CN111475055A

CN111475055A - Touch panel

Info

Publication number: CN111475055A
Application number: CN202010475947.3A
Authority: CN
Inventors: 戴呈安; 简钰峰; 郭文瑞
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-12-13
Filing date: 2020-05-29
Publication date: 2020-07-31
Anticipated expiration: 2040-05-29
Also published as: CN111475055B; TWI722717B; TW202122986A

Abstract

A touch panel comprises a substrate, a first conductive layer, a second conductive layer, an insulating layer, a plurality of first bonding pads and a plurality of second bonding pads. The first conductive layer is provided with a plurality of first touch electrodes and a plurality of virtual electrodes. The plurality of first touch electrodes and the plurality of dummy electrodes are structurally separated from each other and arranged in a first direction. The second conductive layer is provided with a plurality of second touch control electrodes. The plurality of second touch electrodes are structurally separated from each other and arranged in a second direction. The first direction is staggered with the second direction. The insulating layer is arranged between the first conductive layer and the second conductive layer, so that the plurality of first touch control electrodes are electrically independent from the plurality of second touch control electrodes. The first touch electrodes are electrically connected to the first bonding pads. The second touch electrodes are electrically connected to the dummy electrodes of the first conductive layer through the contact windows of the insulating layer, and the dummy electrodes are electrically connected to the second bonding pads.

Description

Touch panel

Technical Field

The present disclosure relates to electronic devices, and particularly to a touch panel.

Background

The touch panel has the advantage of convenient operation, and thus is widely installed in electronic products (e.g., mobile phones, tablet computers, satellite navigation systems, etc.). Generally, a touch device may include a substrate, a plurality of first touch electrodes arranged in a first direction, a plurality of second touch electrodes arranged in a second direction, and a plurality of bonding pads arranged in the first direction and electrically connected to a touch driving circuit. In order to electrically connect the second touch electrode to the bonding pad, peripheral traces are required to be disposed on the left and right sides of the touch area of the touch device, so that the width of the frame of the touch panel cannot be further reduced. If the width of the frame of the touch panel cannot be reduced, the width of the entire frame of the touch display device including the touch panel and the display panel cannot be reduced.

Disclosure of Invention

The present invention provides a touch panel having an ultra-narrow bezel, even no bezel, on at least one side.

The invention provides a touch panel, which comprises a substrate, a first conductive layer, a second conductive layer, an insulating layer, a plurality of first bonding pads and a plurality of second bonding pads. The substrate is provided with a touch area and a peripheral area, wherein the peripheral area is positioned on one side of the touch area. The first conductive layer is disposed on the substrate, wherein the first conductive layer has a plurality of first touch electrodes and a plurality of dummy electrodes, the plurality of first touch electrodes and the plurality of dummy electrodes are located in the touch area and structurally separated from each other, the plurality of first touch electrodes and the plurality of dummy electrodes are arranged in a first direction, and each dummy electrode is disposed between two adjacent ones of the plurality of first touch electrodes. The second conductive layer is disposed on the substrate, wherein the second conductive layer has a plurality of second touch electrodes, the plurality of second touch electrodes are located in the touch area and are structurally separated from each other, the plurality of second touch electrodes are arranged in a second direction, and the first direction and the second direction are staggered. The insulating layer is arranged between the first conductive layer and the second conductive layer, so that the plurality of first touch control electrodes are electrically independent from the plurality of second touch control electrodes. The insulating layer has a plurality of contact windows. The plurality of first bonding pads are disposed on the peripheral region of the substrate, wherein the plurality of first touch electrodes are electrically connected to the plurality of first bonding pads. The plurality of second bonding pads are disposed on the peripheral region of the substrate, wherein the plurality of second touch electrodes of the second conductive layer are electrically connected to the plurality of dummy electrodes of the first conductive layer through the plurality of contact windows of the insulating layer, and the plurality of dummy electrodes are electrically connected to the plurality of second bonding pads.

