Touch panel and touch display device

Abstract

The present application provides a touch panel and a touch display device, the touch panel having a touch area, the touch panel including at least two first-type electrode layers stacked, the first-type electrode layer including a first-type touch sensing area, the first-type touch sensing area respectively included in the at least two first-type electrode layers is spliced ​​to fill the touch area, wherein the first-type touch sensing area includes a plurality of first-type electrodes extending along a first direction; the first-type electrode layer also includes a first peripheral circuit area adjacent to the touch area, wherein the first peripheral circuit area includes a plurality of first signal leads having one end electrically connected to the plurality of first-type electrodes, and the plurality of first signal leads are distributed on at least one side of the first peripheral circuit area. The embodiment of the present application reduces the number of signal leads corresponding to each layer of electrodes by arranging the electrodes of the first type in different layers, thereby reducing the side width of the entire touch panel.

Description

Technical Field

[0001] The present application relates to the field of touch technology, and in particular to a touch panel and a touch display device. Background Art

[0002] Generally, a plurality of signal leads need to be arranged at the edge of the touch panel to ensure that the electrodes in the touch circuit are electrically connected to other electronic components. However, the arranged signal leads will cause the peripheral wiring area of ​​the touch panel to occupy a larger edge width. Summary of the invention

[0003] In view of this, embodiments of the present application provide a touch panel and a touch display device, which can reduce the width of the peripheral circuit area.

[0004] 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 together, the first-type electrode layers including a first-type touch sensing area, and the first-type touch sensing areas respectively included in the at least two first-type electrode layers are spliced ​​to fill the touch area, wherein the first-type touch sensing area includes a plurality of first-type electrodes extending along a first direction; the first-type electrode layers also include a first peripheral circuit area adjacent to the touch area, wherein the first peripheral circuit area includes a plurality of first signal leads having one end electrically connected to the plurality of first-type electrodes, and the plurality of first signal leads are distributed on at least one side of the first peripheral circuit area.

[0005] In one embodiment of the present application, a plurality of first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type touch sensing area, and a line collection portion is provided on the first side, and the other ends of the plurality of first signal leads are collected at at least one line collection portion.

[0006] In one embodiment of the present application, a plurality of 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, and both the first side and the second side are provided with a line collection portion, and the other ends of the plurality of first signal leads are collected at the line collection portion.

[0007] In one embodiment of the present application, the plurality of first-type electrodes are patterned metal grid electrodes, and the plurality of first-type electrodes included in each of the at least two first-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

[0008] In one embodiment of the present application, it also includes at least two layers of second-type electrode layers stacked together, the second-type electrode layers include a second-type touch sensing area, and the second-type touch sensing areas respectively included in the at least two layers of second-type electrode layers are spliced ​​to fill the touch area, wherein the second-type touch sensing area includes a plurality of second-type electrodes extending along the second direction; the second-type electrode layer also includes a second peripheral circuit area adjacent to the touch area, wherein the second peripheral circuit area includes a plurality of second signal leads having one end electrically connected to the plurality of second-type electrodes, and the plurality of second signal leads are distributed on at least one side of the second peripheral circuit area.

[0009] In one embodiment of the present application, 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, and a line collection portion is provided on the fourth side, and the other ends of the plurality of second signal leads are collected at at least one line collection portion; or, the plurality of second signal leads are distributed on a first side and a fourth side of the second peripheral circuit area adjacent to the second type of touch sensing area, and a line collection portion is provided on both the first side and the fourth side, and the other ends of the plurality of second signal leads are collected at the line collection portion.

[0010] In one embodiment of the present application, the plurality of second-type electrodes are patterned metal grid electrodes, and the plurality of second-type electrodes included in each of the at least two second-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

[0011] In one embodiment of the present application, the number of layers of the first type of electrode layer is two, and the number of layers of the second type of electrode layer is two.

[0012] In an embodiment of the present application, the first type of electrode layer is a driving electrode layer, and the second type of electrode layer is a sensing electrode layer; or, the first type of electrode layer is a sensing electrode layer, and the second type of electrode layer is a driving electrode layer.

[0013] In a second aspect, the present application provides a touch display device, which includes: a display screen; and the touch panel described in the first aspect.

[0014] The embodiment of the present application provides a touch panel and a touch display device, which reduces the number of signal leads corresponding to each layer of electrodes by arranging a type of electrodes in different layers, thereby reducing the width of the peripheral circuit area, and further reducing the edge width of the entire touch panel. At the same time, a type of electrodes in the touch electrodes are arranged in different layers, so that the distance from the touch capacitor unit to the finger at different positions in the touch area is not completely the same, and the spacing between the two electrodes constituting the capacitor unit is not completely the same, so that when the finger touches different positions, the sensing signal is not completely the same, thereby helping to identify the touch position and improving the signal recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1FIG. 1 is a schematic diagram of the structure of a touch panel provided in an embodiment of the present application from a top view perspective.

[0016] Figure 2 FIG. 1 is a schematic diagram of the structure of a touch panel provided in another embodiment of the present application from a top view perspective.

[0017] Figure 3 FIG. 1 is a schematic diagram of the structure of a touch panel provided in another embodiment of the present application from a top view.

[0018] Figure 4 Shown is a schematic structural diagram of a patterned metal grid electrode provided in one embodiment of the present application.

[0019] Figure 5 Shown is a schematic structural diagram of a patterned metal grid electrode provided in another embodiment of the present application.

[0020] Figure 6 Shown is a schematic structural diagram of a patterned metal grid electrode provided in yet another embodiment of the present application.

[0021] Figure 7 FIG. 1 is a schematic diagram of the structure of a touch panel provided in a top view according to another embodiment of the present application.

