Touch display panel, driving method thereof and touch display device

Abstract

Provided are a touch display panel and a driving method thereof, and a touch display device, and belong to the technical field of display. The touch display panel comprises a touch electrode and a charge compensation circuit on one side of a substrate. The touch electrode is coupled with a driving chip through a plurality of transmission lines to receive display signals and touch signals. The charge compensation circuit is coupled with a switch control line, a charge compensation line and the touch electrode, and is used to control the on-off of the coupled touch electrode and the charge compensation line under the control of a switch control signal provided by the switch control line, so that the charge compensation line transmits a charge compensation signal to the touch electrode. In this way, the switch control signal and the charge compensation signal can be flexibly set to reliably compensate the touch signal received by the touch electrode, ensure the collection accuracy of the touch sensing signal, and further ensure the touch sensing accuracy.

Description

TECHNICAL FIELD

[0001] The present disclosure shows the technical field, and particularly relates to a touch display panel and a driving method thereof, and a touch display device. BACKGROUND

[0002] With the progress of display technology, touch display products integrating touch and display emerge as the times require, which can display pictures and realize touch sensing, providing a simple and convenient human-computer interaction mode for people.

[0003] In the related art, a touch display product generally includes a touch display panel and a touch and display driver integration (TDDI) chip. The touch display panel includes a plurality of touch electrodes. The TDDI chip is coupled to the plurality of touch electrodes through a plurality of transmission lines and is configured to transmit a driving voltage to the plurality of touch electrodes. In a display phase, the TDDI chip generally transmits a display signal to the touch electrodes to realize a display function. In a touch phase, the TDDI chip generally transmits a touch signal to the touch electrodes, so that the touch electrodes feed back a touch sensing signal to the TDDI to realize a touch function. The display signal generally has a negative potential, and the touch signal generally has a positive potential.

[0004] However, due to the parasitic capacitance existing in the touch display panel, the potential on the touch electrode cannot be quickly and reliably converted from the negative potential to the required positive potential in the initial stage of switching from the display phase to the touch phase. As a result, the collection accuracy of the touch sensing signal is poor, which further affects the touch sensing accuracy. SUMMARY

[0005] A touch display panel and a driving method thereof, and a touch display device are provided, which can solve the problem of low touch sensing accuracy in the related art. The technical solution is as follows:

[0006] In one aspect, a touch display panel is provided, which includes:

[0007] a substrate;

[0008] a plurality of touch electrodes located on one side of the substrate, the plurality of touch electrodes being configured to be coupled to a driving chip through a plurality of transmission lines and to receive a display signal provided by the driving chip in a display phase and a touch signal provided by the driving chip in a touch phase, the potential of the touch signal being different from the potential of the display signal;

[0009] at least one charge compensation circuit located at one side of the substrate, each charge compensation circuit being coupled with a switch control line, a charge compensation line and at least one touch electrode respectively, and configured to control the at least one touch electrode to be connected or disconnected with the charge compensation line in response to a switch control signal provided by the switch control line;

[0010] wherein the switch control line and the charge compensation line are configured to be coupled with the driving chip, and configured to receive a switch control signal and a charge compensation signal provided by the driving chip.

[0011] Optionally, each charge compensation circuit comprises a switch sub-circuit and a potential adjusting sub-circuit.

[0012] the switch sub-circuit is coupled with the switch control line, the at least one touch electrode and a first end of the potential adjusting sub-circuit respectively, and configured to control the at least one touch electrode to be connected or disconnected with the first end of the potential adjusting sub-circuit based on the switch control signal;

[0013] a second end of the potential adjusting sub-circuit is coupled with the charge compensation line, and configured to adjust a potential of the first end of the potential adjusting sub-circuit based on a charge compensation signal provided by the charge compensation line.

[0014] Optionally, the switch sub-circuit comprises a switch transistor, and the potential adjusting sub-circuit comprises a storage capacitor.

[0015] a gate of the switch transistor is coupled with the switch control line, a first pole of the switch transistor is coupled with a first pole plate of the storage capacitor, a second pole of the switch transistor is coupled with the at least one touch electrode, and a second pole plate of the storage capacitor is coupled with the charge compensation line.

[0016] Optionally, the storage capacitor comprises a first electrode and a second electrode which are located at one side of the substrate and stacked in a first direction in sequence.

[0017] the switch transistor comprises a gate metal layer and a source-drain metal layer which are located at one side of the substrate and stacked in the first direction in sequence, the source-drain metal layer comprises a source metal layer and a drain metal layer which are arranged in a second direction in sequence, and the second direction intersects the first direction;

[0018] further, the gate metal layer serves as a gate of the switch transistor, one of the source metal layer and the drain metal layer serves as a first pole of the switch transistor, and the other one serves as a second pole of the switch transistor, the first electrode serves as a second pole plate of the storage capacitor, and the second electrode serves as a first pole plate of the storage capacitor.

[0019] Optionally, a projection of the second electrode on the substrate covers a projection of the first electrode on the substrate.

[0020] Optionally, the first electrode and the source-drain metal layer are in the same layer, and the second electrode and the touch electrode are in the same layer.

[0021] Further, the touch display panel further comprises an insulating layer between the source-drain metal layer and the second electrode; the second electrode and the touch electrode are coupled to the source-drain metal layer through a via penetrating the insulating layer.

[0022] Optionally, the material of the first electrode comprises a metal conductive material; the material of the second electrode and the material of the touch electrode comprise a transparent conductive material.

[0023] Optionally, each charge compensation circuit is coupled to a plurality of touch electrodes.

[0024] Further, each charge compensation circuit comprises a plurality of switch sub-circuits corresponding to the plurality of touch electrodes coupled thereto, and a potential adjusting sub-circuit corresponding to the plurality of touch electrodes coupled thereto.

[0025] Optionally, the plurality of touch electrodes are arranged in an array, and each charge compensation circuit is coupled to at least one touch electrode in the same column.

[0026] Optionally, the touch display panel comprises a plurality of charge compensation circuits coupled to touch electrodes in the same column.

[0027] Further, in the plurality of charge compensation circuits, each charge compensation circuit is coupled to a different touch electrode, a different charge compensation line, and a different switch control line.

[0028] Optionally, the touch display panel comprises at least two charge compensation circuits coupled to a first column of touch electrodes and a last column of touch electrodes, respectively.

[0029] Optionally, the touch display panel further comprises a peripheral circuit on a side of the first column of touch electrodes and a side of the last column of touch electrodes, respectively.

[0030] The charge compensation circuit coupled to the first column of touch electrodes is between the peripheral circuit on the side of the first column of touch electrodes and the first column of touch electrodes; and the charge compensation circuit coupled to the last column of touch electrodes is between the peripheral circuit on the side of the last column of touch electrodes and the last column of touch electrodes.