In an embodiment of the invention, the dummy electrode has a first portion and a second portion, the first portion and the second portion are arranged in the second direction, the first portion overlaps at least one contact window of the insulating layer and is electrically connected to the second bonding pad, the second portion crosses over at least one second touch electrode, and the first portion and the second portion are disconnected.

In an embodiment of the invention, the first conductive layer and the second conductive layer have a plurality of repeating structures arranged in the touch region in an array, and a portion of the first conductive layer of one repeating structure and a portion of the second conductive layer of the repeating structure have a coupling capacitance Cm, where Cm is less than or equal to 1.5 pF.

In an embodiment of the invention, each of the first touch electrodes has a first side and a second side opposite to each other, the plurality of dummy electrodes includes a plurality of first dummy electrodes and a plurality of second dummy electrodes, the plurality of first dummy electrodes and the plurality of second dummy electrodes are structurally separated, the plurality of first dummy electrodes are disposed on the plurality of first sides of the plurality of first touch electrodes, the plurality of second dummy electrodes are disposed on the plurality of second sides of the plurality of first touch electrodes, and one second touch electrode is electrically connected to one first dummy electrode and one second dummy electrode disposed on the first side and the second side of the same first touch electrode.

In an embodiment of the invention, the plurality of virtual electrode groups include a plurality of first virtual electrodes and a plurality of second virtual electrodes, and each virtual electrode group includes a first virtual electrode and a second virtual electrode respectively located on a first side and a second side of a same first touch electrode; the touch area comprises a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each second touch electrode is provided with a first part and a second part which are respectively positioned in the first sub-touch area and the second sub-touch area; the first portion and the second portion of the second touch electrode are electrically connected to the different virtual electrode groups respectively.

In an embodiment of the invention, each of the first touch electrodes has a first side and a second side opposite to each other, and the plurality of dummy electrodes are disposed on the first sides of the plurality of first touch electrodes.

In an embodiment of the invention, each of the first touch electrodes has a first side and a second side opposite to each other, the plurality of dummy electrodes includes a plurality of first dummy electrodes and a plurality of second dummy electrodes, the plurality of first dummy electrodes are disposed on the plurality of first sides of the plurality of first touch electrodes, and the plurality of second dummy electrodes are disposed on the plurality of second sides of the plurality of first touch electrodes; the touch area comprises a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each second touch electrode is provided with a first part and a second part which are respectively positioned in the first sub-touch area and the second sub-touch area; the first portion and the second portion of a second touch electrode are respectively electrically connected to a first virtual electrode and a second virtual electrode, and at least one first touch electrode is arranged between the first virtual electrode and the second virtual electrode.

In an embodiment of the invention, the touch area includes a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each of the second touch electrodes includes a first portion and a second portion respectively located in the first sub-touch area and the second sub-touch area; the first portion and the second portion of the second touch electrode are structurally separated and are electrically connected to the different virtual electrodes respectively.

Drawings

Fig. 1 is a schematic cross-sectional view of a touch display device 10 according to an embodiment of the invention.

Fig. 2 is a schematic top view of a touch panel 100 according to a first embodiment of the invention.

Fig. 3 illustrates the first conductive layer 120 on the touch area 110a of fig. 2.

Fig. 4 illustrates the second conductive layer 140 on the touch region 110a of fig. 2.

Fig. 5 illustrates the second touch electrode 142 of the second conductive layer 140, the dummy electrode 124 of the first conductive layer 120, and the contact window 132 of the insulating layer 130 on the touch area 110a of fig. 2.

Fig. 6 is an enlarged schematic view of the intersection R of fig. 5.

Fig. 7 is a schematic cross-sectional view of a touch panel 100 according to a first embodiment of the invention.

Fig. 8 is an enlarged schematic view of the repeating structure U of fig. 2.

Fig. 9 is a schematic top view of a touch panel 100A according to a second embodiment of the invention.

