TWI575490B - Touch in display panel and driving method thereof - Google Patents

Description

In-cell touch display panel and driving method thereof

The present invention relates to an in-cell touch display panel and a driving method thereof, and particularly relates to an in-cell touch display panel capable of improving a screen mura and a driving method thereof during touch.

The built-in Touch In Display (TID) is a new integrated display with both display and touch functions. This new panel is one of the new LCD panels developed by integrating the panel IC with the touch IC and matching the new production process of the LCD panel factory.

There is an in-cell touch display panel, which divides a common electrode (or a ground electrode) into a plurality of electrode blocks arranged in a matrix, and each electrode block is still used as a common common electrode during display, and is in touch. During the period, it is used as a touch sensing electrode, and the position of the touch object is determined by detecting the capacitance formed between the electrode block and the external touch object.

Figure 1 is a schematic top view showing a conventional in-cell touch display panel. As shown in FIG. 1, the area actually displayed on the in-line touch display panel 10 is referred to as a display area 11. In the display region 11, the common electrode is divided into a plurality of common electrode blocks S1, S2, ..., Sk, Sk+1, ..., Sm arranged in a matrix, and each of the common electrode blocks S1, S2, ..., Sk, Sk+1 ,...,Sm will pass through a metal Wires W1, W2, ..., Wk, Wk+1, ..., Wm are connected to the drive wafer. The driving chip outputs a common potential to all the common electrode blocks during the display period, and outputs a touch signal to each of the common electrode blocks during the touch period to detect whether there is a touch.

For the in-cell touch display panel, the general display and touch driving mode is a partition driving. In short, the display area of the panel is divided into several areas in the row direction, and each area is sequentially driven, when an area is When driving, the display driver is first entered and then the touch driver is entered. During the touch drive, the amorphous gate driving circuit (Gate On Panel (hereinafter referred to as GOP circuit)) on the panel pauses the output of the scan signal to the gate signal. In this way, each area has a period in which the scan signal is paused, and during the pause period, there may be a problem that the signal cannot be transmitted for the cascade connected GOP circuit. There may be a situation in which the boundary of the area may be stained before entering the display period before the touch period or during the touch period. In addition, there is a possibility that the driving period is degraded due to insufficient compression in the GOP circuit because the display period is compressed.

In view of the above problems, the present invention provides an in-cell touch display panel and a driving method thereof for improving the problem that the above-mentioned signals cannot be continuously transmitted, the color spots on the boundary of the area are generated, and the driving force of the GOP circuit is lowered.

The present invention provides an in-cell touch display panel (Touch In Display) panel, which is alternately driven during a display period and a touch period, and includes: a plurality of pixels disposed on the in-cell touch display panel; a plurality of gate lines respectively connected to the pixels of each column, wherein each of the gate lines is driven by a clock signal to send a scan signal during the display period, and the scanning signal is stopped during the touch period; N virtual gate lines, not connected to any pixel, cut during this display Before the touch period, each of the virtual gate lines is driven by a virtual clock signal to send a virtual scan signal, wherein N is greater than or equal to 1, wherein the N virtual gates of the N virtual gate lines are driven. The time points of the rising edges of the pulse signals are respectively synchronized with the time points at which the falling edges of the N clock signals of the N gate lines of the plurality of gate lines are driven.

According to an embodiment of the present invention, in the in-cell touch display panel, N of the clock signals are switched during the display period to N signals of the N gate lines that are last driven before the touch period.

According to another embodiment of the present invention, in the in-cell touch display panel, each of the N virtual gate lines is switched to the display period during the touch period, and is followed by a second virtual clock signal. Driving the virtual scan signal, wherein the time points of driving the falling edges of the N second virtual clock signals of the N virtual gate lines are respectively synchronized with driving the other N gates of the plurality of gate lines The other N time points of the rising edge of the clock signal. Moreover, in accordance with an embodiment of the present invention, the other N of the clock signals are switched during the touch to N signals of the first N gate lines that are driven after the display period.

The present invention also provides a method for driving an in-cell touch display panel, comprising: driving the in-cell touch display panel alternately during a display period and a touch period during any frame period; a first set of time points during a frame period driving the in-cell touch display panel to enter the touch period; and a second set of time points in a second frame period subsequent to the first frame Driving the in-cell touch display panel into the touch period, wherein the first set of time points is different from the second set of time points.

According to an embodiment of the invention, the in-cell touch display panel In the driving method, the second group of time points is randomly selected.

