Touch display driving circuit and voltage driving method thereof

Abstract

The invention provides a driving circuit for touch control and display integration and a voltage driving method thereof. The driving circuit includes a first capacitor, a switcher coupled to a first end of the first capacitor, a first switch coupled to a second end of the first capacitor, and a controller coupled to the switcher and the first switch. The first terminal is selectively coupled to one of the ground terminal and the common electrode voltage generator via the switcher. The second end is coupled to the first voltage source through the first switch. During a display period, the controller controls the switcher so that the first terminal is coupled to a ground terminal, and the controller controls the first switch so that the second terminal is coupled to a first voltage source. During a touch control period, the controller controls the switcher so that the first end is coupled to the common electrode voltage generator, and the controller controls the first switch to be turned off.

Description

Technical Field

[0001] 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. Background Art

[0002] With the development of technology, people have been accustomed to operating electronic devices (such as smartphones) through non-physical buttons such as screens. Therefore, panels with touch and display functions have become mainstream products. In this technical field, integrating a touch module into a display driving chip can effectively reduce manufacturing costs and make the display panel thinner and lighter. In a touch display driving circuit, in order to increase the accuracy of touch sensing and reduce noise generation that affects the touch or display effect, the touch display driving circuit must generate a periodic common driving signal and provide it to the touch module of the touch display panel. To enable the touch module of the touch display panel to have a better operating environment (for example, reducing the influence of parasitic capacitance) when working, thereby reducing the noise received by it and improving touch accuracy.

[0003] Please refer to Figure 1 , the common 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 in period or synchronous with the common electrode voltage (VCOM) output to the common electrode. In the prior art, please refer to Figure 2 , a linear voltage 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) of direct current, and then switch back and forth between a third DC voltage (VGH_ESD) through a switch, thereby generating 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 are additional hardware costs and it occupies circuit design area. 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 or within the LDOs, resulting in some errors in the voltage of the common driving signal and causing circuit noise.

[0004] On the other hand, in the prior art, the common electrode voltage (VCOM) is generated based on the first reference voltage (VREF_P) and the second reference voltage (VREF_N) outside the touch display driving circuit, and is switched alternately 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.

[0005] It can be seen from the above that in the generation of the co-drive signal, there are still many problems in the prior art that need to be overcome and solved. Summary of the invention

[0006] Therefore, the present invention proposes a touch display driving circuit and a voltage driving method to effectively solve the problems encountered in the prior art.

[0007] More specifically, one of the objectives of the present invention is to provide a touch display driving circuit and a voltage driving method without an additional LDO.

[0008] One of the objectives of the present invention is to provide a touch display driving circuit and a voltage driving method for reducing the error of the same driving signal caused by the difference in signal sources.

[0009] According to a preferred specific embodiment of the present invention, there is a driving circuit for integrating touch and display. 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 optionally coupled to the ground end and one of the common electrode voltage generator via 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 via 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 end, 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.

[0010] 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.

[0011] 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.

[0012] In one embodiment, the driving circuit further includes a second capacitor and a second switch. The third terminal of the second capacitor is coupled to the switch. The fourth terminal 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 terminal is coupled to the ground terminal, and the controller controls the second switch so that the fourth terminal is coupled to the second voltage source; during the touch period, the controller controls the switch so that the third terminal is coupled to the common electrode voltage generator, and the controller controls the second switch to be disconnected.

[0013] 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.

[0014] Another preferred embodiment of the present invention is a voltage driving method for a touch and display integrated driving circuit. The voltage driving 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.

[0015] 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 further outputting a gate control signal to the touch display panel according to the second voltage signal. 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.

[0016] 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.

[0017] 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 the same 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 capacitive coupling, the circuit area of ​​LDO can be saved, and because the common electrode voltage is coupled with the first voltage source and / or the second voltage source, the same driving signal with the same frequency or phase can be generated to reduce the error caused by the difference in signal sources of the same driving signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings presented in this disclosure are intended to help describe various embodiments of the present invention. However, in order to simplify the drawings and / or highlight the content to be presented in the drawings, the existing 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 this disclosure are only intended to illustrate these embodiments and are not intended to limit them.

[0019] Figure 1 It is a waveform diagram of the same drive signal in the prior art.

[0020] Figure 2 The present invention is a circuit diagram for generating a gate high voltage signal and a gate low voltage signal in the prior art.

[0021] Figure 3 The present invention is a circuit diagram for generating a common electrode voltage in the prior art.

[0022] Figure 4 FIG. 4 is a schematic diagram of a driving circuit for integrating touch control and display in one embodiment of the present invention.

[0023] Figure 5A FIG. 4 is a schematic diagram of the circuit operation of the driving circuit during the display period in one embodiment of the present invention.

[0024] Figure 5B FIG. 4 is a schematic diagram of the circuit operation of the driving circuit during the touch control period in one embodiment of the present invention.

[0025] Figure 5C FIG. 1 is a waveform diagram of a driving circuit during a display period and a touch period in an embodiment of the present invention.

[0026] Figure 6 FIG. 4 is a schematic diagram of a driving circuit for integrating touch control and display in one embodiment of the present invention.

