TWI837951B - Clock calibration method of touch chip, touch chip and touch display device - Google Patents

Abstract

The present invention provides a clock calibration method of a touch control chip, a touch chip and a touch display device, and relates to the field of touch control. First, the clock cycle corresponding to the current frame synchronization signal frequency of the display screen connected to the touch chip is used as the reference clock cycle of the touch chip, so that the clock calibration of the touch chip is more in line with the standard. Then the real clock in the reference clock cycle is calculated through the counter and the first clock deviation value between the real clock and the theoretical clock is obtained. When the first clock deviation value exceeds the first threshold, it means that the clock of the touch chip is inaccurate. At this time, the counter feeds back the first clock deviation value to the register and calibrates the clock frequency of the touch chip through the register. Therefore, the automatic detection and calibration of the clock can be realized in the form of hardware through counters and registers, and the calibration method is simple and the calibration accuracy is high.

Description

Clock calibration method for touch chip, touch chip and touch display device

The present invention relates to the field of touch control, and in particular to a clock calibration method for a touch chip, a touch chip, and a touch display device.

At present, touch display devices such as smartphones, tablet computers and car appliances have the touch function integrated into the display screen, or the touch screen and display screen work together. The touch chip will scan the screen at a certain frequency to obtain the touch signal. However, refreshing the display screen will cause radiation to the touch function and interfere with the touch effect. The refresh cycle of the display screen is determined by the frequency of vertical synchronization (Vertical Synchronization, Vsync). Therefore, in order for the touch function to work better with the display screen, it is necessary to obtain accurate vertical synchronization and realize self-adjustment of the frame rate according to the changes in vertical synchronization. And vertical synchronization is used as the reference clock source of the touch chip, becoming the standard for calibrating the clock of the touch chip.

The defect of current touch control chips is that they do not have the hardware automatic detection and calibration function of the clock, and can only be realized through software. When the clock frequency deviation is large, the calibration procedure is complicated, the calibration speed is slow and the calibration accuracy is low.

The purpose of the present invention is to provide a touch chip clock calibration method, touch chip and touch display device, which can realize automatic detection and calibration of the clock in the form of hardware through a counter and a register, and the calibration method is simple and the calibration accuracy is high.

In order to solve the above technical problems, the present invention provides a clock calibration method for a touch chip, wherein the touch chip includes a counter and a register; the clock calibration method for the touch chip includes the following steps:

The first step S1: obtain the current frame synchronization signal frequency of the display screen connected to the touch chip. The clock cycle corresponding to the current frame synchronization signal frequency is the frequency cycle, and the frequency cycle is used as the reference clock cycle of the touch chip.

Step 2 S2: Calculate the actual number of clocks of the touch chip in the reference clock cycle through the counter.

The third step S3: Compare the actual number of clocks with the theoretical number of clocks corresponding to the frequency cycle to obtain the first clock deviation value.

Step 4 S4: When the first clock deviation value exceeds the first threshold value, the counter feeds back the first clock deviation value to the register, and calibrates the clock frequency of the touch chip through the register, and uses the calibration result as the clock frequency of the next operation of the touch chip.

The fifth step S5: Calculate the first clock deviation value in M consecutive reference clock cycles. If N consecutive first clock deviation values are all less than the first threshold, it is determined that the clock frequency of the touch chip has been calibrated and stabilized. M and N are both positive integers, and M is greater than or equal to N.

In some embodiments, the fifth step S5 is followed by further performing the following steps:

Step 6 S6: Compare the actual number of clocks after the clock frequency calibration and stabilization in step 5 S5 with the theoretical number of clocks corresponding to the frequency cycle to obtain the second clock deviation value.

Step 7 S7: Based on the second clock deviation value and the preset threshold value, determine whether the current clock frequency of the touch chip is accurate; if the current clock frequency is inaccurate, further select a calibration method, which includes frequency self-adjustment calibration and counter calibration; if the current clock frequency is accurate, no calibration is required.

In some embodiments, the clock frequency of the touch chip is calibrated by the register in the fourth step S4, specifically: when the actual number of clocks is greater than the theoretical number of clocks corresponding to the frequency cycle, the register reduces the output value, so that the current input to the oscillator circuit connected to the output end of the register is reduced, thereby reducing the clock frequency of the touch chip.

When the actual number of clocks is less than the theoretical number of clocks corresponding to the frequency cycle, the register increases the output value, causing the current of the oscillator circuit input connected to the output of the register to increase, thereby increasing the clock frequency of the touch chip.

In some embodiments, the preset thresholds include a second threshold and a fourth threshold with decreasing quantifiers.

When the second clock deviation value is greater than the second threshold, the frequency self-adjustment calibration method is executed.

When the second clock deviation value is greater than the fourth threshold and less than the second threshold, the counter calibration method is executed.

In some embodiments, the frequency self-adjustment calibration method is specifically: traversing the theoretical clock numbers corresponding to each pre-stored frequency cycle, searching for the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5, taking the deviation between the two clock numbers as the third deviation value, and defining the frequency corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5 as the self-adjustment frequency.

When the third deviation value is less than the fifth threshold value, the reference clock cycle of the touch chip is switched to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5.

In some embodiments, executing the frequency self-adjustment calibration method further includes: switching the reference clock cycle of the touch chip to a frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stabilization of the clock frequency calibration in the fifth step S5.

Calculate the first clock deviation value within P consecutive reference clock cycles. If Q consecutive first clock deviation values are all less than the first threshold, it is determined that the clock frequency of the touch chip has been calibrated and stabilized. P and Q are both positive integers, and P is greater than or equal to Q.

In some embodiments, the calibration method in the seventh step S7 further includes executing a software calibration method, and the default threshold value further includes a third threshold value whose quantifier is between the second threshold value and the fourth threshold value.

When the second clock deviation value is greater than the third threshold value and less than the second threshold value, the software calibration method is executed, wherein the software calibration method is executed by modifying the output value of the register through the software program, so that the current input to the oscillation circuit connected to the output end of the register changes, thereby adjusting the clock frequency of the touch chip.

When the second clock deviation value is greater than the fourth threshold and less than the third threshold, the counter calibration method is executed.

To solve the above technical problems, the present invention also provides a touch chip, including a first control module and a regulating module.

The first control module includes a counter, which is used to obtain the actual number of clocks generated by the touch chip in the reference clock cycle through the counter, and trigger the adjustment module when the first clock deviation value between the actual number of clocks and the theoretical number of clocks preset in the corresponding frequency cycle exceeds the first threshold value.

