TWI668614B - Touch panel and touch display device - Google Patents

Abstract

The invention provides a touch panel which divides the connection pads connected by a series of sensing electrodes extending in the same direction into two types with different widths. The width refers to the connection pads along the sensing electrode string connected thereto The length of the row in the extending direction, and the connection pad with a larger width is farther away from the driving circuit than the connection pad with a smaller width, the connection pad connects the sensing electrode string to the wiring so that the sensing electrode string is electrically connected to the Described drive circuit. The touch panel of the present invention can increase the overlapping area of the traces and connection pads located on different layers on the substrate, which facilitates the overlapping of the traces and connection pads located on different layers, and improves the production yield.

Description

Touch panel and touch display device

The invention relates to a touch panel and a touch display device.

Generally, in personal digital assistants (PDAs), notebook computers, office automation equipment, medical instruments, or car navigation systems, etc., touch panels are used to provide input means (click devices) for the displays of the aforementioned devices. Common touch panels include resistive, electromagnetic induction, optical, and capacitive touch panels. Among them, the capacitive type touch panel may use the capacitance change induced between the static electricity of the human body and the transparent electrode for inducing current to confirm the touch position. In order to detect the touch position where a finger or stylus touches the touch panel, a plurality of capacitive touch panel technologies have been developed.

A common capacitive touch panel includes two sets of mutually perpendicular sensor strings, and each sensor string is made of a series of diamond patches connected to each other by a conductive rectangular narrow band (bridge portion). One or both ends of each sensor string are electrically connected to the wiring group through the wiring. In addition, a control circuit may be included. The control circuit is used to: provide an excitation signal to each sensor string through the corresponding wiring group; when the surface of the capacitive touch panel is touched, the control circuit receives the slave sensor Sensing signals generated by the series; and based on the position of the affected diamond-shaped piece in each series to determine the touched position.

With the development of electronic technology, people's requirements for electronic products are also continuously increasing. In order to pursue a larger display window under a fixed size and make the product more beautiful, narrow bezels are the current design trend in the industry. However, when the size of the peripheral area of the touch panel is reduced, the wiring area of the touch panel It is also restricted, reducing the space for routing. The smaller the space for routing, the higher the accuracy requirements when the wiring is lapped with the end of the corresponding sensor series, and lap errors are prone to occur. Resulting in poor yield.

The invention provides a touch panel, including a substrate; a driving circuit; a plurality of first sensing electrode series and a plurality of second sensing electrode series extending across the first sensing electrode series, the first sensor A series of sensing electrodes and a series of second sensing electrodes are disposed on the substrate; a plurality of first connection pads and a plurality of second connection pads, each first connection pad is electrically connected to one end of a series of first sensing electrodes, Each second connection pad is electrically connected to one end of a second sensing electrode series; and a plurality of first traces and a plurality of second traces, each first trace is connected to a first connection pad and is connected to the first The first sensing electrode string connected to the connection pad is electrically connected to the driving circuit, and each second trace is connected to a second connection pad and electrically connects the second sensing electrode string connected to the second connection pad Connected to the drive circuit; the second trace includes a third trace and a fourth trace, the second connection pad includes a third connection pad and a fourth connection pad, each third trace passes through one The third connection pad is electrically connected to a second sensing electrode string , Each fourth trace is electrically connected to a second sensing electrode string through a fourth connection pad; the length of each third connection pad along the extending direction of the second sensing electrode string connected thereto is greater than The length of the fourth connection pad along the extending direction of the first sensing electrode series connected thereto; at least part of the third connection pad and the fourth connection pad are located on the same side of the touch panel, The third connection pad is farther away from the driving circuit than the fourth connection pad on the same side.

The invention also provides a touch display device.

A touch display device, the touch panel defines a central area and a peripheral area surrounding the central area, the sensing electrode is located in the central area, and the connection pad is at least partially located in the peripheral area; The fourth trace is located in the peripheral area, the third trace extends from the peripheral area and is at least partially located in the central area, and the touch panel defines a display corresponding to the display screen of the touch display device Area, the display area is included in the central area, and the third trace is at least partially located in an area between the display area and the central area.

Compared with the conventional technology, the third trace of the touch panel of the present invention at least partially overlaps and is insulated from the sensing electrode in a direction perpendicular to the substrate, and can increase the third trace and the third connection The overlapping area of the pads facilitates the overlapping of the third trace and the third connection pad, and improves the production yield.

