TWI870114B - Driving circuit for touch with display and voltage driving method thereof - Google Patents

Abstract

A driving circuit for touch with display. The driving circuit comprises a first capacitor, a selector connected to the first end of the first capacitor, a first switch connected to the second end of the first capacitor, and a controller connected to the selector and the first switch. The first end is selectively coupled to one of a ground terminal and a common electrode voltage generator through a switch. The second end is coupled to a first voltage source through the first switch. During a display period, the controller controls the selector to couple the first end to the ground terminal, and the controller controls the first switch to couple the second end to the first voltage source; During a touch control period, the controller controls the selector to couple the first end to the common electrode voltage generator, and the controller controls the first switch to turn off.

Description

Touch display driving circuit and voltage driving method thereof

The present invention relates to a driving circuit and a voltage driving method thereof; in particular, to a touch display driving circuit and a voltage driving method thereof.

With the development of technology, people have become accustomed to operating electronic devices (such as smart phones) through non-physical buttons such as screens. Therefore, panels with touch and display functions have become mainstream products. In this technical field, integrating the touch module into the display driver chip can effectively reduce the manufacturing cost and make the display panel thinner. In the touch display driver circuit, in order to increase the accuracy of touch sensing and reduce the generation of noise that affects the touch or display effect, the touch display driver circuit must generate a periodic synchronous drive signal to provide it to the touch module of the touch display panel. Provide a better operating environment for the touch module of the touch display panel (for example, reduce the influence of parasitic capacitance), thereby reducing the noise it receives and improving touch accuracy.

1, the same driving signals provided to the touch display panel are, for example, a gate high voltage signal (VGH_M) and a gate low voltage signal (VGL_M). The gate high voltage signal (VGH_M) and the gate low voltage signal (VGL_M) are usually the same or synchronized with the common electrode voltage (VCOM) cycle output to the common electrode. In the prior art, please refer to Figure 2, a linear regulator (LDO) is used to convert an external voltage source (VGH, VGL) to generate a first DC voltage (VGHO) and a second DC voltage (VGLO), and then a switch is used to switch back and forth between a third DC voltage (VGH_ESD) to generate a gate high voltage signal (VGH_M) and a gate low voltage signal (VGL_M). In this prior art, because an additional LDO is required to generate the first DC voltage (VGHO) and the second DC voltage (VGLO), there is extra hardware cost and circuit design area is occupied. In addition, the first DC voltage (VGHO) and the second DC voltage (VGLO) generated by the additional LDO may have errors due to differences between the LDOs or within themselves, resulting in slight errors in the voltage of the same drive signal, causing circuit noise.

On the other hand, in the prior art, the common electrode voltage (VCOM) is generated based on a first reference voltage (VREF_P) and a second reference voltage (VREF_N) outside the touch display driving circuit, and is alternately switched by a switch to generate a periodic signal. In this architecture, since the first reference voltage (VREF_P) and the second reference voltage (VREF_N) and the first DC voltage (VGHO) and the second DC voltage (VGLO) generated by the LDO are from different sources, the common electrode voltage (VCOM) and the gate high voltage signal (VGH_M) and the gate low voltage signal (VGL_M) are also prone to differences, which affects the same drive signal and increases the noise in the circuit environment.

From the above, we can see that in the generation of synchronous drive signals, there are still many problems that need to be overcome and solved in the previous technology.

Therefore, the present invention proposes a touch display driving circuit and a voltage driving method to effectively solve the problems encountered by the prior art.

More specifically, one of the purposes of the present invention is to provide a touch display driving circuit and voltage driving method that does not require an additional LDO.

One of the purposes of the present invention is to provide a touch display driving circuit and a voltage driving method that can reduce the error of the same driving signal caused by differences in signal sources.