The present invention also provides a method for driving an in-cell touch display panel, wherein the in-cell touch display panel includes: a plurality of pixels disposed on the in-cell touch display panel; and a plurality of gate lines, Each of the pixels connected to each of the columns; and the N virtual gate lines are not connected to any of the pixels, wherein N is greater than or equal to 1. The driving method of the in-cell touch display panel comprises: the in-cell touch The display panel is alternately driven during a display period and a touch period; during the display period, the plurality of gate lines are driven by the plurality of clock signals to send a scan signal column by column; before entering the touch period during the display period, Driving the N virtual gate lines with N virtual clock signals to send a virtual scan signal column by column, where N is greater than or equal to 1; and synchronizing the time points of the rising edges of the N virtual clock signals to the driving a time point of the falling edges of the N clock signals of the N gate lines in the plurality of gate lines.

According to an embodiment of the present invention, in the driving method of the in-cell touch display panel, the N clock signals are switched during the display period to N of the N gate lines that are last driven before the touch period. signal.

According to another embodiment of the present invention, the driving method of the in-cell touch display panel further includes: after entering the display sensing period during the touch, driving the N virtual signals by the N second virtual clock signals The gate line sends the virtual scan signal column by column; and the time points of the falling edges of the N second virtual clock signals are respectively synchronized with the other N driving the other N gate lines of the plurality of gate lines The time point of the rising edge of the clock signal. Moreover, in accordance with an embodiment of the present invention, the other N of the clock signals are switched during the touch to N signals of the first N gate lines that are driven after the display period.

With the above in-cell touch display panel and its driving method, It can improve the problem of colored spots on the boundary of the area in the conventional in-cell touch display panel.

10, 20, 30‧‧‧Inline touch display panel

11, 21, 31‧‧‧ display area

D1, D2, D3, D4‧‧‧ data lines

G1, G2, G3, G13~G46‧‧‧ gate line

DG1, DG2, DG3, DG4‧‧‧ virtual gate line

P11, P12, P13, P21, P22, P23‧‧ ‧ pixels

R1, R2, Rn-1, Rn‧‧‧ areas

A, B‧‧‧ scan direction

CK‧‧‧ clock signal input

CK1~CK12‧‧‧ clock signal

C1‧‧‧ capacitor

OUT_M-1‧‧‧Upper level signal input

OUT_M‧‧‧ output

P‧‧‧ node

Q‧‧‧Control terminal

S1, S2, ..., Sk+1, ..., Sm‧‧‧ common electrode blocks

SF_M‧‧‧M-level shift register

T1, T2, T3‧‧‧ transistors

T‧‧‧ time

T1, t2, t3, t4, t5‧‧‧ first group of time points

T1a, t2a, t3a, t4a, t5a‧‧‧ second group of time points

T1b, t2b, t3b, t4b, t5b‧‧‧ third group of time points

TID1, TID2, TID3, TID4, TID5‧‧‧ touch drive period

VGL‧‧‧ low voltage node

Vcom‧‧‧Common electrode voltage

W1, W2, ..., Wk+1, ..., Wm‧‧‧ metal wires

Figure 1 is a schematic top view showing a conventional in-cell touch display panel.

Figure 2 is a schematic diagram showing the embedded touch display panel for partition driving.

Figure 3 is a circuit diagram showing a shift register in an amorphous germanium integrated gate drive circuit.

Fig. 4 is a waveform diagram of potentials of respective nodes of the shift register shown in Fig. 3.

FIG. 5 is a waveform diagram of potentials of respective nodes when the shift register shown in FIG. 3 is used for partition driving of the embedded touch display panel.

6A to 6C are views showing a part of the circuit configuration of the shift register of the third embodiment of the present invention.

FIG. 6D is a diagram showing an improved waveform of each node potential when the shift register of the embodiment of the present invention is used for partition driving of the embedded touch display panel.

Fig. 7 is a view showing a time point at which the touch change driving is changed between the two frames of the present invention.

Fig. 8 is a view showing a time point at which the touch driving is changed between a plurality of frames of the present invention.

Fig. 9 is a view showing a timing of outputting a clock signal of an embedded touch display panel and a state of coupling to a common electrode.

FIG. 10 is a schematic diagram of an in-cell touch display panel according to an embodiment of the invention.

11 is a schematic view showing a timing of outputting a clock signal of an in-cell touch display panel and a state of coupling to a common electrode according to an embodiment of the invention.

Figure 12 is a diagram of a driving scan mode in accordance with one embodiment of the present invention.

