CN107885368B

CN107885368B - Touch display device and electronic apparatus

Info

Publication number: CN107885368B
Application number: CN201610875163.3A
Authority: CN
Inventors: 林峰
Original assignee: Zhuhai Zhongke Ruibo Medical Technology Co Ltd
Current assignee: Huizhou Xili Technology Co ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2021-06-29
Anticipated expiration: 2036-09-30
Also published as: CN107885368A

Abstract

The invention provides a touch display device and an electronic apparatus. The touch display device comprises a touch display panel, a control chip and a driving chip. The touch display panel includes a plurality of common electrodes. The driving chip is used for driving the touch display panel to display an image and also used for driving the plurality of common electrodes to perform touch sensing. The control chip is used for generating a modulation signal and outputting the modulation signal to the driving chip. When the control chip outputs the modulation signal to the driving chip, the driving chip drives the touch display panel to simultaneously execute image display refreshing and touch sensing, wherein the signals on the touch display panel are all signals synchronously modulated by the modulation signal. The electronic equipment comprises the touch display device.

Description

Touch display device and electronic apparatus

Technical Field

The present invention relates to the field of touch display technologies, and in particular, to a touch display device and an electronic device having the same.

Background

In general, a touch display device includes three types of touch display panels, an out-Cell (On-Cell type), and an In-Cell (In-Cell type or In-Cell type). With the development of technology, In-Cell type touch display panels are gradually becoming a trend In order to further make the touch display panels thinner and to improve the luminance of the touch display panels.

Taking the touch display device as an example of a liquid crystal display device, in general, the liquid crystal display device includes a liquid crystal display panel and a driving circuit for driving the liquid crystal display panel to perform image display and touch sensing. The liquid crystal display panel includes a plurality of scan lines, a plurality of data lines, and a plurality of transistors, a plurality of pixel electrodes, and a plurality of common electrodes. Each transistor includes a gate, a source, and a drain. The grid electrode is connected with a scanning line, the source electrode is connected with a data line, and the drain electrode is connected with a pixel electrode. The driving circuit is used for providing scanning signals to the scanning lines, activating the transistors connected with the scanning lines, providing gray-scale voltage to the pixel electrodes through the data lines and the activated transistors, and providing common voltage to the common electrodes to drive the liquid crystal display panel to execute image display refreshing.

When the driving circuit supplies the scan signal to a scan line, a time interval after a gray scale voltage is transmitted to a row of pixel electrodes connected to the scan line and before the scan signal is supplied to another scan line is referred to as a row interval. In other words, the time gap between the gray scale voltage supplied to one row of pixel electrodes and the gray scale voltage supplied to the other row of pixel electrodes after the gray scale voltage is supplied to the one row of pixel electrodes is the row gap. In addition, the time interval between the driving circuit supplying one frame of gray scale voltage to all the pixel electrodes and supplying the other frame of gray scale voltage to all the pixel electrodes may also be referred to as a frame interval. In the line gap, the frame gap, no transmission of any gradation voltage, that is, no image display refresh, and accordingly, the liquid crystal display panel is entirely in the state of image display hold at this time.

Existing liquid crystal display devices generally employ performing touch sensing on touch sensing electrodes at row gaps. In general, in order to guarantee a duration of touch sensing in cooperation with performing touch sensing, a time of a line gap is generally lengthened. The touch sensing electrode is, for example, a multiplexed common electrode. When the common electrode is multiplexed as a touch sensing electrode, the driving circuit generally supplies a touch driving signal different from the common voltage to the common electrode to perform touch sensing. Generally, the common voltage is a constant voltage signal with respect to a ground signal GND (e.g., 0 v), and the touch driving signal is a periodically varying square wave pulse signal with a predetermined frequency with respect to the ground signal GND, so as to improve the signal-to-noise ratio of the touch sensing signal. It can be seen that the liquid crystal display device performs image display refresh and touch sensing in a time-sharing manner, thereby reducing the mutual influence between image display and touch sensing to some extent.

However, as the resolution of the liquid crystal display device is gradually improved, for example, the resolution of the liquid crystal display device of a mobile phone gradually adopts a 2K (e.g., 2560x1440) resolution and even higher resolution, the display refresh frequency generally adopts 60HZ, the line gap and the frame gap are significantly compressed, and if touch sensing is performed on the touch sensing electrodes only in the line gap and the frame gap, the touch sensing cannot be performed sufficiently due to the obvious insufficient time. When the refresh frequency is increased to 120HZ, less time is available for touch sensing.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention is to provide a touch display device and an electronic apparatus.

The present invention provides a touch display device including:

a touch display panel including a plurality of common electrodes;

the driving chip is used for driving the touch display panel to perform image display and driving the plurality of common electrodes to perform touch sensing; and

the control chip is used for generating a modulation signal and outputting the modulation signal to the driving chip;

when the control chip outputs the modulation signal to the driving chip, the driving chip drives the touch display panel to simultaneously execute image display refreshing and touch sensing, wherein the signals on the touch display panel are all signals synchronously modulated by the modulation signal.

Optionally, when the driving chip drives the touch display panel to simultaneously perform image display refresh and touch sensing, the elements on the touch display panel are either directly driven by the driving chip or indirectly driven by the driving chip.

Optionally, when the control chip outputs the modulation signal to the driving chip, the driving chip correspondingly outputs a signal modulated by the modulation signal to the touch display panel.

Optionally, the driving chip provides the same first common voltage to the plurality of common electrodes, drives the plurality of common electrodes to perform image display, and further drives the common electrodes to perform touch sensing, where the first common voltage is a signal modulated by the modulation signal.

Optionally, the driving chip is configured to drive the plurality of common electrodes to perform self-capacitance touch sensing.

Optionally, the driving chip drives the plurality of common electrodes to perform touch sensing in a time-sharing or simultaneous manner.

Optionally, the plurality of common electrodes are arranged in a two-dimensional array, and when the driving chip drives the plurality of common electrodes in a time-sharing manner to perform touch sensing, the driving chip drives one or more rows of common electrodes to perform touch sensing each time, or drives one or more columns of common electrodes to perform touch sensing each time.

Optionally, the first common voltage is kept constant with respect to the modulation signal.

Optionally, the driving chip simultaneously provides the first common voltage to the plurality of common electrodes, and receives the touch sensing signals output from the plurality of common electrodes in a time-sharing manner to acquire the touch information.

Optionally, the driving chip includes a common voltage generating circuit and a touch driving circuit, the common voltage generating circuit is selectively connectable to the plurality of common electrodes for providing the first common voltage to the plurality of common electrodes to perform image display rather than touch sensing, and the touch driving circuit is selectively connectable to the plurality of common electrodes for providing the first common voltage to the plurality of common electrodes to perform image display and self-capacitance touch sensing.

Optionally, the driving chip further includes a data selection circuit, the data selection circuit is connected to the plurality of common electrodes, the common voltage generation circuit is selectively connected to the plurality of common electrodes through the data selection circuit, and the touch driving circuit is selectively connected to the plurality of common electrodes through the data selection circuit.

Optionally, when the touch driving circuit provides the first common voltage to a part of the common electrodes through the data selection circuit to perform image display and touch sensing, the common voltage generation circuit provides the first common voltage to all or part of the remaining common electrodes to perform image display, wherein the first common voltage provided to the common electrodes by the touch driving circuit and the first common voltage provided to the common electrodes by the common voltage generation circuit are the same signal.

Optionally, the driving chip further includes a control circuit connected to the data selection circuit, the control circuit controls the data selection circuit, and the touch driving circuit is electrically connected to the plurality of common electrodes in a time-sharing manner.

Optionally, the data selection circuit includes a first data selector and a plurality of second data selectors, wherein the common voltage generation circuit is selectively connectable to the plurality of common electrodes through the first data selector, and the touch driving circuit is selectively connectable to the plurality of common electrodes through the plurality of second data selectors, each second data selector being configured to connect to a portion of a common electrode.

Optionally, the first data selector includes a plurality of first output ports, each of the second data selectors includes a plurality of second output ports, each of the second output ports is connected to a common electrode, and each of the first output ports of the first data selector is connected between the second output port and the common electrode.

Optionally, the plurality of first output ports of the first data selector are connected to the plurality of second output ports of each second data selector in a one-to-one correspondence manner, or the plurality of first output ports of the first data selector are connected to a part of the second output ports of the second data selector, or the plurality of first output ports of the first data selector are connected to a part of the plurality of second output ports of the second data selector in a one-to-one correspondence manner.

Optionally, the plurality of common electrodes are arranged in multiple rows and multiple columns, and a plurality of second output ports of a second data selector are respectively connected to the common electrodes in the same column or the same row.

Optionally, the plurality of common electrodes are arranged in multiple rows and multiple columns, the number of the second data selectors is the same as the number of columns of the plurality of common electrodes, the number of the second output ports of each second data selector is the same as the number of rows of the plurality of common electrodes, the second output ports of each second data selector are respectively connected with one column of common electrodes in a one-to-one correspondence manner, or the number of the second data selectors is the same as the number of rows of the plurality of common electrodes, the number of the second output ports of each second data selector is the same as the number of columns of the plurality of common electrodes, and the second output ports of each second data selector are respectively connected with one row of common electrodes in a one-to-one correspondence manner.

Optionally, the driving chip further includes a first ground terminal, the control chip further includes a second ground terminal and a modulation circuit, the modulation circuit is connected between the first ground terminal and the second ground terminal, wherein the second ground terminal is used for being connected to a device ground of an electronic device and receiving a ground signal, and the modulation circuit is used for generating the modulation signal according to the ground signal and a driving signal and outputting the modulation signal to the first ground terminal.

Optionally, the common voltage generating circuit includes:

the signal source comprises a grounding end and an output end, and the grounding end is connected with the first grounding end; and

the follower is connected with the first grounding end, the follower is selectively connected with the plurality of common electrodes through the data selection circuit, and the follower is used for transmitting the signal output by the signal source to the data selection circuit.

Optionally, the touch driving circuit includes:

the signal source; and

and a plurality of operational amplifiers, each of which is connected to the first ground terminal, each of the operational amplifiers being selectively connected to a part of the common electrodes through the data selection circuit, the operational amplifiers being configured to transmit the signal output from the signal source to the data selection circuit and to transmit a touch sensing signal from the common electrodes.

Optionally, the common voltage generating circuit further includes a voltage stabilizing circuit connected between the follower and the first ground terminal, and the voltage stabilizing circuit is configured to stabilize a signal output by the follower.

Optionally, the follower includes a first amplifier, and the first amplifier includes a third power supply terminal, a third ground terminal, a first non-inverting terminal, a first inverting terminal, and a first output terminal, where the third power supply terminal is configured to load a power supply voltage, the third ground terminal is connected to the first ground terminal, the first non-inverting terminal is connected to the output terminal of the signal source, the first inverting terminal is connected to the first output terminal, and the first output terminal is selectively connected to the plurality of common electrodes through a data selection circuit.

Optionally, each operational amplifier comprises a second amplifier and a feedback branch; the second amplifier comprises a fourth power supply end, a fourth grounding end, a second in-phase end, a second inverting end and a second output end, wherein the fourth power supply end is used for loading power supply voltage, the fourth grounding end is connected with the first grounding end, the second in-phase end is connected with the output end of the signal source, the second inverting end is connected with the second output end through a feedback branch, and the second inverting end is selectively connected with part of the common electrodes through a data selection circuit.

Optionally, when the modulation circuit outputs the modulation signal to the first ground terminal, the signal source correspondingly outputs a first reference voltage signal modulated by the modulation signal to the first non-inverting terminal and the second non-inverting terminal, and the operational amplifier and the follower correspondingly output a first common voltage, which is the same as the first reference voltage signal, to the plurality of common electrodes through the data selection circuit.

Optionally, the signal source is a dc source.

Optionally, the touch display panel further includes a plurality of pixel electrodes, and the driving chip is configured to provide a first grayscale voltage to the pixel electrodes and provide a first common voltage to the plurality of common electrodes to drive the touch display panel to perform image display refresh and touch sensing simultaneously, where the first grayscale voltage and the first common voltage are both signals modulated by the modulation signal.

Optionally, the touch display panel further comprises:

a plurality of scan lines;

a plurality of data lines crossing the plurality of scan lines in an insulated manner; and

the pixel electrode comprises a plurality of control switches, a first transmission electrode and a second transmission electrode, wherein each control switch comprises a control electrode, a first transmission electrode and a second transmission electrode, the control electrodes are connected with the scanning lines, the first transmission electrodes are connected with the data lines, and the second transmission electrodes are connected with the pixel electrodes;

the driving chip drives the touch display panel to simultaneously execute image display refreshing and self-capacitance touch sensing by providing a first scanning starting signal to the scanning line, activating a control switch connected with the scanning line, providing a first gray scale voltage to the pixel electrode through the data line and the activated control switch, and providing a first common voltage to the common electrode;

the first scanning starting signal, the first gray scale voltage and the first public voltage are all signals modulated by the modulation signal.

Optionally, when the driving chip provides the first scan-on signal to a scan line, self-capacitance touch sensing is performed on a part of the common electrode.

Optionally, an area on the touch display panel where image display refresh is performed does not overlap an area where touch sensing is performed.

Optionally, the control chip further includes a display processing circuit and a level conversion unit, the driving chip further includes a data driving circuit and a scanning signal generating circuit, the touch display panel is integrated with the scanning driving circuit, the display processing circuit is configured to receive a display data signal from a main control chip, perform color enhancement processing on the received display data signal, and output the processed display data signal to the level conversion unit, the level conversion unit performs level conversion on the received display data signal and outputs the level-converted display data to the control circuit, the control circuit correspondingly outputs a corresponding display data signal to the data driving circuit and outputs a corresponding timing control signal to the scanning driving circuit, the data driving circuit converts the received display data signal into a corresponding first gray scale voltage, and the scanning signal generating circuit is used for generating a first scanning start signal and a first scanning stop signal and outputting the first scanning start signal and the first scanning stop signal to the scanning driving circuit, the scanning driving circuit correspondingly outputs the first scanning start signal and the first scanning stop signal to corresponding scanning lines according to the time sequence control signal, wherein a control switch connected with the scanning line receiving the first scanning start signal is activated, a control switch connected with the scanning line receiving the first scanning stop signal is stopped, and the first scanning stop signal is a signal modulated by the modulation signal.

The invention also provides electronic equipment which comprises the touch display device.

Since the driving chip of the touch display device further drives the common electrode to perform touch sensing while driving the touch display panel to perform image display refresh, the time for the touch display device to perform touch sensing may become long. Accordingly, the user experience of the electronic equipment with the touch display device is better.

Drawings

FIG. 1 is a schematic diagram of the structure of an electronic apparatus according to the present invention.

FIG. 2 is a waveform diagram of an embodiment of a portion of signals of the electronic device shown in FIG. 1.

Fig. 3 is a schematic circuit diagram of an embodiment of the electronic device shown in fig. 1.

Fig. 4 is a circuit structure diagram of an embodiment of the modulation circuit shown in fig. 3.

Fig. 5 is a schematic circuit diagram of a signal source of a conventional touch driving circuit.

Fig. 6 is a schematic circuit structure diagram of a signal source of the touch driving circuit shown in fig. 3.

Fig. 7 is a schematic circuit diagram of an embodiment of the electronic device shown in fig. 1.

FIG. 8 is an exploded view of one embodiment of the touch display panel shown in FIG. 7.

Fig. 9 is a schematic cross-sectional view of the touch display panel shown in fig. 8.

Fig. 10 is a schematic cross-sectional view of another embodiment of the touch display panel shown in fig. 7.

Fig. 11 is a schematic top view of the touch display panel shown in fig. 10.

Fig. 12 is a block diagram of an embodiment of the signal processing circuit shown in fig. 3.

Fig. 13 is a schematic structural diagram of an embodiment of a signal processing unit of the signal processing circuit shown in fig. 12.

Fig. 14 is a schematic structural diagram of an electronic device according to still another embodiment of the present invention.

Fig. 15 is a circuit configuration diagram of an embodiment of the protection circuit shown in fig. 14.

Fig. 16 is a circuit configuration diagram of another embodiment of the protection circuit.

Fig. 17 is a schematic structural diagram of an electronic device according to still another embodiment of the present invention.

