Touch display substrate, driving method thereof, driving circuit and display device

Abstract

The invention discloses a touch display substrate, a driving method thereof, a driving circuit and a display device, and relates to the technical field of display. The driving circuit is applied to a touch display substrate and a communication coil of the touch display substrate, and the driving circuit comprises a touch display module connected with the touch display substrate; the communication module is connected with the communication coil and is configured to provide a communication signal for the communication coil in a communication stage; the processing module is respectively connected with the touch display module and the communication module and is configured to provide a synchronizing signal for the touch display module; wherein the touch display module is configured to drive the touch display substrate to perform first touch detection and first picture display according to the synchronizing signal, and the first touch detection stage and the communication stage are not overlapped.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a touch display substrate and a driving method thereof, a driving circuit, and a display device. Background Art

[0002] Near Field Communication (NFC) has the advantages of high security, fast response speed and low cost, and is widely used in mobile payment, electronic tickets, access control and other fields. Summary of the invention

[0003] The present disclosure provides a driving circuit, which is applied to a touch display substrate and a communication coil of the touch display substrate. The driving circuit includes:

[0004] A touch display module connected to the touch display substrate;

[0005] a communication module connected to the communication coil and configured to provide a communication signal to the communication coil during a communication phase; and

[0006] a processing module, connected to the touch display module and the communication module respectively, and configured to provide a synchronization signal to the touch display module;

[0007] The touch display module is configured to: drive the touch display substrate to perform a first touch detection and a first screen display according to the synchronization signal, and the first touch detection phase does not overlap with the communication phase.

[0008] In some embodiments, the communication phase includes a monitoring phase, the communication signal includes a monitoring signal, and the communication module is specifically configured to: provide a monitoring signal to the communication coil during the monitoring phase;

[0009] The synchronization signal includes a first synchronization signal, and the first synchronization signal is used to indicate the start of the monitoring phase;

[0010] The touch display module is specifically configured to: after receiving the first synchronization signal for a first duration, drive the touch display substrate to perform a first touch detection and a first screen display, wherein the first duration is the duration of the monitoring phase.

[0011] In some implementations, the first touch detection phase, the first picture display phase, and the monitoring phase are three different phases within one frame period.

[0012] In some implementations, the first touch detection phase is located between the first picture display phase and the monitoring phase.

[0013] In some embodiments, the communication phase includes a read-write phase, the communication signal includes a read-write signal, and the communication module is specifically configured to: provide a read-write signal to the communication coil during the read-write phase;

[0014] The synchronization signal includes a second synchronization signal and a third synchronization signal, the second synchronization signal is used to indicate the start of the read / write phase, and the third synchronization signal is used to indicate the end of the read / write phase, and the processing module is specifically configured to: sequentially provide the second synchronization signal and the third synchronization signal to the touch display module;

[0015] The touch display module is configured to: after receiving the second synchronization signal and before receiving the third synchronization signal, drive the touch display substrate to display the first picture and stop the first touch detection.

[0016] In some embodiments, the touch display module is further configured to: drive the touch display substrate to display the first picture and stop the first touch detection within N frame periods after receiving the third synchronization signal, where N is a positive integer.

[0017] In some embodiments, N is greater than or equal to 1 and less than or equal to 3.

[0018] In some embodiments, the processing module is further configured to:

[0019] Acquiring the power of the monitoring signal;

[0020] If the power is greater than or equal to a first threshold, the first synchronization signal is provided to the touch display module.

[0021] In some embodiments, the processing module is further configured to: provide an indication signal to the touch display module if the power is less than or equal to a second threshold, the second threshold being less than or equal to the first threshold;

[0022] The touch display module is further configured to: drive the touch display substrate to perform a second touch detection and a second screen display according to the indication signal, wherein the second touch detection phase and / or the second screen display phase overlaps with the monitoring phase.

[0023] In some implementations, the processing module is connected to the touch display module via a two-wire serial bus or a flexible printed circuit board.

[0024] The present disclosure provides a touch display substrate, including a display area and a non-display area, wherein the display area includes a communication area and a non-communication area, and the touch display substrate includes:

[0025] A touch electrode, located in the display area, configured to transmit a touch signal during a touch detection phase;

[0026] An effective communication line, located in the communication area, configured to transmit a communication signal during a communication phase;

[0027] a virtual communication line, located in the non-communication area, configured to transmit the touch signal during the touch detection phase;

[0028] A plurality of scanning signal lines are located in the display area; and

[0029] A gate driving circuit is located in the non-display area, the gate driving circuit includes a plurality of shift registers cascaded to each other, the output end of the shift register is connected to the scanning signal line, the shift register includes: a signal generating circuit, and a filtering circuit connected to the output end of the signal generating circuit, the signal generating circuit is configured to generate a scanning signal, and the filtering circuit is configured to filter out high-frequency harmonics in the scanning signal, the frequency of the high-frequency harmonics includes the frequency of the subcarrier in the communication signal.

[0030] In some embodiments, the touch display substrate further includes:

[0031] The common signal line is located in the non-display area, connected to the virtual communication line, and configured to provide the touch signal to the virtual communication line during a touch detection phase.

[0032] In some embodiments, the touch display substrate further includes:

[0033] A connecting line is connected between the touch electrode and the virtual communication line, and is configured to transmit the signal on the touch electrode to the virtual communication line.

[0034] In some implementations, the filter circuit includes an RC filter circuit.

[0035] The present disclosure provides a display device, comprising: a touch display substrate, a communication coil, and a driving circuit as described in any one of the above, wherein the driving circuit is respectively connected to the touch display substrate and the communication coil, and is configured to provide display signals and touch signals to the touch display substrate, and provide communication signals to the communication coil.

