Touch display device and anti-interference method thereof

Abstract

This application relates to the field of display technology and discloses a touch display device and its anti-interference method. The touch display device includes a touch detection circuit and a privacy control circuit; the anti-interference method includes: acquiring a timing reference signal; adjusting the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit according to the timing reference signal, so that the transition time of the privacy control signal is staggered with the touch detection window in time. The embodiments of this application can cut off the coupling interference path from the source; it does not need to disconnect the privacy signal during the window period, thereby avoiding screen flicker caused by sudden changes in the liquid crystal electric field; it does not need to extend the touch cycle or shorten the sampling time, thereby maintaining the original reporting rate and touch accuracy; it does not need to add a shielding layer, and does not change the process and cost; at the same time, it automatically adapts to different display modes with the real-time timing reference signal as a reference, realizing dynamic adaptive anti-interference.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a touch display device and its anti-interference method. Background Technology

[0002] Touch and Display Driver Integration (TDDI) technology, which integrates the touch controller and display driver onto a single chip, has become the mainstream solution for mobile devices. Meanwhile, privacy-oriented display functionality achieves wide and narrow viewing angle switching by applying a privacy-oriented control signal to a privacy-oriented driving electrode (POD) within the panel, thereby controlling the deflection of liquid crystal molecules.

[0003] However, when TDDI and POD privacy circuits work together, such as Figure 1 As shown, the periodic drive signal output by the POD privacy circuit can interfere with the TDDI's touch detection through capacitive coupling (i.e., coupling the interference signal to the touch detection path through parasitic capacitance), causing problems such as false alarms, stuttering during alarm reporting, and decreased sensitivity of the touchscreen. Figure 2 As shown, with the privacy function enabled, the touch drawing test revealed broken lines; as Figure 3 As shown, the delta data of the touch detection channel exhibits significant periodic interference (shown in the red area of ​​the figure).

[0004] To address the aforementioned interference, existing technologies primarily employ the following solutions: Shielding and isolation solutions: Adding an electromagnetic shielding layer to block interference, but this increases cost and process complexity, and affects optical performance.

[0005] Pure software filtering schemes: noise is post-processed through digital filtering algorithms, but they cannot suppress interference at the source, and static parameters are difficult to adapt to dynamic changes.

[0006] Timing-staggered solution: This approach avoids interference by controlling the privacy signal and touch signal to operate in a time-sharing manner. For example, CN117519510A switches signals between different modes via a switch selection module. However, this solution has the following problems: frequent switching of the privacy signal can cause sudden changes in the liquid crystal electric field, resulting in screen flicker; essentially, it's a "time-for-space" trade-off, disconnecting the privacy signal during the touch detection window, sacrificing the continuity of the privacy function, or compressing the touch sampling time to avoid interference, affecting touch performance.

[0007] Therefore, improvements to existing technologies are necessary.

[0008] The above information is provided as background information only to aid in understanding this application and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this application. Summary of the Invention

[0009] This application provides a touch display device and its anti-interference method to solve the problems of high cost, discontinuity of privacy protection function or degradation of touch display performance in existing anti-interference technologies.

[0010] To achieve the above objectives, this application provides the following technical solution: In a first aspect, embodiments of this application provide an anti-interference method for a touch display device, the touch display device including a touch detection circuit and a privacy control circuit; the anti-interference method includes: Acquire timing reference signal; Based on the timing reference signal, the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit are adjusted so that the transition time of the privacy control signal is staggered from that of the touch detection window.

[0011] Optionally, the operating timing of the touch display device includes: alternately distributed display driving intervals and the touch detection window; The anti-interference method further includes: the transition time of the anti-spy control signal is adjusted to be within the display driving range, and the time interval between each transition time and its nearest touch detection window is not less than a preset minimum safe distance.

[0012] Optionally, the preset minimum safe distance is greater than the attenuation time of the coupling interference generated by the transition time.

[0013] Optionally, the transition time of the privacy control signal is adjusted to the position within the display driving range where the time interval with the closest touch detection window is the largest.

[0014] Optionally, adjusting the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit includes: The delay duration is determined based on the preset minimum safety distance and the current time interval between the transition time and the nearest touch detection window; Based on the timing reference signal, the waveform of the privacy control signal is delayed according to the delay duration, so that the transition time of the privacy control signal falls within the display driving range.

[0015] Optionally, the timing reference signal is the VS synchronization signal output by the touch detection circuit.

[0016] Optionally, the step of delaying the waveform of the privacy control signal according to the delay duration includes: delaying the waveform of each signal period of the privacy control signal by the delay duration as a whole, using a preset signal period as a unit.

