WO2019113797A1

WO2019113797A1 - Driving chip, touch display apparatus, and electronic device

Info

Publication number: WO2019113797A1
Application number: PCT/CN2017/115729
Authority: WO
Inventors: 林峰
Original assignee: 深圳深微创芯科技有限公司
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2019-06-20
Also published as: CN209803753U

Abstract

A driving chip (20), a touch display apparatus (1), and an electronic device (100). The driving chip (20) is used for driving multiple common electrodes (101) of a touch display panel (10) to execute image display, and is also used for intermittently driving the multiple common electrodes (101) to execute touch sensing. A time period in which there is a common electrode (101) to execute touch sensing is defined as a first time period (W1), and a time period in which none of the multiple common electrodes (101) executes touch sensing is defined as a second time period (W2). The driving chip (20) comprises: a first ground terminal (201); a modulation circuit (21) for generating a modulation signal to the first ground terminal (201) within the first time period (W1), and generating a constant voltage signal to the first ground terminal (201) within the second time period (W2); a touch driving circuit (28) for driving the same common electrode (101) to simultaneously execute image display and self-capacitive touch sensing within the first time period (W1); and a common voltage generation circuit for driving the multiple common electrodes (101) to execute image display within the second time period (W2). The touch display apparatus (1) comprises the driving chip (20). The electronic device (100) comprises the touch display apparatus (1).

Description

Driver chip, touch display device, and electronic device

Technical field

The utility model relates to the field of integrated circuit technology, in particular to a driving chip for driving a touch display panel to perform image display and touch sensing.

Background technique

For touch display devices, especially touch display devices that perform touch sensing by multiplexing common electrodes, in order to reduce interference between touch sensing and image display refresh, manufacturers generally adopt a method of controlling touch display panel to perform touch sense in a time-sharing manner. The measurement and image display refresh. For example, in one embodiment, the touch sensing of the touch display panel is driven during a line gap or frame gap of the image display.

However, as the resolution of the touch display panel is gradually increased, for example, the resolution of the liquid crystal display panel of the mobile phone gradually adopts a resolution of 2K (eg, 2560×1440), or even higher resolution, and the display refresh frequency is generally adopted. 60HZ, the line gap and the frame gap are obviously compressed. If the touch sensing is performed by driving the touch sensing electrodes only in the line gap or the frame gap, the touch sensing may not be fully performed due to the obvious time. problem. When the refresh rate of the touch display device is increased to 120 Hz, less time is available for touch sensing.

Utility model content

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention needs to provide a driving chip, a touch display device, and an electronic device capable of driving a touch display panel while performing image display and touch sensing.

The present invention provides a driving chip for driving a touch display panel to perform image display and touch sensing, wherein the touch display panel includes a plurality of common electrodes; the driving chip is configured to drive the plurality of common electrodes Performing image display, further for intermittently driving the plurality of common electrodes to perform touch sensing, defining that a period in which the common electrode performs touch sensing is a first time period, and defining that the plurality of common electrodes are not performing touch sensing The time period is the second time period; the driving chip includes:

a first ground end, wherein a voltage signal output by the driving chip to the touch display panel is based on a voltage signal on the first ground end;

a modulation circuit, configured to generate a modulation signal to the first ground end during a first time period, and generate a constant voltage signal to the first ground end during a second time period;

a touch driving circuit, configured to simultaneously perform image display and self-capacitive touch sensing while driving the same common electrode in a first time period;

And a common voltage generating circuit for driving the plurality of common electrodes to perform image display in a second period of time.

Since the modulation circuit generates the modulation signal to the first ground terminal during a first period of time, the touch driving circuit can further drive the same common electrode to perform image display while driving the common electrode to perform touch sensing, thereby The normal image display of the touch display panel is not affected. Therefore, the time during which the driving chip drives the common electrode to perform touch sensing is not limited to the line gap of the image display, the frame gap, or may be during the image display refresh period. Accordingly, even when the resolution of the touch display panel is increased, the time during which the driving chip is used to drive the touch display panel to perform touch sensing is not shortened. Thereby, the user experience is improved.

In addition, the modulation circuit and the touch driving circuit are all located in the same driving chip, instead of being respectively located in two chips, thereby saving the pin connecting between the chip and the chip, and reducing the volume of the electronic device occupied by the chip. In addition, it is also conducive to production management, improve production efficiency, and thus reduce product production costs.

Optionally, during the first time period, the voltage signal of the driving chip to the touch display panel is synchronously modulated by the modulation signal, and the driving chip further drives the public while driving the touch display panel to perform image display. The electrodes perform self-capacitive touch sensing.

Optionally, the touch driving circuit is configured to drive the plurality of common electrodes to perform touch sensing in a time division manner, and when the touch driving circuit is electrically connected to a part of the common electrode, the common voltage generating circuit and the remaining common electrode Electrically connected, the touch drive signal provided by the touch drive circuit to the common electrode is the same as the first common voltage supplied to the common electrode by the common voltage generating circuit.

Optionally, for the same common electrode, when the touch drive circuit provides the touch drive signal to the common electrode, a touch sensing signal from the common electrode output is further received.

Optionally, the touch driving circuit provided by the touch driving circuit to the common electrode and the first common voltage provided by the common voltage generating circuit to the common electrode are both signals modulated by the modulated signal.

Optionally, the touch display panel further includes a plurality of pixel electrodes for forming a fringe electric field or a parallel electric field with the plurality of common electrodes; during the first time period, the driving chip passes Providing a first gray scale voltage to the plurality of pixel electrodes, providing the same first common voltage and a touch driving signal to the plurality of common electrodes to drive the touch display panel to perform image display refreshing, further driving the common electrode Performing self-capacitive touch sensing, wherein the first gray scale voltage, the first common voltage, and the touch drive signal both increase with an increase of the modulation signal, and decrease with the modulation signal reduce.

Optionally, at the same time, the pixel electrode provided by the driving chip to the first gray scale voltage is spaced apart from the common electrode provided to the touch driving signal by at least one row of the common electrode.

Optionally, the first time period and the second time period alternate.

Optionally, the constant voltage signal is a ground signal.

Optionally, the driving chip further includes a signal processing circuit, the signal processing circuit is connected to the touch driving circuit, and the signal processing circuit is configured to obtain a touch bit according to the touch sensing signal received by the touch driving circuit. Set the information.

Optionally, the voltage signal on the signal processing circuit is referenced to a voltage signal on the first ground.

Optionally, the common voltage generating circuit and the touch driving circuit are selectively connectable to the plurality of common electrodes by a data selecting circuit.

Optionally, the driver chip comprises the data selection circuit.

Optionally, the data selection circuit includes a first data selector and a plurality of second data selectors, wherein the first data is selected to be connected to the common voltage generating circuit, and further used to a common electrode connection; the plurality of second data selectors are coupled to the touch drive circuit, and each of the second data selectors is configured to connect a portion of the common electrode.

Optionally, the driving chip further includes a second ground end, wherein the second ground end is used to connect to the device ground, and receives a ground signal; the modulation circuit is connected to the first ground end and the second ground Between the ends, the modulation signal is generated according to the ground signal and a driving signal.

Optionally, the level of the drive signal is higher than the level of the ground signal.

Optionally, the driving chip further includes a display driving circuit, a display processing circuit, and a level converting unit, wherein the display processing circuit is configured to receive display data from a main control chip, and store and solve the display data. Compressing, and color-adjusting, and outputting the adjusted display data to the level converting unit for converting, the level converting unit level-converting the display data, and outputting the converted display data to the display a driving circuit, wherein the display driving circuit generates a corresponding gray scale voltage corresponding to the plurality of pixel electrodes according to the received display data.

Optionally, the voltage signal on the display driving circuit is based on a voltage signal on the first ground, and the voltage signal on the display processing circuit is based on a voltage signal on the second ground.

Optionally, the modulation signal includes a first reference signal and a second reference signal, the level of the first reference signal being lower than a level of the second reference signal, wherein the first reference signal continues The time is greater than or equal to the duration of the second reference signal.

Optionally, the duration of the first reference signal is twice the duration of the second reference signal.

Optionally, the modulated signal is a periodically varying square wave signal.

The present invention further provides a touch display device including a touch display panel and a driving chip, wherein the driving chip is configured to drive the touch display panel to perform image display and touch sensing, wherein the driving chip is any one of the above The driver chip described in the item.

The present invention also provides an electronic device comprising the above touch display device.

DRAWINGS

FIG. 1 is a schematic diagram showing the structure of an electronic device of the present application.

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

FIG. 3 is a schematic diagram showing the circuit structure of an embodiment of the electronic device shown in FIG. 1. FIG.

4 is a schematic diagram showing the circuit structure of an embodiment of the modulation circuit shown in FIG.

FIG. 5 is a schematic circuit diagram of a specific embodiment of the electronic device shown in FIG. 1. FIG.

FIG. 6 is an exploded perspective view of an embodiment of the touch display panel of FIG. 5. FIG.

7 is a cross-sectional structural view of the touch display panel shown in FIG. 6.

FIG. 8 is a cross-sectional structural view showing another embodiment of the touch display panel shown in FIG. 5. FIG.

9 is a top plan view of the touch display panel of FIG. 8.

Figure 10 is a block diagram showing the structure of an embodiment of the signal processing circuit shown in Figure 3.

11 is a block diagram showing an embodiment of a signal processing unit of the signal processing circuit shown in FIG.

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

FIG. 13 is a schematic diagram showing the circuit structure of an embodiment of the protection circuit shown in FIG.

14 is a schematic diagram showing the circuit structure of another embodiment of a protection circuit.

Figure 15 is a schematic diagram of an embodiment of the display processing circuit of Figure 12;

Detailed ways

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the invention. However, the example embodiments can be embodied in a variety of forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be It is communicated to those skilled in the art. The thickness and size of each layer shown in the drawings may be exaggerated, omitted or schematically shown, and the number of related elements may be schematically illustrated for convenience or clarity. In addition, the size of the component does not fully reflect the actual size, and the number of related components does not fully reflect the actual number. The number of identical or similar or related elements shown in different figures may be inconsistent because of the different size of the drawings and the like. The same reference numerals in the drawings denote the same or similar structures. It should be noted that, in order to make the labels have regularity and logic, etc., in some different embodiments, the same or similar elements or structures adopt different reference numerals, according to the technical relevance and related text description. Those skilled in the art can directly or indirectly determine the knowledge.

