Touch display substrate, driving method thereof and touch display device

Abstract

The invention discloses a touch display substrate, a driving method thereof and a touch display device. The touch display substrate comprises a substrate body (101), a touch lead layer (11), an anode conducting layer (12) and a cathode conducting layer (13), the touch lead layer (11), the anode conducting layer (12) and the cathode conducting layer (13) are arranged on the substrate body (101), on the plane perpendicular to the substrate body, the anode conducting layer (12) is located between the touch lead layer (11) and the cathode conducting layer (13), the anode conducting layer (12) comprises a plurality of switching connection electrodes (12-1), the touch lead layer (11) comprises a plurality of touch leads (11-1), and the switching connection electrodes (12-1) are connected with the switching connection electrodes (12-1). The cathode conducting layer (13) comprises a plurality of cathodes (13-1); the plurality of cathodes (13-1) are multiplexed into a plurality of touch electrodes (13-1), the plurality of touch electrodes (13-1) are electrically connected with a plurality of touch leads (11-1) through a plurality of switching connection electrodes (12-1), and at least part of the touch leads (11-1) are located in a display area (AA) of the touch display substrate.

Description

Touch display substrate and driving method thereof, and touch display device Technical Field

[0001] The present disclosure relates to, but is not limited to, the field of display technology, and in particular to a touch display substrate and a driving method thereof, and a touch display device. Background Art

[0002] With the rapid development of display technology, touch screens have become increasingly ubiquitous in people's lives. Based on their structure, touch screens can be categorized as add-on, on-cell, or in-cell. Based on their operating principle, they can be divided into capacitive, resistive, infrared, and surface acoustic wave types. Capacitive touch screens utilize the human body's current induction phenomenon to operate, supporting multi-touch. They also offer advantages such as wear resistance, long life, and low power consumption. Consequently, they have experienced rapid growth and are widely used in electronic products such as mobile phones, tablets, laptops, televisions, monitors, digital photo frames, and navigation systems.

[0003] Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] An exemplary embodiment of the present disclosure provides a touch display substrate, comprising a substrate, and a touch lead layer, an anode conductive layer, and a cathode conductive layer disposed on the substrate. In a plane perpendicular to the substrate, the anode conductive layer is located between the touch lead layer and the cathode conductive layer. The anode conductive layer includes a plurality of transfer connection electrodes, the touch lead layer includes a plurality of touch leads, and the cathode conductive layer includes a plurality of cathodes.

[0006] The plurality of cathodes are reused as a plurality of touch electrodes, and the plurality of touch electrodes are electrically connected to the plurality of touch leads through the plurality of transfer connection electrodes. At least some of the touch leads are located in the display area of ​​the touch display substrate.

[0007] In an exemplary embodiment, the anode conductive layer further includes a plurality of virtual electrodes, and the plurality of virtual electrodes and the plurality of transfer connection electrodes form an electrode array arranged in rows and columns.

[0008] In an exemplary embodiment, the multiple touch electrodes are arranged in an array, the orthographic projections of the multiple virtual electrodes and the multiple transfer connection electrodes on the substrate are located within the range of the orthographic projections of the multiple touch electrodes on the substrate, and the electrode array includes multiple electrode sub-arrays corresponding to the multiple touch electrodes.

[0009] In an exemplary embodiment, a pixel definition layer is provided between the anode conductive layer and the cathode conductive layer, the pixel definition layer is provided with a plurality of first transfer vias, and the plurality of touch electrodes are electrically connected to the plurality of transfer connection electrodes through the plurality of first transfer vias; a flat layer is provided between the touch lead layer and the anode conductive layer, the flat layer is provided with a plurality of second transfer vias, and the plurality of transfer connection electrodes are electrically connected to the plurality of touch leads through the plurality of second transfer vias.

[0010] In an exemplary embodiment, the pixel definition layer is further provided with a plurality of first virtual vias, and the orthographic projections of the plurality of first virtual vias on the substrate are respectively located within the range of the orthographic projections of the plurality of virtual electrodes on the substrate; the orthographic projections of the plurality of first transfer vias on the substrate are respectively located within the range of the orthographic projections of the corresponding plurality of transfer connection electrodes on the substrate.

[0011] In an exemplary embodiment, the multiple first virtual vias and the multiple first transfer vias form a first via array arranged in rows and columns, the first via array includes multiple first via sub-arrays corresponding to the multiple touch electrodes respectively, and the vias in the multiple first via sub-arrays are arranged in a consistent manner.

[0012] In an exemplary embodiment, on a plane parallel to the display substrate, the aperture size of the first transfer vias along the column direction is 20 micrometers to 40 micrometers, and the aperture size of the first transfer vias along the row direction is 40 micrometers to 80 micrometers.

[0013] In an exemplary embodiment, the flat layer is further provided with a plurality of second virtual vias, and the orthographic projections of the plurality of second virtual vias on the substrate are respectively located within the range of the orthographic projections of the plurality of virtual electrodes on the substrate; the orthographic projections of the plurality of second transfer vias on the substrate are respectively located within the range of the orthographic projections of the plurality of transfer connection electrodes on the substrate.

[0014] In an exemplary embodiment, the plurality of second virtual vias and the plurality of second transfer vias form a second via array arranged in rows and columns, the second via array includes a plurality of second via sub-arrays corresponding to the plurality of touch electrodes, respectively, and the vias in the plurality of second via sub-arrays are arranged in a consistent manner.

[0015] In an exemplary embodiment, one cathode is electrically connected to at least one touch lead, one touch lead is electrically connected to one of the cathodes, and cathodes in different rows receive different second power supply voltages from corresponding touch leads.

[0016] In an exemplary embodiment, the touch display substrate includes the display area and a binding area located on one side of the display area. In the direction from the binding area to the display area, the absolute values ​​of the second power supply voltages received by the multiple rows of cathodes from the corresponding touch leads increase sequentially.

[0017] In an exemplary embodiment, a cathode is electrically connected to a plurality of touch leads through a plurality of transfer connection electrodes;

[0018] The same cathode receives the same second power supply voltage from multiple touch leads; or, in the direction from the binding area to the display area, the transfer connection electrodes corresponding to the multiple touch leads electrically connected to the same cathode are arranged in sequence, and the absolute values ​​of the second power supply voltages received by the multiple touch leads increase in sequence.

[0019] In an exemplary embodiment, two adjacent touch electrodes in the same row are staggered in the column direction so that the gap between the cathodes of two adjacent columns is not in a straight line; two adjacent touch electrodes in the same column are staggered in the row direction so that the gap between the cathodes of two adjacent rows is not in a straight line.

[0020] In an exemplary embodiment, a plurality of protrusions are arranged at edge positions of the cathodes in an irregular manner, so that the gaps between two adjacent rows of cathodes and the gaps between two adjacent columns of cathodes are not aligned in a straight line.

[0021] In an exemplary embodiment, the touch display substrate includes the display area and a binding area located on one side of the display area, the multiple touch leads extend from the binding area to the display area, and in the direction from the binding area to the display area, the multiple touch leads pass through the display area.

[0022] In an exemplary embodiment, the display area is provided with a plurality of pixel units arranged in an array, and any pixel unit corresponds to a virtual electrode or a transfer connection electrode.

[0023] In an exemplary embodiment, the touch display substrate includes a driving circuit layer arranged on the base, the driving circuit layer is located between the anode conductive layer and the base, and the driving circuit layer includes one or more source-drain metal layers, one of which is reused as the touch lead layer.

[0024] In an exemplary embodiment, on a plane parallel to the touch display substrate, the plurality of touch leads extend along a second direction and are evenly arranged along a first direction, and the first direction intersects the second direction.

[0025] An exemplary embodiment of the present disclosure further provides a touch display device, comprising the touch display substrate described in any one of the above embodiments.

[0026] An exemplary embodiment of the present disclosure further provides a method for driving a touch display substrate, which is applied to the touch display substrate described in any of the above embodiments. The touch display substrate includes a substrate and a touch lead layer, an anode conductive layer, and a cathode conductive layer provided on the substrate. In a plane perpendicular to the substrate, the anode conductive layer is located between the touch lead layer and the cathode conductive layer. The anode conductive layer includes a plurality of transfer connection electrodes, the touch lead layer includes a plurality of touch leads, and the cathode conductive layer includes a plurality of cathodes arranged in an array. The plurality of cathodes are multiplexed into a plurality of touch electrodes, and the plurality of touch electrodes are electrically connected to the plurality of touch leads via the plurality of transfer connection electrodes. At least some of the touch leads are located in a display area of ​​the touch display substrate and extend to a binding area located on one side of the display area. The method includes:

[0027] Different second power supply voltages are provided to the touch leads electrically connected to the cathodes of different rows.

[0028] In an exemplary embodiment, providing different second power supply voltages to the touch leads electrically connected to cathodes of different rows includes:

[0029] The absolute values ​​of the second power supply voltages provided to the plurality of rows of cathodes sequentially arranged in a direction from the binding area to the display area through the plurality of touch leads are increased sequentially.

[0030] In an exemplary embodiment, a cathode is electrically connected to a plurality of touch leads through a plurality of transfer connection electrodes;

[0031] The second power supply voltage provided to multiple touch leads electrically connected to the same cathode is the same; or, the absolute values ​​of the second power supply voltage provided to multiple touch leads electrically connected to the same cathode in sequence from the binding area to the display area are increased in sequence.

