Touch display device and electronic device

Abstract

The present invention provides a touch display device and an electronic device. The touch display device includes a touch display panel and a driving circuit. The touch display panel includes a first substrate and a second substrate arranged opposite to each other; a display medium layer located between the first substrate and the second substrate; and a plurality of first electrodes located between the second substrate and the display medium layer for image display and touch sensing. The driving circuit is used to provide grayscale voltages to the plurality of first electrodes for image display, and is also used to provide touch sensing driving signals to the plurality of first electrodes for self-capacitance touch sensing.

Description

Technical Field

[0001] The present invention relates to the field of touch display technology, and in particular to a touch display device and an electronic device having the touch display device. Background Art

[0002] At present, touch screens have been gradually applied to various electronic products, becoming an important intermediate interface device for users to interact with electronic products. However, existing electronic products are usually equipped with an additional touch screen, which is not conducive to the development of electronic products towards lightness and thinness. Summary of the invention

[0003] The problem solved by the present invention is to provide a lighter and thinner touch display device and electronic equipment.

[0004] Accordingly, the present invention provides a touch display device, comprising:

[0005] Touch display panel, including:

[0006] A first substrate and a second substrate are arranged opposite to each other;

[0007] A display medium layer is located between the first substrate and the second substrate; and

[0008] A plurality of first electrodes are located between the second substrate and the display medium layer for image display and touch sensing; and

[0009] The driving circuit is used to provide grayscale voltages to the plurality of first electrodes to perform image display, and is also used to provide touch sensing driving signals to the plurality of first electrodes to perform self-capacitive touch sensing.

[0010] Optionally, the touch display panel further comprises:

[0011] A second electrode is located between the first substrate and the second substrate;

[0012] The driving circuit is used for providing a common voltage to the second electrode, so as to cooperate with the first electrode to drive the touch display panel to display an image.

[0013] Optionally, the plurality of first electrodes are located in a same layer, and the second electrode is stacked with the plurality of first electrodes.

[0014] Optionally, the side of the first substrate facing away from the second substrate is used to receive touch or proximity input of a target object, the second electrode is arranged between the multiple first electrodes and the display medium layer, the multiple first electrodes are located between the second electrode and the second substrate, and a hollow structure is arranged on the second electrode.

[0015] Optionally, the area of ​​the region between adjacent hollow structures on the second electrode corresponding to the same first electrode is less than or equal to the area of ​​the hollow structure, and the edge of the region between adjacent hollow structures does not exceed the edge of the hollow structure.

[0016] Optionally, a plurality of hollow structures corresponding to the same first electrode are arranged along the first direction, and along the first direction, a width of a region between adjacent hollow structures is less than or equal to a width of a hollow structure.

[0017] Optionally, the second electrode is arranged between the plurality of first electrodes and the second substrate, the plurality of first electrodes are arranged between the display medium layer and the second electrode, and a hollow structure is arranged on the plurality of first electrodes.

[0018] Optionally, the area of ​​the region between adjacent hollow structures on the same first electrode is greater than or equal to the area of ​​the hollow structure, and the edge of the region between the adjacent hollow structures does not exceed the edge of the hollow structure.

[0019] Optionally, a plurality of hollow structures on the same first electrode are arranged along a first direction, and along the first direction, a width of a region between adjacent hollow structures is greater than or equal to a width of a hollow structure.

[0020] Optionally, the touch display panel is further provided on the second substrate:

[0021] Multiple scan lines;

[0022] a plurality of data lines, insulated and cross-arranged with the plurality of scanning lines; and

[0023] A plurality of control switches, each control switch comprises a control electrode, a first transmission electrode, and a second transmission electrode, wherein the control electrode is connected to the scan line, the first transmission electrode is connected to the data line, and the second transmission electrode is connected to the first electrode.

[0024] The control electrode is used to control whether the first transmission electrode and the second transmission electrode are turned on or off according to the signal transmitted on the scan line.

[0025] Optionally, the driving circuit includes:

[0026] a touch drive circuit, configured to provide a touch sensing control signal to the scan line, activate a control switch connected to the scan line, and output a touch sensing drive signal to the first electrode through the data line and the activated control switch to perform self-capacitive touch sensing; and

[0027] The display driving circuit is used to provide a scanning signal to the scanning line, activate a control switch connected to the scanning line, and output a grayscale voltage to the first electrode through the data line and the activated control switch to perform image display.

[0028] Optionally, the touch display device time-division multiplexes the plurality of scan lines, the plurality of data lines, the plurality of control switches, and the plurality of first electrodes to perform image display refresh and self-capacitive touch sensing.

[0029] Optionally, the driving circuit further includes a control circuit for controlling the touch driving circuit and the display driving circuit to work in time sharing.

[0030] Optionally, an area of ​​the touch display panel used to display images and receive touch or proximity input from a target object is defined as a touch display area, and the touch display panel further includes a first shielding electrode, which is located between the first substrate and the second substrate, and the first shielding electrode partially or completely covers the data line located in the touch display area.

[0031] Optionally, the driving circuit is connected to the first shielding electrode, and when the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the first shielding electrode and the touch drive sensing signal remains unchanged.

[0032] Optionally, the first shielding electrode is the common electrode.

[0033] Optionally, the touch display panel further includes a second shielding electrode, wherein the second shielding electrode is located between the first substrate and the second substrate, and the second shielding electrode partially or completely covers the control switch located in the touch display area.

[0034] Optionally, the driving circuit is connected to the second shielding electrode, and when the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the second shielding electrode and the touch drive sensing signal remains unchanged.

[0035] Optionally, the second shielding electrode is the common electrode.

[0036] Optionally, the touch display panel further includes a fourth shielding electrode, wherein the fourth shielding electrode is located between the first substrate and the second substrate, and the fourth shielding electrode partially or completely covers the scan line located in the touch display area.

[0037] Optionally, the driving circuit is connected to the fourth shielding electrode, and when the first electrode performs touch sensing, the voltage difference between the voltage signal provided by the driving circuit to the fourth shielding electrode and the touch drive sensing signal remains unchanged, and the voltage difference between the touch sensing control signal and the touch sensing drive signal remains unchanged.

[0038] Optionally, the fourth shielding electrode is the common electrode.

[0039] Optionally, an area on the second substrate located around the touch display area is defined as an edge area, and the touch display panel is further disposed in the edge area:

[0040] a plurality of first connection lines, used to connect the plurality of data lines to the driving circuit; and

[0041] A third shielding electrode, the plurality of connection lines are arranged between the second substrate and the third shielding electrode, and the third shielding electrode partially or completely covers the plurality of connection lines.

[0042] Optionally, the driving circuit is connected to the third shielding electrode, and when the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the third shielding electrode and the touch drive sensing signal remains unchanged.

[0043] Optionally, the plurality of connection lines are made of the same material as the control electrode, and the third shielding electrode is made of the same material as the first transmission electrode or the first electrode or the second electrode.

[0044] Optionally, the common voltage provided by the driving circuit to the second electrode when driving the first electrode to perform image display refresh is different from the common voltage provided to the second electrode when driving the first electrode to perform touch sensing.

[0045] Optionally, when the driving circuit drives the first electrode to perform touch sensing, the common voltage provided to the second electrode is a variable voltage, and a voltage difference between the common voltage and the touch sensing driving signal remains unchanged.

[0046] Optionally, the common voltage provided by the driving circuit to the second electrode when driving the first electrode to perform image display refresh is a constant voltage.

[0047] Optionally, the driving circuit includes a modulation circuit, which is used to generate a modulation signal, and the modulation signal is used to modulate the input signal provided to the touch display panel by the driving circuit when driving the first electrode to perform touch sensing, and the input signal includes the touch sensing drive signal.

[0048] Optionally, the touch sensing drive signal increases as the modulation signal increases, and decreases as the modulation signal decreases.

[0049] Optionally, the modulated signal includes a first reference signal and a second reference signal different from the first reference signal, wherein the voltages of the first reference signal and the second reference signal may be any one of the following five situations:

[0050] First: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;

[0051] Second: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is a negative voltage;

[0052] Third: the voltage of the first reference signal is a positive voltage, the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal;

[0053] Fourth: the voltages of the first reference signal and the second reference signal are positive voltages of different magnitudes;

[0054] Fifth: the voltages of the first reference signal and the second reference signal are negative voltages of different magnitudes.

[0055] Optionally, the modulation circuit is used to be connected between the touch display panel and one end of an electronic device, and the modulation circuit is used to receive a first reference signal from the electronic device. The driving circuit further includes a voltage generating circuit, which is connected to the modulation circuit and is used to provide a second reference signal to the modulation circuit.

[0056] Optionally, one end of the modulation circuit used to connect the electronic device is the device ground, and receives a ground signal output from the device ground, and the first reference signal is a ground signal; or, one end of the modulation circuit used to connect the electronic device is the power supply terminal, and receives a power supply voltage output from the power supply terminal, and the first reference signal is the power supply voltage; or, one end of the modulation circuit used to connect the electronic device is the reference power supply terminal, and receives a reference power supply voltage output from the reference power supply terminal, and the first reference signal is the reference power supply voltage.

[0057] Optionally, the power supply voltage is higher than the ground signal, and the voltage difference between the two remains unchanged; the reference power supply voltage is between the ground signal and the power supply voltage, and the voltage difference between the reference power supply voltage and the ground signal remains unchanged.

[0058] Optionally, the driving circuit further includes a first ground terminal; the first ground terminal is connected to a device ground of an electronic device through the modulation circuit, and when the first electrode performs touch sensing, the modulation circuit outputs a modulation signal to the first ground terminal; when the first electrode performs image display refresh, the modulation circuit outputs a ground signal from the device ground to the first ground terminal.

[0059] Optionally, the driving circuit further includes a common voltage generating circuit, which includes a first circuit and a second circuit; the ground end of the first circuit is connected between the first ground end and the modulation circuit, for receiving the ground signal of the device ground; the ground end of the second circuit is connected between the modulation circuit and the first ground end, for receiving the modulation signal; wherein, when the first electrode performs image display refresh, the first circuit is electrically connected to the second electrode, and provides a common voltage to the second electrode; when the first electrode performs touch sensing, the second circuit is electrically connected to the second electrode, and provides another common voltage different from the common voltage provided by the first circuit to the second electrode.

[0060] Optionally, the plurality of first electrodes are pixel electrodes, the second electrode is a common electrode, and the display medium layer is a liquid crystal layer.

[0061] Optionally, a side of the first substrate facing away from the second substrate is used to receive a touch or proximity input of a target object.

[0062] The present invention also provides an electronic device, comprising a main control chip and a touch display device, wherein the main control chip is used to supply power to the touch display device and to communicate data with the touch display device, wherein the touch display device is any one of the touch display devices described above.

[0063] Since the first electrode of the touch display device is used to perform image display refresh and touch sensing, the touch display device becomes lighter and thinner. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of an embodiment of an electronic device of the present invention.

[0065] Figure 2 for Figure 1 A schematic diagram of an embodiment of a touch display device is shown.

[0066] Figure 3 FIG. 4 is a schematic diagram of a circuit structure of another embodiment of a touch display device of the present invention.

[0067] Figure 4 It is a structural schematic diagram of another implementation of a touch display panel.

[0068] Figure 5 for Figure 4 A partially enlarged plan view of the second electrode and the first electrode is shown.

[0069] Figure 6 for Figure 4 A partial cross-sectional structural schematic diagram of another embodiment of a touch display panel is shown.

[0070] Figure 7 for Figure 6 A partially enlarged plan view of the second electrode and the first electrode is shown.

[0071] Figure 8 for Figure 4 The schematic diagram of the structure of the touch display panel after assembly is shown.

[0072] Fig. 9 for Figure 3 The structural diagram of the touch sensing detection circuit shown is shown.

[0073] Fig.10 for Fig. 9 A schematic structural diagram of an implementation of a touch sensing detection unit and a processing unit is shown.

[0074] Fig.11 FIG. 1 is a schematic diagram of a partial circuit structure of an embodiment of a touch display device.

[0075] Fig.12 FIG. 4 is a schematic diagram of a partial circuit structure of another embodiment of a touch display device.

[0076] Fig.13 It is a schematic structural diagram of another embodiment of the electronic device of the present invention.

[0077] Fig.14 for Fig.13 A schematic diagram of an embodiment of a modulation circuit is shown.

[0078] Fig.15 A schematic diagram of the circuit structure of an embodiment of the second signal processing circuit when the electronic device only uses one domain based on GND.

[0079] Fig.16 A schematic diagram of the circuit structure of an embodiment of the second signal processing circuit when the electronic device adopts two domains based on GND and MGND.

[0080] Fig.17 This is a circuit diagram for the protection circuit.

[0081] Fig.18 A schematic structural diagram of another embodiment of a protection circuit.

[0082] Fig.19 It is a structural schematic diagram of another implementation of a self-capacitive touch screen.

[0083] Fig. 20 It is a structural schematic diagram of a common voltage generating circuit.

[0084] Fig.21 is a diagram showing the connection relationship between the second circuit and the second electrode.

[0085] Fig. 22 for Fig.13 Schematic diagram of the display driving circuit shown.

[0086] Fig.23 It is a partial structural schematic diagram of another embodiment of the electronic device of the present invention. DETAILED DESCRIPTION

[0087] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and the concept of the exemplary embodiments will be fully conveyed to the technicians in the field. For convenience or clarity, the thickness and size of each layer shown in the drawings may be exaggerated, omitted or schematically shown, and the number of related elements may be schematically shown. In addition, the size of the element does not fully reflect the actual size, and the number of related elements does not fully reflect the actual number. Due to reasons such as different sizes of the drawings, there are inconsistencies in the number of the same or similar or related elements shown in different drawings. The same reference numerals in the drawings represent the same or similar structures. However, it should be noted that in order to make the labels regular and logical, in some different embodiments, the same or similar elements or structures use different reference numerals, and according to the relevance of the technology and the relevant text description, the technicians in the field can directly or indirectly judge and know.

[0088] In addition, the described features and structures may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that, without one or more of the specific details, or by adopting other structures, components, etc., technical solutions of the present invention may also be put into practice. In other cases, known structures or operations are not shown or described in detail to avoid blurring the present invention.

[0089] 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 applicable to technologies, methods, physical elements, and systems (whether currently known or not), including extensions thereof that are inferred or inferred by those skilled in the art after reading this application.

[0090] In the description of the present invention, it should be understood that: "multiple" includes two and more than two, and "multiple" includes two and more than two, unless otherwise clearly and specifically defined in the present invention. "At least two" includes two, three, four, five, and other situations, and "at least two" includes two, three, four, five, and other situations. In addition, the words "first", "second", etc. that appear in the names of various components and signal names do not limit the order in which the components or signals appear, but are for the convenience of component naming, to clearly distinguish the components, and to make the description more concise.

[0091] Touch screens generally include resistive, capacitive, infrared and other types of touch screens, among which capacitive touch screens are more widely used. Capacitive touch screens include mutual capacitive touch screens and self-capacitive touch screens.

[0092] In a mutual capacitance based touch system, a touch screen may include, for example, a drive region and a sensing region, such as drive lines and sense lines. In an example case, the drive lines may form multiple rows, and the sense lines may form multiple columns (e.g., orthogonal). Touch pixels may be disposed at the intersections of the rows and columns. During operation, the rows may be stimulated with an alternating current (AC) waveform, and mutual capacitance may be formed between the rows and columns of the touch pixels. When an object approaches the touch pixel, some of the charge coupled between the rows and columns of the touch pixel may be coupled to the object instead. This reduction in charge coupled to the touch pixel may result in a net reduction in mutual capacitance between the rows and columns and a reduction in the AC waveform coupled to the touch pixel. This reduction in the charge coupled AC waveform may be detected and measured by the touch system to determine the position of the object when it touches the touch screen.

[0093] In contrast, in a touch system based on self-capacitance, each touch pixel may be formed by a separate 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 capacitance to ground may result in a net increase in the self-capacitance experienced by the touch pixel. This increase in self-capacitance may be detected and measured by the touch system to determine the position of the object when it touches the touch screen.