Furthermore, the described features, structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details or other structures, components, and the like. 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 are applied to techniques, methods, physical elements, and systems (whether or not currently known), including those inferred or inferred by those skilled in the art after reading this application. Expansion.

In the description of the present invention, it is to be understood that "a plurality" includes two or more, "multiple" includes two or more, and "multiple" includes two and two or more, " "Multiple rows" include two rows and two or more rows, and "multiple columns" includes two columns and two or more columns unless otherwise specifically defined by the present application. In addition, the words "first", "second", "third", "fourth" and the like appearing in each component name and signal name are not intended to limit the order in which the components or signals appear, but to facilitate the naming of the components. Clearly distinguish the components to make the description more concise and understandable.

In order to avoid confusion, some further explanations are needed:

For a general display device, the display device typically includes a display panel and a drive circuit. The driving circuit is configured to drive the display panel to perform image display. The display panel typically includes a plurality of pixel points, each pixel point including a first electrode and a second electrode. The driving circuit provides different voltages to the second electrodes of the respective pixels by supplying the same voltage (for example, 0 volts) to the first electrodes of the respective pixel points, thereby realizing image display of different gray levels.

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 perform image display refresh by supplying a common voltage to the first electrode, supplying a gray scale voltage to the second electrode. Alternatively, the display device may be other suitable types of display devices, such as an electronic paper display device (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, its image display state generally includes an image display refresh state and an image display hold state. Taking a single pixel as an example, when the driving circuit supplies a gray scale voltage to the second electrode and supplies a common voltage to the first electrode, the pixel starts to perform image display refresh, when the gray scale voltage is written to the first After the two electrodes, the supply of the gray scale voltage to the second electrode is stopped, and the image display refresh is completed. Thereafter, the pixel enters the image display hold state until the pixel point receives the gray scale voltage next time.

Generally, the plurality of pixel points are arranged, for example, in a matrix. The drive circuit typically performs image display refreshes by driving pixel points row by row.

The two different display states of the image display refresh and the image display are described above in advance, in order to better understand the various embodiments described below in the present application.

As described above, the names of the first electrode and the second electrode in different types of display devices are different. For each suitable type of display device to which the present application is applied, the first electrode is collectively referred to as a common electrode, and the second electrode is collectively referred to as a second. The electrode is a pixel electrode. Correspondingly, the display voltage signal supplied to the common electrode by the driving chip of the present application is a common voltage, and the display voltage signal supplied to the pixel electrode is a gray scale voltage.

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

In a mutual capacitance based touch system, the touch screen may include, for example, a driving area and a sensing area such as a driving line and a sensing line. In an example case, the drive lines may form multiple rows, while the sense lines may form multiple columns (eg, orthogonal). Touch pixels can be placed at the intersection of rows and columns. During operation, the rows may be energized with an alternating current (AC) waveform, and mutual capacitance may be formed between the rows and columns of the touch pixels. As a target object approaches the touch pixel, some of the charge coupled between the rows and columns of the touch pixel can instead be coupled to the object. This reduction in charge coupled to the touch pixel can result in a net decrease in mutual capacitance between the rows and columns and a decrease in the AC waveform coupled to the touch pixel. This reduction in the charge coupled AC waveform can be detected and measured by the touch system to determine the location of the target object as it touches 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 approaches the touch pixel, another capacitance to ground may be formed between the target object and the touch pixel. The other pair of ground capacitances can result in a net increase in self-capacitance experienced by the touch pixel. This self-capacitance increase can be detected and measured by the touch system to determine the location of the target object as it touches the touch screen.

Hereinafter, each embodiment of the present application will be described.

Please refer 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. 2 is a waveform diagram of an embodiment of a partial signal of the electronic device shown in FIG. 1. The electronic device 100 is a variety of suitable types of products, such as a portable electronic product, a smart home electronic product, and an in-vehicle electronic product. The present invention does not limit this. The portable electronic product is, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, or the like. The smart home electronic products are, for example, desktop computers, refrigerators, washing machines, televisions, and the like. The in-vehicle electronic products are, for example, navigators, car DVDs, and the like. The electronic device 100 includes a touch display device 1. The touch display device 1 is used to implement image display and touch sensing. The touch display device 1 is, for example but not limited to, an In-Cell (in-box or in-line) type of touch display device. The touch display device 1 is, for example, a liquid crystal display device. However, the touch display device 1 can 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.

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

In an 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-capacitive touch sensing.

The plurality of common electrodes 101 are arranged, for example, in a two-dimensional array. Specifically, the plurality of common electrodes 101 are arranged in a plurality of rows and columns in the X direction and the Y direction, wherein the X direction is a row direction. The Y direction is the column direction. However, in other embodiments, the plurality of common electrodes 101 may also be arranged in other regular or irregular manners. This application does not limit this. 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 realize driving the touch display panel 10 by synchronously modulating all voltage signals output by the driving chip 20 to the touch display panel 10 by using the modulation signal MGND. In any process of performing normal image display, the common electrode 101 can be further driven to perform self-capacitance touch sensing. Therefore, even when the display resolution of the touch display panel 10 is improved, the time of the touch sensing is not shortened, thereby breaking the technical bottleneck that the touch sensing time caused by the increase in the display resolution is insufficient. 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 refreshing. Thus, the touch sensing of the touch display device 1 is not limited to the line gap I (see FIG. 2) of the image display, and the frame gap is performed.

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

When the driving chip 20 drives the touch display panel 10 while performing image display and touch sensing, elements on the touch display panel 10 are directly driven by the driving chip 20 or indirectly by the driving chip 20 drive. 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 a signal output from the driving chip 20; when the element When not directly driven by the driving chip 20, it is indirectly driven by the driving chip 20, for example, by capacitive coupling, and the capacitive coupling exists, for example, in an element directly driven by the driving chip 20 and indirectly driven by the driving chip 20. Between the components, correspondingly, the signal of the component is superimposed by the modulation signal MGND due to capacitive coupling. Therefore, all voltage signals on the touch display panel 10 are signals modulated by the modulation signal MGND. In addition to capacitive coupling, elements in the touch display panel 10 can also be indirectly driven by the drive chip 20, for example, by components such as resistors.

Correspondingly, when the driving chip 20 drives the touch display panel 10 while performing image display and touch sensing, all voltage signals on the touch display panel 10 are signals modulated by the modulation signal MGND. The voltage signals on the touch display panel 10 all change with the change of the modulation signal MGND. Preferably, each voltage signal on the touch display panel 10 rises as the modulation signal MGND rises, and decreases as the modulation signal MGND decreases.

As such, the driving chip 20 can realize the common electrode 101 simultaneously in any process of driving the touch display panel 10 to perform normal image display by synchronously or approximately synchronously modulating all voltage signals of the touch display panel 10. Perform touch sensing. Further, the touch driving signal may be raised due to being modulated by the modulation signal MGND, and therefore, the touch sensing signal output by the common electrode 101 to the driving chip 20 may be raised accordingly, thereby being The signal-to-noise ratio of the touch sensing of the touch display device 1 is increased, thereby improving the accuracy of the touch sensing of the touch display device 1.

Optionally, the driving chip 20 is configured to drive the plurality of common electrodes 101 to perform touch sensing in a time division manner. For example, the driving chip 20 performs touch sensing each time the partial common electrode 101 is driven, and performs touch sensing for all the common electrodes 101 by multiple driving.

In some specific embodiments, the driving chip 20 may perform image display and touch sensing, for example, driving the common electrode 101 row by row, or may simultaneously drive the plurality of rows of common electrodes 101 to perform image display and touch sensing.

Since the driving chip 20 drives the common electrode 101 to perform self-capacitance touch sensing in a time division (eg, in a row or row by row), the output pin of the driving chip 20 drives all the common electrodes 101 simultaneously. The chip that performs self-capacitance touch sensing has fewer output pins, so that the area of the driving chip 20 can be reduced, thereby achieving cost saving.

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

In different embodiments, the driving chip 20 may drive one row of the common electrodes 101 to perform touch sensing at a time, or may drive the plurality of rows of common electrodes 101 to perform touch sensing at one time, and simultaneously drive all the common electrodes 101 to perform touch simultaneously. Sensing. In addition, the driving chip 20 may not perform touch sensing by the row driving common electrode 101, for example, performing driving touch by the column driving common electrode 101 or driving the common electrode 101 to perform touch sensing or the like in an irregular driving manner. Wait.

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 realizes time-division driving of the plurality of common electrodes 101 to perform self-capacitance touch sensing. In a specific embodiment, the driving chip 20 performs image display and touch sensing to the partial common electrode 101, for example, each time providing a touch driving signal, and the driving chip 20 correspondingly supplies a common voltage to the remaining common electrodes 101. 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 further receives a touch sensing signal output from the common electrode 101 to acquire touch position information of the target object on the touch display panel 10. The target object is, for example, 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 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 refreshing, the common electrode 101 may be further driven to perform self-capacitive touch sensing.

Optionally, the driving chip 20 is used to intermittently drive the touch display panel 10 to perform touch sensing. For example, in an embodiment, the driving chip 20 drives the touch display panel 10 while performing touch sensing and image display for a first predetermined time, and then drives the touch display panel 10 to perform image display. Stop execution The touch sensing device 1 achieves a second predetermined time, and thus the touch display device 1 realizes image display and touch sensing.

When the driving chip 20 drives the touch display panel 10 while performing touch sensing and image display, all voltage signals on the touch display panel 10 or all of the driving chip 20 output to the touch display panel 10 The voltage signals are all 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, and the touch display device 1 All voltage signals on are referenced to the constant voltage signal.

