CN105335009B

CN105335009B - Touch display device and electronic equipment

Info

Publication number: CN105335009B
Application number: CN201510880896.1A
Authority: CN
Inventors: 贾一锋; 夏涛
Original assignee: FocalTech Systems Ltd
Current assignee: FocalTech Systems Ltd
Priority date: 2015-12-03
Filing date: 2015-12-03
Publication date: 2023-08-08
Anticipated expiration: 2035-12-03
Also published as: CN105335009A

Abstract

The invention provides a touch display device and an electronic device. The touch display device includes a touch display panel including a plurality of first electrodes for performing image display and touch sensing; and a driving circuit for driving the touch display panel to perform image display and touch sensing. The driving circuit includes a display driving circuit for driving the plurality of first electrodes to perform image display; a touch driving circuit for driving the plurality of first electrodes to perform self-capacitance touch sensing; a first ground terminal; the second grounding end is used for being connected with equipment ground of the electronic equipment and receiving a grounding signal; the modulating circuit is connected between the first grounding end and the second grounding end and is used for generating a modulating signal when the touch driving circuit drives the touch display panel to execute self-capacitance touch sensing and outputting the modulating signal to the first grounding end, and the modulating signal is used for modulating an input signal of the touch display panel; the modulation circuit outputs a grounding signal to the first grounding end when the display driving circuit drives the touch display panel to execute image display refreshing.

Description

Touch display device and electronic equipment

Technical Field

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

Background

Touch screens are increasingly being used in a variety of electronic products, and are becoming an important intermediate interface device for users to interact with electronic products. However, in the conventional electronic products, a touch screen is additionally disposed, which is not beneficial to the development of the electronic products in the direction of light weight and slim.

Disclosure of Invention

The invention solves the problem of providing a lighter and thinner touch display device and electronic equipment.

Accordingly, the present invention provides a touch display device of an electronic apparatus, including:

a touch display panel including a plurality of first electrodes for performing image display and touch sensing; and

a driving circuit for driving the touch display panel to perform image display and touch sensing, the driving circuit comprising:

a display driving circuit for driving the plurality of first electrodes to perform image display;

a touch driving circuit for driving the plurality of first electrodes to perform self-capacitance touch sensing;

a first ground terminal;

the second grounding end is used for being connected with equipment ground of the electronic equipment and receiving a grounding signal; and

The modulating circuit is connected between the first grounding end and the second grounding end and is used for generating a modulating signal when the touch driving circuit drives the touch display panel to execute self-capacitance touch sensing and outputting the modulating signal to the first grounding end, and the modulating signal is used for modulating an input signal of the touch display panel; the modulation circuit outputs a grounding signal to the first grounding end when the display driving circuit drives the touch display panel to execute image display refreshing.

Optionally, the modulation circuit generates the modulation signal according to the ground signal and a driving signal different from the ground signal.

Optionally, the modulation circuit includes a control unit, a first active switch, and a second active switch, where the first active switch includes a control electrode, a first transmission electrode, and a second transmission electrode, the second active switch includes a control electrode, a first transmission electrode, and a second transmission electrode, the control electrode of the first active switch and the control electrode of the second active switch are respectively connected to the control unit, the first transmission electrode of the first active switch is connected to a second ground terminal, the second transmission electrode of the first active switch is connected to the first transmission electrode of the second active switch, the second transmission electrode of the second active switch is connected to a voltage generating circuit, and a node is defined between the second transmission electrode of the first active switch and the first transmission electrode of the second active switch, where the control unit controls whether the output signal is grounded or driven at the node by controlling the first active switch and the second active switch.

Optionally, the input signal includes a touch sensing driving signal, and the touch driving circuit is configured to output the touch sensing driving signal to the first electrode to perform self-capacitance touch sensing, where the touch sensing driving signal increases with an increase of the modulation signal and decreases with a decrease of the modulation signal.

Optionally, the touch display panel further includes:

a plurality of scan lines;

a plurality of data lines; and

the control switches comprise control electrodes, a first transmission electrode and a second transmission electrode, wherein the control electrodes are used for being connected with scanning lines, the first transmission electrode is used for being connected with data lines, and the second transmission electrode is used for being connected with the first electrode.

The control electrode is used for correspondingly controlling whether the first transmission electrode and the second transmission electrode are conducted or not according to signals transmitted on the scanning line.

Optionally, the touch driving circuit includes:

the touch sensing control circuit comprises a grounding end and a plurality of output ends, wherein the grounding end of the touch sensing control circuit is connected between the modulating circuit and the first grounding end, and the touch sensing control circuit outputs a touch sensing control signal to the scanning line through the output end and activates a control switch connected with the scanning line; and

The touch sensing detection circuit is used for providing a touch sensing driving signal to the first electrode through the data line and the activated control switch and driving the first electrode to execute self-capacitance touch sensing.

