CN108228002A - Touch panel and apply its touch control display apparatus - Google Patents

Abstract

A touch panel, which defines a touch area and a non-touch area surrounding the touch area, the touch panel includes a substrate, a plurality of first touch electrodes, an insulating layer, and a plurality of layers sequentially stacked on the substrate. a second touch electrode, the plurality of first touch electrodes and the plurality of second touch electrodes are located in the touch area, and the touch panel also includes a plurality of first touch electrodes located in the non-touch area wires and multiple second wires, the multiple first wires are connected to the first touch electrodes, the multiple second wires are connected to the second touch electrodes, and the non-touch area is provided with The bonding area is used to connect the wires to the control circuit. The bonding area is provided with a plurality of connection pads connected to the wires. The second touch electrode is extended in the non-touch area to form a plurality of extended wires. The wire extends to the binding region and overlaps a connection pad. The design of the present invention ensures the electrical connection between the second touch electrode and the control circuit, effectively improving the touch sensing effect.

Description

Touch panel and touch display device using same

technical field

The invention relates to a touch panel and a touch display device using the same.

Background technique

In the prior art, a touch panel usually includes a substrate, a plurality of touch drive (Tx) electrodes stacked on the surface of the substrate in sequence, an insulating layer and a plurality of touch sensing (Rx) electrodes, wherein the insulating layer is stacked on the surface of the substrate. Between the plurality of Tx electrodes and the plurality of Rx electrodes, a plurality of metal leads electrically connected to the Tx touch electrodes and the Rx electrodes are further arranged on the substrate. Wherein the touch panel can be divided into a display touch area and a peripheral circuit area, the plurality of Tx electrodes and a plurality of Rx electrodes are arranged in the display touch area, and the plurality of metal leads are arranged in the peripheral circuit area, each The metal leads are electrically connected to the corresponding touch electrodes.

However, when the thickness of the insulating layer is large, and the slope of the outer edge of the insulating layer relative to the surface of the substrate is relatively large, the Rx electrodes formed on the insulating layer overlap the metal leads of the non-touch area. When connecting, it is easy to cause broken wires and other poor laps, which will affect the operation of the touch panel.

Contents of the invention

In view of this, it is necessary to provide a touch panel, the touch electrodes of which have good electrical connection with peripheral circuits.

A touch panel, which defines a touch area and a non-touch area surrounding the touch area, the touch panel includes a substrate, a plurality of first touch electrodes, an insulating layer, and a plurality of layers sequentially stacked on the substrate. a plurality of second touch electrodes, the plurality of first touch electrodes and the plurality of second touch electrodes are located in the touch area, and the touch panel also includes a set on the substrate and located in the non-touch area multiple first wires and multiple second wires, the multiple first wires are connected to the first touch electrodes, the multiple second wires are connected to the second touch electrodes, and the non- The touch area is provided with a binding area so that the plurality of first wirings and the plurality of second wirings are connected to the control circuit, and the binding area is provided with the plurality of first wirings and the plurality of second wirings. A plurality of connecting pads connected to the second wiring are respectively connected to the control circuit, the second touch electrode is extended in the non-touch area to form a plurality of extended wiring, and each extended wiring extends to the bonding area and Overlap a connection pad.

Further, an anisotropic conductive film is provided on the surface of the extended trace away from the connection pad, and the anisotropic conductive film is located between the control circuit and the extended trace so that the control circuit communicates with all Extended traces described above.

Further, the insulating layer covers the multiple first wires and the multiple second wires in the touch area and the non-touch area, but does not cover the binding area.

Further, the diameter of the conductive particles contained in the anisotropic conductive film is larger than the thickness of the insulating layer.

Further, the plurality of first touch electrodes are arranged in multiple rows extending along the first direction, and every two adjacent first touch electrodes in each row are electrically connected, so that the first touch electrodes of each row The control electrodes form a first touch electrode string, and the first touch electrodes in different rows are electrically insulated from each other; the plurality of second touch electrodes are arranged in a plurality of columns extending along the second direction, and in each column Every two adjacent second touch electrodes are electrically connected, so that the second touch electrodes in each column form a second touch electrode string, and the second touch electrodes in different columns are electrically insulated from each other.

Further, one end of each first trace is connected to a first touch electrode string, and the other end is connected to a connection pad in the binding area; one end of each second trace is connected to a second touch electrode string, and the other end is connected to a set A connection pad in the binding region.

