TWI838183B - Timing control method and related timing control circuit - Google Patents

Abstract

A timing control method for a touch display device includes obtaining a horizontal synchronization signal, a vertical synchronization signal or a test enable signal of a touch display panel of the touch display device from a display driving circuit of the touch display device to determine a display configuration of the touch display panel; determining a frame rate of the touch display panel; and allocating the touch sensing signals of the touch sensing circuit with a fixed time interval according to a current frame rate of the touch display panel and aligning allocations of touch sensing signals of a touch sensing circuit of the touch display device with the display configuration according to the varied frame rate.

Description

Timing control method and related timing control circuit

The present invention refers to a timing control method and a related timing control circuit, in particular, a timing control method and a related timing control circuit for controlling a touch sensing signal in timing to remove noise interference.

The touch panel and display driver chip of the existing touch display device operate at different timings. Therefore, the time for scanning the touch sensing signal of the touch panel in each frame of the display driver chip is not fixed, resulting in the data received by the touch panel in the previous and next frames not having similar characteristics, which in turn affects the signal quality of the touch panel in coordinate calculation.

However, the display driver chip can only provide vertical synchronization signals and horizontal synchronization signals when the touch panel is on to support the synchronization mechanism of touch sensing and display driving. When the touch panel is on a dark screen, there is a lack of reference signals and synchronization cannot be performed. In addition, when the resolution and frame rate of the touch panel are changed, the cycle of the horizontal and vertical synchronization signals changes, causing the relative time point of the display cycle when the touch sensing is scanning to change (increase or decrease), so that the noise characteristics received by the touch sensing from the touch panel and the display device are different, which is easy to cause false alarm points.

Therefore, the existing technology needs to be improved.

In view of this, the present invention provides a timing control method and its related timing control circuit to adjust the touch sensing signal in timing to effectively avoid the display period with noise, thereby removing the noise of the display panel.

The present invention discloses a timing control method for a touch display device, comprising obtaining a horizontal synchronization signal, a vertical synchronization signal or a test enable signal of a touch display panel of the touch display device from a display driving circuit of the touch display device to determine a display configuration of the touch display panel; confirming a frame rate of the touch display panel; and configuring the touch sensing signal of the touch sensing circuit to have a spacing in timing according to a current frame rate of the touch display panel, and synchronizing the configuration of the touch sensing signal of the touch sensing circuit of the touch display device with the display configuration.

The present invention also discloses a timing control circuit for a touch display device, comprising a timing generator for generating a timing signal similar to a touch display panel of the touch display device; an input stage circuit coupled to a display driving circuit of the touch display device and the timing generator to output at least one of a horizontal synchronization signal, a vertical synchronization signal, and a test enable signal of the touch display panel and output a timing signal similar to the touch display panel; a frame rate detector coupled to the timing generator; connected to the input stage circuit, used to determine a display configuration of the touch display panel according to at least one of the horizontal synchronization signal, the vertical synchronization signal and the test enable signal; and a touch synchronization control circuit, used to confirm a frame rate of the touch display panel, configure the touch sensing signal of the touch sensing circuit to have a spacing in timing according to a current frame rate of the touch display panel, and synchronize the configuration of the touch sensing signal of the touch sensing circuit of the touch display device with the display configuration.

10: Touch display device

102: Display driver circuit

104: Timing control circuit

106: Touch sensing circuit

104_TG: Timing Generator

104_IS: Input stage circuit

104_PVG: Pseudo vertical synchronization signal generator

104_CB: Synchronous mode configuration database

104_PC: Frame rate/cycle calculator

104_FRD: Frame Rate Detector

104_TC: Touch synchronous control circuit

50,80: Timing control method

502-510,802-810: Steps

Hsync: horizontal synchronization signal

TE: Test enable signal

P_Hsync: Pseudo horizontal synchronization signal

P_Vsync: Pseudo vertical synchronization signal

P_Vsync_reference: Pseudo vertical synchronization signal

SG,SG_0,SG_1,SG_2,SG_3: Touch sensing process

T0, T1, T2: time points

T_config: touch configuration

TH:Threshold

TP_clock: clock

Vsync: vertical synchronization signal

Vsync_reference: vertical synchronization signal

Figure 1 is a schematic diagram of a touch display device according to one embodiment of the present invention.