Fig. 18 is a schematic diagram of an embodiment of a partial circuit structure of the electronic device shown in fig. 17.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The thickness and size of each layer shown in the drawings may be exaggerated, omitted, or schematically shown for convenience or clarity, and the number of relevant elements may be schematically shown. In addition, the size of an element does not completely reflect an actual size, and the number of related elements does not completely reflect an actual number. There may be instances where the number of identical or similar or related elements in various figures may be non-uniform, e.g., due to differing figure sizes. The same reference numbers in the drawings identify the same or similar structures. It should be noted, however, that in order to make the reference numbers regular and logical, in some different embodiments, the same or similar elements or structures are given different reference numbers, and those skilled in the art can directly or indirectly determine the relationship according to the technical relevance and the related text.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

Further, the following terms are exemplary and are not intended to be limiting in any way. After reading this application, those skilled in the art will recognize that these terms apply to techniques, methods, physical elements, and systems (whether currently known or not), including extensions thereof that may be inferred or inferred by those skilled in the art after reading this application.

In the description of the present invention, it is to be understood that: the "plurality" includes two or more, "the" plurality of rows "includes two or more rows, and" the "plurality of columns" includes two or more columns, unless the present application specifically defines otherwise. In addition, the terms such as "first", "second", "third", and "fourth" appearing in the names of the elements and the names of the signals do not limit the sequence of the elements or the signals, but are used for conveniently naming the elements and clearly distinguishing the elements, so that the description is more concise and understandable. To avoid confusion of understanding, what needs to be further explained in advance is:

for a display device, the display device includes a display panel and a driving circuit. The driving circuit is used for driving the display panel to execute image display. The display panel generally includes a plurality of pixels, each pixel includes a first electrode and a second electrode, and a display gray scale of the pixel is determined by a voltage difference between the first electrode and the second electrode during operation. The first electrodes of the plurality of pixel points are, for example, integrally connected with each other, and are a whole layer of electrodes, and the second electrodes of the plurality of pixel points are separately structured. The driving circuit provides the same voltage (for example, 0 v) to the first electrode of each pixel point, and provides different voltages to the second electrode of each pixel point, so that image display of different gray scales can be realized.

When the display device is a liquid crystal display device, the first electrode is a common electrode, and the second electrode is a pixel electrode. The driving circuit drives the liquid crystal display panel to perform image display by supplying a common voltage to the first electrode and supplying a gray scale voltage to the second electrode. Alternatively, the display device may be other suitable types of display devices, such as an electronic paper display device or the like.

For each pixel point, the image display state generally includes an image display refresh state and an image display hold state. Taking a single pixel point as an example, when the driving circuit provides gray scale voltage to the second electrode and provides common voltage to the first electrode, the pixel point starts to perform image display refreshing, and when the gray scale voltage is written into the second electrode, the gray scale voltage is stopped to be provided to the second electrode, and the image display refreshing is completed. And then, the pixel point enters an image display holding state until the pixel point receives the gray scale voltage next time.

It should be noted that the image display refreshing process may further include pre-charging or pre-discharging the second electrode, and providing the gray scale voltage for realizing the predetermined gray scale image to the second electrode when the second electrode in the same row reaches the same voltage.

It can be seen that, for the image display refresh, the second electrode has a gray scale voltage writing process when the first electrode receives the common voltage.

Generally, the plurality of pixel points are arranged in a determinant, for example. The driving circuit typically performs image display refresh by driving the pixel points row by row or row by row.

It is noted herein that the two different display states of image display refresh and image display retention are provided for a better understanding of the embodiments of the present invention described below. In addition, more specifically, "image display refresh" and "image display hold" are two different technical concepts.

The first electrode and the second electrode are called as a common electrode and the second electrode is called as a pixel electrode for each suitable type of display device to which the present application is applied. Correspondingly, the display voltage signal provided by the driving circuit to the first electrode is a common voltage, and the display voltage signal provided to the second electrode is a gray scale voltage.

Touch screens generally include resistive, capacitive, infrared, and other types of touch screens, and among them, capacitive touch screens are more widely used. The capacitive touch screen comprises a mutual capacitive touch screen and a self-capacitive touch screen.

In a mutual capacitance-based touch system, a touch screen can include, for example, drive and sense regions, such as drive and sense lines. In an example case, the drive lines can form multiple rows and the sense lines can form multiple columns (e.g., orthogonal). Touch pixels can be disposed at intersections of rows and columns. During operation, the rows can be stimulated with an alternating current signal (AC) waveform, and mutual capacitances can be formed between rows and columns of the touch pixels. When an object is in proximity to the touch pixel, some of the charge coupled between the rows and columns of the touch pixel may instead be coupled to the object. This reduction in charge coupled onto the touch pixel can result in a net reduction in the mutual capacitance between rows and columns and a reduction in the AC waveform coupled onto the touch pixel. This reduction in the charge-coupled AC waveform can be detected and measured by a touch system to determine the location of the object when touching the touch screen.

In contrast, in a self-capacitance based touch system, each touch pixel can be formed by an individual electrode that forms a self-capacitance to ground. When an object is close to the touch pixel, another capacitance to ground (capacitance to ground) may be formed between the object and the touch pixel. The further capacitance to ground may result in a net increase in the self-capacitance experienced by the touch pixel. This increase in self-capacitance can be detected and measured by a touch system to determine the location of the object when touching the touch screen.

Next, each embodiment of the present invention will be explained.

Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of an electronic device according to the present invention. FIG. 2 is a waveform diagram of an embodiment of a portion of signals of the electronic device shown in FIG. 1. The electronic device 100 may be any suitable type of product, such as a portable electronic product, an intelligent home electronic product, and a vehicle-mounted electronic product, which is not limited in the present invention. The portable electronic product is, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, and the like. The intelligent household electronic product is, for example, a desktop computer, a refrigerator, a washing machine, a television and the like. Such as a navigator, a DVD on board, etc. The electronic device 100 includes a touch display apparatus 1. The touch display device 1 is used for realizing image display and touch sensing. The touch display device 1 is an In-Cell (In-Cell type or In-Cell type) type touch display device. The display device in the touch display device 1 is, for example, a liquid crystal display device. Accordingly, the touch display device 1 is a touch liquid crystal display device. The following description will be mainly given by taking a touch liquid crystal display device as an example. However, the display device in the touch display device 1 may alternatively be other suitable types of display devices, such as an electronic paper display device (EPD) and the like.

The touch display device 1 includes a touch display panel 10 and a driving circuit 20. The touch display panel 10 includes a plurality of common electrodes 101. The plurality of common electrodes 101 function as display electrodes and touch sensing electrodes. The driving circuit 20 is connected to the plurality of common electrodes 101, and is configured to drive the plurality of common electrodes 101 to perform image display and to drive the plurality of common electrodes 101 to perform touch sensing. Preferably, the driving circuit 20 is configured to drive the plurality of common electrodes 101 to perform self-capacitance touch sensing. However, the present invention is not limited thereto, and the driving circuit 20 may also be used to drive the plurality of common electrodes 101 to perform other suitable types of touch sensing, such as mutual capacitance touch sensing, as long as other modifications or extensions based on the technical ideas disclosed in the present application are within the scope of the present application.

The plurality of common electrodes 101 are arranged in a two-dimensional array, for example, and specifically, the plurality of common electrodes 101 are arranged in a plurality of rows and a plurality of columns along an X direction and a Y direction, where the X direction is a row direction and the Y direction is a column direction. However, alternatively, in other embodiments, the plurality of common electrodes 101 may also be arranged in other regular or irregular manners, which is not limited in the present invention.

The driving circuit 20 is configured to further drive the common electrode 101 to perform self-capacitance touch sensing in any process of driving the touch display panel 10 to perform image display. Therefore, even when the display resolution of the touch display device 1 is increased, the touch sensing time is not shortened, and the technical bottleneck that the touch sensing time is insufficient due to the increase of the display resolution is broken. Accordingly, the user experience of the electronic device 100 is better.

In particular, the driving circuit 20 may further drive the common electrode 101 to perform self-capacitance touch sensing while driving the touch display panel 10 to perform image display refresh. Thus, the touch sensing of the touch display device 1 is not limited to the line interval I and the frame interval.

When the driving circuit 20 drives the touch display panel 10 to simultaneously perform image display and touch sensing, all electrical signals on the touch display panel 10 are signals modulated by a modulation signal MGND. Each electrical signal on the touch display panel 10, for example, rises with the rise of the modulation signal MGND and falls with the fall of the modulation signal MGND.

The driving circuit 20 drives the touch display panel 10 to perform image display while further driving the plurality of common electrodes 101 to perform self-capacitance touch sensing, for example, by synchronously modulating all signals of the touch display panel 10 with the modulation signal MGND.

When the driving circuit 20 drives the touch display panel 10 to simultaneously perform image display and touch sensing, the elements on the touch display panel 10 are either directly driven by the driving circuit 20 or indirectly driven by the driving circuit 20. Taking an element on the touch display panel 10 as an example, when the element is directly driven by the driving circuit 20, the signal on the element is a signal modulated by the modulation signal MGND output from the driving circuit 20; when the element is not directly driven by the drive circuit 20, it is indirectly driven by the drive circuit 20 through, for example, capacitive coupling that exists between the element directly driven by the drive circuit 20 and the element indirectly driven by the drive circuit 20, and accordingly, the signal of the element superimposes the modulation signal MGND due to capacitive coupling. Thus, all the electrical signals on the touch display panel 10 are signals modulated by the modulation signal MGND. In addition to capacitive coupling, the elements in the touch display panel 10 may be indirectly driven by the driving circuit 20 through, for example, resistive elements.

However, alternatively, in other embodiments, all the electrical signals on the touch display panel 10 may be modulated signals output from the driving circuit 20.

The driving circuit 20 may further drive the common electrode 101 to perform self-capacitance touch sensing while, for example, supplying the same first common voltage Vc1 to the plurality of common electrodes 101 to perform image display. The first common voltage Vc1 is a signal modulated by the modulation signal MGND. For example, the voltage difference between the first common voltage Vc1 and the modulation signal MGND remains unchanged. The first common voltage Vc1 remains unchanged with respect to the modulation signal MGND. However, alternatively, the first common voltage Vc1 may also be a signal that varies with respect to the voltage difference between the modulated signal Vc 1. Preferably, the first common voltage Vc1 is a varying signal with respect to the ground signal GND. The ground signal GND is, for example, a constant voltage signal of 0V (volt), but is not limited to a constant voltage signal of 0V, and may be a constant voltage signal close to 0V, and is generally a voltage signal on the ground of the electronic device 100. The device ground is also called a system ground, and is, for example, a negative electrode of a power supply of the electronic device 100, such as a battery. The ground signal GND is also called a system ground voltage, a system ground signal, a device ground voltage, a device ground signal, or the like. Typically, the facility ground is not the earth's or absolute earth. However, when the electronic device 100 is connected to the Earth's Earth by a conductor, the device's Earth may also be the Earth's Earth.

Taking one common electrode 101 as an example, when the driving circuit 20 drives the common electrode 101 to simultaneously perform image display and touch sensing, the first common voltage Vc1 supplied to the common electrode 101 is simultaneously used as a display driving signal and a touch driving signal; when the driving circuit 20 drives the common electrode 101 to perform image display without simultaneously performing touch sensing, the first common voltage 101 supplied to the common electrode 101 is used as a display driving signal rather than simultaneously as a touch driving signal.

The driving circuit 20 may drive the plurality of common electrodes 101 to perform touch sensing in a time-sharing manner, or may drive the plurality of common electrodes 101 to perform touch sensing simultaneously.

Accordingly, when the driving circuit 20 drives the plurality of common electrodes 101 to simultaneously perform touch sensing, the first common voltage Vc1 supplied to the plurality of common electrodes 101 is all simultaneously used as a touch driving signal; when the driving circuit 20 drives the plurality of common electrodes 101 to perform touch sensing time-divisionally, the first common voltage Vc1 supplied to the plurality of common electrodes 101 is not all used as a touch driving signal at the same time. Therefore, the first common voltage Vc1 at which the driving circuit 20 drives the common electrode 101 to perform touch sensing can also be referred to as a touch driving signal.

When the driving circuit 20 time-divisionally drives the plurality of common electrodes 101 to perform touch sensing, although the driving circuit 20 supplies the same first common voltage Vc1 to the plurality of common electrodes 101, a circuit configuration of driving the common electrodes 101 to simultaneously perform image display and touch sensing in the driving circuit 20 is different from a circuit configuration of driving the common electrodes 101 to perform image display, not to simultaneously perform touch sensing.

Since all the electrical signals on the touch display panel 10 are synchronously modulated by the modulation signal MGND, the modulated display driving signal in all the electrical signals can drive the touch display panel 10 to perform normal image display, and the modulated display driving signal, for example, the first common voltage Vc1, can be further applied to drive the common electrode 101 to perform self-capacitance touch sensing. Accordingly, the driving circuit 20 may drive the touch display panel 10 to perform touch sensing in any process of driving the touch display panel 10 to perform image display, and the touch sensing does not affect the normal display of the image. Further, even when the display resolution of the touch display device 1 is improved, the time for touch sensing is not shortened, thereby improving the user experience of the electronic apparatus 100.

For better understanding, referring to fig. 7, regarding the display voltage difference between the common electrode 101 and the pixel electrode 103 of the pixel 11, when the signals on the common electrode 101 and the pixel electrode 103 are synchronously modulated by the modulation signal MGND, the display voltage difference does not change, and the image is normally displayed, and the first common voltage Vc1 provided to the common electrode 101 is a signal modulated by the modulation signal MGND, and the first common voltage Vc1 is a signal that changes with respect to the ground signal GND, so that the common electrode 101 can be simultaneously driven to perform self-capacitance touch sensing while ensuring that the touch display panel 10 normally displays the image.

For the pixel 11 performing the image display refresh and the pixel 11 performing the image display hold, the signal on the pixel electrode 103 of the pixel 11 performing the image display refresh is the modulated signal provided from the driving circuit 20, and the signal on the pixel electrode 103 of the pixel 11 performing the image display hold superposes the modulated signal MGND due to the capacitive coupling.

The touch display device 1 is, for example, various types of display devices such as a High Definition (HD) display device, a Full High Definition (FHD) display device, and an Ultra High Definition (UHD) display device, and correspondingly, the display resolution is, for example, 1280X720, 1920X1080, and 3840X2160, but the display resolution is not limited thereto, and for example, when the display resolution is 2K, the 2K may be 1920X1080, or 2560X1440, and other suitable cases may be adopted. Similarly, when the display resolution is 4K or 8K, a variety of cases may be included, however, in any process of image display, the touch display device 1 may simultaneously perform touch sensing without affecting normal image display. That is, the touch display device 1 may simultaneously perform image display and self-capacitance touch sensing.

In particular, the driving circuit 20 may drive the common electrode 101 to perform self-capacitance touch sensing together when driving the touch display panel 10 to perform image display refresh, so as to acquire touch information. The image display refresh and the self-capacitance touch sensing can coexist simultaneously, and the image display and the touch sensing of the touch display device 1 have high quality.

Since the signal on the touch display panel 10 is synchronously modulated by the modulation signal MGND and the modulated first common voltage Vc1 can be used as the display driving signal and the touch driving signal at the same time, the touch display device 1 can simultaneously perform image display refresh and self-capacitance touch sensing, and there is no or little interference between the image display and the touch sensing of the touch display device 1.

In addition, when the touch display panel 10 is driven by the driving circuit 20 to be in a non-image display refresh state, for example, a line gap I (see fig. 2) or a frame gap, the driving circuit 20 may also drive the common electrode 101 to perform self-capacitance touch sensing. At this time, the touch display panel 10 is in the state of image display hold as a whole, and since the signal output from the driving circuit 20 to the touch display panel 10 is synchronously modulated by the modulation signal MGND, the display voltage difference between the two

electrodes

101 and 103 of the pixel 11 (see fig. 7) is not changed when touch sensing is performed, and accordingly, the quality of image display and touch sensing of the touch display panel 10 is better.

Since the driving circuit 20 can drive the common electrode 101 to perform touch sensing together in any process of driving the touch display panel 10 to perform image display, a manufacturer can set a period of time for the driving circuit 20 to drive the common electrode 101 to perform touch sensing according to needs. Specifically, for example, the touch sensing is performed during the entire process or a part of the process of image display. More specifically, for example, during image display refresh and/or during line interval I, frame interval, touch sensing is performed, and the like.

