CN213958035U - Touch panel and touch display device - Google Patents

Abstract

The application provides a touch panel and a touch display device, wherein the touch panel is provided with a touch area, the touch panel comprises at least two first-class electrode layers which are arranged in a stacked mode, the first-class electrode layers comprise first-class touch induction areas, the first-class touch induction areas respectively comprise the at least two first-class electrode layers and are spliced and filled in the touch area, and the first-class touch induction areas comprise a plurality of first-class electrodes extending along a first direction; the first-class electrode layer further comprises a first peripheral line area adjacent to the touch area, wherein the first peripheral line area comprises a plurality of first signal leads, one ends of the first signal leads are electrically connected with the first-class electrodes, and the first signal leads are distributed on at least one side of the first peripheral line area. According to the touch panel and the touch control method, the electrodes of one type are arranged on different layers, the number of signal leads corresponding to each layer of electrodes is reduced, and the edge width of the whole touch panel is further reduced.

Description

Touch panel and touch display device

Technical Field

The application relates to the technical field of touch control, in particular to a touch panel and a touch display device.

Background

In general, a plurality of signal leads need to be arranged on the edge of the touch panel to ensure that the electrodes in the touch circuit are electrically connected with other electronic components. However, the signal leads have a problem that the peripheral wiring area of the touch panel occupies a large margin.

SUMMERY OF THE UTILITY MODEL

In view of this, embodiments of the present disclosure provide a touch panel and a touch display device, which can reduce the width of the peripheral circuit area.

In a first aspect, the present application provides a touch panel, which has a touch area, and includes at least two first-type electrode layers stacked on each other, where the first-type electrode layers include first-type touch sensing areas, and the first-type touch sensing areas included in the at least two first-type electrode layers are spliced and filled in the touch area, where the first-type touch sensing areas include a plurality of first-type electrodes extending along a first direction; the first-class electrode layer further comprises a first peripheral line area adjacent to the touch area, wherein the first peripheral line area comprises a plurality of first signal leads, one ends of the first signal leads are electrically connected with the first-class electrodes, and the first signal leads are distributed on at least one side of the first peripheral line area.

In an embodiment of the present application, the plurality of first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type of touch sensing area, the first side is provided with a line concentration portion, and the other ends of the plurality of first signal leads are collected at least one line concentration portion.

In an embodiment of the present application, the plurality of first signal leads are distributed on a first side and a second side of the first peripheral circuit area, which are adjacent to the first type of touch sensing area, wherein the first side and the second side are both provided with a wire collecting portion, and the other ends of the plurality of first signal leads are collected at the wire collecting portion.

In an embodiment of the present application, the plurality of first-type electrodes are patterned metal mesh electrodes, and the plurality of first-type electrodes included in each of the at least two first-type electrode layers adopt a non-identical polygonal metal mesh pattern.

In an embodiment of the application, the touch panel further includes at least two second electrode layers stacked on each other, where the second electrode layers include a second touch sensing area, and the second touch sensing areas included in the at least two second electrode layers are spliced and filled in the touch area, where the second touch sensing area includes a plurality of second electrodes extending along a second direction; the second electrode layer further comprises a second peripheral circuit area adjacent to the touch area, wherein the second peripheral circuit area comprises a plurality of second signal leads, one ends of which are electrically connected with the second electrodes, and the second signal leads are distributed on at least one side of the second peripheral circuit area.

In an embodiment of the present invention, the plurality of second signal leads are distributed on a fourth side of the second peripheral circuit area adjacent to the second type of touch sensing area, the fourth side is provided with a line concentration portion, and the other ends of the plurality of second signal leads are collected in at least one line concentration portion; or the plurality of second signal leads are distributed on the first side and the fourth side of the second peripheral line area, which are adjacent to the second type touch sensing area, the first side and the fourth side are provided with a line concentration part, and the other ends of the plurality of second signal leads are collected at the line concentration part.

In an embodiment of the present application, the plurality of second-type electrodes are patterned metal mesh electrodes, and the plurality of second-type electrodes included in each of the at least two second-type electrode layers adopt a non-identical polygonal metal mesh pattern.

In an embodiment of the present application, the number of layers of the first type electrode layer is two, and the number of layers of the second type electrode layer is two.

In an embodiment of the present application, the first electrode layer is a driving electrode layer, and the second electrode layer is a sensing electrode layer; or the first electrode layer is an induction electrode layer, and the second electrode layer is a driving electrode layer.

In a second aspect, the present application provides a touch display device, including: a display screen; and the touch panel of the first aspect.

The embodiment of the application provides a touch panel and a touch display device, and one type of electrodes are arranged on different layers, so that the number of signal leads corresponding to each layer of electrodes is reduced, the width of a peripheral circuit area can be reduced, and the edge width of the whole touch panel is reduced. Meanwhile, one type of electrodes in the touch electrodes are arranged in different layers, so that the distances from the touch capacitive unit to the fingers at different positions in the touch area are not completely the same, and the distances between the two electrodes forming the capacitive unit are not completely the same, so that when the fingers touch different positions, the sensing signals are not completely the same, thereby assisting in distinguishing the touch positions and improving the identification degree of the signals.

Drawings

Fig. 1 is a schematic structural diagram of a top view of a touch panel according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a top view of a touch panel according to another embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a top view of a touch panel according to yet another embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a patterned metal grid electrode according to an embodiment of the present disclosure.

Fig. 5 is a schematic structural diagram of a patterned metal grid electrode according to another embodiment of the present application.

Fig. 6 is a schematic structural diagram of a patterned metal grid electrode according to yet another embodiment of the present application.

Fig. 7 is a schematic structural diagram of a top view of a touch panel according to still another embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of a top view of a touch panel according to still another embodiment of the present disclosure.