Fig. 10 illustrates the first conductive layer 120A on the touch region 110A of fig. 9.

Fig. 11 illustrates the second conductive layer 140 on the touch region 110a of fig. 9.

Fig. 12 illustrates the second touch electrode 142 of the second conductive layer 140, the dummy electrode 124 of the first conductive layer 120A, and the contact window 132 of the insulating layer 130 on the touch area 110A of fig. 9.

Fig. 13 is a schematic top view of a touch panel 100B according to a third embodiment of the invention.

Fig. 14 illustrates the first conductive layer 120B on the touch region 110a of fig. 13.

Fig. 15 illustrates the second conductive layer 140 on the touch area 110a of fig. 13.

Fig. 16 illustrates the second touch electrode 142 of the second conductive layer 140, the dummy electrode 124 of the first conductive layer 120B, and the contact window 132 of the insulating layer 130 on the touch area 110a of fig. 13.

Fig. 17 is a schematic top view of a touch panel 100C according to a fourth embodiment of the invention.

Fig. 18 illustrates the first conductive layer 120C on the touch region 110a of fig. 17.

Fig. 19 illustrates the second conductive layer 140 on the touch region 110a of fig. 17.

Fig. 20 illustrates the second touch electrode 142 of the second conductive layer 140, the dummy electrode 124 of the first conductive layer 120C, and the contact window 132 of the insulating layer 130 on the touch area 110a of fig. 17.

Fig. 21 is a schematic top view of a touch panel 100D according to a fifth embodiment of the invention.

Fig. 22 illustrates the first conductive layer 120D on the touch region 110a of fig. 21.

Fig. 23 illustrates the second conductive layer 140D on the touch region 110a of fig. 21.

Fig. 24 illustrates the second touch electrode 142 of the second conductive layer 140D, the dummy electrode 124 of the first conductive layer 120D, and the contact window 132 of the insulating layer 130 on the touch area 110a of fig. 21.

Description of reference numerals:

10: touch control display device

100. 100A, 100B, 100C, 100D: touch panel

110: substrate

110 a: touch control area

110 a-1: first sub-touch area

110 a-2: second sub-touch area

110 b: peripheral zone

120. 120A, 120B, 120C, 120D: first conductive layer

122: first touch electrode

124: virtual electrode

124 a: the first part

124 b: the second part

124-1: a first dummy electrode

124-2: second dummy electrode

130: insulating layer

132: contact window

140. 140D: second conductive layer

142: second touch electrode

142 a: the first part

142 b: the second part

144: virtual electrode

152: first bonding pad

154: second bonding pad

200: display panel

300: adhesive layer

A-A': cutting line

G: virtual electrode group

R: interleaved zone

L1 first conductor

L2 second conductor

U: repeating structure

x: a first direction

y: second direction

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Further, "electrically connected" or "coupled" may mean that there are additional elements between the elements.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ± 30%, ± 20%, ± 10%, ± 5%. Further, as used herein, "about", "approximately" or "substantially" may be selected based on optical properties, etch properties, or other properties, with a more acceptable range of deviation or standard deviation, and not all properties may be applied with one standard deviation.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1, the touch display device 10 includes a touch panel 100 and a display panel 200, wherein a touch area 110a of the touch panel 100 overlaps a display area 200a of the display panel 200.

The touch panel 100 includes a substrate 110, and a first conductive layer 120, an insulating layer 130, and a second conductive layer 140 formed on the substrate 110. For example, in the present embodiment, the substrate 110 of the touch panel 100 may be a cover sheet (cover lens) of the touch display device 10, and the touch panel 100 may be attached to the display panel 200 by the adhesive layer 300. In other words, in the present embodiment, the touch panel 100 may be an out-cell (out-cell) touch panel. However, the invention is not limited thereto, and according to other embodiments, the touch panel 100 may be an on-cell (on-cell), an in-cell (in-cell) or other types of touch panels.

