WO2022183451A1 - 触控驱动电路、驱动芯片以及触控显示装置 - Google Patents

触控驱动电路、驱动芯片以及触控显示装置 Download PDF

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Publication number
WO2022183451A1
WO2022183451A1 PCT/CN2021/079158 CN2021079158W WO2022183451A1 WO 2022183451 A1 WO2022183451 A1 WO 2022183451A1 CN 2021079158 W CN2021079158 W CN 2021079158W WO 2022183451 A1 WO2022183451 A1 WO 2022183451A1
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Prior art keywords
switch
voltage
energy storage
positive
storage capacitor
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English (en)
French (fr)
Inventor
孔晨阳
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Priority to PCT/CN2021/079158 priority Critical patent/WO2022183451A1/zh
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • an embodiment of the present application provides a touch drive circuit for outputting a drive signal to drive drive electrodes of a touch display device, including: a voltage generation circuit and a switch circuit; the voltage generation circuit and the switch circuit electrical connection;
  • the voltage generating circuit includes at least one energy storage capacitor; the at least one energy storage capacitor is used to store the charges released by the driving electrodes and transfer the stored charges to the driving electrodes;
  • the voltage generating circuit further includes a power supply voltage generating circuit, a first energy storage capacitor and a second energy storage capacitor;
  • the power supply voltage generating circuit is used for generating the power supply voltage
  • the switch circuit is further configured to control the driving electrode to be connected to the second energy storage capacitor within a sixth time period, and the second energy storage capacitor is used to transfer the stored charge to the driving electrode , so that the voltage across the driving electrode is equal to the third positive voltage; in the seventh period, the driving electrode is controlled to be connected in series with the first energy storage capacitor and the second energy storage capacitor, and the first energy storage capacitor is connected in series.
  • the energy storage capacitor is connected in reverse series with the second energy storage capacitor, and the first energy storage capacitor and the second energy storage capacitor are used to transfer the stored charge to the driving electrode, so that the two ends of the driving electrode are a voltage equal to the second positive voltage; and controlling the drive electrode to be connected to the first energy storage capacitor within an eighth period, the first energy storage capacitor being used to transfer the stored charge to the drive electrode, The voltage across the drive electrodes is made equal to the first positive voltage.
  • the switch circuit further includes a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, and a fifth switch circuit;
  • the first switch circuit is turned on; during the second period of time, the second switch circuit is turned on; during the third period of time, the third switch circuit is turned on ;
  • the fourth switch circuit is turned on; during the fifth period, the fifth switch circuit is turned on; during the sixth period, the fourth switch circuit is turned on During the seventh period, the third switch circuit is conducting; during the eighth period, the second switch circuit is conducting;
  • the first switch circuit further includes a first switch S 1 ; the second switch circuit further includes a second switch S 2 ; the third switch circuit further includes a third switch S 3 and a fourth switch S 4 ; the fourth switch circuit further includes a fifth switch S5 and a sixth switch S6 ; the fifth switch circuit further includes a seventh switch S7;
  • the first end of the third switch S3 is connected to the second end of the second energy storage capacitor, and the second end of the third switch S3 is connected to the driving electrode;
  • the first end of the fourth switch S4 is connected to the first end of the second energy storage capacitor, and the second end of the fourth switch S4 is connected to the first end of the first energy storage capacitor;
  • the first end of the sixth switch S6 is connected to the first end of the second energy storage capacitor, and the second end of the sixth switch S6 is connected to the driving electrode;
  • the first terminal of the seventh switch S7 is connected to the ground terminal GND, and the second terminal of the seventh switch S7 is connected to the driving electrode;
  • the second terminal of the first energy storage capacitor is connected to the ground terminal GND.
  • the first period only the first switch S 1 is closed; in the second period, only the second switch S 2 is closed; in the third period, only the The third switch S3 and the fourth switch S4 are closed; in the fourth period, only the fifth switch S5 and the sixth switch S6 are closed; in the fifth period, Only the seventh switch S 7 is closed; in the sixth period, only the fifth switch S 5 and the sixth switch S 6 are closed; in the seventh period, only the third switch S 3 and the fourth switch S 4 are closed; in the eighth period, only the second switch S 2 is closed.
  • the power supply voltage generating circuit is used for generating the power supply voltage
  • the switch circuit is further configured to simultaneously control the positive phase drive electrode to be connected to the power supply voltage generating circuit, the negative phase drive electrode to be connected to the ground terminal GND, and the power supply voltage to the positive phase
  • the driving electrode is charged, and the negative-phase driving electrode discharges the ground terminal GND, so that the voltage across the positive driving electrode is equal to the power supply voltage, and the voltage across the negative-phase driving electrode is equal to the zero voltage;
  • the positive-phase driving electrode, the third energy storage capacitor, and the negative-phase driving electrode are controlled to be connected in series within two time periods, and the positive-phase driving electrode and the third energy storage capacitor are connected in reverse series, and the positive-phase driving electrode is connected in reverse series with the third energy storage capacitor.
  • the driving electrode charges the negative-phase driving electrode through the third storage capacitor, so that the voltage across the positive-phase driving electrode is equal to the first positive voltage, and the voltage across the negative-phase driving electrode is equal to the first positive voltage.
  • Three positive voltages control the positive phase drive electrode, the third energy storage capacitor, and the negative phase drive electrode in parallel in a third period, and the positive phase drive electrode is connected to the third energy storage capacitor and the The negative-phase driving electrodes are charged, so that the voltage across the positive-phase driving electrodes is equal to the voltage across the negative-phase driving electrodes and is equal to the second positive voltage; the positive-phase driving electrodes, all the The third energy storage capacitor and the negative phase driving electrode are connected in series, and the positive phase driving electrode is connected in positive series with the third energy storage capacitor, and the positive phase driving electrode is connected to the third energy storage capacitor through the third energy storage capacitor.
  • the switch circuit is further configured to control the positive-phase driving electrode, the third energy storage capacitor, and the negative-phase driving electrode in series within a sixth period, and the positive-phase driving electrode is connected to the The third energy storage capacitor is connected in series in the positive direction, and the negative phase driving electrode charges the positive phase driving electrode through the third energy storage capacitor, so that the voltage across the negative phase driving electrode is equal to the fourth positive voltage, and the The voltage across the positive-phase driving electrodes is equal to the fifth positive voltage; the positive-phase driving electrodes, the third energy storage capacitors, and the negative-phase driving electrodes are controlled to be connected in parallel in the seventh period, and the negative-phase driving electrodes are connected to all charging the third energy storage capacitor and the positive-phase drive electrode so that the voltage across the positive-phase drive electrode is equal to the voltage across the negative-phase drive electrode and equal to the second positive voltage; and at the eighth time period Internally control the positive phase drive electrode, the third energy storage capacitor and the negative phase drive electrode in series, and the positive phase drive electrode and the third energy storage capacitor are connected
  • the fourth positive voltage is higher than the fifth positive voltage and lower than the power supply voltage.
  • the switch circuit further includes a sixth switch circuit, a seventh switch circuit, an eighth switch circuit, a ninth switch circuit and a tenth switch circuit;
  • the sixth switch circuit is turned on; during the second period of time, the seventh switch circuit is turned on; during the third period of time, the eighth switch circuit is turned on ; in the fourth period, the ninth switch circuit is turned on; in the fifth period, the tenth switch circuit is turned on; in the sixth period, the ninth switch circuit is turned on During the seventh time period, the eighth switch circuit is turned on; during the eighth time period, the seventh switch circuit is turned on.
  • the sixth switch circuit further includes an eighth switch S 8 and a ninth switch S 9 ;
  • the seventh switch circuit further includes a tenth switch S 10 and an eleventh switch S 11 ;
  • the eighth switch The circuit further includes a twelfth switch S 12 , a thirteenth switch S 13 and a fourteenth switch S 14 ;
  • the ninth switch circuit further includes a fifteenth switch S 15 and a sixteenth switch S 16 ;
  • the tenth switch The switch circuit further includes a seventeenth switch S17 and an eighteenth switch S18;
  • the first end of the eighth switch S8 is connected to the power supply voltage generating circuit, and the second end of the eighth switch S8 is connected to the positive-phase driving electrode;
  • the first terminal of the ninth switch S9 is connected to the ground terminal GND, and the second terminal of the ninth switch S9 is connected to the negative-phase driving electrode;
  • the first end of the tenth switch S10 is connected to the first end of the third energy storage capacitor, and the second end of the tenth switch S10 is connected to the positive-phase driving electrode;
  • the first end of the eleventh switch S11 is connected to the second end of the third energy storage capacitor, and the second end of the eleventh switch S11 is connected to the negative-phase driving electrode;
  • the first end of the twelfth switch S12 is connected to the first end of the third energy storage capacitor, and the second end of the twelfth switch S12 is connected to the positive-phase driving electrode;
  • the first end of the thirteenth switch S13 is connected to the first end of the third energy storage capacitor, and the second end of the thirteenth switch S13 is connected to the negative phase driving electrode;
  • the first terminal of the fourteenth switch S14 is connected to the second terminal of the third energy storage capacitor, and the second terminal of the fourteenth switch S14 is connected to the ground terminal GND;
  • the first end of the fifteenth switch S15 is connected to the second end of the third energy storage capacitor, and the second end of the fifteenth switch S15 is connected to the positive-phase driving electrode;
  • the first end of the sixteenth switch S16 is connected to the first end of the third energy storage capacitor, and the second end of the sixteenth switch S16 is connected to the negative-phase driving electrode;
  • the first terminal of the seventeenth switch S17 is connected to the ground terminal GND, and the second terminal of the seventeenth switch S17 is connected to the positive-phase driving electrode;
  • the first terminal of the eighteenth switch S18 is connected to the power supply voltage generating circuit, and the second terminal of the eighteenth switch S18 is connected to the negative-phase driving electrode.
  • the amplitude of the first positive voltage minus the amplitude of the third positive voltage is equal to two of the third energy storage capacitor. terminal voltage value;
  • the magnitude of the second positive voltage is equal to the voltage across the third energy storage capacitor
  • the magnitude of the fourth positive voltage minus the magnitude of the fifth positive voltage is equal to the voltage across the third energy storage capacitor.
  • the fourth positive voltage is equal to the first positive voltage
  • the fifth positive voltage equal to the third positive voltage
  • an embodiment of the present application provides a touch driving chip, including the touch driving circuit according to the first aspect or any optional manner of the first aspect.
  • an embodiment of the present application provides a touch display device, including the touch driving chip as described in the second aspect.
  • touch driving chip described in the second aspect and the touch display device described in the third aspect both apply the corresponding touch driving circuit provided above. Therefore, they can achieve For the beneficial effects, reference may be made to the beneficial effects of the corresponding touch driving circuits provided above, which will not be repeated here.
  • FIG. 1 is a schematic structural diagram of a conventional touch driving circuit
  • FIG. 2 is a schematic diagram of a signal waveform of a driving signal output by the touch driving circuit shown in FIG. 1 in one cycle;
  • FIG. 3 is a schematic structural diagram of a touch driving circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another touch driving circuit provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the working principle of the touch driving circuit shown in FIG. 4;
  • FIG. 6 is a schematic diagram of a signal waveform of a driving signal output by the touch driving circuit shown in FIG. 4 in one cycle;
  • FIG. 7 is a schematic diagram of a circuit model of the touch driving circuit shown in FIG. 4;
  • FIG. 8 is a schematic structural diagram of another touch driving circuit provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of the working principle of the touch driving circuit shown in FIG. 8;
  • FIG. 10 is a schematic diagram of a signal waveform of a driving signal output by the touch driving circuit shown in FIG. 8 in one cycle.
  • Embodiments of the present application provide a touch driving circuit, a driving chip and a touch display device.
  • the touch driving circuit can be applied to a capacitive touch display device to drive the driving electrodes of the touch display device.
  • the touch display apparatus may further include a display device, and examples of the display device include a liquid crystal (LCD) display, an organic light emitting (OLED) display, a plasma (PDP) display, and a cathode ray (CRT) display.
