Touch panel and touch display device

Abstract

The present application provides a touch panel and a touch display device. The touch panel has a touch area. The touch panel includes at least two stacked first-type electrode layers, each of which includes a first-type touch sensing area. The first-type touch sensing areas of the at least two first-type electrode layers are spliced ​​together to fill the touch area. Embodiments of the present application increase the discernibility of touch signals by arranging the first-type electrode layers in a multi-layer structure.

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] Nowadays, electronic products are indispensable in people's daily lives, especially electronic products with touch functions. As people's demand for electronic products increases, the touch requirements for touch products are also getting higher and higher.

[0003] However, the existing touch panel technology is limited by its own structure, resulting in that during actual operation, the touch sensitivity or accuracy may not meet the usage requirements, the signal recognition is poor, and the user experience is reduced. Summary of the Invention

[0004] In view of this, embodiments of the present application provide a touch panel and a touch display device, which can enhance the recognition of touch signals.

[0005] In a first aspect, the present application provides a touch panel having a touch area, the touch panel comprising: at least two stacked first-type electrode layers, the first-type electrode layers comprising a first-type touch sensing area, and the first-type touch sensing areas respectively included in the at least two first-type electrode layers being spliced ​​to fill the touch area.

[0006] In one embodiment of the present application, the first type of touch sensing area includes a plurality of first type electrodes extending along a first direction, and the plurality of first type electrodes are patterned metal grid electrodes.

[0007] In an embodiment of the present application, the first-type electrodes included in each of the at least two first-type electrode layers adopt different polygonal metal grid patterns.

[0008] In one embodiment of the present application, at least one optical adhesive layer is further included for bonding at least two first-type electrode layers, and the at least two first-type electrode layers are bonded together by means of the at least one optical adhesive layer.

[0009] In one embodiment of the present application, it further includes at least one substrate for carrying at least two first-type electrode layers, and the at least two first-type electrode layers are respectively arranged on different surfaces of the at least one substrate.

[0010] In an embodiment of the present application, at least two second-type electrode layers are stacked, the second-type electrode layers include a second-type touch sensing area, and the second-type touch sensing areas of the at least two second-type electrode layers are spliced ​​to fill the touch area.

[0011] In one embodiment of the present application, the second type touch sensing area includes multiple second type electrodes extending along the second direction, the multiple second type electrodes are patterned metal grid electrodes, and the multiple second type electrodes included in at least two layers of second type electrode each adopt different polygonal metal grid patterns.

[0012] 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.

[0013] In one 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 the driving electrode layer.

[0014] In a second aspect, an embodiment of the present application provides a touch display device, which includes a display screen and the touch panel described in the first aspect.

[0015] In the embodiment of the present application, a type of electrodes in the touch electrodes are arranged in different layers so that the distances from the touch capacitor unit to the finger at different positions in the touch area are not exactly the same, and the spacing between the two electrodes constituting the capacitor unit is also not exactly the same. This achieves the goal of not exactly the same sensing signals when the finger touches different positions, thereby helping to identify the touch position and improving the signal recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG2 is a schematic diagram of the structure of a touch panel provided by an embodiment of the present application from a top view perspective.

[0017] Figure 2 FIG2 is a schematic structural diagram of a touch panel provided in another embodiment of the present application from a top view perspective.

[0018] Figure 3 FIG. 1 is a schematic structural diagram of a patterned metal grid electrode provided in one embodiment of the present application.

[0019] Figure 4 Shown is a schematic structural diagram of a patterned metal grid electrode provided in another embodiment of the present application.

[0020] Figure 5 Shown is a schematic structural diagram of a patterned metal grid electrode provided in yet another embodiment of the present application.

[0021] Figure 6 FIG2 is a schematic structural diagram of at least two first-type electrode layers provided in an embodiment of the present application from a main viewing angle.

[0022] Figure 7 FIG2 is a schematic structural diagram of a touch panel provided in another embodiment of the present application from a top view perspective.

