the silver nanowire electrode 3031 is formed on the upper surface of the flexible substrate 301, the wiring area 302 is arranged on the periphery of the flexible substrate 301, the bonding layer 307 is arranged above the touch sensing layer 303, the cover plate 308 is arranged on the bonding layer 307, and the color coating 306 arranged on the lower surface of the shielding area 3083 of the cover plate 308 can just shield the wiring area 302 below.

The material of the adhesive layer 307 is selected from transparent adhesives such as transparent optical adhesive, pressure-sensitive adhesive, UV adhesive and the like.

In other embodiments, the touch sensing layer 303 may be disposed on the lower surface of the flexible substrate 301, and the color coating 306 may be disposed on the upper surface of the cover plate 308. The thickness of the color coating 306 can be set within 10 μm, and can be completed by one process.

Referring to fig. 6, a touch panel 40 according to a fourth embodiment of the invention includes a cover 408 including a visible region 4081 and a shielding region 4083, a color coating 406, an adhesive layer 407, a first touch sensing layer 413, a second touch sensing layer 423, and a flexible substrate 401. The shielding region 4083 is formed by coating a color coating 406 on at least one side of the visible region 4081 of the cover 408, the first touch sensing layer 413 includes a first nano silver wire electrode 4131 and a corresponding first routing region 4021, the second touch sensing layer 423 includes a second nano silver wire electrode 4231 and a corresponding second routing region 4023, the first nano silver wire electrode 4131 and the second nano silver wire electrode 4231 correspond to the visible region 4081 of the cover 408, the first routing region 4021 and the second routing region 4023 correspond to the shielding region 4083 of the cover 408, the flexible substrate 401 includes an upper surface and a lower surface, the first touch sensing layer 413 is formed on the lower surface of the flexible substrate 401, the second touch sensing layer 423 is formed on the upper surface of the flexible substrate 401, and the first nano silver wire electrode 4131 and the second nano silver wire electrode 4231 form capacitance sensing with each other to realize a touch function.

Similar to the first embodiment, the peripheries of the same layer of the first silver nanowire electrode 4131 and the second silver nanowire electrode 4231 are provided with wiring areas (not numbered) in close proximity, and the wiring areas adopt the silver nanowires 1001 as wiring materials. The lower surface of the shielding region 4083 of the cover 408 just shields the wiring region through the formed color coating 406, and the thickness of the color coating 406 can be set within 10 μm, so that the wiring made of the silver nanowires 1001 can be shielded by one process.

The flexible substrate 401 is generally square, the material is selected from any one of PEEK (polyether ether ketone), PI (polyimide), PET (polyethylene terephthalate), PC (polycarbonate), PES (polyethylene succinate), PMMA (polymethyl methacrylate), or a composite of any two thereof, and a plurality of through holes 411 are formed on the flexible substrate 401, the through holes 411 are filled with a conductive material or a metal plating layer is formed in the through holes for connecting with corresponding traces, the conductive material can be conductive silver paste, copper paste or other conductive metal pastes, the diameter Φ of the through holes 411 is 20 μm to 1mm, preferably 200 μm to 600 μm.

With reference to fig. 7, the first nano-silver wire electrode 4131 includes a plurality of first conductive electrodes 4002 arranged in parallel and at equal intervals in a first direction (X direction), and the first routing region 4021 includes a plurality of first routings 4022. The plurality of first wires 4022 respectively correspond to the plurality of first conductive electrodes 4002 arranged at intervals and the plurality of through holes 411 one by one, one end of each first wire is electrically connected to the corresponding first conductive electrode 4002, and the other end of each first wire extends to the position of the corresponding through hole 411.

