CN209803754U - Driver chip, touch display device, and electronic equipment - Google Patents

Abstract

The utility model provides a driver chip, touch display device and electronic equipment. The driving chip can be used for further driving the touch display panel to perform touch sensing in any process of driving the touch display panel to perform image display. The touch display panel includes a plurality of common electrodes. The driving chip includes: a first ground terminal; the modulation circuit is connected with the first grounding terminal and is used for generating a modulation signal to the first grounding terminal; the touch driving circuit is selectively connected with the plurality of common electrodes and is used for driving the plurality of common electrodes to perform touch sensing; and a common voltage generating circuit selectively connected to the plurality of common electrodes for driving the plurality of common electrodes to perform image display. When the modulation circuit outputs the modulation signal to the first ground terminal, the touch driving circuit is configured to drive the same common electrode to simultaneously perform image display and touch sensing.

Description

Driver chip, touch display device, and electronic equipment

technical field

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

Background technique

For a touch display device, especially a touch display device that multiplexes common electrodes to perform touch sensing, in order to reduce the interference between touch sensing and image display refresh, the manufacturer usually adopts the practice of: controlling the touch display panel to perform touch sensing in a time-sharing manner Measurement and image display refresh. For example, in one embodiment, the touch sensing of the touch display panel is driven during line or frame gaps of image display.

Of course, with the gradual increase of the resolution of the touch display panel, for example, the resolution of the liquid crystal display panel of the mobile phone gradually adopts 2K (eg, 2560×1440) resolution or even higher resolution, and the display refresh frequency generally adopts 60HZ, the line gaps and frame gaps will be significantly compressed. If the touch sensing electrodes are driven only in the line gaps and frame gaps to perform touch sensing, the touch sensing cannot be fully performed due to the obvious lack of time. question. 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 utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention needs to provide a driving chip, a touch display device, and an electronic device capable of driving a touch display panel to simultaneously perform image display and touch sensing.

The utility model provides a driving chip, which can be used to further drive the touch display panel to perform touch sensing in any process of driving a touch display panel to perform image display, the touch display panel includes a plurality of common electrodes, and the touch display panel includes a plurality of common electrodes. The driver chip includes:

a first ground terminal, the voltage signals output by the driving chip to the touch display panel are all based on the voltage signal on the first ground terminal;

a modulation circuit, connected to the first ground terminal, for generating a modulation signal to the first ground terminal;

a touch driving circuit, selectively connectable to the plurality of common electrodes, for driving the plurality of common electrodes to perform touch sensing; and

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

When the modulation circuit outputs the modulation signal to the first ground terminal, the touch driving circuit is configured to drive the same common electrode and perform image display and touch sensing simultaneously.

Since the voltage signals output by the driving chip to the touch display panel are all based on the voltage signal on the first ground terminal, when the modulation circuit outputs the modulation signal to the first ground terminal , the voltage signals output by the driving chip to the touch display panel are all synchronously modulated by the modulation signal. Therefore, the touch driving circuit does not affect the normal image display of the touch display panel while driving the touch display panel to perform touch sensing. Therefore, even when the resolution of the touch display panel is increased, the time required for touch sensing will not be affected. Thus, the user experience is improved.

In addition, the modulation circuit and the touch driving circuit are both located in the same driving chip, instead of being located in two chips respectively, so that the pins connected between the chips can be saved, and the volume of the electronic device occupied by the chip can be reduced. , In addition, it is also conducive to production management, improve production efficiency, and then reduce product production costs.

Optionally, when the touch driving circuit drives the touch display panel to perform touch sensing, the voltage signals on the touch display panel are all based on the voltage signal on the first ground terminal.

Optionally, when the touch driving circuit drives the touch display panel to perform touch sensing, the voltage signals on the touch display panel all increase with the increase of the modulation signal, and the voltage signal on the touch display panel increases with the increase of the modulation signal. decrease and decrease.

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

Optionally, the touch driving circuit is configured to drive the plurality of common electrodes to perform touch sensing in a time-sharing manner, and when the touch driving circuit drives some of the common electrodes to perform image display and touch sensing, the common voltage generating circuit The remaining common electrodes are driven to perform image display.

Optionally, when the touch driving circuit is used to drive the plurality of common electrodes to perform touch sensing in time division, the touch driving circuit output to the common electrodes and the common voltage generating circuit output the touch driving signal to the common electrodes. The first common voltage is the same.

Optionally, the touch driving signal and the first common voltage are signals modulated by the modulation signal by the same voltage signal.

Optionally, the modulation circuit further outputs a ground signal to the first ground terminal, and the modulation circuit is configured to alternately output the modulation signal and the ground signal to the first ground terminal.

Optionally, when the modulation circuit outputs the ground signal to the first ground terminal, the driver chip stops driving the touch display panel to perform touch sensing.

Optionally, the driving chip further includes a second ground terminal and a voltage generating circuit, the second ground terminal is used for connecting to a device ground and receiving the ground signal, and the voltage generating circuit is used for generating the driving signal; the The modulation circuit is connected between the first ground terminal and the second ground terminal, and is further connected with the voltage generating circuit; the modulation circuit generates the modulation signal according to the ground signal and the drive signal .

Optionally, the voltage signal on the voltage generating circuit is based on the ground signal.

Optionally, after the modulation circuit continues to output the modulation signal for a first predetermined time, the modulation circuit continues to output the ground signal for a second predetermined time.

Optionally, the touch driving circuit includes a signal source and a plurality of operational amplifiers, each operational amplifier is connected to the signal source, and can be selectively connected to part of the common electrodes; the common voltage generating circuit includes the signal source, A follower, and a voltage-stabilizing circuit; the follower is connected between the signal source and the voltage-stabilizing circuit, and the follower can be further selectively connected to the plurality of common electrodes.

Optionally, when the modulation circuit outputs the modulation signal to the first ground terminal, the signal source outputs a first reference voltage signal to the plurality of operational amplifiers and the followers, the plurality of The operational amplifier outputs the same touch drive signal as the first reference voltage signal to some common electrodes, the follower outputs the same first common voltage as the first reference voltage signal to the rest of the common electrodes, and the voltage regulator The circuit is used for regulating the voltage of the first common voltage output by the follower.

Optionally, the driver chip further includes a control circuit, the control circuit is configured to be connected to a data selection circuit, the follower can be selectively connected to the plurality of common electrodes through the data selection circuit, each The operational amplifier can be selectively connected to part of the common electrodes through the data selection circuit.

Optionally, when the modulation circuit outputs the modulation signal to the first ground terminal, the data selection circuit is controlled by the control circuit, and the common voltage generating circuit drives the plurality of common electrodes in time-division To perform image display, the touch driving circuit drives the plurality of common electrodes to perform image display and touch sensing in a time-divisional manner.

Optionally, when the modulation circuit outputs the ground signal to the first ground terminal, the data selection circuit is controlled by the control circuit, and the common voltage generating circuit is respectively connected to the plurality of common electrodes , the touch driving circuit disconnects the connection with the plurality of common electrodes.

Optionally, the driving chip includes the data selection circuit.

Optionally, the driver chip further includes a plurality of signal processing circuits connected to the plurality of operational amplifiers, and the plurality of operational amplifiers are further configured to receive touch sensing signals output from the common electrodes, the plurality of signals The processing circuit is used for obtaining touch position information according to the touch sensing signal.

Optionally, the voltage signals on the plurality of signal processing circuits are all based on the voltage signal on the first ground terminal.

Optionally, the driving chip further includes a level conversion unit, the plurality of signal processing circuits are connected to the level conversion unit, and the level conversion unit is used for adjusting the touch position from the plurality of signal processing circuits. The information is level shifted.

Optionally, the voltage signal on the level conversion unit is based on the ground signal, or the voltage signal of some circuits on the level conversion unit is based on the voltage signal on the second ground terminal, and the rest The voltage signal of the circuit is based on the voltage signal on the first ground terminal.

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; the driving chip further includes a data driving circuit, and the data driving circuit is used for driving The plurality of pixel electrodes perform image display refresh.

Optionally, the modulation circuit outputs the modulation signal to the first ground terminal, and the data driving circuit, the common voltage generating circuit, and the touch driving circuit cooperate together to drive the touch display panel Image display refresh and touch sensing are performed simultaneously.

Optionally, the touch display panel further includes:

multiple scan lines;

a plurality of data lines, which are insulated and cross-arranged with the plurality of scan lines; and

a plurality of control switches, each control switch includes a control electrode, a first transmission electrode, and a second transmission electrode, the control electrode is used for connecting the scan line, the first transmission electrode is used for connecting the data line, the second transfer electrode is used to connect the pixel electrode;

The driver chip further includes:

A scan signal generating circuit, connected to the plurality of scan lines through a scan drive circuit, used to generate a scan turn-on signal or a scan turn-off signal to the plurality of scan lines, and control the connection with the scan line that receives the scan turn-on signal The switch is turned on, and the control switch connected to the scan line that receives the scan-off signal is turned off;

The data driving circuit is configured to output corresponding gray-scale voltages to corresponding pixel electrodes through the plurality of data lines and the activated control switches;

Wherein, the signals on the data driving circuit and the scanning signal generating circuit are both based on the voltage signal on the first ground terminal.

Optionally, the drive chip includes the scan drive circuit, and the scan drive circuit is configured to activate each row control switch one by one.

Optionally, the control circuit is configured to be connected to the scan driving circuit and the data driving circuit respectively, to provide scan timing to the scan driving circuit and to provide display data to the data driving circuit.

Optionally, the driver chip further includes a display processing circuit, the display processing circuit is connected to the control circuit through the level conversion unit, and the display processing circuit is configured to receive display data from a main control chip, and perform storage, decompression and color adjustment on the display data, and output the adjusted display data to the level conversion unit; the level conversion unit performs level conversion on the received display signal, and outputs The level-converted display data is sent to the control circuit.

Optionally, the driver chip is a single chip.

The present invention also provides a touch display device, comprising a touch display panel and a driving chip, wherein the driving chip is used 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 utility model also provides an electronic device, including the above-mentioned touch display device.