100‧‧‧Touch panel

11‧‧‧ substrate

101‧‧‧Central

102‧‧‧ surrounding area

103‧‧‧Display area

104‧‧‧Ink layer tolerance line

12‧‧‧The first sensing electrode series

121‧‧‧First sensing electrode

13‧‧‧Second sensing electrode series

131‧‧‧Second sensing electrode

14‧‧‧ First Bridge Department

15‧‧‧Second Bridge Department

16‧‧‧Insulation

161‧‧‧First through hole

162‧‧‧The second through hole

17‧‧‧Trace

171‧‧‧ First track

172‧‧‧Second alignment

1721‧‧‧Third alignment

1701‧‧‧Part 1

1702‧‧‧Part II

1722‧‧‧Fourth alignment

1703‧‧‧Part III

1704‧‧‧Part 4

18‧‧‧ connection pad

181‧‧‧ First connection pad

182‧‧‧Second connection pad

1821‧‧‧The third connection pad

1822‧‧‧ fourth connection pad

19‧‧‧Drive circuit

FIG. 1 is a schematic plan view of a touch panel according to an embodiment of the invention.

FIG. 2 is a schematic cross-sectional view of FIG. 1 taken along line II-II.

FIG. 3 is a schematic cross-sectional view of FIG. 1 taken along the line III-III.

FIG. 4 is a schematic cross-sectional view of FIG. 1 taken along line IV-IV.

FIG. 5 is a schematic cross-sectional view of FIG. 1 taken along line V-V.

The drawings show embodiments of the present invention. The present invention can be implemented in a plurality of different forms, and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more comprehensive and complete disclosure, and to make those skilled in the art more fully understand the scope of the present invention.

It is understood that although the terms such as first, second, etc. may be used herein to describe various elements, regions, layers, and / or portions, such elements, regions, layers, and / or portions should not be limited to these terms. These terms are only used to distinguish one element, region, layer and / or section from another element, region, layer and / or section. Therefore, as long as it does not depart from the teachings of the present invention, the first element, region, layer, and / or section discussed below may be referred to as the second element, region, layer, and / or section.

Embodiments of the present invention are described here with reference to cross-sectional views, which are schematic diagrams of idealized embodiments (and intermediate structures) of the present invention. Thus, the different shapes of the illustrations due to manufacturing processes and / or tolerances are foreseeable. Therefore, the embodiments of the present invention should not be interpreted as being limited to the specific shape of the region illustrated here, but should include deviations in the shape due to manufacturing, for example. The regions shown in the figures themselves are only schematic, and their shapes are not used to illustrate the actual shape of the device, and are not intended to limit the scope of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art described in the present invention. It should also be understood that terms such as those defined in a general dictionary should be interpreted as having meanings consistent with their meanings in the context of the relevant field, and should not be interpreted as over-idealized or over-formal meanings , Unless explicitly defined in this article.

This embodiment uses a touch panel as an example for description. The touch panel of the present invention can be applied to electronic products with touch panels such as personal digital assistants (PDAs), notebook computers, and smart phones.

Please refer to FIG. 1, which is a schematic plan view of a touch panel 100 according to an embodiment of the invention. In this embodiment, the touch panel 100 is a capacitive touch panel. The touch panel 100 defines a central area 101 for sensing touch operations and a peripheral area 102 surrounding the central area 101. Among them, the central area 101 is defined by the dotted frame with the largest range in FIG. 1.

The touch panel 100 includes a substrate 11, a first sensing electrode string 12 and a second sensing electrode string 13 that are formed on the same surface of the substrate 11 and are located in the central region 101 and are insulated from each other. The second sensing electrode string 13 extends along the first direction (X direction in FIG. 1), the first sensing electrode string 12 extends along the second direction (Y direction in FIG. 1), and the second direction intersects the first direction . In this embodiment, the second direction is orthogonal to the first direction, but it is not limited to this. In other embodiments, the first sensing electrode series 12 and the second sensing electrode series 13 may also be arranged in other forms The cloth, such as the first sensing electrode string 12 and the second sensing electrode string 13 intersect at other angles.

As shown in FIG. 1, the first sensing electrode series 12 includes a plurality of first sensing electrodes 121, and the second sensing electrode series 13 includes a plurality of second sensing electrodes 131. The plurality of first sensing electrodes 121 and the plurality of second sensing electrodes 131 are spaced apart and insulated from each other. In one embodiment, one of the first sensing electrode 121 and the second sensing electrode 131 is a touch driving electrode (Tx), and the other is a touch sensing electrode (Rx).