[0023] Figure 8 FIG2 is a schematic structural diagram of a touch panel provided in another embodiment of the present application from a top view perspective.

[0024] Figure 9 FIG2 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.

[0025] Figure 10 FIG. 1 is a schematic structural diagram of a three-dimensional structure of a touch panel provided in an embodiment of the present application.

[0026] Figure 11 FIG2 is a schematic structural diagram of a three-dimensional structure of a touch panel provided in another embodiment of the present application.

[0027] Figure 12 FIG2 is a structural diagram of the main viewing angle of a touch display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Figure 1 FIG. 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. 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 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)) are included. Each of the first-type electrode layers 1 (or 2) includes a first-type touch sensing area. The first-type touch sensing areas of the two first-type electrode layers (i.e., first-type electrode layer 1 in (a) and first-type electrode layer 2 in (b)) are combined to form the touch area of ​​the touch panel.

[0030] Specifically, Figure 1 The top-down direction shown is the direction perpendicular to the touch panel from top to bottom. The number of layers of the first type of electrode layer stacked 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. The embodiment of the present application does not make specific limitations on this.

[0031] Continue to refer to Figure 1As shown, the two stacked first-type electrode layers can be stacked by 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 is a touch area formed by a combination of multiple first-type electrodes 11 extending along the first direction A, 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 is a touch area formed by a combination of multiple first-type electrodes 21 extending along the first direction A, and any two adjacent first-type electrodes 21 are not connected to each other. The first-type touch sensing area formed by the combination of multiple first-type electrodes 11 and the first-type touch sensing area formed by the combination of multiple first-type electrodes 21 are spliced ​​and fill the entire touch area. In other words, the multiple first-type electrodes 11 and the multiple first-type electrodes 21 do not overlap and just fill the entire touch area.

[0032] The touch area can be the central area of ​​the touch panel, which is equivalent to the display area of ​​the touch screen. The touch area can also be understood as an area formed by combining multiple first-type touch sensing areas.

[0033] 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 in the figure). 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 included in the two first type electrode layers can be equal (ie, the touch sensing areas are evenly divided, see Figure 1 ), or they may not be equal. 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.

[0034] In one example, the first type of electrode layer mentioned above can be either a driving electrode layer or a sensing electrode layer.

[0035] It should be noted that the touch panel provided in the embodiment of the present application further includes a plurality of metal leads 12 (or 22), and the plurality of first-type electrodes 11 are electrically connected to the plurality of metal leads 12. One first-type electrode 11 is electrically connected to one metal lead 12 (or one first-type electrode 21 is electrically connected to one metal lead 22). The plurality of metal leads 12 thus formed are all gathered in a certain area on at least one side of the touch panel (which can be the top, bottom, left, or right side of the touch panel) to connect to the touch chip, thereby connecting the first-type electrodes 11 to the touch chip.

[0036] The metal leads 12 have a width of 4 μm to 15 μm and can be made of silver, copper, or nano-conductive powder (powder particles are 10 nm to 100 nm). The metal leads 12 can be prepared by screen printing, laser etching, 3D printing, or other methods.

[0037] It should be understood that Figure 1 The number of first type electrode layers shown is the same, Figure 2 It also includes two first-type electrode layers, namely, first-type electrode 1 in Figure (a) and first-type electrode 2 in Figure (b). The first-type electrode layer 1 in (a) includes a first-type touch sensing area composed of multiple first-type electrodes 11 that have a certain angle with the first direction A, and multiple metal leads 12 electrically connected to the multiple first-type electrodes 11. The first-type electrode layer 2 in (b) also includes a first-type touch sensing area composed of multiple first-type electrodes 21 that have a certain angle with the first direction A, and multiple metal leads 22 electrically connected to the multiple first-type electrodes 21. Furthermore, the first-type touch sensing area formed by the combination of the multiple first-type electrodes 11 and the first-type touch sensing area formed by the combination of the multiple first-type electrodes 21 can be spliced ​​together to fill the entire touch area.