[0031] In another aspect, a driving method of a touch display panel is provided, which is applied to the touch display panel as described in the above aspect; the method comprises:

[0032] The display signals are provided to the plurality of touch electrodes through the plurality of transmission lines to drive the touch display panel to display a picture and realize a display function.

[0033] In response to a touch enable signal, a charge compensation signal is provided to the charge compensation line, and a switch control signal of an effective potential is provided to the switch control line, and the charge compensation circuit controls the coupled touch electrode to be conductive with the charge compensation line in response to the switch control signal of the effective potential.

[0034] In response to a sensing enable signal, the touch signal is provided to the plurality of touch electrodes through the plurality of transmission lines to drive the plurality of touch electrodes to feedback a touch sensing signal and realize a touch sensing function.

[0035] The potential of the touch signal is different from the potential of the display signal.

[0036] Optionally, the method further includes:

[0037] When the display signals are provided to the plurality of touch electrodes through the plurality of transmission lines, a switch control signal of an ineffective potential is provided to the switch control line, and the charge compensation circuit controls the coupled touch electrode to be decoupled from the charge compensation line in response to the switch control signal of the ineffective potential.

[0038] In another aspect, a touch display device is provided, which includes a driving chip and the touch display panel as described in the above aspect.

[0039] The driving chip is coupled with the touch display panel and is configured to drive the touch display panel to realize a display function and a touch sensing function.

[0040] In summary, the technical solutions provided by the embodiments of the present disclosure have at least the following beneficial effects:

[0041] Provided are a touch display panel and a driving method therefor, and a touch display device. The touch display panel includes a substrate, and a plurality of touch electrodes and a charge compensation circuit on one side of the substrate. The plurality of touch electrodes are coupled to a driving chip through a plurality of transmission lines to receive display signals and touch signals. The charge compensation circuit is coupled to a switch control line, a charge compensation line, and at least one touch electrode, and is configured to control the on-off of the coupled touch electrode and the charge compensation line under the control of a switch control signal provided by the switch control line, so that the charge compensation line transmits a charge compensation signal to the touch electrode. In this way, the switch control signal and the charge compensation signal can be flexibly set to reliably compensate for the touch signals received by the touch electrode, avoid the influence of parasitic capacitance on the potential of the touch signals, and enable the potential on the touch electrode to be quickly and reliably converted from a negative potential to a required positive potential when switching from a display phase to a touch phase. Furthermore, the collection accuracy of the touch sensing signal can be ensured to be good, and the touch sensing accuracy can be ensured to be good. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0043] Figure 1 is a structural schematic diagram of a touch display panel in the related art;

[0044] Figure 2 is a touch signal simulation schematic diagram of a large-load touch display panel in the related art;

[0045] Figure 3 is a touch signal comparison diagram of a small-load and large-load touch display panel in the related art;

[0046] Figure 4 is a timing diagram of various signals in a touch display panel in the related art;

[0047] Figure 5 is a structural schematic diagram of a touch display panel provided by an embodiment of the present application;

[0048] Figure 6 is a partial structural schematic diagram of a touch display panel provided by an embodiment of the present application;

[0049] Figure 7 is a structural block diagram of a charge compensation circuit provided by an embodiment of the present application;

[0050] Figure 8is a circuit structure schematic diagram of a charge compensation circuit provided by an embodiment of the present disclosure.

[0051] Figure 9 is a film layer top view schematic diagram of a charge compensation circuit provided by an embodiment of the present disclosure.

[0052] Figure 10 is a film layer cross-sectional schematic diagram of a charge compensation circuit provided by an embodiment of the present disclosure.

[0053] Figure 11 is a flow chart of a driving method of a touch display panel provided by an embodiment of the present disclosure.

[0054] Figure 12 is a structure schematic diagram of a touch display device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings.

[0056] In the field of display technology, especially in the field of liquid crystal display (LCD), the touch display panel included in the touch display product is mainly self-capacitive in-cell panel. The in-cell panel refers to the integration of the touch panel and the display panel, that is, the touch function is embedded into the liquid crystal pixel. The integrated circuit (IC) matched with the in-cell panel, also known as the driving chip (IC), is the TDDI described in the above background art. The TDDI is coupled (i.e., electrically connected) with the in-cell panel, and is used to control the in-cell panel to realize the display function and the touch function.

[0057] In addition, with the increasing demand for high resolution, high aperture ratio and narrow frame, etc., the wiring in the touch display product is also increasingly dense, and the driving chip IC also has a design trend of low power consumption and small area. Among them, the dense wiring will inevitably produce greater parasitic capacitance and wiring resistance. If the driving chip IC is expected to drive a large load touch display panel, the driving capability of the driving chip IC needs to be increased, which requires a larger area to design the circuit to generate strong driving capability.

[0058] Figure 1 A structure schematic diagram of a touch display product in the related art is shown. As shown in FIG. 1, the touch display product includes a touch display panel 10 and a driving chip IC 20. The driving chip IC 20 is coupled (i.e., electrically connected) with the touch display panel 10, and is used to control the touch display panel 10 to realize the display function and the touch function. Figure 1As shown, the current touch display product generally includes: a driving chip IC and a plurality of touch sensors (TS). The driving chip IC is coupled with the plurality of touch sensors TS through a plurality of transmission lines Tx. As shown Figure 1 As shown, the plurality of touch sensors TS are arranged in an array, and the driving chip IC can be coupled with the plurality of touch sensors TS one by one through the plurality of transmission lines Tx. In addition, in some embodiments, the plurality of touch sensors TS can also be divided into groups by column, and each group can be coupled with the driving chip IC through a multiplexing unit MUX. That is, each group of touch sensors TS can be coupled with the same multiplexing unit MUX through a plurality of transmission lines Tx, and the multiplexing unit MUX is coupled with the driving chip IC through a wire. The multiplexing unit MUX can control the on-off between the plurality of touch sensors TS and the driving chip IC based on the received switch signal, so as to reduce the interface required to be set on the driving chip IC and reduce the area of the driving chip IC.

[0059] In combination Figure 1 , for the current touch display panel, each frame needs to be divided into a display phase and a touch phase, and the common electrode in the display phase and the sensor electrode in the touch phase are shared, which is the touch sensor TS described in the above embodiments. In addition, the touch display panel can also include a pixel electrode. In the display phase, the driving chip IC can provide a negative potential display signal to the touch sensor TS, and the display signal forms a potential difference with the driving signal received by the pixel electrode, so as to drive the liquid crystal molecules to deflect, so that the touch display panel displays a picture. In the touch phase, the driving chip IC can provide a positive potential touch signal to the touch sensor TS, so that the touch sensor TS feeds back a touch sensing signal for the driving chip IC to detect the touch position. For example, the touch sensing signal can generally be fed back to the signal collection unit in the driving chip IC, also known as the analog front-end (AFE). As can be seen, when the display phase is switched to the touch phase, the driving chip IC needs to switch the negative potential on the touch sensor TS to a positive potential.

