TWI657360B - Touch panel and touch display device - Google Patents

Abstract

A touch panel defines a touch area and a routing area surrounding the touch area, the touch area is provided with a plurality of first electrodes and a plurality of second electrodes, and the wiring area is provided with a plurality of first And a plurality of second traces, the plurality of first traces are electrically connected to the first electrode, the plurality of second traces are electrically connected to the second electrode, and the touch panel further includes The plurality of first traces and the plurality of second traces are mutually insulated first ground lines, and the plurality of first traces, the first ground line, and the plurality of second traces are stacked one above the other in sequence, The plurality of first traces and the plurality of second traces respectively overlap the first ground line. The touch panel overlaps the first and second traces on the first ground line, which not only avoids signal interference between each other, but also reduces the size of the trace area, so that the touch panel The border size can be made narrow.

Description

Touch panel and touch display device

The present invention relates to the field of touch technology, and in particular, to a touch panel and a touch display device.

As an input medium, the touch display device is currently the simplest and most convenient mode of man-machine dialogue. Therefore, the touch display device is more and more applied to various electronic products. In response to market demand for light, thin, and beautiful, the design of narrow bezels will be one of the trends.

However, since the touch drive electrode line (Txline) and the touch sense electrode line (Rx line) are signals with different properties and signals with different properties, the voltage intensity is ten times worse. Therefore, touch drive The electrode traces (Tx line) and the touch sensing electrode traces (Rx line) must be separated by a thick ground line (GND) in parallel. Therefore, some frame space will be needed here to make the existing touch The bezel size of the control panel is larger.

In view of the above, it is necessary to provide a touch panel and a touch display device with a small frame size.

A touch panel defines a touch area and a routing area surrounding the touch area, the touch area is provided with a plurality of first electrodes and a plurality of second electrodes, and the wiring area is provided with a plurality of first And a plurality of second traces, the plurality of first traces are electrically connected to the first electrode, the plurality of second traces are electrically connected to the second electrode, and the touch panel further includes The plurality of first traces and the plurality of second traces are mutually insulated first ground lines, and the plurality of first traces, the first ground line, and the plurality of second traces are stacked one above the other in sequence, The plurality of first traces and the plurality of second traces respectively overlap the first ground line.

The touch panel provided by the embodiment of the present invention avoids signal interference between each other by overlapping a plurality of first traces and a plurality of second traces on the first ground line, and does not need to route the plurality of first traces at a level position. The wiring area of the touch panel is separated from the wiring area of the plurality of second wirings, so that the wiring space of the touch panel in the wiring area is smaller than that of a general touch panel in the wiring area, which effectively reduces touch. The size of the routing area of the panel makes the frame size of the touch panel smaller.

A touch display device includes the touch panel described above. Since the frame size of the touch panel is small, the touch display device also has the advantage of a narrow frame.

100, 200, 300‧‧‧ touch panel

101‧‧‧touch area

41‧‧‧first electrode

51‧‧‧Second electrode

102‧‧‧route area

10‧‧‧ the first substrate

11‧‧‧ lower surface

20‧‧‧ Insulation

30‧‧‧second substrate

31‧‧‧ Top surface

40‧‧‧first route

42‧‧‧Third route

50‧‧‧Second route

52‧‧‧Fourth Route

60‧‧‧The first ground wire

70‧‧‧Second ground wire

400‧‧‧ display panel

500‧‧‧ touch display device

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

Fig. 2 is a schematic cross-sectional view taken along section line II-II of Fig. 1.

3 is a schematic plan view of a first ground line of a touch panel on a first substrate according to a preferred embodiment of the present invention.

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

Fig. 5 is a schematic cross-sectional view taken along the section line V-V in Fig. 4.

6 is a schematic plan view of a second ground line of a touch panel on a second substrate according to a preferred embodiment of the present invention.

FIG. 7 is a schematic plan view of a touch panel according to a third embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view taken along the section line Ⅷ-Ⅷ in FIG. 7.

FIG. 9 is a schematic plan view of a touch display device according to a preferred embodiment of the present invention.

First embodiment

FIG. 1 is a schematic plan view of a touch panel according to a first embodiment of the present invention. As shown in FIG. 1, the touch panel 100 defines a touch area 101 and a routing area 102 surrounding the touch area 101. The touch area 101 is provided with a plurality of first electrodes 41 and a plurality of second electrodes. 51. The trace area 102 is provided with a plurality of first traces 40 and a plurality of second traces 50. The plurality of first traces 40 are electrically connected to the first electrode 41 and the plurality of second traces 50. The second electrode 51 is electrically connected.