[0038] Compared to existing technologies, mutual capacitance touch sensors consist of a layer of drive electrodes and a layer of sense electrodes. This means that electrodes of the same type (electrodes extending in the same direction) are all arranged in the same electrode layer (e.g., all drive electrodes are arranged in a single drive electrode layer). This results in minimal capacitance differences at different locations within the touch area, leading to low recognition accuracy when identifying the touch location. However, the present embodiment arranges one type of touch electrode in different layers, so that the distance from the touch capacitor unit to the finger at different locations within the touch area is not exactly the same, and the spacing between the two electrodes that make up the capacitor unit is also not exactly the same. This ensures that the sensing signals are not exactly the same when the finger touches different locations, thereby assisting in identifying the touch location and improving signal recognition.

[0039] In one embodiment of the present application, the first type of touch sensing area includes a plurality of first type electrodes extending along a first direction, and the plurality of first type electrodes are patterned metal grid electrodes.

[0040] Specifically, see Figure 1 , the first direction A and the second direction B are perpendicular to each other, and the first direction A or the second direction B can be the X-axis direction (horizontal) or the Y-axis direction (vertical) of a two-dimensional rectangular coordinate system. That is, when the first direction A refers to the X-axis direction (horizontal), the second direction B refers to the Y-axis direction (vertical); when the first direction A refers to the Y-axis direction (vertical), the second direction B refers to the X-axis direction (horizontal).

[0041] The first type of touch sensing area includes a plurality of first type electrodes extending along the first direction A, that is, it may include a plurality of first type electrodes extending laterally. In other embodiments, the first type of touch sensing area may also include a plurality of first type electrodes extending at a certain angle to the first direction A (for example, Figure 2 The first type of electrode 11 or the first type of electrode 21 shown in FIG. 1 ). The actual contour structure of the first type of electrode can be a bar, a diamond, or a triangle. Those skilled in the art can design a specific contour structure based on actual application requirements. At the same time, the embodiments of the present application do not limit the actual internal pattern of the first type of electrode. The internal pattern can be various types of grids. Those skilled in the art can design the internal pattern of the first type of electrode based on actual application requirements.

[0042] In one example, the first type of electrode layer is a driving electrode layer, and the first type of electrodes are driving electrodes.

[0043] In one example, the first type of electrode layer is a sensing electrode layer, and the first type of electrodes are sensing electrodes.

[0044] The material of the metal grid electrode can be at least one of Cu, Ag, Al, Ti, or Ni. The grid pattern of the metal grid layer can be rectangular, square, diamond, or other polygonal. The embodiments of the present application do 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, due to the thin metal wires, the human eye cannot perceive the metal wires. That is, the metal grid appears transparent to the human eye and does not affect the transparency of the entire touch panel.

[0045] In an embodiment of the present application, the first-type electrodes included in each of the at least two first-type electrode layers adopt different polygonal metal grid patterns.

[0046] Specifically, the polygonal metal grid pattern may be an irregular polygonal metal grid 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 3 ; or at least one edge of the polygon can be a curve or a polyline, for example Figure 4 ; 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 the metal lines in the patterned metal grid electrode are at least partially non-straight lines, for example Figure 5 (The dotted lines in the figure represent the arrangement of the metal wires). This application does not specifically limit the irregular polygonal pattern.

[0047] 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 various 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 the other 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 the other first-class electrode layer.

[0048] In this embodiment, the light transmittance of the touch panel is increased by configuring at least two first-type electrode layers as patterned metal mesh electrodes using relatively thin metal wires. Furthermore, by configuring at least two first-type electrode layers as differently patterned metal mesh electrodes, this embodiment avoids interference fringes. Furthermore, since different metal mesh patterns may result in different electrode resistances, this in turn results in different capacitance values ​​in different areas, further enhancing the discernibility of the sensing signal.