Fig. 9 is a schematic structural diagram illustrating an electrode arrangement in a top view of a touch panel according to an embodiment of the present disclosure.

Fig. 10 is a schematic structural diagram of a three-dimensional structure of a touch panel according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a three-dimensional structure of a touch panel according to another embodiment of the present application.

Fig. 12 is a schematic structural diagram of a top view of a touch panel according to still another embodiment of the present disclosure.

Fig. 13 is a schematic structural diagram of a main viewing angle of a touch display device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Fig. 1 is a schematic structural diagram of a top view of a touch panel according to an embodiment of the present disclosure. As shown in fig. 1, a touch panel provided in the embodiment of the present application has a touch area, and the touch panel includes: two first type electrode layers, such as one first type electrode layer 1 (i.e., first type electrode layer 1 in (a)) and another first type electrode layer 2 (i.e., first type electrode layer 2 in (b)) in fig. 1, are stacked. The first electrode layer 1 and the first electrode layer 2 each include a first touch sensing area. The first-type touch sensing areas respectively included by the two first-type electrode layers are spliced and filled with the touch areas of the touch panel. The first-type touch sensing area includes a plurality of first-type electrodes 11 (or 21) extending in the first direction a. The first-type electrode layer 1 further includes a first peripheral circuit region (i.e., a portion between a frame of the first-type electrode layer 1 and a dashed line frame in fig. (a)) adjacent to the touch region, wherein the first peripheral circuit region includes a plurality of first signal leads 12 (or 22) having one ends electrically connected to the plurality of first-type electrodes 11 (or 21). The first signal leads 11 (or 22) are distributed on at least one side of the first peripheral circuit region.

Specifically, the top view direction shown in fig. 1 is a direction perpendicular to the touch panel from top to bottom. The number of the first electrode layers stacked is not limited to two layers mentioned in the embodiments of the present application, and may be three, four or more layers, which is not specifically limited in the embodiments of the present application.

The first direction a and the second direction B are perpendicular to each other, and the first direction a or the second direction B may be an X-axis direction (transverse direction) or a Y-axis direction (longitudinal direction) of a two-dimensional rectangular coordinate system, that is, when the first direction a is the X-axis direction (transverse direction), the second direction B is referred to as the Y-axis direction (longitudinal direction), and when the first direction a is the Y-axis direction (longitudinal direction), the second direction B is referred to as the X-axis direction (transverse direction).

With continued reference to fig. 1, the two first electrode layers may be stacked by stacking the first electrode layer 1 in (a) and the first electrode layer 2 in (b). In the first-type electrode layer 1, the first-type touch sensing area may be formed by combining a plurality of first-type electrodes 11 extending along the first direction a, and fills the upper half portion of the touch area of the entire touch panel, and any two adjacent first-type electrodes 11 are not connected to each other. In the first electrode layer 2, the first touch sensing area may also be formed by combining a plurality of first electrodes 21 extending along the first direction a, and fills a lower half portion of the touch area of the entire touch panel, and any two adjacent first electrodes 21 are not connected to each other. After the first electrode layers 1 and 2 are overlapped, the first touch sensing area formed by combining the plurality of first electrodes 11 and the first touch sensing area formed by combining the plurality of first electrodes 21 can be spliced and filled. Or, the plurality of first type electrodes 11 and the plurality of first type electrodes 21 are not overlapped and just fill the whole touch area.

The touch area may be a central area of the touch panel, which is equal to a display area of the touch screen. The touch area can also be understood as an area formed by combining a plurality of first-type touch sensing areas.

The first-type touch-sensing area may include a plurality of first-type electrodes (e.g., the first-type electrodes 11 or the first-type electrodes 21 shown in fig. 1) parallel to the first direction a. The first-type touch sensing area may also include a plurality of first-type electrodes (e.g., the first-type electrodes 11 or the first-type electrodes 21 shown in fig. 2) that form a certain angle with the first direction a. Moreover, the sizes of the first type touch sensing areas included in the two first type electrode layers may be equal (i.e., the touch sensing areas are equally divided, see fig. 1), or may be unequal. In addition, the shape of the first type of touch-sensing area may be rectangular (e.g., fig. 1), trapezoidal (e.g., fig. 2), triangular, or other polygonal shape. The size, shape and composition form of the first type of touch sensing area are not particularly limited in the embodiments of the present application.

It should be understood that fig. 2 also comprises two first type electrode layers, i.e. the first type electrode layer 1 in fig. (a) and the first type electrode layer 2 in fig. (b), as many as the first type electrode layers shown in fig. 1. (a) The middle first electrode layer 1 includes a first touch sensing area formed by a plurality of first electrodes 11 having a certain included angle with the first direction a, and a plurality of metal leads 12 electrically connected to the plurality of first electrodes 11. (b) The first-type electrode layer 2 also includes a first-type touch sensing area formed by a plurality of first-type electrodes 21 having a certain included angle with the first direction a, and a plurality of metal leads 22 electrically connected to the plurality of first-type electrodes 21. Moreover, all the touch areas can be spliced and filled based on the first-type touch sensing area formed by combining the plurality of first-type electrodes 11 and the first-type touch sensing area formed by combining the plurality of first-type electrodes 21.

In an example, the first type electrode layer may be either a drive electrode layer or a sense electrode layer. Illustratively, for example, the first electrode layer is a driving electrode layer and the first electrode is a driving electrode, or the first electrode layer is a sensing electrode layer and the first electrode is a sensing electrode.