Specifically, the plurality of first electrodes 41 are arranged in multiple rows along the first direction D1, and the plurality of first electrodes 41 in each row are electrically connected in sequence to form a first electrode string; the plurality of second electrodes 51 are arranged along the first The two directions D2 are arranged in multiple rows, and the plurality of second electrodes 51 in each column are sequentially electrically connected to form a second electrode string. Each first electrode string arranged in the first direction D1 and the second direction D2 are arranged in a row. Each second electrode string of the cloth is intersected, and the first direction D1 and the second direction D2 intersect. Preferably, the first direction D1 is orthogonal to the second direction D2. It can be understood that, in different embodiments of the present invention, the plurality of first electrodes 41 and the plurality of second electrodes 51 may be arranged in other manners, which is not limited here.

In this embodiment, both the first electrode 41 and the second electrode 51 are diamond-shaped. Understandably, The first electrode 41 and the second electrode 51 may also have other existing shapes and structures. For example, the plurality of first electrodes 41 may be rectangles extending in a first direction D1 and arranged to be separated from each other in a second direction D2. The plurality of second electrodes 51 may be rectangular strips extending along the first direction D2 and arranged along the second direction D1 to be isolated from each other.

Further, in a display device with a touch function, in order not to affect the display effect, the first electrode 41 and the second electrode 51 are transparent, and the first electrode 41 and the second electrode are transparent. The material of the electrode 51 may be indium tin oxide (ITO), metal mesh, nano-silver wire, nano-copper wire, or the like.

As shown in FIG. 1, in this embodiment, the touch area 101 is substantially rectangular, and the routing area 102 includes left and right areas located on the left and right sides of the touch area 101 and two areas above and below the touch area 101. The upper and lower side of the side. The plurality of first traces 40 and the plurality of second traces 50 extend at least in the trace region 102 on the same side of the touch region 101. One end of each first trace 40 is electrically connected to a first electrode string and extends in the trace area 102 on the left side of the touch area 101. One end of each second trace 50 is electrically connected to a second electrode string. The routing area 102 on the upper side of the touch area 101 extends to the routing area 102 on the left side of the touch area 101, that is, the plurality of first traces 40 and the plurality of second traces 50 are located on the same side of the touch area 101. The routing area 102 is located between the plurality of second routing lines 50 and the touch area 101. Because the first trace 40 and the second trace 50 in the trace area 102 on the same side of the touch area 101 are very close to each other in space, a first ground line 60 must be provided (as shown in FIGS. 2 and 3). (Shown) to prevent signal interference between the first trace 40 and the second trace 50.

Please continue to refer to FIG. 1. In this embodiment, the routing area 102 is further provided with a plurality of third traces 42 and a plurality of fourth traces 52. One end of each third trace 42 is electrically connected to a first electrode. After stringing, it extends in the routing area 102 on the right side of the touch area 101; one end of each of the fourth sub-traces 54 is electrically connected to one The second electrode string extends behind the routing area 102 under the touch area 101.

Fig. 2 is a schematic cross-sectional view taken along section line II-II of Fig. 1. As shown in FIG. 2, the touch panel 100 includes a first substrate 10, an insulating layer 20, and a second substrate 30 that are stacked in this order. In this embodiment, the plurality of first electrodes 41 and the plurality of first traces 40 are formed on the first substrate 10, and the plurality of second electrodes 51 and the plurality of second traces 50 are formed on the first substrate 10. On the second substrate 30, a material of the insulating layer 20 is a transparent optical glue. Specifically, the material of the insulating layer 20 may be an optical clear adhesive (OCA) or a liquid optical clear adhesive (LOCA).

Understandably, in this embodiment, the plurality of first electrodes 41 may be touch driving electrodes and the plurality of second electrodes 51 may be touch sensing electrodes; or the plurality of first electrodes 41 may be touch sensing electrodes and the plurality of second electrodes 51 It is a touch driving electrode. Among them, the plurality of first electrodes 41 and the plurality of second electrodes 51 form a mutual-capacitive touch sensing structure. When a touch occurs, the capacitive coupling between the first electrode 41 and the second electrode 51 near the touch point will be Will be affected, resulting in changes in sensing signals (such as voltage values) related to mutual capacitance, and the coordinates of each touch point can be calculated.

