Touch display panel and driving method therefor, and touch display apparatus

Abstract

Provided in the present disclosure are a touch display panel and a driving method therefor, and a touch display apparatus. The driving method comprises: during a normal display phase, inputting corresponding target signals to various signal input terminals coupled to shift registers, on the basis of the target signals, a plurality of shift registers outputting stage by stage gate driving signals to coupled gate lines, and when each stage of shift register outputs a gate driving signal to a coupled gate line, inputting corresponding display data signals to a plurality of data lines; and during a discharge phase, inputting corresponding target signals to various signal input terminals coupled to shift registers, on the basis of the target signals, a plurality of shift registers outputting stage by stage gate driving signals to coupled gate lines, and when each stage of shift register outputs a gate driving signal to a coupled gate line, inputting ground signals to a plurality of data lines.

Description

Touch display panel and its driving method, touch display device Technical Field

[0001] This disclosure relates to the field of touch display technology, and in particular to a touch display panel and its driving method, and a touch display device. Background Technology

[0002] After prolonged use, the characteristics of existing display products tend to drift. Product reliability testing reveals that the characteristic curves generally shift to the left, and the leakage current Ioff increases in the off-state under the same gate-source voltage conditions. Meanwhile, to ensure that display products do not flicker due to charge buildup after power-on or wake-up from sleep mode, they generally employ a power-off XON sequence. This releases the charge within the display product before power-off or entering sleep mode, thereby minimizing the risk of flicker.

[0003] Summary of the Invention

[0004] The purpose of this disclosure is to provide a touch display panel and its driving method, as well as a touch display device.

[0005] To achieve the above objectives, this disclosure provides the following technical solution:

[0006] The first aspect of this disclosure provides a driving method for a touch display panel, the touch display panel including a gate driving circuit, a plurality of sub-pixels, a plurality of gate lines, and a plurality of data lines; the gate driving circuit includes a plurality of cascaded shift registers, the gate driving signal output terminal of the shift registers being coupled to a corresponding gate line; each sub-pixel includes a driving transistor and a pixel electrode, the gate of the driving transistor being coupled to a corresponding gate line, the first electrode of the driving transistor being coupled to a corresponding data line, and the second electrode of the driving transistor being coupled to the pixel electrode; the driving method includes:

[0007] During the normal display phase, corresponding target signals are input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line, corresponding display data signals are input to the multiple data lines.

[0008] During the discharge phase, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines.

[0009] Optionally, during the discharge phase, at least two frames of discharge timing are executed. When executing each frame of discharge timing, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines.

[0010] Optionally, the execution of each frame's discharge timing includes a discharge period and a buffer period;

[0011] During the discharge period, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines.

[0012] During the buffer period, a first-level signal is input to the various signal input terminals coupled to each of the shift registers.

[0013] Optionally, the driving method further includes:

[0014] During the black screen display phase, which is located between the normal display phase and the discharge phase, n frames of black screen display timing are executed, where n≥0. When executing each frame of black screen display timing, a corresponding target signal is input to the various signal input terminals coupled to each shift register. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a corresponding black screen data signal is input to the multiple data lines.

[0015] Optionally, the touch display panel further includes a common electrode layer, which includes a plurality of common electrode patterns, wherein the orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate.

[0016] The driving method further includes:

[0017] During the transition phase following the discharge phase, ground signals are input to the various signal input terminals coupled to the shift register; ground signals are input to the multiple data lines; and ground signals are input to the common electrode layer.

[0018] Optionally, the driving method further includes a touch sensing phase following the transition phase:

[0019] The signals input to the various signal input terminals coupled to the shift register are all at their corresponding voltage levels, and a modulation signal is superimposed on the signals input to the various signal input terminals; a modulation signal is superimposed on the ground signal input to the data line; and a modulation signal is superimposed on the ground signal input to the common electrode layer.

[0020] Sensing signal changes on the common electrode layer to acquire sensing signals;

[0021] Based on the sensing signal, it is determined whether to enter the next normal display stage.

[0022] Optionally, the driving method further includes a holding phase located between the transition phase and the touch sensing phase.

[0023] Maintain ground signals input to all signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines; maintain ground signals input to the common electrode layer.

[0024] Based on the above-described driving method for a touch display panel, a second aspect of this disclosure provides a touch display panel driven by the aforementioned driving method. The touch display panel includes a gate driving circuit, multiple sub-pixels, multiple gate lines, and multiple data lines. The gate driving circuit includes multiple cascaded shift registers, with the gate driving signal output terminal of each shift register coupled to a corresponding gate line. Each sub-pixel includes a driving transistor and a pixel electrode. The gate of the driving transistor is coupled to a corresponding gate line, the first electrode of the driving transistor is coupled to a corresponding data line, and the second electrode of the driving transistor is coupled to the pixel electrode. The touch display panel also includes a driving chip.

[0025] During the normal display phase, the driver chip is used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals; the driver chip is also used to input corresponding display data signals to the multiple data lines when each shift register outputs a gate drive signal to the coupled gate line.

[0026] During the discharge phase, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals; the driver chip is also used to input ground signals to the multiple data lines when each shift register outputs gate drive signals to the coupled gate lines.

[0027] Optionally, during the discharge phase, the touch display panel is used to execute at least two frames of discharge timing; the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers when executing each frame of discharge timing, the plurality of shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals, and the driver chip is also used to input ground signals to the plurality of data lines when each shift register outputs gate drive signals to the coupled gate lines.