According to a preferred specific embodiment of the present invention, a driving circuit for touch and display integration is provided. The driving circuit includes a first capacitor, a switch, a first switch and a controller. The switch is coupled to the first end of the first capacitor, wherein the first end is selectively coupled to one of the ground end and the common electrode voltage generator through the switch. The first switch is coupled to the second end of the first capacitor, and the second end is coupled to the first voltage source through the first switch. The controller is coupled to the switch and the first switch. During the display period, the controller controls the switch to couple the first end to the ground end, and the controller controls the first switch to couple the second end to the first voltage source; during the touch period, the controller controls the switch to couple the first end to the common electrode voltage generator, and the controller controls the first switch to be disconnected.

In one embodiment, the first voltage signal at the second end is provided to a gate driver, and the gate driver outputs a gate control signal to the touch display panel according to the first voltage signal.

In one embodiment, during the display period, the first voltage signal is equal to the voltage of the first voltage source; during the touch period, the first voltage signal is equal to the voltage of the first voltage source plus the common electrode voltage.

In one embodiment, the driving circuit further includes a second capacitor and a second switch. The third end of the second capacitor is coupled to the switch. The fourth end of the second capacitor is coupled to the second voltage source via the second switch. The controller is also coupled to the second switch. During the display period, the controller controls the switch so that the third end is coupled to the ground end, and the controller controls the second switch so that the fourth end is coupled to the second voltage source; during the touch period, the controller controls the switch so that the third end is coupled to the common electrode voltage generator, and the controller controls the second switch to be disconnected.

In one embodiment, the first voltage signal at the second end and the second voltage signal at the fourth end are output to the gate driver, and the gate driver outputs a gate control signal to the touch display panel according to the first voltage signal or the second voltage signal.

Another preferred embodiment of the present invention is a voltage-driven method for a touch and display integrated drive circuit. The voltage-driven method includes: setting a first capacitor; providing a first voltage signal at the second end of the first capacitor to a gate driver; and the gate driver outputting a gate control signal to a touch display panel according to the first voltage signal. The setting of the first voltage signal is based on: during the display period, the first end of the first capacitor is coupled to the ground end, and the second end is coupled to the first voltage source; during the touch period, the first end is coupled to the common electrode voltage generator, and the second end is not coupled to the first voltage source.

In one embodiment, the voltage driving method further includes: setting a second capacitor; providing a second voltage signal at the fourth end of the second capacitor to the gate driver; and the gate driver also outputs a gate control signal to the touch display panel according to the second voltage signal. The setting of the second voltage signal is based on: during the display period, the third end of the second capacitor is coupled to the ground end, and the fourth end is coupled to the second voltage source; during the touch period, the third end is coupled to the common electrode voltage generator, and the fourth end is not coupled to the second voltage source.

In one embodiment, during the display period, the first voltage signal is equal to the voltage of the first voltage source; during the touch period, the first voltage signal is equal to the voltage of the first voltage source plus the common electrode voltage.

According to the above-mentioned touch display driving circuit and voltage driving method, the common electrode voltage and the first voltage source and/or the second voltage source generate a common driving signal by means of capacitive coupling. Compared with the prior art, the driving circuit and voltage driving method of the present invention only use one switch to switch between the display period and the touch period. Because it is through the capacitive coupling method, the LDO circuit area can be omitted, and because the common electrode voltage is coupled with the first voltage source and/or the second voltage source, a common driving signal with the same frequency or phase can be generated to reduce the error of the common driving signal caused by the difference in signal sources.

Any reference to elements using names such as "first", "second", etc. in this document does not generally limit the number or order of these elements. Instead, these names are used in this document as a convenient way to distinguish between two or more elements or instances of elements. Therefore, it should be understood that the names "first", "second", etc. in the claim do not necessarily correspond to the same names in the written description. In addition, it should be understood that the reference to the first and second elements does not mean that only two elements can be used or that the first element must be before the second element. "Including", "including", "having", "containing", etc. used in this document are all open terms, which means including but not limited to.

The term "coupled" is used herein to refer to direct or indirect electrical coupling between two structures. For example, in one example of indirect electrical coupling, one structure can be coupled to another structure via a passive element such as a resistor, capacitor, or inductor.

