TW201523367A - Touch panel - Google Patents

Abstract

A touch panel includes a first substrate, a second substrate, a plurality of first electrodes, a first trace, a second trace and a conductive structure. The second substrate is disposed corresponding to the first substrate, and a first surface of the first substrate faces a fourth surface of the second substrate. The first electrodes are disposed on the first surface and at least partially disposed in an opening region. The first trace is disposed on the first surface and at least partially disposed in a peripheral region. The first trace is electrically connected to one of the first electrodes. The second trace is disposed on the fourth surface and at least partially disposed in the peripheral region. The conductive structure is disposed between the first substrate and the second substrate. The second trace is electrically connected to another one of the first electrode via the conductive structure.

Description

Touch panel

The present invention relates to a touch panel, and more particularly to a touch panel in which a wiring portion connected to the same sensing electrode is disposed on another substrate to reduce a surrounding area.

The technology development of touch panels is very diverse, and the more common technologies include resistive, capacitive, and optical. Among them, capacitive touch panels have become the mainstream touch technology used in middle and high-end consumer electronic products due to their high accuracy, multi-touch, high durability and high touch resolution. The operation principle of the capacitive touch panel is to use the sensing electrode to detect the change of the capacitance of the touch point, and to use the connecting line connecting the electrodes on different axes to transmit the signal back to complete the positioning. As shown in FIG. 1 , the conventional capacitive touch panel 100 includes a first axial electrode 120 and a second axial electrode 130 extending in different directions, and is insulated from the central region 141 for touch control. Sensing position. The first touch signal trace 120T and the second touch signal trace 130T connected to the first axial electrode 120 and the second axial electrode 130 are respectively disposed in the surrounding area 142, and in the surrounding area 142 and the flexible circuit board. The 190 is electrically connected for transmitting a signal between the flexible circuit board 190 and the first axial electrode 120 / the second axial electrode 130. Generally, the first axial electrode 120 and the first touch signal trace 120T are disposed on the same substrate 111. Since the line width and the spacing of the first touch signal lines 120T have a certain size limitation due to electrical requirements, when the touch resolution of the capacitive touch panel 100 is required to be increased, the first axial electrode 120 and The number of the second axial electrodes 130 is increased, and the number of the first touch signal traces 120T must be relatively increased, thereby causing the surrounding area 142 to maintain a certain area size, which is unfavorable for improving the appearance. The design trend of the narrow border of the touch panel.

One of the main purposes of the present invention is to provide a touch panel in which a trace portion connected to the same sensing electrode is disposed on another substrate, thereby reducing the required size of the surrounding area.

To achieve the above objective, a preferred embodiment of the present invention provides a touch panel having a light transmissive area and a peripheral area on at least one side of the light transmissive area. The touch panel includes a first substrate, a second substrate, a plurality of first electrodes, at least one first trace, at least one second trace, and at least one conductive structure. The first substrate has a first surface and a second surface opposite the first surface. The second substrate is disposed opposite to the first substrate. The second substrate has a third surface and a fourth surface is opposite to the third surface, and the first surface of the first substrate faces the fourth surface of the second substrate. The first electrode is disposed on the first surface of the first substrate and at least partially located in the light transmissive region. The first trace is disposed on the first surface of the first substrate and at least partially located in the surrounding area, and the first trace is electrically connected to one of the first electrodes. The second trace is disposed on the fourth surface of the second substrate and at least partially located in the surrounding area, and the second trace is electrically connected to the other of the first electrodes. The conductive structure is disposed between the first substrate and the second substrate, and the second trace is electrically connected to one of the first electrodes through the conductive structure.

In the touch panel of the present invention, the first trace and the second trace electrically connected to the first electrode are respectively disposed on the first substrate and the second substrate, thereby reducing the required area of the surrounding area. The size, and thus the design of the narrow border of the touch panel.

