CN112860116B - Touch control driving circuit, driving chip and touch control display device - Google Patents

Touch control driving circuit, driving chip and touch control display device Download PDF

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CN112860116B
CN112860116B CN202110242099.6A CN202110242099A CN112860116B CN 112860116 B CN112860116 B CN 112860116B CN 202110242099 A CN202110242099 A CN 202110242099A CN 112860116 B CN112860116 B CN 112860116B
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switch
voltage
energy storage
driving electrode
storage capacitor
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CN112860116A (en
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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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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

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  • General Engineering & Computer Science (AREA)
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Abstract

The application provides a touch driving circuit, a driving chip and a touch display device. The touch control driving circuit is used for outputting a driving signal to drive a driving electrode of the touch control display device, and comprises: a voltage generating circuit and a switching circuit; the voltage generating circuit is electrically connected with the switching circuit; the voltage generation circuit comprises at least one energy storage capacitor; at least one energy storage capacitor is used for storing the charges released by the driving electrode and transferring the stored charges to the driving electrode; the switch circuit is used for controlling the voltage generating circuit to periodically output power supply voltage, a first positive voltage, a second positive voltage, a third positive voltage and zero voltage; the first positive voltage, the second positive voltage and the third positive voltage are voltages provided by at least one energy storage capacitor. The touch control driving circuit has lower power consumption.

Description

Touch control driving circuit, driving chip and touch control display device
Technical Field
The embodiment of the application relates to the technical field of electronic circuits, in particular to a touch driving circuit, a driving chip and a touch display device.
Background
The capacitive touch display device comprises a touch electrode array formed by driving electrodes TX and sensing electrodes RX which are staggered transversely and longitudinally. By driving the driving electrode TX and receiving the signal sensed by the sensing electrode RX, the capacitance variation of the coupling capacitance between the driving electrode TX and the sensing electrode RX can be detected, and the operation of the user can be determined.
Fig. 1 is a schematic structural diagram of a conventional touch driving circuit. The touch driving circuit provides a driving signal by using an inverter composed of a PMOS transistor 101 and an NMOS transistor 102 to drive a driving electrode TX. Wherein, the voltage V DD Is a power supply voltage, a capacitor C L Representing the equivalent capacitance, resistance R, of the drive electrode TX L Representing the equivalent impedance (i.e., drive impedance) at the time of coding. In a period T of the driving signal outputted by the touch driving circuit (hereinafter referred to as a period T), the capacitor C L The average current value obtained from the power supply is:
Figure GDA0003769881910000011
when the frequency of the driving signal is f (f = 1/T), the driving power consumption of the touch driving circuit in one period T is:
Figure GDA0003769881910000012
fig. 2 is a schematic diagram of a signal waveform of the driving signal output by the touch driving circuit shown in fig. 1 in a period T. Wherein the shaded portion represents the resistance R in one period T L The driving power consumption of the touch driving circuit. The driving power consumption is mainly divided into two parts, wherein one part is a resistor R when the driving electrode TX is charged L Another part is the resistance R of the driving electrode TX during discharging L All above losses are
Figure GDA0003769881910000013
At present, as compared with a conventional LCD (Liquid Crystal Display) technology, an OLED (Organic Light Emitting Display) technology has many obvious advantages in Display performance, for example, an OLED screen is lighter and thinner, and has the characteristics of wide viewing angle, low temperature resistance, ecological environment protection, and the like, the OLED screen is widely applied. However, the load capacitance of an OLED screen (equivalent capacitance C) is compared to an LCD screen L ) The capacitance value is obviously larger, so that the power consumption of the OLED screen is increased, and the requirement of low-power-consumption touch detection is difficult to meet.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a touch driving circuit, a driving chip and a touch display device to reduce driving power consumption of the touch driving circuit.
In a first aspect, an embodiment of the present application provides a touch driving circuit for outputting a driving signal to drive a driving electrode of a touch display device, including: a voltage generating circuit and a switching circuit; the voltage generating circuit is electrically connected with the switching circuit;
the voltage generation circuit comprises at least one energy storage capacitor; the at least one energy storage capacitor is used for storing the charges released by the driving electrode and transferring the stored charges to the driving electrode;
the switch circuit is used for controlling the voltage generating circuit to periodically output a power supply voltage, a first positive voltage, a second positive voltage, a third positive voltage and a zero voltage;
the first positive voltage, the second positive voltage, and the third positive voltage are voltages provided by the at least one energy storage capacitor, and the supply voltage is higher than the first positive voltage, the first positive voltage is higher than the second positive voltage, the second positive voltage is higher than the third positive voltage, and the third positive voltage is higher than the zero voltage.
Through addding at least one energy storage capacitor, and utilize this at least one energy storage capacitor storage drive electrode to release when discharging, and shift back the drive electrode with the electric charge of storage and in order to realize charging the drive electrode, be equivalent to utilize this at least one energy storage capacitor to carry out recycle to the electric charge that the drive electrode released, so can not cause extra consumption in this electric charge shift process, and introduced a plurality of intermediate level between mains voltage and zero voltage, including first positive voltage, second positive voltage and third positive voltage, thereby when the equivalent has reduced directly to be driven the drive electrode by mains voltage, the voltage variation at drive electrode both ends, and then reduced this touch drive circuit's actual consumption.
Optionally, the voltage generation circuit further comprises a power supply voltage generation 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 switching circuit is further used for controlling the driving electrode to be connected to the power supply voltage generating circuit in a first period, and the power supply voltage charges the driving electrode so that the voltage across the driving electrode is equal to the power supply voltage; controlling the driving electrode to be connected to the first energy storage capacitor in a second time period, wherein the first energy storage capacitor is used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the first positive voltage; controlling the driving electrode to be connected in series with the first energy storage capacitor and the second energy storage capacitor in series and in reverse, and the first energy storage capacitor and the second energy storage capacitor are used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the second positive voltage; controlling the driving electrode to be connected to the second energy storage capacitor in a fourth period, wherein the second energy storage capacitor is used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the third positive voltage; and controlling the driving electrode to be connected to a ground terminal GND in a fifth period, wherein the driving electrode discharges to the ground terminal GND, so that the voltage across the driving electrode is equal to the zero voltage.
Optionally, the switch circuit is further configured to control the driving electrode to be connected to the second energy storage capacitor during a sixth time period, the second energy storage capacitor being configured to transfer stored charge to the driving electrode, such that the voltage across the driving electrode equals the third positive voltage; controlling the driving electrode to be connected with the first energy storage capacitor and the second energy storage capacitor in series and the first energy storage capacitor to be connected with the second energy storage capacitor in series in an opposite direction in a seventh time period, wherein the first energy storage capacitor and the second energy storage capacitor are used for transferring stored charges to the driving electrode, so that the voltage across the driving electrode is equal to the second positive voltage; and controlling the driving electrode to be connected to the first energy storage capacitor during an eighth period, the first energy storage capacitor being configured to transfer stored charge to the driving electrode such that the voltage across the driving electrode is equal to the first positive voltage.
Optionally, the switch circuit further comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, and a fifth switch circuit;
in the first period, the first switch circuit is conducted; in the second period, the second switch circuit is conducted; during the third period, the third switch circuit is turned on; during the fourth period, the fourth switching circuit is turned on; in the fifth period, the fifth switch circuit is turned on; in the sixth period, the fourth switch circuit is turned on; in the seventh period, the third switch circuit is turned on; in the eighth time period, the second switch circuit is turned on;
and when any one of the switch circuits is switched on, the other four switch circuits are switched off.
Optionally, the first switch circuit further comprises a first switch S 1 (ii) a The second switch circuit further comprises a second switch S 2 (ii) a The third switch circuit further comprises a third switch S 3 And a fourth switch S 4 (ii) a The fourth switching circuit further comprises a fifth switch S 5 And a sixth switch S 6 (ii) a The fifth switching circuit further comprises a seventh switch S 7 ；
The first switch S 1 Is connected to the supply voltage generating circuit, the first switch S 1 Is connected to the drive electrode;
the second switch S 2 Is connected to a first end of the first energy storage capacitor, the second switch S 2 Is connected to the drive electrode;
the third switch S 3 Is connected to the second end of the second energy storage capacitor, the third switch S 3 Is connected to the drive electrode;
the fourth switch S 4 Is connected to the first terminal of the second energy storage capacitor, the fourth switch S 4 Is connected to a first end of the first energy storage capacitor;
the fifth switch S 5 Is connected to the second end of the second energy storage capacitor, the fifth switch S 5 The second end of the first switch is connected to the ground end GND;
the sixth switch S 6 Is connected to the first end of the second energy storing capacitor, the sixth switch S 6 Is connected to the drive electrode;
the seventh switch S 7 Is connected to the ground terminal GND, the seventh switch S 7 Is connected to the drive electrode;
the second end of the first energy storage capacitor is connected to the ground end GND.
Optionally, during the first period, only the first switch S 1 Closing; during the second periodInner, only the second switch S 2 Closing; in the third period, only the third switch S 3 And said fourth switch S 4 Closing; during the fourth period, only the fifth switch S 5 And the sixth switch S 6 Closing; during the fifth period, only the seventh switch S 7 Closing; during the sixth period, only the fifth switch S 5 And said sixth switch S 6 Closing; during the seventh period, only the third switch S 3 And said fourth switch S 4 Closing; during the eighth period, only the second switch S 2 And (5) closing.