[0094] In order to avoid confusion, the following further explanations are needed:

[0095] First, for the first electrode in the touch display panel of the present invention, functionally, the first electrode can be used as both a pixel electrode for image display and a sensing electrode for touch sensing. For the technical solution of the modulation ground, the first electrode can also be a common electrode, which will be described in the following related embodiments of the modulation ground. In addition, the first electrode is not limited to a pixel electrode or a common electrode, and can also be an electrode with other names but the same or similar functions.

[0096] Second, taking the first electrode as a pixel electrode as an example, for a single pixel electrode, there are two main working states, namely, a touch sensing state and an image display state. Among them, the image display state is further subdivided into two main display states, namely, an image display refresh state and an image display hold state. The image display state starts from the image display refresh state, and after the image display refresh is completed, it enters the image display hold state until it enters the touch sensing state.

[0097] For example, after a first electrode performs touch sensing, a grayscale voltage is provided to the first electrode to perform image display refresh. After the grayscale voltage is written to the first electrode, the image display refresh is completed, and accordingly, the grayscale voltage is stopped from being provided to the first electrode. Afterwards, the first electrode enters an image display holding state until the first electrode performs touch sensing next time. In addition, the image display refresh may further include pre-charging or pre-discharging the first electrode, and providing a grayscale voltage to realize a predetermined grayscale image to the first electrode after the first electrodes in the same row reach the same voltage.

[0098] Here, the two different display states of image display refresh and image display hold are pointed out to prepare for a better understanding of the various embodiments of the present invention described below. In addition, it is further clarified that "image display refresh" and "image display hold" are two different technical concepts.

[0099] Accordingly, in some embodiments, when any two first electrodes in the touch display panel are required to perform image display refresh and touch sensing non-simultaneously, there is a situation where the two first electrodes perform image display retention and touch sensing simultaneously.

[0100] Third, the entire touch display device includes three main working states, namely, a touch sensing state, an image display refresh state, and a field blanking period.

[0101] Next, various embodiments of the present invention are described.

[0102] See also Figure 1 , Figure 1Schematic diagram of an embodiment of an electronic device of the present invention. The electronic device 100 is various suitable products such as a mobile phone, a tablet computer, a laptop computer, a desktop computer, a wearable device, and a smart home. The present invention is not limited to this. The electronic device 100 includes a touch display device 1. The touch display device 1 is used to realize image display and touch sensing. The display device in the touch display device 1 is, for example, a liquid crystal display device, that is, the touch display device is a touch liquid crystal display device. The following mainly describes the touch liquid crystal display device as an example. However, it can be changed that the display device in the touch display device 1 can also be other suitable types of display devices, such as an electronic paper display device (EPD) and the like.

[0103] Please also read Figure 2 , Figure 2 for Figure 1 The schematic diagram of an embodiment of a touch display device 1 is shown. The touch display device 1 comprises a touch display panel 10 and a driving circuit 20. The driving circuit 20 is connected to the touch display panel 10 and is used to drive the touch display panel 10 to perform image display and self-capacitive touch sensing.

[0104] The touch display panel 10 includes a plurality of display electrodes 11, the plurality of display electrodes 11 are used to perform image display, and at least some of the plurality of display electrodes 11 are further used to perform self-capacitive touch sensing. The display electrodes 11 used for both performing image display and performing self-capacitive touch sensing are defined as first electrodes 101. The driving circuit 20 is used to provide a touch sensing driving signal to the first electrode 101 to perform self-capacitive touch sensing, and is also used to provide a grayscale voltage to the display electrode 11 to perform image display.

[0105] Since the first electrodes 101 of the touch display panel 10 are used for both image display and self-capacitive touch sensing, the touch display device 1 is thinner and lighter.

[0106] In this embodiment, the plurality of display electrodes 11 are arranged in a two-dimensional array. The plurality of display electrodes 11 are in the same layer and on the same plane. However, in other embodiments, the plurality of display electrodes 11 may be arranged in other regular or irregular manners. The plurality of display electrodes 11 are in the same layer or on the same plane.

[0107] One operation mode is that all display electrodes 11 are used for both image display and self-capacitive touch sensing. However, it is also feasible that some display electrodes 11, for example, the first and last two rows or one of the display electrodes 11, are only used for image display or touch sensing. Figure 2Taking the display electrode 11 shown as an example, the display electrode 11 located outside the dotted frame area is the first electrode 101, and the display electrode 11 located within the dotted frame area (the display electrode 11 in the last row on the touch display panel 10) is always performing image display regardless of whether the first electrode 101 is performing image display or touch sensing.

[0108] It should be understood that the above is for the purpose of clarity. Figure 2 It is shown that part of the display electrodes 11 are used as the first electrode 101, but all the display electrodes 11 in the touch display device 1 described below in this application document are used for both image display and self-capacitive touch sensing. Accordingly, in the description of each embodiment below, all the display electrodes 11 are used as the first electrode 101 as an example for description and illustration, but for a person skilled in the art, based on the various embodiments described below in this application document, it is easy to think of other embodiments in which not all the display electrodes 11 are used as the first electrode 101. For the sake of clarity and simplicity, other related embodiments will not be described in detail, but they should all fall within the scope of protection of this application. In addition, the above situation also applies to the touch display device 4 of the electronic device 400 and the touch display device of the electronic device 900 described later.

[0109] In this embodiment, the touch display device 1 is described by taking a touch liquid crystal display device as an example, and accordingly, the display electrode 11 is a pixel electrode. The shape of the first electrode 101 is approximately rectangular (eg Figure 2 The length L of each first electrode 101 is generally in the range of 20 micrometers to 300 micrometers, and the width W is generally in the range of 10 micrometers to 150 micrometers. It should be noted that the shape of the first electrode 101 is generally not a regular rectangle. In addition, the length L and width W of the first electrode 101 are not limited to the aforementioned general ranges.

[0110] The driving circuit 20 drives one of the two first electrodes 101 to perform self-capacitive touch sensing and the other first electrode 101 to perform image display refresh non-simultaneously. Accordingly, to achieve the aforementioned driving mode, in one embodiment, the driving circuit 20 provides the touch sensing driving signal and the grayscale voltage to the touch display panel 10 non-simultaneously. However, it can be changed that in other embodiments, the driving circuit 20 can also provide the touch sensing driving signal and the grayscale voltage to the touch display panel 10 simultaneously, but the purpose of controlling the non-simultaneous driving of one of the two first electrodes 101 to perform self-capacitive touch sensing and the other first electrode 101 to perform image display refresh is achieved by controlling the output of the driving circuit 20 itself. Because with the development of circuit technology and touch display panel 10 technology, more and more circuits can be formed in the touch display panel 10, therefore, the driving circuit 20 may output the touch sensing driving signal and the grayscale voltage to the touch display panel 10 simultaneously, but it is also possible that it is not output to the first electrode 101 at the same time.

[0111] See also Figure 3 , Figure 3 Schematic diagram of the circuit structure of another embodiment of the touch display device 1 of the present invention. The touch display panel 10 further includes a plurality of scan lines 102, a plurality of data lines 103, a plurality of control switches 104, and a second electrode 105. The plurality of scan lines 102 and the plurality of data lines 103 are insulated and cross-arranged. The plurality of control switches 104 are respectively arranged at the insulated intersections of the plurality of scan lines 102 and the plurality of data lines 103. Each control switch 104 includes a control electrode G, a first transmission electrode S, and a second transmission electrode D. Among them, the control electrode G is connected to the scan line 102, the first transmission electrode S is connected to the data line 103, and the second transmission electrode D is connected to the first electrode 101. The second electrode 105 is used to form an electric field with the first electrode 101 to control the light transmittance of the touch display panel 10. In this embodiment, since the touch liquid crystal display device is taken as an example, accordingly, the second electrode 105 is a common electrode.

[0112] In this embodiment, the plurality of scan lines 102 and the plurality of data lines 103 are arranged to cross each other perpendicularly. Specifically, the plurality of scan lines 102 extend along the first direction X and are arranged along the second direction Y; the plurality of data lines 103 extend along the second direction Y and are arranged along the first direction X. In this embodiment, the first direction X is the row direction, and the second direction Y is the column direction. Alternatively, in other embodiments, the first direction X may also be the column direction, and the second direction Y may be the row direction. In addition, the first direction X and the second direction Y may also be non-perpendicular.

[0113] In this embodiment, the control switch 104 is a thin film transistor switch. The thin film transistor switch includes an amorphous silicon thin film transistor switch, a low temperature polysilicon thin film transistor switch, a high temperature polysilicon thin film transistor switch, a metal oxide thin film transistor switch, etc. Among them, the metal oxide thin film transistor switch is, for example, an indium gallium zinc oxide (IGZO) thin film transistor switch. Accordingly, the control electrode G is a gate, the first transmission electrode S is a source, and the second transmission electrode D is a drain. However, in other embodiments, the control switch 104 may also be other suitable types of switches, such as a bipolar transistor switch.

[0114] The driving circuit 20 is used to provide a touch sensing control signal to the plurality of scan lines 102, and activate the control switch 104 connected to the plurality of scan lines 102. In addition, the driving circuit 20 is also used to provide the touch sensing drive signal to the plurality of data lines 103, and the touch sensing drive signal is transmitted to the first electrode 101 through the activated control switch 104, thereby driving the first electrode 101 to perform self-capacitive touch sensing.

[0115] The touch sensing driving signal is a changing voltage signal, for example, a periodically changing square wave pulse signal. However, the touch sensing driving signal may also be other suitable driving signals such as a current signal, and is not limited to a voltage signal. In addition, the touch sensing driving signal may also be a non-periodic signal, as well as other suitable waveform signals such as a sine wave, a trapezoidal wave, etc.

[0116] In this embodiment, during touch sensing, the voltage difference between the touch sensing control signal and the touch sensing driving signal remains unchanged. Accordingly, the touch sensing control signal is also a changing signal, and turns on the control switch 104.

[0117] Since the voltage difference between the touch sensing control signal and the touch sensing drive signal remains unchanged when the touch display panel 10 performs touch sensing, the charge and discharge amount of the parasitic capacitance formed between the control electrode G and the first electrode 101 can be reduced, thereby improving the touch sensing accuracy.

[0118] Furthermore, when the first electrode 101 performs touch sensing, the driving circuit 20 can further provide a second signal to the scan line 102 connected to the first electrode 101 that does not perform touch sensing, and the second signal can put the control switch 104 in an off state while maintaining the voltage difference with the touch sensing driving signal unchanged.

[0119] For example, the second signal may be provided to the scan line 102 adjacent to the first electrode 101 performing touch sensing, or all the scan lines 102 connected to the first electrode 101 not performing touch sensing. Here, for the concept of "adjacent", for example, if the first electrodes 101 in the 41st to 80th rows are simultaneously driven by the driving circuit 20 to perform self-capacitive touch sensing, then the 1st to 40th scan lines 102 are the scan lines adjacent to the first electrode 101 in the 41st row, and the 81st to 120th scan lines 102 are the scan lines adjacent to the first electrode 101 in the 80th row. The "adjacent" scan lines 102 are, for example, scan lines 102 within 40 adjacent to the first electrode 101 performing touch sensing (in terms of a single side). However, the number of the "adjacent" scan lines 102 may also be extended to scan lines 102 within 200 (in terms of a single side).

[0120] In addition to the above-mentioned variable voltage signal, the touch sensing control signal can also be a constant signal in other embodiments for activating the control switch 104. In addition, the touch sensing control signal is not limited to maintaining a constant voltage difference with the touch sensing driving signal.

[0121] The driving circuit 20 is further used to receive a touch sensing detection signal output from the first electrode 101 through the activated control switch 104 and the data line 103, and to know the position of the touch display panel 10 touched or approached by the target object (i.e., the above-mentioned touch object) according to the touch sensing detection signal. The target object may be a user's finger, toe or other parts, or may be other suitable types of objects, such as a touch pen, etc., and the following mainly takes the target object as a finger as an example for explanation. The capacitance between the target object and the first electrode 101 is defined as the contact capacitance (not shown).

[0122] When performing touch sensing, the driving circuit 20 may drive the scan lines 102 row by row, or may drive at least two scan lines 102 simultaneously at one time. In one embodiment, for example, at least two scan lines 102 are driven simultaneously each time. The at least two scan lines 102 are adjacent scan lines. However, it is possible to change that the at least two scan lines 102 may not be adjacent scan lines, such as interlaced scan lines or other suitable situations. Further, when the scan line 102 is scanned or the control switch 104 is activated, the driving circuit 20 performs self-capacitance touch sensing on part or all of the first electrodes 101 connected to the activated control switch 104. In other words, the driving circuit 20 provides a touch sensing drive signal to part or all of the data lines 103.

[0123] When the driving circuit 20 is used to perform self-capacitance touch sensing on the first electrode 101 connected to part of the data line 103, the driving circuit 20 further provides a third signal to the data line 103 connected to the first electrode 101 that does not perform touch sensing, and the voltage difference between the third signal and the touch sensing driving signal remains unchanged.

[0124] For example, the third signal may be provided to the data line 103 adjacent to the first electrode 101 performing touch sensing, or all the data lines 103 connected to the first electrode 101 not performing touch sensing. Here, for the concept of "adjacent", for example, if the first electrodes 101 in the 51st column to the 100th column are simultaneously driven by the driving circuit 20 to perform self-capacitive touch sensing, then the 1st to 50th data lines 103 are data lines adjacent to the first electrode 101 in the 51st column, and the 101st to 150th data lines 103 are data lines adjacent to the first electrode 101 in the 100th column. The "adjacent" data lines 103 are, for example, data lines 103 within 50 adjacent to the first electrode 101 performing touch sensing (in terms of a single side). However, the number of the "adjacent" data lines 103 may also be extended to data lines 103 within 250 (in terms of a single side).

[0125] Furthermore, the driving circuit 20 is also used to provide a scanning signal to the plurality of scanning lines 102, activate the control switch 104 connected to the plurality of scanning lines 102, and the grayscale voltage provided by the driving circuit 20 is transmitted to the first electrode 101 through the data line 103 and the activated control switch 104. In addition, the driving circuit 20 also provides a common voltage to the second electrode 105, thereby driving the touch display panel 10 to perform image display refresh. The scanning signal for activating the control switch 104 is preferably a constant voltage. The voltage difference between the first electrode 101 and the second electrode 105 is used to determine the display grayscale level of the touch display device 1.

[0126] It can be seen from the above description that since the touch display device 1 of the present invention performs a touch sensing function by multiplexing the multiple scan lines 102, the multiple data lines 103, the multiple control switches 104, and the multiple first electrodes 101 of the display panel, the touch display device 1 of the present invention and the electronic device 100 having the touch display device 1 are relatively light and thin.

[0127] The common voltage (or "first signal") provided by the driving circuit 20 to the second electrode 105 when driving the first electrode 101 to perform touch sensing is different from the common voltage provided to the second electrode 105 when driving the first electrode 101 to perform image display refresh, wherein the voltage difference between the common voltage provided by the driving circuit 20 to the second electrode 105 when driving the first electrode 101 to perform touch sensing and the touch sensing driving signal provided to the first electrode 101 remains unchanged; the common voltage provided by the driving circuit 20 to the second electrode 105 when driving the first electrode 101 to perform image display refresh can be a constant voltage, but can also be a square wave signal.

[0128] Since the voltage difference between the common voltage provided to the second electrode 105 and the touch sensing driving signal provided to the first electrode 101 by the driving circuit 20 when driving the first electrode 101 to perform touch sensing remains unchanged, the capacitive coupling interference caused by the second electrode 105 when performing touch sensing on the first electrode 101 can be reduced or avoided, thereby improving the touch sensing accuracy.

[0129] However, it is configurable that the common voltage (or "first signal") provided to the second electrode 105 by the driving circuit 20 when driving the first electrode 101 to perform touch sensing may be the same as the common voltage provided to the second electrode 105 when driving the first electrode 101 to perform image display refresh, but the sensing effect is relatively not as good as the above effect.

