TWM512746U - Touch panels - Google Patents

Abstract

A touch panel is provided. The display panel includes a first touch electrode insulated from and intersecting a second touch electrode. The first touch electrode and the second touch electrode are disposed in a touch area. A first trace is disposed at a peripheral area which is located at one side of the touch area, and the first trace electrically connects the first touch electrode to a first pad. A second trace is disposed at the touch area and extends to the peripheral area. The second trace electrically connects the second touch electrode to a second pad. The first trace and the second trace located at the peripheral area are disposed on a single side of the touch area.

Description

Touch panel

The present invention relates to a touch panel, and more particularly to a frameless touch panel structure.

In recent years, touch panels have been widely used in various electronic products, such as mobile phones, portable computers, and palm-sized computers. Touch panels are often combined with display panels to become input/output interfaces for electronic products.

At present, a more common touch panel generally includes a touch area and a light-shielding area surrounding the touch area. The touch area is used to generate an inductive signal, and a plurality of peripheral leads are disposed in the shading area for The sensing signal is transmitted to the signal processor for calculation, thereby determining the coordinates of the touch position.

Taking FIG. 3 as an example, FIG. 3 shows a schematic plan view of a conventional touch panel. The touch panel 300 includes a touch area 302 and a light blocking area 306 surrounding the touch area 302. A conductive sensing pattern 304 is formed on the touch area 302 of the touch panel 300. The conductive sensing pattern 304 includes a plurality of horizontal (X-direction) first sensing electrodes 304a and a plurality of longitudinal (Y-direction) second sensing electrodes. 304b. A conductive line pattern 308 is formed on the light-shielding region 306 of the touch panel 300 to be electrically connected to the conductive sensing pattern 304 of the touch area 302. The bonding pad at the end of the conductive line pattern 308 is electrically coupled to an FPC to sense Inductive signal generated by the electrode Passed to the processor (not shown).

However, in the above prior art, because of the design of the conductive sensing pattern 304 and the routing manner of the conductive line pattern 308, the conductive line pattern 308 is at least from the left side of the touch area 302 and the lateral first sensing electrode 304a. The electrical connection is electrically connected to the longitudinal second sensing electrode 304b from below the touch area 302. Under this design scheme, space is reserved for the conductive line pattern 308 under the touch panel and the left side light shielding area 306, and in some touch panels, in order to make the touch area not offset from the central position Too much, so although there is no need to arrange the conductive line pattern 308 in the light-shielding area above or on the right side of the touch panel, space needs to be reserved for balancing the position of the touch area.

Even if the conductive line patterns 308 are electrically connected to the different first sensing electrodes 304a from the left and right sides of the touch area 302, and then the signals are collected under the touch area, the side frames can be reduced. Size, but the left and right borders still occupy a certain amount of space on the touch panel, and if the touch panel is applied to a large-sized or high-resolution fingerprint recognition touch panel, the wires connecting the touch electrodes will require larger sides. The invalid touch space of the border cannot reach the narrow side border or the left and right borderless touch panels.

Therefore, the current industry still needs to improve the conductive patterns of the existing touch panels, in order to save more conductive wiring space and achieve the maximum effect of the touch area.

The touch panel provided by the present invention is designed by using an electrical connection structure between the transmission line and the touch electrode, so that the transmission lines of the light shielding area are all disposed in the touch area. Single side, reaching the left and right borderless touch panel.

Some embodiments of the present invention provide a touch panel, including: a first touch electrode and a second touch electrode, which are insulatively arranged in a touch area; and a first transmission line disposed on a side of the touch area a light shielding area, and electrically connecting the first touch electrode to the first pad also located in the light shielding area; and the second transmission line electrically connecting the second touch electrode to the second pad also located in the light shielding area And extending from the touch area to the light shielding area, wherein the first transmission line and the second transmission line located in the light shielding area are disposed on a single side of the touch area.