Further, the touch panel further includes a plurality of dummy electrodes arranged on the insulating layer, the plurality of dummy electrodes are arranged in the gap between two adjacent second touch electrode strings, the plurality of dummy electrodes The dummy electrodes are not connected to each other, and the dummy electrodes are not connected to any wiring.

Further, there is a one-to-one correspondence between the plurality of dummy electrodes and the first touch electrodes, and the projection of each dummy electrode on the substrate overlaps with one first touch electrode.

Further, the second touch electrode and the plurality of extended wires are formed by patterning the same conductive material layer.

In addition, it is also necessary to provide a touch display device, which includes a display panel and the above-mentioned touch panel disposed on the display panel.

On the basis of the prior art, the present invention extends the second touch electrode to form an extended wiring to connect with the metal connection pad in the bonding area, so that even if the thickness of the insulating layer is relatively large, the second touch electrode can be guaranteed The electrical connection with peripheral circuits (such as control circuits) effectively improves the touch sensing effect.

Description of drawings

FIG. 1 is a schematic top view of a touch panel according to a preferred embodiment of the present invention.

FIG. 2 is a schematic plan view of the touch panel in a preferred embodiment of the present invention after removing the layer of the second touch electrode.

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

FIG. 4 is a schematic cross-sectional view taken along the section line IV-IV in FIG. 1 .

FIG. 5 is a schematic cross-sectional view of a touch display device according to a preferred embodiment of the present invention.

Description of main component symbols

touch panel 100 Substrate 10 touch area 101 Non-touch area 103 Binding region 105 first touch electrode 20 first connection 201 second touch electrode 30 second connection 301 Insulation 40 The first touch electrode string twenty one The second touch electrode string 31 First trace 51 second trace 52 contact pad 53 connection pad 54 FPC 60 dummy electrode 70 Extension trace 33 Anisotropic Conductive Film 80 touch display device 200 display panel 210

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described in conjunction with the above drawings.

Detailed ways

The drawings illustrate embodiments of the invention, which may be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete, and the scope of the present invention will be fully understood by those skilled in the art. In the drawings, the dimensions of layers and regions are exaggerated for clarity.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited to these the term. These terms are only used to distinguish an element, component, region, layer and/or section from another element, component, region, layer and/or section. Thus, a first element, component, region, layer and/or section discussed below could be termed a second element, component, region, layer and/or section without departing from the teachings of the present invention.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. As used herein, the singular forms "a", "an" and "the" are intended to cover the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that when the terms "comprises" and "comprises" are used in the specification, the existence of said features, integers, steps, operations, elements and/or components is indicated, but one or more other features, integers, or components are not excluded. , steps, operations, elements and/or components exist.

Embodiments of the invention are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate constructions) of the invention. As such, variations in the shapes of the illustrations as a result of manufacturing processes and/or tolerances are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. The regions shown in the figures are schematic in themselves and their shapes are not intended to illustrate the actual shape of the device and are not intended to limit the scope of the invention.

Unless otherwise defined, 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 should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted to have a meaning consistent with their meaning in the context of the relevant field, and not to be interpreted in an overly idealistic or overly formal sense , unless explicitly defined in this text.

Referring to FIGS. 1-2 , a touch panel 100 according to a preferred embodiment of the present invention defines a touch area 101 and a non-touch area 103 surrounding the touch area 101 . Please refer to FIG. 3 , the touch panel 100 includes a substrate 10 formed on a surface of the substrate 10 with a plurality of first touch electrodes 20 formed on the substrate 10 and covering the plurality of first touch electrodes. An insulating layer 40 of 20 and a plurality of second touch electrodes 30 formed on the insulating layer 40 . The plurality of first touch electrodes 20 and the plurality of second touch electrodes 30 are insulated from each other by the insulating layer 40 .

It can be understood that the materials of the plurality of first touch electrodes 20 and the plurality of second touch electrodes 30 can be various transparent and conductive materials conventionally used in this field, such as indium tin oxide, metal mesh, etc. Lattice, silver nanowires, carbon nanotubes, etc.