In the present embodiment, the driving circuit 20 simultaneously drives the plurality of common electrodes 101 to perform image display, and time-divisionally drives the plurality of common electrodes 101 to perform self-capacitance touch sensing.

It should be noted that, for the plurality of common electrodes 101 as a whole, the driving circuit 20 time-divisionally drives the plurality of common electrodes 101 to perform self-capacitance touch sensing. However, for some common electrodes 101 in the plurality of common electrodes 101, the driving circuit 20 may simultaneously drive some common electrodes 101 to perform touch sensing. For example, the driving circuit 20 simultaneously drives a part of the common electrodes 101 in the plurality of common electrodes 101 each time to perform touch sensing, and completes one touch sensing of all the common electrodes 101 by sequentially driving a plurality of times. However, alternatively, the driving circuit 20 may also drive one common electrode 101 at a time to perform touch sensing.

In the present application, regardless of whether the driving circuit 20 drives one common electrode 101 to perform touch sensing each time or drives a part of the common electrodes 101 to perform touch sensing each time, as long as the driving circuit 101 performs touch sensing by sequentially driving the plurality of common electrodes 101 multiple times, the driving circuit 20 is defined to drive the plurality of common electrodes 101 in a time-sharing manner to perform touch sensing.

Specifically, the driving circuit 20 simultaneously provides the first common voltage Vc1 to the plurality of common electrodes 101, and time-divisionally receives touch sensing signals output from the plurality of common electrodes 101, so as to simultaneously drive the plurality of common electrodes 101 to perform image display, and time-divisionally drive the plurality of common electrodes 101 to perform self-capacitance touch sensing.

However, alternatively, in other embodiments, the driving circuit 20 may also simultaneously drive the plurality of common electrodes 101 to perform image display and touch sensing.

The driving circuit 20 time-divisionally drives the plurality of common electrodes 101 to perform self-capacitance touch sensing, which may be, for example: the driving circuit 20 drives the common electrode 101 by rows to perform self-capacitance touch sensing. When the driving circuit 20 supplies the first common voltage Vc1 to a row of common electrodes 101 to perform self-capacitance touch sensing and image display, the first common voltage Vc1 is also supplied to the remaining rows of common electrodes 101 to perform image display. After the driving circuit 20 drives the common electrodes 101 in one row to perform self-capacitance touch sensing, the common electrodes 101 in another row are driven to perform self-capacitance touch sensing and image display, and the common electrodes 101 in the remaining rows are driven to perform image display. Thus, by repeating a plurality of times, one touch sensing driving for all the common electrodes 101 is completed.

The driving circuit 20 may drive the common electrodes 101 row by row to perform image display and touch sensing, or may simultaneously drive a plurality of rows of common electrodes 101 at a time to perform image display and touch sensing.

Since the driving circuit 20 drives the common electrodes 101 to perform self-capacitance touch sensing in a time-sharing manner (e.g., row-by-row or line-by-line), the number of output pins of the chip integrated with the driving circuit 20 is smaller than that of the chip that drives all the common electrodes 101 to perform self-capacitance touch sensing at the same time, so that the area of the chip integrated with the driving circuit 20 can be reduced, and the purpose of saving cost can be achieved.

In various embodiments, the driving circuit 20 may drive one row of the common electrodes 101 at a time to perform touch sensing, may drive multiple rows of the common electrodes 101 at a time to perform touch sensing, and may drive all the common electrodes 101 at a time to perform touch sensing simultaneously. In addition, the driving circuit 20 may not perform touch sensing by driving the common electrode 101 in rows, for example, it is also possible to perform touch sensing by driving the common electrode 101 in columns or by driving the common electrode 101 in an irregular driving manner.

Further, the plurality of common electrodes 101 are time-divisionally driven to perform self-capacitance touch sensing for the driving circuit 20: the driving circuit 20 continuously and uninterruptedly drives the common electrode 101 to perform touch sensing each time, that is, after the driving circuit 20 simultaneously drives a part of the common electrode 101 to perform touch sensing, another part of the common electrode 101 is simultaneously driven to perform touch sensing; alternatively, the driving circuit 20 intermittently drives the plurality of common electrodes 101 to perform self-capacitance touch sensing, for example, after the driving circuit 20 drives the common electrodes 101 to perform touch sensing for a first predetermined time, the driving circuit 20 stops performing touch sensing driving for a second predetermined time, and then drives the common electrodes 101 to perform touch sensing.

However, when the driving circuit 20 simultaneously drives the plurality of common electrodes 101 to perform touch sensing, an intermittent driving method may also be adopted. That is, after the driving circuit 20 simultaneously drives the plurality of common electrodes 101 to perform touch sensing for a first predetermined time, the touch sensing driving is stopped for a second predetermined time, and then, the plurality of common electrodes 101 are simultaneously driven to perform touch sensing.

It is also possible that the driving circuit 20 performs touch sensing on the plurality of common electrodes 101 by using a combination of time-division driving and simultaneous driving.

It should be noted that the common electrode 101, which is driven by the driving circuit 20 to perform touch sensing at two adjacent times, may be partially overlapped or not overlapped.

In particular, for the manner in which the driving circuit 20 intermittently drives the plurality of common electrodes 101 to perform self-capacitance touch sensing, a period during which the common electrodes 101 perform touch sensing is defined as a first period W1, and a period during which the plurality of common electrodes 101 each perform image display, not touch sensing at the same time, is defined as a second period W2. The adjacent first periods W1 include a second period W2 therebetween. For example, the first period W1 alternates with the second period W2.

In the first period W1, the driving circuit 20 synchronously modulates the signal of the touch display panel 10 with the modulation signal MGND, and accordingly, the driving circuit 20 outputs the modulated first common voltage Vc1 to the common electrode 101 to simultaneously perform image display and self-capacitance touch sensing.

For the sake of clear distinction from the signals of the second period W2 described below, the signals output by the driving circuit 20 to the touch display panel 10 in the first period W1 are all defined as first signals, and the signals output by the driving circuit 20 to the touch display panel 10 in the second period W2 are all defined as second signals. Accordingly, the first signal includes the first common voltage Vc 1.

The driving circuit 20 outputs a second signal to the touch display panel 10 to perform image display every second period W2.

Preferably, in the second period W2, the driving circuit 20 does not synchronously modulate the signal of the touch display panel 10 with the modulation signal MGND. Accordingly, the first signal is, for example, a signal of the second signal modulated by the modulation signal MGND. The driving circuit 20 outputs the first signal to the touch display panel 10 to simultaneously perform image display and self-capacitance touch sensing.

The second signal includes a second common voltage Vc 2. In the second period W2, the driving circuit 20 outputs the second common voltage Vc2 to the plurality of common electrodes 101 to perform image display.

The first common voltage Vc1 is, for example, the second common voltage Vc2 modulated by the modulation signal MGND. The second common voltage Vc2 is, for example, a constant voltage signal with respect to the ground signal GND. For example, the second common voltage Vc2 is (-1) V for a liquid crystal display device, however, the second common voltage Vc2 may be a voltage signal with other magnitude for other types of display devices. The modulation signal MGND is for example a signal varying between 0 volt and 1.8 volt. However, the present invention is not limited thereto, and the modulation signal MGND, the second common voltage Vc2, etc. may be other suitable types of signals, which will be described below.

Since the driving circuit 20 does not synchronously modulate the signal of the touch display panel 10 with the modulation signal MGND during the second period W2, for example, the touch display device 1 is driven in the conventional display driving manner, the power consumption of the touch display device 1 is relatively reduced during the second period W2 compared to the scheme of modulating during the first period W1.

As can be seen from the above, the driving circuit 20 intermittently drives the plurality of common electrodes 101 to perform touch sensing, so that the touch display device 1 can perform self-capacitance touch sensing in any process of performing image display, and can avoid large power consumption caused by using a modulation scheme as much as possible.

In the first period W1, the driving circuit 20 drives, for example, a plurality of rows of common electrodes 101 to perform touch sensing, or drives all the common electrodes 101 to perform touch sensing once, or drives all the common electrodes 101 to perform touch sensing multiple times. The case where the driving circuit 20 drives all the common electrodes 101 to perform the touch sensing for multiple times can be divided into multiple cases, for example, the driving circuit 20 drives all the common electrodes 101 to perform the touch sensing for the same number of times, or the driving circuit 20 drives a part of the common electrodes 101 to perform the touch sensing for the same number of times and drives another part of the common electrodes 101 to perform the touch sensing for the same number of times, however, the driving circuit 20 drives the two parts of the common electrodes 101 to perform the touch sensing for different numbers of times.

It should be noted that: the setting of the duration of the second period W2 does not affect the overall detection of the touch operation of the touch display device 1, and conversely, may reduce the power consumption to some extent.

The time lengths of the respective first periods W1 are, for example, the same, and the time lengths of the respective second periods W2 are, for example, the same. However, the time lengths of the first periods W1 may not be completely the same or different from each other, and the time lengths of the second periods W2 may not be completely the same or different from each other. In addition, the first period W1 and the second period W2 for different types of touch display devices 1, for different sizes of touch display devices 1, and for different materials of touch display devices 1 may also correspond to different differences. Further, for the touch display device 1 operating in different states, for example, a black screen standby state and a bright screen image display state, the time length settings of the first period W1 and the second period W2 may also be different, so as to reduce power consumption.

However, alternatively, in some embodiments, in the second period W2, the driving circuit 20 may also perform display driving by synchronously modulating the signal of the touch display panel 10 with the modulation signal MGND.

The touch display device 1 and the operation principle thereof will be described below mainly in a manner that the driving circuit 20 intermittently and time-divisionally drives the plurality of common electrodes 101 to perform touch sensing.

Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of an embodiment of the electronic device 100. The drive circuit 20 includes a modulation circuit 21, a common voltage generation circuit 22, a touch drive circuit 23, a data selection circuit 24, a control circuit 25, and a signal processing circuit 26. The common voltage generation circuit 22 and the touch driving circuit 23 are connected to the data selection circuit 24. The data selection circuit 24 is connected to the plurality of common electrodes 101. The control circuit 25 is connected to the data selection circuit 24. The common voltage generating circuit 22 and the touch driving circuit 23 may be selectively connected to the corresponding common electrode 101 through the data selecting circuit 24.

The common voltage generating circuit 22 is used to drive the common electrode 101 to perform image display.

The touch driving circuit 23 is configured to drive the same common electrode 101 to simultaneously perform image display and self-capacitance touch sensing.

The signal processing circuit 26 is configured to perform touch coordinate calculation according to the touch sensing signal output by the touch driving circuit 23, and acquire touch position information.

The data selection circuit 24 correspondingly selects and outputs the signal generated by the common voltage generation circuit 22 to the corresponding common electrode 101 to perform image display and selects and outputs the signal generated by the touch driving circuit 23 to the corresponding common electrode 101 to perform image display and self-capacitance touch sensing under the control of the control circuit 25.

The control circuit 25 controls the signal output timing of the data selection circuit 24 according to a control signal of the main control chip 3, for example.

The modulation circuit 21 is configured to generate the modulation signal MGND. The modulation signal MGND is, for example, a square-wave pulse signal, and includes a first reference signal and a second reference signal. The voltage condition of the first reference signal and the second reference signal can be any one of the following five conditions:

firstly, the method comprises the following steps: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;

secondly, the method comprises the following steps: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is negative voltage;

thirdly, the method comprises the following steps: the voltage of the first reference signal is a positive voltage, the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal;

fourthly: the voltages of the first reference signal and the second reference signal are positive voltages with different magnitudes;

fifth, the method comprises the following steps: the voltages of the first reference signal and the second reference signal are negative voltages with different magnitudes.

And taking a ground signal GND as a reference, wherein the first reference signal and the second reference signal are constant voltage signals. The modulation signal is a square wave pulse signal in which a first reference signal and a second reference signal appear alternately.

The modulation signal MGND is, for example, a periodically varying square wave pulse signal. The modulation signal MGND is not limited to a square wave pulse signal, but may be other suitable waveform signals, such as a sine wave signal, a two-step signal, and the like. The modulation signal MGND is not limited to a periodically varying signal, and may be a non-periodically varying signal.

In the present embodiment, the first reference signal of the modulation signal MGND is the ground signal GND, and the second reference signal is a driving signal higher than the first reference signal. For example, the ground signal GND is 0V, and the driving signal is 1.8V. However, the grounding signal is 0V, and the driving signal is 1.8V, which is only an example, and the corresponding amplitude can be adjusted according to the product condition, and the invention is not limited thereto.

Specifically, the driving circuit 20 may further include a voltage generating circuit 27. The voltage generating circuit 27 is used for generating the second reference signal. The modulation circuit 21 is connected to the device ground of the electronic device 100 and the voltage generation circuit 22, receives the ground signal GND on the device ground and the second reference signal generated by the voltage generation circuit 22, and generates the modulation signal MGND in response thereto. To distinguish the ground signal GND, the modulated signal is labeled MGND.

In the present embodiment, the driving circuit 20 provides the modulation signal MGND to a part of the driving circuit 20 to achieve synchronous modulation of all signals of the touch display panel 10. That is, as long as the signal on the ground is the modulation signal MGND, all signals of the touch display panel 10 are synchronously changed into the signal modulated by the modulation signal MGND.

The ground to which the modulation signal MGND is applied during the first period W1 is defined as a modulation ground to distinguish the device ground to which the ground signal GND is applied. Accordingly, in the first period W1, the electronic device 100 is referenced to two domains. The two domains are shown as domain 80 referenced to ground signal GND and domain 90 referenced to modulated signal MGND, respectively. The ground terminal of the circuit in the domain 80 with reference to the ground signal GND is used for loading the ground signal GND, and the ground terminal of the circuit in the domain 90 with reference to the modulation signal MGND is used for loading the modulation signal MGND. Further, for a circuit with the modulation ground as ground, the reference ground thereof is the modulation signal MGND loaded with the modulation ground; for a circuit with the device ground as ground, the ground signal GND applied to the device ground is referenced to ground potential.

That is, in the first period W1, the ground signal GND is modulated as the modulation signal MGND, and all signals with the modulation signal MGND loaded in modulation as a reference are modulated by the modulation signal MGND.

In contrast, in the second period W2, the electronic device 100 is voltage-referenced by one domain, and both of them are voltage-referenced by the ground signal GND. The ground of the circuits in the electronic device 100 is connected to the device ground and receives the ground signal GND. That is, in the second period W2, the modulated ground pair becomes the device ground for transmitting the ground signal GND instead of the modulated signal MGND.

It is previously explained that, in the present embodiment, in the first period W1, the common voltage generation circuit 22, the touch drive circuit 23, the data selection circuit 24, and the control circuit 25 are located in the domain 90, and the modulation circuit 21 and the voltage generation circuit 27 are located in the domain 80. A portion of the signal processing circuit 26 is located in the domain 80 and a portion is located in the domain 90.

The modulation circuit 21 comprises a modulation terminal M. The modulation circuit 21 outputs the modulation signal MGND to the ground terminal of each circuit in the domain 90 through the modulation terminal M, so that the circuit in the domain 90 with the modulation signal MGND as a voltage reference outputs a signal modulated by the modulation signal MGND to the touch display panel 10. The modulation terminal M is connected with a modulation ground or serves as one terminal of the modulation ground. In addition, the modulation signal MGND is superimposed by a signal on, for example, an element in a floating state (e.g., a pixel electrode 103 which performs image display holding described later, see fig. 7) on the touch display panel 10 due to a capacitive coupling effect. Therefore, in the first period W1, all the electric signals on the touch display panel 10 become signals modulated by the modulation signal MGND.

Circuits in the domain 90, for example, the common voltage generating circuit 22, the touch driving circuit 23, the data selecting circuit 24, the control circuit 25, and some circuits in the signal processing circuit 26, if a ground terminal is included, the ground terminal may be directly connected to the modulation ground.

In the second period W2, the modulation circuit 21, the common voltage generation circuit 22, the touch driving circuit 23, the data selection circuit 24, the control circuit 25, the signal processing circuit 26, and the voltage generation circuit 27 are all referenced to the ground signal GND.