[0060] On the one hand: for large-load touch display panels, referring to Figure 2 As can be seen from the simulation results of the internal amplifier module output of the driving chip IC shown, due to the influence of parasitic capacitance and resistance, a long settling time is required for the potential switching process, which in turn can cause inaccurate touch sensing signal collection when switching to the touch phase, resulting in invalid touch sensing signal and affecting touch sensing accuracy.

[0061] On the other hand: referring to Figure 3It can be seen from the shown touch signal establishment time contrast simulation diagram that, compared with the small-load touch display panel, the large-load touch display panel has a time length of about 300-400 microseconds (μs) for the AFE to process the touch sensing signal each time under the same 120 hertz (Hz) refresh rate requirement, but for the large-load touch display panel, it takes 70 μs to establish a stable state when switching to the touch phase, which is much longer than the setting time of 7 μs for the small-load touch display panel to establish a stable state. Figure 3 In the figure, Display_EN refers to a display enable signal, and the valid potential indicates entering the display phase, and the invalid potential indicates ending the display phase. TMUX_EN refers to an enable signal of a multiplexing unit, and the valid potential indicates entering the working state, and the invalid potential indicates not entering the working state. TX_EN refers to a signal transmission enable signal, and the valid potential indicates providing a signal to the transmission line Tx, and the invalid potential indicates stopping providing the signal to the transmission line Tx. VEX refers to a touch signal transmitted to the touch electrode TS through the transmission line Tx, and the valid potential indicates that the touch electrode TS feeds back a touch sensing signal (generally a square wave signal), and the invalid potential indicates that the touch electrode TS stops feeding back the touch sensing signal. The abscissa refers to time, and the unit is μs; the ordinate refers to potential, and the unit is volt (V). Optionally, the valid potential can be higher than the invalid potential, or, in some other embodiments, the valid potential can also be lower than the invalid potential. Figure 3 The shown high potential, or, in some other embodiments, the valid potential can also be lower than the invalid potential.

[0062] In another aspect, referring to Figure 4 It can be seen from the shown signal timing diagram of the related art that, after the touch enable signal TP_EN is turned on (i.e., the valid potential), the touch electrode TS can receive the touch signal VEX provided by the driving chip IC. Here, the touch enable signal TP_EN refers to a signal for indicating whether to enter the touch phase, wherein the valid potential of the touch enable signal TP_EN indicates entering the touch phase, and the invalid potential of the touch enable signal TP_EN indicates ending the touch phase. Moreover, before the sensing enable signal VEX_EN is turned on, the touch signal VEX can be grounded, i.e., the potential can be 0. Here, the sensing enable signal VEX_EN refers to a signal for indicating whether to receive the touch signal VEX, wherein the valid potential of the sensing enable signal VEX_EN indicates starting to receive the touch signal VEX, and the invalid potential of the sensing enable signal VEX_EN indicates stopping to receive the touch signal VEX. During the time period t1 from when the touch enable signal TP_EN jumps to the valid potential to when the sensing enable signal VEX_EN jumps to the valid potential, the potential (i.e., the sensor voltage Vsensor) on the touch electrode TS can first change from the negative potential (e.g., -2 V) of the display signal received in the display phase to 0 through natural discharge, but due to the influence of the parasitic capacitance and resistance, the change is relatively slow, Figure 4The potential Vcom received when the touch electrode TS is used as a common electrode is also shown schematically. The potential Vcom is provided by the driving chip IC via the transmission line TX. Figure 4 It can be seen that after the sensing enable signal VEX_EN is turned on, the touch signal VEX starts to become a modulated square wave signal, generally 1V to 4V. If the potential on the touch electrode TS does not quickly reach the low potential 1V of the square wave signal after the square wave signal starts, but a lower value (e.g. 0.5V), the final high potential on the touch electrode TS can only reach about 3.5V. This will cause errors to be introduced during touch sensing, affecting the touch sensing accuracy. This error will gradually decrease as the touch signal VEX progresses, until the potential on the touch electrode TS becomes the potential of the square wave signal of 1V to 4V. During this period, the touch signal is inaccurate.

[0063] Based on this, the embodiments of the present disclosure provide a new touch display panel, which can realize fast conversion from the display stage to the touch stage, ensure good touch accuracy, and has high efficiency.

[0064] Figure 5 is a structural schematic diagram of a touch display panel provided by the embodiments of the present disclosure. As shown in Figure 5 The touch display panel includes a substrate 01 and a plurality of touch electrodes TS located on one side of the substrate 01.

[0065] The plurality of touch electrodes TS are coupled to the driving chip IC via a plurality of transmission lines Tx. Figure 5 The plurality of touch electrodes TS are also arranged in an array as shown in Figure 1 The driving chip IC is coupled to the plurality of touch electrodes TS one by one via the plurality of transmission lines Tx. That is, the driving chip IC is coupled to one touch electrode TS via one transmission line TX, and is coupled to different touch electrodes TS via different transmission lines TX.

[0066] In addition, the plurality of touch electrodes TS are configured to receive a display signal provided by the driving chip IC in the display stage and a touch signal provided by the driving chip IC in the touch stage, and the potential of the touch signal is different from the potential of the display signal. For example, as described in the above embodiments, the potential of the touch signal can be a positive potential, and the potential of the display signal can be a negative potential, that is, the potential of the touch signal can be greater than the potential of the display signal. In addition, the display signal is generally a direct current signal, and the touch signal is generally a square wave signal. The display signal can be used to indicate that the touch electrode TS and the pixel electrode receive a driving signal to form a potential difference to drive the liquid crystal molecules in the touch display panel to deflect, so that the touch display panel displays a picture. The touch signal can be used to indicate that the touch electrode TS feeds back a touch sensing signal to the AFE in the driving chip IC, so that the touch display panel realizes touch sensing.

[0067] In addition, compared with Figure 1, continue to refer to Figure 5 It can be seen that the touch display panel disclosed in the embodiments of the present disclosure comprises at least one charge compensation circuit 02 on one side of the substrate 01 in addition to the touch electrode TS.

[0068] Each charge compensation circuit 02 is coupled with the switch control line Vg, the charge compensation line Vm and at least one touch electrode TS, and is configured to control the on-off of the at least one touch electrode TS and the charge compensation line Vm in response to the switch control signal provided by the switch control line Vg.