[0036] The present disclosure provides a display device, comprising:

[0037] A touch display substrate as described in any one of the items; and

[0038] A driving circuit is connected to the touch display substrate and is configured to provide a display signal, a communication signal and a touch signal to the touch display substrate.

[0039] In some embodiments, the touch display substrate includes a plurality of sub-pixels arranged in an array, the touch display substrate supports a first frame frequency and a second frame frequency, the second frame frequency is greater than the first frame frequency, and a period corresponding to the first frame frequency is a first frame period. In a first frame period, the driving method includes:

[0040] In the picture refresh phase, each row of sub-pixels in the touch display substrate is charged row by row, and the charging time of a single row of sub-pixels is the charging time of a single row of sub-pixels at the second frame frequency;

[0041] During the image holding stage, the touch display substrate is driven to perform touch detection.

[0042] In some implementations, the ratio of the duration of the picture holding phase to the first frame period is greater than or equal to 0.3 and less than or equal to 0.5.

[0043] In some embodiments, the communication coil of the touch display substrate is used to transmit a communication signal, and the step of charging each row of sub-pixels in the touch display substrate row by row includes:

[0044] In response to the triggering of multiple valid pulses in the clock signal, each row of sub-pixels in the touch display substrate is charged row by row. The clock signal is a periodic pulse signal, and the frequency of the periodic pulse signal is the pulse frequency. The even multiple of the pulse frequency is different from the frequency of the communication signal.

[0045] In some embodiments, the pulse frequency is greater than or equal to 10 KHz and less than or equal to 12 KHz; and / or

[0046] The frequency of the subcarrier in the communication signal is greater than or equal to 800 KHz.

[0047] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0049] Figure 1 A schematic structural diagram of a touch display substrate is exemplarily shown;

[0050] Figure 2 A schematic structural diagram of another touch display substrate is exemplarily shown;

[0051] Figure 3 A schematic structural diagram of a gate drive circuit is exemplarily shown;

[0052] Figure 4 A schematic diagram of the structure of a shift register is shown exemplarily;

[0053] Figure 5 The timing diagram of the signals loaded on the auxiliary communication line and the touch electrode is exemplarily shown;

[0054] Figure 6 A schematic structural diagram of a driving circuit is exemplarily shown;

[0055] Figure 7 The signal timing diagram of the monitoring phase and the reading and writing phase is exemplarily shown;

[0056] Figure 8 The signal timing diagram of the driving process is exemplarily shown;

[0057] Fig. 9 The schematic diagrams of the results of two touch detections are shown exemplarily;

[0058] Fig.10 The curve of the filter bandwidth changing with the sampling time is shown by way of example;

[0059] Fig.11 Another signal timing diagram of the driving process is shown by way of example. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0061] In the related art, the NFC coil is made into a coil structure through metal leads on a printed circuit board or a flexible circuit board, and the printed circuit board or flexible circuit board containing the coil is attached to the battery or casing of the electronic device. Repeated disassembly and assembly of the battery and casing will cause the NFC coil to wear or misalign, affecting the transmission of the NFC signal. The NFC coil of this structure occupies a large space inside the electronic device, which will increase the thickness of the electronic device and cannot meet the design requirements of small electronic products.

[0062] The design of integrating NFC coil in the display substrate has the advantages of integration and lightness. By forming the NFC coil structure in a specific film layer in the touch display substrate, the display substrate can provide NFC communication function while having display function, which can effectively improve the sensitivity and reliability of NFC signal. Furthermore, the display substrate can also integrate touch circuit to realize the integration of display, touch and communication functions. The inventors found that products that integrate NFC coils in touch display substrates often have problems of touch ghost points or even touch failure, which greatly affects the user experience.

[0063] The present disclosure provides a touch display substrate, such as Figure 1 or Figure 2 As shown, the touch display substrate includes a display area AA and a non-display area BZ, and the display area AA includes a communication area A1 and a non-communication area A2. The touch display substrate includes: a touch electrode 11, located in the display area AA, configured to transmit a touch signal in the touch detection stage; an effective communication line 12, located in the communication area A1, configured to transmit a communication signal in the communication stage; a virtual communication line 13, located in the non-communication area A2, configured to transmit a touch signal in the touch detection stage.

[0064] For example, Figure 1 or Figure 2 As shown, in the communication area A1, a plurality of effective communication lines 12 may be arranged to cross each other to form a grid structure, and the cross-arranged effective communication lines 12 may be connected to each other at the cross position.

[0065] For example, Figure 1 or Figure 2 As shown, in the non-communication area A2, multiple virtual communication lines 13 can be arranged to cross each other to form a grid structure, and the cross-arranged effective communication lines 12 can be connected to each other at the cross position. By arranging virtual communication lines 13 in the non-communication area A2 to form the same grid structure as the communication area A1, the difference in transmittance between the communication area A1 and the non-communication area A2 can be reduced, and the display uniformity of the display area AA can be improved.

[0066] In related technologies, such as Figure 5As shown in Figure a, the virtual communication line 13 is connected to the DC regulated signal DC or grounded, and the touch electrode 11 is connected to the touch signal St during the touch detection phase, and touch problems are prone to occur in the non-communication area A2. The inventors analyzed and found that this is because there is a large coupling capacitance between the virtual communication line 13 and the touch electrode 11 in the non-communication area A2. When the voltage on the virtual communication line 13 and the touch electrode 11 is not equal, charge flow will occur. The charge flow changes the touch signal on the touch electrode 11, resulting in abnormal touch function.

[0067] The touch display substrate provided by the present disclosure is as follows: Figure 5 As shown in Figure b, during the touch detection stage, the virtual communication line 13 transmits the same touch signal St as the touch electrode 11, thereby eliminating the voltage difference between the virtual communication line 13 and the touch electrode 11, eliminating the charge flow caused by the coupling capacitor, and ensuring the normal use of the touch function.