[0130] Generally, electronic devices usually include a bright screen working state and a black screen standby state. In the black screen standby state, the electronic device usually does not do substantial work, the touch display panel appears black, and no light passes through. Relatively speaking, in the bright screen working state, the electronic device has light passing through the touch display panel and can perform corresponding functions. Specifically, the bright screen working state may include a bright screen lock state and a bright screen unlock state. When the electronic device is in the black screen standby state, the user needs to first press the power button or the Home button of the electronic device to wake up the touch display device to the bright screen lock state, and then the user enters the password. When the password is correct, the touch display device enters the unlocked state, and the user can start to control the electronic device to perform the corresponding function.

[0131] However, after a large number of times of pressing the power button or the home button, it may fail, resulting in the need to replace new parts. In addition, the above-mentioned procedure for controlling the electronic device to switch from the black screen standby state to the unlocked state is slightly complicated. Accordingly, the inventor of the present invention has proposed a new wake-up method for the electronic device through extensive research.

[0132] In the black screen standby state, the touch display device 1 of the present invention performs a touch sensing function. When the target object touches the touch display panel 10 in a predetermined manner, the touch display device 1 wakes up and enters the lock screen state or directly enters the unlock screen state. The predetermined manner may be a specific touch path, etc., thereby improving the use quality and efficiency of the product and making the electronic device 100 more user-friendly.

[0133] For clear distinction, the common voltage provided to the second electrode 105 by the driving circuit 20 when driving the first electrode 101 to perform image display refresh is defined as the first common voltage; the common voltage provided to the second electrode 105 by the driving circuit 20 when the electronic device 100 is in the bright screen working state and the first electrode 101 is driven to perform touch sensing is defined as the second common voltage; the common voltage provided to the second electrode 105 by the driving circuit 20 when the electronic device 100 is in the black screen standby state and the first electrode 101 is driven to perform touch sensing is defined as the third common voltage.

[0134] Specifically, in the black screen standby state, the driving circuit 20 provides a touch sensing driving signal to the first electrode 101, and provides a third common voltage to the second electrode 105. The touch sensing driving signal is the same as the third common voltage, so that the touch display panel 10 not only displays a black screen, but also performs a touch sensing function.

[0135] Further, in the black screen standby state, the driving circuit 20 stops providing the grayscale voltage to the first electrode 101, and stops providing the first common voltage to the second electrode 105. That is, in the black screen standby state, the touch display device 1 preferably continues to perform touch sensing. However, it can be changed that in the black screen standby state, the driving circuit 20 can also drive the first electrode 101 to perform image display refresh and self-capacitive touch sensing in a time-sharing manner. Among them, when performing image display refresh, the grayscale voltage provided by the driving circuit 20 to the first electrode 101 is the same as the common voltage provided to the second electrode 105, thereby realizing black screen display.

[0136] It should be noted that, in the bright screen working state, when the driving circuit 20 drives the touch display panel 10 to perform touch sensing, the second common voltage is provided to the second electrode 105. The second common voltage may be different from the third common voltage.

[0137] Typically, a liquid crystal display panel includes a plurality of pixel units, each of which includes sub-pixels of three colors: R, G, and B. By controlling the light output brightness of the sub-pixels of the three colors, a color image display of different grayscales is realized. Each sub-pixel includes a control switch, a pixel electrode connected to the control switch, and a common electrode. The voltage applied to the pixel electrode and the common electrode determines the deflection angle of the liquid crystal molecules, thereby determining the light transmittance of the sub-pixel, and combining the color of the color filter to realize color image display.

[0138] See also Figure 4 , Figure 4 1 is a structural diagram of another embodiment of a touch display panel 10. The touch display panel 10 further includes a first substrate 106, a second substrate 107 disposed opposite to the first substrate 106, and a display medium layer 108 disposed between the first substrate 106 and the second substrate 107. In this embodiment, the display medium layer 108 is a liquid crystal layer. The first substrate 106 and the second substrate 107 are transparent substrates, such as glass substrates or film substrates. The plurality of scan lines 102, the plurality of data lines 103, the plurality of control switches 104, the second electrode 105, and the plurality of first electrodes 101 are disposed between the first substrate 106 and the second substrate 107.

[0139] In this embodiment, the plurality of scan lines 102, the plurality of data lines 103, the plurality of control switches 104, and the plurality of first electrodes 101 are formed on the second substrate 107 to form an array substrate, such as a thin film transistor (TFT) array substrate. In addition, in order to realize color image display, a color filter and a black matrix and other components (not shown) are preferably provided on the side of the first substrate 106 facing the second substrate 107 to form a color filter (CF) substrate. The side of the first substrate 106 facing away from the second substrate 107 is used for image display and receiving a user's touch or proximity input. The side of the first substrate 106 used for image display and receiving a user's touch or proximity input is defined as a touch display side A.

[0140] A fringe electric field is formed between the first electrode 101 and the second electrode 105 to control the deflection angle of the liquid crystal molecules, thereby controlling the light transmittance of the touch display panel 10. In this embodiment, the second electrode 105 and the plurality of first electrodes 101 are located in different layers and are stacked with the plurality of first electrodes 101. Further, the second electrode 105 is located between the display medium layer 108 and the plurality of first electrodes 101. The second electrode 105 is provided with a hollow structure 115 in the region corresponding to the first electrode 101, so that a fringe electric field is formed between the second electrode 105 and the plurality of first electrodes 101.

[0141] Please also read Figure 5 , Figure 5 for Figure 4 A partially enlarged plan view of the second electrode 105 and the first electrode 101 is shown. A plurality of hollow structures 115 corresponding to the same first electrode 101 are arranged along a third direction and extend along a fourth direction. In this embodiment, the third direction is the same as the first direction X, and the fourth direction is the same as the second direction Y. However, the present invention is not limited thereto, and the third direction may also be the same as the second direction Y, and the fourth direction may be the same as the first direction X, or the third direction, the fourth direction may be different from the first direction X and the second direction Y. The plurality of hollow structures 115 are, for example, strip-shaped, but the plurality of hollow structures 115 may also be other suitable shapes, and the present invention does not limit this. For another example, the plurality of hollow structures 115 are the same in size and shape, but, variably, the plurality of hollow structures 115 may also be different in size and shape.

[0142] In the direction in which the plurality of hollow structures 115 (facing the same first electrode 105) are arranged, the width L1 of the hollow structure 115 is greater than or equal to the width L2 of the area between adjacent hollow structures 115, or / and, the area A2 of the area 113 (the area with uniform slashes to distinguish the hollow structures 115) between adjacent hollow structures 115 facing the same first electrode 101 is preferably less than or equal to the area A1 of a hollow structure 115, wherein the edge of the area 113 between the adjacent hollow structures 115 does not exceed the edge of the hollow structure 115. Accordingly, the capacitive coupling area between the first electrode 101 and the target object should be correspondingly increased, thereby improving the touch sensing accuracy.

[0143] See also Figure 6 , Figure 6 for Figure 4 A partial cross-sectional structural diagram of another embodiment of the touch display panel 10 is shown. Figure 4 The touch display panel 10, Figure 6 The touch display panel shown is labeled as 10a, and the same reference numerals are used for the same or similar elements in the touch display panel 10. The touch display panel 10a is substantially the same as the touch display panel 10, and the main difference between the two is that the second electrode 105 is disposed between the first electrode 101 and the second substrate 107; in addition, the display medium layer 108 and the first substrate 106 are omitted.

[0144] Since the first electrode 101 is disposed on the second electrode 105 , the first electrode 101 can be relatively enlarged, thereby increasing the capacitance area coupled with the target object or the touch object, thereby improving the touch sensing accuracy.

[0145] When the second electrode 105 is disposed between the first electrode 101 and the second substrate 107, the second electrode 105 may not be provided with a hollow structure 115. However, in order to improve the fringe electric field strength, the hollow structure 115 as described above may be provided on the first electrode 101. Alternatively, when the first electrode 101 is located between the first substrate 106 and the second electrode 105, the first electrode 101 and the second electrode 105 may not be provided with a hollow structure.

[0146] Please also read Figure 7 , Figure 7 for Figure 6 A partially enlarged plan view of the second electrode 105 and the first electrode 101 is shown. There is also an area 113 between adjacent hollow structures 115 on the same first electrode 101. Accordingly, for multiple hollow structures 115 on the same first electrode 101: along the direction in which the multiple hollow structures 115 are arranged, the width L1 of the hollow structure 115 is less than or equal to the width L2 of the area between adjacent hollow structures 115, or / and, the area A2 of the area 113 between adjacent hollow structures 115 is preferably greater than or equal to the area A1 of a hollow structure 115, wherein the edge of the area 113 between the adjacent hollow structures 115 does not exceed the edge of the hollow structure 115. Accordingly, the capacitive coupling area between the first electrode 101 and the target object should be correspondingly increased, thereby improving the touch sensing accuracy.

[0147] It should be noted that, no matter whether the second electrode 105 is disposed above or below the first electrode 101 , an insulating layer (not shown) is disposed between the two types of electrodes.

[0148] In addition, the present invention does not limit the formation of a fringe electric field between the first electrode 101 and the second electrode 105. Alternatively, a vertical electric field may be formed between the second electrode 105 and the first electrode 101. Accordingly, the second electrode 105 is disposed between the first substrate 106 and the display medium layer 108, and it is also feasible that the side of the second substrate 107 facing away from the first substrate 106 is used as the above-mentioned touch display side A. In addition, the plurality of first electrodes 101 and the second electrode 105 may also be located in the same layer, and a fringe electric field may also be formed.

[0149] Since the data line 103 and the control switch 104 are used to transmit the touch sensing drive signal to the first electrode 101, when the target object touches the position corresponding to the data line 103 and / or the control switch 104 on the touch display panel 10, false sensing may be caused or the accuracy of the real sensing may be affected.

[0150] Accordingly, in order to overcome the above-mentioned problems, a shielding layer may be further provided in the touch display panel 10, and the shielding layer is located between the first substrate 106 and the data line 103 and the control switch 104, and is used to cover the data line 103 and the control switch 104. The driving circuit 20 provides a shielding signal to the shielding layer. The voltage difference between the shielding signal and the touch sensing driving signal remains unchanged, thereby avoiding the influence of the data line 103 and the control switch 104 on the sensing accuracy of the first electrode 101. Of course, the shielding layer may also only cover one of the two types of components, the data line 103 and the control switch 104, which can also solve the above-mentioned problems to a certain extent, but it is not necessarily limited to covering these two types of components. Preferably, at least the data line 103 should be covered.

[0151] It should be noted that the shielding layer can be an integrated structure or a split structure. When the shielding layer is a split structure, the shielding layer includes a first shielding electrode and a second shielding electrode, wherein the first shielding electrode partially or completely covers the data line 103, and the second shielding electrode partially or completely covers the control switch 104.

[0152] Furthermore, since there is a parasitic capacitance between the scan line 102 and the first electrode 101, when the target object touches the position corresponding to the scan line 102 on the touch display panel 10, the touch sensing accuracy of the first electrode 101 will also be affected. Accordingly, the shielding layer covers the scan line 102, or the shielding layer further includes a fourth shielding electrode, and the fourth shielding electrode partially or completely covers the scan line 102. Preferably, the shielding layer completely covers the multiple scan lines 102, the multiple data lines 103, and the multiple control switches 104.

[0153] When an additional shielding layer is provided, the technical problem of reduced sensing accuracy can be solved, but the thickness of the touch display panel 10 will be increased in disguise. Therefore, the present invention proposes to select and reuse the second electrode 105 as the shielding layer.

[0154] Please also read Figure 8 and Figure 4 , Figure 8 for Figure 4The schematic diagram of the structure of the touch display panel 10 after assembly is shown. The adjacent two sides of the second substrate 107 protrude from the first substrate 106 for edge routing. According to the size of the touch display panel 10, for example, a small-sized touch display panel, the second substrate 107 may protrude from the first substrate 106 on only one side. The area where the first substrate 106 and the second substrate 107 overlap is defined as a touch display area T, and the area where the second substrate 107 protrudes from the first substrate 106 is defined as an edge area H. The second electrode 105, for example, completely covers the data line 103, the scan line 102, and the control switch 104 located in the touch display area T.

[0155] A first connection line 109, a second connection line 110, and a third shielding electrode 111 are further provided in the edge region H. The first connection line 109 is used to connect the data line 103 to the driving circuit 20 (see Figure 3 ). It should be noted that Figure 3 The first connection line 109, the second connection line 110, and the third shielding electrode 111 are omitted. The second connection line 110 is used to connect the scanning line 102 to the driving circuit 20 (see Figure 3 ). The first connection line 109 and the second connection line 110 are located between the third shielding electrode 111 and the second substrate 107. The driving circuit 20 is used to provide a shielding signal to the third shielding electrode 111. Thus, the influence on the touch sensing accuracy when the target object touches the edge area H of the electronic device 100 is avoided. Preferably, the voltage difference between the shielding signal and the touch sensing driving signal remains unchanged.

[0156] It should be noted that an insulating layer also needs to be provided between the third shielding electrode 111 and the first connecting line 109 and the second connecting line 110 .

[0157] For the first connecting line 109: it may be made of the same material as the control electrode G, or the same material as the data line 103, or the same material as the first electrode 101, or the same material as the second electrode 105, or the same material as the first transmission electrode S and the second transmission electrode D, or it may be made of a conductive material different from the control electrode G, the data line 103, the first electrode 101, the second electrode 105, the first and second transmission electrodes S and D.

[0158] The second connecting line 110 may be made of the same material as the control electrode G, the same material as the data line 103, the same material as the first electrode 101, the same material as the second electrode 105, the same material as the first transmission electrode S and the second transmission electrode D, or may be made of a conductive material different from that of the control electrode G, the data line 103, the first electrode 101, the second electrode 105, the first and second transmission electrodes S and D.

[0159] The third shielding electrode 111 may be made of the same material as the control electrode G, the same material as the first electrode 101, the same material as the data line 103, the same material as the second electrode 105, the same material as the first transmission electrode S and the second transmission electrode D, or may be made of a conductive material different from that of the first electrode 101, the data line 103, the second electrode 105, the first transmission electrode S and the second transmission electrode D.

[0160] Specifically, the first connecting line 109, the second connecting line 110, and the third shielding electrode 111 can be formed in various situations during manufacture. In the following, the control switch 104 is mainly described as a bottom-gate thin film transistor (Bottom-gate TFT) switch. However, the control switch 104 can also be a top-gate TFT thin film transistor switch. The manufacturing sequence of the first connecting line 109, the second connecting line 110, the third shielding electrode 111 and the corresponding elements (such as the data line 103) or certain parts of the elements (such as the control electrode G) in the touch display panel 10 can be adjusted accordingly. Therefore, the contents that can be directly or indirectly deduced from the contents described below should fall within the protection scope of the present application.

[0161] First, when the material of the first connection line 109 and the material of the second connection line 110 are the same as the material of the control electrode G, the material of the first connection line 109 and the material of the second connection line 110 are preferably made of the same layer of material as the control electrode G, and more preferably, the first connection line 109, the second connection line 110 and the control electrode G are formed at the same time. Thus, materials and production time can be saved, production efficiency can be improved, and product cost can be reduced.

[0162] Since the control switch 104 is a bottom-gate thin-film transistor switch, considering the manufacturing sequence, accordingly, the third shielding electrode 111 and the first electrode 101 are made of the same layer of material, and are preferably formed at the same time; or, the third shielding electrode 111 and the data line 103 are made of the same layer of material, and are preferably formed at the same time; or, the third shielding electrode 111 and the second electrode 105 are made of the same layer of material, and are preferably formed at the same time; or, the third shielding electrode 111 and the first and second transmission electrodes S and D are made of the same layer of material, and are preferably formed at the same time; or, the third shielding electrode 111 is made of an additional layer of conductive material.

[0163] Similarly, when the first connection line 109 and the second connection line 110 are made of the same material as the data line 103, the first connection line 109 and the second connection line 110 are preferably made of the same layer of material as the data line 103, and more preferably, the three are formed simultaneously.