Optionally, when the voltages across the first energy storage capacitor and the second energy storage capacitor are both established to a stable value, the magnitude of the first positive voltage is equal to the voltage value across the first energy storage capacitor;
the amplitude of the second positive voltage is equal to the voltage value at two ends of the first energy storage capacitor minus the voltage value at two ends of the second energy storage capacitor;
the amplitude of the third positive voltage is equal to the voltage value at two ends of the second energy storage capacitor.
Optionally, the driving electrodes further comprise positive phase driving electrodes and negative phase driving electrodes; the voltage generation circuit further comprises a power supply voltage generation circuit and a third energy storage capacitor;
the power supply voltage generating circuit is used for generating the power supply voltage;
the switching circuit is further configured to simultaneously control the positive phase driving electrode to be connected to the power supply voltage generating circuit, the negative phase driving electrode to be connected to a ground terminal GND, the power supply voltage charging the positive phase driving electrode, the negative phase driving electrode discharging the ground terminal GND so that a voltage across the positive driving electrode is equal to the power supply voltage, and a voltage across the negative phase driving electrode is equal to the zero voltage during a first period; controlling the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in series and to be connected in series in reverse with the third energy storage capacitor during a second period, the positive phase driving electrode charging the negative phase driving electrode through the third energy storage capacitor such 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 third positive voltage; controlling the positive phase drive electrode, the third energy storage capacitor, and the negative phase drive electrode in parallel for a third period of time, the positive phase drive electrode charging the third energy storage capacitor and the negative phase drive electrode such 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; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series and the positive phase driving electrode and the third energy storage capacitor to be connected in series in a positive direction during a fourth period, wherein the positive phase driving electrode charges the negative phase driving electrode through the third energy storage capacitor so that the voltage across the positive phase driving electrode is equal to the third positive voltage and the voltage across the negative phase driving electrode is equal to the first positive voltage; and simultaneously controlling the positive phase driving electrode to be connected to the ground terminal GND, the negative phase driving electrode to be connected to the power supply voltage generating circuit, the positive phase driving electrode to discharge to the ground terminal GND, the power supply voltage to charge the negative phase driving electrode, so that the voltage across the positive phase driving electrode is equal to the zero voltage, and the voltage across the negative phase driving electrode is equal to the power supply voltage.
Optionally, the switch circuit is further configured to control the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series and the positive phase driving electrode is connected in series with the third energy storage capacitor in a positive direction, 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 a fourth positive voltage and the voltage across the positive phase driving electrode is equal to a fifth positive voltage; controlling the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode in parallel for a seventh period, the negative phase driving electrode charging the third energy storage capacitor and the positive phase driving electrode such that a voltage across the positive phase driving electrode is equal to a voltage across the negative phase driving electrode and equal to the second positive voltage; and controlling the positive phase driving electrode, the third energy storage capacitor, the negative phase driving electrode to be connected in series and the positive phase driving electrode to be connected in series with the third energy storage capacitor in reverse, the negative phase driving electrode charging the positive phase driving electrode through the third energy storage capacitor so that the voltage across the positive phase driving electrode is equal to the fourth positive voltage and the voltage across the negative phase driving electrode is equal to the fifth positive voltage in an eighth period;
the fourth positive voltage is higher than the fifth positive voltage and lower than the power supply voltage.
Optionally, the switch circuit further comprises a sixth switch circuit, a seventh switch circuit, an eighth switch circuit, a ninth switch circuit, and a tenth switch circuit;
during the first period, the sixth switching circuit is turned on; during the second period, the seventh switching circuit is turned on; during the third period, the eighth switching circuit is turned on; in the fourth period, the ninth switching circuit is turned on; during the fifth period, the tenth switching circuit is turned on; in the sixth period, the ninth switching circuit is turned on; in the seventh period, the eighth switching circuit is turned on; during the eighth period, the seventh switching circuit is turned on;
and when any one of the switch circuits is switched on, the other four switch circuits are switched off.
Optionally, the sixth switching circuit further comprises an eighth switch S 8 And a ninth switch S 9 (ii) a The seventh switching circuit further comprises a tenth switch S 10 And an eleventh switch S 11 (ii) a The eighth switching circuit further comprises a twelfth switch S 12 Thirteenth switch S 13 And a fourteenth switch S 14 (ii) a What is needed isThe ninth switching circuit further comprises a fifteenth switch S 15 And a sixteenth switch S 16 (ii) a The tenth switching circuit further includes a seventeenth switch S 17 And an eighteenth switch S 18 ；
The eighth switch S 8 Is connected to the supply voltage generating circuit, the eighth switch S 8 Is connected to the positive phase driving electrode;
the ninth switch S 9 Is connected to the ground terminal GND, the ninth switch S 9 Is connected to the negative phase drive electrode;
the tenth switch S 10 Is connected to the first end of the third energy storing capacitor, the tenth switch S 10 Is connected to the positive phase driving electrode;
the eleventh switch S 11 Is connected to the second terminal of the third energy storage capacitor, the eleventh switch S 11 Is connected to the negative phase drive electrode;
the twelfth switch S 12 Is connected to the first end of the third energy storage capacitor, and the twelfth switch S 12 Is connected to the positive phase driving electrode;
the thirteenth switch S 13 Is connected to a first terminal of the third energy storage capacitor, the thirteenth switch S 13 Is connected to the negative phase drive electrode;
the fourteenth switch S 14 Is connected to the second end of the third energy storage capacitor, and the fourteenth switch S 14 Is connected to the ground terminal GND;
the fifteenth switch S 15 Is connected to the second end of the third energy storage capacitor, and the fifteenth switch S 15 Is connected to the positive phase driving electrode;
the sixteenth switch S 16 Is connected to the first end of the third energy storage capacitor, the sixteenth switch S 16 To (1) aTwo ends of the negative phase driving electrode are connected with the negative phase driving electrode;
the seventeenth switch S 17 Is connected to the ground terminal GND, the seventeenth switch S 17 Is connected to the positive phase driving electrode;
the eighteenth switch S 18 Is connected to the supply voltage generating circuit, the eighteenth switch S 18 Is connected to the negative phase drive electrode.
Optionally, during the first period, only the eighth switch S 8 And the ninth switch S 9 Closing at the same time; during the second period, only the tenth switch S 10 And the eleventh switch S 11 Closing; during the third period, only the twelfth switch S 12 The thirteenth switch S 13 And said fourteenth switch S 14 Closing; during the fourth period, only the fifteenth switch S 15 And the sixteenth switch S 16 Closing; during the fifth period, only the seventeenth switch S 17 And said eighteenth switch S 18 Closing; during the sixth period, only the fifteenth switch S 15 And the sixteenth switch S 16 Closing; during the seventh period, only the twelfth switch S 12 The thirteenth switch S 13 And the fourteenth switch S 14 Closing; during the eighth period, only the tenth switch S 10 And the eleventh switch S 11 And (5) closing.
Optionally, when the voltage across the third energy storage capacitor is established to a stable value, the amplitude of the first positive voltage minus the amplitude of the third positive voltage is equal to the voltage across the third energy storage capacitor;
the amplitude of the second positive voltage is equal to the voltage value of two ends of the third energy storage capacitor;
the amplitude of the fourth positive voltage minus the amplitude of the fifth positive voltage is equal to the voltage value across the third energy storage capacitor.
Alternatively, when the equivalent capacitance value of the positive phase driving electrode is equal to the equivalent capacitance value of the negative phase driving electrode, the fourth positive voltage is equal to the first positive voltage, and the fifth positive voltage is equal to the third positive voltage.
In a second aspect, 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.
In a third aspect, an embodiment of the present application provides a touch display device, including the touch driving chip according to the second aspect.
It can be understood that, the touch driving chip of the second aspect and the touch display device of the third aspect both employ the corresponding touch driving circuit provided above, and therefore, the beneficial effects achieved by the touch driving chip of the second aspect and the touch display device of the third aspect can refer to the beneficial effects of the corresponding touch driving circuit provided above, and are not repeated herein.
Drawings
One or more embodiments are illustrated by the figures in the accompanying drawings, which correspond to and are not intended to limit the embodiments. The following description refers to the accompanying drawings in which like numerals in different drawings represent like elements. The drawings in the drawings are not to scale unless specifically noted.
Fig. 1 is a schematic structural diagram of a conventional touch driving circuit;
fig. 2 is a schematic signal waveform diagram of a driving signal output by the touch driving circuit shown in fig. 1 in a period;
fig. 3 is a schematic structural diagram of a touch driving circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another touch driving circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram illustrating the operation of the touch driving circuit shown in FIG. 4;
fig. 6 is a schematic signal waveform diagram of the driving signal output by the touch driving circuit shown in fig. 4 in one period;
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 according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram illustrating a working principle of the touch driving circuit shown in fig. 8;
fig. 10 is a schematic diagram of signal waveforms of the driving signal output by the touch driving circuit shown in fig. 8 in one period.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Furthermore, the terms "first," "second," and the like, are used solely to distinguish between similar objects and are not intended to indicate or imply relative importance or to implicitly indicate a number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
The embodiment of the application provides a touch drive circuit, a drive chip and a touch display device. The touch driving circuit can be applied to a capacitive touch display device to drive a driving electrode of the touch display device. The touch display apparatus may further include a display device, and examples of the display device include: liquid Crystal Display (LCD) displays, organic Light Emitting (OLED) displays, plasma Display Panel (PDP) displays, and Cathode Ray (CRT) displays.
