CN209803752U

CN209803752U - Drive chip, touch display device, and electronic apparatus

Info

Publication number: CN209803752U
Application number: CN201790000300.7U
Authority: CN
Inventors: 林峰
Original assignee: Shenzhen Deep Minimally Invasive Core Technology Co Ltd
Current assignee: Huizhou Xili Technology Co ltd
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2019-12-17
Anticipated expiration: 2027-12-12
Also published as: WO2019113799A1

Abstract

the utility model provides a driver chip, touch display device and electronic equipment. The driving chip is used for driving the touch display panel to execute image display and touch sensing. The touch display panel includes a plurality of common electrodes. The driving chip comprises a modulation circuit which is used for generating a modulation signal and a constant voltage signal to the touch display panel in a time-sharing mode. When the modulation circuit outputs the modulation signal to the touch display panel, the voltage signals on the touch display panel are changed along with the change of the modulation signal, and the driving chip drives the touch display panel to execute image display refreshing and further drives the common electrode to execute self-capacitance touch sensing. When the modulation circuit outputs the constant voltage signal to the touch display panel, the driving chip drives the touch display panel to execute image display. The touch display device includes a driving chip. The electronic device includes a touch display device.

Description

Drive chip, touch display device, and electronic apparatus

Technical Field

The utility model relates to an integrated circuit technical field especially relates to a driver chip for driving touch display panel and carrying out image display and touch sensing.

Background

For touch display devices, especially those that perform touch sensing by multiplexing common electrodes, in order to reduce interference between touch sensing and image display refresh, manufacturers generally adopt the following approaches: and controlling the touch display panel to perform touch sensing and image display refreshing in a time-sharing manner. For example, in one embodiment, touch sensing is performed by driving the touch display panel during a line gap or frame gap of an image display.

However, as the resolution of the touch display panel is gradually improved, for example, the resolution of the liquid crystal display panel of a mobile phone gradually adopts 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 by driving 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 of the touch display device is increased to 120HZ, less time is available for touch sensing.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the present invention is to provide a driving chip, a touch display device, and an electronic apparatus capable of driving a touch display panel to simultaneously perform image display and touch sensing.

The utility model provides a driver chip for drive touch display panel carries out image display and touch sensing, touch display panel includes a plurality of common electrodes, driver chip includes:

The modulation circuit is used for generating a modulation signal and a constant voltage signal to the touch display panel in a time-sharing manner;

When the modulation circuit outputs the modulation signal to the touch display panel, the voltage signals on the touch display panel are changed along with the change of the modulation signal, and the driving chip drives the touch display panel to execute image display refreshing and further drives the common electrode to execute self-capacitance touch sensing;

when the modulation circuit outputs the constant voltage signal to the touch display panel, the driving chip drives the touch display panel to execute image display.

Since the driving chip can further drive the common electrode to perform self-capacitance touch sensing while driving the touch display panel to perform image display refresh, touch sensing can be performed for a longer time during performing image display refresh than touch sensing during line and frame gaps of image display. Therefore, even when the resolution of the touch display panel is improved, the time for the driving chip to drive the touch display panel to perform touch sensing is not affected or is less affected. Therefore, the use experience of the user is improved.

Optionally, the voltage signal on the touch display panel is based on the modulation signal and the constant voltage signal output by the modulation circuit.

Optionally, when the modulation circuit outputs the modulation signal to the touch display panel, the voltage signal on the touch display panel increases with the increase of the modulation signal and decreases with the decrease of the modulation signal.

Optionally, the touch display panel includes a ground line, and the modulation circuit is configured to be connected to the ground line and time-share supply the modulation signal and the constant voltage signal to the ground line.

Optionally, the driving chip includes a first ground terminal and a second ground terminal, the second ground terminal is configured to be connected to a device ground and receive a ground signal, and the modulation circuit is connected between the first ground terminal and the second ground terminal and configured to generate the modulation signal according to the ground signal and a driving signal and provide the modulation signal to the ground line and the first ground terminal.

Optionally, the modulation signal is a periodically varying square wave signal, and the square wave signal includes the ground signal and the driving signal.

Optionally, the constant voltage signal is the ground signal.

Optionally, the touch display panel further includes a plurality of common electrodes and a plurality of pixel electrodes, and the driving chip is configured to drive the touch display panel to perform image display refresh by providing a first grayscale voltage to the plurality of pixel electrodes and providing a first common voltage to the plurality of common electrodes, and further drive the common electrodes to perform self-capacitance touch sensing.

optionally, when the driving chip drives the touch display panel to simultaneously perform image display refresh and touch sensing, the common electrode for driving the driving chip to perform touch sensing and the pixel electrode for driving the driving chip to perform image display refresh are not overlapped.

Optionally, the driving chip drives a pixel electrode for performing image display hold at intervals of a plurality of rows between a common electrode for performing touch sensing and a pixel electrode for driving performing image display refresh.

Optionally, the driving chip further includes:

A common voltage generating circuit selectively connected to the plurality of common electrodes for driving the common electrodes to perform image display; and

The touch driving circuit is selectively connected with the plurality of common electrodes and is used for driving the same common electrode to simultaneously execute image display and touch sensing;

When the modulation circuit outputs the modulation signal to the first grounding end, the touch driving circuit is electrically connected with part of the common electrodes, and the common voltage generating circuit is electrically connected with the rest common electrodes;

When the modulation circuit outputs the constant voltage signal to the first ground terminal, the common voltage generation circuit is electrically connected to the plurality of common electrodes, respectively.