[0028] Optionally, the execution of each frame's discharge timing includes a discharge period and a buffer period;

[0029] During the discharge period, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals. The driver chip is also used to input ground signals to the multiple data lines when each shift register outputs a gate drive signal to the coupled gate line.

[0030] During the buffer period, the driver chip is also used to input a first level signal to the various signal input terminals coupled to each of the shift registers.

[0031] Optionally, the touch display panel is used to execute n frames of black screen display timing, where n≥0, during the black screen display phase located between the normal display phase and the discharge phase. When executing each frame of black screen display timing, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals. The driver chip is also used to input corresponding black screen data signals to the multiple data lines when each shift register outputs gate drive signals to the coupled gate lines.

[0032] Optionally, the touch display panel further includes a common electrode layer, which includes a plurality of common electrode patterns, wherein the orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate.

[0033] During the transition phase following the discharge phase, the driver chip is also used to input ground signals to various signal input terminals coupled to the shift register; the driver chip is also used to input ground signals to the multiple data lines; and the driver chip is also used to input ground signals to the common electrode layer.

[0034] Optionally, in the touch sensing stage following the transition stage: the driver chip is further configured to control the signals input to various signal input terminals coupled to the shift register to be at the corresponding voltage levels, and to superimpose a modulation signal on the signals input to various signal input terminals; to superimpose a modulation signal on the ground signal input to the data line; and to superimpose a modulation signal on the ground signal input to the common electrode layer.

[0035] The driving chip is also used to sense signal changes on the common electrode layer and acquire sensing signals;

[0036] The driver chip is also used to determine whether to enter the next normal display stage based on the sensing signal.

[0037] Optionally, a holding phase located between the transition phase and the touch sensing phase:

[0038] The driver chip is also used to maintain ground signals input to various signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines; and maintain ground signals input to the common electrode layer.

[0039] Based on the above-described technical solution for the touch display panel, a third aspect of this disclosure provides a touch display device, including the aforementioned touch display panel. Attached Figure Description

[0040] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0041] Figure 1 shows the characteristic drift of the touch display panel provided in the embodiment of this disclosure after a reliability test.

[0042] Figure 2 is a schematic diagram of a pixel structure in a touch display panel provided in an embodiment of this disclosure;

[0043] Figure 3 is a schematic diagram of the XON discharge timing of the touch display panel provided in the embodiment of this disclosure;

[0044] Figure 4 is a schematic diagram of the generation mechanism of LPWG Noise provided in the embodiments of this disclosure;

[0045] Figure 5 is a timing diagram of the embodiment of this disclosure using Solution 1;

[0046] Figure 6 is a timing diagram of the embodiment of this disclosure using Solution 2;

[0047] Figure 7 is a schematic diagram of the coupling of the shift register provided in an embodiment of this disclosure;

[0048] Figure 8 is another schematic diagram of the pixel structure in the touch display panel provided in the embodiment of this disclosure;

[0049] Figure 9 is a timing diagram of various signals when the touch display panel provided in the embodiment of this disclosure performs the XON discharge timing;

[0050] Figure 10 is a timing diagram of various signals when the touch display panel provided in the embodiment of this disclosure executes a new discharge timing sequence;

[0051] Figure 11 is a comparison diagram of the timing of each signal when the touch display panel provided in the embodiment of this disclosure executes different discharge timing sequences and does not execute discharge timing sequences;

[0052] Figure 12 is another timing diagram of various signals when the touch display panel provided in the embodiment of this disclosure executes a new discharge timing sequence. Detailed Implementation

[0053] To further illustrate the touch display panel and its driving method, as well as the touch display device provided in the embodiments of this disclosure, a detailed description is provided below with reference to the accompanying drawings.

[0054] Figure 1 illustrates the shift of the characteristic curves of the devices in the display area to the left before and after reliability testing. In Figure 1, the horizontal axis represents the gate-source voltage Vgs of the device, and the vertical axis represents the drain-to-source current Ids. The dashed curve represents the characteristic curve before reliability testing, and the solid curve represents the characteristic curve after reliability testing.

[0055] Figure 2 illustrates the pixel structure within the display area of ​​a display product. This pixel structure includes a TFT device and a pixel electrode. The gate of the TFT device is coupled to a corresponding gate line GA, which receives a scan signal. The source of the TFT device is coupled to the pixel electrode, and the drain of the TFT device is coupled to a corresponding data line DA, which receives a data signal. The pixel structure also includes a gate-source capacitor Cgs, a storage capacitor Cst, and a liquid crystal capacitor C. LC .

[0056] As shown in Figure 3, at the end of the display, before entering Low Power Wake-up Gesture (LPWG), the GOA Signal input to various signal input terminals coupled to the shift register is pulled up to a high level (19V in this example) to execute the XON discharge sequence. Its function is to discharge the charge on the pixel electrodes, reducing the risk of flickering after power-on following sleep / wake-up. However, in actual verification, it has been found that enabling the XON discharge sequence in an increasing number of products leads to an increase in LPWG noise in products with higher reliability. Some products exhibit problems such as inability to wake up by gesture after sleep or false wake-up of ghost points under no-gesture conditions after sleep. Figure 3 also illustrates the VCOM signal transmitted on the common electrode layer and the signal transmitted on the data line DA. The P1 stage in Figure 3 is the Baseline stage, used to obtain a comparison reference, and the P2 stage is the Difference Calculation stage, used to calculate the difference and determine whether the user has touched the screen. Figure 3 illustrates the superposition of modulation signals on the voltage levels of each signal in the P1 and P2 stages.

