TWI699680B - Touch panel and touch display device using same - Google Patents

Abstract

A touch panel includes an insulating substrate having an upper surface and a lower surface opposite to each other, a plurality of first touch electrodes on the upper surface, and a plurality of second touch electrodes disposed on the lower surface. The first touch electrodes and the second touch electrodes are located in a touch area. The touch panel further includes a plurality of first traces on the insulating substrate and in the border area. One end of each of the first traces is connected to the first touch electrode, and the other end of the first trace is connected to a first connecting pad. The first connection pad is disposed on the upper surface. A conductive layer is disposed on the lower surface. A projection of the conductive layer on the insulating substrate along a normal direction of the insulating substrate surrounds and does not overlap with a projection of each of the first connection pads on the insulating substrate along a normal direction of the insulating substrate. The present invention also provides a touch display device using the above touch panel. The the conductive layer effectively prevents from generating a false sensing point by an active pen touching the border area.

Description

Touch panel and touch display device using the same

The invention relates to a touch panel and a touch display device using the touch panel, in particular to a touch display device matched with a touch pen.

The conventional touch display device usually includes a touch panel and a display panel that are stacked. The touch display device defines a display touch area and a frame area surrounding the display touch area. A touch panel usually includes a substrate, a plurality of touch drive (Tx) electrodes sequentially stacked on the surface of the substrate, an insulating layer, and a plurality of touch sensing (Rx) electrodes, and the insulation layer is stacked on the plurality of Tx electrodes and the plurality of Rx electrodes. Between the electrodes, the substrate is also provided with a plurality of metal leads electrically connected to the Tx touch electrode and the Rx electrode, wherein the Tx electrode and the Rx electrode are arranged in the display touch area, and the metal leads are arranged in Border area. One end of the metal lead is electrically connected to the Tx electrode or the Rx electrode, and the other end extends to the bonding area in the frame area and is electrically connected to the control circuit.

The conventional high-end touch display device usually has a very narrow frame area and is equipped with an active pen as an input device. An active pen usually includes a pen body, an internal signal drive circuit arranged in the pen body, and a battery. The battery supplies power to the signal drive circuit, and the signal drive circuit generates an active excitation signal. The active pen sends out an excitation signal, and a touch sensor arranged in the display touch area receives the signal from the active pen. However, due to the densest wiring in the bonding area and the relatively large conductive area, when the tip of the active pen touches the bonding area of the border area, it is easy to produce false sensing (false alarm points) in the display touch area, even the active pen When the tip of the pen touches the traces in the border area, there will be a trace of induction.

In view of this, it is necessary to provide a touch panel, which can effectively avoid false alarm points caused by the active pen touching the frame area.

One aspect of the present invention provides a touch panel, which defines a touch area and a frame area surrounding the touch area. The touch panel includes: An insulating substrate, the insulating substrate comprising an upper surface and a lower surface which are arranged oppositely; A plurality of first touch electrodes located on the upper surface; A plurality of second touch electrodes are located on the lower surface, the first touch electrodes and the second touch electrodes are insulated and crossed and are located in the touch area; There are a plurality of first wires arranged on the insulating substrate and located in the frame area. One end of each first wire is connected to the first touch electrode, and the other end is connected to a first connection pad, and the first connection pad is arranged on the Upper surface There are a plurality of second traces arranged on the insulating substrate and located in the frame area. One end of each of the first and second traces is connected to the second touch electrode, and the other end is connected to a second connection pad, the first connection pad and the second The connecting pad defines a bonding area located in the frame area; A grid-shaped conductive layer is provided on the lower surface, and the projection of the conductive layer on the insulating substrate along the normal direction of the insulating substrate surrounds each first connection pad and is not connected to the first connection pad. Contact overlap.

Another aspect of the present invention provides a touch display device, which includes a display panel and a touch panel disposed on the display panel, and the touch panel is the above-mentioned touch panel.

In the present invention, by providing a conductive layer surrounding the first connection pad on the insulating substrate, it can effectively avoid the false alarm point caused by the active pen touching the frame area.

The drawings show embodiments of the present invention. The present invention can be implemented in a variety of different forms, and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to enable those skilled in the art to fully understand the scope of the present invention. In order to be clearly visible, in the figure, the size of layers and regions have been enlarged.

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

Please refer to FIG. 1, the touch panel 100 according to the preferred embodiment of the present invention defines a touch area 101 and a frame area 103 surrounding the touch area 101.

Please refer to FIG. 3 in combination, the touch panel 100 includes an insulating substrate 10. The insulating substrate 10 includes an upper surface 11 and a lower surface 12 disposed oppositely. A plurality of first touch electrodes 20 and a plurality of second touch electrodes 30 are formed on the insulating substrate 10. The plurality of first touch electrodes 20 are formed on the upper surface 11, and the plurality of second touch electrodes 30 are formed on the lower surface 12. The plurality of first touch electrodes 20 and the plurality of second touch electrodes 30 are both arranged in the touch area 101.