As shown in FIG. 2, the routing area 102 of the touch panel 100 further includes a first ground line 60 insulated from the plurality of first traces 40 and the plurality of second traces 50. A trace 40, the first ground line 60, and the plurality of second traces 50 are stacked one on top of the other in sequence. The plurality of first traces 40 and the plurality of second traces 50 are respectively connected to the first The ground wires 60 overlap.

Specifically, the plurality of first traces 40 are disposed on a surface of the first substrate 10 away from the insulating layer 20, and the first ground line 60 is disposed on the first substrate 10 and the insulating layer 20. In between, the plurality of second traces 50 are disposed between the insulating layer 20 and the second substrate 30. More specifically, the first ground line 60 is provided on the lower surface 11 of the first substrate 10 facing the second substrate 30.

In this embodiment, the first ground line 60 is used for grounding, and the plurality of first traces 40 and the plurality of second traces 50 are respectively overlapped with the first ground line 60, and the first ground line 60 is used to prevent all The plurality of first traces 40 and the plurality of second traces 50 form a capacitance with each other, thereby effectively avoiding signal interference between the plurality of first traces 40 and the plurality of second traces 50. On the other hand, in this embodiment, the projection of the wiring area of the plurality of first traces 40 on the second substrate 30 does not overlap with the wiring area of the plurality of second traces 50 but is adjacent to the wiring area of the plurality of second traces 50. The projection of the wiring area of the plurality of second traces 50 on the first substrate 10 is close to the wiring area of the plurality of first traces 40. By this setting, the size of the wiring area 102 of the touch panel 100 is effectively reduced, so that The bezel size of the touch panel 100 is small, so that the touch area 101, that is, the display area of the touch panel 100 can be enlarged, which is conducive to the use of the touch panel 100 and other electronic products toward large sizes Show the direction of the window.

Preferably, as shown in FIG. 3, the first ground line 60 surrounds the touch area 101 on the first substrate 10. That is, in this embodiment, not only the plurality of first traces 40 and the plurality of second traces 50 overlap the first ground line 60, but also the plurality of third traces 42 and the plurality of fourth traces 52 are also respectively connected to the first ground line. 60 overlapping. Specifically, the plurality of first traces 40 and the plurality of third traces 42 overlap the first ground line 60, the plurality of second traces 50 and the plurality of fourth traces 52 overlap the first ground line 60, and This setting not only prevents signal interference between the first trace 40 and the second trace 50, but also can be grounded through the first ground line 60 to form an electrostatic discharge path, and then the touch panel 100 Electrostatic injury occurs to achieve the purpose of electrostatic protection. In this embodiment, the first ground line 60 covers all areas of the lower surface 11 of the first substrate 10 corresponding to the routing area 102.

Second embodiment

FIG. 4 is a schematic plan view of a touch panel according to a second embodiment of the present invention. As shown in FIG. 3, the touch panel 200 provided in this embodiment is basically the same as the touch panel 100 in the first embodiment. The panel 200 also defines a touch area 101 and a routing area 102 surrounding the touch area 101. The touch area 101 is provided with a first electrode 41 and a second electrode 51, and the wiring area 102 is provided with a plurality of The first trace 40 and a plurality of second traces 50 are electrically connected to the first electrode 41, and the second trace 50 is electrically connected to the second electrode 51. The touch area 101 is substantially rectangular, and the routing area 102 includes left and right areas located on the left and right sides of the touch area 101, and upper and lower areas located on the upper and lower sides of the touch area 101. The plurality of first traces 40 and the plurality of second traces 50 extend at least in the trace region 102 on the same side of the touch region 101.

Fig. 5 is a schematic cross-sectional view taken along the section line V-V in Fig. 4. As shown in FIG. 5, the touch panel 200 provided in this embodiment also includes a first ground wire 60 that is insulated from the plurality of first traces 40 and the plurality of second traces 50. The line 40, the first ground line 60, and the plurality of second traces 50 are sequentially stacked one above the other, and the plurality of first traces 40 and the plurality of second traces 50 are respectively connected to the first ground line. 60 overlapping. Similarly, the routing area 102 of the touch panel 200 is provided with a first substrate 10, an insulating layer 20, and a second substrate 30 which are sequentially stacked, wherein the plurality of first routing lines 40 are disposed on the first substrate. 10 On a surface far from the insulating layer 20, the first ground line 60 is disposed between the first substrate 10 and the insulating layer 20. More specifically, the first ground line 60 is disposed on the lower surface 11 of the first substrate 10 facing the second substrate 30.