The regulating module includes a register. When the actual number of clocks is greater than the theoretical number of clocks, the regulating module controls the register to reduce the output value, so that the current input to the oscillator circuit connected to the output end of the register is reduced, thereby reducing the oscillation frequency of the oscillator circuit; when the actual number of clocks is less than the theoretical number of clocks, the regulating module controls the register to increase the output value, so that the current input to the oscillator circuit connected to the output end of the register is increased, thereby increasing the oscillation frequency of the oscillator circuit.

In some embodiments, the first control module is also used to obtain the current actual clock number of the touch chip in the reference clock cycle after the adjustment module completes the adjustment.

According to the second clock deviation value between the current actual clock number and the theoretical clock number, it is judged whether the frequency cycle of the reference clock cycle of the touch chip has changed, wherein the frequency cycle is the clock cycle corresponding to the frequency of the frame synchronization signal of the display screen connected to the touch chip.

When the second clock deviation value is greater than the second preset threshold, it is determined that the frequency cycle has changed, and the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number.

In some embodiments, the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number, including: obtaining the frequency after the frame synchronization signal is switched according to the corresponding list of the theoretical clock number corresponding to each frequency cycle according to the current actual clock number, and defining the frequency after the frame synchronization signal is switched as the self-adjusting frequency.

Update the theoretical clock number configuration value of the counter to the theoretical clock number configuration value corresponding to the self-adjusting frequency.

In some embodiments, the regulating module further includes a first MOS transistor, a current mirror module, and X regulating sub-modules, the regulating sub-module includes a second MOS transistor and a third MOS transistor, and X is a positive integer.

The input end of the register is the first input end of the regulating module, the output end of the register is connected to the first control end of the X regulating sub-modules, the input end of the first MOS transistor is the second input end of the regulating module, the output end of the first MOS transistor is grounded, the control end of the first MOS transistor is connected to the input end of the first MOS transistor and the common end connected is connected to the second control end of the X regulating sub-modules one by one, the second ends of the X regulating sub-modules are all grounded, the first ends of the X regulating sub-modules are connected to each other and the common end connected is connected to the input end of the current mirror module, and the output end of the current mirror module is the output end of the current regulating module.

The output end of the second MOS transistor is the first end of the regulating submodule, the control end of the second MOS transistor is the first control end of the regulating submodule, the input end of the second MOS transistor is connected to the input end of the third MOS transistor, the control end of the third MOS transistor is the second control end of the regulating submodule, and the output end of the third MOS transistor is the second end of the regulating submodule.

In some embodiments, the first control module is also used to: When the second clock deviation value is between the second threshold value and the fourth threshold value, the output value of the register is adjusted by the counter so that each regulating submodule outputs the target current output value.

If the actual number of clocks is greater than the theoretical number of clocks, the current adjustment value output by the control register is reduced by the unit adjustment value; if the actual number of clocks is less than the theoretical number of clocks, the current adjustment value output by the control register is increased by the unit adjustment value.

When the second clock deviation value is less than the fourth threshold value, the clock of the touch chip is determined to be accurate.

The second and fourth thresholds decrease in sequence.

In some embodiments, the preset threshold further includes a third threshold whose quantifier is between the second threshold and the fourth threshold.

The first control module is used to: when the second clock deviation value is between the second threshold value and the third threshold value, adjust the output value of the register through software so that each regulating sub-module outputs the target current output value.

When the second clock deviation value is between the third threshold and the fourth threshold, the output value of the register is adjusted through the counter so that each regulating submodule outputs the target current output value.

In some embodiments, the width-to-length ratios between the first MOS transistor and the third MOS transistor in each regulating submodule are different from each other.

In some embodiments, the oscillator circuit includes a first inverter, a second inverter, and M oscillator circuits, the oscillator circuit includes a fourth MOS transistor and a fifth MOS transistor, and M is a positive integer.

The input end of the oscillator circuit is the input end of the oscillator circuit, the output end of the oscillator circuit is connected to the input end of the first inverter, the output end of the first inverter is connected to the input end of the second inverter, and the output end of the second inverter is the output end of the oscillator circuit.

The input ends of the fifth MOS transistors in the M oscillator circuits are connected to each other and the common end is the input end of the oscillator circuit. The control end of the fourth MOS transistor is connected to the control end of the fifth MOS transistor and the common end is the first end of the oscillator circuit. The drain of the fourth MOS transistor is connected to the drain of the fifth MOS transistor and the common end is the second end of the oscillator circuit. The first end and the second end of the M oscillator circuits are connected in series in sequence. The two ends of the series circuits are connected and the common end is the output end of the oscillator circuit.

In order to solve the above technical problems, the present invention also provides a touch display device, including the above touch chip and a display screen connected to the touch chip.

In summary, the present invention provides a touch chip clock calibration method, a touch chip and a touch display device, which first obtains the current frame synchronization signal frequency of the display screen connected to the touch chip, and uses the clock cycle corresponding to the current frame synchronization signal frequency as the reference clock cycle of the touch chip, so that the touch chip clock calibration is more in line with the standard. Then the actual number of clocks in the reference clock cycle is calculated by the counter; the actual number of clocks and the theoretical number of clocks are compared to obtain the first clock deviation value; when the first clock deviation value exceeds the first threshold value, it indicates that the clock of the touch chip is inaccurate. At this time, the counter feeds back the first clock deviation value to the register and calibrates the clock frequency of the touch chip through the register. Finally, the first clock deviation value in M consecutive reference clock cycles is calculated. If the N consecutive first clock deviation values are all less than the first threshold value, it is determined that the clock frequency of the touch chip has been calibrated and stabilized. In summary, the automatic detection and calibration of the clock can be realized in the form of hardware through the counter and register, and the calibration method is simple, the calibration speed is fast and the calibration accuracy is high.

1: Control module

2: Adjustment module

MP1, MP2, MP3: the fourth MOS transistor

MN1, MN2, MN3: Fifth MOS transistor

MN4: First MOS transistor

MN5, MN6, MN7, MN8: The third MOS transistor

MN9, MN10, MN11, MN12: Second MOS transistor

IREF: reference current

TRIM<1>: First current adjustment value

TRIM<2>: Second current regulation value

TRIM<3>: The third current regulation value

TRIM<4>: The fourth current regulation value

IOUT: output current

INV1: First inverter

INV2: Second inverter

S1: First step

S2: Second step

S3: The third step

S4: Step 4

S5: Step 5

S6: Step 6

S7: Step 7

In order to more clearly explain the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the diagrams required for use in the embodiments. Obviously, the diagrams described below are only some embodiments of the present invention. For ordinary technicians in this field, other diagrams can be obtained based on these diagrams without creative labor.