[0069] For example, each charge compensation circuit 02 can control the coupled touch electrode TS to be conductive with the charge compensation line Vm when the potential of the switch control signal provided by the switch control line Vg is the effective potential, so that the charge compensation line Vm transmits the charge compensation signal to the touch electrode TS. In addition, each charge compensation circuit 02 can control the coupled touch electrode TS to be decoupled from the charge compensation line Vm when the potential of the switch control signal provided by the switch control line Vg is the ineffective potential.

[0070] In this way, the on-off state of the touch electrode TS and the charge compensation line Vm can be controlled by flexibly setting the switch control signal, and the charge compensation signal can be flexibly set, so that when switching from the display phase to the touch phase, the potential on the touch electrode TS can quickly rise from the negative potential to the required positive potential and remain stable, thereby quickly entering the touch phase and improving the touch sensing accuracy.

[0071] For example, in combination with Figure 4 When switching from the display phase to the touch phase, the switch control line Vg can be controlled to provide the switch control signal with the effective potential after the touch enable signal TP EN is turned on and before the touch signal VEX is transmitted through the transmission line TX (i.e., at phase t1), so that the touch electrode TS is conductive with the charge compensation line Vm, and the charge compensation line Vm transmits the charge compensation signal to the touch electrode TS to pre-raise the potential on the touch electrode TS to a certain potential. After the square wave signal (i.e., the touch signal VEX) arrives, even in the presence of parasitic capacitance and resistance, the potential on the touch electrode TS can reliably reach the required potential compared to related art, such as 1V as shown in Figure 4 .

[0072] It should be noted that the switch control line Vg and the charge compensation line Vm can also be coupled with the driving chip IC and used to receive the switch control signal and the charge compensation signal provided by the driving chip IC. That is, the driving chip IC can provide the required signals to the switch control line Vg and the charge compensation line Vm.

[0073] In summary, this disclosure provides a touch display panel. The touch display panel includes a substrate, and multiple touch electrodes and a charge compensation circuit located on one side of the substrate. The multiple touch electrodes are coupled to a driver chip via multiple transmission lines to receive display signals and touch signals. The charge compensation circuit is coupled to a switch control line, a charge compensation line, and at least one touch electrode, and controls the switching on / off state of the coupled touch electrodes and the charge compensation line under the control of a switch control signal provided by the switch control line, so that the charge compensation line transmits a charge compensation signal to the touch electrodes. Thus, by flexibly setting the switch control signal and the charge compensation signal, reliable compensation of the touch signals received by the touch electrodes can be achieved, avoiding the influence of parasitic capacitance on the potential of the touch signals. This allows the potential on the touch electrodes to quickly and reliably transition from a negative potential to the required positive potential when switching from the display stage to the touch stage. Furthermore, this ensures better acquisition accuracy of the touch sensing signal and better touch sensing accuracy.

[0074] Optional, such as Figure 5 As shown, in the touch display panel provided in this embodiment, a plurality of touch electrodes TS can be arranged in an array (i.e., including multiple rows and columns of touch electrodes TS). Each charge compensation circuit 02 can be coupled to at least one touch electrode TS located in the same column.

[0075] Example, combination Figure 5 The touch display panel shown includes at least two charge compensation circuits 02, respectively coupled to the first row of touch electrodes TS and the last row of touch electrodes TS. Furthermore, Figure 5 Two charge compensation circuits 02, respectively coupled to the first and last row touch electrodes TS, are shown only schematically.

[0076] It should be noted that, as described in the above embodiments, the touch electrodes TS can be divided into multiple groups according to columns, and coupled one-to-one to the driver chip IC through multiple multiplexing units (MUX). The on / off state of each group of touch electrodes TS and the driver chip IC can be controlled by the corresponding MUX. Furthermore, each MUX can sequentially provide effective potential switching signals to control the sequential conduction of each coupled group of touch electrodes TS and the driver chip IC. For example, combined with... Figure 4 The timing diagram shown illustrates the timing of the switching signals provided by four multiplexing units (MUX), labeled TMUX1, TMUX2, TMUX3, and TMUX4. TMUX1, TMUX2, TMUX3, and TMUX4 can be configured according to... Figure 4 The timing sequence shown represents the effective potentials, causing each set of coupled touch electrodes TS to sequentially connect to the driver chip IC and receive the touch signals provided by the driver chip IC. Furthermore, from... Figure 4It can also be seen that the potential on the touch electrode TS switches from negative to positive when the first multiplexing unit MUX provides a switching signal with an effective potential, controlling the touch electrode TS to conduct with the driver chip IC. Subsequent switching signals from each multiplexing unit MUX have sufficient time to stabilize compared to the first multiplexing unit MUX. Therefore, it is advisable to consider coupling the charge compensation circuit 02 to the touch electrode TS coupled to the first multiplexing unit MUX.

[0077] Furthermore, it should be noted that the touch electrodes TS coupled to the first multiplexing unit MUX are often located on the left and right sides of the touch display panel, that is, including the first row of touch electrodes TS and the last row of touch electrodes TS. Therefore, combined with Figure 5 As can be seen from the embodiments disclosed herein, a charge compensation circuit 02 can be arranged on the left and right sides of the touch display panel, respectively, to be coupled to the first column of touch electrodes TS and the last column of touch electrodes TS. This reduces wiring, saves costs, and facilitates high-resolution and narrow-bezel designs, while accelerating the potential transition on the left and right touch electrodes TS, achieving a fast and reliable transition to the touch stage and improving touch sensing accuracy. Of course, in some other embodiments, a charge compensation circuit 02 can also be provided on one side of each column of touch electrodes TS to couple to each column of touch electrodes TS, achieving reliable charge compensation.

[0078] Optional, with Figure 5 Taking the left side partial structure of the touch display panel shown as an example, Figure 6 A schematic diagram of a local charge compensation circuit is shown. (Reference) Figure 6 As can be seen, the touch display panel provided in this embodiment may include: multiple charge compensation circuits 02 coupled to the same column of touch electrodes TS.

[0079] For example, Figure 6 Two charge compensation circuits 02 coupled to the same column of touch electrodes TS are schematically shown. Furthermore, each of the multiple charge compensation circuits 02 can be coupled to different touch electrodes TS, different charge compensation lines Vm, and different switch control lines Vg. In this way, by flexibly providing the required switch control signals and charge compensation signals to different charge compensation circuits 02, targeted charge compensation for different rows of touch electrodes TS within a column of touch electrodes TS can be achieved, resulting in greater compensation flexibility.