100‧‧‧Capacitive touch panel

111‧‧‧Substrate

120‧‧‧First axial electrode

120T, 220T‧‧‧ first touch signal trace

130‧‧‧Second axial electrode

130T, 230T‧‧‧ second touch signal routing

141‧‧‧Central District

142‧‧‧ surrounding area

190‧‧‧Soft circuit board

200‧‧‧ touch panel

211‧‧‧First substrate

211A‧‧‧ first surface

211B‧‧‧ second surface

212‧‧‧second substrate

212A‧‧‧ third surface

212B‧‧‧Fourth surface

213‧‧‧ Third substrate

213A‧‧‧ fifth surface

213B‧‧‧ sixth surface

220‧‧‧First electrode

230‧‧‧second electrode

240‧‧‧Electrical structure

251‧‧‧First adhesive layer

252‧‧‧Second adhesive layer

253‧‧‧ third adhesive layer

260‧‧‧decorative layer

290‧‧‧Control elements

300‧‧‧ touch panel

400‧‧‧ touch panel

500‧‧‧ touch panel

600‧‧‧ touch panel

700‧‧‧Touch panel

800‧‧‧ touch panel

900‧‧‧Touch panel

991, 992‧‧‧ Compensation lines

R1‧‧‧Light transmission area

R2‧‧‧ surrounding area

S‧‧‧ interval area

T1‧‧‧ first line

T2‧‧‧ second line

X‧‧‧ first direction

Y‧‧‧second direction

Z‧‧‧Vertical projection direction

FIG. 1 is a schematic diagram of a conventional capacitive touch panel.

FIG. 2 is a schematic view of a touch panel according to a first preferred embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view taken along line A-A' in Fig. 2.

Fig. 4 is a schematic cross-sectional view taken along line B-B' in Fig. 2.

FIG. 5 is a schematic view showing a touch panel of a second preferred embodiment of the present invention.

FIG. 6 is a schematic view showing a touch panel of a third preferred embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view taken along line C-C' in Fig. 6.

Fig. 8 is a schematic cross-sectional view taken along line D-D' in Fig. 6.

FIG. 9 is a schematic view showing a touch panel of a fourth preferred embodiment of the present invention.

FIG. 10 is a schematic view showing a touch panel of a fifth preferred embodiment of the present invention.

FIG. 11 is a schematic view showing a touch panel of a sixth preferred embodiment of the present invention.

FIG. 12 is a schematic view showing a touch panel of a seventh preferred embodiment of the present invention.

Fig. 13 is a schematic cross-sectional view taken along line E-E' in Fig. 12.

FIG. 14 is a schematic view showing a touch panel of an eighth preferred embodiment of the present invention.

15A, 15B, 15C, and 15D are schematic views showing the shape of the compensation line of the touch panel of the present invention.

The present invention will be described in detail with reference to the preferred embodiments of the invention,

As shown in FIG. 2 to FIG. 4, the touch panel 200 of the first preferred embodiment of the present invention has a light transmissive region R1 and a peripheral region R2 located on at least one side of the light transmissive region R1. In the present embodiment, the surrounding area R2 preferably surrounds the light transmitting area R1, but is not limited thereto. The touch panel 200 includes a first substrate 211 , a second substrate 212 , a plurality of first electrodes 220 , at least one first trace T1 , at least one second trace T2 , and at least one conductive structure 240 . The first substrate 211 has a first surface 211A and a second surface 211B, and the first surface 211A is opposite to the second surface 211B. The second substrate 212 is disposed opposite to the first substrate 211. The second substrate 212 has a third surface 212A and a fourth surface 212B opposite to the third surface 212A, and the first surface 211A of the first substrate 211 faces the fourth surface 212B of the second substrate 212. The first electrode 220 is disposed on the first surface 211A of the first substrate 211 and at least partially located in the light transmissive region R1. First trace T1 The first trace 211A is disposed on the first surface 211A of the first substrate 211 and at least partially located in the peripheral region R2, and the first trace T1 is electrically connected to one of the first electrodes 220. The second trace T2 is disposed on the fourth surface 212B of the second substrate 212 and at least partially located in the peripheral region R2, and the second trace T2 is electrically connected to the other one of the first electrodes 220. The conductive structure 240 is disposed between the first substrate 211 and the second substrate 212 , and the second trace T2 is electrically connected to one of the first electrodes 220 through the conductive structure 240 . In this embodiment, the touch panel 200 may include a plurality of first electrodes 220 and a plurality of corresponding first traces T1, a plurality of second traces T2, and a plurality of conductive structures 240, but not limited thereto. . Each of the first electrodes 220 of the embodiment extends in a first direction X, but the invention is not limited thereto. In other preferred embodiments of the present invention, other shapes, such as triangular, diamond, and polygonal first electrodes 220 may be used as needed to perform the desired touch sensing operation. In addition, the first trace T1 and the second trace T2 respectively connected to the first electrode 220 are respectively disposed on the first substrate 211 and the second substrate 212, and the first trace T1 and the second trace T2 are respectively disposed. The first area 211 is perpendicular to the vertical projection direction Z of the first substrate 211, so that the required area of the peripheral area R2 on the first substrate 211 and the second substrate 212 can be reduced, thereby achieving a narrow border. )Effect.