[0032] In an exemplary embodiment, the method further comprises:

[0033] receiving a touch sensing signal from a touch lead;

[0034] A touch driving signal is provided to the corresponding touch lead according to the touch sensing signal.

[0035] Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are intended to provide a further understanding of the technical solutions of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solutions of the present disclosure and do not constitute a limitation of the technical solutions of the present disclosure. The shapes and sizes of the components in the drawings do not reflect the actual scale and are intended only to illustrate the contents of the present disclosure.

[0037] FIG1 is a schematic diagram of a planar structure of a touch display device;

[0038] FIG2 is a schematic structural diagram of a binding region;

[0039] FIG3 is a schematic structural diagram of an edge area;

[0040] FIG4 is a schematic diagram of a cross-sectional structure of a touch display device;

[0041] FIG5 is a schematic cross-sectional view of a touch display substrate provided in an embodiment of the present disclosure;

[0042] FIG6 is a schematic diagram of a planar structure of a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0043] FIG7 is a schematic cross-sectional view of a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0044] FIG8 is a schematic cross-sectional view of a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0045] FIG9 is a schematic diagram of a planar structure of a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0046] FIG10 a discloses a schematic planar structural diagram of a touch display substrate provided by an exemplary embodiment;

[0047] FIG10 b is a schematic diagram of a planar structure of a touch lead layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0048] FIG10c is a schematic diagram of a planar structure of an anode conductive layer and a pixel definition layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0049] FIG11 a discloses a schematic planar structural diagram of a touch display substrate provided by an exemplary embodiment;

[0050] FIG11 b is a schematic diagram of a planar structure of a touch lead layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0051] FIG12 a is a diagram showing simulation results of an LRU of a touch display substrate;

[0052] FIG12 b is a diagram showing simulation results of an LRU of a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0053] FIG13a is a schematic cross-sectional view of a touch display substrate after forming a driving circuit layer according to an exemplary embodiment of the present disclosure;

[0054] FIG13 b is a schematic cross-sectional view of a touch display substrate after forming a driving circuit layer according to an exemplary embodiment of the present disclosure;

[0055] FIG13c is a schematic diagram of a cross-sectional structure after forming an anode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0056] FIG13 d is a schematic diagram of a cross-sectional structure after forming a light-emitting layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0057] FIG13e is a schematic diagram of a cross-sectional structure of a touch display substrate after removing the light-emitting layer in the first transfer via hole provided by an exemplary embodiment of the present disclosure;

[0058] FIG13f is a schematic cross-sectional view of a touch display substrate after an anode conductive layer is formed, provided by an exemplary embodiment of the present disclosure;

[0059] FIG13g is a schematic diagram of a cross-sectional structure after forming an anode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0060] FIG14a is a schematic diagram of a planar structure of a cathode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0061] FIG14 b is a schematic diagram of a planar structure of a cathode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0062] FIG14c is a schematic diagram of a planar structure of a cathode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0063] FIG14d is a schematic diagram of a planar structure of a cathode conductive layer in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0064] FIG15 is a timing diagram of the working process of a pixel driving circuit in a touch display substrate provided by an exemplary embodiment of the present disclosure;

[0065] FIG16 is an equivalent circuit diagram of a pixel driving circuit in a touch display substrate provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0066] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments can be implemented in a variety of different forms. A person skilled in the art can easily understand that the methods and contents can be transformed into various forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other in any way.

[0067] In the drawings, the sizes of various components, layer thicknesses, or regions may be exaggerated for clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to these dimensions, and the shapes and sizes of the components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and one embodiment of the present disclosure is not limited to the shapes or numerical values ​​shown in the drawings.

[0068] In this specification, ordinal numbers such as “first”, “second” and “third” are provided to avoid confusion among constituent elements, and are not intended to limit the number.

[0069] In this specification, for convenience, words and phrases indicating orientation or positional relationships, such as "middle," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside," are used to illustrate the positional relationships of constituent elements with reference to the accompanying drawings. This is merely for the purpose of facilitating the description of this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present disclosure. The positional relationships of constituent elements may be appropriately changed depending on the direction in which each constituent element is described. Therefore, the present disclosure is not limited to the words and phrases described in the specification and may be appropriately replaced according to the circumstances.

[0070] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections, indirect connections through intermediaries, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0071] In this specification, a transistor refers to a device that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, the channel region refers to the region through which current primarily flows.

[0072] In this specification, the first electrode can be a drain electrode and the second electrode can be a source electrode, or vice versa. The functions of "source electrode" and "drain electrode" may be interchanged when using transistors with opposite polarity or when the direction of current changes during circuit operation. Therefore, in this specification, "source electrode" and "drain electrode" may be interchanged.

[0073] In this specification, "electrically connected" includes components connected together via an element having some electrical function. There are no particular limitations on the "element having some electrical function" as long as it enables the transfer of electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with various functions.

[0074] In this specification, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus also includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus also includes a state where the angle is greater than 85° and less than 95°.

[0075] In this specification, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may be replaced with "conductive film." Similarly, "insulating film" may be replaced with "insulating layer."

[0076] The term "about" in the present disclosure refers to a numerical value that is not strictly defined and allows for process and measurement errors.

[0077] Capacitive on-cell touch panels are primarily categorized into mutual capacitance and self-capacitance structures. Mutual capacitance structures employ overlapping or adjacent drive and sensing electrodes to form mutual capacitance, utilizing changes in mutual capacitance for position detection. Self-capacitance structures utilize self-capacitance between the touch electrodes and the human body, utilizing changes in self-capacitance for position detection. Self-capacitive touch panels are single-layer structures characterized by low power consumption and a simple structure, while mutual capacitance touch panels are multi-layer structures with multi-touch capabilities.

[0078] In an exemplary embodiment, the touch display device may include a display substrate arranged on a substrate and a touch panel arranged on the display substrate. The display substrate may be a liquid crystal display (LCD) substrate, or may be an organic light emitting diode (OLED) display substrate, or may be a plasma display device (PDP) display substrate, or may be an electrophoretic display (EPD) display substrate. In an exemplary embodiment, the display substrate is an OLED display substrate, and the OLED display substrate may include a substrate, a driving circuit layer arranged on the substrate, a light emitting structure layer arranged on the driving circuit layer, and an encapsulation layer arranged on the light emitting structure layer. The touch panel is arranged on the encapsulation layer of the display substrate to form a touch structure on thin film encapsulation (Touch on Thin Film Encapsulation, referred to as Touch on TFE) structure. The display structure and the touch structure are integrated together, and have the advantages of being light, thin, and foldable, and can meet the product requirements of flexible folding, narrow frame, etc.

[0079] Currently, Touch on TFE structures primarily include the Flexible Multi Layer On Cell (FMLOC) and Flexible Single Layer On Cell (FSLOC) structures. The FMLOC structure is based on the principle of mutual capacitance detection, typically using two layers of metal to form the drive (Tx) and sense (Rx) electrodes. The integrated circuit (IC) detects the mutual capacitance between the drive and sense electrodes to achieve touch control. The FSLOC structure is based on the principle of self-capacitance (or voltage) detection, typically using a single layer of metal to form the touch electrodes. The IC detects the self-capacitance (or voltage) of the touch electrodes to achieve touch control.

[0080] Figure 1 is a schematic diagram of the planar structure of a touch display device, in which a touch panel is arranged on a display panel to form an FMLOC structure. In a plane parallel to the touch panel, the touch panel includes an effective area (AA), a binding area located on one side of the effective area, and an edge area located on the other side of the effective area. For the stacked display panel and touch panel, the effective area can be either the touch area of ​​the touch panel or the display area of ​​the display panel. The touch area and display area in the following description both refer to the effective area. In an exemplary embodiment, the touch area 100 includes at least a plurality of regularly arranged touch electrodes, the edge area 300 includes at least a plurality of touch leads, and the binding area 200 includes at least pins for connecting the touch leads to an external control device.

[0081] In an exemplary embodiment, the touch panel may be a mutual capacitance structure. The touch area 100 may include a plurality of first touch units 110 and a plurality of second touch units 120. The first touch units 110 have a linear shape extending along a first direction D1, and the plurality of first touch units 110 are arranged in sequence along a second direction D2. The second touch units 120 have a linear shape extending along the second direction D2, and the plurality of second touch units 120 are arranged in sequence along the first direction D1, with the first direction D1 intersecting the second direction D2. Each first touch unit 110 includes a plurality of first touch electrodes 111 and a first connecting portion 112 arranged in sequence along the first direction D1. The first touch electrodes 111 and the first connecting portion 112 are alternately arranged and connected in sequence. Each second touch unit 120 includes a plurality of second touch electrodes 121 arranged in sequence along the second direction D2. The plurality of second touch electrodes 121 are spaced apart, and adjacent second touch electrodes 121 are connected to each other via second connecting portions 122. In an exemplary embodiment, the second connection portion 122 is located in a different film layer from the first touch electrodes 111 and the second touch electrodes 121. The first touch electrodes 111 and the second touch electrodes 121 are alternately arranged in a third direction D3 that intersects the first direction D1 and the second direction D2.