100, 200, 300‧‧‧ touch panels

101‧‧‧Substrate

102a‧‧‧First touch electrode

102b‧‧‧second touch electrode

103a‧‧‧First transmission line

103b, 203‧‧‧ second transmission line

104a‧‧‧First mat

104b‧‧‧second mat

105‧‧‧First insulation

106‧‧‧Protective layer

107‧‧‧First via

108‧‧‧Second via

110, 302‧‧‧ touch area

120, 306‧‧‧ shading area

205‧‧‧Second insulation

304‧‧‧ Conductive sensing graphics

304a‧‧‧first sensing electrode

304b‧‧‧second sensing electrode

308‧‧‧ conductive circuit graphics

A‧‧‧first width

B‧‧‧second width

D1, d2‧‧‧ distance

D, E‧‧‧ finger pressing area

F‧‧‧Dummy coil selection

W1‧‧‧Width

FIG. 1A shows a plan view of a touch panel in accordance with some embodiments of the present author.

Fig. 1B is a partial cross-sectional view showing a section line A-A' of Fig. 1A.

Fig. 1C is a partial cross-sectional view showing a section line B-B' of Fig. 1A.

Fig. 1D is a partial cross-sectional view showing a section line C-C' of Fig. 1A.

FIG. 2A shows a plan view of a touch panel in accordance with some other embodiments of the present invention.

Fig. 2B is a partial cross-sectional view showing a section line A-A' of Fig. 2A.

Fig. 2C is a partial cross-sectional view showing a section line B-B' of Fig. 2A.

Fig. 2D is a partial cross-sectional view showing a section line C-C' of Fig. 2A.

Fig. 2E is a plan enlarged view showing the dotted circle selection area F of Fig. 2A.

Figure 3 shows a schematic plan view of a conventional touch panel.

Please refer to FIG. 1A, which shows a schematic plan view of a touch panel 100 according to some embodiments of the present invention. The touch panel 100 includes a substrate 101. In some embodiments, the material of the substrate 101 may include glass, polyethylene terephthalate (PET) or polyimide (PI).

In some embodiments, the first touch electrodes 102a and the second touch electrodes 102b are alternately disposed on the touch panel 110 and formed on the substrate 101. The second touch electrodes 102b include a plurality of strips along the first direction. (for example, an X-axis direction) an axial electrode extending and parallel to each other, the first touch electrode 102a includes a plurality of axial electrodes extending in a second direction (for example, a Y-axis direction) and parallel to each other, and the second direction Vertical to the first direction. In some embodiments, the first touch electrode 102a can be a receiving electrode, and the second touch electrode 102b can be a driving electrode. In other embodiments, the first touch electrode 102a can be a driving electrode, and the second touch electrode 102b is a receiving electrode. The material of the first touch electrode 102a and the second touch electrode 102b may comprise a transparent conductive material, such as indium tin oxide (ITO), indium zinc oxide (IZO), fluorine-doped tin oxide. (fluorine doped tin oxide, FTO), aluminum doped zinc oxide (AZO), gallium doped zinc oxide (GZO), metal mesh, silver nano -wire, SNW) and so on.

The first transmission line 103a is disposed in the light shielding area 120, and the first touch electrode 102a is electrically connected to the first pad 104a, and the first transmission line 103a and the first pad 104a are located only on a single side of the touch area 110, in other words, The first end of the first touch electrode 102a electrically connected to the first transmission line 103a is located at the first pad 104a. The same side of the touch area 110. The material of the first transmission line 103a and the first connection pad 104a may include a metal material such as molybdenum, aluminum, and alloys thereof. As shown in FIG. 1A, the second transmission line 103b is disposed in the touch area 110 and extends from the touch area 110 to the light shielding area 120. The second transmission line 103b electrically connects the second touch electrode 102b to the light shielding area 120. The second pad 104b, according to some embodiments of the present invention, the first transmission line 103a, the first pad 104a and the second pad 104b located in the light shielding area 120 are disposed only on a single side of the touch area 110, and second The transmission line 103b is also disposed on the same single side of the touch area 110 in the light-shielding area 120, so that the left and right sides of the touch area 110 of the touch panel 100 are not provided with a transmission line, thereby achieving a touch panel structure with no left and right borders. It is applied to large-size and high-resolution fingerprint recognition touch panels.

In some embodiments, the first transmission line 103a and the second transmission line 103b include a plurality of wires extending in a second direction (eg, the Y-axis direction) and parallel to each other, and each of the wires of the second transmission line 103b is electrically connected via the via hole 107. Connected to one of the axial electrodes of the second touch electrode 102b, and at least one of the wires of the second transmission line 103b is insulated from the remaining at least one axial electrode of the second touch electrode 102b that is not electrically connected. In some embodiments, the material of the first transmission line 103a and the second transmission line 103b may comprise a metal mesh, a nano silver wire or a transparent conductive material, such as indium tin oxide, indium zinc oxide, fluorine-doped tin oxide, aluminum doped Zinc oxide, gallium-doped zinc oxide, etc.