The first electrode layer also comprises a first peripheral circuit area. The first peripheral line region is a portion between the frame of the first-type electrode layer 1 and the dashed line frame in fig. (a), and the first peripheral line region is a portion between the frame of the first-type electrode layer 2 and the dashed line frame in fig. (b). The first peripheral circuit region further includes a plurality of first signal leads 12 (or 22), and the plurality of first-type electrodes 11 are electrically connected to the plurality of signal leads 12, respectively. A first-type electrode 11 is electrically connected to a first signal lead 12 (or a first-type electrode 21 is electrically connected to a first signal lead 22), so that a plurality of first signal leads 12 are formed to be gathered in a certain area of at least one side surface (which may be an upper side, a lower side, a left side or a right side of the touch panel) of the first peripheral circuit area to be connected to the touch chip, thereby connecting the first-type electrode 11 to the touch chip.

In an embodiment, referring to fig. 1, the first signal leads 12 may be distributed on a first side and a second side of the first peripheral circuit region adjacent to the first type of touch sensing region, wherein the first side and the second side are both provided with a wire collecting portion, and the other ends of the first signal leads are collected at the wire collecting portion.

In an embodiment, referring to fig. 2, the plurality of first signal leads 12 may be distributed on a first side of the first peripheral circuit region adjacent to the first type of touch sensing region, the first side is provided with a line concentration portion, and the other ends of the plurality of first signal leads are collected in at least one line concentration portion.

It should be noted that, the plurality of first signal leads may also be distributed on three or four sides of the first peripheral circuit region, which is not specifically limited in this application. For details of the arrangement of the first signal lead, please refer to the following description of the embodiments, which is not repeated herein to avoid repetition.

It is further noted that the plurality of first signal leads 12 may be a plurality of metal leads. The width of the first signal leads can be 4-15 μm, and the material can be silver, copper or nano-scale conductive powder (powder particles are 10-100 nm). The plurality of first signal leads 12 may be formed by any one of screen printing, laser etching, and 3D printing.

The two first electrode layers stacked may be attached to each other by an OCA optical adhesive. Or the two first-class electrode layers which are stacked take the substrate as a carrier, and the two first-class electrode layers are respectively positioned on the upper surface and the lower surface of the substrate.

Therefore, according to the touch panel and the touch panel, the electrodes of one type are arranged on different layers, the number of signal leads corresponding to each layer of electrodes is reduced, the width of a peripheral circuit area can be reduced, and the edge width of the whole touch panel is reduced. Meanwhile, one type of electrodes in the touch electrodes are arranged in different layers, so that the distances from the touch capacitive unit to the fingers at different positions in the touch area are not completely the same, and the distances between the two electrodes forming the capacitive unit are not completely the same, so that when the fingers touch different positions, the sensing signals are not completely the same, thereby assisting in distinguishing the touch positions and improving the identification degree of the signals.

In an embodiment of the present application, the plurality of first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type of touch sensing area, the first side is provided with a line concentration portion, and the other ends of the plurality of first signal leads are collected in at least one line concentration portion.

Specifically, referring to fig. 3, the first-type electrode layer 1 (or 2) includes a first side (e.g., the first side may be the left side of the orientation shown in fig. 3), a second side (e.g., the second side may be the upper side of the orientation shown in fig. 3), a third side (e.g., the third side may be the right side of the orientation shown in fig. 3), and a fourth side (e.g., the fourth side may be the lower side of the orientation shown in fig. 3) which are adjacent in sequence, wherein the first side and the third side are opposite, and the second side and the fourth side are opposite. And the first-type touch sensing area includes a plurality of first-type electrodes 11 (or 21) extending from the first side to the third side (i.e., the first direction a).

The two stacked first-type electrode layers each include a first peripheral line region (i.e., a portion between a frame and a dotted line frame of the first-type electrode layer 1 (or 2) in fig. (a) or (b)) and a first-type touch sensing region. The first peripheral circuit region includes a plurality of first signal leads 12 (or 22). The first signal leads 12 (or 22) are collected at a first side or a third side of the first peripheral circuit area near one end of the first type of touch sensing area. The first side (or the third side) of the first peripheral line region is provided with a line concentration part. The line concentration part can be a concentration part of a plurality of signal leads on the first side, one end of each first signal lead is electrically connected with the plurality of first electrodes, and the other end of each first signal lead is concentrated on the line concentration part and connected with the touch control chip. The specific distribution positions of the plurality of first signal leads are not particularly limited, and the first signal leads can be flexibly arranged according to actual conditions.

There may be 1 line concentration part, which is located in the middle of the first type of touch sensing area, for example, in fig. 3 and fig. 12 (a), the first signal lead 12 is converged at the middle of the first side (i.e., left side) of the first type of touch sensing area. The number of the line concentration parts may be 2, 3, 4, or the like, and the number of the line concentration parts is not particularly limited in the embodiments of the present application. The plurality of line concentration parts can be distributed on the same side or on multiple sides of the first peripheral line area; each lead may be evenly distributed and collected to a plurality of concentration portions. For example, both of the two line concentration portions may be disposed on the first side, or may be disposed on the first side and the second side (i.e., the left side and the upper side of the first type of touch sensing area in (a)) as indicated by the first signal quotation marks 12 in (a) of fig. 1 and 7, respectively.

Illustratively, the outgoing mode of the signal leads of the two stacked first-type electrode layers is single-side concentrated outgoing. That is, the signal leads in the two electrode layers are all led out from the first side or the third side, and may also be led out from the second side or the fourth side, which is not specifically limited in this application.

Therefore, the first-type electrodes are arranged on at least two layers, so that the number of signal leads corresponding to each layer is reduced. Meanwhile, a single-side wire outlet mode is adopted, and compared with the non-layered electrode layer in the prior art, the edge width of the whole touch panel is further reduced.

In an embodiment of the present application, the plurality of first signal leads are distributed on a first side and a second side of the first peripheral circuit area, which are adjacent to the first type of touch sensing area, wherein the first side and the second side are both provided with a wire collecting portion, and the other ends of the plurality of first signal leads are collected at the wire collecting portion. For example the second side may be the upper side of the orientation shown in figure 7.