Accordingly, in the first period W1, the modulation circuit 21 generates the modulation signal MGND according to the ground signal GND on the device ground and the driving signal from the voltage generation circuit 27, and supplies the modulation signal MGND to the modulation ground. The common voltage generating circuit 22 correspondingly generates the first common voltage Vc1 and provides the first common voltage Vc to the corresponding common electrode 101 through the data selecting circuit 24 to perform image display. The touch driving circuit 23 correspondingly generates the first common voltage Vc1, and provides the first common voltage Vc1 to the corresponding common electrode 101 through the data selection circuit 24 to perform image display and self-capacitance touch sensing. The signal processing circuit 26 receives the touch sensing signal output from the touch driving circuit 23 to acquire touch information. That is, the first common voltage Vc1 output to the common electrode 101 by the touch driving circuit 23 is used as a display driving signal and a touch driving signal at the same time, and the first common voltage Vc1 output to the common electrode 101 by the common voltage generating circuit 22 is used as a display driving signal only.

The touch driving circuit 23 and the common voltage generating circuit 22 output the first common voltage Vc1 to the plurality of common electrodes 101 as the same signal modulated by the modulation signal MGND, and the touch driving circuit 23 can further transmit the touch sensing signal sensed from the common electrode 101 to the signal processing circuit 26 to obtain touch information, so that the driving circuit 20 can drive the touch display panel 10 to simultaneously perform image display and self-capacitance touch sensing.

Since the first common voltage Vc1 provided to the common electrode 101 by the touch driving circuit 23 is used as both a touch driving signal and a display driving signal, when the common voltage generating circuit 22 drives some common electrodes 101 to perform image display, the touch driving circuit 23 can drive the rest common electrodes 101 to perform image display and self-capacitance touch sensing together. Therefore, the touch display device 1 of the present invention can simultaneously perform touch sensing in any process of performing image display, and there is no interference between touch sensing and image display or less interference to image display.

Further, in the second period W2, the common voltage generating circuit 22 supplies the second common voltage Vc2 to the plurality of common electrodes 101 through the data selecting circuit 24 to perform image display.

Preferably, in the second period W2, the data selection circuit 24 is controlled by the control circuit 25, and the second common voltage Vc2 on the plurality of common electrodes 101 is all from the common voltage generation circuit 22. The touch driving circuit 23 may further output the second common voltage Vc2 to the data selection circuit 24, for example, but the data selection circuit 24 selects to output the second common voltage Vc2 from the common voltage generation circuit 22 to the common electrode 101, thereby causing the touch display device 1 to perform image display rather than touch sensing for the second period W2.

By the first period W1 alternating with the second period W2, the touch display device 1 realizes image display and touch sensing.

In displaying one frame image, the touch display device 1 may include one first period W1, a plurality of first periods W1, a portion of one first period W1, portions of one first period W1 and first period W1, or portions of a plurality of first periods W1 and first periods W1.

The touch driving circuit 23 and the common voltage generating circuit 22 have different circuit structures, so that the common electrode 101 connected to the touch driving circuit 23 can be further used as a touch sensing electrode even if the touch driving circuit 23 and the common voltage generating circuit 22 provide the same signal to the common electrode 101.

The touch driving circuit 23 further receives a touch sensing signal output from the common electrode 101, and acquires touch information according to the touch sensing signal.

Specifically, the common electrode 101 electrically connected to the touch driving circuit 23 may output different touch sensing signals to the touch sensing driving circuit 23 in response to whether a target object (e.g., a suitable object such as a finger) is touched or approached, and accordingly, the touch driving circuit 23 may obtain touch information according to the touch sensing signals.

In contrast, the common voltage generation circuit 22 does not receive a signal from the common electrode 101, or, even if a signal from the common electrode 101 is received, based on the circuit structure of the common voltage generation circuit 22 itself, a signal output from the common electrode 101 electrically connected to the common voltage generation circuit 22 is substantially constant regardless of whether a target object touches or approaches above the common electrode 101, and thus touch information cannot be acquired.

Preferably, the common voltage generating circuit 22 and the touch driving circuit 23 share the same signal source 221, and the signal source 221 is modulated by the modulation signal MGND to correspondingly generate a first reference voltage signal. The common voltage generating circuit 22 and the touch driving circuit 23 correspondingly output the same first common voltage Vc1 to the plurality of common electrodes 101 according to the first reference voltage signal, wherein the common electrodes 101 electrically connected to the common voltage generating circuit 22 perform image display rather than touch sensing simultaneously, and the common electrodes 101 electrically connected to the touch driving circuit 23 perform image display and self-capacitance touch sensing simultaneously.

Since the touch driving circuit 23 supplies the same signal as the common voltage generating circuit 22 to the common electrode 101, the touch driving circuit 23 does not affect the common electrode 101 performing self-capacitance touch sensing to perform normal image display while driving the common electrode 101 to perform self-capacitance touch sensing. In addition, since the common voltage generating circuit 22 and the touch driving circuit 23 share the same signal source 221, the signals output to the plurality of common electrodes 101 by the common voltage generating circuit 22 and the touch driving circuit 23 can be the same or substantially the same, thereby ensuring the quality of touch sensing and image display.

In some embodiments, the common voltage generating circuit 22 includes, for example, a signal source 221, a follower 222, and a stabilizing circuit 223. The signal source 221 is connected to the follower 222, and the follower 222 is further connected to the data selection circuit 24. One end of the voltage stabilizing circuit 223 is connected between the follower 222 and the data selection circuit 24, and the other end is connected to the modulation ground.

The signal source 221 includes a ground terminal a and an output terminal b. The ground terminal a is connected to the modulation ground. The output b is connected to the follower 222. The signal source 221 is, for example, a dc source, however, the invention is not limited thereto, and the signal source 221 may also be other suitable circuit structures.

The follower 222 transmits the signal output from the signal source 221 to the data selection circuit 24, and provides the signal to the corresponding common electrode 101 through the data selection circuit 24 to perform image display. The follower 222 is, for example, a first amplifier, however, the invention is not limited thereto, and the follower 222 may also be other suitable circuit structures, and is not limited to the first amplifier. In the above embodiment, the follower 222 is taken as a first amplifier as an example for explanation. The first amplifier 222 includes a third power terminal c1, a third ground terminal d1, a first non-inverting terminal e1, a first inverting terminal f1, and a first output terminal g 1. Wherein the third power supply terminal c1 is used for loading the power supply voltage VDD 1. The third ground terminal d1 is used for connecting a modulation ground. The first non-inverting terminal e1 is used for connecting with the output terminal b of the signal source 221. The first inverting terminal f1 is shorted with the first output terminal g 1. The first output terminal g1 is connected to the data selection circuit 24.

The voltage stabilizing circuit 223 is connected between the first output terminal g1 and the modulation ground, and is used for stabilizing the voltage between the follower 222 and the data selection circuit 24. In the present embodiment, the voltage stabilizing circuit 223 includes, for example, a voltage stabilizing capacitor Cw. The voltage stabilizing capacitor Cw is connected between the first output terminal g1 and the modulation ground.

In operation, during a first period W1, the ground terminal a and the third ground terminal d1 both receive the modulation signal MGND, the signal source 221 correspondingly outputs the first reference voltage signal to the first amplifier 222 through the output terminal b, and the first amplifier 222 is in a virtual short state, and then correspondingly outputs a first common voltage Vc1, which is the same as the first reference voltage signal, to the data selection circuit 24, and is provided to the corresponding common electrode 101 through the data selection circuit 24 to perform image display.

In the second period W2, the ground terminal a and the third ground terminal d1 both receive the ground signal GND, the signal source 221 correspondingly outputs a second reference voltage signal to the first amplifier 222 through the output terminal b, and the first amplifier 222 is in a virtual short state, and then correspondingly transmits a second common voltage Vc2, which is the same as the second reference voltage signal, to the data selection circuit 24 and is provided to the plurality of common electrodes 101 through the data selection circuit 24 to perform image display.

The touch driving circuit 23 includes, for example, the signal source 221 and a plurality of operational amplifiers 231. Each operational amplifier 231 comprises a second amplifier 232 and a feedback branch 233. The second amplifier 232 includes a fourth power terminal c2, a fourth ground terminal d2, a second in-phase terminal e2, a second inverting terminal f2, and a second output terminal g 2. Wherein the fourth power supply terminal c2 is used for loading the power supply voltage VDD 2. The fourth ground terminal d2 is used for connecting a modulation ground. The second non-inverting terminal e2 is used for connecting with the output terminal b of the signal source 221. The second inverting terminal f2 is connected to the data selection circuit 24, and further connected to the second output terminal g2 through the feedback branch 233. The second output terminal g2 is further connected to the signal processing circuit 26.

The feedback branch 233 includes, for example, a feedback capacitor 233a and a reset switch 233 b. Preferably, the feedback capacitor 233a and the reset switch 233b are connected in parallel between the second inverting terminal f2 and the second output terminal g 2.

In operation, the fourth ground terminal d2 receives the modulation signal MGND during the first period W1. The second amplifier 232 is in the virtual short state, receives the first reference voltage signal from the signal source 221, and correspondingly outputs the first common voltage Vc1 to the data selection circuit 24, and the first common voltage Vc1 is provided to the corresponding common electrode 101 through the data selection circuit 24. The feedback branch 233 is used for transmitting the touch sensing signal sensed by the common electrode 101 to the signal processing circuit 26.

Since the touch sensing signal is also modulated by the modulation signal MGND, when the signal processing circuit 26 performs analysis calculation on the touch sensing signal, the touch sensing signal may be inversely modulated as needed to acquire touch coordinate information.

The number of the plurality of operational amplifiers 231 is, for example, the same as the number of columns of the plurality of common electrodes 101. Each operational amplifier 231 is selectively connected to the common electrode 101 of one column through the data selection circuit 24. However, the number of the plurality of operational amplifiers 231 may also be the same as the number of rows of the plurality of common electrodes 101. For example, the common electrode 101 of each column may be selectively connected to two operational amplifiers 231.

The touch driving circuit 23 of the present invention supplies the same touch driving signal as the first common voltage Vc1 generated by the common voltage generating circuit 22 to the common electrode 101, so that the touch driving signal can drive the common electrode 101 to perform both image display and self-capacitance touch sensing, and thus, the plurality of common electrodes 101 of the touch display device 1 can further perform touch sensing while performing image display.

Further, compared with the touch driving circuit 23 and the common voltage generating circuit 22 respectively using a signal source, since the touch driving circuit 23 and the common voltage generating circuit 22 of the present application share the same signal source 221, the first common voltage Vc1 output to the plurality of common electrodes 101 by the touch driving circuit 23 and the common voltage generating circuit 22 through the data selecting circuit 24 may tend to be the same or may be the same, thereby ensuring the quality of image display and touch sensing of the touch display device 1.

However, in some modified embodiments, a circuit configuration may be selected in which the touch driving circuit 23 and the common voltage generating circuit 22 use one signal source, respectively.

In the second period W2, the modulation ground becomes the device ground, the signal source 221 outputs the second reference voltage signal to the follower 222 and the plurality of operational amplifiers 231, and the control circuit 25 controls the data selection circuit 24 to selectively output the second common voltage Vc2 from the common voltage generation circuit 22 to the plurality of common electrodes 101 to perform image display.

Further, in some modified embodiments, a first switch (not shown) may be disposed between the signal source 221 and the follower 222, and a second switch (not shown) may be disposed between the signal source 221 and the operational amplifier 231, and accordingly, in the first period W1, both the first switch and the second switch may be in a closed state, and in the second period W2, the first switch may be in a closed state, and the second switch may be in an open state.

The data selection circuit 24 includes, for example, a first data selector 241 and a plurality of second data selectors 242. The follower 222 is connected to the first data selector 241, and the first data selector 241 is connected to the plurality of common electrodes 101, respectively. Each operational amplifier 231 is connected to a second data selector 242, and each second data selector 242 is connected to a row of common electrodes 101. The first data selector 241 and the plurality of second data selectors 242 are respectively connected to the control circuit 25. The control circuit 25 controls signal output timings of the first data selector 241 and the plurality of second data selectors 242.

For example, the plurality of common electrodes 101 are arranged in a matrix of 26 rows and 40 columns, and correspondingly, the number of the plurality of operational amplifiers 231 is 40, and the number of the second data selectors 242 is 40. The first data selector 241 includes a first output port O1 for outputting a signal from the common voltage generating circuit 22 to the corresponding common electrode 101. The number of the first output ports O1 is the same as the number of rows of the plurality of common electrodes 101, i.e., 26. Each of the second data selectors 242 includes a second output port O2 for outputting a signal from the touch driving circuit 23 to the corresponding common electrode 101. The number of the second output ports O2 is the same as the number of rows of the plurality of common electrodes 101, i.e., 26. Note that, in fig. 2, only a part of the circuit configuration is actually shown, for example, only 2 operational amplifiers 231, 2 second data selectors 242, and a part of the common electrode 101 are shown, limited to the size shown in the drawing.

In this embodiment, the second output port O2 of each second data selector 242 is connected to a common electrode 101. Each of the first output ports O1 is connected between a second output port O2 of each of the second data selectors 242 and the common electrode 101, so as to save the number of the connection lines L, and different first output ports O1 are connected to different second output ports O2.

However, it is to be understood that, alternatively, in other embodiments, the number of the first data selectors 241 may be multiple, and is not limited to one, and accordingly, the connection relationship between the first output ports O1 of the first data selectors 241 and the second output ports O2 of the second data selectors 242 may be adjusted correspondingly, for example, each first data selector 241 is connected to a part of the second data selectors 242, or the first output port O1 of each first data selector 241 is connected to a part of the second output ports O2 of the second data selectors 242, and so on.

In the first period W1, the plurality of second data selectors 242 are controlled by the control circuit 25 to be the data selector of 1-out-of-26, and accordingly, each second data selector 242 outputs the first common voltage Vc1 from the touch driving circuit 23 to a common electrode 101 at a time, and the plurality of second data selectors 242 drive all common electrodes 101 to perform touch sensing at once through 26 times. The first data selector 241 is a data selector for 26 to 25 under the control of the control circuit 25, and when the plurality of second data selectors 242 output the first common voltage Vc1 to the common electrode 101 in the same row, the first data selector 241 outputs the first common voltage Vc1 from the common voltage generating circuit 22 to each common electrode 101 in the remaining rows. It should be noted that 26 touch actuations may be completed in one or more first time periods W1.

In the second period W2, the first data selector 241 becomes a 26-out-of-26 data selector under the control of the control circuit 25, and outputs the second common voltage Vc2 from the common voltage generating circuit 22 to all the common electrodes 101. The second data selector 242 stops outputting the signal to the common electrode 101, for example, under the control of the control circuit 25.

The touch driving circuit 23 and the common voltage generating circuit 22 of the touch display device 1 are not limited to the above-described circuit configuration, and may have other suitable circuit configurations. For example, the data selection circuit 24 is not limited to the first data selector 241 and the second data selector 242, and may have other suitable switch circuit structures.

By the data selection circuit 24, on one hand, the number of the connection lines L between the driving circuit 20 and the plurality of common electrodes 101 can be reduced, and on one hand, the common electrodes 101 can be driven in a time-sharing manner to perform touch sensing while the plurality of common electrodes 101 are driven to perform image display.

As mentioned above, the touch display device 1 can also continuously perform image display and touch sensing, for example, the common voltage generating circuit 22 and the touch driving circuit 23 continuously provide the first common voltage Vc1 to the common electrode 101 in time, and the common voltage generating circuit 22 and the touch driving circuit 23 cooperate to drive the plurality of common electrodes 101 in space. In other words, without the second period W2, the control circuit 25 controls the first data selector 241 to always maintain the 26-out-of-25 state and controls the plurality of second data selectors 242 to always maintain the 26-out-of-1 state.

For another example, only the touch driving circuit 23 may be selected to continuously drive the plurality of common electrodes 101 while performing image display and touch sensing, and the common voltage generating circuit 22 may be omitted.

Further, when the plurality of common electrodes 101 are arranged in other regular or irregular manners, the relationship between the data selection circuit 24, the common voltage generation circuit 22, the touch driving circuit 23 and the plurality of common electrodes 101 may be adjusted accordingly, and for a person skilled in the art, according to the technical content disclosed above, corresponding circuit information may be reasonably inferred, and therefore, the details are not repeated herein.