Referring to fig. 8, the second nano-silver wire electrode 4231 includes a plurality of second conductive electrodes 4004 arranged in parallel and at equal intervals in a second direction (Y direction), and the second wire area 4023 includes a plurality of second wires 4024 and a plurality of connection wires 4025. The second wires 4024 are respectively in one-to-one correspondence with the second conductive electrodes 4004 arranged at intervals, one end of each second wire is electrically connected to the corresponding second conductive electrode 4004, and the other end of each second wire extends to a connection region 4027 on one side of the second silver nanowire electrode 4231 and is respectively connected to a corresponding connection terminal (not labeled) thereon for connecting a flexible circuit board (not shown). The connecting wires 4025 have one end connected to the corresponding through holes 411 and the other end extending to the connecting region 4027, and are also used for connecting the flexible circuit board.

Compared with the prior art, the capacitive touch panel 40 of this embodiment adopts the through hole design, so that the first trace 4022 is connected to the connection line 4025 through the through hole 411 and led to the connection region 4027, and thus the assembly can be completed only by using one flexible circuit board and the connection region 4027 through one-time pressing (bonding) process.

Referring to fig. 9, a touch panel 50 according to a fifth embodiment of the present invention includes a cover 508, a color coating 506, a first touch sensing layer 513, a second touch sensing layer 523, an adhesive layer 507, a first flexible substrate 5011 and a second flexible substrate 5013, wherein the cover 508 includes a visible region 5081 and a shielded region 5083, the color coating 506 is disposed on a lower surface of the shielded region 5083 of the cover 508, so that the cover 508 forms the visible region 5081 and the shielded region 5083, the first touch sensing layer 513 includes a first nano-silver wire electrode 5131 and a corresponding first wire routing region 5021, and the first nano-silver wire electrode 5131 is formed on an upper surface of the first flexible substrate 5011; the second touch sensing layer 523 includes a second nano-silver wire electrode 5231 and a corresponding second wire routing region 5023, which are formed on the upper surface of the second flexible substrate 5013, and similar to the previous embodiments, the first nano-silver wire electrode 5131 and the second nano-silver wire electrode 5231 correspond to the visible region 5081 of the cover 508, and the first wire routing region 5021 and the second wire routing region 5023 correspond to the shielding region 5083 of the cover 508. The adhesive layer 507 includes a first adhesive layer 5071 and a second adhesive layer 5073, the first adhesive layer 5071 adheres to the second flexible substrate 5013 and the first touch sensing layer 513, the second adhesive layer 5073 adheres to the cover plate 508 and the second touch sensing layer 523, the first routing area 5021 and the second routing area 5023 have a structure similar to that of the routing area of the first embodiment, and are formed by the same process as the corresponding silver nanowire electrodes, and have the same thickness, the color coating 506 is formed on the lower surface of the shielding area 5083 of the cover plate 508, and just shields the first routing area 5021 and the second routing area 5023, thereby achieving a good shielding effect.

In other embodiments, the structures of the first routing region 5021 and/or the second routing region 5023 and the corresponding nano-silver wire electrodes are completed by two processes. The density of the nano silver wires in the wire routing area can be made to be larger than that of the nano silver wires in the nano silver wire electrode by adjusting the concentration of the nano silver wire solution, so that the electric conductivity of the wires is improved.

In other embodiments, the first touch sensing layer 513 may be formed on the lower surface of the first flexible substrate 5011, and the second touch sensing layer 523 may also be formed on the lower surface of the second flexible substrate 5013. The color coating 506 is disposed on either of the upper and lower surfaces of the cover 508.

Referring to fig. 10, in another embodiment, the structure of the second touch sensing layer 523 is similar to that of the second touch sensing layer, and includes a second nano-silver wire electrode 5231, a second wire routing region 5023 and an insulating layer 504, and a color coating 506 is formed on the insulating layer 504 to shield the first wire routing region 5021 and the second wire routing region 5023. The second adhesive layer 5073 adheres the second touch sensing layer 523 and the cover plate 508. It should be understood that either or both of the first touch sensing layer 513 and the second touch sensing layer 523 may be configured as described above.