The touch panel 200 further includes a plurality of second electrodes 230 and a first adhesive layer 251. The second electrode 230 is at least partially disposed in the light transmissive region R1, and the first electrode 220 and the second electrode 230 are crossed and insulated from each other. Each of the second electrodes 230 extends along a second direction Y, and the first direction X is preferably substantially perpendicular to the second direction Y, but is not limited thereto. In addition, the second electrode 230 of the embodiment is disposed on the fourth surface 212B of the second substrate 212, and the first adhesive layer 251 is disposed between the first substrate 211 and the second substrate 212 for bonding the first The substrate 211 and the second substrate 212. The touch panel 200 further includes a plurality of second touch signal traces 230T disposed on the second substrate 212 and located in the surrounding area R2. Both the first trace T1 and the second trace T2 can be regarded as the first touch signal trace 220T. Each of the first touch signal traces 220T and the second touch signal traces 230T are respectively connected to the first electrode 220 and the second electrode 230, and each of the first touch signal traces 220T and the second touch The other end of the control signal line 230T and the control element The device 290 is electrically connected to a flexible printed circuit (FPC) or a control integrated circuit (IC) for performing touch signal transmission. The first electrode 220 and the second electrode 230 of the embodiment can be used as the touch signal driving electrode and the touch signal receiving electrode respectively, so that the touch panel 200 can perform a mutual capacitive touch sensing detection. , but not limited to this.

In this embodiment, at least one of the first substrate 211 and the second substrate 212 may include a glass substrate, a plastic substrate, a glass film, a plastic film, a cover plate, a substrate of a display, or the like. A suitable substrate for materials and applications. The substrate of the above display may include a color filter substrate, an array substrate or a package cover of an organic light emitting display, but is not limited thereto. The form of the first electrode 220, the second electrode 230, the first trace T1, the second trace T2, and the second touch signal trace 230T may include a film or a mesh, and the material of the film or mesh It may include transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO) and aluminum zinc oxide (AZO), nano silver wire, carbon nanotubes, and high A molecular conductive material or a metal conductive material such as at least one of aluminum, copper, silver, chromium, titanium, molybdenum, a composite layer of the above materials, or an alloy of the above materials, but is not limited thereto. The first adhesive layer 251 preferably may comprise an optical clear adhesive (OCA), a pressure sensitive adhesive (PSA) or other suitable bonding material. It should be noted that the conductive structure 240 of the embodiment may preferably include an Au ball, an anisotropic conductive film (ACF), a silver paste or other suitable conductive material, thereby being The second trace T2 on the second substrate 212 is electrically connected to the corresponding first electrode 220 through the conductive structure 240.