[0082] In an exemplary embodiment, the plurality of first touch electrodes 111, the plurality of second touch electrodes 121, and the plurality of first connecting portions 112 may be disposed on the same layer in the touch layer and may be formed through the same patterning process. The first touch electrodes 111 and the first connecting portions 112 may be interconnected as a single unitary structure. The second connecting portions 122 may be disposed on a bridging layer, with adjacent second touch electrodes 121 interconnected via vias, with an insulating layer disposed between the touch layer and the bridging layer. In some possible implementations, the plurality of first touch electrodes 111, the plurality of second touch electrodes 121, and the plurality of second connecting portions 122 may be disposed on the same layer in the touch layer. The second touch electrodes 121 and the second connecting portions 122 may be interconnected as a single unitary structure. The first connecting portions 112 may be disposed on the bridging layer, with adjacent first touch electrodes 111 interconnected via vias. In an exemplary embodiment, the first touch electrodes may be drive (Tx) electrodes, and the second touch electrodes may be sense (Rx) electrodes. Alternatively, the first touch electrode may be a sensing (Rx) electrode, and the second touch electrode may be a driving (Tx) electrode.

[0083] In an exemplary embodiment, the first touch electrode 111 and the second touch electrode 121 may have a rhombus shape, for example, a regular rhombus, a horizontally elongated rhombus, or a vertically elongated rhombus. In some possible implementations, the first touch electrode 111 and the second touch electrode 121 may have any one or more of a triangle, a square, a trapezoid, a parallelogram, a pentagon, a hexagon, and other polygonal shapes, which are not limited in this disclosure.

[0084] In one exemplary embodiment, the first touch electrodes 111 and the second touch electrodes 121 may be transparent conductive electrodes. In another exemplary embodiment, the first touch electrodes 111 and the second touch electrodes 121 may be metal meshes. The metal meshes are formed by interweaving a plurality of metal wires. The metal meshes include multiple mesh patterns, each of which is a polygonal shape formed by the plurality of metal wires. The metal mesh-type first touch electrodes 111 and the second touch electrodes 121 have advantages such as low resistance, small thickness, and fast response speed.

[0085] FIG2 is a schematic diagram of the structure of a binding area. As shown in FIG2 , in an exemplary embodiment, the binding area 200 is located on one side of the touch area 100. Along the direction (second direction D2) away from the touch area 100, the binding area 200 may include a first fan-out area 201, a bending area 202, a second fan-out area 203, an anti-static area 204, a driver chip area 205, and a binding pin area 206. The first fan-out area 201 can be used to set the signal transmission lines of the display panel and the touch leads of the touch panel. The signal transmission lines of the display panel include at least a first power line (VDD), a second power line (VSS), and multiple data transmission lines. The multiple data transmission lines are configured to connect to the data lines of the display panel in a fan-out routing manner. The first power line VDD and the second power line VSS are configured to connect to the high-level power line and the low-level power line of the display panel, respectively. The multiple touch leads of the touch panel are configured to be connected to the multiple pins of the binding pin area 206. The bending area 202 may be provided with a groove configured to bend the second fan-out area 203, the anti-static area 204, the driver chip area 205, and the binding pin area 206 to the back of the touch area 100. The second fan-out area 203 may be provided with multiple touch leads and multiple data transmission lines led out in a fan-out routing manner.

[0086] The anti-static area 204 may be provided with an anti-static circuit configured to eliminate static electricity.

[0087] The driver chip area 205 may be provided with a source driver circuit (Driver IC), which is configured to connect to multiple data transmission lines of the second fan-out area 203. The binding pin area 206 may be provided with multiple pins (PINs), which are correspondingly connected to multiple touch leads and multiple display signal lines of the source driver circuit. The binding pin area 206 is configured to be bound and connected to a flexible printed circuit board (FPC) 400.

[0088] In an exemplary embodiment, the flexible printed circuit board 200 includes at least a touch driving circuit (Touch IC) 410 and a connector (Connector) 420 . A plurality of touch leads are connected to the touch driving circuit 410 , and a plurality of display signal lines are connected to the connector 420 .

[0089] In an exemplary embodiment, a first cutting line 601 and a second cutting line 602 are further provided outside the binding region 200. The second cutting line 602 is a fine cutting line located outside the binding region 200, and its shape is identical to the outline of the binding region 200. The first cutting line 601 is a rough cutting line located outside the second cutting line 602, and its shape is identical to the outline of the second cutting line 602. After the film layer processing is completed, the cutting equipment cuts along the first cutting line 601 (the rough cutting line). After the testing is completed, the cutting equipment cuts along the second cutting line 602 (the fine cutting line), forming the display panel and the touch panel.

[0090] Figure 3 is a schematic diagram of the structure of an edge region. As shown in Figure 3, in an exemplary embodiment, the edge region 300 is located on all sides of the touch region 100, except for the side where the binding region 200 is located. In an exemplary embodiment, the first touch electrode 111 is a sensing (Rx) electrode, and the second touch electrode 121 is a driving (Tx) electrode. In an exemplary embodiment, a plurality of sensing (Rx) leads 301 and a plurality of driving (Tx) leads 302 are provided in the edge region 300. The first ends of the driving leads 302 are connected to the driving electrodes, and the second ends of the driving leads 302 extend to one side of the binding region 200. The first ends of the sensing leads 301 are connected to the sensing electrodes, and the second ends of the sensing leads 301 extend along the edge region 300 to the other side of the binding region 200. In an exemplary embodiment, the sensing leads 301 and the driving leads 302 together constitute the touch leads.

[0091] Figure 4 is a schematic cross-sectional view of a touch display device, illustrating the structure of three sub-pixels. As shown in Figure 4, the touch panel is disposed on the display panel. In an exemplary embodiment, on a plane perpendicular to the display panel, the display panel may include a driving circuit layer 102 disposed on a substrate 101, a light-emitting device 103 disposed on a side of the driving circuit layer 102 away from the substrate 101, and an encapsulation layer 104 disposed on a side of the light-emitting device 103 away from the substrate 101. In some possible implementations, the display panel may include other film layers, such as spacers, etc., which are not limited in this disclosure.

[0092] In an exemplary embodiment, the substrate may be a flexible substrate or a rigid substrate. The flexible substrate may include a first flexible material layer, a first inorganic material layer, a semiconductor layer, a second flexible material layer, and a second inorganic material layer stacked together. The first flexible material layer and the second flexible material layer may be made of polyimide (PI), polyethylene terephthalate (PET), or a surface-treated polymer soft film. The first inorganic material layer and the second inorganic material layer may be made of silicon nitride (SiNx) or silicon oxide (SiOx) to improve the substrate's resistance to water and oxygen. The semiconductor layer may be made of amorphous silicon (a-Si).

[0093] In an exemplary embodiment, the driving circuit layer 102 of each sub-pixel may include multiple transistors and storage capacitors that constitute the pixel driving circuit. FIG4 illustrates an example of each sub-pixel including one driving transistor and one storage capacitor. In some possible implementations, the driving circuit layer 102 of each sub-pixel may include: a first insulating layer disposed on a substrate; an active layer disposed on the first insulating layer; a second insulating layer covering the active layer; a gate electrode and a first capacitor electrode disposed on the second insulating layer; a third insulating layer covering the gate electrode and the first capacitor electrode; a second capacitor electrode disposed on the third insulating layer; a fourth insulating layer covering the second capacitor electrode, the second insulating layer, the third insulating layer, and the fourth insulating layer having vias formed therein, the vias exposing the active layer; a source electrode and a drain electrode disposed on the fourth insulating layer, the source electrode and the drain electrode being connected to the active layer via the vias; and a planar layer covering the aforementioned structure, the planar layer having vias formed therein, the vias exposing the drain electrode. The active layer, gate electrode, source electrode, and drain electrode constitute the driving transistor, and the first capacitor electrode and the second capacitor electrode constitute the storage capacitor.

[0094] In an exemplary embodiment, the light-emitting device 103 may include an anode, a pixel definition layer, an organic light-emitting layer, and a cathode. The anode is disposed on the planar layer and connected to the drain electrode of the driving transistor through a via hole provided in the planar layer. The pixel definition layer is disposed on the anode and the planar layer, and a pixel opening is provided in the pixel definition layer, exposing the anode. The organic light-emitting layer is at least partially disposed within the pixel opening and connected to the anode. The cathode is disposed on the organic light-emitting layer and connected to the organic light-emitting layer. The organic light-emitting layer emits light of a corresponding color when driven by the anode and cathode.

[0095] In an exemplary embodiment, the encapsulation layer 104 may include a stacked first encapsulation layer, a second encapsulation layer, and a third encapsulation layer. The first encapsulation layer and the third encapsulation layer may be made of inorganic materials, the second encapsulation layer may be made of organic materials, and the second encapsulation layer is arranged between the first encapsulation layer and the third encapsulation layer to ensure that external water vapor cannot enter the light-emitting device 103.

[0096] In an exemplary embodiment, the organic light-emitting layer of an OLED light-emitting element may include an emitting layer (EML), and one or more layers selected from the group consisting of a hole injection layer (HIL), a hole transport layer (HTL), a hole blocking layer (HBL), an electron blocking layer (EBL), an electron injection layer (EIL), and an electron transport layer (ETL). Driven by voltages from the anode and cathode, the organic material's luminescence properties are utilized to produce light in a desired grayscale.