Each adjacent two first sensing electrodes 121 in each first sensing electrode string 12 are electrically connected by a first bridge portion 14, and each adjacent two of each second sensing electrode strings 13 The second sensing electrode 131 is electrically connected through a second bridge portion 15. Each second bridge portion 15 spans a first bridge portion 14 and at least partially overlaps the first bridge portion 14, and each first bridge portion 14 and its corresponding second bridge portion 15 are insulated by an insulating layer 16 Spaced apart.

Please refer to FIGS. 2 and 3 together. 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. For convenience of description, the insulating layer 16 that insulates the first bridge portion 14 and the second bridge portion 15 (as shown in FIGS. 2 and 3) is omitted in FIG. 1. In this embodiment, the first sensing electrode 121, the second sensing electrode 131, and the first bridge portion 14 are directly formed on the surface of the substrate 11. The insulating layer 16 is formed on the surface of the substrate 11 and covers the first sensing electrode 121, the second sensing electrode 131 and the first bridge portion 14. The insulating layer 16 defines a first through hole 161 therethrough. The insulating layer 16 exposes at least a portion of each second sensing electrode 131 through the first through hole 161. The second bridge portion 15 is formed on the surface of the insulating layer 16 away from the substrate 11, and each adjacent two second sensing electrodes 131 in each second sensing electrode string 13 pass through the first through hole 161 and a second The bridge 15 is electrically connected.

As shown in FIG. 1, the touch panel 100 further includes a plurality of traces 17 located at least partially in the peripheral area 102 and a plurality of connection pads 18 located at least partially in the peripheral area 102. The plurality of traces 17 includes a plurality of first traces 171 and a plurality of second traces 172 insulated from each other, and the connection pad 18 includes a first connection pad 181 and a second connection pad 182. At least one end of each first sensing electrode string 12 is connected to the first connection pad 181; at least one end of each second sensing electrode string 13 is connected to the second connection pad 182, and each first sensing electrode string 12 Pass first The connection pad 181 is electrically connected to a drive circuit 19 via a first trace 171; each second sensing electrode string 13 is electrically connected to the drive circuit 19 via a second connection pad 182 and via a second trace 172.

In this embodiment, the plurality of second traces 172 includes a plurality of insulated third traces 1721 and a plurality of fourth traces 1722, and each third trace 1721 and each fourth trace 1722 can be independently connected to Between a second sensing electrode string 13 and the driving circuit 19. The second connection pad 182 includes a plurality of third connection pads 1821 and a plurality of fourth connection pads 1822. Each third connection pad 1821 and each fourth connection pad 1822 are respectively connected to a second sensing electrode string 13 near the peripheral area 102 Of the end.

In an embodiment, each third connection pad 1821 is connected to the end of a second sensing electrode string 13 electrically connected to the third trace 1721, that is, each third connection pad 1821 is connected to a first Three traces 1721; each fourth connection pad 1822 is connected to the end of a second sensing electrode string 13 electrically connected to the fourth trace 1722, that is, each fourth connection pad 1822 is connected to a fourth Trace 1722.

As shown in FIGS. 4 and 5, in this embodiment, the insulating layer 16 also covers the peripheral area 102. The first trace 171, the first connection pad 181 and the first sensing electrode string 12, the second sensing electrode string 13 and the first bridge portion 14 are formed by patterning the same conductive layer. The first trace 171 and the first A connection pad 181 is covered by the insulating layer 16.

As shown in FIGS. 4 and 5, the third trace 1721 is located on the side of the insulating layer 16 away from the substrate 11, and the fourth trace 1722 is located on the side of the insulating layer 16 near the substrate 11. In this embodiment, the first trace 171, the first connection pad 181, the fourth trace 1722, the third connection pad 1821, and the fourth connection pad 1822 are located on the same layer and are formed by patterning the same conductive layer. The third trace 1721 and the third connection pad 1821 are located on different layers, and are formed by patterning different conductive layers. Each third trace 1721 is electrically connected to the corresponding third connection pad 1821 through the second through hole 162 opened in the insulating layer 16, and the second through hole 162 is located in the peripheral region 102.

In this embodiment, since the third traces 1721 and the fourth traces 1722 are stacked on both sides of the insulating layer 16 and spaced apart by the insulating layer 16, the number of the second traces 172 is constant In this case, the second traces can be arranged on different layers, reducing the area occupied by the traces 17 in the peripheral area 102.