As shown in FIG. 5, the touch panel 300 of the second preferred embodiment of the present invention further includes a decorative layer 260 disposed between the first substrate 211 and the second substrate 212 and located in the peripheral region R2. In this embodiment, the decorative layer 260 is disposed on the fourth surface 212B of the second substrate 212 and between the second trace T2 and the second substrate 212, but is not limited thereto. In addition, the second substrate 212 of the embodiment is preferably a cover plate, such as a cover glass or a cover plastic plate. (cover plastic). The cover plate may be a light-transmissive substrate strengthened by chemical or physical methods, such as tempered glass after chemical ion exchange or heat treatment, having high mechanical strength, anti-fouling, scratch resistance and the like, and can protect adjacent touch elements. Or a monitor. The decorative layer 260 can be used to form an appearance decoration effect on one side of the third surface 212A of the second substrate 212, but the invention is not limited thereto. In other preferred embodiments of the present invention, the decorative layer 260 may also be disposed on the first surface 211A of the first substrate 211 as needed. The material of the decorative layer 260 can include ink, colored photoresist, or other suitable material that can form a particular color or texture.

As shown in FIG. 6 to FIG. 8 , the touch panel 400 of the third preferred embodiment of the present invention is different from the first preferred embodiment in that the first embodiment is provided on the first substrate 211 and The first trace T1 and the second trace T2 on the second substrate 212 are preferably disposed offset from each other to reduce signal interference between each other. In this embodiment, the two adjacent first traces T1 have a spacing area S therebetween, and the at least one second trace T2 and the corresponding spacing area S at least partially overlap each other in the vertical projection direction Z, thereby The size of the area where the first trace T1 and the second trace T2 overlap each other in the vertical projection direction Z is reduced, thereby further reducing the signal interference between the first trace T1 and the second trace T2. More specifically, the center point of the at least one second trace T2 in the first direction X preferably overlaps with the corresponding spacing area S in the vertical projection direction Z. It should be noted that the design that the first trace T1 and the second trace T2 of the present embodiment are offset from each other may also be applied to other preferred embodiments of the present invention described above and later.

As shown in FIG. 9 , the touch panel 500 of the fourth preferred embodiment of the present invention is different from the first preferred embodiment in that the touch panel 500 further includes a third substrate 213 , a decorative layer 260 , and A second adhesive layer 252. The third substrate 213 is disposed on one side of the third surface 212A of the second substrate 212. More specifically, the third substrate 213 has a fifth surface 213A and a sixth surface 213B opposite to the fifth surface 213A. The sixth surface 213B of the third substrate 213 faces the third surface 212A of the second substrate 212, but is not limited thereto. The second adhesive layer 252 is disposed between the second substrate 212 and the third substrate 213 for bonding the second substrate 212 and the third substrate 213 . The third substrate 213 may include a glass substrate, a plastic substrate, a glass film, and a plastic film. A film, a cover sheet, a substrate for a display, or other suitable substrate for materials and applications. The substrate of the above display may include a color filter substrate, an array substrate or a package cover of an organic light emitting display, but is not limited thereto. The second adhesive layer 252 preferably includes an optical glue, a pressure sensitive adhesive or other suitable bonding material. The decorative layer 260 of the present embodiment is disposed between the second substrate 212 and the third substrate 213 and located in the peripheral region R2. When the third substrate 213 is a cover plate, the decorative layer 260 is preferably disposed in the third layer. The sixth surface 213B of the substrate 213 is formed on one side of the fifth surface 213A by a decorative effect, but is not limited thereto. In addition, the second electrode 230 of the embodiment is preferably disposed on the third surface 212A of the second substrate 212, but is not limited thereto.

As shown in FIG. 10, the touch panel 600 of the fifth preferred embodiment of the present invention is different from the fourth preferred embodiment in that the first embodiment of the present invention is disposed on the first substrate 211 and the second substrate 212, respectively. The first trace T1 and the second trace T2 are preferably arranged offset from each other to reduce signal interference between each other. In this embodiment, the at least one second trace T2 and the corresponding spacer region S at least partially overlap each other in the vertical projection direction Z, thereby reducing the first trace T1 and the second trace T2 in the vertical projection direction Z. The size of the regions overlapping each other, in turn, can reduce the signal interference between the first trace T1 and the second trace T2.