In this embodiment, the sensing method of the touch panel 100 is a mutual capacitance type. Each first touch electrode 20 extends in a strip shape along the first direction D1, and each second touch electrode 30 extends in a strip shape along the second direction D2. The second direction crosses the first direction. In this embodiment, the second direction crosses the first direction perpendicularly. In this way, the first touch electrode 20 and the second touch electrode 30 are insulated and crossed. In this embodiment, the first touch electrode 20 is a touch sensing (Rx) electrode, and the second touch electrode 30 is a touch driving (Tx) electrode. It can be understood that in other embodiments, the first touch electrode 20 may be a Tx electrode, and the second touch electrode 30 may be an Rx electrode. In this embodiment, the plurality of first touch (Rx) electrodes 20 are located on the upper surface 11 of the insulating substrate 10, and the second touch (Tx) electrodes 30 are located on the lower surface 12 of the insulating substrate 10.

As shown in FIG. 1, the touch panel 100 further includes a plurality of wires electrically connected to the plurality of first touch electrodes 20 and the plurality of second touch electrodes 30 respectively. Multiple wiring lines are arranged in the border area 103. In this embodiment, the wiring connected to the first touch electrode 20 among the multiple wirings is defined as the first wiring 51, and the wiring connected to the second touch electrode 30 is defined as the second wiring 52. The border area 103 also includes a bonding area 105. The multiple wiring lines extend to the bonding area 105 to be electrically connected to a control circuit (such as FPC, not shown).

As shown in FIG. 2, one end of each first wiring 51 is connected with a contact pad 53a, and the other end is connected with a first connection pad 54a. Each first wiring 51 is connected to a first touch electrode through the contact pad 53a. 20. The first connection pad 54a is arranged in the bonding area 105 to communicate with the control circuit through the first connection pad 54a. As shown in FIG. 2, one end of each second trace 52 is connected to a contact pad 53b, and the other end is connected to a second connection pad 54b. Each second trace 52 is connected to a second touch electrode through the contact pad 53b. 30. The second connection pad 54b is disposed in the bonding area 105 to communicate with the control circuit through the second connection pad 54b. The first trace 51 and the contact pad 53a and the first connection pad 54a electrically connected to it are arranged on the upper surface 11 of the insulating substrate 10; the second trace 52 and the contact pad 53b and the second connection pad 54b electrically connected to it are provided It is provided on the lower surface 12 of the insulating substrate 10.

In order to avoid false alarms when the active pen (not shown) touches the first connection pad 54a, as shown in FIG. 3, the touch panel 100 is provided with a conductive layer 40 on the lower surface 12 corresponding to the first connection pad 54a on the upper surface 11. In addition, a bonding pad 54c electrically connected to the conductive layer 40 is provided on the upper surface 11, and the bonding pad 54c is electrically connected to the control circuit. In this way, when the active pen touches the first connection pad 54a of the bonding area 105, the conductive layer 40 detects the sensing signal and transmits the corresponding sensing signal to the control circuit, which is determined by the control circuit so that no false alarm will be generated point.

As shown in FIGS. 1 and 2, the conductive layer 40 has a grid shape, and its projection on the insulating substrate 10 along the normal direction of the insulating substrate 10 surrounds each of the first connection pads 54a, and is not connected to the first connection pad 54a. There is contact overlap. As shown in FIG. 1, the conductive layer 40 includes an outer frame line 41 surrounding all the first connection pads 54a and a plurality of inner frame lines 43 connected to the outer frame line 41 at intervals, and each inner frame line 43 is disposed adjacent to each other. The two first connection pads 54a are not in contact and overlap with the first connection pad 54a. As shown in Fig. 1, in this embodiment, the inner frame line 43 has an "X" shape. In this embodiment, the outer frame line 41 is rectangular, which includes four outer frame lines 41 connected end to end in sequence. The opposite ends of the inner frame wire 43 are respectively connected to two opposite outer frame wires 41. As shown in FIG. 2, the shortest distances a, b, c, d, e, and f between each outer frame line 41 and the first connection pad 54a are all greater than zero and less than 1 millimeter.

The pattern of the conductive layer 40 may be various, and is not limited to the pattern shown in FIG. 2. In an embodiment, please refer to the touch panel 100 shown in FIG. 4, the conductive layer 40 includes an outer frame line 41 enclosing a rectangle and a plurality of inner frame lines 43 connected to the outer frame line 41 and arranged at intervals; each inner frame The line 43 is a straight line, and its opposite ends are respectively connected with two opposite outer frame lines 41. In another embodiment, please refer to the touch panel 100 shown in FIG. 5, each inner frame line 43 of the conductive layer 40 is a diamond-shaped lattice connected and arranged in sequence. It is understandable that the pattern of the conductive layer 40 can also be other various patterns, as long as it is ensured that the outer frame line 41 surrounds all the first connection pads 54a, and each inner frame line 43 is disposed on two adjacent first connection pads. 54a are not in contact and overlap with the first connection pad 54a.