In the present invention, the words "exemplary" and "for example" are used to mean "used as an example, instance or illustration". Any implementation or aspect described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other aspects of the present invention. The terms "approximately" and "substantially" as used herein with respect to a specified value or characteristic are intended to mean within a certain value (for example, 10%) of the specified value or characteristic.

According to one specific embodiment of the present invention, a driving circuit for touch and display integration is provided. The driving circuit includes a first capacitor, a switch, a first switch and a controller. The switch is coupled to the first end of the first capacitor, wherein the first end is selectively coupled to one of a ground terminal and a common electrode voltage generator through the switch. The first switch is coupled to the second end of the first capacitor, and the second end is coupled to a first voltage source through the first switch. The controller is coupled to the switch and the first switch. During the display period, the controller controls the switch so that the first end is coupled to the ground terminal, and the controller controls the first switch so that the second end is coupled to the first voltage source; during the touch period, the controller controls the switch so that the first end is coupled to the common electrode voltage generator, and the controller controls the first switch to be disconnected. By generating the same-drive signal by means of capacitive coupling, the circuit area required for adding an external LDO in the previous technology can be omitted. And the same-drive signal with the same frequency or phase can be generated to reduce the error of the same-drive signal caused by the difference in signal source.

Please refer to FIG. 4, which shows a schematic diagram of the touch display driver circuit 10 of the present invention. The driver circuit 10 includes a first capacitor (C1), a switch 11, a first switch (S1), and a controller 12. The switch 11 is coupled to the first end (E1) of the first capacitor (C1), wherein the first end (E1) is selectively coupled to one of the ground end (GND) and the common electrode voltage generator (COM) through the switch 11. The first switch (S1) is coupled to the second end (E2) of the first capacitor (C1), and the second end (E2) is coupled to the first voltage source (VGH) through the first switch (S1). The controller 12 is coupled to the switch 11 and the first switch (S1).

Specifically, the switch 11 is a component such as a multiplexer or a selector that selects one of the outputs from multiple inputs. The first switch (S1) can be, for example, a transistor switch or other circuit switching component. The switch 11 and the first switch (S1) can be controlled by the controller 12. The controller 12 can provide the control signals (CS1, CS2) required by the switch 11 and the first switch (S1) (for example, a digital signal or a gate start signal). It should be noted that the switch 11 and the first switch (S1) can be controlled by the same or different controllers 12, but a single controller is preferred to reduce the problem of asynchronous operation between multiple controllers. On the other hand, the first capacitor (C1) can be any conventional capacitor, and the capacitance value of the first capacitor (C1) can be determined according to the impedance of the back-end circuit 20 coupled to the touch display driving circuit 10 and/or the signal frequency required by the back-end circuit. The present invention does not limit the capacitance value range of the first capacitor (C1).

In one embodiment, the first voltage signal (VGH_M) of the second end (E2) is provided to the gate driver 20, and the gate driver 20 outputs the gate control signal (VGA) to the touch display panel 30 according to the first voltage signal (VGH_M).

Please refer to FIG. 5A , which illustrates the connection relationship of the touch display driver circuit 10 during the display period. During the display period, the controller 12 of the touch display driver circuit 10 controls the switch 11 so that the first end (E1) is coupled to the ground end (GND), and the controller 12 controls the first switch (S1) so that the second end (E2) is coupled to the first voltage source (VGH). Specifically, when the switch 11 is a two-to-one multiplexer, for example, the controller 12 can provide the control signal CS1 (for example, digital "0") for the switch 11 to switch to the ground end (GND), so that the first end (E1) of the first capacitor (C1) is coupled to the ground end (GND). On the other hand, when, for example, the first switch (S1) is a transistor switch (e.g., MOSFET), the controller 12 can provide a control signal CS2 to conduct the drain (Drain) and the source (Source) of the transistor switch. In this way, the first capacitor (C1) can be coupled to the first voltage source (VGH). It should be noted that the first voltage source (VGH) is a stable voltage source provided outside the touch display driver circuit 10. After regulation by the controller 12, the first voltage source (VGH), the first capacitor (C1) and the ground terminal (GND) form a charging loop to charge the first capacitor (C1). At this time, the second end (E2) of the first capacitor (C1) is coupled to the back-end circuit (e.g., the gate driver 20) as an output end, and the first voltage signal (VGH_M) provided by the second end (E2) of the first capacitor (C1) will be equal to the voltage value of the first voltage source (VGH).

