CN107390938B - Touch screen and manufacturing method thereof - Google Patents

Abstract

The invention relates to a touch screen and a manufacturing method thereof. The touch screen comprises a substrate, a first electrode, a first peripheral wire, an insulating layer, a second electrode and a second peripheral wire, the touch screen is further divided into a touch area, a first peripheral area and a second peripheral area, the first electrode comprises a first main body part positioned in the touch area and a first contact pad positioned in the first peripheral area, the first peripheral wire is arranged on the substrate and comprises a first connecting pad, a second connecting pad and a first wire part which are connected with the first contact pad, the second peripheral wire is arranged on the substrate and positioned in the second peripheral area, the second peripheral wire comprises a third connecting pad, a fourth connecting pad and a second wire part, the insulating layer corresponds to the touch area and the first peripheral area and is arranged on the substrate, the first electrode, the first connecting pad and at least part of the first wire part, the second electrode is arranged on the insulating layer and is overlapped with the first electrode in an insulating way, the second electrode is also connected with a third connecting pad.

Description

Touch screen and manufacturing method thereof

Technical Field

The invention relates to a touch screen and a manufacturing method thereof.

Background

Currently, touch screens are widely used in display devices of various electronic products to facilitate users to control the operation of the electronic products by touch. Touch panels generally include a first electrode extending along a first direction and a second electrode extending along a second direction and overlapping the first electrode in an insulating manner.

In a Single-layer conductive layer (Single ITO, also called SITO) structured touch screen, the first electrode and the second electrode are disposed on the same layer, but are insulated at the intersection by an insulating layer, wherein two portions of the second electrode located at two sides of the first electrode may be connected by an insulating layer through hole or overlapped by a metal bridge, however, both the insulating layer through hole connection and the metal bridge overlapping are required to be subjected to two-side alignment exposure (such as one-time alignment exposure for forming an insulating layer and one-time alignment exposure for forming a metal bridge), which results in a large cumulative tolerance of two exposures, thereby easily causing poor connection of the two portions of the second electrode and reducing yield of the touch screen. Furthermore, the substrate of the touch screen may shrink in the thermal curing process of the insulating layer, and then the yellow light alignment is difficult to occur in the exposure process of the through hole or the metal bridge of the subsequent insulating layer, which is more likely to cause the problems of poor lap joint precision, low yield and the like.

Disclosure of Invention

Accordingly, there is a need for a touch panel and a method for manufacturing the same that can improve the poor connection and yield problems.

A touch screen comprises a substrate, a first electrode, a first peripheral trace, an insulating layer, a second electrode and a second peripheral trace, wherein the touch screen is further divided into a touch area, a first peripheral area positioned on a first side of the touch area, and a second peripheral area positioned on a second side of the touch area and adjacent to the first peripheral area, the second peripheral area comprises a binding area, the first electrode is arranged on the substrate and extends along a first direction, the first electrode comprises a first main body part positioned in the touch area and a first contact pad connected with one end of the first main body part and positioned in the first peripheral area, the first peripheral trace is arranged on the substrate, the first peripheral trace comprises a first connecting pad connected with the first contact pad, a second connecting pad positioned in the binding area and a first trace part connected between the first connecting pad and the second connecting pad, the second peripheral trace is disposed on the substrate and located in the second peripheral area, the second peripheral trace includes a third connecting pad, a fourth connecting pad located in the bonding area, and a second trace portion connected between the third connecting pad and the fourth connecting pad, the insulating layer corresponds to the touch area and the first peripheral area and is arranged on the first electrode, the first connecting pad and at least part of the first routing part, the second electrode is disposed on the insulating layer and extends in a second direction different from the first direction to overlap the first electrode in an insulating manner, the second electrode comprises a second main body part positioned in the touch area and a second contact pad connected with one end of the second main body part and positioned in the second peripheral area, the second contact pad of the second electrode is connected to the third connection pad of the second peripheral trace.

In one embodiment, the insulating layer does not overlap with a projection of the second peripheral area in a direction perpendicular to the touch screen.

In an embodiment, the second peripheral region further includes a contact region disposed on the second connection pad, the insulating layer includes a first opening corresponding to the bonding region and a second opening corresponding to the contact region, and the insulating layer is further disposed on the substrate, the first routing portion, and the second routing portion of the second peripheral region.