Description of drawings

FIG. 1 is a schematic structural diagram of the electronic device of the application.

FIG. 2 is a schematic diagram of waveforms of some signals of the electronic device shown in FIG. 1 according to an embodiment.

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

FIG. 4 is a schematic diagram of a circuit structure of an embodiment of the modulation circuit shown in FIG. 3 .

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

FIG. 6 is a schematic diagram of an exploded structure of an embodiment of the touch display panel shown in FIG. 5 .

FIG. 7 is a schematic cross-sectional structure diagram of the touch display panel shown in FIG. 6 .

FIG. 8 is a schematic cross-sectional structure diagram of another embodiment of the touch display panel shown in FIG. 5 .

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

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

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

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

FIG. 13 is a schematic diagram of a circuit structure of an embodiment of the protection circuit shown in FIG. 12 .

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

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

Detailed ways

In order to make the above objects, features and advantages of the present utility model more clearly understood, the specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments conveyed to those skilled in the art. For convenience or clarity, 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 shown. In addition, the size of the elements does not fully reflect the actual size, and the number of related elements does not fully reflect the actual number. The numbers of the same or similar or related elements shown in different drawings may be inconsistent due to different sizes of the drawings and the like. The same reference numbers in the figures denote the same or similar structures. Of course, it should be noted that, in order to make the reference numerals have regularity and logic, in some different embodiments, the same or similar elements or structures use different reference numerals, according to technical relevance and related text descriptions , those skilled in the art can directly or indirectly judge and know.

Furthermore, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art should realize that the technical solutions of the present invention can also be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations have not been shown or described in detail to avoid obscuring the invention.

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

In the description of the present invention, it should be understood that: "multiple" includes two or more, "multiple" includes two or more, "multiple" includes two or more, " "Multi-line" includes two or more lines, and "multi-column" includes two or more columns, unless otherwise expressly and specifically defined in this application. In addition, words such as "first", "second", "third", and "fourth" appearing in the names of components and signals do not limit the order in which components or signals appear, but are for the convenience of component naming. Clear separation of elements makes the description more concise and understandable.

In order to avoid confusion in understanding, further pre-explainations are required:

For a general display device, the display device usually includes a display panel and a driving circuit. The driving circuit is used for driving the display panel to perform image display. The display panel generally includes a plurality of pixels, and each pixel includes a first electrode and a second electrode. The driving circuit provides the same voltage (for example, 0 volts) to the first electrode of each pixel, and provides different voltages to the second electrode of each pixel, thereby realizing image display of different gray scales.

When the display device is a liquid crystal display device, the first electrode is generally referred to as a common electrode, and the second electrode is generally referred to as a pixel electrode. The driving circuit drives the liquid crystal display panel to perform image display refresh by providing a common voltage to the first electrode and a gray-scale voltage to the second electrode. Alternatively, the display device may also be other suitable type of display device, 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 provides a gray-scale voltage to the second electrode and a common voltage to the first electrode, the pixel starts to perform image display refresh, and when the gray-scale voltage is written to the first electrode After the second electrode, the gray-scale voltage is stopped to be supplied to the second electrode, and the image display refresh is completed. After that, the pixel point enters an image display holding state until the pixel point receives a gray-scale voltage next time.

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

The two different display states of image display refresh and image display retention are described in advance in preparation for a better understanding of the various embodiments described below in this application.

As mentioned above, the names of the first electrode and the second electrode are different in different types of display devices. For each suitable type of display device applicable to this application, the first electrode is collectively called the common electrode, and the second electrode is collectively called the second electrode. The electrodes are pixel electrodes. Correspondingly, the display voltage signal provided to the common electrode by the following driver chip of the present application is a common voltage, and the display voltage signal provided to the pixel electrode is a gray-scale voltage.

The touch screen generally includes several types of touch screens, such as resistive type, capacitive type, and infrared type. Among them, capacitive touch screens are more widely used. Capacitive touch screens include mutual capacitive touch screens and self-capacitive touch screens.

In mutual capacitance based touch systems, a touch screen may include, for example, drive and sense regions, such as drive and sense lines. In an example case, the drive lines may form multiple rows and the sense lines may form multiple columns (eg, orthogonal). Touch pixels can be placed at the intersection of rows and columns. During operation, the row can be excited with an alternating current signal (AC) waveform, and mutual capacitance can be formed between the row and column of the touch pixel. When a target object approaches the touch pixel, some of the charge coupled between the row and column of the touch pixel may instead be coupled to the object. This reduction in charge coupled on the touch pixel can result in a net reduction in mutual capacitance between rows and columns and a reduction in AC waveform coupled on the touch pixel. This reduction in the charge coupled AC waveform can be detected and measured by the touch system to determine the position of the target object when touching the touch screen.

In contrast, in a self-capacitance-based touch system, each touch pixel may be formed from 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 capacitance to ground can result in a net increase in the self capacitance experienced by the touch pixel. This increase in self-capacitance can be detected and measured by the touch system to determine the position of the target object when touching the touch screen.

Below, each Example of this application is demonstrated.

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic structural diagram of an embodiment of an electronic device of the present application. FIG. 2 is a schematic diagram of waveforms of some signals of the electronic device shown in FIG. 1 according to an embodiment. For example, the electronic device 100 is various suitable types of products such as portable electronic products, smart home electronic products, and vehicle-mounted electronic products, which are not limited in the present invention. The portable electronic product is, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, and the like. The smart home electronic products are, for example, desktop computers, refrigerators, washing machines, televisions, and the like. The in-vehicle electronic products are, for example, a navigator, an in-vehicle DVD, and the like. The electronic device 100 includes a touch display device 1 . The touch display device 1 is used for image display and touch sensing. The touch display device 1 is, for example, but not limited to, an In-Cell (in-a-box or in-cell) type of touch display device. The touch display device 1 is, for example, a liquid crystal display device. Of course, alternatively, 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 used for driving the touch display panel 10 to perform image display and touch sensing.

In one embodiment, the touch display panel 10 includes a plurality of common electrodes 101 . The plurality of common electrodes 101 are used 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 touch driving signals 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 used to drive the plurality of common electrodes 101 to perform self-capacitance touch sensing.

The plurality of common electrodes 101 are, for example, arranged in a two-dimensional array. Specifically, the plurality of common electrodes 101 are arranged in multiple rows and columns along the X direction and the Y direction, wherein the X direction is the row direction, so the The Y direction is referred to as the column direction. Of course, alternatively, in other embodiments, the plurality of common electrodes 101 may also be arranged in other regular or irregular manners, which are not limited in this application. The shape of each common electrode 101 is, for example, but not limited to, a rectangle.

The driving chip 20 is used to generate a modulation signal MGND, and by using the modulation signal MGND to synchronously modulate all the voltage signals output by the driving chip 20 to the touch display panel 10, the touch display panel 10 can be driven at the same time. 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 increased, the touch sensing time will not be shortened, thereby breaking the technical bottleneck of insufficient touch sensing time caused by the increased display resolution. Accordingly, the user experience of the electronic device 100 is better.

In particular, the driving chip 20 can further drive the common electrode 101 to perform self-capacitance touch sensing while driving the touch display panel 10 to perform image display refresh. Therefore, the touch sensing of the touch display device 1 is not limited to be performed during the line gap I (see FIG. 2 ) and the frame gap of image display.

In this embodiment, the modulation signal MGND is a periodically changing square wave signal. Of course, alternatively, in other embodiments, the modulation signal MGND may also be other suitable waveforms, such as a sine wave signal, a staircase wave signal, and the like. Further, the modulation signal MGND may also be a non-periodically changing signal.

When the driving chip 20 drives the touch display panel 10 to perform image display and touch sensing at the same time, the elements on the touch display panel 10 are either directly driven by the driving chip 20 or indirectly driven by the driving chip 20 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 the signal output from the driving chip 20; When it is not directly driven by the driving chip 20 , it is indirectly driven by the driving chip 20 through capacitive coupling, for example. Between elements, correspondingly, the signals of the elements superimpose the modulation signal MGND due to capacitive coupling. Therefore, all voltage signals on the touch display panel 10 are modulated by the modulation signal MGND. In addition to capacitive coupling, the elements in the touch display panel 10 can also be indirectly driven by the driving chip 20 through elements such as resistors.

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

In this way, the driving chip 20 can simultaneously or approximately synchronously modulate all the voltage signals of the touch display panel 10, so that the common electrodes 101 can be simultaneously driven during any process of driving the touch display panel 10 to perform normal image display. Perform touch sensing. Further, due to being modulated by the modulation signal MGND, the touch driving signal can be raised, therefore, the touch sensing signal output by the common electrode 101 to the driving chip 20 can be raised accordingly, so that the The signal-to-noise ratio of the touch sensing of the touch display device 1 is improved, 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-sharing manner. For example, the driving chip 20 drives part of the common electrodes 101 to perform touch sensing each time, and completes the touch sensing for all the common electrodes 101 through multiple driving.

In some specific embodiments, the driving chip 20 can drive the common electrodes 101 row by row to perform image display and touch sensing, or can simultaneously drive multiple rows of common electrodes 101 to perform image display and touch sensing.

Since the driving chip 20 drives the common electrodes 101 to perform self-capacitance touch sensing in a time-division (eg, row-by-row or row-by-row), the output pins of the driving chip 20 drive all the common electrodes 101 at the same time. 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 the purpose of cost saving.

Of course, alternatively, in other embodiments, the driving chip 20 can also drive all the common electrodes 101 to perform touch sensing at the same time. Alternatively, the driving chip 20 may also perform touch sensing on the plurality of common electrodes 101 by a combination of time-division driving and simultaneous driving.

In different embodiments, the driving chip 20 can drive one row of common electrodes 101 to perform touch sensing, can also drive multiple rows of common electrodes 101 to perform touch sensing, and can drive all common electrodes 101 to perform touch simultaneously. detect. In addition, the driving chip 20 may not drive the common electrodes 101 to perform touch sensing by rows, for example, drive the common electrodes 101 to perform touch sensing by columns or drive the common electrodes 101 to perform touch sensing by an irregular driving manner, etc. 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, for example, the driving chip 20 provides touch driving signals to some common electrodes 101 each time to perform image display and touch sensing, and the driving chip 20 correspondingly provides common voltages to the remaining common electrodes 101 to perform image display and touch sensing. Image display. Wherein, the touch driving signal is the same as the common voltage, and both are signals modulated by the modulation signal MGND.