  • LCD liquid crystal
  • OLED organic light emitting
  • PDP plasma
  • CTR cathode ray
  • FIG. 3 a schematic structural diagram of a touch driving circuit provided by an embodiment of the present application; wherein, the resistance R tx represents the driving impedance, including the equivalent impedance of the driving electrodes and the touch driving circuit, and the capacitance CL represents the driving Equivalent capacitance of the electrodes.
  • the touch drive circuit 20 includes a voltage generation circuit 201 and a switch circuit 202, and the voltage generation circuit 201 is electrically connected to the switch circuit 202; the voltage generation circuit 201 includes at least one energy storage capacitor (not shown in the figure), the at least one energy storage capacitor The capacitor can store the charges released by the driving electrodes and transfer the stored charges to the driving electrodes; the switching circuit 202 can control the voltage generating circuit 201 to periodically output the power supply voltage, the first positive voltage, the second positive voltage, the third positive voltage and the Zero voltage; wherein, the first positive voltage, the second positive voltage and the third positive voltage are the voltages provided by the at least one energy storage capacitor, and their amplitudes satisfy the following relationship: power supply voltage>first positive voltage>second positive voltage Voltage > third positive voltage > zero voltage.
  • the charge released when the driving electrode is discharged can be recycled, and no additional power consumption is generated during the charge transfer process between the at least one energy storage capacitor and the driving electrode, and Multiple intermediate levels are introduced between the power supply voltage and zero voltage, which effectively reduces the voltage variation across the drive electrodes when the drive electrodes are directly charged by the power supply voltage, effectively reducing the drive of the touch drive circuit. power consumption.
  • the switch circuit can further control the driving electrode to be connected to the second energy storage capacitor within the sixth period, and the second energy storage capacitor can transfer the stored charge to the driving electrode, so that the driving electrode can be driven
  • the voltage at both ends of the electrode is equal to the above-mentioned third positive voltage; in the seventh period, the driving electrode is controlled to be connected in series with the first energy storage capacitor and the second energy storage capacitor, and the first energy storage capacitor and the second energy storage capacitor are connected in reverse series, and the first energy storage capacitor and the second energy storage capacitor are connected in reverse series.
  • An energy storage capacitor and a second energy storage capacitor can transfer the stored charge to the driving electrode, so that the voltage across the driving electrode is equal to the above-mentioned second positive voltage; and the driving electrode is controlled to be connected to the first energy storage capacitor in the eighth time period,
  • the first energy storage capacitor can transfer the stored charge to the driving electrode, so that the voltage across the driving electrode is equal to the above-mentioned first positive voltage.
  • the embodiments of the present application provide a schematic structural diagram of another touch drive circuit, as shown in FIG. 4 ; wherein, the resistance R tx represents the drive impedance (including the Effective impedance), the capacitance CL represents the equivalent capacitance of the driving electrode.
  • the first switch circuit further includes a first switch S 1 ; the second switch circuit further includes a second switch S 2 ; the third switch circuit further includes a third switch S 3 and a fourth switch S 4 ;
  • the four-switch circuit further includes a fifth switch S 5 and a sixth switch S 6 ; the fifth switch circuit further includes a seventh switch S 7 .
  • each element in the touch driving circuit 30 is as follows: the first end of the first switch S1 is connected to the power supply voltage generating circuit to connect to the power supply voltage V DD , and the second end of the first switch S1 is connected to to the drive electrode; the first end of the second switch S2 is connected to the first end of the first energy storage capacitor C S1 , the second end of the second switch S2 is connected to the drive electrode; the third end of the third switch S3 One end is connected to the second end of the second energy storage capacitor C S2 , the second end of the third switch S 3 is connected to the driving electrode; the first end of the fourth switch S 4 is connected to the second end of the second energy storage capacitor C S2 The first end, the second end of the fourth switch S4 is connected to the first end of the first energy storage capacitor C S1 ; the first end of the fifth switch S5 is connected to the second end of the second energy storage capacitor C S2 , The second end of the fifth switch S5 is connected to the ground GND; the first end of
  • FIG. 5 is a schematic diagram of the working principle of the touch driving circuit shown in FIG. 4 , wherein the voltage across the first energy storage capacitor C S1 is denoted as V C1 , and the voltage across the second energy storage capacitor C S2 is denoted as V C2 . It can be seen that in the period t1 , only the first switch circuit is turned on, that is, only the first switch S1 is closed, and the power supply voltage V DD charges the capacitor CL until the voltage across the capacitor CL is equal to the power supply voltage V DD .
  • the capacitor CL discharges the first energy storage capacitor C S1 , and the first energy storage capacitor C S1 stores the charge released by the capacitor CL , until the voltage across the capacitor CL is equal to the first positive voltage.
  • the touch drive circuit provided by the embodiment of the present application can operate cyclically according to the above-mentioned eight time periods as one cycle, and the voltage V C1 across the first energy storage capacitor C S1 and the voltage V C2 across the second energy storage capacitor C S2 are in this During the working process of the cycle, it will gradually establish to a stable value, and when the voltages at both ends of the first energy storage capacitor C S1 and the second energy storage capacitor C S2 are established to a stable value, the amplitude of the first positive voltage is equal to the first energy storage capacitor.
  • the voltage value V C1 across the energy storage capacitor C S1 and the magnitude of the second positive voltage is equal to the voltage value V C1 across the first energy storage capacitor C S1 minus the voltage value V C2 across the second energy storage capacitor C S2 , which is equal to V C1 -V C2
  • the magnitude of the third positive voltage is equal to the voltage value V C2 across the second energy storage capacitor CS2 .
  • the capacitance values of the first energy storage capacitor C S1 and the second energy storage capacitor C S2 are greater than 50 to 100 times the capacitance value of the capacitor CL , it can be determined that the first energy storage capacitor C S1 and the second energy storage capacitor C S2 The capacitance value of the capacitor CS2 is much larger than the capacitance value of the capacitor CL .
  • the charge transfer between the first energy storage capacitor C S1 , the second energy storage capacitor C S2 , and the capacitor CL in the above-mentioned eight time periods is analyzed to calculate the first energy storage capacitor C S1
  • the specific values of the first positive voltage, the second positive voltage and the third positive voltage when the voltages across the second energy storage capacitor CS2 and the second energy storage capacitor C S2 are established to a stable value.
  • the final value of the voltage across the capacitor CL is equal to the power supply voltage V DD .
  • the initial value of the voltage across the capacitor CL is V DD
  • the final value is recorded as V x1
  • the initial value of the voltage across the first energy storage capacitor C S1 is V C1
  • the final value is also V x1
  • V x1 (C S1 *V C1 +C L *V DD )/(C S1 +C L ). (Equation 2)
  • the initial value of the voltage across the capacitor CL is V x1 , and the final value is V x2 ;
  • the initial value of the voltage across the first energy storage capacitor C S1 is V x1 , and the final value is V x3 ;
  • the second value is V x1 ;
  • the initial value of the voltage across the energy storage capacitor CS2 is V C2 , and the final value is V x3 -V x2 ; according to the law of conservation of charge, the above voltage value and capacitance value satisfy the following relationship:
  • the initial value of the voltage across the capacitor CL is V x3 -V x2 , and the final value is V x4 ;
  • the initial value of the voltage across the second energy storage capacitor C S2 is V x2 , and the final value is also V x4 ;
  • the capacitor CL is discharged to the ground until the voltage at both ends is equal to zero voltage, so in the t6 period, the initial value of the voltage across the capacitor CL is 0, and the final value is V x5 .
  • the second energy storage capacitor The initial value of the voltage across C S2 is V x4 , and the final value is also V x5 ; according to the law of conservation of charge, the above voltage value and capacitance value satisfy the following relationship:
  • the initial value of the voltage across the capacitor CL is V x5 , and the final value is V x6 ;
  • the initial value of the voltage across the first energy storage capacitor C S1 is V x3 , and the final value is V x7 ;
  • the initial value of the voltage across the energy storage capacitor CS2 is V x5 , and the final value is V x7 -V x6 ; according to the law of conservation of charge, the above voltage value and capacitance value satisfy the following relationship:
  • the initial value of the voltage at both ends of the capacitor CL is Vx6
  • the final value is Vx8
  • the initial value of the voltage at both ends of the first energy storage capacitor C S1 is Vx7
  • the final value is also Vx8 ; according to According to the law of conservation of charge, the above voltage value and capacitance value satisfy the following relationship:
  • the current when the touch drive circuit charges or discharges the drive electrodes is:
  • Equation 22 the energy consumed by the driving impedance RL in a period of time can be obtained as:
  • the voltage across the capacitor CL often changes in a non-ideal state, that is, the voltage across the capacitor CL will not change to the target stable value at the moment when the switch circuit is turned on. Therefore, in order to ensure the implementation of the present application
  • the drive power consumption and the amplitude of the output drive signal of the touch drive circuit provided in the example can reach the preset target value, and the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit, the The conduction time of the five-switch circuit is greater than or equal to the time for the voltage across the driving electrodes to establish to a stable value within a corresponding period of time.
  • the orthogonal coding method can also be used, that is, at the same time, some of the driving electrodes are driven with a positive-phase driving waveform, which is called a positive-phase driving electrode, while another part of the driving electrodes is driven by a negative-phase driving waveform.
  • the driving waveform of the phase is driven, which is called the negative phase driving electrode.
  • the embodiment of the present application also provides a touch driving circuit, which can drive the positive-phase driving electrodes and the negative-phase driving electrodes at the same time, so as to better adapt to touch detection using the orthogonal coding method application.
  • the voltage generating circuit may further include a power supply voltage generating circuit and a third energy storage capacitor.
  • the power supply voltage generating circuit can generate the above-mentioned power supply voltage.
  • the switch circuit can further control the positive phase drive electrode to be connected to the power supply voltage generating circuit, the negative phase drive electrode to be connected to the ground terminal GND, the power supply voltage to charge the positive phase drive electrode, and the negative phase drive electrode to discharge to the ground terminal GND during the first period , so that the voltage at both ends of the positive-phase driving electrode is equal to the above-mentioned power supply voltage, and the voltage at both ends of the negative-phase driving electrode is equal to zero voltage; in the second period, the positive-phase driving electrode, the third energy storage capacitor, and the negative-phase driving electrode are controlled in series, and the positive-phase driving electrode is connected in series.
  • the driving electrode is connected in reverse series with the third energy storage capacitor, and the positive phase driving electrode charges the negative phase driving electrode through the third energy storage capacitor, so that the voltage at both ends of the positive phase driving electrode is equal to the above-mentioned first positive voltage, and the voltage at both ends of the negative phase driving electrode is equal to the above-mentioned first positive voltage.
  • the voltage is equal to the above-mentioned third positive voltage; in the third period of time, the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode are controlled in parallel, and the positive phase driving electrode charges the third energy storage capacitor and the negative phase driving electrode, so that the positive phase driving electrode is charged.
  • the voltage across the phase drive electrodes is equal to the voltage across the negative phase drive electrodes, and is equal to the above-mentioned second positive voltage; the positive phase drive electrodes, the third energy storage capacitor, and the negative phase drive electrodes are controlled in series in the fourth period, and the positive phase drive electrodes are connected in series.
