TWI678654B - Touch display device and touch driving method - Google Patents

Abstract

A touch driving method includes: detecting a synchronization signal from a display driving system; detecting an interference signal from the touch display panel, wherein the interference signal includes a plurality of interference pulses; and according to the synchronization signal and the multiple Interference pulses, generating multiple trigger pulses within a fixed period of the synchronization signal; and generating multiple touch driving pulses according to the multiple trigger pulses.

Description

Touch display device and touch driving method

The present disclosure relates to a touch driving method, and more particularly to a touch driving method with anti-noise function.

With the development of touch display devices, manufacturing has mostly integrated a liquid crystal display panel for displaying a picture and a touch panel for sensing touch.

However, due to the integration of the liquid crystal display panel and the touch panel, noise generated when the liquid crystal display panel displays a specific pattern will affect the touch signal of the touch panel.

Therefore, how to prevent the touch panel from being disturbed by noise from the liquid crystal display panel is a major issue today.

One aspect of the present disclosure is to provide a touch driving method including: detecting a synchronization signal from a display driving system; detecting an interference signal from the touch display panel, wherein the interference signal includes a plurality of interference pulses. ; According to the synchronization signal and the plurality of interference pulses, in Multiple trigger pulses are generated within a fixed period of the synchronization signal; and multiple touch drive pulses are generated according to the multiple trigger pulses.

Another aspect of the present disclosure is to provide a touch display device. The touch display device includes a touch display panel, a display driving circuit, a timing control unit, a touch driving unit, and a touch control unit. The timing control unit is used to provide a synchronization signal to the display driving circuit. The touch control unit is coupled to the timing control unit, and the touch control unit is configured to perform the following steps: detecting the synchronization signal; detecting an interference signal from the touch display panel, and the interference signal Including a plurality of interference pulses; estimating a delay time, the delay time corresponding to a time interval between the synchronization signal and one of the plurality of interference pulses; and based on the synchronization signal and the delay time, in the synchronization signal A plurality of trigger pulses are generated within a fixed period of time; a plurality of touch driving pulses corresponding to the plurality of trigger pulses are output to the touch display panel. The touch drive unit is coupled to the touch control unit, and the touch drive unit is configured to generate the plurality of touch drive pulses according to the plurality of trigger pulses.

Through the above arrangement, the present disclosure can prevent the noise from the display panel from affecting the touch operation while integrating the display panel and the touch panel.

This disclosure is intended to provide a simplified summary of this disclosure so that readers may have a basic understanding of this disclosure, and is not intended to point out important elements of the embodiments of this disclosure or to define the scope of this disclosure.

In order to make the above and other objects, features, advantages, and embodiments of the present disclosure more comprehensible, the description of the attached symbols is as follows:

100‧‧‧ touch display device

110‧‧‧touch control unit

120‧‧‧Touch Drive Unit

130‧‧‧sequence control unit

140‧‧‧Touch display panel

150‧‧‧display driving circuit

300‧‧‧ Touch Drive Method

Stou‧‧‧Touch Drive Signal

Ssync‧‧‧Sync signal

Stri‧‧‧Trigger signal

Sn‧‧‧ interference signal

Sd‧‧‧Data activation signal

Ssync, P11, P12, P13‧‧‧Sync pulse

Ptou, P411, P421, P431, P432, P433‧‧‧touch driving pulse

Ptri, P311, P321, P331, P332, P333‧‧‧Trigger pulse

Pn, P211, P212, P213, P221, P222, P223, P231, P232, P233‧‧‧Interference pulse

L1, L11, L12, L13‧‧‧No-noise interval length

L2‧‧‧pulse length

d, d1, d2, d3‧‧‧ delay time

TP1, TP2 ‧‧‧ cycles

S310-S340, S410-S470, S620-S670‧‧‧ steps

In order to make the above and other objects, features, advantages, and embodiments of the present invention more comprehensible, the description of the drawings is as follows: FIG. 1 illustrates a touch display device according to an embodiment of the present disclosure. Block diagram; FIG. 2 is a functional block diagram of a touch display device according to an embodiment of the present disclosure; FIG. 3 is a diagram of a touch display device of FIG. 1 according to an embodiment of the present disclosure; FIG. 4 is a flowchart of a touch driving method according to an embodiment of the present disclosure; FIG. 4 is a partial flowchart of the touch driving method of FIG. 3 according to an embodiment of the present disclosure; FIG. FIG. 4 is a timing diagram of the touch driving method in FIG. 4; FIG. 6 is a partial flowchart of the touch driving method in FIG. 3 according to an embodiment of the present disclosure; and FIG. An illustrative example of the touch driving method in FIG. 6 is shown in the embodiment.