Fig. 6 is an enlarged schematic view of the intersection R of fig. 5.

Fig. 7 is a schematic cross-sectional view of a touch panel 100 according to a first embodiment of the invention. Fig. 7 corresponds to section line a-a' of fig. 6.

Fig. 8 is an enlarged schematic view of the repeating structure U of fig. 2.

It should be noted that, for the sake of clarity, fig. 2 to fig. 5 represent the grid-shaped first touch electrodes 122, the grid-shaped virtual electrodes 124, the grid-shaped second touch electrodes 142, and the grid-shaped virtual electrodes 144 of fig. 6 and fig. 8 by simplified frames. In addition, fig. 8 omits illustration of the contact window 132 of the insulating layer 130.

Referring to fig. 2, the touch panel 100 includes a substrate 110, the substrate 110 has a touch area 110a and a peripheral area 110B, wherein the peripheral area 110B is located at one side of the touch area 110 a. for example, in the present embodiment, the peripheral area 110B may be an outer lead bonding (O L B) area located at the lower side of the touch area 110 a. in the present embodiment, the substrate 110 may be made of glass, quartz, organic polymer or other suitable materials.

Referring to fig. 2 and 3, the touch panel 100 includes a first conductive layer 120. The first conductive layer 120 is disposed on the substrate 110. The first conductive layer 120 has a plurality of first touch electrodes 122 and a plurality of dummy electrodes 124. The plurality of first touch electrodes 122 and the plurality of dummy electrodes 124 are located on the touch area 110a of the substrate 110 and are structurally separated from each other. The plurality of first touch electrodes 122 and the plurality of dummy electrodes 124 are arranged in the first direction x, and each dummy electrode 124 is disposed between two adjacent first touch electrodes 122.

Referring to fig. 2 and 8, for example, in the present embodiment, the first touch electrode 122 and the dummy electrode 124 may be a plurality of grid electrodes formed by interweaving a plurality of first wires L1, in the present embodiment, the first conductive layer 120 may be a first metal layer, that is, the first touch electrode 122 and the dummy electrode 124 may be a plurality of metal grid (metal mesh) electrodes, but the invention is not limited thereto.

Referring to fig. 2 and 4, the touch panel 100 further includes a second conductive layer 140. The second conductive layer 140 is disposed on the substrate 110. The second conductive layer 140 has a plurality of second touch electrodes 142. One of the first touch electrode 122 and the second touch electrode 142 is a Transmission (Tx) electrode. The other of the first touch electrode 122 and the second touch electrode 142 is a receiving (Rx) electrode. The plurality of second touch electrodes 142 are located on the touch area 110a of the substrate 110, and the plurality of second touch electrodes 142 are structurally separated from each other. The plurality of second touch electrodes 142 are arranged in a second direction y, and the first direction x intersects with the second direction y. That is, the first touch electrodes 122 and the second touch electrodes 142 are disposed alternately. For example, in the embodiment, the first direction x is substantially perpendicular to the second direction y, but the invention is not limited thereto.

In the present embodiment, the second conductive layer 140 further includes a plurality of dummy electrodes 144. The second touch electrodes 142 and the dummy electrodes 144 are located on the touch area 110a of the substrate 110 and are structurally separated from each other. The plurality of second touch electrodes 142 and the plurality of dummy electrodes 144 are arranged in the second direction y, and each dummy electrode 144 is disposed between two adjacent second touch electrodes 142.

Referring to fig. 2 and 8, for example, in the present embodiment, the second touch electrode 142 and the dummy electrode 144 may be a plurality of grid electrodes formed by interleaving a plurality of second wires L2, in the present embodiment, the second conductive layer 140 may be a second metal layer, that is, the second touch electrode 142 and the dummy electrode 144 may be a plurality of metal grid (metal mesh) electrodes, but the invention is not limited thereto.