[0080] For example, for the charge compensation signal, the longer the transmission line TX, the greater the parasitic capacitance, and the greater the potential that needs to be compensated. Therefore, different charge compensation circuits 02 can be used to provide charge compensation signals with different potentials to the front rows of touch electrodes TS away from the driving chip IC and to the rear rows of touch electrodes TS close to the driving chip IC, so as to achieve flexible charge compensation of the touch electrodes TS based on their proximity to the driving chip IC. Similarly, for the switch control signal, the charge compensation circuit 02 coupled to the touch electrode TS that needs to be compensated can be provided with an effective potential switch control signal to enable the touch electrode TS to be coupled to the charge compensation line Vm, and the charge compensation circuit 02 coupled to the touch electrode TS that does not need to be compensated can be provided with an ineffective potential switch control signal to disable the touch electrode TS from being coupled to the charge compensation line Vm.

[0081] That is, in the embodiments of the present disclosure, the driving chip IC can be used to provide different charge compensation signals to different charge compensation circuits 02 to achieve flexible adjustment of the size of charge compensation in different regions, and the driving chip IC can also be used to provide different switch control signals to different charge compensation circuits 02 to achieve flexible control of whether to perform charge compensation in different regions. Of course, in some other embodiments, if flexible control of whether to perform charge compensation in different regions is not required, multiple charge compensation circuits 02 coupled to the same column of touch electrodes TS can also be coupled to the same switch control line Vg. The coupling of the charge compensation line Vm is the same.

[0082] Optionally, referring to Figure 1 、 Figure 5 and Figure 6 It can also be seen that the touch display panel described in the embodiments of the present disclosure can further include a peripheral circuit 03 located on one side of the first column of touch electrodes TS and the last column of touch electrodes TS, and the driving chip IC can be coupled to the peripheral circuit 03 and used to transmit a driving signal to the peripheral circuit 03 to control the operation of the peripheral circuit 03. For example, the peripheral circuit 03 here can be a gate driver on array (GOA) circuit coupled to the pixels in the touch display panel. The GOA circuit can be coupled to the pixel circuit in the pixel and used to transmit a gate driving signal to the pixel circuit to enable the pixel circuit to transmit a data signal to the coupled pixel electrode to charge the pixel electrode.

[0083] On this basis, further combined with Figure 5 and Figure 6It can be seen that the charge compensation circuit 02 coupled with the first column of touch electrodes TS is located between the peripheral circuit on one side of the first column of touch electrodes TS and the first column of touch electrodes TS. The charge compensation circuit 02 coupled with the last column of touch electrodes TS is located between the peripheral circuit on one side of the last column of touch electrodes TS and the last column of touch electrodes TS. In this way, wiring can be facilitated.

[0084] Optionally, Figure 7 A structural schematic diagram of a charge compensation circuit is shown. As Figure 7 shown, each charge compensation circuit 02 provided by the embodiments of the present disclosure includes: a switching sub-circuit 021 and a potential adjusting sub-circuit 022.

[0085] The switching sub-circuit 021 can be coupled with the switching control line Vg, at least one touch electrode TS, and the first end of the potential adjusting sub-circuit 022, respectively. The switching sub-circuit 021 can be used to control the on-off of at least one touch electrode TS and the first end of the potential adjusting sub-circuit 022 based on the switching control signal.

[0086] For example, the switching sub-circuit 021 can control at least one touch electrode TS to be conductive with the first end of the potential adjusting sub-circuit 022 when the potential of the switching control signal is an effective potential; and the switching sub-circuit 021 can control at least one touch electrode TS to be decoupled from the first end of the potential adjusting sub-circuit 022 when the potential of the switching control signal is an ineffective potential.

[0087] The second end of the potential adjusting sub-circuit 022 can be coupled with the charge compensation line Vm. The potential adjusting sub-circuit 022 can be used to adjust the potential of the first end of the potential adjusting sub-circuit 022 based on the charge compensation signal provided by the charge compensation line Vm.

[0088] Optionally, on the basis of Figure 7 reference Figure 8 The circuit diagram shown can be seen that the switching sub-circuit 021 can include: a switching transistor T1. The potential adjusting sub-circuit 022 can include: a storage capacitor C1.

[0089] The gate of the switching transistor T1 can be coupled with the switching control line Vg, the first pole of the switching transistor T1 can be coupled with the first pole plate of the storage capacitor C1, the second pole of the switching transistor T1 can be coupled with at least one touch electrode TS, and the second pole plate of the storage capacitor C1 can be coupled with the charge compensation line Vm. Optionally, one of the first pole and the second pole of the switching transistor T1 can be a source, and the other can be a drain.

[0090] Optionally, in the scenario where each charge compensation circuit 02 is coupled with a plurality of touch electrodes TS, in combination with Figure 6As can be seen, each charge compensation circuit 02 can include a plurality of switch sub-circuits 021 (i.e., switch transistors T1) corresponding to the plurality of touch electrodes TS coupled one by one, and one potential adjustment sub-circuit 022 (i.e., storage capacitor C1) corresponding to the plurality of touch electrodes TS coupled. That is, one charge compensation circuit 02 coupled with the plurality of touch electrodes TS can share one storage capacitor C1, and can be coupled with the corresponding touch electrodes TS through different switch transistors T1 respectively, ensuring good control reliability.

[0091] Optionally, based on the structure shown in 7 and Figure 8 Figure 9 A top view of the film layer is shown, Figure 10 A cross-sectional view of the film layer is shown. Referring to Figure 9 and Figure 10 As can be seen, the storage capacitor C1 in the charge compensation circuit 02 can include a first electrode E1 and a second electrode E2 located on one side of the substrate 01 and stacked in the first direction X1. The switch transistor T1 in the charge compensation circuit 02 can include a gate metal layer GATE and a source-drain metal layer SD located on one side of the substrate 01 and stacked in the first direction X1. The source-drain metal layer SD includes a source metal layer S1 and a drain metal layer D1 arranged in the second direction X2. The second direction X2 can intersect the first direction X1. For example, referring to Figure 9 and Figure 10 The second direction X2 and the first direction X1 are perpendicular to each other.

[0092] In addition, the gate metal layer GATE can serve as the gate of the switch transistor T1. Among the source metal layer S1 and the drain metal layer D1, one metal layer can serve as the first pole of the switch transistor T1, and the other metal layer can serve as the second pole of the switch transistor T1. The first electrode E1 can serve as the second pole plate of the storage capacitor C1. The second electrode E2 can serve as the first pole plate of the storage capacitor C1.

[0093] Optionally, in combination with Figure 9 and Figure 10 As can be seen, the first electrode E1 can be located in the same layer as the source-drain metal layer SD, and the second electrode E2 can be located in the same layer as the touch electrode TS. In addition, the touch display panel can further include an insulating layer J1 located between the source-drain metal layer SD and the second electrode E2. The second electrode E2 and the touch electrode TS are coupled with the source-drain metal layer SD through the via K1 penetrating the insulating layer J1. For example, as shown in Figure 9 The second electrode E2 can be coupled with the source metal layer S1 through the via K1 penetrating the insulating layer J1, and the touch electrode TS can be coupled with the drain metal layer D1 through the via K1 penetrating the insulating layer J1.