[0017] Optionally, the step of delaying the waveform of the privacy control signal according to the delay duration includes: delaying only the transition time that is about to fall into the touch detection window by the delay duration.

[0018] Secondly, embodiments of this application provide a touch display device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the anti-interference method of the touch display device described in any of the above claims.

[0019] Thirdly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions thereon, which are executed by a computer processor to implement the anti-interference method of the touch display device described in any of the above claims.

[0020] Compared with the prior art, this application has the following beneficial effects: This application embodiment actively adjusts the timing of the privacy control signal and / or touch detection window by acquiring a timing reference signal, so that the transition time is staggered with the touch detection window, thus cutting off the coupling interference path at the source. It does not require disconnecting the privacy signal during the window period, which can avoid screen flickering caused by sudden changes in the liquid crystal electric field. It does not require extending the touch cycle or shortening the sampling time, which can maintain the original reporting rate and touch accuracy. It does not require adding a shielding layer, does not change the process, and has a low cost. At the same time, it automatically adapts to different display modes by using the real-time timing reference signal as a reference, realizing dynamic adaptive anti-interference.

[0021] This application has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the interference path of an existing touch display device; Figure 2 This is a schematic diagram of the broken line drawing phenomenon in TP under privacy mode; Figure 3 This is a schematic diagram of the periodic interference in existing TP delta data; Figure 4 This is a schematic diagram of the anti-interference scheme provided in the embodiments of this application; Figure 5 This is a waveform diagram of the anti-spy signal transition time and TP sensing window timing before anti-interference processing provided in the embodiments of this application; Figure 6 This is a waveform diagram of the anti-spy signal transition time and TP sensing window timing after anti-interference processing provided in the embodiments of this application; Figure 7 This is a test result table of touch performance indicators after anti-interference processing provided in the embodiments of this application; Figure 8 This is a test result diagram of touch line drawing after anti-interference processing provided in the embodiments of this application; Figure 9 This is a schematic diagram of periodic interference in TP delta data after anti-interference processing provided in the embodiments of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The inventors discovered through research that existing touch display devices, when integrating privacy protection functions, suffer from significant electromagnetic interference problems. This is because: Figures 1 to 3 As shown, the lack of a timing synchronization mechanism between the POD privacy circuit and the TDDI (or touch detection circuit) causes the level switching time of the privacy control signal (i.e., the transition time) to easily fall within the touch detection (TPsensing) window, meaning the two overlap in time. Because the voltage change rate is large during the privacy signal transition, it can couple to the touch detection path through parasitic capacitance, generating electromagnetic interference. This can lead to abnormal behaviors in touch detection, such as false alarms, alarm stuttering, and decreased sensitivity.

[0026] Traditional anti-interference technologies, while reducing interference to some extent, have various drawbacks such as degraded display and touch performance, high hardware costs, and poor dynamic adaptability.

[0027] Therefore, this application provides an anti-interference method for a touch display device, which includes a touch detection circuit and a privacy control circuit.

[0028] The touch detection circuit is used to perform touch detection functions: In the TDDI architecture, the touch detection circuit is integrated into the TDDI chip, shares a common electrode with the display driver circuit, and operates in a time-division multiplexing manner; in the discrete architecture, the circuit uses a separate touch chip. This application does not specifically limit the architecture type of the embodiments.

[0029] The privacy control circuit is used to generate and output privacy control signals. It typically includes an MCU (microcontroller unit) and a POD driver: the MCU is responsible for timing control and instruction generation, and the POD driver responds to the instructions to perform level switching and outputs drive voltage to the POD electrode.

[0030] The privacy control signal refers to the periodic driving signal applied to the POD electrode, used to control the deflection of liquid crystal molecules and switch between wide and narrow viewing angle (privacy) modes. During the level switching process, there is a transition period, called the transition time, during which the voltage change rate is relatively large, making it a major source of electromagnetic interference.

[0031] The touch detection window refers to the time interval during which the touch detection circuit performs capacitance sampling to determine if a touch has occurred. This period typically falls within the vertical or horizontal blanking period of the display scan. The timing reference signal coordinates the timing of both, enabling all functional units to work collaboratively with a unified time reference.

[0032] Specifically, the anti-interference method in this application includes: Acquire timing reference signal; Based on the timing reference signal, the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit are adjusted so that the transition time of the privacy control signal is staggered with the touch detection window in time.