The following is a detailed description with examples and the accompanying drawings, but the examples provided are not intended to limit the scope covered by this disclosure, and the description of the structure operation is not used to limit the order of its implementation, and any recombination of components The structure and the devices with the same effect are all the scope covered by this disclosure. In addition, the drawings are for illustrative purposes only, and are not drawn to the original dimensions. To facilitate understanding, the same or similar elements in the following description It will be explained with the same symbol.

Regarding the "first", "second", ..., etc. used in this document, they do not specifically refer to the order or order, nor are they used to limit the present invention. They are only used to distinguish elements or operations described in the same technical terms. That's it.

As used herein, "coupling" or "connection" can mean that two or more components make direct physical or electrical contact with each other, or indirectly make physical or electrical contact with each other, and "coupling" or " "Connected" may also mean that two or more elements operate or act on each other.

FIG. 1 is a schematic diagram of a touch display device 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the touch display device 100 includes a touch control unit 110, a touch drive unit 120, a timing control unit 130, a touch display panel 140, and a display drive circuit 150. The touch control unit 110 is coupled to The touch driving unit 120 and the timing control unit 130, the touch driving unit 120 is further coupled to the timing control unit 130 and the touch display panel 140, the timing control unit 130 is further coupled to the display driving circuit 150, and the touch display panel 140 is more Coupled to the display driving circuit 150.

In some embodiments, the touch display panel 140 includes a touch panel and a display panel, wherein the display panel is used to display an image frame, and the touch panel is used to generate a voltage change according to the touch position to achieve a touch operation. In some embodiments, the touch display panel 140 may be a touch display panel with an in-cell touch panel, that is, the touch elements are integrated in the display panel, and the touch operation is achieved through timing control. And screen display operation. In some embodiments, the touch elements of the in-cell touch panel are disposed on the display. On an array substrate in the panel.

In some embodiments, the touch driving unit 120 is configured to generate a plurality of touch driving pulses Ptou and transmit the plurality of touch driving pulses to the touch display panel 140 to determine whether the touch display panel 140 is touched by a conductor. . In some embodiments, the touch driving unit 120 may be implemented as a touch IC. In some embodiments, the touch control unit 110, the touch drive unit 120, and the timing control unit 130 may be implemented as an integrated chip.

In some embodiments, the timing control unit 130 is used to control the operations of the touch driving unit 120 and the display driving circuit 150. In some embodiments, the timing control unit 130 may be implemented as a timing controller.

In some embodiments, the display driving circuit 150 is used to drive the touch display panel 140 to generate a corresponding picture. In some embodiments, the display driving circuit 150 may be implemented as a source driver and a gate driver disposed on one or both sides of the touch display panel 140. In another embodiment, the display driving circuit 150 may be implemented as a source driver disposed on one side of the touch display panel 140. The gate driver may be disposed on the array substrate around the touch display panel 140.

In some embodiments, the touch control unit 110 is used to detect the synchronization signal from the timing control unit 130, detect the interference signal from the touch display panel 140, and estimate the delay time corresponding to the synchronization signal and the interference signal. The signal and delay time generate multiple trigger pulses within a fixed period of the synchronization signal, and output multiple touch drivers corresponding to multiple trigger pulses Pulse Ptou to the touch display panel 140.

In some embodiments, the signal transmission between various elements in the touch display device 100 shown in FIG. 1 is as shown in FIG. 2, which is a diagram illustrating a touch according to an embodiment of the present disclosure. A functional block diagram of the display device 100.

As shown in FIG. 2, in some embodiments, each row of the touch display panel 140 includes red pixels (R), green pixels (G), and blue pixels (B). The high voltage level and the low voltage level are alternately connected, and two pixels adjacent to each row of pixels are connected to the high voltage level and the low voltage level, respectively. In other words, the pixel arrangement of the touch display panel 140 is a tri-gate pixel structure, a column inversion setting, and a zigzag pixel layout. .

As shown in FIG. 2, when the pixels in the vertical row direction displayed by the touch display panel 140 have the same color, that is, when the touch display panel 140 displays a vertical stripe (V-stripe) pattern, the touch display panel 140 will generate The largest noise, which greatly affects the transmission and reception of touch signals, however, any pattern displayed on the touch display panel 140 will generate noise of different amplitudes, so various patterns are protected by this disclosure. Within range.