Figure 1 is a flow chart of a clock calibration method for a touch chip provided by the present invention; Figure 2 is a flow chart of another clock calibration method for a touch chip provided by the present invention; Figure 3 is a structural schematic diagram of a clock calibration device for a touch chip provided by the present invention; Figure 4 is a partial circuit diagram of a regulating module provided by the present invention; Figure 5 is a circuit diagram of a regulating module provided by the present invention.

The core of the present invention is to provide a touch chip clock calibration method, a touch chip and a touch display device, which can realize automatic detection and calibration of the clock in the form of hardware through a counter and a register. The calibration method is simple, the calibration speed is fast and the calibration accuracy is high.

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

Please refer to Figure 1, which is a flow chart of a clock calibration method for a touch chip provided by the present invention. The touch chip includes a counter and a register.

The clock calibration method of the touch chip includes the following steps:

The first step S1: obtain the current frame synchronization signal frequency of the display screen connected to the touch chip. The clock cycle corresponding to the current frame synchronization signal frequency is the frequency cycle, and the frequency cycle is used as the reference clock cycle of the touch chip.

During the use of the touch chip, there are temperature drifts and other phenomena that cause inaccurate clocks, and the display screen used with the touch chip will also affect the clock of the touch chip when refreshing the screen. To solve the above technical problems, in this application, it is necessary to use counters and registers to calibrate the clock of the touch chip. First, in order to check whether the clock of the touch chip is accurate, it is necessary to set a reference clock cycle for the touch chip in order to obtain the number of clocks in the reference clock cycle and perform subsequent clock calibration steps. In this application, considering that the frequency of the frame synchronization signal of the display screen is closely related to the performance of the touch chip, the clock cycle corresponding to the frame synchronization signal frequency is used as the reference clock cycle of the touch chip.

Step 2 S2: Calculate the actual number of clocks of the touch chip in the reference clock cycle through the counter.

In this application, the actual number of clocks is calculated by a counter, that is, the actual number of clocks is calculated in the form of hardware, which is more accurate and faster, and further ensures the accuracy of clock calibration.

The third step S3: Compare the actual number of clocks with the theoretical number of clocks corresponding to the frequency cycle to obtain the first clock deviation value.

Before clock calibration, the theoretical number of clocks generated by the oscillator circuit of the touch chip in the reference clock cycle when it is not disturbed is preset in advance to facilitate subsequent clock calibration. After obtaining the actual number of clocks, the actual number of clocks is subtracted from the theoretical number of clocks to obtain the first clock deviation value. The magnitude of the first clock deviation value reflects the degree of deviation of the clock actually generated by the oscillator circuit in the touch chip.

Step 4 S4: When the first clock deviation value exceeds the first threshold value, the counter feeds back the first clock deviation value to the register, and calibrates the clock frequency of the touch chip through the register, and uses the calibration result as the clock frequency of the next operation of the touch chip.

The magnitude of the first clock deviation value reflects the degree of deviation of the clock actually generated by the oscillation circuit in the touch chip. In the present application, a first threshold is pre-set according to the actual situation. When the absolute value of the first clock deviation value exceeds the first threshold, it indicates that the oscillation circuit in the touch chip needs to be calibrated. Therefore, the counter feeds back the first clock deviation value to the register, and calibrates the clock frequency of the touch chip through the register. The specific calibration method can be to change the input current value of the oscillation circuit in the touch chip by modifying the output value of the register. When the input current of the oscillation circuit increases or decreases, the number of clocks generated by the oscillation circuit in the reference clock cycle will also increase or decrease accordingly to achieve the purpose of clock calibration. The calibration result is used as the clock frequency for the next operation of the touch chip, that is, the output value of the register is maintained at the output value when the number of clocks generated by the oscillation circuit meets the standard.

In addition, when implementing the register to calibrate the input value of the oscillator circuit of the touch chip, a regulating circuit can be set between the output end of the register and the circuit input end of the oscillator circuit. The regulating circuit can output a standard current corresponding to the output value of the register, so when the output value of the register is different, the current output by the regulating circuit is also different, thereby achieving the purpose of regulating the input current of the oscillator circuit.

Step 5 S5: Calculate the first clock deviation value in M consecutive reference clock cycles. If N consecutive first clock deviation values are all less than the first threshold, it is determined that the clock frequency of the touch chip has been calibrated and stabilized. M and N are both positive integers, and M is greater than or equal to N.

In order to further ensure that the clock of the touch chip is accurate and stable, after the clock frequency of the touch chip is calibrated through the register, the first clock deviation value in M consecutive reference clock cycles is calculated. If N consecutive first clock deviation values are all less than the first threshold value, it is determined that the clock frequency of the touch chip has been calibrated and stabilized. In summary, this application uses the clock cycle corresponding to the frequency of the current frame synchronization signal, that is, the frequency cycle, as the reference clock cycle of the touch chip, ensuring the accuracy of clock calibration. The actual number of clocks of the touch chip in the reference clock cycle is obtained through a counter. When the first clock deviation value exceeds the first threshold, that is, the clock of the touch chip is inaccurate, the clock frequency of the touch chip is adjusted by modifying the output value of the register. The clock of the touch chip is calibrated in the form of hardware, and the calibration method is simple and the calibration accuracy is high.

Based on the above embodiments: In some embodiments, the following steps are further performed after the fifth step S5:

Step 6 S6: Compare the actual number of clocks after the clock frequency calibration and stabilization in step 5 S5 with the theoretical number of clocks corresponding to the frequency cycle to obtain the second clock deviation value.

Step 7 S7: Based on the second clock deviation value and the preset threshold value, determine whether the current clock frequency of the touch chip is accurate; if the current clock frequency is inaccurate, further select a calibration method, which includes frequency self-adjustment calibration and counter calibration; if the current clock frequency is accurate, no calibration is required.