Optionally, when the modulation circuit outputs the modulation signal to the first ground, the touch driving circuit is configured to provide a touch driving signal to the part of the common electrodes to perform image display and touch sensing simultaneously, and the common voltage generation circuit is configured to provide a first common voltage to the remaining common electrodes to perform image display, where the first common voltage and the touch driving signal are signals obtained by modulating the same voltage signal with the modulation signal.

Optionally, the common voltage generating circuit includes a signal source, a follower, and a voltage regulator circuit, the follower is connected between the signal source and the voltage regulator circuit, and the follower is further selectively connectable to the plurality of common electrodes; the touch driving circuit comprises the signal source and a plurality of operational amplifiers, and the operational amplifiers are connected with the signal source and further can be selectively connected with the common electrodes;

When the modulation circuit outputs the modulation signal to the first ground terminal, the signal source outputs the first reference voltage signal to the follower and the operational amplifiers; the follower outputs a first common voltage which is the same as the first reference voltage signal to the corresponding common electrode, the voltage stabilizing circuit stabilizes the first common voltage, and the operational amplifiers output touch driving signals which are the same as the first reference voltage signal to the corresponding common electrode.

Optionally, the driving chip further includes a plurality of signal processing circuits, the plurality of signal processing circuits are connected to the plurality of operational amplifiers, the plurality of operational amplifiers are configured to receive a touch sensing signal output by the common electrode while outputting a touch driving signal to the common electrode, and the plurality of signal processing circuits obtain touch position information of a target object on the touch display panel according to the touch sensing signal, where voltage signals of the plurality of signal processing circuits are all based on the voltage signal of the first ground terminal.

Optionally, the driving chip further includes a level shift unit, where the level shift unit is connected to the plurality of signal processing circuits, and is configured to perform level shift on the touch position information output by the plurality of signal processing circuits.

optionally, the touch driving circuit and the common voltage generating circuit may be selectively connected to the plurality of common electrodes through a data selecting circuit.

Optionally, the data selection circuit is integrated in the driving chip.

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

The utility model also provides a touch display device, including any one of the aforesaid drive chip.

The utility model also provides an electronic equipment, including foretell touch display device.

Drawings

Fig. 1 is a schematic block diagram of the electronic device of the present application.

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 an embodiment of the electronic device shown in fig. 1.

FIG. 6 is an exploded view of one embodiment of the touch display panel shown in FIG. 5.

Fig. 7 is a schematic cross-sectional view of the touch display panel shown in fig. 6.

Fig. 8 is a schematic cross-sectional view of another embodiment of the touch display panel shown in fig. 5.

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

Fig. 10 is a block diagram of an embodiment of the signal processing circuit shown in fig. 3.

Fig. 11 is a schematic structural diagram of an embodiment of a signal processing unit of the signal processing circuit shown in fig. 10.

Fig. 12 is a schematic structural diagram of another embodiment of an electronic device according to the present application.

Fig. 13 is a circuit diagram of an embodiment of the protection circuit shown in fig. 12.

fig. 14 is a circuit configuration diagram of another embodiment of the protection circuit.

FIG. 15 is a diagram of one embodiment of the display processing circuit shown in FIG. 12.

Detailed Description

in order to make the aforementioned objects, features and advantages of the present invention more 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 give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may 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 general display device, the display device generally 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 typically includes a plurality of pixels, each pixel including a first electrode and a second electrode. 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, thereby realizing image display of different gray scales.

When the display device is a liquid crystal display device, the first electrode is generally referred to as a common electrode, and the second electrode is generally referred to as a pixel electrode. The driving circuit drives the liquid crystal display panel to execute image display refreshing by providing a common voltage to the first electrode and providing a gray scale voltage to the second electrode. Alternatively, the display device may also be other suitable types of display devices, such as an electronic paper display device (EPD), an organic electroluminescent diode display device (OLED), and the like. When the display device is an OLED, the first electrode may also be referred to as a cathode and the second electrode may also be referred to as an anode.

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.

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

The foregoing has described in advance the two different display states of image display refresh and image display retention, and is provided for a better understanding of the embodiments described below in the present application.

As described above, the names of the first electrode and the second electrode are different in different types of display devices, and the first electrode is referred to as a common electrode and the second electrode is referred to as a pixel electrode for each appropriate type of display device to which the present application is applied. Accordingly, the display voltage signal provided to the common electrode by the driving chip of the present application is a common voltage, and the display voltage signal provided to the pixel 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 a target object approaches the touch pixel, some of the charge coupled between the row and column 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 target 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 a target object is close to the touch pixel, another capacitance to ground (capacitance to ground) may be formed between the target 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 target object when touching the touch screen.

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

Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of an embodiment of an electronic device according to the present application. 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 is not limited to various suitable types of products such as portable electronic products, smart home electronic products, and vehicle-mounted electronic products. 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, for example, but not limited to, an In-Cell (In-Cell or In-Cell) type touch display device. The touch display device 1 is, for example, a liquid crystal display device. However, alternatively, the touch display device 1 may be other suitable types of display devices, such as an electronic paper display device (EPD), an organic electroluminescent diode display device (OLED), and the like.

The touch display device 1 includes a touch display panel 10 and a driving chip 20. The driving chip 20 is used for driving the touch display panel 10 to perform image display and touch sensing.

in one embodiment, 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 chip 20 and the plurality of common electrodes 101 are respectively connected to provide a common voltage to the plurality of common electrodes 101 to drive the plurality of common electrodes 101 to perform image display. The driving chip 20 is further configured to provide a touch driving signal to the plurality of common electrodes 101 to drive the plurality of common electrodes 101 to perform touch sensing. Preferably, the driving chip 20 is configured to drive the plurality of common electrodes 101 to perform self-capacitance touch sensing.