[0049] In one embodiment of the present application, the touch panel further includes at least one optical adhesive layer for bonding the at least two first-type electrode layers, and the at least two first-type electrode layers are bonded together by means of the at least one optical adhesive layer.

[0050] Specifically, the number of optical adhesive layers is proportional to the number of first-type electrode layers. The greater the number of first-type electrode layers, the more optical adhesive layers are required for bonding. For example, when there are two first-type optical adhesive layers, the number of optical adhesive layers is one; when there are three first-type optical adhesive layers, the number of optical adhesive layers is two.

[0051] It should be understood that in the embodiment of the present application, at least two first-type electrode layers can be produced simultaneously on different production lines without affecting each other, and only in the final assembly stage are the at least two first-type electrode layers pasted together into a touch panel using optical glue.

[0052] The optical adhesive used for bonding can be fully bonded using OCA optical adhesive material (Optically Clear Adhesive). OCA is colorless and transparent, has a light transmittance of more than 90%, is mature in technology, has good bonding effect, does not produce an air layer, can reduce 8% of reflection, and improves the display effect. Moreover, through the setting of OCA, when impacted by external force, OCA can also absorb and release part of the external force to reduce the impact of the external force on the touch panel, further improve the impact resistance of the touch panel, and thus improve the impact resistance of the touch panel. However, the optical adhesive in the embodiment of the present application can also use OCR optical adhesive material (Optically Clear Resin). OCR has a lower bonding cost and a higher light transmittance after bonding. At the same time, it is simple to disassemble and has a high regeneration yield after disassembly. In this regard, the embodiment of the present application does not specifically limit the material of the optical adhesive.

[0053] Preferably, the optical adhesive in the embodiment of the present application adopts OCA optical adhesive material.

[0054] It can be seen from this that the embodiment of the present application adheres at least two first-type electrode layers with optical glue, thereby enhancing the transmittance of the touch panel, and absorbing and releasing external forces through the optical glue, thereby reducing the impact of external forces on the touch panel and improving the impact resistance of the touch panel.

[0055] In one embodiment of the present application, the touch panel further includes at least one substrate for carrying at least two first-type electrode layers, and the at least two first-type electrode layers are respectively disposed on different surfaces of the at least one substrate.

[0056] Specifically, if Figure 6 As described above, the substrate 5 is equivalent to the carrier corresponding to the first type electrode layer 1 and the first type electrode layer 2. The first type electrode layer 1 and the first type electrode layer 2 can be respectively provided on both sides of the substrate 5 by means of a yellow light process or sputtering. The number of layers of the substrate increases with the increase of the number of layers of the first type electrode layer. For example, when the number of layers of the first type electrode layer is two, the number of layers of the substrate is one; when the number of layers of the first type electrode layer is three, the number of layers of the substrate is two. A plurality of first type electrodes are formed on one surface of the substrate 5 (for example, see Figure 2 A first type electrode 11 is formed on the substrate 5 to obtain a first type electrode layer 1, and a plurality of first type electrodes are also formed on the other surface of the substrate 5 to obtain another first type electrode layer 2. In the embodiment of the present application, the two layers of electrodes can be produced simultaneously on different production lines without affecting each other.

[0057] It should be noted that the substrate may be made of any transparent plastic material, including PET (Polyethylene terephthalate), PC (Polycarbonate), PMMA (Polymethyl methacrylate), COP (Optical Material Cop), TCTF (Transparent Conductive Transfer Film), TAC (Triacetyl Cellulose), and the like, and is not specifically limited in this embodiment of the present application. PET plastic has excellent physical and mechanical properties over a wide temperature range, excellent electrical insulation, and even at high temperatures and high frequencies, maintains good electrical properties and exhibits excellent dimensional stability.

[0058] Preferably, the material of the substrate in the embodiment of the present application is PET plastic material.