In this embodiment, considering that the touch chip is not only affected by factors such as temperature drift, but also by the refresh of the display screen connected to the touch chip, and the impact caused by the change in the frequency of the frame synchronization signal is stronger than the impact caused by the temperature drift, it is not feasible to judge whether the clock of the touch chip is accurate according to the original theoretical clock number when the frequency of the frame synchronization signal changes. Therefore, in this embodiment, after the clock frequency calibration, it is necessary to further judge whether the current clock frequency of the touch chip is accurate. If the current clock frequency of the touch chip is still inaccurate, it is necessary to consider whether it is affected by the change in the refresh cycle of the display screen.

Before determining whether the current clock frequency of the touch chip is accurate, a preset threshold is set in advance according to the actual performance of the touch chip. Whether the current clock frequency of the touch chip is accurate can be determined according to the size of the second clock deviation value and the size of the preset threshold. Please refer to Figure 2, which is a flow chart of another touch chip clock calibration method provided by the present invention. If the current clock frequency is inaccurate, a calibration method is further selected, and the calibration method includes frequency self-adjustment calibration and counter calibration. For example, when the current clock frequency is very inaccurate, it is judged that the refresh cycle of the display screen connected to the touch chip may have changed. At this time, the reference clock cycle of the touch chip may need to be modified to achieve clock calibration; when the current clock frequency is only slightly inaccurate, it means that the clock of the touch chip may still be inaccurate due to factors such as temperature drift. In this case, the counter and register can continue to be used for clock calibration; if the current clock frequency is accurate, no calibration is required.

In some embodiments, the clock frequency of the touch chip is calibrated by the register in the fourth step S4, specifically: when the actual number of clocks is greater than the theoretical number of clocks corresponding to the frequency cycle, the register reduces the output value, so that the current input to the oscillator circuit connected to the output end of the register is reduced, thereby reducing the clock frequency of the touch chip.

When the actual number of clocks is less than the theoretical number of clocks corresponding to the frequency cycle, the register increases the output value, causing the current of the oscillator circuit input connected to the output of the register to increase, thereby increasing the clock frequency of the touch chip.

In this embodiment, when the actual number of clocks is greater than the theoretical number of clocks, it means that the clock currently generated by the oscillator circuit is too fast, so the output value of the register is reduced to reduce the input current of the oscillator circuit and then slow down the clock generated by the oscillator circuit to achieve the purpose of clock calibration.

When the actual number of clocks is less than the theoretical number of clocks, it means that the clock currently generated by the oscillator circuit is too slow. Therefore, the output value of the register is increased to increase the input current of the oscillator circuit and thus speed up the clock generated by the oscillator circuit to achieve the purpose of clock calibration.

In some embodiments, the preset thresholds include a second threshold and a fourth threshold with decreasing quantifiers.

When the second clock deviation value is greater than the second threshold, the frequency self-adjustment calibration method is executed.

When the second clock deviation value is greater than the fourth threshold and less than the second threshold, the counter calibration method is executed.

In this embodiment, the second threshold and the fourth threshold are set with decreasing quantifiers in sequence. When the second clock deviation value is greater than the second threshold, it indicates that the clock of the touch chip is relatively inaccurate, and the frequency self-adjustment calibration method needs to be executed to calibrate the clock. The frequency self-adjustment calibration method here is to re-set the number of reference clocks for the touch chip based on the current frame synchronization signal frequency of the display screen.

When the second clock deviation value is greater than the fourth threshold value and less than the second threshold value, it means that the clock inaccuracy of the touch chip is relatively low. At this time, the counter calibration method needs to be executed, that is, the counter and register can continue to be used for clock calibration.

For example, if the frequency of the frame synchronization signal changes while the frequency of the oscillation circuit remains unchanged, the actual number of clocks in the preset time period will change. For the same frame synchronization signal frequency, the theoretical number of clocks is fixed. For example, the frame synchronization signal frequencies currently used are 60HZ, 90HZ, 120HZ and 144HZ, and the theoretical number of clocks corresponding to each frame synchronization signal is 1600000, 1066666, 800000 and 666666 respectively.

If the frequency of the frame synchronization signal changes from 120HZ to 144HZ, the actual number of clocks changes by ((144-120)/120)=16.7%, while the actual number of clocks caused by temperature drift changes by a small amount, usually within 2%. Therefore, when the second deviation value between the actual number of clocks and the theoretical number of clocks changes greatly, it can be determined that the frequency of the frame synchronization signal of the display screen has changed, which means that the reference clock cycle of the touch chip needs to be modified, that is, the frequency self-adjustment calibration is required.

In this embodiment, different calibration methods are selected according to the size of the second clock deviation value, making the clock calibration process faster and more accurate.

In some embodiments, the frequency self-adjustment calibration method is specifically: traversing the theoretical clock numbers corresponding to each pre-stored frequency cycle, searching for the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5, taking the deviation between the two clock numbers as the third deviation value, and defining the frequency corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5 as the self-adjustment frequency.

When the third deviation value is less than the fifth threshold value, the reference clock cycle of the touch chip is switched to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step S5.

In this embodiment, the frequency self-adjustment calibration method is executed, including first traversing the theoretical clock numbers corresponding to each pre-stored frequency cycle, searching for the theoretical clock number with the smallest deviation from the actual clock number corresponding to the clock frequency calibration being stable in the fifth step S5, and obtaining a third deviation value between the actual clock number corresponding to the clock frequency calibration being stable and the theoretical clock number with the smallest deviation among the pre-stored theoretical clock numbers. If the third deviation value is less than the fifth threshold value, the reference clock cycle of the touch chip is switched to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the clock frequency calibration stabilization in the fifth step S5, so as to continue to check whether the clock of the touch chip is accurate.

For example, if the actual number of clocks detected for five consecutive times is very close to the actual number of clocks corresponding to the frequency of a frame synchronization signal, it means that the frame synchronization signal has switched to that frequency and has stabilized. For example, if the actual number of clocks detected for five consecutive times switches from 1599950 to 799950, 1599950 is very close to the theoretical value of 1600000, indicating that the previous frame synchronization signal frequency was 60HZ, and 799950 is very close to the theoretical value of 800000, indicating that the current frame synchronization signal frequency is 120HZ, that is, the frame synchronization signal has switched from 60HZ to 120HZ, and the theoretical number of clocks needs to be set to the number of clocks corresponding to the clock cycle corresponding to 120HZ.