  • the capacitors are connected in series in the positive direction, and the negative-phase driving electrode charges the positive-phase driving electrode through the third energy storage capacitor, so that the voltage across the negative-phase driving electrode is equal to the fourth positive voltage, and the voltage across the positive-phase driving electrode is equal to the fifth positive voltage;
  • the positive phase drive electrode, the third energy storage capacitor and the negative phase drive electrode are controlled in parallel, and the negative phase drive electrode charges the third energy storage capacitor and the positive phase drive electrode, so that the voltage across the positive phase drive electrode is equal to the negative phase drive electrode
  • the voltage at both ends of the electrode is equal to the above-mentioned second positive voltage; and in the eighth time period, the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode are controlled in series, and the positive phase driving electrode and the third energy storage capacitor are connected in reverse series , the negative phase drive electrode charges the positive phase drive electrode through the third energy storage capacitor, so that the voltage across the positive phase drive electrode is equal to the fourth positive voltage, and the voltage across the negative phase drive electrode is equal to the fifth positive
  • the voltage across the positive-phase driving electrodes first increases from zero voltage to the fifth positive voltage, while the voltage across the negative-phase driving electrodes decreases from the power supply voltage to the fourth positive voltage; the voltage across the positive-phase driving electrodes is again From the fifth positive voltage to the second positive voltage, while the voltage across the negative-phase drive electrodes drops from the fourth positive voltage to the second positive voltage; and then the voltage across the positive-phase drive electrodes rises from the second positive voltage to the first Four positive voltages, while the voltage across the negative-phase driving electrodes drops from the second positive voltage to the fifth positive voltage, that is, during this process, the positive-phase driving electrodes are in a charged state, and the negative-phase driving electrodes are in a discharging state.
  • the switch circuit may further include: a sixth switch circuit, a seventh switch circuit, an eighth switch circuit, a ninth switch circuit, and a tenth switch circuit.
  • the sixth switch circuit In order to make the driving signal have the above-mentioned stepped signal waveform, it can be controlled: in the above-mentioned first period of time, the sixth switch circuit is turned on; in the above-mentioned second period of time, the seventh switch circuit is turned on; in the above-mentioned third period of time, The eighth switch circuit is turned on; in the fourth time period, the ninth switch circuit is turned on; in the fifth time period, the tenth switch circuit is turned on; in the sixth time period, the ninth switch circuit is turned on; During the seventh period, the eighth switch circuit is turned on; during the eighth period, the seventh switch circuit is turned on; when any one of the switch circuits is turned on, the other four switch circuits are turned off.
  • a control circuit can be used to control the switch circuit, so that the switch circuit can be periodically cyclically turned on according to the above turn-on sequence, thereby controlling the drive signal output by the touch drive circuit to have the above-mentioned stepped signal waveform.
  • the control circuit may be integrated with the touch driving circuit on the same chip, or may be independent of the touch driving circuit, that is, the control circuit and the touch driving circuit may be integrated in different chips, which are not limited in the embodiments of the present application.
  • the positive phase drive electrode the positive phase drive electrode
  • the first end of the ninth switch S9 is connected to the ground GND, the second end of the ninth switch S9 is connected to the negative phase drive electrode
  • the first end of the tenth switch S10 is connected to the The first end of the three energy storage capacitors C S3 , the second end of the tenth switch S10 is connected to the positive phase driving electrode
  • the first end of the eleventh switch S11 is connected to the second end of the third energy storage capacitor C S3 terminal, the second terminal of the eleventh switch S11 is connected to the negative phase drive electrode
  • the first terminal of the twelfth switch S12 is connected to the first terminal of the twelfth switch S12 and the first terminal of the twelfth switch S12 is connected to the twelfth switch S12
  • the second end of the thirteenth switch S13 is connected to the positive phase drive electrode;
  • the first end of the thirteenth switch S13 is connected to the first end of the third energy storage capacitor C S3 , and the second
  • FIG. 9 is a schematic diagram of the working principle of the touch drive circuit shown in FIG. 8 ; in order to clearly show the touch drive circuit between the third energy storage capacitor C S3 , the positive phase drive electrode, and the negative phase drive electrode during the working process In the figure, the resistance R tx,p and the resistance R tx,n are omitted.
  • V C3 The voltage across the third energy storage capacitor C S3 is denoted as V C3
  • V p the voltage across the capacitor C L,p
  • V n the capacitance
  • C L,p /C L,n k(k>0).
  • the eighth switch circuit is turned on , that is, only the twelfth switch S 12 , the thirteenth switch S 13 and the fourteenth switch S 14 are closed at the same time, the capacitor CL,n and the third energy storage capacitor C S3 and capacitor C L,p are connected in parallel, and the capacitor C L,n charges the third energy storage capacitor C S3 and the capacitor C L,p until the voltages across the capacitor C L,p and the capacitor C L,n are equal, and equal to the second positive voltage.
  • the touch driving circuit provided by the embodiment of the present application can cyclically work according to the above-mentioned eight time periods as one cycle.
  • the voltage V C3 across the third energy storage capacitor C S3 will gradually build up to a stable value during this cycle of operation, and when the voltage across the third energy storage capacitor C S3 is established to a stable value, the first positive voltage