Further, the driving chip 20 also receives the touch sensing signal output from the common electrode 101 to obtain the 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 and other suitable objects.

Since the touch driving signal is the same as the common voltage, the common electrode 101 supplied with the touch driving signal can perform normal image display while performing touch sensing. Correspondingly, 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 refresh, the common electrode 101 can be further driven to perform self-capacitance touch sensing.

Optionally, the driving chip 20 is configured to intermittently drive the touch display panel 10 to perform touch sensing. For example, in one embodiment, the driver chip 20 drives the touch display panel 10 to perform touch sensing and image display for a first predetermined time, and then drives the touch display panel 10 to perform image display. Stop performing touch sensing for a second predetermined period of time, and so on and so forth, the touch display device 1 realizes image display and touch sensing.

When the driver chip 20 drives the touch display panel 10 to perform touch sensing and image display at the same time, all voltage signals on the touch display panel 10 or all voltage signals output by the driver chip 20 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 above are based on 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 0V (volts), but is not limited to a constant voltage signal of 0V, and can also be a constant voltage signal close to 0V, The ground signal GND is generally a voltage signal on the device ground of the electronic device 100 . The device ground, also called the system ground, is, for example, the negative pole of the power supply of the electronic device 100 , such as a battery. The ground signal GND is also called system ground voltage, system ground signal, equipment ground voltage, or equipment ground signal. Typically, the device ground is not the earth ground or absolute ground. Of course, when the electronic device 100 is connected to the earth ground through a conductor, the device ground may also be the earth ground.

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

Alternatively, in other implementation manners, the driving chip 20 may, for example, always drive the touch display panel 10 and perform image display and touch sensing at the same time. 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.

It can be seen from the above that the touch driving signal is used as a common voltage at the same time. In order to distinguish the common voltages provided by the driving chip 20 to the plurality of common electrodes 101 are different when the touch display device 1 performs touch sensing and does not perform touch sensing, it is defined that the touch display device 1 performs touch sensing. When measuring, the common voltage provided by the driving chip 20 to the plurality of common electrodes 101 is the first common voltage Vcl, which defines that when the touch display device 1 performs image display instead of simultaneously performing touch sensing, the driving The common voltage provided by 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 relative to the ground signal GND.

The second common voltage Vc2 remains unchanged compared to the ground signal GND. Of course, alternatively, the second common voltage Vc2 can also be a variable signal compared to the ground signal GND, such as 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 lower than the frequency of the first common voltage Vc1.

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

It can be seen from the above content that when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing, the first common voltage Vc1 provided by the driving chip 20 to the plurality of common electrodes 101 at the same time is not Both are used as touch drive signals at the same time. However, when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing simultaneously, the first common voltage Vc1 supplied to the plurality of common electrodes 101 is simultaneously used as a touch driving signal.

In particular, when the driving chip 20 drives the plurality of common electrodes 101 to perform touch sensing, although the driving chip 20 simultaneously provides the same first common voltage Vc1 to the plurality of common electrodes 101, the The circuit structure of the driving chip 20 for driving the common electrodes 101 to simultaneously perform image display and touch sensing is different from the circuit structure for driving the common electrodes 101 to perform only image display. In this regard, this application will be described in detail below.

Since all voltage signals on the touch display panel 10 are synchronously modulated by the modulation signal MGND, the modulated display driving signals in all the voltage signals can drive the touch display panel 10 to perform normal images display, and the modulated display driving signal, eg, the first common voltage Vc1, can be further adapted to drive the common electrode 101 to perform self-capacitance touch sensing. Correspondingly, in any process of driving the touch display panel 10 to perform image display, the driver chip 20 can simultaneously drive the touch display panel 10 to perform touch sensing, and the touch sensing will not affect normal image display. Further, even when the display resolution of the touch display device 1 is increased, the touch sensing time will not be shortened, thereby improving the user experience of the electronic device 100 .

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

It should be noted that, for the pixel 11 that performs image display refresh and the pixel 11 that performs image display retention, the signal on the pixel electrode 103 of the pixel 11 that performs image display refresh is the modulation provided by the driver chip 20. After the signal, the signal on the pixel electrode 103 of the pixel point 11 that performs image display retention is superimposed on the modulation signal MGND due to capacitive coupling.

The touch display device 1 is, for example, various types of display devices such as a high-definition (HD) display device, a full high-definition (FHD) display device, an ultra-high-definition (UHD) display device, etc. 3840x2160, of course, the display resolution is not limited to this, for example, when the display resolution is 2K, 2K can be 1920x1080, of course, it can also be 2560X1440 and other suitable situations. Similarly, when the display resolution is 4K, 8K, various cases can also be included. For the touch display device 1 of the present application, in any process of image display, touch sensing can be further performed, and the touch sensing does not affect normal image display.

Since the voltage signal on the touch display panel 10 is synchronously modulated by the modulation signal MGND, and the modulated first common voltage Vc1 can be used as a display driving signal and a touch driving signal at the same time, the touch display device 1 Image display refresh and self-capacitance touch sensing can be performed simultaneously, and there is no or little 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 refresh under the driving of the driving chip 20, for example, the line gap I (as shown in FIG. 2) and the frame gap, the driving chip 20 also The common electrodes 101 can be driven to perform self-capacitance touch sensing together. At this time, the touch display panel 10 is in a state where the image display is maintained as a whole. Since the modulation signal MGND is used to synchronously modulate the signal output by the driver chip 20 to the touch display panel 10, the touch sensing will not change. The display voltage difference between the two electrodes 101 and 103 of the pixel point 11 (see FIG. 5 ), correspondingly, the quality of image display and touch sensing of the touch display panel 10 is better.

Since the driver chip 20 can drive the common electrodes 101 to perform touch sensing in any process of driving the touch display panel 10 to perform image display, the manufacturer can set the driver chip 20 to drive the common electrode 101 as required. A period during which the electrode 101 performs touch sensing. Specifically, for example, touch sensing is performed during the entire process or part of the image display process. More specifically, for example, touch sensing is performed during image display refresh and/or during line gap I, frame gap, and the like.

In this embodiment, the driving chip 20 simultaneously drives the plurality of common electrodes 101 to perform image display, and drives the plurality of common electrodes 101 to perform self-capacitance touch sensing in a time-division manner.

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 by time division. Of course, for some of the common electrodes 101 in the plurality of common electrodes 101 , the driving chip 20 may simultaneously drive some of the common electrodes 101 to perform touch sensing. 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 completes one touch sensing for all the common electrodes 101 through multiple driving.

In this application, only one touch sensing of the plurality of common electrodes 101 is completed by the driving chip 20 through multiple driving operations, that is, the driving chip 20 is defined as driving the plurality of common electrodes 101 in a time-sharing manner. touch sensing.

For the driving chip 20 to drive the plurality of common electrodes 101 to perform self-capacitance touch sensing in a time-sharing manner, in some embodiments, for example, the driving chip 20 may drive the common electrodes 101 to perform self-capacitance touch sensing by row. Measurement. When the driving chip 20 provides the first common voltage Vc1 to the common electrodes 101 of one row to perform self-capacitance touch sensing and image display, it also provides the first common voltage Vc1 to the common electrodes 101 of the remaining rows to perform image display. After the driving chip 20 drives one row of common electrodes 101 to perform self-capacitance touch sensing, next, drives another row of common electrodes 101 to perform self-capacitance touch sensing and image display, and drives the remaining rows of common electrodes 101 to perform image display . In this way, one touch sensing driving for all the common electrodes 101 is completed through multiple driving.

It should be noted that, the driving chip 20 sequentially drives the common electrodes 101 to perform touch sensing, which may partially overlap or not overlap.

In particular, for the manner in which the driving chip 20 intermittently drives the touch display panel 10 to perform self-capacitance touch sensing, a period during which the common electrodes 101 perform touch sensing is defined as the first period W1, and the multiple common electrodes 101 are defined as the first period W1. The period in which the electrodes 101 all perform image display without 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 period W1 and the second period W2 are alternately performed.

In the first period W1, the driving chip 20 generates the modulation signal MGND, and uses the modulation signal MGND to synchronously modulate the input signal of the touch display panel 10 . Correspondingly, the driving chip 20 simultaneously outputs the first common voltage Vcl to the plurality of common electrodes 101 to perform image display, and receives the touch sensing signals output from the plurality of common electrodes 101 in a time-sharing manner to obtain Touch Info.

In order to distinguish clearly from the signals of the second period W2 described below, it is defined that the voltage signals output by the driving chip 20 to the touch display panel 10 in the first period W1 are the first signals, and the driving chip 20 is defined as the first signal. The voltage signals output to the touch display panel 10 in the second period W2 are all second signals. Correspondingly, the first signal includes the first common voltage Vc1.

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

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

The second signal includes the second common voltage Vc2. During the second period W2, the driving chip 20 outputs the 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 modulated by the second common voltage Vc2 by the modulation signal MGND. For a 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 can also be a voltage signal of other magnitudes.

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 0.2V signal.

However, the present invention is not limited to this, and the modulation signal MGND, the second common voltage Vc2 and other signals can also be other suitable types of signals.

In the second period W2, the driving chip 20 does not use the modulation signal MGND to synchronously modulate the input signal of the touch display panel 10. For example, the driving chip 20 still uses the existing display driving method to The touch display panel 10 is driven. Therefore, the touch display device 1 reduces power consumption during the second period W2 compared to the technical solution that adopts modulation during the first period W1.

As can be seen from the above, the driving chip 20 adopts the mode of intermittently driving the plurality of common electrodes 101 to perform touch sensing, and the touch display device 1 can not only perform self-capacitance touch sensing in any process of performing image display, but also The problem of large power consumption caused by the modulation scheme can be avoided as much as possible.