Fig. 3 is a schematic structural diagram of a touch driving circuit according to an embodiment of the present disclosure; wherein, the resistance R tx RepresentDriving impedance including equivalent impedance of driving electrode and touch control driving circuit, and capacitor C L Representing the equivalent capacitance of the drive electrode. The touch driving circuit 20 includes a voltage generating circuit 201 and a switch circuit 202, and the voltage generating circuit 201 is electrically connected to the switch circuit 202; the voltage generation circuit 201 includes at least one energy storage capacitor (not shown) that can store the electric charge discharged from the driving electrode and transfer the stored electric charge to the driving electrode; the switch circuit 202 may control the voltage generation 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; the first positive voltage, the second positive voltage and the third positive voltage are voltages provided by the at least one energy storage capacitor, and the amplitude of the voltages satisfies the following relation: supply voltage>A first positive voltage>Second positive voltage>Third positive voltage>Zero voltage.
By additionally arranging the at least one energy storage capacitor, the electric charges released when the driving electrode discharges can be recycled, no extra power consumption is generated in the process of transferring the electric charges between the at least one energy storage capacitor and the driving electrode, and a plurality of intermediate levels are introduced between the power voltage and the zero voltage, so that the voltage variation at two ends of the driving electrode is equivalently reduced when the driving electrode is directly charged by the power voltage, and the driving power consumption of the touch driving circuit is effectively reduced.
Based on the touch driving circuit shown in fig. 3, the voltage generating circuit may further include a power voltage generating circuit, a first energy storage capacitor and a second energy storage capacitor. The power supply voltage generation circuit may generate the power supply voltage. The switching circuit may further control the driving electrode to be connected to a power supply voltage generating circuit for a first period of time, the power supply voltage charging the driving electrode so that the voltage across the driving electrode is equal to the power supply voltage; controlling the driving electrode to be connected to the first energy storage capacitor during the second period, wherein the first energy storage capacitor can store the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the first positive voltage; controlling the driving electrode to be connected with the first energy storage capacitor and the second energy storage capacitor in series in a third time period, and controlling the first energy storage capacitor to be connected with the second energy storage capacitor in series in an opposite direction, wherein the first energy storage capacitor and the second energy storage capacitor can store charges released by the driving electrode, so that the voltage at two ends of the driving electrode is equal to the second positive voltage; controlling the driving electrode to be connected to a second energy storage capacitor during a fourth period, wherein the second energy storage capacitor can store the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the third positive voltage; and controlling the driving electrode to be connected to the ground terminal GND in the fifth period, and discharging the driving electrode to the ground terminal GND so that the voltage across the driving electrode is equal to zero voltage.
In the above process, the voltage across the driving electrode is first reduced from the power supply voltage to the first positive voltage, then reduced from the first positive voltage to the second positive voltage, then reduced from the second positive voltage to the third positive voltage, and then reduced from the third positive voltage to zero voltage, i.e. the driving electrode is always in the discharge state in this process. Two energy storage capacitors are arranged to store electric charges released by the driving electrode in the discharging process, and three intermediate levels are introduced between the power supply voltage and the zero voltage, so that the resistance R of the driving electrode in the discharging process is reduced L And further, the driving power consumption of the touch driving circuit is reduced.
Based on the disclosure of the above embodiment, in this embodiment, the switch circuit may further control the driving electrode to be connected to the second energy-storage capacitor during the sixth period, and the second energy-storage capacitor may transfer the stored charges to the driving electrode, so that the voltage across the driving electrode is equal to the third positive voltage; controlling the driving electrode to be connected with the first energy storage capacitor and the second energy storage capacitor in series in a seventh time period, and controlling the first energy storage capacitor to be connected with the second energy storage capacitor in series in an opposite direction, wherein the first energy storage capacitor and the second energy storage capacitor can transfer stored charges to the driving electrode, so that the voltage at two ends of the driving electrode is equal to the second positive voltage; and controlling the driving electrode to be connected to the first energy storage capacitor during the eighth period, wherein the first energy storage capacitor can transfer the stored charges to the driving electrode, so that the voltage across the driving electrode is equal to the first positive voltage.
In the above process, the voltage across the driving electrode is first increased from zero voltage to the third positive voltage, then increased from the third positive voltage to the second positive voltage, and then increased from the second positive voltage to the first positive voltage, that is, the driving electrode is always in a charged state in this process.
The discharge stage and the charge stage of the driving electrode are combined to form a working cycle of the touch driving circuit, which corresponds to a cycle of the driving signal output by the touch driving circuit. The two energy storage capacitors can store the charges released by the driving electrode in the discharging process and transfer the stored charges back to the driving electrode so as to charge the driving electrode, no extra power consumption is generated in the charge transfer process, and three intermediate levels are introduced between the power supply voltage and the zero voltage so that the signal amplitude of the driving signal in one period is sequentially equal to the power supply voltage, the first positive voltage, the second positive voltage, the third positive voltage, the zero voltage, the third positive voltage, the second positive voltage and the first positive voltage, so that the resistance R can be reduced when the driving electrode is charged L The loss can also reduce the resistance R when the driving electrode discharges L Thereby effectively reducing the driving power consumption of the touch driving circuit.
Based on the disclosure of the above embodiments, in this embodiment, the switch circuit may further include a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, and a fifth switch circuit. In order that the signal amplitude of the drive signal in one period may be equal to the power supply voltage, the first positive voltage, the second positive voltage, the third positive voltage, the zero voltage, the third positive voltage, the second positive voltage, the first positive voltage in sequence, it may be controlled that: in a first period, the first switch circuit is conducted; in a second time period, the second switch circuit is conducted; in a third period, the third switch circuit is turned on; in a fourth time period, the fourth switching circuit is conducted; in a fifth time period, the fifth switch circuit is conducted; in a sixth time period, the fourth switching circuit is conducted; in a seventh period, the third switch circuit is turned on; in the eighth period, the second switch circuit is turned on, and when any one of the switch circuits is turned on, the other four switch circuits are all turned off.
Specifically, the control circuit may be adapted to control each of the switch circuits, so that each of the switch circuits may be periodically and cyclically turned on according to the turn-on sequence, and further control the driving signal to have the 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 may be integrated with the touch driving circuit in different chips, which is not limited in the embodiments of the present application.
Based on the disclosure of the above embodiments, the embodiment of the present application provides a schematic structural diagram of another touch driving circuit, as shown in fig. 4; wherein, the resistance R tx Represents the driving impedance (including the equivalent impedance of the driving electrode and the touch driving circuit), and the capacitance C L Representing the equivalent capacitance of the drive electrode. Specifically, in the switch circuit, the first switch circuit further comprises a first switch S 1 (ii) a The second switch circuit further comprises a second switch S 2 (ii) a The third switch circuit further comprises a third switch S 3 And a fourth switch S 4 (ii) a The fourth switching circuit further comprises a fifth switch S 5 And a sixth switch S 6 (ii) a The fifth switching circuit further comprises a seventh switch S 7 . Specifically, the connection relationship of each element in the touch driving circuit 30 is as follows: first switch S 1 Is connected to the supply voltage generating circuit to access the supply voltage V DD First switch S 1 Is connected to the driving electrode; a second switch S 2 Is connected to the first energy storage capacitor C S1 A first terminal of (1), a second switch S 2 Is connected to the drive electrode; third switch S 3 Is connected to the second energy storage capacitor C S2 A second terminal of (3), a third switch S 3 Is connected to the driving electrode; fourth switch S 4 Is connected to the second energy storage capacitor C S2 A first terminal of (1), a fourth switch S 4 Is connected to the first energy storage capacitor C S1 The first end of (a); fifth switch S 5 Is connected to the second energy storage capacitor C S2 Second terminal of (2), fifth switch S 5 The second end of the first switch is connected to the ground end GND; sixth switch S 6 Is connected to the second energy storage capacitor C S2 A sixth switch S 6 Is connected to the driving electrode; seventh switch S 7 Is connected to ground GND, a seventh switch S 7 Is connected to the driving electrode; a first energy storage capacitor C S1 Is connected to ground GND.
FIG. 5 is a schematic diagram illustrating the operation of the touch driving circuit shown in FIG. 4; wherein, the first energy storage capacitor C S1 The voltage across is denoted V C1 A second energy storage capacitor C S2 The voltage across is denoted V C2 . It can be seen that at t 1 During the time period, only the first switch circuit is turned on, i.e. only the first switch S 1 Closed, supply voltage V DD To the capacitor C L Charging until the capacitor C L The voltage across both ends being equal to the supply voltage V DD 。
At t 2 During the time period, only the second switch circuit is turned on, i.e. only the second switch S 2 Closed, capacitor C L For the first energy storage capacitor C S1 Discharging the first energy-storage capacitor C S1 Storage capacitor C L Released charge up to a capacitance C L The voltage across the terminals is equal to the first positive voltage.
At t 3 During the time period, only the third switch circuit is turned on, i.e. the third switch S 3 And a fourth switch S 4 Are simultaneously closed, capacitance C L To the first energy storage capacitor C S1 And a second energy storage capacitor C S2 The first energy-storage capacitor C S1 And a second energy storage capacitor C S2 Storage capacitor C L Discharged charge up to a capacitance C L The voltage across the terminals is equal to the second positive voltage.