[0057] It's important to note that LPWG is a common operating mode for touch display products. Its key feature is that it ensures that mobile devices enter a sleep mode when the user has not touched the screen for an extended period. In this mode, the display function is disabled to conserve power, while only the touch function is retained to respond to user gestures and wake the display. In this operating mode, display timing is disabled, and the driver retains only the touch response function. Therefore, the execution of LPWG is a process of switching from display mode timing to sleep / wake-up timing.

[0058] As shown in Table 1, the table illustrates that without reliability testing (i.e., without RA), both enabling and disabling XON discharge timing (i.e., LPWG XON enabled) ensure LPWG noise meets requirements. However, with reliability testing (i.e., after RA), enabling XON discharge timing likely results in LPWG noise failing to meet requirements (i.e., high probability of NG), while disabling XON discharge timing results in LPWG noise meeting requirements. Therefore, the analysis concludes that the factors affecting LPWG noise include: changes in display panel characteristics; and the execution of XON discharge timing. Both of these factors combined lead to LPWG noise NG.

[0059] Table 1

[0060] As shown in Figures 2 and 3, the voltage change of the GOA Signal will affect the voltage of the pixel electrode through the gate-source capacitance Cgs. Furthermore, when the XON timing is enabled, the voltage of the pixel electrode changes faster due to the increased leakage current in the early stage of baseline establishment.

[0061] More specifically, as shown in Figure 4, the generation mechanism of LPWG noise is illustrated. On the one hand, before the product enters the LPWG, the XON discharge sequence is activated, and the voltage difference of the GOA signal changes greatly, which has a large pull on the voltage of the pixel electrode. On the other hand, the product undergoes a high-temperature reliability test, and the product Ioff increases. The above two factors result in a long period of charge instability of the pixel electrode in the P1 stage, which in turn leads to LPWG noise NG.

[0062] Since the XON discharge timing is beneficial to LPWG flicker but detrimental to LPWG noise, technical solutions need to be found to ensure that both of these product characteristics can be guaranteed to be safe and stable.

[0063] Solution 1: As shown in Figure 5, the activation of the XON discharge sequence prolongs the charge instability time of the pixel electrode in stage P1. Therefore, delaying the establishment of the baseline could be considered to ensure that the voltage waveform of the pixel electrode has stabilized as much as possible while waiting for the baseline to be acquired. However, actual testing revealed that this stabilization time often exceeds one second, which is unacceptable for actual customer needs. Furthermore, the industry standard for sleep / wake-up response time is generally around 0.5 seconds. Therefore, this modification cannot be applied to actual products.

[0064] More specifically, in the original timing sequence of the GOA Signal in Figure 5, the P1 stage is not delayed. In the delayed P1 stage timing sequence, the P1 stage is delayed, and a 1.5-second Skip stage is inserted before the P1 stage. The dense area on the far left of Figure 5 represents multi-frame scanning, the thin high pulses in the P1 and P2 stages represent frame-by-frame scanning, the dense short pulses in the P1 stage represent multi-frame superimposed modulation signals, and the short pulses in the P2 stage represent one frame superimposed modulation signal.

[0065] Solution 2, as shown in Figure 6, directly disables the XON discharge timing. This modification significantly improves LPWG noise by reducing the voltage difference change of the GOA Signal signal before entering LPWG, from 0V to -6V (compared to the change from 19V to -6V when XON discharge timing is enabled). However, in actual product sleep / wake-up tests, it was found that after multiple wake-ups, the product flicker generally deteriorated, posing a significant risk of sleep / wake-up flicker.

[0066] Considering the improvements and problems of the above solutions, a new solution needs to be found that can meet the requirements for product charge discharge while reducing the voltage difference of the scanning signal G-OUT.

[0067] Please refer to Figures 7, 8, 10, and 11. This disclosure provides a driving method for a touch display panel. The touch display panel includes a gate driving circuit, multiple sub-pixels, multiple gate lines GA, and multiple data lines DA. The gate driving circuit includes multiple cascaded shift registers, with the gate driving signal output terminal OUT of each shift register coupled to the corresponding gate line GA. Each sub-pixel includes a driving transistor TFT1 and a pixel electrode. The gate of the driving transistor TFT1 is coupled to the corresponding gate line GA, the first electrode of the driving transistor TFT1 is coupled to the corresponding data line DA, and the second electrode of the driving transistor TFT1 is coupled to the pixel electrode. The driving method includes:

[0068] During the normal display phase, corresponding target signals are input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines GA step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line GA, corresponding display data signals are input to the multiple data lines DA.

[0069] During the discharge phase, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines GA step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line GA, a ground signal is input to the multiple data lines DA.

[0070] For example, the touch display panel includes a display area and a peripheral area surrounding the display area. A plurality of sub-pixels are arrayed in the display area. A plurality of gate lines GA are located in the display area and extend from the display area to the peripheral area. A plurality of data lines DA are located in the display area and extend from the display area to the peripheral area. The gate lines GA extend along a first direction, and the data lines DA extend along a second direction, the first direction intersecting the second direction. A gate driving circuit is located in the peripheral area. The gate driving circuit includes a plurality of cascaded shift registers. The gate driving signal output terminal OUT of each shift register is coupled to at least one corresponding gate line GA, providing a scan signal to the coupled at least one gate line GA.

[0071] For example, the specific structure of the shift register unit can vary, and this disclosure does not limit the specific structure of the shift register.

