Touch controller integrated circuit, touch control driving apparatus and vehicle-mounted touch control screen

Abstract

Provided in the embodiments of the present application are a touch controller integrated circuit, a touch control driving apparatus and a vehicle-mounted touch control screen. An output end of the touch controller integrated circuit is connected to a filtering module, and the output end of the touch controller integrated circuit outputs a driving square-wave signal, wherein the output end of the touch controller integrated circuit comprises pins of the touch controller integrated circuit. The filtering module receives the driving square-wave signal and performs filtering processing on the driving square-wave signal, so as to output a touch control driving signal of a sinusoidal waveform. The touch controller integrated circuit provided by the present application can generate a touch control driving signal of a sinusoidal waveform, thus producing less electromagnetic radiation interference compared with using a square wave signal to perform driving in the prior art, such that electromagnetic radiation interference of a vehicle-mounted touch control screen can satisfy automotive standards.

Description

Touch chips, touch driver devices, and vehicle-mounted touch screens Technical Field

[0001] The embodiments of the present application relate to the field of electrical engineering technology, and in particular to a touch chip, a touch drive device, and a vehicle-mounted touch screen. Background Art

[0002] As a means of transportation, cars have brought great convenience to people's lives and work. With the increase in electric vehicle production, in-car touch screens have gradually become the mainstream of the market. Drivers and passengers can operate the in-car touch screens to play music, select ambient lights, map navigation and other functions to meet diverse needs.

[0003] Currently, the driving signal sent by the touch chip included in the vehicle-mounted touch screen to the driving electrode is a square wave signal, so that the vehicle-mounted touch screen receives the user's touch command.

[0004] However, since the square wave has rich harmonic components and high energy, the electromagnetic radiation interference generated when the driving electrodes of the vehicle-mounted touch screen are driven is high and cannot meet vehicle regulations.

[0005] Summary of the Invention

[0006] In view of this, embodiments of the present application provide a touch chip, a touch driving device, and a vehicle-mounted touch screen to at least partially solve the above-mentioned problems.

[0007] According to a first aspect of an embodiment of the present application, a touch chip is provided, wherein an output end of the touch chip is connected to a filtering module; the output end of the touch chip outputs a driving square wave signal, wherein the output end of the touch chip includes a pin of the touch chip; the filtering module receives the driving square wave signal, filters the driving square wave signal, and outputs a touch driving signal with a sine wave waveform.

[0008] In one possible implementation, the pins of the touch chip include a first pin and a second pin, the filtering module includes a first filtering module, and the first filtering module includes a first inductor and a first capacitor; the first end of the first inductor is connected to the first pin, the second end of the first inductor is simultaneously connected to the first end of the first capacitor and the second pin, and the second end of the first capacitor is grounded.

[0009] In one possible implementation, the first end of the first inductor serves as the input end of the first filtering module, for receiving the driving square wave signal; and the second end of the first inductor serves as the output end of the first filtering module, for outputting the touch driving signal with the sine wave waveform.

[0010] In one possible implementation, the pins of the touch control chip include a third pin and a fourth pin, the filtering module further includes a second filtering module, and the second filtering module includes a second inductor and a second capacitor; the first end of the second inductor is connected to the third pin, the second end of the second inductor is simultaneously connected to the first end of the second capacitor and the fourth pin, and the second end of the second capacitor is grounded.

[0011] In a possible implementation, the touch control chip outputs the driving square wave signals with opposite phases to the first filtering module and the second filtering module, and the first filtering module and the second filtering module output the touch control driving signals with opposite phases.

[0012] In one possible implementation, the pins of the touch chip include a fifth pin; the fifth pin outputs the touch drive signal with the sine wave waveform to the drive electrode; wherein the drive electrode is a horizontal electrode and / or a vertical electrode arranged on the touch screen or touch pad.

[0013] In a possible implementation, the touch control chip includes multiple switch groups and multiple fifth pins, and different switch groups are connected to different fifth pins.

[0014] In one possible implementation, the switch group includes a first switch, a second switch, and a third switch; a first end of the first switch in the switch group is connected to the second pin, a first end of the second switch in the switch group is connected to the fourth pin, a first end of the third switch in the switch group is grounded, and second ends of the first, second, and third switches in the same switch group are connected to the same fifth pin.

[0015] In one possible implementation, the touch chip includes: a first variable resistor and a second variable resistor; one end of the first variable resistor is connected to the first pin, and one end of the second variable resistor is connected to the third pin; the first variable resistor is used to adjust the Q value of the first filtering module; the second variable resistor is used to adjust the Q value of the second filtering module.

[0016] In one possible implementation, the touch control chip includes: a signal generation module and a signal amplification module; the signal generation module is used to generate a reference square wave signal based on a sine wave signal and a sawtooth carrier signal, and transmit the reference square wave signal to the signal amplification module; the signal amplification module is used to amplify the reference square wave signal to obtain the driving square wave signal.

[0017] In a possible implementation, the touch chip further includes: an inverter; the number of the signal amplification modules is two, and the two signal amplification modules include a first signal amplification module and a second signal amplification module; the output end of the signal generation module is simultaneously connected to the input end of the inverter and the input end of the first signal amplification module, the output end of the inverter is connected to the input end of the second signal amplification module, the output end of the first signal amplification module is connected to the first pin block, and the output end of the second signal amplification module is connected to the third pin; the inverter is used to invert the first reference square wave signal generated by the signal generation module to obtain a signal that is in phase with the first reference square wave signal. The first signal amplifying module is configured to amplify the first reference square wave signal to obtain a first driving square wave signal; the second signal amplifying module is configured to amplify the second reference square wave signal to obtain a second driving square wave signal with a phase opposite to that of the first driving square wave signal; the first filtering module is configured to filter the first driving square wave signal to obtain a first touch driving signal with a sinusoidal waveform; and the second filtering module is configured to filter the second driving square wave signal to obtain a second touch driving signal with a phase opposite to that of the first touch driving signal.

[0018] In a possible implementation, the number of the signal generating modules is two, and the two signal generating modules include a first signal generating module and a second signal generating module. The number of the signal amplifying modules is two, and the two signal amplifying modules include a third signal amplifying module and a fourth signal amplifying module. The first signal generating module is connected to the third signal amplifying module, and the second signal generating module is connected to the fourth signal amplifying module. The third signal amplifying module is connected to the first pin, and the fourth signal amplifying module is connected to the third pin. The first signal generating module is used to generate a third reference square wave signal based on a sine wave signal and a sawtooth carrier signal, and transmit the third reference square wave signal to the third signal amplifying module. The second signal generation module is configured to generate a fourth reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the fourth reference square wave signal to the fourth signal amplification module. The third signal amplification module is configured to amplify the third reference square wave signal to obtain a third driving square wave signal. The fourth signal amplification module is configured to amplify the fourth reference square wave signal to obtain a fourth driving square wave signal having a phase opposite to that of the third driving square wave signal. The first filtering module is configured to filter the third driving square wave signal to obtain a third touch driving signal having a sine wave waveform. The second filtering module is configured to filter the fourth driving square wave signal to obtain a fourth touch driving signal having a phase opposite to that of the third touch driving signal.

[0019] In a possible implementation, the signal amplification module includes a first resistor, a second resistor, a third capacitor, a fourth capacitor, a first switching tube and a second switching tube; one end of the first resistor is connected to the output end of the signal generation module, the other end of the first resistor is simultaneously connected to one end of the third capacitor and the control end of the first switching tube, the other end of the third capacitor is grounded, the input end of the first switching tube is connected to a first power supply, and the output end of the first switching tube is connected to the filtering module; one end of the second resistor is connected to the output end of the signal generation module, the other end of the second resistor is simultaneously connected to one end of the fourth capacitor and the control end of the second switching tube, the other end of the fourth capacitor is grounded, the input end of the second switching tube is grounded, and the output end of the second switching tube is connected to the filtering module.

[0020] In one possible implementation, the signal amplification module includes two signal amplification branches, a fourth switch, a fifth switch, and a digital control unit; the two signal amplification branches are connected to the signal generation module; the two signal amplification branches include a first signal amplification branch and a second signal amplification branch, and the signal generation module is simultaneously connected to the first signal amplification branch and the second signal amplification branch; the first signal amplification branch is connected to the second power supply through the fourth switch, and the second signal amplification branch is connected to the third power supply through the fifth switch, the fourth switch and the fifth switch are connected to the digital control unit, and the second power supply and the third power supply output voltages of opposite phases; the signal amplification branch is used to amplify the reference square wave signal to obtain a driving square wave signal, wherein the first signal amplification branch and the second signal amplification branch output driving square wave signals of opposite phases; the digital control unit is used to control one of the fourth switch and the fifth switch to be turned on, wherein when the fourth switch is turned on, the second power supply supplies power to the first signal amplification branch, and when the fifth switch is turned on, the third power supply supplies power to the second signal amplification branch.

