WO2018058647A1

WO2018058647A1 - Touch display unit and electronic device

Info

Publication number: WO2018058647A1
Application number: PCT/CN2016/101339
Authority: WO
Inventors: 林峰
Original assignee: 深圳深微创芯科技有限公司
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2018-04-05
Also published as: CN209044540U

Abstract

A touch display unit (1) and an electronic device (100). The touch display unit (1) comprises a touch display panel (10) and a driver circuit (20). The touch display panel (10) comprises multiple pixel electrodes (103) and multiple common electrodes (101). The driver circuit (20) is used for driving the touch display panel (10) to perform image displaying, and further used for driving the common electrodes (101) to perform touch sensing. When the driver circuit (20) drives the touch display panel (10) to simultaneously perform image displaying and touch sensing, signals on the multiple pixel electrodes (103) are first gray-scale voltages (Vd1), and signals on the multiple common electrodes (101) are first common voltages (Vc1), wherein the first gray-scale voltages (Vd1) and the first common voltages (Vc1) are all signals modulated by a modulation signal. The electronic device (100) comprises the touch display unit (1).

Description

Touch display device and electronic device

Technical field

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

Background technique

Generally, touch display devices include three types of touch display panels: an external type, an On-Cell (in-box type), an In-Cell (in-box type or in-line type). With the development of technology, in order to further thin the touch display panel and improve the brightness of the touch display panel, the In-Cell type touch display panel has gradually become a trend.

The touch display device is exemplified as a liquid crystal display device. Generally, the liquid crystal display device includes a liquid crystal display panel and a driving circuit for driving the liquid crystal display panel to perform image display and touch sensing. The liquid crystal display panel includes a plurality of scan lines, a plurality of data lines, and a plurality of transistors, a plurality of pixel electrodes, and a plurality of common electrodes. Each transistor includes a gate, a source, and a drain. Wherein, the gate is connected to the scan line, the source is connected to the data line, and the drain is connected to the pixel electrode. The driving circuit is configured to provide a scan signal to the scan line, activate a transistor connected to the scan line, provide a gray scale voltage to the pixel electrode through the data line and the activated transistor, and provide a common voltage to the common electrode to drive the liquid crystal display The panel performs an image display refresh.

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

Existing liquid crystal display devices generally employ touch sensing on a touch sensing electrode at a line gap. In general, in order to perform touch sensing in conjunction with ensuring the duration of touch sensing, the time of the line gap is generally extended. The touch sensing electrodes are, for example, multiplexed common electrodes. When the common electrode is multiplexed as a touch sensing electrode, the driving circuit typically provides a touch driving signal different from the common voltage to perform touch sensing to the common electrode. Generally, the common voltage is a constant voltage signal with respect to the ground signal GND (for example, 0 volts), and the touch drive signal is a square wave pulse signal having a predetermined frequency with respect to the ground signal GND to improve Touch the signal to noise ratio of the sensing signal. It can be seen that the liquid crystal display device performs image display refresh and touch sensing in a time-sharing manner, thereby reducing the mutual influence between image display and touch sensing to some extent.

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

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is required to provide a touch display device and an electronic device.

The invention provides a touch display device, comprising:

Touching the display panel, comprising a plurality of pixel electrodes and a plurality of common electrodes, wherein the plurality of pixel electrodes and the plurality of common electrodes are used to form a fringe electric field; and

a driving circuit, configured to drive the touch display panel to perform image display, and further configured to drive the common electrode to perform touch sensing;

When the driving circuit drives the touch display panel while performing image display refresh and touch sensing, the signals on the plurality of pixel electrodes are the first gray scale voltage, and the signals on the plurality of common electrodes are the same a first common voltage, wherein the first gray scale voltage and the first common voltage are both signals modulated by a modulation signal.

Optionally, the first gray scale voltage and the first common voltage both increase with an increase of the modulation signal, and decrease with a decrease of the modulation signal.

Optionally, the first gray scale voltage and the first common voltage are both signals that are synchronously modulated by the modulation signal.

Optionally, the driving circuit is configured to provide the same first common voltage to perform image display on the plurality of common electrodes, and also to receive touch sensing from the plurality of common electrode outputs simultaneously or simultaneously Signal to get touch information.

Optionally, when the driving circuit provides the first gray scale voltage to a portion of the pixel electrodes, providing the same first common voltage to the plurality of common electrodes, driving the touch display panel while performing image display refresh and touch During sensing, the remaining signals on the pixel electrodes in the floating state are superimposed by the modulation signal due to capacitive coupling.

Optionally, the plurality of pixel electrodes are located in the same layer, the plurality of common electrodes are located in the same layer, and the plurality of pixel electrodes are stackedly disposed with the plurality of common electrodes, wherein the plurality of common electrodes The number of the plurality of pixel electrodes is smaller than the number of the plurality of pixel electrodes.

Alternatively, when the driving circuit drives the touch display panel while performing image display refresh and touch sensing, the pixel electrodes performing image display refresh do not overlap with the common electrode performing touch sensing.

Optionally, the touch display panel further includes:

Multiple scan lines;

Multiple data lines;

a plurality of transistor switches, each transistor switch comprising a control electrode, a first transfer electrode, and a second transfer electrode, The control electrode is connected to the scan line, the first transfer electrode is connected to the data line, and the second transfer electrode is connected to the pixel electrode;

When the driving circuit drives the touch display panel while performing image display and touch sensing, signals on the plurality of scan lines are signals modulated by the modulation signal.

Optionally, the driving circuit is configured to provide a first scan enable signal to the scan line, activate a transistor switch connected to the scan line, provide a first gray scale voltage to the plurality of data lines, and activate Transmitting a transistor switch to a corresponding pixel electrode, providing the same first common voltage to the plurality of common electrodes, and receiving a touch sensing signal from the common electrode output to drive the touch display panel while performing image display refresh and self Capacitive touch sensing.

Optionally, the driving circuit includes a modulation circuit, a first ground end, and a second ground end, the modulation circuit is connected between the first ground end and the second ground end, the second ground The end is configured to receive a ground signal, the modulation circuit is configured to generate the modulation signal according to the ground signal and a driving signal, and output the modulation signal to the first ground end, when the signal of the first ground end When the signal is modulated, the signals on the touch display panel are signals modulated by the modulation signal.

Optionally, when the signal of the first ground is the modulation signal, the signal on the touch display panel or the signal from the output of the driving circuit, or the modulation signal is superimposed by capacitive coupling.

Optionally, the driving circuit further includes a common voltage generating circuit, a touch driving circuit, and a data selecting circuit, wherein the data selecting circuit is respectively connected to the plurality of common electrodes, and the common voltage generating circuit passes the a data selection circuit selectively connectable to the plurality of common electrodes, the touch drive circuit being selectively connectable to the plurality of common electrodes by the data selection circuit, the common voltage generation circuit for passing the data The selection circuit provides the first common voltage to perform image display to the common electrode, and the touch drive circuit is configured to provide the first common voltage to the common electrode through the data selection circuit while performing image display and touch sensing.

Optionally, the driving circuit further includes a control circuit, the control circuit is connected to the data selection circuit, and the control circuit controls the common voltage generating circuit and the plurality of The number of connections of the common electrode and the number of connections between the touch drive circuit and the plurality of common electrodes.

Optionally, the control circuit, the common voltage generating circuit, the touch driving circuit, and the data selecting circuit are all connected to the first ground.

Optionally, when the touch driving circuit supplies the first common voltage to a part of the common electrode through the data selection circuit while performing image display and touch sensing, the common voltage generating circuit provides the first common voltage to the rest all or Part of the common electrode performs image display.

Optionally, the data selection circuit includes a first data selector and a plurality of second data selectors, wherein the common voltage generating circuit is selectively selectable by the first data selector and the plurality of common electrodes Connected, the touch drive circuit is selectively connectable to the plurality of common electrodes by the plurality of second data selectors, and each of the second data selectors is configured to connect a portion of the common electrode.

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

Optionally, the plurality of first output ports of the first data selector are connected in one-to-one correspondence with the plurality of second output ports of each second data selector, or multiple of the first data selectors The first output port is connected to a portion of the second output port of the second data selector, or the plurality of first output ports of the first data selector and the plurality of second output ports of the portion of the second data selector are A corresponding connection.