Specifically, referring to fig. 1, the first-type electrode layer 1 (or 2) includes a first side, a second side, a third side, and a fourth side, which are adjacent in sequence, wherein the first side and the third side are opposite, and the second side and the fourth side are opposite. And a plurality of first type electrodes 11 (or 21) included in the first type touch sensing area extend from the first side to the third side (i.e. the first direction a).

The two stacked first-type electrode layers each include a first peripheral line region (i.e., a portion between a frame and a dotted line frame of the first-type electrode layer 1 (or 2) in fig. (a) or (b)) and a first-type touch sensing region. The first peripheral circuit region includes a plurality of first signal leads 12 (or 22). The first signal leads 12 (or 22) are collected at the first side and the second side of the first peripheral circuit area near one end of the first type of touch sensing area. The first side and the second side of the first peripheral line area are provided with line concentration parts. The line concentration part can be a concentration part of a plurality of first signal leads on the first side and the second side, one end of each of the plurality of first signal leads is electrically connected with the plurality of first electrodes, and the other end of each of the plurality of first signal leads is concentrated on the line concentration part and connected with the touch control chip.

The arrangement may be that the plurality of first type electrodes 11 (or 21) are divided into two groups based on a symmetry axis parallel to the direction a in the first type touch sensing area, one group of the plurality of first type electrodes 11 collects the plurality of first signal leads 12 connected thereto at the line concentration portion on the second side, and the other group of the plurality of first type electrodes 11 collects the plurality of first signal leads 12 connected thereto at the line concentration portion on the first side, for example, the distribution of the leads in fig. 1 (a).

Alternatively, one group of the plurality of first type electrodes 21 collects the plurality of first signal leads 22 connected thereto at the line concentration portion on the fourth side, and another group of the plurality of first type electrodes 21 collects the plurality of first signal leads 22 connected thereto at the line concentration portion on the first side, for example, the lead arrangement in fig. 1(b), and the specific form of the lead arrangement is not limited in the embodiment of the present application.

There may be 2 (for example, fig. 1 and 7), 3, 4, and the like, and the number of the line concentration portions is not particularly limited in the embodiments of the present application. The plurality of line concentration parts can be distributed on the same side or on multiple sides of the first peripheral line area. For details, please refer to the descriptions of the above embodiments, which are not repeated herein to avoid repetition.

In the above embodiment, the plurality of first-type electrodes are grouped based on the symmetry axis, but the actual division manner may be as follows: 2 or 1: 3, etc., and the embodiments of the present application are not particularly limited thereto. The first-type electrodes may also be divided into three groups, four groups, and the like, which is not specifically limited in this embodiment of the application.

Therefore, the first-type electrodes are arranged into at least two layers, so that the number of signal leads corresponding to each layer is reduced. Meanwhile, the mode of outgoing lines at two sides is adopted, and compared with the mode of outgoing lines at a single side, the edge width of the whole touch panel is further reduced.

In an embodiment of the present application, the plurality of first-type electrodes are patterned metal mesh electrodes, and the plurality of first-type electrodes included in each of the at least two first-type electrode layers adopt a non-identical polygonal metal mesh pattern.

Specifically, the material of the metal grid electrode may be at least one of Cu, Ag, Al, Ti, or Ni, and the grid pattern of the metal grid layer may be rectangular, square, diamond, or other polygonal shapes, which is not limited in this embodiment. In addition, although the metal wires in the metal mesh are opaque to light, the metal wires cannot be felt by human vision due to the thin metal wires, that is, the metal mesh is transparent in human vision, and does not affect the transparency of the entire touch panel.

In one embodiment, the first-type electrodes included in each of the at least two first-type electrode layers are in a non-identical polygonal metal mesh pattern.

The polygonal metal mesh pattern may be an irregular polygonal metal mesh pattern. The irregular polygon may be a non-regular polygon, i.e. the length of at least one side of the polygon is not equal to the length of the other sides, such as fig. 4; or may be a polygon in which at least one side is a curve or a broken line, such as fig. 5; or the included angles inside the polygons are different, for example, the angle of the included angle formed by any two adjacent sides in each polygon is configured in a random number manner within a proper angle range, and the proper angle range can be set to be 75-125 degrees; or at least part of the metal lines in the patterned metal grid electrode are non-linear, such as in fig. 6 (the dotted lines indicate the arrangement of the metal lines), the application does not specifically limit the irregular polygon pattern.

The non-identical polygonal metal mesh patterns mentioned herein may refer to at least one of different included angles, different side lengths, and different degrees of bending of the sides of the polygons. That is, it is sufficient to ensure that the patterns of the first-type electrode layers are different from each other. Even if each layer is an irregular polygonal metal mesh pattern, the pattern is different between layers. For example, two first electrode layers are included, wherein the side length of the polygonal metal mesh pattern of one first electrode layer is different from that of the polygonal metal mesh pattern of the other first electrode layer. For another example, the electrode layer comprises two first electrode layers, wherein the edge bending degree of the polygonal metal mesh pattern of one first electrode layer is different from the edge bending degree of the polygonal metal mesh pattern of the other first electrode layer.

According to the touch panel, at least two first-type electrode layers are arranged to be the patterned metal grid electrodes through the thin metal wires, and therefore light transmittance of the touch panel is improved.

Therefore, in the embodiment of the application, the at least two first electrode layers are arranged as the metal grid electrodes with different patterns, so that interference fringes are avoided, and the distinguishable characteristics of signals are increased.

Fig. 7 is a schematic structural diagram of a top view of a touch panel according to still another embodiment of the present disclosure. The embodiment shown in fig. 7 is extended over the embodiment shown in fig. 1, and the differences between the embodiment shown in fig. 7 and the embodiment shown in fig. 1 will be emphasized.