[0033] Unlike existing technologies that use "on / off switching" or "shielding and isolation," this application employs a proactive timing adjustment method rather than interrupting signals or adding a physical layer: A timing reference signal is acquired, and the timing of the privacy control signal and / or the touch detection window is adjusted based on this reference signal, ensuring that the transition time of the privacy control signal is staggered from the touch detection window. Since the transition time no longer falls within the touch detection window, the signal generated during the transition process no longer overlaps with the touch sampling period, thus eliminating the conditions for electromagnetic interference at its physical source and avoiding the impact of interference on touch detection.

[0034] Existing time-sharing drive solutions (such as CN117519510A) employ a switch selection module to switch signals between different modes to address electromagnetic interference, disconnecting the privacy signal during the touch detection window. This frequent on / off operation causes abrupt changes in the liquid crystal electric field, resulting in screen flicker. In contrast, this application eliminates the need to disconnect the privacy signal. Instead, it uses timing adjustment to stagger the transition time of the privacy control signal from the touch detection window, while maintaining the privacy control signal at a constant level (without level switching) during the touch detection window. Because there is no on / off operation, the liquid crystal electric field remains stable, thus completely avoiding screen flicker.

[0035] Another existing solution, in order to avoid interference from privacy signals, is forced to extend the touch detection cycle or shorten the touch sampling time, resulting in problems such as reduced touch reporting rate, missed points, and false alarms, sacrificing touch performance. In contrast, this application solves the interference problem by staggering the timing rather than compressing the time. It does not require extending the touch detection cycle or shortening the touch sampling time. Therefore, the touch detection circuit can maintain the original reporting rate and sampling accuracy, and the real-time performance and accuracy of touch are not affected.

[0036] Another existing shielding and isolation solution blocks interference paths by adding an additional electromagnetic shielding layer to the panel. However, this solution increases hardware costs and process complexity, and may affect the optical performance of the panel. In contrast, this application solves the interference problem through timing adjustment, without adding any physical layers or shielding structures, and without changing the panel's stack-up architecture and process technology. Therefore, it does not incur additional hardware costs and does not affect the optical performance.

[0037] Another existing software filtering scheme is a post-processing method that can only filter out the interference signal that has already been generated, but cannot suppress the interference at the source; moreover, its filtering parameters are statically set, making it difficult to adapt to dynamically changing interference environments. This application eliminates the conditions for interference generation at the timing source, resulting in a relatively small or even non-existent interference component in the touch detection signal. Therefore, a relatively clean touch signal can be obtained without relying on post-processing filtering.

[0038] Furthermore, since the adjustment operation of this application uses a real-time acquired timing reference signal as a reference, it can automatically adapt to different display timing sequences as the timing reference signal changes. Therefore, when the display mode is switched, the frequency of the timing reference signal changes accordingly, and the adjustment operation of this application also adapts to the new timing parameters accordingly, so that the transition time and the touch detection window are always staggered. As a result, this application has good dynamic adaptability and can maintain a stable anti-interference effect in different display modes.

[0039] The display driving interval, also known as the DD (Display Driving Interval), refers to the time period during which a touch display device drives the display. During this period, the touch detection circuit does not perform touch sampling, and the common electrode is used to drive the liquid crystal molecules to deflect and display the image.

[0040] The touch detection window, as mentioned earlier, refers to the time interval during which the touch detection circuit performs capacitance sampling to determine whether there is a touch.

[0041] In this application, the operating timing of the touch display device includes alternating display driving intervals and touch detection windows. That is, on the timeline, the display driving interval and the touch detection window alternate sequentially: a touch detection window begins after one display driving interval ends, and the next display driving interval begins after the touch detection window ends, and so on. This "alternating distribution" is a typical timing characteristic of time-division multiplexing of touch and display in the TDDI architecture: since the touch detection circuit and the display driving circuit share the same electrode layer (common electrode), the two cannot work simultaneously and must be staggered in time.

[0042] Based on the above working timing, in an optional implementation, the anti-interference method further includes: the transition time of the anti-spy control signal is adjusted to be within the display driving range, and the time interval between each transition time and its nearest touch detection window is not less than a preset minimum safe distance.

[0043] For example, such as Figure 4 As shown, the TDDI IC outputs the TP_GPIO[0] signal (VS synchronization signal) to the MCU that controls the anti-spy control circuit; after the MCU reads the signal, it uses it as a timing reference to dynamically adjust the POD waveform.