[0021] In a possible implementation, the first signal amplifying branch includes a third resistor, a fourth resistor, a fifth capacitor, a sixth capacitor, a third switch tube and a fourth switch tube; one end of the third resistor is connected to the output end of the signal generating module, the other end of the third resistor is simultaneously connected to one end of the fifth capacitor and the control end of the third switch tube, the other end of the fifth capacitor is grounded, and the input end of the third switch tube is connected to the first switch; one end of the fourth resistor is connected to the output end of the signal generating module, the other end of the fourth resistor is simultaneously connected to one end of the sixth capacitor and the control end of the fourth switch tube, the other end of the sixth capacitor is grounded, and the input end of the fourth switch tube is grounded; the second signal amplifying branch includes the fifth resistor a resistor, a sixth resistor, a seventh capacitor, an eighth capacitor, a fifth switching tube and a sixth switching tube; one end of the fifth resistor is connected to the output end of the signal generating module, the other end of the fifth resistor is simultaneously connected to one end of the seventh capacitor and the control end of the fifth switching tube, the other end of the seventh capacitor is grounded, the input end of the fifth switching tube is connected to the second switch, and the output end of the fifth switching tube is connected to the filtering module; one end of the sixth resistor is connected to the output end of the signal generating module, the other end of the sixth resistor is simultaneously connected to one end of the eighth capacitor and the control end of the sixth switching tube, the other end of the eighth capacitor is grounded, the input end of the sixth switching tube is grounded, and the output end of the sixth switching tube is connected to the filtering module.

[0022] In one possible implementation, the touch control chip further includes: a dead zone control module; an input end of the dead zone control module is connected to an output end of the signal generating module, and an output end of the dead zone control module is connected to the signal amplifying module; the dead zone control module is configured to perform dead zone control on the reference square wave signal generated by the signal generating module so that the connected switch tubes in the signal amplifying module are not turned on at the same time.

[0023] In one possible implementation, the signal generation module includes a sine wave generator, a sawtooth wave generator, a comparator, and a first level converter; the output of the sine wave generator is connected to the negative input of the comparator, the output of the sawtooth wave generator is connected to the positive input of the comparator, the output of the comparator is connected to the input of the first level converter, and the first level converter is connected to the signal amplification module; the sine wave generator is used to generate the sine wave signal; the sawtooth wave generator is used to generate the sawtooth carrier signal; the comparator is used to generate a level signal based on the sine wave signal and the sawtooth wave signal, and transmit the level signal to the first level converter; the first level converter is used to generate the reference square wave signal based on the level signal.

[0024] In one possible implementation, the signal generation module further includes a loop control unit and a loop filter; a first input of the loop control unit is connected to the output of the sine wave generator, a second input of the loop control unit is connected to the output of the filtering module, an output of the loop control unit is connected to the input of the loop filter, and an output of the loop filter is connected to the negative input of the comparator; the loop control unit is configured to adjust the waveform of the sine wave signal output by the sine wave generator according to the touch drive signal output by the filtering module, and input the adjusted sine wave signal to the loop filter; and the loop filter is configured to filter the adjusted sine wave signal.

[0025] In one possible implementation, the signal generation module includes a sine wave frequency and amplitude control unit, a carrier frequency and amplitude control unit, a carrier spreading unit, a digital comparison unit, and a second level converter. The carrier spreading unit is connected to the carrier frequency and amplitude control unit. The sine wave frequency and amplitude control unit and the carrier spreading unit are respectively connected to two input terminals of the digital comparison unit, and the output terminal of the digital comparison unit is connected to the input terminal of the second level converter. The sine wave frequency and amplitude control unit is configured to generate the sine wave signal based on sine wave data stored in a memory lookup table. The carrier frequency and amplitude control unit is configured to generate a sawtooth carrier sub-signal based on the carrier data stored in the memory lookup table. The carrier spreading unit is configured to perform spread spectrum processing on the sawtooth carrier sub-signal to obtain the sawtooth carrier signal. The digital comparison unit is configured to compare the sine wave signal with the sawtooth carrier signal and output the comparison result to the second level converter. The second level converter is configured to generate the reference square wave signal based on the comparison result.

[0026] In one possible implementation, the touch driver chip further includes: a loop feedback module; one end of the loop feedback module is connected to the output end of the filtering module, and the other end of the loop feedback module is connected to the power supply of the signal amplification module; the loop feedback module is used to perform closed-loop adjustment on the power supply of the signal amplification module based on the touch driver signal output by the filtering module.

[0027] In a possible implementation, the first switch tube is a PMOS tube, and the second switch tube is an NMOS tube.

[0028] In a possible implementation, the third switch tube and the fifth switch tube are PMOS tubes, and the fourth switch tube and the sixth switch tube are NMOS tubes.

[0029] According to a second aspect of the embodiments of the present application, a touch drive device is provided, comprising: a filtering module and a touch chip as described in any one of the first aspects of the embodiments of the present application; the filtering module is connected to the output end of the touch chip; the filtering module is used to filter the driving square wave signal transmitted by the touch chip to obtain at least one touch drive signal with a sine wave waveform.

[0030] According to a third aspect of an embodiment of the present application, a vehicle-mounted touch screen is provided, comprising: a plurality of drive electrodes and a touch drive device as described in the second aspect of the embodiment of the present application; the plurality of drive electrodes are connected to the fifth pin of the touch chip, and different drive electrodes are connected to different fifth pins; the drive electrodes are used to receive touch drive signals output by the touch drive device, so that the vehicle-mounted touch screen recognizes touch commands, wherein the drive electrodes are horizontal electrodes and / or vertical electrodes arranged on the touch screen or touchpad.

[0031] According to the touch chip provided in the embodiment of the present application, the touch chip is connected to the filtering module, the touch chip generates a driving square wave signal, and the filtering module filters the driving square wave signal to obtain a touch driving signal with a sine wave waveform. In this way, the driving electrodes of the vehicle-mounted touch screen can be driven by the touch driving signal with a sine wave waveform. Since the driving electrodes are driven by the touch driving signal with a sine wave waveform, the electromagnetic radiation interference generated is less than that generated by driving with a square wave signal in the prior art, so that the electromagnetic radiation interference of the vehicle-mounted touch screen can meet the automotive standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0033] FIG1 is a schematic diagram of a touch control chip provided in an embodiment of the present application;

[0034] FIG2 is a schematic diagram of a driving square wave signal provided in an embodiment of the present application;

[0035] FIG3 is a schematic diagram of a touch driving signal provided in an embodiment of the present application;

[0036] FIG4 is a schematic diagram of a prior art signal interference provided by an embodiment of the present application;

[0037] FIG5 is a schematic diagram of signal interference of a touch chip provided in an embodiment of the present application;

[0038] FIG6 is a circuit diagram of a filter module provided in an embodiment of the present application;

[0039] FIG7 is a circuit diagram of another filter module provided in an embodiment of the present application;

[0040] FIG8 is a schematic diagram of a switch group provided in an embodiment of the present application;

[0041] FIG9 is a schematic diagram of a touch chip including a variable resistor provided in an embodiment of the present application;

[0042] FIG10 is a schematic structural diagram of a touch chip provided in an embodiment of the present application;

[0043] FIG11 is a schematic structural diagram of another touch control chip provided in an embodiment of the present application;

[0044] FIG12 is a schematic structural diagram of another touch control chip provided in an embodiment of the present application;

[0045] FIG13 is a circuit diagram of a signal amplification module provided in an embodiment of the present application;

[0046] FIG14 is a schematic diagram of another signal amplification module provided in an embodiment of the present application;

[0047] FIG15 is a circuit diagram of another signal amplification module provided in an embodiment of the present application;

[0048] FIG16 is a schematic diagram of a timing sequence for generating a driving square wave signal provided by an embodiment of the present application;

[0049] FIG17 is a schematic diagram of a touch control chip including a dead zone control module provided in an embodiment of the present application;

[0050] FIG18 is a circuit diagram of a signal generating module provided in an embodiment of the present application;

[0051] FIG19 is a schematic diagram of a signal generation module including loop control provided in an embodiment of the present application;

[0052] FIG20 is a schematic diagram of another signal generation module provided in an embodiment of the present application;

[0053] FIG21 is a schematic diagram of a loop feedback module provided in an embodiment of the present application;

[0054] FIG22 is a schematic diagram of a touch control driving device provided in an embodiment of the present application;

[0055] Figure 23 is a schematic diagram of a vehicle-mounted touch screen provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and in detail described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0057] As a means of transportation, cars have brought great convenience to people's lives and work. With the increase in electric vehicle production, in-vehicle touch screens have gradually become mainstream in the market. Drivers and passengers can use the in-vehicle touch screen to play music, adjust ambient lighting, and set map navigation functions to meet diverse needs. Currently, the drive signal sent to the drive electrode by the touch chip included in the in-vehicle touch screen is a square wave signal, so that the in-vehicle touch screen receives the user's touch command. However, due to the rich harmonic components and high energy of the square wave, the electromagnetic radiation interference generated when the drive electrode of the in-vehicle touch screen is driven is high, which cannot meet automotive standards.

[0058] The present application provides a touch chip, which is connected to a filtering module. The touch chip generates a driving square wave signal, and the filtering module filters the driving square wave signal to obtain a touch driving signal with a sine wave waveform. In this way, the driving electrodes of a vehicle-mounted touch screen can be driven by the touch driving signal with a sine wave waveform. Since the driving electrodes are driven by the touch driving signal with a sine wave waveform, the electromagnetic radiation interference generated is less than that generated by driving with a square wave signal in the prior art, so that the electromagnetic radiation interference of the vehicle-mounted touch screen can meet the automotive standards.

[0059] The specific implementation of the embodiment of the present application is further explained below with reference to the accompanying drawings.

[0060] Figure 1 is a schematic diagram of a touch chip provided in an embodiment of the present application. As shown in Figure 1, the output end of the touch chip 10 is connected to the filtering module 20, and the output end of the touch chip 10 outputs a driving square wave signal, wherein the output end of the touch chip 10 includes the pin of the touch chip 10, and the filtering module 20 receives the driving square wave signal, filters the driving square wave signal, and outputs a touch driving signal with a sine wave waveform.