Please refer to FIG. 1B to FIG. 1C , which respectively show a partial cross-sectional view along a section line AA′ and a section line BB′ of FIG. 1A , and the touch panel 100 includes a first insulating layer 105 disposed on the first touch. Between the control electrode 102a and the second touch electrode 102b, the second transmission line 103b is located above the second touch electrode 102b and is first The touch electrode 102a is located in the same layer structure, and the second transmission line 103b is electrically connected to the second touch electrode 102b via the first via hole 107 in the first insulating layer 105, so that one axis of the second touch electrode 102b The electrode is allowed to transmit a signal through a second transmission line 103b. In this embodiment, a second transmission line 103b is formed between two adjacent axial electrodes of the first touch electrode 102a, such that an axial electrode of the first touch electrode 102a forms an interaction interval with the second transmission line 103b. Arrangement, of course, in other embodiments, a plurality of second transmission lines 103b may be formed between two adjacent axial electrodes of the first touch electrode 102a. In some embodiments, the first insulating layer 105 has a thickness of 2 μm to 5 μm, and the material of the first insulating layer 105 may include an epoxy resin, an inorganic material (for example, hafnium oxide, tantalum nitride, hafnium oxynitride or a combination thereof). ), organic polymer materials (for example, polyimide, butylcyclobutene (BCB), parylene, polynaphthalenes, fluorocarbons, Acrylates or other suitable insulating materials.

In addition, the touch panel 100 further includes a protective layer 106 covering the first touch electrode 102a and the second transmission line 103b. In some embodiments, the protective layer 106 has a thickness of 2 μm to 5 μm, and the material of the protective layer 106 may include an epoxy resin, an inorganic material (for example, hafnium oxide, tantalum nitride, hafnium oxynitride or a combination thereof), and the organic layer is high. Molecular materials (eg, polyimine resin, benzocyclobutene, parylene, naphthalene polymer, fluorocarbon, acrylate) or other suitable materials.

Regarding the manufacturing method of the touch panel 100, as shown in FIGS. 1B to 1C, in some embodiments, the substrate 101 is provided through a deposition process (for example, a physical vapor deposition process, a chemical vapor deposition process, or other suitable process). ), lithography process and etching process (eg, dry etching process, wet etching process, electrical plasma etching) The second touch electrode 102b is formed on the substrate 101 by an engraving process, a reactive ion etching process or other suitable process, and then can be subjected to a deposition process (for example, a physical vapor deposition process, a chemical vapor deposition process, or other suitable process). The first insulating layer 105 is formed on the second touch electrode 102b, and the first insulating layer 105 covers the second touch electrode 102b and the substrate 101.

Then, the holes of the plurality of first via holes 107 are formed in the first insulating layer 105 through the laser drilling process, wherein the holes of each of the first via holes 107 correspond to an axial direction of the second touch electrode 102b. An electrode, and a hole of the first via hole 107 penetrates through the first insulating layer 105 to expose a portion of the second touch electrode 102b. The deposition process (eg, physical vapor deposition process, chemical vapor deposition process, or other suitable process), lithography process, and etching process (eg, dry etch process, wet etch process, plasma etch process, reactivity) can be performed. The ion transmission process or other suitable process forms the second transmission line 103b on the first insulating layer 105, and the conductive material of the second transmission line 103b is filled in the hole of the first insulating layer 105 to form the first via hole 107.

Then, through a deposition process (eg, physical vapor deposition process, chemical vapor deposition process or other suitable process), lithography process and etching process (eg, dry etching process, wet etching process, plasma etching process, reaction) The ion etch process or other suitable process forms the first touch electrode 102a on the first insulating layer 105. In this embodiment, two adjacent axial electrodes of the first touch electrode 102a are respectively formed on the left and right sides of the second transmission line 103b, so that the axial electrodes of the first touch electrode 102a interact with the second transmission line 103b. Arranged at intervals.