Preferably, the constant voltage signal is a ground signal GND, and the ground signal GND is, for example, a constant voltage signal of 0 V (volts), but is not limited to a constant voltage signal of 0 V, and may be a constant voltage signal close to 0 V. The ground signal GND is typically a voltage signal on the ground of the device of the electronic device 100. The device is also referred to as a system, for example, a negative pole of a power supply of the electronic device 100, and the power supply is a battery. The ground signal GND is also referred to as a system ground voltage, a system ground signal, a device ground voltage, or a device ground signal. Typically, the device is not earthy or absolutely earthy. However, when the electronic device 100 is connected to the earth through a conductor, the device ground may also be the earth's earth.

The modulation signal MGND is a signal that changes with respect to the ground signal GND.

Alternatively, in other embodiments, the driving chip 20 may also perform image display and touch sensing while driving the touch display panel 10 at the same time. Still alternatively, each of the first predetermined times may be the same or different, and each of the second predetermined times may be the same or different.

As can be seen from the above, the touch drive signal is simultaneously used as a common voltage. In order to distinguish that the touch display device 1 performs touch sensing and non-execution touch sensing, the common voltage supplied to the plurality of common electrodes 101 by the driving chip 20 is different, and the touch display device 1 is defined to perform a touch feeling. At the time of measurement, the common voltage supplied to the plurality of common electrodes 101 by the driving chip 20 is a first common voltage Vcl, which is defined when the touch display device 1 performs image display instead of simultaneously performing touch sensing. The common voltage supplied from the chip 20 to the plurality of common electrodes 101 is the second common voltage Vc2.

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 signal that changes 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 be a changed signal compared to the ground signal GND, for example, a square wave signal. 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 smaller than the frequency of the first common voltage Vc1.

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

It can be seen from the above that when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing, the first common voltage Vc1 that the driving chip 20 simultaneously supplies to the plurality of common electrodes 101 is not Both are used as touch drive signals. However, when the driving chip 20 drives the plurality of common electrodes 101 while performing touch sensing, 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 drives the plurality of common electrodes 101 to perform touch sensing in a time division manner, although the driving chip 20 simultaneously supplies the same first common voltage Vc1 to the plurality of common electrodes 101, The circuit structure in which the driving electrode 20 drives the common electrode 101 while performing image display and touch sensing is different from the circuit structure in which the driving common electrode 101 performs only image display. In this regard, the present application will be specifically described below.

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

For a better understanding, reference may be made first to FIG. 5. Generally, the touch display panel 10 includes a plurality of pixel points 11, each of which 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 gradation level of the pixel point 11. When the driving chip 20 drives the touch display panel 10 to perform touch sensing, the display between the common electrode 101 and the pixel electrode 103 after the signals on the common electrode 101 and the pixel electrode 103 are synchronously modulated by the modulation signal MGND The pressure difference does not change, and therefore, the display panel 10 is touched to perform normal image display. The first common voltage Vc1 modulated by the modulation signal MGND can be further used as a touch drive signal. Therefore, in ensuring that the touch display panel 10 performs a normal display 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 point 11 performing the image display refresh and the pixel point 11 performing the image display holding, the signal on the pixel electrode 103 of the pixel point 11 performing the image display refresh is the modulation supplied from the driving chip 20. After the signal, the signal on the pixel electrode 103 of the pixel 11 where the image display is held is superimposed by the capacitive coupling MGND.

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, 1280×720, 1920×1080, 3840x2160. However, the display resolution is not limited thereto. For example, when the display resolution is 2K, 2K may be 1920x1080, or may be 2560X1440 or the like. Similarly, when the display resolution is 4K, 8K, a variety of situations can also be included. For the touch display device 1 of the present application, in any process of its image display, Touch sensing can be further performed, and 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 simultaneously used as the display driving signal and the touch driving signal, the touch display device 1 Image display refresh and self-capacitive touch sensing can be performed simultaneously, and there is no interference or less interference between image display and touch sensing of the touch display device 1.

In addition, when the touch display panel 10 is in a state of non-image display refreshing under the driving of the driving chip 20, for example, a line gap I (shown in FIG. 2) and a frame gap, the driving chip 20 is also The self-capacitive touch sensing can be performed by driving the common electrode 101 together. At this time, the touch display panel 10 as a whole is in a state in which the image display is maintained, 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 touch sensing is not changed. The display voltage difference between the two

electrodes

101, 103 of the pixel 11 (see FIG. 5), correspondingly, the quality of the 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, the manufacturer can set the driving chip 20 to drive the public as needed. The electrode 101 performs a period of touch sensing. Specifically, for example, touch sensing is performed during the entire process or part of the image display. More specifically, for example, during image display refresh and/or line gap I, frame gap, 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-capacitive touch sensing.

It should be noted that, for the plurality of common electrodes 101 as a whole, the driving chip 20 drives the plurality of common electrodes 101 to perform self-capacitance touch sensing. However, for a part of the common electrodes 101 of the plurality of common electrodes 101, the driving chip 20 may perform touch sensing for simultaneously driving the partial 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 to perform touch sensing, and one-time sensing of all the common electrodes 101 is completed by multiple driving.

In the present application, the touch sensing of the plurality of common electrodes 101 is completed by the driving chip 20 by multiple driving, that is, the driving of the driving chip 20 for time-division driving of the plurality of common electrodes 101 is performed. Touch sensing.

Performing self-capacitive touch sensing on the driving chip 20 for driving the plurality of common electrodes 101 in a time-sharing manner, in some embodiments, for example, the driving chip 20 may perform self-capacitive touch sensing by driving the common electrode 101 in a row. Measurement. When the driving chip 20 supplies the first common voltage Vc1 to perform self-capacitance touch sensing and image display for one row of the common electrodes 101, the first common voltage Vc1 is also supplied to perform image display to the common electrodes 101 of the remaining rows. After the driving chip 20 drives a row of common electrodes 101 to perform self-capacitive touch sensing, next, driving another row of common electrodes 101 to perform self-capacitance touch sensing and image display, and driving the remaining rows of common electrodes 101 to perform image display . As such, one touch sensing drive for all of the common electrodes 101 is completed by multiple driving.

It should be noted that the driving chip 20 sequentially drives the common electrodes 101 that perform touch sensing to partially overlap. Or not overlapping.

In particular, for the manner in which the driving chip 20 intermittently drives the touch display panel 10 to perform self-capacitive touch sensing, defining a period in which the common electrode 101 performs touch sensing is the first time period W1, and the plurality of public are defined. The period in which the electrodes 101 perform image display instead of simultaneously performing touch sensing is the second period W2. A second time period W2 is included between adjacent first time periods W1. For example, the first time period W1 and the second time period W2 alternate.

In the first period W1, the driving chip 20 generates the modulation signal MGND, and synchronously modulates an input signal of the touch display panel 10 by using the modulation signal MGND. Correspondingly, the driving chip 20 simultaneously outputs the first common voltage Vcl to perform image display on the plurality of common electrodes 101, and time-receives touch sensing signals from the plurality of common electrodes 101 to obtain Touch the message.

In order to facilitate clear distinction between the signals of the second time period W2 and the following, the voltage signals outputted to the touch display panel 10 by the driving chip 20 during the first time period W1 are all first signals, and the driving chip 20 is defined. The voltage signals output to the touch display panel 10 during the second period W2 are all second signals. Correspondingly, the first signal comprises the first common voltage Vc1.

In each of the second time periods 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 by using the modulation signal MGND. Correspondingly, the first signal is, for example, a signal modulated by the second signal via the modulation signal MGND. The driving chip 20 outputs the first signal to the touch display panel 10 while performing image display and self-capacitive touch sensing.

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

The first common voltage Vc1 is, for example, a signal obtained by the second common voltage Vc2 modulated by the modulation signal MGND. For the liquid crystal display device, the second common voltage Vc2 is, for example, (-1)V. However, for other types of display devices, the second common voltage Vc2 may also be voltage signals of other sizes.

The amplitude of the modulation signal MGND is, for example, a signal between 0.15V and 0.3V. Optionally, 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 signals such as the modulation signal MGND and the second common voltage Vc2 may also be other suitable types of signals.

Since the driving chip 20 does not synchronously modulate the input signal of the touch display panel 10 by using the modulation signal MGND during the second time period W2, for example, the driving chip 20 still adopts an existing display driving manner. The touch display panel 10 is driven, and therefore, the touch display device 1 relatively reduces power consumption in the second period W2 compared to the technical scheme in which modulation is employed in the first period W1.

As can be seen from the above, the driving chip 20 employs a method of intermittently driving the plurality of common electrodes 101 to perform touch sensing. The touch display device 1 can further perform self-capacitance touch sensing not only in any process of performing image display, but also avoids the problem of large power consumption due to the adoption of the modulation scheme.

In the first period W1, the driving chip 20 drives the plurality of rows of common electrodes 101 to perform touch sensing, for example, or drives all of the common electrodes 101 to perform one touch sensing, or drives all of the common electrodes 101 to perform the most. Secondary touch sensing. The case where the driving chip 20 drives all the common electrodes 101 to perform a plurality of touch sensing can be divided into various cases, for example, the driving chip 20 drives all the common electrodes 101 to perform the same number of touch sensing times. Or, the driving chip 20 drives the part of the common electrode 101 to perform the same number of touch sensing times, and drives the other part of the common electrode 101 to perform the same number of times of the touch sensing. However, the driving chip 20 drives the two parts of the common electrode. 101 The number of times the touch sensing is performed is different.

It should be noted that the duration setting of the second time period W2 does not affect the overall touch operation of the touch display device 1 , and vice versa.

The duration of each of the first time periods W1 is, for example, the same, and the duration of each of the second time periods W2 is, for example, the same. The durations of the first time periods W1 may not be identical or different from each other, and the durations of the second time periods W2 may not be identical or different from each other. In addition, for the different types of touch display devices 1 , for the touch display devices 1 having different sizes, the first time period W1 and the second time period W2 of the touch display device 1 having different materials may also be correspondingly different. Further, for the touch display device 1 to operate in different states, for example, a black screen standby state and a bright screen image display state, the durations of the first time period W1 and the second time period W2 may also be different to reduce power consumption. .