On the other hand, please refer to FIG. 5B , which illustrates the connection relationship of the touch display driving circuit 10 during the touch period. During the touch period, the controller 12 provides a control signal CS1 to control the switch 11 so that the first end (E1) is coupled to the common electrode voltage generator (COM), and the controller 12 provides a control signal CS2 to control the first switch (S1) to be disconnected. Similar to the control during the display period, the controller 12 provides the control signal CS1 (for example, digital "1") required by the switch 11 so that the first end (E1) of the first capacitor (C1) is coupled to the common electrode voltage generator (COM). It should be noted that during the touch period, the common electrode voltage generator (COM) can provide a common electrode voltage (VCOM). In addition, the controller 12 opens the first switch (S1) (i.e., the drain (Drain) and the source (Source) are not conducting), so that the second end (E2) of the first capacitor (C1) and the first voltage source (VGH) are open and not coupled to each other. At this time, the common electrode voltage generator (COM), the first capacitor (C1) and the back-end circuit form a coupling loop. The common electrode voltage (VCOM) is coupled through the first capacitor (C1) and output to the back-end circuit. During the display period, the first capacitor (C1) is in a charging state, and the voltage after charging can be equal to or close to the first voltage source (VGH). Therefore, the first voltage signal (VGH_M) provided by the second end (E2) of the first capacitor (C1) will be equal to the voltage value of the first voltage source (VGH) plus the common electrode voltage (VCOM).

Accordingly, the first voltage signal (VGH_M) provided by the second end (E2) will change with the display period and the touch period. Please refer to Figure 5C. Figure 5C illustrates the relationship between the first voltage signal (VGH_M) and (VCOM) provided by the second end (E2) of the first capacitor (C1) during the display period (DP) and the touch period (TP). It can be seen from Figure 5C that during the display period (DP), the first voltage signal (VGH_M) is in a DC state and the voltage value will be equal to or close to the first voltage source (VGH). During the touch period (TP), the first voltage signal (VGH_M) is a periodic signal with the same frequency and phase as the common electrode voltage (VCOM), and the voltage value of the first voltage signal (VGH_M) will be equal to or close to the voltage value of the first voltage source (VGH) plus the common electrode voltage (VCOM). By generating the same-drive signal by capacitive coupling, the circuit area required for the external LDO in the previous technology can be omitted. And the same-drive signals with the same frequency or phase can be generated to reduce the error of the same-drive signal caused by the difference in signal sources.

It should be noted that the voltage value of the first voltage signal (VGH_M) is not limited in the above embodiment. For example, when the gate driver coupled to the second end (E2) of the first capacitor (C1) needs to drive an N-type transistor and needs a gate high voltage signal (VGH_M) for regulation, the first voltage source (VGH) can be a high voltage corresponding to the gate high voltage signal (VGH_M). Similarly, when the gate driver coupled to the second end (E2) of the first capacitor (C1) needs to drive the P-type transistor and needs a gate low voltage signal (VGL_M) for regulation, the first voltage source (VGH) can be a low voltage corresponding to the gate low voltage signal (VGL_M). However, the conditions for selecting the first voltage source (VGH) should not be limited to the above examples. Generally, those skilled in the art can adjust the selection of the first voltage source (VGH) according to the actual needs of the circuit.