[0022] Figure 8 FIG. 1 is a schematic diagram of the structure of a touch panel provided in a top view according to another embodiment of the present application.

[0023] Fig. 9 FIG. 1 is a schematic diagram showing the structure of the electrode arrangement of a touch panel provided in an embodiment of the present application from a top view perspective.

[0024] Fig.10 FIG. 1 is a schematic diagram of a three-dimensional structure of a touch panel provided in an embodiment of the present application.

[0025] Fig.11 FIG. 1 is a schematic diagram of a three-dimensional structure of a touch panel provided in another embodiment of the present application.

[0026] Fig.12 FIG. 1 is a schematic diagram of the structure of a touch panel provided in a top view according to another embodiment of the present application.

[0027] Fig.13 FIG. 1 is a structural schematic diagram of a main viewing angle of a touch display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0029] Figure 1 FIG. 1 is a schematic diagram of a touch panel provided in an embodiment of the present application from a top view perspective. Figure 1 As shown, the touch panel provided in the embodiment of the present application has a touch area, and the touch panel includes: two first-type electrode layers stacked, for example Figure 1 A first-type electrode layer 1 (i.e., the first-type electrode layer 1 in (a)) and another first-type electrode layer 2 (i.e., the first-type electrode layer 2 in (b)). The first-type electrode layer 1 and the first-type electrode layer 2 each include a first-type touch sensing area. The first-type touch sensing areas included in each of the two first-type electrode layers are spliced ​​to fill the touch area of ​​the touch panel. The first-type touch sensing area includes a plurality of first-type electrodes 11 (or 21) extending along a first direction A. The first-type electrode layer 1 also includes a first peripheral circuit area adjacent to the touch area (i.e., the portion between the border of the first-type electrode layer 1 and the dotted frame in Figure (a)), wherein the first peripheral circuit area includes a plurality of first signal leads 12 (or 22) having one end electrically connected to the plurality of first-type electrodes 11 (or 21). The plurality of first signal leads 11 (or 22) are distributed on at least one side of the first peripheral circuit area.

[0030] Specifically, Figure 1 The top view direction is perpendicular to the touch panel from top to bottom. It should be noted that the number of stacked first-type electrode layers is not limited to the two layers mentioned in the embodiment of the present application, but can also be three, four or more layers, which is not specifically limited in the embodiment of the present application.

[0031] The first direction A and the second direction B are perpendicular to each other. The first direction A or the second direction B can be the X-axis direction (horizontal) or the Y-axis direction (longitudinal) of the two-dimensional rectangular coordinate system, that is, when the first direction A is the X-axis direction (horizontal), then the second direction B refers to the Y-axis direction (longitudinal), and when the first direction A is the Y-axis direction (longitudinal), then the second direction B refers to the X-axis direction (horizontal).

[0032] Continue to refer to Figure 1As shown, the two stacked first-type electrode layers can be stacked by stacking the first-type electrode layer 1 in (a) and the first-type electrode layer 2 in (b). In the first-type electrode layer 1, the first-type touch sensing area can be formed by combining a plurality of first-type electrodes 11 extending along the first direction A, filling the upper half 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-type electrode layer 2, the first-type touch sensing area can also be formed by combining a plurality of first-type electrodes 21 extending along the first direction A, filling the lower half of the touch area of ​​the entire touch panel, and any two adjacent first-type electrodes 21 are not connected to each other. When the first-type electrode layers 1 and 2 are superimposed, the first-type touch sensing area formed by combining a plurality of first-type electrodes 11 and the first-type touch sensing area formed by combining a plurality of first-type electrodes 21 can be spliced ​​and fill the entire touch area. In other words, the plurality of first-type electrodes 11 and the plurality of first-type electrodes 21 have no overlap and just fill the entire touch area.

[0033] The touch area may be the central area of ​​the touch panel, which is equivalent to the display area of ​​the touch screen. The touch area may also be understood as an area formed by a combination of multiple first-type touch sensing areas.

[0034] The first type of touch sensing area may include a plurality of first type electrodes (eg Figure 1 The first type of electrode 11 or the first type of electrode 21 shown). The first type of touch sensing area may also include a plurality of first type electrodes (eg, Figure 2 The first type of electrode 11 or the first type of electrode 21 shown in the figure). In addition, the sizes of the first type of touch sensing areas respectively included in the two first type of electrode layers can be equal (ie, the touch sensing areas are equally divided, see Figure 1 ), or they may be unequal. In addition, the shape of the first type of touch sensing area may be a rectangle (e.g. Figure 1 ), trapezoidal (e.g. Figure 2 ), triangle or other polygons. The embodiment of the present application does not specifically limit the size, shape and composition of the first type of touch sensing area.

[0035] It should be understood that Figure 1 The number of electrode layers of the first type shown is the same, Figure 2It also includes two first-type electrode layers, namely, the first-type electrode layer 1 in Figure (a) and the first-type electrode layer 2 in Figure (b). The first-type electrode layer 1 in (a) includes a first-type touch sensing area composed of a plurality of first-type electrodes 11 having a certain angle with the first direction A, and a plurality of metal leads 12 electrically connected to the plurality of first-type electrodes 11. The first-type electrode layer 2 in (b) also includes a first-type touch sensing area composed of a plurality of first-type electrodes 21 having a certain angle with the first direction A, and a plurality of metal leads 22 electrically connected to the plurality of first-type electrodes 21. Moreover, the first-type touch sensing area formed by the combination of the plurality of first-type electrodes 11 and the first-type touch sensing area formed by the combination of the plurality of first-type electrodes 21 can be spliced ​​and fill the entire touch area.

[0036] In one example, the first type of electrode layer can be either a driving electrode layer or a sensing electrode layer. For example, the first type of electrode layer is a driving electrode layer and the first type of electrodes are driving electrodes, or the first type of electrode layer is a sensing electrode layer and the first type of electrodes are sensing electrodes.