[0072] For example, the touch display panel includes an array substrate and a counter substrate disposed opposite each other, wherein the gate driving circuit, the gate line GA, the data line DA, the driving transistor TFT1 in the sub-pixel, and the pixel electrode are all located on the array substrate. The touch display panel also includes a liquid crystal layer located between the array substrate and the counter substrate.

[0073] For example, the touch display panel further includes a driver chip. The driver chip has various signal input terminals coupled to the shift register, which are used to input corresponding signals to these input terminals, thereby controlling the operating state of the shift register. The driver chip is also coupled to the data line DA, and is used to input corresponding signals to the data line DA.

[0074] Research revealed that, as shown in Figure 9, during stage t3, the GOA Signal inputs to the various signal input terminals coupled to the shift register are pulled up to a high level VGH, such as VGH = 19V. Depending on the specific structure of the shift register, the GOA Signal may include GOA Signal-1 and / or GOA Signal-2. For example, GOA Signal-1 includes at least one of the following: VDS, GCH, CLK, VSD, VGL, and STV0, but is not limited to these. GOA Signal-2 includes the Reset signal and / or GCL signal, but is not limited to these.

[0075] In stage t3 above, all shift registers output gate drive signals to simultaneously scan each row of sub-pixels. All driving transistors TFT1 coupled to each gate line GA in the touch display panel are turned on, and ground signals are input to each data line DA to release the charge from the pixel electrodes. When this timing is applied to the touch display panel, after the touch display panel undergoes RA testing, it can cause LPWG noise, leading to serious touch anomalies such as the inability to wake from sleep mode or false wake-up of ghost points after sleep mode.

[0076] More specifically, after executing the timing sequence in stage t3 of Figure 9, a significant number of raw data values ​​have reached the threshold Max. The baseline established using these raw data values ​​is not accurate enough (e.g., too high), which can easily lead to a serious risk of touch failure. If the timing sequence in stage t3 is directly turned off, in actual testing of some products, short-term multiple consecutive sleep-wake tests will occur, resulting in an increase in the flicker value, which in severe cases will manifest as screen flickering after wake-up. Based on the above conclusions, discharging by executing the timing sequence in stage t3 will cause LPWG noise problems in the product after RA testing, leading to touch failure; while turning off the timing sequence in stage t3 will cause screen flickering problems after sleep-wake.

[0077] As shown in Figure 10, in the driving method of the touch display panel provided in this embodiment, during the normal display stage, i.e., stage t1, corresponding target signals are input to the various signal input terminals coupled to each of the shift registers. These various signal input terminals are used to input: GOA Signal-1 signal and / or GOA Signal-2 signal. All GOA Signal-1 signals and / or GOA Signal-2 signals are adjusted to the corresponding target signals. These target signals have a high level VGH = 19V and a low level VGL = -11V, but are not limited to these. Based on this target signal, the multiple shift registers can sequentially output gate drive signals to the coupled gate lines GA, i.e., realize line-by-line scanning of pixel rows in the touch display panel. When each shift register outputs a gate drive signal to the coupled gate line GA, corresponding display data signals are input to the multiple data lines DA, realizing the normal display function of the touch display panel. Figure 10 also illustrates the lowest level value Data- and the highest level value Data+ of the data signals.

[0078] In the driving method of the touch display panel provided in this embodiment, as shown in FIG10, during the discharge stage, i.e., stage t3, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. Based on the target signal, the multiple shift registers can realize the step-by-step output of gate drive signals to the coupled gate lines GA, that is, realize the step-by-step scanning of pixel rows in the touch display panel. When each shift register outputs the gate drive signal to the coupled gate line GA, a ground signal is input to the multiple data lines DA, thereby realizing the charge release of the pixel electrodes. Therefore, when driving the touch display panel using the driving method provided in this embodiment, it can be compatible with the existing basic architecture of the touch display panel. On the basis of disabling the XON timing, during the original execution time of the XON timing, the pixel rows are scanned step-by-step through multiple cascaded shift registers, and ground signals are written to the pixel electrodes of each sub-pixel to realize the charge release of the pixel electrodes.

[0079] The driving method provided in this disclosure can be applied to touch display panels that experience characteristic drift during long-term use. It stabilizes LPWG noise while suppressing flicker during sleep / wake-up, thus improving product performance. This avoids the need to trade off between noise and flicker issues, achieving improved sleep / wake-up quality for touch products. Therefore, when driving a touch display panel using the driving method provided in this disclosure, LPWG Touch functionality is ensured while sleep / wake-up discharge is considered, resolving the flickering problem.

[0080] More specifically, as shown in Figure 11, in stage t3, a comparison was made between three scenarios: executing the XON enabled timing sequence, disabling the XON timing sequence, and executing the timing sequence provided in this application. In all three scenarios, the touch display panel was continuously awakened from sleep 50 times. The results showed that when executing the XON enabled timing sequence, the product's sleep-wake flicker value was +0.56; when executing the XON disabled timing sequence, the product's sleep-wake flicker value ranged from +2.61 to 3.76; and when executing the timing sequence provided in this application, the product's sleep-wake flicker value ranged from -0.96 to +1.02. It is evident that executing the timing sequence provided in this application significantly improves the product's sleep-wake flicker value.

[0081] As shown in Figure 12, in some embodiments, during the discharge phase, at least two frames of discharge timing are executed. When executing each frame of discharge timing, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines GA step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line GA, a ground signal is input to the multiple data lines DA.

[0082] For example, during the discharge phase, multiple frames of discharge timing are executed, but this is not the only option.

[0083] In the driving method provided in the above embodiments, at least two frames of discharge timing are executed during the discharge phase, which can better realize the charge release of the pixel electrode and is conducive to better stabilizing LPWG Noise.