[0164] Correspondingly, the third shielding electrode 111 and the first electrode 101 are made of the same layer of material and are preferably formed at the same time; or, the third shielding electrode 111 and the second electrode 105 are made of the same layer of material and are preferably formed at the same time; or, the third shielding electrode 111 and the first and second transmission electrodes S and D are made of the same layer of material and are preferably formed at the same time; or, the third shielding electrode 111 is made of an additional layer of conductive material.

[0165] In addition, the first connecting line 109 and the second connecting line 110 can also be made of an additional layer of conductive material, and the third shielding electrode 111 and the corresponding element or a part of the element in the touch display panel 10 are made of the same layer of material and are preferably formed at the same time. Alternatively, the third shielding electrode 111 can also be made of an additional layer of conductive material.

[0166] Alternatively, the first connection line 109, the second connection line 110, and the third shielding electrode 111 may also be made of conductive materials of different layers. The various specific embodiments herein will not be described in detail, and various situations can be deduced based on the above content.

[0167] It should be noted that when the corresponding elements or some parts of the elements in the touch display panel 10 are made of the same layer of material, it should be noted that the manufacturing order of the first connecting line 109, the second connecting line 110, and the third shielding electrode 111 should be consistent with the manufacturing order of the corresponding elements or some parts of the elements in the touch display panel 10. In addition, the aforementioned elements preferably formed simultaneously may also be formed in different time periods in other embodiments, and the present invention is not limited to this.

[0168] Please refer to Figure 3, the driving circuit 20 includes a touch driving circuit 201, a display driving circuit 203, and a common voltage generating circuit 207. The touch driving circuit 201 is connected to the scan line 102 and the data line 103 respectively, and is used to provide a touch sensing control signal to the scan line 102, and is also used to provide a touch sensing driving signal to the first electrode 101 through the data line 103 and the control switch 104, and drive the first electrode 101 to perform self-capacitive touch sensing. The display driving circuit 203 is connected to the scan line 102 and the data line 103 respectively, and is used to provide a scan signal to the scan line 102, and is used to provide a grayscale voltage to the first electrode 101 through the data line 103 and the control switch 104. The common voltage generating circuit 207 is also used to provide a first common voltage to the second electrode 105 to perform image display refresh.

[0169] The driving circuit 20 further includes a control circuit 205. The control circuit 205 is connected to the touch driving circuit 201 and the display driving circuit 203, respectively, and is used to control whether the touch driving circuit 201 outputs a touch sensing control signal and a touch sensing driving signal to the touch display panel 10 or the display driving circuit 203 outputs a scan signal and a grayscale voltage to the touch display panel 10. In addition, the control circuit 205 is also used to control the driving circuit 20 to provide different common voltages to the second electrode 105 when the first electrode 101 performs image display refresh and touch sensing. It should be noted that when the driving circuit 20 performs image display refresh and touch sensing on the first electrode 101, the common voltage provided to the second electrode 105 may also be the same.

[0170] Preferably, the touch drive circuit 201 includes a touch sensing control circuit 2011 and a touch sensing detection circuit 2013. The touch sensing control circuit 2011 is connected to the plurality of scan lines 102, and is used to provide a touch sensing control signal to the plurality of scan lines 102, and activate the control switch 104 connected to the scan line 102. The touch sensing detection circuit 2013 is connected to the plurality of data lines 103, and is used to provide a touch sensing drive signal to the first electrode 101 through the data line 103 and the activated control switch 104, and drive the first electrode 101 to perform self-capacitive touch sensing. The touch sensing detection circuit 2013 further receives a touch sensing detection signal output from the first electrode 101 through the activated control switch 104 and the data line 103, and obtains the position of the touch display panel 10 touched or approached by the target object according to the touch sensing detection signal. Among them, the touch sensing control circuit 2011 is either formed in a chip or formed on the touch display panel 10. When formed on the touch display panel 10, the touch sensing control circuit 2011 and the control switch 104 are formed together on the second substrate 107 of the touch display panel 10 (the second substrate 107 is shown in FIG. 1 ). Figure 4 ).

[0171] The display driving circuit 203 includes a scanning driving circuit 2031 and a data driving circuit 2033. The scanning driving circuit 2031 is connected to the plurality of scanning lines 102, and is used to provide scanning signals to the plurality of scanning lines 102, and activate the control switches 104 connected to the scanning lines 102. The data driving circuit 2033 is connected to the plurality of data lines 103, and is used to provide grayscale voltages to the plurality of first electrodes 101 through the data lines 103 and the activated control switches 104, and drive the plurality of first electrodes 101 to perform image display refresh. The scanning driving circuit 2031 is either formed in a chip or formed on the touch display panel 10. When formed on the touch display panel 10, the scanning driving circuit 2031 and the control switch 104 are preferably formed together on the second substrate 107 of the touch display panel 10 (the second substrate 107 is shown in FIG. 1 ). Figure 4 ).

[0172] It should be noted that Figure 3 10 is shown in FIG. 1 , where the touch sensing detection circuit 2013 and the data driving circuit 2033 are located on opposite sides of the touch display panel 10, and are connected to opposite ends of the data line 103, respectively. However, preferably, the touch sensing detection circuit 2013 and the data driving circuit 2033 are both connected to the terminals on the same side of the data line 103 (see below). Fig.11 and Fig.12 ), Figure 3Due to the size of the drawings and the connection relationship of components, the touch sensing detection circuit 2013 and the data driving circuit 2033 are connected to the opposite ends of the data line 103 .

[0173] Preferably, the driving circuit 20 further includes a common voltage generating circuit 207. The common voltage generating circuit 207 is connected to the control circuit 205, and is used to generate the first common voltage, the second common voltage, and the third common voltage, and output corresponding common voltages to the second electrode 105 under the control of the control circuit 205.

[0174] Specifically, when the touch display device 1 executes an image, the control circuit 205 controls the common voltage generating circuit 207 to provide a first common voltage to the second electrode 105; when the touch display device 1 is in a bright screen working state and performs self-capacitance touch sensing, the control circuit 205 controls the common voltage generating circuit 207 to provide a second common voltage to the second electrode 105; when the touch display device 1 is in a black screen standby state and performs self-capacitance touch sensing, the control circuit 205 controls the common voltage generating circuit 207 to provide a third common voltage to the second electrode 105.

[0175] In this embodiment, the touch sensing control circuit 2011 includes a plurality of output terminals a. Each output terminal a is connected to at least two scan lines 102. The touch sensing control circuit 2011 simultaneously outputs a touch sensing control signal to at least two scan lines 102 through each output terminal a, and activates the control switch 104 connected to the at least two scan lines 102. Alternatively, the output terminal a of the touch sensing control circuit 2011 may also be connected to one scan line 102. The touch sensing control circuit 2011 may output a touch sensing control signal to at least two scan lines 102 through one output terminal a at a time, and may also simultaneously output a touch sensing control signal to multiple scan lines 102 through multiple output terminals a at a time, and the present invention does not limit this.

[0176] The touch sensing detection circuit 2013 includes a plurality of transmission terminals b. Preferably, the transmission terminals b are connected to at least two data lines 103. The touch sensing detection circuit 2013 outputs a touch sensing driving signal to the at least two data lines 103 through the transmission terminals b, and receives a touch sensing detection signal output from the at least two data lines 103 through the transmission terminals b. Alternatively, the transmission terminal b of the touch sensing detection circuit 2013 may also be connected to one data line 103. The at least two data lines 103 are, for example, adjacent data lines. However, the at least two data lines 103 may also be non-adjacent data lines, such as alternate column data lines or other suitable situations.

[0177] It can be seen that when performing touch sensing, the multiple first electrodes 101 are divided into multiple groups, and the multiple first electrodes 101 connected to the same output terminal a and the same transmission terminal b form a group, which are connected in parallel to form a touch sensing electrode. Preferably, the first electrodes 101 connected in parallel are arranged in a matrix. A touch sensing electrode formed by connecting multiple first electrodes 101 in the same group in parallel corresponds to a touch point on the touch display panel 10, and the touch point is, for example, a square area with a length and width of 1 mm, but the present application is not limited to this. The touch point can also be a rectangular area with a length and width of other sizes. Correspondingly, the number of first electrodes 101 increases or decreases, or the size of the first electrode 101 itself changes accordingly. For the case where there is only one first electrode 101 in a group, this group also corresponds to a touch point on the touch display panel 10. As mentioned above, since the first electrode 101 is approximately rectangular, the square area and the rectangular area also correspond to an approximately square area and an approximately rectangular area.

[0178] In this embodiment, each output end a is connected to at least two scan lines 102, and some transmission ends b are respectively connected to at least two data lines 103, and some transmission ends b are respectively connected to one data line 103. Alternatively, in other embodiments, some transmission ends b are respectively connected to at least two data lines 103, and some transmission ends b are respectively connected to one data line 103; some output ends a are respectively connected to at least two scan lines 102, and some output ends a are respectively connected to one scan line 102. Accordingly, the plurality of first electrodes 101 are divided into a plurality of groups, at least one group includes at least two first electrodes 101 connected in parallel, and at least one group includes one first electrode 101.

[0179] Optionally, the number of scan lines 102 located at the edge of the touch display panel 10 connected to one output terminal a is less than the number of scan lines 102 located in the middle of the touch display panel 10 connected to another output terminal a; and / or the number of data lines 103 located at the edge of the touch display panel 10 connected to one transmission terminal b is less than the number of data lines 103 located in the middle of the touch display panel 10 connected to another transmission terminal b. Accordingly, the edge touch sensing accuracy of the touch display panel 10 is improved.

[0180] The touch point located in the middle area of ​​the touch display panel 10 is, for example, a square area with a length and width of 1 mm, and the touch point located in the edge area of ​​the touch display panel 10 is, for example, a square area with a length and width of 0.5 mm. However, the present invention is not limited to this. The touch point on the touch display panel 10 may also be a rectangular area with a length and width of other sizes.

[0181] Correspondingly, for example, the number of scan lines 102 connected to the output terminal a connected to the scan line 102 located at the edge of the touch display panel 10 is 10 to 20, and the number of scan lines 102 connected to the output terminal a connected to the scan line 102 located in the middle of the touch display panel 10 is 25 to 45; the number of data lines 103 connected to the transmission terminal b connected to the data line 103 located at the edge of the touch display panel 10 is 25 to 35, and the number of data lines 103 connected to the transmission terminal b connected to the data line 103 located in the middle of the touch display panel 10 is 40 to 60. Thus, the edge touch sensing accuracy is improved. However, for an amorphous silicon liquid crystal display panel and a low-temperature polycrystalline silicon liquid crystal display panel, or for touch display panels 10 of different sizes, the range of the number of scan lines 102 connected to the output terminal a connected to the scan line 102 located at the edge of the touch display panel 10 may be different, and the range of the number of scan lines 102 connected to the output terminal a connected to the scan line 102 located in the middle of the touch display panel 10 may also be different. Similarly, the range of the number of data lines 103 connected to the transmission terminal b may also be different. Therefore, the present invention does not limit this and is only an example.

[0182] However, in other embodiments, the number of scan lines 102 connected to each output terminal a may be the same, and the number of data lines 103 connected to each transmission terminal b may be the same. For example, each output terminal a is connected to 25 to 45 scan lines 102, and each transmission terminal b is connected to 40 to 60 data lines 103. Thus, the touch sensing accuracy is improved. However, for an amorphous silicon liquid crystal display panel and a low-temperature polysilicon liquid crystal display panel, or for a touch display panel 10 of different sizes, the number range of the scan lines 102 connected to the output terminal a may be different. Similarly, the number range of the data lines 103 connected to the transmission terminal b may also be different. Therefore, the present invention does not limit this, but is only an example.

[0183] In addition, in addition to the above-mentioned method of setting the number of connections between the output terminal a and the scan lines 102 to achieve the effect of simultaneously outputting the touch sensing control signal to at least two scan lines 102, each output terminal a may be connected to only one scan line 102, and the touch sensing control circuit 2011 may output the touch sensing control signal to at least two scan lines 102 once or each time through software settings or a combination of software and hardware, rather than being limited to setting one output terminal a to connect to at least two scan lines 102. Similarly, each data line 103 may be connected to only one transmission terminal b, and the touch sensing detection circuit 2013 may perform group calculation on the received touch sensing detection signals through software settings or a combination of software and hardware, rather than being limited to setting one transmission terminal b to connect to at least two data lines 103.

[0184] It should be noted that when performing touch sensing, the multiple first electrodes 101 are divided into multiple groups, and the multiple first electrodes 101 in the same group are connected in parallel to each other; however, when performing image display refresh, the multiple first electrodes 101 are not connected in parallel.

[0185] Since the plurality of first electrodes 101 of the touch display device 1 are divided into a plurality of groups, the driving circuit 20 drives the first electrodes 101 of each group to perform self-capacitive touch sensing, and thus the touch display device 1 can implement true multi-point self-capacitive touch sensing. In addition, by setting different numbers of first electrodes 101 in different groups, the touch sensing accuracy of different positions on the touch display panel 10 can be set accordingly.

[0186] Please also read Fig. 9 and Figure 3 , Fig. 9 for Figure 3 Schematic diagram of the structure of the touch sensing detection circuit 2013. The touch sensing detection circuit 2013 includes a plurality of touch sensing detection units 232, a second signal processing circuit 233, and a plurality of processing units 235. Each touch sensing detection unit 232 is respectively connected to the second signal processing circuit 233 and a processing unit 235. The plurality of touch sensing detection units 232 are further connected to the plurality of transmission terminals b in a one-to-one correspondence, or each of the touch sensing detection units 232 includes a node used as the transmission terminal b.

[0187] It should be noted that, in this embodiment, the touch sensing detection circuit 2013 includes a second signal processing circuit 233, and all touch sensing detection units 232 share a second signal processing circuit 233. Alternatively, in other embodiments, the touch sensing detection circuit 2013 may also include multiple second signal processing circuits 233, and some touch sensing detection units 232 share a second signal processing circuit 233. In addition, it is not limited to each touch sensing detection unit 232 being separately connected to a processing unit 235, and several touch sensing detection units 232 may also time-share a processing unit 235.

[0188] The second signal processing circuit 233 is used to output a touch sensing drive signal to the touch sensing detection unit 232. The touch sensing detection unit 232 is used to output a touch sensing drive signal to the data line 103, so as to further output the touch sensing drive signal to the first electrode 101 through the activated control switch 104, and perform self-capacitance touch sensing on the first electrode 101.

[0189] The touch sensing detection unit 232 further receives the touch sensing detection signal output from the first electrode 101, processes the touch sensing detection signal accordingly (such as voltage waveform conversion of the touch sensing detection signal, or voltage magnitude conversion, or voltage waveform conversion to current waveform, or charge to voltage conversion), and outputs the processed signal to the processing unit 235. The processing unit 235 further processes the input signal from the touch sensing detection unit 232 (such as analog-to-digital conversion), and calculates the touch coordinates.

[0190] Please also read Fig.10 , Fig.10 for Fig. 9 The structural diagram of an embodiment of the touch sensing detection unit 232 and the processing unit 235 is shown. The touch sensing detection unit 232 includes a first operational amplifier P1, a feedback capacitor Cf, and a fourth switch K4. The first operational amplifier P1 includes a non-inverting terminal e1, an inverting terminal f1, and an output terminal g1. The feedback capacitor Cf and the fourth switch K4 are connected in parallel between the inverting terminal e1 and the output terminal g1, and the fourth switch K4 is used to turn on and off at a predetermined time interval, and plays a role in resetting the charges at both ends of the feedback capacitor Cf. The non-inverting terminal e1 is connected to the second signal processing circuit 233. The inverting terminal f1 is further connected to the transmission terminal b, or the inverting terminal f1 is further used as the transmission terminal b. The output terminal g1 is connected to the processing unit 235.

[0191] When performing touch detection, the first operational amplifier P1 is in a virtual short state, and the touch sensing drive signal output by the second signal processing circuit 233 is output to the data line 103 through the in-phase terminal e1 and the inverting terminal f1, and then output to the first electrode 101 through the activated control switch 104, driving the first electrode 101 to perform self-capacitance touch sensing. When a finger touches the first electrode 101, the first electrode 101 outputs a corresponding touch sensing detection signal to the inverting terminal f1 through the data line 103, and the touch sensing detection signal is converted or processed by the charge of the feedback capacitor Cf, and a signal related to the touch sensing detection signal is generated at the output terminal g1. Among them, the size relationship between the feedback capacitor Cf and the contact capacitor determines the amplitude change of the signal generated at the output terminal g1.