[0059] It can be seen from this that the two first-type electrode layers in the embodiment of the present application use the correspondingly arranged substrate as a carrier, which can reduce the overall thickness of the touch panel, thereby making the touch panel lighter and thinner.

[0060] 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 illustrated embodiments and Figure 1 The differences and similarities between the illustrated embodiments are not described in detail.

[0061] like Figure 7 As shown, the touch panel has a touch area and includes: two stacked first-type electrode layers and two second-type electrode layers. The first-type electrode layers are two layers: one first-type electrode layer 1 and another first-type electrode layer 2; the second-type electrode layers are two layers: one second-type electrode layer 3 and another second-type electrode layer 4. Each second-type electrode layer 3 (or 4) includes a second-type touch sensing area. The second-type touch sensing areas of the two second-type electrode layers are combined to fill the entire touch area.

[0062] 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, four or more layers, which is not specifically limited in the embodiment of the present application.

[0063] In the second-type electrode layer 3, the second-type touch sensing area refers to the touch area formed by a combination of multiple second-type electrodes 31 extending along the second direction B, with any two adjacent second-type electrodes 31 not connected to each other. In the second-type electrode layer 4, the second-type touch sensing area refers to the touch area formed by a combination of multiple second-type electrodes 41 extending along the second direction B, with any two adjacent second-type electrodes 41 not connected to each other. The second-type touch sensing area formed by the multiple second-type electrodes 31 and the second-type touch sensing area formed by the multiple second-type electrodes 41 are combined to completely fill the touch area of ​​the touch panel.

[0064] The touch area can be the central area of ​​the touch panel, which is equivalent to the display area of ​​the touch screen. The touch area can be understood as an area formed by combining multiple second-type touch sensing areas.

[0065] The second touch sensing area may include a plurality of second electrodes 31 (or 41) parallel to the second direction B, or may include a plurality of second electrodes (eg, Figure 8 The second type of electrodes 31 or 41 in the two second type of electrode layers can have the same size of the second type of touch sensing area (i.e., the touch sensing area is evenly divided) or different sizes. The shape of the second type of 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.

[0066] The following combination Figures 9 to 11 An example of stacking the first type electrode layer and the second type electrode layer included in the touch panel is given.

[0067] See also Figure 9 The touch area is completely filled with both the first and second electrode layers. In other words, the multiple first electrodes 11 and 21 extending along the first direction do not overlap and completely fill the touch area. Simultaneously, the multiple second electrodes 31 and 41 extending along the second direction do not overlap and completely fill the touch area. In other words, any area of ​​the touch area corresponds to both a first and a second electrode layer for signal sensing. Due to the height differences between the electrode layers, the signals sensed by each electrode layer are distinct, thereby improving signal recognition.

[0068] 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.

[0069] 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.

[0070] In addition, refer to Figure 7 The electrode layers are labeled as shown. Figure 9 The stacking order of the two first-type electrode layers 1 and 2 and the two second-type electrode layers 3 and 4 in the vertical direction of the touch panel in the touch panel structure shown is 3, 1, 4, 2. It should be noted that the stacking order between the first-type electrode layers and the second-type electrode layers can be varied. Figure 7 The four electrode layers are numbered 1 to 4, and the stacking order in the vertical direction of the touch panel can be 1, 2, 3 and 4, for example. Figure 10 Among 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 one 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.

[0071] 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 Figure 11 Among them, 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.

[0072] In addition, it should be noted that if Figure 7 The four electrode layers shown are numbered 1 to 4. 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.

[0073] In one example, the present invention forms a touch panel by bonding two double-layer metal grid electrodes together through an optical adhesive layer. It should be noted that the present invention is not limited to a structure of double-layer metal grid electrodes; two double-layer metal grid electrodes are just one way to combine four electrode layers.