[0068] Exemplarily, the effective communication line 12 is equivalent to the communication coil of the touch display substrate, and can realize the NFC communication function.

[0069] Exemplarily, the touch electrode 11 may also be shared with the common electrode of the sub-pixels in the display area AA, and is also used to transmit a common voltage signal in a non-touch stage.

[0070] In order to enable the virtual communication line 13 to transmit the touch signal in the touch detection phase, in a first implementation manner, as shown in FIG. Figure 1 As shown, the touch display substrate further includes: a common signal line 14, located in the non-display area BZ, connected to the virtual communication line 13, and configured to provide a touch signal to the virtual communication line 13 during the touch detection stage.

[0071] For example, Figure 1 As shown, the common signal line 14 can be connected to the touch display module 15 through a flexible circuit board to receive the VCOM OPT signal generated by the touch display module 15. In the touch detection stage, the VCOM OPT signal and the touch signal are synchronous signals with the same amplitude and frequency, thereby realizing the loading of the touch signal to the virtual communication line 13 in the touch detection stage.

[0072] Exemplarily, the touch display module 15 is a touch and display driver integration (TDDI) chip.

[0073] Exemplarily, the common signal line 14 is also used to provide a common voltage signal to the virtual communication line 13 in a non-touch stage.

[0074] In order to enable the virtual communication line 13 to transmit the touch signal in the touch detection phase, in the second implementation manner, as shown in FIG. Figure 2 As shown, the touch display substrate further includes: a connecting line 21 connected between the touch electrode 11 and the virtual communication line 13 , and configured to transmit the signal on the touch electrode 11 to the virtual communication line 13 .

[0075] For example, Figure 2 As shown, the virtual communication line 13 can be connected to the touch electrode 11 via the connecting line 21 .

[0076] Compared with the first embodiment, in the second embodiment, the problem of uneven display is prone to occur due to the large load of the virtual communication line 13. The first embodiment can avoid the problem of uneven display, and since the common signal line 14 is directly connected to the driver chip 15, it will not affect the touch or display function.

[0077] If the touch display substrate is regarded as a field, the signals it covers include display signals with higher voltages, such as scanning signals. Since the touch display substrate is located between the transmitting antenna and the receiving antenna, the high-order harmonics in these display signals can be spatially coupled to the subcarrier (such as 847KHz) of the communication signal, thereby affecting the NFC communication function. In addition, since the scanning signal is a square wave, which is the most typical distorted wave, it is composed of various harmonics, and the voltage difference of the scanning signal is large, and its various harmonics have large amplitudes. Therefore, it is necessary to filter the harmonics above 800KHz in the display signal.

[0078] In order to filter the harmonics above 800 KHz in the scanning signal, in some embodiments, as Figure 1 or Figure 2 As shown, the touch display substrate further includes: a plurality of scanning signal lines 16, located in the display area AA; and a gate drive circuit 17, located in the non-display area BZ. Figure 3 As shown, the gate drive circuit 17 includes a plurality of shift registers 31 cascaded to each other, and the output terminal Gout of the shift register 31 is connected to the scanning signal line 16. Figure 3 In the figure, gate-1 to gate-1280 are scanning signal lines 16.

[0079] like Figure 4 As shown, the shift register 31 includes: a signal generating circuit 41, and a filtering circuit 42 connected to the output terminal Gout0 of the signal generating circuit 41, the signal generating circuit 41 is configured to generate a scanning signal, and the filtering circuit 42 is configured to filter out high-frequency harmonics in the scanning signal, and the frequency of the high-frequency harmonics includes the frequency of the subcarrier in the communication signal.

[0080] In this embodiment, by setting a filter circuit 42 in the shift register 31, the output end Gout0 of the signal generating circuit 41 of the scanning signal is connected to the filter circuit 42, so that the harmonic components in the scanning signal that are close to the subcarrier frequency in the communication signal can be filtered out, thereby reducing interference with the communication signal and facilitating the normal use of the NFC communication function.

[0081] Exemplarily, the frequency of the subcarrier in the communication signal may be greater than or equal to 800 KHz, such as 847 KHz.

[0082] Exemplarily, the filter circuit 42 is a low-pass filter circuit 42 , and the cut-off frequency may be set to 800 kHz, for example.

[0083] In some embodiments, Figure 4 As shown, the filter circuit 42 includes an RC filter circuit 42 .

[0084] For example, Figure 4 As shown, the RC filter circuit 42 includes: a resistor R located between the output terminal Gout0 of the signal generating circuit 41 and the output terminal Gout of the shift register 31, and a capacitor C connected between the output terminal Gout of the shift register 31 and the ground potential GND.

[0085] According to the cutoff frequency formula of the first-order RC low-pass filter: f0 = 1 / 2πRC, if the cutoff frequency is set to 800kHz, the resistor R can be 800Ω and the capacitor C can be 20pF. In specific implementation, the capacitance of the capacitor C can be designed to be greater than or equal to 15pF and less than or equal to 25pF according to factors such as product resolution, frame rate, and the position of the NFC coil.

[0086] In specific implementation, there are two ways to perform NFC card swiping: the first is to set the NFC coil on the back of the display surface of the display substrate, and set ferrite between the NFC coil and the display substrate for isolation, which can achieve a better isolation effect; the second is to set the NFC coil on the outer edge of the entire display device housing, and then place ferrite on the side of the NFC coil away from the display surface of the display substrate. However, since the NFC coil is close to the display substrate and there is no ferrite or other wave-absorbing material between the NFC coil and the display substrate, the subcarrier signal in the communication signal is easily affected by the display signal, which hinders the development of card swiping applications on the front of the screen. Among them, the subcarrier signal frequency range is, for example, 800kHz to 900kHz.