Figure 2 is a schematic diagram of a frame rate detector according to an embodiment of the present invention.

Figures 3 and 4 are timing diagrams of the touch display signal of a touch display panel in one embodiment of the present invention.

Figure 5 is a schematic diagram of a timing control method of one embodiment of the present invention.

Figures 6 and 7 are timing diagrams of the touch display signal of the touch display panel of the embodiment of the present invention.

Figure 8 is a schematic diagram of a timing control method of one embodiment of the present invention.

Please refer to FIG. 1, which is a schematic diagram of a touch display device 10 according to an embodiment of the present invention. The touch display device 10 includes a display driver circuit 102, a touch display panel (not shown), a timing control circuit 104, and a touch sensing circuit 106. The display driver circuit 102 may be a driver chip of the touch display panel, and the timing control circuit 104 controls the configuration of the touch sensing signal of the touch sensing circuit 106 according to the timing signal of the touch display panel obtained from the display driver circuit 102. In one embodiment, the touch sensing signal includes a touch processing flow and a signal related to the touch sensing flow. In this way, the timing control circuit 104 of the embodiment of the present invention can reduce the interference of noise by aligning the touch sensing signal with the timing signal of the touch display panel.

In detail, the timing control circuit 104 includes a timing generator 104_TG, an input stage circuit 104_IS, a pseudo vertical synchronization signal generator 104_PVG, a synchronization mode configuration database 104_CB, a frame rate/cycle calculator 104_PC, a frame rate detector 104_FRD, and a touch synchronization control circuit 104_TC. The timing generator 104_TG is used to generate a timing signal similar to a touch display panel, such as a horizontal synchronization signal, a vertical synchronization signal, or a test enable signal of the touch display panel, wherein the timing signal generated by the timing generator 104_TG has the characteristics of a timing signal of a real touch display panel. The input stage circuit 104_IS is coupled to the display driver circuit 102 and the timing generator 104_TG, and outputs at least one of a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, and a test enable signal TE of the touch display panel, and outputs a timing signal similar to the touch display panel generated by the timing generator 104_TG.

The pseudo vertical synchronization signal generator 104_PVG is coupled to the input stage circuit 104_IS, and is used to output a pseudo vertical synchronization signal P_Vsync according to a timing signal similar to the touch display panel. The synchronization mode configuration database 104_CB is used to store at least one touch configuration T_config, such as self-capacitance, mutual capacitance, active touch pen and other touch configurations. The frame rate/cycle calculator 104_PC is used to detect the cycle information of each frame of the touch display panel. The frame rate detector 104_FRD is coupled to the input stage circuit 104_IS, and is used to determine a display configuration of the touch display panel according to at least one of the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync, and the test enable signal TE of the touch display panel. The touch synchronization control circuit 104-TC is used to determine the configuration of the touch sensing signal according to the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync, at least one of the test enable signal TE, the pseudo vertical synchronization signal P_Vsync and the synchronization mode configuration database 104_CB, and the configuration of the touch sensing signal of the touch synchronization control circuit 104_TC has a specific interval in timing.

Please refer to FIG. 2, which is a schematic diagram of the frame rate detector 104_FRD of the embodiment of the present invention. The frame rate detector 104_FRD determines the display configuration of the touch display panel according to the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync, the test enable signal TE, a threshold TH1, a threshold TH2 and a clock TP_clock of the touch sensing circuit 106 of the touch display panel.

In addition, the frame rate detector 104_FRD can confirm whether the pulse width of the horizontal synchronization signal Hsync and the leading and trailing edges (porch) of the vertical synchronization signal Vsync of the touch display panel change according to the above parameters, so as to determine whether the display configuration of the touch display panel changes. For example, when the pulse width of the horizontal synchronization signal Hsync or the leading and trailing edges (porch) of the vertical synchronization signal Vsync of the touch display panel changes, the frame rate detector 104_FRD can send a horizontal frame rate change interrupt signal or a vertical frame rate change interrupt signal; on the contrary, when the pulse width of the horizontal synchronization signal Hsync or the leading and trailing edges of the vertical synchronization signal Vsync of the touch display panel does not change, the frame rate detector 104_FRD determines that the display state of the touch display panel has not changed.