[0074] For example, see Figure 7, the first type electrode layer 1 in (a) and the second type electrode layer 3 in (c) can form a double-layer metal mesh electrode, the first type electrode layer 2 in (b) and the second type electrode layer 4 in (d) can form another double-layer metal mesh electrode, and they are 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) can form a double-layer metal mesh electrode, the second type electrode layer 3 in (c) and the second type electrode layer 4 in (d) can form another double-layer metal mesh electrode, and they are 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) can form a double-layer metal mesh electrode, the second type electrode layer 3 in (c) and the first type electrode layer 2 in (b) can form another double-layer metal mesh electrode, and they are glued together by an optical adhesive layer.

[0075] In one example, see Figure 12 , both double-layer metal grid electrodes also include a substrate.

[0076] Specifically, the number of substrate layers is two, namely, a first substrate 5 and a second substrate 6. The first substrate 5 is equivalent to a carrier of two first-type electrode layers, which can be prepared by a process such as a yellow light process, or by a method such as sputtering. A plurality of first-type electrodes (for example, see Figure 2 A first type electrode 11 is formed on the first substrate 5 to obtain a first type electrode layer 1, and a plurality of first type electrodes are also formed on the other surface of the first substrate 5 to obtain another first type electrode layer, thereby obtaining a double-layer metal grid electrode.

[0077] The second substrate 6 is equivalent to the carrier of the two second-type electrode layers, and can be prepared by a process such as yellow light processing, or by sputtering. A plurality of second-type electrodes (for example, see Figure 7 A second type of electrode 31 is formed on the second substrate 6 to obtain a second type of electrode layer 3, and a plurality of first type electrodes are also formed on the other surface of the second substrate 6 to obtain another second type of electrode layer 4, thereby obtaining another double-layer metal grid electrode.

[0078] The two double-layer metal grid electrodes are bonded together by an optical adhesive layer 7 .

[0079] Exemplarily, the electrode layer 1 can also be arranged on the surface of the cover plate away from the touch panel (such as the lower surface), the electrode layers 2 and 3 are respectively arranged on the upper and lower surfaces of the first substrate, and the electrode layer 4 is arranged on the upper surface of the second substrate, and then the cover plate, the first substrate and the second substrate are glued together by OCA glue.

[0080] In one example, both double-layer metal mesh electrodes further include an optical adhesive layer.

[0081] Specifically, there are three optical adhesive layers. The first optical adhesive layer is used to bond two electrode layers of one double-layer metal grid electrode. The second optical adhesive layer is used to bond two electrode layers of another double-layer metal grid electrode. The third optical adhesive layer is used to bond the two double-layer metal grid electrodes.

[0082] 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.

[0083] 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 this application can also be indium tin oxide electrodes, i.e., ITO electrodes. In view of the fact that in practical applications, metal grid electrodes and ITO electrodes each have advantages and disadvantages, i.e., ITO electrodes have good transparency but high impedance, while metal grid electrodes have low impedance but low transmittance, the multiple first-type electrodes and the multiple second-type electrodes can be composed of different materials, for example, the first-type electrodes use metal grid electrodes, and the second-type electrodes use ITO electrodes. However, it should be noted that the embodiments of this 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.

[0084] Continue to see Figure 7 , the touch panel also includes a plurality of metal leads 12 (22, 32 or 42), and the plurality of first-type electrodes 11 are electrically connected to the plurality of metal leads 12 respectively. One first-type electrode 11 is electrically connected to one metal lead 12 (or one first-type electrode 21 is electrically connected to one metal lead 22), and the plurality of metal leads 12 formed thereby are all gathered in a certain area of ​​at least one side of the touch panel (which can 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. The material of the plurality of metal leads is the same as Figure 1 The description of the embodiment is basically the same, please refer to Figure 1 The relevant records will not be repeated here.