[0037] The first type of electrode layer also includes a first peripheral circuit area. The first peripheral circuit area is the portion between the frame of the first type of electrode layer 1 and the dotted frame in Figure (a), and the first peripheral circuit area is the portion between the frame of the first type of electrode layer 2 and the dotted frame in Figure (b). The first peripheral circuit area also includes a plurality of first signal leads 12 (or 22), and a 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), and the plurality of first signal leads 12 formed thereby are all gathered in a certain area of ​​at least one side of the first peripheral circuit area (which may be the upper side, lower side, left side or right side of the touch panel) to connect to the touch chip, thereby connecting the first type electrode 11 to the touch chip.

[0038] In one embodiment, see Figure 1 The plurality of first signal leads 12 may be distributed on the first side and the second side of the first peripheral circuit area adjacent to the first type of touch sensing area, and both the first side and the second side are provided with a line collection portion, and the other ends of the plurality of first signal leads are collected at the line collection portion.

[0039] In one embodiment, see Figure 2 , a plurality of first signal leads 12 may be distributed on a first side of the first peripheral circuit area adjacent to the first type of touch sensing area, and a line collection portion is provided on the first side, and the other ends of the plurality of first signal leads are collected at at least one line collection portion.

[0040] 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 area, which is not specifically limited in the present embodiment. For details on the arrangement of the first signal leads, please refer to the description of the following embodiment, which will not be repeated here to avoid repetition.

[0041] It should also be noted that the plurality of first signal leads 12 may be a plurality of metal leads. The width of the plurality of first signal leads may be 4 μm to 15 μm, and the material may be silver, copper or nano-scale conductive powder (powder particles are 10 nm to 100 nm), etc. The preparation process of the plurality of first signal leads 12 may be any one of screen printing, laser etching, 3D printing, etc.

[0042] It should also be noted that the two stacked first-type electrode layers can be adhered by OCA optical adhesive. Alternatively, the two stacked first-type electrode layers use the substrate as a carrier, and the two first-type electrode layers are respectively located on the upper and lower surfaces of the substrate.

[0043] It can be seen that the embodiment of the present application arranges a type of electrodes in different layers, thereby reducing the number of signal leads corresponding to each layer of electrodes, thereby reducing the width of the peripheral circuit area, and further reducing the edge width of the entire touch panel. At the same time, a type of electrodes in the touch electrodes are arranged in different layers, so that the distance from the touch capacitor unit to the finger at different positions in the touch area is not exactly the same, and the spacing between the two electrodes constituting the capacitor unit is not exactly the same, so that when the finger touches different positions, the sensing signal is not exactly the same, thereby helping to identify the touch position and improving the signal recognition.

[0044] In one embodiment of the present application, a plurality of first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type touch sensing area, and a line collection portion is provided on the first side, and the other ends of the plurality of first signal leads are collected at at least one line collection portion.

[0045] Specifically, see Figure 3 The first type of electrode layer 1 (or 2) includes first sides (for example, the first side may be Figure 3 The left side of the orientation shown), the second side (for example, the second side can be Figure 3 The upper side of the orientation shown), the third side (for example, the third side can be Figure 3 The right side of the orientation shown) and the fourth side (for example, the fourth side can be Figure 3 The first type of touch sensing area includes a plurality of first type electrodes 11 (or 21) extending from the first side to the third side (ie, the first direction A).

[0046] The two stacked first-class electrode layers both include a first peripheral circuit area (i.e., the portion between the border and the dotted frame of the first-class electrode layer 1 (or 2) in Figure (a) or (b)) and a first-class touch sensing area. The first peripheral circuit area includes a plurality of first signal leads 12 (or 22). The plurality of first signal leads 12 (or 22) converge at the first side or the third side of the first peripheral circuit area close to one end of the first-class touch sensing area. A line collection portion is provided on the first side (or the third side) of the first peripheral circuit area. The line collection portion may be the gathering place of a plurality of signal leads on the first side, one end of the plurality of first signal leads is electrically connected to a plurality of first-class electrodes respectively, and the other end converges at the line collection portion and is connected to the touch chip. The embodiment of the present application does not specifically limit the specific distribution positions of the plurality of first signal leads, and can be flexibly arranged according to actual conditions.

[0047] There may be one wiring hub located in the middle of the first type of touch sensing area, for example Figure 3 and Fig.12 In (a), the first signal lead 12 converges at the middle of the first side (i.e., the left side) of the first type of touch sensing area. There may be two, three, four, etc., wiring hubs. The embodiment of the present application does not specifically limit the number of wiring hubs. Multiple wiring hubs may be distributed on the same side or on multiple sides of the first peripheral circuit area; each lead may be evenly distributed and gathered to multiple wiring hubs. For example, two wiring hubs may be both provided on the first side, or may be provided on the same side. Figure 1 and Figure 7 The first signal as shown by quotation mark 12 in (a) is respectively arranged on the first side and the second side (ie, the left side and the upper side of the first type of touch sensing area in (a)).

[0048] Exemplarily, the signal leads of the two stacked first-type electrode layers are unilaterally concentrated, that is, the signal leads in the two electrode layers are all led out on the first side or the third side, or on the second side or the fourth side, which is not specifically limited in this application.

[0049] It can be seen that the embodiment of the present application arranges the first type of electrodes into at least two layers, so that the number of signal leads corresponding to each layer is reduced. At the same time, the single-side lead-out method is adopted, which further reduces the side width of the entire touch panel compared with the non-layered electrode layer in the prior art.