Hereinafter, the touch display panel of the present invention and a display method thereof will be described based on the drawings. The same reference numerals are given to the same elements in the different drawings and the corresponding description, and the repeated description is omitted.

Figure 2 is a schematic diagram showing the embedded touch display panel for partition driving. It is assumed that the display area of the embedded touch display panel is divided into a plurality of (for example, n) areas R1, R2, ..., Rn-1, Rn in the row direction, and the driving manner of the embedded touch display panel 10 is as shown in FIG. First, the display driving is performed on the region R1, and the scanning signal is sent to the gate line in the region R1. After the completion, the touch driving is performed on the region R1, and it is determined whether the common electrode block in the sensing region R1 is touched; The display driving is performed on the next area R2, and then the touch driving is performed on the area R2, and so on, until the area Rn completes the display driving and the touch driving. The period T of the display drive and the touch drive is completed in all regions, which is equivalent to a complete frame period. When the display driving frequency of the in-cell touch display panel 10 is 60 Hz, T is 16.6 ms.

Figure 3 is a circuit diagram showing a shift register in an amorphous germanium integrated gate drive circuit. Fig. 4 is a waveform diagram of potentials of respective nodes of the shift register shown in Fig. 3. Assume that the basic structure of an M-th stage shift register SF_M includes three transistors T1, T2, T3 and one capacitor C1, wherein the transistor T1 is connected between the clock signal input terminal CK and the output terminal Out_M, and is controlled. The terminal is connected to the point P for outputting a scan during the selection of the Mth column gate line to which the Mth stage shift register SF_M is connected signal. The transistor T2 is connected as a diode and is connected between the signal input terminal Out_M-1 of the upper stage and the node P. The transistor T3 is connected between the node P and a low voltage node VGL, and a control terminal Q controls when the voltage of the node P is pulled down to the potential level provided by the low voltage node VGL (as shown in FIG. 4, Usually a negative voltage). The capacitor C1 is connected between the node P and the output terminal Out_M. In the case of non-sub-regional scanning, the waveform of each node is as shown in FIG. 4, and the potential of the node P is sequentially input with the signals of the upper-stage signal input terminal Out_M-1 and the clock signal input terminal CK, and gradually Raise the level and let the output Out_M send a pulsed scan signal.

However, when the shift register of FIG. 3 is the first gate line for one of the area driving of the touch display panel, the potential waveform of each node is as shown in FIG. 5. When the last gate line of the previous region completes the display driving, the signal is input to the upper signal input terminal Out_M-1 of the first shift register SF_M of the region, and then enters the touch driving of the previous region. Since the GOP circuit does not output the scan signal during the touch driving, the clock signal is input to the clock signal input terminal CK after the touch control of the previous region is completed. In this way, the interval between the voltage input to the signal input terminal Out_M-1 of the upper stage and the voltage input from the clock signal input terminal CK is often too long, so that the potential of the node P drops due to leakage. If the potential of the node P drops too low, when the pulse signal is input to the clock signal input terminal CK, the transistor T1 cannot be completely turned on, and the scan signal cannot be sent out to the output terminal Out_M.

In order to solve the problem that the above-mentioned gate signal cannot be transmitted, the present invention provides the following solutions: (1) increasing the capacitance value of the capacitor C1 to slow the leakage of the node P; (2) changing the transistors T2 and T3 into In series, increasing the voltage or impedance of the transistors T2 and T3, so that the leakage current is small, and the transistor T2 is changed into a series connection. As in the two forms of Figures 6A, 6B, the transistor T3 is changed to a series implementation such as the form of Figure 6C. In Figures 6A to 6C, only two examples of series connection of transistors are shown, but the number of transistors in series may be two or more; (3) increasing the channel length of the transistors T2 and T3, and also increasing the transistor T2. The voltage or impedance of T3 makes the leakage current smaller; (4) The signal input terminal Out_M-1 of the transistor T2 is changed to the high voltage level to maintain the node P at a fixed level; (5) During the touch driving, the voltage of the low voltage node VGL is raised to, for example, 0V. Specifically, for example, the waveform diagram of each node shown in FIG. 6D, when the voltage of the low voltage node VGL is increased from a negative voltage during the touch driving period. At 0 V, the voltage difference between the node P and the low voltage node VGL can be reduced, and the leakage of the node P is slowed down (a voltage waveform of a broken line as shown in the node P is generated).