[0061] The touch chip 10 and the filter module 20 are electronic components arranged on the same circuit board. The output pin of the touch chip 10 is connected to the input end of the filter module 20. The touch chip 10 can generate a driving square wave signal. Optionally, Figure 2 is a schematic diagram of a driving square wave signal provided in an embodiment of the present application. As shown in Figure 2, the touch chip 10 can generate a driving square wave signal with a relatively slow edge.

[0062] The filtering module 20 can receive the driving square wave signal generated by the touch chip 10, and filter the driving square wave signal to remove the carrier in the driving square wave signal to obtain a touch driving signal with a sine wave waveform. Figure 3 is a schematic diagram of a touch driving signal provided in an embodiment of the present application. As shown in Figure 3, after the filtering module 20 filters the driving square wave signal, it outputs a driving signal with a sine wave waveform as shown in Figure 3.

[0063] Figure 4 is a schematic diagram of signal interference in a prior art provided by an embodiment of the present application. As shown in Figure 4 , when the driving electrode is driven by a square wave signal in the prior art, harmonic signal interference is included at each fundamental frequency. Figure 5 is a schematic diagram of signal interference in a touch chip provided by an embodiment of the present application. As shown in Figure 5 , when the driving electrode is driven by a touch driving signal with a sine wave waveform generated by an embodiment of the present application, harmonic signal interference exists only at 0.1 MHz. Therefore, the signal interference cannot affect the vehicle-mounted touch screen device, meeting the requirements of vehicle regulations.

[0064] In an embodiment of the present application, the touch chip 10 is connected to the filtering module 20. The touch chip 10 generates a driving square wave signal. The filtering module 20 filters the driving square wave signal to obtain a touch driving signal with a sinusoidal waveform. In this way, the driving electrode of the vehicle-mounted touch screen can be driven by the touch driving signal with a sinusoidal waveform. Since the driving electrode is driven by the touch driving signal with a sinusoidal waveform, the electromagnetic radiation interference generated by the driving by the square wave signal is less than that in the prior art, so that the electromagnetic radiation interference of the vehicle-mounted touch screen can meet the vehicle regulations.

[0065] Figure 6 is a circuit diagram of a filter module provided in an embodiment of the present application. As shown in Figure 6, the touch control chip 10 includes a first pin 101 and a second pin 102. The filter module 20 includes a first filter module 201. The first filter module 201 includes a first inductor L1 and a first capacitor C1. The first end of the first inductor L1 is connected to the first pin 101, the second end of the first inductor L1 is connected to both the first end of the first capacitor C1 and the second pin 102, and the second end of the first capacitor C1 is grounded.

[0066] The first inductor L1 and the first capacitor C1 form an LC filter. Optionally, the value range of L1 is 1uH to 100uH, the value range of C1 is 1nF to 100nF, and the cutoff frequency of the LC filter is 500K to 4M, so that the carrier in the driving square wave signal can be filtered out by the LC filter, thereby becoming a touch driving signal with a sine wave waveform.

[0067] It should be understood that the first inductor L1 and the first capacitor C1 of the embodiment of the present application can use LC resonance to recover the energy of the capacitive load in the touch control chip 10, thereby transmitting the stored capacitive load energy back to the touch control chip 10, driving the touch control chip 10 to generate a driving square wave signal, thereby further reducing power consumption.

[0068] In the embodiment of the present application, the first filtering module 201 includes a first inductor L1 and a first capacitor C1. The first inductor L1 and the first capacitor C1 form an LC filter to implement a filtering function, thereby filtering and shaping the driving square wave signal, so that the driving square wave signal can be shaped into a touch driving signal with a sine wave waveform. The LC filter can also recover the energy of the capacitive load in the touch chip 10, thereby reducing the power consumption of the touch chip 10 in generating the driving square wave signal.

[0069] In one possible implementation, the first end of the first inductor L1 serves as the input end of the first filtering module 201 to receive a driving square wave signal, and the second end of the first inductor L1 serves as the output end of the first filtering module 201 to output a touch driving signal with a sine wave waveform.

[0070] The first pin 101 of the touch chip 10 is an output pin that can output a driving square wave signal. The second pin 102 of the touch chip 10 is an input pin. The first inductor L1 is connected to the first pin 101 and serves as the input end of the filtering module 20 to receive the driving square wave signal output by the touch chip 10. After filtering the driving square wave signal through the first inductor L1 and the first capacitor C1, a touch driving signal with a sine wave waveform is generated. The touch driving signal is then transmitted back to the touch chip 10 through the second pin 102 via the second end of the first inductor L1, thereby driving the driving electrode through the touch chip 10.

[0071] In the embodiment of the present application, the first end of the first inductor L1 serves as the input end of the filter module 20 to receive the driving square wave signal; and the second end of the first inductor L1 serves as the output end of the filter module 20 to output a touch driving signal with a sine wave waveform. In this way, the driving square wave signal output by the touch chip 10 can be filtered, and the touch driving signal generated after the filtering process is transmitted back to the touch chip 10. In this way, the driving electrode can be driven by the touch chip 10, and the driving electrode is driven by the touch driving signal with a sine wave waveform, thereby generating less electromagnetic radiation interference.

[0072] Figure 7 is a circuit diagram of another filtering module provided in an embodiment of the present application. As shown in Figure 7, the pins of the touch chip 10 include a third pin 103 and a fourth pin 104. The filtering module 20 also includes a second filtering module 202. The second filtering module 202 includes a second inductor L2 and a second capacitor C2. The first end of the second inductor L2 is connected to the third pin 103, the second end of the second inductor L2 is simultaneously connected to the first end of the second capacitor C2 and the fourth pin 104, and the second end of the second capacitor C2 is grounded.

[0073] The second inductor L2 and the second capacitor C2 form an LC filter. Optionally, the value range of L2 is 1uH to 100uH, the value range of C2 is 1nF to 100nF, and the cutoff frequency of the LC filter is 500K to 4MHz. Therefore, the carrier in the driving square wave signal can be filtered out by the LC filter. For example, the carrier with a frequency of 4MHz is filtered out, thereby forming a touch driving signal with a sine wave waveform.

[0074] It should be understood that the second inductor L2 and the second capacitor C2 of the embodiment of the present application can use LC resonance to recover the energy of the capacitive load in the touch control chip 10, thereby transmitting the stored capacitive load energy back to the touch control chip 10, driving the touch control chip 10 to generate a driving square wave signal, thereby further reducing power consumption.

[0075] In the embodiment of the present application, the second filtering module 202 includes a second inductor L2 and a second capacitor C2. The second inductor L2 and the second capacitor C2 form an LC filter to implement a filtering function, thereby filtering and shaping the driving square wave signal, so that the driving square wave signal can be shaped into a touch driving signal with a sine wave waveform. In addition, the LC filter can recover the energy of the capacitive load in the touch chip 10, thereby reducing the power consumption of the touch chip 10 in generating the driving square wave signal.

[0076] In a possible implementation, the touch control chip 10 outputs driving square wave signals with opposite phases to the first filtering module 201 and the second filtering module 202 , and the first filtering module 201 and the second filtering module 202 output touch control driving signals with opposite phases.

[0077] In an embodiment of the present application, the filtering module 20 includes a first filtering module 201 and a second filtering module 202. The touch chip 10 outputs driving square wave signals with opposite phases to the first filtering module 201 and the second filtering module 202. Thus, the driving square wave signals with opposite phases can be filtered by the first filtering module 201 and the second filtering module 202 to obtain touch driving signals with opposite phases, thereby meeting the positive and negative coding requirements of the driving electrodes and being applicable to driving electrodes with various coding methods, with high applicability.

[0078] In one possible implementation, the pins of the touch chip 10 include a fifth pin; the fifth pin outputs a touch drive signal with a sine wave waveform to the drive electrode, wherein the drive electrode is a horizontal electrode and / or a vertical electrode arranged on the touch screen or touch pad.

[0079] In the embodiment of the present application, the touch chip 10 is connected to the driving electrode, i.e., the TX electrode, through the fifth pin, thereby outputting a touch driving signal with a sine wave waveform to the driving electrode, thereby driving the driving electrode through the touch driving signal. Since the touch driving signal is output through the touch chip 10, the output touch driving signal can be controlled, and it can be applied to drive electrodes with various encoding methods, and has high applicability.

[0080] In a possible implementation, the touch control chip 10 includes multiple switch groups and multiple fifth pins, and different switch groups are connected to different fifth pins.

[0081] In an embodiment of the present application, the touch chip 10 includes multiple switch groups and multiple fifth pins. Different switch groups are connected to different fifth pins, and multiple fifth pins are connected to multiple drive electrodes. Therefore, the touch drive signal output to the drive electrode can be controlled by the switch group, which can be suitable for driving drive electrodes with various encoding methods and has high applicability.

[0082] Figure 8 is a schematic diagram of a switch group provided in an embodiment of the present application. As shown in Figure 8, the switch group includes a first switch K1, a second switch K2, and a third switch K3. The first end of the first switch K1 in the switch group is connected to the second pin 102, the first end of the second switch K2 in the switch group is connected to the fourth pin 104, the first end of the third switch K3 in the switch group is grounded, and the second ends of the first switch K1, the second switch K2, and the third switch K3 in the same switch group are connected to the same fifth pin 105.

[0083] It should be understood that, assuming that the first filtering module 201 outputs a positive touch driving signal and the second filtering module 202 outputs a negative touch driving signal, when the first switch K1 is closed, the touch chip 10 outputs the positive touch driving signal received from the second pin 102 to the driving electrode; when the second switch K2 is closed, the touch chip 10 outputs the negative touch driving signal received from the fourth pin 104 to the driving electrode; when the third switch K3 is closed, the driving electrode is grounded, and the first switch K1, the second switch K2, and the third switch K3 cannot be closed at the same time.