[0097] In an exemplary embodiment, the light-emitting layers of OLED light-emitting elements of different colors are different. For example, the red light-emitting element includes a red light-emitting layer, the green light-emitting element includes a green light-emitting layer, and the blue light-emitting element includes a blue light-emitting layer. In order to reduce the difficulty of the process and improve the yield, the hole injection layer and the hole transport layer on one side of the light-emitting layer can adopt a common layer, and the electron injection layer and the electron transport layer on the other side of the light-emitting layer can adopt a common layer. In an exemplary embodiment, any one or more layers of the hole injection layer, the hole transport layer, the electron injection layer and the electron transport layer can be made by a single process (a single evaporation process or a single inkjet printing process), but isolation is achieved by means of a surface step difference of the formed film layer or by surface treatment. For example, any one or more layers of the hole injection layer, the hole transport layer, the electron injection layer and the electron transport layer corresponding to adjacent sub-pixels can be isolated. In an exemplary embodiment, the organic light-emitting layer can be formed by evaporation using a fine metal mask (FMM, Fine Metal Mask) or an open mask (Open Mask), or by an inkjet process.

[0098] In an exemplary embodiment, on a plane perpendicular to the touch panel, the touch panel may include a buffer layer 105 disposed on a side of the encapsulation layer 104 away from the substrate 101, a first metal mesh (TMA) layer 106 disposed on a side of the buffer layer 105 away from the substrate 101, an insulating layer 107 disposed on a side of the first metal mesh layer 106 away from the substrate 101, a second metal mesh (TMB) layer 108 disposed on a side of the insulating layer 107 away from the substrate 101, and a protective layer 109 disposed on a side of the second metal mesh layer 108 away from the substrate 101.

[0099] In an exemplary embodiment, the buffer layer 105 and the insulating layer 107 may be made of any one or more of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiON), and may be a single layer, a multilayer, or a composite layer. The first metal grid layer 106 and the second metal grid layer 108 may be made of a metal material, such as any one or more of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo), or alloys thereof. The protective layer 109 may be made of an organic material.

[0100] In an exemplary embodiment, the first metal mesh layer 106 can be called a bridging layer, the second metal mesh layer 108 can be called a touch layer, a plurality of first touch electrodes, second touch electrodes and first connecting portions can be arranged in the same layer on the touch layer, the second connecting portion can be arranged in the bridging layer, and adjacent second touch electrodes can be connected to each other through vias.

[0101] Currently, the integration of display devices is becoming increasingly higher. Touch display devices, which integrate both the display and touch control functions on a single panel, have become a development trend due to their low cost and thinness. However, with this increased integration, touch display devices face challenges such as higher production costs and the difficulty of designing narrow bezels.

[0102] An exemplary embodiment of the present disclosure provides a touch display substrate, which may include a substrate, and a touch lead layer, an anode conductive layer, and a cathode conductive layer disposed on the substrate. In a plane perpendicular to the substrate, the anode conductive layer is located between the touch lead layer and the cathode conductive layer. The anode conductive layer includes a plurality of transfer connection electrodes, the touch lead layer includes a plurality of touch leads, and the cathode conductive layer includes a plurality of cathodes.

[0103] The plurality of cathodes are reused as a plurality of touch electrodes, and the plurality of touch electrodes are electrically connected to the plurality of touch leads through the plurality of transfer connection electrodes. At least some of the touch leads are located in the display area of ​​the touch display substrate.

[0104] In the touch display substrate provided by the embodiment of the present disclosure, multiple cathodes are reused as touch electrodes, and the multiple touch electrodes are electrically connected to multiple touch leads located in the touch lead layer through multiple transfer connection electrodes in the anode conductive layer. At least some of the touch leads are located in the display area of ​​the touch display substrate, so that the multiple touch leads and cathodes in the touch display substrate do not need to occupy the frame, which greatly reduces the frame of the touch display substrate and reduces the difficulty of designing a narrow frame of the touch display substrate.

[0105] In the embodiment of the present disclosure, by multiplexing multiple cathodes into multiple touch electrodes, the manufacturing process of the touch display substrate can be simplified, the number of mask plates can be reduced, the manufacturing efficiency of the touch display substrate can be improved, the manufacturing cost can be reduced, and the touch display substrate can be made lighter and thinner.

[0106] As shown in FIG5 , the touch display substrate provided in the embodiment of the present disclosure may include a substrate 101 and a touch lead layer 11, an anode conductive layer 12, and a cathode conductive layer 13 disposed on the substrate 101. In a plane perpendicular to the substrate 101 (i.e., a fourth direction D4 in FIG5 ), the anode conductive layer 12 is located between the touch lead layer 11 and the cathode conductive layer 13. The anode conductive layer 12 includes a plurality of transfer connection electrodes 12-1, the touch lead layer 11 includes a plurality of touch leads 11-1, and the cathode conductive layer 13 includes a plurality of cathodes 13-1.

[0107] The cathodes 13 - 1 are multiplexed into touch electrodes, which are electrically connected to the touch leads 11 - 1 via the transfer electrodes 12 - 1 . At least some of the touch leads 11 - 1 are located in the display area AA of the touch display substrate.

[0108] In an exemplary embodiment, an orthographic projection of the touch lead 11 - 1 on the substrate 101 and an orthographic projection of at least a portion of the cathode 13 - 1 on the substrate 101 have an overlapping area.

[0109] In an exemplary embodiment, the display area AA may be a touch area or an active area of ​​the touch display substrate.

[0110] In an exemplary embodiment, as shown in Figure 5, the touch display substrate may include a driving circuit layer 102 arranged on a base 101, the driving circuit layer 105 is located between the anode conductive layer 12 and the base 101, and the driving circuit layer 102 may include one or more source-drain metal layers, one of which is reused as a touch lead layer 11.

[0111] In an exemplary embodiment, the driving circuit layer 102 in the touch display substrate may include a first source-drain metal layer and a second source-drain metal layer located on a side of the first source-drain metal layer away from the substrate 101. In this case, the touch lead layer 11 in FIG5 may be the second source-drain metal layer. Alternatively, the driving circuit layer 102 in the touch display substrate may include a first source-drain metal layer, a second source-drain metal layer, and a third source-drain metal layer, with the second source-drain metal layer located between the first and third source-drain metal layers, and the second source-drain metal layer located on a side of the first source-drain metal layer away from the substrate 101. In this case, the touch lead layer 11 in FIG5 may be the third source-drain metal layer. That is, in a direction perpendicular to the substrate 101, the touch lead layer 11 may be integrated into a conductive layer in the driving circuit layer 102 that is closest to the anode conductive layer 12.

[0112] The solution provided by the embodiment of the present disclosure can be called an In-cell FSLOC (In-cell Flexible Single Layer On Cell, FSLOC for short) structure, that is, a flexible single-layer covering surface structure in which touch leads are integrated in a display substrate. As shown in Figure 5, the touch display substrate may include a driving circuit layer 102 and a light-emitting device layer 103, wherein the touch lead layer 11 can be integrated in one of the source and drain metal layers in the driving circuit layer 102, and the transfer connection electrode 12-1 is integrated in the anode conductive layer 12 of the light-emitting device layer 103. The touch lead 11-1 can be prepared through a one-time process together with the pattern of the source and drain metal layer in which it is located, and the transfer connection electrode 12-1 and the anode in the anode conductive layer can be prepared through a one-time process. Compared with the flexible multi-layer covering surface (Flexible Multi Layer On Cell, FMLOC for short) structure in the related art, the solution provided by the embodiment of the present disclosure can save 4 mask plates in the preparation process, thereby saving at least four steps. In the FMLOC structure, in order to shield the signal interference between the touch layer and the metal wiring in the display panel, the cathode is usually set as a whole piece and extends to the frame area, resulting in the cathode occupying a large space in the frame area, which is not conducive to the narrow frame design of the touch display substrate. In contrast, in the In-cell FSLOC structure provided by the embodiment of the present disclosure, the cathode is divided into multiple and reused as multiple touch electrodes. The cathode does not need to extend to the frame area. Under the premise that there is no signal interference between the touch electrode and the metal wiring in the display panel and touch can be achieved, the space occupied by the cathode in the frame is reduced, which is conducive to the narrow frame design of the touch display substrate.

[0113] In an exemplary embodiment, as shown in FIG6 , the anode conductive layer 12 may further include a plurality of dummy electrodes 12-2, and the plurality of dummy electrodes 12-2 and the plurality of transfer connection electrodes 12-1 form an electrode array arranged in rows and columns, and the shape and size of the plurality of dummy electrodes 12-2 may be consistent with the plurality of transfer connection electrodes 12-1. By providing the dummy electrodes 12-2, the technical problem of display shadowing caused by inconsistent reflection of the anode conductive layer can be reduced, thereby improving the visibility of the touch display substrate. In an exemplary embodiment, the transfer connection electrode 12-1, the dummy electrode and the plurality of anodes can be formed by a single patterning process. In an exemplary embodiment, the plurality of dummy electrodes 12-2 are floating, that is, there is no electrical connection between the plurality of dummy electrodes 12-2 and the plurality of touch leads 11-1. In an exemplary embodiment, the plurality of dummy electrodes 12-2 are not electrically connected to the plurality of cathodes 13-1.

[0114] In an exemplary embodiment, as shown in FIG6 , the plurality of touch electrodes 13-1 are arranged in an array. The orthographic projections of the plurality of dummy electrodes 12-2 and the plurality of transfer connection electrodes 12-1 on the substrate 101 are located within the range of the orthographic projections of the plurality of touch electrodes 13-1 on the substrate 101. The electrode array may include a plurality of electrode sub-arrays corresponding to the plurality of touch electrodes 13-1, and the electrodes in the plurality of electrode sub-arrays are arranged in a consistent manner. The consistent arrangement of the electrodes (12-1 and 12-2) in the plurality of electrode sub-arrays corresponding to the plurality of touch electrodes 13-1 ensures consistent light reflection across the plurality of touch electrodes 13-1 in the touch display substrate, thereby improving the display quality of the touch display substrate.