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

It should be noted that the setting of the duration of the second period W2 needs to have no influence on the overall detection of the touch operation by the touch display device 1 , and on the contrary, the power consumption can be reduced to a certain extent.

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. Of course, the durations of the first time periods W1 may not be exactly the same or different from each other, and the durations of the second time periods W2 may not be exactly the same or different from each other. In addition, the first period W1 and the second period W2 may also be different for different types of touch display devices 1 , for touch display devices 1 with different sizes, and for touch display devices 1 with different materials. Further, for the touch display device 1 to work in different states, for example, a black screen standby state and a bright screen image display state, the duration settings of the first time period W1 and the second time period W2 can also be different to reduce power consumption. .

The following mainly describes the touch display device 1 and its working principle in the manner of driving the plurality of common electrodes 101 to perform touch sensing intermittently and time-sharing by the driving chip 20 .

Please refer to FIG. 3 , which is a schematic diagram of a circuit structure of an embodiment 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 selection 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 selection circuit 24 . The data selection circuit 24 is connected to the plurality of common electrodes 101 . The control circuit 25 is connected to the data selection circuit 24 . The common voltage generating circuit 22 and the touch driving circuit 23 can be selectively connected to the corresponding common electrodes 101 through the data selection circuit 24 .

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

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

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 obtain touch position information.

Under the control of the control circuit 25 , the data selection circuit 24 correspondingly selects and outputs the signals generated by the common voltage generating circuit 22 to the corresponding common electrodes 101 to perform image display, and selects and outputs the signals generated by the touch driving circuit 23 . The generated signals perform image display and self-capacitance touch sensing to the corresponding common electrodes 101 .

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

The modulation circuit 21 is used to generate the modulation signal MGND. The modulation signal MGND includes a first reference signal and a second reference signal. The voltage conditions of the first reference signal and the second reference signal may be any one of the following five conditions:

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 with different magnitudes;

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

Taking the ground signal GND as a reference, the first reference signal and the second reference signal are both constant voltage signals. The modulation signal MGND is a periodically changing 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. Of course, the grounding signal is 0V and the driving signal is 0.2V is just an example, the manufacturer can adjust the amplitude of the modulation signal MGND according to the situation of the product, which is not limited in this application.

In addition, taking the first reference signal as a low-level signal and the second reference signal as a high-level signal as an example, preferably, the duration of the first reference signal of the modulation signal MGND is equal to the duration of the second reference signal. 2 times the duration. Or, alternatively, the duration of the first reference signal of the modulation signal MGND is 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. The second half of the signal and the period in which the second reference signal exists are respectively sampled for the touch sensing 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, for example, performs a reset operation during the existence of the first reference signal, and during the existence of the second reference signal The sampling of the touch sensing signal is performed respectively.

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

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

In this embodiment, the driving chip 20 achieves synchronous modulation of all voltage signals on the touch display panel 10 by providing the modulation signal MGND to a part of the driving chip 20 , 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 this part of the ground is the modulation signal MGND, all the voltage signals of the touch display panel 10 are synchronously changed into signals modulated by the modulation signal MGND.

As can be seen from the above content, when the driving chip 20 drives the touch display panel 10 to perform image display and touch sensing at the same time, the driving chip 20 includes two parts, one of which is used to load the modulation signal MGND , which is partly used to load the ground signal GND.

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

In contrast, in the second time period W2, the electronic device 100 uses one domain as the voltage reference, and both uses the ground signal GND as the voltage reference. The grounds of the circuits in the electronic device 100 are all connected to the device ground and receive 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 pre-explained that, in this embodiment, in the first period W1, the common voltage generating circuit 22, the touch driving circuit 23, the signal processing circuit 26, the data selection circuit 24, and the control circuit 25 are located in the domain 90 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 field 80 .

The modulation circuit 21 includes a modulation terminal M. The modulation circuit 21 outputs the modulation signal MGND to the ground terminals of the circuits in the domain 90 through the modulation terminal M, so that the output of the circuits in the domain 90 with the modulation signal MGND as the voltage reference standard is modulated by the modulation signal MGND. The voltage signal modulated by the signal MGND is sent to the touch display panel 10 . Wherein, the modulation terminal M is connected to the modulation ground, or serves as one end of the modulation ground. In addition, the signal on the touch display panel 10 in a floating state (eg, the pixel electrode 103 that performs image display retention described later, see FIG. 5 ) superimposes the modulation signal MGND due to capacitive coupling. Therefore, in the first period W1, all the voltage electrical signals on the touch display panel 10 become signals modulated by the modulation signal MGND.

The circuits in the domain 90, for example, the common voltage generation circuit 22, the touch drive circuit 23, the signal processing circuit 26, the data selection circuit 24, and the control circuit 25, if they include a ground terminal, the ground terminal can be directly connected to the modulation ground .

In the second period W2, the electronic device 100 as a whole uses the ground signal GND as a voltage reference.

Correspondingly, in the first period W1, the modulation circuit 21 generates the modulation signal MGND according to the ground signal GND on the device ground and the driving signal from the voltage generating circuit 27, and provides the modulation signal MGND to the modulated. The common voltage generating circuit 22 generates the first common voltage Vc1 correspondingly, and provides it to the corresponding common electrode 101 through the data selection circuit 24 to perform image display. The touch driving circuit 23 generates the first common voltage Vc1 correspondingly, and provides it to the corresponding common electrode 101 through the data selection circuit 24 to perform image display and self-capacitance touch sensing. The signal processing circuit 26 receives the touch sensing signal output from the touch driving circuit 23 to obtain touch information. That is, the first common voltage Vc1 output by the touch driving circuit 23 to the common electrode 101 is used as both a display driving signal and a touch driving signal, and the first common voltage Vc1 output by the common voltage generating circuit 22 to the common electrode 101 is only used for as a display drive signal.

The first common voltage Vc1 output 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 obtain touch information. Therefore, the driving chip 20 can drive the touch display panel 10 to perform image display and self-capacitance touch sensing simultaneously.

Since the first common voltage Vc1 provided by the touch driving circuit 23 to the common electrodes 101 is used as both a touch driving signal and a display driving signal, the common voltage generating circuit 22 drives part of the common electrodes 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 simultaneously perform touch sensing in any process of performing image display, and there is no interference between touch sensing and image display or less interference on image display.

In addition, since the modulation circuit 21, the touch driving circuit 23 and other circuits are integrated in a single driving chip 20, and a single chip saves space compared with multiple chips, the touch display device 1 occupies the The space of the electronic device 100 is small. In addition, compared with multiple chips, a single chip is more conducive to the assembly and production management of the touch display device 1 , 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 to the plurality of common electrodes 101 through the data selection circuit 24 to perform image display.

Preferably, in the second period W2 , the data selection circuit 24 is controlled by the control circuit 25 , and the second common voltage Vc2 on the plurality of common electrodes 101 comes from the common voltage generating circuit 22 . For example, the touch driving circuit 23 can further output the second common voltage Vc2 to the data selection circuit 24, but the data selection circuit 24 selects and outputs the second common voltage Vc2 from the common voltage generating circuit 22 to the plurality of common electrodes 101 , thereby causing the touch display device 1 to perform image display during the second period W2 and stop performing touch sensing.

The touch display device 1 realizes image display and touch sensing by alternating between the first period W1 and the second period W2.

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

The circuit structure of the touch driving circuit 23 is different from that of the common voltage generating circuit 22 . The touch driving circuit 23 can further receive the touch sensing signal output from the common electrode 101 . The signal processing circuit 26 acquires touch position information according to the touch sensing signal.

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

On the contrary, the common voltage generating circuit 22 does not receive the signal from the common electrode 101 .

Preferably, the common voltage generating circuit 22 and the touch driving circuit 23 share the same signal source 221 , and the signal source 221 is modulated by the modulation signal MGND to correspondingly generate a first reference voltage signal. The common voltage generating circuit 22 and the touch driving circuit 23 respectively output a first common voltage Vc1 which is the same as the first reference voltage signal to the plurality of common electrodes 101 , wherein the common voltage generating circuit 22 is in phase with each other. The connected common electrodes 101 only perform image display, and the common electrodes 101 electrically connected to the touch driving circuit 23 perform image display and self-capacitance touch sensing simultaneously.

Since the touch driving circuit 23 provides the same signal as the common voltage generating circuit 22 to the common electrode 101 , the touch driving circuit 23 drives the common electrode 101 to perform self-capacitance touch sensing without affecting the execution of self-capacitance touch sensing. The common electrode 101 of self-capacitance touch sensing 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 signals output by the common voltage generating circuit 22 and the touch driving circuit 23 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 regulator circuit 223 . The signal source 221 is connected to the follower 222 , and the follower 222 is further connected to the data selection circuit 24 . One end of the voltage regulator 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, which is not limited in the present invention, and the signal source 221 can also be other suitable circuit structures.

The follower 222 transmits the signal output from the signal source 221 to the data selection circuit 24 , and provides the 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 to this, and the follower 222 can also be other suitable circuit structures, and is not limited to the first amplifier. In the specific implementation manner, the follower 222 is taken as an example of the first amplifier for description. The first amplifier 222 includes a third power terminal c1, a third ground terminal d1, a first non-inverting terminal e1, a first inverting terminal f1, and a first output terminal g1. Wherein, the third power supply terminal c1 is used for loading the power supply voltage VDD1. The third ground terminal d1 is used to connect the modulation ground. The first non-inverting terminal e1 is used for connecting with the output terminal b of the signal source 221 . The first inverting terminal f1 is short-circuited with the first output terminal g1. The first output terminal g1 is connected to the data selection circuit 24 .

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

During operation, in the first period W1, both the ground terminal a and the third ground terminal d1 receive the modulation signal MGND, and the signal source 221 outputs the first reference voltage signal to the output terminal b correspondingly. If the first amplifier 222 is in a virtual short state, the first common voltage Vc1 that is the same as the first reference voltage signal is correspondingly output to the data selection circuit 24, and the data selection circuit 24 The corresponding common electrodes 101 are supplied to perform image display.