[0027] Fig. 7A FIG. 4 is a schematic diagram of the circuit operation of the driving circuit during the display period in one embodiment of the present invention.

[0028] Figure 7B FIG. 4 is a schematic diagram of the circuit operation of the driving circuit during the touch control period in one embodiment of the present invention.

[0029] Figure 7C FIG. 1 is a waveform diagram of a driving circuit in a display period and a touch period in an embodiment of the present invention.

[0030] Fig. 8A and Figure 8B FIG. 4 is a flow chart of a voltage driving method in one embodiment of the present invention. Description of main component symbols:

[0031] 10Touch display drive circuit / drive circuit

[0032] 11Switcher

[0033] 12 Controllers

[0034] 20Gate driver / backend circuit

[0035] 30 Touch display panel

[0036] C1 first capacitor

[0037] C2 Second capacitor

[0038] COM common electrode voltage generator

[0039] CS1, CS2, CS3 control signals

[0040] DP display period

[0041] TP touch period

[0042] E1 first end

[0043] E2 Second Terminal

[0044] E3 Third Terminal

[0045] E4 Fourth End

[0046] GND ground terminal

[0047] VGH first voltage source

[0048] VGH_M first voltage signal / gate high voltage signal

[0049] VGLSecond voltage source

[0050] VGL_M second voltage signal / gate low voltage signal

[0051] VCOM common electrode voltage

[0052] VGA gate control signal

[0053] S1 first switch

[0054] S2 second switch DETAILED DESCRIPTION

[0055] Any reference to elements using names such as "first", "second" and the like in this article does not generally limit the number or order of these elements. On the contrary, these names are used as a convenient way to distinguish two or more elements or element instances in this article. Therefore, it should be understood that the names "first", "second" and the like in the claims 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" and the like used in this article are all open terms, that is, they mean including but not limited to.

[0056] 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 may be coupled to another structure via a passive element such as a resistor, capacitor, or inductor.

[0057] 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.

[0058] According to a specific embodiment of the present invention, a driving circuit for integrating touch control and display 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 optionally coupled to the ground end and one of the common electrode voltage generator via 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 via 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 end, 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. The same drive signal is generated by capacitive coupling, so that the circuit area required for adding an LDO as in the prior art can be omitted. And the same drive signals with the same frequency or phase can be generated to reduce the error caused by the difference in signal sources of the same drive signal.

[0059] Please refer to Figure 4 , Figure 4Schematic diagram of a touch display driving circuit 10 of the present invention. The driving circuit 10 includes a first capacitor (C1), a switch 11, a first switch (S1) and a controller 12. The switch 11 is coupled to a first end (E1) of the first capacitor (C1), wherein the first end (E1) is optionally coupled to one of a ground end (GND) and a common electrode voltage generator (COM) via the switch 11. The first switch (S1) is coupled to a second end (E2) of the first capacitor (C1), wherein the second end (E2) is coupled to a first voltage source (VGH) via the first switch (S1). The controller 12 is coupled to the switch 11 and the first switch (S1).

[0060] Specifically, the switch 11 is, for example, a multiplexer or a selector, which is an element that selects one of the outputs from multiple inputs. The first switch (S1) can be, for example, a transistor switch or other circuit switch element. The switch 11 and the first switch (S1) can be controlled by a 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 preferably a single controller, thereby reducing 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 based on the impedance of the back-end circuit 20 to which the touch display driving circuit 10 is coupled 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).

[0061] 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 a gate control signal (VGA) to the touch display panel 30 according to the first voltage signal (VGH_M).

[0062] Please refer to Figure 5A , Figure 5AThe connection relationship of the touch display driving circuit 10 during the display period is described. During the display period, the controller 12 of the touch display driving 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, for example, the switch 11 is a two-to-one multiplexer, the controller 12 can provide a control signal CS1 (for example, a 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 (for example, a MOSFET), the controller 12 can provide a gate control signal CS2 that turns on 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 driving circuit 10. After being regulated 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 terminal (E2) of the first capacitor (C1) is coupled to the back-end circuit (for example, the gate driver 20) as an output terminal, and the first voltage signal (VGH_M) provided by the second terminal (E2) of the first capacitor (C1) will be equal to the voltage value of the first voltage source (VGH).

[0063] On the other hand, please refer to Figure 5B , Figure 5BThe connection relationship of the touch display driving circuit 10 during the touch period is described. 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 to couple the first end (E1) of the first capacitor (C1) 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 disconnects the first switch (S1) (i.e., the drain (Drain) and the source (Source) are not conductive), so that the second end (E2) of the first capacitor (C1) and the first voltage source (VGH) are disconnected and are not coupled to each other. At this time, the common electrode voltage generator (COM), the first capacitor (C1) and the back-end circuit will 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 charged voltage 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) superimposed on the common electrode voltage (VCOM).