[0084] In an embodiment of the present application, the switch group includes a first switch K1, a second switch K2, and a third switch K3, thereby enabling the touch drive signal input to the drive electrode to be controlled by the first switch K1, the second switch K2, and the third switch K3. Thus, the drive electrode can be driven by touch drive signals with opposite phases, or by a single phase signal in the touch drive signals with opposite phases, which has high applicability.

[0085] FIG9 is a schematic diagram of a touch control chip including variable resistors according to an embodiment of the present application. As shown in FIG9 , the touch control chip 10 includes a first variable resistor RH1 and a second variable resistor RH2. One end of the first variable resistor RH1 is connected to the first pin 101, and one end of the second variable resistor RH2 is connected to the third pin 103. The first variable resistor RH1 can adjust the Q value of the first filter module 201, and the second variable resistor RH2 can adjust the Q value of the second filter module 202.

[0086] The first filter module 201 and the first variable resistor RH1 are connected to both ends of the first pin 101 respectively, and the second filter module 202 and the second variable resistor RH2 are connected to both ends of the third pin 103 respectively. Therefore, the Q value of the first filter module 201 can be changed by changing the resistance value of the first variable resistor RH1, thereby changing the filtering characteristics of the first filter module 201 and the second filter module 202. Therefore, the Q value of the second filter module 202 can be changed by changing the resistance of the second variable resistor RH2 , thereby changing the filtering characteristics of the second filter module 202 .

[0087] It should be understood that the resistance values ​​of the first variable resistor RH1 and the second variable resistor RH2 can be adjusted by the touch control chip 10 as required, and the specific adjustment method is not limited in the embodiment of the present application.

[0088] In the embodiment of the present application, the touch chip 10 includes: a first variable resistor RH1 and a second variable resistor RH2. The first variable resistor RH1 can adjust the Q value of the first filter module 201, and the second variable resistor RH2 can adjust the Q value of the second filter module 202. In this way, the first filter module 201 and the second filter module 202 can filter out the carrier in the driving square wave signal as required to obtain a touch driving signal with a sine wave waveform.

[0089] Figure 10 is a schematic structural diagram of a touch chip provided in an embodiment of the present application. As shown in Figure 10, the touch chip 10 includes: a signal generation module 11 and a signal amplification module 12. The signal generation module 11 can generate a reference square wave signal based on a sine wave signal and a sawtooth carrier signal, and transmit the reference square wave signal to the signal amplification module 12. The signal amplification module 12 can amplify the reference square wave signal to obtain a driving square wave signal.

[0090] The touch chip 10 includes a signal generating module 11 and a signal amplifying module 12. The signal generating module 11 is connected to the signal amplifying module 12. After the signal generating module 11 generates a sine wave signal and a sawtooth carrier signal, it generates a reference square wave signal based on the sine wave signal and the sawtooth carrier signal. The signal amplifying module 12 amplifies the reference square wave signal to obtain the driving square wave signal shown in Figure 2.

[0091] In an embodiment of the present application, the touch chip 10 includes a signal generating module 11 and a signal amplifying module 12. The signal generating module 11 can generate a reference square wave signal based on a sine wave signal and a sawtooth carrier signal. The signal amplifying module 12 can amplify the reference square wave signal to obtain a driving square wave signal, thereby realizing the generation of a driving square wave signal.

[0092] FIG11 is a schematic diagram of the structure of another touch control chip provided in an embodiment of the present application. As shown in FIG11 , the touch control chip 10 further includes an inverter 13. There are two signal amplification modules 12, including a first signal amplification module 121 and a second signal amplification module 122. The output of the signal generation module 11 is connected to both the input of the inverter 13 and the input of the first signal amplification module 121. The output of the inverter 13 is connected to the input of the second signal amplification module 122. The output of the first signal amplification module 121 is connected to the first pin 101, and the output of the second signal amplification module 122 is connected to the third pin 103.

[0093] The inverter 13 can invert the first reference square wave signal generated by the signal generation module 11 to obtain a second reference square wave signal with a phase opposite to that of the first reference square wave signal, and transmit the second reference square wave signal to the second signal amplification module 122. The first signal amplification module 121 can amplify the first reference square wave signal to obtain a first driving square wave signal. The second signal amplification module 122 can amplify the second reference square wave signal to obtain a second driving square wave signal with a phase opposite to that of the first driving square wave signal. The first filtering module 201 can filter the first driving square wave signal to obtain a first touch driving signal with a sine wave waveform. The second filtering module 202 can filter the second driving square wave signal to obtain a second touch driving signal with a phase opposite to that of the first touch driving signal.

[0094] The number of signal generating modules 11 is 1. After the signal generating module 11 generates a reference square wave signal based on the sine wave signal and the sawtooth carrier signal, the reference square wave signal is output in two paths to the first signal amplifying module 121 and the inverter 13 respectively. After passing through the inverter 13, the reference square wave signal is inverted into a second reference square wave signal with opposite phase to the first reference square wave signal input to the first signal amplifying module 121, and is input to the second signal amplifying module 122. The first signal amplifying module 121 amplifies the first reference square wave signal to obtain a first driving square wave signal, and the second signal amplifying module 122 amplifies the second reference square wave signal to obtain a second driving square wave signal, thereby obtaining a first driving square wave signal and a second driving square wave signal with opposite phases.

[0095] The first signal amplifying module 121 transmits the first driving square wave signal to the first filtering module 201 via the first pin 101. The first filtering module 201 filters the first driving square wave signal transmitted from the first pin 101 to obtain a first touch driving signal with a sine wave waveform. The second signal amplifying module 122 transmits the second driving square wave signal to the second filtering module 202 via the third pin 103. The second filtering module 202 filters the second driving square wave signal transmitted from the third pin 103 to obtain a second touch driving signal with a sine wave waveform. Since the first driving square wave signal and the second driving square wave signal are in opposite phases, the second touch driving signal and the first touch driving signal are in opposite phases.

[0096] In the embodiment of the present application, the touch chip 10 includes an inverter 13, and the first reference square wave signal generated by the signal generating module 11 is input into the first signal amplifying module 121. The first reference square wave signal generated by the signal generating module 11 is inverted by the inverter 13 to obtain a second reference square wave signal, and is input into the second signal amplifying module 122. Thus, driving square wave signals with opposite phases can be obtained through the first signal amplifying module 121 and the second signal amplifying module 122. In the embodiment of the present application, the number of signal generating modules 11 is 1, and two reference square wave signals with opposite phases can be obtained, which reduces the number of components in the touch chip 10 and reduces the power consumption of the touch chip 10.

[0097] Figure 12 is a structural schematic diagram of another touch chip provided in an embodiment of the present application. As shown in Figure 12, the number of signal generating modules 11 of the touch chip 10 is two, and the two signal generating modules 11 include a first signal generating module 1101 and a second signal generating module 1102. The number of signal amplifying modules 12 is two, and the two signal amplifying modules 12 include a third signal amplifying module 123 and a fourth signal amplifying module 124. The first signal generating module 1101 is connected to the third signal amplifying module 123, the second signal generating module 1102 is connected to the fourth signal amplifying module 124, the third signal amplifying module 123 is connected to the first pin 101, and the fourth signal amplifying module 124 is connected to the third pin 103.

[0098] The first signal generating module 1101 can generate a third reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the third reference square wave signal to the third signal amplifying module 123. The second signal generating module 1102 can generate a fourth reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the fourth reference square wave signal to the fourth signal amplifying module 124. The third signal amplifying module 123 can amplify the third reference square wave signal to obtain a third driving square wave signal. The fourth signal amplifying module 124 can amplify the fourth reference square wave signal to obtain a fourth driving square wave signal having a phase opposite to that of the third driving square wave signal. The first filtering module 201 can filter the third driving square wave signal to obtain a third touch driving signal having a sine wave waveform. The second filtering module 202 can filter the fourth driving square wave signal to obtain a fourth touch driving signal having a phase opposite to that of the third touch driving signal.

[0099] There are two signal generating modules 11. The first signal generating module 1101 generates a third reference square wave signal based on a sine wave signal and a sawtooth carrier signal. The second signal generating module 1102 generates a fourth reference square wave signal based on the sine wave signal and the sawtooth carrier signal. The third reference square wave signal and the fourth reference square wave signal have opposite phases. Optionally, the first signal generating module 1101 and the second signal generating module 1102 can generate a third reference square wave signal and a fourth reference square wave signal with opposite phases based on sine wave signals with opposite phases and the same sawtooth carrier signal.

[0100] The third signal amplifying module 123 amplifies the third reference square wave signal to obtain a third driving square wave signal, and the fourth signal amplifying module 124 amplifies the fourth reference square wave signal to obtain a fourth driving square wave signal, thereby obtaining a third driving square wave signal and a fourth driving square wave signal with opposite phases.

[0101] The third signal amplification module 123 transmits the third driving square wave signal to the first filtering module 201 via the first pin 101. The first filtering module 201 filters the third driving square wave signal transmitted from the first pin 101 to obtain a third touch driving signal with a sine wave waveform. The fourth signal amplification module 124 transmits the fourth driving square wave signal to the second filtering module 202 via the third pin 103. The second filtering module 202 filters the fourth driving square wave signal transmitted from the third pin 103 to obtain a fourth touch driving signal with a sine wave waveform. Since the third driving square wave signal and the fourth driving square wave signal have opposite phases, the fourth touch driving signal and the third touch driving signal have opposite phases.