[0050] In one embodiment of the present application, a plurality of 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, and both the first side and the second side are provided with a line collection portion, and the other ends of the plurality of first signal leads are collected at the line collection portion. For example, the second side may be Figure 7 Upper side of the orientation shown.

[0051] Specifically, see Figure 1The first type of electrode layer 1 (or 2) includes a first side, a second side, a third side and a fourth side which are adjacent to each other in sequence, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side. The first type of 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).

[0052] The two stacked first-type electrode layers each include a first peripheral circuit area (i.e., the portion between the border and the dotted frame of the first-type electrode layer 1 (or 2) in Figure (a) or (b)) and a first-type touch sensing area. The first peripheral circuit area includes a plurality of first signal leads 12 (or 22). The plurality of first signal leads 12 (or 22) are gathered at the first side and the second side of the first peripheral circuit area near one end of the first-type touch sensing area. A line collection portion is provided on the first side and the second side of the first peripheral circuit area. The line collection portion may be the gathering place of the plurality of first signal leads on the first side and the second side, one end of the plurality of first signal leads is electrically connected to the plurality of first-type electrodes respectively, and the other end is gathered at the line collection portion and connected to the touch chip.

[0053] The arrangement method can be to divide the plurality of first-type electrodes 11 (or 21) into two groups based on the symmetry axis parallel to the A direction 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 collection part 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 collection part on the first side, for example Figure 1 (a) Distribution of leads.

[0054] Alternatively, one group of multiple first-type electrodes 21 collects multiple first signal leads 22 connected thereto at the collection portion on the fourth side, and another group of multiple first-type electrodes 21 collects multiple first signal leads 22 connected thereto at the collection portion on the first side, for example Figure 1 Regarding the lead arrangement in (b), the embodiment of the present application does not limit the specific form of the lead arrangement.

[0055] The hub can have 2 (for example Figure 1 and Figure 7 ), there may be 3, 4, etc. The embodiment of the present application does not specifically limit the number of line collection parts. Multiple line collection parts may be distributed on the same side or on multiple sides of the first peripheral line area. For detailed description, please refer to the description of the above embodiment, and will not be repeated here to avoid repetition.

[0056] It should be noted that the above embodiment uses the axis of symmetry as the basis for grouping multiple first-type electrodes, but the actual division method can be grouped in the form of 1:2 or 1:3, etc., and the embodiment of the present application does not specifically limit this. The first-type electrodes can also be divided into three groups, four groups, etc., and the embodiment of the present application does not specifically limit this.

[0057] It can be seen that the embodiment of the present application arranges the first type of electrodes into at least two layers, so that the number of signal leads corresponding to each layer is reduced. At the same time, the two-side lead-out method is adopted, which further reduces the side width of the entire touch panel compared with the single-side lead-out method.

[0058] In one embodiment of the present application, the plurality of first-type electrodes are patterned metal grid electrodes, and the plurality of first-type electrodes included in each of the at least two first-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

[0059] Specifically, the material of the metal grid electrode can be at least one of Cu, Ag, Al, Ti or Ni, and the grid pattern of the metal grid layer can be a rectangle, a square, a diamond or other polygons. The embodiment of the present application does not specifically limit the metal grid electrode and the grid pattern. In addition, it should be noted that although the metal wires in the metal grid are opaque to light, the metal wires are thin and cannot be felt by the human eye, that is, the metal grid is transparent to the human eye and does not affect the transparency of the entire touch panel.

[0060] In one embodiment, the first-type electrodes included in each of the at least two first-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

[0061] The polygonal metal mesh pattern may be an irregular polygonal metal mesh pattern. The irregular polygon may be a non-regular polygon, that is, the length of at least one side of the polygon is not equal to the lengths of the other sides, for example Figure 4 ; or at least one edge of the polygon can be a curve or a polyline, for example Figure 5 ; or the angles inside the polygons are different, for example, the angles formed by any two adjacent sides of each polygon are randomly configured in an appropriate angle range, and the appropriate angle range can be set to between 75 and 125 degrees; or at least part of the metal wires in the patterned metal grid electrode are non-straight lines, for example Figure 6 (The dotted lines in the figure represent the arrangement of metal wires). The present application does not specifically limit the irregular polygonal pattern.

[0062] The non-identical polygonal metal grid patterns mentioned here may refer to at least one of different polygon angles, different side lengths, and different degrees of curvature of the sides. In other words, it is sufficient to ensure that the patterns between the first-class electrode layers are different. Even if each layer is an irregular polygonal metal grid pattern, the patterns between the layers are different. For example, there are two first-class electrode layers in total, and the side length of the polygonal metal grid pattern of one first-class electrode layer is different from the side length of the polygonal metal grid pattern of another first-class electrode layer. For another example, there are two first-class electrode layers in total, and the side curvature of the polygonal metal grid pattern of one first-class electrode layer is different from the side curvature of the polygonal metal grid pattern of another first-class electrode layer.

[0063] In the embodiment of the present application, thinner metal wires are used to set at least two first-type electrode layers as patterned metal grid electrodes, thereby increasing the light transmittance of the touch panel.

[0064] It can be seen that the embodiment of the present application avoids the generation of interference fringes and increases the signal identifiable features by configuring at least two first-type electrode layers as metal grid electrodes with different patterns.

[0065] Figure 7 FIG. 1 is a schematic diagram of a touch panel provided in another embodiment of the present application from a top view perspective. Figure 1 Based on the embodiment shown, Figure 7 The embodiment shown is described below in detail. Figure 7 The embodiments shown and Figure 1 Differences of the illustrated embodiments.