In the following, the touch display device 1 and its operation principle will be described mainly in such a manner that the driving chip 20 intermittently and time-divisionally drives the plurality of common electrodes 101 to perform touch sensing.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of a circuit structure of a specific implementation of the electronic device 100 . The driving chip 20 includes a modulation circuit 21, a common voltage generating circuit 22, a touch driving circuit 23, a data selecting circuit 24, a control circuit 25, and a signal processing circuit 26. The common voltage generating circuit 22 and the touch driving circuit 23 are connected to the data selecting circuit 24. The data selection circuit 24 connects 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 are selectively connectable to the corresponding common electrode 101 through the data selecting circuit 24.

The common voltage generating circuit 22 is for driving the common electrode 101 to perform image display.

The touch driving circuit 23 is configured to drive the same common electrode 101 while performing 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 to acquire touch position information.

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

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

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 may be any one of the following five cases:

First: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;

Second: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is a negative voltage;

Third, 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;

Fourth: the voltages of the first reference signal and the second reference signal are positive voltages of different sizes;

Fifth: the voltages of the first reference signal and the second reference signal are negative voltages of different sizes.

Referring to the ground signal GND, 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 the first reference signal and the second reference signal alternately appear.

In this 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. The grounding signal is 0V, and the driving signal is 0.2V. The manufacturer can adjust the amplitude of the modulation signal MGND according to the product, which is not limited in this application.

In addition, taking the signal whose first reference signal is low level and the signal whose second reference signal is high level as an example, preferably, the duration of the first reference signal of the modulation signal MGND is the second reference signal 2 times the duration. 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 twice the duration of the second reference signal, the driving chip 20 performs a reset operation during the first half of the first reference signal, at the first reference The sensing of the touch sensing signal is performed separately during the second half of the signal and during the presence of the second reference signal. In this way, 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 a reset operation, for example, during the presence of the first reference signal, during the presence of the second reference signal Sampling of the touch sensing signals is performed separately.

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

Optionally, the driving chip 20 further includes a voltage generating circuit 27. The voltage generating circuit 27 is configured to generate the second reference signal. The modulation circuit 21 is connected to the device ground of the electronic device 100 and the voltage is generated The circuit 22 receives the ground signal GND on the ground of the device and the second reference signal generated by the voltage generating circuit 22, and generates the modulation signal MGND correspondingly. To distinguish the ground signal GND, the modulation signal is labeled MGND.

In the embodiment, the driving chip 20 synchronously modulates all the voltage signals on the touch display panel 10 by providing the modulation signal MGND to a part of the driving chip 20, thereby driving the touch display panel 10 at the same time. Perform normal image display and touch sensing. That is, as long as the signal on the portion of the ground is the modulation signal MGND, all of the voltage signals of the touch display panel 10 are synchronized to become the signals modulated by the modulation signal MGND.

It can be seen from the above that when the driving chip 20 drives the touch display panel 10 while performing image display and touch sensing, the driving chip 20 includes two parts, wherein a part of the driving signal MGND is loaded. Partially used to load the ground signal GND.

The ground to which the modulation signal MGND is applied in the first period W1 is defined as a modulation ground to distinguish the device ground to which the ground signal GND is applied. Correspondingly, in the first time period W1, the electronic device 100 is based on two domains as a voltage reference. The two fields are shown as a domain 80 referenced to the ground signal GND and a domain 90 referenced to the modulation signal MGND. The ground terminal of the circuit in the domain 80 with reference to the ground signal GND is used to load the ground signal GND, and the ground terminal of the circuit in the domain 90 with reference to the modulation signal MGND is used to load the modulation signal MGND. In other words, in the first period W1, for a circuit that is modulated ground, its reference ground potential is a modulated signal MGND loaded; for a device grounded circuit, its reference ground potential is a device ground. Loaded ground signal GND.

In contrast, in the second time period W2, the electronic device 100 uses a domain as a voltage reference reference, and both use the ground signal GND as a voltage reference. The ground of the circuit 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 modulation ground corresponds to the device ground for transmitting the ground signal GND instead of the modulation signal MGND.

It is to be noted that, in the present embodiment, 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 are located in the field 90 in the first period W1. In addition, the touch display panel 10 is also located in the field 90; the modulation circuit 21 and the voltage generating circuit 27 are located in the domain 80.

The modulation circuit 21 includes a modulation terminal M. The modulation circuit 21 outputs the modulation signal MGND to the ground of each circuit in the domain 90 through the modulation terminal M, so that the circuit output in the domain 90 with the modulation signal MGND as the voltage reference is modulated. The voltage signal modulated by the signal MGND is supplied to the touch display panel 10. Wherein, the modulation terminal M is connected to the modulation ground or as one end of the modulation ground. Further, a signal on the touch display panel 10, for example, an element in a floating state (for example, a pixel electrode 103 for performing image display holding, which will be described later, see FIG. 5) superimposes the modulation signal MGND by capacitive coupling. Therefore, in the first period W1, all of the voltage electrical signals on the touch display panel 10 become signals modulated by the modulation signal MGND.

Circuits in the field 90, for example, the common voltage generating circuit 22, the touch driving circuit 23, and the signal processing power The circuit 26, the data selection circuit 24, and the control circuit 25, if included with the ground terminal, can be directly connected to the modulation ground.

In the second time period W2, the electronic device 100 as a whole is based on the ground signal GND as a voltage reference.

Correspondingly, in the first time 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 generating circuit 27, and provides the modulation signal MGND to the Modulated ground. The common voltage generating circuit 22 correspondingly generates the first common voltage Vc1, and supplies the image display to the corresponding common electrode 101 through the data selecting circuit 24. The touch driving circuit 23 correspondingly generates the first common voltage Vc1, and provides image display and self-capacitance touch sensing to the corresponding common electrode 101 through the data selection circuit 24. The signal processing circuit 26 receives a touch sensing signal output from the touch driving circuit 23 to acquire touch information. That is, the first common voltage Vc1 outputted to the common electrode 101 by the touch driving circuit 23 is simultaneously used as a display driving signal and a touch driving signal, and the first common voltage Vc1 outputted by the common voltage generating circuit 22 to the common electrode 101 is used only. Display drive signal.

The first common voltage Vc1 outputted by the touch driving circuit 23 and the common voltage generating circuit 22 to the plurality of common electrodes 101 is the same signal modulated by the modulation signal MGND, and the touch driving circuit 23 can The touch sensing signal sensed from the common electrode 101 is further transmitted to the signal processing circuit 26 to acquire touch information. Therefore, the driving chip 20 can drive the touch display panel 10 while performing image display and self-capacitive touch sensing.

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

In addition, since the modulation circuit 21 and the touch drive circuit 23 and the like are integrated in the single driving chip 20, and the single chip saves space compared to the plurality of chips, the touch display device 1 occupies the The space of the electronic device 100 is small. In addition, a single chip is more advantageous for assembly and production management of the touch display device 1 than a plurality of chips, thereby improving production efficiency, thereby reducing the manufacturing cost of the electronic device 100.

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

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 derived from the common voltage generating circuit 22. The touch drive circuit 23 may further output a second common voltage Vc2 to the data selection circuit 24, for example, but the data selection circuit 24 selectively outputs a second common voltage Vc2 from the common voltage generation circuit 22 to the plurality of common electrodes 101. Thereby, the touch display device 1 is caused to perform image display at the second time period W2 to stop performing touch sensing.

The first time period W1 and the second time period W2 are alternately performed, and the touch display device 1 implements an image Display and touch sensing.

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

The touch drive circuit 23 is different from the circuit configuration of the common voltage generating circuit 22. The touch drive circuit 23 is capable of further receiving a touch sensing signal output from the common electrode 101. The signal processing circuit 26 acquires touch location information based on the touch sensing signal.

Specifically, the common electrode 101 electrically connected to the touch driving circuit 23 may correspondingly output different touch sensing signals to the touch sensing in response to a touch or proximity of a target object (eg, a suitable object such as a finger) The drive circuit 23, correspondingly, the signal processing circuit 26 can obtain touch position information from the touch sensing signal.

In contrast, the common voltage generating 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 generate a first reference voltage signal. The common voltage generating circuit 22 and the touch driving circuit 23 respectively output the same first common voltage Vc1 as the first reference voltage signal to the plurality of common electrodes 101, wherein the common voltage generating circuit 22 is electrically The connected common electrode 101 performs only image display, and the common electrode 101 electrically connected to the touch drive circuit 23 simultaneously performs image display and self-capacitance touch sensing.

Since the touch driving circuit 23 supplies the same signal to the common electrode 101 as the common voltage generating circuit 22, the touch driving circuit 23 does not affect the execution while driving the common electrode 101 to perform self-capacitive touch sensing. The self-capacitive touch-sensing common electrode 101 simultaneously performs 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 common voltage generating circuit 22 and the signal that the touch driving circuit 23 outputs to the plurality of common electrodes 101 The same or substantially the same can be achieved to ensure the quality of touch sensing and image display.

In some specific embodiments, the common voltage generating circuit 22 includes, for example, a signal source 221, a follower 222, and a voltage stabilizing circuit 223. The signal source 221 is coupled to the follower 222, and the follower 222 is further coupled 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 terminal 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 a signal output from the signal source 221 to the data selection circuit 24, and is supplied 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 be other suitable circuit structures, and It is not limited to the first amplifier. In the specific embodiment, the follower 222 is taken as an example of the first amplifier. The first amplifier 222 includes a third power terminal c1, a third ground terminal d1, a first in-phase terminal e1, a first inverting terminal f1, and a first output terminal g1. The third power terminal c1 is used to load the power voltage VDD1. The third ground terminal d1 is used to connect the modulation ground. The first in-phase end e1 is for connecting to the output end b of the signal source 221. The first inverting terminal f1 is shorted to the first output end g1. 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 for regulating the voltage between the follower 222 and the data selection circuit 24. In the present embodiment, the regulator 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, in the first time period W1, the grounding terminal a and the third grounding terminal d1 receive the modulation signal MGND, and the signal source 221 correspondingly outputs the first reference voltage signal to the output terminal b. The first amplifier 222 is in a virtual short state, and correspondingly outputs a first common voltage Vc1 identical to the first reference voltage signal to the data selection circuit 24 through the data selection circuit 24 Image display is performed for the corresponding common electrode 101.