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

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

Optionally, the common voltage generating circuit includes:

a signal source comprising a ground end and an output end, the ground end being connected to the first ground end; and

a follower connected to the first ground, the follower being selectively connectable to the plurality of common electrodes by the data selection circuit, the follower for transmitting a signal output by the signal source The data selection circuit.

Optionally, the touch driving circuit includes:

The signal source; and

a plurality of operational amplifiers each connected to the first ground terminal, each operational amplifier being selectively connectable to a portion of the common electrode through the data selection circuit, the operational amplifier for transmitting the output signal of the signal source A circuit is selected for the data, and a touch sensing signal from the common electrode is transmitted.

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

Optionally, the follower includes a first amplifier, and the first amplifier includes a third power terminal, a third ground terminal, a first non-inverting terminal, a first inverting terminal, and a first output terminal, where The third power terminal is used to load a power voltage, the third ground terminal is connected to the first ground terminal, and the first in-phase terminal is connected to an output end of the signal source, the first inverting terminal Connected to the first output, the first output is for selectively connecting to the plurality of common electrodes through a data selection circuit.

Optionally, each operational amplifier includes a second amplifier and a feedback branch; the second amplifier includes a fourth power terminal, a fourth ground terminal, a second non-inverting terminal, a second inverting terminal, and a second output terminal, The fourth power terminal is used to load a power voltage, the fourth ground terminal is connected to the first ground terminal, and the second non-phase terminal is connected to an output end of the signal source. The second inverting terminal is coupled to the second output terminal through a feedback branch, and the second inverting terminal is further selectively connectable to a portion of the common electrode through a data selection circuit.

Optionally, when the modulation circuit outputs the modulation signal to the first ground, the signal source correspondingly outputs a first reference voltage signal modulated by the modulation signal to the first in-phase terminal And the second non-inverting terminal, the operational amplifier and the follower correspondingly output the same common voltage to the plurality of common electrodes through the data selection circuit to drive the touch display panel Image display and touch sensing are performed simultaneously.

Optionally, the driving circuit further includes a signal processing circuit connected to the second output terminal for receiving a touch sensing signal output by the common electrode to acquire touch information.

Optionally, the signal source is a direct current source.

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

Optionally, the first common voltage remains unchanged with respect to the modulation signal.

Optionally, the driving circuit is configured to drive the plurality of common electrodes to perform image display by providing the same first common voltage to the plurality of common electrodes when the image display refresh is performed by driving the touch display panel, And further driving the common electrode to perform touch sensing.

Optionally, the driving circuit further includes a voltage generating circuit, the voltage generating circuit is configured to generate the driving signal, and the second ground is used to connect to a device ground, and receive a ground signal from a device ground, A modulation circuit generates the modulation signal based on the drive signal and the ground signal.

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

When the driving circuit drives the touch display panel while performing image display and touch sensing, the signals on the plurality of pixel electrodes are the first gray scale voltage, and the signals on the plurality of common electrodes are the first a common voltage, wherein the first gray scale voltage and the first common voltage are signals modulated by a modulation signal, and therefore, the touch display device can perform a touch feeling in any process of performing image display Measured, and the interaction between touch sensing and image display is small. Accordingly, the user experience of the electronic device having the touch display device is better.

DRAWINGS

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

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

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

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

FIG. 5 is a schematic diagram showing the circuit structure of a signal source of a conventional touch driving circuit.

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

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

FIG. 8 is an exploded perspective view of an embodiment of the touch display panel of FIG. 7. FIG.

9 is a cross-sectional structural view of the touch display panel of FIG. 8.

FIG. 10 is a cross-sectional structural view showing another embodiment of the touch display panel shown in FIG. 7. FIG.

11 is a top plan view of the touch display panel of FIG. 10.

Figure 12 is a block diagram showing the structure of an embodiment of the signal processing circuit shown in Figure 3.

FIG. 13 is a block diagram showing an embodiment of a signal processing unit of the signal processing circuit shown in FIG.

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

FIG. 15 is a schematic diagram showing the circuit structure of an embodiment of the protection circuit shown in FIG. 14.

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

detailed description

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

Furthermore, the described features, structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth However, those skilled in the art will appreciate that the technical solution of the present invention can be practiced without one or more of the specific details or other structures, components, and the like. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

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

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

For a display device, the display device includes a display panel and a drive circuit. The driving circuit is configured to drive the display panel to perform image display. The display panel generally includes a plurality of pixel points, each of the pixel points includes a first electrode and a second electrode. In operation, a pressure difference between the first electrode and the second electrode determines a display gray level of the pixel point. level. The first electrodes of the plurality of pixel points are, for example, a structure that is integrally connected to each other, and is an entire layer of electrodes, and the second electrodes of the plurality of pixel points are structures that are separated from each other. The driving circuit provides different voltages to the second electrodes of the respective pixel points by supplying the same voltage to the first electrodes of the respective pixel points (for example, 0 volts), thereby realizing image display of different gray levels. .

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

For each pixel, its image display state generally includes an image display refresh state and an image display hold state. Taking a single pixel as an example, when the driving circuit supplies a gray scale voltage to the second electrode and supplies a common voltage to the first electrode, the pixel starts to perform image display refresh, when the gray scale voltage is written to the first After the two electrodes, the supply of the gray scale voltage to the second electrode is stopped, and the image display refresh is completed. Thereafter, the pixel enters the image display hold state until the pixel point receives the gray scale voltage next time.

It should be noted that the process of image display refreshing may further include pre-charging or pre-discharging the second electrode, and providing a grayscale voltage of the predetermined grayscale picture to the second electrode when the second electrode of the same row reaches the same voltage. .

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

Generally, the plurality of pixel points are arranged, for example, in a matrix. The drive circuit typically performs an image display refresh on a row-by-row or row-by-row basis.

It is pointed out here that the image display refresh and the image display maintain these two different display states in order to better understand the various embodiments of the present invention described below. In addition, it is clear that "image display refresh" and "image display hold" are two different technical concepts.

It should be noted that the specific names of the first electrode and the second electrode in different types of display devices are different. For each suitable type of display device to which the present application is applied, the first electrode is collectively referred to as a common electrode. The second electrode is a pixel electrode. Correspondingly, the display voltage signal supplied to the first electrode by the driving circuit is a common voltage, and the display voltage signal supplied to the second electrode is a gray scale voltage.

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

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

In contrast, in a self-capacitance based touch system, each touch pixel can be formed by an individual electrode that forms a self-capacitance to ground. When an object approaches the touch pixel, another capacitance to ground may be formed between the object and the touch pixel. The other pair of ground capacitances can result in a net increase in self-capacitance experienced by the touch pixel. This self-capacitance increase can be detected and measured by the touch system to determine the location of the object as it touches the touch screen.

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

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic diagram showing the structure of an electronic device according to the present invention. 2 is a waveform diagram of an embodiment of a partial signal of the electronic device shown in FIG. 1. The electronic device 100 is a variety of suitable types of products, such as a portable electronic product, a smart home electronic product, and an in-vehicle electronic product. The present invention is not limited thereto. The portable electronic product is, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, or the like. The smart home electronic product is, for example, a desktop computer, a refrigerator, a washing machine, a television, or the like. The in-vehicle electronic products are, for example, navigators, car DVDs, and the like. The electronic device 100 includes a touch display device 1. The touch display device 1 is used to implement image display and touch sensing. The touch display device 1 is an In-Cell (in-box type or in-line type) touch display device. The display device in the touch display device 1 is, for example, a liquid crystal display device. Accordingly, the touch display device 1 is a touch liquid crystal display device. The following mainly describes a touch liquid crystal display device as an example. However, the display device in the touch display device 1 may be other suitable types of display devices, such as an electronic paper display device (EPD) or the like.

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

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

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

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

When the driving circuit 20 drives the touch display panel 10 while performing image display and touch sensing, all electrical signals on the touch display panel 10 are signals modulated by a modulation signal MGND. Each of the electrical signals on the touch display panel 10 rises, for example, as the modulation signal MGND rises, and decreases as the modulation signal MGND decreases.