In this embodiment, the third trace 1721 and the second sensing electrode 131 may at least partially overlap on the substrate 11, and the overlapping portions are insulated from each other. In this embodiment, the insulating layer 16 covers the first sensing electrode string 12, the second sensing electrode string 13, the first bridge portion 14, the fourth trace 1722, the third connection pad 1821, and the fourth connection pad 1822. The third trace 1721 is disposed on the insulating layer 16 away from the first sensing electrode series 12, the second sensing electrode series 13, the first bridge portion 14, the fourth trace 1722, the third connection pad 1821, and the fourth One side of the connection pad 1822 is electrically connected to the corresponding third connection pad 1821 through the second through hole 162.

Therefore, even if the projections of the third trace 1721 and the second sensing electrode 131 on the substrate 11 at least partially overlap, the overlapped portions can be insulated from each other by the insulating layer 16 without affecting the performance of the touch panel 100.

As shown in FIG. 1, in this embodiment, each third trace 1721 includes a first portion 1701 and a second portion 1702 connected end to end. One end of the first part 1701 is connected to the drive circuit 19, the second part 1702 extends from the end of the first part 1701 away from the drive circuit 19 in a direction away from the central region 101 to connect to the third connection pad 1821, and the second part 1702 on the substrate 11 The projection overlaps with the projection of the corresponding third connection pad 1821 on the substrate 11, and the projection of the first portion 1701 on the substrate 11 at least partially overlaps with the projection of the second sensing electrode 131 on the substrate 11.

In other embodiments, the first portion 1701 and the second portion 1702 may both be located in the peripheral region 102, and neither the projections of the first portion 1701 and the second portion 1702 and the second sensing electrode 131 on the substrate 11 overlap. In this embodiment, the first portion 1701 extends in the second direction (Y direction in FIG. 1), and the second portion 1702 extends in the first direction (X direction in FIG. 1). Each second through hole 162 at least partially overlaps the corresponding second portion 1702 and third connection pad 1821 on the substrate 11, so that the second portion 1702 can be electrically connected to the third connection pad 1821 through the second through hole 162.

As shown in FIG. 1, each fourth trace 1722 includes a third portion 1703 and a fourth portion 1704 connected end to end. One end of the third portion 1703 is connected to the driving circuit 19. Since the fourth trace 1722, the fourth connection pad 1822, and the second sensing electrode 131 are disposed in the same layer, the third portion 1703 is located in the peripheral area 102 to avoid The second sensing electrodes 131 overlap, and the fourth portion 1704 extends from the end of the third portion 1703 away from the driving circuit 19 toward the central region 101 to the corresponding fourth connection pad 1822.

In this embodiment, the third portion 1703 extends in the second direction (Y direction in FIG. 1), and the fourth portion 1704 extends in the first direction (X direction in FIG. 1). As shown in FIG. 1, the second portion 1702 of the third trace 1721 and the fourth portion 1704 of the fourth trace 1722 extend from the first portion 1701 and the third portion 1703 in opposite directions, respectively.

When the touch panel 100 is applied to an electronic device with a display function, the display screen corresponding to the electronic device of the touch panel 100 may be defined with a display area 103, which is included in the central area 101. The electronic device may be provided with an ink layer corresponding to cover the area between the central area 101 and the display area 103 to prevent the components located in the area between the central area 101 and the display area 103 from being observed by the user of the electronic device.

As shown in FIG. 1, the touch panel 100 may also define an ink layer tolerance line 104, and the distance between the ink layer tolerance line 104 and the adjacent side of the display area 103 is the allowable tolerance range of the edge of the ink layer when it is bonded, The ink layer tolerance line 104 is located between the central area 101 and the display area 103.

In an embodiment, the third trace 1721 and the second sensing electrode 131 in the area between the central area 101 and the display area 103 at least partially overlap on the substrate 11, and the third trace 1721 and the third trace 1721 The overlapping portions of the two sensing electrodes 131 are insulated from each other.

In an embodiment, each third trace 1721 is located on the side of the ink layer tolerance line 104 away from the display area 103. The third trace 1721 and the area between the central area 101 and the ink layer tolerance line 104 The second sensing electrode 131 at least partially overlaps on the substrate 11, and the overlapping portion of the third trace 1721 and the second sensing electrode 131 are insulated from each other, so as to prevent the ink layer from being exposed to the third trace due to tolerance due to bonding 1721. Therefore, the third trace 1721 can be located not only in the peripheral area 102 but also at least partially in the area between the central area 101 and the display area 103.