In the second time period W2, the ground terminal a and the third ground terminal d1 both receive the ground signal GND, and 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 correspondingly transmits a second common voltage Vc2 that is the same as the second reference voltage signal to the data selection circuit 24, and is provided by the data selection circuit 24 to the The plurality of common electrodes 101 perform image display.

The touch drive circuit 23 includes, for example, the signal source 221 and a plurality of operational amplifiers 231. Each operational amplifier 231 includes 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 g2. The fourth power terminal c2 is used to load the power voltage VDD2. The fourth ground terminal d2 is used to connect the modulation ground. The second in-phase end e2 is for connecting to the output end 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 233b. 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 g2.

In operation, in the first period W1, the fourth ground terminal d2 receives the modulation signal MGND. The second amplifier 232 is in a virtual short state, receives a first reference voltage signal from the signal source 221, and correspondingly outputs the first common voltage Vc1 to the data selection circuit 24, through the data selection circuit 24 It is supplied to the corresponding common electrode 101. The feedback branch 233 is configured to transmit a 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 of the operational amplifiers 231 corresponds to a common electrode 101 that can be selectively connected to one column through the data selection circuit 24. However, the number of the plurality of operational amplifiers 231 may be the same as the number of rows of the plurality of common electrodes 101. In addition, the present invention is not limited thereto. For example, the common electrode 101 of each column may also be connected to the second operational amplifier 231, and the like.

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

Further, each of the touch driving circuit 23 and the common voltage generating circuit 22 respectively uses a signal source, and the touch driving circuit 23 and the common voltage generating circuit 22 share the same signal source 221 of the present application. Therefore, the first common voltage Vc1 outputted by the touch drive circuit 23 and the common voltage generating circuit 22 to the plurality of common electrodes 101 through the data selection circuit 24 may be more the same or may be the same, thereby ensuring The image of the touch display device 1 is displayed with the quality of touch sensing.

In a second time period W2, the modulation ground becomes a device ground, the signal source 221 outputs a 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 selectively outputs a second common voltage Vc2 from the common voltage generating circuit 22 to perform image display on the plurality of common electrodes 101.

Further, in some modified implementations, a first switch (not shown) may be disposed between the signal source 221 and the follower 222, and a second switch is disposed between the signal source 221 and the operational amplifier 231 (not shown) Correspondingly, in the first time period W1, both the first switch and the second switch are in a closed state, the second time period W2, the first switch is in a closed state, and the second switch is 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 of the operational amplifiers 231 is connected to a second data selector 242, and each of the second data selectors 242 is connected to a column 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. 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, that is, 26. Each second data selector 242 includes a second output port O2 for outputting from the touch drive circuit 23 The signal is given 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, that is, 26. It should be noted that, in FIG. 2, limited to the illustrated size, only part of the circuit structure is actually shown. For example, only two operational amplifiers 231, two second data selectors 242, and a portion of the common electrode 101 are shown. .

In this embodiment, the second output port O2 of each second data selector 242 is respectively connected to a common electrode 101. Each of the first output ports O1 is connected to a second output port O2 of each of the second data selectors 242 and the common electrode 101, thereby saving the number of the connection lines L, and the different first output ports O1 are connected to each other. Different second output ports O2.

However, in other embodiments, the number of the first data selectors 241 may also be multiple, not limited to one, and correspondingly, the first of the plurality of first data selectors 241 The connection relationship between the output port O1 and the second output port O2 of the plurality of second data selectors 242 can be adjusted accordingly. For example, each first data selector 241 is connected to a portion of the second data selector 242. However, it is also possible that the first output port O1 of each first data selector 241 is connected to a part of the second output port O2 of the plurality of second data selectors 242, and so on.

In the first time period W1, the plurality of second data selectors 242 are 26-selected data selectors under the control of the control circuit 25, and correspondingly, each second data selector 242 outputs the touch drive circuit each time. The first common voltage Vc1 of 23 is given to a common electrode 101, and the plurality of second data selectors 242 drive all of the common electrodes 101 to perform one touch sensing. The first data selector 241 is a 26-select 25 data selector 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 of the same row, The first data selector 241 outputs the first common voltage Vc1 from the common voltage generating circuit 22 to the respective common electrodes 101 of the remaining rows. It should be noted that the 26 touch driving may be completed in one or more first time periods W1.

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

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 be 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, but may be other suitable switching circuit configurations.

Through the data selection circuit 24, on the one hand, the number of connection lines L between the driving chip 20 and the plurality of common electrodes 101 can be reduced, and on the other hand, image display for driving the plurality of common electrodes 101 can be achieved. At the same time, the time-division driving common electrode 101 performs touch sensing.

Alternatively, in some embodiments, the touch display device 1 may also continue to perform both image display and touch sensing, for example, in time, the common voltage generating circuit 22 and the touch driving The circuit 23 continuously supplies the first common voltage Vc1 to the common electrode 101, spatially, the common voltage generating circuit 22 and the The touch drive circuit 23 cooperates to drive the plurality of common electrodes 101. In other words, without the second time period W2, the control circuit 25 correspondingly controls the first data selector 241 to always hold 26 select 25, and controls the plurality of second data selectors 242 to always keep 26 select 1.

Further, when the plurality of common electrodes 101 are arranged in other regular or irregular manners, the data selection circuit 24, the common voltage generating circuit 22, the touch driving circuit 23, and the plurality of common electrodes The relationship between the 101 can be adjusted accordingly. For those skilled in the art, according to the technical content disclosed above, the corresponding circuit information can be reasonably estimated, and therefore, no further details are provided herein.

In addition, in some embodiments, the driving chip 20 may further include, for example, a fingerprint driving circuit that selectively connects the plurality of common electrodes 101 when the driving chip 20 is at the driving portion common electrode 101 When the touch sensing and image display are simultaneously performed, the fingerprint driving circuit can also drive the partial common electrode 101 to simultaneously perform fingerprint sensing and image display, and the common voltage generating circuit 22 drives the partial common electrode 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, and may include other circuits of a suitable type or suitable function, and the corresponding driving common electrode 101 performs a corresponding function.

Please refer to FIG. 3 and FIG. 4 together. FIG. 4 is a schematic diagram showing the circuit structure of an embodiment of the modulation circuit 21. The modulation circuit 21 includes 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. 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, K2 are all connected to the control unit 215. The second transmission end T2 of the first active switch 211 is connected to the first transmission end T3 of the second active switch 213, and defines an output node N on the connection line, and the first transmission end T1 of the first active switch 211 Receiving the first reference signal, the second transmission end T4 of the second active switch 213 receives the second reference signal, and the control unit 215 controls the output correspondingly by controlling the first and second

active switches

211, 213 The node N alternately outputs the first reference signal and the second reference signal to form a modulation signal MGND.

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

The first active switch 211 and the second active switch 213 are, for example, suitable switches of a thin film transistor, a triode, a metal oxide semiconductor field effect transistor, or the like.

The working principle of the modulation circuit 21 is that, in the first time period W1, the control unit 215 is configured to control the modulation circuit 21 to output the modulation signal MGND to the ground in the domain 90, and the ground in the domain 90 is modulated. In the second time period W2, the control unit 215 is configured to control the modulation circuit 21 to output the ground signal GND to the modulation ground, at which time the modulation ground becomes the same as the device ground.

It should be further noted that, in the first time period W1, the electronic device 100 has a reference domain 80 referenced to the ground signal GND and a reference domain 90 referenced to the modulation signal MGND. For the touch display device 1, While the touch driving circuit 23 supplies the touch driving signal to the common electrode 101, the touch sensing signal output from the common electrode 101 itself is further received to acquire touch information, and therefore, the touch driving circuit 23 is at the driving station. The principle when the touch display panel 10 performs touch sensing is the self-capacitance touch sensing principle.

Referring to FIG. 2, FIG. 3, and FIG. 5, FIG. 5 is a schematic diagram of a circuit structure of a specific implementation of the electronic device 100. As described above, in the embodiment, the touch display device 1 is described by taking a liquid crystal display device as an example. However, the circuit structure of the touch display device 1 may be different for all the different types of display devices, and the circuit configurations of different liquid crystal display devices may also be different. However, the structure that can be easily derived by a person of ordinary skill in the art should fall within the protection scope of the present application. In the present embodiment, the touch display panel 10 of the touch display device 1 includes a plurality of pixel dots 11. Each pixel 11 is driven by the drive chip 20 for performing image display and touch sensing. Each pixel 11 includes the common electrode 101, the 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 drive chip 20. The second transfer electrode D is connected to the pixel electrode 103. The driving chip 20 is configured to drive the control switch 105 to be turned on and off.

The control switch 105 is, for example, a thin film transistor switch. The thin film transistor switch is, for example, a low temperature polysilicon thin film transistor switch, an amorphous silicon thin film transistor switch, an indium gallium zinc oxide (IGZO) thin film transistor switch, a high temperature polysilicon thin film transistor switch, or the like. However, the present invention is not limited thereto, and the control switch 105 can also be other suitable types of switches. When the control switch 105 is a thin film transistor switch, the control electrode G is a gate of a thin film transistor switch, the first transfer electrode S is a source of a thin film transistor switch, and the second transfer electrode D is a thin film transistor The drain of the switch.

In the present embodiment, each pixel 11 includes a pixel electrode 103 and a control switch 105, respectively. Since the size of the common electrode 101 is generally larger than the size of the pixel electrode 103, correspondingly, several pixel points 11 can share the same common electrode 101. However, in other modified embodiments, a common electrode 101 may be included for each pixel point 11 respectively. In addition, for other types of display devices such as OLEDs, each pixel 11 may include a plurality of switches and components such as capacitors.

In the first time period W1, the driving chip 20 drives the control switch 105 to turn on by providing the first scan enable signal Vg1, and provides the first gray scale voltage Vd1 to the pixel through the turned-on control switch 105. The electrode 103 supplies a first common voltage Vc1 to the common electrode 101 to drive the pixel point 11 to perform image display refresh. The first scan enable signal Vg1, the first gray scale voltage Vd1, and the first common voltage Vc1 are both signals that are synchronously modulated by the modulation signal MGND.