In addition, in some embodiments, the driving circuit 20 may further include a fingerprint driving circuit, for example, the fingerprint driving circuit may be selectively connected to the plurality of common electrodes 101, when the driving circuit 20 drives a portion of the common electrodes 101 to simultaneously perform touch sensing and image display, the fingerprint driving circuit may also drive a portion of the common electrodes 101 to simultaneously perform fingerprint sensing and image display, and the common voltage generating circuit 22 drives a portion of the common electrodes to perform image display. Therefore, in the present application, the operation of driving the common electrode 101 is not limited to the common voltage generating circuit 22 and the touch driving circuit 23, but may also include other suitable types or suitable functional circuits, and the corresponding functions are performed by correspondingly driving the common electrode 101.

Referring to fig. 3 and fig. 4 together, fig. 4 is a circuit structure diagram of an embodiment of the modulation circuit 21. The modulation circuit 21 comprises a first active switch 211, a second active switch 213, and a control unit 215. The first active switch 211 includes a control terminal K1, a first transmission terminal T1, and a second transmission terminal T2, and the second active switch 213 includes a control terminal K2, a first transmission terminal T3, and a second transmission terminal T4. The control terminals K1 and K2 are both connected with the control unit 215. The second terminal T2 of the first active switch 211 is connected to the first terminal T3 of the second active switch 213 and defines an output node N on the connection line, the first terminal T1 of the first active switch 211 receives a first reference signal, the second terminal T4 of the second active switch 213 receives a second reference signal, and the control unit 215 controls the output node N to alternately output the first reference signal and the second reference signal by controlling the first and second

active switches

211, 213, so as to form the modulation signal MGND.

In this embodiment, the first reference signal is a ground signal GND, and the second reference signal is a driving signal. Accordingly, the second transmission terminal T4 is connected to the voltage generating circuit 27, the first transmission terminal T1 is connected to the device ground for receiving a ground signal GND, and the node N is configured to output the modulation signal MGND to the modulation ground.

The first active switch 211 and the second active switch 213 are suitable types of switches such as thin film transistors, triodes, metal oxide semiconductor field effect transistors, and the like.

The working principle of the modulation circuit 21 is as follows: in a first period W1, the control unit 215 is configured to control the modulation circuit 21 to output a modulation signal MGND to the ground in the domain 90, where the ground in the domain 90 is the modulation ground; in the second period W2, the control unit 215 is configured to control the modulation circuit 21 to output the ground signal GND to the modulation ground, which becomes the same as the device ground.

It should be further noted that, during the first period W1, the electronic device 100 has a reference field 80 referenced to the ground signal GND and a reference field 90 referenced to the modulation signal MGND, and for the touch display device 1, since the touch driving circuit 23 provides the excitation signal to the common electrode 101 and further receives the touch sensing signal output from the common electrode 101 itself to obtain the touch information, the principle of the touch driving circuit 23 when driving the touch display panel 10 to perform touch sensing is the self-capacitance touch sensing principle.

When the electronic device 100 employs two

domains

80 and 90 with GND and MGND as references, not only the signal of the touch display panel 10 is modulated in synchronization as a whole to improve the signal-to-noise ratio, but also some circuit structures of the touch driving circuit 23 in the domain 90 are simplified accordingly, so that the circuit structure can be simplified and the product cost can be saved. For example, the signal source 221 of the touch driving circuit 23 and the signal source 221a (see fig. 5 below) of the conventional touch driving circuit are taken as examples for explanation.

Referring to fig. 5 and fig. 6 together, fig. 5 is a schematic circuit structure diagram of the signal source 221a of the conventional touch driving circuit. Fig. 6 is a schematic circuit diagram of the signal source 221 of the touch driving circuit 23. It should be noted that, in the conventional touch driving circuit, the signal source 221a is referenced to the ground signal GND as a voltage reference. In the touch driving circuit 23 of the present application, the signal source 221 is a voltage reference based on the modulation signal MGND. The signal source 221a includes a current source Ia, a resistor Ra, a first switch K1a, and a second switch K2 a. The current source Ia and the resistor Ra are connected in series between the power source terminal P1 and the device ground GND. One end of the first switch K1a is connected between the current source Ia and the resistor Ra, and the other end is connected to the non-inverting terminal h of the touch driving circuit. One end of the second switch K2a is connected between the first switch K1a and the in-phase terminal h, and the other end is connected to the device ground for applying the ground signal GND. By controlling the first switch K1a and the second switch K2a to be alternately turned on, a touch sensing driving signal is correspondingly generated to the non-inverting terminal h. Wherein the power supply terminal P1 is kept constant with respect to the device ground GND.

In contrast, the signal source 221 includes a current source Ib and a resistor Rb, and the current source Ib and the resistor Rb are connected in series between the power supply terminal P2 and the ground for applying the modulation signal MGND. The receiving end of the touch driving circuit 23, i.e. the second non-inverting end g2, is connected between the current source Ib and the resistor Rb. Since the modulation signal MGND is varied, the output voltage between the power terminal P2, the current source Ib and the resistor Rb varies with the variation of the modulation signal MGND at the modulation ground, thereby correspondingly generating a touch sensing driving signal to the second non-inverting terminal g 2. In addition, a capacitor may be added between the modulation ground and the power supply terminal P2 to maintain signal stability.

The circuit structure of the signal source 221 becomes simple compared to the signal source 221a, and the touch sensing driving signal generated by the signal source 221 is stable compared to the touch sensing driving signal generated by the signal source 221 a.

Referring to fig. 2, fig. 3, and fig. 7, fig. 7 is a schematic circuit structure diagram of an embodiment of the electronic device 100. As described above, in this embodiment, the touch display device 1 is described by taking a liquid crystal display device as an example. However, it is to be understood that, when the touch display device 1 is a display device of other types, the circuit structures of the touch display device 1 may be different from each other, and the circuit structures of different liquid crystal display devices may also be different from each other. In the present embodiment, the touch display panel 10 of the touch display device 1 includes a plurality of pixel points 11. Each pixel 11 is driven by the driving circuit 20 to perform image display and touch sensing. Each pixel 11 includes the common electrode 101, a pixel electrode 103, and a switching unit 104. In the present embodiment, the switch unit 104 includes a control switch 105. The control switch 105 includes a control electrode G, a first transfer electrode S, and a second transfer electrode D. The control electrode G and the first transfer electrode S are connected to the drive circuit 20. The second transfer electrode D is connected to the pixel electrode 103. The driving circuit 20 is used for driving the control switch 105 to be turned on and off. In this embodiment, the switch unit 104 includes one control switch 105, but in other embodiments, the switch unit 104 may also include two control switches 105 or more control switches, but may also further include other circuit elements, such as a memory circuit. The two control switches 105 are connected in series, for example.

The control switch 105 is, for example, a thin film transistor switch. Such as low temperature polysilicon thin film transistor switches, amorphous silicon thin film transistor switches, Indium Gallium Zinc Oxide (IGZO) thin film transistor switches, high temperature polysilicon thin film transistor switches, and the like. However, the invention is not limited thereto, and the control switch 105 may be other suitable types of switches. When the control switch 105 is a tft switch, the control electrode G is a gate of the tft switch, the first transmission electrode S is a source of the tft switch, and the second transmission electrode D is a drain of the tft switch.

In the present embodiment, each pixel 11 includes a pixel electrode 103 and a control switch 105. Since the size of the common electrode 101 is generally larger than that of the pixel electrode 103, accordingly, a plurality of pixel points 11 share the same common electrode 101. However, in other modified embodiments, each pixel 11 may include a common electrode 101.

In the first period W1, the driving circuit 20 drives the control switch 105 to turn on by providing the first scan-on signal Vg1 to the control switch 105, and provides the first gray-scale voltage Vd1 to the pixel electrode 103 and the first common voltage Vc1 to the common electrode 101 through the turned-on control switch 105, so as to drive the pixel 11 to perform image display refresh. The first scan-on signal Vg1, the first grayscale voltage Vd1, and the first common voltage Vc1 are all signals synchronously modulated by the modulation signal MGND.

In general, the driving circuit 20 drives the plurality of pixel points 11 by rows to perform image display refresh. In the first period W1, when the driving circuit 20 drives the pixel points 11 in a certain row to perform image display refresh, the driving circuit 20 turns off the control switches 105 of the pixel points 11 in the remaining row by providing the first scan-off signal Vg2 to the control switches 105 of the pixel points 11 in the remaining row, so that the pixel points 11 in the remaining row are in the image display hold state. The first scan-cut signal Vg2 is a signal modulated by the modulation signal MGND.

Generally, the plurality of pixels 11 are arranged in a plurality of rows and columns. However, the pixels 11 may be arranged in other regular or irregular manners.

In order to avoid the interference of the touch sensing to the image display refreshing, it is preferable that the driving circuit 20 simultaneously drives the pixel 11 performing the touch sensing and the pixel 11 performing the image display refreshing to be not overlapped, for example, the pixel 11 performing the image display refreshing and the common electrode 101 performing the touch sensing are spaced by a predetermined row in the pixel 11 performing the image display maintaining. The pixel 11 performing touch sensing and the pixel 11 performing image display refreshing can be kept at a predetermined distance without overlapping by software or hardware or software and hardware control.

However, alternatively, in other embodiments, the pixel 11 performing the image display refresh may also select to perform the touch sensing simultaneously under the driving of the driving circuit 20, or the pixel 11 performing the image display refresh and the pixel 11 performing the touch sensing simultaneously may also select to partially overlap, where the partially overlapping is, for example, the pixel 11 completely or partially shares a common electrode 101.

In contrast, in the second period W2, the driving circuit 20, for example, supplies the second scan-on signal Vg3 to the control switch 105, activates the control switch 105, supplies the second gray scale voltage Vd2 to the pixel electrode 103 through the activated control switch 105, and supplies the second common voltage Vc2 to the common electrode 101 to perform image display refresh. When the driving circuit 20 drives the pixel points 11 in a certain row to perform image display refresh, the control switch 105 that provides the second scanning cut-off signal Vg4 to the pixel points 11 in the remaining rows is turned off, so that the pixel points 11 in the remaining rows are in the image display hold state.

The first scan turn-on signal Vg1 is, for example, a signal of the second scan turn-on signal Vg3 modulated by the modulation signal MGND. The first scan cutoff signal Vg2 is, for example, a signal of the second scan cutoff signal Vg4 modulated by the modulation signal MGND.

The first grayscale voltage Vd1 is a signal modulated by the modulation signal MGND for the corresponding second grayscale voltage Vd 2. For example, when a first gray scale voltage Vd1 is a second gray scale voltage Vd2 modulated by the modulation signal MGND, a voltage difference between the second gray scale voltage Vd2 and the second common voltage Vc2 is equal to a voltage difference between the first gray scale voltage Vd1 and the first common voltage Vc 1.

For each pixel point 11: the voltage difference between the first pixel electrode 103 and the common electrode 101 determines the display gray scale of each pixel 11. In the case of the liquid crystal display device, in order to prevent liquid crystal molecules from being polarized, the gray scale voltage may be divided into a positive polarity gray scale voltage and a negative polarity gray scale voltage for the same display gray scale level.

The touch display panel 10 may further include a plurality of scan lines 281 and a plurality of data lines 291. The plurality of scan lines 281 and the plurality of data lines 291 are, for example, arranged to be insulated and crossed. The plurality of scanning lines 281 extend in the X direction, for example, and are arranged in the Y direction. The plurality of data lines 291 extend, for example, in the Y direction and are arranged in the X direction. Each scanning line 281 is connected to the control electrode G of the control switch 105 of one row of pixel points 11. Each data line 291 is connected to the first transmission electrode S of the control switch of one row of pixels 11.

The plurality of scan lines 281 are used for transmitting a first scan on signal Vg1, a second scan on signal Vg3, a first scan off signal Vg2, or a second scan off signal Vg4 from the driving circuit 20 to the control electrode G of the control switch 105. The data lines 291 are used for transmitting the first gray scale voltage Vd1 or the second gray scale voltage Vd2 from the driving circuit 20 to the first transmission electrode S of the control switch 105.

The driving circuit 20 further includes a display driving circuit 20 a. The display driving circuit 20a is used for driving the touch display panel 10 to perform image display. The display driving circuit 20a includes a scan driving circuit 28, a scan signal generating circuit 28a, a data driving circuit 29, and the common voltage generating circuit 22. The scan driving circuit 28 is connected to the plurality of scan lines 281. The data driving circuit 29 is connected to the plurality of data lines 291. The scan driving circuit 28 and the data driving circuit 29 are both connected to the control circuit 25. The control circuit 25 is further used for controlling the scanning timing of the scanning driving circuit 28 and providing the corresponding display data to the data driving circuit 29. The scan signal generation circuit 28a is connected to the scan drive circuit 28. The scan signal generating circuit 28a is configured to generate the first scan start signal Vg1, the second scan start signal Vg3, the first scan stop signal Vg2, or the second scan stop signal Vg4, and provide the first scan start signal Vg1, the second scan start signal Vg3, the first scan stop signal Vg2, or the second scan stop signal Vg4 to the scan driving circuit 28. The scan driving circuit 28, for example, includes a circuit structure of a shift register, receives the scan-on signal and the scan-off signal from the scan signal generating circuit 28a, and correspondingly supplies the scan-on signal and the scan-off signal to the corresponding scan lines 281 under the control of the control circuit 25.

In this embodiment, in operation, the scan signal generating circuit 28a, the scan driving circuit 28 and the data driving circuit 29 are also located in the domain 90 during the first period W1. The scan signal generating circuit 28a is modulated by the modulation signal MGND of the modulation circuit 21 to output the first scan on signal Vg1 and the first scan off signal Vg2 to the scan driving circuit 28, the scan driving circuit 28 correspondingly outputs the first scan on signal Vg1 and the first scan off signal Vg2 to the corresponding scan lines 281 under the timing control of the control circuit 25, and the data driving circuit 29 is modulated by the modulation signal MGND of the modulation circuit 21 to output the first grayscale voltage Vd1 to the data lines 291, so as to perform image display refresh for the corresponding pixel electrodes 103 through the activated control switch 105. The common voltage generating circuit 22 and the touch driving circuit 23 supply a first common voltage Vc1 to the plurality of common electrodes 101 through the data selecting circuit 24.

In addition, the signal on the pixel electrode 103 of the pixel point 11 at which the image display is held becomes a signal modulated by the modulation signal MGND by the capacitive coupling action. Therefore, the signals on the pixel electrode 103 and the common electrode 101 of each pixel 11 of the touch display panel 10 become signals synchronously modulated by the modulation signal MGND. Accordingly, the driving circuit 20 may simultaneously drive the common electrode 101 to perform touch sensing in any process of driving the touch display panel 10 to perform normal image display.

For example, when the scan driving circuit 28 provides the first scan-on signal Vg1 to a scan line 281, the common voltage generating circuit 22 provides the first common voltage Vc1 to a part of the common electrodes 101 for image display, and the touch driving circuit 23 provides the first common voltage Vc1 to the rest of the common electrodes 101 for image display and self-capacitance touch sensing.

Compared with the existing touch display device of the Incell type that performs touch sensing by multiplexing the common electrode, the touch display device 1 of the present application synchronously modulates all signals of the touch display panel 10 by using the modulation signal MGND, so that the signal for driving the common electrode 101 to perform image display can be further used as a touch driving signal, and therefore, the driving circuit 20 can also perform self-capacitance touch sensing on the common electrode 101 when providing the first scan-on signal Vg1 to the scan line 281, and accordingly, the touch display device 1 does not have to be limited to driving the common electrode 101 to perform touch sensing at a row gap I and a frame gap, so that there is no technical problem that the time for performing touch sensing is not enough for a display device with improved display resolution. In addition, the touch display device 1 performs touch sensing in any process of displaying an image, and has no or little influence on normal display of the image.

It should be noted that the first common voltage Vc1 output by the driving circuit 20 to the plurality of common electrodes 101 is the same, and the first common voltage Vc1 is a signal that changes compared to the ground signal GND, so that the first common voltage Vc1 can be further used as a touch driving signal, and accordingly, the driving circuit 20 can further drive the common electrodes 101 to perform self-capacitance touch sensing while driving the common electrodes 101 to perform normal image display.

In addition, in the second period W2, the scan signal generating circuit 28a outputs the second scan on signal Vg3 and the second scan off signal Vg4 to the scan driving circuit 28, the scan driving circuit 28 correspondingly outputs the second scan on signal Vg3 and the second scan off signal Vg4 to the corresponding scan lines 281 under the control of the control circuit 25, and the data driving circuit 29 outputs the second gray scale voltage Vd2 to the data lines 291 to be supplied to the corresponding pixel electrodes 103 through the activated control switches 105. The common voltage generating circuit 22 supplies a second common voltage Vc2 to the plurality of common electrodes 101. Thereby, the touch display panel 10 is driven to perform image display.