On the other hand, the driving method of the in-cell touch display panel can be directly changed, and the partition driving is not performed, and the entire display area is displayed and driven, and then the touch driving is performed. The time of the touch drive is arranged during the blank period between the frame and the frame to avoid display driving interruption between the area and the area.

In addition, another problem can be found from Fig. 6, even if the scan signal can be output from the output terminal Out_M, the rising edge and the falling edge of the pulse are inclined, which affects the voltage of the written pixel (especially the scanning signal). The falling edge of the pulse has a greater effect, and the display of the pixel column is abnormal. This is also the problem of staining at the boundary of the area mentioned in the prior art.

In order to solve the above problem of boundary color spots caused by abnormal waveforms of the scanning signals, the present invention provides the following two solutions: (1) increasing the width-to-length ratio of the transistor T1 in the shift register SF_M located at the boundary of the region In this way, the driving capability of the transistor T1 can be increased, and the pulse waveform of the scanning signal outputted by the output terminal Out_M of the shift register SF_M can be improved; (2) the in-cell touch is constantly changed. When the panel enters the touch driving time, the condition of the boundary stain is uniformized for the entire display, and the human eye cannot observe the uneven spot at a specific position.

Fig. 7 is a view showing a time point at which the touch change driving is changed between the two frames of the present invention. As shown in Fig. 7, it is assumed that 12 clock signals CK1~CK12 are sequentially input to the shift register of each stage, so that the shift register of each stage sequentially sends the gate signals of 12 gate lines. In the frame n, during the display driving period, the clock signals CK1 to CK12 respectively cause the shift register to send the scan signals of the gate lines G13 to G24, and then enter the touch driving period, after the touch driving period ends, the time is The pulse signals CK1~CK12 respectively cause the shift register to send the scan signals of the gate lines G25~G36. However, in the next frame n+1, the clock signals CK1~CK12 cause the shift register to send the scan signals of the gate lines G13~G26 before entering the touch drive period, after the end of the touch drive period, the clock The signals CK1~CK12 respectively cause the shift register to send the scan signals of the gate lines G27~G36. It can be seen from Fig. 7 that in the frame n is the period of entering the touch driving after the gate line G24 is scanned, and in the next frame n+1, the scanning is started after the gate line G26 is scanned. Period. The period of the touch drive can be shifted back and forth by adjusting the number of columns scanned by the display drive interval.

Fig. 8 is a view showing a time point at which the touch driving is changed between a plurality of frames of the present invention. It is assumed that during one frame period T, five touch driving periods TID1, TID2, TID3, TID4, and TID5 are entered. During the five touch driving periods, TID1, TID2, TID3, TID4, and TID5 occur in frame n at the first set of time points t1, t2, t3, t4, and t5; in frame n+a, The second set of time points t1a, t2a, t3a, t4a, t5a; occurs in frame n+b with the third set of time points t1b, t2b, t3b, t4b, t5b. Since the time points in each frame are staggered, the phenomenon of edge stains can be evenly distributed into the picture, making it difficult for the human eye to observe. come out. Moreover, the time points of entering the touch driving periods TID1, TID2, TID3, TID4, and TID5 in each frame can be randomly selected.

Fig. 9 is a view showing a timing of outputting a clock signal of an embedded touch display panel and a state of coupling to a common electrode. During the display driving period, the rising edge and the falling edge of each of the clock signals CK1 to CK12 cause coupling to the voltage Vcom of the common electrode of the panel (whether the common electrode is formed on the TFT side or the color filter side). In the normal state, each falling edge of the clock signal overlaps with the rising edge of the other clock signal, so the voltage coupling to the common electrode cancels each other out. However, when the display driver switches to the boundary of the touch driver, as shown in FIG. 9, the falling edge of the pulse of the last four clock signals CK9~CK12 before entering the touch drive is not offset, and The voltage across the common electrode produces a downward bounce. The same situation occurs when the touch drive is switched to the boundary of the display driver, and the rising edge of the pulse of the first four clock signals CK1 to CK4 after the display drive is not canceled, so that the voltage of the common electrode is generated. Jumping upwards. The voltage jump of the common electrode causes a change in the cross-pressure of the liquid crystal, which also produces a color spot on the boundary of the region.