[0087] The touch display substrate provided in this embodiment can filter the scanning signal at high frequency from the source, and can effectively reduce the interference of the scanning signal on the subcarrier signal in the communication signal. Therefore, it is conducive to the promotion of front card swiping applications.

[0088] It should be noted that the touch display substrate provided in the present disclosure is suitable for application scenarios of back-side card swiping or front-side card swiping.

[0089] The present disclosure provides a driving circuit, which is applied to a touch display substrate PNL and a communication coil AW of the touch display substrate PNL. Figure 6 As shown, the driving circuit includes: a touch display module 61, which is connected to the touch display substrate PNL; a communication module 62, which is connected to the communication coil AW and is configured to provide a communication signal to the communication coil AW during the communication stage; and a processing module 63, which is respectively connected to the touch display module 61 and the communication module 62 and is configured to provide a synchronization signal to the touch display module 61.

[0090] The touch display module 61 is configured to: drive the touch display substrate PNL to perform the first touch detection and the first picture display according to the synchronization signal, and the first touch detection phase TC1 does not overlap with the communication phase.

[0091] Exemplarily, the synchronization signal is used to indicate the start and / or end of a communication phase.

[0092] For example, Figure 7 As shown, a frame period T can be divided into a first picture refresh phase FR1 and a first picture holding phase RT1. For example, the step in which the touch display module 61 drives the touch display substrate PNL to display the first picture can be performed in the first picture refresh phase FR1, and the step in which the touch display module 61 drives the touch display substrate PNL to perform a first touch detection can be performed in the first picture holding phase RT1.

[0093] Exemplarily, the communication phase may include a listening phase LS and a reading and writing phase RW. In the listening phase LS, the communication coil AW (i.e., the NFC coil) emits a carrier wave at a fixed time to detect whether there is a card around, and enters the reading and writing phase RW after detecting a card, and reads the internal information of the card in the reading and writing phase RW.

[0094] In the monitoring stage LS, the communication coil AW will send a communication signal at a fixed time interval, and the communication signal will have a voltage jump. The inventors found that the voltage jump may cause the problem of touch ghost points, and it may occur at any time point in a frame period T.

[0095] In the read / write phase RW, the communication signal always has voltage jumps, which may also cause the problem of touch ghost points, and may occur at any time point in a frame period T. The duration of the read / write phase RW is positively correlated with the size of the card information. Generally, the duration of the read / write phase RW is greater than the duration of touch detection in a frame period T. The inventors also found that the touch ghost point phenomenon will also occur after switching from the read / write phase RW to the listening phase LS.

[0096] The driving circuit provided by the present disclosure uses a synchronization signal to ensure that the first touch detection stage TC1 does not overlap with the communication stage, that is, the first touch detection stage TC1 and the communication stage are performed in different time periods. In the communication stage, the touch display module 61 turns off the first touch detection function, and in the non-communication stage, the touch display module 61 starts the first touch detection function. In this way, by performing communication and the first touch detection in different time periods, the noise interference of communication on touch detection can be more thoroughly eliminated, the problem of touch ghost points and touch failure can be solved, and the normal use of the touch detection function can be ensured. Among them, the communication stage includes the listening stage LS and the reading and writing stage RW.

[0097] Exemplarily, the touch display substrate PNL may be the touch display substrate PNL provided in any embodiment.

[0098] Exemplarily, the communication coil AW may be integrated in the touch display substrate PNL, such as including an effective communication line integrated in the touch display substrate PNL, or may be provided independently of the touch display substrate PNL, which is not limited in the present disclosure.

[0099] Exemplarily, the processing module 63 may be a micro controller unit (MCU) on a mainboard.

[0100] Exemplarily, the touch display module 61 is a touch and display driver integration (TDDI) chip.

[0101] In some embodiments, the communication phase includes a listening phase LS, the communication signal includes a listening signal, and the communication module 62 is specifically configured to provide a listening signal to the communication coil AW during the listening phase LS.

[0102] In this embodiment, the synchronization signal includes a first synchronization signal S1, and the first synchronization signal S1 is used to indicate the start of the listening phase LS. Figure 7 As shown in FIG. a, the touch display module 61 is specifically configured to: after receiving the first synchronization signal S1 for a first duration, drive the touch display substrate PNL to perform a first touch detection and a first screen display, and the first duration t1 is the duration of the monitoring phase LS.

[0103] For example, Figure 7 As shown in Figure a, the first picture holding stage RT1 can be divided into a first touch detection stage TC1 and a monitoring stage LS. For example, the step of the touch display module 61 driving the touch display substrate PNL to perform the first touch detection can be performed in the first touch detection stage TC1, and the step of the communication module 62 executing the monitoring stage LS can be performed in the monitoring stage LS.

[0104] For example, in the first picture retention phase RT1, the first touch detection phase TC1 may be performed before the monitoring phase LS. Figure 7 As shown in Figure a of FIG. Of course, in the first picture holding stage RT1, the first touch detection stage TC1 can also be performed after the monitoring stage LS, and the present disclosure does not limit this.

[0105] For example, Figure 7 As shown in FIG. a, after receiving the first synchronization signal S1 for the first duration t1, the touch display integrated chip can first drive the touch display substrate PNL to display the first picture, and then drive the touch display substrate PNL to perform the first touch detection.

[0106] like Figure 7 As shown in FIG. a, when the touch display module 61 receives the first synchronization signal S1, the communication module 62 starts to execute the steps of the monitoring stage LS, and the monitoring stage LS ends after the first time length t1, and then the touch display module 61 drives the touch display substrate PNL to perform the first screen display and the first touch detection in sequence. In this way, through the first synchronization signal S1, the monitoring stage LS and the first touch detection can be performed in a time-sharing manner, eliminating the touch ghost points and touch failure problems that may occur in the monitoring stage LS.