For a liquid crystal display device, the second common voltage Vc2 is generally a constant voltage signal that is constant with respect to the ground signal GND, such as (-1) V. During a first period W1, the modulation signal MGND is, for example, a periodically varying signal with a frequency of, for example, 200KHZ and an amplitude of 1.8V, i.e., the first reference signal of the modulation signal MGND is 0V and the second reference signal is 1.8V. Accordingly, the first common voltage Vc1 is a signal in which a voltage signal of (-1) V and a voltage signal of 0.8V are alternately output.

It should be noted that, in fig. 7, only the modulation circuit 21 is shown to output the modulation signal MGND to the touch driving circuit 23, and the modulation circuit 21 is omitted to output the modulation signal MGND to other circuits with a ground terminal in the domain 90, such as the common voltage generation circuit 22, the scan signal generation circuit 28a, and so on, however, it is clear to those skilled in the art from the above description that the modulation circuit 21 is a circuit with a ground terminal to output the modulation signal MGND to other circuits with a ground terminal in the domain 90.

In some embodiments, the driving circuit 20 may not drive all the common electrodes 101 to perform self-capacitance touch sensing.

Referring to fig. 8 and 9 together, fig. 8 is an exploded schematic view of an embodiment of the touch display panel 10 shown in fig. 7. Fig. 9 is a schematic cross-sectional view of the touch display panel 10 shown in fig. 8. The touch display panel 10 includes a first substrate 106, a second substrate 107, and a display medium layer 108. The display medium layer 108 is a liquid crystal layer in this embodiment, but may alternatively be another display medium in other embodiments. The pixel electrodes 103 and the control switches 105 of the plurality of pixel points 11, the plurality of scan lines 281, and the plurality of data lines 291 are disposed on the second substrate 107. The display medium layer 108 and the plurality of common electrodes 101 are disposed between the first substrate 106 and the second substrate 107.

The first substrate 106 and the second substrate 107 are, for example, transparent insulating substrates. The transparent insulating substrate is, for example, a glass substrate, a thin film substrate, or the like.

The second substrate 107, and the pixel electrodes 103, the control switches 105, the plurality of scan lines 281, and the plurality of data lines 291 disposed on the second substrate 107 are generally collectively referred to as an Array (Array) substrate. In contrast, a color filter (not shown) is disposed on the first substrate 106 to realize color image display. The first substrate 106 and the Color Filter are generally referred to as a Color Filter (CF) substrate. The side of the first substrate 106 facing away from the second substrate 107 is used for image display and receiving touch sensing. However, alternatively, the color filter may be disposed on the second substrate 107. In some types of display devices, the color filter may be omitted, and alternatively, light sources of three colors of red, green, and blue may be used for light emission. In addition, for display devices of different types, the side of the second substrate 107 opposite to the first substrate 106 can also be used for image display and receiving touch sensing. The touch display panel 10 may be a double-sided touch display panel. The present invention is not particularly limited as to whether the touch display panel 10 is a single-sided touch display panel or a double-sided touch display panel.

Preferably, the plurality of common electrodes 101 are disposed between the display medium layer 108 and the second substrate 107. In this embodiment, the plurality of common electrodes 101 are located between the display medium layer 108 and the plurality of pixel electrodes 103. For example, the plurality of common electrodes 101 are located in the same layer, and the plurality of pixel electrodes 103 are located in the same layer, which are stacked. In addition, since the touch display device 1 is exemplified by a liquid crystal display device, accordingly, the liquid crystal display device is a Fringe Field Switching (FFS) type liquid crystal display device. Slits 101a are provided in the plurality of common electrodes 101, respectively. Thereby forming a fringe electric field with the pixel electrode 103. In this embodiment, the plurality of pixel electrodes 103 may be provided with no slits but with a single electrode, but alternatively, the plurality of pixel electrodes 103 may be provided with slits to increase the fringe field intensity.

Referring to fig. 10 and 11 together, fig. 10 is a schematic cross-sectional structure diagram of another embodiment of the touch display panel 10 shown in fig. 7. Fig. 11 is a schematic top view of the touch display panel 10 shown in fig. 10. The plurality of common electrodes 101 may also be disposed between the pixel electrodes 103 and the second substrate 107. The plurality of common electrodes 101 and the plurality of pixel electrodes 103 are stacked. Slits 103a are respectively disposed on the plurality of pixel electrodes 103 to form a fringe electric field with the common electrode 101. In this embodiment, the plurality of common electrodes 101 may be provided with no slits but with one integral electrode, but alternatively, the plurality of common electrodes 101 may be provided with slits to increase the fringe field intensity.

Alternatively, the touch display panel 10 may be an In-Plane Switching (IPS) liquid crystal display panel, or the touch display panel 10 may be a Twisted Nematic (TN) liquid crystal display panel, or the touch display panel 10 may be any other suitable type of display panel.

Referring to fig. 1 and fig. 3 again, the electronic device 100 further includes a main control chip 3. The main control chip 3 is connected with the touch display device 1. The main control chip 3 is used for data communication with the touch display device 1. The main control chip 3 is further configured to provide a power voltage to the touch display device 1. The main control chip 3 may be a single chip or a chip set. When the main control chip 3 is a chipset, the chipset includes an Application Processor (AP) and a power chip. In addition, the chipset may further include a memory chip. Further, the application processor may also be a Central Processing Unit (CPU).

The main control chip 3 includes a power supply terminal 31 and a ground terminal 33. The power supply end 31 is connected to the driving circuit 20 and is used for supplying power to the driving circuit 20. The ground terminal 33 is connected to the device ground and receives a ground signal GND from the device ground. In the first period W1 and the second period W2, the main control chip 3 is referenced to the ground signal GND.

The main control chip 3 provides, for example, display data and related control signals to the display driving circuit 20 a. The display driving circuit 20a correspondingly drives the touch display panel 10 to perform corresponding image display according to the signal provided by the main control chip 3. The main control chip 3 further provides power voltage signals (VDD1, VDD2) to the touch driving circuit 23 and the common voltage generating circuit 22. The touch driving circuit 23 provides a touch driving signal to the common electrode 101 to perform touch sensing, and the main control chip 3 receives a signal output from the signal processing circuit 26 and correspondingly controls whether the electronic device 100 performs a corresponding function. In addition, the main control chip 3 correspondingly controls the driving circuit 20 to drive the common electrode 101 to perform the timing of touch sensing by providing a control signal to the control circuit 25 and controlling the data selection circuit 24 through the control circuit 25, for example.

It should be noted that, in the first period W1, since the main control chip 3 is located in the domain 80 and the circuits such as the display driving circuit 20a and the touch driving circuit 23 are located in the domain 90, signal transmission between the main control chip 3 located in the domain 80 and the circuits such as the display driving circuit 20a and the touch driving circuit 23 located in the domain 90 needs to be processed by level conversion, for example, to meet the requirement of voltage withstanding of electronic components. In contrast, in the second period W2, if the signal transmission between the main control chip 3 and the display drive circuit 20a, the touch drive circuit 23, and the like needs to be subjected to the level shift processing, the level shift processing is performed, and if the signal transmission does not need to be subjected to the level shift processing, the level shift processing is not performed.

Referring to fig. 3, 12 and 13 together, fig. 12 is a block diagram of an embodiment of the signal processing circuit 26 shown in fig. 3. Fig. 13 is a schematic structural diagram of an embodiment of a signal processing unit 261 of the signal processing circuit 26 shown in fig. 12. The signal processing circuit 26 includes a plurality of signal processing units 261. Each signal processing unit 261 is correspondingly connected to an operational amplifier 231, and is configured to process and calculate the sensing signal output from the operational amplifier 231 to obtain touch information.

The signal processing unit 261 includes an analog-to-digital signal conversion unit 263 and a calculation unit 265. The analog-to-digital signal conversion unit 263 performs analog-to-digital conversion on the signal output from the second output terminal g2 of the operational amplifier 231 and outputs the converted digital signal to the calculation unit 265. The calculation unit 265 calculates and obtains touch coordinates according to the digital signal. The computing unit 265 is connected to the main control chip 3, and is configured to output a signal representing a touch coordinate to the main control chip 3. The main control chip 3 correspondingly controls the electronic device 100 to execute a corresponding function according to the signal representing the touch coordinate.

The configuration of the signal processing circuit 26 is not limited to the configuration shown in fig. 12, and for example, a signal processing unit 261 may be shared by a plurality of operational amplifiers 231, instead of connecting a signal processing unit 261 to each operational amplifier 231.

In addition, it is also possible to add a corresponding circuit block or omit a part of the circuit blocks to the operational amplifier 231 and the signal processing unit 261, or it is also possible to realize the same function by using other circuit blocks or circuit units. Specifically, for example, a filtering unit is further included between the analog-to-digital signal converting unit 263 and the second output terminal g2, and the filtering unit performs filtering processing on the signal output by the second output terminal g2 and then outputs the filtered signal to the analog-to-digital signal converting unit 263.

For another example, a level conversion unit 264 may be further disposed between the calculation unit 265 and the analog-to-digital signal conversion unit 263, where the level conversion unit 264 is configured to perform level conversion on the digital signal output by the analog-to-digital signal conversion unit 263 and output the level-converted digital signal to the calculation unit 265. The calculation unit 265 calculates and obtains touch coordinates from the level-converted digital signal. For another example, the calculating unit 265 and the level converting unit 264 exchange positions, and accordingly, the analog-digital signal converting unit 263 outputs the converted digital signal to the calculating unit 265. The calculating unit 265 calculates and obtains a touch coordinate according to the digital signal, and outputs a signal representing the touch coordinate to the level converting unit 264, and the level converting unit 264 performs level conversion on the received signal representing the touch coordinate and then outputs the signal to the main control chip 3, which is also possible and needs to be determined according to the withstand voltage conditions of the calculating unit 265 and the analog-digital signal converting unit 263.

Referring to fig. 14, fig. 14 is a schematic structural diagram of another embodiment of the electronic device 100. The touch display panel 10 may further include a grounding element, such as a grounding line L1. The ground line L1 is provided around the plurality of pixel points 11, for example. However, the grounding element is not limited to the grounding line L1. In addition, the scan driving circuit 28 may be integrated on the touch display Panel 10(Gate In Panel, GIP), and accordingly, the grounding element may also be a grounding element In the scan driving circuit 28. The ground line L1 may be omitted in other embodiments.

The driving circuit 20 may further include a first ground terminal 201 and a second ground terminal 203. The modulation circuit 21 is connected between the first ground terminal 201 and the second ground terminal 203. The first ground terminal 201 is connected to a ground element on the touch display panel 10, and in the present embodiment, the first ground terminal 201 is connected to the ground line L1. The second ground terminal 203 is connected to the device ground and receives a ground signal GND. In a first period W1, the modulation circuit 21 outputs the modulation signal MGND to the touch display panel 10 through the first ground terminal 201; in the second period W2, the modulation circuit 21 outputs the ground signal GND to the touch display panel 10 through the first ground terminal 201.

The driving circuit 20 may further include a slope controller 204, for example, the slope controller 204 is connected to the modulation circuit 21, and is configured to control a slope of the modulation signal output by the modulation circuit 21 to reduce electromagnetic interference (EMI). The slope controller 204 is provided in the domain 80 with reference to GND, for example. However, in other embodiments, the slope controller 204 may be omitted.

The driving circuit 204 may further include a display processing circuit 205. The display processing circuit 205 is connected between the main control chip 3 and the level shift unit 264. The level shift unit 264 is further connected to the control circuit 25. The display processing circuit 205 is configured to perform corresponding processing (e.g., storing, decompressing, color adjusting, etc.) on the display data from the main control chip 3. The level conversion unit 264 is disposed between the display processing circuit 205 and the control circuit 25, and is configured to perform level conversion on the display data processed by the display processing circuit 205 and output the level-converted display data to the control circuit 25. The control circuit 25 outputs corresponding display data and timing signals to the display driving circuit 20 a. The display driving circuit 20a converts the received display data into gray scale voltages, and outputs a first gray scale voltage Vd1 to the corresponding pixel electrode 103 for performing an image display refresh in a first period W1 and outputs a second gray scale voltage Vd2 to the corresponding pixel electrode 103 for performing an image display refresh in a second period W2 according to the timing signal. The display data is preferably a digital signal.

It should be noted that, in the second period W2, when the modulation ground scheme is not adopted, if the signal between the display processing circuit 205 and the control circuit 25 does not need level conversion, the signal between the display processing circuit 205 and the control circuit 25 may not be subjected to level conversion, but in the first period W1, in the modulation ground scheme, since the voltage reference bases of the domain 80 and the domain 90 are different, level conversion is needed.

Similarly, in the second period W2, if the signal between the calculating unit 265 and the analog-to-digital signal converting unit 263 does not need level conversion, the signal between the calculating unit 265 and the analog-to-digital signal converting unit 263 may not be level-converted, but in the first period W1, since the voltage reference of the domain 80 and the domain 90 are different, level conversion is needed.

Correspondingly, the level shift unit 264 may control whether the first period W1 and the second period W2 correspond to level shifting of the corresponding signals, for example, by providing a switch switching element. However, the switch switching element or other suitable circuit structure may be disposed outside the level shifting unit 264.

In the present embodiment, the two

domains

80 and 90 are divided into circuit blocks or circuit units in the driving circuit 20: the display drive circuit 20a, the touch drive circuit 23, a part of the signal processing circuit 26 (the operational amplifier 231, the analog-digital signal conversion unit 263), the data selection circuit 24, and the control circuit 25 are all divided into a domain 90 with MGND as a reference, and the touch display panel 10 is also divided into the domain 90; the modulation circuit 21, the display processing circuit 205, the calculation unit 265, the voltage generation circuit 27, and the slope controller 204 are all divided in a domain 80 with GND as a reference; the level shift unit 264 spans two domains, i.e., a part in the domain 80 and a part in the domain 90, and for those skilled in the art, it can be determined that the level shift unit 264 is located in the domain 80 and the domain 90 respectively according to the description of the present application and the circuit principle, and details thereof are not repeated here.

It should be noted that the above-mentioned division of each circuit module or circuit unit in the driving circuit 20 in the two

domains

80 and 90 mainly corresponds to a splitting scheme of the control chip 51 and the driving chip 53 to be disclosed later, so as to save the manufacturing cost, and refer to the electronic device 200 (see fig. 17) in the following embodiment.

Alternatively, the present invention may be applied to the division of the driving circuit 20 into the two

domains

80 and 90 in other suitable manners, and is not limited to the division described in the above embodiments.

It should be further noted that the signal output from the domain 80 to the domain 90 is modulated by the modulation signal MGND, and correspondingly, the signal output from the domain 90 to the domain 80 is also modulated correspondingly, for example, the modulation opposite to the modulation signal MGND.

Since the signal of the touch display panel 10 during the execution of the touch sensing is modulated by the modulation signal MGND in a whole synchronization manner, the driving circuit 20 provides the common electrode 101 with the display driving signal for executing the image display, i.e., the common voltage, such as the second common voltage Vc2, which is modulated by the modulation signal MGND, and is then suitable for driving the common electrode 101 to execute the touch sensing, so that the common electrode 101 can be further driven to execute the touch sensing while the touch display panel 10 is ensured to execute the normal image display, and in addition, the signal-to-noise ratio of the touch display device 1 can be improved, and the touch sensing precision can be further improved.

Referring to fig. 14, in the present embodiment, in the first period W1, since a part of the driving circuit 20 is in the domain 80 based on GND and a part is in the domain 90 based on MGND, there is a possibility that the current in the domain 90 flows back to the domain 80, and in order to prevent this, the electronic device 100 may further include a protection circuit 15, and the protection circuit 15 is disposed between the domain 80 and the domain 90.

Specifically, the driving circuit 20 further includes a first power source terminal 206 and a second power source terminal 207. Wherein the first power supply terminal 206 is located in the domain 90. The second power end 207 is connected to the power supply end 31 of the main control chip 3. The main control chip 3 outputs a power supply voltage to the second power supply terminal 207 through the power supply terminal 31. The protection circuit 15 is connected between the second power terminal 207 and the first power terminal 206.