At t 4 During the time interval, only the fourth switch circuit is conducted, i.e. the fifth switch S 5 And a sixth switch S 6 Are simultaneously closed, capacitor C L For the second energy storage capacitor C S2 Discharging until the capacitor C L The voltage across the terminals is equal to the third positive voltage.
At t 5 During this time period, only the fifth switch circuit is turned on, i.e. only the seventh switch S 7 Closed, capacitor C L Discharging to ground until the capacitor C L The voltage across is equal to zero voltage.
At t 6 During the time period, only the fourth switch circuit is turned on, i.e. the fifth switch S 5 And a sixth switch S 6 Simultaneously closed, second energy storage capacitor C S2 To the capacitor C L Charging until the capacitor C L The voltage across the terminals is equal to the third positive voltage.
At t 7 During the time period, only the third switch circuit is turned on, i.e. the third switch S 3 And a fourth switch S 4 Are closed simultaneously, the first energy storage capacitor C S1 And a second energy storage capacitor C S2 In series capacitor to capacitor C L Charging until the capacitor C L The voltage across the terminals is equal to the second positive voltage.
At t 8 During the time period, only the second switch circuit is on, i.e. only the second switch S 2 Closed, first energy storage capacitor C S1 To the capacitor C L Charging until the capacitor C L The voltage across the terminals is equal to the first positive voltage.
The touch driving circuit provided by the embodiment of the application can work circularly for one period according to the eight time periods, and the first energy storage capacitor C S1 Voltage V across C1 And a second energy storage capacitor C S2 Voltage V across C2 During the operation of the cycle, the voltage gradually builds up to a stable value and flows through the first energy storage capacitor C S1 And a second energy storage capacitor C S2 When the voltages at the two ends are all established to a stable value, the amplitude of the first positive voltage is equal to that of the first energy storage capacitor C S1 Voltage value V at both ends C1 The amplitude of the second positive voltage is equal to that of the first energy storage capacitor C S1 Voltage value V at both ends C1 Minus a second energy-storage capacitor C S2 Voltage value V between both ends C2 I.e. equal to V C1 -V C2 The amplitude of the third positive voltage is equal to that of the second energy storage capacitor C S2 Voltage value V between both ends C2 。
It should be noted that, when the first energy storage capacitor C S1 And a second energy storage capacitor C S2 Is much larger than the capacitance C L When the capacitance value of (A) is greater than (B), the first energy storage capacitor C S1 The second energy storageContainer C S2 Storage capacitor C L Discharged charge or to a capacitance C L After transferring the charges, the first energy storage capacitor C S1 And a second energy storage capacitor C S2 The voltage values at both ends hardly change. Specifically, when the first energy storage capacitor C S1 A second energy storage capacitor C S2 Is greater than the capacitance C L When the capacitance value of the first capacitor C is 50 to 100 times, the first capacitor C can be determined S1 A second energy storage capacitor C S2 Is far larger than the capacitance C L The capacitance value of (c).
Based on the law of conservation of charge, the first energy storage capacitor C in the eight time periods is respectively used S1 A second energy storage capacitor C S2 Capacitor C L The charge transfer condition between the first and second capacitors is analyzed to calculate the first energy storage capacitor C S1 And a second energy storage capacitor C S2 The specific values of the first positive voltage, the second positive voltage, and the third positive voltage when the voltages at both ends are established to a stable value. A first energy storage capacitor C is arranged below S1 A second energy storage capacitor C S2 Capacitor C L The capacitance value satisfies the following conditions: c S1 ＝C S2 ＝C S >>C L 。
At t 1 In time interval, the capacitance C L The final value of the voltage across the terminals being equal to the supply voltage V DD 。
At t 2 In time interval, the capacitance C L The initial value of the voltage at both ends is V DD The final value is denoted as V x1 A first energy storage capacitor C S1 The initial value of the voltage at both ends is V C1 The final value is likewise V x1 According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relationship:
C L *(V DD -V x1 )＝C S1 *(V x1 -V C1 ) (formula 1)
From equation 1, one can obtain:
V x1 ＝(C S1 *V C1 +C L *V DD )/(C S1 +C L ) (formula 2)
Because of the first energy storage capacitor C S1 A second energy storage capacitorC S2 Capacitor C L The capacitance value satisfies the following conditions: c S1 ＝C S2 ＝C S >>C L So, according to equation 2, it can be obtained:
V x1 ≈(1-C L /C S )*V C1 +C L /C S *V DD (formula 3)
At t 3 In time interval, the capacitance C L The initial value of the voltage at both ends is V x1 Final value of V x2 (ii) a A first energy storage capacitor C S1 The initial value of the voltage at both ends is V x1 Final value of V x3 (ii) a Second energy storage capacitor C S2 The initial value of the voltage at both ends is V C2 Final value of V x3 -V x2 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relationship:
C S1 *(V x3 -V x1 )＝C L *(V x1 -V x2 ) (ii) a (formula 4)
C S2 *(V x2 -V x3 )+C S2 *V C2 ＝C L *(V x1 -V x2 ) (formula 5)
From equation 4 and equation 5, one can obtain:
V x2 ≈(1-C L /C S )*V C1 -(1-2*C L /C S )*V C2 +C L /C S *V DD (ii) a (equation 6)
V x1 ≈(1-C L /C S )*V C1 +C L /C S *V C2 +C L /C S *V DD (equation 7)
At t 4 In time interval, the capacitance C L The initial value of the voltage at both ends is V x3 -V x2 Final value of V x4 (ii) a A second energy storage capacitor C S2 The initial value of the voltage at both ends is V x2 The final value is likewise V x4 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relation:
C L *(V x2 -V x4 )＝C S2 *[V x4 -(V x3 -V x2 )](equation 8)
From equation 8, one can obtain:
V x4 ≈(1-3*C L /C S )*V C2 +C L /C S *V C1 (equation 9)
At t 5 At the end of the time period, the capacitance C L Discharge to ground until the voltage across it equals zero, so at t 6 In time interval, the capacitance C L The initial value of the voltage at both ends is 0 and the final value is V x5 A second energy storage capacitor C S2 The initial value of the voltage at both ends is V x4 The final value is likewise V x5 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relationship:
C L *V x5 ＝C S2 *(V x4 -V x5 ) (formula 10)
From equation 10, one can obtain:
V x5 ≈C L /C S *V C1 +(1-4*C L /C S )*V C2 (formula 11)
At t 7 In time interval, the capacitance C L The initial value of the voltage at both ends is V x5 Final value of V x6 (ii) a A first energy storage capacitor C S1 The initial value of the voltage at both ends is V x3 Final value of V x7 (ii) a Second energy storage capacitor C S2 The initial value of the voltage at both ends is V x5 Final value of V x7 -V x6 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relationship:
C L *(V x6 -V x5 )＝C S1 *(V x3 -V x7 )＝C S2 *[(V x7 -V x6 )-V x5 ](formula 12)
From equation 12, one can obtain:
V x6 ≈(1-4*C L /C S )*V C1 -(1-4*C L /C S )*V C2 +C L /C S *V DD (ii) a (formula 13)
V x7 ≈(1-2*C L /C S )*V C1 +3*C L /C S *V C2 +C L /C S *V DD (formula 14)
At t 8 In time interval, the capacitance C L The initial value of the voltage at both ends is V x6 Final value of V x8 (ii) a A first energy storage capacitor C S1 The initial value of the voltage at both ends is V x7 The final value is likewise V x8 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relation:
C S1 *(V x7 -V x8 )＝C L *(V x8 -V x6 ) (formula 15)
From equation 15, one can obtain:
V x8 ≈(1-2*C L /C S )*V C1 +2*C L /C S *V C2 +C L /C S *V DD (formula 16)
When the first energy storage capacitor C S1 Voltage V across C1 And a second energy storage capacitor C S2 Voltage V across C2 When the steady state is reached, the following relationship is satisfied:
V x7 -V x6 ＝V C2 (ii) a (formula 17)
V x8 ＝V C1 (formula 18)
From equations 17 and 18, it can be calculated:
Figure GDA0003769881910000141
thus, the first energy storage capacitor C S1 And a second energy storage capacitor C S2 After the voltages at the two ends are stabilized, the first positive voltage, the second positive voltage and the third positive voltage are respectively equal to 3/4V DD 、1/2V DD 、1/4V DD 。
As shown in fig. 6, it is a schematic diagram of a signal waveform of the driving signal output by the touch driving circuit shown in fig. 4 in one period; the waveform of the drive signal is based on the first energy storage capacitor C S1 And a second energy storage capacitor C S2 A situation where the voltage across the terminals has already been established to a stable value. It can be seen that the waveform of the driving signal is stepped, and one cycle of the driving signal can be divided into eight time periods, which correspond to four different signal amplitudes, namely, the power voltage VDD and the first positive voltage 3/4V, respectively DD A second positive voltage of 1/2V DD The third positive voltage is 1/4V DD . Because only one time interval is directly charged by the power supply voltage in the whole period, and the voltage across the driving electrode in the time interval is from 3/4V DD Is raised to V DD So the consumed power supply energy Δ Q is:
ΔQ＝C L *(V DD -3/4*V DD )＝1/4*C L *V DD (formula 19)
Therefore, the driving power consumption of the touch driving circuit in one period T is as follows:
P＝V DD *ΔQ/T＝1/4*C L *V DD 2 * f. (formula 20)
The touch control driving circuit provided by the embodiment of the application introduces three intermediate levels between a power supply voltage and a zero voltage by additionally arranging two energy storage capacitors, which is equivalent to reducing the voltage variation at two ends of a driving electrode when the driving electrode is directly driven by the power supply voltage, so that compared with the traditional touch control driving circuit shown in fig. 1, under the condition of providing driving signals with the same amplitude, the driving power consumption of the touch control driving circuit provided by the embodiment of the application in one period T is obviously reduced and is only 25% of that of the traditional touch control driving circuit.