In order to solve the above problems, the present invention provides a virtual gate line transmission signal to balance the voltage jitter of the above-described common electrode. FIG. 10 is a schematic diagram of an in-cell touch display panel according to an embodiment of the invention. The display area 21 of the in-cell touch panel 20 includes a plurality of gate lines G1, G2, ... parallel to the column direction; a plurality of data lines D1, D2, D3, D4, ... parallel to the row direction; a plurality of pixels P11, P21, P12, P22, P13, P23, ... at the intersection of the gate line and each data line; and at least one (four in this embodiment) virtual gate lines parallel to the column direction DG1, DG2, DG3, DG4. Virtual gate line DG1, DG2 DG3 and DG4 will send the scan signals when the virtual clock signals C1, C2, C3, and C4 are input, respectively, but the virtual gate lines DG1, DG2, DG3, and DG4 are not connected to any of the pixels. In FIG. 10, the dummy gate lines DG1, DG2, DG3, and DG4 are disposed below the display region 21, but the dummy gate lines DG1, DG2, DG3, and the like, do not affect the aperture ratio of the display region as much as possible. The DG4 can be placed anywhere on the panel or outside the display area 21.

The driving timings of the virtual gate lines DG1, DG2, DG3, and DG4 are as shown in FIG. 11. Before the display drive enters the touch driving, the time point of the rising edge of the virtual clock signal C1 falls on the falling of the clock signal CK9. The time point of the edge; the time point of the rising edge of the virtual clock signal C2 will fall at the time point of the falling edge of the clock signal CK10; the time point of the rising edge of the virtual clock signal C3 will fall on the falling of the clock signal CK11 The time point of the edge; the time point of the rising edge of the virtual clock signal C4 will fall at the time point of the falling edge of the clock signal CK12. In this way, due to entering the falling edge of the pulse of the last four clock signals CK9~CK12 before the touch driving, and four virtual clock signals for driving the virtual gate lines DG1, DG2, DG3, DG4 The time points of the rising edges of C1~C4 overlap, so the voltage coupling to the common electrodes cancels each other, and the voltage Vcom of the common electrode does not jump when switching from the display driving to the touch driving, thereby solving the problem of the color spot.

Similarly, after the touch driving enters the display driving, the time point of the falling edge of the virtual clock signal C1 will fall at the time point of the rising edge of the clock signal CK1; the time point of the falling edge of the virtual clock signal C2 will fall. At the time point of the rising edge of the clock signal CK2; the time point of the falling edge of the virtual clock signal C3 will fall at the time point of the rising edge of the clock signal CK3; the time point of the falling edge of the virtual clock signal C4 will fall At the time point of the rising edge of the clock signal CK4. As a result, The falling edge of the four clock signals C1 to C4 for driving the virtual gate lines DG1, DG2, DG3, and DG4 due to the time point of entering the rising edge of the pulse of the first four clock signals CK1 to CK4 after the display driving The time points overlap, so the voltage coupling to the common electrode cancels each other, and the voltage Vcom of the common electrode does not jump when switching from the touch driving to the display driving, thereby solving the problem of the color spot.

It should be noted that the embodiment of the present invention exemplifies that the four virtual clock signals C1 to C4 respectively drive the virtual gate lines DG1, DG2, DG3, and DG4 to cancel the jitter of the voltage of the common electrode due to the coupling. However, the number of virtual gate lines is not limited, and the number of virtual gate lines is determined according to the number of scan signals corresponding to the pulse width of the clock signals CK1 CK CK12, since one of the clock signals CK1 CK CK 12 in the embodiment There are four scan signal outputs during the pulse period, so the embodiment designs four virtual clock signals to offset. In addition, in this embodiment, the virtual clock signals C1 C C4 are output before the display drive enters the touch drive and after the touch drive enters the display drive, but if the touch drive enters the display drive, the voltage of the common electrode is beaten. The display does not affect the display, and the present invention can also output the virtual clock signal only before the display driver enters the touch drive.

Moreover, the display area of the in-cell touch display panel is divided into only two upper and lower areas, and the problem of the boundary stain can be solved by changing the scanning direction. Figure 12 is a diagram of a driving scan mode in accordance with one embodiment of the present invention. As shown in FIG. 12, the display area 31 of the in-cell touch display panel 30 is divided into two areas R1, R2 for partition driving. When the display is driven, the area R1 is scanned column by column from the center of the screen toward the first direction A (for example, the upper direction) until the edge of the display area, and then enters the touch drive. After the touch drive is completed, the display drive is again entered, from the center of the screen. Scanning the area R2 column by column until the second direction B (for example, the downward direction) until the display The edge of the area is then entered into the touch drive. Since the switching of the display drive to the touch drive occurs after scanning the gate line to the edge of the display area, even if the upper and lower edges of the display area are colored, it is not easily observed. This provides another solution.