In one embodiment, the detection results of the frame rate detector 104_FRD and the frame rate/cycle calculator 104_PC can be used to record the brightness configuration of the current picture. If the detection results of the frame rate detector 104_FRD and the frame rate/cycle calculator 104_PC indicate that the picture has not changed, the display driver circuit 102 can directly maintain the current picture.

The threshold TH1 of the input parameter of the frame rate detector 104_FRD may be the number of pulses of the horizontal synchronization signal Hsync, and the threshold TH2 may be the system cycle time of the horizontal synchronization signal Hsync. The frame rate detector 104_FRD may determine the change of the vertical synchronization signal Vsync according to the change of the number of pulses of the horizontal synchronization signal Hsync of the threshold TH1. In addition, the frame rate detector 104_FRD may determine the change of the horizontal synchronization signal Hsync according to the change of the system cycle time of the horizontal synchronization signal Hsync of the threshold TH1 (i.e., the width of the pulse of the horizontal synchronization signal Hsync) and the clock TP_clock of the touch sensing circuit 106. In this way, the timing control circuit 104 of the touch display device 10 of the embodiment of the present invention can adjust the configuration of the touch sensing signal through a large delay (i.e., the number of pulses of the horizontal synchronization signal Hsync) and a small delay (i.e., the cycle time of the horizontal synchronization signal Hsync).

Since the touch display device 10 of the embodiment of the present invention can be set according to the frame rate (i.e., refresh rate or resolution) of the touch display panel, the touch sensing signal of the touch sensing circuit 106 can be dynamically configured in timing to reduce the background interference caused by the touch display panel of the touch display device 10.

In one embodiment, when the display driver circuit 102 switches the frame rate of the touch display panel, the period of the vertical synchronization signal Vsync of the touch display panel changes, causing a difference in the time point at which the touch sensing signal is scanned.

In order to change the frame rate of the touch display panel without changing the reporting frequency of the touch sensing, so as to provide the user with the same touch feeling or experience. Please refer to Figures 3 and 4, which are timing diagrams of the touch display signal of the touch display panel of the embodiment of the present invention.

As shown in FIG. 3 , when the touch display panel is in the bright screen state, the horizontal synchronization signal Hsync (60Hz in this case) and the vertical synchronization signal Vsync are displayed as shown in the figure. After confirming the current cycle of the vertical synchronization signal Vsync (that is, a current frame rate), the touch sensing signal SG configuration is calculated. At this time, the pseudo vertical synchronization signal generator 104_PVG generates a pseudo vertical synchronization signal P_Vsync (120Hz in this case) as a reference point for checking the vertical synchronization signal Vsync. A preset constant X is used as the synchronization start time of the vertical synchronization signal Vsync and the pseudo vertical synchronization signal P_Vsync. Thereafter, the touch sensing signal SG is configured at a distance within a cycle of the vertical synchronization signal Vsync. The default constant X is related to the pulse number of the horizontal synchronization signal Hsync and the system cycle to determine the relative time point of the vertical synchronization signal Vsync and the touch sensing signal SG.

When the frame rate of the touch display panel is switched, for example, when the display frame rate is switched from 60Hz to 30Hz, the horizontal synchronization signal Hsync changes from 290Khz@60Hz to 145Khz@30Hz, causing the Vsync cycle to change, resulting in differences in the timing of touch reporting and different noise received by the touch. When the cycle of the horizontal synchronization signal Hsync changes, the noise characteristics received by the display device during the touch sensing process will also be different. The algorithm needs to spend extra time to calibrate. If the same touch reporting frequency is maintained, it will affect the user's physical sensation (i.e. the frequency of touch response becomes faster or slower).

Therefore, as shown in FIG. 4, when the frame rate of the touch display panel changes, the touch display device 10 of the embodiment of the present invention updates the real-time synchronization signal of the touch display panel (i.e., the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync, or the test enable signal TE), reconfirms the current cycle of the vertical synchronization signal Vsync, recalculates the touch sensing signal SG configuration, updates the default constant X of the pseudo vertical synchronization signal P_Vsync, dynamically adjusts the configuration of the touch sensing signals SG_0-SG_3, and synchronizes the configuration of the touch sensing signal of the touch sensing circuit 106 with the display configuration, wherein the configuration of the touch sensing signal of the touch sensing circuit 106 has a spacing in timing.