Referring to fig. 11, a touch panel 60 according to a sixth embodiment of the present invention includes a cover 608, a first touch sensing layer 613, a second touch sensing layer 623, a color coating 606, an adhesive layer 607, and a flexible substrate 601. The cover plate 608 includes a visible area 6081 and a shielding area 6083, the shielding area 6083 is formed by coating a color coating 606 on at least one periphery of the visible area 6081 of the cover plate 608, the first touch sensing layer 613 is formed on the upper surface of the flexible substrate 601, the adhesive layer 607 includes a first adhesive layer 6071 and a second adhesive layer 6073, the second touch sensing layer 623 is located above the first adhesive layer 6071 and adhered to the first touch sensing layer 613 through the first adhesive layer 6071, and the second adhesive layer 6073 is located above the second touch sensing layer 623 and adheres to the second touch sensing layer 623, the cover plate 608 and the color coating 606.

The first touch sensing layer 613 and the second touch sensing layer 623 have similar structures to those of the touch sensing layer of the previous embodiment, and both include corresponding nano-silver wire electrodes and routing areas, which respectively correspond to the visible area 6081 and the shielding area 6083 of the cover plate 608, and the nano-silver wire electrodes and the routing areas are formed by one-step patterning in the same process, and the thickness of the color coating is less than 10 μm.

In a variation of this embodiment, the second adhesive layer 6073 may be omitted, and the second touch sensing layer 623 may be directly formed on the lower surface of the cover 608, and the cover 608 may be adhered to the flexible substrate 601 and the first touch sensing layer 613 through the adhesive layer 607.

Similar to the fifth embodiment, in this embodiment, any one of the structures of the first touch sensing layer 613 and the second touch sensing layer 623 may be similar to the structure of the touch sensing layer of the second embodiment, or both may be similar to the structure of the touch sensing layer of the second embodiment.

Referring to fig. 12, which is a flowchart of a manufacturing method of a touch panel according to a seventh embodiment of the present invention, taking the touch panel 10 as an example, the method includes the following steps:

s11: providing a cover plate 108;

s12: coating a layer of nano silver wire 1001 on the lower surface of the cover plate 108;

s13: patterning nano silver wire electrodes 103 and a wire routing area 102;

s14: the color coating 106 is formed on the upper surface of the cover plate 108 along the periphery; and

s15: a protective layer 105 is provided over the cover plate 108 and the color coating 106.

In step S11, the cover plate 108 may be any one of glass, tempered glass, sapphire glass, or flexible transparent substrate such as PEEK (polyetheretherketone), PI (polyimide), PET (polyethylene terephthalate), PC (polycarbonate), PES (polyethylene succinate), PMMA (polymethyl methacrylate), or a composite of any two thereof.

In step S12, the nano-silver wire 1001 is coated in the form of a nano-silver wire solution. Methods of coating include, but are not limited to: inkjet, broadcast, gravure, letterpress, flexography, nanoimprint, screen printing, Meyer rod, knife coating, spin coating, pin drawing, slot coating, or flow coating.

In step S13, the silver nanowire electrode 103 and the routing area 102 are patterned at a time by a single process to ensure that the thickness of the two is the same.

The material of the wiring area 102 is a nano silver wire 1001, the wiring width of the wiring area 102 is 60 μm to 120 μm, preferably 80 μm to 100 μm, and the distance between adjacent wirings is 10 μm to 40 μm, preferably 20 μm to 30 μm. The specific width and the specific pitch are determined according to the size of the touch panel 10, and generally, the larger the size of the touch panel 10 is, the wider the width and the larger the pitch of the nano silver wires 1001 are required.

The patterning method can be as follows:

wet etching: comprises the steps of exposure, development, film stripping and the like;

oxidizing and etching: shielding the expected conductive area, and placing the conductive area in a moisture oxygen-rich and H2S environment to oxidize the nano silver wires in the non-conductive area into non-conductive metal oxide;

laser etching, namely, laser is adopted to remove the nano silver wires in the non-conductive area to form the non-conductive area; or

And (3) arc high-frequency induction etching, wherein the high-frequency arc is adopted to bombard the nano silver wire in the non-conductive area, so that the silver wire is gasified to form the non-conductive area.