Finally, since the in-cell touch display panel must allocate the driving time to the display driving and the touch driving, compared with the ordinary display panel, the display period is compressed, which may cause insufficient charging in the GOP circuit, and the sending is weak. Scan the signal. In this regard, the present invention can adjust the driving frequency of the in-cell touch display panel, for example, reduce the original 60 Hz picture driving frequency to 50 Hz. Thereby the charging time in the GOP circuit is increased.

According to the above embodiments of the present invention, the present invention provides an in-cell touch display panel and a driving method thereof for improving the problem that the above-mentioned signals cannot be continuously transmitted, the color spots are generated at the boundary of the area, and the driving force of the GOP circuit is lowered.

Although the invention has been described in the above embodiments, it is not limited thereto. Further, the scope of the patent application must be broadly construed to include the embodiments of the present invention and other modifications, without departing from the spirit and scope of the invention.

10, 20‧‧‧Inline touch display panel

11, 21‧‧‧ display area

D1, D2, D3, D4‧‧‧ data lines

G1, G2, G3‧‧‧ gate line

DG1, DG2, DG3, DG4‧‧‧ virtual gate line

P11, P12, P13, P21, P22, P23‧‧ ‧ pixels

Claims (9)

An in-cell touch display panel (Touch In Display) panel is alternately driven during a display period and a touch period, and includes: a plurality of pixels disposed on the in-cell touch display panel; and a plurality of gates The polar lines are respectively connected to the pixels of each column, and each of the gate lines is driven by a clock signal to send a scan signal during the display period, and the scanning signal is stopped during the touch; and N virtual The gate line is not connected to any pixel. Before the display period is switched to the touch period, each of the virtual gate lines is driven by a virtual clock signal to send a virtual scan signal, where N is greater than or equal to 1, The time points of the rising edges of the N virtual clock signals driving the N virtual gate lines are respectively synchronized with the falling of the N clock signals driving the N gate lines of the plurality of gate lines The point in time of the edge. The in-cell touch display panel of claim 1, wherein the N clock signals are switched during the display period to N signals of the N gate lines that are last driven before the touch period. The in-cell touch display panel of claim 1 or 2, wherein each of the N virtual gate lines is switched to the display period during the touch period, and is subjected to a second dummy time. The pulse signal is driven to send the virtual scan signal, wherein time points of driving the falling edges of the N second virtual clock signals of the N virtual gate lines are respectively synchronized with driving the plurality of gate lines The other N times of the N gate lines are the time points of the rising edge of the clock signal. The in-cell touch display panel of claim 3, wherein the other N of the clock signals are switched during the touch period to the N of the N gate lines that are driven first after the display period. Signals. A driving method of an in-cell touch display panel includes: driving the in-cell touch display panel alternately during a display period and a touch period during any frame period; during a first frame period a first set of time points driving the in-cell touch display panel into the touch period; and a second set of time points in a second frame period subsequent to the first frame driving the inline The touch display panel enters the touch period, wherein the first set of time points is different from the second set of time points, and the second set of time points is randomly selected. A driving method of an in-cell touch display panel, wherein the in-cell touch display panel comprises: a plurality of pixels disposed on the in-cell touch display panel; and a plurality of gate lines connected to each a column of pixels; and N virtual gate lines, not connected to any pixel, wherein N is greater than or equal to 1, the driving method of the in-cell touch display panel comprises: alternately the in-cell touch display panel Driving during a display period and during a touch period; During the display period, the plurality of gate lines are driven by the plurality of clock signals to send a scan signal column by column; and the N virtual gate lines are driven by N virtual clock signals before entering the touch period during the display period. Sending a virtual scan signal column by column, wherein N is greater than or equal to 1; and synchronizing the time points of the rising edges of the N virtual clock signals to N driving N gate lines in the plurality of gate lines respectively The point in time at which the falling edge of the clock signal. The driving method of the in-cell touch display panel according to claim 6, wherein the N clock signals are switched during the display period to the N gate lines that are last driven before the touch period. N signals. The driving method of the in-cell touch display panel as described in claim 6 or 7, further comprising: driving the N second virtual clock signals after entering the display sensing period during the touch period The N virtual gate lines respectively send the virtual scan signal; and the time points of the falling edges of the N second virtual clock signals are respectively synchronized to drive the other N gates of the plurality of gate lines The other N time points of the rising edge of the clock signal. The driving method of the in-cell touch display panel according to claim 8, wherein the other N clock signals are switched to the first N gates that are driven after the display period during the touch period. N signals of the line.