As shown in FIG. 2, each row of pixels in the touch display panel 140 is connected to the gate lines G1 to G6, and each row of pixels in the touch display panel 140 is connected to the signal lines S1 to S7.

As shown in FIG. 2, the timing control unit 130 provides a synchronization signal Ssnyc to the touch control unit 110 and the touch driving unit 120, wherein the synchronization signal Ssync includes a horizontal synchronization signal (Hsync) and a vertical synchronization signal. (Vsync). In the following embodiments, the horizontal synchronization signal Hsync is taken as an example for description.

As shown in FIG. 2, the display driving circuit 150 is disposed on both sides of the touch display panel 140 to provide a driving display signal to the touch display panel 140 so that the touch display panel 140 displays a corresponding image frame.

In some embodiments, the touch driving unit 120 is configured to generate a touch driving pulse Ptou to the touch input driving terminal TX of the touch display panel 140, and receive the touch from the touch display panel 140 through the touch driving unit 120. Input the signal of RX on the sensing end.

In some embodiments, the touch control unit 110 is configured to detect a synchronization signal Ssync from the timing control unit 130; detect an interference signal Sn from the touch drive unit 120; detect a delay time d required for touch; and A plurality of trigger pulses Ptri are generated and output to the touch driving unit 120 according to the interference signal Sn and the delay time d.

The detailed implementation method of the present disclosure is described in the following paragraphs with reference to the touch driving method in FIG. 3, where FIG. 3 illustrates the touch of the touch display device 100 in FIG. 1 according to an embodiment of the present disclosure. Flow chart of the control driving method 300. However, the present disclosure is not limited to the embodiments described below.

It should be noted that the touch driving method 300 can be applied to a touch display device 100 having the same or similar structure as that shown in FIG. 1. In order to make the description simple, the following describes the operation method by taking the touch display device 100 in FIG. 1 as an example according to an embodiment of the present invention, but the present invention is not limited to this application.

Referring to FIG. 2 and FIG. 3 together, the touch driving method 300 includes the following steps.

In step S310, the touch control unit 110 detects a synchronization signal Ssync from the timing control unit 130.

In step S320, the touch driving unit 120 detects an interference signal Sn from the touch display panel 140 and transmits it to the touch control unit 110. The interference signal Sn includes a plurality of interference pulses Pn. In some embodiments, the interference signal Sn can be obtained by analyzing the signal from the touch input sensing terminal RX of the touch display panel 140.

In step S330, the touch control unit 110 generates a plurality of trigger pulses Ptri within a fixed period of the synchronization signal Ssync and transmits them to the touch driving unit 120 according to the synchronization signal Ssync and the plurality of interference pulses Pn.

In step S340, the touch driving unit 120 generates a plurality of touch driving pulses Ptou according to the plurality of trigger pulses Ptri and transmits the touch driving pulses Ptou to the touch display panel 140 to control the touch time.

Refer to Figure 4 and Figure 5 together. FIG. 4 is a further detailed flowchart of the touch driving method 300 in FIG. 3 according to some embodiments of the present disclosure, wherein step S320 in FIG. 3 includes step S410 and step S330 further includes steps S420 to S460. FIG. 5 is a timing diagram of the touch driving method 300 in FIG. 4 according to an embodiment of the present disclosure.

In step S410, the touch driving unit 120 detects whether the touch input sensing terminal RX of the touch driving unit 120 has an interference signal Sn. In this step, the interference signal Sn may be detected by detecting a touch input. According to the analysis of the change of the RX signal, the touch driving unit 120 further transmits the interference signal Sn to the touch control unit 110.

In some embodiments, if the touch control unit 110 determines that the touch input sensing terminal RX of the touch driving unit 120 has an interference signal Sn, step S420 is performed. If the touch control unit 110 determines that there is no interference signal Sn at the touch input sensing terminal RX of the touch drive unit 120, step S470 is executed, the touch control unit 110 generates a trigger pulse Ptri according to the synchronization signal Ssync, and the touch drive unit 120 The touch driving pulse Ptou is generated according to the trigger pulse Ptri.

In step S420, a delay time is set. In some embodiments, the delay time set in step S420 is an initial delay time d1 (as shown in FIG. 5). For example, the initial delay time can be set in step S420. The time d1 is set to 1 ms.