In an embodiment, the number of the first peripheral regions is two, the two first peripheral regions are located at two opposite sides of the touch region, and the insulating layer corresponds to the two first peripheral regions and is disposed on the first connecting pads and at least a portion of the first routing portions of the two first peripheral regions.

In one embodiment, each of the first and second routing portions includes a transparent conductive layer and a metal layer stacked on the transparent conductive layer.

In one embodiment, the transparent conductive layer is made of the same material as the first electrode and is formed in the same mask process.

In one embodiment, the thickness of the insulating layer is less than or equal to 10 um.

In one embodiment, the insulating layer includes a bottom surface adjacent to the substrate and a side surface connecting the bottom surface, and an inclination angle between the bottom surface and the side surface is less than 90 degrees.

In one embodiment, the first main body portion includes a plurality of first electrode portions arranged in the first direction and a first connection bridge connected between two adjacent first electrode portions, the second main body portion includes a plurality of second electrode portions arranged in the second direction and a second connection bridge connected between two adjacent second electrode portions, the first electrode portions and the second electrode portions do not overlap in a direction perpendicular to the touch screen, and the first connection bridge and the second connection bridge intersect in an insulating manner in the direction perpendicular to the touch screen.

In one embodiment, the process exposure alignment accuracy of the first electrode and the second electrode is K, K is less than or equal to 100um, the distances between the first electrode portion and two adjacent second electrode portions are a and b, respectively, and 0 ≦ a-b ≦ 2K.

The manufacturing method of the touch screen comprises the following steps:

providing the substrate;

forming the first electrode and the transparent conductive layer on the substrate, and forming the metal layer on the transparent conductive layer and the first contact pad of the first electrode;

forming the insulating layer on the first electrode and the metal layer, wherein the insulating layer and the third connecting pad are at least partially not overlapped along a direction vertical to the touch screen; and

and forming the second electrode on the insulating layer and the third connecting pad, wherein the second contact pad of the second electrode is lapped with the third connecting pad.

Compared with the prior art, in the touch screen and the manufacturing method thereof, the first electrode and the second electrode are arranged on different layers, the insulating layer corresponds to the touch area and the first peripheral area and is arranged on the first electrode, the first connecting pad and at least part of the first wire part, and the second electrode is arranged on the insulating layer and the third connecting pad, so that the insulating layer does not need to be provided with a via hole in the touch area and an additional metal bridge is not needed to be arranged on the second electrode, and the problems of poor lap joint, low yield and the like caused by the via hole and the metal bridge are not easy to occur.

Drawings

Fig. 1 is a schematic plan view of a touch panel according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view along line II-II of fig. 1.

Fig. 3 is a schematic cross-sectional view along the line III-III in fig. 1.

Fig. 4 is a schematic plan view of a touch panel according to a second embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view along the line V-V in fig. 4.

Fig. 6 is a schematic cross-sectional view along line VI-VI of fig. 1.

FIG. 7 is a flow chart of a method of manufacturing a touch screen of the present invention.

Description of the main elements

Touch screens 10, 20

Base plate 11, 21

First electrode 12, 22

First peripheral wirings 13, 23

Second peripheral trace 14, 24

Insulating layers 15, 25

Second electrodes 16, 26

Touch areas 10a, 20a

First peripheral regions 10b, 20b

Second peripheral regions 10c, 20c

Binding regions 10d, 20d

Contact areas 10e, 20e

First body parts 121, 221

First contact pads 122, 222

First electrode portions 123, 223

First connecting bridge 124, 224

First connection pads 131, 231

Second connecting pad 132, 232

First routing parts 133, 233

Third connecting pads 141, 241

Fourth connecting pads 142, 242

Second routing portions 143, 243

Transparent conductive layers 134, 234

Metal layers 135, 235

Bottom 151, 251

Side 152, 252

Second body portions 161, 261

Second contact pads 162, 262

Second electrode portions 163, 263

Second connecting bridges 164, 264

First direction X

Second direction Y

First opening 253

Second opening 254

Steps S1-S4

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Referring to fig. 1, 2 and 3, fig. 1 is a schematic plan view of a touch screen 10 according to a first embodiment of the invention, fig. 2 is a schematic cross-sectional view taken along line II-II of fig. 1, and fig. 3 is a schematic cross-sectional view taken along line III-III of fig. 1. The touch screen 10 includes a substrate 11, a first electrode 12, a first peripheral trace 13, a second peripheral trace 14, an insulating layer 15, and a second electrode 16.