1 is a schematic top view of a touch panel 100 having a layer where the second touch electrodes 30 are located, and FIG. 2 is a schematic top view of the touch panel 100 having a layer where the first touch electrodes 20 are located. As shown in FIG. 2, the plurality of first touch electrodes 20 are arranged in multiple rows extending along the first direction (D1 direction in FIG. 2), and each row includes a plurality of first touch electrodes arranged at intervals. For the electrodes 20, every two adjacent first touch electrodes 20 in each row are electrically connected through a first connection portion 201, so that the first touch electrodes 20 in each row form a first touch electrode string 21, different The first touch electrodes 20 in a row are electrically insulated from each other. The first connecting portion 201 and the first touch electrode 20 are formed on the same surface of the substrate 10 and can be formed by patterning the same conductive material layer. As shown in FIG. 1, the plurality of second touch electrodes 30 are arranged in multiple columns extending along the second direction (D2 direction in FIG. 1), and each column includes a plurality of second touch electrodes arranged at intervals. For the electrodes 30, every two adjacent second touch electrodes 30 in each row are electrically connected through a second connection portion 301, so that the second touch electrodes 30 in each row form a second touch electrode string 31, different The second touch electrodes 30 in a column are electrically insulated from each other. The second connecting portion 301 and the second touch electrode 30 can be formed by patterning the same conductive material layer. The second direction intersects the first direction. In this embodiment, the second direction intersects the first direction perpendicularly. In this embodiment, the first touch electrodes 20 are touch driving (Tx) electrodes, and the second touch electrodes 30 are touch sensing (Rx) electrodes. It can be understood that, in other embodiments, it may also be set that the first touch electrodes 20 are Rx electrodes, and the second touch electrodes 30 are Tx electrodes.

As shown in FIG. 1 and FIG. 2 , the touch panel 100 further includes a plurality of wires electrically connected to the first touch electrode string 21 and the second touch electrode string 31 respectively. The plurality of wires are arranged in the non-touch area 103 . In this embodiment, among the plurality of traces, the traces connected to the first touch electrode series 21 are defined as the first traces 51, and the traces connected to the second touch electrode strings 31 are defined as the second traces 52. The non-touch area 103 also includes a binding area 105 . The plurality of wires extend to the bonding area 105 to be electrically connected to the control circuit (such as the FPC 60 in this embodiment). As shown in FIG. 2 , one end of each first trace 51 is connected to a contact pad 53 , and the other end is connected to a connection pad 54 , and each first trace 51 is connected to a first touch electrode series 21 through the contact pad 53 . The connection pad 54 is disposed on the binding area 105 to communicate with the FPC 60 through the connection pad 54 . The first touch electrode series 21 is disposed in the touch area 101 . As shown in FIGS. 1 and 2, the plurality of wirings (including the first wiring 51 and the second wiring 52) are directly arranged on the substrate 10 and covered by the insulating layer 40, wherein the area covered by the insulating layer 40 is The area surrounded by the largest dashed box in Figures 1 and 2. As shown in FIG. 1 , one end of each second wire 52 is directly connected to the second touch electrode string 31 , and the other end is connected to the connection pad 54 disposed in the bonding area 105 . The second wiring 52 penetrates through the insulating layer 40 to be electrically connected to the second touch electrode string 31 . In this embodiment, the end of the second wire 52 connected to the second touch electrode string 31 is not provided with a contact pad 53 like the first wire 51 . The contact pads 53 and the connection pads 54 are directly disposed on the substrate 10 and located in the non-touch area 103 . In addition, the material of the first trace 51 , the second trace 52 , the contact pad 53 , and the connection pad 54 can be various conductive metals or alloys conventionally used in the field.

As shown in FIG. 1 and FIG. 2 , in this embodiment, each first touch electrode 20 and each second touch electrode 30 are rhombus-shaped, and the first touch electrode 20 and the second touch electrode 20 at the outermost The electrodes 30 may not be diamond-shaped. As shown in FIG. 1 , since there is a gap between two adjacent second touch electrode strings 31 , the light incident from one side of the touch panel 100 passes through the conductor where the second touch electrode 30 is located. Differences occur after layering, thereby affecting the overall display effect; therefore, in this embodiment, a plurality of dummy electrodes 70 are also arranged on the insulating layer 40, and the plurality of dummy electrodes 70 are arranged on two adjacent second touch points. The gap between the electrode strings 31. The dummy electrodes 70 and the second touch electrodes 30 are arranged in the same layer, that is, formed by patterning the same conductive material layer. As shown in FIG. 1 , each dummy electrode 70 is rhombus-shaped, and the dummy electrodes 70 are not connected to each other, but are insulated from each other, and the dummy electrodes 70 are not connected to any wiring. In this embodiment, the plurality of dummy electrodes 70 can be arranged in a one-to-one correspondence with the first touch electrodes 20 , and the projection of each dummy electrode 70 on the substrate 10 corresponds to one first touch electrode 20 . overlapping, as shown in Figure 3.