As shown in fig. 7, the touch panel has a touch area, and includes: two first electrode layers and two second electrode layers are stacked. The number of the first electrode layers is two, namely a first electrode layer 1 and another first electrode layer 2; the number of the second electrode layers is two, namely one second electrode layer 3 and the other second electrode layer 4. The second type electrode layers 3 (or 4) respectively comprise a second type touch sensing area. And the second type touch sensing areas respectively included by the two second type electrode layers are spliced and filled in all the touch areas. The first-type touch sensing areas respectively included by the two first-type electrode layers are spliced and filled with all the touch areas. The second type touch sensing area includes a plurality of second type electrodes 31 (or 41) extending along the second direction B. The second type electrode layer 3 further includes a second peripheral circuit region (i.e., a portion between the frame of the second type electrode layer 3 and the dashed line frame in fig. c) adjacent to the touch region, wherein the second peripheral circuit region includes a plurality of second signal leads 32 (or 42) having one end electrically connected to the plurality of second type electrodes 31 (or 41). The plurality of second signal leads 32 (or 42) are disposed on at least one side of the second peripheral circuit region.

Specifically, the top view direction shown in fig. 7 is a direction perpendicular to the touch panel from top to bottom. The number of the first electrode layer and the second electrode layer stacked in this embodiment is not limited to two layers mentioned in the embodiment of the present application, and may be three, four or more layers, which is not specifically limited in the embodiment of the present application.

As shown in fig. 7(c), in the second-type electrode layer 3, the second-type touch sensing area refers to a touch area formed by combining a plurality of second-type electrodes 31 extending along the second direction B, the left half portion of the touch area of the entire touch panel is filled, and any two adjacent second-type electrodes 31 are not connected to each other. As shown in fig. 7(d), in the second-type electrode layer 4, the second-type touch sensing area refers to a touch area formed by combining a plurality of second-type electrodes 41 extending along the second direction B, and fills a right half of the touch area of the entire touch panel, and any two adjacent second-type electrodes 41 are not connected to each other. After the second electrode layers 3 and 4 are stacked, the second touch sensing area formed by combining the plurality of second electrodes 31 and the second touch sensing area formed by combining the plurality of second electrodes 41 can be spliced and completely filled in the touch area of the touch panel.

The touch area may be a central area of the touch panel, which is equal to a display area of the touch screen. The touch area can be understood as an area formed by combining a plurality of second-type touch sensing areas.

The second-type touch sensing area may include a plurality of second-type electrodes 31 (or 41) parallel to the second direction B, or may include a plurality of second-type electrodes (e.g., the second- type electrodes 31 or 41 in fig. 8) having a certain angle with the second direction B. The sizes of the second-type touch sensing areas included in the two second-type electrode layers may be equal (i.e., the touch sensing areas are equally divided), or may not be equal, and the shape of the second-type touch sensing area may be a rectangle (e.g., fig. 7), a trapezoid (e.g., fig. 8), a triangle, or another polygon. The size, shape and composition form of the second type of touch sensing area are not particularly limited in the embodiments of the present application.

It should be understood that the touch panel shown in fig. 8 includes the same number of electrode layers as the touch panel shown in fig. 7, and each of the electrode layers includes two first-type electrode layers and two second-type electrode layers stacked one on another. In fig. 8, two first type electrode layers, one being the first type electrode 1 in (a) and the first type electrode 2 in (b). Two second type electrode layers, one is the second type electrode 3 in (c) and the second type electrode 4 in (d). The first electrode layer 1 in (a) includes a first touch sensing area formed by a plurality of first electrodes 11 having a certain included angle with the first direction a, and a plurality of metal leads 12 electrically connected to the plurality of first electrodes 11. (b) The first-type electrode layer 2 also includes a first-type touch sensing area formed by a plurality of first-type electrodes 21 having a certain included angle with the first direction a, and a plurality of metal leads 22 electrically connected to the plurality of first-type electrodes 21. (c) The middle second electrode layer 3 includes a second touch sensing area formed by a plurality of second electrodes 31 having a certain included angle with the second direction B, and a plurality of metal leads 32 electrically connected to the plurality of second electrodes 31. (d) The middle second electrode layer 4 also includes a second touch sensing area formed by a plurality of second electrodes 41 having a certain included angle with the second direction B, and a plurality of metal leads 42 electrically connected to the plurality of second electrodes 41. The touch area is spliced based on the first electrode layer 1 (or 2) and the second electrode layer 3 (or 4) and completely fills the area

Examples of the lamination of the first-type electrode layer and the second-type electrode layer included in the touch panel are given below with reference to fig. 9 to 11.

Referring to fig. 9, the touch area is completely filled with the first-type electrode layer and the second-type electrode layer, or the first- type electrodes 11 and 21 extending along the first direction are not overlapped and fill exactly the entire touch area, and the second- type electrodes 31 and 41 extending along the second direction are also not overlapped and fill exactly the entire touch area. That is, any region of the touch area is corresponding to a first electrode layer and a second electrode layer for signal sensing, and due to the height difference between the electrode layers, the sensed signals of the electrode layers are different, so as to improve the signal identification degree.

In one embodiment, the number of the first electrode layer is two, and the number of the second electrode layer is one, or the number of the first electrode layer is one, and the number of the second electrode layer is two.

In one embodiment, the number of the first electrode layers is two, and the number of the second electrode layers is two.

The stacking order between the first-type electrode layer and the second-type electrode layer may be various. As shown in fig. 7, the four electrode layers with reference numbers 1-4 respectively may be stacked in the vertical direction of the touch panel in the order of 1, 2, 3 and 4, for example, as shown in fig. 10. One first electrode layer 1 is adhered to the other first electrode layer 2 through a first optical adhesive layer 71, the first electrode layer 2 is adhered to one second electrode layer 3 through a second optical adhesive layer 72, and the second electrode layer 3 is adhered to the other second electrode layer 4 through a third optical adhesive layer 73.