As shown in FIG. 11 , the touch panel 700 of the sixth preferred embodiment of the present invention is different from the second preferred embodiment in that the touch panel 700 further includes a third substrate 213 and a third adhesive layer. 252. The third substrate 213 of the present embodiment is disposed on one side of the second surface 211B of the first substrate 211. More specifically, the third substrate 213 has the fifth surface 213A and the sixth surface 213B opposite to the fifth surface 213A. The fifth surface 213A of the third substrate 213 faces the second surface 211B of the first substrate 211, but is not limited thereto. The third adhesive layer 253 is disposed between the first substrate 211 and the third substrate 213 for bonding the first substrate 211 and the third substrate 213 . The third adhesive layer 253 preferably includes an optical adhesive, a pressure sensitive adhesive or other suitable adhesive material. In addition, the second electrode 230 of the present embodiment is disposed between the first substrate 211 and the third substrate 213. For example, as shown in FIG. 11, the second electrode 230 may be disposed on the fifth surface 213A of the third substrate 213. But it is not limited to this. In other preferred embodiments of the present invention, the second electrode 230 may also be set as needed. On the second surface 211B of the first substrate 211.

As shown in FIG. 12 and FIG. 13 , the touch panel 800 of the seventh preferred embodiment of the present invention is different from the first preferred embodiment in that the touch panel 800 includes only the first electrode 220 and not The second electrode of the above embodiment is provided. Therefore, the touch panel 800 of the present embodiment can be regarded as a one-layer solution (OLS) structure, but is not limited thereto. It should be noted that the shape of each of the first electrodes 220 of the embodiment may be adjusted as needed, for example, may be a triangle, a rectangle, a diamond, or other polygons, and the shape of the portion of the first electrode 220 may be designed to be mutually in need. Different shapes are used to match each other to perform the required mutual capacitive or self capacitive touch sensing detection. The touch panel 800 of the present embodiment has the same position and material characteristics as the first preferred embodiment except that it does not have the second electrode, and therefore will not be described herein.

As shown in FIG. 14, FIG. 15A, FIG. 15B, FIG. 15C, and FIG. 15D, the touch panel 900 of the eighth preferred embodiment of the present invention is different from the above-described first preferred embodiment in that At least one first trace T1 of the embodiment includes a compensation line 991, and at least one second trace T2 includes a compensation line 992. The compensation circuit 991 and the compensation circuit 992 are used to compensate for the difference in the resistance-capacitance delay (RC delay) effect caused by each of the first traces T1 and the second traces T2 when connected to the first electrodes 220 having different distances. By setting a compensation circuit with a long total path for the first trace T1 or the second trace T2 having a short length, the resistance-capacitance generated by each of the first trace T1 and each of the second traces T2 can be respectively generated. The delay effect tends to be consistent. In other words, each compensation line 991 and each compensation line 992 are preferably different in size or total path length, thereby generating the above-mentioned compensation effect, but not limited thereto. In addition, the compensation circuit 991 and the compensation circuit 992 preferably respectively include a square compensation circuit (as shown in FIG. 15A), a sawtooth compensation circuit (as shown in FIG. 15B), and a circular arc compensation circuit (eg, Figure 15C shows a one-string waveform compensation line (as shown in Figure 15D) or other suitable compensation line for the structure. It should be noted that, since the first trace T1 and the second trace T2 of the present invention are respectively disposed on the first substrate 211 and the second substrate 212, in other preferred embodiments of the present invention, the first walk Compensation line 991 of line T1 and second line The compensation lines 992 are preferably at least partially overlapped with each other in the vertical projection direction Z, so as to reduce the required area of the surrounding area R2, and the design of the reduced frame can still be achieved under the condition of setting the compensation line.

Please also note that the above description regarding the arrangement on the surface of the substrate is not limited to being directly contacted on the surface of the substrate.