Through the arrangement of the dummy electrodes 70, the light incident from one side of the touch panel 100 will not produce obvious differences after passing through the conductive layer where the second touch electrodes 30 are located, thereby ensuring the uniformity of the overall display effect. . However, after the dummy electrodes 70 are set, the dummy electrodes 70 will cause some interference to the first touch electrodes 20, and in order to avoid such interference, it is necessary to increase the insulating layer 40 between the dummy electrodes 70 and the first touch electrodes 20. thickness (increase the distance between the dummy electrode 70 and the first touch electrode 20). However, the increase in the thickness of the insulating layer 40 will result in a larger slope (the angle between the outer edge of the insulating layer 40 and the surface of the substrate 10 ), so that the second touch electrode 30 is prone to breakage when the outer edge of the insulating layer 40 overlaps. Poor splicing of wires, etc.

In order to solve the above problems, as shown in FIG. 1, the conductive layer where the second touch electrode 30 is located is not only arranged in the touch area 101, but also further extends in the non-touch area 103 until it reaches the binding area 105, defined The part of the second touch electrode 30 extending to the non-touch area 103 is an extension trace 33 . Each second touch electrode string 31 is connected with an extension trace 33 extending therefrom and located in the non-touch area 103 . The second touch electrode series 31 and the extension wiring 33 are arranged on the same layer, that is, the same conductive material layer is patterned and formed at the same time. The extension wire 33 extends in the non-touch area 103 and reaches the bonding area 105 , and covers the connection pad 54 connected to the second wire 52 in the bonding area 105 . Since both the second wiring 52 and the extension wiring 33 are extended and connected to the connection pad 54 in the bonding area 105, in order to prevent the second wiring 52 and the extension wiring 33 from being electrically connected in the non-bonding area, as shown in FIG. 1 and 2, the insulating layer 40 covers the touch area 101 and the non-touch area 103, but does not cover the binding area 105, so as to insulate the second wiring 52 and the extension wiring 33 from each other.

As shown in the cross-sectional view of the binding area 105 in FIG. The line 33 climbs along the inclination of the insulating layer 40 until it covers the area of the connection pad 54 not covered by the insulating layer 40 . An anisotropic conductive film 80 is also disposed on the connection pad 54 , and the connection pad 54 is electrically connected to the FPC 60 through the anisotropic conductive film 80 . Specifically, the anisotropic conductive film 80 is located on the surface of the extended wiring 33 away from the connection pad 54, and the anisotropic conductive film 80 is located between the FPC 60 and the extended wiring. Between 33.

In this embodiment, the material of the insulating layer 40 is a transparent non-conductive material, and its thickness is set to be greater than or equal to 5 microns. The thickness of the anisotropic conductive film 80 is greater than the thickness of the insulating layer 40, and the diameter of the conductive particles contained in the anisotropic conductive film 80 is greater than the thickness of the insulating layer 40, for example, the thickness of the insulating layer 40 is 10 microns, the diameter of the conductive particles contained in the anisotropic conductive film 80 is greater than 10 microns. In this way, when the extension wiring 33 climbs along the inclination angle of the insulating layer 40 and has poor lap connection such as disconnection, the electrical signal of the FPC 60 can pass through the anisotropic conductive film 80, the extension wiring 33, and the connection pad. 54 . The second wiring 52 reaches the second touch electrode series 31 . And if the extended wiring 33 is well lapped along the slope of the insulating layer 40, the electrical signal of the FPC 60 can reach the second contact via the anisotropic conductive film 80 and the extended wiring 33. Control electrode string 31.

On the basis of the prior art, the present invention extends the second touch electrode 30 to form an extension wire 33 and connects the metal connection pad 54 of the binding area 105, which can ensure the connection between the second touch electrode 30 and the control circuit. The electrical connection effectively improves the touch sensing effect.