Referring to fig. 1 and 2, the touch panel 100 further includes an insulating layer 130. The insulating layer 130 is disposed between the first conductive layer 120 and the second conductive layer 140, so that the plurality of first touch electrodes 122 of the first conductive layer 120 are electrically independent from the plurality of second touch electrodes 142 of the second conductive layer 140. For example, in the present embodiment, the material of the insulating layer 130 may be an inorganic material (e.g., silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two of the above materials), an organic material, or a combination thereof.

Referring to fig. 2, the touch panel 100 further includes a plurality of first bonding pads 152 and a plurality of second bonding pads 154. The first bonding pads 152 and the second bonding pads 154 are disposed on the peripheral region 110b of the substrate 110. The first bonding pads 152 and the second bonding pads 154 are disposed on a single side of the touch area 110 a. The first touch electrode 122 is electrically connected to the first bonding pad 152. The second touch electrode 142 is electrically connected to the second bonding pad 154. The first bonding pads 152 and the second bonding pads 154 are electrically connected to a touch driving circuit (not shown).

In the present embodiment, the first bonding pad 152 can be formed by using the first conductive layer 120, the second conductive layer 140, another conductive layer (not shown), or a combination of at least two of the above-mentioned layers; the second bonding pad 154 may be fabricated using the first conductive layer 120, the second conductive layer 140, other conductive layers (not shown), or a combination of at least two of the foregoing; the invention is not limited.

Referring to fig. 2, 5, 6 and 7, it is noted that the second touch electrode 142 of the second conductive layer 140 is electrically connected to the dummy electrode 124 of the first conductive layer 120 through the contact window 132 of the insulating layer 130, and the dummy electrode 124 is electrically connected to the second bonding pad 154. In other words, the dummy electrode 124 of the first conductive layer 120 is used as a touch signal line of the second touch electrode 142; the second touch electrode 142 is electrically connected to the second bonding pad 154 by the dummy electrode 124 of the first conductive layer 120 disposed in the touch area 110a, but not electrically connected to the second bonding pad 154 by the peripheral trace disposed outside the touch area 110 a. Therefore, the touch panel 100 has an ultra-narrow bezel, which helps to reduce the width of the entire bezel of the touch display device 10.

Referring to fig. 2, 5 and 6, in the present embodiment, the dummy electrode 124 of the first conductive layer 120 and the second touch electrode 142 of the second conductive layer 140 are interleaved to form an interleaved region R (shown in fig. 5 and 6). in the interleaved region R, the plurality of first wires L1 of the dummy electrode 124 of the first conductive layer 120 and the plurality of second wires L2 of the second touch electrode 142 of the second conductive layer 140 form M interleaved points, at N interleaved points of the M interleaved points, the first wires L1 of the dummy electrode 124 and the second wires L2 of the second touch electrode 142 are in electrical contact with each other, M and N are positive integers, and M ≧ N, preferably, (N/M) ≧ 50%, for example, (N/M) ≧ 100%, that is, in the interleaved region R, the plurality of first wires L1 of the dummy electrode 124 and the plurality of second wires L2 of the second touch electrode 142 are in all interleaved positions, but the invention is not limited to electrical contact.

Referring to fig. 2 and 3, in the present embodiment, a dummy electrode 124 of the first conductive layer 120 has a first portion 124a and a second portion 124b (shown in fig. 3), the first portion 124a and the second portion 124b of the dummy electrode 124 are arranged in the second direction y, the first portion 124a of the dummy electrode 124 of the first conductive layer 120 overlaps the contact window 132 of the insulating layer 130 and is electrically connected to the second bonding pad 154, the second portion 124b crosses over at least one second touch electrode 142, and the first portion 124a and the second portion 124b are disconnected. Therefore, the probability of ghost problems during operation of the touch panel 100 can be reduced.