  • the amplitude minus the third positive voltage is equal to the voltage value V C3 at both ends of the third energy storage capacitor C S3 ;
  • the amplitude of the second positive voltage is equal to the voltage value V C3 at both ends of the third energy storage capacitor C S3 ;
  • the fourth The magnitude of the positive voltage minus the magnitude of the fifth positive voltage is equal to the voltage value V C3 across the third energy storage capacitor CS3 .
  • the capacitance value of the third energy storage capacitor C S3 is much larger than the capacitance values of the capacitors CL ,p and CL ,n , when the voltage across the third energy storage capacitor C S3 is established When stable, the second voltage value is approximately equal to V DD /2.
  • the capacitance value of the third energy storage capacitor C S3 is greater than 50 to 100 times the capacitance values of the capacitors CL,p and CL ,n , it can be determined that the capacitance value of the third energy storage capacitor C S3 is much larger than Capacitance value of capacitor C L,p and capacitor C L,n .
  • the initial value of the voltage across the capacitor CL,p is V DD /2
  • the final value is recorded as V y1
  • the initial value of the voltage across the capacitor CL ,n is V DD /2
  • the final value is recorded as V y2 ; according to the law of conservation of charge, the above voltage value and capacitance value satisfy the following relationship:
  • the driving power consumption of the touch driving circuit in one cycle T is:
  • the touch driving circuit provided by the embodiments of the present application can only add an external capacitor (third energy storage capacitor), so as to effectively reduce the driving power consumption of the touch driving circuit, thereby saving the area and cost of the touch detection PCB, and can It is well suited for touch detection application scenarios where orthogonal coding is used and the number of positive and negative code channels is symmetrical.
  • the driving voltages on the positive-phase driving electrodes and the negative-phase driving electrodes change synchronously in opposite trends, and the waveforms of the driving signals are all stepped; the magnitude relationship of each driving voltage in the figure satisfies: power supply voltage>fourth positive voltage> The first positive voltage>the second positive voltage>the fifth positive voltage>the third positive voltage>zero voltage, wherein the difference between the first positive voltage and the third positive voltage is equal to the difference between the fourth positive voltage and the fifth positive voltage and equal to the second positive voltage.
  • the magnitude relationship of each driving voltage satisfies: the first positive voltage and the fourth positive voltage are approximately equal to 3/ 4V DD , the third positive voltage and the fifth positive voltage are approximately equal to 1/4V DD , and the difference between the first positive voltage or the fourth positive voltage and the second positive voltage is equal to the second positive voltage and the third positive voltage or The difference between the fifth positive voltages; when k>1, and the voltage across the third energy storage capacitor C S3 is stable, the magnitude relationship of each driving voltage satisfies: power supply voltage>first positive voltage>fourth positive voltage >second positive voltage>third positive voltage>fifth positive voltage>zero voltage, wherein the difference between the first positive voltage and the third positive voltage is equal to the difference between the fourth positive voltage and the fifth positive voltage, and equal to the second positive voltage.
  • Fig. 10 is a schematic diagram of an ideal coding signal waveform.
  • the voltages across the capacitors CL,p and CL ,n often change in a non-ideal state, that is, The voltage across the capacitor CL,p and the capacitor CL,n will not change to the target stable value at the moment when the switch circuit is turned on.
  • the amplitude of the signal can reach the preset target value, and the conduction time of the sixth switch circuit, the seventh switch circuit, the eighth switch circuit, the ninth switch circuit and the tenth switch circuit can be set to be greater than or equal to the positive phase drive electrode, The time for the voltage across the negative phase drive electrode to build up to a stable value within the corresponding period.
  • An embodiment of the present application provides a touch driving chip, and the touch driving chip includes the touch driving circuit provided in the above-mentioned embodiment. It should be noted that the touch driving chip may also include other circuits, such as a control circuit, which can be used for The control switch circuit is periodically turned on in a preset manner.
  • Embodiments of the present application provide a touch display device, where the touch display device includes the touch drive chip provided by the above embodiments.

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Abstract

本申请提供一种触控驱动电路、驱动芯片以及触控显示装置。该触控驱动电路用于输出驱动信号对触控显示装置的驱动电极进行驱动，该触控驱动电路包括：电压产生电路和开关电路；电压产生电路与开关电路电连接；电压产生电路包括至少一个储能电容；至少一个储能电容用于存储驱动电极释放的电荷，以及将存储的电荷转移给驱动电极；开关电路用于控制电压产生电路周期性地输出电源电压、第一正电压、第二正电压、第三正电压和零电压；第一正电压、第二正电压和第三正电压为至少一个储能电容提供的电压。该触控驱动电路具有较低的功耗。

Description

触控驱动电路、驱动芯片以及触控显示装置 技术领域
本申请实施例涉及电子电路技术领域，尤其涉及一种触控驱动电路、驱动芯片以及触控显示装置。
背景技术
电容式触控显示装置，包括由驱动电极TX和感应电极RX横纵交错组成的触控电极阵列。通过对驱动电极TX进行驱动，并接收感应电极RX感测到的信号，可以检测出驱动电极TX和感应电极RX之间的耦合电容的电容变化量，进而判断用户的操作。
如图1所示，为一种传统的触控驱动电路的结构示意图。该触控驱动电路利用由PMOS管101和NMOS管102组成的反相器提供驱动信号，以实现对驱动电极TX进行驱动。其中，电压V DD为电源电压，电容C L表示驱动电极TX的等效电容，电阻R L表示打码时的等效阻抗(即驱动阻抗)。在该触控驱动电路输出的驱动信号的一个周期T(以下简称为一个周期T)内，电容C L从电源获取的平均电流值为：
Figure PCTCN2021079158-appb-000001
当驱动信号的频率为f(f＝1/T)时，该触控驱动电路在一个周期T内的驱动功耗为：
Figure PCTCN2021079158-appb-000002
如图2所示，为图1所示的触控驱动电路输出的驱动信号在一个周期T内的信号波形示意图。其中，阴影部分表示在一个周期T内电阻R L上的功耗，即该触控驱动电路的驱动功耗。该驱动功耗主要分为两个部分，其中一个部分为对驱动电极TX充电时电阻R L上的损耗，另一个部分为驱动电极TX放电时电阻R L上的损耗，均为
Figure PCTCN2021079158-appb-000003
目前，由于OLED(Organic Light Emitting Display，有机发光显示)技术与传统的LCD(Liquid Crystal Display，液晶显示)技术相比在显示性能方面具有很多明显的优势，例如OLED屏幕更加轻薄，并且具有广视角、耐低温、生态环保等特点，所以使得OLED屏幕得到了广泛的应用。但是，相比于LCD屏幕，OLED屏幕的负载电容(等效电容C L)的电容值明显更大，进而导致OLED屏幕的功耗增加，难以满足低功耗触控检测的需求。
发明内容
有鉴于此，本申请实施例提供了一种触控驱动电路、驱动芯片以及触控显示装置，以降低触控驱动电路的驱动功耗。
第一方面，本申请实施例提供一种触控驱动电路，用于输出驱动信号对触控显示装置的驱动电极进行驱动，包括：电压产生电路和开关电路；所述电压产生电路与所述开关电路电连接；
所述电压产生电路包括至少一个储能电容；所述至少一个储能电容用于存储所述驱动电极释放的电荷，以及将存储的电荷转移给所述驱动电极；
所述开关电路用于控制所述电压产生电路周期性地输出电源电压、第一正电压、第二正电压、第三正电压和零电压；
所述第一正电压、所述第二正电压和所述第三正电压为所述至少一个储能电容提供的电压，并且所述电源电压高于所述第一正电压，所述第一正电压高于所述第二正电压，所述第二正电压高于所述第三正电压，所述第三正电压高于所述零电压。