In some embodiments, the frequency self-adjustment calibration method further includes: after switching the reference clock cycle of the touch chip to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the clock frequency calibration stability in the fifth step S5, calculating the first clock deviation value in P consecutive reference clock cycles, if the consecutive Q first clock deviation values are all less than the first threshold value, it is determined that the clock frequency of the touch chip has been calibrated and stabilized, P and Q are both positive integers, and P is greater than or equal to Q.

In this embodiment, in order to further ensure the accuracy of clock calibration, after switching the reference clock cycle of the touch chip to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the clock frequency calibration stabilization in the fifth step S5, the first clock deviation value is calculated continuously for P times. If Q first clock deviation values are all less than the first threshold value, it means that the clock of the current touch chip has been calibrated, which further ensures the accuracy of clock calibration.

In addition, this application does not impose any special restrictions on the specific values of P and Q, which can be set according to actual circumstances.

In some embodiments, the calibration method in the seventh step S7 further includes executing a software calibration method, and the default threshold value further includes a third threshold value whose quantifier is between the second threshold value and the fourth threshold value.

When the second clock deviation value is greater than the third threshold value and less than the second threshold value, the software calibration method is executed, wherein the software calibration method is executed by modifying the output value of the register through the software program, so that the current input to the oscillation circuit connected to the output end of the register changes, thereby adjusting the clock frequency of the touch chip.

When the second clock deviation value is greater than the fourth threshold and less than the third threshold, the counter calibration method is executed.

In this embodiment, the accuracy of counter calibration is higher than that of directly using software to calibrate registers, but the calibration speed is slow. Therefore, when the error is large, software calibration is used, which is fast; when the error is small, counter calibration is used, which is high in accuracy.

Specifically, a third threshold between the second threshold and the fourth threshold is preset. When the second clock deviation value is greater than the third threshold and less than the second threshold, it indicates that the current clock of the touch chip is relatively inaccurate, so the software calibration method is executed, specifically, the output value of the register is modified by the software program, so that the current input of the oscillation circuit connected to the output end of the register changes, thereby adjusting the clock frequency of the touch chip. When the second clock deviation value is greater than the fourth threshold and less than the third threshold, it indicates that the current clock of the touch chip is relatively inaccurate, and the counter calibration method is executed, with high calibration accuracy.

Please refer to Figure 3, which is a schematic diagram of the structure of a clock calibration device for a touch chip provided by the present invention. The touch chip includes a control module 1 and an adjustment module 2.

Control module 1 includes a counter, which is used to obtain the actual number of clocks generated by the touch chip in the reference clock cycle through the counter, and trigger the adjustment module 2 when the first clock deviation value between the actual number of clocks and the theoretical number of clocks preset in the corresponding frequency cycle exceeds the first threshold value.

The regulating module 2 includes a register. When the actual number of clocks is greater than the theoretical number of clocks, the regulating module 2 is used to control the register to reduce the output value, so that the current input to the oscillation circuit connected to the output end of the register is reduced, thereby reducing the oscillation frequency of the oscillation circuit; when the actual number of clocks is less than the theoretical number of clocks, the regulating module 2 is used to control the register to increase the output value, so that the current input to the oscillation circuit connected to the output end of the register is increased, thereby increasing the oscillation frequency of the oscillation circuit.

In this embodiment, the touch chip includes a control module 1 and a regulating module 2. First, the control module 1 obtains the actual number of clocks generated by the oscillator circuit in the touch chip for generating the clock in the reference clock cycle through a counter. Before clock calibration, the theoretical number of clocks and the first threshold are set according to the actual situation of the touch chip. After obtaining the actual number of clocks, the actual number of clocks is subtracted from the theoretical number of clocks to obtain the first clock deviation value. If the first clock deviation value exceeds the first threshold value, it means that the clock generated by the oscillator circuit is inaccurate at this time and clock calibration is required, so the control module 1 will trigger the regulating module 2.

When the actual number of clocks is greater than the theoretical number of clocks, it means that the clock currently generated by the oscillator circuit is too fast. Therefore, the adjustment module 2 reduces the input current of the oscillator circuit through the register and slows down the clock generated by the oscillator circuit to achieve the purpose of clock calibration.

When the actual number of clocks is less than the theoretical number of clocks, it means that the clock currently generated by the oscillator circuit is too slow. Therefore, the adjustment module 2 increases the input current of the oscillator circuit through the register and speeds up the clock generated by the oscillator circuit to achieve the purpose of clock calibration.

The specific adjustment value of the input current of the oscillating circuit by the adjustment module 2 can be a preset unit modulation value, that is, each time the adjustment module 2 is triggered, the input current of the oscillating circuit is reduced by one gear or increased by one gear unit, and the first difference is kept within the preset error range after multiple adjustments by the adjustment module 2; or the specific modulation value can be set according to the first difference between the actual number of clocks and the theoretical number of clocks, so that the adjustment module 2 can keep the first difference within the preset error range as long as it is triggered once.

In addition, this application does not specifically limit the specific values of the theoretical clock number and the preset error range, and can be set according to actual circumstances.

In some embodiments, the control module 1 is also used to obtain the current actual clock number of the touch chip in the reference clock cycle after the adjustment module 2 completes the adjustment.

According to the second clock deviation value between the current actual clock number and the theoretical clock number, it is judged whether the frequency cycle of the reference clock cycle of the touch chip has changed, wherein the frequency cycle is the clock cycle corresponding to the frequency of the frame synchronization signal of the display screen connected to the touch chip.

When the second clock deviation value is greater than the second preset threshold, it is determined that the frequency cycle has changed, and the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number.

Considering that when the display screen connected to the touch chip is refreshed, the clock of the touch chip will also be affected, and the refresh cycle of the display screen is related to the frequency of the frame synchronization signal, and the impact caused by the frequency change of the frame synchronization signal is stronger than the impact caused by temperature drift, and the clock inaccuracy caused by the frequency change of the frame synchronization signal is more obvious. The reference clock cycle of the touch chip in this application is the adopted frequency cycle. Therefore, in this embodiment, it is necessary to determine whether the frequency cycle of the reference clock cycle of the touch chip has changed to avoid adverse effects on normal clock calibration.

Before judging whether the frequency cycle of the reference clock cycle of the touch chip has changed, the theoretical clock number and the second clock deviation value are set in advance according to the actual performance of the touch chip. The frequency cycle of the reference clock cycle of the touch chip can be judged according to the size of the second clock deviation value. When the second clock deviation value is greater than the second threshold value, it is judged that the frequency cycle has changed, and the oscillation circuit is switched to the frequency corresponding to the theoretical clock number and the current actual clock number.