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

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

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

The driving circuit 20 may further drive the common electrode 101 to perform self-capacitance touch sensing while providing the same first common voltage Vc1 to the plurality of common electrodes 101 for image display. The first common voltage Vc1 is a signal modulated by the modulation signal MGND. For example, the voltage difference between the first common voltage Vc1 and the modulation signal MGND remains unchanged. The first common voltage Vc1 remains unchanged with respect to the modulation signal MGND. However, the first common voltage Vc1 may also be a signal that changes relatively with a voltage difference between the modulation signal Vc1. Preferably, the first common voltage Vc1 is a signal that changes with respect to the ground signal GND. The ground signal GND is, for example, a constant voltage signal of 0 V (volts), but is not limited to a constant voltage signal of 0 V, and may be a constant voltage signal close to 0 V, which is usually on the ground of the device of the electronic device 100. Voltage signal. The device is also referred to as a system, for example, a negative pole of a power supply of the electronic device 100, and the power supply is a battery. The ground signal GND is also called a system Ground voltage, system ground signal, equipment ground voltage, or equipment ground signal. Typically, the device is not earthy or absolutely earthy. However, when the electronic device 100 is connected to the earth through a conductor, the device ground may also be the earth's earth.

Taking a common electrode 101 as an example, when the driving circuit 20 drives the common electrode 101 while performing image display and touch sensing, the first common voltage Vc1 supplied to the common electrode 101 is simultaneously used as a display driving signal and a touch driving. a signal; when the driving circuit 20 drives the common electrode 101 to perform image display instead of simultaneously performing touch sensing, the first common voltage 101 supplied to the common electrode 101 is used as a display driving signal instead of simultaneously serving as a touch driving signal .

The driving circuit 20 may drive the plurality of common electrodes 101 to perform touch sensing in a time division manner, and may also drive the plurality of common electrodes 101 to simultaneously perform touch sensing.

Correspondingly, when the driving circuit 20 drives the plurality of common electrodes 101 while performing touch sensing, the first common voltage Vc1 supplied to the plurality of common electrodes 101 is simultaneously used as a touch driving signal; When the driving circuit 20 drives the plurality of common electrodes 101 to perform touch sensing in a time division manner, the first common voltages Vc1 supplied to the plurality of common electrodes 101 are not all used as touch driving signals at the same time. Therefore, the first common voltage Vc1 that the driving circuit 20 drives the common electrode 101 to perform touch sensing may also be referred to as a touch driving signal.

When the driving circuit 20 drives the plurality of common electrodes 101 to perform touch sensing in a time division manner, although the driving circuit 20 supplies the same first common voltage Vc1 to the plurality of common electrodes 101, the driving circuit The circuit structure in which the common electrode 101 is driven to perform image display and touch sensing at the same time is different from the circuit structure in which the driving common electrode 101 performs image display instead of simultaneously performing touch sensing.

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

For better understanding, referring to FIG. 7, for the display voltage difference between the common electrode 101 and the pixel electrode 103 of the pixel 11 , the signals on the common electrode 101 and the pixel electrode 103 are subjected to the modulation signal MGND. After the synchronous modulation, the display voltage difference does not change, the image is normally displayed, and the first common voltage Vc1 supplied to the common electrode 101 is a signal modulated by the modulation signal MGND, and the first common voltage Vc1 is relative to the ground signal. GND is a varying signal, so that the common electrode 101 can be simultaneously driven to perform self-capacitance touch sensing while ensuring that the touch display panel 10 normally displays an image.

For the pixel point 11 performing the image display refresh and the pixel point 11 performing the image display holding, the signal on the pixel electrode 103 of the pixel point 11 performing the image display refresh is the modulated signal supplied from the drive circuit 20, and is executed. The image shows that the signal on the pixel electrode 103 of the held pixel point 11 is superimposed by 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, and an ultra high definition (UHD) display device, and correspondingly, the display resolution is, for example, 1280×720, 1920×1080, 3840x2160. However, the display resolution is not limited thereto. For example, when the display resolution is 2K, 2K may be 1920x1080, or may be 2560X1440 or the like. Similarly, when the display resolution is 4K, 8K, various situations may also be included. However, for the touch display device 1, it is possible to perform touch sensing simultaneously in any process of image display, and touch sensing is not performed. Affects normal image display. That is, the touch display device 1 can simultaneously perform image display and self-capacitive touch sensing.

In particular, when driving the touch display panel 10 to perform image display refreshing, the driving circuit 20 can drive the common electrode 101 to perform self-capacitance touch sensing together to acquire touch information. The image display refresh and the self-capacitive touch sensing can coexist at the same time, and the image display and the touch sensing quality of the touch display device 1 are high.

Since the signal on the touch display panel 10 is synchronously modulated by the modulation signal MGND, and the modulated first common voltage Vc1 can be used as both the display driving signal and the touch driving signal, the touch display device 1 can Image display refresh and self-capacitive touch sensing are simultaneously performed, and there is no interference or interference between the image display and the 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 circuit 20, for example, a line gap I (shown in FIG. 2) and a frame gap, the driving circuit 20 also The self-capacitive touch sensing can be performed by driving the common electrode 101 together. At this time, the touch display panel 10 is entirely in the state of image display hold, and since the signal output from the drive circuit 20 to the touch display panel 10 is synchronously modulated by the modulation signal MGND, the touch sensing is not changed. The display voltage difference between the two

electrodes

101, 103 of the pixel 11 (see FIG. 7), correspondingly, the image display of the touch display panel 10 and the quality of the touch sensing are better.

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

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

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

In the present application, whether the driving circuit 20 drives a common electrode 101 to perform touch sensing every time, or drives the partial common electrode 101 to perform touch sensing at a time, as long as the driving circuit 101 drives the plurality of times by multiple times. The common electrodes 101 perform one touch sensing, that is, the drive circuit 20 is defined to drive the plurality of common electrodes 101 to perform touch sensing.

Specifically, the driving circuit 20 simultaneously supplies the first common voltage Vc1 to the plurality of common electrodes 101, and receives the touch sensing signals from the plurality of common electrodes 101 in a time-sharing manner to realize simultaneous driving. The plurality of common electrodes 101 perform image display, and the plurality of common electrodes 101 are time-divisionally driven to perform self-capacitance touch sensing.

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

Performing self-capacitive touch sensing for the driving circuit 20 to drive the plurality of common electrodes 101 in a time division manner may be, for example, the driving circuit 20 performing self-capacitance touch sensing by the row driving common electrode 101. When the driving circuit 20 supplies the first common voltage Vc1 to perform self-capacitance touch sensing and image display for one row of the common electrodes 101, the first common voltage Vc1 is also supplied to perform image display to the common electrodes 101 of the remaining rows. After the driving circuit 20 drives the row of common electrodes 101 to perform self-capacitive touch sensing, next, the common electrode 101 driving another row performs self-capacitance touch sensing and image display, and drives the remaining rows of the common electrode 101 to perform an image. display. Thus, one touch sensing drive for all the common electrodes 101 is completed by a plurality of times.

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

Since the driving circuit 20 drives the common electrode 101 to perform self-capacitance touch sensing in a time division (eg, in a row or row by row), the output pin of the chip in which the driving circuit 20 is integrated is driven at the same time as all The common electrode 101 performs self-capacitance touch sensing, and the output pin of the chip is small, so that the area of the chip in which the driving circuit 20 is integrated can be reduced, thereby achieving cost saving.

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

Further, self-capacitive touch sensing is performed on the driving circuit 20 to drive the plurality of common electrodes 101 in a time-sharing manner: the driving circuit 20 drives the common electrode 101 to perform touch sensing between successive driving, that is, continuous driving, that is, driving The circuit 20, after simultaneously driving the partial common electrode 101 to perform touch sensing, then simultaneously drives another portion of the common electrode 101 to perform touch sensing; or, the driving circuit 20 intermittently drives the plurality of common electrodes 101 to perform self-capacitive touch sensing For example, the driving circuit 20 stops performing the touch sensing driving for a second predetermined time after the driving common electrode 101 performs the touch sensing for the first predetermined time, and then drives the common electrode 101 to perform the touch sensing.

However, when the driving circuit 20 simultaneously drives the plurality of common electrodes 101 to perform touch sensing, an intermittent driving method may also be employed. That is, after the driving circuit 20 simultaneously drives the plurality of common electrodes 101 to perform touch sensing for a first predetermined time, stopping performing touch sensing driving for a second predetermined time, and then simultaneously driving the plurality of public The electrode 101 performs touch sensing.

It is also possible that the driving circuit 20 can perform touch sensing on the plurality of common electrodes 101 in a manner of combining time-division driving and simultaneous driving.

It should be noted that the driving circuit 20 may partially overlap or not overlap the common electrodes 101 that perform touch sensing in two adjacent driving.