As shown in FIG. 1, in addition, the lower surface 12 of the insulating substrate 10 is further provided with an additional conductive layer 50 corresponding to the contact pad 53 a on the upper surface 11 and the first wiring 51 connected thereto. The projection of the additional conductive layer 50 on the insulating substrate 10 along the normal direction of the insulating substrate 10 covers the contact pad 53 a and the portion of the first trace 51 connected thereto. The additional conductive layer 50 has a grid shape. The additional conductive layer 50 is also electrically connected to the bonding pad 54c. In this way, when the active pen touches the contact pad 53a of the bonding area 105 and the first trace 51, the additional conductive layer 50 will detect the sensing signal and transmit the corresponding sensing signal to the control circuit. Therefore, no false alarm points are generated.

The material of the conductive layer 40 and the additional conductive layer 50 can be various conductive materials conventionally used in the field, such as indium tin oxide, metal grids, nano silver wires, carbon nanotubes, and the like.

In this embodiment, the bonding pad 54c is disposed on the upper surface 11 of the insulating substrate 10 and is located beside the first connection pad 54a. Since the conductive layer 40 and the additional conductive layer 50 are located on the lower surface 12 of the insulating substrate 10, the conductive layer 40 and The additional conductive layer 50 needs to be electrically connected to the bonding pad 54c through a via hole (not shown) penetrating the insulating substrate 10.

The above embodiment is mainly to prevent the active pen (not shown) from touching the first connection pad 54a and generating false alarm points as an example. In fact, to prevent the active pen (not shown) from touching the second connection pad 54b. For the false alarm point, the touch panel 100 is also provided with a conductive layer on the upper surface 11 (not shown in FIGS. 1-3, refer to the conductive grid 60 shown in FIG. 8) corresponding to the second connection pad 54b on the lower surface 12. The arrangement and arrangement of the conductive layer can be the same as the arrangement of the conductive layer 40, and its projection on the insulating substrate 10 along the normal direction of the insulating substrate 10 surrounds each second connection pad 54b, and is not connected to the second connection pad 54b. There is contact overlap.

In an embodiment, referring to FIGS. 6 and 7, in the touch panel 200, not only the conductive layer 40 corresponding to the first connection pad 54a of the bonding region 105 is provided on the lower surface 12 of the insulating substrate 10, corresponding to the bonding The second trace 52 near the fixed area 105 is also provided with a conductive grid 60.

The conductive grid 60 is disposed on the upper surface 11 of the insulating substrate 10, and the projection on the insulating substrate 10 along the normal direction of the insulating substrate 10 covers the part of the second wiring 52, as shown in FIG. The conductive grid 60 is electrically connected to the control circuit to transmit the sensing signal to the control circuit.

In an embodiment, referring to FIGS. 8 and 9, in the touch panel 300, not only the conductive layer 40 corresponding to the first connection pad 54a of the bonding area 105 is provided on the lower surface 12 of the insulating substrate 10, which corresponds to The second connection pad 54b in the fixed area 105 and the second trace 52 connected to the second connection pad 54b beside the bonding area 105 are further provided with a conductive grid 60.

The conductive grid 60 is arranged on the upper surface 11 of the insulating substrate 10, and the projection on the insulating substrate 10 along the normal direction of the insulating substrate 10 surrounds each second connection pad 54b and does not overlap with the second connection pad 54b. , As shown in Figure 8. The projection of the conductive grid 60 on the insulating substrate 10 along the normal direction of the insulating substrate 10 may also overlap with a part of the second trace 52, as shown in FIG. 8. It is understandable that the conductive grid 60 is not limited to the pattern shown in FIG. 8, but can also have various other shapes, as long as its projection on the insulating substrate 10 along the normal direction of the insulating substrate 10 surrounds each second connection pad. 54b and does not overlap with the second connection pad 54b.