In addition, whether the adjustment module 2 has completed the adjustment can be determined by judging the stability of the actual number of clocks. For example, the actual number of clocks is obtained in 5 consecutive preset time periods, and the difference between each actual number of clocks and the theoretical number of clocks is calculated respectively. Only when all 5 differences are less than the preset value can it be determined that the adjustment module 2 has completed the adjustment.

In some embodiments, the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number, including: According to the corresponding list of the theoretical clock number corresponding to the current actual clock number and each frequency cycle, the frequency after the frame synchronization signal is switched is obtained, and the frequency after the frame synchronization signal is switched is defined as the self-adjusting frequency.

Update the theoretical clock number configuration value of the counter to the theoretical clock number configuration value corresponding to the self-adjusting frequency.

In this embodiment, a theoretical clock number correspondence list is pre-set, and the theoretical clock number correspondence list includes the correspondence between the clock number and the frame synchronization signal frequency. After obtaining the actual clock number, the actual clock number is compared with each clock number in the theoretical clock number correspondence list to determine the frequency after the frame synchronization signal is switched, and the frequency after the frame synchronization signal is switched is defined as the self-adjusting frequency and the theoretical clock number of the counter is switched to the theoretical clock number corresponding to the self-adjusting frequency, so as to calibrate the clock of the touch chip again to ensure the stable operation of the touch chip.

In some embodiments, the regulating module 2 further includes a first MOS transistor, a current mirror module and X regulating sub-modules, the regulating sub-module includes a second MOS transistor and a third MOS transistor, and X is a positive integer.

The input end of the register is the first input end of the regulating module 2, the output end of the register is connected to the first control end of the X regulating sub-modules, the input end of the first MOS transistor is the second input end of the regulating module 2, the output end of the first MOS transistor is grounded, the control end of the first MOS transistor is connected to the input end of the first MOS transistor and the common end connected is connected to the second control end of the X regulating sub-modules one by one, the second ends of the X regulating sub-modules are all grounded, the first ends of the X regulating sub-modules are connected to each other and the common end connected is connected to the input end of the current mirror module, and the output end of the current mirror module is the output end of the current regulating module 2.

The output end of the second MOS transistor is the first end of the regulating submodule, the control end of the second MOS transistor is the first control end of the regulating submodule, the input end of the second MOS transistor is connected to the input end of the third MOS transistor, the control end of the third MOS transistor is the second control end of the regulating submodule, and the output end of the third MOS transistor is the second end of the regulating submodule.

In this embodiment, the register outputs a current adjustment value with X bits, and each bit of the current adjustment value corresponds to controlling whether a regulating submodule outputs current. The sum of the output currents of each regulating submodule is the current input to the oscillator circuit by the regulating module 2. Therefore, when the current value output by the register decreases, the current output by the regulating module 2 to the oscillator circuit will decrease, thereby achieving the purpose of reducing the number of actual clocks generated by the oscillator circuit in the reference clock cycle.

In some embodiments, the input terminal of the first MOS transistor is used to input a reference current, and the third MOS transistor in each regulating submodule constitutes a common gate and common source current mirror, so that the output current of each regulating submodule is proportional to the reference current, and finally the current mirror module outputs the sum of the output currents of N regulating submodules to the oscillator circuit to calibrate the clock generated by the oscillator circuit.

Please refer to Figure 4, which is a partial circuit diagram of a regulating module provided by the present invention. In Figure 4, MN4 is the first MOS transistor, IREF is the reference current, MN9 and MN5, MN10 and MN6, MN11 and MN7, and MN12 and MN8 respectively constitute four regulating sub-modules, wherein MN9, MN10, MN11 and MN12 are all second MOS transistors, MN5, MN6, MN7 and MN8 are all third MOS transistors, TRIM is the current regulation value with 4 bits output by the register, TRIM<0> to TRIM<3> represent the first to fourth bits of TRIM, and IOUT is the sum of the output currents of the four regulating sub-modules.

Please refer to Figure 5, which is a circuit diagram of a regulating module provided by the present invention. The output module in Figure 5 is the circuit shown in Figure 4, and MP4 and MP5 constitute a current mirror module.

In some embodiments, the control module 1 is also used to: when the second clock deviation value is between the second threshold value and the fourth threshold value, adjust the output value of the register through the counter so that each regulating submodule outputs the target current output value.

If the actual number of clocks is greater than the theoretical number of clocks, the current adjustment value output by the control register is reduced by the unit adjustment value; if the actual number of clocks is less than the theoretical number of clocks, the current adjustment value output by the control register is increased by the unit adjustment value.

When the second clock deviation value is less than the fourth threshold value, the clock of the touch chip is determined to be accurate.

The second threshold and the fourth threshold decrease in sequence. In this embodiment, if the second clock deviation value is between the second threshold and the fourth threshold, it means that the clock is inaccurate, and the output value of the register needs to be adjusted through the counter so that each regulating submodule outputs the target current output value. Specifically, if the actual number of clocks is greater than the theoretical number of clocks, the current adjustment value output by the control register is reduced by the unit adjustment value, thereby reducing the number of clocks generated by the oscillation circuit; if the actual number of clocks is less than the theoretical number of clocks, the current adjustment value output by the control register is increased by the unit adjustment value, thereby increasing the number of clocks generated by the oscillation circuit.

If the second clock deviation value is less than the fourth threshold value, it means that the actual clock number is not much different from the theoretical clock number, and the touch chip clock is judged to be accurate.

In summary, in this embodiment, the accuracy of the clock of the touch chip is determined based on the specific deviation of the second clock deviation value, and the corresponding clock calibration method is selected to ensure the accuracy of the clock calibration.

In some embodiments, the preset threshold further includes a third threshold whose quantifier is between the second threshold and the fourth threshold.

Control module 1 is used to: when the second clock deviation value is between the second threshold value and the third threshold value, adjust the output value of the register through software so that each regulating sub-module outputs the target current output value.

When the second clock deviation value is between the third threshold and the fourth threshold, the output value of the register is adjusted through the counter so that each regulating submodule outputs the target current output value.

In this embodiment, considering the inaccuracy of the clock, the most appropriate calibration method can be further selected according to the degree of the clock inaccuracy. Considering that the accuracy of counter calibration is higher than that of directly writing register calibration with software, but the speed is slow, software calibration can be selected when the error is large, and counter calibration can be selected when the error is small.