[0107] In some embodiments, Figure 7 As shown in FIG. a, the first touch detection phase TC1, the first picture display phase FR1 and the monitoring phase LS are three different phases within one frame period.

[0108] In order to further reduce the influence of communication on touch detection, the first touch detection stage TC1 is located between the first picture display stage FR1 and the listening stage LS.

[0109] For example, Figure 7 As shown in Figure a, within a frame period T, the first picture display stage FR1, the first touch detection stage TC1 and the monitoring stage LS are performed sequentially without overlapping each other, so that the picture display, touch and communication do not interfere with each other, eliminating the problems of touch ghost points and touch failure.

[0110] In some embodiments, the communication phase includes a read-write phase RW, the communication signal includes a read-write signal, and the communication module 62 is specifically configured to provide a read-write signal to the communication coil AW during the read-write phase RW.

[0111] In this embodiment, the synchronization signal includes a second synchronization signal and a third synchronization signal. The second synchronization signal is used to indicate the beginning of the read / write phase RW, and the third synchronization signal is used to indicate the end of the read / write phase RW. The processing module 63 is specifically configured to provide the second synchronization signal S2 and the third synchronization signal S3 to the touch display module 61 in sequence.

[0112] Accordingly, if Figure 7 As shown in FIG. b, the touch display module 61 is configured to: after receiving the second synchronization signal S2 and before receiving the third synchronization signal S3, drive the touch display substrate PNL to display the first picture and stop the first touch detection.

[0113] For example, Figure 7 As shown in FIG. b, the read / write phase RW may occur in the first picture refresh phase FR1 and / or the first picture retention phase RT1.

[0114] like Figure 7 As shown in Figure b, first, the touch display module 61 receives the second synchronization signal S2, and the read-write phase RW begins; then, the touch display module 61 receives the third synchronization signal S3, and the read-write phase RW ends; in the first picture refresh phase FR1 during the read-write phase RW, the touch display module 61 drives the touch display substrate PNL to display the first picture, and stops the first touch detection in the first picture holding phase RT1 during the read-write phase RW. In this way, in the read-write phase RW, the touch detection function is stopped, and the display function is normal. In this way, through the second synchronization signal S2 and the third synchronization signal S3, the read-write phase RW and the touch detection can be carried out in time, eliminating the touch ghost points and touch failure problems that may occur in the read-write phase RW.

[0115] In some embodiments, the touch display module 61 is further configured to: drive the touch display substrate PNL to display the first picture and stop the first touch detection within N frame periods T after receiving the third synchronization signal S3, where N is a positive integer.

[0116] like Figure 7As shown in FIG. b, the touch display module 61 receives the third synchronization signal S3, the read-write phase RW ends, and the touch display module 61 drives the touch display substrate PNL to display the first image in the first image refresh phase FR1 within N frame periods T after the read-write phase RW ends, and the touch display module 61 stops the first touch detection in the first image retention phase RT1 within N frame periods T after the read-write phase RW ends. That is, the touch detection function is stopped N frame periods T after the read-write phase RW ends, and the display function is normal. In this way, the touch ghost point and touch failure problems caused by mode switching can be avoided.

[0117] In some embodiments, N is greater than or equal to 1 and less than or equal to 3.

[0118] For example, Figure 7 As shown in FIG. b, after the touch display module 61 receives the third synchronization signal S3, it suspends the touch detection function of the current frame; and then drives the touch display substrate PNL to perform the first touch detection and the first picture display according to the received synchronization signal.

[0119] In some implementations, the processing module 63 is further configured to: obtain the power of the monitoring signal; if the power is greater than or equal to a first threshold, provide a first synchronization signal S1 to the touch display module 61 .

[0120] When the power of the monitoring signal is large, conventional filtering algorithms cannot completely eliminate the noise interference caused by the communication signal to the touch signal. In this case, it is necessary to implement the time-sharing of the monitoring phase LS and the touch detection phase through the first synchronization signal S1 to ensure the normal use of the touch function.

[0121] In some embodiments, the processing module 63 is further configured to: if the power is less than or equal to the second threshold, provide an indication signal to the touch display module 61, and the second threshold is less than or equal to the first threshold. Correspondingly, the touch display module 61 is further configured to: according to the indication signal, drive the touch display substrate PNL to perform the second touch detection and the second screen display, wherein the second touch detection stage and / or the second screen display stage overlaps with the monitoring stage LS.

[0122] For example, Figure 7 As shown in FIG. c, a frame period T can be divided into a second picture refresh phase FR2 and a second picture retention phase RT2. For example, in the second picture refresh phase FR2, the touch display module 61 drives the touch display substrate PNL to display the second picture, and in the second picture retention phase RT2, drives the touch display substrate PNL to perform a second touch detection. Figure 7 As shown in Figure c, the second picture refresh phase FR2 and the second picture retention phase RT2 overlap with the monitoring phase LS.

[0123] When the power of the monitoring signal is relatively low, the conventional filtering algorithm can eliminate the noise interference caused by the communication signal to the touch signal, so that even if the monitoring stage LS and the touch detection stage are performed simultaneously, the normal use of the touch function can be ensured, and real-time uninterrupted touch can be achieved, thereby improving the touch detection effect. Therefore, when the power of the monitoring signal is relatively low, this embodiment supports the touch function and the monitoring function to be performed simultaneously.

[0124] In some implementations, the processing module 63 is connected to the touch display module 61 via a two-wire serial bus.