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 this application. The shape of each common electrode 101 is, for example, but not limited to, a rectangle.

The driving chip 20 is configured to generate a modulation signal MGND, and synchronously modulate all voltage signals output by the driving chip 20 to the touch display panel 10 by using the modulation signal MGND, so that the common electrode 101 can be further driven to perform self-capacitance touch sensing in any process of driving the touch display panel 10 to perform normal image display. Therefore, even when the display resolution of the touch display panel 10 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 chip 20 can 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 gap I (see fig. 2) and the frame gap period of the image display.

In the present embodiment, the modulation signal MGND is a square wave signal that changes periodically. However, alternatively, in other embodiments, the modulation signal MGND may have another suitable waveform such as a sine wave signal or a step wave signal. Further, the modulation signal MGND may also be a non-periodically varying signal.

When the driving chip 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 chip 20 or indirectly driven by the driving chip 20. Taking an element on the touch display panel 10 as an example, when the element is directly driven by the driving chip 20, the voltage signal on the element is the signal output from the driving chip 20; when the element is not directly driven by the driver chip 20, it is indirectly driven by the driver chip 20, for example, through capacitive coupling, which exists between the element directly driven by the driver chip 20 and the element indirectly driven by the driver chip 20, accordingly, the signal of the element superimposes the modulation signal MGND due to capacitive coupling. Thus, all voltage 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 chip 20 through, for example, resistors and the like.

Accordingly, when the driving chip 20 drives the touch display panel 10 to simultaneously perform image display and touch sensing, all voltage signals on the touch display panel 10 are signals modulated by the modulation signal MGND. Wherein all voltage signals on the touch display panel 10 vary with the variation of the modulation signal MGND. Preferably, each voltage signal on the touch display panel 10 increases with the increase of the modulation signal MGND and decreases with the decrease of the modulation signal MGND.

In this way, the driving chip 20 can modulate all voltage signals of the touch display panel 10 synchronously or approximately synchronously, so that the common electrode 101 can be driven to perform touch sensing at the same time in any process of driving the touch display panel 10 to perform normal image display. Further, since the touch driving signal can be raised due to being modulated by the modulation signal MGND, the touch sensing signal output from the common electrode 101 to the driving chip 20 can be raised accordingly, so that the signal-to-noise ratio of the touch sensing of the touch display device 1 can be improved, and the accuracy of the touch sensing of the touch display device 1 can be improved.

Optionally, the driving chip 20 is configured to time-divisionally drive the plurality of common electrodes 101 to perform touch sensing. For example, the driving chip 20 performs touch sensing on all the common electrodes 101 by driving a plurality of times each time a part of the common electrodes 101 is driven.

In some embodiments, the driving chip 20 may drive the common electrodes 101 row by row to perform image display and touch sensing, or may drive multiple rows of the common electrodes 101 at a time to perform image display and touch sensing.

Since the driving chip 20 drives the common electrodes 101 to perform self-capacitance touch sensing in a time-sharing manner (e.g., in a row or a row-by-row manner), the number of output pins of the driving chip 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 driving chip 20 can be reduced, and the purpose of saving cost can be achieved.

However, alternatively, in other embodiments, the driving chip 20 may also simultaneously drive all the common electrodes 101 to perform touch sensing. Alternatively, the driving chip 20 may perform touch sensing on the plurality of common electrodes 101 by combining time-division driving and simultaneous driving.

In different embodiments, the driving chip 20 may drive one row of the common electrodes 101 at a time to perform touch sensing, may also 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 chip 20 may also perform touch sensing not by driving the common electrode 101 in rows, for example, by driving the common electrode 101 in columns, or by driving the common electrode 101 in an irregular driving manner.

It should be noted that, in the process of simultaneously driving the plurality of common electrodes 101 to perform image display, the driving chip 20 drives the plurality of common electrodes 101 in a time-sharing manner to perform self-capacitance touch sensing. In a specific embodiment, the driving chip 20 performs image display and touch sensing by providing a touch driving signal to a part of the common electrodes 101, for example, each time, and the driving chip 20 correspondingly provides a common voltage to the rest of the common electrodes 101 to perform image display. The touch driving signal is the same as the common voltage and is a signal modulated by the modulation signal MGND.

Further, the driving chip 20 also receives a touch sensing signal output from the common electrode 101 to acquire touch position information of a target object on the touch display panel 10. Such as a user's finger, a stylus, or the like.

Since the touch driving signal is the same as the common voltage, the common electrode 101 to which the touch driving signal is supplied can perform normal image display while performing touch sensing. Accordingly, the touch sensing and the image display of the touch display device 1 can be performed simultaneously. In particular, when the driving chip 20 drives the touch display panel 10 to perform image display refresh, the common electrode 101 may be further driven to perform self-capacitance touch sensing.

Optionally, the driving chip 20 is configured to intermittently drive the touch display panel 10 to perform touch sensing. For example, in one embodiment, after the driving chip 20 drives the touch display panel 10 to simultaneously perform the touch sensing and the image display for a first predetermined time, and then drives the touch display panel 10 to perform the image display and stop performing the touch sensing for a second predetermined time, and so on, the touch display device 1 implements the image display and the touch sensing.