通过增设至少一个储能电容，并利用该至少一个储能电容存储驱动电极放电时释放出的电荷，以及将存储的电荷转移回驱动电极以实现对驱动电极进行充电，相当于利用该至少一个储能电容对驱动电极释放的电荷进行回收利用，所以在这一电荷转移过程中不会造成额外的功耗，并且在电源电压和零电压之间引入了多个中间电平，包括第一正电压、第二正电压和第三正电压，从而等效减小了直接由电源电压对驱动电极进行驱动时，驱动电极两端的电压变化量，进而降低了该触控驱动电路的实际功耗。
可选地，所述电压产生电路进一步包括电源电压产生电路，第一储能电容以及第二储能电容；
所述电源电压产生电路用于产生所述电源电压；
所述开关电路进一步用于在第一时段内控制所述驱动电极连接至所述电源电压产生电路，所述电源电压对所述驱动电极充电，使得所述驱动电极两端的电压等于所述电源电压；在第二时段内控制所述驱动电极连接至所述第一储能电容，所述第一储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第一正电压；在第三时段内控制所述驱动电极与所述第一储能电容、所述第二储能电容串联，并且所述第一储能电容与所述第二储能电容反向串联，所述第一储能电容和所述第二储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第二正电压；在第四时段内控制所述驱动电极连接至所述第二储能电容，所述第二储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第三正电压；以及在第五时段内控制所述驱动电极连接至地端GND，所述驱动电极对所述地端GND放电，使得所述驱动电极两端的电压等于所述零电压。
可选地，所述开关电路进一步用于在第六时段内控制所述驱动电极连接至所述第二储能电容，所述第二储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第三正电压；在第七时段内控制所述驱动电极与所述第一储能电容、所述第二储能电容串联，并且所述第一储能电容与所述第二储能电容反向串联，所述第一储能电容和所述第二储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第二正电压；以及在第八时段内控制所述驱动电极连接至所述第一储能电容，所述第一储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第一正电压。
可选地，所述开关电路进一步包括第一开关电路、第二开关电路、第三开关电路、 第四开关电路以及第五开关电路；
在所述第一时段内，所述第一开关电路导通；在所述第二时段内，所述第二开关电路导通；在所述第三时段内，所述第三开关电路导通；在所述第四时段内，所述第四开关电路导通；在所述第五时段内，所述第五开关电路导通；在所述第六时段内，所述第四开关电路导通；在所述第七时段内，所述第三开关电路导通；在所述第八时段内，所述第二开关电路导通；
所述任意一个开关电路导通时，所述其他四个开关电路均断开。
可选地，所述第一开关电路进一步包括第一开关S 1；所述第二开关电路进一步包括第二开关S 2；所述第三开关电路进一步包括第三开关S 3和第四开关S 4；所述第四开关电路进一步包括第五开关S 5和第六开关S 6；所述第五开关电路进一步包括第七开关S 7；
所述第一开关S 1的第一端连接至所述电源电压产生电路，所述第一开关S 1的第二端连接至所述驱动电极；
所述第二开关S 2的第一端连接至所述第一储能电容的第一端，所述第二开关S 2的第二端连接至所述驱动电极；
所述第三开关S 3的第一端连接至所述第二储能电容的第二端，所述第三开关S 3的第二端连接至所述驱动电极；
所述第四开关S 4的第一端连接至所述第二储能电容的第一端，所述第四开关S 4的第二端连接至所述第一储能电容的第一端；
所述第五开关S 5的第一端连接至所述第二储能电容的第二端，所述第五开关S 5的第二端连接至地端GND；
所述第六开关S 6的第一端连接至所述第二储能电容的第一端，所述第六开关S 6的第二端连接至所述驱动电极；
所述第七开关S 7的第一端连接至所述地端GND，所述第七开关S 7的第二端连接至所述驱动电极；
所述第一储能电容的第二端连接至所述地端GND。
可选地，在所述第一时段内，仅所述第一开关S 1闭合；在所述第二时段内，仅所述第二开关S 2闭合；在所述第三时段内，仅所述第三开关S 3和所述第四开关S 4闭合；在所述第四时段内，仅所述第五开关S 5和所述第六开关S 6闭合；在所述第五时段内，仅所述第七开关S 7闭合；在所述第六时段内，仅所述第五开关S 5和所述第六开关S 6闭合；在所述第七时段内，仅所述第三开关S 3和所述第四开关S 4闭合；在所述第八时段内，仅所述第二开关S 2闭合。
可选地，当所述第一储能电容和所述第二储能电容两端的电压均建立至稳定值时，所述第一正电压的幅值等于所述第一储能电容两端的电压值；
所述第二正电压的幅值等于所述第一储能电容两端的电压值减去所述第二储能电容两端的电压值；
所述第三正电压的幅值等于所述第二储能电容两端的电压值。
可选地，所述驱动电极进一步包括正相位驱动电极和负相位驱动电极；所述电压产生电路进一步包括电源电压产生电路和第三储能电容；
所述电源电压产生电路用于产生所述电源电压；
所述开关电路进一步用于在第一时段内同时控制所述正相位驱动电极连接至所述电源电压产生电路，所述负相位驱动电极连接至地端GND，所述电源电压对所述正相位驱动电极充电，所述负相位驱动电极对所述地端GND放电，使得所述正驱动电极两端的电压等于所述电源电压，所述负相位驱动电极两端的电压等于所述零电压；在第二时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容反向串联，所述正相位驱动电极通过所述第三储能电容对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第一正电压，所述负相位驱动电极两端的电压等于所述第三正电压；在第三时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极并联，所述正相位驱动电极对所述第三储能电容和所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述负相位驱动电极两端的电压，并且等于所述第二正电压；在第四时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容正向串联，所述正相位驱动电极通过所述第三储能电容对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第三正电压，所述负相位驱动电极两端的电压等于所述第一正电压；以及在第五时段内同时控制所述正相位驱动电极连接至所述地端GND，所述负相位驱动电极连接至所述电源电压产生电路，所述正相位驱动电极对所述地端GND放电，所述电源电压对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述零电压，所述负相位驱动电极两端的电压等于所述电源电压。
可选地，所述开关电路进一步用于在第六时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容正向串联，所述负相位驱动电极通过所述第三储能电容对所述正相位驱动电极充电，使得所述负相位驱动电极两端的电压等于第四正电压，所述正相位驱动电极两端的电压等于第五正电压；在第七时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极并联，所述负相位驱动电极对所述第三储能电容和所述正相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述负相位驱动电极两端的电压，并且等于所述第二正电压；以及在第八时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容反向串联，所述负相位驱动电极通过所述第三储能电容对所述正相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第四正电压，所述负相位驱动电极两端的电压等于所述第五正电压；
所述第四正电压高于所述第五正电压，并且低于所述电源电压。
可选地，所述开关电路进一步包括第六开关电路、第七开关电路、第八开关电路、第九开关电路以及第十开关电路；
在所述第一时段内，所述第六开关电路导通；在所述第二时段内，所述第七开关电路导通；在所述第三时段内，所述第八开关电路导通；在所述第四时段内，所述第九开关电路导通；在所述第五时段内，所述第十开关电路导通；在所述第六时段内，所述第九开关电路导通；在所述第七时段内，所述第八开关电路导通；在所述第八时 段内，所述第七开关电路导通。
所述任意一个开关电路导通时，所述其他四个开关电路均断开。
可选地，所述第六开关电路进一步包括第八开关S 8和第九开关S 9；所述第七开关电路进一步包括第十开关S 10和第十一开关S 11；所述第八开关电路进一步包括第十二开关S 12、第十三开关S 13以及第十四开关S 14；所述第九开关电路进一步包括第十五开关S 15和第十六开关S 16；所述第十开关电路进一步包括第十七开关S 17和第十八开关S 18；
所述第八开关S 8的第一端连接至所述电源电压产生电路，所述第八开关S 8的第二端连接至所述正相位驱动电极；
所述第九开关S 9的第一端连接至所述地端GND，所述第九开关S 9的第二端连接至所述负相位驱动电极；
所述第十开关S 10的第一端连接至所述第三储能电容的第一端，所述第十开关S 10的第二端连接至所述正相位驱动电极；
所述第十一开关S 11的第一端连接至所述第三储能电容的第二端，所述第十一开关S 11的第二端连接至所述负相位驱动电极；
所述第十二开关S 12的第一端连接至所述第三储能电容的第一端，所述第十二开关S 12的第二端连接至所述正相位驱动电极；
所述第十三开关S 13的第一端连接至所述第三储能电容的第一端，所述第十三开关S 13的第二端连接至所述负相位驱动电极；
所述第十四开关S 14的第一端连接至所述第三储能电容的第二端，所述第十四开关S 14的第二端连接至所述地端GND；
所述第十五开关S 15的第一端连接至所述第三储能电容的第二端，所述第十五开关S 15的第二端连接至所述正相位驱动电极；
所述第十六开关S 16的第一端连接至所述第三储能电容的第一端，所述第十六开关S 16的第二端连接至所述负相位驱动电极；
所述第十七开关S 17的第一端连接至所述地端GND，所述第十七开关S 17的第二端连接至所述正相位驱动电极；
所述第十八开关S 18的第一端连接至所述电源电压产生电路，所述第十八开关S 18的第二端连接至所述负相位驱动电极。
可选地，在所述第一时段内，仅所述第八开关S 8和所述第九开关S 9同时闭合；在所述第二时段内，仅所述第十开关S 10和所述第十一开关S 11闭合；在所述第三时段内，仅所述第十二开关S 12、所述第十三开关S 13和所述第十四开关S 14闭合；在所述第四时段内，仅所述第十五开关S 15和所述第十六开关S 16闭合；在所述第五时段内，仅所述第十七开关S 17和所述第十八开关S 18闭合；在所述第六时段内，仅所述第十五开关S 15和所述第十六开关S 16闭合；在所述第七时段内，仅所述第十二开关S 12、所述第十三开关S 13和所述第十四开关S 14闭合；在所述第八时段内，仅所述第十开关S 10和所述第十一开关S 11闭合。
可选地，当所述第三储能电容两端的电压建立至稳定值时，所述第一正电压的幅值减去所述第三正电压的幅值等于所述第三储能电容两端的电压值；
所述第二正电压的幅值等于所述第三储能电容两端的电压值；
所述第四正电压的幅值减去所述第五正电压的幅值等于所述第三储能电容两端的电压值。
可选地，当所述正相位驱动电极的等效电容值等于所述负相位驱动电极的等效电容值时，所述第四正电压等于所述第一正电压，所述第五正电压等于所述第三正电压。
第二方面，本申请实施例提供一种触控驱动芯片，包括如第一方面或第一方面的任一可选方式所述的触控驱动电路。
第三方面，本申请实施例提供一种触控显示装置，包括如第二方面所述的触控驱动芯片。
可以理解的是，上述提供的第二方面所述的触控驱动芯片和第三方面所述的触控显示装置均应用了上文所提供的对应的触控驱动电路，因此，其所能达到的有益效果可参考上文所提供的对应的触控驱动电路的有益效果，此处不再赘述。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定。下面的描述涉及附图时，不同附图中的相同数字表示相同的要素。除非有特别申明，附图中的图不构成比例限制。
图1为一种传统的触控驱动电路的结构示意图；
图2为图1所示的触控驱动电路输出的驱动信号在一个周期内的信号波形示意图；
图3为本申请实施例提供的一种触控驱动电路的结构示意图；
图4为本申请实施例提供的另一种触控驱动电路的结构示意图；
图5为图4所示的触控驱动电路的工作原理示意图；
图6为图4所示的触控驱动电路输出的驱动信号在一个周期内的信号波形示意图；
图7为图4所示的触控驱动电路的一种电路模型示意图；
图8为本申请实施例提供的又一种触控驱动电路的结构示意图；
图9为图8所示的触控驱动电路的工作原理示意图；
图10为图8所示的触控驱动电路输出的驱动信号在一个周期内的信号波形示意图。
具体实施方式
下面将结合附图对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请的一部分实施例，而不是全部的实施例。
本申请使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
另外，“第一”、“第二”等术语仅用于区别类似的对象，而不能理解为指示或暗示相对重要性，或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”等的特征可以明示或者隐含地包括一个或者更多个该特征。
本申请实施例提供一种触控驱动电路、驱动芯片以及触控显示装置。其中，触控驱动电路可应用于电容式的触控显示装置中，对触控显示装置的驱动电极进行驱动。触控显示装置还可以包括显示器件，并且显示器件的示例包括：液晶(LCD)显示器，有机发光(OLED)显示器，等离子体(PDP)显示器以及阴极射线(CRT)显示器。
如图3所示，为本申请实施例提供的一种触控驱动电路的结构示意图；其中，电阻R tx表示驱动阻抗，包括驱动电极和触控驱动电路的等效阻抗，电容C L表示驱动电极的等效电容。触控驱动电路20包括电压产生电路201和开关电路202，并且电压产生电路201与开关电路202电连接；电压产生电路201包括至少一个储能电容(图中未示出)，该至少一个储能电容可以存储驱动电极释放的电荷，以及将存储的电荷转移给驱动电极；开关电路202可以控制电压产生电路201周期性地输出电源电压、第一正电压、第二正电压、第三正电压和零电压；其中，第一正电压、第二正电压和第三正电压为该至少一个储能电容提供的电压，并且其幅值大小满足以下关系：电源电压>第一正电压>第二正电压>第三正电压>零电压。
通过增设至少一个储能电容，可以实现对驱动电极放电时释放出的电荷进行回收利用，在该至少一个储能电容与驱动电极之间进行电荷转移的过程中，不产生额外的功耗，并且在电源电压与零电压之间引入了多个中间电平，从而等效减小了直接由电源电压对驱动电极进行充电时，驱动电极两端的电压变化量，有效降低了触控驱动电路的驱动功耗。