Specifically, when the second clock deviation value is between the second threshold value and the third threshold value, it indicates that the clock is relatively inaccurate. The output value of the register is adjusted by the software so that each regulating submodule outputs the target current output value. When the second clock deviation value is between the third threshold value and the fourth threshold value, it indicates that the clock deviation is small. The output value of the register is adjusted by the counter so that each regulating submodule outputs the target current output value.

In some embodiments, the width-to-length ratios between the first MOS transistor and the third MOS transistor in each regulating submodule are different from each other.

The first MOS transistor and the third MOS transistor form a common gate and common source current mirror. The ratio between the output current of the first MOS transistor and the output current of the third MOS transistor is determined by the width-to-length ratio of the two. In this embodiment, the width-to-length ratios between the first MOS transistor and the third MOS transistor in each regulating sub-module are different from each other. Therefore, by changing the current regulation value output by the second control module, the input current of the oscillation circuit can be regulated to different degrees, and the regulation method is more flexible and the regulation range is larger.

In some embodiments, the oscillator circuit includes a first inverter, a second inverter, and M oscillator circuits, the oscillator circuit includes a fourth MOS transistor and a fifth MOS transistor, and M is a positive integer.

The input end of the oscillator circuit is the input end of the oscillator circuit, the output end of the oscillator circuit is connected to the input end of the first inverter, the output end of the first inverter is connected to the input end of the second inverter, and the output end of the second inverter is the output end of the oscillator circuit.

The input ends of the fifth MOS transistors in the M oscillator circuits are connected to each other and the common end is the input end of the oscillator circuit. The control end of the fourth MOS transistor is connected to the control end of the fifth MOS transistor and the common end is the first end of the oscillator circuit. The drain of the fourth MOS transistor is connected to the drain of the fifth MOS transistor and the common end is the second end of the oscillator circuit. The first end and the second end of the M oscillator circuits are connected in series in sequence. The two ends of the series circuits are connected and the common end is the output end of the oscillator circuit.

Please refer to FIG. 5, which is a circuit diagram of a regulating module provided by the present invention. In FIG. 5, MP1 and MN1, MP2 and MN2, and MP3 and MN3 respectively constitute three oscillator circuits, wherein MP1, MP2, and MP3 are fourth MOS transistors, MN1, MN2, and MN3 are fifth MOS transistors, INV1 is the first inverter, and INV2 is the second inverter.

The present invention also provides a touch display device, including the above-mentioned touch chip and a display screen connected to the touch chip.

For the relevant introduction of the touch display device provided by the present invention, please refer to the above-mentioned embodiments of the touch chip and the control method of the touch chip, which will not be elaborated here.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, please refer to the method part.

It should also be noted that in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. In the absence of more restrictions, the elements defined by the phrase "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or apparatus including the elements.

S1~S5: Steps

Claims (16)