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

In the first period W1, the driving circuit 20 synchronously modulates the signal of the touch display panel 10 by using the modulation signal MGND, and correspondingly, the driving circuit 20 outputs the modulated first common voltage Vc1 to the common electrode 101. Image display and self-capacitive touch sensing are performed simultaneously.

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

In each second period W2, the drive circuit 20 outputs a second signal to the touch display panel 10 to perform image display.

Preferably, in the second period W2, the driving circuit 20 does not synchronously modulate the signal of the touch display panel 10 by using the modulation signal MGND. Correspondingly, the first signal is, for example, a signal modulated by the second signal via the modulation signal MGND. The driving circuit 20 outputs the first signal to the touch display panel 10 while performing image display and self-capacitive touch sensing.

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

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

Since the driving circuit 20 does not synchronously modulate the signal of the touch display panel 10 by using the modulation signal MGND in the second period W2, for example, driving is performed by using an existing display driving method, and thus, the touch display device 1 In the second time period W2, the power consumption is relatively reduced compared to the technical solution in which the modulation is employed in the first time period W1.

As can be seen from the above, the driving circuit 20 employs a manner of intermittently driving the plurality of common electrodes 101 to perform touch sensing, and the touch display device 1 can perform self-capacitance touch sensing not only in any process of performing image display, but also Try to avoid the power consumption caused by the modulation scheme.

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

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

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

However, in some embodiments, in the second period W2, the driving circuit 20 may still synchronously modulate the signal of the touch display panel 10 by the modulation signal MGND for display driving.

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

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

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

The touch driving circuit 23 is for driving the same common electrode 101 while performing image display and self-capacitive touch sensing.

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

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

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

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

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

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

Third, the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal.

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

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

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

The modulation signal MGND is, for example, a square wave pulse signal that changes periodically. The modulation signal MGND is not limited to a square wave pulse signal, but may be other suitable waveform signals, such as a sine wave signal, a two-stage staircase signal, and the like. The modulation signal MGND is also not limited to a periodically changing signal, and may be a non-periodic changing signal.

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 1.8V. The grounding signal is 0V, and the driving signal is 1.8V. This is an example. The corresponding amplitude can be adjusted according to the product. The present invention does not limit this.

Specifically, the drive circuit 20 may further include a voltage generating circuit 27. The voltage generating circuit 27 is configured to generate the second reference signal. The modulation circuit 21 is connected to the device ground of the electronic device 100 and the voltage generating circuit 22, and receives a ground signal GND on the device ground and a second reference signal generated by the voltage generating circuit 22, corresponding to the modulation. Signal MGND. To distinguish the ground signal GND, the modulation signal is labeled MGND.

In the present embodiment, the drive circuit 20 achieves all signals of the synchronous modulation touch display panel 10 by providing the modulation signal MGND to a portion of the drive circuit 20. That is, as long as the signal on the portion of the ground is the modulation signal MGND, all the signals of the touch display panel 10 are synchronized to become the signals modulated by the modulation signal MGND.

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

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

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

It is to be noted that, in the present embodiment, in the first period W1, the common voltage generating circuit 22, the touch driving circuit 23, the data selecting circuit 24, and the control circuit 25 are located in the field 90, the modulation circuit 21 and voltage generating circuit 27 are located in said domain 80. A portion of the signal processing circuit 26 is located in the domain 80 and a portion is located in the domain 90.

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

The circuit in the field 90, for example, the common voltage generating circuit 22, the touch driving circuit 23, the data selecting circuit 24, the control circuit 25, and part of the signal processing circuit 26, if the ground terminal is included, the ground terminal Can be directly connected to the modulation ground.

In the second time period W2, the modulation circuit 21, the common voltage generating circuit 22, the touch driving circuit 23, the data selecting circuit 24, the control circuit 25, the signal processing circuit 26, and the voltage generating circuit 27 are all based on the ground signal GND. Benchmark.

Correspondingly, in the first time period W1, the modulation circuit 21 generates the modulation signal MGND according to the ground signal GND on the device ground and the driving signal from the voltage generating circuit 27, and provides the modulation signal MGND to the Modulated ground. The common voltage generating circuit 22 correspondingly generates the first common voltage Vc1 and selects by using the data The selection circuit 24 supplies the corresponding common electrode 101 with image display. The touch driving circuit 23 correspondingly generates the first common voltage Vc1, and provides image display and self-capacitance touch sensing to the corresponding common electrode 101 through the data selection circuit 24. The signal processing circuit 26 receives a touch sensing signal output from the touch driving circuit 23 to acquire touch information. That is, the first common voltage Vc1 outputted to the common electrode 101 by the touch driving circuit 23 is simultaneously used as a display driving signal and a touch driving signal, and the first common voltage Vc1 outputted by the common voltage generating circuit 22 to the common electrode 101 is used only. Display drive signal.

The first common voltage Vc1 outputted by the touch drive 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 drive circuit 23 can further transmit The touch sensing signal sensed from the common electrode 101 is supplied to the signal processing circuit 26 to acquire touch information, and thus, the driving circuit 20 can drive the touch display panel 10 while performing image display and self-capacitive touch sensing.

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

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

Preferably, in the second period W2, the data selection circuit 24 is controlled by the control circuit 25, and the second common voltage Vc2 on the plurality of common electrodes 101 is derived from the common voltage generating circuit 22. The touch drive circuit 23 may further output a second common voltage Vc2 to the data selection circuit 24, for example, but the data selection circuit 24 selectively outputs the second common voltage Vc2 from the common voltage generation circuit 22 to the common electrode 101, thereby The touch display device 1 performs image display instead of performing touch sensing in the second time period W2.

The touch display device 1 realizes image display and touch sensing by alternately performing the first time period W1 and the second time period W2.

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

The touch drive circuit 23 is different from the circuit configuration of the common voltage generating circuit 22, so that even if the touch drive circuit 23 and the common voltage generating circuit 22 provide the same signal to the common electrode 101, The common electrode 101 to which the touch driving circuit 23 is connected may further function as a touch sensing electrode.

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

Specifically, the common electrode 101 electrically connected to the touch drive circuit 23 may be responsive to a target object (eg, a finger The touch or proximity of the appropriate object is correspondingly outputted to the touch sensing driving circuit 23, and accordingly, the touch driving circuit 23 can obtain the touch information according to the touch sensing signal.

In contrast, the common voltage generating circuit 22 does not receive the signal from the common electrode 101, or even if the signal from the common electrode 101 is received, based on the circuit configuration of the common voltage generating circuit 22 itself, whether or not there is above the common electrode 101 When the target object is touched or approached, the signal output from the common electrode 101 electrically connected to the common voltage generating circuit 22 is substantially constant, so that the touch information cannot be acquired.

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

Since the touch driving circuit 23 supplies the same signal to the common electrode 101 as the common voltage generating circuit 22, the touch driving circuit 23 does not affect the execution while driving the common electrode 101 to perform self-capacitive touch sensing. The self-capacitive touch-sensing common electrode 101 performs normal image display. In addition, since the common voltage generating circuit 22 and the touch driving circuit 23 share the same signal source 221, the common voltage generating circuit 22 and the signal that the touch driving circuit 23 outputs to the plurality of common electrodes 101 The same or substantially the same can be achieved to ensure the quality of touch sensing and image display.

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

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

The follower 222 transmits a signal output from the signal source 221 to the data selection circuit 24, and is supplied to the corresponding common electrode 101 through the data selection circuit 24 to perform image display. The follower 222 is, for example, a first amplifier. However, the present invention is not limited thereto, and the follower 222 may be other suitable circuit structures, and is not limited to the first amplifier. In the specific embodiment, the follower 222 is taken as an example of the first amplifier. The first amplifier 222 includes a third power terminal c1, a third ground terminal d1, a first in-phase terminal e1, a first inverting terminal f1, and a first output terminal g1. The third power terminal c1 is used to load the power voltage VDD1. The third ground terminal d1 is used to connect the modulation ground. The first in-phase end e1 is for connecting to the output end b of the signal source 221. The first inverting terminal f1 is shorted to the first output end g1. The first output terminal g1 is connected to the data selection circuit 24.

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

In operation, in the first time period W1, the grounding terminal a and the third grounding terminal d1 receive the modulation signal MGND, and the signal source 221 correspondingly outputs the first reference voltage signal to the output terminal b. The first amplifier 222 is in a virtual short state, and correspondingly outputs a first common voltage Vc1 identical to the first reference voltage signal to the data selection circuit 24 through the data selection circuit 24 Image display is performed for the corresponding common electrode 101.