In one embodiment, the touch display driver circuit 10 can provide a gate high voltage signal (VGH_M) and a gate low voltage signal (VGL_M) simultaneously. Referring to FIG. 6 , the driver circuit 10 further includes a second capacitor (C2) and a second switch (S2). The third end (E3) of the second capacitor (C2) is coupled to the switch 11. The fourth end (E4) of the second capacitor (C2) is coupled to the second voltage source (VGL) via the second switch (S2). The controller 12 is also coupled to the second switch (S2). During the display period, the controller 12 controls the switch 11 so that the third terminal (E3) is coupled to the ground terminal (GND), and the controller 12 controls the second switch (S2) so that the fourth terminal (E4) is coupled to the second voltage source (VGL); during the touch period, the controller 12 controls the switch 11 so that the third terminal (E3) is coupled to the common electrode voltage generator (COM), and the controller 12 controls the second switch (S2) to be disconnected.

Compared to the embodiment shown in FIG. 4 , the driving circuit 10 shown in FIG. 6 further has a second capacitor (C2) corresponding to the second voltage source (VGL). And as shown in FIG. 7A , during the display period, the controller 12 can control the second switch (S2) and the switch 11 with a control signal (CS3) to form a charging loop for the second capacitor (C2), and charge the second capacitor (C2) with the second voltage source (VGL). As shown in FIG. 7B , during the touch period, the controller 12 can control the second switch (S2) and the switch 11 to form a coupling loop for the second capacitor (C2). Thus, a second voltage signal (VGL_M) is output.

FIG7C illustrates the relationship between the first voltage signal (VGH_M), the second voltage signal (VGL_M) and the common electrode voltage (VCOM) during the display period and the touch period. As can be seen from FIG7C, during the display period, the first voltage signal (VGH_M) is in a DC state and the voltage value will be equal to or close to the first voltage source (VGH), and the second voltage signal (VGL_M) is in a DC state and the voltage value will be equal to or close to the second voltage source (VGL). During the touch period, similar to the first voltage signal (VGH_M), the second voltage signal (VGL_M) is a periodic signal with the same frequency and phase as the common electrode voltage (VCOM), and the voltage value of the second voltage signal (VGL_M) will be equal to or close to the voltage value of the second voltage source (VGL) plus the common electrode voltage (VCOM). In addition to the above, the circuit area required for adding an LDO as in the prior art can be omitted and the advantages of generating the same drive signal with the same frequency or phase can be obtained. This embodiment can also provide a gate high voltage signal (VGH_M) and a gate low voltage signal (VGL_M) at the same time, so it can be applied to more models of gate drivers and touch display panels. In addition, the gate high voltage signal (VGH_M) and the gate low voltage signal (VGL_M) can be completely synchronized with the common electrode voltage (VCOM). This reduces the problem of poor synchronous drive signals caused by component errors.

It should be noted that in this embodiment, the switch 11, the first switch (S1) and/or the second switch (S2) can be controlled by the same or different controllers 12, and the present invention does not limit the number and type of the controller 12. In addition, the second capacitor (C2) can also be optionally coupled to the ground terminal (GND) or the common electrode voltage generator (COM) through a switch 11 different from the first capacitor (C1). On the other hand, the first voltage source (VGH) and the second voltage source (VGL) can correspond to the gate high voltage signal (VGH_M) and the gate low voltage signal (VGL_M), respectively, but not limited to this. Generally, those skilled in the art can adjust the selection of the first voltage source (VGH) and/or the second voltage source (VGL) according to the actual needs of the circuit. In addition, in this embodiment, the drawing position and direction of the first voltage source (VGH) and the second voltage source (VGL) are just examples, and are not intended to limit the size, positive or negative, or relative relationship of the first voltage source (VGH) and the second voltage source (VGL).

Another preferred embodiment of the present invention is a voltage-driven method for a touch and display integrated driver circuit. Specifically, please refer to FIG. 8A , which is a flow chart of the voltage-driven method for a touch and display integrated driver circuit. The voltage-driven method includes: (step S1-1) setting a first capacitor; (step S1-2) providing a first voltage signal at the second end of the first capacitor to a gate driver. The setting of the first voltage signal is based on: during the display period, the first end of the first capacitor is coupled to the ground end, and the second end is coupled to the first voltage source; during the touch period, the first end is coupled to the common electrode voltage generator, and the second end is not coupled to the first voltage source. And (step S1-3) the gate driver outputs a gate control signal to the touch display panel according to the first voltage signal.