[0102] In the embodiment of the present application, the number of signal generating modules 11 is two, and the number of signal amplifying modules 12 is two, thereby enabling the first signal generating module 1101 and the second signal generating module 1102 to generate a third reference square wave signal and a fourth reference square wave signal with opposite phases, thereby enabling the first signal amplifying module 121 and the second signal amplifying module 122 to obtain a third driving square wave signal and a fourth driving square wave signal with opposite phases, which can be applied to driving driving electrodes with positive and negative coding, and has high applicability.

[0103] FIG13 is a circuit diagram of a signal amplification module provided in an embodiment of the present application. As shown in FIG13 , the signal amplification module 12 includes a first resistor R1, a second resistor R2, a third capacitor C3, a fourth capacitor C4, a first switch tube M1, and a second switch tube M2.

[0104] One end of the first resistor R1 is connected to the output end of the signal generating module 11, and the other end of the first resistor R1 is also connected to one end of the third capacitor C3 and the control end of the first switch tube M1. The other end of the third capacitor C3 is grounded. The input end of the first switch tube M1 is connected to the first power supply PV1, and the output end of the first switch tube M1 is connected to the filtering module 20. One end of the second resistor R2 is connected to the output end of the signal generating module 11, and the other end of the second resistor R2 is also connected to one end of the fourth capacitor C4 and the control end of the second switch tube M2. The other end of the fourth capacitor C4 is grounded. The input end of the second switch tube M2 is grounded, and the output end of the second switch tube M2 is connected to the filtering module 20.

[0105] The first resistor R1 and the third capacitor C3 as well as the second resistor R2 and the fourth capacitor C4 can slow down the edge of the reference square wave signal output by the signal generating module 11, thereby reducing the peak current input to the control terminals of the first switch tube M1 and the second switch tube M2, and reducing the electromagnetic interference generated when driving the first switch tube M1 and the second switch tube M2.

[0106] Specifically, after the signal generation module 11 outputs the reference square wave signal, since the input end of the first switch tube M1 is connected to the first power supply PV1, the first switch tube M1 pulls up the level output by the signal amplification module 12 when it is turned on. Since the input end of the second switch tube M2 is grounded, the second switch tube M2 pulls down the level output by the signal amplification module 12 when it is turned on. After the signal generation module 11 outputs the reference square wave signal, since the reference square wave signal includes a high level and a low level, the first switch tube M1 and the second switch tube M2 are alternately turned on to output a driving square wave signal. It should be understood that since the first resistor R1 and the third capacitor C3 and the second resistor R2 and the fourth capacitor C4 can slow down the edge of the reference square wave signal output by the signal generation module 11, the driving square wave signal is a square wave signal similar to a trapezoidal wave, such as the driving square wave signal shown in Figure 2.

[0107] It should be noted that the first signal amplification module 121, the second signal amplification module 122, the third signal amplification module 123 and the fourth signal amplification module 124 can all adopt the above-mentioned circuit connection relationship, and the signal amplification module 12 can be connected to the filtering module 20 through the pins of the touch chip 10, for example: the first pin 101 and the third pin 103, which will not be repeated here.

[0108] It should be understood that the first switch tube M1 and the second switch tube M2 have only two states: on or off. In the on state, the on resistance can be minimized, and the off state consumes almost no power. Therefore, the power consumption is low and the overall efficiency is >80%. Compared with using Class A and / or Class B power amplifiers, the efficiency is higher.

[0109] In the embodiment of the present application, the signal amplification function is realized by the first switch tube M1 and the second switch tube M2. The edge of the reference square wave signal output by the signal generation module 11 can be slowed down by the first resistor R1 and the third capacitor C3 as well as the second resistor R2 and the fourth capacitor C4, thereby reducing the electromagnetic interference caused by driving the first switch tube M1 and the second switch tube M2 by the reference square wave signal. Thus, the square wave signal can be amplified by the signal amplification module 12, thereby reducing the electromagnetic interference. Moreover, since the signal amplification function is realized by the first switch tube M1 and the second switch tube M2, the signal amplification module 12 is a Class D signal amplifier, which has higher efficiency and lower power consumption than the Class A and / or Class B power amplifiers.

[0110] FIG14 is a schematic diagram of another signal amplification module provided in an embodiment of the present application. As shown in FIG14 , the signal amplification module 12 includes two signal amplification branches, a fourth switch K4 , a fifth switch K5 and a digital control unit 501 .

[0111] Both signal amplification branches are connected to the signal generating module 11. The two signal amplification branches include a first signal amplification branch 125 and a second signal amplification branch 126. The first signal amplification branch 125 is connected to the second power supply PV2 through the fourth switch K4, and the second signal amplification branch 126 is connected to the third power supply NV1 through the fifth switch K5. The fourth switch K4 and the fifth switch K5 are connected to the numerical control unit 501. The second power supply PV2 and the third power supply NV1 output voltages of opposite phases.

[0112] The signal amplification branch can amplify the reference square wave signal to obtain a driving square wave signal, wherein the first signal amplification branch 125 and the second signal amplification branch 126 output driving square wave signals with opposite phases, and the numerical control unit 501 can control one of the fourth switch K4 and the fifth switch K5 to be turned on, wherein when the fourth switch K4 is turned on, the second power supply PV2 supplies power to the first signal amplification branch 125, and when the fifth switch K5 is turned on, the third power supply NV1 supplies power to the second signal amplification branch 126.

[0113] When the fourth switch K4 is turned on, the second power supply PV2 supplies power to the first signal amplifying branch 125. When the fifth switch K5 is turned on, the third power supply NV1 supplies power to the second signal amplifying branch 126. Since the second power supply PV2 and the third power supply NV1 output voltages with opposite phases, the first signal amplifying branch 125 and the second signal amplifying branch 126 output driving square wave signals with opposite phases. For example, the second power supply PV2 outputs a +15V voltage. At this time, the first signal amplifying branch 125 can output a driving square wave signal in the range of 0V-15V. The third power supply NV1 outputs a -15V voltage. At this time, the second signal amplifying branch 126 can output a driving square wave signal in the range of -15V-0V.

[0114] It should be understood that since the driving square wave signals output from the first signal amplification branch 125 and the second signal amplification branch 126 have opposite phases, when the fourth switch K4 connected to the first signal amplification branch 125 is closed, the fifth switch K5 connected to the second signal amplification branch 126 is disconnected, that is, the fourth switch K4 and the fifth switch K5 cannot be closed at the same time, preventing signals with opposite phases from canceling each other out.

[0115] In an embodiment of the present application, the signal amplification module 12 includes two signal amplification branches, and the two signal amplification modules 12 are connected to power supplies with opposite output phases through different switches, so that driving square wave signals with opposite phases can be output through the two signal amplification branches. This can reduce the peak voltage required for driving square wave signals with the same amplitude, that is, converting the 0V to 2nV driving square wave signal into -nV to nV, thereby reducing the voltage required for the power supply to power the signal amplification module 12.

[0116] FIG15 is a circuit diagram of another signal amplification module provided in an embodiment of the present application. As shown in FIG15 , the first signal amplification branch 125 includes a third resistor R3, a fourth resistor R4, a fifth capacitor C5, a sixth capacitor C6, a third switch tube M3, and a fourth switch tube M4.

[0117] One end of the third resistor R3 is connected to the output end of the signal generation module 11, and the other end of the third resistor R3 is connected to one end of the fifth capacitor C5 and the control end of the third switch M3. The other end of the fifth capacitor C5 is grounded. The input end of the third switch M3 is connected to the fourth switch K4, and the output end of the third switch M3 is connected to the filter module 20. One end of the fourth resistor R4 is connected to the output end of the signal generation module 11, and the other end of the fourth resistor R4 is connected to one end of the sixth capacitor C6 and the control end of the fourth switch M4. The other end of the sixth capacitor C6 is grounded. The input end of the fourth switch M4 is grounded, and the output end of the fourth switch M4 is connected to the filter module 20.

[0118] The second signal amplification branch 126 includes a fifth resistor R5, a sixth resistor R6, a seventh capacitor C7, an eighth capacitor C8, a fifth switch M5, and a sixth switch M6. One end of the fifth resistor R5 is connected to the output end of the signal generation module 11, the other end of the fifth resistor R5 is connected to one end of the seventh capacitor C7 and the control end of the fifth switch M5, the other end of the seventh capacitor C7 is grounded, the input end of the fifth switch M5 is connected to the fifth switch K5, and the output end of the fifth switch M5 is connected to the filtering module 20. One end of the sixth resistor R6 is connected to the output end of the signal generation module 11, the other end of the sixth resistor R6 is connected to one end of the eighth capacitor C8 and the control end of the sixth switch M6, the other end of the eighth capacitor C8 is grounded, the input end of the sixth switch M6 is grounded, and the output end of the sixth switch M6 is connected to the filtering module 20.

[0119] The resistor and capacitor connected to the control terminal of the switch tube can slow down the edge of the reference square wave signal output by the signal generation module 11, thereby reducing the peak current input to the control terminal of the switch tube, reducing the electromagnetic interference generated by driving the switch tube by the reference square wave signal, and making the switch tube combination output the driving square wave signal.

[0120] Specifically, with respect to the third switch tube M3 and the fourth switch tube M4 included in the first signal amplification branch 125, after the signal generation module 11 outputs the reference square wave signal, since the input end of the third switch tube M3 is connected to the second power supply PV2 via the fourth switch K4, the fourth switch K4 is closed and the third switch tube M3 is turned on, thereby raising the level of the output of the signal amplification module 12. Since the input end of the fourth switch tube M4 is grounded, the fourth switch tube M4 is turned on, thereby lowering the level of the output of the signal amplification module 12. After the signal generation module 11 outputs the reference square wave signal, since the reference square wave signal includes a high level and a low level, the third switch tube M3 and the fourth switch tube M4 are alternately turned on to output the amplified drive square wave signal, thereby achieving output of the drive square wave signal.