In step S430, the touch control unit 110 generates a trigger pulse P311 according to the synchronization pulse Ssync and the initial delay time d1. Taking FIG. 5 as an example, the starting point of the trigger pulse P311 is the synchronization pulse P11 plus the delay time d1. And step S430 generates a touch driving pulse P411 corresponding to the trigger pulse P311. In this embodiment, the starting point of the touch drive pulse P411 is determined by the time point of the trigger pulse P311, and the duration of the touch drive pulse P411 is the time required for the touch drive unit 120 to complete a touch detection. And decide. If the time required for the touch driving unit 120 to complete one touch detection is shorter, the duration of the touch driving pulse P411 is shorter.

In step S440, the touch control unit 110 detects a touch Whether the duration of the driving pulse P411 is affected by the interference signal Sn. If the touch control unit 110 determines that it is affected by the interference signal Sn during the touch drive pulse P411, taking FIG. 5 as an example, the touch control unit 110 determines that the interference pulse P211 is affected by the interference signal Sn during the touch drive pulse P411. If it is affected, step S450 is executed to calculate a new delay time d and generate another trigger pulse Ptri and corresponding touch driving pulse Ptou accordingly. In an embodiment, the calculation of the new delay time d is to increase the delay time, that is, the new delay time d2 may be the previous delay time d1 plus a certain time difference. For example, the current delay time d1 (1ms) plus a certain time difference (1ms) can be equal to the new delay time d2 (2ms). It should be noted that the above-mentioned delay time d1, delay time d2 and the value of the time difference Just for convenience of illustration, the present disclosure is not limited to the above time value, and the value of the delay time can be adjusted according to the requirements of actual applications.

After calculating the new delay time d2, step S450 will generate a new touch driving pulse P321 when the next synchronization pulse P12 arrives according to the new delay time d2. The starting point of the touch driving pulse P321 is the synchronization pulse P12 plus The delay time d2, and step S450 will generate a touch driving pulse P421 corresponding to the touch driving pulse P321, as shown in FIG. 4 and FIG. 5. In this embodiment, the starting point of the touch driving pulse P421 is The time point of the trigger pulse P321 is determined, and the duration of the touch driving pulse P421 is determined by the time required for the touch driving unit 120 to complete one touch detection. At this time, step S440 is executed again to determine whether the touch driving pulse P421 is interfered by the interference signal Sn in the meantime.

Taking FIG. 5 as an example, the touch control unit 110 determines that it is still affected by the interference pulse P221 of the interference signal Sn during the touch driving pulse P421, and then executes step S450 again, calculates a new delay time d again, and generates accordingly Another trigger pulse Ptri and corresponding touch driving pulse Ptou. At this time, the new delay time d3 calculated in step S450 may be the previous delay time d2 plus a certain time difference. For example, the current delay time d2 (2ms) plus a certain time difference (1ms) is equal to the new Delay time d3 (3ms). After the new delay time d3 is calculated, step S450 will generate a new touch drive pulse P331 when the next synchronization pulse P13 arrives according to the new delay time d3. The starting point of the touch drive pulse P331 is the synchronization pulse P13 plus The delay time d3, and step S450 will generate a touch driving pulse P431 corresponding to the touch driving pulse P331.

As shown in Figure 4 and Figure 5. At this time, step S440 is executed again to determine whether the touch driving pulse P431 is interfered by the interference signal Sn in the meantime. At this time, the touch control unit 110 determines that it is not affected by the interference signal Sn during the touch drive pulse P431. Taking FIG. 5 as an example, the touch control unit 110 determines that the interference signal Sn is not affected during the touch drive pulse P431. If the influence of the interference pulses P231, P232 or other interference pulses, step S460 is performed.

In some embodiments, in step S460, the touch control unit 110 generates consecutive trigger pulses Ptri according to the time point of the trigger pulse Ptri and the equal inter-zone length of the fixed period TP1 of the synchronization signal Ssync. Taking FIG. 5 as an example, the touch control unit 110 divides the fixed period TP1 into The length between three equal divisions, so three trigger pulses P331, P332 and P333 are generated. The trigger pulses P331, P332 and P333 are spaced from each other by a third of a fixed period TP1.

The length between equal partitions can be regarded as three equal parts of the fixed period TP1 of the synchronization signal Ssync (that is, one third of the fixed period TP1). In another embodiment, the data can be equally divided according to a fixed period of the data activation signal Sd. That is, the equal interval length between the trigger pulses P331, P332, and P333 can be set as the data activation signal Sd. One third of the fixed period TP2.