[0192] The processing unit 235 includes an analog-to-digital signal conversion unit 2351 and a calculation unit 2355. The analog-to-digital signal conversion unit 2351 performs analog-to-digital conversion on the signal output from the output terminal g1 of the touch sensing detection unit 232, and outputs the converted digital signal to the calculation unit 2355. The calculation unit 2355 calculates the touch coordinates according to the digital signal. The calculation unit 2355 is connected to a main control chip 3, and is used to output a signal indicating the 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.

[0193] It should be noted that Fig.10 The touch sensing detection unit 232 and the processing unit 235 shown are structures of an embodiment of the present invention and are not limiting. It is possible to change that in other embodiments, the touch sensing detection unit 232 and the processing unit 235 may also be other suitable structures. For example, it is also possible to add corresponding circuit modules or omit some circuit modules in the touch sensing detection circuit 2013 (specifically, such as the touch sensing detection unit 232 and the processing unit 235), or it is also possible to use other circuit modules or circuit units to achieve the same function. Specifically, for example, a filtering unit is further included between the analog-to-digital signal conversion unit 2351 and the output terminal g1, and the filtering unit performs filtering processing on the signal output from the output terminal g1 and then outputs the filtered signal to the analog-to-digital signal conversion unit 2351.

[0194] For another example, a level conversion unit may be further provided between the calculation unit 2355 and the analog-digital signal conversion unit 2351, and the level conversion unit is used to perform level conversion on the digital signal output by the analog-digital signal conversion unit 2351, and output the digital signal after level conversion to the calculation unit 2355. The calculation unit 2355 calculates and obtains the touch coordinates according to the digital signal after level conversion. For another example, the calculation unit 2355 and the level conversion unit are interchanged, and accordingly, the analog-digital signal conversion unit 2351 outputs the converted digital signal to the calculation unit 2355. The calculation unit 2355 calculates and obtains the touch coordinates according to the digital signal, and outputs the signal indicating the touch coordinates to the level conversion unit, and the level conversion unit performs level conversion on the received signal indicating the touch coordinates, and then outputs it to the main control chip 3, which is also possible and needs to be determined according to the withstand voltage of the calculation unit 2355 and the analog-digital signal conversion unit 2351.

[0195] Please refer to Figure 3 Typically, the drive circuit 20 (similar to the following Fig.13The driving circuit 50 shown in the figure further includes a display processing circuit (not shown) and the level conversion unit (not shown), the display processing circuit is used to perform relevant processing (such as storage, decompression, color conversion, etc.) on the display data from the main control chip 3, and output the processed display data to the data driving circuit 2033 through the control circuit 205. The data driving circuit 2033 converts the display data into corresponding grayscale voltages. The level conversion circuit is used to perform level conversion on certain signals in the driving circuit 20. For example, in addition to the level conversion of the signal indicating the touch coordinates output by the calculation unit 2355, it is also possible to perform level conversion on the display data output by the display processing circuit, and then output the level-converted display data to the control circuit 205 to meet the signal transmission requirements between different withstand voltage circuit devices. The display data is preferably a digital signal.

[0196] Please refer to Fig.10 and Fig. 9 The touch sensing detection circuit 2013 may further include a third switch K3 connected between the transmission terminal b and the touch sensing detection unit 232 .

[0197] After the touch sensing control circuit 2011 provides the touch sensing control signal to the scan line 102 and before providing the touch sensing drive signal to the first electrode 101 to perform self-capacitance touch sensing, the drive circuit 201 further controls the third switch K3 to be disconnected so that the first electrode 101 connected to the same touch sensing detection unit 232 is short-circuited for a predetermined time.

[0198] After the driving circuit 20 controls the third switch K3 to be opened for the predetermined time, it controls the third switch K3 to be closed and provides a predetermined voltage to the short-connected first electrode 101. After the short-connected first electrode 101 reaches the predetermined voltage, the touch sensing detection circuit 2013 starts to perform self-capacitance touch sensing on the first electrode 101. Thus, the effect of reducing power consumption can be achieved.

[0199] Alternatively, after the first electrode 101 is short-circuited for a predetermined time, the step of providing a predetermined voltage to the short-circuited first electrode 101 may be omitted, and a touch sensing driving signal may be directly provided to the first electrode 101 to perform self-capacitive touch sensing.

[0200] For example, the control circuit 205 is used to control the closing and opening of the third switch K3. In addition, the third switch K3 is formed on the touch display panel 10 or in a chip. When formed on the touch display panel 10, the third switch K3 and the control switch 104 are formed together on the second substrate 107 of the touch display panel 10 (the second substrate 107 is shown in FIG. 1 ). Figure 4).

[0201] Please refer to Figure 3 The driving circuit 20 further includes a first switch unit 208 and a second switch unit 209. The first switch unit 208 is arranged between the data driving circuit 2033 and the plurality of data lines 103, and is used to control whether the data driving circuit 2033 is electrically connected to the plurality of data lines 103. The first switch unit 208 includes a plurality of first switches K1, and each data line 103 is connected to the data driving circuit 2033 through a first switch K1. The second switch unit 209 is arranged between the touch sensing detection circuit 2013 and the plurality of data lines 103, and is used to control whether the touch sensing detection circuit 2013 is electrically connected to the plurality of data lines 103. The second switch unit 209 includes a plurality of second switches K2, and each data line 103 is connected to the touch sensing detection circuit 2013 through a second switch K2.

[0202] Furthermore, the plurality of first switches K1 and the plurality of second switches K2 are, for example, controlled by the control circuit 205 to be closed or opened. In addition, the first switch unit 208 and the second switch unit 209 are either formed on the touch display panel 10 or formed in a chip. When formed on the touch display panel 10, the first switch unit 208, the second switch unit 209 and the control switch 104 are, for example, formed together on the second substrate 107 of the touch display panel 10 (the second substrate 107 is shown in FIG. 1 ). Figure 4 ).

[0203] Please refer to Figure 3 The driving circuit 20 further includes a selection circuit 210. The selection circuit 210 is connected between the scanning driving circuit 2031, the touch sensing control circuit 2011 and the scanning lines 102, and is used to select whether to output a scanning signal or a touch sensing control signal to the plurality of scanning lines 102.

[0204] In this embodiment, the selection circuit 210 includes a plurality of OR gates M. Each OR gate M includes a first input terminal h, a second input terminal i, and an output terminal j. The first input terminals h of the plurality of OR gates M are connected to the scan driving circuit 2031, the second input terminals i of the plurality of OR gates M are used to connect to the output terminal a of the touch sensing control circuit 2011, and the output terminals j of the plurality of OR gates M are connected to the plurality of scan lines 102 in a one-to-one correspondence.

[0205] The plurality of OR gates M are, for example, divided into a plurality of groups, at least one group comprising at least two OR gates M, and the second input terminals i of the at least two OR gates M are connected to each other and to an output terminal a.

[0206] Alternatively, the selection circuit 210 may also include other suitable output circuits such as logic gate circuits, and is not limited to the OR gate M described in this embodiment. In addition, similar to the first switch unit 208 being provided between the data driving circuit 2033 and the plurality of data lines 103, and the second switch unit 209 being provided between the touch sensing detection circuit 2013 and the plurality of data lines 103, a switch unit may be provided between the scanning driving circuit 2031 and the scanning line 102, and another switch unit may be provided between the touch sensing control circuit 2011 and the scanning line 102, so as to achieve the purpose of controlling whether the scanning driving circuit 2031 outputs a scanning signal to the scanning line 105 or the touch sensing control circuit 2011 outputs a touch sensing control signal to the scanning line 102. Preferably, the control circuit 205 is used to further control whether the scanning driving circuit 2031 outputs a scanning signal to the scanning line 102 or the touch sensing control circuit 2011 outputs a touch sensing control signal to the scanning line 102.

[0207] Furthermore, the selection circuit 210 is formed on the touch display panel 10 or in a chip. When formed on the touch display panel 10 , the selection circuit 210 and the control switch 104 are formed together on the second substrate 107 of the touch display panel 10 , for example.

[0208] See also Fig.11 , Fig.11 Schematic diagram of a partial circuit structure of an embodiment of a touch display device 1. For the sake of clarity, simplicity, emphasis, and comparison with the circuit of another embodiment below, Fig.11 Only a part of the data driving circuit 2033 and the touch sensing detection circuit 2013 connected to a group of data lines 103 is shown. The data driving circuit 2033 includes a first signal processing circuit 240 and a plurality of output units 241. The first signal processing circuit 240 is used to provide a grayscale voltage. Each output unit 241 includes a second operational amplifier P2. The second operational amplifier P2 includes a non-inverting terminal e2, an inverting terminal f2, and an output terminal g2. The inverting terminal f2 is connected to the output terminal g2, and the output terminal g2 is further connected to the data line 103 through the first switch K1. The non-inverting terminal e2 is connected to the first signal processing circuit 240 for receiving the grayscale voltage.

[0209] In addition, each data line 103 is further connected to the inverting terminal f1 of the first operational amplifier P1 through the second switch K2 and the third switch K3 .

[0210] When performing image display refresh, the second switch K2 and the third switch K3 are disconnected, and the first switch K1 is closed, so that the second operational amplifier P2 is electrically connected to the data line 103, and the second operational amplifier P2 outputs a grayscale voltage to the first electrode 101 through the data line 103 to perform image display refresh.

[0211] When performing touch sensing, the second switch K2 is first closed for a predetermined time, and the first electrodes 101 of the same group are short-circuited with each other; then the third switch K3 connected between each second switch K2 and the first operational amplifier P1 is closed. After the third switch K3 is closed, for example, a predetermined voltage is provided to the first electrode 101 for charging, and then a touch sensing drive signal is provided to the first electrode 101 to perform self-capacitance touch sensing. It should be noted that a predetermined voltage can also be provided to the first electrode 101 for discharge, and it is not limited to charging only. In addition, the multiple third switches K3 can also be omitted, and accordingly, the aforementioned steps of short-circuiting the first electrode 101 and then providing a predetermined voltage are also omitted, which is also possible.

[0212] See also Fig.12 , Fig.12 FIG. 1 is a schematic diagram of a partial circuit structure of another embodiment of the touch display device 1. Fig.13 The main differences in the partial circuit structures shown are: Fig.12 The touch sensing detection unit 232 shown shares an operational amplifier with the output unit 241 of the data driving circuit 2033. The data driving circuit 2033 further includes a seventh switch K7. Each touch sensing detection unit 232 further includes a fifth switch K5 and a sixth switch K6. The first operational amplifier P1 of the touch sensing detection unit 232 is a second operational amplifier P2 of the time-division multiplexing data driving circuit 2033. The first signal processing circuit 240 is connected to the in-phase terminal e2 through the seventh switch K7. The second signal processing circuit 233 is connected to the in-phase terminal e2 through the sixth switch K6. The fifth switch K5 is connected between the output terminal g2 of the second operational amplifier P2 and the processing unit 235. The third switch K3 is connected between the inverting terminal f2 and the third second switch K2. The fourth switch K4 and the feedback capacitor Cf are connected between the inverting terminal f2 and the output terminal g2. The output terminal g2 is connected to the data line 103 through the first switch K1.

[0213] When performing image display refresh, the control circuit 205 (see Figure 3) controls the first switch K1 to be turned on, the second switch K2 to be turned off, the third switch K3 to be turned off, the fourth switch K4 to be turned on, the fifth switch K5 to be turned off, the sixth switch K6 to be turned off, and the seventh switch K7 to be turned on; when performing touch sensing, the control circuit 205 controls the first switch K1 to be turned off, the second switch K2 to be turned on, the third switch K3 to be turned on after a predetermined time, the fourth switch K4 to be turned on and off alternately, the fifth switch K5 to be turned on, the sixth switch K6 to be turned on, and the seventh switch K7 to be turned off.

[0214] Since the data driving circuit 2033 and the touch sensing detection circuit 2013 share an operational amplifier, product cost can be saved.

[0215] The stage in which the first electrode 101 performs self-capacitive touch sensing is defined as the touch sensing stage, and the stage in which the first electrode 101 performs image display refresh is defined as the image display refresh stage. Preferably, the touch display panel 10 implements the touch sensing stage and the image display refresh stage in a time-sharing manner.

[0216] Please refer to Figure 3 , the working principle of the touch display device 1 is as follows:

[0217] The driving circuit 20 is connected to the multiple first electrodes 101 through wires in the following manner: in the image display refresh stage, the multiple first electrodes 101 are electrically connected to the display driving circuit 203, receive the grayscale voltage from the display driving circuit 203, and perform image display refresh; in the touch sensing stage, the multiple first electrodes 101 are electrically connected to the touch driving circuit 201, receive the touch sensing driving signal from the touch driving circuit 201, and perform self-capacitance touch sensing.

[0218] For example, in one embodiment, the same first electrode 101 is electrically connected to the touch sensing detection circuit 2013 in the touch driving circuit 201 and the data driving circuit 2033 in the display driving circuit 203 at different times. Furthermore, the same first electrode 101 is electrically connected to the touch sensing control circuit 2011 in the touch driving circuit 201 and the scan driving circuit 2031 in the display driving circuit 203 at different times or at different times.

[0219] Specifically, in a touch sensing stage, the touch driving circuit 201 provides a touch sensing driving signal to part of the first electrodes 101 to drive the part of the first electrodes 101 to perform self-capacitance touch sensing, until a touch sensing driving signal is provided to all the first electrodes 101 through a plurality of touch sensing stages performed sequentially to perform self-capacitance touch sensing on all the first electrodes 101; and

[0220] After each touch sensing phase ends, the display driving circuit 203 provides a grayscale voltage to the first electrode 101 at the end of the touch sensing phase, and drives the first electrode 101 to perform image display refresh.

[0221] The touch sensing phase and the image display refresh phase are performed alternately, for example.

[0222] When the touch display panel 10 performs touch sensing, the touch driving circuit 201, for example, drives at least two rows of first electrodes 101 at a time to perform self-capacitive touch sensing. Further, the touch driving circuit 201 can be to drive at least two rows of first electrodes 101 at a time to perform self-capacitive touch sensing. The at least two rows are adjacent rows or different rows. When the at least two rows are different rows, they are odd rows or even rows.

[0223] In addition, for a touch sensing stage, the touch driving circuit 201 can drive multiple rows of first electrodes 101 at a time to perform self-capacitive touch sensing, or can drive multiple rows of first electrodes 101 at a time to perform self-capacitive touch sensing. In the case where multiple rows of first electrodes 101 are driven at a time to perform self-capacitance, the first electrodes 101 driven at the times are arranged in sequence without overlapping each other, but the first electrodes 101 driven twice adjacently can also partially overlap. In addition, one row of first electrodes 101 can also be driven at a time, and it is not limited to at least two rows of first electrodes 101.

[0224] When the touch display panel 10 performs image display refresh, the display driving circuit 203 drives the first electrodes 101 row by row to perform image display refresh.

[0225] Further, in one embodiment, the driving circuit 20 is used to perform interlaced display refresh scanning and interlaced touch scanning on the plurality of first electrodes 101 to achieve image display refresh and touch sensing. Thus, the display refresh frequency and touch sensing frequency of the driving circuit 20 for the touch display panel 10 are the same, for example, both are 120 Hz. It should be noted that, for example, the display data is pre-converted from progressive to interlaced in the control circuit 205.