[0084] As shown in Figure 11, in some embodiments, the execution of each frame discharge timing includes a discharge period and a buffer period;

[0085] During the discharge period, i.e., the t31 period, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines GA step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line GA, a ground signal is input to the multiple data lines DA.

[0086] During the buffer period, i.e., the t32 period, a first level signal is input to the various signal input terminals coupled to each of the shift registers.

[0087] For example, the first level signal includes a low level signal, such as the VGL signal, but is not limited to this.

[0088] The above-described discharge timing configuration for each frame includes a discharge period and a buffer period. This allows for charge release during the discharge period and stabilizes the signal states at each input terminal after the discharge period ends during the buffer period. This ensures a stable transition of signals at the input terminals after the current frame's discharge timing ends, whether entering the next frame's discharge timing or the next stage. Simultaneously, inputting a first-level signal to the various signal input terminals coupled to the shift registers during the buffer period helps reduce the voltage difference of the transmitted signals when transitioning from the buffer period to subsequent stages, improving the voltage instability of the pixel electrodes and thus improving LPWG noise.

[0089] As shown in Figures 10 and 12, in some embodiments, the driving method further includes:

[0090] During the black screen display phase, i.e., phase t2, which is located between the normal display phase and the discharge phase, n frames of black screen display timing are executed, where n≥0. When executing each frame of black screen display timing, a corresponding target signal is input to the various signal input terminals coupled to each shift register. The multiple shift registers output gate drive signals to the coupled gate lines GA step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line GA, a corresponding black screen data signal is input to the multiple data lines DA.

[0091] For example, when n=0, the black screen display timing is not executed; that is, after the normal display phase ends, the discharge phase begins directly. When n≥1, at least one frame of black screen display timing is executed. During the execution of each frame of black screen display timing, the multiple shift registers output gate drive signals to the coupled gate lines GA step by step. When each shift register outputs a gate drive signal to the coupled gate line GA, the corresponding black screen data signal is input to the multiple data lines DA to realize the black screen display of the touch display panel.

[0092] When driving a touch display device using the driving method provided in the above embodiments, before the discharge stage, it is possible to control whether to execute a black screen display sequence and the number of frames of the black screen display sequence, according to actual needs. In this way, before entering the discharge stage, the charge of the pixel electrode can be reduced in advance by executing the black screen display sequence, so that the charge of the pixel electrode can be better released in the subsequent discharge stage.

[0093] As shown in Figures 10 and 12, in some embodiments, the touch display panel further includes a common electrode layer, which includes a plurality of common electrode patterns. The orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate.

[0094] The driving method further includes:

[0095] During the transition phase following the discharge phase, i.e., phase t4, ground signals are input to the various signal input terminals coupled to the shift register; ground signals are input to the multiple data lines DA; and ground signals are input to the common electrode layer.

[0096] For example, the common electrode layer is reused as a touch electrode layer, and the common electrode pattern is reused as a touch electrode pattern, that is, the common electrode layer can realize different functions in time-division multiplexing.

[0097] For example, the t1, t2, t3 and t4 stages that the touch display panel goes through in sequence are divided into display stages. After the t4 stage ends, the display stage ends and the LPWG stage will begin.

[0098] When driving a touch display device using the driving method provided in the above embodiments, a transition phase is entered after the discharge phase. During this transition phase, ground signals are input to various signal input terminals, the multiple data lines DA, and the common electrode layer. In this way, when the touch sensing phase is subsequently entered, the signals transmitted on various signal input terminals, the multiple data lines DA, and the common electrode layer are closer to the corresponding voltage levels.

[0099] More specifically, for the GOA Signal-1 signal transmitted from various signal input terminals, its voltage level is -6V after entering the touch sensing stage. Therefore, when transitioning from the discharge stage to the touch sensing stage, the maximum voltage difference of the GOA Signal-1 signal is 0V→-6V. Thus, the above driving method significantly reduces the voltage difference during this process, improving the voltage instability problem of the pixel electrode and thereby improving LPWG noise. In contrast, in the aforementioned scheme employing XON timing, the maximum voltage difference of the GOA Signal-1 signal when transitioning from the discharge stage to the touch sensing stage is 19V→-6V, exhibiting a larger voltage difference.

[0100] As shown in Figures 10 and 12, in some embodiments, the driving method further includes a touch sensing phase following the transition phase, i.e., phase t6:

[0101] The signals input to the various signal input terminals coupled to the shift register are all at their corresponding voltage levels, and a modulation signal is superimposed on the signals input to the various signal input terminals; a modulation signal is superimposed on the ground signal input to the data line DA; and a modulation signal is superimposed on the ground signal input to the common electrode layer.

[0102] Sensing signal changes on the common electrode layer to acquire sensing signals;

[0103] Based on the sensing signal, it is determined whether to enter the next normal display stage.

[0104] For example, the touch sensing phase includes the aforementioned P1 phase and P2 phase.

[0105] For example, during the touch sensing phase, the GOA Signal-1 signals input to the various signal input terminals coupled to the shift register are all at their corresponding voltage levels of -6V, and the GOA Signal-2 signals input to the various signal input terminals coupled to the shift register are all at their corresponding voltage levels of 6V, but this is not limited to these. The 0V ground signal transmitted by the data line DA is used as its voltage level. The 0V ground signal transmitted by the common electrode layer is used as its voltage level.