Then, through a deposition process (eg, physical vapor deposition process, a chemical vapor deposition process or other suitable process), a lithography process, and an etch process (eg, a dry etch process, a wet etch process, a plasma etch process, a reactive ion etch process, or other suitable process) to form the protective layer 106 On the first touch electrode 102a, the protective layer 106 covers the first touch electrode 102a and the second transmission line 103b.

In some embodiments, when the materials of the first touch electrodes 102a and the second transmission lines 103b are the same, the first touch electrodes 102a and the second transmission lines 103b may be simultaneously formed on the first insulating layer 105 to reduce the process steps. In some other embodiments, the first touch electrode 102a and the second transmission line 103b may also be completed in different process steps, respectively, and the order is not limited.

In other embodiments, the first touch electrode 102a, the second touch electrode 102b, and the second transmission line 103b can also be formed by a screen printing process.

Referring to FIG. 1D, a partial cross-sectional view along the line C-C' of FIG. 1A is shown. Two adjacent axial electrodes of the first touch electrode 102a are respectively disposed on the left and right sides of the second transmission line 103b. . When the finger presses the area D shown in FIG. 1A, a first mutual capacitance value C _m 1 (R _x 1-T _x 4) is generated between the first touch electrode 102a on the left side and the second touch electrode 102b on the lower side. (ie, between the first first touch electrode 102a and the fourth second touch electrode 102b), and the second transmission line 103b and the first touch electrode 102a on the left side also generate a second mutual capacitance value C _m 2 (R _x 1-T _x 1 trace) (that is, between the first first touch electrode 102a and the first second transmission line 103b), since the area of the second transmission line 103b is much smaller than that of the second touch electrode 102b The distance d1 between the second transmission line 103b and the first touch electrode 102a on the left side is greater than the distance d2 between the second touch electrode 102b and the first touch electrode 102a on the left side, so when the finger presses the area D The second mutual capacitance value C _m 2 generated by the first touch electrode 102a and the second transmission line 103b on the left side is much smaller than the first mutual capacitance generated by the first touch electrode 102a on the left side and the second touch electrode 102b on the lower side. The value C _m 1, that is, the touch panel 100 senses the mutual capacitance generated by the first touch electrode 102a and the second touch electrode 102b on the left side. Value, so there is no touch misjudgment.

According to the above embodiment of the present invention, the second transmission line 103b is disposed in the touch area 110, electrically connected to the second touch electrode 102b via the first via hole 107, and extends from the touch area 110 to the light shielding area 120. The second touch electrode 102b is electrically connected to the second pad 104b, so that the first transmission line 103a and the second transmission line 103b located in the light shielding area 120 are all disposed on a single side of the touch area 110, so that the touch area is The first three transmission lines 103a and the second transmission line 103b are not present on the remaining three sides of the 110, and the touch panel 100 can be configured to have a left or right narrow border or a borderless structure.

In some embodiments, the material of the first transmission line 103a and the second transmission line 103b may comprise a metal mesh, a nano silver wire or a transparent conductive material, such as indium tin oxide, indium zinc oxide, fluorine-doped tin oxide, aluminum doped The zinc oxide and the gallium-doped zinc oxide can reduce the pattern visibility of the first transmission line 103a and the second transmission line 103b in the touch area 110.

Referring to FIG. 2A, there is shown a touch panel 200 according to some other embodiments of the present invention, wherein the same components as those in FIG. 1A are denoted by the same reference numerals and the description thereof will be omitted.

The structure of the touch panel 200 in FIG. 2A is similar to the structure of the touch panel 100 in FIG. 1A . The difference is that the second transmission line 203 of the touch panel 200 is disposed under the second touch electrode 102b. First touch electrode 102a Designed for the structure of different layers.

Please refer to FIG. 2B~2C, which respectively show a partial cross-sectional view along the cross-sectional line A-A' and the cross-sectional line B-B' of FIG. 2A. The touch panel 200 further includes a second insulating layer 205 disposed on the second Below the touch electrode 102b, the second transmission line 203 is disposed under the second touch electrode 102b and covered by the second insulating layer 205. The second conductive layer 205 is formed with a second via hole 108, and the second transmission line 203 is connected to the second via 203. The via hole 108 is electrically connected to the second touch electrode 102b. In some embodiments, the second insulating layer 205 has a thickness of 2 μm to 5 μm, and the material of the second insulating layer 205 may include an epoxy resin, an inorganic material (for example, hafnium oxide, tantalum nitride, hafnium oxynitride or a combination thereof). ), an organic polymer material (for example, polyimine resin, benzocyclobutene, parylene, naphthalene polymer, fluorocarbon, acrylate) or other suitable materials.