[0125] In this embodiment, the processing module 63 can send a synchronization signal to the touch display module 61 through a two-wire serial bus. The synchronization signal, for example, includes a first synchronization signal S1 such as 00, which is used to indicate the start of the listening phase LS, and can also include a second synchronization signal S2 such as 01, which is used to indicate the start of the read / write phase RW, and can also include a third synchronization signal S3 such as 10, which is used to indicate the end of the read / write phase RW.

[0126] In this embodiment, the processing module 63 can also send the same synchronization signal to the communication module 62 through the GPIO interface on the board. For example, the communication module 62 can also start the listening phase LS according to the first synchronization signal S1, start the reading and writing phase RW according to the second synchronization signal S2, and end the reading and writing phase RW according to the third synchronization signal S3.

[0127] This embodiment does not require any special changes to the hardware of the processing module 63, and the range of hardware options is wider.

[0128] In some embodiments, the processing module 63 is connected to the touch display module 61 via a flexible circuit board.

[0129] Exemplarily, the processing module 63 may use a general-purpose input / output (GPIO) port on the hardware to send the analog synchronization signal to the touch display module 61 through a flexible circuit board, and then the touch display module 61 determines the type of the synchronization signal according to the received analog synchronization signal. The types of synchronization signals may include: a first synchronization signal S1 indicating the start of the listening phase LS, a second synchronization signal S2 indicating the start of the reading and writing phase RW, and a third synchronization signal S3 indicating the end of the reading and writing phase RW.

[0130] The present disclosure provides a display device, such as Figure 6As shown, it includes: a touch display substrate PNL, a communication coil AW and a driving circuit DR provided in any embodiment, the driving circuit DR is respectively connected to the touch display substrate PNL and the communication coil AW, and is configured to provide display signals and touch signals to the touch display substrate PNL, and provide communication signals to the communication coil AW.

[0131] In the present disclosure, the communication coil AW may be integrated into the touch display substrate PNL, or may be provided independently of the touch display substrate PNL.

[0132] Those skilled in the art can understand that the display device has the advantages of the driving circuit provided in the previous embodiments.

[0133] The present disclosure provides a display device, such as Figure 6 As shown, it includes: a touch display substrate PNL as provided in any embodiment, and a driving circuit DR, the driving circuit DR is connected to the touch display substrate PNL, and is configured to provide display signals, touch signals and communication signals to the touch display substrate PNL.

[0134] In the present disclosure, the touch display substrate PNL includes an effective communication line 12, which is equivalent to integrating a communication coil AW.

[0135] Those skilled in the art can understand that the display device has the advantages of the touch display substrate PNL provided in the previous embodiments.

[0136] Exemplarily, the display device provided in the present disclosure is a product with an image display function. For example, the display device may be: a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a sales terminal, a digital camera, a portable camcorder, a viewfinder, a navigator, a vehicle, a large area of ​​wall, a home appliance, an information query device (such as business query equipment of e-government, banks, hospitals, power and other departments), and a monitor. The display device may also be a microdisplay or a product containing a microdisplay. The product containing a microdisplay may be any one of a smart watch, a smart bracelet, a helmet display, a stereo display mirror, an AR device (such as AR glasses), and a VR device (such as VR glasses).

[0137] The present disclosure provides a driving method of a touch display substrate PNL, wherein the touch display substrate PNL includes a plurality of sub-pixels arranged in an array, the touch display substrate PNL supports a first frame frequency and a second frame frequency, the second frame frequency is greater than the first frame frequency, and a period corresponding to the first frame frequency is a first frame period T1. Within a first frame period T1, the driving method includes:

[0138] Step S11: in the picture refresh phase FR, each row of sub-pixels in the touch display substrate PNL is charged row by row, and the charging time of a single row of sub-pixels is the charging time of a single row of sub-pixels at the second frame frequency.

[0139] Step S12: During the image retention stage RT, the touch display substrate PNL is driven to perform touch detection.

[0140] Exemplarily, the charging time of a single row of sub-pixels multiplied by the number of rows of sub-pixels is roughly the duration of the image refresh phase FR. Figure 8 As shown, the total duration of the picture refresh phase FR and the picture retention phase RT is a frame period T.

[0141] Exemplarily, the first frame frequency may be 60 Hz, for example, and the second frame frequency may be 90 Hz or 120 Hz, for example; or the first frame frequency may be 90 Hz, for example, and the second frame frequency may be 120 Hz, for example.

[0142] The driving method provided in the present disclosure may be applied to the touch display substrate PNL provided in any embodiment.

[0143] In the related art, when the frame frequency is the first frame frequency, the charging time of a single row of sub-pixels is the charging time of a single row of sub-pixels at the first frame frequency. The charging time of a single row of sub-pixels is longer, so the duration of the image refresh phase FR is longer, the duration of the image retention phase RT for touch detection is shorter, and the number of touch sampling cycles is smaller. Taking the 5.65-inch touch display substrate PNL as an example, the resolution is 720RGB×1440, such as Figure 8 As shown in Figure a, when the first frame frequency is 60Hz, the charging time of a single row of sub-pixels is 10 microseconds, the duration of the image refresh phase FR is 14.67ms, the duration of the image hold phase RT is 2ms, and the number of touch sampling cycles is 12. In this case, there is a touch ghost point problem. Fig. 9 Figure a in the figure shows a schematic diagram of touch detection results in the related art, and there is a risk of reporting points in the communication area A1 (the gray area in the figure).