[0106] For example, the touch display device includes a driver chip that can output a VSP signal (high-level signal), a VSN signal (low-level signal), and a ground signal; for example, the VSP signal can be 6V, the VSN signal can be -6V, and the ground signal can be 0V. For example, during the touch sensing phase, the voltage level of the GOA Signal-1 signal can be the same as the VSN signal, and the voltage level of the GOA Signal-2 signal can be the same as the VSP signal. Since the VSP and VSN signals are inherent output signals of the driver chip, the above configuration allows the GOA Signal-1 signal to directly use the VSN signal and the GOA Signal-2 signal to directly use the VSP signal during the touch sensing phase, eliminating the need for boost or buck circuits to obtain the GOA Signal-1 and GOA Signal-2 signals.

[0107] After entering the touch sensing stage, after superimposing modulation signals on each signal, the signal changes on the common electrode layer are sensed to obtain the sensing signal; based on the sensing signal, it is determined whether a wake-up gesture has occurred, and then it is determined whether to enter the next normal display stage.

[0108] As shown in Figures 10 and 12, in some embodiments, the driving method further includes a holding phase, i.e., phase t5, located between the transition phase and the touch sensing phase.

[0109] Maintain ground signals input to all signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines DA; maintain ground signals input to the common electrode layer.

[0110] For example, the holding phase can last for multiple frames, but is not limited to this.

[0111] Setting a hold phase between the transition phase and the touch sensing phase not only ensures a more stable transition of the signal input at the signal input terminal, but also helps to improve the voltage instability problem of the pixel electrode, thereby improving LPWG noise.

[0112] This disclosure also provides a touch display panel driven by the driving method provided in the above embodiments. The touch display panel includes a gate driving circuit, multiple sub-pixels, multiple gate lines GA, and multiple data lines DA. The gate driving circuit includes multiple cascaded shift registers, and the gate driving signal output terminal OUT of the shift register is coupled to the corresponding gate line GA. The sub-pixel includes a driving transistor TFT1 and a pixel electrode. The gate of the driving transistor TFT1 is coupled to the corresponding gate line GA, the first electrode of the driving transistor TFT1 is coupled to the corresponding data line DA, and the second electrode of the driving transistor TFT1 is coupled to the pixel electrode. The touch display panel also includes a driving chip.

[0113] During the normal display phase, the driver chip is used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines GA step by step based on the target signals; the driver chip is also used to input corresponding display data signals to the multiple data lines DA when each shift register outputs a gate drive signal to the coupled gate line GA.

[0114] During the discharge phase, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines GA step by step based on the target signals; the driver chip is also used to input ground signals to the multiple data lines DA when each shift register outputs a gate drive signal to the coupled gate line GA.

[0115] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiments, it can be compatible with the existing infrastructure of the touch display panel. Based on disabling the XON timing, during the original execution time of the XON timing, multiple cascaded shift registers are used to scan the pixel rows level by level, and ground signals are written to the pixel electrodes of each sub-pixel, thereby releasing the charge on the pixel electrodes. Furthermore, when the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiments, it can be compatible with touch display panels that have experienced characteristic drift over long periods of use. It can stabilize LPWG Noise while suppressing sleep / wake-up flicker, thus improving product performance. Therefore, when the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiments, it ensures LPWG Touch functionality while also addressing sleep / wake-up discharge, solving the product flicker problem.

[0116] In some embodiments, during the discharge phase, the touch display panel is used to execute at least two frames of discharge timing; the driver chip is also used to input a corresponding target signal to various signal input terminals coupled to each of the shift registers when executing each frame of discharge timing, the plurality of shift registers are used to output gate drive signals to the coupled gate lines GA step by step based on the target signal, and the driver chip is also used to input a ground signal to the plurality of data lines DA when each shift register outputs a gate drive signal to the coupled gate line GA.

[0117] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, at least two frames of discharge timing are executed in the discharge stage, which can better realize the charge release of the pixel electrode and is conducive to better stabilizing LPWG Noise.

[0118] In some embodiments, the execution of each frame discharge timing includes a discharge period and a buffer period;

[0119] During the discharge period, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The multiple shift registers are used to output gate drive signals to the coupled gate lines GA step by step based on the target signals. The driver chip is also used to input ground signals to the multiple data lines DA when each shift register outputs a gate drive signal to the coupled gate line GA.

[0120] During the buffer period, the driver chip is also used to input a first level signal to the various signal input terminals coupled to each of the shift registers.

[0121] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, charge release can be achieved during the discharge period, and the state of the signals input to each signal input terminal of the current frame can be stabilized after the discharge period ends during the buffer period. Thus, after the discharge sequence of the current frame ends, whether entering the next frame discharge sequence or the next stage, the signals input to the signal input terminals can be stably transitioned. Simultaneously, inputting a first-level signal to each of the various signal input terminals coupled to the shift registers during the buffer stage helps reduce the voltage difference of the signals transmitted at the various signal input terminals when transitioning from the buffer stage to the subsequent stage, improving the voltage instability problem of the pixel electrodes, and thus improving LPWG noise.

[0122] In some embodiments, the touch display panel is used to execute n frames of black screen display timing, where n≥0, during the black screen display phase located between the normal display phase and the discharge phase. When executing each frame of black screen display timing, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The plurality of shift registers are used to output gate drive signals to the coupled gate lines GA step by step based on the target signals. The driver chip is also used to input corresponding black screen data signals to the plurality of data lines DA when each shift register outputs a gate drive signal to the coupled gate line GA.