When the modulation signal MGND is a driving signal (i.e., a second reference signal), the protection circuit 15 correspondingly disconnects the first power terminal 206 from the second power terminal 207; when the modulation signal MGND is the ground signal GND (i.e., the first reference signal), the protection circuit 15 correspondingly closes the connection between the first power supply terminal 206 and the second power supply terminal 207.

Referring to fig. 15, fig. 15 is a circuit structure diagram of an embodiment of the protection circuit 15. In the present embodiment, the protection circuit 15 includes a diode J1. The anode of the diode J1 is connected to the second power supply terminal 207, and the cathode of the diode J1 is connected to the first power supply terminal 206.

Optionally, the protection circuit 15 further includes a first capacitor Q1 and a second capacitor Q2. Wherein the first capacitor Q1 is connected between the anode of the diode J1 and the device ground loaded with the ground signal GND, and the second capacitor Q2 is connected between the cathode of the diode J1 and the modulation ground loaded with the modulation signal MGND. The first capacitor Q1 and the diode J1 are arranged in the domain 80, and the second capacitor Q2 is arranged in the domain 90.

The protection circuit 15 is not limited to the above embodiments, for example, please refer to fig. 16, and fig. 16 is a circuit structure diagram of another embodiment of the protection circuit 15. For the sake of clear distinction between the protection circuit 15 shown in fig. 15, the protection circuit shown in fig. 16 is denoted by 15 a. The protection capacitor 15a includes a third active switch 151 and a control unit 153. The third active switch 151 includes a control terminal K3, a first transmission terminal T5, and a second transmission terminal T6. The control terminal K3 of the third active switch 151 is connected to the control unit 153, the first transmission terminal T5 is connected to the second power terminal 207, and the second transmission terminal T6 is connected to the first power terminal 206. When the modulation signal MGND is a driving signal, the control unit 153 controls the third active switch 151 to be turned off, and the protection circuit 15a correspondingly disconnects the first power terminal 206 from the second power terminal 207; when the modulation signal MGND is the ground signal GND, the control unit 153 controls the third active switch 151 to be turned on, and the protection circuit 15a correspondingly closes the connection between the first power terminal 206 and the second power terminal 207. The third active switch 151 is, for example, a thin film transistor, a triode, or a metal oxide semiconductor field effect transistor.

In addition, optionally, the protection circuit 15a further includes a first capacitor Q1 and a second capacitor Q2. The first capacitor Q1 is connected between the first transmission terminal T5 and the device ground loaded with the ground signal GND, and the second capacitor Q2 is connected between the second transmission terminal T6 and the modulation ground loaded with the modulation signal MGND.

Alternatively, in other embodiments, the modulation circuit 21 may modulate the power supply or the reference power in the driving circuit 20 to achieve overall synchronous modulation of all signals of the touch display panel 10, without limiting the device to be modulated. For example, the modulation terminal M of the modulation circuit 21 may be connected or used as the aforementioned first power terminal 206 (when modulating the power supply) in addition to being connected or used as the aforementioned first ground terminal 201 (when modulating the ground). When connected or used as the first power supply terminal 206, the modulation circuit 21 is connected between the first power supply terminal 206 and the second power supply terminal 207. The first power supply terminal 206 is also referred to as a power supply terminal with respect to the first ground terminal 201, and the voltages applied to both are kept constant.

In addition, the driving circuit 20 generally includes a reference power terminal (not shown) in addition to the first power terminal 206 and the first ground terminal 201, and the reference power terminal is used for loading a third power voltage when the first power terminal 206 is used for loading a first power voltage and the first ground terminal 201 is used for loading a second power voltage, the third power voltage being higher or lower than the first power voltage and the second power voltage, wherein a voltage difference between the first power voltage and the second power voltage is kept constant, and a voltage difference between the first power voltage and the third power voltage is kept constant. The reference power terminal may also be used as or connected to the modulation terminal. That is, one of the power supply terminal, the reference power terminal, and the first ground terminal serves as or is connected to the modulation terminal, and correspondingly, the power supply voltage serving as or connected to the modulation terminal includes a modulation signal.

Accordingly, in the second period W2, the modulation terminal M is loaded with a constant voltage, the driving circuit 20 provides the second gray scale voltage Vd2 to the pixel electrode 103, provides the second common voltage Vc2 to the common electrode 101, and drives the touch display panel 10 to perform image display; in a first period W1, the modulation terminal M loads a modulation signal, the driving circuit 20 provides a first grayscale voltage Vd1 to the pixel electrode 103, and provides a first common voltage Vc1 to the common electrode 101, and the common electrode 101 is further driven to perform self-capacitance touch sensing while the touch display panel 10 is driven to perform image display.

Typically, the touch driving circuit 23 is formed in a chip; the display driving circuit 20a is formed in one chip; for small-sized products, the control circuit 25 is generally formed in the same chip as the display drive circuit 20a, and for large-sized products, the control circuit 25 alone is formed as one chip; the display processing circuit 205 is either formed in a different chip or is formed in a chip. The modulation circuit 21 is typically provided in one chip.

Taking the touch driving circuit 23 formed in a touch driving chip as an example, the circuit in the touch driving circuit 23 includes both a digital circuit and an analog circuit, and the digital circuit and the analog circuit are formed in a chip without distinction, which results in higher manufacturing cost.

More specifically, each chip has a minimum feature line width. The characteristic line width refers to the length of a transistor gate. Generally, the smaller the minimum feature line width, the smaller the chip area, but the higher the manufacturing cost, but as the minimum feature line width of the chip becomes smaller, the smaller the analog circuit area is, the higher the digital circuit area is, and even after the minimum feature line width of the chip reaches a certain value, even if the minimum feature line width becomes smaller again, the analog circuit area does not become smaller, the digital circuit area becomes correspondingly smaller, but the cost still becomes higher. Therefore, the current approach of forming the touch driving circuit 23 on a chip with a smaller feature line width generally results in higher manufacturing cost.

Similarly, the same or similar technical problems exist in the chips of the display driving circuit 20a, the display processing circuit 205 and the control circuit 25.

The inventors have found the above problems through extensive research and have proposed technical ideas to solve the technical problems and corresponding technical means.

The driving circuit 20 is mainly formed in different chips according to the division of the digital circuit and the analog circuit, for example, the digital circuit is mainly formed in the control chip, the analog circuit is mainly formed in the driving chip, so that the area of the control chip is relatively reduced and the cost of the driving chip is relatively reduced by adopting different minimum feature line width processes, and further the purpose of saving the manufacturing cost is achieved on the whole.

Accordingly, several solutions are proposed:

firstly, the method comprises the following steps: the touch driving circuit 23 is formed in a control chip and a driving chip;

secondly, the method comprises the following steps: the display driving circuit 20a and the display processing circuit 205 are formed in a control chip and a driving chip;

for the first and second cases, the control circuit 25 shared by the touch driving circuit 23 and the display driving circuit 20a is formed either in the driving chip of the first case or in the driving chip of the second case, preferably in the driving chip of the second case.

Thirdly, the method comprises the following steps: the touch driving circuit 23, the control circuit 25, the display driving circuit 20a, and the display processing circuit 205 are formed in a control chip and a driving chip. The third embodiment is preferred in the present invention to save cost and reduce the area of the chip as much as possible to the maximum.

The control chip mainly comprises a digital circuit, and the driving chip mainly comprises an analog circuit. It should be noted that the control chip includes a small part of an analog circuit. The driving chip comprises a small part of digital circuit. The control chip preferably includes circuit elements having a low withstand voltage, but may include a small number of circuit elements having a high withstand voltage; the driver chip preferably includes circuit elements having a high withstand voltage, but may include a small portion of circuit elements having a low withstand voltage.

The minimum characteristic line width of the control chip is smaller than that of the driving chip.

The modulation circuit 21 is preferably formed in the control chip due to the modulation technique employed.

Because the circuits are respectively formed in different chips by correspondingly adopting different manufacturing processes with the minimum characteristic line width according to the type and the voltage resistance of the circuits, the manufacturing cost of products can be reduced.

Accordingly, the electronic apparatus 200 of the following embodiment is proposed.

Referring to fig. 17 and 18 together, fig. 17 is a schematic structural diagram of an electronic device according to still another embodiment of the present invention. Fig. 18 is a schematic diagram of an embodiment of a partial circuit structure of the electronic device shown in fig. 17. The structure and the operation principle of the electronic device 200 are substantially the same as or similar to those of the electronic device 100 of the foregoing embodiments, and the driving circuits 20 are correspondingly formed in a plurality of chips to save the product cost mainly based on the technical problems found out above. The electronic device 200 includes a touch display device 5 and a main control chip 3. The touch display device 5 includes a touch display panel 10, a control chip 51, and a driving chip 53. The control chip 51 is connected between the main control chip 3 and the driving chip 53, and the driving chip 53 is further connected to the touch display panel 10.

The control chip 51 is configured to provide the modulation signal MGND to the driving chip 53, and the driving chip 53 synchronously modulates all electrical signals of the touch display panel 10 by using the modulation signal MGND. The driving chip 53 provides the same first common voltage Vc1 to the plurality of common electrodes 101 to perform image display, and further drives the common electrodes 101 to perform touch sensing. The first common voltage Vc1 is a signal modulated by the modulation signal MGND, and may be used as a touch driving signal in addition to a display driving signal. In particular, when the driving chip 53 drives the touch display panel 10 to perform image display refresh, the common electrode 101 may also be driven to perform touch sensing.

Since the driving chip 53 can simultaneously drive the touch display panel 10 to perform touch sensing in any process of driving the touch display panel 10 to perform image display, the touch sensing time is not affected even if the display resolution of the touch display device 5 is improved. Accordingly, the user experience of the electronic device 200 is better.

Further, since the driving chip 53 includes both the display driving circuit portion and the touch driving circuit portion, and the display driving circuit portion and the touch driving circuit portion are mainly analog circuits, the control chip 51 includes the modulation circuit 21, and the modulation circuit 21 is mainly a digital circuit, the control chip 51 and the driving chip 53 can be manufactured by using different semiconductor processes with minimum feature line widths, thereby reducing the manufacturing cost.

Preferably, the minimum feature line width of the control chip 51 is smaller than the minimum feature line width of the driving chip 53.

The driving chip 53, for example, simultaneously provides the modulated first common voltage Vc1 to the plurality of common electrodes 101 to perform image display, and receives the touch sensing signals output from the common electrodes 101 in a time-sharing manner to acquire touch information. That is, the driving chip 53 simultaneously drives the plurality of common electrodes 101 to perform graphic display, and time-divisionally drives the plurality of common electrodes 101 to perform touch sensing.

However, alternatively, in some embodiments, the driving chip 53 may also simultaneously drive the plurality of common electrodes 101 to perform image display and self-capacitance touch sensing.

Preferably, the driving chip 53 drives the plurality of common electrodes 101 in a time-sharing manner to perform touch sensing, so that connecting pins between the driving chip 53 and the plurality of common electrodes 101 are reduced, and thus, the area of the driving chip 53 is reduced, the cost is saved, and the space occupied by the electronic device 200 is also reduced.

The driving chip 53 time-divisionally drives the plurality of common electrodes 101 by rows or columns, for example, to perform touch sensing. Specifically, the driving chip 53 time-divisionally drives the plurality of common electrodes 101 to perform touch sensing, for example, row by row or column by column.

In order to save power consumption, the driving chip 53 further drives the plurality of common electrodes 101 to perform touch sensing, for example, in an intermittent driving manner.

Accordingly, the driving chip 53 drives the plurality of common electrodes 101 to perform touch sensing in an intermittent and time-sharing driving manner, for example, so as to achieve the technical effects of reducing cost and saving power consumption.

However, alternatively, in some embodiments, the driving chip 53 may also continuously drive the plurality of common electrodes 101 to perform touch sensing during the operation of driving the touch display panel 10.

In this embodiment, a mode in which the driving chip 53 drives the plurality of common electrodes 101 at predetermined time intervals or intermittently in a time-sharing manner to perform touch sensing will be described as an example.

Referring to fig. 2 and fig. 3 together, in the first period W1, the driving chip 53 provides a first signal to the touch display panel 10 to simultaneously perform image display and self-capacitance touch sensing; in the second time period W2, the driving chip 53 provides a second signal to the touch display panel 10 to perform image display, wherein the second signal is the first signal through the modulation signal MGND.

Specifically, in the first period W1, the driving chip 53 supplies the first common voltage Vc1 to the plurality of common electrodes 101 to perform image display, and time-divisionally drives the plurality of common electrodes 101 to perform self-capacitance touch sensing. In the second period W2, the driving chip 53 supplies the second common voltage Vc2 to the plurality of common electrodes to perform image display. The first common voltage Vc1 is, for example, the second common voltage Vc2 modulated by the modulation signal MGND.

Further, in the first period W1, the driving chip 53 may further provide a first scan-on signal Vg1 to the scan line 281 to activate the control switch 105 connected to the scan line 281, and provide a first gray-scale voltage Vd1 to the pixel electrode 103 through the plurality of data lines 291 and the activated control switch 105, provide a first common voltage Vc1 to the plurality of common electrodes 101, and receive a touch sensing signal from the common electrode 101, thereby implementing driving of the touch display panel 10 to simultaneously perform image display and self-capacitance touch sensing.

In the second period W2, the driving chip 53 may further provide a second scan-on signal Vg3 to the scan lines 281 to activate the control switches 105 connected to the scan lines 281, and provide a second gray scale voltage Vd2 to the pixel electrodes 103 and a second common voltage Vc2 to the common electrodes 101 through the data lines 291 and the activated control switches 105, thereby implementing driving of the touch display panel 10 to perform image display.

It should be noted that, when the scan driving circuit 28 is integrated in the driving chip 53, the driving chip 53 correspondingly provides the first scan-on signal Vg1 or the second scan-on signal Vg3 to the scan line 281. However, when the scan driving circuit 28 is integrated on the touch display Panel 10(Gate In Panel, GIP), the control circuit 25 In the driving chip 53 correspondingly provides a corresponding timing signal to the scan driving circuit 28, and the scan signal generating circuit 28a of the display driving circuit 20a In the driving chip 53 correspondingly provides a first scan-on signal Vg1, a second scan-on signal Vg3, a first scan-off signal Vg2, and a second scan-off signal Vg4 to the scan driving circuit 28. The scan driving circuit 28 outputs a scan on signal and a scan off signal to the corresponding scan lines 281 according to the timing signal of the control circuit 25.

The driving chip 53 performs, for example, analog-to-digital conversion processing on the touch sensing signal output from the common electrode 101, and outputs a processed signal related to the touch sensing signal to the control chip 51.

Accordingly, the driving chip 53 includes, for example, a control circuit 25, the display driving circuit 20a, the touch driving circuit 23, and an analog-digital signal conversion unit 263. However, as mentioned above, the scan driving circuit 28 of the display driving circuit 20a can also be integrated on the touch display panel 10, and is not limited to be integrated in the driving chip 53. The control chip 51 further includes, for example, a level conversion unit 264 and a calculation unit 265. The level shifter 264 performs level shifting on the touch sensing signal from the driving chip 53 and outputs the level-shifted touch sensing signal to the calculation unit 265. The calculation unit 265 calculates a touch coordinate according to the level-converted touch sensing signal, and outputs a signal indicating the touch coordinate to the main control chip 3. The main control chip 3 correspondingly controls the electronic device 200 to execute corresponding functions according to the received signals representing the touch coordinates.

The control chip 51 may further include, for example, a voltage generation circuit 27 and a slope controller 204.

The control chip 51 may further include, for example, a display processing circuit 205a, a first high-speed transmission interface H1, and a second high-speed transmission interface H2. Correspondingly, the main control chip 3 further includes a first high-speed transmission interface H0. The driving chip 53 further includes a decompression circuit 530 and a second high-speed transmission interface H3. The first high-speed transmission interface H0 is connected with the first high-speed transmission interface H1. The display processing circuit 205a is connected between the first high speed transmission interface H1 and the level shift unit 264. The second high speed transmission interface H2 is connected with the second high speed transmission interface H3. The decompression circuit 530 is connected between the second high-speed transmission interface H3 and the control circuit 25.