Fig. 8 shows a repeating structure U of the first conductive layer 120 and the second conductive layer 140 on the touch area 110a of fig. 2. Referring to fig. 2 and 8, the first touch electrode 122 and the virtual electrode 124 of the first conductive layer 120 and the second touch electrode 142 and the virtual electrode 144 of the second conductive layer 140 on the touch region 110a may be formed by a plurality of repeating structures U arranged in an array, and a portion of the first conductive layer 120 and a portion of the second conductive layer 140 of each repeating structure U have a coupling capacitance Cm, where Cm is less than or equal to 1.5pF, so as to facilitate driving of the touch panel 100.

Referring to fig. 2 and 5, in the present embodiment, each of the first touch electrodes 122 has a first side (e.g., a right side) and a second side (e.g., a left side) opposite to each other, the plurality of dummy electrodes 124 of the first conductive layer 120 includes a plurality of first dummy electrodes 124-1 and a plurality of second dummy electrodes 124-2, the plurality of first dummy electrodes 124-1 and the plurality of second dummy electrodes 124-2 are structurally separated, the plurality of first dummy electrodes 124-1 are disposed on the plurality of first sides (e.g., the right side) of the plurality of first touch electrodes 122, the plurality of second dummy electrodes 124-2 are disposed on the plurality of second sides (e.g., the left side) of the plurality of first touch electrodes 122, and each second touch electrode 142 is electrically connected to a first dummy electrode 124-1 and a second dummy electrode 124-2 located on the first side and the second side of the same first touch electrode 122.

Referring to fig. 5, more specifically, the first dummy electrodes 124-1 and the second dummy electrodes 124-2 form a plurality of dummy electrode groups G, each of the dummy electrode groups G includes a first dummy electrode 124-1 and a second dummy electrode 124-2 respectively located at a first side and a second side of the same first touch electrode 122; the touch area 110a includes a first sub-touch area 110a-1 and a second sub-touch area 110a-2 outside the first sub-touch area 110a-1, and each of the second touch electrodes 142 has a first portion 142a and a second portion 142b respectively located in the first sub-touch area 110a-1 and the second sub-touch area 110 a-2; in the present embodiment, the first portion 142a and the second portion 142b of the same second touch electrode 142 can be electrically connected to the first dummy electrodes 124-1 and the second dummy electrodes 124-2 of different dummy electrode groups G, respectively.

In other words, in the present embodiment, the dummy electrodes 124 used as the touch signal lines of the same second touch electrode 142 are disposed on two opposite sides of the same first touch electrode 122, and the dummy electrodes 124 used as the touch signal lines of the same second touch electrode 142 are disposed on the first sub-touch area 110a-1 and the second sub-touch area 110a-2 on two sides of the touch area 110 a.

It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, which will not be repeated below.

It should be noted that, for the sake of clarity, fig. 9 to 12 are simplified frames to represent the grid-shaped first touch electrode 122, the grid-shaped virtual electrode 124, the grid-shaped second touch electrode 142 and the grid-shaped virtual electrode 144.

Referring to fig. 9, 10, 11 and 12, a touch panel 100A of the second embodiment is similar to the touch panel 100 of the first embodiment, and the difference therebetween is: in the second embodiment, as shown in fig. 12, the first portion 142a of a second touch electrode 142 is electrically connected to a virtual electrode group G, and the virtual electrode group G used as a touch signal line of the second touch electrode 142 is disposed in the single-sided first sub-touch region 110a-1 of the touch region 110 a.

It should be noted that, for the sake of clarity, the first touch electrodes 122, the

virtual electrodes

124, 142 and 144 in the grid pattern are simply represented by simplified frames in fig. 13 to 16.

Referring to fig. 13, 14, 15 and 16, a touch panel 100B of the third embodiment is similar to the touch panel 100 of the first embodiment, and the difference therebetween is that: in the third embodiment, as shown in fig. 13 and 16, each of the first touch electrodes 122 has a first side (e.g., right side) and a second side (e.g., left side) opposite to each other, and the dummy electrodes 124 used as touch signal lines are disposed on the first side (e.g., right side) of the corresponding first touch electrode 122. That is, in the third embodiment, there is only one dummy electrode 124 between two adjacent first touch electrodes 122, and the dummy electrode 124 has a larger width.