The difference between the touch panel 200 provided in this embodiment and the touch panel 100 in the first embodiment is that in the first embodiment, the plurality of second traces 50 are disposed on the insulating layer 20 and the second substrate. 30; and in this embodiment, the second trace 50 is disposed on a surface of the second substrate 30 away from the insulating layer 20.

Preferably, the touch panel 200 further includes a second ground line 70. The second ground line 70 is disposed between the insulation layer 20 and the second substrate 30. The plurality of first traces 40 and所述 复 The complex The second traces 50 overlap the second ground lines 70, respectively. More specifically, the second ground line 70 is provided on the upper surface 31 of the second substrate 30 facing the first substrate 10.

In this embodiment, the first ground line 60 and the second ground line 70 are used to prevent the plurality of first traces 40 and the plurality of second traces 50 from forming a capacitance with each other, thereby avoiding the plurality of first traces. Signal interference between 40 and plural second traces 50.

Similarly, in this embodiment, the projection of the wiring area of the plurality of first traces 40 on the second substrate 30 does not overlap with the wiring area of the plurality of second traces 50 but is adjacent to the wiring area of the plurality of second traces 50. The projection of the wiring area of the second wiring 50 on the first substrate 10 is close to the wiring area of the plurality of first wirings 40, thereby setting, effectively reducing the size of the wiring area 102 of the touch panel 100, so that the touch The bezel size of the control panel 100 is small, so that the touch area 101, that is, the display area of the touch panel 100 can be enlarged, which is conducive to the use of the touch panel 100 for electronic products such as smartphones, tablets, and the like to display in large sizes The direction of the window.

Preferably, in this embodiment, as shown in FIG. 3, the first ground line 60 surrounds the touch area 101 on the first substrate 10. As shown in FIG. 6, the second ground line 70 surrounds the touch area 101 on the second substrate 30. That is, not only the plurality of first traces 40 and the plurality of second traces 50 overlap with the first ground line 60 and the second ground line 70, but also the plurality of third traces 42 and the plurality of fourth traces 52 also overlap with the first The ground line 60 and the second ground line 70. With this arrangement, not only the signal interference between the first trace 40 and the second trace 50 is prevented, but also the ground can be formed through the first ground line 60 and the second ground line 70 to form an electrostatic discharge path. Furthermore, the touch panel 200 is damaged by static electricity to achieve the purpose of electrostatic protection. In this embodiment, the first ground line 60 covers all areas of the lower surface 11 of the first substrate 10 corresponding to the routing area 102. The second ground line 70 covers all areas of the upper surface 31 of the second substrate 30 corresponding to the routing area 102.

Third embodiment

FIG. 7 is a schematic plan view of a touch panel 300 according to a third embodiment of the present invention. As shown in FIG. 7, the touch panel 300 provided in this embodiment is basically the same as the touch panel 200 in the second embodiment. The touch panel 300 also defines a touch area 101 and a touch area 101 surrounding the touch area 101. A routing area 102. The touch area 101 is provided with a first electrode 41 and a second electrode 51. The routing area 102 is provided with a plurality of first traces 40 and a plurality of second traces 50. The trace 40 is electrically connected to the first electrode 41, and the plurality of second traces 50 are electrically connected to the second electrode 51. The touch area 101 is substantially rectangular, and the routing area 102 includes left and right areas located on the left and right sides of the touch area 101, and upper and lower areas located on the upper and lower sides of the touch area 101. The plurality of first traces 40 and the plurality of second traces 50 extend at least in the trace region 102 on the same side of the touch region 101.

The difference between the touch panel 300 provided in this embodiment and the touch panel 200 in the second embodiment is that in the second embodiment, the wiring area of the plurality of first traces 40 is not the same as the wiring of the plurality of second traces 50. The areas overlap but are adjacent to the wiring areas of the plurality of second traces 50; in this embodiment, the wiring areas of the plurality of first traces 40 and the wiring areas of the plurality of second traces 50 overlap. Specifically, each of the first traces 40 is respectively located between two adjacent second traces 50; each of the second traces 50 is respectively located between two adjacent first traces 50 Between lines 40.