In the second time period W2, the ground terminal a and the third ground terminal d1 each receive a ground signal GND, and the signal source 221 correspondingly outputs a second reference voltage signal to the first amplifier 222 through the output terminal b, An amplifier 222 is in a virtual short state, and correspondingly transmits a second common voltage Vc2 identical to the second reference voltage signal to the data selection circuit 24, and is supplied to the plurality of common electrodes through the data selection circuit 24. 101 performs image display.

The touch drive circuit 23 includes, for example, the signal source 221 and a plurality of operational amplifiers 231. Each operational amplifier 231 includes a second amplifier 232 and a feedback branch 233. The second amplifier 232 includes a fourth power terminal c2, a fourth ground terminal d2, a second in-phase terminal e2, a second inverting terminal f2, and a second output terminal g2. The fourth power terminal c2 is used to load the power voltage VDD2. The fourth ground terminal d2 is used to connect the modulation ground. The second in-phase end e2 is for connecting to the output end b of the signal source 221. The second inverting terminal f2 is connected to the data selection circuit 24 and further connected to the second output terminal g2 through the feedback branch 233. The second output terminal g2 is further connected to the signal processing circuit 26.

The feedback branch 233 includes, for example, a feedback capacitor 233a and a reset switch 233b. Preferably, the feedback capacitor 233a and the reset switch 233b are connected in parallel between the second inverting terminal f2 and the second output terminal g2.

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

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

The number of the plurality of operational amplifiers 231 is, for example, the same as the number of columns of the plurality of common electrodes 101. Each operational amplifier 231 is selectively connectable to a column of common electrodes 101 via data selection circuit 24. However, the number of the plurality of operational amplifiers 231 may be the same as the number of rows of the plurality of common electrodes 101. In addition, the present invention is not limited thereto. For example, it is also possible that the common electrode 101 of each column can also be connected to the second operational amplifier 231 and the like.

The touch drive circuit 23 of the present invention provides the same same as the first common voltage Vc1 generated by the common voltage generating circuit 22. Touching the driving signal to the common electrode 101, whereby the touch driving signal can drive the common electrode 101 to perform both image display and self-capacitive touch sensing, and thus, the plurality of common electrodes 101 of the touch display device 1 are being executed At the same time as the image is displayed, touch sensing can be further performed.

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

However, in some modified embodiments, the touch drive circuit 23 and the common voltage generating circuit 22 may each select a circuit structure such as a signal source.

In a second time period W2, the modulation ground becomes a device ground, the signal source 221 outputs a second reference voltage signal to the follower 222 and the plurality of operational amplifiers 231, and the control circuit 25 controls the data selection circuit 24 to select Outputting a second common voltage Vc2 from the common voltage generating circuit 22 performs image display on the plurality of common electrodes 101.

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

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

For example, the plurality of common electrodes 101 are arranged in a matrix of 26 rows and 40 columns. Correspondingly, the number of the plurality of operational amplifiers 231 is 40, and the number of the second data selectors 242 is 40. . The first data selector 241 includes a first output port O1 for outputting a signal from the common voltage generating circuit 22 to the corresponding common electrode 101. The number of the first output ports O1 is the same as the number of rows of the plurality of common electrodes 101, that is, 26. Each of the second data selectors 242 includes a second output port O2 for outputting a signal from the touch drive 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 illustrated size, only part of the circuit structure is actually shown. For example, only two operational amplifiers 231, two second data selectors 242, and a portion of the common electrode 101 are shown. .

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

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

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

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

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

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

As described above, the touch display device 1 can also continue to perform both image display and touch sensing. For example, in time, the common voltage generating circuit 22 and the touch driving circuit 23 continuously provide the first A common voltage Vc1 is supplied to the common electrode 101, and the common voltage generating circuit 22 spatially drives the plurality of common electrodes 101 in cooperation with the touch driving circuit 23. In other words, without the second time period W2, the control circuit 25 correspondingly controls the first data selector 241 to always hold 26 select 25, and controls the plurality of second data selectors 242 to always keep 26 select 1.

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

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 The corresponding circuit information is inferred, so it will not be described here.

In addition, in some embodiments, the driving circuit 20 may further include, for example, a fingerprint driving circuit that selectively connects the plurality of common electrodes 101 when the driving circuit 20 is at the driving portion common electrode 101 When the touch sensing and image display are simultaneously performed, the fingerprint driving circuit can also drive the partial common electrode 101 to simultaneously perform fingerprint sensing and image display, and the common voltage generating circuit 22 drives the partial common electrode to perform image display. Therefore, in the present application, the operation of driving the common electrode 101 is not limited to the common voltage generating circuit 22 and the touch driving circuit 23, and may include other circuits of a suitable type or suitable function, and the corresponding driving common electrode 101 performs a corresponding function.

Please refer to FIG. 3 and FIG. 4 together. FIG. 4 is a schematic diagram showing the circuit structure of an embodiment of the modulation circuit 21. The modulation circuit 21 includes a first active switch 211, a second active switch 213, and a control unit 215. The first active switch 211 includes a control terminal K1, a first transmission terminal T1, and a second transmission terminal T2. The second active switch 213 includes a control terminal K2, a first transmission terminal T3, and a second transmission terminal T4. The control terminals K1, K2 are all connected to the control unit 215. The second transmission end T2 of the first active switch 211 is connected to the first transmission end T3 of the second active switch 213, and defines an output node N on the connection line, and the first transmission end T1 of the first active switch 211 Receiving the first reference signal, the second transmission end T4 of the second active switch 213 receives the second reference signal, and the control unit 215 controls the output correspondingly by controlling the first and second

active switches

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

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

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

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

It should be further noted that, in the first time period W1, the electronic device 100 has a reference 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, While the touch driving circuit 23 supplies the excitation signal to the common electrode 101, the touch sensing signal output from the common electrode 101 itself is further received to acquire touch information, and therefore, the touch driving circuit 23 drives the touch display. The principle when the panel 10 performs touch sensing is the self-capacitance touch sensing principle.

When the electronic device 100 employs two

domains

80, 90 with reference to GND and MGND, not only is the signal of the touch display panel 10 being synchronously modulated as a whole, but the signal-to-noise ratio is improved, and the touch drive circuit 23 is in the field 90. Some of the circuit structures are correspondingly simplified, which in turn simplifies the circuit structure and saves product costs. For example, touch The signal source 221 of the touch drive circuit 23 and the signal source 221a of the conventional touch drive circuit (see FIG. 5 below) will be described as an example.

Please refer to FIG. 5 and FIG. 6 together. FIG. 5 is a schematic diagram showing the circuit structure of the signal source 221a of the conventional touch driving circuit. FIG. 6 is a schematic diagram showing the circuit structure of the signal source 221 of the touch drive circuit 23. It should be noted in advance that when the existing touch driving circuit is in operation, the signal source 221a is based on the ground signal GND as a voltage reference. When the touch driving circuit 23 of the present application operates, the signal source 221 is based on the modulation signal MGND as a voltage reference. The signal source 221a includes a current source Ia, a resistor Ra, a first switch K1a, and a second switch K2a. The current source Ia and the resistor Ra are connected in series between the power supply terminal P1 and the device ground GND. One end of the first switch K1a is connected between the current source Ia and the resistor Ra, and the other end is connected to the non-inverting terminal h of the touch driving circuit. One end of the second switch K2a is connected between the first switch K1a and the non-inverting terminal h, and the other end is connected to the ground for loading the ground signal GND. By controlling the alternate conduction of the first switch K1a and the second switch K2a, a touch sensing driving signal is generated correspondingly to the non-inverting terminal h. Wherein, the power terminal P1 is kept constant with respect to the device ground GND.

In contrast, the signal source 221 includes a current source Ib and a resistor Rb connected in series between the power terminal P2 and the ground for loading the modulation signal MGND. The receiving end of the touch driving circuit 23, that is, the second non-inverting terminal g2, is connected between the current source Ib and the resistor Rb. Since the modulation signal MGND is varied, the output voltage between the power terminal P2, the current source Ib, and the resistor Rb varies with the modulation signal MGND on the modulation ground, thereby correspondingly generating a touch sensing drive. The signal is sent to the second non-inverting terminal g2. In addition, it is also possible to increase the capacitance between the modulation ground and the power supply terminal P2 to maintain the stability of the signal.