In addition, referring to fig. 13 and fig. 16, in the third embodiment, each of the first touch electrodes 122 has a first side (e.g., a right side) and a second side (e.g., a left side) opposite to each other, the plurality of dummy electrodes 124 includes a plurality of first dummy electrodes 124-1 and a plurality of second dummy electrodes 124-2, the plurality of first dummy electrodes 124-1 are disposed on the plurality of first sides of the plurality of first touch electrodes 122, and the plurality of second dummy electrodes 124-2 are disposed on the plurality of second sides of the plurality of first touch electrodes 122; the touch area 110a includes a first sub-touch area 110a-1 and a second sub-touch area 110a-2 outside the first sub-touch area 110a-1, and each of the second touch electrodes 142 has a first portion 142a and a second portion 142b respectively located in the first sub-touch area 110a-1 and the second sub-touch area 110 a-2; the first portion 142a and the second portion 142b of one second touch electrode 142 are electrically connected to the first dummy electrode 124-1 and the second dummy electrode 124-2, respectively, and other first touch electrodes 122 are disposed between the first dummy electrode 124-1 and the second dummy electrode 124-2 electrically connected to the same second touch electrode 142.

In other words, in the third embodiment, the virtual electrodes 124 used as the touch signal lines are disposed on one side of the corresponding first touch electrodes 122, and the plurality of virtual electrodes 124 are disposed on the first sub-touch area 110a-1 and the second sub-touch area 110a-2 on two sides of the touch area 110 a.

It should be noted that, for the sake of clarity, the simplified frames in fig. 17 to 20 represent the grid-shaped first touch electrode 122, the grid-shaped virtual electrode 124, the grid-shaped second touch electrode 142, and the grid-shaped virtual electrode 144.

Referring to fig. 17, 18, 19 and 20, a touch panel 100C of the fourth embodiment is similar to the touch panel 100B of the third embodiment, and the difference therebetween is: in the fourth embodiment, as shown in fig. 17 and 20, one second touch electrode 142 is electrically connected to only one virtual electrode (e.g., the first virtual electrode 124-1), and a plurality of virtual electrodes (e.g., the first virtual electrodes 124-1) used as a plurality of touch signal lines are disposed on a single side of the first sub-touch area 110a-1 of the touch area 110 a.

It should be noted that, for the sake of clarity, the simplified frames in fig. 21 to 24 represent the grid-shaped first touch electrode 122, the grid-shaped virtual electrode 124, the grid-shaped second touch electrode 142, and the grid-shaped virtual electrode 144.

Referring to fig. 21, fig. 22, fig. 23 and fig. 24, a touch panel 100D of a fifth embodiment is similar to the touch panel 100 of the first embodiment, and the difference therebetween is: in the fifth embodiment, as shown in fig. 23 and 24, the second touch electrode 142 includes a first portion 142a and a second portion 142b respectively located in the first sub-touch area 110a-1 and the second sub-touch area 110a-2, and the first portion 142a and the second portion 142b are structurally separated and electrically connected to different virtual electrodes 124 respectively. Therefore, the coupling capacitance between the first conductive layer 120D and the second conductive layer 140D of the touch panel 100D can be reduced, which is helpful for driving the touch panel 100D.