[0094] ​It should be noted that the same layer can refer to: using the same film forming process to form a film layer for forming a specific pattern, and then using the same mask to pattern the film layer by one patterning process to form a layer structure. According to different specific patterns, the one patterning process can include multiple exposure, development or etching processes, and the specific pattern in the formed layer structure can be continuous or discontinuous. That is, the plurality of elements, components, structures and / or parts located in the "same layer" are composed of the same material and formed by the same patterning process. In this way, the manufacturing process and manufacturing cost can be saved, and the manufacturing efficiency can be improved.

[0095] Optionally, referring to Figure 10 It can also be seen that the switching transistor T1 can further include an active layer ACT between the gate metal layer GATE and the source-drain metal layer SD. In addition, Figure 10 It is also shown that the film layers included in the peripheral circuit 03 (such as GOA circuit). The area where the charge compensation circuit 02 and the peripheral circuit 03 are located can be the peripheral area BB (also referred to as the non-display area) of the substrate 01, and the area where the touch electrode TS is located can be the display area AA of the substrate 01. That is, the substrate 01 described in the embodiments of the present disclosure can have a display area AA and a peripheral area BB adjacent to the display area AA as shown. Figure 10 Accordingly, it can be known that in the embodiments of the present disclosure, the touch electrode TS includes not only the main part TS1 located in the display area AA, but also the extension part TS2 located in the peripheral area, and the extension part TS2 can be coupled to the switching transistor T1 through the via K1, so that the main part TS1 is coupled to the switching transistor T1.

[0096] Optionally, the material of the first electrode E1 can include: a metal conductive material. For example, metal aluminum Al. The material of the second electrode E2 and the material of the touch electrode TS can both include: a transparent conductive material. For example, indium tin oxide (ITO). Accordingly, the first electrode E1 can also be referred to as a metal electrode, and the second electrode E2 can also be referred to as an ITO electrode.

[0097] That is, in combination with the above embodiments, the embodiments of the present disclosure can form a storage capacitor C1 for storing charges by the oppositely arranged metal electrode and ITO electrode. In addition, the metal electrode can be coupled to the driving chip IC through the charge compensation line Vm described in the above embodiments, and the driving chip IC can provide a charge compensation signal to the metal electrode; the ITO electrode can be located directly above the metal electrode and can be coupled to the source of the switching transistor T1 through the via K1; and the drain of the switching transistor T1 can be coupled to a part of the touch electrode TS extending out through the via K1, and the gate of the switching transistor T1 can be coupled to the driving chip IC through the switching control line Vg described in the above embodiments, and the driving chip IC can provide a switching control signal to the gate of the switching transistor T1.

[0098] It should be noted that, since the capacitance of the storage capacitor C1 is proportional to the overlapping area S of the two included plates and inversely proportional to the distance d between the two included plates, it can be known that, in the embodiment of the present disclosure, the amount of charge that can be stored by the storage capacitor C1 can be changed by adjusting the overlapping area S or the distance d of the metal electrode and the ITO electrode, so as to realize flexible compensation of the potential on the touch electrode TS. For example, referring to FIG. 2, the overlapping area S of the metal electrode and the ITO electrode is adjusted to be larger, so as to increase the amount of charge that can be stored by the storage capacitor C1, and further ensure reliable compensation of the potential on the touch electrode TS. Figure 9 In the embodiment of the present disclosure, the orthographic projection of the second electrode E2 (i.e., the ITO electrode) on the substrate 01 can cover the orthographic projection of the first electrode E1 (i.e., the metal electrode) on the substrate 01, so as to ensure that the amount of charge that can be stored by the storage capacitor C1 is larger, and further ensure reliable compensation of the potential on the touch electrode TS.

[0099] It should be noted that the switch transistor recorded in the embodiment of the present disclosure can be a thin film transistor or a field effect transistor or other devices with the same characteristics. The transistor used in the embodiment of the present disclosure is mainly a switch transistor according to the role in the circuit. Since the source and the drain of the switch transistor used here are symmetrical, the source and the drain can be interchangeable. In the embodiment of the present disclosure, the source is referred to as the first pole, and the drain is referred to as the second pole. According to the mode in the drawing, the middle end of the transistor is defined as the control pole, which can also be referred to as the gate, the signal input end is referred to as the source, and the signal output end is referred to as the drain. In addition, the switch transistor used in the embodiment of the present disclosure can include any one of a P-type switch transistor and an N-type switch transistor. Among them, the P-type switch transistor is turned on when the gate is at a low level, and is turned off when the gate is at a high level (i.e., for the P-type transistor, the potential of the signal received by the gate is low when it is turned on, and the potential of the signal received by the gate is high when it is turned off, i.e., the low potential is the effective potential, and the high potential is the invalid potential), and the N-type switch transistor is turned on when the gate is at a high level, and is turned off when the gate is at a low level (i.e., for the N-type transistor, the potential of the signal received by the gate is high when it is turned on, and the potential of the signal received by the gate is low when it is turned off, i.e., the high potential is the effective potential, and the low potential is the invalid potential).

[0100] It can be known from the above description that, by setting the charge compensation circuit, the embodiment of the present disclosure compensates the potential on the touch electrode TS, speeds up the conversion of the potential on the touch electrode TS from the display stage to the touch stage, solves the problem that the current touch display panel needs a longer stable time when converting from the display stage to the touch stage, and causes the effective time of the touch stage to be shortened, and ensures that the touch sensing accuracy and efficiency are good.

[0101] In summary, the embodiment of the present disclosure provides a touch display panel. The touch display panel comprises a substrate, and a plurality of touch electrodes and a charge compensation circuit located on one side of the substrate. The plurality of touch electrodes are coupled with a driving chip through a plurality of transmission lines to receive display signals and touch signals. The charge compensation circuit is coupled with a switch control line, a charge compensation line and at least one touch electrode, and is used to control the on-off of the coupled touch electrode and the charge compensation line under the control of a switch control signal provided by the switch control line, so that the charge compensation line transmits a charge compensation signal to the touch electrode. In this way, the reliable compensation of the touch signal received by the touch electrode can be realized by flexibly setting the switch control signal and the charge compensation signal, and the influence of the parasitic capacitance on the potential of the touch signal can be avoided, that is, the potential on the touch electrode can be quickly and reliably converted from a negative potential to a required positive potential when switching from a display stage to a touch stage. Further, the collection accuracy of the touch sensing signal can be ensured to be good, and the touch sensing accuracy can be ensured to be good.

[0102] Figure 11 is a flowchart of a driving method of a touch display panel provided by the embodiment of the present disclosure, which can be applied to the touch display panel shown in Figure 5 As shown in Figure 11 , the driving method comprises the following steps.