When the driving chip 20 drives the touch display panel 10 to perform touch sensing and image display simultaneously, all voltage signals on the touch display panel 10 or all voltage signals output by the driving chip 20 to the touch display panel 10 are based on the modulation signal MGND.

When the driving chip 20 drives the touch display panel 10 to perform image display instead of simultaneously performing touch sensing, instead of generating the modulation signal MGND, the driving chip 20 generates a constant voltage signal with reference to which all voltage signals on the touch display device 1 are.

Preferably, the constant voltage signal is a ground signal GND, which 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 the ground signal GND is typically a voltage signal on the device 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.

wherein the modulation signal MGND is a varying signal with respect to the ground signal GND.

Alternatively, in other embodiments, the driving chip 20 may be configured to drive the touch display panel 10 all the time and perform image display and touch sensing simultaneously, for example. Alternatively, the first predetermined times may be the same or different, and the second predetermined times may be the same or different.

As can be seen from the above, the touch driving signals are simultaneously used as a common voltage. In order to distinguish the common voltage provided by the driving chip 20 to the plurality of common electrodes 101 when the touch display device 1 performs touch sensing from non-touch sensing, the common voltage provided by the driving chip 20 to the plurality of common electrodes 101 when the touch display device 1 performs touch sensing is defined as a first common voltage Vcl, and the common voltage provided by the driving chip 20 to the plurality of common electrodes 101 when the touch display device 1 performs image display but not simultaneously performs touch sensing is defined as a second common voltage Vc 2.

Preferably, the voltage difference between the first common voltage Vc1 and the modulation signal MGND remains unchanged. That is, the first common voltage Vc1 remains unchanged with respect to the modulation signal MGND. The first common voltage Vc1 is a varying signal with respect to the ground signal GND.

The second common voltage Vc2 remains unchanged compared to the ground signal GND. However, the second common voltage Vc2 may alternatively be a varying signal, such as a square wave signal, compared to the ground signal GND. When the second common voltage Vc2 and the first common voltage Vc1 are both periodic square wave signals, the frequency of the second common voltage Vc2 is less than the frequency of the first common voltage Vc 1.

It should be noted that, taking a common electrode 101 as an example, when the driving chip 20 drives the common electrode 101 to simultaneously perform image display and touch sensing, the first common voltage Vc1 provided to the common electrode 101 is simultaneously used as a display driving signal and a touch driving signal; when the driving chip 20 drives the common electrode 101 to perform only image display, the first common voltage Vc1 supplied to the common electrode 101 is used only as a display driving signal.

As can be seen from the above, when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing in a time-sharing manner, the first common voltage Vc1 simultaneously supplied to the plurality of common electrodes 101 by the driving chip 20 is not all used as a touch driving signal at the same time. However, when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing simultaneously, the first common voltage Vc1 supplied to the plurality of common electrodes 101 is simultaneously used as a touch driving signal.

In particular, when the driving chip 20 time-divisionally drives the plurality of common electrodes 101 to perform touch sensing, although the driving chip 20 simultaneously 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 chip 20 is different from a circuit configuration of driving the common electrodes 101 to only perform image display. In this regard, the present application will be described in detail below.

Since all the voltage signals on the touch display panel 10 are signals synchronously modulated by the modulation signal MGND, the modulated display driving signal in all the voltage 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 chip 20 may 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, and the touch sensing does not affect normal image display. 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. 5, in general, the touch display panel 10 includes a plurality of pixel points 11, and each pixel point 11 includes a common electrode 101 and a pixel electrode 103. The absolute value of the voltage difference between the common electrode 101 and the pixel electrode 103 determines the display gray scale of the pixel 11. When the driving chip 20 drives the touch display panel 10 to perform touch sensing, after the signals on the common electrode 101 and the pixel electrode 103 are modulated synchronously by the modulation signal MGND, the display voltage difference between the common electrode 101 and the pixel electrode 103 does not change, and therefore, the touch display panel 10 performs normal image display. And the first common voltage Vc1 modulated by the modulation signal MGND may be further used as a touch driving signal. Therefore, in the process of ensuring that the touch display panel 10 performs normal display of an image, the driving chip 20 can further drive the common electrode 101 to perform self-capacitance touch sensing.

It should be noted that, 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 by the driving chip 20, and the signal on the pixel electrode 103 of the pixel 11 performing the image display hold is superimposed with 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, 8K, a plurality of cases may be included. With the touch display device 1 of the present application, touch sensing can be further performed in any process of image display thereof, and the touch sensing does not affect normal image display.

Since the voltage 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 chip 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 chip 20 may also drive the common electrode 101 to perform self-capacitance touch sensing. At this time, the whole touch display panel 10 is in the state of image display hold, and since the signal output from the driving chip 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. 5) 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 chip 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 time period for the driving chip 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 chip 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 chip 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 chip 20 may perform touch sensing for simultaneously driving some common electrodes 101. For example, the driving chip 20 simultaneously drives a part of the common electrodes 101 of the plurality of common electrodes 101 at a time to perform touch sensing, and completes one touch sensing of all the common electrodes 101 by driving a plurality of times.

In this application, once touch sensing on the plurality of common electrodes 101 is completed only by the driving chip 20 through multiple driving, that is, the driving chip 20 is defined to time-divisionally drive the plurality of common electrodes 101 to perform touch sensing.