In an embodiment, the area between the central region 101 and the ink layer tolerance line 104 not only ensures that the third trace 1721 can be covered by the ink layer, but also increases the wiring space of the third trace 1721, so that The second portion 1702 of the three traces 1721 has sufficient space in the third trace 1721 in the peripheral area 102 to extend in the first direction (X direction in FIG. 1), and at the same time, the third connection pad 1821 is also sufficient in the peripheral area 102 The space is able to increase its length along the first direction.

Therefore, in the case where the width of the third connection pad 1821 in the second direction (the Y direction in FIG. 1) is unchanged, the extension of the second portion 1702 in the first direction is the same as the corresponding third connection pad 1821 in the first direction The increase in length can increase the overlapping area of the second portion 1702 of each third trace 1721 and the corresponding third connection pad 1821 on the substrate 11, which reduces the accuracy requirement of the second through hole 162 in the manufacturing process and is effective The third wiring 1721 and the third connection pad 1821 are erroneously connected, and the use of high-precision equipment increases manufacturing costs.

Since the electronic device may be provided with an ink layer covering the area between the central area 101 and the display area 103, even if the third trace 1721 is located in the area between the central area 101 and the display area 103, or located in the central area 101 In the area between the ink layer tolerance line 104, the third trace 1721 will not be observed by the user.

In an embodiment, although the length of the third connection pad 1821 of the touch panel 100 in the first direction (X direction in FIG. 1) is increased, since the fourth trace 1722 and the fourth connection pad 1822 are provided in the same layer (As shown in FIG. 1 and FIG. 3) Therefore, the length of the fourth connection pad 1822 in the first direction (X direction in FIG. 1) should not be too large to avoid excessively occupying the wiring space of the fourth trace 1722. In this embodiment, the length of the fourth connection pad 1822 in the first direction (X direction in FIG. 1) is shorter than the length of the third connection pad 1821 in the first direction (X direction in FIG. 1).

As shown in FIG. 1, in this embodiment, the length of the fourth connection pad 1822 in the first direction (X direction in FIG. 1) is shorter than the length of the third connection pad 1821 in the first direction (X direction in FIG. 1), Therefore, in order not to affect the arrangement space of the fourth traces 1722, in an embodiment, when the third connection pad 1821 and the fourth connection pad 1822 are at least partially located on the same side of the touch panel 100, the side Each fourth connection pad 1822 is closer to the driving circuit 19 than each third connection pad 1821 on the same side.

Therefore, each fourth portion 1704 on the side is closer to the driving circuit 19 than each second portion 1702 on the same side, and the fourth trace 1722 can be connected to the driving circuit without passing through the third connection pad 1821 19. It should not be that the increase in the length of the third connection pad 1821 in the first direction causes the wiring space to decrease.

The touch panel 100 according to the first embodiment of the present invention will be described with specific materials as follows.

Please refer to Figure 1 and Figure 2 again. In this embodiment, the distance between the adjacent sides of the central area 101 and the display area 103 is defined as D1, D1 = 250 μm. The distance between the central zone 101 and the adjacent ink layer tolerance line 104 is defined as D2, D2 = 150 μm. The distance between the ink layer tolerance line 104 and the adjacent side of the display area 103 is the allowable tolerance range when the ink layer is adhered. In this embodiment, the allowable tolerance range when the ink layer is adhered is D1-D2 = 100 μm .

The first portion 1701 of the third trace 1721 is at least partially arranged between the central region 101 and the ink layer tolerance line 104, and the second portion 1702 extends away from the central region 101 from the corresponding first portion 1701. Therefore, the arrangement space of the first portion 1701 is at least D2 = 150 μm. In an embodiment, the distance between the first portion 1701 of a third trace 1721 closest to the ink layer tolerance line 104 and the ink layer tolerance line 104 is 50 μm. The extension length of the second portion 1702 of one of the third traces 1721 along the first direction is D3, and D3 = 250 μm.

In an embodiment, the first part 1701 can be arranged not only in the area between the central zone 101 and the ink layer tolerance line 104, but also the first part 1701 can be arranged in the peripheral zone 102 and be connected to the third connection pad of the peripheral zone 1821 overlaps in a direction perpendicular to the substrate 11.