[0144] The driving method provided by the present disclosure, when the frame frequency is the first frame frequency, the charging time of a single row of sub-pixels is the charging time of a single row of sub-pixels at the second frame frequency, which is shorter than the charging time of a single row of sub-pixels at the first frame frequency, which is equivalent to shortening the charging time of a single row of sub-pixels, thereby shortening the duration of the image refresh phase FR and extending the duration of the image retention phase RT, thereby increasing the number of touch sampling cycles. Taking the 5.65-inch touch display substrate PNL as an example, the resolution is 720RGB×1440, such as Figure 8As shown in Figure b, when the first frame frequency is 60Hz, the charging time of a single pixel is reduced from about 10 microseconds to about 6.5 microseconds (when the second frame frequency is 90Hz, the charging time of a single pixel is shortened by one third, and the RT duration of the picture retention phase is extended from the original 2ms to about 7.5ms. As a result, the number of touch sampling cycles is increased from the original 12 to 60, which can collect more noise data, improve noise optimization effect and anti-noise ability, and improve the signal-to-noise ratio of touch signals. Fig. 9 Figure b in the figure shows a schematic diagram of the touch detection result of the driving method provided by the present disclosure. In the entire display area AA, including the communication area A1 and the non-communication area A2, there is no risk of reporting points.

[0145] In specific implementation, the bandwidth of the digital filter can be reduced to avoid the operating frequency of NFC. According to the following multi-point mean filter formula:

[0146]

[0147] Among them, f is the sampling frequency, M is the number of sampling points, and H is the bandwidth. It can be found that at the same sampling frequency, the more sampling points there are, the smaller the filter bandwidth will be, such as Fig.10 As shown, more noise signals can be filtered out, and the higher the signal-to-noise ratio, the better the ability to resist noise interference.

[0148] The driving method provided in the present disclosure can improve the noise filtering effect and increase the signal-to-noise ratio by extending the touch detection time and increasing the number of sampling points.

[0149] In some embodiments, the ratio of the duration of the picture holding stage RT to the first frame period T1 is greater than or equal to 0.3 and less than or equal to 0.5. For example, the ratio of the duration of the picture holding stage RT to the first frame period T1 is 0.45.

[0150] In some embodiments, the communication coil AW of the touch display substrate PNL is used to transmit a communication signal, and step S11 may specifically include:

[0151] Step S21: In response to the triggering of multiple valid pulses PLS in the clock signal CLK, each row of sub-pixels in the touch display substrate PNL is charged row by row. Fig.11 As shown, the clock signal CLK is a periodic pulse signal, the frequency of the periodic pulse signal is the pulse frequency, and the even multiple of the pulse frequency is different from the frequency of the communication signal.

[0152] Exemplarily, the pulse frequency may be a scanning frequency, for example, the product of a frame frequency of the touch display substrate PNL and the number of sub-pixel rows.

[0153] Exemplarily, the clock signal CLK is a square wave signal with an amplitude of 30V.

[0154] In a specific implementation, the pulse frequency can be adjusted to prevent its even-numbered multiple frequency from falling within the frequency range of the communication signal, for example, to prevent its even-numbered multiple frequency from being 847KHz.

[0155] When the pulse frequency is changed, the duration of the picture holding phase RT and the duty cycle of the clock signal CLK can be adjusted accordingly.

[0156] In some embodiments, the pulse frequency is greater than or equal to 10 KHz and less than or equal to 12 KHz.

[0157] For example, taking a full high definition touch display substrate PNL with a frame frequency of 60 Hz as an example, the pulse frequency is 10 KHz and is less than or equal to 12 KHz.

[0158] In some implementations, the frequency of the subcarrier in the communication signal is greater than or equal to 800 KHz.

[0159] Among them, the center frequency of the NFC coil working frequency band is 13.56Mhz.

[0160] Exemplarily, the communication coil AW may be integrated in the touch display substrate PNL, or may be provided independently of the touch display substrate PNL, which is not limited in the present disclosure.

[0161] In the present disclosure, “plurality” means two or more, and “at least one” means one or more, unless otherwise clearly and specifically defined.

[0162] In the present disclosure, the orientation or positional relationship indicated by the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0163] As used herein, the terms "comprises," "includes," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, product, or device. In the absence of further limitations, an element defined by the phrase "includes a ..." does not exclude the presence of additional identical elements in the process, method, commodity, or device that includes the element.

[0164] References herein to "one embodiment," "some embodiments," "exemplary embodiments," "one or more embodiments," "example," "an example," "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0165] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0166] When describing some embodiments, the expressions "coupled" and "connected" may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. As another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0167] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0168] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0169] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [a stated condition or event] is detected" are optionally interpreted to mean "upon determining that" or "in response to determining that" or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0170] The use of "for" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0171] The use of "based on" or "according to" herein is meant to be open and inclusive. A process, step, calculation or other action based on one or more of the conditions or values ​​may, in practice, be based on other conditions or exceed the values ​​described. A process, step, calculation or other action based on one or more of the conditions or values ​​may, in practice, be based on other conditions or exceed the values ​​described.

[0172] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0173] As used herein, "parallel", "perpendicular", "equal", and "flush" include the situations described and situations similar to the situations described, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range for approximate equality may be, for example, that the difference between the two being equal is less than or equal to 5% of either one. "Flush" includes absolute flushness and approximate flushness, wherein the acceptable deviation range for approximate flushness may be, for example, that the distance between the two being flush is less than or equal to 5% of the size of either one.

[0174] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0175] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions is exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments. Unless otherwise specified, the thickness of a film layer refers to the size of the film layer in the direction of its normal.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A driving circuit applied to a touch display substrate and a communication coil of the touch display substrate, the driving circuit comprising: A touch display module connected to the touch display substrate; a communication module, connected to the communication coil, and configured to provide a communication signal to the communication coil during a communication phase; as well as a processing module, connected to the touch display module and the communication module respectively, and configured to provide a synchronization signal to the touch display module; The touch display module is configured to: drive the touch display substrate to perform a first touch detection and a first screen display according to the synchronization signal, and the first touch detection phase does not overlap with the communication phase.