[0226] For a clearer understanding, an example is given to illustrate the process of image display refresh and touch sensing performed by the touch display panel 10 as follows:

[0227] 1. The first electrode 101 is displayed; for example, the previous frame is displayed and the next frame starts;

[0228] 2. The touch sensing stage begins in advance, short-circuiting the first electrodes 101 of the even-numbered rows 2, 4, ..., 52, and after the short-circuiting lasts for a predetermined time, connecting the first electrodes 101 of the 2, 4, ..., 52 rows to a predetermined level;

[0229] 3. Start to perform self-capacitive touch sensing on the first electrodes 101 of the even-numbered rows 2, 4, ..., 52;

[0230] 4. Refresh the display of the first electrodes 101 in the 2nd row, the 4th row, ..., the 52nd row after performing self-capacitive touch sensing;

[0231] 5. The next touch sensing phase begins in advance, short-circuiting the first electrodes 101 of the even-numbered rows 54, 56, ..., 106, and connecting the first electrodes 101 of the 54, 56, ..., 106 rows to a predetermined level after the short-circuiting lasts for a predetermined time;

[0232] 6. Start to perform self-capacitive touch sensing on the first electrodes 101 of the even rows, row 54, row 56, ..., row 106;

[0233] 7. Refresh the display of the first electrodes 101 in the 54th row, the 56th row, ..., the 106th row after performing self-capacitive touch sensing;

[0234] According to the above steps, the touch sensing and display refreshing of the first electrodes 101 of all even-numbered rows are completed. Next, similarly, the touch sensing and display refreshing of the first electrodes 101 of all odd-numbered rows are completed.

[0235] Alternatively, the scanning order of odd-numbered rows and even-numbered rows may be reversed.

[0236] However, the touch scanning and display refresh scanning of the present invention are not limited to the above steps, and other changes may also be made. For example, between two adjacent touch sensing stages, after completing the display refresh of the first electrode 101 executing the previous touch sensing stage, it is not necessary to start the next touch sensing stage immediately, and the display of other first electrodes 101 may be refreshed before starting the next touch sensing stage.

[0237] In addition, after completing self-capacitance touch sensing on all even (odd) rows of first electrodes 101, display refresh may be performed on all even rows of first electrodes 101; thereafter, self-capacitance touch sensing and display refresh may be performed on all odd (even) rows of first electrodes 101.

[0238] Furthermore, display refresh may be performed after self-capacitive touch sensing is completed for all first electrodes 101 .

[0239] Please refer to Figure 1The electronic device 100 further includes a main control chip 3. In addition, Fig.10 The main control chip 3 is also shown. The main control chip 3 is connected to the touch display device 1. The main control chip 3 is used to communicate data with the touch display device 1. The main control chip 3 is further used to provide 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 main control chip 3 is a chipset, the chipset includes an application processor (AP) and a power chip. In addition, the chipset may further include a memory chip. Furthermore, the application processor may also be a central processing unit (CPU).

[0240] The main control chip 3 includes a ground terminal 33, which is connected to the device ground and receives a ground signal of the device ground. Figure 1 Represented by GND. The device ground is also called system ground, for example, the negative pole of the power supply of the electronic device 100, such as a battery. The ground signal GND is also called system ground voltage, system ground signal, device ground voltage, or device ground signal, etc. The ground signal GND is a constant voltage, which serves as a voltage reference for each circuit in the electronic device 100. The ground signal GND is, for example, a voltage signal such as 0V (volts), 2V, (-1)V, etc. Usually, the device ground is not the earth or the absolute earth. However, when the electronic device 100 is connected to the earth through a conductor, the device ground may also be the earth.

[0241] The driving circuit 20 further includes a first ground terminal 251 and a second ground terminal 253 connected to each other. The second ground terminal 253 is connected to the ground terminal 33.

[0242] The touch display panel 10 further includes a grounding line 112, and the grounding line 112 is connected to the first ground terminal 251. However, alternatively, the grounding line 112 may also be directly connected to the device ground or the ground terminal 33 or the second ground terminal 253.

[0243] When the touch display device 1 performs image display refresh and touch sensing, the ground line 112 receives a ground signal GND.

[0244] In the above-mentioned embodiments, the electronic device 100 uses a domain as a voltage reference. The domain is a domain that uses the ground signal GND as a reference.

[0245] See also Fig.13 , Fig.13Schematic diagram of the structure of another embodiment of the electronic device of the present invention. The structure of the electronic device 400 can be substantially the same as that of the electronic device 100, for example, the structure of the touch display panel 40 is the same or similar to that of the touch display panel 10, the structure and working principle of the main control chip 6 are the same or similar to that of the main control chip 3, the connection relationship between the drive circuit 50 and the main control chip 6 is the same or similar to that between the drive circuit 20 and the main control chip 3, and the connection relationship between the drive circuit 50 and the touch display panel 40 is the same or similar to that between the drive circuit 20 and the touch display panel 10.

[0246] The main difference between the electronic device 400 and the electronic device 100 is that the structure and working principle of the driving circuit 50 of the touch display device 4 of the electronic device 400 are different from those of the driving circuit 20 of the touch display device 1 of the electronic device 100. When the touch display panel 40 performs touch sensing, the signal output by the driving circuit 50 to the touch display panel 40 is uniformly modulated as a whole to improve the signal-to-noise ratio.

[0247] Specifically, the driving circuit 50 further includes a modulation circuit 506 compared to the driving circuit 20. The modulation circuit 506 is used to generate a modulation signal, and the modulation signal is used to modulate the input signal provided by the touch driving circuit 501 to the touch display panel 40. The input signal changes with the change of the modulation signal. In this embodiment, the input signal increases with the increase of the modulation signal and decreases with the decrease of the modulation signal. However, it can be changed that in other embodiments, the change relationship between the input signal and the modulation signal can also be other suitable change relationships.

[0248] Due to the use of the modulation technology scheme, in addition to the newly added modulation circuit 506, some circuits or elements related to the modulation circuit 506 are also newly added in the driving circuit 50. In addition, some circuit structures in the driving circuit 50 are different from the circuit structures in the driving circuit 20 that implement the same or similar functions. This information can be obtained from the following description of this implementation method.

[0249] It should be noted that the same or similar structures in the electronic device 400 and the electronic device 100 are numbered differently. For example, the touch display panel 10 and the touch display panel 40 have the same or similar structures, but are numbered differently; the same or similar circuits in the drive circuit 50 and the drive circuit 20 are also numbered differently, and so on. This is just to make the numbers look more logical and regular, and does not limit the structures indicated by different numbers to be different. Accordingly, the same structures in the electronic device 400 as those in the aforementioned electronic device 100 are not described one by one here. The main differences between the electronic device 400 and the electronic device 100 are described below. Similarly, the foregoing also applies to the following electronic device 900.

[0250] The input signal includes the touch sensing control signal, a touch sensing driving signal, a second common voltage, and a third common voltage.

[0251] The amplitude variation of the touch sensing control signal, the touch sensing driving signal, the second common voltage, and the third common voltage is, for example, the same as the amplitude variation of the modulation signal.

[0252] The touch sensing control signal, the touch sensing drive signal, the second common voltage, and the third common voltage are all of the same amplitude and frequency as the modulation signal, for example, and the phases of the touch sensing control signal, the touch sensing drive signal, the second common voltage, and the third common voltage are all delayed to a certain extent relative to the phase of the modulation signal.

[0253] In this embodiment, the modulation signal is a periodically changing square wave pulse signal. However, in other embodiments, the modulation signal may also be a non-periodically changing signal, or may be a sine wave, trapezoidal wave or other suitable waveform signal.

[0254] In this embodiment, in the touch sensing stage, the modulation circuit 506 modulates the ground of part of the circuits in the touch driving circuit 501 and the ground of the touch display panel 40 to achieve overall uniform modulation of the input signal of the touch display panel 40. However, alternatively, in other embodiments, the modulation circuit 506 may also modulate the ground of all the circuits in the touch driving circuit 501 and the ground of the touch display panel 40, which will be described later.

[0255] In contrast, in the image display refresh phase, the ground of the display driving circuit 503 and the ground of the touch display panel 40 are not modulated, and both receive the ground signal GND.

[0256] More specifically, the driving circuit 50 further includes a voltage generating circuit 51, a plurality of signal transmission terminals 551 and a first power supply terminal 554. The voltage generating circuit 51 is connected to the modulation circuit 506 to provide a driving signal to the modulation circuit 506. The modulation circuit 506 is further connected between the first ground terminal 552 and the second ground terminal 553. The first ground terminal 552 is further connected to the ground line 412. The signal transmission terminal 551 is respectively connected to the common voltage generating circuit 507, the first switch unit 508, the selection circuit 510, and the second switch unit 509, and is used to output a grayscale voltage to the first electrode 401, output a touch sensing control signal to the scan line 402, output a touch sensing driving signal to the first electrode 401, output a first common voltage or a second common voltage or a third common voltage to the second electrode 405, and receive a touch sensing detection signal output from the first electrode 401. It should be noted that the signal transmission terminal 551 includes the output terminal a and the transmission terminal b of the driving circuit 20 of the aforementioned electronic device 100.

[0257] The main control chip 6 includes a power supply terminal 61 and a ground terminal 63. The ground terminal 63 is connected to the device ground and the second ground terminal 553. The power supply terminal 61 is connected to the first power terminal 554. A communication interface (not shown) is further provided between the main control chip 6 and the drive circuit 50 for information communication.

[0258] The main control chip 6 outputs a power supply voltage to the first power supply terminal 554 through the power supply terminal 61. The ground terminal 63 and the second ground terminal 553 both receive a ground signal GND from a device ground.

[0259] In the touch sensing stage, the modulation circuit 506 generates a modulation signal (in Fig.13The modulation signal MGND is output to the first ground terminal 552. The first ground terminal 552 outputs the modulation signal MNGD to the ground line 412. The drive signal is, for example, higher than the ground signal GND. For example, the ground signal GND is 0V and the drive signal is 2V. However, the ground signal being 0V and the drive signal being 2V is only an example, and the corresponding amplitude can be adjusted according to the product situation, and the present invention does not limit this. It is defined that during touch sensing, the ground (including the first ground terminal 552 and the ground line 412) loaded with the modulation signal MGND is the modulation ground to distinguish it from the device ground loaded with the ground signal GND. Alternatively, in other embodiments, the modulation circuit 506 may also directly output the modulation signal MGND to the ground line 412, without being limited to outputting the modulation signal MGND to the ground line 412 through the first ground terminal 552.

[0260] Accordingly, in the touch sensing stage, the electronic device 400 uses two domains as voltage references. The two domains are respectively shown as a domain 480 based on the ground signal GND and a domain 490 based on the modulation signal MGND. Among them, the ground ends of the circuits in the domain 480 based on the ground signal GND are directly connected to the device ground, and the ground ends of the circuits in the domain 490 based on the modulation signal MGND are directly connected to the modulation ground. Further, for the circuit using the modulation ground as the ground, its reference ground potential is the modulation signal MGND loaded by the modulation ground; for the circuit using the device ground as the ground, its reference ground potential is the ground signal GND loaded by the device ground.

[0261] That is, in the touch sensing stage, the modulation ground is modulated from the ground signal GND to the modulation signal MGND, and all signals taking the modulation signal MGND loaded on the modulation ground as a reference are modulated by the modulation signal MGND.

[0262] Further, in the image display refresh phase, the modulated ground (552, 412) is connected to the first active switch 561 (combined with Fig.13 and Fig.14 ) is electrically connected to the second ground terminal 553 connected to the device ground. At this stage, the second active switch 563 is in the off state. Accordingly, when the image display is refreshed, the modulation circuit 506 outputs the ground signal GND to the first ground terminal 552 and the ground line 412. Optionally, the modulation circuit 506 continuously outputs the ground signal GND to the first ground terminal 552 and the ground line 412. That is, when the image display is refreshed, the electronic device 400 actually uses a domain 480 based on GND.

[0263] Please refer to Fig.13, the driving circuit 50 further includes a display processing circuit 504 and a level conversion unit 5353. The display processing circuit 504 is connected to the main control chip 6, and is used to perform corresponding processing (such as compression, storage, decompression, color conversion, etc.) on the display data from the main control chip 6. The level conversion unit 5353 is arranged between the display processing circuit 504 and the control circuit 505, and is used to perform level conversion on the display data processed by the display processing circuit 504, and output the level-converted display data to the control circuit 505. The control circuit 505 outputs the corresponding display data and the timing signal to the display driving circuit 503. The display driving circuit 503 converts the received display data into a grayscale voltage, and outputs the grayscale voltage to the corresponding first electrode 101 through the first switch unit 508 according to the timing signal to perform image display refresh. The display data is preferably a digital signal.

[0264] It should be noted that when the modulation ground scheme is not adopted, if the signal between the display processing circuit 504 and the control circuit 505 does not need level conversion, then there is no need to set a level conversion unit between the display processing circuit 504 and the control circuit 505. However, in the modulation ground technical scheme, since the voltage reference benchmarks of domain 480 and domain 490 are different, level conversion is required.

[0265] The level conversion unit 5353 is further arranged between the calculation unit 5355 and the analog-to-digital signal conversion unit 5351, and is used to perform level conversion on the digital signal output by the analog-to-digital signal conversion unit 5351, and output the digital signal after level conversion to the calculation unit 5355 to obtain the touch coordinates.

[0266] In this embodiment, the circuit modules or circuit units in the driving circuit 50 are divided into two domains 480 and 490 as follows: the touch sensing control circuit 5011, the selection circuit 510, the touch sensing detection unit 532, the second signal processing circuit 533, the analog-to-digital signal conversion unit 5351, the third switch K3, the second switch unit 509, the control circuit 505, the display driving circuit 503, the first switch unit 508, the common voltage generating circuit 507, and the touch display panel 40 are all divided into In domain 490 based on MGND; the modulation circuit 506, the display processing circuit 504, the calculation unit 5355, and the voltage generating circuit 51 are all divided in domain 480 based on GND; the level conversion unit 5353 spans two domains, that is, one part is in domain 480 and the other part is in domain 490. For a person skilled in the art, according to the records of this application and the circuit principle, it can be determined that the level conversion unit 5353 is respectively located in the parts of domain 480 and domain 490, which will not be repeated here.

[0267] The specific structure, connection relationship and function of the circuit modules or circuit units in the driving circuit 50 and the driving circuit 20 with the same names are not described here in detail. For details, please refer to the aforementioned driving circuit 20. Fig.13 Only a part of the touch sensing detection circuit (not shown) is shown. In fact, the touch sensing detection circuit includes a plurality of touch sensing detection units 532, a plurality of third switches K3, a plurality of analog-digital signal conversion units 5351, and a plurality of calculation units 5355. For the corresponding information, please refer to the aforementioned touch sensing detection circuit 2013.

[0268] Alternatively, the present invention may divide the driving circuit 50 into the above two domains 480 and 490 in a variety of ways and is not limited to the above embodiments. For example, in other embodiments, the control circuit 505, the display driving circuit 503, and the analog-to-digital signal conversion unit 5351 may also be set in the domain 480.

[0269] For another example, the calculation unit 5355 may also be arranged in the domain 490. It should be noted that when the calculation unit 5355 is arranged in the domain 490, and the digital signal outputted to the calculation unit 5355 by the analog-digital signal conversion unit 5351 needs to be level-converted, the level conversion unit for level-converting the digital signal may also be completely arranged in the domain 490. Accordingly, as described above, the modulation circuit 506 modulates the ground of all circuits in the touch driving circuit 501 and the ground of the touch display panel 40.

[0270] It should be further explained that the signal output from domain 480 to domain 490 will be modulated by the modulation signal MGND. Correspondingly, the signal output from domain 490 to domain 480 will also be modulated accordingly, such as the modulation opposite to the modulation signal MGND.

[0271] Since the input signal of the touch display panel 40 when performing touch sensing is modulated uniformly by the modulation signal MGND, the signal-to-noise ratio of the touch display device 4 can be improved, thereby improving the touch sensing accuracy.

[0272] See also Fig.14 , Fig.14 for Fig.13Schematic diagram of an embodiment of a modulation circuit 506 shown in FIG. The modulation circuit 506 includes a first active switch 561, a second active switch 563, and a control unit 565. The first active switch 561 includes a control terminal G1, a first transmission terminal S1, and a second transmission terminal S2, and the second active switch 563 includes a control terminal G2, a first transmission terminal S3, and a second transmission terminal S4. The control terminals G1 and G2 are both connected to the control unit 565. The second transmission terminal S2 of the first active switch 561 is connected to the first transmission terminal S3 of the second active switch 563, and an output node N is defined on the connection line. The first transmission terminal S1 of the first active switch 561 receives a first reference signal, and the second transmission terminal S4 of the second active switch 563 receives a second reference signal. The control unit 565 controls the first and second active switches 561 and 563 to alternately output the first reference signal and the second reference signal through the output node N to form a modulation signal.