Generally, the driving chip 20 drives the plurality of pixel dots 11 in rows to perform image display refresh. In the first time period W1, when the driving chip 20 drives the pixel point 11 of a certain row to perform image display refreshing, the driving chip 20 supplies the first scan cutoff signal Vg2 to the control switch 105 of the pixel point 11 of the remaining row. Making the remaining rows The control switch 105 of the pixel 11 is turned off, thereby causing the pixel dots 11 of the remaining rows to be in the image display holding state. The first scan cutoff signal Vg2 is a signal modulated by the modulation signal MGND.

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

In order to avoid the interference of the touch sensing on the image display refresh, preferably, the driving chip 20 simultaneously drives the pixel point 11 performing the touch sensing without overlapping with the pixel point 11 performing the image display refreshing, for example, executing the image. The pixels 11 of the display refreshed pixel point 11 and the common electrode 101 performing touch sensing are spaced apart at a pixel point 11 where image display retention is performed. The pixel point 11 that performs touch sensing and the pixel point 11 that performs image display refresh can be maintained by a predetermined distance without being overlapped by software or hardware or hardware and software control.

In contrast, in the second period W2, the driving chip 20 supplies, for example, a second scan enable signal Vg3 to the control switch 105, activates the control switch 105, and supplies the second gray scale voltage Vd2 to the pixel electrode 103 through the activated control switch 105. Providing the second common voltage Vc2 to perform image display refreshing to the common electrode 101. When the driving chip 20 drives the pixel point 11 of a certain row to perform image display refreshing, the second scan cutoff signal Vg4 is supplied to the control switch 105 of the pixel row 11 of the remaining row, thereby turning off the pixel points 11 of the remaining rows. In the image display hold state.

The first scan enable signal Vg1 is, for example, a signal modulated by the second scan enable signal Vg3 via the modulation signal MGND. The first scan cutoff signal Vg2 is, for example, a signal modulated by the second scan cutoff signal Vg4 via the modulation signal MGND.

The first gray scale voltage Vd1 is a signal modulated by the corresponding second gray scale voltage Vd2 via the modulation signal MGND. For example, when a first gray scale voltage Vd1 is a signal modulated by the modulation signal MGND by the second gray scale voltage Vd2, the voltage difference between the second gray scale voltage Vd2 and the second common voltage Vc2 is equal to the first A pressure difference between the gray scale voltage Vd1 and the first common voltage Vc1.

For each pixel point 11 , the voltage difference between the first pixel electrode 103 and the common electrode 101 determines the display gradation level of each pixel point 11 . For the liquid crystal display device, in order to prevent the liquid crystal molecules from being polarized, the gray scale voltage can be classified into a positive gray scale voltage and a negative polarity gray scale voltage for the same display gray 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, insulated cross-distributions. The plurality of scanning lines 281 extend, for example, in the X direction 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 of the scanning lines 281 is connected to the control electrode G of the control switch 105 of one row of pixel points 11, respectively. Each of the data lines 291 is connected to a first transmission electrode S of a control switch of a column of pixel points 11, respectively.

The plurality of scan lines 281 are configured to transmit the first scan enable signal Vg1, the second scan enable signal Vg3, the first scan cutoff signal Vg2, or the second scan cutoff signal Vg4 from the driving chip 20 to the control switch 105. Control electrode G. The plurality of data lines 291 are used to transmit the first gray scale voltage Vd1 or the second gray scale voltage Vd2 from the driving chip 20 to the first transfer electrode S of the control switch 105.

The drive chip 20 further includes a display drive circuit 20a. The display driving circuit 20a is configured to drive 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 connects the plurality of scan lines 281. The data driving circuit 29 connects 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 configured to control the scan timing of the scan drive circuit 28 and provide corresponding display data to the data drive circuit 29. The scan signal generating circuit 28a is connected to the scan driving circuit 28. The scan signal generating circuit 28a is configured to generate the first scan enable signal Vg1, the second scan enable signal Vg3, the first scan cutoff signal Vg2, or the second scan cutoff signal Vg4, and provide the first scan enable signal Vg1, the second scan enable signal Vg3, the first scan cutoff signal Vg2, or the second scan cutoff signal Vg4 are supplied to the scan driving circuit 28. The scan driving circuit 28 includes, for example, a circuit structure of a shift register, receives a scan enable signal and a scan cutoff signal from the scan signal generating circuit 28a, and correspondingly provides a scan enable signal and a scan cutoff signal to the corresponding control under the control of the control circuit 25. Scan line 281.

In the present embodiment, in operation, in the first period W1, the scan signal generating circuit 28a, the scan driving circuit 28, and the data driving circuit 29 are also located in the field 90. The scan signal generating circuit 28a is modulated by the modulation signal MGND of the modulation circuit 21 to output the first scan enable signal Vg1, the first scan cutoff signal Vg2 to the scan drive circuit 28, and the scan drive circuit 28 correspondingly outputting the first scan enable signal Vg1 and the first scan cutoff signal Vg2 to the corresponding scan line 281 under the timing control of the control circuit 25, and the data drive circuit 29 is modulated by the modulation circuit 21. The modulation of the signal MGND outputs the first gray scale voltage Vd1 to the plurality of data lines 291 to be supplied to the corresponding pixel electrode 103 through the activated control switch 105 to perform image display refresh. The common voltage generating circuit 22 and the touch driving circuit 23 supply the first common voltage Vc1 to the plurality of common electrodes 101 through the data selecting circuit 24.

Further, the signal on the pixel electrode 103 of the pixel point 11 held by the image display becomes a signal modulated by the modulation signal MGND by capacitive coupling. 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 that are synchronously modulated by the modulation signal MGND. Thereby, the drive chip 20 can 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 supplies the first scan enable signal Vg1 to a scan line 281, the common voltage generating circuit 22 provides the first common voltage Vc1 to perform image display on the partial common electrode 101. The touch driving circuit 23 supplies the first common voltage Vc1 to perform image display and self-capacitance touch sensing to the remaining common electrodes 101.

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, compared to the touch display device of the Incell type that performs touch sensing with the existing multiplexing common electrode, thereby The signal for driving the common electrode 101 to perform image display can be further used as a touch driving signal. Therefore, when the driving chip 20 supplies the first scan-on signal Vg1 to the scan line 281, the common electrode 101 can also be executed. Capacitive touch sensing, correspondingly, the touch display device 1 is not necessarily limited to driving the common electrode 101 to perform touch sensing in the line gap I, the frame gap, and thus, there is no touch feeling for the display device with improved display resolution. A technical problem that is not enough time to measure. In addition, the touch display device 1 performs touch sensing in any process of displaying an image, and has no influence or influence on normal display of the image.

It should be noted that the first common voltage Vc1 outputted by the driving chip 20 to the plurality of common electrodes 101 are the same, and the first common voltage Vc1 is a changed signal compared to the ground signal GND, and thus, The first common voltage Vc1 may be further used as a touch driving signal, and accordingly, the driving chip 20 may further drive the common electrode 101 to perform self-capacitance touch sensing while driving the common electrode 101 to perform normal image display.

In addition, in the second period W2, the scan signal generating circuit 28a outputs the second scan enable signal Vg3 and the second scan cutoff signal Vg4 to the scan driving circuit 28, and the scan driving circuit 28 is in the control circuit. The second scan enable signal Vg3 is outputted to the corresponding scan line 281, and the data drive circuit 29 outputs the second gray scale voltage Vd2 to the plurality of data lines 291. To be supplied to the corresponding pixel electrode 103 through the activated control switch 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 the liquid crystal display device, the second common voltage Vc2 generally selects a constant voltage signal that is constant with respect to the ground signal GND, for example, (-1)V. In the first time period W1, the modulation signal MGND is, for example, a periodically varying signal, the frequency is, for example, 200 kHz and the amplitude is 0.2 V, that is, the first reference signal of the modulation signal MGND is 0 V, and the second reference signal is 0.2 V. 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 outputs the modulation signal MGND to the touch drive circuit 23, and the modulation circuit 21 outputs the modulation signal MGND to other circuits having the ground terminal in the field 90, such as a common voltage generation circuit. 22. Scanning signal generating circuit 28a and the like. However, those skilled in the art can clearly know from the above description that the modulating circuit 21 has an output modulated signal MGND to other circuits in the field 90 having a ground terminal.

In some embodiments, the driver chip 20 may also not drive all of 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 by, for example, GIP (Gate In Panel) technology, and is not integrated in the driving chip 20.

Similarly, the data selection circuit 24 can also be formed on the touch display panel 10, such as by GIP technology, rather than being integrated into the driver chip 20.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is an exploded perspective view of an embodiment of the touch display panel 10 of FIG. FIG. 7 is a cross-sectional structural view of the touch display panel 10 of FIG. 6. The touch display panel 10 includes a A 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 be modified, and in other embodiments, may correspond to other display media. The pixel electrode 103 of the plurality of pixel points 11 and the control switch 105, the plurality of scanning lines 281, and the plurality of data lines 291 are all 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 film substrate, or the like.

The second substrate 107, and the pixel electrode 103 disposed on the second substrate 107, the control switch 105, the plurality of scan lines 281, and the plurality of data lines 291 are generally collectively referred to as an Array substrate. . In contrast, a color filter (not shown) is disposed on the first substrate 106 to implement color image display. The first substrate 106 and the color filter are generally collectively referred to as a color filter (CF) substrate. One side of the first substrate 106 facing away from the second substrate 107 is used for image display and receiving touch sensing. However, the color filter may also be placed on the second substrate 107. In some types of display devices, the color filters may also be omitted, and alternatively, light sources of three colors of red, green, and blue may be used for illumination. In addition, for different types of display devices, the side of the second substrate 107 facing away from the first substrate 106 can also be used for image display and receiving touch sensing. The touch display panel 10 is again a double-sided touch display panel. The present invention does not impose any specific limitation on 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 the present 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 on the same layer, and the two are stacked. In addition, since the touch display device 1 is an example of a liquid crystal display device, the liquid crystal display device is a liquid crystal display device of a Fringe Field Switching (FFS). The plurality of common electrodes 101 are respectively provided with slits 101a. Thereby, a fringe electric field is formed with the pixel electrode 103. In this embodiment, the plurality of pixel electrodes 103 may not be provided with slits, and each is a whole piece of electrodes. However, the plurality of pixel electrodes 103 may be provided with slits to improve the edge. Electric field strength.