In step S14, the color coating 106 includes a binder, a pigment, a filler, a solvent, and an auxiliary agent. Wherein the base material can be resin, and is selected from any one or combination of epoxy resin, polyurethane resin, alkyd/polyester resin, acrylic resin and amino resin. The pigment may be selected from organic pigments such as toluidine red, malachite green, fast yellow, etc., or inorganic pigments; the inorganic pigment may be a metal or metal oxide pigment, such as, but not limited to, iron red pigment, iron oxide yellow, strontium chromate, chrome green, emerald, copper powder, and the like. The solvent may be selected from water, acetone, ethanol, and the like. The auxiliary agent comprises a wetting agent, a dryer, a defoaming agent, a thickening agent and the like.

Because the routing adopts the nano silver wire 1001, the light transmittance is better, the routing is almost transparent, and the color coating 106 can be easily shielded, so that the color coating 106 can be completed only by one printing process without repeated printing, and the thickness is thinner and less than 10 μm.

The method for applying the color coating 106 includes, but is not limited to, screen printing, gravure printing, offset printing, inkjet printing, gravure printing, spray coating, sputtering, and the like.

Referring to fig. 13, which is a flowchart of a second manufacturing method of a touch panel according to an eighth embodiment of the present invention, taking the touch panel 30 of the third embodiment as an example, the method includes the following steps:

s21: providing a flexible substrate 301;

s22: forming a nano silver wire electrode 303 and a wiring area 302 on the upper surface of the flexible substrate 301;

s23: coating a color coating on the lower surface of the cover plate 308 to form a color coating 306; and

s24: the cover plate 308 in S23 is bonded to the flexible substrate 301 in S22 by an adhesive layer 307.

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 of the present invention are intended to be included within the scope of the present invention.

Claims

1. A touch panel, comprising:

the touch control sensing layer comprises a nano silver wire electrode and a corresponding wire routing area, and the wire routing material of the wire routing area is a nano silver wire; the length of the nano silver wire is 20-50 μm, the wire diameter is less than 50nm, and the length-width ratio of the nano silver wire is more than 100; the thickness of the wiring area is the same as that of the nano silver wire electrode;

the touch control sensing layer is arranged on the lower surface of the cover plate, the cover plate is provided with a groove, the color coating is embedded into the groove, and the color coating is flush with the surface of the cover plate; the thickness of the color coating is less than 10 μm.

2. The touch panel of claim 1, wherein: the color coating comprises color pigment, base material, filler, solvent and auxiliary agent; wherein the color pigment comprises a metal or metal oxide.

3. The touch panel of claim 1, wherein: the wiring width of the wiring area is 60-120 mu m, and the distance is 10-40 mu m.

4. The touch panel of claim 1, wherein: the wiring width of the wiring area is 80-100 μm, and the distance is 20-30 μm.

5. The touch panel of claim 1, wherein: the density of the nano silver wires in the wiring area is greater than that of the nano silver wires in the nano silver wire electrode.

6. The touch panel of claim 5, wherein: and a protective layer is arranged on the color coating and the visible area of the cover plate.

7. The touch panel of claim 1, wherein: the touch control induction layer is formed on the upper surface or the lower surface of the flexible substrate, and the cover plate is adhered to the touch control induction layer through the bonding layer.

8. The touch panel of claim 7, wherein: the touch control panel further comprises a second touch control induction layer, wherein the second touch control induction layer comprises a second nano silver wire electrode and a second wire area.

9. The touch panel of claim 7, wherein: the second touch sensing layer is located on the lower surface of the cover plate, and the color coating is used for shielding a second wiring area of the second touch sensing layer.

10. The touch panel of claim 8, further comprising: a second flexible substrate; the second touch sensing layer is arranged on any surface of the second flexible substrate; and the second adhesive layer is arranged between the cover plate and the second touch sensing layer.