For the driving chip 20 to time-share drive the plurality of common electrodes 101 to perform self-capacitance touch sensing, in some embodiments, for example, the following steps may be performed: the driving chip 20 drives the common electrode 101 by rows to perform self-capacitance touch sensing. When the driving chip 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 chip 20 drives one row of common electrodes 101 to perform self-capacitance touch sensing, another row of common electrodes 101 is driven to perform self-capacitance touch sensing and image display, and the other rows of common electrodes 101 are driven to perform image display. As such, by the multiple driving, one touch sensing driving to all the common electrodes 101 is completed.

It should be noted that the common electrodes 101 sequentially driven by the driving chip 20 to perform touch sensing may be partially overlapped or not overlapped.

In particular, for the manner in which the driving chip 20 intermittently drives the touch display panel 10 to perform self-capacitance touch sensing, a period in which the common electrode 101 performs touch sensing is defined as a first period W1, and a period in 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 chip 20 generates the modulation signal MGND and synchronously modulates the input signal of the touch display panel 10 with the modulation signal MGND. Accordingly, the driving chip 20 simultaneously outputs the first common voltage Vcl to the plurality of common electrodes 101 to perform image display, and time-divisionally receives touch sensing signals output from the plurality of common electrodes 101 to acquire touch information.

For the sake of easy clear distinction from the signals of the second period W2 described below, the voltage signals output by the driving chip 20 to the touch display panel 10 in the first period W1 are all defined as first signals, and the voltage signals output by the driving chip 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.

At every second period W2, the driving chip 20 outputs a second signal to the touch display panel 10 to perform image display.

Preferably, in the second period W2, the driving chip 20 does not synchronously modulate the input 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 chip 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 the second common voltage Vc 2. In the second period W2, the driving chip 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. 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 amplitude of the modulation signal MGND is for example a signal between 0.15V and 0.3V. Alternatively, the amplitude of the modulation signal MGND is, for example, a signal of 0.2V.

However, the present invention is not limited thereto, and the modulation signal MGND, the second common voltage Vc2, and other signals may be other suitable types of signals.

Since the driving chip 20 does not synchronously modulate the input signal of the touch display panel 10 with the modulation signal MGND in the second period W2, for example, the driving chip 20 still drives the touch display panel 10 in the existing display driving manner, the touch display device 1 has relatively reduced power consumption in the second period W2 compared with the technical solution of modulating in the first period W1.

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

In the first period W1, the driving chip 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 situation that the driving chip 20 drives all the common electrodes 101 to perform the touch sensing for multiple times can be divided into multiple situations, for example, the driving chip 20 drives all the common electrodes 101 to perform the touch sensing for the same number of times, or the driving chip 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 chip 20 drives the two parts of the common electrodes 101 to perform the touch sensing for different 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, the power consumption can be reduced 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.

The touch display device 1 and the operation principle thereof will be described below mainly in a manner that the driving chip 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 driving chip 20 includes a modulation circuit 21, a common voltage generation circuit 22, a touch driving 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 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 MGND is a periodically-varying square-wave pulse signal in which a first reference signal and a second reference signal alternately appear.

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 0.2V. However, the grounding signal is 0V, and the driving signal is 0.2V, which is only an example, and a manufacturer may adjust the amplitude of the modulation signal MGND according to the product condition, and the application does not limit this.

In addition, taking the first reference signal as a low level signal and the second reference signal as a high level signal as an example, the duration of the first reference signal of the modulation signal MGND is preferably 2 times the duration of the second reference signal. Alternatively, the duration of the first reference signal of the modulation signal MGND may be the same as the duration of the second reference signal.

When the duration of the first reference signal of the modulation signal MGND is 2 times the duration of the second reference signal, the driving chip 20 performs a reset operation during the first half of the first reference signal, and performs sampling of the touch sensing signal during the second half of the first reference signal and the second reference signal, respectively. Thus, the accuracy of touch sensing can be improved.

When the duration of the first reference signal of the modulation signal MGND is the same as the duration of the second reference signal, the driving chip 20 performs, for example, a reset operation during the existence of the first reference signal and performs sampling of the touch sensing signal during the existence of the second reference signal, respectively.

However, the present invention is not limited thereto, and the duration of the first reference signal and the second reference signal of the modulation signal MGND may be other suitable types.

Optionally, the driving chip 20 further includes 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 chip 20 achieves synchronous modulation of all voltage signals on the touch display panel 10 by providing the modulation signal MGND to a part of the driving chip 20, so as to drive the touch display panel 10 to simultaneously perform normal image display and touch sensing. That is, as long as the signal on the ground is the modulation signal MGND, all voltage signals of the touch display panel 10 are synchronously changed into a signal modulated by the modulation signal MGND.

As can be seen from the above, when the driving chip 20 drives the touch display panel 10 to simultaneously perform image display and touch sensing, the driving chip 20 includes two parts, one part is used for loading the modulation signal MGND and the other part is used for loading the ground signal GND.

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. In other words, in the first period W1, 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.

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.

In the present embodiment, in the first period W1, the common voltage generation circuit 22, the touch drive circuit 23, the signal processing circuit 26, the data selection circuit 24, and the control circuit 25 are located in the field 90, and the touch display panel 10 is also located in the field 90; the modulation circuit 21 and the voltage generation circuit 27 are located in the domain 80.

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 voltage 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, signals on elements (e.g., a pixel electrode 103 which performs image display holding described later, see fig. 5) in a floating state on the touch display panel 10, for example, superimpose the modulation signal MGND due to a capacitive coupling effect. Therefore, in the first period W1, all the voltage electric signals on the touch display panel 10 become signals modulated by the modulation signal MGND.