Next, the driving power consumption of the touch driving circuit is calculated from another angle, as shown in fig. 6, wherein eight shaded parts represent the driving impedance R in one period T L Loss in the optical path. To facilitate the calculation of the driving impedance R during a period T L The circuit model shown in fig. 7 can be used, and the circuit model can represent any one time period t i (i =1,2 \ 82308); and in the case where the internal touch drive circuit charges or discharges the drive electrode.
The current magnitude when the touch driving circuit charges or discharges the driving electrode is as follows:
Figure GDA0003769881910000151
due to the fact that
Figure GDA0003769881910000152
So from equation 21 it can be found that:
Figure GDA0003769881910000153
the driving resistance R in one period can be obtained from equation 22 L The energy consumed is:
Figure GDA0003769881910000154
thus, the impedance R is driven in one period T L Loss of 1/4 x C L *V DD 2 * f, where f =1/T, represents the frequency of the drive signal.
After the switch circuit is conducted, the capacitor C L The voltage across the terminals often varies in a non-ideal manner, i.e. the capacitance C L Therefore, in order to ensure that the driving power consumption of the touch driving circuit and the amplitude of the output driving signal can reach a preset target value, the turn-on time of the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit and the fifth switch circuit may be set to be greater than or equal to the time when the voltages at the two ends of the driving electrode are set to reach a stable value in a corresponding period.
On the other hand, the mutual capacitance detection application may also adopt an orthogonal coding method, that is, at the same time, a part of the driving electrodes are driven by a driving waveform with a positive phase, which is called positive phase driving electrodes, and another part of the driving electrodes are driven by a driving waveform with a negative phase, which is called negative phase driving electrodes. Aiming at the code printing mode, the embodiment of the application also provides a touch drive circuit which can drive the positive phase drive electrode and the negative phase drive electrode simultaneously, so that the touch detection application adopting the orthogonal code printing mode is better adapted.
Based on the touch driving circuit shown in fig. 3, the voltage generating circuit may further include a power voltage generating circuit and a third energy storage capacitor. The power supply voltage generation circuit may generate the power supply voltage. The switching circuit may further simultaneously control the positive phase driving electrode to be connected to the power supply voltage generating circuit, the negative phase driving electrode to be connected to the ground terminal GND, the power supply voltage charging the positive phase driving electrode, the negative phase driving electrode discharging the ground terminal GND so that the voltage across the positive phase driving electrode is equal to the power supply voltage, and the voltage across the negative phase driving electrode is equal to zero voltage in the first period; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series in a second time period, wherein the positive phase driving electrode is connected with the third energy storage capacitor in series in an opposite direction, the positive phase driving electrode charges the negative phase driving electrode through the third energy storage capacitor, so that the voltage at two ends of the positive phase driving electrode is equal to the first positive voltage, and the voltage at two ends of the negative phase driving electrode is equal to the third positive voltage; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in parallel during a third period of time, and charging the third energy storage capacitor and the negative phase driving electrode by the positive phase driving electrode, so that the voltage across the positive phase driving electrode is equal to the voltage across the negative phase driving electrode and equal to the second positive voltage; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series in a fourth time period, wherein the positive phase driving electrode is connected with the third energy storage capacitor in a positive direction in series, the positive phase driving electrode charges the negative phase driving electrode through the third energy storage capacitor, so that the voltage at two ends of the positive phase driving electrode is equal to the third positive voltage, and the voltage at two ends of the negative phase driving electrode is equal to the first positive voltage; and simultaneously controlling the positive phase driving electrode to be connected to the ground terminal GND and the negative phase driving electrode to be connected to the power supply voltage generating circuit in a fifth period, the positive phase driving electrode discharging to the ground terminal GND and the power supply voltage charging to the negative phase driving electrode, so that the voltage across the positive phase driving electrode is equal to zero voltage and the voltage across the negative phase driving electrode is equal to the power supply voltage.
In the above process, the voltage across the positive phase driving electrode is first reduced from the power supply voltage to a first positive voltage, while the voltage across the negative phase driving electrode is increased from zero voltage to a third positive voltage; the voltage across the positive phase driving electrode is reduced from the first positive voltage to a second positive voltage, and the voltage across the negative phase driving electrode is increased from a third positive voltage to the second positive voltage; the voltage at the two ends of the positive phase driving electrode is reduced from the second positive voltage to a third positive voltage, and meanwhile, the voltage at the two ends of the negative phase driving electrode is increased from the second positive voltage to the first positive voltage; then the voltage across the positive phase driving electrode is reduced from the third positive voltage to zero voltage, and simultaneously the voltage across the negative phase driving electrode is increased from the first positive voltage to the power supply voltage, i.e. the positive phase driving electrode is in a discharging state and the negative phase driving electrode is in a charging state in the process. Through setting up a third energy storage capacitor to utilize switching circuit to switch the series-parallel connection state between third energy storage capacitor, positive phase drive electrode, negative phase drive electrode three, introduced three middle level between mains voltage and zero voltage, thereby resistance R when having reduced positive phase drive electrode and discharging L Loss in the negative phase, and resistance R when charging the negative phase drive electrode L And the driving power consumption of the touch driving circuit is further reduced.
Based on the disclosure of the above embodiments, in this embodiment, the switch circuit may further control the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in series in a sixth period, and the positive phase driving electrode is connected in series with the third energy storage capacitor in a 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; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in parallel in a seventh time period, and charging the third energy storage capacitor and the positive phase driving electrode by the negative phase driving electrode, so that the voltage at two ends of the positive phase driving electrode is equal to the voltage at two ends of the negative phase driving electrode and equal to the second positive voltage; and controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series in an eighth time period, wherein the positive phase driving electrode is reversely connected in series with the third energy storage capacitor, and the negative phase driving electrode charges the positive phase driving electrode through the third energy storage capacitor, so that the voltage at two ends of the positive phase driving electrode is equal to the fourth positive voltage, and the voltage at two ends of the negative phase driving electrode is equal to the fifth positive voltage. The magnitude of the fourth positive voltage and the magnitude of the fifth positive voltage satisfy that: supply voltage > fourth positive voltage > fifth positive voltage > zero voltage.
In the above process, the voltage across the positive phase driving electrode is first raised from zero voltage to a fifth positive voltage, while the voltage across the negative phase driving electrode is lowered from the power supply voltage to a fourth positive voltage; the voltage at the two ends of the positive phase driving electrode is increased from the fifth positive voltage to the second positive voltage, and the voltage at the two ends of the negative phase driving electrode is decreased from the fourth positive voltage to the second positive voltage; then, the voltage across the positive phase driving electrode is increased from the second positive voltage to the fourth positive voltage, and simultaneously, the voltage across the negative phase driving electrode is decreased from the second positive voltage to the fifth positive voltage, i.e., in the process, the positive phase driving electrode is in a charging state, and the negative phase driving electrode is in a discharging state. By combining this process with the previous process, a working period of the touch driving circuit can be formed, corresponding to a period of the driving signal output by the touch driving circuit. The electric charge that positive phase drive electrode and negative phase drive electrode released in the discharge process can be recycled to third energy-storage capacitor to realize charging positive phase drive electrode and negative phase drive electrode, can not produce extra consumption in this charge transfer process, and switching circuit is through switching over third energy-storage capacitor, positive phase drive electrode, the series-parallel connection state between the negative phase drive electrode three, five middle levels have been introduced between mains voltage and zero voltage, make driving signal have the signal waveform of echelonment, can adapt to the drive mode of quadrature beat code well simultaneously.
Based on the disclosure of the above embodiments, in this embodiment, the switch circuit may further include: a sixth switching circuit, a seventh switching circuit, an eighth switching circuit, a ninth switching circuit, and a tenth switching circuit. In order to make the driving signal have the stepped signal waveform, the following control steps are performed: in the first period, the sixth switching circuit is conducted; in the second period, the seventh switch circuit is conducted; in the third period, 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 time period, the ninth switch circuit is turned on; in the seventh period, the eighth switch circuit is turned on; in the eighth time period, the seventh switching circuit is turned on; when any one of the switch circuits is switched on, the other four switch circuits are switched off.
Specifically, the control circuit may be used to control the switch circuit, so that the switch circuit may be periodically and cyclically turned on according to the turn-on sequence, and the driving signal output by the touch driving circuit is further controlled to have the 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 may be integrated with the touch driving circuit in different chips, which is not limited in the embodiments of the present application.