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

The touch driving circuit 23 includes, for example, the signal source 221 and a plurality of operational amplifiers 231 . Each operational amplifier 231 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 non-inverting terminal e2, a second inverting terminal f2, and a second output terminal g2. Wherein, the fourth power supply terminal c2 is used for loading the power supply voltage VDD2. The fourth ground terminal d2 is used to connect the modulation ground. The second non-inverting terminal e2 is used for connecting with the output terminal b of the signal source 221 . The second inversion 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.

During 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 the first reference voltage signal from the signal source 221 , and outputs the first common voltage Vc1 to the data selection circuit 24 correspondingly, through the data selection circuit 24 supplied to the corresponding common electrodes 101 . The feedback branch 233 is used for transmitting the touch sensing signal sensed by the common electrode 101 to the signal processing circuit 26 .

The number of the plurality of operational amplifiers 231 is, for example, the same as the number of columns of the plurality of common electrodes 101 . Each operational amplifier 231 can be selectively connected to a column of common electrodes 101 through the data selection circuit 24 . Of course, the number of the plurality of operational amplifiers 231 may also be the same as the number of rows of the plurality of common electrodes 101 . In addition, the present invention is not limited to this. For example, the common electrodes 101 of each column can also be selected to be connected to two operational amplifiers 231 and other implementations.

The touch driving circuit 23 of the present invention provides the common electrode 101 with a touch driving signal that is the same 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-capacitance 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, compared to the touch driving circuit 23 and the common voltage generating circuit 22 each using a signal source, the touch driving circuit 23 and the common voltage generating circuit 22 of the present application share the same signal source 221 . , therefore, the first common voltage Vc1 output by the touch driving circuit 23 and the common voltage generating circuit 22 to the plurality of common electrodes 101 through the data selection circuit 24 can be more likely to be the same or can reach the same, thereby ensuring that The quality of image display and touch sensing of the touch display device 1 .

In the second period W2, the modulation ground becomes the device ground, the signal source 221 outputs 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 selects and outputs the 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 embodiments, a first switch (not shown in the figure) may also be set between the signal source 221 and the follower 222, and a second switch (not shown in the figure) may be set between the signal source 221 and the operational amplifier 231 ), correspondingly, in the first time period W1, the first switch and the second switch are both in the closed state, and in the second time period W2, the first switch is in the closed state, and the second switch is in the 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 respectively connected to the plurality of common electrodes 101 . Each operational amplifier 231 is respectively connected to a second data selector 242 , and each second data selector 242 is respectively connected to a column of common electrodes 101 . The first data selector 241 and the plurality of second data selectors 242 are connected to the control circuit 25, respectively. The control circuit 25 controls the signal output timing 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 with 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 the 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 a signal from the touch driving circuit 23 to the corresponding common electrode 101 . The number of the second output ports O2 is the same as the number of rows of the plurality of common electrodes 101 , that is, 26. It should be noted that, in FIG. 2 , limited to the size of the illustration, only part of the circuit structure is actually shown, for example, only two operational amplifiers 231 , two second data selectors 242 , and part of the common electrode 101 are shown. .

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

Of course, alternatively, in other implementation manners, the number of the first data selectors 241 may also be multiple, and is not limited to one. Correspondingly, the first data selectors 241 of the multiple first data selectors The connection relationship between the output port O1 and the second output ports O2 of the plurality of second data selectors 242 can be adjusted accordingly, for example, each first data selector 241 is connected to a part of the second data selectors 242, Of course, it is also possible that the first output port O1 of each first data selector 241 is connected to some of the second output ports O2 of the plurality of second data selectors 242, and so on.

In the first period W1, the plurality of second data selectors 242 are 26-to-1 data selectors under the control of the control circuit 25, and accordingly, each second data selector 242 outputs the output from the touch driving circuit each time The first common voltage Vc1 of 23 is applied to a common electrode 101, and through 26 times, the plurality of second data selectors 242 drive all the common electrodes 101 to perform one touch sensing. The first data selector 241 is a 26-to-25 data selector under the control of the control circuit 25. When the plurality of second data selectors 242 output the first common voltage Vc1 to the common electrodes 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 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-to-26 data selector under the control of the control circuit 25, and outputs the second common voltage Vc2 from the common voltage generating circuit 22 to all common electrodes 101. For example, the second data selector 242 stops outputting signals to the common electrode 101 under the control of the control circuit 25 .

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

Through the data selection circuit 24 , on the one hand, the number of connecting lines L between the driving chip 20 and the plurality of common electrodes 101 can be reduced, and on the other hand, it can achieve the advantage of driving the plurality of common electrodes 101 to perform image display. Meanwhile, the common electrode 101 is driven in time division to perform touch sensing.

Alternatively, in some embodiments, the touch display device 1 may also perform image display and touch sensing continuously. For example, in time, the common voltage generating circuit 22 and the touch driving The circuits 23 continue to provide the first common voltage Vc1 to the common electrodes 101 . In space, the common voltage generating circuit 22 cooperates with the touch driving circuit 23 to drive the plurality of common electrodes 101 . In other words, without the second period W2, the control circuit 25 correspondingly controls the first data selector 241 to always keep 26-to-25, and controls the plurality of second data selectors 242 to always keep 26-to-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 101 can be adjusted accordingly. For those skilled in the art, according to the technical content disclosed above, it is possible to reasonably infer the corresponding circuit information, so it is not repeated here.

In addition, in some embodiments, the driver chip 20 may further include, for example, a fingerprint driver circuit, and the fingerprint driver circuit can selectively connect the plurality of common electrodes 101. When the driver chip 20 is driving a portion of the common electrodes 101 When performing touch sensing and image display at the same time, the fingerprint driving circuit can also drive part of the common electrodes 101 to perform fingerprint sensing and image display at the same time, and the common voltage generating circuit 22 drives part of the common electrodes to perform image display. Therefore, in this application, driving the common electrode 101 to work is not limited to the common voltage generating circuit 22 and the touch driving circuit 23, but may also include circuits of other suitable types or functions, corresponding to driving the common electrode 101 to perform corresponding functions.

Please refer to FIG. 3 and FIG. 4 together. FIG. 4 is a schematic diagram of a 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, and the second active switch 213 includes a control terminal K2, a first transmission terminal T3, and a second transmission terminal T4. The control terminals K1 and K2 are both connected to the control unit 215 . The second transmission terminal T2 of the first active switch 211 is connected to the first transmission terminal T3 of the second active switch 213, and an output node N is defined on the connection line. The first transmission terminal T1 of the first active switch 211 The first reference signal is received, the second transmission terminal 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 and 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 terminal T4 is connected to the voltage generating circuit 27 , the first transmission terminal T1 is connected to the device ground for receiving the ground signal GND, and the node N is used for outputting the modulation signal MGND To the modulation ground.

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

The working principle of the modulation circuit 21 is: in the first period W1, the control unit 215 is used 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 the modulation ground. ; In the second period W2, the control unit 215 is used to control the modulation circuit 21 to output the ground signal GND to the modulation ground, and at this time the modulation ground becomes the same as the device ground.

It should be further explained that, in the first period W1, the electronic device 100 has a reference field 80 based on the ground signal GND and a reference field 90 based on the modulation signal MGND. For the touch display device 1, due to all the The touch driving circuit 23 provides touch driving signals to the common electrodes 101 and further receives the touch sensing signals output from the common electrodes 101 to obtain touch information. Therefore, the touch driving circuit 23 is driving the touch The principle when the display panel 10 performs touch sensing is the principle of self-capacitance touch sensing.

Please refer to FIG. 2 , FIG. 3 , and FIG. 5 together. FIG. 5 is a schematic diagram of a circuit structure of an embodiment of the electronic device 100 . As mentioned above, in this embodiment, the touch display device 1 is described by taking a liquid crystal display device as an example. Of course, alternatively, when the touch display device 1 is another type of display device, the circuit structure of the touch display device 1 can correspond to all different ones. In addition, the circuit structure of different liquid crystal display devices can also be different. However, the structures that can be easily deduced by those skilled in the art should fall within the protection scope of the present application. In this embodiment, the touch display panel 10 of the touch display device 1 includes a plurality of pixels 11 . Each pixel 11 is used for image display and touch sensing under the driving of the driving chip 20 . Each pixel 11 includes the common electrode 101 , the pixel electrode 103 , and the 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 electrodes G and the first transfer electrodes S are connected to the driving chip 20 . The second transfer electrode D is connected to the pixel electrode 103 . The driving chip 20 is used for driving the control switch 105 to be turned on and off.

The control switch 105 is, for example, a thin film transistor switch. 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, and the like. However, the present invention is not limited to this, 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 the gate electrode of the thin film transistor switch, the first transfer electrode S is the source electrode of the thin film transistor switch, and the second transfer electrode D is the thin film transistor switch Drain of the switch.

In this 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 that of the pixel electrode 103 , accordingly, several pixel points 11 can share the same common electrode 101 . Of course, in other modified implementations, each pixel 11 may also include a common electrode 101 respectively. In addition, for other types of display devices such as OLED, each pixel 11 may include a plurality of switches, capacitors and other elements.

During the first period W1, the driving chip 20 drives the control switch 105 to be turned on by providing the first scan turn-on signal Vg1 to the control switch 105, and provides the first gray-scale voltage Vd1 to the pixels through the turned-on control switch 105 The electrode 103 provides the first common voltage Vc1 to the common electrode 101 to drive the pixels 11 to perform image display refresh. Wherein, the first scan turn-on signal Vg1, the first gray-scale voltage Vd1, and the first common voltage Vc1 are all synchronously modulated by the modulation signal MGND.

Generally, the driving chip 20 drives the plurality of pixels 11 in rows to perform image display refresh. In the first period W1, when the driving chip 20 drives the pixels 11 of a certain row to perform image display refresh, the driving chip 20 provides the first scan-off signal Vg2 to the control switches 105 of the pixels 11 of the remaining rows, The control switches 105 of the pixel points 11 of the remaining rows are turned off, so that the pixel points 11 of the remaining rows are in the image display holding state. The first scan-off signal Vg2 is a signal modulated by the modulation signal MGND.