[0115] In an exemplary embodiment, an orthographic projection of each touch lead 11 - 1 on the substrate 101 may have an overlapping area with an orthographic projection of a plurality of cathodes 13 - 1 in one column of cathodes on the substrate 101 .

[0116] In an exemplary embodiment, as shown in Figures 5 to 7, a pixel definition layer c2 is provided between the anode conductive layer 12 and the cathode conductive layer 13, and the pixel definition layer c2 is provided with a plurality of first transfer vias K1, and the plurality of touch electrodes 13-1 are electrically connected to the plurality of transfer connection electrodes 12-1 through the plurality of first transfer vias K1; a flat layer c1 is provided between the touch lead layer 11 and the anode conductive layer 12, and a plurality of second transfer vias K2 are provided on the flat layer c1, and the plurality of transfer connection electrodes 12-1 are electrically connected to the plurality of touch leads 11-1 through the plurality of second transfer vias K2.

[0117] In an exemplary embodiment, an orthographic projection of the first transfer via K1 on the substrate 101 does not overlap with an orthographic projection of the second transfer via K2 on the substrate 101 .

[0118] In an exemplary embodiment, as shown in FIG6 , the same cathode 13 - 1 may be electrically connected to one of the touch leads 11 - 1 through a plurality of first transfer vias K1 and a plurality of transfer connection electrodes 12 - 1 .

[0119] In an exemplary embodiment, as shown in Figures 6 to 8, the pixel definition layer c2 is further provided with a plurality of first virtual vias K10, and the orthographic projections of the plurality of first virtual vias K10 on the substrate 101 are respectively located within the range of the orthographic projections of the plurality of virtual electrodes 12-2 on the substrate 101; the orthographic projections of the plurality of first transfer vias K1 on the substrate 101 are respectively located within the range of the orthographic projections of the corresponding plurality of transfer connection electrodes 12-1 on the substrate 101.

[0120] In an exemplary embodiment, a light-emitting layer c3 is provided between the pixel definition layer c2 and the cathode conductive layer 13. As shown in Figures 7 and 8, the light-emitting layer c3 in the multiple first virtual vias K10 may not be removed; as shown in Figure 5, the light-emitting layer c3 in the multiple first transfer vias K1 is removed so that the transfer connection electrode 12-1 is electrically connected to the corresponding touch electrode 13-1.

[0121] In an exemplary embodiment, as shown in FIG6 , a plurality of first virtual vias K10 and a plurality of first transfer vias K1 form a first via array arranged in rows and columns. The first via array includes a plurality of first via sub-arrays corresponding to the plurality of touch electrodes 13 - 1 , respectively. The vias in the plurality of first via sub-arrays are arranged in a consistent manner so that the vias in the touch display substrate are evenly distributed to avoid macroscopic defects of the vias.

[0122] In an exemplary embodiment, as shown in Figure 8, the flat layer c1 may also be provided with a plurality of second virtual vias K20, and the orthographic projections of the plurality of second virtual vias K20 on the substrate 101 are respectively located within the range of the orthographic projections of the plurality of virtual electrodes 12-2 on the substrate 101; the orthographic projections of the plurality of second transfer vias K2 on the substrate 101 are respectively located within the range of the orthographic projections of the plurality of transfer connection electrodes 12-1 on the substrate 101.

[0123] In an exemplary embodiment, a plurality of second virtual vias K20 and a plurality of second transfer vias K2 can form a second via array arranged in rows and columns. The second via array includes a plurality of second via sub-arrays corresponding to the plurality of touch electrodes 13-1, respectively. The vias in the plurality of second via sub-arrays are arranged in a consistent manner so that the vias in the touch display substrate are evenly distributed to avoid macroscopic defects of the vias.

[0124] In an exemplary embodiment, as shown in FIG8 , the orthographic projections of the plurality of second virtual vias K20 on the substrate 101 do not overlap with the orthographic projections of the plurality of second transfer vias K2 on the substrate 101 ; the orthographic projections of the plurality of first virtual vias K10 on the substrate 101 do not overlap with the orthographic projections of the plurality of first transfer vias K1 on the substrate 101 .

[0125] In an exemplary embodiment, as shown in FIG. 8 , there is no overlapping area between the orthographic projections of the plurality of second dummy via holes K20 on the substrate 101 and the orthographic projections of the plurality of first dummy via holes K10 on the substrate 101 .

[0126] In an exemplary embodiment, as shown in FIGS. 5 and 8 , the plurality of second dummy via holes K20 do not penetrate the planar layer c1 ; or the depth of the plurality of second dummy via holes K20 is smaller than the depth of the plurality of second via holes K2 .

[0127] In an exemplary embodiment, as shown in Figures 5 and 8, the width of the plurality of second dummy vias K20 is smaller than that of the plurality of first dummy vias K10; designing relatively small second dummy vias K20 is conducive to ensuring the flatness of the touch layer (ie, the cathode conductive layer 13).

[0128] In an exemplary embodiment, as shown in FIG6 , one cathode 13-1 is electrically connected to at least one touch lead 11-1, and one touch lead 11-1 is electrically connected to one of the cathodes 13-1. The cathodes 13-1 located in different rows receive different second power supply voltages from the corresponding touch leads 11-1, and the multiple touch electrodes 13-1 are independently controlled.

[0129] In an exemplary embodiment, as shown in FIG6 , the touch display substrate may include a display area AA and a binding area 200 located on one side of the display area AA. In a direction from the binding area 200 to the display area AA (the opposite direction of the second direction D2 in FIG6 ), the absolute values ​​of the second power supply voltages received by the multiple rows of cathodes 13 - 1 from the corresponding touch leads 11 - 1 increase sequentially.

[0130] In an exemplary embodiment, as shown in FIG6 , the absolute values ​​of the second power supply voltages received by the multiple rows of cathodes 13-1 from the corresponding touch leads 11-1 increase in sequence from the bonding area 200 to the display area AA (opposite to the second direction D2 in FIG6 ). The absolute value difference between the second power supply voltages in adjacent areas (for example, display areas AA1 and AA2) is approximately 0.0001V to 0.5V. This difference should not be too large, as it can easily lead to noticeable differences in normal display brightness and poor display quality.

[0131] In an exemplary embodiment, as shown in FIG6 , the binding area 200 may be provided with a touch control chip (TIC) 410, and the touch driver chip 410 may be the aforementioned touch driver circuit (Touch IC) 410. In an exemplary embodiment, as shown in FIG6 , multiple touch chips 410 may be provided based on the size of the touch display substrate to drive multiple touch electrodes 13-1. In an exemplary embodiment, one end of multiple touch leads 11-1 is electrically connected to the touch driver circuit 410 in the binding area 200, and the other end extends in a direction from the binding area 200 to the display area AA and is electrically connected to one of the touch electrodes 13-1. The touch driver circuit 410 may provide a second power supply voltage signal to the corresponding touch electrode 13-1 via the touch lead 11-1, receive a touch sensing signal from the corresponding touch electrode 11-1, and transmit a touch driver signal to the corresponding touch electrode 11-1.

[0132] In some embodiments, one end of multiple touch leads 11-1 is electrically connected to the touch drive circuit 410 in the binding area 200, and the other end extends in the direction from the binding area 200 to the display area AA and is electrically connected to one of the touch electrodes 13-1. The positive projection of at least one or all of the touch leads 11-1 on the substrate 101 overlaps with the positive projection of the touch electrode 13-1 in the same column direction on the substrate 101, that is, the touch lead 11-1 is electrically connected to the touch drive circuit 410 through the area where the touch electrode 13-1 is located, does not occupy the surrounding area, and does not occupy the area between adjacent touch electrodes 13-1, which is conducive to achieving a narrow frame.

[0133] In the embodiment of the present disclosure, in the direction from the binding area 200 to the display area AA, the absolute value of the second power supply voltage provided by the touch drive circuit 410 to the multiple rows of cathodes 13-1 through the touch lead 11-1 increases successively, which can overcome the different second power supply voltages received by multiple cathodes due to voltage drops, so that the second power supply voltages provided to multiple sub-pixels in the display substrate are as consistent as possible, which is beneficial to improving the uniformity of the panel, avoiding poor display of the display substrate, and ensuring the display effect of the display substrate.

[0134] In an exemplary embodiment, as shown in FIG6 and FIG9 , a cathode 13-1 can be electrically connected to a plurality of touch leads 11-1 through a plurality of transfer connection electrodes 12-1. In the structures shown in FIG6 and FIG9 , the second power supply voltage received by the same cathode 13-1 from the plurality of touch leads 11-1 can be the same. Alternatively, in the structure shown in FIG9 , the transfer connection electrodes 12-1 corresponding to the plurality of touch leads 11-1 electrically connected to the same cathode 13-1 are arranged sequentially in the direction from the binding area 200 to the display area AA (opposite to the second direction D2), and the absolute values ​​of the second power supply voltages received by the plurality of touch leads 11-1 increase sequentially. This prevents the same cathode 13-1 from providing different second power supply voltages to the plurality of sub-pixels due to a voltage drop, thereby ensuring that the second power supply voltages provided to the plurality of sub-pixels in the display substrate are as consistent as possible, thereby improving the uniformity of the panel, avoiding display defects of the display substrate, and ensuring the display effect of the display substrate. The maximum value of the absolute value of the second power supply voltage received in the same cathode is not greater than the minimum value of the absolute value of the second power supply voltage received by the cathode located on the side of the cathode away from the binding area 200; the minimum value of the absolute value of the second power supply voltage received in the same cathode is not lower than the maximum value of the absolute value of the second power supply voltage received by the cathode located between the cathode and the binding area 200.