The touch screen 10 is further divided into a touch area 10a, a first peripheral area 10b located at a first side of the touch area 10a, and a second peripheral area 10c located at a second side of the touch area 10a and adjacent to the first peripheral area 10 b. In this embodiment, the number of the first peripheral areas 10b is two, the two first peripheral areas 10b are located at two opposite sides of the touch area 10a, and the second peripheral area 10c is connected to the same side of the touch area 10a and the first peripheral area 10 b. Specifically, the second peripheral area 10b includes a bonding area 10d and a contact area 10e, the bonding area 10d is used for electrically connecting an external circuit (for example, connecting the external circuit via a flexible circuit board), and the contact area 10e is used for overlapping the second electrode 16 and the second peripheral trace 14.

The substrate 11 may be a transparent substrate, and the material thereof may be one of glass, sapphire, transparent resin (such as PET material), and transparent ceramic, but is not limited to the above materials.

The first electrode 12 is disposed on the substrate 11 and extends along a first direction X, and the first electrode 12 includes a first main body portion 121 located in the touch region 10a and a first contact pad 122 connected to one end of the first main body portion 121 and located in the first peripheral region 10 b. The first body portion 121 includes a plurality of first electrode portions 123 arranged along the first direction X and a first connecting bridge 124 connected between two adjacent first electrode portions 123. The shape of the first electrode portion 123 may be, but is not limited to, a diamond shape, a circular shape, and the like. The first connection bridge 124 may have a straight bar shape, and a width thereof is smaller than that of the first electrode part 123. The material of the first electrode 12 may be a transparent conductive material, such as Indium Tin Oxide (ITO). It is understood that the number of the first electrodes 12 may be multiple, the multiple first electrodes 12 are disposed at intervals and all extend along the first direction X, and the distances between any two adjacent first electrodes 12 may be equal.

The first peripheral trace 13 is disposed on the substrate 11 and is used for connecting a corresponding first electrode 12. The number of the first peripheral traces 13 may be the same as the number of the first electrodes 12, so that each first electrode 12 is connected to a corresponding first peripheral trace 13. Specifically, the first peripheral trace 13 includes a first connecting pad 131 connected to the first contact pad 122 and located in the first peripheral region 10b, a second connecting pad 132 located in the bonding region 10d, and a first trace portion 133 connected between the first connecting pad 131 and the second connecting pad 132. It is understood that a portion of the first wire-routing portion 133 is located in the first peripheral region 10b, and another portion is located in the second peripheral region 10 c.

The second peripheral trace 14 is disposed on the substrate 11 and located in the second peripheral region 10c, and is used for connecting a corresponding second electrode 16. The number of the second peripheral traces 14 may be the same as the number of the second electrodes 16, so that each second electrode 16 is connected to a corresponding second peripheral trace 14. Specifically, the second peripheral trace 14 includes a third connecting pad 141 located in the contact area 10e, a fourth connecting pad 142 located in the bonding area 10d, and a second trace 143 connected between the third connecting pad 141 and the fourth connecting pad 142.

Each of the first and second wire portions 133 and 143 includes a transparent conductive layer 134 and a metal layer 135 stacked on the transparent conductive layer 134. The transparent conductive layer 134 is made of the same material as the first electrode 12 (e.g., both ito materials) and can be formed in the same mask process. Specifically, the transparent conductive layer 134 may be located between the substrate 11 and the metal layer 14. The material of the metal layer 135 may be an opaque metal material, such as a metal material with low impedance, including silver, copper, aluminum, and the like.

The insulating layer 15 corresponds to the touch area 10a and the first peripheral area 10b and is disposed on the first electrode 12, the first connection pad 131, at least a portion of the first routing portion 133 and the substrate 11, and specifically, the insulating layer 15 may completely cover the touch area 10a and the first peripheral area 10b and cover the first electrode 12, the first connection pad 131 of the first peripheral area 10b and a portion of the first routing portion 133. In this embodiment, the projections of the insulating layer 15 and the second peripheral area 10c along the direction perpendicular to the touch screen 10 do not overlap, for example, they may just meet or have a predetermined interval, so that the second peripheral traces 14 may be exposed outside the insulating layer 15.