Generally, the plurality of pixel points 11 are arranged in multiple rows and multiple columns. Of course, the plurality of pixel points 11 can also be arranged in other regular or irregular ways.

In order to avoid the interference of touch sensing on image display refresh, preferably, the driving chip 20 simultaneously drives the pixels 11 for performing touch sensing and the pixels 11 for performing image display refresh without overlapping. The pixel points 11 for display refresh and the common electrodes 101 for performing touch sensing are spaced by a predetermined row and perform image display hold for pixel points 11 . Through software or hardware or software-hardware control, a predetermined distance can be maintained between the pixel points 11 for performing touch sensing and the pixel points 11 for performing image display refresh without overlapping.

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

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

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

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

The touch display panel 10 may further include a plurality of scan lines 281 and a plurality of data lines 291 . The plurality of scan lines 281 and the plurality of data lines 291 are, for example, arranged in an insulated crossover. The plurality of scan lines 281 extend in the X direction, for example, and are arranged in the Y direction. The plurality of data lines 291 extend in the Y direction, for example, and are arranged in the X direction. Each scan line 281 is respectively connected to the control electrodes G of the control switches 105 of the pixel points 11 in one row. Each of the data lines 291 is respectively connected to the first transfer electrodes S of the control switches of the pixel dots 11 in one column.

The plurality of scan lines 281 are used to transmit the first scan-on signal Vg1, the second scan-on signal Vg3, the first scan-off signal Vg2, or the second scan-off 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 transmission electrode S of the control switch 105 .

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

In this embodiment, during 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 domain 90. The scan signal generation circuit 28a is modulated by the modulation signal MGND of the modulation circuit 21 and outputs the first scan on signal Vg1 and the first scan off signal Vg2 to the scan driving circuit 28, and the scan driving circuit 28 correspondingly outputs the first scan on signal Vg1 and the first scan off signal Vg2 to the corresponding scan lines 281 under the timing control of the control circuit 25 , and the data 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 provide the corresponding pixel electrodes 103 through the activated control switches 105 to perform image display refresh. The common voltage generating circuit 22 and the touch driving circuit 23 provide the first common voltage Vc1 to the plurality of common electrodes 101 through the data selection circuit 24 .

In addition, the signal on the pixel electrode 103 of the pixel point 11 where the image display is maintained becomes a signal modulated by the modulation signal MGND through capacitive coupling. Therefore, the signals on the pixel electrode 103 and the common electrode 101 of each pixel point 11 of the touch display panel 10 are both synchronously modulated by the modulation signal MGND. Therefore, in any process of driving the touch display panel 10 to perform normal image display, the driving chip 20 can simultaneously drive the common electrodes 101 to perform touch sensing.

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

Compared with the existing Incell type touch display device that multiplexes common electrodes to perform touch sensing, the touch display device 1 of the present application modulates the input signal of the touch display panel 10 synchronously by using the modulation signal MGND, so that the touch display device 1 can be used for 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 provides the first scan turn-on signal Vg1 to the scan line 281, it can also perform self-capacitance touch sensing on the common electrode 101. Correspondingly, the touch display device 1 is not limited to drive the common electrodes 101 to perform touch sensing in the line gap I and frame gap, so that there is no time to perform touch sensing for display devices with improved display resolution. Not enough technical issues. In addition, the touch display device 1 performs touch sensing in any process of displaying an image, which has no or little impact on the normal display of the image.

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

In addition, in the second period W2, the scan signal generating circuit 28a outputs the second scan on signal Vg3 and the second scan off signal Vg4 to the scan drive circuit 28, which is in the control circuit Under the control of 25, the second scan on signal Vg3 and the second scan off signal Vg4 are respectively output to the corresponding scan lines 281, and the data driving 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 provides a second common voltage Vc2 to the plurality of common electrodes 101 . Thus, the touch display panel 10 is driven to perform image display.

For a liquid crystal display device, the second common voltage Vc2 is generally selected as a constant voltage signal that is unchanged relative to the ground signal GND, for example, (-1)V. In the first period W1 , the modulation signal MGND is, for example, a periodically changing signal with a frequency of 200KHZ and an amplitude of 0.2V, that is, the first reference signal of the modulation signal MGND is 0V, and the second reference signal is 0.2V. Correspondingly, the first common voltage Vc1 is a signal obtained by alternately outputting a voltage signal of (-1)V and a voltage signal of (-0.8)V.

It should be noted that, in FIG. 5 , only the modulation circuit 21 is shown to output the modulation signal MGND to the touch driving circuit 23 , and the modulation circuit 21 to output the modulation signal MGND to other circuits with a ground terminal in the domain 90 is omitted, such as a common voltage generating circuit 22. The scanning signal generating circuit 28a, etc. However, those skilled in the art can clearly know from the above description that the modulation circuit 21 outputs the modulation signal MGND to other circuits in the domain 90 with a ground terminal.

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

In addition, in some modified embodiments, the scan driving circuit 28 is formed on the touch display panel 10 by, for example, GIP (Gate InPanel) technology, rather than being integrated in the driving chip 20 .

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

Please refer to FIG. 6 and FIG. 7 together. FIG. 6 is a schematic diagram of an exploded structure of an embodiment of the touch display panel 10 shown in FIG. 5 . FIG. 7 is a schematic cross-sectional structure diagram of the touch display panel 10 shown in FIG. 6 . The touch display panel 10 includes a first substrate 106 , a second substrate 107 , and a display medium layer 108 . The display medium layer 108 is a liquid crystal layer in this embodiment, however, it can be changed to correspond to other display media in other embodiments. The pixel electrodes 103 and the control switches 105 of the plurality of pixel points 11 , the plurality of scan lines 281 , and the plurality of data lines 291 are 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 thin film substrate, or the like.

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

Preferably, the plurality of common electrodes 101 are disposed between the display medium layer 108 and the second substrate 107 . In this embodiment, the plurality of common electrodes 101 are located between the display medium layer 108 and the plurality of pixel electrodes 103 . For example, the plurality of common electrodes 101 are located in the same layer, and the plurality of pixel electrodes 103 are located in the same layer, and the two are stacked. In addition, since the touch display device 1 is an example of a liquid crystal display device, correspondingly, the liquid crystal display device is a fringe field switching (Fringe Field Switching, FFS) liquid crystal display device. The plurality of common electrodes 101 are respectively provided with slits 101a. Thereby, a fringe electric field is formed between it and the pixel electrode 103 . In this embodiment, the plurality of pixel electrodes 103 may not be provided with slits, each of which is a whole piece of electrode, however, alternatively, the plurality of pixel electrodes 103 may also be provided with slits, so as to improve the edge Electric field strength.

Please refer to FIG. 8 and FIG. 9 together. FIG. 8 is a schematic cross-sectional structure diagram of another embodiment of the touch display panel 10 shown in FIG. 5 . FIG. 9 is a schematic top view of the touch display panel 10 shown in FIG. 8 . The plurality of common electrodes 101 may also be disposed between the pixel electrodes 103 and the second substrate 107 . The plurality of common electrodes 101 and the plurality of pixel electrodes 103 are stacked. The plurality of pixel electrodes 103 are respectively provided with slits 103 a 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 electrode. However, alternatively, the plurality of common electrodes 101 may also be provided with slits, so as to improve the edge Electric field strength.

In addition, alternatively, the touch display panel 10 may also be an In-Plane Switching (IPS) liquid crystal display panel, or the touch display panel 10 may also be a twisted nematic (Twisted Nematic, TN) liquid crystal display panel, or the touch display panel 10 is any other suitable type of display panel. Wherein, for the IPS liquid crystal display panel, the electric field formed between the pixel electrode 103 and the common electrode 101 is a parallel electric field.

Please refer 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 configured to provide a power supply voltage to the touch display device 1 . The main control chip 3 may be a single chip or a chipset. When the main control chip 3 is a chipset, the chipset includes an application processor (Application Processor, AP) and a power supply chip. Additionally, the chipset may further include a memory chip. Further, the application processor may also be a central processing unit (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 equipment ground, and receives the ground signal GND of the equipment ground. In the first period W1 and the second period W2, the main control chip 3 uses the ground signal GND as a voltage reference.

The main control chip 3, for example, provides display data and related control signals to the display driving circuit 20a. 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 . For example, the main control chip 3 further provides power supply voltage signals ( VDD1 , VDD2 ) to the touch driving circuit 23 and the common voltage generating circuit 22 and other circuits. The touch driving circuit 23 provides a touch driving signal to the common electrode 101 to perform touch sensing, and the main control chip 3 receives the signal output from the signal processing circuit 26 and correspondingly controls whether the electronic device 100 performs a corresponding function. In addition, the main control chip 3, for example, provides a control signal to the control circuit 25, and controls the data selection circuit 24 through the control circuit 25 to control the driving chip 20 to drive the common electrode 101 to perform touch sensing.

It should be noted that, in the first period W1, since the main control chip 3 is located in the domain 80, and the display driving circuit 20a, the touch driving circuit 23 and other circuits are located in the domain 90, therefore, the main control chip located in the domain 80 Signal transmission between the chip 3 and circuits such as the display driving circuit 20a and the touch driving circuit 23 located in the domain 90 needs to be processed by level conversion, for example, to meet the withstand voltage requirements of the electronic components. On the other hand, in the second period W2, if the signal transmission between the main control chip 3 and the display driving circuit 20a, the touch driving circuit 23 and other circuits needs to go through the level conversion process, then the level conversion process is performed. conversion processing, the level conversion processing is not performed.

Please refer to FIG. 3 , FIG. 10 and FIG. 11 together. FIG. 10 is a structural block diagram of an embodiment of the signal processing circuit 26 shown in FIG. 3 . 11 is a schematic structural diagram of an embodiment of a signal processing unit 261 of the signal processing circuit 26 shown in FIG. 10 . The signal processing circuit 26 includes a plurality of signal processing units 261 . Each signal processing unit 261 is correspondingly connected to an operational amplifier 231 for processing and calculating the sensing signal 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 calculates and obtains touch coordinates according to the digital signal. The computing unit 265 is connected to the main control chip 3 , and is used for outputting a signal representing the touch coordinates to the main control chip 3 . The main control chip 3 correspondingly controls the electronic device 100 to perform corresponding functions according to the signal representing the touch coordinates.