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

Please refer to FIG. 2, FIG. 3, and FIG. 7. FIG. 7 is a schematic structural diagram of a circuit of a specific implementation of the electronic device 100. As described above, in the embodiment, the touch display device 1 is described by taking a liquid crystal display device as an example. However, the circuit structure of the touch display device 1 may be different for all the different types of display devices, and the circuit configurations of different liquid crystal display devices may also be different. However, the structure that can be easily derived by a person of ordinary skill in the art should fall within the protection scope of the present application. In the present embodiment, the touch display panel 10 of the touch display device 1 includes a plurality of pixel dots 11. Each pixel 11 is driven by the drive circuit 20 for performing image display and touch sensing. Each of the pixel points 11 includes the common electrode 101, the pixel electrode 103, and the switching unit 104. In the present embodiment, the switch unit 104 includes a control switch 105. The control switch 105 includes a control electrode G, a first transfer electrode S, and a second transfer electrode D. The control electrode G and the first transfer electrode S are connected to the drive circuit 20. The second transfer electrode D is connected to the pixel electrode 103. The driving circuit 20 is configured to drive the control switch 105 to be turned on and off. In the present embodiment, the switch unit 104 includes a control switch 105. However, in other embodiments, the switch unit 104 may also include two control switches 105 or more, but may further include Other circuit components, such as memory circuits. The two control switches 105 For example, a series connection.

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

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

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

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

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

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

However, in other embodiments, the pixel point 11 performing image display refreshing may also select to simultaneously perform touch sensing under the driving of the driving circuit 20, or simultaneously perform image display refreshing of the pixel point 11 and performing touch The partially overlapped pixels 11 may also be selected to be partially overlapped, for example, a common electrode 101 is completely or partially shared between the pixel dots 11.

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

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

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

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

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

The plurality of scan lines 281 are configured to transmit the first scan enable signal Vg1, the second scan enable signal Vg3, the first scan cutoff signal Vg2, or the second scan cutoff signal Vg4 from the driving circuit 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 drive circuit 20 to the first transfer electrode S of the control switch 105.

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

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

Further, the signal on the pixel electrode 103 of the pixel point 11 held by the image display becomes a signal modulated by the modulation signal MGND by capacitive coupling. Therefore, the signals on the pixel electrode 103 and the common electrode 101 of each pixel 11 of the touch display panel 10 become signals that are synchronously modulated by the modulation signal MGND. Thus, the drive circuit 20 can simultaneously drive the common electrode 101 to perform touch sensing in any process of driving the touch display panel 10 to perform normal image display.

For example, when the scan driving circuit 28 supplies the first scan enable signal Vg1 to a scan line 281, the common voltage generating circuit 22 supplies the first common voltage Vc1 to perform image display to the partial common electrode 101, and the touch drive circuit 23 provides the first common voltage. Vc1 performs image display and self-capacitance touch sensing on the remaining common electrodes 101.

The touch display device 1 of the present application synchronizes all signals of the touch display panel 10 by using the modulation signal MGND, thereby making use for the touch display device of the Incell type that performs touch sensing compared to the existing multiplexing common electrode. 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 circuit 20 supplies the first scan enable signal Vg1 to the scan line 281, the self-capacitive touch feeling can also be performed on the common electrode 101. Accordingly, the touch display device 1 is not necessarily limited to driving the common electrode 101 to perform touch sensing in the line gap I and the frame gap, and thus, there is no time for performing touch sensing on the display device with improved display resolution. Not enough technical problems. In addition, the touch display device 1 performs touch sensing in any process of displaying an image, and has no influence or influence on normal display of the image.

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

In addition, in the second period W2, the scan signal generating circuit 28a outputs the second scan enable signal Vg3 and the second scan cutoff signal Vg4 to the scan driving circuit 28, and the scan driving circuit 28 is in the control circuit. The second scan enable signal Vg3 is outputted to the corresponding scan line 281, and the data drive circuit 29 outputs the second gray scale voltage Vd2 to the plurality of data lines 291. To activate the control switch 105 is supplied to the corresponding pixel electrode 103. The common voltage generating circuit 22 supplies a second common voltage Vc2 to the plurality of common electrodes 101. Thereby, the touch display panel 10 is driven to perform image display.

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

It should be noted that, in FIG. 7, only the modulation circuit 21 outputs the modulation signal MGND to the touch drive circuit 23, and the modulation circuit 21 outputs the modulation signal MGND to other circuits having the ground terminal in the field 90, such as a common voltage generation circuit. 22. Scanning signal generating circuit 28a and the like. However, those skilled in the art can clearly know from the above description that the modulating circuit 21 has an output modulated signal MGND to other circuits in the field 90 having a ground terminal.

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

Please refer to FIG. 8 and FIG. 9. FIG. 8 is an exploded perspective view of an embodiment of the touch display panel 10 of FIG. 7. FIG. 9 is a cross-sectional structural view of the touch display panel 10 of FIG. 8. The touch display panel 10 includes a first substrate 106, a second substrate 107, and a display medium layer 108. The display medium layer 108 is a liquid crystal layer in this embodiment, but may be modified, and in other embodiments, may correspond to other display media. The pixel electrode 103 of the plurality of pixel points 11 and the control switch 105, the plurality of scanning lines 281, and the plurality of data lines 291 are all disposed on the second substrate 107. The display medium layer 108 and the plurality of common electrodes 101 are disposed between the first substrate 106 and the second substrate 107.

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

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

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

Please refer to FIG. 10 and FIG. 11 together. FIG. 10 is a cross-sectional structural diagram of another embodiment of the touch display panel 10 of FIG. 7. FIG. 11 is a top plan view of the touch display panel 10 of FIG. The plurality of common electrodes 101 may also be disposed between the pixel electrode 103 and the second substrate 107. The plurality of common electrodes 101 and the plurality of pixel electrodes 103 are stacked one on another. A slit 103a is respectively disposed on the plurality of pixel electrodes 103 to form a fringe electric field with the common electrode 101. In this embodiment, the plurality of common electrodes 101 may not be provided with slits, each of which is a whole piece of electrodes. However, the plurality of common electrodes 101 may be provided with slits to improve the edges. Electric field strength.

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

Referring to FIG. 1 and FIG. 3 again, the electronic device 100 further includes a main control chip 3. The main control chip 3 is connected to the touch display device 1. The main control chip 3 is used for data communication with the touch display device 1. The main control chip 3 is further used to supply a power supply voltage to the touch display device 1. The main control chip 3 can be a single chip or a chipset. When the master chip 3 is a chipset, the chipset includes an application processor (AP) and a power chip. Additionally, the chipset may further include a memory chip. Further, the application processor may also be a central processing unit (CPU).

The main control chip 3 includes a power supply terminal 31 and a ground terminal 33. The power supply terminal 31 is connected to the driving circuit 20 for supplying power to the driving circuit 20. The ground terminal 33 is connected to the device ground and receives the ground signal GND of the device ground. In the first period W1 and the second period W2, the main control chip 3 is based on the ground signal GND as a voltage reference.

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

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

Referring to FIG. 3, FIG. 12 and FIG. 13, FIG. 12 is a structural block diagram of an embodiment of the signal processing circuit 26 shown in FIG. FIG. 13 is a schematic structural diagram of an embodiment of a signal processing unit 261 of the signal processing circuit 26 shown in FIG. The signal processing circuit 26 includes a plurality of signal processing units 261. Each of the signal processing units 261 is connected to an operational amplifier 231 for processing and calculating the sensing signals output from the operational amplifier 231 to obtain touch information.

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

It should be noted that the configuration of the signal processing circuit 26 is not limited to the configuration shown in FIG. 12. For example, the plurality of operational amplifiers 231 may share a signal processing unit 261 instead of each of the operational amplifiers 231. A signal processing unit 261 is connected.

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

For example, a level converting unit 264 may be further disposed between the calculating unit 265 and the analog-digital signal converting unit 263, and the level converting unit 264 is configured to output the analog-digital signal converting unit 263. The digital signal is level-converted and the level-converted digital signal is output to the computing unit 265. The calculation unit 265 calculates the obtained touch coordinates based on the level-converted digital signal. For another example, the calculation unit 265 exchanges a position with the level conversion unit 264, and accordingly, the analog-digital signal conversion unit 263 outputs the converted digital signal to the calculation unit 265. The calculation unit 265 calculates the obtained touch coordinates according to the digital signal, and outputs a signal indicating the touch coordinates to the level conversion unit 264, and the level conversion unit 264 performs level conversion on the signal indicating the touch coordinates. It is also possible to output to the main control chip 3, which is also determined according to the withstand voltage condition of the calculation unit 265 and the analog-digital signal conversion unit 263.