The touch screen 10 may include two first peripheral areas 10b located at opposite sides of the touch area 10a, and the insulating layer 15 completely covers the first electrodes 12 of the touch area 10a and the two first peripheral areas 10b, the first connection pads 131 of the first peripheral areas 10b, and a portion of the first routing portions 133. Further, the size of the insulating layer 15 may be substantially equal to the size of the substrate 11, or slightly smaller than the size of the substrate 11. The insulating layer 15 may include a bottom surface 151 adjacent to the substrate 11 and a side surface 152 connected to the bottom surface 151, and an inclination angle between the bottom surface 151 and the side surface 152 is less than 90 degrees. The thickness of the insulating layer 15 is less than or equal to 10 um. The material of the insulating layer 15 is a transparent insulating material, such as Optical Cement (OC), or thermoplastic elastomer (TPF), etc.

The second electrode 16 is disposed on the insulating layer 15 and the substrate 11 and extends along a second direction Y different from the first direction X to be overlapped with the first electrode 12 in an insulating manner, the second electrode 16 includes a second main body portion 161 and a second contact pad 162, the second main body portion 161 corresponds to the touch region 10a and is located on the insulating layer 15, the second contact pad 162 is connected to one end of the second main body portion 161 and is located on the substrate of the second peripheral region 10b, and one end of the second contact pad 162 connected to the second main body portion 161 on the insulating layer 15 is connected to the second main body portion 161 on the insulating layer 15 through the side surface 152 of the insulating layer 15. The second contact pad 162 further extends to the contact area 10e to connect with the third connection pad 141, so that the second electrode 16 is connected to the second peripheral trace 14, in this embodiment, the second contact pad 162 of the second electrode 16 is overlapped with the third connection pad 141 of the second peripheral trace 14 to be electrically connected. Wherein the first direction X and the second direction Y may be perpendicular.

The second body 161 includes a plurality of second electrode portions 163 arranged along the second direction Y and a second connecting bridge 164 connected between two adjacent second electrode portions 163, the first electrode portions 123 and the second electrode portions 163 do not overlap in a direction perpendicular to the touch screen 10, and the first connecting bridge 124 and the second connecting bridge 164 intersect in an insulating manner in the direction perpendicular to the touch screen 10. The shape of the second electrode portion 163 may be a diamond shape, a circular shape, and the like, but is not limited to the above. The second connection bridge 164 may have a straight bar shape having a width smaller than that of the second electrode part 163. The material of the second electrode 16 may be a transparent conductive material, such as Indium Tin Oxide (ITO). It is understood that the number of the second electrodes 16 may be multiple, the multiple second electrodes 16 are disposed at intervals, and all extend along the second direction Y and intersect with the multiple first electrodes 12 at the first connecting bridge 124 and the second connecting bridge 164 in an insulating manner, and the distances between any two adjacent second electrodes 16 may be equal.

Further, in this embodiment, assuming that the process exposure alignment accuracy of the first electrode 12 and the second electrode 16 is K, K is less than or equal to 100um, and the distances between the first electrode portion 123 and two adjacent second electrode portions 163 are a and b, respectively, where 0 ≦ a-b ≦ 2K.

Referring to fig. 4, 5 and 6, fig. 4 is a schematic plan view of a touch screen 20 according to a second embodiment of the present invention, fig. 5 is a schematic cross-sectional view taken along line V-V of fig. 4, and fig. 6 is a schematic cross-sectional view taken along line VI-VI of fig. 1. The touch screen 20 includes a substrate 21, a first electrode 22, a first peripheral trace 23, an insulating layer 25, a second electrode 26, and a second peripheral trace 24.