The extension length of the third connection pad 1821 in the first direction is D4, and D4 = 235 μm. The extension length of the second through hole 162 in the first direction is D5, and D5 = 50 μm. In this embodiment, the overlapping length of the second portion 1702 and the third connection pad 1821 in the direction perpendicular to the substrate 11 is D6, and D6 = 200 μm. That is to say, the range where the second through hole 162 can be opened is 200 μm.

Please refer to FIGS. 1 and 3 again. In this embodiment, the length of the peripheral region 102 along the first direction is D7 = 240 μm, and the third portion 1703, the fourth portion 1704, and the fourth connection pad 1822 of the fourth trace 1722 All are located in the surrounding area 102. In this embodiment, the length of the fourth connection pad 1822 in the first direction is D8 = 110 μm, and the length of the arrangement space of the fourth trace 1722 in the peripheral area 102 in the first direction is D9 = D7-D8 = 130 μm .

It can be seen that the length D4 of the third connection pad 1821 in the first direction is greater than the length D8 of the fourth connection pad 1822 in the first direction. Since the third trace 1721 uses at least part of the area of the central area 101 for wiring, the current In the embodiment, the wiring space of the third trace 1721 in the first direction is the area of the peripheral area 102 plus the area between the central area 101 and the ink layer tolerance line 104, that is, the wiring of the third trace 1721 in the first direction The length of the space is D2 + D7 = 390μm.

Therefore, in the case where the line width and the line pitch of the first portion 1701 of the third trace 1721 are unchanged, the second portion 1702 of the third trace 1721 also has more room for extension. At the same time, when the width of the third connection pad 1821 in the second direction (the Y direction in FIG. 1) is unchanged, the extension of the second portion 1702 and the length of the corresponding third connection pad 1821 in the first direction increase The overlapping area of the second portion 1702 of each third trace 1721 and the corresponding third connection pad 1821 in the direction perpendicular to the substrate 11 can be increased, reducing the accuracy requirement of the second through hole 162 in the manufacturing process , To effectively avoid the wrong connection between the third trace 1721 and the third connection pad 1821.

The specific materials used in the above content are only used to illustrate the present invention, and the touch panel 100 of the present invention is not limited to the above specific materials.

In this embodiment, the first sensing electrode 121 is a touch driving electrode, and the second sensing electrode 131 is a touch sensing electrode. The driving circuit 19 inputs a driving signal to the first sensing electrode 121, and a corresponding sensing signal is also generated on each second sensing electrode 131. When touch occurs, the touch point will produce electrode discharge, dielectric constant change between the electrodes, etc., resulting in changes in the capacitance there. Therefore, when the corresponding first sensing electrode 121 is scanned , The sensing signal on the second sensing electrode 131 corresponding to the touch point will also change, so that the touch position can be determined and touch can be realized.

In an embodiment, the material of the substrate 11 can be selected from transparent glass or transparent quartz; the material of the substrate 11 can also be selected from transparent plastic, such as selected from polyether ash (PES), polyethylene naphthalate One or more of (PEN), polyethylene (PE), polyimide (PI), polyvinyl chloride (PVC), polyethylene terephthalate (PET); in other embodiments The material of the substrate 11 can be ceramic or silicon. In an embodiment, the material of the substrate 11 may be flexible.

The first sensing electrode 121, the second sensing electrode 131, the first bridge portion 14 and the fourth trace 1722 may be provided in the same layer. In an embodiment, the first sensing electrode 121 and the second sensing electrode 131 1. The first bridge portion 14 and the third trace 1721 can be formed in the same manufacturing process. The second bridge portion 15 and the third trace 1721 may be provided on the same layer. In an embodiment, the second bridge portion 15 and the third trace 1721 can be formed in the same process. The first sensing electrode 121, the second sensing electrode 131, the first bridge portion 14, the second bridge portion 15, the third trace 1721 and the fourth trace 1722 are all conductive materials.

In an embodiment, the materials of the first sensing electrode 121, the second sensing electrode 131, the first bridge portion 14 and the third trace 1721 may be transparent conductive materials, such as selected from indium tin oxide (ITO) and oxide One or more of aluminum zinc (AZO).