[0085] It should also 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 one on top of the other. 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). The first-type electrode layer 1 in (a) includes a first-type touch sensing area composed of multiple first-type electrodes 11 with a certain angle relative to the first direction A, and multiple metal leads 12 electrically connected to the multiple first-type electrodes 11. The first-type electrode layer 2 in (b) also includes a first-type touch sensing area composed of multiple first-type electrodes 21 with a certain angle relative to the first direction A, and multiple metal leads 22 electrically connected to the multiple first-type electrodes 21. The second-type electrode layer 3 in (c) includes a second-type touch sensing area composed of multiple second-type electrodes 31 with a certain angle relative to the second direction B, and multiple metal leads 32 electrically connected to the multiple second-type electrodes 31. In (d), the second-type electrode layer 4 also includes a second-type touch sensing area composed of multiple second-type electrodes 41 that are angled with the second direction B, and multiple metal leads 42 electrically connected to the multiple second-type electrodes 41. This 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 completely fills the area.

[0086] It can be seen from this that the structure of the touch panel provided in the embodiment of the present application can make the signals sensed by the finger on the four electrode layers different, thereby improving the signal recognition.

[0087] In one embodiment of the present application, the second type touch sensing area includes multiple second type electrodes extending along the second direction, the multiple second type electrodes are patterned metal grid electrodes, and the multiple second type electrodes included in at least two layers of second type electrode each adopt different polygonal metal grid patterns.

[0088] 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.

[0089] 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.

[0090] Figure 12 The figure shows a schematic diagram of the main viewing angle of the touch display device provided by an embodiment of the present application. Figure 12As shown, the touch display device includes two first-type electrode layers, namely, one first-type electrode layer 1 and another first-type electrode layer 2. Furthermore, the touch display device also includes two second-type electrode layers, namely, one second-type electrode layer 3 and another second-type electrode layer 4. Furthermore, the touch display device also includes two substrates, namely, a first substrate 5 and a second substrate 6, an optical adhesive layer 7, and a display screen 8.

[0091] Specifically, the main viewing direction is a direction parallel to the touch display device.

[0092] The touch display device includes 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 order of arranging the two first-type electrode layers and the two second-type electrode layers can be set according to actual needs and is not specifically limited in this embodiment of the present application.

[0093] 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 power, 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, and is suitable for a variety of working conditions and display shapes.

[0094] It should be noted that the embodiments of the present application include the touch panel of any of the above embodiments.

[0095] It can be seen from this that the embodiment of the present application provides four electrode layers so that during actual operation, the sensing signals generated when a finger touches the four electrode layers are different, thereby improving the signal recognition.

[0096] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot 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 such feature.

[0098] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection 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 without overlap, each of the at least two first-type electrode layers comprising its own first-type touch sensing area, and the first-type touch sensing areas of the at least two first-type electrode layers being spliced ​​to fill the touch area; At least two second-type electrode layers are stacked without overlap, each of the at least two second-type electrode layers includes its own second-type touch sensing area, and the second-type touch sensing areas included in each of the at least two second-type electrode layers are spliced ​​to fill the touch area.

2. The touch panel according to claim 1, wherein: The first-type touch sensing area includes a plurality of first-type electrodes extending along a first direction, and the plurality of first-type electrodes are patterned metal grid electrodes.

3. The touch panel according to claim 2, wherein: The first-type electrodes included in each of the at least two first-type electrode layers adopt different polygonal metal grid patterns.

4. The touch panel according to any one of claims 1 to 3, wherein: It also includes at least one optical adhesive layer for bonding the at least two first-type electrode layers, and the at least two first-type electrode layers are bonded together by means of the at least one optical adhesive layer.

5. The touch panel according to any one of claims 1 to 3, wherein: It also includes at least one substrate for carrying the at least two first-type electrode layers, and the at least two first-type electrode layers are respectively arranged on different surfaces of the at least one substrate.

6. The touch panel according to claim 1, wherein: The second type touch sensing area includes a plurality of second type electrodes extending along a second direction. 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 different polygonal metal grid patterns.

7. The touch panel according to claim 1, wherein: 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.

8. The touch panel according to claim 1, wherein: 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.

9. A touch display device, characterized in that: include: Display screen; and The touch panel according to any one of claims 1 to 8.

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