Based on the disclosure of the above embodiments, the present embodiment provides a schematic structural diagram of another touch driving circuit, as shown in fig. 8, to adapt to a touch detection scenario adopting an orthogonal coding method; wherein, the resistance R tx,p And a resistance R tx,n Respectively representing positive phase driving impedance and negative phase driving impedance, a capacitor C L,p And a capacitor C L,n Respectively, the equivalent capacitances of the positive phase drive electrode and the negative phase drive electrode. In the switch circuit, the sixth switch circuit further comprises an eighth switch S 8 And a ninth switch S 9 (ii) a The seventh switching circuit further comprises a tenth switch S 10 And an eleventh switch S 11 (ii) a The eighth switching circuit further comprises a twelfth switch S 12 Thirteenth opening (III)Off S 13 And a fourteenth switch S 14 (ii) a The ninth switching circuit further comprises a fifteenth switch S 15 And a sixteenth switch S 16 (ii) a The tenth switching circuit further includes a seventeenth switch S 17 And an eighteenth switch S 18 . Specifically, the connection relationship of each element in the touch driving circuit 40 is as follows: eighth switch S 8 Is connected to the power supply voltage generating circuit and is connected to the power supply voltage V DD The eighth switch S 8 Is connected to the positive phase driving electrode; ninth switch S 9 Is connected to ground GND, a ninth switch S 9 Is connected to the negative phase drive electrode; tenth switch S 10 Is connected to the third energy-storing capacitor C S3 First terminal of (1), tenth switch S 10 Is connected to the positive phase driving electrode; eleventh switch S 11 Is connected to the third energy-storing capacitor C S3 Second terminal of (1), eleventh switch S 11 Is connected to the negative phase driving electrode; twelfth switch S 12 Is connected to the twelfth switch S 12 Is connected to the twelfth switch S 12 Is connected to the positive phase driving electrode; thirteenth switch S 13 Is connected to the third energy storage capacitor C S3 A first terminal of (1), a thirteenth switch S 13 Is connected to the negative phase drive electrode; fourteenth switch S 14 Is connected to the third energy storage capacitor C S3 A second terminal of (1), a fourteenth switch S 14 The second end of the first switch is connected to the ground end GND; fifteenth switch S 15 Is connected to the third energy-storing capacitor C S3 A second terminal of (2), a fifteenth switch S 15 A second terminal of the positive phase driving electrode; sixteenth switch S 16 Is connected to the third energy storage capacitor C S3 First terminal of (2), sixteenth switch S 16 Is connected to the negative phase drive electrode; seventeenth switch S 17 Is connected to ground terminal GND, a seventeenth switch S 17 Is connected to the positive phase driving electrode; eighteenth switch S 18 Is connected to the power supply voltage generating circuit, eighteenthSwitch S 18 Is connected to the negative phase drive electrode.
FIG. 9 is a schematic diagram illustrating the operation of the touch driving circuit shown in FIG. 8; to easily and clearly show that the third energy-storage capacitor C is used in the touch driving circuit during operation S3 The positive phase driving electrode and the negative phase driving electrode, and the resistor R is omitted tx,p And a resistance R tx,n A third energy storage capacitor C S3 The voltage across is denoted V C3 Capacitor C L,p The voltage across is denoted V p Capacitor C L,n The voltage across is denoted V n And a capacitance C L,p And a capacitor C L,n The capacitance value between satisfies: c L,p /C L,n ＝k(k>0)。
At t 1 During the time period, only the sixth switch circuit is turned on, i.e. only the eighth switch S 8 And a ninth switch S 9 Are simultaneously closed, supply voltage V DD To the capacitor C L,p Charging is carried out until the capacitor C L,p Voltage V across p Equal to the supply voltage V DD Capacitor C L,n Discharging to ground until the capacitor C L,n Voltage V across n Equal to 0.
At t 2 During the time period, only the seventh switch circuit is turned on, i.e. only the tenth switch S 10 And an eleventh switch S 11 Are simultaneously closed, capacitance C L,p Through a third energy storage capacitor C S3 To the capacitor C L,n Charging is carried out until the capacitor C L,p Voltage V across p Equal to a first positive voltage, a capacitor C L,n Voltage V across n Equal to a third positive voltage; capacitor C L,n Variation amount Δ V of both-end voltage n And a capacitor C L,p Variation amount Δ V of both-end voltage p The ratio is equal to k (Δ V) n /ΔV p ＝k)。
At t 3 During the time period, only the eighth switch circuit is turned on, i.e. only the twelfth switch S 12 And a thirteenth switch S 13 And a fourteenth switch S 14 Are simultaneously closed, capacitance C L,p And a third energy storage capacitor C S3 Capacitor C L,n Parallel connection, a capacitor C L,p To the third energy storage capacitor C S3 And a capacitor C L,n Charging is carried out until the capacitor C L,p And a capacitor C L,n The voltages at both ends are equal and equal to the second positive voltage.
At t 4 During the time period, only the ninth switch circuit is turned on, i.e., only the fifteenth switch S 15 And a sixteenth switch S 16 Are simultaneously closed, capacitor C L,p Through a third energy storage capacitor C S3 To the capacitor C L,n Charging is carried out until the capacitor C L,n Voltage V across n Equal to a first positive voltage, a capacitor C L,p Voltage V across p Equal to a third positive voltage; capacitor C L,n Variation amount Δ V of both-end voltage n And a capacitor C L,p Variation amount Δ V of both-end voltage p The ratio of k to Δ V is equal to k (Δ V) n /ΔV p ＝k)。
At t 5 During the time period, only the tenth switching circuit is turned on, i.e., only the seventeenth switch S 17 And an eighteenth switch S 18 Are closed simultaneously, the supply voltage V DD To the capacitor C L,n Charging is carried out until the capacitor C L,n Voltage V across n Equal to the supply voltage V DD Capacitance C L,p Discharging to ground until the capacitor C L,p Voltage V across p Equal to 0.
At t 6 During the time period, only the ninth switch circuit is turned on, i.e., only the fifteenth switch S 15 And a sixteenth switch S 16 Are simultaneously closed, capacitance C L,n Through a third energy storage capacitor C S3 To the capacitor C L,p Charging is carried out until the capacitor C L,n Voltage V across n Equal to a fourth positive voltage, capacitor C L,p Voltage V across p Equal to a fifth positive voltage; capacitor C L,n Variation amount Δ V of both-end voltage n And a capacitor C L,p Variation amount Δ V of both-end voltage p The ratio is equal to k (Δ V) n /ΔV p ＝k)。
At t 7 During the time period, only the eighth switch circuit is turned on, i.e. only the twelfth switch S 12 Thirteenth switch S 13 And a fourteenth switch S 14 Are simultaneously closed, capacitor C L,n And a third energy storage capacitor C S3 Capacitor C L,p Parallel connection, a capacitor C L,n To the third energy storage capacitor C S3 And a capacitor C L,p Charging is carried out until the capacitor C L,p And a capacitor C L,n The voltages at both ends are equal and equal to the second positive voltage.
At t 8 During the time period, only the seventh switch circuit is turned on, i.e. only the tenth switch S 10 And an eleventh switch S 11 Are simultaneously closed, capacitance C L,n Through a third energy storage capacitor C S3 To the capacitor C L,p Charging is carried out until the capacitor C L,p Voltage V across p Equal to a fourth positive voltage, capacitor C L,n Voltage V across n Equal to a fifth positive voltage; capacitor C L,n Variation amount Δ V of both-end voltage n And a capacitor C L,p Variation amount Δ V of both-end voltage p The ratio is equal to k (Δ V) n /ΔV p ＝k)。
Therefore, the touch driving circuit provided by the embodiment of the application can work circularly for one period according to the eight time periods. Third energy storage capacitor C S3 Voltage V across C3 During the operation of this cycle, the voltage gradually builds up to a stable value, and when the third energy-storage capacitor C is used S3 When the voltages at the two ends are established to be stable values, the amplitude of the first positive voltage minus the amplitude of the third positive voltage is equal to that of the third energy storage capacitor C S3 Voltage value V at both ends C3 (ii) a The amplitude of the second positive voltage is equal to that of the third energy storage capacitor C S3 Voltage value V at both ends C3 (ii) a The amplitude of the fourth positive voltage minus the amplitude of the fifth positive voltage is equal to that of the third energy storage capacitor C S3 Voltage value V at both ends C3 。
In addition, according to the charge conservation law, the third energy storage capacitor C can be obtained S3 Is much larger than the capacitance C L,p And a capacitor C L,n When the capacitance value of the third energy storage capacitor C is equal to S3 When the voltage at the two ends is stable, the second voltage value is approximately equal to V DD /2. Specifically, when the third energy storage capacitor C S3 Is larger than the capacitance C L,p And a capacitor C L,n Can be judged when the capacitance value of (1) is 50-100 timesThird energy storage capacitor C S3 Is much larger than the capacitance C L,p And a capacitor C L,n The capacitance value of (2).
Therefore, at the above-mentioned t 4 In time interval, the capacitance C L,p The initial value of the voltage at both ends is V DD (iv) the final value is denoted by V y1 Capacitor C L,n The initial value of the voltage at both ends is V DD (iv) the final value is denoted by V y2 (ii) a According to the law of conservation of charge, the voltage value and the capacitance value satisfy the following relationship:
C L,p *(V DD /2-V y1 )＝C L,n *(V y2 -V DD 2); (formula 24)
V y2 -V y1 ＝V DD 2; (equation 25)
C L,p /C L,n ＝k,C L,p +C L,n ＝C L (formula 26)
From equations 24 through 26, we can obtain:
Figure GDA0003769881910000211
Figure GDA0003769881910000212
within a period T, corresponding to T alone 1 Period and t 5 The charge being supplied directly from a power supply, where t 1 Capacitance C within a period of time L,p Amount of charge Δ Q taken from power supply 1 Comprises the following steps:
Figure GDA0003769881910000213
in the same way, t 5 Capacitance C in time interval L,n Amount of charge Δ Q taken from power supply 2 Comprises the following steps:
Figure GDA0003769881910000214
from equations 29 and 30, the average current drawn from the power supply during a period T is:
Figure GDA0003769881910000215
therefore, the driving power consumption of the touch driving circuit in one period T is:
Figure GDA0003769881910000216
where f is the frequency of the drive signal, and f =1/T.