In this way, the touch display device 10 of the embodiment of the present invention can adjust the frame rate of the touch display panel and evenly distribute the touch sensing signal SG and the start-up time in each frame of the touch display panel and the specific horizontal synchronization signal to obtain better signal quality and touch return rate.

The operation of the above-mentioned dynamic configuration touch sensing signals SG_0-SG_3 can be summarized as a timing control method 50. The timing control method 50 can be used for the touch display device 10, and includes the following steps: Step 502: Obtain the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync or the test enable signal TE of the touch display panel of the touch display device 10 from the display driver circuit 102 of the touch display device 10 to determine the display configuration of the touch display panel; Step 504: Change the touch display panel The frame rate of the panel; Step 506: Update the horizontal synchronization signal Hsync, vertical synchronization signal Vsync or test enable signal TE of the touch display panel; Step 508: Update the pseudo vertical synchronization signal P_Vsync or pseudo horizontal synchronization signal P_Hsync; Step 510: Synchronize the configuration and display configuration of the touch sensing signal of the touch sensing circuit 106 of the touch display device 10.

Regarding the operation process of the timing control method 50, please refer to the above-mentioned embodiment of the touch display device 10, which will not be elaborated here.

In another embodiment, when the touch display panel of the touch display device 10 of the present invention switches between bright and dark screens, the signal of the touch sensing circuit 106 can also be dynamically configured in timing to reduce the interference of the touch display device 10 on the touch sensing signal when the screen is bright.

Please refer to Figure 6, which is a timing diagram of the touch display signal of the touch display panel of the embodiment of the present invention. At a time point T0, since the touch display panel of the touch display device 10 is a dark screen, it cannot provide a real-time synchronization signal (i.e., horizontal synchronization signal Hsync, vertical synchronization signal Hsync, and test enable signal TE), therefore, the timing control circuit 104 of the touch display device 10 determines the display state of the touch display panel according to the pseudo synchronization signal (i.e., pseudo vertical synchronization signal P_Vsync and pseudo horizontal synchronization signal H_sync), and serves as a basis for configuring the touch sensing signal.

It is worth noting that when the touch display panel is in a dark screen state, the pseudo vertical synchronization signal P_Vsync and the pseudo horizontal synchronization signal H_sync can be generated by a lookup table, or can also be generated by the horizontal synchronization signal Hsync, vertical synchronization signal Hsync and test enable signal TE recorded when the touch display panel is in a bright screen state.

For example, the pseudo vertical synchronization signal P_Vsync can be determined based on one cycle of the horizontal synchronization signal Hsync, the number of pulses of the horizontal synchronization signal Hsync when the touch display panel is in the bright screen state, and the frame rate of the touch display panel. In addition, the pseudo horizontal synchronization signal Hsync can be determined based on one cycle of the vertical synchronization signal Vsync or the test enable signal TE when the touch display panel is in the bright screen state.

At a time point T1, the touch display panel changes from a dark screen to a bright screen, and the frame rate/cycle calculator 104_PC and the frame rate detector 104_FRD of the timing control circuit 104 can determine the display configuration of the touch display panel according to the real-time synchronization signal (i.e., horizontal synchronization signal Hsync, vertical synchronization signal Vsync, test enable signal TE) of the touch display panel from the display driver chip 102. In other words, when the touch display panel changes from a dark screen state to a bright screen state, a current display configuration of the touch display panel is re-acquired.

At a time point T2, the timing control circuit 104 can synchronize the configuration of the touch sensing signal of the touch sensing circuit 106 of the touch display device 10 with the display configuration determined by the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync from the display driver chip 102. A vertical synchronization signal Vsync_reference at the time point T2 can be used as a reference signal for the timing control circuit 104 to use the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync of the display driver chip 102 as synchronization basis when the touch display panel changes from a dark screen to a bright screen.

Please refer to FIG. 7, which is a timing diagram of the touch display signal of the touch display panel of the embodiment of the present invention. Compared with FIG. 6, FIG. 7 is an example of the touch display panel switching from a bright screen to a dark screen. At time point T0, the timing control circuit 104 can synchronize the configuration of the touch sensing signal of the touch sensing circuit 106 of the touch display device with the display configuration according to the display configuration determined by the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync from the display driver chip 102.