[0044] This embodiment chooses to place the transition time within the display driving interval because: since the display driving interval and the touch detection window alternate in time, both sides of the display driving interval are touch detection windows. Placing the transition time within the display driving interval means that there is a certain interval between the transition time and the two touch detection windows before and after it (i.e., the first half and the second half of the display driving interval). By reasonably selecting the specific position of the transition time within the display driving interval (e.g., near the middle of the interval), sufficient time distance can be maintained between the transition time and the touch detection windows on both sides.

[0045] Furthermore, the preset minimum safe distance refers to the minimum allowable time interval between the transition time and its nearest touch detection window. The purpose of setting this minimum safe distance is that even if the transition process of the privacy signal generates some electromagnetic interference, as long as the attenuation time of this interference is less than the minimum safe distance, the interference signal will have attenuated to a level that has little or no impact on touch sampling when it enters the touch detection window. In other words, the minimum safe distance ensures sufficient isolation between the transition process of the privacy control signal and the touch detection window.

[0046] For example, the minimum safe distance is preset to be greater than the attenuation time of coupling interference generated during the transition time. The attenuation time of coupling interference refers to the time required for the highly coupled signal generated during the privacy signal transition to decay from its peak value to below a threshold that has a minimal impact on touch detection.

[0047] For example, when there are multiple transition positions that meet the minimum safe distance within the same display driving range, this embodiment can select the optimal position, that is, the position within the display driving range with the largest time interval between itself and the nearest touch detection window. Setting the transition time at this optimal position ensures that the transition time forms the maximum time interval with both the preceding and following touch detection windows, reserving sufficient attenuation time margin for coupling interference generated during the transition, and minimizing the risk of interference.

[0048] Thus, in this embodiment, the transition time is limited to the display driving interval, and the natural interval between it and the touch detection window is used to provide attenuation space for transition interference, ensuring that the interference has been greatly attenuated when the touch detection window is opened.

[0049] In one optional implementation, adjusting the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit includes: Based on the preset minimum safe distance and the current time interval between the transition time and the nearest touch detection window, if the current time interval is less than the preset minimum safe distance, it indicates that the current transition time is too close to the touch detection window, posing a risk of interference. Therefore, a delay duration is calculated such that after delaying the anti-peeping control signal according to this delay duration, the time interval between the transition time and the touch detection window is not less than the preset minimum safe distance, and the transition time falls within the display driving range. If the current time interval already meets the safe distance requirement, the delay duration can be set to zero (i.e., no adjustment is needed). Based on the timing reference signal, the waveform of the privacy control signal is delayed according to the delay duration, so that the transition time of the privacy control signal falls within the display driving range.

[0050] At this time, the timing reference signal can be selected as the VS synchronization signal output by the touch detection circuit.

[0051] Specifically, the MCU uses the edge of the VS synchronization signal (e.g., the rising edge) as the time zero point to start its internal timer. After the timer count reaches the delay duration, it sends a level switching command to the POD driver. The POD driver responds to the command by switching the level of the privacy control signal. As a result, the transition time of the privacy control signal is shifted backward by the entire delay duration relative to the VS edge, thus falling within the display driving range.

[0052] This implementation method, by "adjusting only the anti-spy control signal and not the touch detection window", effectively eliminates interference while maximizing the preservation of the original performance of the touch detection circuit and effectively reducing the implementation complexity.

[0053] Furthermore, in an optional embodiment, the method for delaying the waveform of the privacy control signal according to the delay duration may include: delaying the waveform of each signal period of the privacy control signal by a preset signal period as a whole.

[0054] Figure 5 and Figure 6 The timing relationships of the signals before and after delay adjustment are illustrated schematically, shown from top to bottom: Privacy control signal (POD waveform): The periodic drive signal output by the privacy control circuit, including the transition time of level switching and the non-transition period of maintaining a constant level; Touch display timing: The touch detection window and the display driving area (DD area) are distributed alternately in time. The touch detection window is used for capacitance sampling, and the display driving area is used for display refresh. VS synchronization signal: The frame synchronization signal (60Hz) output by the TDDI chip is used as the timing reference signal in this application.

[0055] like Figure 5 As shown, before adjustment: some transition times of the privacy control signal (such as the positions of DD3 and DD9) fall within the touch detection window, and the two overlap in time. At this time, the high voltage change rate during the transition process is coupled to the touch detection path through parasitic capacitance, generating electromagnetic interference.

[0056] like Figure 6 As shown, after adjustment: the single signal cycle of the privacy control signal (the part between the two vertical dotted lines in the figure, including two complete square waves) is shifted backward, so that all transition times fall within the display driving range and are staggered in time from the touch detection window. At the same time, the privacy control signal remains at a constant level (non-transition) during the touch detection window, and no interference is generated.