The touch screen 20 is further divided into a touch area 20a, a first peripheral area 20b located at a first side of the touch area 20a, and a second peripheral area 20c located at a second side of the touch area 20a and adjacent to the first peripheral area 20 b. In this embodiment, the number of the first peripheral areas 20b is two, the two first peripheral areas 20b are located at two opposite sides of the touch area 20a, and the second peripheral area 20c is connected to the same side of the touch area 20a and the first peripheral area 20 b. Specifically, the second peripheral area 20a includes a bonding area 20d and a contact area 20e, the bonding area 20d is used for electrically connecting an external circuit (for example, connecting the external circuit via a flexible circuit board), and the contact area 20e is used for overlapping the second electrode 16 and the second peripheral trace 14.

The substrate 21 may be a transparent substrate, and the material thereof may be one of glass, sapphire, transparent resin (such as PET material), and transparent ceramic, but is not limited to the above materials.

The first electrode 22 is disposed on the substrate 21 and extends along a first direction X, and the first electrode 22 includes a first main body portion 221 located in the touch region 20a and a first contact pad 222 connected to one end of the first main body portion 221 and located in the first peripheral region 20 b. The first body portion 221 includes a plurality of first electrode portions 223 arranged along the first direction X and a first connection bridge 224 connected between two adjacent first electrode portions 223. The shape of the first electrode portion 223 may be a diamond shape, a circular shape, and the like, but is not limited to the above. The first connection bridge 224 may have a straight bar shape having a width smaller than that of the first electrode portion 223. The material of the first electrode 22 may be a transparent conductive material, such as Indium Tin Oxide (ITO). It is understood that the number of the first electrodes 22 may be multiple, the multiple first electrodes 22 are disposed at intervals and all extend along the first direction X, and the distances between any two adjacent first electrodes 22 may be equal.

The first peripheral trace 23 is disposed on the substrate 21 and is used for connecting a corresponding first electrode 22. The number of the first peripheral traces 23 may be the same as the number of the first electrodes 22, so that each first electrode 22 is connected to a corresponding first peripheral trace 23. Specifically, the first peripheral trace 23 includes a first connecting pad connected to the first contact pad 222 and located in the first peripheral region 20b, a second connecting pad 232 located in the bonding region 20d, and a first trace portion 233 connected between the first connecting pad 231 and the second connecting pad 232. It is understood that a portion of the first wire portion 233 is located at the first peripheral region 20b, and another portion is located at the second peripheral region 20 c.

The second peripheral trace 24 is disposed on the substrate 21 and located in the second peripheral region 20c, and is used for connecting a corresponding second electrode 26. The number of the second peripheral traces 24 may be the same as the number of the second electrodes 26, so that each second electrode 26 is connected to a corresponding second peripheral trace 24. Specifically, the second peripheral trace 24 includes a third connecting pad 241 located in the contact area 20e, a fourth connecting pad 242 located in the bonding area 20d, and a second trace portion 243 connected between the third connecting pad 241 and the fourth connecting pad 242.

The first wire portion 233, the second wire portion 243, the first connection pad 231, and the second connection pad 232 all include a transparent conductive layer 234 and a metal layer 235 stacked on the transparent conductive layer 234. The transparent conductive layer 234 is made of the same material as the first electrode 21 (e.g., both ito materials) and can be formed in the same mask process. Specifically, the transparent conductive layer 234 may be located between the substrate 21 and the metal layer 235. The material of the metal layer 235 may be an opaque metal material, such as a metal material with low impedance, including silver, copper, aluminum, and the like.

The insulating layer 25 corresponds to the touch region 20a, the first peripheral region 20b and the second peripheral region 20c, the insulating layer 25 is disposed on the first electrode 22, the first connection pad 231, the first wire portion 233, the second wire portion 243 and the substrate 11, and the insulating layer 25 includes a first opening 253 corresponding to the bonding region 20d and a second opening 254 corresponding to the contact region 20 e. The first opening 253 is used for exposing the second connecting pad 232 and the fourth connecting pad 242 located in the bonding area 20d to connect the components of the flexible circuit board. The second opening 254 is used to expose the third connection pad 241 located at the contact area 20e, so that the third connection pad 241 is connected to the second electrode 26.