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

In the second period W2, the electronic device 100 is referenced to the ground signal GND as a voltage as a whole.

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 the touch information. Accordingly, the driving chip 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 utility model discloses a touch display device 1 all can carry out touch sensing simultaneously among the arbitrary process of carrying out image display, just, the interference that does not have between touch sensing and the image display or cause image display is less.

In addition, since the modulation circuit 21, the touch driving circuit 23 and other circuits are integrated in a single driving chip 20, and the single chip saves space compared with a plurality of chips, the touch display device 1 occupies a smaller space of the electronic apparatus 100. In addition, compared with a plurality of chips, a single chip is more beneficial to the assembly and production management of the touch display device 1, and the production efficiency is improved, so that the manufacturing cost of the electronic device 100 is reduced.

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 plurality of common electrodes 101, thereby causing the touch display device 1 to perform image display for the second period W2 and stop performing touch sensing.

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 has a different circuit structure from the common voltage generating circuit 22. The touch driving circuit 23 can further receive a touch sensing signal output from the common electrode 101. The signal processing circuit 26 acquires touch position information from 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 signal processing circuit 26 may obtain touch position 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.

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 generation circuit 22 and the touch driving circuit 23 respectively output a first common voltage Vc1, which is the same as the first reference voltage signal, to the plurality of common electrodes 101, wherein the common electrode 101 electrically connected to the common voltage generation circuit 22 performs only image display, and the common electrode 101 electrically connected to the touch driving circuit 23 performs both image display and self-capacitance touch sensing.

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 while driving the common electrode 101 to perform normal image display. 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 present 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 present 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.

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 row may be selectively connected to two operational amplifiers 231, and other embodiments are also possible.

The utility model discloses a touch drive circuit 23 provides the touch drive signal the same with first common voltage Vc1 that common voltage generating circuit 22 produced for common electrode 101 to, touch drive signal can drive common electrode 101 and both carry out image display and carry out self-capacitance touch sensing, consequently, touch display device 1a plurality of common electrode 101 can further carry out touch sensing when carrying out 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.

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.

Through the data selection circuit 24, on one hand, the number of the connection lines L between the driving chip 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.

Alternatively, in some embodiments, the touch display device 1 may also be configured to continuously perform image display and touch sensing, for example, in time, the common voltage generation circuit 22 and the touch driving circuit 23 continuously provide the first common voltage Vc1 to the common electrode 101, and in space, the common voltage generation circuit 22 and the touch driving circuit 23 cooperate to drive the plurality of common electrodes 101. 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.

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 chip 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 chip 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 touch driving 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.

referring to fig. 2, fig. 3, and fig. 5, fig. 5 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 chip 20 to perform image display and touch sensing. Each pixel 11 includes the common electrode 101, a pixel electrode 103, and 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 driving chip 20. The second transfer electrode D is connected to the pixel electrode 103. The driving chip 20 is used for driving the control switch 105 to be turned on and off.

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 present 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, several pixel points 11 can share the same common electrode 101. However, in other modified embodiments, each pixel 11 may include a common electrode 101. In addition, for other types of display devices such as OLED, each pixel 11 may include a plurality of switches and capacitors.

In the first period W1, the driving chip 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 chip 20 drives the plurality of pixel points 11 by rows to perform image display refresh. In the first period W1, when the driving chip 20 drives the pixel points 11 in a certain row to perform image display refresh, the driving chip 20 turns off the control switches 105 of the pixel points 11 in the remaining rows by providing a first scan-off signal Vg2 to the control switches 105 of the pixel points 11 in the remaining rows, so that the pixel points 11 in the remaining rows are in an 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 chip 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 at 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.

In contrast, in the second period W2, the driving chip 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 chip 20 drives the pixel points 11 in a certain row to perform image display refresh, the control switch 105 providing the second scanning cut-off signal Vg4 to the pixel points 11 in the remaining rows is cut 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 chip 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 chip 20 to the first transmission electrode S of the control switch 105.

The driving chip 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 chip 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 the input signal 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 chip 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 the line gap I and the 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 chip 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 chip 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 0.2V, i.e., the first reference signal of the modulation signal MGND is 0V and the second reference signal is 0.2V. Accordingly, the first common voltage Vc1 is a signal in which a voltage signal of (-1) V and a voltage signal of (-0.8) V are alternately output.

it should be noted that, in fig. 5, 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, etc., however, it is clear to those skilled in the art from the above description that the modulation circuit 21 is a circuit that outputs the modulation signal MGND to other circuits with a ground terminal in the domain 90.

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

In addition, In some modified embodiments, the scan driving circuit 28 is formed on the touch display panel 10, for example, by a gip (gate In panel) technology, and is not integrated In the driving chip 20.

Similarly, the data selection circuit 24 may also be formed on the touch display panel 10, for example, by the GIP technology, instead of being integrated in the driving chip 20.

Referring to fig. 6 and 7 together, fig. 6 is an exploded schematic view of an embodiment of the touch display panel 10 shown in fig. 5. Fig. 7 is a schematic cross-sectional view of the touch display panel 10 shown in fig. 6. 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. 8 and 9 together, fig. 8 is a schematic cross-sectional structure view of another embodiment of the touch display panel 10 shown in fig. 5. Fig. 9 is a schematic top view of the touch display panel 10 shown in fig. 8. 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. In the IPS liquid crystal display panel, the electric field formed between the pixel electrode 103 and the common electrode 101 is a parallel electric field.