According to the formula 32, the driving power consumption of the touch driving circuit increases with the increase of the k value, and the maximum value is 1/2 × c L *V DD 2 * f; specifically, when k =1, the driving power consumption of the touch driving circuit is 1/4 × c L *V DD 2 *f。
The touch driving circuit provided by the embodiment of the application can be additionally provided with only one external capacitor (third energy storage capacitor), so that the driving power consumption of the touch driving circuit is effectively reduced, the area and the cost of a touch detection PCB are saved, and the touch driving circuit can be well suitable for a touch detection application scene which adopts an orthogonal coding mode and has symmetrical positive code and negative code channels.
When the third energy storage capacitor C S3 When the voltages at the two ends are stable, the waveform diagram of the driving signals corresponding to the positive phase driving electrode and the negative phase driving electrode in an ideal state is shown in fig. 10, in which the influence of the driving impedance is ignored; wherein, the capacitor C L,p And a capacitor C L,n The capacitance value between satisfies: c L,p /C L,n ＝k，0<k<1. It can be seen that the driving voltages on the positive phase driving electrode and the negative phase driving electrode are in opposite trend synchronous change, and the waveforms of the driving signals are in a step shape; the magnitude relation of each driving voltage in the figure satisfies: supply voltage>Fourth positive voltage>A first positive voltage>Second positive voltage>Fifth positiveVoltage of>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.
In addition, when k =1,c S3 >>C L And a third energy storage capacitor C S3 When the voltages at the two ends are stable, the magnitude relation of each driving voltage meets the following conditions: the first positive voltage and the fourth positive voltage are approximately equal to 3/4V DD The third and fifth positive voltages 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 difference between the second positive voltage and the third positive voltage or the fifth positive voltage; when k is>1, and a third energy storage capacitor C S3 When the voltages at the two ends are stable, the magnitude relation of each driving voltage meets the following conditions: supply voltage>A first positive voltage>Fourth positive voltage>A second positive voltage>Third positive voltage>Fifth positive voltage>Zero voltage, where 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.
It should be noted that fig. 10 is a schematic diagram of an ideal waveform of the coding signal, but after the switch circuit is turned on, the capacitor C is turned on L,p And a capacitor C L,n The voltage across the terminals often varying in a non-ideal manner, i.e. the capacitance C L,p And a capacitor C L,n Therefore, in order to ensure that the driving power consumption of the touch driving circuit and the amplitude of the output driving signal provided by the embodiment of the present application can reach a preset target value, the conduction time of the sixth switching circuit, the seventh switching circuit, the eighth switching circuit, the ninth switching circuit, and the tenth switching circuit may be set to be greater than or equal to the time when the voltages at the two ends of the positive phase driving electrode and the negative phase driving electrode are set to reach the stable value in the corresponding time period.
The embodiment of the present application provides a touch driving chip, where the touch driving chip includes the touch driving circuit provided in the above embodiment, and it should be noted that the touch driving chip may further include other circuits, for example, a control circuit, which is used to control the switching circuit to be periodically turned on in a preset manner.
The embodiment of the application provides a touch display device, which comprises the touch driving chip provided by the embodiment.
The touch display apparatus may include a display device such as a liquid crystal display, an organic light emitting display, a plasma display, a cathode ray display, and the like.
It should be understood that the detailed description in the embodiments of the present application is only for helping those skilled in the art to better understand the embodiments of the present application, and does not limit the scope of the embodiments of the present application, and those skilled in the art can make various improvements and modifications on the embodiments described above, and these improvements and modifications all fall into the protection scope of the present application.

Claims (15)

1. A touch driving circuit for outputting a driving signal to drive a driving electrode of a touch display device, the touch driving circuit comprising: a voltage generating circuit and a switching circuit; the voltage generating circuit is electrically connected with the switch circuit;
the voltage generating circuit comprises a power supply voltage generating circuit and at least one energy storage capacitor; the power supply voltage generating circuit is used for generating power supply voltage; the at least one energy storage capacitor is used for storing the charges released by the driving electrode and transferring the stored charges to the driving electrode;
the switch circuit is used for controlling the voltage generating circuit to periodically output the power supply voltage, the first positive voltage, the second positive voltage, the third positive voltage and the zero voltage;
the first positive voltage, the second positive voltage, and the third positive voltage are voltages provided by the at least one energy storage capacitor, and the supply voltage is higher than the first positive voltage, the first positive voltage is higher than the second positive voltage, the second positive voltage is higher than the third positive voltage, the third positive voltage is higher than the zero voltage;
the at least one energy storage capacitor comprises a first energy storage capacitor and a second energy storage capacitor; the switch circuit is used for controlling the driving electrode to be connected to the power supply voltage generating circuit in a first period, and the power supply voltage charges the driving electrode so that the voltage at the two ends of the driving electrode is equal to the power supply voltage; controlling the driving electrode to be connected to the first energy storage capacitor during a second period, wherein the first energy storage capacitor is used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the first positive voltage; controlling the driving electrode to be connected in series with the first energy storage capacitor and the second energy storage capacitor in series and in reverse, and the first energy storage capacitor and the second energy storage capacitor are used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the second positive voltage; controlling the driving electrode to be connected to the second energy storage capacitor in a fourth period, wherein the second energy storage capacitor is used for storing the charges released by the driving electrode, so that the voltage across the driving electrode is equal to the third positive voltage; and controlling the driving electrode to be connected to a ground terminal GND in a fifth period, and discharging the driving electrode to the ground terminal GND so that the voltage across the driving electrode is equal to the zero voltage.
2. The touch driving circuit of claim 1, wherein the switching circuit is further configured to control the driving electrode to be connected to the second energy storage capacitor during a sixth time period, and the second energy storage capacitor is configured to transfer stored charges to the driving electrode, so that a voltage across the driving electrode is equal to the third positive voltage; controlling the driving electrode to be connected with the first energy storage capacitor and the second energy storage capacitor in series and in inverse series in a seventh time period, wherein the first energy storage capacitor and the second energy storage capacitor are used for transferring stored charges to the driving electrode, so that the voltage across the driving electrode is equal to the second positive voltage; and controlling the driving electrode to be connected to the first energy storage capacitor during an eighth period, the first energy storage capacitor being configured to transfer stored charge to the driving electrode such that the voltage across the driving electrode is equal to the first positive voltage.
3. The touch driving circuit according to claim 2, wherein the switch circuit further comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, and a fifth switch circuit;
in the first period, the first switch circuit is conducted; in the second period, the second switch circuit is conducted; during the third period, the third switch circuit is turned on; in the fourth period, the fourth switch circuit is turned on; during the fifth period, the fifth switch circuit is turned on; in the sixth period, the fourth switch circuit is turned on; in the seventh period, the third switch circuit is turned on; in the eighth time period, the second switch circuit is turned on;
and when any one of the switching circuits is switched on, the other four switching circuits are switched off.
4. The touch control driving circuit of claim 3, wherein the first switch circuit further comprises a first switch S 1 (ii) a The second switch circuit further comprises a second switch S 2 (ii) a The third switch circuit further comprises a third switch S 3 And a fourth switch S 4 (ii) a The fourth switching circuit further comprises a fifth switch S 5 And a sixth switch S 6 (ii) a The fifth switch circuit further comprises a seventh switch S 7 ；
The first switch S 1 Is connected to the supply voltage generating circuit, the first switch S 1 Is connected to the drive electrode;
the second switch S 2 Is connected to the first end of the first energy storing capacitor, the second switch S 2 Is connected to the driveA moving electrode;
the third switch S 3 Is connected to the second end of the second energy storage capacitor, the third switch S 3 Is connected to the drive electrode;
the fourth switch S 4 Is connected to the first end of the second energy storing capacitor, the fourth switch S 4 Is connected to a first end of the first energy storage capacitor;
the fifth switch S 5 Is connected to the second end of the second energy storing capacitor, the fifth switch S 5 The second end of the first switch is connected to the ground end GND;
the sixth switch S 6 Is connected to a first terminal of the second energy storing capacitor, the sixth switch S 6 Is connected to the drive electrode;
the seventh switch S 7 Is connected to the ground terminal GND, the seventh switch S 7 Is connected to the drive electrode;
the second end of the first energy storage capacitor is connected to the ground terminal GND.
5. The touch control driving circuit according to claim 4, wherein only the first switch S is turned on during the first time interval 1 Closing; during the second period, only the second switch S 2 Closing; during the third period, only the third switch S 3 And said fourth switch S 4 Closing; during the fourth period, only the fifth switch S 5 And the sixth switch S 6 Closing; during the fifth period, only the seventh switch S 7 Closing; during the sixth period, only the fifth switch S 5 And said sixth switch S 6 Closing; in the seventh period, only the third switch S 3 And said fourth switch S 4 Closing; during the eighth period, only the second switch S 2 And (5) closing.