At time point T1, the touch display panel of the touch display device 10 changes from a bright screen to a dark screen, and is unable to continue to provide the horizontal synchronization signal Hsync, the vertical synchronization signal Hsync, and the test enable signal TE.

At time point T2, the timing control circuit 104 of the touch display device 10 can use a pseudo vertical synchronization signal P_Vsync_reference generated by the pseudo vertical synchronization signal generator 104_PVG as a reference signal, and determine the display state of the touch display panel based on the pseudo vertical synchronization signal P_Vsync and the pseudo horizontal synchronization signal H_sync, and then use the current display state as the basis for configuring the touch sensing signal.

In this way, the touch display device 10 of the embodiment of the present invention can dynamically configure the touch sensing signal of the touch sensing circuit 106 in timing when the display device switches between bright and dark screens, so as to reduce the background interference caused by the bright screen of the display device, and can also maintain the synchronous timing and performance when the screen is dark and realize the dark screen touch function. In addition, the bright and dark screen switching can continue to maintain the synchronization state after one cycle of the pseudo vertical synchronization signal P_Vsync.

The operation of the above-mentioned dynamic configuration touch sensing signals SG_0-SG_3 can be summarized as a timing control method 80. The timing control method 80 can be used for the touch display device 10, and includes the following steps: Step 802: Obtain the horizontal synchronization signal Hsync, the vertical synchronization signal Vsync or the test enable signal TE of the touch display panel of the touch display device 10 from the display driver circuit 102 of the touch display device 10 to determine the display configuration of the touch display panel; Step 804: Confirm the light and dark state of the touch display panel; Step 806: When the touch display panel is in the dark screen state, The pseudo horizontal synchronization signal P_Hsync and pseudo vertical synchronization signal P_Vsync of the touch display panel determine the display state of the touch display panel; Step 808: When the touch display panel is in the bright screen state, the horizontal synchronization signal H_sync and vertical synchronization signal V_sync of the touch display panel determine the display state of the touch display panel; Step 810: Synchronize the configuration and display configuration of the touch sensing signal of the touch sensing circuit 106 of the touch display device 10.

Regarding the operation process of the timing control method 80, please refer to the above-mentioned embodiment of the touch display device 10, which will not be elaborated here.

In summary, the timing control circuit of the embodiment of the present invention can adjust the relative time points of the touch sensing signal and the timing signal of the touch display panel when adjusting the frame rate of the touch display panel, and when switching the light and dark screen of the touch display screen, it can maintain the original touch sensing operation by switching the real-time synchronization signal and the pseudo synchronization signal, thereby avoiding the generation of noise and maintaining a stable touch sensing reporting rate.

The above is only the preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

50: Timing control method

502-510: Steps

Claims (20)