[0135] In the embodiment of the present disclosure, compared with the structure in the related art in which the cathode is a whole piece, the cathode provided in the embodiment of the present disclosure is divided into multiple pieces, each cathode can be controlled independently, and a second power supply voltage is set for each cathode, which reduces the current flowing through the cathode and can overcome the problem of poor display effect caused by large cathode voltage drop.

[0136] In an exemplary embodiment, as shown in Figures 6 and 9 , multiple touch leads 11-1 extend from the binding area 200 to the display area AA. In this direction, the multiple touch leads 11-1 penetrate the display area AA. Specifically, the touch leads 11-1 extend from the binding area 200 to the display area AA and penetrate the side of the display area AA opposite the binding area 200. This ensures consistent light reflection from the touch leads 11-1 across the touch display substrate, preventing display shading caused by inconsistent light reflection from the touch leads 11-1 and improving the visibility of the touch display substrate.

[0137] In an exemplary embodiment, as shown in FIG10a, the display area AA is provided with a plurality of pixel units P arranged in an array. Each pixel unit P corresponds to a dummy electrode 12-2 or a transfer connection electrode 12-1. This ensures consistent light reflection across the electrodes of the plurality of pixel units, avoiding the problem of shadow cancellation caused by inconsistent light reflection, improving the visibility of the touch display substrate, and enhancing the display quality. As shown in FIG10, each pixel unit P may include at least three sub-pixels. FIG10 uses an example of a pixel unit P including three sub-pixels. Each pixel unit P may include a first sub-pixel P1, a second sub-pixel P2, and a third sub-pixel P3.

[0138] In an exemplary embodiment, Figures 10a to 10c illustrate a structure in which the second source / drain metal layer in the driver circuit layer 102 is reused as a touch wiring layer. Figure 10b illustrates a planar structure of the touch wiring layer 11. The touch wiring layer 11 may include a first power connection line 11-0. Two first power connection lines 11-0 are disposed between two adjacent touch wiring lines 11-1 in a plane parallel to the touch display substrate and in a first direction D1. The first power connection lines 11-0 are configured to provide a first power supply voltage to the sub-pixels. FIG10c is a schematic diagram of the planar structure of the anode conductive layer and the pixel definition layer. In an exemplary embodiment, the anode conductive layer may include a plurality of anodes, and the plurality of anodes may include a first anode 121 in the first sub-pixel P1, a second anode 122 in the second sub-pixel P2, and a third anode 123 in the third sub-pixel P3; the pixel definition layer may include pixel openings, and the plurality of pixel openings may include a first pixel opening c21 corresponding to the first sub-pixel P1, a second pixel opening c22 corresponding to the second sub-pixel P2, and a third pixel opening c23 corresponding to the third sub-pixel P13. The orthographic projection of each pixel opening on the substrate is within the range of the orthographic projection of the anode of the corresponding sub-pixel on the substrate; in an exemplary embodiment, a plurality of transfer connection electrodes 12-1 may be provided on the anode conductive layer 12. The pixel definition layer c2 is provided with a first transfer via K1 and a first dummy via K10. The orthographic projections of the first transfer vias K1 on the substrate are respectively located within the orthographic projections of the transfer connection electrodes 12-1 on the substrate, and the orthographic projections of the first dummy vias K10 on the substrate are respectively located within the orthographic projections of the dummy electrodes 12-2 on the substrate. As shown in Figures 10a and 10b, the orthographic projections of the second transfer vias K2 on the substrate provided on the flat layer c1 between the touch lead layer 11 and the anode conductive layer 12 can partially overlap with the orthographic projections of the first transfer vias K1 on the substrate. The orthographic projections of the second transfer vias K2 on the substrate are located within the orthographic projections of the corresponding touch lead 11-1 on the substrate.

[0139] In an exemplary embodiment, as shown in Figures 10a and 10c, on a plane parallel to the touch display substrate, in the second direction D, the first transfer via K1 and the first dummy via K10 can be arranged between two adjacent third sub-pixels P3, the first sub-pixels P1 and the second sub-pixels P2 are alternately arranged in the second direction D, and the third sub-pixels P3 and the transfer connection electrodes 12-1 or the dummy electrodes 12-2 are alternately arranged; in the first direction D, the transfer connection electrode 12-1 and the dummy electrode 12-2 are located between two adjacent columns of first sub-pixels P1.

[0140] In an exemplary embodiment, Figures 11a and 11b illustrate a structure in which the third source / drain metal layer in the driver circuit layer 102 is reused as the touch lead layer 11. This differs from Figures 10a to 10c in that the touch lead layer 11 no longer includes the anode connection electrode 11-2 and the data signal line 11-3. Instead, in the structure in which the third source / drain metal layer functions as the touch lead layer 11, only the first power connection line 11-0 and the touch lead 11-1 are provided. In a plane parallel to the touch display substrate and in a first direction D1, two first power connection lines 11-0 are provided between two adjacent touch leads 11-1. These first power connection lines 11-0 are configured to provide a first power supply voltage to the sub-pixels. The structures of the anode conductive layer 12 and the pixel definition layer c2 are consistent with those shown in Figures 10a and 10c. In the embodiment of the present disclosure, the third source-drain metal layer is reused as the touch lead layer 11, which can reduce the voltage drop of the first power connection line 11-0, and reduce the power consumption of the touch display substrate while reducing the frame. In addition, the FMLOC structure can be converted into an In-Cell FSLOC structure using the third source-drain metal layer in the present disclosure, which can simplify the difficulty of product conversion. For example, the In-Cell FSLOC structure can be realized by adding a third source-drain metal layer and a flat layer on the basis of the FMLOC structure.

[0141] In the planar structures shown in Figures 11a and 10a, each pixel unit P can be correspondingly provided with a transfer connection electrode 12-1 or a virtual electrode 12-2, which can make the electrode reflections in multiple pixel units consistent, avoiding the problem of display extinguishing caused by inconsistent electrode reflections, thereby improving the visibility of the touch display substrate.

[0142] In the embodiment of the present disclosure, the first power connection line 11 - 0 may be electrically connected to the first power line VDD, for receiving a first power voltage from the first power line VDD and providing the first power voltage to a plurality of sub-pixels in the display area AA.

[0143] In an exemplary embodiment, as shown in Figures 6 and 9, on a plane parallel to the touch display substrate, multiple touch leads 11-1 extend along the second direction D2 and are evenly arranged along the first direction D1. The first direction D1 intersects with the second direction D2, and the multiple touch leads 11-1 are evenly arranged along the first direction D1. This can avoid uneven display due to uneven distribution of the multiple touch leads 11-1, thereby improving the display effect.

[0144] In an exemplary embodiment, on a plane parallel to the display substrate, the aperture size of the first transfer via K1 along the second direction D2 (i.e., the column direction) is 20 to 40 microns, and the aperture size of the first transfer via K1 along the first direction D1 (i.e., the row direction) is 40 to 80 microns. Specifically, the aperture size of the first transfer via K1 is 20 microns * 40 microns to 40 microns * 80 microns, enabling good electrical connection between the cathode 13-1 and the transfer connection electrode 12-1. In an exemplary embodiment, the aperture size of the first transfer via K1 along the second direction D2 is 20 to 40 microns, and the aperture size of the first dummy via K10 along the first direction D2 is 40 to 80 microns. The aperture size of the first dummy via K10 along the first direction D2 is 40 to 80 microns. The aperture size of the first dummy via K10 is consistent with the aperture size of the first transfer via K1, ensuring uniform distribution of the vias in the touch display substrate and preventing macroscopic defects in the vias.

[0145] In an exemplary embodiment, Table 1 shows the test results of the voltage drop of the touch electrode 11-1 in the three display areas AA1, AA2, and AA3 arranged sequentially in the direction from the display area AA to the binding area 200 in the structure shown in Figure 6, the current distribution in the touch electrode 11-1 of the touch display substrate at a brightness of 400 nits, the voltage drop of the first power connection line 11-0, and the power consumption and long-range uniformity (LRU) of the brightness of the corresponding display areas.

[0146] Table 1

[0147] As can be seen from Table 1, by adopting the technical solution provided in the embodiment of the present disclosure in which the cathode is divided into multiple and reused as multiple touch electrodes 13-1, the voltage drop between the first power connection line 11-0 and the cathode 13-1 is very small, and the voltage drop in the three display areas AA1, AA2, and AA3 is basically the same. At a brightness of 400 nit, the current of the touch display substrate in the three display areas AA1, AA2, and AA3 is basically the same, and the LRU value is relatively high. It can be seen that the technical solution provided in the embodiment of the present disclosure has good display uniformity.

[0148] As shown in FIG12a , when the cathode is a whole piece, the LRU simulation result diagram is 84%; FIG12b shows the LRU simulation result diagram provided by the embodiment of the present disclosure in which the cathode is divided into multiple array-arranged electrodes and reused as touch electrodes, and the LRU simulation result can reach 99%. It can be seen that the solution provided by the embodiment of the present disclosure has good long-range uniformity in power consumption and brightness in the display area compared with the cathode as a whole structure.