6. The touch driving circuit according to any one of claims 1 to 5, wherein when the voltages at the two ends of the first energy storage capacitor and the second energy storage capacitor are both set to a stable value, the magnitude of the first positive voltage is equal to the voltage at the two ends of the first energy storage capacitor;
the amplitude of the second positive voltage is equal to the voltage value at two ends of the first energy storage capacitor minus the voltage value at two ends of the second energy storage capacitor;
the amplitude of the third positive voltage is equal to the voltage value of two ends of the second energy storage capacitor.
7. A touch driving circuit for outputting a driving signal to drive a driving electrode of a touch display device, the touch driving circuit comprising: a voltage generating circuit and a switching circuit; the voltage generating circuit is electrically connected with the switch circuit;
the driving electrodes comprise positive phase driving electrodes and negative phase driving electrodes; the voltage generating circuit comprises a power supply voltage generating circuit and at least one energy storage capacitor; the power supply voltage generating circuit is used for generating power supply voltage; the at least one energy storage capacitor is used for storing the charges released by the driving electrode and transferring the stored charges to the driving electrode;
the switch circuit is used for controlling the voltage generating circuit to periodically output the power supply voltage, the first positive voltage, the second positive voltage, the third positive voltage and the zero voltage;
the first positive voltage, the second positive voltage, and the third positive voltage are voltages provided by the at least one energy storage capacitor, and the supply voltage is higher than the first positive voltage, the first positive voltage is higher than the second positive voltage, the second positive voltage is higher than the third positive voltage, the third positive voltage is higher than the zero voltage;
wherein the at least one energy storage capacitor comprises a third energy storage capacitor; the switching circuit is configured to simultaneously control the positive phase driving electrode to be connected to the power supply voltage generating circuit, the negative phase driving electrode to be connected to a ground terminal GND, the power supply voltage charging the positive phase driving electrode, the negative phase driving electrode discharging the ground terminal GND so that a voltage across the positive driving electrode is equal to the power supply voltage, and a voltage across the negative phase driving electrode is equal to the zero voltage during a first period; controlling the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in series and the positive phase driving electrode and the third energy storage capacitor to be connected in series in an opposite direction during a second period, the positive phase driving electrode charging the negative phase driving electrode through the third energy storage capacitor such that a voltage across the positive phase driving electrode is equal to the first positive voltage and a voltage across the negative phase driving electrode is equal to the third positive voltage; controlling the positive phase drive electrode, the third energy storage capacitor, and the negative phase drive electrode in parallel for a third period of time, the positive phase drive electrode charging the third energy storage capacitor and the negative phase drive electrode such 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; controlling the positive phase driving electrode, the third energy storage capacitor and the negative phase driving electrode to be connected in series and the positive phase driving electrode and the third energy storage capacitor to be connected in series in a positive direction during a fourth period, wherein the positive phase driving electrode charges the negative phase driving electrode through the third energy storage capacitor so that the voltage across the positive phase driving electrode is equal to the third positive voltage and the voltage across the negative phase driving electrode is equal to the first positive voltage; and simultaneously controlling the positive phase driving electrode to be connected to the ground terminal GND, the negative phase driving electrode to be connected to the power supply voltage generating circuit, the positive phase driving electrode to discharge to the ground terminal GND, the power supply voltage to charge the negative phase driving electrode, so that the voltage across the positive phase driving electrode is equal to the zero voltage, and the voltage across the negative phase driving electrode is equal to the power supply voltage.
8. The touch control driving circuit according to claim 7, wherein the switching circuit is further configured to control the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in series and the positive phase driving electrode to be connected in series with the third energy storage capacitor in a positive direction during a sixth period, and the negative phase driving electrode charges the positive phase driving electrode through the third energy storage capacitor so that a voltage across the negative phase driving electrode is equal to a fourth positive voltage and a voltage across the positive phase driving electrode is equal to a fifth positive voltage; controlling the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in parallel, the negative phase driving electrode charging the third energy storage capacitor and the positive phase driving electrode, so that a voltage across the positive phase driving electrode is equal to a voltage across the negative phase driving electrode and is equal to the second positive voltage, in a seventh period; and controlling the positive phase driving electrode, the third energy storage capacitor, and the negative phase driving electrode to be connected in series and to be connected in series in reverse with the third energy storage capacitor in an eighth period, the negative phase driving electrode charging the positive phase driving electrode through the third energy storage capacitor so that the voltage across the positive phase driving electrode is equal to the fourth positive voltage and the voltage across the negative phase driving electrode is equal to the fifth positive voltage;
the fourth positive voltage is higher than the fifth positive voltage and lower than the power supply voltage.
9. The touch driving circuit according to claim 8, wherein the switch circuit further comprises a sixth switch circuit, a seventh switch circuit, an eighth switch circuit, a ninth switch circuit, and a tenth switch circuit;
during the first period, the sixth switching circuit is turned on; during the second period, the seventh switching circuit is turned on; during the third period, the eighth switching circuit is turned on; in the fourth period, the ninth switching circuit is turned on; during the fifth period, the tenth switching circuit is turned on; in the sixth period, the ninth switching circuit is turned on; during the seventh period, the eighth switching circuit is turned on; in the eighth period, the seventh switching circuit is turned on;
and when any one of the switch circuits is switched on, the other four switch circuits are switched off.
10. The touch driving circuit of claim 9, wherein the sixth switching circuit further comprises an eighth switch S 8 And a ninth switch S 9 (ii) a The seventh switching circuit further comprises a tenth switch S 10 And an eleventh switch S 11 (ii) a The eighth switching circuit further comprises a twelfth switch S 12 And a thirteenth switch S 13 And a fourteenth switch S 14 (ii) a The ninth switching circuit further comprises a fifteenth switch S 15 And a sixteenth switch S 16 (ii) a The tenth switching circuit further includes a seventeenth switch S 17 And an eighteenth switch S 18 ；
The eighth switch S 8 Is connected to the supply voltage generating circuit, the eighth switch S 8 Is connected to the positive phase driving electrode;
the ninth switch S 9 Is connected to the ground terminal GND, the ninth switch S 9 Is connected to the negative phase drive electrode;
the tenth switch S 10 Is connected to the first end of the third energy storing capacitor, the tenth switch S 10 Is connected to the positive phase driving electrode;
the eleventh switch S 11 Is connected to the second terminal of the third energy storage capacitor, the eleventh switch S 11 Is connected to the negative phase drive electrode;
the twelfth switch S 12 Is connected to the first end of the third energy storage capacitor, the twelfth switch S 12 Is connected to the positive phase driving electrode;
the thirteenth switch S 13 Is connected to the third terminalA first terminal of the energy storage capacitor, the thirteenth switch S 13 Is connected to the negative phase drive electrode;
the fourteenth switch S 14 Is connected to the second end of the third energy storage capacitor, and the fourteenth switch S 14 Is connected to the ground terminal GND;
the fifteenth switch S 15 Is connected to the second end of the third energy storage capacitor, and the fifteenth switch S 15 Is connected to the positive phase driving electrode;
the sixteenth switch S 16 Is connected to the first end of the third energy storage capacitor, and the sixteenth switch S 16 Is connected to the negative phase drive electrode;
the seventeenth switch S 17 Is connected to the ground terminal GND, the seventeenth switch S 17 Is connected to the positive phase driving electrode;
the eighteenth switch S 18 Is connected to the supply voltage generating circuit, the eighteenth switch S 18 Is connected to the negative phase drive electrode.
11. The touch control driving circuit according to claim 10, wherein only the eighth switch S is turned on during the first time interval 8 And said ninth switch S 9 Closing at the same time; during the second period, only the tenth switch S 10 And said eleventh switch S 11 Closing; during the third period, only the twelfth switch S 12 The thirteenth switch S 13 And the fourteenth switch S 14 Closing; during the fourth period, only the fifteenth switch S 15 And the sixteenth switch S 16 Closing; during the fifth period, only the seventeenth switch S 17 And said eighteenth switch S 18 Closing; during the sixth period, only the fifteenth switch S 15 And the sixteenth switch S 16 Closing; during the seventh period, only the firstTwelve switches S 12 The thirteenth switch S 13 And the fourteenth switch S 14 Closing; during the eighth period, only the tenth switch S 10 And said eleventh switch S 11 And (5) closing.
12. The touch control driving circuit according to any one of claims 8 to 11, wherein when the voltage across the third energy storage capacitor is set to a stable value, the magnitude of the first positive voltage minus the magnitude of the third positive voltage is equal to the voltage across the third energy storage capacitor;
the amplitude of the second positive voltage is equal to the voltage value at two ends of the third energy storage capacitor;
the amplitude of the fourth positive voltage minus the amplitude of the fifth positive voltage is equal to the voltage value across the third energy storage capacitor.
13. The touch-drive circuit of claim 12, wherein when the equivalent capacitance value of the positive phase drive electrode is equal to the equivalent capacitance value of the negative phase drive electrode, the fourth positive voltage is equal to the first positive voltage, and the fifth positive voltage is equal to the third positive voltage.
14. A touch driving chip comprising the touch driving circuit according to any one of claims 1 to 13.
15. A touch display device comprising the touch driving chip as claimed in claim 14.
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