[0064] Accordingly, the first voltage signal (VGH_M) provided by the second terminal (E2) will vary with the display period and the touch period. Figure 5C . Figure 5C The relationship between the first voltage signal (VGH_M) provided by the second end (E2) of the first capacitor (C1) and (VCOM) during the display period (DP) and the touch period (TP) is described. Figure 5C It can be known 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). The same drive signal is generated by capacitive coupling, so the circuit area required for adding an LDO in the prior art can be omitted. And the same drive signals with the same frequency or phase can be generated to reduce the error caused by the difference in signal sources of the same drive signal.

[0065] It should be noted that, in the above embodiments, the voltage value of the first voltage signal (VGH_M) is not limited. 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 a 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, and those skilled in the art can adjust the selection of the first voltage source (VGH) according to the actual needs of the circuit.

[0066] In one embodiment, the touch display driving circuit 10 can provide a gate high voltage signal (VGH_M) and a gate low voltage signal (VGL_M) simultaneously. Figure 6 , the driving 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 end (E3) is coupled to the ground end (GND), and the controller 12 controls the second switch (S2) so that the fourth end (E4) is coupled to the second voltage source (VGL); during the touch period, the controller 12 controls the switch 11 so that the third end (E3) is coupled to the common electrode voltage generator (COM), and the controller 12 controls the second switch (S2) to be disconnected.

[0067] Compared to Figure 4 The embodiment shown, Figure 6 The driving circuit 10 shown also has a second capacitor (C2) corresponding to the second voltage source (VGL). Fig. 7A As shown, during the display period, the controller 12 can use the control signal (CS3) to control the second switch (S2) and the switch 11 to form a charging loop for the second capacitor (C2), and charge the second capacitor (C2) with the second voltage source (VGL). Figure 7B As shown, during the touch control period, the controller 12 can control the second switch (S2) and the switch 11 to form a coupling loop with the second capacitor (C2), thereby outputting a second voltage signal (VGL_M).

[0068] Figure 7CThe 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 is described. Figure 7C It can be known that 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 the external LDO in the prior art and the advantages of being able to generate the same drive signal with the same frequency or phase can be omitted. 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 gate drivers and touch display panels of more models. And 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). Reduce the problem of poor co-drive signals caused by component errors.

[0069] 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 are not limited to this. 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 only 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).

[0070] Another preferred embodiment of the present invention is a voltage driving method for a touch and display integrated driving circuit. Fig. 8A , Fig. 8AA flow chart of a voltage driving method for a touch and display integrated driving circuit. The voltage driving 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.

[0071] 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 for the LDO in the driving circuit in the prior art can be omitted. And the common driving signals with the same frequency or phase can be generated to reduce the error caused by the difference in signal sources of the common driving signals.

[0072] In one embodiment, Figure 8B Flow chart of another embodiment of the voltage driving method. The voltage driving 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 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. And (step S2-3) the gate driver also outputs a gate control signal to the touch display panel according to the second voltage signal.

[0073] Compared with the prior art, a capacitor is set to couple the common electrode voltage 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, the gate high voltage signal and the gate low voltage signal can be provided simultaneously, 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 common drive signals caused by component errors.

[0074] The previous description of the invention is provided to enable those skilled in the art to make or implement the invention. Various modifications to the invention will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations or the various 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 rather to the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A driving circuit for integrating touch control and display, It is characterized in that Include: 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 terminal and a common electrode voltage generator via the switch; a first switch coupled to a second end of the first capacitor, the second end being coupled to a first voltage source via the first switch; as well as a controller coupled to the switch and the first switch; During a display period, the controller controls the switch so that the first end is coupled to the ground end, and the controller controls the first switch so that the second end is coupled 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.

2. The driving circuit for integrating touch control and display as claimed in claim 1, It is characterized in that A first voltage signal at the second end is provided to a gate driver, and the gate driver outputs a gate control signal to a touch display panel according to the first voltage signal.

3. The driving circuit for integrating touch control and display as claimed in claim 2, It is characterized in that 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.

4. The driving circuit for integrating touch control and display as claimed in claim 1, It is characterized in that Also includes: a second capacitor, a third terminal of the second capacitor being coupled to the switch; and a second switch, wherein a fourth terminal of the second capacitor 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 terminal is coupled to the ground terminal, and the controller controls the second switch so that the fourth terminal is coupled to the second voltage source; During the touch period, the controller controls the switch to couple the third terminal to the common electrode voltage generator, and the controller controls the second switch to be disconnected.

5. The driving circuit for integrating touch control and display as claimed in claim 4, It is characterized in that 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.

6. A voltage driving method for a touch and display integrated driving circuit, It is characterized in that Include: Provide 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; The first voltage signal is set based on: During a display period, a first terminal of the first capacitor is coupled to a ground terminal, and a second terminal 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.

7. The voltage driving method for the touch and display integrated driving circuit according to claim 6, It is characterized in that Also includes: Provide 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; The second voltage signal is set based on: During the display period, a third terminal of the second capacitor is coupled to the ground terminal, and the fourth terminal is coupled to a second voltage source; During the touch control period, the third terminal is coupled to the common electrode voltage generator, and the fourth terminal is not coupled to the second voltage source.

8. The voltage driving method for the touch and display integrated driving circuit according to claim 6, It is characterized in that 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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