Please refer to FIG. 8 and FIG. 9 together. FIG. 8 is a cross-sectional structural diagram of another embodiment of the touch display panel 10 shown in FIG. 5. FIG. 9 is a top plan view of the touch display panel 10 of FIG. 8. The plurality of common electrodes 101 may also be disposed between the pixel electrode 103 and the second substrate 107. The plurality of common electrodes 101 and the plurality of pixel electrodes 103 are stacked one on another. The plurality of pixel electrodes 103 are respectively provided with slits 103a to form a fringe electric field with the common electrode 101. In this embodiment, the plurality of common electrodes 101 may not be provided with slits, each of which is a whole piece of electrodes. However, the plurality of common electrodes 101 may be provided with slits to improve the edges. Electric field strength.

In addition, 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 type (Twisted Nematic, TN) LCD The display panel, or the touch display panel 10 is any other suitable type of display panel. Wherein, for the liquid crystal display panel of IPS, 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 to 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 used to supply a power supply voltage to the touch display device 1. The main control chip 3 can be a single chip or a chipset. When the master chip 3 is a chipset, the chipset includes an application processor (AP) and a power chip. Additionally, 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 terminal 31 is connected to the driving chip 20 for supplying power to the driving chip 20. The ground terminal 33 is connected to the device ground and receives the ground signal GND of the device ground. In the first period W1 and the second period W2, the main control chip 3 is based on the ground signal GND as a voltage reference.

The main control chip 3 supplies display data and associated control signals to the display drive circuit 20a, for example. 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 supplies, for example, a power supply voltage signal (VDD1, VDD2) to circuits such as the touch drive circuit 23 and the common voltage generation circuit 22. The touch drive circuit 23 provides a touch drive signal to the common electrode 101 to perform touch sensing, and the master control chip 3 receives a signal output from the signal processing circuit 26, corresponding to whether the control electronic device 100 performs a corresponding function. In addition, the main control chip 3 controls the data selection circuit 24 by controlling the control circuit 25 to control the timing at which the driving chip 20 drives the common electrode 101 to perform touch sensing, for example, by providing a control signal to the control circuit 25.

It should be noted that, in the first time period W1, since the main control chip 3 is located in the domain 80, the circuit such as the display driving circuit 20a and the touch driving circuit 23 is located in the domain 90. Therefore, the master located in the domain 80 The signal transmission between the chip 3 and the circuits such as the display driving circuit 20a and the touch driving circuit 23 in the field 90 is subjected to, for example, level shift processing to satisfy the withstand voltage requirement of the electronic component. In contrast, in the second period W2, if signal transmission between the main control chip 3 and the display driving circuit 20a, the touch driving circuit 23, and the like is to be subjected to level conversion processing, level conversion processing is performed if the level is not required. In the conversion processing, the level conversion processing is not performed.

Referring to FIG. 3, FIG. 10 and FIG. 11, FIG. 10 is a structural block diagram of an embodiment of the signal processing circuit 26 shown in FIG. 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. The signal processing circuit 26 includes a plurality of signal processing units 261. Each of the signal processing units 261 is connected to an operational amplifier 231 for processing and calculating the sensing signals output from the operational amplifier 231 to obtain touch information.

The signal processing unit 261 includes an analog-digital signal conversion unit 263 and a calculation unit 265. The analog-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 calculating unit 265 is based on the digital signal Calculate the touch coordinates. The computing unit 265 is connected to the main control chip 3 for outputting a signal indicating touch coordinates to the main control chip 3. The main control chip 3 controls the electronic device 100 to perform a corresponding function according to the signal indicating the touch coordinates.

It should be noted that the configuration of the signal processing circuit 26 is not limited to the configuration shown in FIG. 10. For example, the plurality of operational amplifiers 231 may share a signal processing unit 261 instead of each of the operational amplifiers 231. A signal processing unit 261 is connected.

In addition, it is also possible to add a corresponding circuit module or a part of the circuit module in the operational amplifier 231 and the signal processing unit 261, or it is also possible to implement the same function by using other circuit modules or circuit units. Specifically, for example, a filtering unit is further included between the analog-digital signal converting unit 263 and the second output terminal g2, and the filtering unit performs filtering processing on the signal outputted by the second output terminal g2, and then outputs the filtered signal to Analog-to-digital signal conversion 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, 90 are different, when signal transmission between the two

domains

80, 90 is required, The signal is level-shifted to meet the withstand voltage requirements of the electronic components. Accordingly, the driving chip 20 may further include a level converting unit 264. The level shifting unit 264 spans two

domains

80,90. For example, the calculation unit 265 connects the main control chip 3 through the level conversion unit 264. The level converting unit 264 is configured to level-convert the signal indicating the touch coordinates output by the calculating unit 265, and then output the level-converted signal to the main control chip 3.

Please refer to FIG. 12 , which is a schematic structural diagram of still another embodiment of the electronic device 100 . The touch display panel 10 may further include a ground element, such as a ground line L1. The ground line L1 is disposed, for example, around the plurality of pixel points 11. However, the grounding element is not limited to the ground line L1. In addition, the scan driving circuit 28 can be integrated, for example, on the touch display panel 10 (Gate In Panel, GIP). Accordingly, the ground element can also be a ground element in the scan driving circuit 28. The ground line L1 may also be omitted in other embodiments.

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

For example, the ground terminal of each circuit located in the field 90 is connected between the modulation circuit 21 and the first ground terminal 201, and the ground terminal of each circuit located in the domain 80 is connected to the modulation circuit 21, for example. Between the second ground ends 203.

The driving chip 20 may further include, for example, a slope controller 204 coupled to the modulation circuit 21 for controlling a slope of a modulation signal output by the modulation circuit 21 to reduce electromagnetic interference (EMI). . In addition, the slope controller 204 is disposed, for example, in a domain 80 referenced to GND. However, in other embodiments, the slope controller 204 can also be omitted.

The driver 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 conversion unit 264. The level converting unit 264 is further connected to the control circuit 25. The display processing circuit 205 is configured to perform corresponding processing (eg, storage, decompression, color adjustment, etc.) on the display data from the main control chip 3. The level converting unit 264 is disposed between the display processing circuit 205 and the control circuit 25 for level-converting the display data processed by the display processing circuit 205, and outputting the level-converted display data. The control circuit 25 is given. The control circuit 25 outputs corresponding display data and timing signals to the display driving circuit 20a. The display driving circuit 20a converts the received display data into a gray scale voltage, and outputs a first gray scale voltage Vd1 to the corresponding pixel electrode 103 to perform image display refresh in the first period W1 according to the timing signal, in the second period W2 outputs the second gray scale voltage Vd2 to perform image display refresh on the corresponding pixel electrode 103. The display data is preferably a digital signal.

It should be noted that, in the second time period W2, when the modulation ground scheme is not adopted, if the signal between the display processing circuit 205 and the control circuit 25 does not need level conversion, the display processing circuit 205 and the control circuit are The signal between 25 may not be level-converted, but in the first period W1, a modulation scheme is employed, since the domain 80 is different from the voltage reference of the domain 90, level conversion is required.

In the present embodiment, the division of each of the circuit modules or circuit units in the drive chip 20 in the two

domains

80, 90 is: display drive circuit 20a, touch drive circuit 23, signal processing circuit 26, data selection circuit 24, And the control circuit 25 are both divided into the domain 90 with reference to MGND. In addition, the touch display panel 10 is also divided into the domain 90; the modulation circuit 21, the display processing circuit 205, the voltage generating circuit 27, and the slope controller 204 are all divided. In domain 80 referenced to GND; level shifting unit 264 spans two domains, i.e., a portion is in domain 80 and a portion is in domain 90, as is known to those of ordinary skill in the art in view of the present application and The circuit principle is that the level conversion unit 264 can be determined to be located in the domain 80 and the domain 90, respectively, and details are not described herein.

Alternatively, the partitioning manner of the driving chip 20 in the two

domains

80 and 90 may be other suitable conditions, and is not limited to the partitioning described in the above embodiment.

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 accordingly, for example, the modulation opposite to the modulation signal MGND. Wait.

In addition, the amplitude of the modulation signal MGND is changed to about 0.2V, so as not to affect the normal operation of the level conversion unit 264, the level of the signal according to the incoming chip 3 and the device type of the level conversion unit 264 are required. Changed.

Further, since the voltage of 0.2 V is relatively small with respect to the voltage of 1.8 V, 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 can be selected without performing. Level shifting, or the level shifting unit 264 may be set, for example, only in the field 80 to level shift the signal output from the signal processing circuit 26.

Since the voltage signal of the touch display panel 10 when performing touch sensing is synchronously modulated by the modulation signal MGND as a whole, the driving chip 20 supplies the display driving signal for performing image display to the common electrode 101, that is, a common voltage, such as The second common voltage Vc2, after being modulated by the modulation signal MGND, can be simultaneously applied to the driving common electrode 101 to perform touch sensing, thereby further driving the common electrode 101 while ensuring that the touch display panel 10 performs normal image display. The touch sensing is performed, and the signal-to-noise ratio of the touch display device 1 can also 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, a part is in the domain 90 based on MGND, In order to prevent this phenomenon, the electronic device 100 may further include a protection circuit 15 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. The first power terminal 206 is located in the domain 90. The second power terminal 207 is connected to the power supply terminal 31 of the main control chip 3. The main control chip 3 outputs a power voltage to the second power 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 (ie, a second reference signal), the protection circuit 15 correspondingly disconnects the connection between the first power terminal 206 and the second power terminal 207; When the modulation signal MGND is the ground signal GND (ie, the first reference signal), the protection circuit 15 correspondingly closes the connection between the first power terminal 206 and the second power terminal 207.