基于图3所示的触控驱动电路，电压产生电路可以进一步包括电源电压产生电路，第一储能电容和第二储能电容。电源电压产生电路可以产生上述电源电压。开关电路可以进一步在第一时段内控制驱动电极连接至电源电压产生电路，电源电压对驱动电极充电，使得驱动电极两端的电压等于电源电压；在第二时段内控制驱动电极连接至第一储能电容，第一储能电容可以存储驱动电极释放的电荷，使得驱动电极两端的电压等于上述第一正电压；在第三时段内控制驱动电极与第一储能电容、第二储能电容串联，并且第一储能电容与第二储能电容反向串联，第一储能电容和第二储能电容可以存储驱动电极释放的电荷，使得驱动电极两端的电压等于上述第二正电压；在第四时段内控制驱动电极连接至第二储能电容，第二储能电容可以存储驱动电极释放的电荷，使得驱动电极两端的电压等于上述第三正电压；以及在第五时段内控制驱动电极连接至地端GND，驱动电极对地端GND放电，使得驱动电极两端的电压等于零电压。
在上述过程中，驱动电极两端的电压先从电源电压下降至第一正电压，又从第一正电压下降至第二正电压，再从第二正电压下降至第三正电压，而后从第三正电压下降至零电压，即在这一过程中驱动电极始终处于放电状态。通过设置两个储能电容存储驱动电极在放电过程中释放的电荷，在电源电压与零电压之间引入了三个中间电平，从而减小了驱动电极放电时电阻R L上的损耗，进而降低了该触控驱动电路的驱动功耗。
基于上述实施例公开的内容，本实施例中，开关电路可以进一步在第六时段内控制驱动电极连接至第二储能电容，第二储能电容可以将存储的电荷转移给驱动电极，使得驱动电极两端的电压等于上述第三正电压；在第七时段内控制驱动电极与第一储能电容、第二储能电容串联，并且第一储能电容与第二储能电容反向串联，第一储能电容和第二储能电容可以将存储的电荷转移给驱动电极，使得驱动电极两端的电压等 于上述第二正电压；以及在第八时段内控制驱动电极连接至第一储能电容，第一储能电容可以将存储的电荷转移给驱动电极，使得驱动电极两端的电压等于上述第一正电压。
在上述过程中，驱动电极两端的电压先从零电压升高至第三正电压，又从第三正电压升高至第二正电压，再从第二正电压升高至第一正电压，即在这一过程中驱动电极始终处于充电状态。
将上述驱动电极的放电阶段与充电阶段结合，即可构成触控驱动电路的一个工作周期，对应触控驱动电路输出的驱动信号的一个周期。两个储能电容可以存储驱动电极在放电过程中释放的电荷，再将存储的电荷转移回驱动电极，以实现对驱动电极进行充电，在这一电荷转移过程中不会产生额外的功耗，并且在电源电压与零电压之间引入了三个中间电平，使得驱动信号在一个周期内的信号幅值依次等于电源电压、第一正电压、第二正电压、第三正电压、零电压、第三正电压、第二正电压、第一正电压，既可以减小对驱动电极充电时电阻R L上的损耗，也可以减小驱动电极放电时电阻R L上的损耗，从而有效降低触控驱动电路的驱动功耗。
基于上述实施例公开的内容，本实施例中，开关电路可以进一步包括第一开关电路、第二开关电路、第三开关电路、第四开关电路以及第五开关电路。为了使驱动信号在一个周期内的信号幅值可以依次等于电源电压、第一正电压、第二正电压、第三正电压、零电压、第三正电压、第二正电压、第一正电压，可以控制：在第一时段内，第一开关电路导通；在第二时段内，第二开关电路导通；在第三时段内，第三开关电路导通；在第四时段内，第四开关电路导通；在第五时段内，第五开关电路导通；在第六时段内，第四开关电路导通；在第七时段内，第三开关电路导通；在第八时段内，第二开关电路导通，并且在上述任意一个开关电路导通时，其他四个开关电路均断开。
具体的，可以采用控制电路对各个开关电路进行控制，使得各个开关电路可以按照上述导通顺序周期性地循环导通，进而控制驱动信号具有上述阶梯状的信号波形。控制电路可以与触控驱动电路集成在同一个芯片上，也可以独立于触控驱动电路，即控制电路可以与触控驱动电路集成在不同的芯片中，本申请实施例对此不作限定。
基于上述实施例公开的内容，本申请实施例提供了另一种触控驱动电路的结构示意图，如图4所示；其中，电阻R tx表示驱动阻抗(包括驱动电极和触控驱动电路的等效阻抗)，电容C L表示驱动电极的等效电容。具体的，开关电路中，第一开关电路进一步包括第一开关S 1；第二开关电路进一步包括第二开关S 2；第三开关电路进一步包括第三开关S 3和第四开关S 4；第四开关电路进一步包括第五开关S 5和第六开关S 6；第五开关电路进一步包括第七开关S 7。具体的，触控驱动电路30中各个元件的连接关系如下：第一开关S 1的第一端连接至电源电压产生电路，以接入电源电压V DD，第一开关S 1的第二端连接至该驱动电极；第二开关S 2的第一端连接至第一储能电容C S1的第一端，第二开关S 2的第二端连接至该驱动电极；第三开关S 3的第一端连接至第二储能电容C S2的第二端，第三开关S 3的第二端连接至该驱动电极；第四开关S 4的第一端连接至第二储能电容C S2的第一端，第四开关S 4的第二端连接至第一储能电容C S1的第一端；第五开关S 5的第一端连接至第二储能电容C S2的第二端，第五开关S 5的第二端连接至地端GND；第六开关S 6的第一端连接至第二储能电容C S2的第一端，第六开关S 6 的第二端连接至该驱动电极；第七开关S 7的第一端连接至地端GND，第七开关S 7的第二端连接至该驱动电极；第一储能电容C S1的第二端连接至地端GND。
图5为图4所示的触控驱动电路的工作原理示意图；其中，第一储能电容C S1两端的电压记为V C1，第二储能电容C S2两端的电压记为V C2。可以看到，在t 1时段内，仅第一开关电路导通，即仅第一开关S 1闭合，电源电压V DD对电容C L充电，直至电容C L两端的电压等于电源电压V DD。
在t 2时段内，仅第二开关电路导通，即仅第二开关S 2闭合，电容C L对第一储能电容C S1放电，第一储能电容C S1存储电容C L释放的电荷，直至电容C L两端的电压等于第一正电压。
在t 3时段内，仅第三开关电路导通，即第三开关S 3和第四开关S 4同时闭合，电容C L对第一储能电容C S1和第二储能电容C S2的串联电容放电，第一储能电容C S1和第二储能电容C S2存储电容C L释放的电荷，直至电容C L两端的电压等于第二正电压。
在t 4时段内，仅第四开关电路导通，即第五开关S 5和第六开关S 6同时闭合，电容C L对第二储能电容C S2放电，直至电容C L两端的电压等于第三正电压。
在t 5时段内，仅第五开关电路导通，即仅第七开关S 7闭合，电容C L对地放电，直至电容C L两端的电压等于零电压。
在t 6时段内，仅第四开关电路导通，即第五开关S 5和第六开关S 6同时闭合，第二储能电容C S2对电容C L充电，直至电容C L两端的电压等于第三正电压。
在t 7时段内，仅第三开关电路导通，即第三开关S 3和第四开关S 4同时闭合，第一储能电容C S1和第二储能电容C S2的串联电容对电容C L充电，直至电容C L两端的电压等于第二正电压。
在t 8时段内，仅第二开关电路导通，即仅第二开关S 2闭合，第一储能电容C S1对电容C L充电，直至电容C L两端的电压等于第一正电压。
本申请实施例提供的触控驱动电路可以按照上述八个时段为一个周期循环工作，第一储能电容C S1两端的电压V C1和第二储能电容C S2两端的电压V C2在这一循环的工作过程中会逐渐建立至稳定值，并且当第一储能电容C S1和第二储能电容C S2两端的电压均建立至稳定值时，第一正电压的幅值等于第一储能电容C S1两端的电压值V C1，第二正电压的幅值等于第一储能电容C S1两端的电压值V C1减去第二储能电容C S2两端的电压值V C2，即等于V C1-V C2，第三正电压的幅值等于第二储能电容C S2两端的电压值V C2。
需要说明的是，当第一储能电容C S1和第二储能电容C S2的电容值远大于电容C L的电容值时，第一储能电容C S1、第二储能电容C S2存储电容C L释放的电荷或者向电容C L转移电荷后，第一储能电容C S1和第二储能电容C S2两端的电压值几乎不发生改变。具体的，当第一储能电容C S1、第二储能电容C S2的电容值大于电容C L的电容值的50～100倍时，可以判定第一储能电容C S1、第二储能电容C S2的电容值远大于电容C L的电容值。
下面基于电荷守恒定律，分别针对上述八个时段内第一储能电容C S1、第二储能电容C S2、电容C L之间的电荷转移情况进行分析，以计算第一储能电容C S1和第二储能电容C S2两端的电压建立至稳定值时，第一正电压、第二正电压和第三正电压的具体值。 以下设置第一储能电容C S1、第二储能电容C S2、电容C L的电容值大小满足：C S1＝C S2＝C S>>C L。
在t 1时段内，电容C L两端电压的终值等于电源电压V DD。
在t 2时段内，电容C L两端电压的初值为V DD，终值记为V x1，第一储能电容C S1两端电压的初值为V C1，终值同样为V x1，根据电荷守恒定律，上述电压值和电容值满足如下关系：
C L*(V DD-V x1)＝C S1*(V x1-V C1).   (公式1)
根据公式1可以得到：
V x1＝(C S1*V C1+C L*V DD)/(C S1+C L).   (公式2)
由于第一储能电容C S1、第二储能电容C S2、电容C L的电容值大小满足：C S1＝C S2＝C S>>C L，所以根据公式2可以得到：
V x1≈(1-C L/C S)*V C1+C L/C S*V DD.   (公式3)
在t 3时段内，电容C L两端电压的初值为V x1，终值为V x2；第一储能电容C S1两端电压的初值为V x1，终值为V x3；第二储能电容C S2两端电压的初值为V C2，终值为V x3-V x2；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C S1*(V x3-V x1)＝C L*(V x1-V x2)；   (公式4)
C S2*(V x2-V x3)+C S2*V C2＝C L*(V x1-V x2).   (公式5)
根据公式4和公式5，可以得到：
V x2≈(1-C L/C S)*V C1-(1-2*C L/C S)*V C2+C L/C S*V DD；  (公式6)
V x1≈(1-C L/C S)*V C1+C L/C S*V C2+C L/C S*V DD.   (公式7)
在t 4时段内，电容C L两端电压的初值为V x3-V x2，终值为V x4；第二储能电容C S2两端电压的初值为V x2，终值同样为V x4；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C L*(V x2-V x4)＝C S2*[V x4-(V x3-V x2)].   (公式8)
根据公式8可以得到：
V x4≈(1-3*C L/C S)*V C2+C L/C S*V C1.   (公式9)
在t 5时段结束时，电容C L对地放电至两端电压等于零电压，所以在t 6时段内，电容C L两端电压的初值为0，终值为V x5，第二储能电容C S2两端电压的初值为V x4，终值同样为V x5；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C L*V x5＝C S2*(V x4-V x5).   (公式10)
根据公式10可以得到：
V x5≈C L/C S*V C1+(1-4*C L/C S)*V C2.   (公式11)
在t 7时段内，电容C L两端电压的初值为V x5，终值为V x6；第一储能电容C S1两端电压的初值为V x3，终值为V x7；第二储能电容C S2两端电压的初值为V x5，终值为V x7-V x6；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C L*(V x6-V x5)＝C S1*(V x3-V x7)＝C S2*[(V x7-V x6)-V x5].    (公式12)
根据公式12可以得到：
V x6≈(1-4*C L/C S)*V C1-(1-4*C L/C S)*V C2+C L/C S*V DD；   (公式13)
V x7≈(1-2*C L/C S)*V C1+3*C L/C S*V C2+C L/C S*V DD.   (公式14)
在t 8时段内，电容C L两端电压的初值为V x6，终值为V x8；第一储能电容C S1两端电压的初值为V x7，终值同样为V x8；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C S1*(V x7-V x8)＝C L*(V x8-V x6).   (公式15)
根据公式15可以得到：
V x8≈(1-2*C L/C S)*V C1+2*C L/C S*V C2+C L/C S*V DD.   (公式16)
当第一储能电容C S1两端的电压V C1和第二储能电容C S2两端的电压V C2达到稳定状态时，满足如下关系：
V x7-V x6＝V C2；   (公式17)
V x8＝V C1.   (公式18)
根据公式17和公式18可以计算得到：
Figure PCTCN2021079158-appb-000004
因此，第一储能电容C S1和第二储能电容C S2两端的电压建立稳定后，第一正电压、第二正电压、第三正电压分别等于3/4V DD、1/2V DD、1/4V DD。
如图6所示，为图4所示的触控驱动电路输出的驱动信号在一个周期内的信号波形示意图；该驱动信号的波形是基于第一储能电容C S1和第二储能电容C S2两端的电压已经建立至稳定值的情况。可以看到，该驱动信号的波形呈阶梯状，并且该驱动信号的一个周期可以被划分为八个时段，这八个时段分别对应着四个不同的信号幅值，分别为电源电压VDD，第一正电压3/4V DD、第二正电压1/2V DD、第三正电压1/4V DD。由于在整个周期内，仅有一个时段直接由电源电压对驱动电极充电，并且该时段内驱动电极两端的电压从3/4V DD升高至V DD，所以消耗的电源能量ΔQ为：
ΔQ＝C L*(V DD-3/4*V DD)＝1/4*C L*V DD.   (公式19)
因此，该触控驱动电路在一个周期T内的驱动功耗为：
P＝V DD*ΔQ/T＝1/4*C L*V DD 2*f.   (公式20)
本申请实施例提供的触控驱动电路通过增设两个储能电容，在电源电压与零电压之间引入了三个中间电平，相当于减小了直接由电源电压对驱动电极进行驱动时，驱动电极两端的电压变化量，所以相比于图1所示的传统触控驱动电路，在提供相同幅度的驱动信号的情况下，本申请实施例提供的触控驱动电路一个周期T内的驱动功耗明显降低，仅为传统触控驱动电路的25％。
下面从另一个角度来计算触控驱动电路的驱动功耗，如图6所示，其中的八个阴影部分表示一个周期T内驱动阻抗R L上的损耗。为了便于计算在一个周期T内驱动阻抗R L上的损耗，可以采用图7所示的电路模型示意图，该电路模型可以表示任意一个时段t i(i＝1,2…8)内触控驱动电路对驱动电极进行充电或放电的情况。
触控驱动电路对驱动电极进行充电或放电时的电流大小为：
Figure PCTCN2021079158-appb-000005
由于
Figure PCTCN2021079158-appb-000006
所以根据公式21可以得到：
Figure PCTCN2021079158-appb-000007
根据公式22可以得到在一个时段内驱动阻抗R L上消耗的能量为：
Figure PCTCN2021079158-appb-000008
因此，一个周期T内驱动阻抗R L上的损耗为1/4*C L*V DD 2*f，其中f＝1/T，表示驱动信号的频率。