In this way, the touch control unit 110 transmits trigger pulses P331, P332, and P333 to the touch drive unit 120, and the touch drive unit 120 generates touch pulses P431, P432, and P433 according to the trigger pulses P331, P332, and P333, so that the touch The time period for controlling the display device 100 to receive the touch driving signal Stou is not affected by the noise generated by displaying the specific pattern.

In the above embodiment, the touch control unit 110 generates three sets of trigger pulses P331, P332, and P333 as examples, but this disclosure is not limited thereto. In other embodiments, in order to further increase the return rate of the touch control unit 110 (ie, shorten the scanning interval), the number of trigger pulses (for example, four or more times) can be increased, as long as the noise on the driving signal Stou can be avoided That is, the return rate of the touch control unit 110 can be further improved without being affected by noise. In other embodiments, if the touch control unit 110 does not need a high return rate, it can also generate only one or two trigger pulses in a fixed period TP1 of a synchronization signal Ssync.

FIG. 6 is a further detailed flowchart of the touch driving method 300 in FIG. 3 according to some embodiments of the present disclosure. Among them, the driving method 300 shown in FIG. 6 and the driving method 300 shown in FIG. The difference is that step S330 in FIG. 6 includes steps S620 to S670.

Since steps S310, S410, S420, S340, and S470 shown in FIG. 6 have been described in FIGS. 3 and 4, they are not described again here.

Referring to FIG. 6 and FIG. 7 together, FIG. 7 is an illustrative example of the touch driving method 300 in FIG. 6 according to an embodiment of the present disclosure.

In step S620, a delay time is set. In some embodiments, the delay time set in step S620 is an initial delay time d1 (as shown in FIG. 7). For example, the initial delay time can be set in step S620. The time d1 is set to 1 ms.

In step S630, the touch control unit 110 generates a trigger pulse P311 according to the synchronization pulse P11 and the initial delay time d1. Taking FIG. 5 as an example, the starting point of the trigger pulse P311 is the synchronization pulse P11 plus the delay time d1.

In step S640, the touch control unit 110 estimates a noise-free interval (or from the starting point of the trigger pulse P311 to any of the subsequent interference pulses Pn (the interference pulse P211 in the embodiment in FIG. 7)). Is the low noise interval) length L11.

Next, step S650 is executed, and the touch control unit 110 determines whether the length L11 of the noise-free interval (or low-noise interval) of the trigger pulse P311 is greater than the pulse length L2 of the touch driving pulse P411.

At this time, the length L11 of the noise-free interval (or low-noise interval) of the trigger pulse P311 is not greater than the pulse length L2 of the touch driving pulse P411.

Therefore, in step S660, the touch control unit 110 calculates a new delay time d2 and generates another corresponding trigger pulse P321 according to the new delay time d2. For details of this step, refer to step S450 in the implementation of FIG. 4 .

Following step S640, the touch control unit 110 estimates a noise-free interval (from the starting point of the trigger pulse P321 to any of the subsequent interference pulses Pn (the interference pulse P221 in the embodiment in FIG. 7)). Or low noise interval) length L12. In step S650, the touch control unit 110 determines that the length L12 of the noise-free interval (or low-noise interval) of the trigger pulse P321 is still shorter than the pulse length L2 of the touch drive pulse P421, so the step S660 is performed again, and the touch control unit 110 calculates a delay time d3 different from the delay time d2, and generates another trigger pulse P331 corresponding to the synchronization pulse P13 according to the delay time d3, and then proceeds to step S640.

In step S640, the touch control unit 110 estimates a noise-free interval (or from the starting point of the trigger pulse P331 to any subsequent interference pulse Pn (the interference pulse P232 in the embodiment in FIG. 7)). Low noise interval) length L13.

In step S650, the touch control unit 110 determines that the length L13 of the noise-free interval (or low-noise interval) of the trigger pulse P331 is greater than the pulse length L2 of the touch drive pulse P431, and then executes step S670, using FIG. 7 as an example. , The touch control unit 110 determines that the noise-free interval length L13 If the pulse length is greater than L2, the touch driving unit 120 is controlled to generate a touch driving pulse P431 in a no-noise interval (or a low noise interval), and subsequently generate touch driving pulses P432 and P433, so that the touch display device 100 receives The period of the touch driving signal Stou is not affected by the noise generated by displaying a specific pattern.