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

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

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

The drive circuit 204 can further include a display processing circuit 205. The display processing circuit 205 is connected between the main control chip 3 and the level conversion unit 264. The level converting unit 264 is further connected to the control circuit 25. The display processing circuit 205 is configured to perform corresponding processing (eg, storage, decompression, color adjustment, etc.) on the display data from the main control chip 3. The level converting unit 264 is disposed between the display processing circuit 205 and the control circuit 25 for level-converting the display data processed by the display processing circuit 205, and outputting the level-converted display data. The control circuit 25 is given. The control circuit 25 outputs corresponding display data and timing signals to the display driving circuit 20a. The display driving circuit 20a converts the received display data into a gray scale voltage, and outputs a first gray scale voltage Vd1 to the corresponding pixel electrode 103 to perform image display refresh in the first period W1 according to the timing signal, in the second period W2 outputs the second gray scale voltage Vd2 to perform image display refresh on the corresponding pixel electrode 103. The display data is preferably a digital signal.

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

Similarly, in the second time period W2, if the signal between the calculation unit 265 and the analog-digital signal conversion unit 263 does not need level conversion, the signal between the calculation unit 265 and the analog-digital signal conversion unit 263 may not Level shifting is performed, but in the first period W1, in the modulation scheme, since the voltage reference of the domain 80 and the domain 90 is different, level shifting is required.

Correspondingly, the level converting unit 264 can respectively control whether the corresponding signal is level-converted in the first period W1 and the second period W2 by setting the switching element. However, the switching element or other suitable circuit structure can also be disposed outside of the level shifting unit 264.

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

domains

80, 90 is: a part of the display drive circuit 20a, the touch drive circuit 23, and the signal processing circuit 26 (the operational amplifier 231) The analog-digital signal conversion unit 263, the data selection circuit 24, and the control circuit 25 are all divided in the domain 90 with reference to MGND. In addition, the touch display panel 10 is also divided in the field 90; the modulation circuit 21, the display The processing circuit 205, the calculation unit 265, the voltage generation circuit 27, and the slope controller 204 are all divided in a domain 80 based on GND; the level conversion unit 264 spans two domains, that is, a portion is in the domain 80, and a portion is in In the field 90, those skilled in the art can determine that the level conversion unit 264 is located in the domain 80 and the domain 90 respectively according to the description and circuit principle of the present application, and details are not described herein again.

Alternatively, the division of the drive circuit 20 in the two

domains

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

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

Since the signal of the touch display panel 10 when performing touch sensing is synchronously modulated by the modulation signal MGND as a whole, the driving circuit 20 supplies the display driving signal for performing image display to the common electrode 101, that is, a common voltage such as a second common voltage. Vc2, after being modulated by the modulation signal MGND, can be simultaneously applied to drive the common electrode 101 to perform touch sensing, thereby further driving the common electrode 101 to perform touch sensing while ensuring that the touch display panel 10 performs normal image display. It is also possible to improve the signal-to-noise ratio of the touch display device 1, thereby improving the touch sensing accuracy.

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

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

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

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

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

The protection circuit 15 is not limited to the above embodiments. For example, please refer to FIG. 16. FIG. 16 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. 15, the protection circuit shown in Fig. 16 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 be turned off, and the protection circuit 15a correspondingly disconnects the first power terminal 206 and the second power terminal 207. When the modulation signal MGND is the ground signal GND, the control unit 153 controls the third active switch 151 to be turned on, and the protection circuit 15a correspondingly closes the first power terminal 206 and the The connection between the second power terminals 207 is described. The third active switch 151 is a thin film transistor, a triode, or a metal oxide semiconductor field effect transistor.

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

Alternatively, in other embodiments, the modulation circuit 21 can also modulate all the signals of the touch display panel 10 by modulating the power supply or the reference power in the driving circuit 20, without limitation. Modulate the equipment ground. For example, the modulation terminal M of the modulation circuit 21 can be connected or used as the aforementioned first power terminal 206 (when modulating the power supply), in addition to being connectable or used as the aforementioned first ground terminal 201 (when modulating the ground) ). The modulation circuit 21 is connected between the first power terminal 206 and the second power terminal 207 when connected or used as the first power terminal 206. The first power terminal 206 is also referred to as a power supply terminal with respect to the first ground terminal 201, and the voltages applied by the two are kept constant.

In addition, in addition to the first power terminal 206 and the first ground terminal 201, the driving circuit 20 generally includes a reference power terminal (not shown), when the first power terminal 206 is used to load the first power voltage, When a ground terminal 201 is used to load a second power voltage, the reference power terminal is used to load a third power voltage, and the height of the third power voltage is between the first power voltage and the second power voltage. Meanwhile, the voltage difference between the first power voltage and the second power voltage is kept constant, and the voltage difference between the first power voltage and the third power voltage is kept constant. The reference power supply terminal can also be used or connected to the modulation terminal. That is, one of the power supply terminal, the reference power terminal, and the first ground terminal is used or connected. The modulation terminal, 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 circuit 20 supplies the second gray scale voltage Vd2 to the pixel electrode 103, provides the second common voltage Vc2 to the common electrode 101, and drives the Touching the display panel 10 to perform image display; in the first time period W1, the modulation terminal M loads a modulation signal, and the driving circuit 20 provides a first gray scale voltage Vd1 to the pixel electrode 103, provides a first common voltage Vc1 to the common electrode 101, and drives While the touch display panel 10 performs image display, the common electrode 101 is further driven to perform self-capacitance touch sensing.

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

Alternatively, in other embodiments, the common electrode 101 is used as a transmitting electrode, for example, the scanning line 281 is used as a receiving electrode, and the common electrode 101 and the scanning line 281 form a mutual capacitance, and the driving circuit 20 can also drive the touch display panel. 10 Perform mutual capacitance touch sensing.

In other embodiments, for the touch display device 1 and the electronic device 100 of the foregoing embodiments, the driving circuit 20 may use all of the touch display panel 10 to be synchronously modulated by modulation or modulation power supply or modulation reference power. In addition to the manner in which the touch display panel 10 is simultaneously driven to perform image display and touch sensing, alternatively, when the touch display device 1 simultaneously performs image display and touch sensing, non-modulated or non-modulated may also be employed. A non-modulation scheme such as a power supply or a non-modulation reference power source is driven, that is, the electronic device 100 operates in a domain 80 with a reference to the ground signal GND as a voltage reference.

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

Claims

A touch display device comprising:

Touching the display panel, comprising a plurality of pixel electrodes and a plurality of common electrodes, wherein the plurality of pixel electrodes and the plurality of common electrodes are used to form a fringe electric field; and

a driving circuit for driving the touch display panel to perform image display, and further for driving the common electrode to perform touch sensing; when the driving circuit drives the touch display panel while performing image display refreshing and touch sensing, The signals on the plurality of pixel electrodes are the first gray scale voltage, and the signals on the plurality of common electrodes are the same first common voltage, wherein the first gray scale voltage and the first common voltage are both A modulated signal modulated signal.
The touch display device according to claim 1, wherein the first gray scale voltage and the first common voltage both increase with an increase of the modulation signal, and the modulation signal decreases. reduce.
The touch display device according to claim 1, wherein the first gray scale voltage and the first common voltage are signals that are synchronously modulated by the modulation signal.
The touch display device according to claim 1, wherein the driving circuit is configured to provide the same first common voltage to perform image display to the plurality of common electrodes, and is also used for time-sharing or simultaneous reception. The plurality of common electrodes output touch sensing signals to acquire touch information.
The touch display device according to claim 1, wherein when the driving circuit supplies the first gray scale voltage to a portion of the pixel electrodes, providing the same first common voltage to the plurality of common electrodes, the driving station When the touch display panel simultaneously performs image display refresh and touch sensing, the remaining signals on the pixel electrodes in the floating state are superimposed with the modulation signal by capacitive coupling.
The touch display device according to claim 1, wherein the plurality of pixel electrodes are located in a same layer, the plurality of common electrodes are located in a same layer, and between the plurality of pixel electrodes and the plurality of common electrodes The stacked arrangement, wherein the number of the plurality of common electrodes is smaller than the number of the plurality of pixel electrodes.
The touch display device according to claim 6, wherein when the driving circuit drives the touch display panel while performing image display refresh and touch sensing, performing pixel display refreshing of the pixel electrode and performing touch sensing The common electrodes do not overlap each other.
The touch display device according to claim 1, wherein the touch display panel further comprises:

Multiple scan lines;

Multiple data lines;

a plurality of transistor switches, each transistor switch comprising a control electrode, a first transfer electrode, and a second transfer electrode, wherein the control electrode is connected to the scan line, the first transfer electrode is connected to the data line, and the second transfer electrode is connected to the pixel electrode ;

When the driving circuit drives the touch display panel while performing image display and touch sensing, signals on the plurality of scan lines are signals modulated by the modulation signal.
The touch display device according to claim 8, wherein the driving circuit is configured to provide a first scan on Transmitting a signal to the scan line, activating a transistor switch connected to the scan line, providing a first gray scale voltage to the plurality of data lines, and transmitting the same to the corresponding pixel electrode through the activated transistor switch to provide the same first common A voltage is applied to the plurality of common electrodes, and a touch sensing signal from the common electrode output is received to drive the touch display panel while performing image display refresh and self-capacitive touch sensing.
The touch display device according to any one of claims 1 to 9, wherein the driving circuit comprises a modulation circuit, a first ground terminal, and a second ground terminal, and the modulation circuit is connected to the first Between the ground terminal and the second ground terminal, the second ground terminal is configured to receive a ground signal, and the modulation circuit is configured to generate the modulation signal according to the ground signal and a driving signal, and output the modulation The signal is applied to the first ground end. When the signal of the first ground end is the modulation signal, the signals on the touch display panel are signals modulated by the modulation signal.
The touch display device according to claim 10, wherein when the signal of the first ground terminal is the modulation signal, the signal on the touch display panel or the signal from the output of the driving circuit, or Capacitive coupling superimposes the modulated signal.
The touch display device according to claim 10, wherein the driving circuit further comprises a common voltage generating circuit, a touch driving circuit, and a data selecting circuit, wherein the data selecting circuit and the plurality of common electrodes are respectively Connected, the common voltage generating circuit is selectively connectable to the plurality of common electrodes through the data selection circuit, and the touch driving circuit is selectively connectable to the plurality of common electrodes through the data selection circuit, The common voltage generating circuit is configured to perform image display by the data selection circuit to provide the first common voltage to the common electrode, and the touch driving circuit is configured to provide the first common voltage to the common electrode through the data selection circuit Image display and touch sensing are performed simultaneously.
The touch display device according to claim 12, wherein the driving circuit further comprises a control circuit, the control circuit is connected to the data selection circuit, and the control circuit controls the data selection circuit by corresponding control a number of connections of the common voltage generating circuit and the plurality of common electrodes, and a number of connections between the touch driving circuit and the plurality of common electrodes.
The touch display device according to claim 13, wherein the control circuit, the common voltage generating circuit, the touch driving circuit, and the data selecting circuit are both connected to the first ground.
The touch display device according to claim 12, wherein said common voltage is provided when said touch driving circuit supplies said first common voltage to said common electrode through said data selection circuit while performing image display and touch sensing The generating circuit provides a first common voltage to perform image display for all or part of the common electrode.
The touch display device according to claim 12, wherein said data selection circuit comprises a first data selector and a plurality of second data selectors, wherein said common voltage generating circuit selects said first data The device is selectively connectable to the plurality of common electrodes, the touch drive circuit is selectively connectable to the plurality of common electrodes by the plurality of second data selectors, and each of the second data selectors is used for connecting portions Common electrode.
The touch display device according to claim 16, wherein said first data selector comprises a plurality of first An output port, each of the second data selectors includes a plurality of second output ports, each of the second output ports is respectively connected to a common electrode, and each of the first output ports of the first data selector is connected to the second output port Between the common electrode and the common electrode.
The touch display device according to claim 17, wherein the plurality of first output ports of the first data selector are connected in one-to-one correspondence with the plurality of second output ports of each second data selector, or a plurality of first output ports of the first data selector are connected to a portion of the second output port of the second data selector, or a plurality of first output ports and a second portion of the first data selector The plurality of second output ports of the data selector are connected one by one.
The touch display device according to claim 16, wherein the plurality of common electrodes are arranged in a plurality of rows and columns, and the plurality of second output ports of a second data selector are respectively connected to the same column or the same row. Common electrode.
The touch display device according to claim 16, wherein the plurality of common electrodes are arranged in a plurality of rows and columns, the number of the plurality of second data selectors and the number of columns of the plurality of common electrodes Similarly, the plurality of second output ports of each second data selector are the same as the number of rows of the plurality of common electrodes, and the plurality of second output ports of each second data selector are respectively corresponding to a column of common electrodes. Connecting, or, the number of the plurality of second data selectors is the same as the number of rows of the plurality of common electrodes, and the plurality of second output ports of each second data selector and the plurality of common electrode columns The plurality of second output ports of each second data selector are respectively connected in one-to-one correspondence with one row of common electrodes.
The touch display device according to claim 12, wherein the common voltage generating circuit comprises:

a signal source comprising a ground end and an output end, the ground end being connected to the first ground end; and

a follower connected to the first ground, the follower being selectively connectable to the plurality of common electrodes by the data selection circuit, the follower for transmitting a signal output by the signal source The data selection circuit.
The touch display device according to claim 21, wherein the touch driving circuit comprises:

The signal source; and

a plurality of operational amplifiers each connected to the first ground terminal, each operational amplifier being selectively connectable to a portion of the common electrode through the data selection circuit, the operational amplifier for transmitting the output signal of the signal source A circuit is selected for the data, and a touch sensing signal from the common electrode is transmitted.
The touch display device according to claim 22, wherein the common voltage generating circuit further comprises a voltage stabilizing circuit connected between the follower and the first ground, and the voltage stabilizing circuit is used for The signal output from the follower is regulated.
The touch display device according to claim 22, wherein the follower comprises a first amplifier, and the first amplifier comprises a third power terminal, a third ground terminal, a first in-phase terminal, and a first a phase end, and a first output end, wherein the third power terminal is used to load a power voltage, the third ground terminal is connected to the first ground terminal, and the first in-phase terminal is connected to the signal source The first inverting end is connected to the first output end, and the first output end is configured to be selectively connectable to the plurality of common electrodes through a data selection circuit.
The touch display device according to claim 24, wherein each of the operational amplifiers comprises a second amplifier and a feedback branch; and the second amplifier comprises a fourth power terminal, a fourth ground terminal, a second non-inverting terminal, and a second Second inverting end, and a second output terminal, wherein the fourth power terminal is used to load a power voltage, the fourth ground terminal is connected to the first ground terminal, and the second in-phase terminal is connected to an output end of the signal source, The second inverting terminal is coupled to the second output through a feedback branch, and the second inverting terminal is further selectively connectable to a portion of the common electrode through a data selection circuit.
The touch display device according to claim 25, wherein when the modulation circuit outputs the modulation signal to the first ground terminal, the signal source correspondingly outputs a first modulation modulated by the modulation signal a reference voltage signal to the first non-inverting terminal and the second non-inverting terminal, the operational amplifier and the follower correspondingly outputting, by the data selection circuit, a same first common voltage as the first reference voltage signal to the plurality of A common electrode to drive the touch display panel while performing image display and touch sensing.
The touch display device according to claim 25, wherein the driving circuit further comprises a signal processing circuit, wherein the signal processing circuit is connected to the second output terminal for receiving a touch sensing signal output by the common electrode, To get touch information.
A touch display device according to claim 21, wherein said signal source is a direct current source.
The touch display device according to claim 1, wherein the driving circuit is configured to drive the plurality of common electrodes to perform self-capacitive touch sensing.
A touch display device according to claim 1, wherein said first common voltage remains unchanged with respect to said modulated signal.
The touch display device according to claim 1, wherein the driving circuit is configured to provide the same first common voltage to the plurality of common electrodes when the image display refresh is performed by driving the touch display panel, Driving the plurality of common electrodes to perform image display and further driving the common electrode to perform touch sensing.
A touch display device according to claim 10, wherein said driving circuit further comprises a voltage generating circuit for generating said driving signal, said second ground terminal for connecting a device ground Receiving a ground signal from a device ground, the modulation circuit generating the modulation signal according to the driving signal and the ground signal.
An electronic device comprising the touch display device of any of claims 1-32.