For another example, as shown in fig. 7, four electrode layers with reference numbers 1 to 4 respectively may be stacked in the order of 1, 3, 4 and 2 in the vertical direction of the touch panel, for example, as shown in fig. 11, wherein one first electrode layer 1 is bonded to one second electrode layer 3 through a first optical adhesive layer 74, the second electrode layer 3 is bonded to another second electrode layer 4 through a second optical adhesive layer 75, and the second electrode layer 4 is bonded to another first electrode layer 2 through a third optical adhesive layer 76.

In addition, as shown in fig. 7, the four electrode layers with reference numbers 1 to 4 respectively may also be stacked in the vertical direction of the touch panel in the order of 1, 3, 2, and 4, or 3, 2, 1, and 4, and the arrangement order of the electrode layers in the vertical direction is not specifically limited in the embodiments of the present application.

In an example, the touch panel is formed by pasting two layers of metal grid electrodes through an optical adhesive layer. Here, the structure is not limited to the double-layer metal mesh electrode, and the double-layer metal mesh electrode is only one way of combining four electrode layers.

For example, with continued reference to fig. 7, the first electrode layer 1 in (a) and the second electrode layer 3 in (c) form a two-layer metal grid electrode, and the first electrode layer 2 in (b) and the second electrode layer 4 in (d) form another two-layer metal grid electrode, which are adhered together by an optical adhesive layer. Or the first electrode layer 1 in (a) and the first electrode layer 2 in (b) form a double-layer metal grid electrode, and the second electrode layer 3 in (c) and the second electrode layer 4 in (d) form another double-layer metal grid electrode, which are adhered through an optical adhesive layer. Or the first electrode layer 1 in (a) and the second electrode layer 4 in (d) form a double-layer metal grid electrode, the second electrode layer 3 in (c) and the first electrode layer 2 in (b) form another double-layer metal grid electrode, and the two double-layer metal grid electrodes are adhered through an optical adhesive layer.

In one example, the two-layer double-layer metal grid electrode also comprises a substrate. The first substrate is equivalent to a carrier plate of two first electrode layers. The second substrate is equivalent to the carrier plate of the two second electrode layers. The first substrate and the second substrate may be prepared by a photolithography process, or may be prepared by a sputtering process.

In an example, an electrode layer may also be disposed on a surface (e.g., a lower surface) of the cover plate away from the touch panel. The other two electrode layers are respectively arranged on the upper surface and the lower surface of the first substrate. And the last electrode layer is arranged on the upper surface of the second substrate, and then the cover plate, the first substrate and the second substrate are adhered through OCA glue.

In one example, the two-layer double-layer metal grid electrode also comprises an optical glue layer. Illustratively, the number of optical glue layers is three. And the first optical adhesive layer is used for adhering two electrode layers in the double-layer metal grid electrode. And the second optical adhesive layer is used for adhering two electrode layers in the other double-layer metal grid electrode. And the third optical adhesive layer is used for adhering the two layers of double-layer metal grid electrodes.

In one embodiment, the first electrode layer is a driving electrode layer, and the second electrode layer is a sensing electrode layer; or the first electrode layer is an induction electrode layer, and the second electrode layer is a driving electrode layer.

It should be noted that, besides the aforementioned metal grid electrode, the plurality of first-type electrodes and the plurality of second-type electrodes described in the present application may also be indium tin oxide electrodes, i.e., ITO electrodes. In view of the practical application, the metal mesh electrode and the ITO electrode each have advantages and disadvantages, that is, the ITO electrode has good transparency but high impedance, and the metal mesh electrode has low impedance but low transmittance, so the plurality of first electrodes and the plurality of second electrodes may be made of different materials, for example, the first electrodes are metal mesh electrodes, and the second electrodes are ITO electrodes. However, it should be noted that the embodiments of the present application do not limit what specific materials the plurality of first-type electrodes and the plurality of second-type electrodes are respectively made of, as long as the above-mentioned disadvantages can be avoided.

With continued reference to fig. 7, the touch panel further includes a second peripheral circuit area. The second peripheral line region is a portion between the frame of the second electrode layer 31 (or 41) and the dashed frame in fig. c (or fig. d). The second peripheral circuit region further includes a plurality of second signal leads 32 (or 42), and the plurality of second electrodes 31 are electrically connected to the plurality of second signal leads 32, respectively. A second-type electrode 31 is electrically connected to a second signal lead 32 (or a second-type electrode 41 is electrically connected to a second signal lead 42), and thus a plurality of second signal leads 42 are formed to be gathered in a certain area of at least one side surface (which may be an upper side, a lower side, a left side or a right side of the touch panel) of the second peripheral circuit area to be connected to the touch chip, so as to connect the second-type electrode 31 (or 41) to the touch chip.

In an embodiment, referring to fig. 7, the second signal leads 32 may be distributed on a first side (or a third side) and a fourth side (e.g., fig. 7) of the second peripheral circuit region adjacent to the second type of touch sensing region. Alternatively, the second signal leads 32 may be distributed on a fourth side of the second peripheral circuit region adjacent to the second type of touch sensing region (e.g., fig. 12).

It should be noted that the plurality of second signal leads may also be distributed on the third side or the fourth side of the second peripheral circuit region, and the plurality of second signal leads are not particularly limited in this embodiment of the application.

It should be further noted that the first signal lead and the second signal lead are only for convenience of distinction, and may be substantially the same type or the same type of signal lead, and for the related description of the signal leads, please refer to the description of the embodiment in fig. 1 for details, and no further description is provided herein for avoiding repetition.

Therefore, the number of signal leads corresponding to each layer of electrodes is reduced by arranging one type of electrodes in different layers, and the edge width of the whole touch panel is reduced. Meanwhile, one type of electrodes in the touch electrodes are arranged on different layers, so that the distances from the touch capacitive unit to the fingers are different, and the purpose of improving the identification degree of signals due to different sensing signals from the fingers to the different layers is achieved.