[0103] Step 1101: providing display signals to the plurality of touch electrodes through the plurality of transmission lines to drive the touch display panel to display a picture and realize a display function.

[0104] Step 1102: in response to a touch enable signal, providing a charge compensation signal to the charge compensation line and providing a switch control signal with an effective potential to the switch control line, and the charge compensation circuit controls the conduction of the coupled touch electrode and the charge compensation line in response to the switch control signal with the effective potential.

[0105] Step 1103: in response to a sensing enable signal, providing touch signals to the plurality of touch electrodes through the plurality of transmission lines to drive the plurality of touch electrodes to feedback touch sensing signals and realize a touch sensing function.

[0106] The potential of the touch signal is different from the potential of the display signal. For example, as described in the above embodiment, the potential of the display signal can be a negative potential, and the potential of the touch signal can be a positive potential, that is, the potential of the touch signal can be greater than the potential of the display signal. It should be noted that the display signal can be a direct current signal, and the touch signal can be a square wave signal.

[0107] Optionally, in some embodiments, the driving method can further include: in response to the sensing enable signal, providing an invalid potential switch control signal to the switch control line, and in response to the invalid potential switch control signal, the charge compensation circuit controls the coupled touch electrode to be decoupled from the charge compensation line.

[0108] Optionally, in some embodiments, the driving method can further include: in response to the sensing enable signal, providing an invalid potential switch control signal to the switch control line, and in response to the invalid potential switch control signal, the charge compensation circuit controls the coupled touch electrode to be decoupled from the charge compensation line.

[0109] Optionally, in some embodiments, the step 1101 can include: in response to the display enable signal, providing a display signal to the plurality of touch electrodes through the plurality of transmission lines. Correspondingly, it can be that in response to the display enable signal, an invalid potential switch control signal is provided to the switch control line.

[0110] That is, in the structure shown in Figure 5 to Figure 10 , taking the case that the valid potential is a high potential relative to the invalid potential as an example:

[0111] First, in combination with Figure 4 , when the driving chip IC receives the display enable signal Display_EN, it can be determined that the display stage is entered at this time. At this time, the driving chip IC can further provide a low potential switch control signal Vg1 to the gate of the switch transistor T1 (i.e., the gate metal layer GATE shown in Figure 10 ) through the switch control line Vg, and provide a charge compensation signal Vm1 to the first electrode E1 (i.e., the metal electrode shown in Figure 10 ) through the charge compensation line Vm. Correspondingly, the switch transistor T1 can be turned off, Figure 10The second electrode E2 (i.e. the ITO electrode) shown can be floating. On this basis, a voltage difference can exist between the ITO electrode and the metal electrode, so as to store electric charges. In addition, in the display stage, the driving chip IC can also transmit a display signal to the touch electrode TS, and the potential Vsensor of the display signal can be -2V, as described in the above embodiment. Of course, in some other embodiments, in the display stage, the driving chip IC can also provide a high potential switching control signal Vg1 to the gate of the switching transistor T1 through the switching control line Vg, so that the switching transistor T1 is turned on. Correspondingly, the display signal transmitted by the driving chip IC to the touch electrode TS is transmitted to the ITO electrode through the turned-on switching transistor T1, so that the potential Vito on the ITO electrode is the potential Vsensor of the display signal, such as -2V. On this basis, a voltage difference can also exist between the ITO electrode and the metal electrode, so as to store electric charges. Compared with turning off the switching transistor T1 and turning on the switching transistor T1, only the potential Vito on the ITO electrode is different, but both can achieve the purpose of storing electric charges.

[0112] Then, continue to combine Figure 4 In the t1 stage after the touch enable signal TP_EN is turned on, the driving chip IC can change the potential Vm1 of the provided charge compensation signal, which is generally the potential Vm1 of the charge compensation signal provided in the display stage and then boosted. Correspondingly, under the bootstrap action of the storage capacitor C1, the potential Vito on the ITO electrode can also be pulled up. At the same time, the driving chip IC can provide a high potential switching control signal Vg1 to the gate of the switching transistor T1 through the switching control line Vg, so that the switching transistor T1 is turned on. Correspondingly, the electric charges stored in the storage capacitor C1 can be transmitted to the touch electrode TS through the turned-on switching transistor T1, so that before the driving chip IC transmits the touch signal VEX, i.e. the sensing enable signal VEX_EN, to the touch electrode TS through the transmission line Tx, the potential on the touch electrode TS can quickly reach a potential close to the low potential (such as 1V) of the touch signal VEX. As can be seen, the amount of charge that can be compensated can be controlled by controlling the potential Vm1 of the charge compensation signal in the display stage and the touch stage. In addition, as described in the above embodiment, the amount of charge that can be compensated can also be controlled by adjusting the overlapping area or spacing of the metal electrode and the ITO electrode.

[0113] Finally, continue to combine Figure 4After the sensing enable signal VEX EN is turned on, the driving chip IC starts to transmit the touch signal VEX to the touch electrode TS, the driving chip IC can provide the low potential switch control signal Vg1 to the gate of the switch transistor T1 through the switch control line Vg, so that the switch transistor T1 is turned off to cut off the coupling between the storage capacitor C1 and the touch electrode TS. Then, the touch electrode TS can reliably receive the touch signal VEX provided by the driving chip IC and feed back the touch sensing signal to the driving chip IC to achieve accurate and fast touch sensing.

[0114] In summary, the embodiment of the present disclosure provides a driving method of a touch display panel. In the method, in response to a touch enable signal, a charge compensation signal can be provided to a charge compensation line, and a switch control signal with an effective potential can be provided to a switch control line, so that the charge compensation circuit controls the coupling of the touch electrode and the charge compensation line to be conductive in response to the switch control signal with the effective potential, and then the charge compensation line transmits the charge compensation signal to the touch electrode. In this way, by flexibly setting the switch control signal and the charge compensation signal, reliable compensation of the touch signal received by the touch electrode can be achieved, and the influence of the parasitic capacitance on the potential of the touch signal can be avoided, that is, the potential on the touch electrode can be quickly and reliably converted from a negative potential to a required positive potential when switching from a display stage to a touch stage. In turn, the collection accuracy of the touch sensing signal can be ensured to be good, and the touch sensing accuracy can be ensured to be good.

[0115] Figure 12 is a structural schematic diagram of a touch display device according to an embodiment of the present disclosure. As shown in Figure 12 , the touch display device includes a driving chip IC and a touch display panel 00 as shown in Figure 5 .

[0116] The driving chip IC is coupled to the touch display panel 00 and is used to drive the touch display panel 00 to realize display function and touch sensing function. That is, the driving method shown in the above Figure 11 can be executed by the driving chip IC.