[0149] The manufacturing process (method) of the touch display substrate in the embodiment of the present disclosure may be as shown in FIG. 13a to FIG. 13b, and may include:

[0150] Step H1: forming a driving circuit layer 102 on the substrate 101 .

[0151] In an exemplary embodiment, the method for forming the driving circuit layer 102 is the same as that in the related art, and the present disclosure will not provide detailed descriptions of the part. The difference between the forming of the driving circuit layer 102 in the embodiment of the present disclosure and the related art lies in the source and drain metal layer reused as the touch lead layer 11 and the flat layer c1 located between the touch lead layer 11 and the anode conductive layer 12.

[0152] In an exemplary embodiment, during the process of forming the source and drain metal layers reused as the touch wire layer 11 in the driving circuit layer 102, a touch wire 11-1 is added, and the touch wire 11-1 and the original conductive traces in the source and drain metal layers can be formed through a single patterning process.

[0153] In an exemplary embodiment, as shown in Figure 13a, multiple second transfer vias K2 are added during the formation of the planar layer between the touch lead layer 11 and the anode conductive layer 12. In this exemplary embodiment, these multiple second transfer vias K2 can be formed together with at least a portion of the other vias on the planar layer through a single patterning process. These multiple second transfer vias K2 expose the surfaces of the corresponding touch leads 11-1. Step H2: Form the anode conductive layer 12 on the side of the drive circuit layer 102 facing away from the substrate 101.

[0154] In an exemplary embodiment, as shown in Figure 13b, the anode conductive layer 12 may include multiple transition connection electrodes 12-1, multiple virtual electrodes 12-2 and multiple anodes (121, 122, 123) as shown in Figure 10c, and the planar structural schematic diagram of multiple transition connection electrodes 12-1 and multiple anodes may be as shown in Figure 10c.

[0155] Step H3: forming a pixel definition layer c2 on a side of the anode conductive layer 12 away from the substrate 101 .

[0156] In an exemplary embodiment, as shown in FIG13c , a first transfer via K1 and a first virtual via K10 are provided on the pixel definition layer c2. The first transfer via K1 and the first virtual via K10 can be formed together with a plurality of pixel openings (first pixel opening c21 , second pixel opening c22 , and third pixel opening c23 ) on the pixel definition layer c2 through a single patterning process. A schematic diagram of the planar structure of the first transfer via K1, the first virtual via K10, and the pixel openings can be shown in FIG10c .

[0157] Step H4: forming a light-emitting layer c3 on a side of the pixel definition layer c2 away from the substrate 101 .

[0158] 13d, the orthographic projections of the pixel opening, first transfer via K1, and first dummy via K10 on substrate 101 are within the orthographic projection of the light emitting layer c3 on substrate 101. In an exemplary embodiment, the light emitting layer c3 may be formed by evaporation.

[0159] Step H5: removing the light emitting layer c3 located in the first transfer via hole K1.

[0160] 13e, a laser etching process can be used to remove the light emitting layer c3 in the first transfer via K1 to expose the surface of the transfer connection electrode 12-1. In the embodiment of the present disclosure, the light emitting layer c3 in the first dummy via K10 can be removed or retained.

[0161] Step H6: forming a cathode conductive layer 13 on the side of the light emitting layer c3 away from the substrate 101 .

[0162] In an exemplary embodiment, as shown in FIG13f, the cathode conductive layer 13 may be electrically connected to the touch lead 11-1 via the transfer connection electrode 12-1, thereby providing a second power supply voltage to the cathode 13-1 via the touch lead 11-1 and receiving or transmitting a corresponding touch signal.

[0163] In an exemplary embodiment, as shown in FIG13g , multiple second dummy vias K20 may be added during the formation of the planar layer c1 in step H1. The orthographic projections of the multiple second dummy vias K20 on the substrate 101 are located within the orthographic projections of the corresponding touch leads 11-1 on the substrate 101. In this exemplary embodiment, a portion of the planar layer in the multiple second dummy vias K20 is removed, and the surfaces of the corresponding touch leads 11-1 are not exposed, thereby preventing electrical connection between the corresponding dummy electrodes 12-2 and the touch leads 11-1 at the corresponding locations. Providing multiple second dummy vias K20 can ensure a uniform distribution of vias in the touch display substrate, preventing macroscopic defects in the vias.

[0164] The cathode conductive layer 13 formed in step H6 can be as shown in Figures 14a to 14c. In Figure 14a, multiple cathodes 13-1 are arranged in an array. The gaps between two adjacent rows and the gaps between two adjacent columns in the structure shown in Figure 14 are visually a straight line and are easy to observe.

[0165] In an exemplary embodiment, in the structure shown in Figure 14b, two adjacent cathodes 13-1 (i.e., touch electrodes 13-1) located in the same row are staggered in the second direction D2 (i.e., the column direction) so that the gap between the two adjacent columns of cathodes 13-1 is not in a straight line, and two adjacent cathodes 13-1 located in the same column are staggered in the first direction D1 (i.e., the row direction) so that the gap between the two adjacent rows of cathodes is not in a straight line. This can avoid the gaps between the two adjacent rows of cathodes and the gaps between the two adjacent columns of cathodes in the multiple cathodes arranged in rows and columns from being visually a straight line, thereby improving the display effect of the touch display substrate.

[0166] In an exemplary embodiment, in an exemplary embodiment, in the structure shown in Figure 14c, among the multiple cathodes (touch electrodes 13-1) arranged in rows and columns, multiple protruding structures 13-2 are arranged at the edge position of each cathode in an irregular manner, so that the gap between two adjacent rows of cathodes and the gap between two adjacent columns of cathodes are not on a straight line, avoiding the gap between two adjacent rows of cathodes and the gap between two adjacent columns of cathodes from being a visible straight line in visual effect, thereby improving the display effect of the touch display substrate.

[0167] In an exemplary embodiment, the cathode arrangement in the cathode conductive layer 13 can be as shown in Figure 14d, where two adjacent cathodes 13-1 in the same row are staggered in the second direction D2, and two adjacent cathodes 13-1 in the same column are staggered in the first direction D1, and multiple protruding structures 13-2 are arranged at the edge position of each cathode in an irregular manner, so as to avoid the gap between two adjacent rows of cathodes and the gap between two adjacent columns of cathodes being a visible straight line in visual effect, thereby improving the visibility of the cathode and improving the display effect of the touch display substrate.

[0168] In the staggered arrangement shown in Figures 14b and 14d, the multiple cathodes 13-1 located in the same row are still roughly in the same row, and the multiple cathodes 13-2 located in the same column are still roughly in the same column. The size of the staggered arrangement is sufficient to avoid the gaps between adjacent rows and the gaps between adjacent columns from being visually straight. The size and shape of the raised structures 13-2 arranged in an irregular manner as shown in Figures 14c and 14d are sufficient to prevent the gaps between adjacent rows and the gaps between adjacent columns from being visually straight. The shape of the cathode 13-1 after the raised structures 13-2 are provided is consistent with the shape before the provision of Figure 13-2 (i.e., the main structure of the cathode does not change). For example, if the shape of the cathode 13-1 is a rectangular structure, the shape after the raised structures 13-2 are provided at the edge is roughly rectangular. In an exemplary embodiment, the shape of the protruding structure 13-2 can be one or more of a rectangle, a rounded corner, a triangle, and a polygonal structure with more than 3 sides. The shape of the protruding structure 13-2 can be an irregular shape, such as a polygon combination or an irregular polygon.

[0169] The present disclosure also provides a touch display device, which may include the touch display substrate described in any of the above embodiments. In an exemplary embodiment, the touch display device may be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system.

[0170] The present disclosure also provides a method for driving a touch display substrate, which is applied to the touch display substrate described in any of the above embodiments. The touch display substrate includes a substrate and a touch lead layer, an anode conductive layer, and a cathode conductive layer provided on the substrate. In a plane perpendicular to the substrate, the anode conductive layer is located between the touch lead layer and the cathode conductive layer. The anode conductive layer includes a plurality of transfer connection electrodes, the touch lead layer includes a plurality of touch leads, and the cathode conductive layer includes a plurality of cathodes arranged in an array. The plurality of cathodes are multiplexed into a plurality of touch electrodes, and the plurality of touch electrodes are electrically connected to the plurality of touch leads via the plurality of transfer connection electrodes. At least some of the touch leads are located in a display area of ​​the touch display substrate and extend to a binding area located on one side of the display area. The method includes:

[0171] Different second power supply voltages are provided to the touch leads electrically connected to the cathodes of different rows.

[0172] In an exemplary embodiment, providing different second power supply voltages to touch leads electrically connected to cathodes of different rows may include: increasing the absolute values ​​of the second power supply voltages provided to multiple rows of cathodes arranged sequentially in a direction from a binding area to a display area through multiple touch leads.

[0173] In an exemplary embodiment, a cathode is electrically connected to a plurality of touch leads through a plurality of transfer connection electrodes;

[0174] The second power supply voltage provided to multiple touch leads electrically connected to the same cathode is the same; or, the absolute values ​​of the second power supply voltage provided to multiple touch leads electrically connected to the same cathode in sequence from the binding area to the display area are increased in sequence.

[0175] In an exemplary embodiment, the method for driving a touch display substrate may further include:

[0176] receiving a touch sensing signal from a touch lead;

[0177] A touch driving signal is provided to the corresponding touch lead according to the touch sensing signal.