The voltage driving method provided by the present invention can generate a common driving signal by setting a capacitor to couple the common electrode voltage. Compared with the prior art, the circuit area required by the LDO in the driving circuit in the prior art can be omitted. And the same driving signal with the same frequency or phase can be generated to reduce the error of the same driving signal caused by the difference in signal source.

In one embodiment, FIG. 8B is a flow chart of another embodiment of the voltage-driven method. The voltage-driven method further includes: (step S2-1) setting a second capacitor; (step S2-2) providing a second voltage signal at the fourth end of the second capacitor to the gate driver. The second voltage signal is set based on: during the display period, the third end of the second capacitor is coupled to the ground end, and the fourth end is coupled to the second voltage source; during the touch period, the third end is coupled to the common electrode voltage generator, and the fourth end is not coupled to the second voltage source. And (step S2-3) the gate driver also outputs a gate control signal to the touch display panel according to the second voltage signal.

Compared with the prior art, a common electrode voltage is coupled by setting a capacitor to generate a common drive signal. Compared with the prior art, the circuit area required for the LDO in the driving circuit in the prior art can be omitted. And common drive signals with the same frequency or phase can be generated to reduce the error of the common drive signal caused by the difference in signal sources. And because the first capacitor and the second capacitor are provided at the same time, a gate high voltage signal and a gate low voltage signal can be provided at the same time, so it can be applied to more models of gate drivers and touch display panels. And the gate high voltage signal and the gate low voltage signal can be completely synchronized with the common electrode voltage. Reduce the problem of poor synchronous drive signal caused by component errors.

The previous description of the invention is provided to enable one of ordinary skill in the art to make or implement the invention. Various modifications of the invention will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations or the embodiments may be combined with one another or implemented separately without departing from the spirit or scope of the invention. Therefore, the invention is not intended to be limited to the examples described herein, but to be accorded the widest scope consistent with the principles and novel features of the invention herein.

10: Touch display driver circuit/driver circuit

11: Switcher

12: Controller

20: Gate driver/back-end circuit

30: Touch display panel

C1: First capacitor

C2: Second capacitor

COM: Common electrode voltage generator

CS1, CS2, CS3: control signal

DP: Display period

TP: Touch period

E1: First end

E2: Second end

E3: The third end

E4: The fourth end

GND: Ground terminal

VGH: First voltage source

VGH_M: first voltage signal/gate high voltage signal

VGL: Second voltage source

VGL_M: Second voltage signal/gate low voltage signal

VCOM: common electrode voltage

VGA: Gate control signal

S1: First switch

S2: Second switch

The drawings presented in the present invention are intended to help describe the various embodiments of the present invention. However, in order to simplify the drawings and/or highlight the contents to be presented in the drawings, the known structures and/or elements in the drawings may be drawn in a simple schematic manner or presented in an omitted manner. On the other hand, the number of elements in the drawings may be singular or plural. The drawings presented in the present invention are only for explaining these embodiments and are not intended to limit them.

Figure 1 shows a waveform diagram of the same-drive signal in the prior art.

FIG2 shows a circuit diagram for generating a gate high voltage signal and a gate low voltage signal in the prior art.

Figure 3 shows a circuit diagram for generating common electrode voltage in the prior art.

FIG4 is a schematic diagram of a driver circuit for integrating touch control and display in one embodiment of the present invention.

FIG5A is a schematic diagram showing the circuit operation of the driving circuit during the display period in one embodiment of the present invention.

FIG5B is a schematic diagram showing the circuit operation of the driving circuit during the touch control period in one embodiment of the present invention.

FIG5C shows a waveform diagram of the driving circuit during the display period and the touch period in an embodiment of the present invention.