A clock calibration method for a touch chip, wherein the touch chip includes a counter and a register; the clock calibration method for the touch chip includes the following steps: a first step: obtaining a current frame synchronization signal frequency of a display screen connected to the touch chip, a clock cycle corresponding to the current frame synchronization signal frequency is a frequency cycle, and the frequency cycle is used as a reference clock cycle of the touch chip; a second step: calculating an actual clock number of the touch chip in the reference clock cycle by the counter; a third step: comparing the actual clock number with a theoretical clock number corresponding to the frequency cycle; According to the number of clocks, a first clock deviation value is obtained; the fourth step: when the first clock deviation value exceeds a first threshold value, the counter feeds back the first clock deviation value to the register, and calibrates the clock frequency of the touch chip through the register, and uses the calibration result as the clock frequency of the next operation of the touch chip; and the fifth step: calculate the first clock deviation value in M consecutive reference clock cycles, if N consecutive first clock deviation values are all less than the first threshold value, it is determined that the clock frequency of the touch chip has been calibrated and stabilized, M and N are both positive integers, and M is greater than or equal to N. The clock calibration method of the touch chip as described in claim 1, wherein the following steps are further performed after the fifth step: the sixth step: comparing the actual number of clocks after the clock frequency calibration and stabilization in the fifth step with the theoretical number of clocks corresponding to the frequency cycle to obtain a second clock deviation value; and the seventh step: judging whether a current clock frequency of the touch chip is accurate based on the second clock deviation value and a preset threshold value; if the current clock frequency is inaccurate, further selecting a calibration method, the calibration method including a frequency self-adjustment calibration method and a counter calibration method; if the current clock frequency is accurate, no calibration is required. The clock calibration method of the touch chip as described in claim 1 or 2, wherein the clock frequency of the touch chip is calibrated by the register in the fourth step, specifically: when the actual clock number is greater than the theoretical clock number corresponding to the frequency cycle, the register reduces the output value, so that the current input to an oscillating circuit connected to the output end of the register is reduced, thereby reducing the clock frequency of the touch chip; and when the actual clock number is less than the theoretical clock number corresponding to the frequency cycle, the register increases the output value, so that the current input to the oscillating circuit connected to the output end of the register is increased, thereby increasing the clock frequency of the touch chip. A clock calibration method for a touch chip as described in claim 2, wherein the preset threshold value includes a second threshold value and a fourth threshold value whose quantifiers decrease in sequence; when the second clock deviation value is greater than the second threshold value, the frequency self-adjustment calibration method is executed; and when the second clock deviation value is greater than the fourth threshold value and less than the second threshold value, the counter calibration method is executed. The clock calibration method of the touch chip as described in claim 4, wherein the execution of the frequency self-adjustment calibration method is specifically: traversing the theoretical clock numbers corresponding to each pre-stored frequency cycle, searching for the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable clock frequency calibration in the fifth step, taking the deviation between the two clock numbers as a third deviation value, and comparing it with the fifth step. The frequency corresponding to the theoretical number of clocks with the smallest deviation from the actual number of clocks corresponding to the stable clock frequency calibration in the step is defined as a self-adjusting frequency; and when the third deviation value is less than a fifth threshold value, the reference clock cycle of the touch chip is switched to the frequency cycle corresponding to the theoretical number of clocks with the smallest deviation from the actual number of clocks corresponding to the stable clock frequency calibration in the fifth step. The clock calibration method of the touch chip as described in claim 5, wherein the execution of the frequency self-adjustment calibration method further includes: switching the reference clock cycle of the touch chip to the frequency cycle corresponding to the theoretical clock number with the smallest deviation from the actual clock number corresponding to the stable calibration of the clock frequency in the fifth step, and calculating the first clock deviation value in P consecutive reference clock cycles, if the consecutive Q first clock deviation values are all less than the first threshold value, it is determined that the clock frequency of the touch chip has been calibrated and stabilized, P and Q are both positive integers, and P is greater than or equal to Q. The clock calibration method of the touch chip as described in claim 4, wherein: the calibration method in the seventh step also includes an execution software calibration method, the preset threshold value also includes a third threshold value whose quantifier is between the second threshold value and the fourth threshold value; when the second clock deviation value is greater than the third threshold value and less than the second threshold value, the software calibration method is executed, wherein the execution software calibration method is to modify the output value of the register through a software program so that the current input to the oscillation circuit connected to the output end of the register changes, thereby adjusting the clock frequency of the touch chip; and when the second clock deviation value is greater than the fourth threshold value and less than the third threshold value, the counter calibration method is executed. A touch chip, comprising an oscillating circuit, a first control module and a regulating module; the first control module comprises a counter, the first control module is used to obtain an actual clock number generated by the touch chip in a reference clock cycle through the counter, and trigger the regulating module when a first clock deviation value between the actual clock number and a theoretical clock number preset corresponding to a frequency cycle exceeds a first threshold value; and the regulating module comprises a register, the The regulating module is used to control the register to reduce the output value when the actual clock number is greater than the theoretical clock number, so that the current input to the oscillator circuit connected to the output end of the register is reduced, thereby reducing an oscillation frequency of the oscillator circuit; when the actual clock number is less than the theoretical clock number, the register is controlled to increase the output value, so that the current input to the oscillator circuit connected to the output end of the register is increased, thereby increasing the oscillation frequency of the oscillator circuit. The touch chip as described in claim 8, wherein the first control module is further used to: obtain a current actual clock number of the touch chip in the reference clock cycle after the adjustment module completes the adjustment; and determine the frequency of the reference clock cycle of the touch chip according to a second clock deviation value between the current actual clock number and the theoretical clock number. Whether the frequency cycle has changed, wherein the frequency cycle is a clock cycle corresponding to the frequency of a frame synchronization signal of a display screen connected to the touch chip; and when the second clock deviation value is greater than a second threshold value, it is judged that the frequency cycle has changed, and the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number. The touch chip as described in claim 9, wherein the theoretical clock number of the counter is switched to the frequency corresponding to the current actual clock number, including: obtaining the frequency after the frame synchronization signal is switched according to the corresponding list of the theoretical clock number corresponding to each frequency cycle of the current actual clock number, defining the frequency after the frame synchronization signal is switched as a self-adjusting frequency; and updating a theoretical clock number configuration value of the counter to a theoretical clock number configuration value corresponding to the self-adjusting frequency. A touch chip as described in any one of claims 9 to 10, wherein the regulating module further includes a first MOS transistor, a current mirror module and X regulating sub-modules, the regulating sub-module includes a second MOS transistor and a third MOS transistor, and X is a positive integer; the input end of the register is a first input end of the regulating module, the output end of the register is connected to a first control end of the X regulating sub-modules, the input end of the first MOS transistor is a second input end of the regulating module, the output end of the first MOS transistor is grounded, the control end of the first MOS transistor is connected to the input end of the first MOS transistor and the common end of the connection is connected to a first control end of the X regulating sub-modules. The second control ends are connected one by one, the second ends of the X regulating sub-modules are all grounded, the first ends of the X regulating sub-modules are connected to each other and the common end connected is the input end of the current mirror module, and the output end of the current mirror module is the output end of the regulating module; and the output end of the second MOS transistor is the first end of the regulating sub-module, the control end of the second MOS transistor is the first control end of the regulating sub-module, the input end of the second MOS transistor is connected to the input end of the third MOS transistor, the control end of the third MOS transistor is the second control end of the regulating sub-module, and the output end of the third MOS transistor is the second end of the regulating sub-module. A touch chip as described in claim 11, wherein the first control module is further used to: when the second clock deviation value is between the second threshold value and a fourth threshold value, adjust the output value of the register through the counter so that each of the regulating submodules outputs a target current output value; if the actual clock number is greater than the theoretical clock number, control a current adjustment value output by the register to decrease by a unit adjustment value; if the actual clock number is less than the theoretical clock number, control the current adjustment value output by the register to increase by the unit adjustment value; when the second clock deviation value is less than the fourth threshold value, determine that the clock of the touch chip is accurate; and the second threshold value and the fourth threshold value decrease in sequence. A touch control chip as described in claim 12, wherein the first control module is used to: when the second clock deviation value is between the second threshold value and a third threshold value, adjust the output value of the register through software so that each of the regulating submodules outputs the target current output value, and the third threshold value is between the second threshold value and the fourth threshold value; and when the second clock deviation value is between the third threshold value and the fourth threshold value, adjust the output value of the register through the counter so that each of the regulating submodules outputs the target current output value. A touch control chip as described in claim 13, wherein the width-to-length ratios between the first MOS transistor and the third MOS transistor in each of the regulating submodules are different from each other. A touch chip as described in claim 11, wherein the oscillator circuit includes a first inverter, a second inverter and M oscillator circuits, the oscillator circuit includes a fourth MOS transistor and a fifth MOS transistor, and M is a positive integer; the input end of the oscillator circuit is the input end of the oscillator circuit, the output end of the oscillator circuit is connected to the input end of the first inverter, the output end of the first inverter is connected to the input end of the second inverter, and the output end of the second inverter is the output end of the oscillator circuit; and the fifth MOS transistor in the M oscillator circuits is connected to the fifth MOS transistor. The input ends of the MOS transistors are connected to each other and the common end is the input end of the oscillator circuit. The control end of the fourth MOS transistor is connected to the control end of the fifth MOS transistor and the common end is the first end of the oscillator circuit. The drain of the fourth MOS transistor is connected to the drain of the fifth MOS transistor and the common end is the second end of the oscillator circuit. The first end and the second end of the M oscillator circuits are connected in series in sequence. The two ends of the series-connected circuits are connected and the common end is the output end of the oscillator circuit. A touch display device, including the touch chip of claim 8 and a display screen connected to the touch chip, or including the touch chip and the display screen of any one of claims 9 to 15.

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