[0066] like Figure 7 As shown, the touch panel has a touch area, and the touch panel includes: two layers of first-type electrode layers and two layers of second-type electrode layers stacked. Among them, the number of layers of the first-type electrode layer is two, that is, one layer of first-type electrode layer 1 and another layer of first-type electrode layer 2; the number of layers of the second-type electrode layer is two, that is, one layer of second-type electrode layer 3 and another layer of second-type electrode layer 4. The second-type electrode layer 3 (or 4) each includes a second-type touch sensing area. The second-type touch sensing areas included in the two layers of the second-type electrode layers are spliced ​​to fill the entire touch area. The first-type touch sensing areas included in the two layers of the first-type electrode layers are also spliced ​​to fill the entire touch area. 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 also includes a second peripheral circuit area adjacent to the touch area (i.e., the portion between the frame of the second type electrode layer 3 and the dotted frame in Figure (c)), wherein the second peripheral circuit area 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 distributed on at least one side of the second peripheral circuit area.

[0067] Specifically, Figure 7 The top-view direction shown is the direction perpendicular to the touch panel from top to bottom. It should be noted that the number of layers of the stacked first type electrode layer and the second type electrode layer is not limited to the two layers mentioned in the embodiment of the present application, and can also be three layers, four layers or more layers, which is not specifically limited in the embodiment of the present application.

[0068] like Figure 7 As shown in (c), in the second type electrode layer 3, the second type touch sensing area refers to a touch area formed by a combination of a plurality of second type electrodes 31 extending along the second direction B, filling the left half of the touch area of ​​the entire touch panel, and any two adjacent second type electrodes 31 are not connected to each other. Figure 7 As shown in (d), in the second type electrode layer 4, the second type touch sensing area refers to the touch area formed by the combination of multiple second type electrodes 41 extending along the second direction B, filling the 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. When the second type electrode layers 3 and 4 are superimposed, the second type touch sensing area formed by the combination of multiple second type electrodes 31 and the second type touch sensing area formed by the combination of multiple second type electrodes 41 can be spliced ​​and completely fill the touch area of ​​the touch panel.

[0069] The touch area may be the central area of ​​the touch panel, which is equivalent to the display area of ​​the touch screen. The touch area may be understood as an area formed by a combination of multiple second-type touch sensing areas.

[0070] The second type of 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 (eg Figure 8 The sizes of the second type touch sensing areas included in the two second type electrode layers can be equal (i.e., the touch sensing areas are equally divided) or unequal. The shape of the second type touch sensing area can be rectangular (e.g., Figure 7 ), trapezoidal (e.g. Figure 8 ), triangle or other polygons. The embodiment of the present application does not specifically limit the size, shape and composition of the second type of touch sensing area.

[0071] It should be understood that Figure 8 The number of electrode layers included in the touch panel shown is Figure 7 The touch panels shown in the figure have the same number of electrode layers, which are two first-type electrode layers and two second-type electrode layers stacked in layers. Figure 8In the figure, there are two first-type electrode layers, one of which is the first-type electrode 1 in (a) and the first-type electrode 2 in (b). There are two second-type electrode layers, one of which is the second-type electrode 3 in (c) and the second-type electrode 4 in (d). Among them, the first-type electrode layer 1 in (a) includes a first-type touch sensing area composed of a plurality of first-type electrodes 11 with a certain angle to the first direction A, and a plurality of metal leads 12 electrically connected to the plurality of first-type electrodes 11. The first-type electrode layer 2 in (b) also includes a first-type touch sensing area composed of a plurality of first-type electrodes 21 with a certain angle to the first direction A, and a plurality of metal leads 22 electrically connected to the plurality of first-type electrodes 21. The second-type electrode layer 3 in (c) includes a second-type touch sensing area composed of a plurality of second-type electrodes 31 with a certain angle to the second direction B, and a plurality of metal leads 32 electrically connected to the plurality of second-type electrodes 31. The second type electrode layer 4 in (d) also includes a second type touch sensing area composed of a plurality of second type electrodes 41 having a certain angle with the second direction B, and a plurality of metal leads 42 electrically connected to the plurality of second type electrodes 41. The touch sensing area is based on the splicing of the first type electrode layer 1 (or 2) and the second type electrode layer 3 (or 4) and is completely filled with the area.

[0072] Combine the following Figures 9 to 11 An example of stacking of the first type electrode layer and the second type electrode layer included in the touch panel is given.

[0073] See also Fig. 9 , the touch area is completely filled with the first type electrode layer and the second type electrode layer, or in other words, the first type electrodes 11 and 21 extending along the first direction have no overlap and just fill the entire touch area, and the second type electrodes 31 and 41 extending along the second direction have no overlap and just fill the entire touch area. That is, any area of ​​the touch area corresponds to a first type electrode layer and a second type electrode layer for signal sensing. Since there is a height difference between the electrode layers, the signals sensed by the electrode layers are different, thereby improving the signal recognition.

[0074] In one embodiment, the number of the first type of electrode layer is two, and the number of the second type of electrode layer is one, or the number of the first type of electrode layer is one, and the number of the second type of electrode layer is two.

[0075] In one embodiment, the number of the first type of electrode layer is two, and the number of the second type of electrode layer is two.

[0076] It should be noted that the stacking order between the first type of electrode layer and the second type of electrode layer can be varied. Figure 7 The four electrode layers numbered 1 to 4 shown in the figure may be stacked in the order of 1, 2, 3 and 4 in the vertical direction of the touch panel. Fig.10Among them, one first type electrode layer 1 is adhered to another first type electrode layer 2 through a first optical adhesive layer 71, the first type electrode layer 2 is adhered to a second type electrode layer 3 through a second optical adhesive layer 72, and the second type electrode layer 3 is adhered to another second type electrode layer 4 through a third optical adhesive layer 73.