Further, in this embodiment, the touch screen 20 may include two first peripheral areas 20b located at two opposite sides of the touch area 20a, and the insulating layer 25 completely covers the touch area 20a and the first electrodes 22 of the two first peripheral areas 20b, the first connection pads 231 of the first peripheral areas 20b, and a portion of the first routing portions 233. Further, the size of the insulating layer 25 may be substantially equal to the size of the substrate 21, or slightly smaller than the size of the substrate. The insulating layer 25 may include a bottom surface 251 adjacent to the substrate 21 and a side surface 252 connected to the bottom surface 251, and an inclination angle between the bottom surface 251 and the side surface 252 is less than 90 degrees. The thickness of the insulating layer 25 is less than or equal to 10 um. The material of the insulating layer 25 is a transparent insulating material, such as Optical Cement (OC), or thermoplastic elastomer (TPF), etc.

The second electrode 26 is disposed on the insulating layer 25 and extends along a second direction Y different from the first direction X to be overlapped with the first electrode 22 in an insulating manner, the second electrode 26 includes a second main body portion 261 and a second contact pad 262, the second main body portion 261 corresponds to the touch region 20a and is located on the insulating layer 25, the second contact pad 262 is connected to one end of the second main body portion 261 and is located on the substrate 21 of the second peripheral region 20c, and one end of the second contact pad 262 connected to the second main body portion 261 is connected to the second main body portion 261 on the insulating layer 25 through a side surface 252 of the insulating layer 25. The second contact pad 262 further extends to the contact area 20e to connect with the third connection pad 241, so that the second electrode 26 is connected to the second peripheral trace 24, in this embodiment, the second contact pad 262 of the second electrode 26 is overlapped with the third connection pad 241 of the second peripheral trace 24 at the first opening 253 to be electrically connected. Wherein the first direction X and the second direction Y may be perpendicular.

The second body 261 includes a plurality of second electrode portions 263 arranged along the second direction Y and a second connecting bridge 264 connected between two adjacent second electrode portions 263, the first electrode portions 223 and the second electrode portions 263 do not overlap in a direction perpendicular to the touch screen 20, and the first connecting bridge 224 and the second connecting bridge 264 intersect in an insulating manner in the direction perpendicular to the touch screen 20. The shape of the second electrode portion 263 may be, but is not limited to, a diamond shape, a circular shape, and the like. The second connection bridge 264 may have a straight bar shape having a width smaller than that of the second electrode portion 263. The material of the second electrode 26 may be a transparent conductive material, such as Indium Tin Oxide (ITO). It is understood that the number of the second electrodes 26 may be multiple, the multiple second electrodes 26 are disposed at intervals and all extend along the second direction Y and intersect with the multiple first electrodes 22 at the positions of the first connecting bridges 224 and the second connecting bridges 264 in an insulating manner, and the distances between any two adjacent second electrodes 26 may be equal.

Further, in this embodiment, assuming that the process exposure alignment accuracy of the first electrode 22 and the second electrode 26 is K, K is less than or equal to 100um, and the distances between the first electrode portion 223 and two adjacent second electrode portions 263 are a and b, respectively, where 0 ≦ a-b ≦ 2K.

Referring to fig. 7, fig. 7 is a flowchart of a method for manufacturing a touch screen according to the present invention. Specifically, the manufacturing method may be used to form the touch screens 10 and 20 of the first and second embodiments, which includes the following steps S1-S5.

In step S1, a substrate is provided.

The substrate may be the substrate 11 or 21 in any one of the first embodiment and the second embodiment, and the structure thereof is not described herein again.

Step S2, forming a first electrode and a transparent conductive layer on the substrate, and forming a first peripheral trace and a second peripheral trace on the transparent conductive layer and a first contact pad of the first electrode.

The first electrode, the transparent conductive layer and the metal layer may be the first electrode 12, 22, the transparent conductive layer 134, 234 and the metal layer 135, 235 in any one of the first embodiment and the second embodiment, and the structure thereof will not be described herein. Specifically, the step S2 may include the following steps:

forming a first transparent conductive material layer on the substrate 11, 21;

forming a metal material layer on the first transparent conductive material layer;

forming a first photoresist layer on the metal material layer;

exposing and developing the first photoresist layer by using a predetermined mask pattern to etch the first transparent conductive material layer and the metal material layer so as to form the first electrode 11, 21, the transparent conductive layer 134, 234 and the metal layer 135, 235 on the first electrode 11, 21, the transparent conductive layer 134, 234;

removing the first photoresist layer;

forming a second photoresist layer on the metal layers 135 and 235 and the substrates 11 and 21;

exposing and developing the second photoresist layer by using a predetermined mask pattern to etch the metal layers 135 and 235 on the first electrodes 11 and 21 so as to form the first peripheral traces 13 and 23 and the second peripheral traces 14 and 24; and

and removing the second photoresist layer.