The touch panel 200 further includes a protective layer 106 covering the first touch electrode 102a and the first insulating layer 105. In some embodiments, the protective layer 106 has a thickness of 2 μm to 5 μm, and the material of the protective layer 106 may include an epoxy resin, an inorganic material (for example, hafnium oxide, tantalum nitride, hafnium oxynitride or a combination thereof), and the organic layer is high. Molecular materials (eg, polyimine resin, benzocyclobutene, parylene, naphthalene polymer, fluorocarbon, acrylate) or other suitable materials.

Regarding the manufacturing method of the touch panel 200, as shown in FIGS. 2B to 2C, in some embodiments, the substrate 101 is provided through a deposition process (for example, a physical vapor deposition process, a chemical vapor deposition process, or other suitable process). a lithography process and an etch process (eg, a dry etch process, a wet etch process, a plasma etch process, a reactive ion etch process, or other suitable process) to form a second transfer line 203 on the substrate 101, followed by a deposition process (for example, physical gas phase A second insulating layer 205 is formed on the substrate 101 by a deposition process, a chemical vapor deposition process, or other suitable process, and the second insulating layer 205 covers the second transmission line 203 and the substrate 101.

Then, a hole of the second via hole 108 can be formed in the second insulating layer 205 through a laser drilling process, and a hole of the second via hole 108 exposes a part of the second transmission line 203, and then can pass through a deposition process (for example, physical Vapor deposition process, chemical vapor deposition process or other suitable process), lithography process and etching process (eg, dry etching process, wet etching process, plasma etching process, reactive ion etching process or other suitable process) The second touch electrode 102b is formed on the second insulating layer 205, and the conductive material of the second touch electrode 102b is filled in the hole of the second insulating layer 205 to form the second via hole 108.

The first insulating layer 105 is formed on the second touch electrode 102b through a deposition process (for example, a physical vapor deposition process, a chemical vapor deposition process, or other suitable process), and the first insulating layer 105 covers the second touch electrode. 102b and a second insulating layer 205.

The first touch electrode 102a can pass through a deposition process (eg, a physical vapor deposition process, a chemical vapor deposition process, or other suitable process), a lithography process, and an etch process (eg, a dry etch process, a wet etch process, a plasma process) An etching process, a reactive ion etching process, or other suitable process is formed on the first insulating layer 105.

Then, through a deposition process (eg, physical vapor deposition process, chemical vapor deposition process or other suitable process), lithography process and etching process (eg, dry etching process, wet etching process, plasma etching process, reaction) a plasma etching process or other suitable process) forming a protective layer 106 on the first touch The protective layer 106 covers the first touch electrode 102a and the first insulating layer 105 on the pole 102a.

In other embodiments, the first touch electrode 102a, the second touch electrode 102b, and the second transmission line 203 can also be formed by a screen printing process.

Please refer to FIG. 2D, which shows a partial cross-sectional view along the line C-C' of FIG. 2A, with a second insulating layer 205 between the second touch electrode 102b and the second transmission line 203 separating the two. .

In some embodiments, when the finger presses the area E shown in FIG. 2A, the area E pressed by the finger includes one axial electrode of the first touch electrode 102a, one axial electrode of the second touch electrode 102b, and A wire of the second transmission line 203 is disposed under the second touch electrode 102b, and has a different layer structure from the first touch electrode 102a, and the second touch electrode 102b can be used as a shielding layer to avoid The first touch electrode 102a senses the second transmission line 203, so that no mutual capacitance value is generated between the first touch electrode 102a and the second transmission line 203. Therefore, when the finger presses the area E, the touch panel 200 senses The mutual capacitance values generated by the touch electrodes 102a and the second touch electrodes 102b are not caused by the misjudgment of the touch.