[0077] For example, Figure 7 The four electrode layers numbered 1 to 4 shown in the figure may also be stacked in the order of 1, 3, 4 and 2 in the vertical direction of the touch panel, for example Fig.11 , wherein a first type electrode layer 1 is adhered to a second type electrode layer 3 through a first optical adhesive layer 74, the second type electrode layer 3 is adhered to another second type electrode layer 4 through a second optical adhesive layer 75, and the second type electrode layer 4 is adhered to another first type electrode layer 2 through a third optical adhesive layer 76.

[0078] In addition, it should be noted that Figure 7 The four electrode layers shown are numbered 1 to 4, and the stacking order in the vertical direction of the touch panel can also be 1, 3, 2 and 4, or 3, 2, 1 and 4, etc. The embodiment of the present application does not specifically limit the arrangement order of the electrode layers in the vertical direction.

[0079] In one example, the present invention forms a touch panel by pasting two double-layer metal grid electrodes through an optical adhesive layer. It should be noted that the structure is not limited to double-layer metal grid electrodes, and two double-layer metal grid electrodes are just one way to combine four electrode layers.

[0080] For example, see Figure 7 , the first type electrode layer 1 in (a) and the second type electrode layer 3 in (c) may form a double-layer metal mesh electrode, the first type electrode layer 2 in (b) and the second type electrode layer 4 in (d) may form another double-layer metal mesh electrode, and they may be glued together by an optical adhesive layer. Alternatively, the first type electrode layer 1 in (a) and the first type electrode layer 2 in (b) may form a double-layer metal mesh electrode, the second type electrode layer 3 in (c) and the second type electrode layer 4 in (d) may form another double-layer metal mesh electrode, and they may be glued together by an optical adhesive layer. Alternatively, the first type electrode layer 1 in (a) and the second type electrode layer 4 in (d) may form a double-layer metal mesh electrode, the second type electrode layer 3 in (c) and the first type electrode layer 2 in (b) may form another double-layer metal mesh electrode, and they may be glued together by an optical adhesive layer.

[0081] In one example, the two double-layer metal grid electrodes also include a substrate. The first substrate is equivalent to the carrier of the two first-type electrode layers. The second substrate is equivalent to the carrier of the two second-type electrode layers. The first substrate and the second substrate can be prepared by a process such as a yellow light process, or by a method such as sputtering.

[0082] In one example, one electrode layer can also be disposed on the surface of the cover plate away from the touch panel (e.g., the lower surface). The other two electrode layers are disposed on the upper and lower surfaces of the first substrate, respectively. The last electrode layer is disposed on the upper surface of the second substrate, and then the cover plate, the first substrate, and the second substrate are bonded together by OCA adhesive.

[0083] In one example, both double-layer metal grid electrodes further include an optical adhesive layer. Exemplarily, the number of optical adhesive layers is three. The first optical adhesive layer is used to adhere the two electrode layers in one double-layer metal grid electrode. The second optical adhesive layer is used to adhere the two electrode layers in another double-layer metal grid electrode. The third optical adhesive layer is used to adhere the above two double-layer metal grid electrodes.

[0084] In one embodiment, the first type of electrode layer is a driving electrode layer, and the second type of electrode layer is a sensing electrode layer; or, the first type of electrode layer is a sensing electrode layer, and the second type of electrode layer is a driving electrode layer.

[0085] It should be noted that, in addition to the aforementioned metal grid electrodes, the multiple first-type electrodes and multiple second-type electrodes described in the present application can also be indium tin oxide electrodes, i.e., ITO electrodes. In view of the fact that metal grid electrodes and ITO electrodes each have advantages and disadvantages in practical applications, i.e., ITO electrodes have good transparency but high impedance, while metal grid electrodes have low impedance but low light transmittance, multiple first-type electrodes and multiple second-type electrodes can be composed of different materials, such as the first-type electrodes using metal grid electrodes and the second-type electrodes using ITO electrodes. However, it should be noted that the embodiments of the present application do not limit the specific materials of the multiple first-type electrodes and the multiple second-type electrodes, as long as the above-mentioned disadvantages can be avoided.

[0086] Continue to refer to Figure 7As shown, the touch panel also includes a second peripheral circuit area. The second peripheral circuit area is the portion between the frame of the second type electrode layer 31 (or 41) and the dotted frame in Figure (c) (or Figure (d)). The second peripheral circuit area also includes a plurality of second signal leads 32 (or 42), and the plurality of second type electrodes 31 are electrically connected to the plurality of second signal leads 32, respectively. One second type electrode 31 is electrically connected to one second signal lead 32 (or one second type electrode 41 is electrically connected to one second signal lead 42), and the plurality of second signal leads 42 formed thereby are all gathered in a certain area of ​​at least one side of the second peripheral circuit area (which may be the upper side, lower side, left side or right side of the touch panel) to connect to the touch chip, thereby connecting the second type electrode 31 (or 41) to the touch chip.

[0087] In one embodiment, see Figure 7 The plurality of second signal leads 32 may be distributed on the first side (or the third side) and the fourth side (eg, Figure 7 Alternatively, the plurality of second signal leads 32 may be distributed on a fourth side (eg, Fig.12 ).

[0088] 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 area, and the embodiment of the present application does not specifically limit the plurality of second signal leads.

[0089] It should also be noted that the first signal lead and the second signal lead are only for the convenience of distinction, and can actually be the same type or category of signal leads. For details on the description of the signal leads, please refer to Figure 1 The description of the embodiments will not be repeated here to avoid repetition.

[0090] It can be seen that in the embodiment of the present application, by arranging a type of electrodes in different layers, the number of signal leads corresponding to each layer of electrodes is reduced, thereby reducing the edge width of the entire touch panel. At the same time, by arranging a type of electrodes in the touch electrodes in different layers, the distance from the touch capacitor unit to the finger is also different, so that the sensing signals from the finger to different layers are different, thereby improving the purpose of signal recognition.