The first high-speed transmission interfaces H0, H1 and the second high-speed transmission interfaces H2, H3 are used for transmitting signals such as display data. The instantaneous speed of the data transmission of the first high-speed transmission interfaces H0 and H1 is greater than that of the second high-speed transmission interfaces H2 and H3.

Preferably, the instant speed of the main control chip 3 outputting the display data to the control chip 51 is greater than the instant speed of the control chip 51 outputting the display data to the driving chip 53, so as to meet the working requirements of the control chip 51 and the driving chip 53 manufactured by different processes with minimum feature line widths, thereby reducing the product cost.

For the touch related data, the control chip 51, the driving chip 53, and the main control chip 3 may adopt an I2C (Inter-Integrated Circuit) interface for transmission, for example.

The display processing circuit 205a includes, for example, a storage circuit 2051, a decompression circuit 2053, a color adjustment circuit 2055, and a compression circuit 2057. The memory circuit 2051, the decompression circuit 2053, the color adjustment circuit 2055, and the compression circuit 2057 are coupled. The storage circuit 2051 is further connected to the main control chip 3 through the first high-speed transmission interface H1. The compression circuit 2057 is further connected to the second high speed transmission interface H2 through the level shift unit 264.

The storage circuit 2051 is configured to receive the display data from the main control chip 3 through the first high-speed transmission interface H1, and store the received display data. The decompression circuit 2053 is configured to decompress the display data from the main control chip 3 and output the compressed display data to the color adjustment circuit 2055. The color adjustment circuit 2055 performs color adjustment on the received display data, for example, performs color enhancement processing or the like on the display data, and outputs the adjusted display data to the compression circuit 2057. The compression circuit 2057 performs compression processing on the received display data and outputs the compressed display data to the level conversion unit 264. The level conversion unit 264 performs level conversion on the received display data, and outputs the level-converted display data to the decompression circuit 530 in the driver chip 53 through the second high-speed transmission interface H2.

The decompression circuit 530 decompresses the received display data and outputs the decompressed display data to the control circuit 25. The control circuit 25 outputs the corresponding display data and timing signals to the data driving circuit 29, and further outputs the timing signals to the scan driving circuit 28. The scan driving circuit 28 correspondingly outputs a corresponding scan start signal to the scan line 281 according to the timing signal. The data driving circuit 29 converts the received display data into gray scale voltages and outputs the corresponding gray scale voltages to the corresponding data lines 291 according to the timing signals, so as to perform image display refresh.

The display processing circuit 205a outputs the compressed display data to the driving chip 53, and the decompression circuit 530 of the driving chip 53 decompresses the received display data, so that the data transmission requirements of different instant speeds between the control chip 51 and the driving chip 53 can be met, the working performance of the product is ensured, and the manufacturing cost of the product is reduced.

Accordingly, the display processing circuit 205a according to the present embodiment may be different from the display processing circuit 205 according to each of the embodiments, and the display processing circuit 205 according to each of the embodiments may output the decompressed display data without compressing the display data. However, the display processing circuit 205 of each of the foregoing embodiments may also output compressed display data, similarly to the display processing circuit 205a of the present embodiment, and accordingly, the driving circuit 20 further includes the decompression circuit 530 between the level conversion circuit 264 and the control circuit 25.

It should be noted that the display processing circuits 205a and 205a are not limited to include the circuits described herein, and some of the circuits may be omitted or other circuits may be further included.

In addition, in this embodiment, the main control chip 3 outputs display data to the memory circuit 2051 first, and the decompression circuit 2053 retrieves the display data from the memory circuit 2051 and performs decompression processing. However, alternatively, in other embodiments, the main control chip 3 outputs the display data to the decompressing circuit 2053 first, and the decompressing circuit 2053 decompresses the display data and then stores the decompressed display data in the storage circuit 2051; or, the main control chip 3 may output the display data to the storage circuit 2051, and after the decompression circuit 2053 decompresses the display data, the decompressed display data may be stored in the storage circuit 2051. Therefore, the present invention does not particularly limit the data transmission method among the memory circuit 2051, the decompression circuit 2053, and the main control chip 3.

It can be seen that the control circuit 25, the common voltage generation circuit 22, the scan signal generation circuit 28a, the data driving circuit 29, and portions of the touch driving circuit 23 can all be integrated in the same chip, i.e., the driving chip 53. Thus, the integration of the chip is improved, and the manufacturing cost of the chip is reduced.

Further, similarly to the above, it is also possible to add corresponding circuit modules or omit part of circuit units in the control chip 51 and the driving chip 53, respectively, or it is also possible to adopt other circuit modules or circuit units to achieve the same function. Accordingly, mainly according to the classification of digital circuits or analog circuits, and the combination of high-voltage circuits and low-voltage circuits, corresponding circuit modules or circuit units are respectively formed in the driving chip 53 and the control chip 51, wherein the driving chip 53 is more suitable for high-voltage circuits, but for example, low-voltage circuits but analog circuits may also be provided in the driving chip 53. The boundary between low and high pressure can be measured in 5V, with high pressure at or above 5V and low pressure below 5V. The negative voltage may be defined by (-5) V, a low voltage ranging from 0V to (-5) V, a high voltage ranging from (-5) V to (-5) V, or a high voltage lower than (-6) V. However, 5V, (-5) V are two examples, and this threshold may be different for different products. The basic idea of this embodiment of the present invention is to form different types of circuits by using chips with different minimum feature line widths according to the types of circuit elements and voltage resistance, so as to save the manufacturing cost of the product.

Specifically, for example, a filtering unit is further included between the analog-to-digital signal conversion unit 263 and the touch driving circuit 23, and the filtering unit performs filtering processing on the touch sensing signal output by the touch driving circuit 23 and then outputs the filtered touch sensing signal to the analog-to-digital signal conversion unit 265. The filter unit is provided in the drive chip 53, for example.

Furthermore, the control chip 51 further includes a non-volatile memory (not shown), such as a Flash memory, for storing the program codes. Alternatively, the non-volatile memory may be a separate chip connected to the control chip 51.

The specific working principle of the control chip 51 and the driving chip 53 is similar to or the same as that of the driving circuit 20, and is not described herein again.

Further, the

aforementioned protection circuit

15 or 15a is further included between the control chip 51 and the driving chip 53. It should be noted that, for the protection circuit 15, since the diode J1 and the first and second capacitors Q1, Q2 are discrete components, they do not need to be formed in the control chip 51 and the driving chip 53, however, for the protection circuit 15a, the control unit 153 and the third active switch 151 may be preferably formed in the control chip 51, and the first and second capacitors Q1, Q2 do not need to be formed in the control chip 51 and the driving chip 53.

Since the circuit formed in the control chip 51 is mainly a digital circuit and the circuit formed in the driving chip 53 is mainly an analog circuit, the control chip 51 and the driving chip 53 can be manufactured by using different processes with minimum feature line widths, thereby reducing the product cost.

It should be noted that the division of the driving circuit 20 between the control chip 51 and the driving chip 53 may be in other suitable manners, and is not limited to the above embodiment, and some circuits in the driving circuit 20 may be integrated into neither the control chip 51 nor the driving chip 53, however, it is within the scope of the present invention to integrate the driving circuits 20 separately according to the difference between the analog circuit and the digital circuit, the withstand voltage, and the like.

Further, the operation principle of the electronic device 200 is similar to that of the electronic device 100, and is not described herein again.

In addition, some elements, combination circuits, and the like may be reduced or added to the

touch display devices

1 and 5 and the

electronic devices

100 and 200 according to the foregoing embodiments, and it is within the scope of the present application that a person having ordinary skill in the art can reasonably deduce the technical solutions through common knowledge and the prior art in combination with the technical contents of the present application.

In other embodiments, the common electrode 101 is, for example, an emitting electrode, the scan line 281 is, for example, a receiving electrode, a mutual capacitance is formed between the common electrode 101 and the scan line 281, and the driving circuit 20 and the driving chip 53 can also drive the touch display panel 10 to perform mutual capacitance touch sensing.

In other embodiments, with respect to the

touch display devices

1 and 5 and the

electronic apparatuses

100 and 200 of the foregoing embodiments, besides the driving circuit 20, the control chip 51, and the driving chip 53 may adopt a mode of synchronously modulating all signals of the touch display panel 10 by modulating the power supply or the reference power supply integrally to simultaneously drive the touch display panel 10 to perform image display and touch sensing, alternatively, when the

touch display devices

1 and 5 simultaneously perform image display and touch sensing, a non-modulation technical scheme such as a non-modulation mode or a non-modulation power supply or a non-modulation reference power supply may be adopted to drive, that is, the

electronic apparatuses

100 and 200 each use one field 80 with the ground signal GND as a voltage reference during operation.

Accordingly, when the

touch display devices

1 and 5 simultaneously perform image display and touch sensing, it is also possible that the driving circuit 20 or the driving chip 53 supplies the first common voltage Vc1 to the plurality of common electrodes 101, supplies the first scan-on signal Vg1, supplies the first scan-off signal Vg2 to the corresponding scan line 281, and supplies the first grayscale voltage Vd1 to the data line 291.

When the

touch display device

1, 5 performs image display rather than simultaneously performing touch sensing, the driving circuit 20 or the driving chip 53 supplies the second common voltage Vc2 to the plurality of common electrodes 101, the second scan-on signal Vg3, the second scan-off signal Vg4 to the corresponding scan line 281, and the second gray scale voltage Vd2 to the data line 291.

Although embodiments have been described herein with respect to particular configurations and sequences of operations, it should be understood that alternative embodiments may add, omit, or alter elements, operations, or the like. Accordingly, the embodiments disclosed herein are meant to be examples and not limitations.

Claims

1. A touch display device comprising:

a touch display panel including a plurality of common electrodes;

when the control chip outputs the modulation signal to the driving chip, the driving chip drives the touch display panel to simultaneously execute image display refreshing and touch sensing, wherein signals on the touch display panel are signals synchronously modulated by the modulation signal;

the driving chip provides the same first common voltage to the plurality of common electrodes, drives the plurality of common electrodes to perform image display, and further drives the common electrodes to perform touch sensing, wherein the first common voltage is a signal modulated by the modulation signal;

the driving chip comprises a common voltage generating circuit and a touch driving circuit, wherein the common voltage generating circuit is selectively connected with the plurality of common electrodes and is used for providing the first common voltage to the plurality of common electrodes to perform image display but not touch sensing, and the touch driving circuit is selectively connected with the plurality of common electrodes and is used for providing the first common voltage to the plurality of common electrodes to perform image display and self-capacitance touch sensing;

the driving chip further comprises a data selection circuit, the data selection circuit is respectively connected with the plurality of common electrodes, the common voltage generation circuit is selectively connected with the plurality of common electrodes through the data selection circuit, and the touch driving circuit is selectively connected with the plurality of common electrodes through the data selection circuit;

the driving chip circuit further comprises a first grounding end, the control chip further comprises a second grounding end and a modulation circuit, the modulation circuit is connected between the first grounding end and the second grounding end, the second grounding end is used for being connected with a device ground of an electronic device and receiving a grounding signal, and the modulation circuit is used for generating the modulation signal according to the grounding signal and a driving signal and outputting the modulation signal to the first grounding end;

the common voltage generating circuit includes:

the signal source comprises a grounding end and an output end, and the grounding end is connected with the first grounding end;

the follower is connected with the first grounding end, is selectively connected with the plurality of common electrodes through the data selection circuit and is used for transmitting the signal output by the signal source to the data selection circuit; and

the voltage stabilizing circuit is connected between the follower and the first grounding end and is used for stabilizing the voltage of the signal output by the follower;

the touch driving circuit includes:

the signal source; and

2. The touch display device of claim 1, wherein: when the driving chip drives the touch display panel to simultaneously execute image display refreshing and touch sensing, elements on the touch display panel are directly driven by the driving chip or indirectly driven by the driving chip.

3. The touch display device of claim 1, wherein: when the control chip outputs the modulation signal to the driving chip, the driving chip correspondingly outputs a signal modulated by the modulation signal to the touch display panel.

4. The touch display device of claim 1, wherein: the driving chip is used for driving the plurality of common electrodes in a time-sharing mode to execute self-capacitance touch sensing.

5. The touch display device of claim 1, wherein: the first common voltage is kept constant with respect to the modulation signal.

6. The touch display device of claim 1, wherein: when the touch driving circuit provides a first common voltage to a part of the common electrodes through the data selection circuit to perform image display and touch sensing, the common voltage generation circuit provides the first common voltage to all or part of the rest common electrodes to perform image display, wherein the first common voltage provided by the touch driving circuit to the common electrodes and the first common voltage provided by the common voltage generation circuit to the common electrodes are the same signal.

7. The touch display device of claim 1, wherein: the driving chip further comprises a control circuit which is connected with the data selection circuit, the data selection circuit is controlled through the control circuit, and the touch driving circuit is electrically connected with the plurality of common electrodes in a time-sharing mode.

8. The touch display device of claim 1, wherein: the data selection circuit comprises a first data selector and a plurality of second data selectors, wherein the common voltage generation circuit is selectively connectable with the plurality of common electrodes through the first data selector, the touch driving circuit is selectively connectable with the plurality of common electrodes through the plurality of second data selectors, and each second data selector is used for connecting part of common electrodes.

9. The touch display device of claim 8, wherein: the first data selector comprises a plurality of first output ports, each second data selector comprises a plurality of second output ports, each second output port is respectively connected with a common electrode, and each first output port of the first data selector is connected between the second output port and the common electrode.

10. The touch display device of claim 9, wherein: the plurality of first output ports of the first data selector are connected with the plurality of second output ports of each second data selector in a one-to-one correspondence manner, or the plurality of first output ports of the first data selector are connected with part of the second output ports of the second data selector, or the plurality of first output ports of the first data selector are connected with the plurality of second output ports of part of the second data selector in a one-to-one correspondence manner.

11. The touch display device of claim 9, wherein: the plurality of common electrodes are arranged in a plurality of rows and a plurality of columns, and a plurality of second output ports of a second data selector are respectively connected with the common electrodes in the same column or the same row.

12. The touch display device of claim 9, wherein: the plurality of common electrodes are arranged in multiple rows and multiple columns, the number of the second data selectors is the same as the number of columns of the plurality of common electrodes, the number of the second output ports of each second data selector is the same as the number of rows of the plurality of common electrodes, the second output ports of each second data selector are respectively connected with one column of common electrodes in a one-to-one correspondence manner, or the number of the second data selectors is the same as the number of rows of the plurality of common electrodes, the number of the second output ports of each second data selector is the same as the number of columns of the plurality of common electrodes, and the second output ports of each second data selector are respectively connected with one row of common electrodes in a one-to-one correspondence manner.

13. The touch display device of claim 1, wherein: the follower comprises a first amplifier, wherein the first amplifier comprises a third power supply end, a third grounding end, a first in-phase end, a first inversion end and a first output end, the third power supply end is used for loading power supply voltage, the third grounding end is connected with the first grounding end, the first in-phase end is connected with the output end of the signal source, the first inversion end is connected with the first output end, and the first output end is selectively connected with the plurality of common electrodes through a data selection circuit.

14. The touch display device of claim 13, wherein: each operational amplifier comprises a second amplifier and a feedback branch; the second amplifier comprises a fourth power supply end, a fourth grounding end, a second in-phase end, a second inverting end and a second output end, wherein the fourth power supply end is used for loading power supply voltage, the fourth grounding end is connected with the first grounding end, the second in-phase end is connected with the output end of the signal source, the second inverting end is connected with the second output end through a feedback branch, and the second inverting end is selectively connected with part of the common electrodes through a data selection circuit.

15. The touch display device of claim 14, wherein: when the modulation circuit outputs the modulation signal to the first grounding end, the signal source correspondingly outputs a first reference voltage signal modulated by the modulation signal to the first in-phase end and the second in-phase end, and the operational amplifier and the follower correspondingly output a first common voltage which is the same as the first reference voltage signal to the plurality of common electrodes through the data selection circuit.

16. The touch display device of any one of claims 1-15, wherein: the touch display panel further comprises a plurality of pixel electrodes, the driving chip is used for providing a first gray scale voltage to the pixel electrodes and providing a first common voltage to the plurality of common electrodes to drive the touch display panel to simultaneously execute image display refreshing and touch sensing, wherein the first gray scale voltage and the first common voltage are signals modulated by the modulation signal.

17. An electronic device comprising the touch display device of any one of claims 1-16.