[0121] With respect to the fifth switch tube M5 and the sixth switch tube M6 included in the second signal amplification branch 126, after the signal generation module 11 outputs the reference square wave signal, since the input end of the fifth switch tube M5 is connected to the third power supply NV1 via the fifth switch K5, the fifth switch K5 is closed and the fifth switch tube M5 is turned on, which pulls down the level output by the signal amplification module 12. Since the input end of the sixth switch tube M6 is grounded, the sixth switch tube M6 is turned on, which pulls up the level output by the signal amplification module 12. After the signal generation module 11 outputs the reference square wave signal, since the reference square wave signal includes a high level and a low level, the fifth switch tube M5 and the sixth switch tube M6 are alternately turned on to output the amplified drive square wave signal, thereby achieving output of the drive square wave signal.

[0122] Figure 16 is a schematic diagram of a timing for generating a driving square wave signal provided in an embodiment of the present application. As shown in Figure 16, when the fifth switch K5 is closed and the fourth switch K4 is disconnected, the driving square wave signal is a negative phase square wave signal. When the fifth switch K5 is disconnected and the fourth switch K4 is closed, the driving square wave signal is a positive phase square wave signal.

[0123] It should be noted that the first signal amplification module 121, the second signal amplification module 122, the third signal amplification module 123 and the fourth signal amplification module 124 can all include the above-mentioned first signal amplification branch 125 and the second signal amplification branch 126, and can all be connected using the above-mentioned circuit. The first signal amplification branch 125 and the second signal amplification branch 126 included in the same signal amplification module 12 are connected to the same filtering module 20. In one example, it can be connected to the filtering module 20 through the pins of the touch chip 10, which will not be repeated here.

[0124] It should be understood that the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5 and the sixth switch tube M6 have only two states: on or off. In the on state, the on resistance can be minimized, and in the off state, almost no power is consumed. Therefore, the power consumption is low and the overall efficiency is greater than 80%. Compared with using Class A and / or Class B power amplifiers, the efficiency is higher.

[0125] It should also be noted that the first power supply PV1, the second power supply PV2 and the third power supply NV1 can be DC / DC, charge pump or LDO power supply, and the specific form of the power supply is not limited here.

[0126] In an embodiment of the present application, the signal amplification function is achieved by driving the switching tube, and the edge of the reference square wave signal output by the signal generation module 11 is slowed down by connecting the resistor and capacitor to the control end of the switching tube, thereby reducing the electromagnetic interference generated by driving the switching tube by the reference square wave signal. Therefore, the square wave signal can be amplified by the signal amplification module 12, thereby reducing the electromagnetic interference. Since the signal amplification function is achieved by using the switching tube, the signal amplification module 12 is a Class D signal amplifier, which is more efficient than using Class A and / or Class B power amplifiers, and therefore has lower power consumption.

[0127] FIG17 is a schematic diagram of a touch control chip including a dead zone control module according to an embodiment of the present application. As shown in FIG17 , the touch control chip 10 further includes a dead zone control module 14. The input of the dead zone control module 14 is connected to the output of the signal generation module 11, and the output of the dead zone control module 14 is connected to the signal amplification module 12.

[0128] The dead zone control module 14 can perform dead zone control on the reference square wave signal generated by the signal generation module 11 so that the switch tubes connected to the signal amplification module 12 will not be turned on at the same time.

[0129] In the embodiment of the present application, the touch chip 10 further includes a dead zone control module 14, which can prevent the connected switch tubes in the signal amplification module 12 from being turned on at the same time, thereby avoiding damage to the circuit in the signal amplification module 12 and ensuring that the touch chip 10 normally generates a driving square wave signal.

[0130] FIG18 is a circuit diagram of a signal generating module provided in an embodiment of the present application. As shown in FIG18 , the signal generating module 11 includes a sine wave generator 111 , a sawtooth wave generator 112 , a comparator 113 and a first level converter 114 .

[0131] The output of the sine wave generator 111 is connected to the negative input of the comparator 113, the output of the sawtooth wave generator 112 is connected to the positive input of the comparator 113, the output of the comparator 113 is connected to the input of the first level converter 114, and the first level converter 114 is connected to the signal amplification module 12;

[0132] The sine wave generator 111 can generate a sine wave signal, the sawtooth wave generator 112 can generate a sawtooth carrier signal, the comparator 113 can generate a level signal based on the sine wave signal and the sawtooth wave signal, and transmit the level signal to the first level converter 114, and the first level converter 114 can generate a reference square wave signal according to the level signal.

[0133] The sine wave generator 111 is a D / A generator that generates a sine wave signal, and the sawtooth wave generator 112 generates a sawtooth carrier signal. Optionally, the sawtooth wave generator 112 can generate a wideband, low-power frequency sawtooth carrier signal that is spread in the range of 2M to 5.7M, with a center frequency of 4MHz. This can randomly disperse the energy of the sawtooth carrier signal, so that the energy at the carrier is further reduced. Optionally, the modulation coefficient can be adjusted to 0.2 to 0.9, and the spectrum of the electromagnetic interference of the touch drive signal can be further configured and adjusted.

[0134] Comparator 113 compares the sine wave signal with the sawtooth carrier signal and outputs a level signal based on the comparison result. For example, it outputs a high level when the sawtooth carrier signal is greater than the sine wave signal, and outputs a low level when the sawtooth carrier signal is less than the sine wave signal. First level converter 114 can convert the level signal output by comparator 113 into a reference square wave signal. For example, it can amplify the level signal to output a reference square wave signal with a larger signal amplitude.

[0135] It should be noted that both the first signal generating module 1101 and the second signal generating module 1102 may adopt the circuit of the above-mentioned signal generating module 11, but the sine wave generators 111 in the first signal generating module 1101 and the second signal generating module 1102 generate sine wave signals with opposite phases.

[0136] In an embodiment of the present application, the signal generation module 11 includes a sine wave generator 111, a sawtooth wave generator 112, a comparator 113, and a first level converter 114. The sine wave generator 111 generates a sine wave signal, the sawtooth wave generator 112 generates a sawtooth wave carrier signal, and the comparator 113 compares the sine wave signal and the sawtooth wave carrier signal to generate a level signal, so that a reference square wave signal can be output through the first converter, thereby realizing the generation of a reference square wave signal.

[0137] FIG19 is a schematic diagram of a signal generating module including loop control provided in an embodiment of the present application. As shown in FIG19 , the signal generating module 11 further includes a loop control unit 115 and a loop filter 116 .

[0138] A first input terminal of the loop control unit 115 is connected to the output terminal of the sine wave generator 111, a second input terminal of the loop control unit 115 is connected to the output terminal of the filter module 20, an output terminal of the loop control unit 115 is connected to the input terminal of the loop filter 116, and an output terminal of the loop filter 116 is connected to the negative input terminal of the comparator 113.

[0139] The loop control unit 115 may adjust the waveform of the sine wave signal output by the sine wave generator 111 according to the touch driving signal output by the filtering module 20 , and input the adjusted sine wave signal to the loop filter 116 , which may filter the adjusted sine wave signal.

[0140] The loop control unit 115 can collect the waveform of the touch drive signal output by the filtering module 20 and perform closed-loop feedback adjustment on the sine wave signal output by the sine wave generator 111 based on the collected waveform of the touch drive signal. Because the adjusted sine wave signal may generate interference, the adjusted sine wave signal is filtered by the loop filter 116 and then input into the comparator 113.

[0141] It should be noted that both the first signal generating module 1101 and the second signal generating module 1102 may include the above-mentioned loop control unit 115 and the loop filter 116. The loop control unit 115 in the first signal generating module 1101 can be connected to the output end of the first filtering module 201 through the second pin 102, and the loop control unit 115 in the second signal generating module 1102 can be connected to the output end of the second filtering module 202 through the fourth pin 104.

[0142] In the embodiment of the present application, the signal generation module 11 further includes a loop control unit 115 and a loop filter 116. The loop control unit 115 can adjust the sine wave signal output by the sine wave generator 111 based on the touch drive signal output by the first filtering module 201, thereby forming a closed-loop feedback loop to ensure that the output sine wave signal meets the requirements. In addition, since the loop filter 116 is provided, signal interference generated during closed-loop feedback is avoided and signal interference is reduced.

[0143] FIG20 is a schematic diagram of another signal generation module provided in an embodiment of the present application. As shown in FIG20 , the signal generation module 11 includes a sine wave frequency and amplitude control unit 117, a carrier frequency and amplitude control unit 118, a carrier spreading unit 119, a digital comparison unit 1110, and a second level converter 1111. The carrier spreading unit 119 is connected to the carrier frequency and amplitude control unit 118. The sine wave frequency and amplitude control unit 117 and the carrier spreading unit 119 are respectively connected to the two input terminals of the digital comparison unit 1110. The output terminal of the digital comparison unit 1110 is connected to the input terminal of the second level converter 1111.

[0144] The sine wave frequency and amplitude control unit 117 can generate a sine wave signal based on the sine wave data stored in the memory lookup table. The carrier frequency and amplitude control unit 118 can generate a sawtooth carrier sub-signal based on the carrier data stored in the memory lookup table. The carrier spread spectrum unit 119 can perform spread spectrum processing on the sawtooth carrier sub-signal to obtain a sawtooth carrier signal. The digital comparison unit 1110 can compare the sine wave signal and the sawtooth carrier signal and output the comparison result to the second level converter 1111. The second level converter 1111 can generate a reference square wave signal based on the comparison result.