Referring to fig. 1 and fig. 3 again, the electronic device 100 further includes the 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 chip 20 and is configured to supply power to the driving chip 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 chip 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, 10 and 11 together, fig. 10 is a block diagram of an embodiment of the signal processing circuit 26 shown in fig. 3. Fig. 11 is a schematic structural diagram of an embodiment of a signal processing unit 261 of the signal processing circuit 26 shown in fig. 10. 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. 10, 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.

When the driving chip 20 drives the touch display panel 10 to perform touch sensing, since the ground voltages between the domains 80 and 90 are different, when signal transmission is performed between the two domains 80 and 90, level conversion is required to be performed on the signal so as to meet the voltage withstanding requirement of the electronic component. Accordingly, the driving chip 20 may further include a level shifting unit 264. The level shifting unit 264 spans both domains 80, 90. For example, the calculation unit 265 is connected to the main control chip 3 through the level conversion unit 264. The level conversion unit 264 is configured to perform level conversion on the signal representing the touch coordinate output by the calculation unit 265, and then output the signal after level conversion to the main control chip 3.

Referring to fig. 12, fig. 12 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 chip 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 ground terminals for the circuits in the domain 90 are connected between the modulation circuit 21 and the first ground terminal 201, for example, and the ground terminals for the circuits in the domain 80 are connected between the modulation circuit 21 and the second ground terminal 203, for example.

The driving chip 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, so as 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 chip 20 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, when the modulation ground scheme is not adopted in the second period W2, 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 when the modulation ground scheme is adopted in the first period W1, the voltage reference of the domain 80 is different from that of the domain 90, and therefore level conversion is needed.

In the present embodiment, the two domains 80 and 90 are divided into circuit blocks or circuit units in the driver chip 20: the display driving circuit 20a, the touch driving circuit 23, the signal processing circuit 26, the data selection circuit 24, and the control circuit 25 are all divided into a field 90 with MGND as a reference, and the touch display panel 10 is also divided into the field 90; the modulation circuit 21, the display processing circuit 205, 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.

Alternatively, the present invention may also be applied to the division of the driving chip 20 in the two domains 80 and 90, 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.

In addition, the amplitude of the modulation signal MGND is changed to about 0.2V, which is based on not affecting the normal operation of the level shift unit 264, and is changed according to the level of the incoming signal of the main control chip 3 and the device type of the level shift unit 264.

Further, since the voltage of 0.2V is smaller than the voltage of 1.8V, the amplitude of the signal modulated by the modulated signal MGND is relatively small, and therefore, the signal between the domain 80 and the domain 90 may be selected without performing level conversion, or the level conversion unit 264 may be provided only in the domain 80, for example, and perform level conversion on the signal output from the signal processing circuit 26.

Since the voltage signal of the touch display panel 10 during the touch sensing is modulated by the modulation signal MGND, wherein the driving chip 20 provides the common electrode 101 with the display driving signal for performing the image display, i.e. the common voltage, for example, the second common voltage Vc2, which is modulated by the modulation signal MGND, and is then suitable for driving the common electrode 101 to perform the touch sensing, the common electrode 101 can be further driven to perform the touch sensing while ensuring that the touch display panel 10 performs the normal image display, and in addition, the signal-to-noise ratio of the touch display device 1 can be improved, thereby improving the touch sensing accuracy.

Referring to fig. 12, in the present embodiment, in the first period W1, since a part of the driving chip 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 chip 20 further includes a first power terminal 206 and a second power 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.

The protection circuit 15 may be integrated in the driving chip 20, or may be disposed outside the driving chip 20.

Referring to fig. 13, fig. 13 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. 14, and fig. 14 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. 13, the protection circuit shown in fig. 14 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 chip 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 driver chip 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 chip 20 provides the second gray scale voltage Vd2 to the pixel electrode 103 and 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 chip 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.

Referring to fig. 15, fig. 15 is a schematic structural diagram of an embodiment of the display processing circuit 205. The display processing circuit 205 includes, for example, a storage circuit 2051, a decompression circuit 2053, and a color adjustment circuit 2055. The memory circuit 2051, the decompression circuit 2053, and the color adjustment circuit 2055 are connected in this order. The storage circuit 2051 is further connected to the main control chip 3. The color adjustment circuit 2055 is further connected to the control circuit 25 through the level shift unit 264.

The storage circuit 2051 is configured to receive display data from the main control chip 3 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 on the display data, and outputs the adjusted 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 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.

It should be noted that the display processing circuit 205 is 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, some elements, combination circuits, and the like may be reduced or added to the touch display device 1 and the electronic device 100 according to the embodiments of the present application, and any technical solutions that can be reasonably derived by common general knowledge, the prior art, and the technical contents of the present application shall fall within the scope of the present application for a person having ordinary skill in the art.

Further, since the modulation circuit 21, the display processing circuit 205, the touch driving circuit 23, the display driving circuit 20a, the control circuit 25, and the level conversion unit 264 are all integrated in a single driving chip 20, and the single chip saves space compared to multiple chips, the touch display device 1 occupies a smaller space of the electronic apparatus 100. In addition, compared with a plurality of chips, a single chip is more beneficial to the assembly and production management of the touch display device 1, and the production efficiency is improved, so that the manufacturing cost of the electronic device 100 is reduced.

The foregoing embodiments have been described by taking the driving chip 20 driving the common electrode 101 to perform self-capacitance touch sensing as an example, however, the present application is not limited thereto, and it is within the scope of the present application as long as the touch display device is modified based on the same or similar ideas.