[0273] In this embodiment, the first reference signal is a ground signal, and the second reference signal is a driving signal. Accordingly, the second transmission terminal S4 is connected to the voltage generating circuit 51 , the first transmission terminal S1 is connected to the second ground terminal 553 , and the node N is connected to the first ground terminal 552 .

[0274] The first active switch 561 and the second active switch 563 are, for example, thin film transistors, triodes, or metal oxide semiconductor field effect transistors.

[0275] The working principle of the modulation circuit 506 is: in the touch sensing stage, the control unit 565 is used to control the modulation circuit 506 to output the modulation signal MGND to the first ground terminal 552; in the image display refresh stage, the control unit 565 is used to control the modulation circuit 506 to output the ground signal GND to the first ground terminal 552.

[0276] It should be noted that the first reference signal and the second reference signal are not limited to those described in this embodiment, and the voltage conditions of the first reference signal and the second reference signal can be any one of the following five conditions:

[0277] First: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V;

[0278] Second: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is a negative voltage;

[0279] Third: the voltage of the first reference signal is a positive voltage, the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal;

[0280] Fourth: the voltages of the first reference signal and the second reference signal are positive voltages of different magnitudes;

[0281] Fifth: the voltages of the first reference signal and the second reference signal are negative voltages of different magnitudes.

[0282] The first reference signal and the second reference signal are, for example, both constant voltage signals. The modulation signal is a periodically changing square wave signal in which the first reference signal and the second reference signal appear alternately.

[0283] In addition, the circuit structure of the modulation circuit 506 is not limited to the above-mentioned embodiment, and may also be other suitable circuit structures.

[0284] It should be further explained that, for the touch display device 1, the electronic device 100 has only one reference domain based on the ground signal GND, and the principle of the touch driving circuit 201 when driving the touch display panel 10 to perform touch sensing is the self-capacitance touch sensing principle; for the touch display device 4, the electronic device 400 has a reference domain based on the ground signal GND and a reference domain based on the modulation signal MGND, and the principle of the touch driving circuit 501 when driving the touch display panel 40 to perform touch sensing is also the self-capacitance touch sensing principle.

[0285] When the electronic device 400 uses two domains 480 and 490 based on GND and MGND, not only the input signal of the touch display panel 40 is uniformly modulated as a whole to improve the signal-to-noise ratio, but also some circuit structures of the touch drive circuit 501 in the domain 490 are simplified accordingly, thereby simplifying the circuit structure and saving product costs. For example, the second signal processing circuits 233 and 533 are used as examples for explanation.

[0286] See also Fig.15 and Fig.16 , Fig.15 A schematic diagram of a circuit structure of an embodiment of the second signal processing circuit 233 when the electronic device 100 only uses one domain based on GND, Fig.16A schematic diagram of the circuit structure of an embodiment of the second signal processing circuit 533 when the electronic device 400 uses two domains 480 and 490 based on GND and MGND. The second signal processing circuit 233 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 VDD1 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 in-phase terminal e1. One end of the second switch K2a is connected between the first switch K1a and the in-phase terminal e1, and the other end is connected to the device ground for loading the ground signal GND. By controlling the alternating conduction of the first switch K1a and the second switch K2a, a touch sensing drive signal is generated to the in-phase terminal e1. The power supply terminal VDD1 is kept constant relative to the device ground GND. The power supply terminal VDD1 is, for example, the first power supply terminal 554, but is not limited to the first power supply terminal 554, and can also be other suitable power supply terminals.

[0287] In contrast, the second signal processing circuit 533 includes a current source Ib and a resistor Rb, and the current source Ib and the resistor Rb are connected in series between the power supply terminal VDD2 and the modulation ground for loading the modulation signal MGND. The in-phase terminal e1 is connected between the current source Ib and the resistor Rb. The power supply terminal VDD2 is, for example, the second power supply terminal 555 described later. Since the modulation signal MGND on the modulation ground is variable, the output voltage between the power supply terminal VDD2, the current source Ib and the resistor Rb varies with the change of the modulation signal MGND on the modulation ground, thereby generating a touch sensing drive signal to the in-phase terminal e1. In addition, a capacitor may be added between the modulation ground MGND and the power supply terminal VDD2 to maintain signal stability.

[0288] Compared with the second signal processing circuit 233 , the structure of the second signal processing circuit 533 becomes simpler, and the touch sensing driving signal generated by the second signal processing circuit 533 is more stable than the touch sensing driving signal generated by the second signal processing circuit 233 .

[0289] Please refer to Fig.13 The driving circuit 50 further includes a slope controller 55. The slope controller 55 is connected to the modulation circuit 506 and is used to control the slope of the modulation signal output by the modulation circuit 506 to reduce electromagnetic interference (EMI). In addition, the slope controller 55 is, for example, set in the domain 480 based on GND.

[0290] Please refer to Fig.13In this embodiment, since part of the driving circuit 50 is in the domain 480 based on GND and part of it is in the domain 490 based on MGND, there is a possibility that the current in the domain 490 will be fed back to the domain 480. In order to prevent this phenomenon, the electronic device 400 further includes a protection circuit 53, which is arranged between the domain 480 and the domain 490.

[0291] Specifically, the driving circuit 50 further includes a second power supply terminal 555 in the domain 490. The protection circuit 53 is arranged between the first power supply terminal 554 and the second power supply terminal 555. When the modulation signal MGND is a driving signal, the protection circuit 53 correspondingly disconnects the connection between the first power supply terminal 554 and the second power supply terminal 555; when the modulation signal MGND is a ground signal GND, the protection circuit 53 correspondingly closes the connection between the first power supply terminal 554 and the second power supply terminal 555.

[0292] See also Fig.17 , Fig.17 Schematic diagram of the protection circuit 53. In this embodiment, the protection circuit 53 includes a diode D1. The anode of the diode D1 is connected to the first power supply terminal 554, and the cathode of the diode D1 is connected to the second power supply terminal 555.

[0293] Preferably, the protection circuit 53 further includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected between the anode of the diode D1 and the device ground loaded with the ground signal GND, and the second capacitor C2 is connected between the cathode of the diode D1 and the modulation ground loaded with the modulation signal MGND. The first capacitor C1 and the diode D1 are arranged in the domain 480, and the second capacitor C2 is arranged in the domain 490.

[0294] The protection circuit 53 is not limited to the above embodiments, for example, see Fig.18 , Fig.18 This is a schematic diagram of another embodiment of the protection circuit 53. Fig.17 The protection circuit 53 shown, Fig.18The protection circuit shown is marked as 53a. The protection capacitor 53a includes a third active switch 571 and a control unit 573. The third active switch 571 includes a control terminal G3, a first transmission terminal S5, and a second transmission terminal S6. The control terminal G3 of the third active switch 571 is connected to the control unit 573, the first transmission terminal S5 is connected to the first power terminal 554, and the second transmission terminal S6 is connected to the second power terminal 555. When the modulation signal MGND is a driving signal, the control unit 573 controls the third active switch 571 to be turned off, and the protection circuit 53a correspondingly disconnects the connection between the first power terminal 554 and the second power terminal 555; when the modulation signal MGND is a ground signal GND, the control unit 573 controls the third active switch 571 to be turned on, and the protection circuit 53a correspondingly closes the connection between the first power terminal 554 and the second power terminal 555. The third active switch 571 is, for example, a thin film transistor, a triode, or a metal oxide semiconductor field effect transistor.

[0295] In addition, preferably, the protection circuit 53a further includes a first capacitor C1 and a second capacitor C2, wherein the first capacitor C1 is connected between the first transmission terminal S5 and the device ground loaded with the ground signal GND, and the second capacitor C2 is connected between the second transmission terminal S6 and the modulation ground loaded with the ground signal MGND.

[0296] It is particularly important to note that, when performing touch sensing, the modulation technique is also applicable to other suitable types of touch display panel structures, and is not limited to the structure of the touch display panel 40. Fig.19 The self-capacitive touch screen (not shown) shown in the figure comprises a plurality of first electrodes 401, each of which is connected to a driving circuit (not shown) via a separate data line 403, that is, saving Fig.13 The control switch 404 and the scan line 402 in the touch display panel 40 are shown, but the number of data lines 403 needs to be increased, and each first electrode 401 is separately connected to a data line 403. In addition, the size of the first electrode 401 becomes larger. In this way, the modulation ground scheme can also improve the sensing accuracy of the touch display device including the self-capacitive touch display screen.

[0297] Alternatively, in other embodiments, the modulation circuit 506 can also modulate the power supply or reference power supply in the driving circuit 50 to achieve overall uniform modulation of the input signal of the touch display panel 40, rather than limiting the modulation of the device ground. For example, one end of the modulation circuit 506 used to output the modulated signal is the modulation end. In addition to being connected to or used as the aforementioned first ground terminal 552 (when modulating the ground), the modulation end can also be connected to or used as the aforementioned second power supply end 555 (when modulating the power supply). When connected or used as the second power supply end 555, the modulation circuit 506 is connected between the first power supply end 554 and the second power supply end 555. The second power supply end 555 is also called the power supply end relative to the first ground terminal 552, and the voltages loaded by the two remain constant.

[0298] In addition, in addition to the second power supply terminal 555 and the first ground terminal 552, the driving circuit 50 generally includes a reference power supply terminal (not shown). When the second power supply terminal 555 is used to load the first power supply voltage and the first ground terminal 552 is used to load the second power supply voltage, the reference power supply terminal is used to load the third power supply voltage, and the third power supply voltage is between the first power supply voltage and the second power supply voltage, wherein the voltage difference between the first power supply voltage and the second power supply voltage remains constant, and the voltage difference between the first power supply voltage and the third power supply voltage remains constant. The reference power supply terminal can also be used as or connected to the modulation terminal. That is, one of the power supply terminal, the reference power supply terminal, and the first ground terminal is used as or connected to the modulation terminal, and correspondingly, the power supply voltage used as or connected to the modulation terminal includes a modulation signal.

[0299] Accordingly, in the image display refresh stage, a constant voltage is loaded on the modulation end, and the driving circuit 50 provides a grayscale voltage to the multiple first electrodes 401 through the signal transmission end 551, driving the first electrodes 401 to perform image display; in the touch sensing stage, the modulation end is loaded with a modulation signal, and the driving circuit 50 provides a touch sensing drive signal to the multiple first electrodes 401 through the signal transmission end 551, driving the first electrodes 401 to perform self-capacitance touch sensing, wherein the touch sensing drive signal increases with the increase of the modulation signal and decreases with the decrease of the modulation signal.

[0300] The control unit 565 (see Fig.14 ) is used to control the modulation circuit 506 to output the constant voltage to the modulation end during the image display refresh phase; and to control the modulation circuit 506 to output the modulation signal to the modulation end during the touch sensing phase.

[0301] See also Fig. 20 , Fig. 20: is a structural schematic diagram of the common voltage generating circuit 507. The common voltage generating circuit 507 includes a first circuit 5071, a second circuit 5072, and a third circuit 5073. The first circuit 5071 is used to generate a first common voltage, the second circuit 5072 is used to generate a second common voltage, and the third circuit 5073 is used to generate a third common voltage. The ground end of the first circuit 5071 is connected between the modulation circuit 506 and the first ground end 552. The ground end of the second circuit 5072 is connected between the modulation circuit 506 and the first ground end 552. The ground end of the third circuit 5073 is connected between the modulation circuit 506 and the first ground end 552.

[0302] In the image display refresh stage, the first circuit 5071 is further electrically connected to the second electrode 405 to provide a first common voltage to the second electrode 405. It should be noted that although the ground terminal of the first circuit 5071 is connected between the modulation circuit 506 and the first ground terminal 552, the modulation circuit 506 only outputs the ground signal GND to the first ground terminal 552 in this stage; in the touch sensing stage and when the touch display device 4 is in the bright screen working state, the second circuit 5072 is further electrically connected to the second electrode 405 to provide a second common voltage to the second electrode 405; in the touch sensing stage and when the touch display device 4 is in the black screen standby state, the third circuit 5073 is electrically connected to the second electrode 405 to provide a third common voltage to the second electrode 405. It should be noted that in the touch sensing stage, the modulation circuit 506 outputs the modulation signal MGND to the first ground terminal 552.

[0303] When the first common voltage is a constant voltage, the first circuit 5071 and the second circuit 5072 can be the same circuit accordingly. Because when the image display is refreshed, the first circuit 5071 is actually connected to the device ground, and when touch sensing is performed, it is connected to the modulation ground. Therefore, when the image display is refreshed, the first circuit 5071 outputs a constant first common voltage, and when touch sensing is performed, the constant first common voltage is modulated by the modulation signal MGND and becomes a correspondingly variable second common voltage, and the voltage difference between the second common voltage and the touch sensing drive signal remains unchanged. In this way, the second circuit 5072 can be saved.

[0304] Similarly, the third circuit 5073 and the second signal processing circuit 533 are preferably the same circuit. In this way, the third circuit 5073 is further saved.

[0305] Please refer to Fig. 20The common voltage generating circuit 507 further includes an eighth switch K8, a ninth switch K9, and a tenth switch K10. The first circuit 5071 is connected to the second electrode 405 through the eighth switch K8, the second circuit 5072 is connected to the second electrode 405 through the ninth switch K3, and the third circuit 5073 is connected to the second electrode 405 through the tenth switch K10. By controlling whether the eighth switch K8, the ninth switch K9, and the tenth switch K10 are turned on or off, it is correspondingly controlled which common voltage is output to the second electrode 405.

[0306] Alternatively, the second common voltage may also be a modulation signal. Accordingly, the second circuit 5073 includes a ninth switch K9 connected between the second electrode 405 and the first ground terminal 552 .

[0307] When the first circuit 5071 and the second circuit 5072 are the same circuit, accordingly, one of the eighth switch K8 and the ninth switch K9 can be saved.

[0308] See also Fig.21 , Fig.21 4 is a diagram showing the connection relationship between the second circuit 5072 and the second electrode 405. The second circuit 5072 includes a buffer R connected between the second electrode 405 and the first ground terminal 552.

[0309] Preferably, the second circuit 5072 includes a plurality of buffers R, which are respectively connected to different positions between the second electrode 405 and the first ground terminal 552. For example, they are evenly spaced around the second electrode 405, but are not limited to being evenly spaced. Thus, the stability of the second common voltage is ensured. It should be noted that, in this embodiment, no other components are connected between the buffer R and the first ground terminal 552. However, it can be changed that in other embodiments, a voltage generating circuit is connected between the buffer R and the first ground terminal 552, and the voltage generated by the voltage generating circuit increases with the increase of the modulation signal MGND and decreases with the decrease of the modulation signal MGND.

[0310] Similarly, the first circuit 5071 and the third circuit 5073 may also include a plurality of buffers R, which are respectively connected to different positions between the second electrode 405 and the first ground terminal 552 .

[0311] Please also refer to Fig.13 and Fig. 22 , Fig. 22 for Fig.13The structure diagram of the display processing circuit 504 is shown. The display processing circuit 504 includes a compression circuit 5035, a storage circuit 5037, a decompression circuit 5038, and a color conversion circuit 5039. The compression circuit 5035, the storage circuit 5037, the decompression circuit 5038, and the color conversion circuit 5039 are connected in sequence. The compression circuit 5035 is further connected to the main control chip 6 through a high-speed interface 5040. The color conversion circuit 5039 is further connected to the control circuit 505 through a level conversion unit 5353.