It should be noted that the structure of the signal processing circuit 26 is not limited to the structure shown in FIG. 10 . For example, a signal processing unit 261 may be shared by a plurality of operational amplifiers 231 , rather than corresponding to each operational amplifier 231 . A signal processing unit 261 is connected.

In addition, it is also possible to add corresponding circuit modules to the operational amplifier 231 and the signal processing unit 261 or to omit some circuit modules, or it is also possible to use other circuit modules or circuit units to achieve the same function. Specifically, for example, a filtering unit is further included between the analog-digital signal conversion unit 263 and the second output terminal g2, the filtering unit performs filtering processing on the signal output by the second output terminal g2, and then outputs the filtered signal to the An analog-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 and 90 are different, when signals are transmitted between the two domains 80 and 90, it is necessary to The signal is level-converted to meet the withstand voltage requirements of electronic components. Correspondingly, the driving chip 20 may further include a level conversion unit 264 . The level translation unit 264 spans the two domains 80,90. For example, the calculation unit 265 is connected to the main control chip 3 through the level conversion unit 264 . The level conversion unit 264 is configured to perform level conversion on the signal representing the touch coordinates output by the calculation 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 grounding element, such as a grounding line L1. The ground line L1 is, for example, disposed around the plurality of pixel points 11 . Of course, the grounding element is not limited to the grounding line L1. In addition, the scan driving circuit 28 can be integrated on the touch display panel 10 (Gate In Panel, GIP), for example, and correspondingly, the grounding element can also be the grounding 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 terminal 201 and a second ground terminal 203 . The modulation circuit 21 is connected between the first ground terminal 201 and the second ground terminal 203 . The first ground terminal 201 is connected to the ground element on the touch display panel 10 , and in this embodiment, the first ground terminal 201 is connected to the ground line L1 . The second ground terminal 203 is connected to the equipment 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 outputs the modulation signal MGND through the first ground terminal 201 The terminal 201 outputs the ground signal GND to the touch display panel 10 .

The ground terminals of the circuits in the domain 90 are, for example, connected between the modulation circuit 21 and the first ground terminal 201 , and the ground terminals of the circuits in the domain 80 are connected, for example, between the modulation circuit 21 and the first ground terminal 201 . between the second ground terminals 203 .

For example, the driving chip 20 may further include a slope controller 204, the slope controller 204 is connected to the modulation circuit 21 for controlling the slope of the modulation signal output by the modulation circuit 21, so as to reduce electromagnetic interference (EMI) . In addition, the said slope controller 204 is provided in the domain 80 with reference to GND, for example. Of course, in other embodiments, the slope controller 204 may 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 conversion unit 264 is further connected to the control circuit 25 . The display processing circuit 205 is used to perform corresponding processing (eg, storage, decompression, color adjustment, etc.) on the display data from the main control chip 3 . The level conversion unit 264 is arranged between the display processing circuit 205 and the control circuit 25, and is used to perform level conversion on the display data processed by the display processing circuit 205, and output the level converted display data to the control circuit 25. The control circuit 25 outputs corresponding display data and timing signals to the display driving circuit 20a. The display driving circuit 20a converts the received display data into gray-scale voltages, and outputs the first gray-scale voltage Vd1 to the corresponding pixel electrodes 103 in the first period W1 according to the timing signal to perform image display refresh, and in the second period W2 outputs the second gray-scale voltage Vd2 to the corresponding pixel electrode 103 to perform image display refresh. The display data is preferably a digital signal.

It should be noted that, in the second period W2, when the ground modulation scheme is not used, 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 Signals between 25 and 25 may not be level-converted, however, in the first period W1, a modulation grounding technical solution is adopted. Since the voltage reference of domain 80 and domain 90 are different, level-conversion is required.

In this embodiment, the division of each circuit module or circuit unit in the driver chip 20 in the two domains 80 and 90 is as follows: the display driver circuit 20a, the touch driver circuit 23, the signal processing circuit 26, the data selection circuit 24, and control circuit 25 are divided into domain 90 based on MGND, in addition, touch display panel 10 is also divided into domain 90; modulation circuit 21, display processing circuit 205, voltage generation circuit 27, slope controller 204 are divided into In the domain 80 referenced to GND; the level conversion unit 264 spans two domains, that is, a part in the domain 80 and a part in the domain 90, for those of ordinary skill in the art, according to the description of the present application and The circuit principle is that it can be determined that the level conversion unit 264 is located in the part of the domain 80 and the domain 90, which will not be repeated here.

Alternatively, the division of the driver chip 20 in the two domains 80 and 90 in the present invention can also be in other suitable situations, and is not limited to the division described in the above embodiments.

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

In addition, the amplitude change of the modulation signal MGND is about 0.2V, so as not to affect the normal operation of the level conversion unit 264, it needs to be based on the level of the incoming signal from the main control chip 3 and the device type of the level conversion unit 264. changes.

Further, since the voltage of 0.2V is smaller than the voltage of 1.8V, the amplitude of the signal modulated by the modulated signal MGND is relatively small. Therefore, the signal between the domain 80 and the domain 90 can also be selected without performing Level conversion, or, for example, the level conversion unit 264 may be provided only in the domain 80 to perform level conversion on 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 as a whole by the modulation signal MGND, the driving chip 20 provides the common electrode 101 with a display driving signal for performing image display, that is, a common voltage, such as , the second common voltage Vc2, after being modulated by the modulation signal MGND, can be applied to drive the common electrode 101 to perform touch sensing at the same time, so that while ensuring the touch display panel 10 performs normal image display, the common electrode 101 can be further driven By performing touch sensing, in addition, the signal-to-noise ratio of the touch display device 1 can be improved, thereby improving the touch sensing accuracy.

Please continue to refer to FIG. 12 , in this embodiment, in the first period W1, since a part of the driver chip 20 is in the domain 80 based on GND, and a part is in the domain 90 based on MGND, therefore , the current in the domain 90 may be backflowed to the domain 80 . 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 driver 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 the power supply voltage to the second power supply terminal 207 through the power supply terminal 31 . The protection circuit 15 is connected between the second power terminal 207 and the first power terminal 206 .

When the modulation signal MGND is a driving signal (ie, the second reference signal), the protection circuit 15 correspondingly disconnects the connection between the first power supply terminal 206 and the second power supply terminal 207; when the 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 disposed outside the driving chip 20 .

Please refer to FIG. 13 , which is a schematic diagram of a circuit structure of an embodiment of the protection circuit 15 . In this embodiment, the protection circuit 15 includes a diode J1. The anode of the diode J1 is connected to the second power supply terminal 207 , and the cathode of the diode J1 is connected to the first power supply terminal 206 .

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

The protection circuit 15 is not limited to the above embodiments. For example, please refer to FIG. 14 , which 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 . 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 turn off, and the protection circuit 15a correspondingly disconnects the first power supply terminal 206 and the second power supply terminal 207 When the modulation signal MGND is the ground signal GND, the control unit 153 controls the third active switch 151 to conduct, and the protection circuit 15a correspondingly closes the first power supply terminal 206 and all The connection between the second power terminals 207 is described. The third active switch 151 is, for example, a thin film transistor, a triode, or a metal-oxide-semiconductor field effect transistor.

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

Alternatively, in other embodiments, the modulation circuit 21 can also modulate the power supply or reference power in the driver chip 20 to achieve overall synchronous modulation of all signals of the touch display panel 10 , but not limited. Modulate the device ground. For example, the modulation terminal M of the modulation circuit 21 can be connected or used as the aforementioned first ground terminal 201 (when modulating the ground), and can also be connected or used as the aforementioned first power terminal 206 (when modulating the power supply). ). When connected or used as the first power terminal 206 , the modulation circuit 21 is connected between the first power terminal 206 and the second power terminal 207 . The first power terminal 206 is also referred to as a power supply terminal relative to the first ground terminal 201 , and the voltages loaded on the two remain constant.

In addition, in addition to the first power supply terminal 206 and the first ground terminal 201 , the driver chip 20 usually includes a reference power supply terminal (not shown). When the first power supply terminal 206 is used to load the first power supply voltage, the When a ground terminal 201 is used for loading a second power supply voltage, the reference power supply terminal is used for loading a third power supply voltage, and the level of the third power supply voltage is between the level of the first power supply voltage and the level of the second power supply voltage The voltage difference between the first power supply voltage and the second power supply voltage is kept constant, and the voltage difference between the first power supply voltage and the third power supply voltage is kept constant. The reference power terminal can also be used as or connected to the modulation terminal. That is, one of the power supply terminal, the reference power terminal, and the first ground terminal 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, and the driving chip 20 provides the second gray-scale voltage Vd2 to the pixel electrode 103 and the second common voltage Vc2 to the common electrode 101 to drive the The touch display panel 10 performs image display; in the first period W1, the modulation terminal M is loaded with a modulation signal, and the driving chip 20 provides the first gray-scale voltage Vd1 to the pixel electrode 103 and 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 , which 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 storage circuit 2051, the decompression circuit 2053, and the color adjustment circuit 2055 are connected in sequence. The storage circuit 2051 is further connected to the main control chip 3 . The color adjustment circuit 2055 is further connected to the control circuit 25 through the level conversion unit 264 .

The storage circuit 2051 is used for receiving display data from the main control chip 3 and storing the received display data. The decompression circuit 2053 is used to decompress the display data from the main control chip 3 and output the compressed display data to the color adjustment circuit 2055 . The color adjustment circuit 2055 performs color adjustment on the received display data, for example, performs color enhancement processing on the display data, and outputs the adjusted display data to the level conversion unit 264 . The level conversion unit 264 performs level conversion on the received display data, and outputs the level converted display data to the control circuit 25 .