In an embodiment of the present invention, the plurality of second signal leads are distributed on a first side and a fourth side of the second peripheral circuit region, which are adjacent to the second type of touch sensing region, wherein the first side and the fourth side are both provided with a wire collecting portion, and the other ends of the plurality of second signal leads are collected at the wire collecting portion.

Specifically, referring to fig. 7, the second-type electrode layer 3 (or 4) includes a first side, a second side, a third side, and a fourth side which are adjacent in this order, wherein the first side and the third side are opposite, and the second side and the fourth side are opposite. And a plurality of second-type electrodes 31 (or 41) extending from the second side to the fourth side (i.e. the second direction B) are included in the second-type touch sensing area.

The two stacked second electrode layers each include a second peripheral line region (i.e., a portion between a frame of the second electrode layer 3 (or 4) and the dotted line frame in fig. c or d) and a second touch sensing region. The second peripheral wiring section includes a plurality of second signal leads 32 (or 42). The second signal leads 32 (or 42) are collected at the first side and the fourth side of the second peripheral circuit area near one end of the second type touch sensing area. The first side (or the third side) and the fourth side of the second peripheral line region are provided with line concentration parts. The wire trap portion may be a collection of the plurality of second signal leads at the first side (or the third side) and the fourth side. One end of each second signal lead is electrically connected with the corresponding second electrode, and the other end of each second signal lead is gathered at the corresponding wire collecting part and connected with the touch chip.

For example, the second type electrodes 31 (or 41) are divided into two groups based on the symmetry axis parallel to the B direction in the second type touch sensing area, one group of the second type electrodes 31 collects the second signal leads 32 connected thereto on the first side, and the other group of the second type electrodes 31 collects the second signal leads 32 connected thereto on the fourth side, for example, the leads in (c) are arranged.

Or one group of the plurality of second-type electrodes 41 may collect the plurality of second signal leads 42 connected thereto on the fourth side, and another group of the plurality of second-type electrodes 41 may collect the plurality of second signal leads 42 connected thereto on the third side, for example, the lead arrangement in (d), and the specific form of the lead arrangement is not limited in the embodiment of the present application.

In the above embodiment, the plurality of second-type electrodes are grouped based on the symmetry axis, but the actual division manner may be as follows: 2 or 1: 3, etc., and the embodiments of the present application are not particularly limited thereto. The second type of electrodes may also be divided into three groups, four groups, etc., which is not specifically limited in the embodiments of the present application.

It should be appreciated that this solution requires four-sided wire-outgoing for the entire touch panel. The first type of electrodes has four sets of line concentration portions in total and are distributed on three sides, for example, see "second side, fourth side + first side or third side" in fig. 7(a) and (b). The same applies to the second type of electrodes, which comprise four sets of wire concentration portions and are distributed on three sides, see for example "first side, third side + second side or fourth side" in fig. 7(c) and (d).

Therefore, the first-type electrodes are arranged into at least two layers, so that the number of signal leads corresponding to each layer is reduced. Meanwhile, the whole touch panel adopts a three-edge outgoing line mode, and compared with a two-edge outgoing line mode, the edge width of the whole touch panel is further reduced.

In an embodiment of the present invention, the plurality of second signal leads are distributed on a fourth side of the second peripheral circuit region adjacent to the second type of touch sensing region, the fourth side is provided with a line concentration portion, and the other ends of the plurality of second signal leads are collected in at least one line concentration portion.

Specifically, referring to fig. 12, the second-type electrode layer 3 (or 4) includes a first side, a second side, a third side, and a fourth side that are adjacent in this order, wherein the first side and the third side are opposite, and the second side and the fourth side are opposite. And a plurality of second type electrodes 31 (or 41) extending from the second side to the fourth side (i.e. the second direction B) are included in the second type touch sensing area.

The two stacked second electrode layers each include a second peripheral line region (i.e., a portion between a frame of the second electrode layer 3 (or 4) and the dotted line frame in fig. c or d) and a second touch sensing region. The second peripheral wiring section includes a plurality of second signal leads 32 (or 42). The second signal leads 32 (or 42) are collected at the second side or the fourth side of the second peripheral circuit area. The second side or the fourth side of the second peripheral line area is provided with a line concentration part. The wire trap portion may be a collection of a plurality of signal leads at the second side (or fourth side). One end of each second signal lead is electrically connected with the corresponding second electrode, and the other end of each second signal lead is gathered at the corresponding wire collecting part and connected with the touch chip. The specific distribution positions of the plurality of second signal leads 32 (or 42) are not particularly limited in the embodiment of the present application, and can be flexibly set according to actual situations.

In one example, the signal leads of the two stacked second electrode layers are led out in a single-side concentrated manner. Namely, the signal leads in the two electrode layers are all led out from the second side or the fourth side.

It should be understood that only two outgoing lines are needed for the entire touch panel. That is, the first type electrode has only 2 groups of collecting parts, for example, the collecting areas of the first signal leads on the first side in the figures (a) and (b), and are distributed on the same side. The first type of electrode may be wired on only the first side or the third side. The same applies to the second type of electrodes, which have 2 sets of line concentration portions, such as the collection regions of the second signal leads on the fourth side in fig. c and (d), and are distributed on the same side. The second type of electrode may be wired only on the second side or on the fourth side.

Therefore, the first-type electrodes are arranged into at least two layers, so that the number of signal leads corresponding to each layer is reduced. Meanwhile, the whole touch panel adopts a mode of outgoing wires from two sides, and compared with the non-layered electrode layer in the prior art, the edge width of the whole touch panel is further reduced.