[0057] like Figures 7 to 9As shown, after the adjustment of the scheme in this application, the linearity, accuracy, jitter, signal-to-noise ratio, reporting rate, multi-touch and line drawing test of the touch display device all meet the preset design specifications, and there is no broken line phenomenon. The delta data of the touch detection channel shows that the periodic interference area is significantly reduced (as shown in the red area in the figure).

[0058] This verifies that, through the above adjustments, this application can eliminate electromagnetic interference at the source, while avoiding screen flicker, maintaining the continuity of the privacy function, and without sacrificing touch performance. Specifically, the embodiments of this application have the following effects: Eliminate interference at the source: By synchronizing the VS signal, the transition time of the anti-spy signal is precisely fixed within the DD interval, completely offset from the TPsensing window, thus cutting off the interference path at the physical level.

[0059] Eliminates display flicker: No need to frequently switch the privacy signal on and off, smooth level switching, and no sudden changes in the liquid crystal electric field.

[0060] Maintain touch performance: Touch detection requires no delay or frequency reduction, maintaining the original reporting rate (e.g., 120Hz), and the false alarm rate is significantly reduced.

[0061] Low hardware cost: It can be implemented using the existing VS output pin (TP_GPIO[0]) of TDDI without the need for additional shielding layers or circuits, and without changing the manufacturing process.

[0062] Privacy protection and touch detection work together: The privacy protection signal runs continuously without needing to be turned off, and does not interfere with touch detection.

[0063] Dynamic Adaptation: Using the VS signal as a synchronization reference, it automatically follows the TDDI cycle changes to adapt to different display modes.

[0064] Secondly, embodiments of this application provide a touch display device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the anti-interference method of the touch display device described in any of the above embodiments.

[0065] The above-described apparatus can execute the methods provided in any embodiment of this application, and has the corresponding functional modules and beneficial effects for executing the methods, which will not be described in detail here.

[0066] Thirdly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions thereon, which, when executed by a processor, implement the anti-interference method for the touch display device as provided in all embodiments of this application.

[0067] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0068] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0069] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0070] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0071] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An anti-interference method for a touch display device, characterized in that, The touch display device includes a touch detection circuit and a privacy control circuit; the anti-interference method includes: Acquire timing reference signal; Based on the timing reference signal, the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit are adjusted so that the transition time of the privacy control signal is staggered from that of the touch detection window.

2. The anti-interference method for a touch display device according to claim 1, characterized in that, The operating timing of the touch display device includes: alternately distributed display driving intervals and the touch detection window; The anti-interference method further includes: the transition time of the anti-spy control signal is adjusted to be within the display driving range, and the time interval between each transition time and its nearest touch detection window is not less than a preset minimum safe distance.

3. The anti-interference method for a touch display device according to claim 2, characterized in that, The preset minimum safe distance is greater than the attenuation time of the coupling interference caused by the transition time.

4. The anti-interference method for a touch display device according to claim 2, characterized in that, The transition time of the privacy control signal is adjusted to the position with the largest time interval between the display driving range and the closest touch detection window.

5. The anti-interference method for a touch display device according to claim 2, characterized in that, Adjusting the timing of the privacy control signal output by the privacy control circuit and / or the timing of the touch detection window of the touch detection circuit includes: The delay duration is determined based on the preset minimum safety distance and the current time interval between the transition time and the nearest touch detection window; Based on the timing reference signal, the waveform of the privacy control signal is delayed according to the delay duration, so that the transition time of the privacy control signal falls within the display driving range.

6. The anti-interference method for a touch display device according to claim 5, characterized in that, The timing reference signal is the VS synchronization signal output by the touch detection circuit.

7. The anti-interference method for a touch display device according to claim 5, characterized in that, The step of delaying the waveform of the privacy control signal according to the delay duration includes: delaying the waveform of each signal period of the privacy control signal by the delay duration as a whole, using a preset signal period as a unit.

8. The anti-interference method for a touch display device according to claim 5, characterized in that, The method of delaying the waveform of the privacy control signal according to the delay duration includes: delaying only the transition time that is about to fall into the touch detection window by the delay duration.

9. A touch display device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the anti-interference method of the touch display device as described in any one of claims 1-8.

10. A computer-readable storage medium having computer-executable instructions stored thereon, characterized in that, The computer-executable instructions are executed by a computer processor to implement the anti-interference method of the touch display device as described in any one of claims 1-8.

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