A timing control method for a touch display device includes: obtaining a horizontal synchronization signal, a vertical synchronization signal or a test enable signal of a touch display panel of the touch display device from a display driving circuit of the touch display device to determine a display configuration of the touch display panel; confirming a frame rate of the touch display panel; and configuring a touch sensing signal of a touch sensing circuit of the touch display device to have a spacing in timing according to a current frame rate of the touch display panel, and synchronizing the configuration of the touch sensing signal of the touch sensing circuit of the touch display device with the display configuration. The timing control method as described in claim 1 further includes: setting the configuration of the touch sensing signal of the touch sensing circuit to have a spacing in timing, and setting a fixed spacing between the vertical synchronization signal and a pseudo vertical synchronization signal as a reference point for the vertical synchronization signal and the pseudo vertical synchronization signal. The timing control method as described in claim 2 further includes: when the frame rate of the touch display panel is changed, recalculating the configuration of the touch sensing signal of the touch sensing circuit of the touch display device; and updating the reference points of the vertical synchronization signal and the pseudo vertical synchronization signal. The timing control method as described in claim 1 further includes: confirming a light-dark state of the touch display panel; when the touch display panel is in a dark screen state, using a pseudo horizontal synchronization signal and a pseudo vertical synchronization signal of the touch display panel to determine the display state of the touch display panel; and When the touch display panel is in a bright screen state, using the horizontal synchronization signal and the vertical synchronization signal of the touch display panel to determine the display state of the touch display panel. The timing control method as described in claim 4, wherein when the touch display panel is in the dark screen state, the false horizontal synchronization signal and the false vertical synchronization signal are generated by a table lookup method. The timing control method as described in claim 4, wherein the pseudo vertical synchronization signal is determined based on a period of the horizontal synchronization signal, a number of pulses of the horizontal synchronization signal when the touch display panel is in the bright screen state, and the frame rate of the touch display panel. The timing control method as described in claim 4, wherein the pseudo horizontal synchronization signal is determined based on a cycle of the vertical synchronization signal or the test enable signal of the touch display panel when the screen is in the bright state. The timing control method as described in claim 4, wherein the false horizontal synchronization signal and the false vertical synchronization signal do not stop when the touch display panel changes from the dark screen state to the bright screen state or from the bright screen state to the dark screen state. The timing control method as described in claim 4, wherein when the touch display panel changes from the bright screen state to the dark screen state, the fake horizontal synchronization signal and the fake vertical synchronization signal are used as the display configuration; when the touch display panel changes from the dark screen state to the bright screen state, a current display configuration of the touch display panel is reacquired. The timing control method as described in claim 1, wherein the spacing of the touch sensing signals of the touch sensing circuit may be different. A timing control circuit for a touch display device comprises: a timing generator for generating a timing signal similar to a touch display panel of the touch display device; an input stage circuit coupled to a display driving circuit of the touch display device and the timing generator to output at least one of a horizontal synchronization signal, a vertical synchronization signal, and a test enable signal of the touch display panel and output a timing signal similar to the touch display panel; a frame rate detector coupled to the input stage circuit; A circuit for determining a display configuration of the touch display panel according to at least one of the horizontal synchronization signal, the vertical synchronization signal and the test enable signal; and a touch synchronization control circuit for confirming a frame rate of the touch display panel, configuring a touch sensing signal of a touch sensing circuit of the touch display device to have a spacing in timing according to a current frame rate of the touch display panel, and synchronizing the configuration of the touch sensing signal of the touch sensing circuit of the touch display device with the display configuration. The timing control circuit as described in claim 11, wherein the touch synchronization control circuit sets the configuration of the touch sensing signal of the touch sensing circuit to have a spacing in timing, and sets a fixed spacing between the vertical synchronization signal and a pseudo vertical synchronization signal as a reference point for the vertical synchronization signal and the pseudo vertical synchronization signal. The timing control circuit as described in claim 12, wherein the touch synchronization control circuit recalculates the configuration of the touch sensing signal of the touch sensing circuit of the touch display device when the frame rate of the touch display panel is changed; and updates the reference point of the vertical synchronization signal and the pseudo vertical synchronization signal. A timing control circuit as described in claim 11, wherein the touch synchronization control circuit confirms a light or dark state of the touch display panel; when the touch display panel is in a dark screen state, the touch synchronization control circuit determines the display state of the touch display panel using a pseudo horizontal synchronization signal and a pseudo vertical synchronization signal of the touch display panel; and when the touch display panel is in a bright screen state, the touch synchronization control circuit determines the display state of the touch display panel using the horizontal synchronization signal and the vertical synchronization signal of the touch display panel. The timing control circuit as described in claim 14, wherein when the touch display panel is in the dark screen state, the pseudo horizontal synchronization signal and the pseudo vertical synchronization signal are generated by a table lookup method. The timing control circuit as described in claim 14, wherein the pseudo vertical synchronization signal is determined according to a cycle of the horizontal synchronization signal and a pulse number of the horizontal synchronization signal when the touch display panel is in the bright screen state and the frame rate of the touch display panel. The timing control circuit as described in claim 14, wherein the pseudo horizontal synchronization signal is determined according to a cycle of the vertical synchronization signal or the test enable signal of the touch display panel when the touch display panel is in the bright screen state. The timing control circuit as described in claim 14, wherein the pseudo horizontal synchronization signal and the pseudo vertical synchronization signal do not stop when the touch display panel changes from the dark screen state to the bright screen state or from the bright screen state to the dark screen state. The timing control circuit as described in claim 14, wherein when the touch display panel changes from the bright screen state to the dark screen state, the fake horizontal synchronization signal and the fake vertical synchronization signal are used as the display configuration; when the touch display panel changes from the dark screen state to the bright screen state, a current display configuration of the touch display panel is reacquired. A timing control circuit as described in claim 11, wherein the spacing of the touch sensing signals of the touch sensing circuit may be different.

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