[0123] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, before the discharge stage, it is possible to control whether to execute the black screen display sequence and the number of frames of the black screen display sequence, according to actual needs. In this way, before entering the discharge stage, the charge of the pixel electrode can be reduced in advance by executing the black screen display sequence, so as to better release the charge of the pixel electrode in the subsequent discharge stage.

[0124] In some embodiments, the touch display panel further includes a common electrode layer, the common electrode layer including a plurality of common electrode patterns, wherein the orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate;

[0125] During the transition phase following the discharge phase, the driver chip is also used to input ground signals to various signal input terminals coupled to the shift register; the driver chip is also used to input ground signals to the multiple data lines DA; and the driver chip is also used to input ground signals to the common electrode layer.

[0126] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, it enters a transition phase after the discharge phase. In this transition phase, ground signals are input to various signal input terminals, the multiple data lines DA, and the common electrode layer. In this way, when the touch sensing phase is subsequently entered, the signals transmitted on various signal input terminals, the multiple data lines DA, and the common electrode layer are closer to the corresponding voltage levels.

[0127] In some embodiments, during the touch sensing phase following the transition phase: the driver chip is further configured to control the signals input to various signal input terminals coupled to the shift register to be at corresponding voltage levels, and to superimpose a modulation signal on the signals input to various signal input terminals; to superimpose a modulation signal on the ground signal input to the data line DA; and to superimpose a modulation signal on the ground signal input to the common electrode layer.

[0128] The driving chip is also used to sense signal changes on the common electrode layer and acquire sensing signals;

[0129] The driver chip is also used to determine whether to enter the next normal display stage based on the sensing signal.

[0130] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, after entering the touch sensing stage, after superimposing modulation signals on each signal, the signal change on the common electrode layer is sensed, and then the sensing signal is obtained; based on the sensing signal, it is determined whether a wake-up gesture has occurred, and then it is determined whether to enter the next normal display stage.

[0131] In some embodiments, during the hold phase located between the transition phase and the touch sensing phase:

[0132] The driver chip is also used to maintain ground signals input to various signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines DA; and maintain ground signals input to the common electrode layer.

[0133] When the touch display panel provided in this embodiment is driven by the driving method provided in the above embodiment, a holding phase is set between the transition phase and the touch sensing phase. This not only ensures that the signal input at the signal input terminal can transition more stably, but also helps to improve the voltage instability problem of the pixel electrode, thereby improving LPWG noise.

[0134] This disclosure also provides a touch display device, including the touch display panel provided in the above embodiments.

[0135] It should be noted that the touch display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device also includes flexible circuit boards, printed circuit boards, and backplanes.

[0136] For example, the touch display device includes a liquid crystal touch display device, but is not limited thereto.

[0137] When the touch display panel provided in the above embodiments is driven by the driving method provided in the above embodiments, it can be compatible with the existing infrastructure of the touch display panel. Based on disabling the XON timing, during the original execution time of the XON timing, multiple cascaded shift registers are used to scan the pixel rows level by level, and ground signals are written to the pixel electrodes of each sub-pixel, thereby releasing the charge on the pixel electrodes. Furthermore, when the touch display panel provided in the above embodiments is driven by the driving method provided in the above embodiments, it can be compatible with touch display panels that have experienced characteristic drift over long periods of use. It can stabilize LPWG Noise while suppressing sleep-wake flicker, thus improving product performance. Therefore, when the touch display panel provided in the above embodiments is driven by the driving method provided in the above embodiments, it ensures LPWG Touch functionality while also addressing sleep-wake discharge, solving the product flicker problem.

[0138] The touch display device provided in this embodiment of the present disclosure, when including the above-described touch display panel, also has the above-described beneficial effects, which will not be repeated here.

[0139] It should be noted that, in the embodiments of this disclosure, "same layer" can refer to film layers located on the same structural layer. Alternatively, for example, film layers located on the same layer can be layer structures formed by using the same film deposition process to form a specific pattern, and then patterning the film layer using the same photomask through a single patterning process. Depending on the specific pattern, the single patterning process may include multiple exposure, development, or etching processes, and the specific pattern in the formed layer structure can be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

[0140] In the various method embodiments of this disclosure, the sequence numbers of each step are not intended to limit the order of the steps. For those skilled in the art, any changes in the order of the steps are within the scope of protection of this disclosure without any creative effort.

[0141] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments are basically similar to the product embodiments, so the description is relatively simple, and the relevant parts can be referred to the description of the product embodiments.

[0142] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connection,” “coupled,” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0143] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

[0144] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0145] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A driving method for a touch display panel, the touch display panel comprising a gate driving circuit, a plurality of sub-pixels, a plurality of gate lines, and a plurality of data lines; the gate driving circuit comprising a plurality of cascaded shift registers, the gate driving signal output terminal of the shift registers being coupled to a corresponding gate line; the sub-pixel comprising a driving transistor and a pixel electrode, the gate of the driving transistor being coupled to a corresponding gate line, the first electrode of the driving transistor being coupled to a corresponding data line, and the second electrode of the driving transistor being coupled to the pixel electrode; the driving method comprising: During the normal display phase, corresponding target signals are input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signals. When each shift register outputs a gate drive signal to the coupled gate line, corresponding display data signals are input to the multiple data lines. During the discharge phase, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines.

2. The driving method for a touch display panel according to claim 1, wherein, During the discharge phase, at least two frames of discharge timing are executed. When each frame of discharge timing is executed, a corresponding target signal is input to the various signal input terminals coupled to each shift register. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines.