Please refer to the touch display device 500 shown in FIG. 10. The touch display device 500 includes a display panel 210 and the aforementioned touch panel 100 disposed on the display panel 210, and the touch panel 100 is disposed away from the display The transparent cover 220 on one side of the panel 210. An optical transparent glue 230 can be provided between the touch panel 100 and the transparent cover 220, and an optical transparent glue 230 can also be provided between the touch panel 100 and the display panel 210. The touch panel can be any of the above touch panels, and is not limited to the touch panel 100. The touch display device 500 may be a mobile phone, a tablet computer, a notebook computer, etc. The display panel 210 may be a liquid crystal display panel, an OLED display panel, a micro LED display panel, and the like.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. The up, down, left and right directions shown in the figure are only for ease of understanding. Although the present invention has been described in detail with reference to the preferred embodiments, the technical field An ordinary person of should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

100, 200, 300: touch panel 101: Touch area 103: Border area 10: Insulating substrate 11: upper surface 12: lower surface 20: The first touch electrode 30: The second touch electrode 105: Bonding District 51: first trace 52: second trace 53a, 53b: contact pad 54a: First connection pad 54b: second connection pad 40: conductive layer 54c: Bonding pad 41: Outer frame 43: inner frame 50: additional conductive layer 60: Conductive grid 500: Touch display device 210: display panel 220: Transparent cover 230: Optical transparent glue

FIG. 1 is a schematic diagram of a touch panel according to the first embodiment of the present invention.

FIG. 2 is a partial schematic diagram of the touch panel of FIG. 1.

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

FIG. 4 is a schematic diagram of a touch panel according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a touch panel according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram of a touch panel according to a fourth embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of the touch panel of FIG. 6 taken along the section line VII-VII.

FIG. 8 is a schematic diagram of a touch panel according to a fifth embodiment of the present invention.

9 is a schematic cross-sectional view of the touch panel of FIG. 8 taken along the section line IX-IX.

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

100: touch panel

101: Touch area

103: Border area

10: Insulating substrate

20: The first touch electrode

30: The second touch electrode

105: Bonding District

51: first trace

52: second trace

53a, 53b: contact pad

54a: First connection pad

54b: second connection pad

40: conductive layer

54c: Bonding pad

41: Outer frame

43: inner frame

50: additional conductive layer

Claims (10)

A touch panel is defined with a touch area and a frame area surrounding the touch area. The touch panel includes: An insulating substrate, the insulating substrate comprising an upper surface and a lower surface which are arranged oppositely; A plurality of first touch electrodes located on the upper surface; A plurality of second touch electrodes located on the lower surface, the plurality of first touch electrodes and the plurality of second touch electrodes are insulated and crossed and are located in the touch area; A plurality of first wiring lines disposed on the insulating substrate and located in the frame area, one end of each first wiring line is connected to the first touch electrode, and the other end is connected to a first connection pad, the first connection pad Set on the upper surface; A plurality of second wiring lines arranged on the insulating substrate and located in the frame area, one end of each second wiring line is connected to the second touch electrode, and the other end is connected to a second connection pad, the first connection pad And the second connecting pad define a bonding area located in the frame area; The improvement is that a grid-shaped conductive layer is provided on the lower surface, and the projection of the conductive layer on the insulating substrate along the normal direction of the insulating substrate surrounds each first connection pad and is not connected to the first connection pad. One connection pad has contact overlap. The touch panel according to claim 1, wherein: the bonding area is provided with a bonding pad electrically connected to a control circuit, and the bonding pad is electrically connected to the conductive layer to connect the conductive layer The signal is transmitted to the control circuit. The touch panel according to claim 1, wherein: the conductive layer includes an outer frame line surrounding all the first connection pads and a plurality of inner frame lines connected to the outer frame line, and each inner frame line is set at Between two adjacent first connection pads and do not contact and overlap with the first connection pads. The touch panel according to claim 3, wherein the shortest distance between the outer frame line and the first connection pad is greater than zero and less than 1 millimeter. The touch panel according to claim 1, wherein: each of the first traces is connected to a first touch electrode via a contact pad, the contact pad is disposed in the frame area and on the upper surface, so The lower surface is also provided with an additional conductive layer corresponding to the contact pad. The touch panel according to claim 5, wherein: the additional conductive layer is grid-shaped, and its projection on the insulating substrate along the normal direction of the insulating substrate covers the contact pad and the portion of the first trace connected to it. . The touch panel according to claim 1, wherein: the second wiring outside the bonding area is further provided with a conductive mesh, the second wiring is provided on the lower surface, and the conductive mesh The grid is arranged on the upper surface, and the projection on the insulating substrate along the normal direction of the insulating substrate covers the part of the second wiring. The touch panel according to claim 1, wherein: the second connection pad in the corresponding bonding area is further provided with a conductive grid, the second connection pad is provided on the lower surface, and the conductive grid is provided on the upper surface. The surface and the projection on the insulating substrate along the normal direction of the insulating substrate surrounds each second connection pad and does not overlap with the second connection pad. The touch panel according to claim 8, wherein the projection of the conductive grid on the insulating substrate along the normal direction of the insulating substrate also covers the part of the second trace. A touch display device includes a display panel and a touch panel arranged on the display panel, the touch panel being the touch panel described in any one of claim items 1-9.

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