Claims

1. A touch panel, comprising:

the touch screen comprises a substrate, a first touch screen, a second touch screen and a peripheral area, wherein the peripheral area is positioned on one side of the touch screen;

a first conductive layer disposed on the substrate, wherein the first conductive layer has a plurality of first touch electrodes and a plurality of dummy electrodes, the first touch electrodes and the dummy electrodes are located in the touch area and structurally separated from each other, the first touch electrodes and the dummy electrodes are arranged in a first direction, and each of the dummy electrodes is disposed between two adjacent ones of the first touch electrodes;

a second conductive layer disposed on the substrate, wherein the second conductive layer has a plurality of second touch electrodes, the second touch electrodes are located in the touch area and are structurally separated from each other, the second touch electrodes are arranged in a second direction, and the first direction and the second direction are staggered;

an insulating layer disposed between the first conductive layer and the second conductive layer to electrically isolate the first touch electrodes from the second touch electrodes, wherein the insulating layer has a plurality of contact windows;

a plurality of first bonding pads disposed on the peripheral region of the substrate, wherein the first touch electrodes are electrically connected to the first bonding pads; and

and a plurality of second bonding pads disposed on the peripheral region of the substrate, wherein the second touch electrodes of the second conductive layer are electrically connected to the dummy electrodes of the first conductive layer through the contact windows of the insulating layer, and the dummy electrodes are electrically connected to the second bonding pads.

2. The touch panel of claim 1, wherein a dummy electrode has a first portion and a second portion, the first portion and the second portion are arranged in the second direction, the first portion overlaps at least one of the contact holes of the insulating layer and is electrically connected to a second bonding pad, the second portion crosses at least one of the second touch electrodes, and the first portion and the second portion are disconnected.

3. The touch panel as recited in claim 1, wherein the first conductive layer and the second conductive layer have a plurality of repeating structures arranged in an array in the touch area, a portion of the first conductive layer of a repeating structure and a portion of the second conductive layer of the repeating structure have a coupling capacitance Cm, and Cm is less than or equal to 1.5 pF.

4. The touch panel of claim 1, wherein each of the first touch electrodes has a first side and a second side opposite to each other, the plurality of dummy electrodes includes a plurality of first dummy electrodes and a plurality of second dummy electrodes, the plurality of first dummy electrodes are structurally separated from the plurality of second dummy electrodes, the plurality of first dummy electrodes are disposed on the plurality of first sides of the plurality of first touch electrodes, the plurality of second dummy electrodes are disposed on the plurality of second sides of the plurality of first touch electrodes, and a second touch electrode is electrically connected to a first dummy electrode and a second dummy electrode on the first side and the second side of the same first touch electrode.

5. The touch panel of claim 4, wherein the plurality of virtual electrode sets comprises the first virtual electrodes and the second virtual electrodes, each of the virtual electrode sets comprises a first virtual electrode and a second virtual electrode respectively located on the first side and the second side of the same first touch electrode; the touch area comprises a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each second touch electrode is provided with a first part and a second part which are respectively positioned in the first sub-touch area and the second sub-touch area; the first portion and the second portion of the second touch electrode are electrically connected to the different virtual electrode groups respectively.

6. The touch panel of claim 1, wherein each of the first touch electrodes has a first side and a second side opposite to each other, and the dummy electrodes are disposed on a plurality of first sides of the first touch electrodes.

7. The touch panel of claim 1, wherein each of the first touch electrodes has a first side and a second side opposite to each other, the plurality of dummy electrodes comprises a plurality of first dummy electrodes disposed on the first sides of the plurality of first touch electrodes and a plurality of second dummy electrodes disposed on the second sides of the plurality of first touch electrodes; the touch area comprises a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each second touch electrode is provided with a first part and a second part which are respectively positioned in the first sub-touch area and the second sub-touch area; the first portion and the second portion of the second touch electrode are electrically connected to the first virtual electrode and the second virtual electrode, respectively, and at least one first touch electrode of the first touch electrodes is disposed between the first virtual electrode and the second virtual electrode.

8. The touch panel of claim 1, wherein the touch area comprises a first sub-touch area and a second sub-touch area outside the first sub-touch area, and each of the second touch electrodes comprises a first portion and a second portion respectively located in the first sub-touch area and the second sub-touch area; the first portion and the second portion of the second touch electrode are structurally separated and electrically connected to the different virtual electrodes respectively.