[0091] In one embodiment of the present application, the plurality of second signal leads are distributed on the first side and the fourth side of the second peripheral circuit area adjacent to the second type of touch sensing area, and both the first side and the fourth side are provided with a line collection portion, and the other ends of the plurality of second signal leads are collected at the line collection portion.

[0092] Specifically, see Figure 7The second type of electrode layer 3 (or 4) includes a first side, a second side, a third side and a fourth side which are adjacent to each other in sequence, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side. The second type of touch sensing area includes a plurality of second type electrodes 31 (or 41) extending from the second side to the fourth side (i.e., the second direction B).

[0093] The two stacked second-type electrode layers both include a second peripheral circuit area (i.e., the portion between the border of the second-type electrode layer 3 (or 4) and the dotted frame in Figure (c) or (d)) and a second-type touch sensing area. The second peripheral circuit area includes a plurality of second signal leads 32 (or 42). The plurality of second signal leads 32 (or 42) are gathered at the first side and the fourth side of the second peripheral circuit area near one end of the second-type touch sensing area. A line collection portion is provided on the first side (or the third side) and the fourth side of the second peripheral circuit area. The line collection portion may be the gathering place of the plurality of second signal leads on the first side (or the third side) and the fourth side. One end of the plurality of second signal leads is electrically connected to the plurality of second-type electrodes respectively, and the other end is gathered at the line collection portion and connected to the touch chip.

[0094] For example, multiple 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 multiple second-type electrodes 31 gathers the multiple second signal leads 32 connected thereto on the first side, and the other group of multiple second-type electrodes 31 gathers the multiple second signal leads 32 connected thereto on the fourth side, such as the lead arrangement in (c).

[0095] Alternatively, one group of multiple second-type electrodes 41 gathers the multiple second signal leads 42 connected thereto on the fourth side, and another group of multiple second-type electrodes 41 gathers the multiple second signal leads 42 connected thereto on the third side, such as the lead arrangement in (d). The embodiment of the present application does not limit the specific form of the lead arrangement.

[0096] It should be noted that the above embodiment uses the axis of symmetry as the basis for grouping multiple second-type electrodes, but the actual division method can be grouped in the form of 1:2 or 1:3, etc., and the embodiment of the present application does not specifically limit this. The second-type electrodes can also be divided into three groups, four groups, etc., and the embodiment of the present application does not specifically limit this.

[0097] It should be understood that for the entire touch panel, this solution requires wires to be routed from four sides. The first type of electrode has four groups of wire collection parts, which are distributed on three sides. Figure 7 (a) and (b) "the second side, the fourth side + the first side or the third side. The second type of electrode is also the same, including four sets of line collection parts and distributed on three sides, for example, see Figure 7 "The first side, the third side + the second side or the fourth side" in (c) and (d).

[0098] It can be seen that the embodiment of the present application arranges the first type of electrodes into at least two layers, so that the number of signal leads corresponding to each layer is reduced. At the same time, the entire touch panel adopts a three-side lead-out method, which further reduces the side width of the entire touch panel compared to the two-side lead-out method.

[0099] In one embodiment of the present application, the plurality of second signal leads are distributed on a fourth side of the second peripheral circuit area adjacent to the second type touch sensing area, and a line collection portion is provided on the fourth side, and the other ends of the plurality of second signal leads are collected at at least one line collection portion.

[0100] Specifically, see Fig.12 The second type of electrode layer 3 (or 4) includes a first side, a second side, a third side and a fourth side which are adjacent to each other in sequence, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side. The second type of touch sensing area includes a plurality of second type electrodes 31 (or 41) extending from the second side to the fourth side (i.e., the second direction B).

[0101] The two stacked second-type electrode layers both include a second peripheral circuit area (i.e., the portion between the border of the second-type electrode layer 3 (or 4) and the dotted frame in Figure (c) or (d)) and a second-type touch sensing area. The second peripheral circuit area includes a plurality of second signal leads 32 (or 42). The plurality of second signal leads 32 (or 42) converge on the second side or the fourth side of the second peripheral circuit area. A line collection portion is provided on the second side or the fourth side of the second peripheral circuit area. The line collection portion may be the gathering place of the plurality of signal leads on the second side (or the fourth side). One end of the plurality of second signal leads is electrically connected to the plurality of second-type electrodes, respectively, and the other end converges at the line collection portion and is connected to the touch chip. The embodiment of the present application does not specifically limit the specific distribution positions of the plurality of second signal leads 32 (or 42), and can be flexibly arranged according to actual conditions.

[0102] In one example, the signal leads of the two stacked second-type electrode layers are led out in a single-side concentrated manner, that is, the signal leads in the two electrode layers are all led out from the second side or the fourth side.

[0103] It should be understood that for the entire touch panel, only two sides are needed to lead out. That is, the first type of electrode has only two sets of wire collection parts, such as the collection area of ​​multiple first signal leads on the first side in Figures (a) and (b), and they are distributed on the same side. The first type of electrode can only have wires on the first side or the third side. The second type of electrode is also the same, with two sets of wire collection parts, such as the collection area of ​​multiple second signal leads on the fourth side in Figures (c) and (d), and they are distributed on the same side. The second type of electrode can only have wires on the second side or the fourth side.

[0104] It can be seen that the embodiment of the present application arranges the first type of electrodes into at least two layers, so that the number of signal leads corresponding to each layer is reduced. At the same time, the entire touch panel adopts the method of extending the wires on both sides, which further reduces the side width of the entire touch panel compared with the non-layered electrode layer in the prior art.