It is worth mentioning that the pulse length L2 may refer to the shortest pulse duration required for the touch driving pulse Ptou generated by the touch driving unit 120. If the duration of the touch driving pulse Ptou is shorter than the pulse length L2, the touch input sensing terminal RX of the touch display panel 140 cannot correctly detect whether there is a touch input or the correct position of the touch input. In one embodiment, the pulse length L2 may be determined according to the size of the touch display panel 140, the touch input resolution, or the touch input update frequency.

In summary, through the above-mentioned setting method, the present disclosure can prevent noise generated by displaying a specific pattern from affecting the touch operation when the touch display device 100 displays a specific pattern.

Although the present disclosure has been disclosed as above by way of implementation, it is not intended to limit the present invention. Any person skilled in the art can make various changes and decorations without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application.

Claims (11)

A touch driving method includes: detecting a synchronization signal from a touch display device, the synchronization signal including a plurality of synchronization pulses; detecting an interference signal from the touch display device, wherein the interference signal includes a plurality of Interference pulses, each synchronization pulse being a delay time from a corresponding one of the interference pulses; at least one trigger pulse is generated within a fixed period of the synchronization signal according to the synchronization signal and the interference pulses; and The at least one trigger pulse generates at least one touch driving pulse. The touch driving method according to item 1 of the scope of patent application, wherein the step of detecting the interference signal from the touch display device includes: detecting a touch input of a touch driving unit of the touch display device. Whether the interference signal exists at the sensing end. The touch driving method according to item 1 of the scope of patent application, wherein a first synchronization pulse and a second synchronization pulse of the synchronization pulses are spaced from each other by the fixed period of the synchronization signal, according to the synchronization signal and the The step of generating the at least one trigger pulse by the interference pulse includes: estimating a first delay time from the first synchronization pulse to any one of the interference pulses; and the step of adding the first delay time according to the first synchronization pulse and the first delay time. A first trigger pulse of the at least one trigger pulse is generated at a time point. The touch driving method according to item 3 of the scope of the patent application, wherein the touch driving method generates a first touch driving pulse according to the first trigger pulse, and the touch driving method further includes: detecting the first touch Control whether the period of the driving pulse is affected by the interference signal; and if the period of the first touch driving pulse is affected by the interference signal, calculate a second delay time different from the first delay time, according to the second delay Time generates another trigger pulse corresponding to the second synchronization pulse. The touch driving method according to item 4 of the scope of patent application, further comprising: if the period of the first touch driving pulse is not affected by the interference signal, according to the time point of the first trigger pulse and one of the fixed period A second trigger pulse and a third trigger pulse of the at least one trigger pulse are generated at equal inter-zone lengths. The touch driving method according to item 3 of the scope of patent application, wherein the step of generating the at least one trigger pulse based on the synchronization signal and the interference pulses includes: activating the signal according to a time point of the first trigger pulse and a data. A first inter-partition length of a switching cycle generates a second trigger pulse and a third trigger pulse of the at least one trigger pulse. The touch driving method according to item 3 of the patent application scope, wherein the touch driving method generates a first touch driving pulse according to the first trigger pulse, and the touch driving method further includes: estimating by the first trigger A noise-free interval length from the start point of the pulse to any of the interference pulses; determining whether the length of the noise-free interval is greater than the pulse length of the first touch driving pulse; and if the noise-free area The length is shorter than the pulse length of the first touch driving pulse, a second delay time different from the first delay time is calculated, and another trigger pulse corresponding to the second synchronization pulse is generated according to the second delay time. The touch driving method according to item 1 of the scope of the patent application, wherein the interference signal is generated when the touch display device displays a V-stripe pattern. The touch driving method according to item 1 of the patent application scope, wherein the touch display device uses a polarity row inversion, a zigzag pixel layout and a tri-gate pixel structure. The touch driving method according to item 1 of the scope of patent application, wherein the synchronization signal is a horizontal synchronization signal (Hsync) generated by a timing control unit of the touch display device. A touch display device includes: a touch display panel; a display driving circuit; a timing control unit for providing a synchronization signal to the display driving circuit; a touch control unit coupled to the timing control unit, the The touch control unit is used to execute: detect the synchronization signal; receive an interference signal from the touch display panel, the interference signal includes a plurality of interference pulses; estimate a delay time, the delay time corresponds to the synchronization signal and A time interval of one of the interference pulses; generating at least one trigger pulse within a fixed period of the synchronization signal according to the synchronization signal and the delay time; and outputting at least one touch drive corresponding to the at least one trigger pulse Pulse to the touch display panel; and a touch driving unit coupled to the touch control unit, and configured to generate the at least one touch driving pulse according to the at least one trigger pulse.