[0178] In an exemplary embodiment, the touch display substrate may include a plurality of sub-pixels arranged in an array, and the equivalent circuit diagram of the pixel driving circuit of each sub-pixel may be as shown in FIG16 . FIG15 is a timing diagram of the operation process of the pixel driving circuit shown in FIG16 , wherein the VSS signal is the signal provided by the touch lead 11-1 to the touch electrode 13-1 (i.e., the cathode 13-1). In the display stage, the touch chip 410 (i.e., the touch driving circuit 410) can provide the second power supply voltage VSS to the touch electrode 13-1 through the touch lead 11-1. In the touch stage, the touch chip 410 (i.e., the touch driving circuit 410) can receive the touch sensing signal from the touch electrode 13-1 through the touch lead 11-1, and provide the touch driving signal to the touch electrode 13-1 through the touch lead 11-1.

[0179] The touch display substrate and its driving method, as well as the touch display device provided by the embodiments of the present disclosure, have multiple cathodes in the touch display substrate reused as touch electrodes, and the multiple touch electrodes are electrically connected to multiple touch leads in the touch lead layer through multiple transfer connection electrodes in the anode conductive layer. The multiple touch leads are located in the display area of ​​the touch display substrate, so that the multiple touch leads and cathodes in the touch display substrate do not need to occupy the frame, thereby greatly reducing the frame of the touch display substrate and reducing the difficulty of designing a narrow frame of the touch display substrate.

[0180] The drawings in this disclosure only relate to the structures involved in this disclosure, and other structures may refer to general designs. In the absence of conflict, the embodiments of this disclosure, that is, the features in the embodiments, may be combined with each other to obtain new embodiments.

[0181] It should be understood by those skilled in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be included in the scope of the claims of the present disclosure.

Claims

1. A touch display substrate, comprising a substrate, a touch lead layer, an anode conductive layer and a cathode conductive layer arranged on the substrate, wherein the anode conductive layer is located between the touch lead layer and the cathode conductive layer on a plane perpendicular to the substrate, the anode conductive layer comprises a plurality of transfer connection electrodes, the touch lead layer comprises a plurality of touch leads, and the cathode conductive layer comprises a plurality of cathodes; The plurality of cathodes are reused as a plurality of touch electrodes, and the plurality of touch electrodes are electrically connected to the plurality of touch leads through the plurality of transfer connection electrodes, and at least some of the touch leads are located in the display area of ​​the touch display substrate.

2. The touch display substrate according to claim 1, wherein: The anode conductive layer further comprises a plurality of virtual electrodes, and the plurality of virtual electrodes and the plurality of transfer connection electrodes form an electrode array arranged in rows and columns.

3. The touch display substrate according to claim 2, wherein: The multiple touch electrodes are arranged in an array, the orthographic projections of the multiple virtual electrodes and the multiple transfer connection electrodes on the substrate are located within the range of the orthographic projections of the multiple touch electrodes on the substrate, and the electrode array includes multiple electrode sub-arrays corresponding to the multiple touch electrodes.

4. The touch display substrate according to claim 3, wherein: A pixel definition layer is provided between the anode conductive layer and the cathode conductive layer, the pixel definition layer is provided with a plurality of first transfer via holes, and the plurality of touch electrodes are electrically connected to the plurality of transfer connection electrodes through the plurality of first transfer via holes; A flat layer is provided between the touch lead layer and the anode conductive layer, a plurality of second transfer vias are provided on the flat layer, and the plurality of transfer connection electrodes are electrically connected to the plurality of touch leads through the plurality of second transfer vias.

5. The touch display substrate according to claim 4, wherein: The pixel definition layer is further provided with a plurality of first virtual via holes, and the orthographic projections of the plurality of first virtual via holes on the substrate are respectively located within the range of the orthographic projections of the plurality of virtual electrodes on the substrate; The orthographic projections of the plurality of first transfer vias on the substrate are respectively located within the range of the orthographic projections of the corresponding plurality of transfer connection electrodes on the substrate.

6. The touch display substrate according to claim 5, wherein: The multiple first virtual vias and the multiple first transfer vias form a first via array arranged in rows and columns, the first via array includes multiple first via sub-arrays corresponding to the multiple touch electrodes respectively, and the vias in the multiple first via sub-arrays are arranged in a consistent manner.

7. The touch display substrate according to claim 6, wherein: On a plane parallel to the display substrate, the aperture size of the first transfer vias along the column direction is 20 micrometers to 40 micrometers, and the aperture size of the first transfer vias along the row direction is 40 micrometers to 80 micrometers.

8. The touch display substrate according to claim 4, wherein: The flat layer is further provided with a plurality of second virtual via holes, and the orthographic projections of the plurality of second virtual via holes on the substrate are respectively located within the range of the orthographic projections of the plurality of virtual electrodes on the substrate; The orthographic projections of the plurality of second transfer vias on the substrate are respectively located within the range of the orthographic projections of the plurality of transfer connection electrodes on the substrate.

9. The touch display substrate according to claim 8, wherein: The plurality of second virtual vias and the plurality of second transfer vias form a second via array arranged in rows and columns, the second via array includes a plurality of second via sub-arrays corresponding to the plurality of touch electrodes respectively, and the vias in the plurality of second via sub-arrays are arranged in a consistent manner.

10. The touch display substrate according to claim 3, wherein: A cathode is electrically connected to at least one touch lead, a touch lead is electrically connected to one of the cathodes, and cathodes in different rows receive different second power supply voltages from corresponding touch leads.

11. The touch display substrate according to claim 10, wherein: The touch display substrate includes the display area and a binding area located at one side of the display area. In the direction from the binding area to the display area, the absolute values ​​of the second power supply voltages received by the plurality of rows of cathodes from the corresponding touch leads increase in sequence.

12. The touch display substrate according to claim 11, wherein: A cathode is electrically connected to a plurality of touch leads through a plurality of transfer connection electrodes; The same cathode receives the same second power supply voltage from multiple touch leads; or, in the direction from the binding area to the display area, the transfer connection electrodes corresponding to the multiple touch leads electrically connected to the same cathode are arranged in sequence, and the absolute values ​​of the second power supply voltages received by the multiple touch leads increase in sequence.

13. The touch display substrate according to claim 3, wherein: Two adjacent touch electrodes in the same row are staggered in the column direction so that the gap between the cathodes of two adjacent columns is not in a straight line; two adjacent touch electrodes in the same column are staggered in the row direction so that the gap between the cathodes of two adjacent rows is not in a straight line.

14. The touch display substrate according to claim 3 or 13, wherein: A plurality of protruding structures are arranged irregularly at the edge of the cathode, so that the gaps between two adjacent rows of cathodes and the gaps between two adjacent columns of cathodes are not in a straight line.

15. The touch display substrate according to claim 2, wherein: The touch display substrate includes the display area and a binding area located on one side of the display area. The multiple touch leads extend from the binding area to the display area. In the direction from the binding area to the display area, the multiple touch leads pass through the display area.

16. The touch display substrate according to claim 15, wherein: The display area is provided with a plurality of pixel units arranged in an array, and any pixel unit corresponds to a virtual electrode or a transfer connection electrode.

17. The touch display substrate according to any one of claims 1 to 13, 15 to 16, wherein: The touch display substrate includes a driving circuit layer disposed on the base, the driving circuit layer is located between the anode conductive layer and the base, and the driving circuit layer includes one or more source-drain metal layers, one of which is reused as the touch lead layer.

18. The touch display substrate according to claim 17, wherein: On a plane parallel to the touch display substrate, the plurality of touch leads extend along a second direction and are evenly arranged along a first direction, and the first direction intersects with the second direction.

19. A touch display device, comprising the touch display substrate according to any one of claims 1 to 18.

20. A method for driving a touch display substrate, applied to the touch display substrate according to any one of claims 1 to 19, the touch display substrate comprising a substrate and a touch lead layer, an anode conductive layer and a cathode conductive layer arranged on the substrate, the anode conductive layer being located between the touch lead layer and the cathode conductive layer on a plane perpendicular to the substrate, the anode conductive layer comprising a plurality of transfer connection electrodes, the touch lead layer comprising a plurality of touch leads, the cathode conductive layer comprising a plurality of cathodes arranged in an array; the plurality of cathodes being multiplexed into a plurality of touch electrodes, the plurality of touch electrodes being electrically connected to the plurality of touch leads through the plurality of transfer connection electrodes, at least some of the touch leads being located in a display area of ​​the touch display substrate and extending to a binding area located on one side of the display area; the method comprising: Different second power supply voltages are provided to the touch control leads electrically connected to the cathodes of different rows.

21. The method for driving a touch display substrate according to claim 20, wherein: The method of providing different second power supply voltages to the touch control leads electrically connected to the cathodes of different rows comprises: The absolute values ​​of the second power supply voltages provided by the plurality of touch leads to the plurality of rows of cathodes arranged sequentially in the direction from the binding area to the display area are increased sequentially.

22. The method for driving a touch display substrate according to claim 21, wherein: A cathode is electrically connected to a plurality of touch leads through a plurality of transfer connection electrodes; The second power supply voltage provided to multiple touch leads electrically connected to the same cathode is the same; or, the absolute value of the second power supply voltage provided to multiple touch leads electrically connected to the same cathode in sequence from the binding area to the display area increases in sequence.

23. The method for driving a touch display substrate according to any one of claims 20 to 22, further comprising: Receiving a touch sensing signal from a touch lead; A touch driving signal is provided to the corresponding touch lead according to the touch sensing signal.

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