由于开关电路导通后，电容C L两端的电压往往是以非理想的状态变化，即电容C L两端的电压不会在开关电路导通的瞬间变化至目标稳定值，所以为了保证本申请实施例提供的触控驱动电路的驱动功耗和输出的驱动信号的幅值能够达到预设的目标值，可以设置第一开关电路、第二开关电路、第三开关电路、第四开关电路、第五开关电路的导通时间大于或等于驱动电极两端的电压在相应时段内建立至稳定值的时间。
另一方面，互容检测应用中还可以采用正交打码方式，即在同一时刻下，一部分驱动电极采用正相位的驱动波形进行驱动，称为正相位驱动电极，而另一部分驱动电极采用负相位的驱动波形进行驱动，称为负相位驱动电极。针对这种打码方式，本申请实施例还提供一种触控驱动电路，能够同时对正相位驱动电极和负相位驱动电极进行驱动，从而更好地适应采用正交打码方式的触控检测应用。
基于图3所示的触控驱动电路，电压产生电路可以进一步包括电源电压产生电路和第三储能电容。电源电压产生电路可以产生上述电源电压。开关电路可以进一步在第一时段内同时控制正相位驱动电极连接至电源电压产生电路，负相位驱动电极连接至地端GND，电源电压对正相位驱动电极充电，负相位驱动电极对地端GND放电，使得正相位驱动电极两端的电压等于上述电源电压，负相位驱动电极两端的电压等于零电压；在第二时段内控制正相位驱动电极、第三储能电容、负相位驱动电极串联，并且正相位驱动电极与第三储能电容反向串联，正相位驱动电极通过第三储能电容对负相位驱动电极充电，使得正相位驱动电极两端的电压等于上述第一正电压，负相位驱动电极两端的电压等于上述第三正电压；在第三时段内控制正相位驱动电极、第三储能电容、负相位驱动电极并联，正相位驱动电极对第三储能电容和负相位驱动电极充电，使得正相位驱动电极两端的电压等于负相位驱动电极两端的电压，并且等于上述第二正电压；在第四时段内控制正相位驱动电极、第三储能电容、负相位驱动电极串联，并且正相位驱动电极与第三储能电容正向串联，正相位驱动电极通过第三储能电容对负相位驱动电极充电，使得正相位驱动电极两端的电压等于上述第三正电压，负相位驱动电极两端的电压等于上述第一正电压；以及在第五时段内同时控制正相位驱动电极连接至地端GND，负相位驱动电极连接至电源电压产生电路，正相位驱动电极对地端GND放电，电源电压对负相位驱动电极充电，使得正相位驱动电极两端的电压等于零电压，负相位驱动电极两端的电压等于电源电压。
在上述过程中，正相位驱动电极两端的电压先从电源电压下降至第一正电压，同时负相位驱动电极两端的电压从零电压升高至第三正电压；正相位驱动电极两端的电压又从第一正电压下降至第二正电压，同时负相位驱动电极两端的电压从第三正电压升高至第二正电压；正相位驱动电极两端的电压再从第二正电压下降至第三正电压，同时负相位驱动电极两端的电压从第二正电压升高至第一正电压；而后正相位驱动电极两端的电压从第三正电压下降至零电压，同时负相位驱动电极两端的电压从第一正 电压升高至电源电压，即在这一过程中正相位驱动电极处于放电状态，负相位驱动电极处于充电状态。通过设置一个第三储能电容，并利用开关电路切换第三储能电容、正相位驱动电极、负相位驱动电极三者之间的串并联状态，在电源电压与零电压之间引入了三个中间电平，从而减小了正相位驱动电极放电时电阻R L上的损耗，以及对负相位驱动电极充电时电阻R L上的损耗，进而降低了该触控驱动电路的驱动功耗。
基于上述实施例公开的内容，本实施例中，开关电路可以进一步在第六时段内控制正相位驱动电极、第三储能电容、负相位驱动电极串联，并且正相位驱动电极与第三储能电容正向串联，负相位驱动电极通过第三储能电容对正相位驱动电极充电，使得负相位驱动电极两端的电压等于第四正电压，正相位驱动电极两端的电压等于第五正电压；在第七时段内控制正相位驱动电极、第三储能电容、负相位驱动电极并联，负相位驱动电极对第三储能电容和正相位驱动电极充电，使得正相位驱动电极两端的电压等于负相位驱动电极两端的电压，等于上述第二正电压；以及在第八时段内控制正相位驱动电极、第三储能电容、负相位驱动电极串联，并且正相位驱动电极与第三储能电容反向串联，负相位驱动电极通过第三储能电容对正相位驱动电极充电，使得正相位驱动电极两端的电压等于上述第四正电压，负相位驱动电极两端的电压等于上述第五正电压。其中，第四正电压和第五正电压的幅值大小满足：电源电压>第四正电压>第五正电压>零电压。
在上述过程中，正相位驱动电极两端的电压先从零电压升高至第五正电压，同时负相位驱动电极两端的电压从电源电压下降至第四正电压；正相位驱动电极两端的电压又从第五正电压升高至第二正电压，同时负相位驱动电极两端的电压从第四正电压下降至第二正电压；而后正相位驱动电极两端的电压从第二正电压升高至第四正电压，同时负相位驱动电极两端的电压从第二正电压下降至第五正电压，即在这一过程中，正相位驱动电极处于充电状态，负相位驱动电极处于放电状态。将这一过程与上一过程结合，即可构成触控驱动电路的一个工作周期，对应触控驱动电路输出的驱动信号的一个周期。第三储能电容可以回收利用正相位驱动电极和负相位驱动电极在放电过程中释放的电荷，以实现对正相位驱动电极和负相位驱动电极进行充电，在这一电荷转移过程中不会产生额外的功耗，并且开关电路通过切换第三储能电容、正相位驱动电极、负相位驱动电极三者之间的串并联状态，在电源电压与零电压之间引入了五个中间电平，使得驱动信号具有阶梯状的信号波形，同时可以很好地适应正交打码的驱动方式。
基于上述实施例公开的内容，本实施例中，开关电路可以进一步包括：第六开关电路、第七开关电路、第八开关电路、第九开关电路以及第十开关电路。为了使驱动信号具有上述阶梯状的信号波形，可以控制：在上述第一时段内，第六开关电路导通；在上述第二时段内，第七开关电路导通；在上述第三时段内，第八开关电路导通；在上述第四时段内，第九开关电路导通；在上述第五时段内，第十开关电路导通；在上述第六时段内，第九开关电路导通；在上述第七时段内，第八开关电路导通；在上述第八时段内，第七开关电路导通；上述任意一个开关电路导通时，其他四个开关电路均断开。
具体的，可以采用控制电路对开关电路进行控制，使得开关电路可以按照上述导 通顺序周期性地循环导通，进而控制触控驱动电路输出的驱动信号具有上述阶梯状的信号波形。控制电路可以与触控驱动电路集成在同一个芯片上，也可以独立于触控驱动电路，即控制电路可以与触控驱动电路集成在不同的芯片中，本申请实施例对此不作限定。
基于上述实施例公开的内容，本申请实施例提供了又一种触控驱动电路的结构示意图，如图8所示，以适应采用正交打码方式的触控检测场景；其中，电阻R tx,p和电阻R tx,n分别表示正相位驱动阻抗和负相位驱动阻抗，电容C L,p和电容C L,n分别表示正相位驱动电极和负相位驱动电极的等效电容。开关电路中，第六开关电路进一步包括第八开关S 8和第九开关S 9；第七开关电路进一步包括第十开关S 10和第十一开关S 11；第八开关电路进一步包括第十二开关S 12、第十三开关S 13以及第十四开关S 14；第九开关电路进一步包括第十五开关S 15和第十六开关S 16；第十开关电路进一步包括第十七开关S 17和第十八开关S 18。具体的，触控驱动电路40中各个元件的连接关系如下：第八开关S 8的第一端连接至电源电压产生电路，接入电源电压V DD，第八开关S 8的第二端连接至该正相位驱动电极；第九开关S 9的第一端连接至地端GND，第九开关S 9的第二端连接至该负相位驱动电极；第十开关S 10的第一端连接至第三储能电容C S3的第一端，第十开关S 10的第二端连接至该正相位驱动电极；第十一开关S 11的第一端连接至第三储能电容C S3的第二端，第十一开关S 11的第二端连接至该负相位驱动电极；第十二开关S 12的第一端连接至第十二开关S 12的第一端连接至第十二开关S 12的第二端连接至该正相位驱动电极；第十三开关S 13的第一端连接至第三储能电容C S3的第一端，第十三开关S 13的第二端连接至该负相位驱动电极；第十四开关S 14的第一端连接至第三储能电容C S3的第二端，第十四开关S 14的第二端连接至地端GND；第十五开关S 15的第一端连接至第三储能电容C S3的第二端，第十五开关S 15的第二端该正相位驱动电极；第十六开关S 16的第一端连接至第三储能电容C S3的第一端，第十六开关S 16的第二端连接至该负相位驱动电极；第十七开关S 17的第一端连接至地端GND，第十七开关S 17的第二端连接至该正相位驱动电极；第十八开关S 18的第一端连接至电源电压产生电路，第十八开关S 18的第二端连接至该负相位驱动电极。
图9为图8所示的触控驱动电路的工作原理示意图；为便于清楚地表示该触控驱动电路在工作过程中第三储能电容C S3、正相位驱动电极、负相位驱动电极之间的电荷转移情况，图中省略了电阻R tx,p和电阻R tx,n，第三储能电容C S3两端的电压记为V C3，电容C L,p两端的电压记为V p，电容C L,n两端的电压记为V n，并且电容C L,p和电容C L,n之间的电容值满足：C L,p/C L,n＝k(k>0)。
在t 1时段内，仅第六开关电路导通，即仅第八开关S 8和第九开关S 9同时闭合，电源电压V DD对电容C L,p进行充电，直至电容C L,p两端的电压V p等于电源电压V DD，电容C L,n对地放电，直至电容C L,n两端的电压V n等于0。
在t 2时段内，仅第七开关电路导通，即仅第十开关S 10和第十一开关S 11同时闭合，电容C L,p通过第三储能电容C S3对电容C L,n进行充电，直至电容C L,p两端的电压V p等于第一正电压，电容C L,n两端的电压V n等于第三正电压；电容C L,n两端电压的变化量ΔV n与电容C L,p两端电压的变化量ΔV p之比等于k(ΔV n/ΔV p＝k)。
在t 3时段内，仅第八开关电路导通，即仅第十二开关S 12、第十三开关S 13和第十 四开关S 14同时闭合，电容C L,p与第三储能电容C S3、电容C L,n并联，电容C L,p对第三储能电容C S3和电容C L,n进行充电，直至电容C L,p和电容C L,n两端的电压相等，并且等于第二正电压。
在t 4时段内，仅第九开关电路导通，即仅第十五开关S 15和第十六开关S 16同时闭合，电容C L,p通过第三储能电容C S3对电容C L,n进行充电，直至电容C L,n两端的电压V n等于第一正电压，电容C L,p两端的电压V p等于第三正电压；电容C L,n两端电压的变化量ΔV n与电容C L,p两端电压的变化量ΔV p之比等于k(ΔV n/ΔV p＝k)。
在t 5时段内，仅第十开关电路导通，即仅第十七开关S 17和第十八开关S 18同时闭合，电源电压V DD对电容C L,n进行充电，直至电容C L,n两端的电压V n等于电源电压V DD，电容C L,p对地放电，直至电容C L,p两端的电压V p等于0。
在t 6时段内，仅第九开关电路导通，即仅第十五开关S 15和第十六开关S 16同时闭合，电容C L,n通过第三储能电容C S3对电容C L,p进行充电，直至电容C L,n两端的电压V n等于第四正电压，电容C L,p两端的电压V p等于第五正电压；电容C L,n两端电压的变化量ΔV n与电容C L,p两端电压的变化量ΔV p之比等于k(ΔV n/ΔV p＝k)。
在t 7时段内，仅第八开关电路导通，即仅第十二开关S 12、第十三开关S 13和第十四开关S 14同时闭合，电容C L,n与第三储能电容C S3、电容C L,p并联，电容C L,n对第三储能电容C S3和电容C L,p进行充电，直至电容C L,p和电容C L,n两端的电压相等，并且等于第二正电压。
在t 8时段内，仅第七开关电路导通，即仅第十开关S 10和第十一开关S 11同时闭合，电容C L,n通过第三储能电容C S3对电容C L,p进行充电，直至电容C L,p两端的电压V p等于第四正电压，电容C L,n两端的电压V n等于第五正电压；电容C L,n两端电压的变化量ΔV n与电容C L,p两端电压的变化量ΔV p之比等于k(ΔV n/ΔV p＝k)。
因此，本申请实施例提供的触控驱动电路可以按照上述八个时段为一个周期循环工作。第三储能电容C S3两端的电压V C3在这一循环的工作过程中会逐渐建立至稳定值，并且当第三储能电容C S3两端的电压建立至稳定值时，第一正电压的幅值减去第三正电压的幅值等于第三储能电容C S3两端的电压值V C3；第二正电压的幅值等于第三储能电容C S3两端的电压值V C3；第四正电压的幅值减去第五正电压的幅值等于第三储能电容C S3两端的电压值V C3。
另外，根据电荷守恒定律可以得到，当第三储能电容C S3的电容值远大于电容C L,p和电容C L,n的电容值时，当第三储能电容C S3两端的电压建立稳定时，第二电压值近似等于V DD/2。具体的，当第三储能电容C S3的电容值大于电容C L,p和电容C L,n的电容值的50～100倍时，可以判定第三储能电容C S3的电容值远大于电容C L,p和电容C L,n的电容值。
因此，在上述t 4时段内，电容C L,p两端电压的初值为V DD/2，终值记为V y1，电容C L,n两端电压的初值为V DD/2，终值记为V y2；根据电荷守恒定律，上述电压值和电容值满足如下关系：
C L,p*(V DD/2-V y1)＝C L,n*(V y2-V DD/2)；   (公式24)
V y2-V y1＝V DD/2；   (公式25)
C L,p/C L,n＝k,C L,p+C L,n＝C L.   (公式26)
根据公式24至公式26可以得到：
Figure PCTCN2021079158-appb-000009
Figure PCTCN2021079158-appb-000010
在一个周期T内，相当于仅t 1时段和t 5直接由电源提供电荷，其中t 1时段内电容C L,p从电源获取的电荷量ΔQ 1为：
Figure PCTCN2021079158-appb-000011
同理，t 5时段内电容C L,n从电源获取的电荷量ΔQ 2为：
Figure PCTCN2021079158-appb-000012
根据公式29和公式30可以得到，一个周期T内从电源获取的平均电流为：
Figure PCTCN2021079158-appb-000013
因此，在一个周期T内触控驱动电路的驱动功耗为：
Figure PCTCN2021079158-appb-000014
其中，f为驱动信号的频率，并且f＝1/T。
根据公式32可以得到，触控驱动电路的驱动功耗随着k值的增大而增大，最大值为1/2*C L*V DD 2*f；具体的，当k＝1时，触控驱动电路的驱动功耗为1/4*C L*V DD 2*f。
本申请实施例提供的触控驱动电路可以仅增设一颗外挂电容(第三储能电容)，实现有效降低触控驱动电路的驱动功耗，从而节约触控检测PCB的面积和成本，并且可以很好地适应采用正交打码方式并且正码负码通道数对称的触控检测应用场景。
当第三储能电容C S3两端的电压建立稳定时，理想状态下正相位驱动电极和负相位驱动电极对应的驱动信号的波形示意图如图10所示，图中忽略了驱动阻抗的影响；其中，电容C L,p和电容C L,n之间的电容值满足：C L,p/C L,n＝k，0<k<1。可以看到，正相位驱动电极和负相位驱动电极上的驱动电压呈相反趋势同步变化，驱动信号的波形均呈阶梯状；图中各个驱动电压的大小关系满足：电源电压>第四正电压>第一正电压>第二正电压>第五正电压>第三正电压>零电压，其中第一正电压与第三正电压之间的差值等于第四正电压与第五正电压之间的差值，并且等于第二正电压。