In addition to the embodiments of multiplexing the common electrode for self-capacitance touch sensing, touch sensing can be performed by additionally disposing a layer of touch sensing electrode, and such embodiments are also feasible.

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 driving chip for driving a touch display panel to perform image display and touch sensing, the touch display panel including a plurality of common electrodes, the driving chip comprising: the driving chip includes:

When the modulation circuit outputs the modulation signal to the touch display panel, the driving chip drives the touch display panel to execute image display refreshing and further drives a common electrode to execute self-capacitance touch sensing, wherein voltage signals on the touch display panel change along with the change of the modulation signal;

2. The driver chip of claim 1, wherein: and the voltage signal on the touch display panel takes the modulation signal and the constant voltage signal output by the modulation circuit as references.

3. The driver chip of claim 1, wherein: when the modulation circuit outputs the modulation signal to the touch display panel, the voltage signal on the touch display panel increases along with the increase of the modulation signal and decreases along with the decrease of the modulation signal.

4. The driver chip of claim 1, wherein: the touch display panel comprises a grounding wire, and the modulation circuit is connected with the grounding wire and used for providing the modulation signal and the constant voltage signal to the grounding wire in a time-sharing mode.

5. The driver chip of claim 4, wherein: the driving chip comprises a first grounding end and a second grounding end, the second grounding end is used for being connected with a device ground and receiving a grounding signal, and the modulation circuit is connected between the first grounding end and the second grounding end and used for generating the modulation signal according to the grounding signal and a driving signal and providing the modulation signal to the grounding line and the first grounding end.

6. The driver chip of claim 5, wherein: the modulation signal is a square wave signal which changes periodically, and the square wave signal comprises the grounding signal and the driving signal.

7. The driver chip of claim 5, wherein: the constant voltage signal is the ground signal.

8. The driver chip of claim 5, wherein: the touch display panel further comprises a plurality of pixel electrodes, and the driving chip is used for driving the touch display panel to execute image display refreshing and further driving the common electrode to execute self-capacitance touch sensing by providing a first gray scale voltage to the plurality of pixel electrodes and providing a first common voltage to the plurality of common electrodes.

9. The driver chip of claim 8, wherein: when the driving chip drives the touch display panel to simultaneously execute image display refreshing and touch sensing, the common electrode for driving the touch sensing and the pixel electrode for driving the image display refreshing are not overlapped.

10. The driver chip of claim 9, wherein: the driving chip drives a common electrode for performing touch sensing and a pixel electrode for performing image display refreshing to be spaced by a plurality of lines for performing image display holding.

11. The driver chip of claim 8, wherein: the driving chip further includes: a common voltage generating circuit selectively connected to the plurality of common electrodes for driving the common electrodes to perform image display; the touch driving circuit is selectively connected with the plurality of common electrodes and is used for driving the same common electrode to simultaneously execute image display and touch sensing;

12. The driver chip of claim 11, wherein: when the modulation circuit outputs the modulation signal to the first ground terminal, the touch driving circuit is configured to provide a touch driving signal to the part of the common electrodes to perform image display and touch sensing simultaneously, and the common voltage generation circuit is configured to provide a first common voltage to the rest of the common electrodes to perform image display, where the first common voltage and the touch driving signal are signals obtained by modulating the same voltage signal with the modulation signal.

13. The driver chip of claim 12, wherein: the common voltage generating circuit comprises a signal source, a follower and a voltage stabilizing circuit, wherein the follower is connected between the signal source and the voltage stabilizing circuit, and the follower is further selectively connected with the plurality of common electrodes; the touch driving circuit comprises the signal source and a plurality of operational amplifiers, and the operational amplifiers are connected with the signal source and further can be selectively connected with the common electrodes; when the modulation circuit outputs the modulation signal to the first ground terminal, the signal source outputs the first reference voltage signal to the follower and the operational amplifiers; the follower outputs a first common voltage which is the same as the first reference voltage signal to the corresponding common electrode, the voltage stabilizing circuit stabilizes the first common voltage, and the operational amplifiers output touch driving signals which are the same as the first reference voltage signal to the corresponding common electrode.

14. The driver chip of claim 13, wherein: the driving chip further comprises a plurality of signal processing circuits, the plurality of signal processing circuits are connected with the plurality of operational amplifiers, the plurality of operational amplifiers are used for receiving touch sensing signals output by the common electrode while outputting touch driving signals to the common electrode, the plurality of signal processing circuits obtain touch position information of a target object on the touch display panel according to the touch sensing signals, and voltage signals on the plurality of signal processing circuits are all based on the voltage signal on the first grounding terminal.

15. The driver chip of claim 14, wherein: the driving chip further comprises a level conversion unit, wherein the level conversion unit is connected with the plurality of signal processing circuits and is used for carrying out level conversion on the touch position information output by the plurality of signal processing circuits.

16. the driver chip of claim 11, wherein: the touch driving circuit and the common voltage generating circuit are selectively connected with the plurality of common electrodes through a data selection circuit.

17. the driver chip of claim 16, wherein: the data selection circuit is integrated in the driving chip.

18. The driver chip of claim 16, wherein: the driving chip further comprises a control circuit, the control circuit is connected with the data selection circuit and controls the data selection circuit through the control circuit, and the common voltage generation circuit and the touch driving circuit can be selectively connected with the plurality of common electrodes.

19. a touch display device characterized by: comprising a driver chip according to any of the preceding claims 1-18.

20. An electronic device, characterized in that: comprising a touch display device according to claim 19.