[0312] The compression circuit 5035 is used to receive display data from the main control chip 6 through the high-speed interface 5040, compress the received display data, and output the compressed display data to the storage circuit 5037. The storage circuit 5037 outputs the compressed display data to the decompression circuit 5038. The decompression circuit 5038 decompresses the received display data and outputs the decompressed display data to the color conversion circuit 5039. The color conversion circuit 5039 performs color conversion processing on the received display data, such as Gamma correction, and outputs the converted display data to the level conversion unit 5353. The level conversion unit 5353 performs level conversion on the received display data and outputs the level-converted display data to the control circuit 505.

[0313] The control circuit 505 outputs corresponding display data and timing signals to the data circuit 5033, and further outputs the timing signals to the scan driving circuit 5031. The scan driving circuit 5031 provides corresponding scan signals to the scan lines 402 according to the timing signals. The data driving circuit 5033 converts the received display data into grayscale voltages, and outputs corresponding grayscale voltages to the corresponding data lines 503 according to the timing signals, so as to perform image display refresh.

[0314] It should be noted that the display processing circuit 504 is not limited to the circuits described herein, and may not include some of the circuits or further include other circuits. For example, the compression circuit 5035 is disposed in the main control chip 6 instead of the display processing circuit 504 .

[0315] It should be noted that when the ground modulation method is adopted, the first electrode 401 is not limited to a pixel electrode, but can also be a common electrode. When the first electrode is a common electrode, the second electrode corresponds to a pixel electrode. Of course, the positions of these two types of electrodes should also be adjusted accordingly. When a common electrode is used as a self-capacitive touch sensing electrode, the drive circuit 50 provides a common voltage to the first electrode 401 to perform image display refresh. That is, when the ground modulation method is adopted, depending on whether the pixel electrode or the common electrode is used as the self-capacitive touch sensing electrode, the drive circuit 50 provides a corresponding display voltage to the first electrode 401 to perform image display refresh. Among them, the display voltage is a grayscale voltage or a common voltage.

[0316] Please refer to Figure 2 It should be understood that, for the multiple first electrodes 101 of the touch display surface 10, the touch sensing phase and the image display refresh phase are performed in time-sharing, that is, when one first electrode 101 performs touch sensing, another first electrode 101 performs image display refresh non-simultaneously. However, as mentioned above, when not all display electrodes 11 on the touch display panel 10 are used as first electrodes 101, the state of the display electrodes 11 not used as first electrodes 101 does not affect the definition of the above touch sensing phase and image display refresh phase. In other words, when in the touch sensing phase, the display electrodes 11 not used as first electrodes 101 can perform image display refresh. However, in this case, the display electrodes 11 not used as first electrodes 101 do not reuse the same data line 103 as the first electrodes 101.

[0317] Alternatively, in some embodiments, when one first electrode 101 performs touch sensing, another first electrode 101 may also perform image display refresh simultaneously. Accordingly, the number of control switches 104, scan lines 102, and data lines 103 needs to be further increased on the touch display panel 10. Fig.23 An electronic device 900 is shown.

[0318] See also Fig.23 , Fig.23It is a partial structural diagram of another embodiment of the electronic device of the present invention. The main difference between the electronic device 900 and the electronic device 100 of the above embodiment is that the number of scan lines 902 and 902a, data lines 903 and 903a, and control switches 904 and 904a of the touch display panel 90 of the electronic device 900 is more than the number of scan lines 102, data lines 103, and control switches 104 of the touch display panel 10 of the electronic device 100 of the above embodiment. In particular, the number of scan lines 902 and 902a, data lines 903 and 903a, and control switches 904 and 904a of the touch display panel 90 of the electronic device 900 is respectively twice the number of scan lines 102, data lines 103, and control switches 104 of the touch display panel 10 of the electronic device 100 of the above embodiment, and the number of data lines 903 of the touch display panel 90 of the electronic device 900 is preferably the same as the number of transmission terminals b of the touch sensing detection circuit (not shown).

[0319] Among them, the scan line 902a, the data line 903a, and the control switch 904a are all newly added components. The newly added scan line 902a, the newly added data line 903a and the newly added control switch 904a are respectively connected, and the newly added control switch 904 is connected to the first electrode 901. Accordingly, the newly added scan line 902a, the newly added data line 903a and the newly added control switch 904a are used to work when the first electrode 901 performs touch sensing, that is, the image display refresh and touch sensing of the touch display panel 90 reuse the first electrode 901, and do not reuse the scan line 902, the data line 903 and the control switch 904.

[0320] Due to the change in the structure of the touch display panel 90, when one first electrode 901 performs touch sensing, another first electrode 901 can simultaneously perform image display refresh. Accordingly, in this embodiment, the touch sensing phase and the image display refresh phase can be performed simultaneously or overlap in time. However, the structure of this embodiment can also realize the time-sharing execution of the touch sensing phase and the image display refresh phase.

[0321] Further, for the implementation method of performing the touch sensing phase and the image display refresh phase simultaneously, the common voltage of the second electrode 905 is a constant voltage. Of course, for the modulation scheme, the common voltage varies with the modulation signal.

[0322] However, in the above-mentioned embodiments of the present invention, it is preferred that the touch sensing phase and the image display refresh phase be performed in a time-sharing manner.

[0323] It should be noted that, for the modulation scheme, it is preferred that when one first electrode 901 performs touch sensing, another first electrode 901 performs image display refresh non-simultaneously, that is, for the modulation scheme, the touch display panel 90 preferably performs the image display refresh phase and the touch sensing phase in a time-sharing manner. More preferably, for the modulation scheme, all display electrodes of the touch display panel 90 are used as first electrodes.

[0324] Although the embodiments have been described herein with respect to specific configurations and sequences of operations, it should be understood that alternative embodiments may add, omit, or change elements, operations, etc. Therefore, the embodiments disclosed herein are meant to be examples rather than limitations.

Claims

1. A touch display device, comprising: Touch display panel, including: A first substrate and a second substrate are arranged opposite to each other; A display medium layer, located between the first substrate and the second substrate; A plurality of first electrodes, located between the second substrate and the display medium layer, for image display and touch sensing; and A second electrode is located between the first substrate and the second substrate; and a driving circuit, configured to provide a grayscale voltage to the plurality of first electrodes and provide a common voltage to the second electrodes so that the plurality of first electrodes and the second electrodes cooperate to perform image display, and further configured to provide a touch sensing driving signal to the plurality of first electrodes to perform self-capacitive touch sensing to obtain touch coordinates; When performing the self-capacitive touch sensing, the plurality of first electrodes are divided into a plurality of groups, and the first electrodes in the same group are connected in parallel with each other; when performing the image display, the plurality of first electrodes are connected in non-parallel.

2. The touch display device according to claim 1, wherein: The plurality of first electrodes are located in a same layer, and the second electrode is stacked with the plurality of first electrodes.

3. The touch display device according to claim 2, wherein: The second electrode is arranged between the plurality of first electrodes and the display medium layer, the plurality of first electrodes are located between the second electrode and the second substrate, and a hollow structure is arranged on the second electrode.

4. The touch display device according to claim 3, wherein: The area of ​​the region between adjacent hollow structures on the second electrode corresponding to the same first electrode is less than or equal to the area of ​​the hollow structure, and the edge of the region between adjacent hollow structures does not exceed the edge of the hollow structure.

5. The touch display device according to claim 3, wherein: A plurality of hollow structures corresponding to the same first electrode are arranged along a first direction, and along the first direction, a width of a region between adjacent hollow structures is less than or equal to a width of a hollow structure.

6. The touch display device according to claim 2, wherein: The second electrode is arranged between the plurality of first electrodes and the second substrate, the plurality of first electrodes are arranged between the display medium layer and the second electrode, and a hollow structure is arranged on the plurality of first electrodes.

7. The touch display device according to claim 6, wherein: The area of ​​the region between adjacent hollow structures on the same first electrode is greater than or equal to the area of ​​the hollow structure, and the edge of the region between the adjacent hollow structures does not exceed the edge of the hollow structure.

8. The touch display device according to claim 7, wherein: A plurality of hollow structures on the same first electrode are arranged along a first direction, and along the first direction, a width of a region between adjacent hollow structures is greater than or equal to a width of a hollow structure.

9. The touch display device according to any one of claims 2 to 8, characterized in that: The touch display panel is further provided on the second substrate: Multiple scan lines; A plurality of data lines are insulated and cross-arranged with the plurality of scanning lines; and A plurality of control switches, each control switch comprises a control electrode, a first transmission electrode, and a second transmission electrode, wherein the control electrode is connected to the scan line, the first transmission electrode is connected to the data line, and the second transmission electrode is connected to the first electrode.

10. The touch display device according to claim 9, wherein: The driving circuit comprises: a touch drive circuit, configured to provide a touch sensing control signal to the scan line, activate a control switch connected to the scan line, and output a touch sensing drive signal to the first electrode through the data line and the activated control switch to perform self-capacitive touch sensing; and The display driving circuit is used to provide a scanning signal to the scanning line, activate a control switch connected to the scanning line, and output a grayscale voltage to the first electrode through the data line and the activated control switch to perform image display.

11. The touch display device according to claim 10, wherein: The touch display device time-division multiplexes the plurality of scan lines, the plurality of data lines, the plurality of control switches, and the plurality of first electrodes to perform image display refresh and self-capacitive touch sensing.

12. The touch display device according to claim 10, wherein: The driving circuit further includes a control circuit for controlling whether the touch driving circuit drives the first electrode to perform self-capacitive touch sensing or the display driving circuit drives the first electrode to perform image display refresh.

13. The touch display device according to claim 10, wherein: The area of ​​the touch display panel used to display images and receive touch or proximity input from a target object is defined as a touch display area. The touch display panel further includes a first shielding electrode, which is located between the first substrate and the second substrate. The first shielding electrode partially or completely covers the data line located in the touch display area.

14. The touch display device according to claim 13, wherein: The driving circuit is connected to the first shielding electrode. When the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the first shielding electrode and the touch sensing driving signal remains unchanged.

15. The touch display device according to claim 13, wherein: The first shielding electrode is a common electrode.

16. The touch display device according to claim 13, wherein: The touch display panel further includes a second shielding electrode, which is located between the first substrate and the second substrate, and the second shielding electrode partially or completely covers the control switch located in the touch display area.

17. The touch display device according to claim 16, wherein: The driving circuit is connected to the second shielding electrode. When the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the second shielding electrode and the touch sensing driving signal remains unchanged.

18. The touch display device according to claim 16, wherein: The second shielding electrode is a common electrode.

19. The touch display device according to claim 13, wherein: The touch display panel further includes a fourth shielding electrode, wherein the fourth shielding electrode is located between the first substrate and the second substrate, and the fourth shielding electrode partially or completely covers the scan line located in the touch display area.

20. The touch display device according to claim 19, wherein: The driving circuit is connected to the fourth shielding electrode. When the first electrode performs touch sensing, the voltage difference between the voltage signal provided by the driving circuit to the fourth shielding electrode and the touch sensing driving signal remains unchanged, and the voltage difference between the touch sensing control signal and the touch sensing driving signal remains unchanged.

21. The touch display device according to claim 19, wherein: The fourth shielding electrode is a common electrode.

22. The touch display device according to claim 13, wherein: The area on the second substrate located around the touch display area is defined as an edge area, and the touch display panel is further arranged in the edge area: a plurality of first connection lines, used to connect the plurality of data lines to the driving circuit; and A third shielding electrode, the plurality of first connecting lines are arranged between the second substrate and the third shielding electrode, and the third shielding electrode partially or completely covers the plurality of first connecting lines.

23. The touch display device according to claim 22, wherein: The driving circuit is connected to the third shielding electrode. When the first electrode performs touch sensing, a voltage difference between a voltage signal provided by the driving circuit to the third shielding electrode and the touch sensing driving signal remains unchanged.

24. The touch display device according to claim 23, wherein: The plurality of first connection lines are made of the same material as the control electrode, and the third shielding electrode is made of the same material as the first transmission electrode or the first electrode or the second electrode.

25. The touch display device according to claim 9, characterized in that: The common voltage supplied to the second electrode by the driving circuit when driving the first electrode to perform image display refresh is different from the common voltage supplied to the second electrode when driving the first electrode to perform touch sensing.

26. The touch display device according to claim 25, characterized in that: When the driving circuit drives the first electrode to perform touch sensing, the common voltage provided to the second electrode is a changing voltage, and a voltage difference between the common voltage and the touch sensing driving signal remains unchanged.

27. The touch display device according to claim 26, wherein: The common voltage provided by the driving circuit to the second electrode when driving the first electrode to perform image display refresh is a constant voltage.

28. The touch display device according to claim 26, wherein: The driving circuit includes a modulation circuit, which is used to generate a modulation signal. The modulation signal is used to modulate an input signal provided to the touch display panel by the driving circuit when driving the first electrode to perform touch sensing, and the input signal includes the touch sensing driving signal.

29. The touch display device according to claim 28, wherein: The touch sensing driving signal increases as the modulation signal increases, and decreases as the modulation signal decreases.

30. The touch display device according to claim 28, wherein: The modulated signal includes a first reference signal and a second reference signal different from the first reference signal, wherein the voltages of the first reference signal and the second reference signal may be any one of the following five situations: First: the voltage of the first reference signal is a positive voltage, and the voltage of the second reference signal is 0V; Second: the voltage of the first reference signal is 0V, and the voltage of the second reference signal is a negative voltage; Third: the voltage of the first reference signal is a positive voltage, the voltage of the second reference signal is a negative voltage, and the absolute value of the voltage of the first reference signal is equal to or not equal to the absolute value of the voltage of the second reference signal; Fourth: the voltages of the first reference signal and the second reference signal are positive voltages of different magnitudes; Fifth: the voltages of the first reference signal and the second reference signal are negative voltages of different magnitudes.

31. The touch display device according to claim 30, wherein: The modulation circuit is used to be connected between the touch display panel and one end of an electronic device, and the modulation circuit is used to receive a first reference signal from the electronic device. The driving circuit further includes a voltage generating circuit, which is connected to the modulation circuit and is used to provide a second reference signal to the modulation circuit.

32. The touch display device according to claim 31, wherein: One end of the modulation circuit used to connect the electronic device is the device ground, and receives the ground signal output from the device ground, and the first reference signal is the ground signal; or one end of the modulation circuit used to connect the electronic device is the power supply end, and receives the power supply voltage output from the power supply end, and the first reference signal is the power supply voltage; Alternatively, one end of the modulation circuit used to connect the electronic device is a reference power supply end, and receives a reference power supply voltage output from the reference power supply end, and the first reference signal is the reference power supply voltage.

33. The touch display device according to claim 32, wherein: The power supply voltage is higher than the ground signal, and the voltage difference between the two remains unchanged. The reference power supply voltage is between the ground signal and the power supply voltage, and the voltage difference between the reference power supply voltage and the ground signal remains unchanged.

34. The touch display device according to claim 28, wherein: The driving circuit further includes a first ground terminal; the first ground terminal is connected to a device ground of an electronic device through the modulation circuit, and when the first electrode performs touch sensing, the modulation circuit outputs a modulation signal to the first ground terminal; when the first electrode performs image display refresh, the modulation circuit outputs a ground signal from the device ground to the first ground terminal.

35. The touch display device according to claim 34, wherein: The driving circuit further includes a common voltage generating circuit, which includes a first circuit and a second circuit; the ground end of the first circuit is connected between the first ground end and the modulation circuit, and is used to receive the ground signal of the device ground; the ground end of the second circuit is connected between the modulation circuit and the first ground end, and is used to receive the modulation signal; wherein, when the first electrode performs image display refresh, the first circuit is electrically connected to the second electrode, and provides a common voltage to the second electrode; when the first electrode performs touch sensing, the second circuit is electrically connected to the second electrode, and provides another common voltage different from the common voltage provided by the first circuit to the second electrode.

36. The touch display device according to claim 1, wherein: The plurality of first electrodes are pixel electrodes, the second electrode is a common electrode, and the display medium layer is a liquid crystal layer.

37. The touch display device according to claim 3, wherein: A side of the first substrate facing away from the second substrate is used to receive a touch or proximity input from a target object.

38. An electronic device, comprising a main control chip and a touch display device, wherein the main control chip is used to supply power to the touch display device and to communicate data with the touch display device, wherein: The touch display device is the touch display device described in any one of claims 1-37.

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