另外，当k＝1，C S3>>C L，并且第三储能电容C S3两端的电压建立稳定时，各个驱动电压的大小关系满足：第一正电压和第四正电压近似等于3/4V DD，第三正电压和第五正电压近似等于1/4V DD，并且第一正电压或第四正电压与第二正电压之间的差值等于第二正电压与第三正电压或第五正电压之间的差值；当k>1，并且第三储能电容C S3两端的电压建立稳定时，各个驱动电压的大小关系满足：电源电压>第一正电压>第四正电压>第二正电压>第三正电压>第五正电压>零电压，其中第一正电压与第三正电压之间的差值等于第四正电压与第五正电压之间的差值，并且等于第二正电压。
需要说明的是，图10所示为理想的打码信号波形示意图，然而在开关电路导通后，电容C L,p和电容C L,n两端的电压往往是以非理想的状态变化，即电容C L,p和电容C L,n两端的电压不会在开关电路导通的瞬间变化至目标稳定值，所以为了保证本申请实施例提供的触控驱动电路的驱动功耗以及输出的驱动信号的幅值能够达到预设的目标值， 可以设置第六开关电路、第七开关电路、第八开关电路、第九开关电路、第十开关电路的导通时间大于或等于正相位驱动电极、负相位驱动电极两端的电压在相应时段内建立至稳定值的时间。
本申请实施例提供一种触控驱动芯片，该触控驱动芯片包括上述实施例提供的触控驱动电路，需要说明的是，该触控驱动芯片还可以包括其他电路，例如控制电路，可用于控制开关电路按照预设方式周期性地导通。
本申请实施例提供一种触控显示装置，该触控显示装置包括上述实施例提供的触控驱动芯片。
该触控显示装置可以包括显示器件，例如液晶显示器、有机发光显示器、等离子体显示器和阴极射线显示器等显示器件。
应理解，本申请实施例中的具体实施方式仅是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形均落入本申请的保护范围。

Claims (16)

  1. 一种触控驱动电路，用于输出驱动信号对触控显示装置的驱动电极进行驱动，其特征在于，包括：电压产生电路和开关电路；所述电压产生电路与所述开关电路电连接；
    所述电压产生电路包括至少一个储能电容；所述至少一个储能电容用于存储所述驱动电极释放的电荷，以及将存储的电荷转移给所述驱动电极；
    所述开关电路用于控制所述电压产生电路周期性地输出电源电压、第一正电压、第二正电压、第三正电压和零电压；
    所述第一正电压、所述第二正电压和所述第三正电压为所述至少一个储能电容提供的电压，并且所述电源电压高于所述第一正电压，所述第一正电压高于所述第二正电压，所述第二正电压高于所述第三正电压，所述第三正电压高于所述零电压。
  2. 根据权利要求1所述的触控驱动电路，其特征在于，所述电压产生电路进一步包括电源电压产生电路，第一储能电容以及第二储能电容；
    所述电源电压产生电路用于产生所述电源电压；
    所述开关电路进一步用于在第一时段内控制所述驱动电极连接至所述电源电压产生电路，所述电源电压对所述驱动电极充电，使得所述驱动电极两端的电压等于所述电源电压；在第二时段内控制所述驱动电极连接至所述第一储能电容，所述第一储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第一正电压；在第三时段内控制所述驱动电极与所述第一储能电容、所述第二储能电容串联，并且所述第一储能电容与所述第二储能电容反向串联，所述第一储能电容和所述第二储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第二正电压；在第四时段内控制所述驱动电极连接至所述第二储能电容，所述第二储能电容用于存储所述驱动电极释放的电荷，使得所述驱动电极两端的电压等于所述第三正电压；以及在第五时段内控制所述驱动电极连接至地端GND，所述驱动电极对所述地端GND放电，使得所述驱动电极两端的电压等于所述零电压。
  3. 根据权利要求2所述的触控驱动电路，其特征在于，所述开关电路进一步用于在第六时段内控制所述驱动电极连接至所述第二储能电容，所述第二储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第三正电压；在第七时段内控制所述驱动电极与所述第一储能电容、所述第二储能电容串联，并且所述第一储能电容与所述第二储能电容反向串联，所述第一储能电容和所述第二储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第二正电压；以及在第八时段内控制所述驱动电极连接至所述第一储能电容，所述第一储能电容用于将存储的电荷转移给所述驱动电极，使得所述驱动电极两端的电压等于所述第一正电压。
  4. 根据权利要求3所述的触控驱动电路，其特征在于，所述开关电路进一 步包括第一开关电路、第二开关电路、第三开关电路、第四开关电路以及第五开关电路；
    在所述第一时段内，所述第一开关电路导通；在所述第二时段内，所述第二开关电路导通；在所述第三时段内，所述第三开关电路导通；在所述第四时段内，所述第四开关电路导通；在所述第五时段内，所述第五开关电路导通；在所述第六时段内，所述第四开关电路导通；在所述第七时段内，所述第三开关电路导通；在所述第八时段内，所述第二开关电路导通；
    所述任意一个开关电路导通时，所述其他四个开关电路均断开。
  5. 根据权利要求4所述的触控驱动电路，其特征在于，所述第一开关电路进一步包括第一开关S 1；所述第二开关电路进一步包括第二开关S 2；所述第三开关电路进一步包括第三开关S 3和第四开关S 4；所述第四开关电路进一步包括第五开关S 5和第六开关S 6；所述第五开关电路进一步包括第七开关S 7；
    所述第一开关S 1的第一端连接至所述电源电压产生电路，所述第一开关S 1的第二端连接至所述驱动电极；
    所述第二开关S 2的第一端连接至所述第一储能电容的第一端，所述第二开关S 2的第二端连接至所述驱动电极；
    所述第三开关S 3的第一端连接至所述第二储能电容的第二端，所述第三开关S 3的第二端连接至所述驱动电极；
    所述第四开关S 4的第一端连接至所述第二储能电容的第一端，所述第四开关S 4的第二端连接至所述第一储能电容的第一端；
    所述第五开关S 5的第一端连接至所述第二储能电容的第二端，所述第五开关S 5的第二端连接至地端GND；
    所述第六开关S 6的第一端连接至所述第二储能电容的第一端，所述第六开关S 6的第二端连接至所述驱动电极；
    所述第七开关S 7的第一端连接至所述地端GND，所述第七开关S 7的第二端连接至所述驱动电极；
    所述第一储能电容的第二端连接至所述地端GND。
  6. 根据权利要求5所述的触控驱动电路，其特征在于，在所述第一时段内，仅所述第一开关S 1闭合；在所述第二时段内，仅所述第二开关S 2闭合；在所述第三时段内，仅所述第三开关S 3和所述第四开关S 4闭合；在所述第四时段内，仅所述第五开关S 5和所述第六开关S 6闭合；在所述第五时段内，仅所述第七开关S 7闭合；在所述第六时段内，仅所述第五开关S 5和所述第六开关S 6闭合；在所述第七时段内，仅所述第三开关S 3和所述第四开关S 4闭合；在所述第八时段内，仅所述第二开关S 2闭合。
  7. 根据权利要求3至6任一项所述的触控驱动电路，其特征在于，当所述第一储能电容和所述第二储能电容两端的电压均建立至稳定值时，所述第一正电压的幅值等于所述第一储能电容两端的电压值；
    所述第二正电压的幅值等于所述第一储能电容两端的电压值减去所述第二 储能电容两端的电压值；
    所述第三正电压的幅值等于所述第二储能电容两端的电压值。
  8. 根据权利要求1所述的触控驱动电路，其特征在于，所述驱动电极进一步包括正相位驱动电极和负相位驱动电极；所述电压产生电路进一步包括电源电压产生电路和第三储能电容；
    所述电源电压产生电路用于产生所述电源电压；
    所述开关电路进一步用于在第一时段内同时控制所述正相位驱动电极连接至所述电源电压产生电路，所述负相位驱动电极连接至地端GND，所述电源电压对所述正相位驱动电极充电，所述负相位驱动电极对所述地端GND放电，使得所述正驱动电极两端的电压等于所述电源电压，所述负相位驱动电极两端的电压等于所述零电压；在第二时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容反向串联，所述正相位驱动电极通过所述第三储能电容对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第一正电压，所述负相位驱动电极两端的电压等于所述第三正电压；在第三时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极并联，所述正相位驱动电极对所述第三储能电容和所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述负相位驱动电极两端的电压，并且等于所述第二正电压；在第四时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容正向串联，所述正相位驱动电极通过所述第三储能电容对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第三正电压，所述负相位驱动电极两端的电压等于所述第一正电压；以及在第五时段内同时控制所述正相位驱动电极连接至所述地端GND，所述负相位驱动电极连接至所述电源电压产生电路，所述正相位驱动电极对所述地端GND放电，所述电源电压对所述负相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述零电压，所述负相位驱动电极两端的电压等于所述电源电压。
  9. 根据权利要求8所述的触控驱动电路，其特征在于，所述开关电路进一步用于在第六时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容正向串联，所述负相位驱动电极通过所述第三储能电容对所述正相位驱动电极充电，使得所述负相位驱动电极两端的电压等于第四正电压，所述正相位驱动电极两端的电压等于第五正电压；在第七时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极并联，所述负相位驱动电极对所述第三储能电容和所述正相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述负相位驱动电极两端的电压，并且等于所述第二正电压；以及在第八时段内控制所述正相位驱动电极、所述第三储能电容、所述负相位驱动电极串联，并且所述正相位驱动电极与所述第三储能电容反向串联，所述负相位驱动电极通过所述第 三储能电容对所述正相位驱动电极充电，使得所述正相位驱动电极两端的电压等于所述第四正电压，所述负相位驱动电极两端的电压等于所述第五正电压；
    所述第四正电压高于所述第五正电压，并且低于所述电源电压。
  10. 根据权利要求9所述的触控驱动电路，其特征在于，所述开关电路进一步包括第六开关电路、第七开关电路、第八开关电路、第九开关电路以及第十开关电路；
    在所述第一时段内，所述第六开关电路导通；在所述第二时段内，所述第七开关电路导通；在所述第三时段内，所述第八开关电路导通；在所述第四时段内，所述第九开关电路导通；在所述第五时段内，所述第十开关电路导通；在所述第六时段内，所述第九开关电路导通；在所述第七时段内，所述第八开关电路导通；在所述第八时段内，所述第七开关电路导通。
    所述任意一个开关电路导通时，所述其他四个开关电路均断开。
  11. 根据权利要求10所述的触控驱动电路，其特征在于，所述第六开关电路进一步包括第八开关S 8和第九开关S 9；所述第七开关电路进一步包括第十开关S 10和第十一开关S 11；所述第八开关电路进一步包括第十二开关S 12、第十三开关S 13以及第十四开关S 14；所述第九开关电路进一步包括第十五开关S 15和第十六开关S 16；所述第十开关电路进一步包括第十七开关S 17和第十八开关S 18；
    所述第八开关S 8的第一端连接至所述电源电压产生电路，所述第八开关S 8的第二端连接至所述正相位驱动电极；
    所述第九开关S 9的第一端连接至所述地端GND，所述第九开关S 9的第二端连接至所述负相位驱动电极；
    所述第十开关S 10的第一端连接至所述第三储能电容的第一端，所述第十开关S 10的第二端连接至所述正相位驱动电极；
    所述第十一开关S 11的第一端连接至所述第三储能电容的第二端，所述第十一开关S 11的第二端连接至所述负相位驱动电极；
    所述第十二开关S 12的第一端连接至所述第三储能电容的第一端，所述第十二开关S 12的第二端连接至所述正相位驱动电极；
    所述第十三开关S 13的第一端连接至所述第三储能电容的第一端，所述第十三开关S 13的第二端连接至所述负相位驱动电极；
    所述第十四开关S 14的第一端连接至所述第三储能电容的第二端，所述第十四开关S 14的第二端连接至所述地端GND；
    所述第十五开关S 15的第一端连接至所述第三储能电容的第二端，所述第十五开关S 15的第二端连接至所述正相位驱动电极；
    所述第十六开关S 16的第一端连接至所述第三储能电容的第一端，所述第十六开关S 16的第二端连接至所述负相位驱动电极；
    所述第十七开关S 17的第一端连接至所述地端GND，所述第十七开关S 17的第二端连接至所述正相位驱动电极；
    所述第十八开关S 18的第一端连接至所述电源电压产生电路，所述第十八 开关S 18的第二端连接至所述负相位驱动电极。
  12. 根据权利要求11所述的触控驱动电路，其特征在于，在所述第一时段内，仅所述第八开关S 8和所述第九开关S 9同时闭合；在所述第二时段内，仅所述第十开关S 10和所述第十一开关S 11闭合；在所述第三时段内，仅所述第十二开关S 12、所述第十三开关S 13和所述第十四开关S 14闭合；在所述第四时段内，仅所述第十五开关S 15和所述第十六开关S 16闭合；在所述第五时段内，仅所述第十七开关S 17和所述第十八开关S 18闭合；在所述第六时段内，仅所述第十五开关S 15和所述第十六开关S 16闭合；在所述第七时段内，仅所述第十二开关S 12、所述第十三开关S 13和所述第十四开关S 14闭合；在所述第八时段内，仅所述第十开关S 10和所述第十一开关S 11闭合。
  13. 根据权利要求9至12任一项所述的触控驱动电路，其特征在于，当所述第三储能电容两端的电压建立至稳定值时，所述第一正电压的幅值减去所述第三正电压的幅值等于所述第三储能电容两端的电压值；
    所述第二正电压的幅值等于所述第三储能电容两端的电压值；
    所述第四正电压的幅值减去所述第五正电压的幅值等于所述第三储能电容两端的电压值。
  14. 根据权利要求13所述的触控驱动电路，其特征在于，当所述正相位驱动电极的等效电容值等于所述负相位驱动电极的等效电容值时，所述第四正电压等于所述第一正电压，所述第五正电压等于所述第三正电压。
  15. 一种触控驱动芯片，其特征在于，包括如权利要求1至14任一项所述的触控驱动电路。
  16. 一种触控显示装置，其特征在于，包括如权利要求15所述的触控驱动芯片。
PCT/CN2021/079158 2021-03-04 2021-03-04 触控驱动电路、驱动芯片以及触控显示装置 Ceased WO2022183451A1 (zh)

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