According to the above embodiment of the present invention, since the second transmission line 203 is disposed under the second touch electrode 102b, the second insulating layer 205 is separated by the second insulating layer 205, and the second touch electrode 102b can be shielded as the shielding layer. The touch electrode 102a interferes with the signal of the second transmission line 203 underneath, and prevents the second transmission line 203 from causing a false alarm point condition. Therefore, the line width of the second transmission line 203 located in the touch area 110 can be increased to reduce the second transmission line 203. The total resistance does not occur in the event of a false alarm. As shown in Fig. 2E, it shows the dotted circle selection portion F of Fig. 2A. Magnified view. In some embodiments, a portion of the second transmission line 203 located in the touch area 110 may have a first width a, a portion of the second transmission line 203 located in the light shielding area 120 may have a second width b, and the first width a is greater than the second width b. In some embodiments, the material of the portion of the second transmission line 203 located in the touch area 110 may include a metal mesh, a nano silver wire, or a transparent conductive material such as indium tin oxide, indium zinc oxide, fluorine doped tin oxide. The aluminum-doped zinc oxide, the gallium-doped zinc oxide, and the material of the portion of the second transmission line 203 located in the light-shielding region 120 may include a metal material such as molybdenum, aluminum, and alloys thereof.

According to the above embodiment of the present invention, the second transmission line 203 is disposed in the touch area 110, electrically connected to the second touch electrode 102b via the second via hole 108, and extends from the touch area 110 to the light shielding area 120. Therefore, the second touch electrode 102b is electrically connected to the second pad 104b, so that the first transmission line 103a and the second transmission line 203 located in the light shielding area 120 are all disposed on a single side of the touch area 110, so that the touch area is The first three transmission lines 103a and the second transmission line 203 are not present on the remaining three sides of the 110, and the touch panel 200 can be configured to have a left or right narrow border or a borderless structure.

The embodiment of the present invention can be applied to any type of touch display device that uses a wire to connect a touch electrode to a pad. For example, the touch panel is formed outside a liquid crystal display (LCD) or the touch panel is formed on the liquid crystal display. On a color filter (CF). In addition, the pattern design of the first touch electrode 102a and the second touch electrode 102b is not limited to the type in the above figure.

Although the present disclosure has been disclosed above in the specific preferred embodiments, it is not intended to limit the present invention, and any prior art has the usual knowledge. The various embodiments described above may be modified and combined without departing from the spirit and scope of the present invention.

100‧‧‧ touch panel

101‧‧‧Substrate

102a‧‧‧First touch electrode

102b‧‧‧second touch electrode

103a‧‧‧First transmission line

103b‧‧‧second transmission line

104a‧‧‧First mat

104b‧‧‧second mat

107‧‧‧First via

110‧‧‧ touch area

120‧‧‧ shading area

Claims (10)

A touch panel includes: a first touch electrode and a second touch electrode, which are insulatively arranged in a touch area; a first transmission line is disposed in a light shielding area on a side of the touch area; And electrically connecting the first touch electrode; and a second transmission line electrically connected to the second touch electrode, and extending from the touch area to the light shielding area, wherein the first transmission line located in the light shielding area And the second transmission line is disposed on a single side of the touch area. The touch panel of claim 1, wherein the second touch electrode comprises a plurality of axial electrodes extending along a first direction and parallel to each other, the second transmission line comprising a plurality of stripes perpendicular to the a wire extending in a second direction in the first direction and parallel to each other, wherein the wires are electrically connected to one of the axial electrodes via a via hole and at least one of the axial directions that are not electrically connected The electrodes are staggered in insulation. The touch panel of claim 2, further comprising a first insulating layer disposed between the first touch electrode and the second touch electrode. The touch panel of claim 3, wherein the second transmission line is located above the second touch electrode, the conductive via is disposed in the first insulating layer, and the second transmission line and the first touch The control electrodes are located in the same layer structure. The touch panel of claim 4, further comprising a protective layer covering the first touch electrode and the second transmission line. For example, the touch panel described in claim 3 includes a second The edge layer is disposed under the second touch electrode. The touch panel of claim 6, wherein the second transmission line is disposed under the second touch electrode, the conductive via is disposed in the second insulating layer, and the second insulating layer is interposed therebetween Between the second touch electrode and the second transmission line. The touch panel of claim 7, wherein the second transmission line has a first width in the touch area, the second transmission line has a second width in the light shielding area, and the first width is greater than The second width. The touch panel of claim 1, wherein the first touch electrode is a receiving electrode, and the second touch electrode is a driving electrode. The touch panel of claim 1, wherein the material of the first transmission line and the second transmission line comprises a metal mesh, a nano silver wire or a transparent conductive material.