3. The driving method for a touch display panel according to claim 1 or 2, wherein, When executing the discharge timing for each frame, the discharge period and the buffer period are included; During the discharge period, a corresponding target signal is input to the various signal input terminals coupled to each of the shift registers. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a ground signal is input to the multiple data lines. During the buffer period, a first-level signal is input to the various signal input terminals coupled to each of the shift registers.

4. The driving method for a touch display panel according to claim 1 or 2, wherein, The driving method further includes: During the black screen display phase, which is located between the normal display phase and the discharge phase, n frames of black screen display timing are executed, where n≥0. When executing each frame of black screen display timing, a corresponding target signal is input to the various signal input terminals coupled to each shift register. The multiple shift registers output gate drive signals to the coupled gate lines step by step based on the target signal. When each shift register outputs a gate drive signal to the coupled gate line, a corresponding black screen data signal is input to the multiple data lines.

5. The driving method for a touch display panel according to claim 1 or 2, wherein, The touch display panel further includes a common electrode layer, which includes a plurality of common electrode patterns. The orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate. The driving method further includes: During the transition phase following the discharge phase, ground signals are input to the various signal input terminals coupled to the shift register; ground signals are input to the multiple data lines; and ground signals are input to the common electrode layer.

6. The driving method for a touch display panel according to claim 5, wherein, The driving method further includes a touch sensing phase following the transition phase: The signals input to the various signal input terminals coupled to the shift register are all at their corresponding voltage levels, and a modulation signal is superimposed on the signals input to the various signal input terminals; a modulation signal is superimposed on the ground signal input to the data line; and a modulation signal is superimposed on the ground signal input to the common electrode layer. Sensing signal changes on the common electrode layer to acquire sensing signals; Based on the sensing signal, it is determined whether to enter the next normal display stage.

7. The driving method for a touch display panel according to claim 6, wherein, The driving method further includes a holding phase located between the transition phase and the touch sensing phase: Maintain ground signals input to all signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines; maintain ground signals input to the common electrode layer.

8. A touch display panel driven by the driving method according to any one of claims 1 to 7, the touch display panel comprising a gate driving circuit, a plurality of sub-pixels, a plurality of gate lines, and a plurality of data lines; the gate driving circuit comprising a plurality of cascaded shift registers, the gate driving signal output terminal of the shift registers being coupled to the corresponding gate line; the sub-pixel comprising a driving transistor and a pixel electrode, the gate of the driving transistor being coupled to the corresponding gate line, the first electrode of the driving transistor being coupled to the corresponding data line, and the second electrode of the driving transistor being coupled to the pixel electrode; the touch display panel further comprising a driving chip; During the normal display phase, the driver chip is used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals; the driver chip is also used to input corresponding display data signals to the multiple data lines when each shift register outputs a gate drive signal to the coupled gate line. During the discharge phase, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers; the multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals; the driver chip is also used to input ground signals to the multiple data lines when each shift register outputs gate drive signals to the coupled gate lines.

9. The touch display panel according to claim 8, wherein, During the discharge phase, the touch display panel is used to execute at least two frames of discharge timing; the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers when executing each frame of discharge timing, the plurality of shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals, and the driver chip is also used to input ground signals to the plurality of data lines when each shift register outputs gate drive signals to the coupled gate lines.

10. The touch display panel according to claim 8 or 9, wherein, When executing the discharge timing for each frame, the discharge period and the buffer period are included; During the discharge period, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals. The driver chip is also used to input ground signals to the multiple data lines when each shift register outputs a gate drive signal to the coupled gate line. During the buffer period, the driver chip is also used to connect various types of shift registers. The first level signal is input at the signal input terminal.

11. The touch display panel according to claim 8 or 9, wherein, The touch display panel is used to execute n frames of black screen display timing, where n≥0, during the black screen display phase between the normal display phase and the discharge phase. When executing each frame of black screen display timing, the driver chip is also used to input corresponding target signals to various signal input terminals coupled to each of the shift registers. The multiple shift registers are used to output gate drive signals to the coupled gate lines step by step based on the target signals. The driver chip is also used to input corresponding black screen data signals to the multiple data lines when each shift register outputs gate drive signals to the coupled gate lines.

12. The touch display panel according to claim 8 or 9, wherein, The touch display panel further includes a common electrode layer, which includes a plurality of common electrode patterns. The orthographic projection of the common electrode patterns on the substrate of the touch display panel at least overlaps with the orthographic projection of the corresponding at least one pixel electrode on the substrate. During the transition phase following the discharge phase, the driver chip is also used to input ground signals to various signal input terminals coupled to the shift register; the driver chip is also used to input ground signals to the multiple data lines; and the driver chip is also used to input ground signals to the common electrode layer.

13. The touch display panel according to claim 12, wherein, In the touch sensing stage following the transition stage: the driver chip is also used to control the signals input to various signal input terminals coupled to the shift register to be at the corresponding voltage level, and to superimpose a modulation signal on the signals input to various signal input terminals; to superimpose a modulation signal on the ground signal input to the data line; and to superimpose a modulation signal on the ground signal input to the common electrode layer. The driving chip is also used to sense signal changes on the common electrode layer and acquire sensing signals; The driver chip is also used to determine whether to enter the next normal display stage based on the sensing signal.

14. The touch display panel according to claim 13, wherein, During the hold phase between the transition phase and the touch sensing phase: the driver chip is also used to maintain ground signals input to various signal input terminals coupled to the shift register; maintain ground signals input to the multiple data lines; and maintain ground signals input to the common electrode layer.

15. A touch display device, comprising a touch display panel as claimed in any one of claims 8 to 14.

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