FIG. 8 is a schematic cross-sectional view taken along the section line Ⅷ-Ⅷ in FIG. 7. As shown in FIG. 8, in this embodiment, a projection of each of the first traces 40 on the second substrate 30 is located between two adjacent second traces 50; The projection of the second trace 50 on the first substrate 10 is located between two adjacent first traces 40. Therefore, the wiring space of the routing area 102 of the touch panel 300 provided in this embodiment can be further reduced, and the frame size thereof can be further narrowed.

Similarly, preferably, in this embodiment, as shown in FIG. 3, the first ground line 60 surrounds the touch area 101 on the first substrate 10. More specifically, the first ground line 60 is disposed on the first substrate. 10 faces the lower surface 11 of the second substrate 30. As shown in FIG. 6, the second ground line 70 surrounds the touch area 101 on the second substrate 30. More specifically, the second ground line 70 is provided on the upper surface 31 of the second substrate 30 facing the first substrate 10. That is, not only the plurality of first traces 40 and the plurality of second traces 50 overlap the first ground line 60 and the second ground line 70, but also the plurality of third traces 42 and the plurality of fourth traces 52 also overlap with the first A ground line 60 and a second ground line 70 overlap. With this arrangement, not only the signal interference between the first trace 40 and the second trace 50 is prevented, but also the ground can be formed through the first ground line 60 and the second ground line 70 to form an electrostatic discharge path. Furthermore, the touch panel 200 is damaged by static electricity to achieve the purpose of electrostatic protection. In this embodiment, the first ground line 60 covers all areas of the lower surface 11 of the first substrate 10 corresponding to the routing area 102. The second ground line 70 covers all areas of the upper surface 31 of the second substrate 30 corresponding to the routing area 102.

An embodiment of the present invention further provides a touch display device 500. As shown in FIG. 9, the touch display device 500 includes a display panel 400 and a touch panel 100 (200, 300) disposed on the display panel 400. The touch panel 100 (200, 300) may be any one of the touch panels in the above embodiments.

In addition, the display panel 400 may be a liquid crystal display panel. When the display panel 400 is a liquid crystal display panel, the display panel 400 may be combined with a backlight module (not shown) to form a liquid crystal display module. The display panel 400 is disposed between the backlight module and the touch panel 100 ( 200, 300). In addition, the display panel 400 may also be an organic light emitting diode (Organic Light Emitting Diode, OLED) display panel, and the embodiment of the present invention does not limit the type of the display panel.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced. Without departing from the spirit of the technical solution of the present invention And scope.

Claims (8)

A touch panel defines a touch area and a routing area surrounding the touch area, the touch area is provided with a plurality of first electrodes and a plurality of second electrodes, and the wiring area is provided with a plurality of first And a plurality of second traces, the plurality of first traces are electrically connected to the first electrode, the plurality of second traces are electrically connected to the second electrode, and the touch panel further includes The plurality of first traces and the plurality of second traces are insulated from each other. The improvement is that the plurality of first traces, the first ground line, and the plurality of second traces are up and down. The plurality of first traces and the plurality of second traces overlap with the first ground line, respectively, and the plurality of first traces and the plurality of second traces do not overlap. The touch panel according to claim 1, wherein the plurality of first traces and the plurality of second traces extend at least in a trace area on the same side of the touch area. The touch panel according to claim 2, wherein the touch panel further includes a first substrate, an insulating layer, and a second substrate that are sequentially stacked, and the plurality of first traces are disposed away from the first substrate. On the surface of the insulating layer, the first ground line is disposed between the first substrate and the insulating layer, and the plurality of second traces are disposed between the insulating layer and the second substrate. . The touch panel according to claim 2, wherein the touch panel further includes a first substrate, an insulating layer, and a second substrate that are sequentially stacked, and the plurality of first traces are disposed away from the first substrate. On the surface of the insulating layer, the first ground line is disposed between the first substrate and the insulating layer, and the plurality of second traces are disposed on a surface of the second substrate away from the insulating layer. on. The touch panel according to claim 4, wherein the touch panel further includes a second ground line disposed between the insulation layer and the second substrate, and the plurality of first ground lines A trace and the plurality of second traces respectively overlap the second ground line. The touch panel according to claim 5, wherein the projection of each first trace on the second substrate is located between two adjacent second traces; each second trace is at The projections on the first substrate are located between two adjacent first traces. The touch panel according to any one of claims 3 to 6, wherein a material of the insulating layer is a transparent optical glue. A touch display device includes a display panel and a touch panel disposed on the display panel, and the touch panel is the touch panel according to any one of claims 1 to 7.