In an embodiment of the present application, the plurality of second-type electrodes are patterned metal mesh electrodes, and the plurality of second-type electrodes included in each of the at least two second-type electrode layers adopt a non-identical polygonal metal mesh pattern.

Specifically, the metal grid structure of the second type of electrode is substantially the same as the metal grid structure of the first type of electrode, and for details, refer to the description of the above embodiments, and are not repeated herein.

Therefore, in the embodiment of the application, the at least two second electrode layers are arranged to be the metal grid electrodes with different patterns, so that interference fringes are avoided, and the distinguishable characteristics of signals are increased.

Fig. 13 is a schematic structural diagram of a main viewing angle of a touch display device according to an embodiment of the present application. As shown in fig. 13, the touch display device includes two first electrode layers, one first electrode layer 1 and the other first electrode layer 2. And, the touch control display device also comprises two second electrode layers, wherein one second electrode layer 3 and the other second electrode layer 4. In addition, the touch display device further comprises two layers of substrates, wherein the first substrate 5 and the second substrate 6 are arranged on the two layers of substrates, and the touch display device further comprises an optical adhesive layer 7 and a display screen 8.

Specifically, the main viewing direction is a direction parallel to the touch display device.

The touch display device comprises a first electrode layer 1, a first substrate 5, another first electrode layer 2, an optical adhesive layer 7, a second electrode layer 3, a second substrate 6, another second electrode layer 4 and a display screen 8 which are sequentially stacked. The arrangement sequence of the two first electrode layers and the two second electrode layers may be set according to actual requirements, which is not specifically limited in this embodiment of the application.

The display screen 8 may be any one of an lcd (liquid Crystal display) display, an lcm (liquid Composite molding) display module, and an OLED (Organic Light-Emitting Diode) display screen, which is not specifically limited in this embodiment of the present application. The LCD display has thin body, saves space, saves electricity, does not generate high temperature and radiation, is beneficial to body health and does not hurt eyes; the LCM has the advantages of size, no radiation and flicker in the working process, low energy consumption and good visual effect; the OLED display screen is a self-luminous display screen, does not need a backlight source, can realize the ultrathin screen, has good anti-seismic performance, large visual angle, short response time and high refreshing speed, can be bent and the like, and is suitable for various working conditions and display shapes.

It should be noted that the embodiments of the present application include the touch panel of any of the above embodiments.

Therefore, in the embodiment of the application, the four electrode layers are arranged, so that in the actual operation process, the sensing signals of the four electrode layers touched by the fingers are different, and the identification degree of the signals is improved. Meanwhile, one type of electrodes are arranged on different layers, so that the number of signal leads corresponding to each layer of electrodes is reduced, and the edge width of the whole touch panel is further reduced.

Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby the features defining "first", "second" may explicitly or implicitly include at least one such feature.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. A touch panel is characterized in that the touch panel is provided with a touch area and comprises at least two first electrode layers which are arranged in a laminating way,

the first electrode layers comprise first touch sensing areas, the first touch sensing areas respectively comprise at least two first electrode layers and are spliced and filled in the touch areas, and the first touch sensing areas comprise a plurality of first electrodes extending along a first direction;

the first-type electrode layer further comprises a first peripheral line area adjacent to the touch area, wherein the first peripheral line area comprises a plurality of first signal leads, one ends of the first signal leads are electrically connected with the first-type electrodes, and the first signal leads are distributed on at least one side of the first peripheral line area.

2. The touch panel of claim 1, wherein the first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type of touch sensing area, and a wire collecting portion is disposed on the first side, and the other ends of the first signal leads are collected at the at least one wire collecting portion.

3. The touch panel of claim 1, wherein the first signal leads are distributed on a first side and a second side of the first peripheral circuit area adjacent to the first type of touch sensing area, wherein each of the first side and the second side is provided with a wire collecting portion, and the other ends of the first signal leads are collected at the wire collecting portion.

4. The touch panel according to any one of claims 1 to 3, wherein the first electrodes are patterned metal mesh electrodes, and the first electrodes included in each of the at least two first electrode layers are not identical polygonal metal mesh patterns.

5. The touch panel according to any one of claims 1 to 3, further comprising at least two second electrode layers stacked on top of each other,

the second electrode layers comprise second-type touch sensing areas, the second-type touch sensing areas respectively comprise at least two second-type electrode layers which are spliced and filled in the touch areas, and the second-type touch sensing areas comprise a plurality of second-type electrodes extending along a second direction;

the second electrode layer further includes a second peripheral line region adjacent to the touch region, wherein the second peripheral line region includes a plurality of second signal leads having one end electrically connected to the second electrodes, and the second signal leads are disposed on at least one side of the second peripheral line region.

6. The touch panel of claim 5, wherein the second signal leads are distributed on a fourth side of the second peripheral circuit area adjacent to the second touch sensing area, and the fourth side has a line concentration portion, and the other ends of the second signal leads are collected at the at least one line concentration portion; alternatively, the first and second electrodes may be,

the plurality of second signal leads are distributed on a first side and a fourth side of the second peripheral line area, which are adjacent to the second type touch sensing area, wherein the first side and the fourth side are provided with a line concentration part, and the other ends of the plurality of second signal leads are collected at the line concentration part.

7. The touch panel according to claim 5, wherein the second electrodes are patterned metal mesh electrodes, and the second electrodes included in each of the at least two second electrode layers are not identical polygonal metal mesh patterns.

8. The touch panel according to claim 5, wherein the number of layers of the first type electrode layer is two, and the number of layers of the second type electrode layer is two.

9. The touch panel according to claim 5, wherein the first electrode layer is a driving electrode layer, and the second electrode layer is a sensing electrode layer; alternatively, the first and second electrodes may be,

the first electrode layer is the sensing electrode layer, and the second electrode layer is the driving electrode layer.

10. A touch display device, comprising:

a display screen; and

the touch panel according to any one of claims 1 to 9.

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