The control circuit 25 outputs corresponding display data and timing signals to the data driving circuit 29 , and further outputs timing signals to the scanning 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 gray-scale voltages, and outputs the corresponding gray-scale voltages to the corresponding data lines 291 according to the timing signals, so as to perform image display refresh.

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

In addition, for the touch display device 1 and the electronic device 100 of the various embodiments of the present application, some elements or combined circuits can also be reduced or added. , and technical solutions that can be reasonably deduced in combination with the technical content of this application shall fall within the protection scope of this 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 conversion unit 264 are all integrated in the single driving chip 20, the single Compared with multiple chips, a chip saves space. Therefore, the touch display device 1 occupies less space in the electronic device 100 . In addition, compared with multiple chips, a single chip is more conducive to the assembly and production management of the touch display device 1 , 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-capacitance touch sensing as an example. Of course, the present application is not limited to this, as long as the touch display device is improved based on the same or similar ideas , shall fall within the protection scope of this application.

In addition to the above-described embodiments of multiplexing common electrodes for self-capacitance touch sensing, the present application can also perform touch sensing by providing an additional layer of touch sensing electrodes, and these embodiments are also feasible.

Although embodiments have been described herein with respect to specific configurations and sequences of operations, 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 examples and not limitations.

Claims (31)

1. A driver chip, characterized in that, in any process of driving a touch display panel to perform image display, further driving the touch display panel to perform touch sensing, the touch display panel comprising a plurality of common electrodes, The driver chip includes: a first ground terminal, the voltage signals output by the driving chip to the touch display panel are all based on the voltage signal on the first ground terminal; a modulation circuit, connected to the first ground terminal, for generating a modulation signal to the first ground terminal; a touch driving circuit, selectively connectable to the plurality of common electrodes, for driving the plurality of common electrodes to perform touch sensing; and A common voltage generating circuit, selectively connectable to the plurality of common electrodes, for driving the plurality of common electrodes to perform image display; When the modulation circuit outputs the modulation signal to the first ground terminal, the touch driving circuit is configured to drive the same common electrode and perform image display and touch sensing simultaneously. 2 . The driving chip of claim 1 , wherein when the touch driving circuit drives the touch display panel to perform touch sensing, the voltage signals on the touch display panel are connected to the first ground. 3 . The voltage signal on the terminal is the reference. 3 . The driving chip according to claim 1 , wherein when the touch driving circuit drives the touch display panel to perform touch sensing, the voltage signals on the touch display panel vary with the modulation signal. 4 . Rising increases and decreases as the modulating signal decreases. 4 . The driving chip of claim 1 , wherein the touch driving circuit is configured to drive the plurality of common electrodes to perform self-capacitance touch sensing. 5 . 5 . The driving chip according to claim 1 , wherein the touch driving circuit is configured to drive the plurality of common electrodes to perform touch sensing in a time-sharing manner, and when the touch driving circuit drives some common electrodes to perform image display During touch sensing, the common voltage generating circuit drives the remaining common electrodes to perform image display. 6 . The driving chip of claim 5 , wherein when the touch driving circuit is used to drive the plurality of common electrodes to perform touch sensing in a time-sharing manner, the touch driving circuit outputs touch driving to the common electrodes. 7 . The signal is the same as the first common voltage output by the common voltage generating circuit to the common electrode. 7 . The driving chip of claim 6 , wherein the touch driving signal and the first common voltage are signals modulated by the modulation signal by the same voltage signal. 8 . 8 . The driving chip according to claim 1 , wherein the modulation circuit also outputs a ground signal to the first ground terminal, and the modulation circuit is used for alternately outputting the modulation signal and the ground signal. 9 . to the first ground terminal. 9 . The driver chip of claim 8 , wherein when the modulation circuit outputs the ground signal to the first ground terminal, the driver chip drives the touch display panel to perform image display instead of image display. 10 . Simultaneous touch sensing. 10 . The driver chip according to claim 9 , wherein the driver chip further comprises a second ground terminal and a voltage generating circuit, the second ground terminal is used for connecting to a device ground, receiving the ground signal, 10 . The voltage generating circuit is used for generating a driving signal; the modulation circuit is connected between the first ground terminal and the second ground terminal, and is further connected with the voltage generation circuit; the modulation circuit is connected according to the The ground signal and the drive signal generate the modulated signal. 11. The driving chip of claim 10, wherein the voltage signal on the voltage generating circuit is based on the ground signal. 12 . The driving chip of claim 10 , wherein when the modulation circuit continues to output the modulation signal for a first predetermined time, the modulation circuit continues to output the ground signal for a second predetermined time. 13 . 13. The driving chip according to any one of claims 1-12, wherein the touch driving circuit comprises a signal source and a plurality of operational amplifiers, each operational amplifier is connected to the signal source, and can be selected The common electrode of the sexual connection part; the common voltage generating circuit includes the signal source, a follower, and a voltage-stabilizing circuit; the follower is connected between the signal source and the voltage-stabilizing circuit, and the follower is further The plurality of common electrodes may be selectively connected. 14. The driving chip of claim 13, wherein when the modulation circuit outputs the modulation signal to the first ground terminal, the signal source outputs a first reference voltage signal to the plurality of an operational amplifier and the follower, the plurality of operational amplifiers output the same touch driving signal as the first reference voltage signal to some common electrodes, and the follower outputs the same first reference voltage signal as the first reference voltage signal The common voltage is given to the other common electrodes, and the voltage stabilizing circuit is used for stabilizing the first common voltage output by the follower. 15 . The driving chip of claim 14 , wherein the driving chip further comprises a control circuit, the control circuit is configured to be connected to a data selection circuit, and the follower communicates with the data selection circuit through the data selection circuit. 16 . The plurality of common electrodes can be selectively connected, and each operational amplifier can be selectively connected to a part of the common electrodes through the data selection circuit. 16. The driving chip according to claim 15, wherein when the modulation circuit outputs the modulation signal to the first ground terminal, the data selection circuit is controlled by the control circuit, and the common The voltage generating circuit drives the plurality of common electrodes to perform image display in time division, and the touch driving circuit drives the plurality of common electrodes to perform image display and touch sensing in time division. 17 . The driving chip of claim 15 , wherein when the modulation circuit outputs the ground signal to the first ground terminal, the data selection circuit is controlled by the control circuit, and the common The voltage generating circuit is respectively connected to the plurality of common electrodes, and the touch driving circuit is disconnected from the plurality of common electrodes. 18. The driver chip of claim 15, wherein the driver chip comprises the data selection circuit. 19 . The driving chip of claim 15 , wherein the driving chip further comprises a plurality of signal processing circuits, which are connected to the plurality of operational amplifiers, and the plurality of operational amplifiers are further configured to receive signals from the common electrode. 20 . The output touch sensing signal, the plurality of signal processing circuits are used for obtaining touch position information according to the touch sensing signal. 20 . The driving chip of claim 19 , wherein the voltage signals on the plurality of signal processing circuits are all based on the voltage signals on the first ground terminal. 21 . 21. The driving chip of claim 19, wherein the driving chip further comprises a level conversion unit, the plurality of signal processing circuits are connected to the level conversion unit, and the level conversion unit is used for Level-converting touch position information from the plurality of signal processing circuits. 22 . The driving chip of claim 21 , wherein the voltage signal on the level conversion unit is based on a ground signal, or the voltage signal of some circuits on the level conversion unit is based on the ground signal. 23 . The voltage signal on the second ground terminal is used as a reference, and the voltage signals of other circuits are based on the voltage signal on the first ground terminal. 23. The driving chip according to claim 21, wherein the touch display panel further comprises a plurality of pixel electrodes for forming a fringe electric field or a parallel electric field with the plurality of common electrodes; the driving chip further comprises A data driving circuit, the data driving circuit is used for driving the plurality of pixel electrodes to perform image display refresh. 24. The driving chip according to claim 23, wherein the modulation signal is output to the first ground terminal through the modulation circuit, the data driving circuit, the common voltage generating circuit, and the The touch driving circuits cooperate together to drive the touch display panel to perform image display refresh and touch sensing simultaneously. 25. The driver chip of claim 24, wherein the touch display panel further comprises: multiple scan lines; a plurality of data lines, which are insulated and cross-arranged with the plurality of scan lines; and a plurality of control switches, each control switch includes a control electrode, a first transmission electrode, and a second transmission electrode, the control electrode is used for connecting the scan line, the first transmission electrode is used for connecting the data line, the second transfer electrode is used to connect the pixel electrode; The driver chip further includes: A scan signal generating circuit, connected to the plurality of scan lines through a scan drive circuit, used to generate a scan turn-on signal or a scan turn-off signal to the plurality of scan lines, and control the connection with the scan line that receives the scan turn-on signal The switch is turned on, and the control switch connected to the scan line that receives the scan-off signal is turned off; The data driving circuit is configured to output corresponding gray-scale voltages to corresponding pixel electrodes through the plurality of data lines and the activated control switches; Wherein, the signals on the data driving circuit and the scanning signal generating circuit are both based on the voltage signal on the first ground terminal. 26 . The driving chip of claim 25 , wherein the driving chip comprises the scan driving circuit, and the scan driving circuit is used for activating the control switches of each row one by one. 27 . 27. The driving chip of claim 25, wherein the control circuit is configured to be connected to the scan driving circuit and the data driving circuit respectively, to provide scan timing signals to the scan driving circuit and to provide display data to the data driving circuit. 28. The driving chip of claim 27, wherein the driving chip further comprises a display processing circuit, the display processing circuit is connected to the control circuit through the level conversion unit, and the display processing circuit It is used to receive display data from a main control chip, store, decompress, and adjust the color of the display data, and output the adjusted display data to the level conversion unit; the level conversion unit The received display signal is level-converted, and the level-converted display data is output to the control circuit. 29. The driver chip of claim 1, wherein the driver chip is a single chip. 30. A touch display device, comprising a touch display panel and a driver chip, wherein the driver chip is used to drive the touch display panel to perform image display and touch sensing, wherein the driver chip is one of the above claims 1-29 Any one of the driver chips. 31. An electronic device, comprising the touch display device of claim 30.