[0145] A memory lookup table, i.e., a ROM table, pre-stores waveform data lookup tables for sine waves and sawtooth waves. The sine wave frequency amplitude control unit 117 and the carrier frequency amplitude control unit 118 obtain a sine wave signal and a sawtooth carrier signal by performing amplitude and frequency changes by looking up the waveform data in the ROM table. The sine wave and sawtooth wave are then compared by the digital comparison unit 1110 to generate a digital sequence, for example, 0101101. The second level converter 1111 outputs a reference square wave signal based on the comparison result generated by the digital comparison unit 1110.

[0146] Optionally, the carrier spreading unit 119 can spread the generated sawtooth wave in the range of 2M to 5.7M to obtain a wide-band, low-power frequency sawtooth carrier signal with a center frequency of 4MHz, thereby randomly breaking up the energy of the sawtooth carrier signal, so that the energy at the carrier is further reduced.

[0147] In one example, the output end of the second level converter 1111 can be connected to a buffer, thereby amplifying the square wave signal output by the second level converter 1111 to ensure that the output square wave signal can drive the switch tube in the signal amplification module 12, which will not be repeated here.

[0148] It should be noted that the first signal generating module 1101 and the second signal generating module 1102 can both use the circuit of the above-mentioned signal generating module 11, but the sine wave frequency amplitude control units 117 in the first signal generating module 1101 and the second signal generating module 1102 generate sine wave signals with opposite phases.

[0149] In the embodiment of the present application, the signal generating module 11 includes a sine wave frequency amplitude control unit 117, a carrier frequency amplitude control unit 118, a carrier spread spectrum unit 119, a digital comparison unit 1110 and a second level converter 1111, which can generate a reference square wave signal. Since the signal is generated by a digital circuit, the power consumption of the signal generated by the analog circuit in the aforementioned embodiment is lower, thereby reducing the power consumption of the touch chip 10.

[0150] In one possible implementation, the touch chip 10 also includes a loop feedback module, one end of the loop feedback module is connected to the output end of the filtering module 20, and the other end of the loop feedback module is connected to the power supply of the signal amplification module 12. The loop feedback module can perform closed-loop adjustment on the power supply of the signal amplification module 12 according to the touch drive signal output by the filtering module 20.

[0151] In one example, FIG21 is a schematic diagram of a loop feedback module provided in an embodiment of the present application. As shown in FIG21 , the loop feedback module 15 includes a detection module 151 , an error amplifier 152 and a control module 153 .

[0152] One end of the detection module 151 is connected to the output end of the first filtering module 201, the other end of the detection module 151 is connected to an input end of the error amplifier 152, the other input end of the error amplifier 152 is connected to the reference voltage, the output end of the error amplifier 152 is connected to the control module 153, and the control module 153 is connected to the power supply of the signal amplification module 12.

[0153] The level data of the touch drive signal is collected by the peak or effective value detection module 151, and then sent to the error amplifier 152 for comparison with the reference voltage. The error is amplified and sent to the control module 153, and finally the control module 153 adaptively adjusts the output voltage of the power supply.

[0154] It should be understood that when the signal amplification module 12 includes two signal amplification branches, two loop feedback modules 15 are provided due to the presence of two power supplies. At this time, the touch chip 10 includes four loop feedback modules 15, which are respectively connected to the power supplies of the four signal amplification branches included in the two signal amplification modules 12.

[0155] In the embodiment of the present application, the touch chip 10 further includes a loop feedback module 15, which can perform closed-loop feedback on the signal amplification module 12. By collecting the touch drive signal, the power supply voltage of the signal amplification module 12 is changed, ensuring that the sine wave signal output by the first filtering module 201 meets the requirements.

[0156] In a possible implementation, as shown in FIG13 , the first switch tube M1 is a PMOS tube, and the second switch tube M2 is an NMOS tube.

[0157] In the embodiment of the present application, the first switch tube M1 is a PMOS tube, and the second switch tube M2 is an NMOS tube, so they can be alternately turned on under the drive of the reference square wave signal to achieve a signal amplification function.

[0158] In a possible implementation, as shown in FIG15 , the third switch transistor M3 and the fifth switch transistor M5 are PMOS transistors, and the fourth switch transistor M4 and the sixth switch transistor M6 are NMOS transistors.

[0159] In the embodiment of the present application, the third switch tube M3 and the fifth switch tube M5 are PMOS tubes, and the fourth switch tube M4 and the sixth switch tube M6 are NMOS tubes, so they can be alternately turned on under the drive of the reference square wave signal to achieve signal amplification function.

[0160] Figure 22 is a schematic diagram of a touch drive device provided in an embodiment of the present application. As shown in Figure 22, the touch drive device 30 includes: a filtering module 20 and a touch chip 10 of any one of the above embodiments. The filtering module 20 is connected to the output end of the touch chip 10. The filtering module 20 can filter the driving square wave signal transmitted by the touch chip 10 to obtain at least one touch drive signal with a sine wave waveform.

[0161] Figure 23 is a schematic diagram of a vehicle-mounted touch screen provided in an embodiment of the present application. As shown in Figure 23, the vehicle-mounted touch screen 40 includes multiple driving electrodes 41 and the touch driving device 30 mentioned above. The multiple driving electrodes 41 are connected to the fifth pin 105 of the touch chip 10. Different driving electrodes 41 are connected to different fifth pins 105. The driving electrodes 41 can receive touch driving signals output by the touch driving device 30, so that the vehicle-mounted touch screen 40 recognizes touch commands. The driving electrodes 41 are horizontal electrodes and / or vertical electrodes arranged on the touch screen or touchpad.

[0162] It should be understood that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts of the various embodiments will be sufficient. Each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments are generally similar to the methods described in the device and system embodiments, so their description is relatively simple. For relevant details, references to the descriptions of the other embodiments will suffice.

[0163] It should be understood that the foregoing description of this specification is based on specific embodiments. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0164] It should be understood that an element described herein in the singular or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown herein as separate may be combined into a single module or element, and modules or elements described or shown herein as single may be split into multiple modules or elements.

[0165] It should also be understood that the terms and expressions used herein are for descriptive purposes only, and the one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

Claims

1. A touch chip, characterized in that: The output end of the touch chip is connected to the filter module; The output end of the touch chip outputs a driving square wave signal, wherein the output end of the touch chip includes a pin of the touch chip; The filtering module receives the driving square wave signal, performs filtering on the driving square wave signal, and outputs a touch driving signal with a sine wave waveform.

2. The touch control chip according to claim 1, wherein: The pins of the touch chip include a first pin and a second pin, the filtering module includes a first filtering module, and the first filtering module includes a first inductor and a first capacitor; A first end of the first inductor is connected to the first pin, a second end of the first inductor is connected to the first end of the first capacitor and the second pin at the same time, and a second end of the first capacitor is grounded.

3. The touch control chip according to claim 2, wherein: The first end of the first inductor serves as the input end of the first filtering module for receiving the driving square wave signal; and the second end of the first inductor serves as the output end of the first filtering module for outputting the touch driving signal with the sine wave waveform.

4. The touch control chip according to claim 2, wherein: The pins of the touch chip include a third pin and a fourth pin, the filtering module further includes a second filtering module, and the second filtering module includes a second inductor and a second capacitor; A first end of the second inductor is connected to the third pin, a second end of the second inductor is connected to the first end of the second capacitor and the fourth pin at the same time, and a second end of the second capacitor is grounded.

5. The touch control chip according to claim 4, characterized in that: The touch control chip outputs the driving square wave signals with opposite phases to the first filtering module and the second filtering module, and the first filtering module and the second filtering module output the touch control driving signals with opposite phases.

6. The touch control chip according to claim 4, characterized in that: The pins of the touch chip include a fifth pin; the fifth pin outputs the touch drive signal with the sine wave waveform to the drive electrode; wherein the drive electrode is a horizontal electrode and / or a vertical electrode arranged on the touch screen or touch pad.

7. The touch control chip according to claim 6, characterized in that: The touch chip includes a plurality of switch groups and a plurality of fifth pins, and different switch groups are connected to different fifth pins.

8. The touch control chip according to claim 7, characterized in that: The switch group includes a first switch, a second switch and a third switch; A first end of the first switch in the switch group is connected to the second pin, a first end of the second switch in the switch group is connected to the fourth pin, a first end of the third switch in the switch group is grounded, and second ends of the first, second, and third switches in the same switch group are connected to the same fifth pin.

9. The touch control chip according to claim 5, characterized in that: The touch control chip includes: a first variable resistor and a second variable resistor; One end of the first variable resistor is connected to the first pin, and one end of the second variable resistor is connected to the third pin; The first variable resistor is used to adjust the Q value of the first filtering module; The second variable resistor is used to adjust the Q value of the second filtering module.

10. The touch control chip according to claim 5, characterized in that: The touch control chip includes: a signal generating module and a signal amplifying module; The signal generating module is configured to generate a reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the reference square wave signal to the signal amplifying module; The signal amplification module is used to amplify the reference square wave signal to obtain the driving square wave signal.