2. The driving circuit according to claim 1, wherein: The communication phase includes a monitoring phase, the communication signal includes a monitoring signal, and the communication module is specifically configured to: provide a monitoring signal to the communication coil during the monitoring phase; The synchronization signal includes a first synchronization signal, and the first synchronization signal is used to indicate the start of the monitoring phase; The touch display module is specifically configured to: after receiving the first synchronization signal for a first duration, drive the touch display substrate to perform a first touch detection and a first screen display, wherein the first duration is the duration of the monitoring phase.

3. The driving circuit according to claim 2, wherein: The first touch detection phase, the first picture display phase and the monitoring phase are three different phases within one frame period.

4. The driving circuit according to claim 3, wherein: The first touch detection phase is located between the first picture display phase and the monitoring phase.

5. The driving circuit according to claim 1, wherein: The communication phase includes a read-write phase, the communication signal includes a read-write signal, and the communication module is specifically configured to: provide a read-write signal to the communication coil during the read-write phase; The synchronization signal includes a second synchronization signal and a third synchronization signal, the second synchronization signal is used to indicate the start of the read / write phase, and the third synchronization signal is used to indicate the end of the read / write phase, and the processing module is specifically configured to: sequentially provide the second synchronization signal and the third synchronization signal to the touch display module; The touch display module is configured to: after receiving the second synchronization signal and before receiving the third synchronization signal, drive the touch display substrate to display the first picture and stop the first touch detection.

6. The driving circuit according to claim 5, wherein: The touch display module is further configured to: drive the touch display substrate to display the first picture and stop the first touch detection within N frame periods after receiving the third synchronization signal, where N is a positive integer.

7. The driving circuit according to claim 6, wherein: The N is greater than or equal to 1 and less than or equal to 3.

8. The driving circuit according to claim 2, wherein: The processing module is further configured to: Acquiring the power of the monitoring signal; If the power is greater than or equal to a first threshold, the first synchronization signal is provided to the touch display module.

9. The driving circuit according to claim 7, wherein: The processing module is further configured to: provide an indication signal to the touch display module if the power is less than or equal to a second threshold, the second threshold being less than or equal to the first threshold; The touch display module is further configured to: drive the touch display substrate to perform a second touch detection and a second screen display according to the indication signal, wherein the second touch detection phase and / or the second screen display phase overlaps with the monitoring phase.

10. The driving circuit according to any one of claims 1 to 9, wherein: The processing module is connected to the touch display module via a two-wire serial bus or a flexible printed circuit board.

11. A touch display substrate, comprising a display area and a non-display area, wherein the display area comprises a communication area and a non-communication area, and the touch display substrate comprises: A touch electrode, located in the display area, configured to transmit a touch signal during a touch detection phase; An effective communication line, located in the communication area, configured to transmit a communication signal during a communication phase; a virtual communication line, located in the non-communication area, configured to transmit the touch signal during the touch detection phase; A plurality of scanning signal lines are located in the display area; as well as A gate drive circuit is located in the non-display area, the gate drive circuit includes a plurality of shift registers cascaded to each other, the output end of the shift register is connected to the scan signal line, the shift register includes: a signal generating circuit, and a filter circuit connected to the output end of the signal generating circuit, the signal generating circuit is configured to generate a scan signal, and the filter circuit is configured to filter out high-frequency harmonics in the scan signal, the frequency of the high-frequency harmonics includes the frequency of the subcarrier in the communication signal.

12. The touch display substrate according to claim 11, wherein: The touch display substrate further includes: The common signal line is located in the non-display area, connected to the virtual communication line, and configured to provide the touch signal to the virtual communication line during a touch detection phase.

13. The touch display substrate according to claim 11, wherein: The touch display substrate further includes: A connecting line is connected between the touch electrode and the virtual communication line, and is configured to transmit the signal on the touch electrode to the virtual communication line.

14. The touch display substrate according to any one of claims 11 to 13, wherein: The filter circuit includes an RC filter circuit.

15. A display device, comprising: A touch display substrate, a communication coil, and a driving circuit as described in any one of claims 1 to 10, wherein the driving circuit is respectively connected to the touch display substrate and the communication coil, and is configured to provide display signals and touch signals to the touch display substrate, and provide communication signals to the communication coil.

16. A display device, comprising: The touch display substrate according to any one of claims 11 to 14; as well as A driving circuit is connected to the touch display substrate and is configured to provide a display signal, a communication signal and a touch signal to the touch display substrate.

17. A method for driving a touch display substrate, the touch display substrate comprising a plurality of sub-pixels arranged in an array, the touch display substrate supporting a first frame frequency and a second frame frequency, the second frame frequency being greater than the first frame frequency, the period corresponding to the first frame frequency being a first frame period, and within a first frame period, the driving method comprising: In the picture refresh phase, each row of sub-pixels in the touch display substrate is charged row by row, and the charging time of a single row of sub-pixels is the charging time of a single row of sub-pixels at the second frame frequency; During the image holding stage, the touch display substrate is driven to perform touch detection.

18. The driving method according to claim 17, wherein: The ratio of the duration of the picture holding phase to the first frame period is greater than or equal to 0.3 and less than or equal to 0.

5.

19. The driving method according to claim 17 or 18, wherein: The communication coil of the touch display substrate is used to transmit communication signals, and the step of charging each row of sub-pixels in the touch display substrate row by row includes: In response to the triggering of multiple valid pulses in the clock signal, each row of sub-pixels in the touch display substrate is charged row by row. The clock signal is a periodic pulse signal, and the frequency of the periodic pulse signal is the pulse frequency. The even multiple of the pulse frequency is different from the frequency of the communication signal.

20. The driving method according to claim 19, wherein: The pulse frequency is greater than or equal to 10KHz and less than or equal to 12KHz; and / or The frequency of the subcarrier in the communication signal is greater than or equal to 800 KHz.

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