[0105] In one embodiment of the present application, the plurality of second-type electrodes are patterned metal grid electrodes, and the plurality of second-type electrodes included in each of the at least two second-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

[0106] 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. For details, please refer to the description of the above embodiment, which will not be repeated here.

[0107] It can be seen that the embodiment of the present application avoids the generation of interference fringes and increases the signal identifiable characteristics by configuring at least two second-type electrode layers as metal grid electrodes with different patterns.

[0108] Fig.13 The figure is a schematic diagram of the main viewing angle of the touch display device provided by an embodiment of the present application. Fig.13 As shown, the touch display device includes two first-type electrode layers, including one first-type electrode layer 1 and another first-type electrode layer 2. In addition, the touch display device also includes two second-type electrode layers, including one second-type electrode layer 3 and another second-type electrode layer 4. In addition, the touch display device also includes two substrates, including a first substrate 5 and a second substrate 6, and the touch display device also includes an optical adhesive layer 7 and a display screen 8.

[0109] Specifically, the main viewing direction is a direction parallel to the touch display device.

[0110] The touch display device comprises a first type electrode layer 1, a first substrate 5, another first type electrode layer 2, an optical adhesive layer 7, a second type electrode layer 3, a second substrate 6, another second type electrode layer 4 and a display screen 8 which are stacked in sequence. The arrangement order of the two first type electrode layers and the two second type electrode layers can be arranged according to actual needs, and the embodiment of the present application does not specifically limit this.

[0111] The display screen 8 can 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, and the embodiments of the present application do not specifically limit this. The LCD display has a thin body, saves space, saves electricity, does not generate high temperature, has no radiation, is beneficial to health, and does not hurt the eyes; the LCM display module has a size advantage, and has no radiation or flicker during operation, has relatively low energy consumption, and has a good visual effect; the OLED display screen is a self-luminous display screen that does not require a backlight source, which can achieve an ultra-thin screen, and OLED has good shock resistance, a large viewing angle, a short response time, a fast refresh speed, and is bendable, etc., and is suitable for a variety of working conditions and display shapes.

[0112] It should be noted that the embodiments of the present application include the touch panel of any of the above embodiments.

[0113] It can be seen that the embodiment of the present application sets four electrode layers, so that in actual operation, the sensing signals when the finger touches the four electrode layers are different, thereby improving the signal recognition. At the same time, by arranging a type of electrode in different layers, the number of signal leads corresponding to each electrode layer is reduced, thereby reducing the edge width of the entire touch panel.

[0114] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features.

[0115] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A touch panel, characterized in that: The touch panel has a touch area, and the touch panel includes at least two first-type electrode layers stacked and non-overlapping, The first type of electrode layer includes a first type of touch sensing area, and the first type of touch sensing areas respectively included in the at least two first type of electrode layers are spliced ​​to fill the touch sensing area, wherein the first type of touch sensing area includes a plurality of first type electrodes extending along a first direction; The first type of electrode layer also includes a first peripheral circuit area adjacent to the touch area, wherein the first peripheral circuit area includes a plurality of first signal leads having one end electrically connected to the plurality of first type electrodes, and the plurality of first signal leads are distributed on at least one side of the first peripheral circuit area.

2. The touch panel according to claim 1, characterized in that: The plurality of first signal leads are distributed on a first side of the first peripheral circuit area adjacent to the first type touch sensing area, and a line collection portion is provided on the first side, and the other ends of the plurality of first signal leads are collected at the at least one line collection portion.

3. The touch panel according to claim 1, characterized in that: The plurality of first signal leads are distributed on a first side and a second side of the first peripheral circuit area adjacent to the first type touch sensing area, and both the first side and the second side are provided with a line collection portion, and the other ends of the plurality of first signal leads are collected at the line collection portion.

4. The touch panel according to any one of claims 1 to 3, characterized in that: The plurality of first-type electrodes are patterned metal grid electrodes, and the plurality of first-type electrodes included in each of the at least two first-type electrode layers adopt polygonal metal grid patterns that are not completely the same.

5. The touch panel according to any one of claims 1 to 3, characterized in that: It also includes at least two second-type electrode layers stacked in layers, The second type of electrode layer includes a second type of touch sensing area, and the second type of touch sensing areas respectively included in the at least two layers of the second type of electrode layers are spliced ​​to fill the touch sensing area, wherein the second type of touch sensing area includes a plurality of second type electrodes extending along the second direction; The second type electrode layer also includes a second peripheral circuit area adjacent to the touch area, wherein the second peripheral circuit area includes a plurality of second signal leads having one end electrically connected to the plurality of second type electrodes, and the plurality of second signal leads are distributed on at least one side of the second peripheral circuit area.

6. The touch panel according to claim 5, characterized in that: The plurality of second signal leads are distributed on a fourth side of the second peripheral circuit area adjacent to the second type touch sensing area, and a line collecting portion is provided on the fourth side, and the other ends of the plurality of second signal leads are collected at the at least one line collecting portion; or, The plurality of second signal leads are distributed on a first side and a fourth side of the second peripheral circuit area adjacent to the second type touch sensing area, and both the first side and the fourth side are provided with a line collection portion, and the other ends of the plurality of second signal leads are collected at the line collection portion.

7. The touch panel according to claim 5, characterized in that: The plurality of second-type electrodes are patterned metal grid electrodes, and the plurality of second-type electrodes included in each of the at least two second-type electrode layers adopts a polygonal metal grid pattern that is not completely the same.

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

9. The touch panel according to claim 5, characterized in that: The first type of electrode layer is a driving electrode layer, and the second type of electrode layer is a sensing electrode layer; or, The first type of electrode layer is the sensing electrode layer, and the second type of electrode layer is the driving electrode layer.

10. A touch display device, characterized in that: include: Display screen; and A touch panel as claimed in any one of claims 1 to 9.

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