FIG6 is a schematic diagram of a driver circuit for integrating touch control and display in one embodiment of the present invention.

FIG. 7A is a schematic diagram showing the circuit operation of the driving circuit during the display period in one embodiment of the present invention.

FIG. 7B is a schematic diagram showing the circuit operation of the driving circuit during the touch control period in one embodiment of the present invention.

FIG. 7C shows a waveform diagram of the driving circuit during the display period and the touch period in an embodiment of the present invention.

Figures 8A and 8B are flow charts of a voltage-driven method in one embodiment of the present invention.

10: Touch display driver circuit/driver circuit

11: Switcher

12: Controller

20: Gate driver/back-end circuit

30: Touch display panel

C1: First capacitor

COM: Common electrode voltage generator

CS1, CS2: control signal

E1: First end

E2: Second end

GND: Ground terminal

VGH: First voltage source

VGH_M: first voltage signal/gate high voltage signal

VCOM: common electrode voltage

VGA: Gate control signal

S1: First switch

Claims (8)

A driving circuit for touch and display integration, comprising: a first capacitor; a switch coupled to a first end of the first capacitor, wherein the first end is selectively coupled to one of a ground end and a common electrode voltage generator through the switch; a first switch coupled to a second end of the first capacitor, wherein the second end is coupled to a first voltage source through the first switch; and a controller coupled to the switch and the first switch; during a display period, the controller controls the switch to couple the first end to the ground end, and the controller controls the first switch to couple the second end to the first voltage source; during a touch period, the controller controls the switch to couple the first end to the common electrode voltage generator, and the controller controls the first switch to be disconnected. The driving circuit as described in claim 1, wherein a first voltage signal at the second end is used to provide a gate driver, and the gate driver outputs a gate control signal to a touch display panel according to the first voltage signal. A driving circuit as described in claim 2, wherein during the display period, the first voltage signal is equal to the voltage of the first voltage source; during the touch period, the first voltage signal is equal to the voltage of the first voltage source plus a common electrode voltage. The driving circuit as described in claim 1 further comprises: a second capacitor, a third end of which is coupled to the switch; and a second switch, a fourth end of which is coupled to a second voltage source via the second switch; wherein the controller is also coupled to the second switch; during the display period, the controller controls the switch so that the third end is coupled to the ground end, and the controller controls the second switch so that the fourth end is coupled to the second voltage source; during the touch period, the controller controls the switch so that the third end is coupled to the common electrode voltage generator, and the controller controls the second switch to be disconnected. A driving circuit as described in claim 4, wherein a first voltage signal at the second end and a second voltage signal at the fourth end are output to a gate driver, and the gate driver outputs a gate control signal to a touch display panel according to the first voltage signal or the second voltage signal. A voltage driving method for a touch and display integrated driving circuit, comprising: Setting a first capacitor; Providing a first voltage signal at a second end of the first capacitor to a gate driver; and The gate driver outputs a gate control signal to a touch display panel according to the first voltage signal; Wherein the setting of the first voltage signal is based on: During a display period, a first end of the first capacitor is coupled to a ground end, and the second end is coupled to a first voltage source; During a touch period, the first end is coupled to a common electrode voltage generator, and the second end is not coupled to the first voltage source. The voltage-driven method as described in claim 6 further comprises: providing a second capacitor; providing a second voltage signal at a fourth terminal of the second capacitor to the gate driver; and the gate driver also outputs the gate control signal to the touch display panel according to the second voltage signal; wherein the setting of the second voltage signal is based on: during the display period, coupling a third terminal of the second capacitor to the ground terminal, and coupling the fourth terminal to a second voltage source; during the touch period, coupling the third terminal to the common electrode voltage generator, and not coupling the fourth terminal to the second voltage source. A voltage-driven method as described in claim 6, wherein during the display period, the first voltage signal is equal to the voltage of the first voltage source; during the touch period, the first voltage signal is equal to the voltage of the first voltage source plus a common electrode voltage.

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