[0117] For example, in the display stage, the driving chip IC can transmit a display signal to the touch electrode TS in the touch display panel 00 to make the touch display panel 00 display a picture; and in the touch stage, the driving chip IC can transmit a touch signal to the touch electrode TS in the touch display panel 00 to make the touch display panel 00 realize touch sensing function. In addition, the driving chip IC provided by the embodiment of the present disclosure can also transmit a switch control signal and a charge compensation signal to the charge compensation circuit 02 included in the touch display panel 00 to realize compensation of the touch signal, ensure high touch sensing efficiency and good accuracy.

[0118] Optionally, in some embodiments, the driving chip IC can also be integrated in the touch display panel 00, and belongs to a part of the touch display panel 00.

[0119] Optionally, the touch display device according to the embodiments of the present disclosure can be any product or component with display function, such as a mobile phone, a tablet computer, a flexible display device, a television, and a display.

[0120] It should be noted that the terms used in the embodiments of the present disclosure are used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs.

[0121] As in the embodiments of the present disclosure, the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance. The term "a plurality of" means two or more, unless otherwise explicitly defined.

[0122] Similarly, "one" or "an" and the like do not represent a quantity limitation, but mean at least one.

[0123] The terms "include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects.

[0124] "Up", "down", "left" or "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0125] The above only describes optional embodiments of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A touch display panel, characterized in that, The touch display panel comprises: a substrate; a plurality of touch electrodes located on one side of the substrate, the plurality of touch electrodes being configured to be coupled with a driving chip through a plurality of transmission lines, and configured to receive a display signal provided by the driving chip in a display stage and a touch signal provided by the driving chip in a touch stage, and a potential of the touch signal being different from a potential of the display signal; at least one charge compensation circuit located on one side of the substrate, each charge compensation circuit comprising a switching transistor and a storage capacitor; a gate of the switching transistor being coupled with a switching control line, a first pole of the switching transistor being coupled with a first pole plate of the storage capacitor, a second pole of the switching transistor being coupled with at least one touch electrode, and being configured to control a connection and disconnection between the at least one touch electrode and the first pole plate of the storage capacitor based on a switching control signal; a second pole plate of the storage capacitor being coupled with a charge compensation line, and being configured to adjust a potential of the first pole plate of the storage capacitor based on a charge compensation signal provided by the charge compensation line; wherein the switching control line and the charge compensation line are both configured to be coupled with the driving chip, and configured to receive a switching control signal and a charge compensation signal provided by the driving chip. 2.The touch display panel of claim 1, wherein, The storage capacitor comprises: a first electrode and a second electrode located on one side of the substrate and stacked in a first direction in sequence; The switching transistor comprises: a gate metal layer and a source-drain metal layer located on one side of the substrate and stacked in the first direction in sequence, the source-drain metal layer comprising a source metal layer and a drain metal layer arranged in a second direction in sequence, the second direction intersecting the first direction; and the gate metal layer serving as a gate of the switching transistor; one of the source metal layer and the drain metal layer serving as a first pole of the switching transistor, and the other serving as a second pole of the switching transistor; the first electrode serving as a second pole plate of the storage capacitor; and the second electrode serving as a first pole plate of the storage capacitor. 3.The touch display panel of claim 2, wherein, A normal projection of the second electrode on the substrate covers a normal projection of the first electrode on the substrate. 4.The touch display panel of claim 2, wherein, The first electrode and the source-drain metal layer are located in the same layer, and the second electrode and the touch electrode are located in the same layer; and the touch display panel further comprises: an insulating layer located between the source-drain metal layer and the second electrode; the second electrode and the touch electrode are both coupled with the source-drain metal layer through a via penetrating the insulating layer. 5.The touch display panel of claim 2, wherein, Materials of the first electrode comprise: a metal conductive material; materials of the second electrode and the touch electrode comprise: a transparent conductive material. 6.The touch display panel according to any one of claims 1 to 5, wherein, Each charge compensation circuit is coupled with a plurality of touch electrodes; and each charge compensation circuit comprises: a plurality of switching sub-circuits corresponding to the plurality of touch electrodes coupled therewith in one-to-one correspondence, and one potential adjusting sub-circuit corresponding to the plurality of touch electrodes coupled therewith. 7.The touch display panel according to any one of claims 1 to 5, wherein, The plurality of touch electrodes are arranged in an array, and each charge compensation circuit is coupled with at least one touch electrode located in the same column. 8.The touch display panel of claim 7, wherein, The touch display panel comprises: a plurality of charge compensation circuits coupled with touch electrodes in the same column. And, in the plurality of charge compensation circuits, each charge compensation circuit is coupled with a different touch electrode, a different charge compensation line, and a different switch control line. 9.The touch display panel of claim 7, wherein, The touch display panel includes at least two charge compensation circuits coupled with the first column of touch electrodes and the last column of touch electrodes, respectively. 10.The touch display panel of claim 9, wherein, The touch display panel further includes peripheral circuits on the side of the first column of touch electrodes and the last column of touch electrodes, respectively. The charge compensation circuit coupled with the first column of touch electrodes is located between the peripheral circuit on the side of the first column of touch electrodes and the first column of touch electrodes, and the charge compensation circuit coupled with the last column of touch electrodes is located between the peripheral circuit on the side of the last column of touch electrodes and the last column of touch electrodes. 11.A driving method of a touch display panel, comprising: The method is applied to the touch display panel of any one of claims 1 to 10, and the method comprises: providing display signals to a plurality of touch electrodes through a plurality of transmission lines to drive the touch display panel to display a picture and realize a display function; in response to a touch enable signal, providing a charge compensation signal to a charge compensation line and providing a valid potential switch control signal to a switch control line, and a switch transistor controls the conduction of a first plate of a storage capacitor coupled with a touch electrode in response to the valid potential switch control signal, and the storage capacitor adjusts the potential of the first plate of the storage capacitor based on the charge compensation signal provided by the charge compensation line coupled with the storage capacitor; in response to a sensing enable signal, providing touch signals to the plurality of touch electrodes through the plurality of transmission lines to drive the plurality of touch electrodes to feedback touch sensing signals and realize a touch sensing function; wherein the potential of the touch signal is different from the potential of the display signal.

12. The driving method according to claim 11, wherein The method further comprises: when providing display signals to a plurality of touch electrodes through a plurality of transmission lines, providing an invalid potential switch control signal to the switch control line, and the charge compensation circuit controls the decoupling of the coupled touch electrode and the charge compensation line in response to the invalid potential switch control signal.

13. A touch display device, comprising: The touch display device comprises a driving chip and a touch display panel as claimed in any one of claims 1 to 10. The driving chip is coupled with the touch display panel and is configured to drive the touch display panel to realize a display function and a touch sensing function.

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