In summary, the touch panel of the present invention is configured to reduce the touch panel by disposing the first trace and the second trace electrically connected to the first electrode on the first substrate and the second substrate, respectively. The required area of the surrounding area, in turn, the design of the narrow border of the touch panel. In addition, the present invention further displaces the first trace and the second trace to each other, thereby reducing the size of the overlapping area of the first trace and the second trace in the vertical projection direction, thereby reducing signal interference between the two traces. purpose.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

200‧‧‧ touch panel

211‧‧‧First substrate

212‧‧‧second substrate

220‧‧‧First electrode

220T‧‧‧First touch signal routing

230‧‧‧second electrode

230T‧‧‧Second touch signal routing

240‧‧‧Electrical structure

290‧‧‧Control elements

R1‧‧‧Light transmission area

R2‧‧‧ surrounding area

T1‧‧‧ first line

T2‧‧‧ second line

X‧‧‧ first direction

Y‧‧‧second direction

Z‧‧‧Vertical projection direction

Claims (15)

A touch panel has a light-transmissive area and a peripheral area, the peripheral area is located on at least one side of the light-transmissive area, and the touch panel comprises: a first substrate having a first surface and a second surface, The first surface is opposite to the second surface; a second substrate is disposed opposite the first substrate, wherein the second substrate has a third surface and a fourth surface, the third surface is opposite to the fourth surface And the first surface of the first substrate faces the fourth surface of the second substrate; the plurality of first electrodes are disposed on the first surface of the first substrate and at least partially located in the light transmissive region; At least one first trace is disposed on the first surface of the first substrate and at least partially located in the peripheral region, wherein the first trace is electrically connected to one of the first electrodes; at least one a second trace disposed on the fourth surface of the second substrate and at least partially located in the peripheral region, wherein the second trace is electrically connected to the other of the first electrodes; and at least one conductive Structure, set in the first Between the plate and the second substrate, wherein the second wiring line is connected through one of the electrically conductive structure and the plurality of first electrodes. The touch panel of claim 1, wherein the first trace and the second trace at least partially overlap each other in a vertical projection direction perpendicular to the first substrate. The touch panel of claim 1, further comprising a plurality of the first traces and the plurality of the second traces, wherein a spacing area formed between the two adjacent first traces, At least one of the second traces and at least one of the spacer regions at least partially overlap each other in a vertical projection direction perpendicular to the first substrate. The touch panel of claim 1, wherein the conductive structure comprises an Au ball, an anisotropic conductive film (ACF) or a silver paste. The touch panel of claim 1, further comprising a first adhesive layer disposed between the first substrate and the second substrate for bonding the first substrate and the second substrate. The touch panel of claim 1, further comprising a decorative layer disposed on the first substrate or the second substrate and located in the surrounding area. The touch panel of claim 1, further comprising a plurality of second electrodes disposed at least partially in the light transmissive region, wherein the first electrodes and the second electrode systems are crossed with each other and insulated from each other, The first electrode system extends along a first direction, and each of the second electrode lines extends along a second direction. The touch panel of claim 7, wherein the second electrodes are disposed on the fourth surface of the second substrate. The touch panel of claim 7, wherein the second electrodes are disposed on the third surface of the second substrate. The touch panel of claim 9, further comprising: a third substrate disposed on one side of the third surface of the second substrate; a decorative layer disposed on the second substrate and the third substrate And a second adhesive layer disposed between the second substrate and the third substrate for bonding the second substrate and the third substrate. The touch panel of claim 7, further comprising: a third substrate disposed on one side of the second surface of the first substrate, wherein the second electrodes are disposed between the first substrate and the third substrate; and a third adhesive layer disposed on the third substrate The first substrate and the third substrate are used to bond the first substrate and the third substrate. The touch panel of claim 1, wherein at least one of the first traces or at least one of the second traces comprises a compensation line. The touch panel of claim 12, wherein the compensation circuit comprises a square compensation circuit, a sawtooth compensation circuit, a circular arc compensation circuit or a chord waveform compensation circuit. The touch panel of claim 1, wherein at least one of the first substrate and the second substrate comprises a glass substrate, a plastic substrate, a cover plate or a display substrate. The touch panel of claim 14, wherein the substrate of the display comprises a color filter substrate, an array substrate or a package cover of an organic light emitting display.