In an embodiment, the materials of the second bridge portion 15 and the third trace 1721 may be transparent conductive materials, such as one or more selected from indium tin oxide (ITO) and aluminum zinc oxide (AZO). In an embodiment, the materials of the second bridge portion 15 and the third trace 1721 can be metal, which can be selected from aluminum (Al), silver (Ag), Gold (Au), Cobalt (Co), Chromium (Cr), Copper (Cu), Indium (In), Manganese (Mn), Molybdenum (Mo), Nickel (Ni), Neodymium (Nd), Palladium (Pd), At least one of platinum (Pt), titanium (Ti), tungsten (W), and zinc (Zn).

The above embodiments are only used to illustrate the technical solutions of the present invention but not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced, Without departing from the spirit and scope of the technical solution of the present invention.

Claims (9)

A touch panel is improved in that it includes: a substrate; a driving circuit; a plurality of first sensing electrode series and a plurality of second sensing electrode series extending across the first sensing electrode series, the first The sensing electrode series and the second sensing electrode series are disposed on the substrate; the plurality of first connection pads and the plurality of second connection pads, each first connection pad is electrically connected to one end of the first sensing electrode series , Each second connection pad is electrically connected to one end of a second sensing electrode series; and a plurality of first traces and a plurality of second traces, each first trace is connected to a first connection pad and will be connected to the first A series of first sensing electrodes connected by a connection pad is electrically connected to the driving circuit, and each second trace is connected to a second connection pad and connects a series of second sensing electrodes connected to the second connection pad Electrically connected to the driving circuit; the second trace includes a third trace and a fourth trace, the second connection pad includes a third connection pad and a fourth connection pad, and each third trace passes A third connection pad is electrically connected to a second sensing electrode Column, each fourth trace is electrically connected to a second sensing electrode string through a fourth connection pad; the length of each third connection pad along the extending direction of the second sensing electrode string connected thereto is greater than The length of the fourth connection pad along the extending direction of the second sensing electrode string connected thereto; at least part of the third connection pad and the fourth connection pad are located on the same side of the touch panel, so The third connection pad is farther away from the driving circuit than the fourth connection pad on the same side; the projection of the third trace on the substrate and the second sensing electrode are arranged in series on the substrate The projections on the at least partially overlap, and the third trace is insulated from the overlapping portion of the second sensing electrode string. The touch panel according to claim 1, wherein the touch panel defines a central area and a peripheral area surrounding the central area, and the first sensing electrode and the second sensing electrode are located at the In the central area, the first connection pad and the second connection pad are at least partially located in the peripheral area; each third trace includes a first portion and a second portion connected end to end, one end of the first portion is connected to the drive Circuit connection, the second part extends from an end of the first part away from the driving circuit in a direction away from the central region to connect to a third connection pad; each fourth trace includes a third part connected end to end And the fourth part, one end of the third part is connected to the driving circuit, and the fourth part extends from the end of the third part away from the driving circuit to the direction close to the central area to the corresponding fourth connection pad. The touch panel according to claim 2, wherein: the fourth trace is located in a peripheral area; and the third trace extends from the peripheral area at least partially to the central area. The touch panel according to claim 1, wherein the touch panel further includes an insulating layer on the substrate, and the third trace and the fourth trace are separated by the insulating layer . The touch panel according to claim 4, wherein: the third connection pad, the fourth connection pad, and the fourth trace are formed of the same conductive layer, and the insulating layer covers the third connection pad , The fourth connection pad and the fourth trace, the third trace is located on a side of the insulating layer away from the third connection pad, the fourth connection pad, and the fourth trace The insulating layer is provided with a through hole penetrating therethrough, and the third trace and the third connection pad are electrically connected through the through hole. A touch display device including the touch panel according to any one of the request items 1-5, the touch panel defines a central area and a peripheral area surrounding the central area, and the first sensing electrode And the second sensing electrode are located in the central area, and the first connection pad and the second connection pad are at least partially located in the peripheral area. The touch display device according to claim 6, wherein: the touch panel defines a display area corresponding to a display screen of the touch display device, the display area is included in the central area, the first The three traces are at least partially located in the area between the display area and the central area. The touch display device according to claim 7, wherein the touch display device further includes an ink layer corresponding to an area covering the display area and the central area, and the third trace is Covered by ink layer. The touch display device according to claim 8, wherein the touch panel further defines an ink layer tolerance line, the ink layer tolerance line is located between the display area and the central area, and the ink layer The tolerance range of the edge of is located between the ink layer tolerance line and the display area, and each of the third traces is located on the side of the ink layer tolerance line away from the display area.