Step S3, forming an insulating layer on the first electrode, the first peripheral trace, the second peripheral trace, and the substrate, wherein at least a portion of the insulating layer and a third connection pad of the second peripheral trace do not overlap each other in a direction perpendicular to the touch screen.

The step S3 may include the steps of: and forming dry film photoresist on the first electrode 12, the metal layers 135 and 235 and the substrates 11 and 21, and performing whole-surface exposure, development and baking on the dry film photoresist to form the insulating layers 15 and 25.

Specifically, in the first embodiment, the insulating layer 15 corresponds to the touch area 10a and the first peripheral area 10b and is disposed on the first electrode 12, the first connecting pad 131, at least a portion of the first trace 133 and the substrate 11, and specifically, the insulating layer 15 may completely cover the touch area 10a and the first peripheral area 10b and cover the first electrode 12, the first connecting pad 131 of the first peripheral area 10b and a portion of the first trace 133. In this embodiment, the projections of the insulating layer 15 and the second peripheral area 10c along the direction perpendicular to the touch screen 10 do not overlap, for example, they may just meet or have a predetermined interval, so that the second peripheral traces 14 may be exposed outside the insulating layer 15. It is understood that specific structural features related to the insulating layer 15 have been described in the first embodiment, and are not described herein again.

In a second embodiment, the insulating layer 25 corresponds to the touch region 20a, the first peripheral region 20b and the second peripheral region 20c, the insulating layer 25 is disposed on the first electrode 22, the first connection pad 231, the first wire portion 233, the second wire portion 243 and the substrate 11, and the insulating layer 25 includes a first opening 253 corresponding to the bonding region 20d and a second opening 254 corresponding to the contact region 20 e. The first opening 253 is used for exposing the second connecting pad 232 and the fourth connecting pad 242 located in the bonding area 20d to connect the components of the flexible circuit board. The second opening 254 is used to expose the third connection pad 241 located at the contact area 20e, so that the third connection pad 241 is connected to the second electrode 26. In the second embodiment, it is understood that specific structural features of the insulating layer 25 have been described in the second embodiment, and are not described herein again.

Step S4, forming a second electrode on the insulating layer and the third connection pad, wherein a second contact pad of the second electrode is connected to the third connection pad.

The step S4 may include the steps of:

forming a second transparent conductive material layer on the insulating layers 15 and 25 and the third connection pad 241;

forming a third light resistance layer on the second transparent conductive material layer;

exposing and developing the third photoresist layer by using a predetermined mask pattern to etch the second transparent conductive material layer so as to form the second electrodes 16 and 26; and

and removing the third photoresist layer.

It is understood that specific structural features related to the second electrodes 16, 26 have been described in the first and second embodiments, and are not described herein again.

Compared with the prior art, in the touch screens 10 and 20 and the manufacturing method of the invention, the first electrodes 12 and 22 and the second electrodes 16 and 26 are disposed on different layers, the insulating layers 15 and 25 are disposed on the first electrodes 12 and 22, the first connecting pads 131 and 231 and at least a portion of the first routing portions 133 and 233 corresponding to the touch areas 10a and 20a and the first peripheral areas 10b and 20b, and the second electrodes 16 and 26 are disposed on the insulating layers 15 and 25 and the third connecting pads 141 and 241, so that the insulating layers 15 and 25 do not need to be provided with via holes in the touch areas 10a and 20a and no additional metal bridges are required to be provided for the second electrodes 16 and 26, and the problems of poor lap joint, low yield and the like caused by the via holes and the metal bridges are not easy to occur.

Of course, the present invention is not limited to the above-disclosed embodiments, and various modifications may be made to the above-described embodiments. It will be appreciated by those skilled in the art that changes and modifications to the above embodiments may be made without departing from the true spirit of the invention, and the scope of the invention is to be defined by the appended claims.