It can be understood that the shapes of the first touch electrodes 20 and each of the second touch electrodes 30 are not limited to rhombus, and can also be various shapes conventionally used in the field, such as rectangle, elongated and so on.

It can be understood that the shape of the dummy electrodes 70 is not limited to a rhombus, and can also be various shapes conventionally used in this field, as long as the gaps between adjacent touch electrode strings can be filled.

Please refer to the touch display device 200 shown in FIG. 5 , the touch display device 200 includes a display panel 210 and the above-mentioned touch panel 100 disposed on the display panel 210 . The touch display device 200 can be a mobile phone, a tablet computer, a notebook computer, and the like. The display panel 210 can be a liquid crystal display panel, an OLED display panel, a micro-LED display panel, etc. In this embodiment, the display panel 210 is a liquid crystal display panel.

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. The up, down, left and right directions appearing in the illustrations are only for the convenience of understanding. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art Those of ordinary skill 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 solutions of the present invention.

Claims (10)

1. a kind of touch panel, definition has Touch Zone and the non-touch area around Touch Zone, and the touch panel includes substrate And multiple first touch control electrodes, insulating layer and multiple second touch control electrodes on substrate are sequentially laminated on, the multiple One touch control electrode and the multiple second touch control electrode are located at the Touch Zone, and the touch panel, which further includes, to be disposed on the substrate And a plurality of first cabling positioned at non-touch area and a plurality of second cabling, a plurality of first cabling and the first touch control electrode connect It connects, a plurality of second cabling is connect with second touch control electrode, and the non-touch area is provided with binding area so that described a plurality of the One cabling connects control circuit with a plurality of second cabling, and binding area is provided with and a plurality of first cabling and described a plurality of Multiple connection gaskets that second cabling connects respectively with control circuit to connect, it is characterised in that：The second touch control electrode is non- Touch Zone extends to form a plurality of extension cabling, and each extension cabling extends to the binding area and covers one connection of overlap joint Pad.

2. touch panel as described in claim 1, which is characterized in that on the surface of the extension cabling far from the connection gasket Anisotropic conductive film is provided with, the anisotropic conductive film is located between the control circuit and the extension cabling so that control Extend cabling described in circuit communication.

3. touch panel as claimed in claim 2, which is characterized in that the insulating layer covers the Touch Zone and non-touch area A plurality of first cabling and a plurality of second cabling, but do not cover binding area.

4. touch panel as claimed in claim 3, which is characterized in that the conducting particles contained in the anisotropic conductive film Diameter is more than the thickness of the insulating layer.

5. touch panel as described in claim 1, which is characterized in that the multiple first touch control electrode is arranged into along first party To the multirow of extension, make the first touch-control electricity of every a line to be electrically connected per two adjacent the first touch control electrodes in every a line Pole forms a first touch control electrode string, and the first touch control electrode do not gone together mutually is electrically insulated；The multiple second touches Electrode arrangements are controlled into the multiple row extended in a second direction, per two adjacent second touch control electrodes to be electrically connected in each row, The second touch control electrode of each row is made to form a second touch control electrode string, the second touch control electrode of different lines is mutually electrically exhausted Edge.

6. touch panel as claimed in claim 5, which is characterized in that the first cabling of each one end connects first touch-control Electrode array, the other end connect and bind a connection gasket in area, and the second cabling of each one end connects a second touch control electrode string, Other end connection is arranged on a connection gasket in binding area.

7. touch panel as claimed in claim 5, which is characterized in that the touch panel, which further includes, is arranged on the insulating layer On multiple dummy electrodes, the multiple dummy electrode is arranged on the gap between two adjacent second touch control electrode strings, institute It states multiple dummy electrodes not connect between each other, and the dummy electrode is not also connect with any cabling.

8. touch panel as claimed in claim 7, which is characterized in that the multiple dummy electrode and the first touch control electrode are one One-to-one correspondence, projection of each dummy electrode on substrate overlap with first touch control electrode.

9. touch panel as described in claim 1, which is characterized in that the second touch control electrode and a plurality of extension cabling It is formed by same conductive material pattern layers.

10. a kind of touch control display apparatus, described including touch panel display panel and setting on said display panel Touch panel is the touch panel described in any one in claim 1-9.