11. The touch control chip according to claim 10, characterized in that: The touch control chip further includes: an inverter; There are two signal amplification modules, and the two signal amplification modules include a first signal amplification module and a second signal amplification module; The output end of the signal generating module is connected to the input end of the inverter and the input end of the first signal amplifying module at the same time, the output end of the inverter is connected to the input end of the second signal amplifying module, the output end of the first signal amplifying module is connected to the first pin block, and the output end of the second signal amplifying module is connected to the third pin; The inverter is configured to invert the first reference square wave signal generated by the signal generating module to obtain a second reference square wave signal having a phase opposite to that of the first reference square wave signal, and transmit the second reference square wave signal to the second signal amplifying module; The first signal amplifying module is configured to amplify the first reference square wave signal to obtain a first driving square wave signal; The second signal amplifying module is configured to amplify the second reference square wave signal to obtain a second driving square wave signal with a phase opposite to that of the first driving square wave signal; The first filtering module is configured to filter the first driving square wave signal to obtain a first touch driving signal with a sine wave waveform; The second filtering module is configured to filter the second driving square wave signal to obtain a second touch driving signal having a phase opposite to that of the first touch driving signal.

12. The touch control chip according to claim 10, wherein: There are two signal generating modules, including a first signal generating module and a second signal generating module; there are two signal amplifying modules, including a third signal amplifying module and a fourth signal amplifying module; The first signal generating module is connected to the third signal amplifying module, the second signal generating module is connected to the fourth signal amplifying module, the third signal amplifying module is connected to the first pin, and the fourth signal amplifying module is connected to the third pin; The first signal generating module is configured to generate a third reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the third reference square wave signal to the third signal amplifying module; The second signal generating module is configured to generate a fourth reference square wave signal based on the sine wave signal and the sawtooth carrier signal, and transmit the fourth reference square wave signal to the fourth signal amplifying module; The third signal amplifying module is configured to amplify the third reference square wave signal to obtain a third driving square wave signal; The fourth signal amplifying module is configured to amplify the fourth reference square wave signal to obtain a fourth driving square wave signal having a phase opposite to that of the third driving square wave signal; The first filtering module is configured to filter the third driving square wave signal to obtain a third touch driving signal with a sine wave waveform; The second filtering module is configured to filter the fourth driving square wave signal to obtain a fourth touch driving signal having a phase opposite to that of the third touch driving signal.

13. The touch control chip according to any one of claims 10 to 12, characterized in that: The signal amplification module includes a first resistor, a second resistor, a third capacitor, a fourth capacitor, a first switch tube and a second switch tube; One end of the first resistor is connected to the output end of the signal generating module, the other end of the first resistor is connected to one end of the third capacitor and the control end of the first switching tube, the other end of the third capacitor is grounded, the input end of the first switching tube is connected to the first power supply, and the output end of the first switching tube is connected to the filtering module; One end of the second resistor is connected to the output end of the signal generating module, the other end of the second resistor is connected to one end of the fourth capacitor and the control end of the second switching tube, the other end of the fourth capacitor is grounded, the input end of the second switching tube is grounded, and the output end of the second switching tube is connected to the filtering module.

14. The touch control chip according to any one of claims 10 to 12, characterized in that: The signal amplification module includes two signal amplification branches, a fourth switch, a fifth switch and a digital control unit; The two signal amplifying branches are connected to the signal generating module; The two signal amplifying branches include a first signal amplifying branch and a second signal amplifying branch, and the signal generating module is connected to the first signal amplifying branch and the second signal amplifying branch at the same time; The first signal amplifying branch is connected to the second power supply via the fourth switch, the second signal amplifying branch is connected to the third power supply via the fifth switch, the fourth switch and the fifth switch are connected to a numerical control unit, and the second power supply and the third power supply output voltages of opposite phases; The signal amplifying branch is configured to amplify the reference square wave signal to obtain a driving square wave signal, wherein the first signal amplifying branch and the second signal amplifying branch output driving square wave signals with opposite phases; The digital control unit is used to control one of the fourth switch and the fifth switch to be turned on, wherein when the fourth switch is turned on, the second power supply supplies power to the first signal amplification branch, and when the fifth switch is turned on, the third power supply supplies power to the second signal amplification branch.

15. The touch control chip according to claim 14, characterized in that: The first signal amplifying branch includes a third resistor, a fourth resistor, a fifth capacitor, a sixth capacitor, a third switch tube and a fourth switch tube; One end of the third resistor is connected to the output end of the signal generating module, the other end of the third resistor is connected to one end of the fifth capacitor and the control end of the third switch tube, the other end of the fifth capacitor is grounded, and the input end of the third switch tube is connected to the first switch; One end of the fourth resistor is connected to the output end of the signal generating module, the other end of the fourth resistor is connected to one end of the sixth capacitor and the control end of the fourth switch tube, the other end of the sixth capacitor is grounded, and the input end of the fourth switch tube is grounded; The second signal amplifying branch includes a fifth resistor, a sixth resistor, a seventh capacitor, an eighth capacitor, a fifth switch tube and a sixth switch tube; One end of the fifth resistor is connected to the output end of the signal generating module, the other end of the fifth resistor is connected to one end of the seventh capacitor and the control end of the fifth switching tube, the other end of the seventh capacitor is grounded, the input end of the fifth switching tube is connected to the second switch, and the output end of the fifth switching tube is connected to the filtering module; One end of the sixth resistor is connected to the output end of the signal generating module, the other end of the sixth resistor is connected to one end of the eighth capacitor and the control end of the sixth switch tube, the other end of the eighth capacitor is grounded, the input end of the sixth switch tube is grounded, and the output end of the sixth switch tube is connected to the filtering module.

16. The touch control chip according to any one of claims 10 to 12, characterized in that: The touch control chip further includes: a dead zone control module; The input end of the dead zone control module is connected to the output end of the signal generation module, and the output end of the dead zone control module is connected to the signal amplification module; The dead zone control module is used to perform dead zone control on the reference square wave signal generated by the signal generation module, so that the switch tubes connected to the signal amplification module will not be turned on at the same time.

17. The touch control chip according to any one of claims 10 to 12, characterized in that: The signal generating module includes a sine wave generator, a sawtooth wave generator, a comparator and a first level converter; The output end of the sine wave generator is connected to the negative input end of the comparator, the output end of the sawtooth wave generator is connected to the positive input end of the comparator, the output end of the comparator is connected to the input end of the first level converter, and the first level converter is connected to the signal amplification module; The sine wave generator is used to generate the sine wave signal; The sawtooth wave generator is used to generate the sawtooth carrier signal; the comparator is configured to generate a level signal based on the sine wave signal and the sawtooth wave signal, and transmit the level signal to the first level converter; The first level converter is configured to generate the reference square wave signal according to the level signal.

18. The touch control chip according to claim 17, wherein: The signal generation module also includes a loop control unit and a loop filter; A first input terminal of the loop control unit is connected to the output terminal of the sine wave generator, a second input terminal of the loop control unit is connected to the output terminal of the filter module, an output terminal of the loop control unit is connected to the input terminal of the loop filter, and an output terminal of the loop filter is connected to the negative input terminal of the comparator; the loop control unit being configured to adjust the waveform of the sine wave signal output by the sine wave generator according to the touch drive signal output by the filter module, and input the adjusted sine wave signal into the loop filter; The loop filter is used to filter the adjusted sine wave signal.

19. The touch control chip according to any one of claims 10 to 12, characterized in that: The signal generation module includes a sine wave frequency and amplitude control unit, a carrier frequency and amplitude control unit, a carrier spread spectrum unit, a digital comparison unit and a second level converter; The carrier frequency spreading unit is connected to the carrier frequency amplitude control unit, the sine wave frequency amplitude control unit and the carrier frequency spreading unit are respectively connected to two input terminals of the digital comparison unit, and the output terminal of the digital comparison unit is connected to the input terminal of the second level converter; The sine wave frequency and amplitude control unit is used to generate the sine wave signal according to the sine wave data stored in the memory lookup table; The carrier frequency amplitude control unit is used to generate a sawtooth carrier sub-signal according to the carrier data stored in the memory lookup table; The carrier spreading unit is configured to perform a spreading process on the sawtooth carrier sub-signal to obtain the sawtooth carrier signal; The digital comparison unit is configured to compare the sine wave signal and the sawtooth carrier signal, and output a comparison result to the second level converter; The second level converter is configured to generate the reference square wave signal according to the comparison result.

20. The touch control chip according to any one of claims 10 to 12, characterized in that: Also includes: Loop feedback module; One end of the loop feedback module is connected to the output end of the filtering module, and the other end of the loop feedback module is connected to the power supply of the signal amplification module; The loop feedback module is used to perform closed-loop adjustment on the power supply of the signal amplification module according to the touch driving signal output by the filtering module.

21. The touch control chip according to claim 13, wherein: The first switch tube is a PMOS tube, and the second switch tube is an NMOS tube.

22. The touch control chip according to claim 15, characterized in that: The third switch tube and the fifth switch tube are PMOS tubes, and the fourth switch tube and the sixth switch tube are NMOS tubes.

23. A touch control driving device, characterized in that: include: A filter module and a touch control chip as described in any one of claims 1 to 22; The filter module is connected to the output end of the touch chip; The filtering module is used to filter the driving square wave signal transmitted by the touch chip to obtain at least one touch driving signal with a sine wave waveform.

24. A vehicle-mounted touch screen, characterized in that: include: A plurality of driving electrodes and a touch driving device as claimed in claim 23; A plurality of driving electrodes are connected to the fifth pin of the touch chip, and different driving electrodes are connected to different fifth pins; The driving electrodes are used to receive the touch driving signals output by the touch driving device, so that the vehicle-mounted touch screen recognizes touch commands, wherein the driving electrodes are horizontal electrodes and / or vertical electrodes arranged on the touch screen or touch pad.

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