Claims (11)

1. A touch screen comprises a substrate, a first electrode, a first peripheral trace, an insulating layer, a second electrode and a second peripheral trace, wherein the touch screen is further divided into a touch area, a first peripheral area positioned on a first side of the touch area, and a second peripheral area positioned on a second side of the touch area and adjacent to the first peripheral area, the second peripheral area comprises a binding area, the first electrode is arranged on the substrate and extends along a first direction, the first electrode comprises a first main body part positioned in the touch area and a first contact pad connected with one end of the first main body part and positioned in the first peripheral area, the first peripheral trace is arranged on the substrate, the first peripheral trace comprises a first connecting pad connected with the first contact pad, a second connecting pad positioned in the binding area and a first trace part connected between the first connecting pad and the second connecting pad, the second peripheral wiring is arranged on the substrate and located in the second peripheral area, the second peripheral wiring comprises a third connecting pad, a fourth connecting pad located in the binding area and a second wiring part connected between the third connecting pad and the fourth connecting pad, and the second peripheral wiring part is characterized in that: the insulating layer corresponds to the touch area and the first peripheral area and is arranged on the first electrode, the first connecting pad and at least part of the first routing part, the second electrode is disposed on the insulating layer and extends in a second direction different from the first direction to overlap the first electrode in an insulating manner, the second electrode comprises a second main body part positioned in the touch area and a second contact pad connected with one end of the second main body part and positioned in the second peripheral area, the second contact pad of the second electrode is connected with the third contact pad of the second peripheral trace, the second peripheral region further includes a contact region disposed on the third contact pad, the insulating layer comprises a second opening corresponding to the contact area, and the second contact pad extends to the contact area and is connected with the third connecting pad.

2. The touch screen of claim 1, wherein: the insulating layer and the projection of the second peripheral area along the direction vertical to the touch screen do not overlap.

3. The touch screen of claim 1, wherein: the insulating layer includes a first opening corresponding to the binding region, and is further disposed on the substrate, the first routing portion, and the second routing portion of the second peripheral region.

4. The touch screen of claim 1, wherein: the number of the first peripheral areas is two, the two first peripheral areas are located on two opposite sides of the touch area, and the insulating layer corresponds to the two first peripheral areas and is arranged on the first connecting pads of the two first peripheral areas and at least part of the first routing parts.

5. The touch screen of claim 1, wherein: the first wire routing part and the second wire routing part both comprise transparent conducting layers and metal layers stacked with the transparent conducting layers.

6. The touch screen of claim 5, wherein: the transparent conductive layer is made of the same material as the first electrode and is formed in the same mask process.

7. The touch screen of claim 1, wherein: the thickness of insulating layer is less than or equal to 10 um.

8. The touch screen of claim 1, wherein: the insulating layer comprises a bottom surface adjacent to the substrate and a side surface connected with the bottom surface, and the inclination angle between the bottom surface and the side surface is smaller than 90 degrees.

9. The touch screen of claim 1, wherein: the first main body part comprises a plurality of first electrode parts arranged along the first direction and a first connecting bridge connected between two adjacent first electrode parts, the second main body part comprises a plurality of second electrode parts arranged along the second direction and a second connecting bridge connected between two adjacent second electrode parts, the first electrode parts and the second electrode parts are not overlapped in the direction perpendicular to the touch screen, and the first connecting bridge and the second connecting bridge are crossed in an insulating mode in the direction perpendicular to the touch screen.

10. The touch screen of claim 9, wherein: setting the process exposure alignment accuracy of the first electrode and the second electrode to be K, wherein K is less than or equal to 100um, setting the distance between the first electrode part and two adjacent second electrode parts to be a and b respectively, and ≦ 0-a-b ≦ 2K.

11. A method of manufacturing a touch screen as claimed in claim 5, comprising the steps of:

providing the substrate;

forming the first electrode and the transparent conductive layer on the substrate, and forming the metal layer on the transparent conductive layer and the first contact pad of the first electrode;

forming the insulating layer on the first electrode and the metal layer, wherein the insulating layer and the third connecting pad are at least partially not overlapped along a direction vertical to the touch screen; and

and forming the second electrode on the insulating layer and the third connecting pad, wherein the second contact pad of the second electrode is lapped with the third connecting pad in the contact area.

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