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

Please refer to FIG. 13. FIG. 13 is a schematic diagram showing the circuit structure 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 terminal 207, and the cathode of the diode J1 is connected to the first power terminal 206.

Optionally, the protection circuit 15 further includes a first capacitor Q1 and a second capacitor Q2. 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 to the cathode of the diode J1 and the modulation loaded with the modulation signal MGND. Between the ground. The first capacitor Q1 and the diode J1 are disposed in the domain 80, and the second capacitor Q2 is disposed in the domain 90.

The protection circuit 15 is not limited to the above embodiments. For example, please refer to FIG. 14. FIG. 14 is a schematic diagram of a circuit structure of another embodiment of the protection circuit 15. In order to clearly distinguish the protection circuit 15 shown in Fig. 13, the protection circuit shown in Fig. 14 is denoted as 15a. The protection capacitor 15a includes a third active switch 151 and a control unit 153. Place 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 and 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 first power terminal 206 and the The connection between the second power terminals 207 is described. The third active switch 151 is 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 can also modulate all the signals of the touch display panel 10 by modulating the power supply or the reference power in the driving chip 20, without limitation. Modulate the equipment ground. For example, the modulation terminal M of the modulation circuit 21 can be connected or used as the aforementioned first power terminal 206 (when modulating the power supply), in addition to being connectable or used as the aforementioned first ground terminal 201 (when modulating the ground) ). The modulation circuit 21 is connected between the first power terminal 206 and the second power terminal 207 when connected or used as the first power terminal 206. The first power terminal 206 is also referred to as a power supply terminal with respect to the first ground terminal 201, and the voltages applied by the two are kept constant.

In addition, in addition to the first power terminal 206 and the first ground terminal 201, the driving chip 20 generally includes a reference power terminal (not shown), when the first power terminal 206 is used to load the first power voltage, When a ground terminal 201 is used to load a second power voltage, the reference power terminal is used to load a third power voltage, and the height of the third power voltage is between the first power voltage and the second power voltage. Meanwhile, the voltage difference between the first power voltage and the second power voltage is kept constant, and the voltage difference between the first power voltage and the third power voltage is kept constant. The reference power supply terminal can also be used or connected to the modulation terminal. That is, one of the power supply terminal, the reference power terminal, and the first ground terminal is used as or connected to the modulation terminal, and correspondingly, the power supply voltage used as or connected to the modulation terminal includes a modulation signal.

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

Please refer 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 deposit The storage circuit 2051, the decompression circuit 2053, and the color adjustment circuit 2055 are sequentially connected. 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 by a level conversion 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 display data from the main control chip 3, and output the compressed display data to the color adjustment circuit 2055. The color adjustment circuit 2055 performs color adjustment on the received display data, for example, performs color enhancement processing or the like on the display data, and outputs the adjusted display data to the level conversion unit 264. The level converting unit 264 level-converts the received display data, and outputs the level-converted display data to the control circuit 25.

The control circuit 25 outputs corresponding display data and timing signals to the data driving circuit 29, and further outputs timing signals to the scan driving circuit 28. The scan driving circuit 28 correspondingly outputs a corresponding scan enable signal to the scan line 281 according to the timing signal. The data driving circuit 29 converts the received display data into a gray scale voltage, and outputs a corresponding gray scale voltage to the corresponding data line 291 according to the timing signal to perform image display refresh.

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

In addition, some components or combination circuits and the like may be reduced or added to the touch display device 1 and the electronic device 100 of the embodiments of the present application, as long as the common knowledge and prior art are known to those skilled in the art. The technical solutions that can be reasonably derived in conjunction with the technical content of the present application should fall within the protection scope of the present application.

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 converting unit 264 are all integrated in the single driving chip 20, the single chip The chip saves space compared to a plurality of chips, and therefore, the touch display device 1 occupies less space in the electronic device 100. In addition, a single chip is more advantageous for assembly and production management of the touch display device 1 than a plurality of chips, thereby improving production efficiency, thereby reducing the manufacturing cost of the electronic device 100.

The above embodiments are described by taking the driving chip 20 driving the common electrode 101 to perform self-capacitive touch sensing as an example. However, the present application is not limited thereto, as long as the touch display device is improved based on the same or similar ideas. , should fall within the scope of protection of this application.

In addition to the various embodiments of the multiplexed common electrode described above for self-capacitive touch sensing, the present application can also perform touch sensing by additionally providing a layer of touch sensing electrodes, and these embodiments are also possible.

Although the embodiments have been described herein with respect to specific configurations and operational sequences, it should be understood that alternative embodiments may add, omit, or change elements, operations, and the like. Accordingly, the embodiments disclosed herein are meant to be illustrative rather than limiting.

Claims

a driving chip for driving a touch display panel to perform image display and touch sensing, wherein the touch display panel includes a plurality of common electrodes; the driving chip is configured to drive the plurality of common electrodes to perform image display, And a method for intermittently driving the plurality of common electrodes to perform touch sensing, defining that a period in which the common electrode performs touch sensing is a first time period, and defining a time period in which the plurality of common electrodes are not performing touch sensing is a second time a period of time; the driver chip includes:

a first ground end, wherein a voltage signal output by the driving chip to the touch display panel is based on a voltage signal on the first ground end;

a modulation circuit, configured to generate a modulation signal to the first ground end during a first time period, and generate a constant voltage signal to the first ground end during a second time period;

a touch driving circuit for simultaneously performing image display and self-capacitive touch sensing while driving the same common electrode in a first period; and a common voltage generating circuit for driving the plurality of common electrodes to perform image display in a second period of time.
The driving chip according to claim 1, wherein a voltage signal of said driving chip to said touch display panel is synchronously modulated by said modulation signal during said first period, said driving chip driving said touch display While the panel performs image display, the common electrode is further driven to perform self-capacitance touch sensing.
The driving chip according to claim 2, wherein said touch driving circuit is configured to time-divisionally drive said plurality of common electrodes to perform touch sensing, and in said first period of time, said touch driving circuit and said partial common electrode When electrically connected, the common voltage generating circuit is electrically connected to the remaining common electrodes, and the touch driving signal supplied from the touch driving circuit to the common electrode is the same as the first common voltage supplied from the common voltage generating circuit to the common electrode.
A driving chip according to claim 3, wherein for the same common electrode, when said touch driving circuit supplies said touch driving signal to said common electrode, further receiving touch sensing from said common electrode output signal.
The driving chip according to claim 4, wherein the touch driving signal supplied from the touch driving circuit to the common electrode and the first common voltage supplied from the common voltage generating circuit to the common electrode are the same voltage signal. The modulated signal is modulated.
The driving chip according to any one of claims 1 to 5, wherein the touch display panel further comprises a plurality of pixel electrodes for forming with the plurality of common electrodes a fringe electric field or a parallel electric field; during a first period of time, the driving chip drives the plurality of pixel electrodes by providing a first gray scale voltage, providing the same first common voltage and a touch driving signal to the plurality of common electrodes to drive The touch display panel performs image display refreshing, further driving the common electrode to perform self-capacitive touch sensing, wherein the first gray scale voltage, the first common voltage, and the touch driving signal are all accompanied by the modulation The rise in signal rises and decreases as the modulation signal decreases.
A driving chip according to claim 6, wherein at the same time, said driving chip supplies at least one row of common electrodes between a pixel electrode supplied to the first gray scale voltage and a common electrode supplied to the touch driving signal.
A driving chip according to claim 1, wherein said first period of time and said second period of time alternate.
The driver chip of claim 6 wherein said constant voltage signal is a ground signal.
A driving chip according to claim 4, wherein said driving chip further comprises signal processing circuit, said signal processing circuit is connected to said touch driving circuit, said signal processing circuit is operative to receive according to said touch driving circuit The touch sensing signal is obtained to obtain touch position information.
A driver chip as claimed in claim 10, wherein the voltage signal on said signal processing circuit is referenced to a voltage signal on said first ground terminal.
A driving chip according to claim 6, wherein said common voltage generating circuit and said touch driving circuit are selectively connectable to said plurality of common electrodes via a data selecting circuit.
A driver chip according to claim 14, wherein said driver chip comprises said data selection circuit.
A driving chip according to claim 15, wherein said data selection circuit comprises a first data selector and a plurality of second data selectors, wherein said first data is selectively connected to said common voltage generating circuit And further for connecting to the plurality of common electrodes; the plurality of second data selectors are coupled to the touch drive circuit, and each of the second data selectors is for connecting a portion of the common electrode.
The driving chip according to claim 6, wherein the driving chip further comprises a second ground end, wherein the second ground end is used to connect to the device ground, and receives a ground signal; the modulation circuit is connected to the The first ground end and the second ground end are configured to generate the modulation signal according to the ground signal and a driving signal.
A driving chip according to claim 17, wherein said driving signal has a level higher than a level of said ground signal.
A driving chip according to claim 17, wherein said driving chip further comprises a display driving circuit, a display processing circuit, and a level converting unit, said display processing circuit for receiving display data from a main control chip And storing, decompressing, and color-adjusting the display data, and outputting the adjusted display data to the level conversion unit, wherein the level conversion unit performs level conversion on the display data, and And outputting the converted display data to the display driving circuit, and the display driving circuit generates a corresponding gray scale voltage corresponding to the plurality of pixel electrodes according to the received display data.
A driving chip according to claim 19, wherein said voltage signal on said display driving circuit is based on a voltage signal on said first ground terminal, and said voltage signal on said display processing circuit is said The voltage signal on the two ground terminals is the reference.
The driving chip according to claim 1, wherein said modulation signal comprises a first reference signal and a second reference signal, said first reference signal having a level lower than a level of said second reference signal, The duration of the first reference signal is greater than or equal to the duration of the second reference signal.
A driving chip according to claim 21, wherein the duration of said first reference signal is twice the duration of said second reference signal.
A driving chip according to claim 21, wherein said modulation signal is a periodically varying square wave signal.
A touch display device includes a touch display panel for driving an image display and a touch sensing by the touch display panel, wherein the driving chip is any one of the above claims 1-23 The driver chip described in the item.
An electronic device comprising the touch display device of claim 24.