Optionally, the display driving circuit includes a ground terminal, the ground terminal of the display driving circuit is connected between the modulating circuit and the first ground terminal, the display driving circuit outputs a scanning signal to the scanning line through the signal transmission terminal, activates a control switch connected with the scanning line, provides a gray scale voltage to the first electrode through the data line and the activated control switch, and drives the first electrode to execute image display refreshing.

Optionally, the driving circuit further includes a control circuit, where the control circuit is configured to control operation timings of the display driving circuit and the touch driving circuit, and the control circuit includes a ground terminal, and the ground terminal of the control circuit is connected between the modulation circuit and the first ground terminal.

Optionally, the touch display panel further includes a second electrode, the driving circuit further includes a common voltage generating circuit, the common voltage generating circuit includes a ground terminal, the ground terminal of the common voltage generating circuit is connected between the modulating circuit and the first ground terminal, and the common voltage generating circuit is used for providing a common voltage to the second electrode, and driving the touch display panel to display an image in cooperation with the first electrode.

Optionally, the driving circuit further includes a display processing circuit and a level conversion unit, and the level conversion unit is connected between the display processing circuit and the control circuit; the display processing circuit comprises a grounding end, and the grounding end of the display processing circuit is connected between the second grounding end and the modulation circuit; the display processing circuit is used for receiving display data from a main control chip of the electronic equipment, correspondingly processing the display data and outputting the processed display data to the level conversion unit; the level conversion unit comprises two grounding ends, wherein one grounding end of the two grounding ends is connected between the second grounding end and the modulation circuit, and the other grounding end of the two grounding ends is connected between the modulation circuit and the first grounding end; the level conversion unit performs level conversion on the display data from the display processing circuit and outputs the level-converted display data to the control circuit.

Optionally, the control circuit outputs corresponding display data and a timing signal to the display driving circuit, and the display driving circuit converts the received display data into a gray scale voltage and outputs the gray scale voltage to the corresponding first electrode according to the timing signal.

Optionally, the touch sensing detection circuit includes:

the second signal processing circuit comprises a grounding end, the grounding end of the second signal processing circuit is connected between the modulating circuit and the first grounding end, and the second signal processing circuit is used for providing a touch sensing driving signal; and

the touch sensing detection unit comprises a first operational amplifier, a feedback capacitor and a fourth switch; the first operational amplifier comprises an inverting terminal, an in-phase terminal, an output terminal and a grounding terminal, wherein the grounding terminal of the first operational amplifier is connected between the modulating circuit and the first grounding terminal, the feedback capacitor and the fourth switch are connected between the inverting terminal and the output terminal, the inverting terminal is further used for being connected with the data line, and the in-phase terminal is connected with the second signal processing circuit.

Optionally, the driving circuit further includes a level shift unit, where the level shift unit includes two ground terminals, one of the two ground terminals is connected between the second ground terminal and the modulation circuit, and the other ground terminal is connected between the modulation circuit and the first ground terminal;

the touch sensing detection circuit further includes:

The analog-digital signal processing unit comprises a grounding end, wherein the grounding end of the analog-digital signal processing unit is connected between the modulation circuit and the first grounding end, and the analog-digital signal processing unit is connected with the output end of the first operational amplifier; and

a calculation unit;

the touch sensing detection unit outputs a touch driving signal to the first electrode, receives the touch sensing detection signal output by the first electrode, correspondingly processes the received touch sensing detection signal, and outputs the processed touch sensing detection signal to the analog-digital signal processing unit, and the analog-digital signal processing unit converts the received touch sensing detection signal from the touch sensing detection unit into an analog-digital signal and outputs the corresponding digital signal to the level conversion unit; the level conversion unit performs level conversion on the digital signal and outputs the digital signal after the level conversion to the calculation unit; the calculating unit calculates the touched position of the touch display panel according to the received digital signal.

Optionally, the computing unit includes a ground, and the ground of the computing unit is connected between the modulation circuit and the first ground or between the modulation circuit and the second ground.

Optionally, the display driving circuit includes a scan driving circuit for providing a scan signal and a data driving circuit for providing a gray scale voltage; the touch sensing detection circuit comprises a plurality of transmission ends, wherein the transmission ends are used for outputting touch sensing driving signals to the data lines.

Optionally, the driving circuit further includes:

the first switch unit is arranged between the data driving circuit and the data lines and comprises a plurality of first switches, each data line is connected with the data driving circuit through a first switch, each first switch comprises a grounding end, and the grounding end of the first switch is connected between the modulation circuit and the first grounding end;

the plurality of third switches comprise grounding ends, the grounding ends of the third switches are connected between the modulation circuit and the first grounding ends, and the plurality of third switches are connected with the plurality of transmission ends in a one-to-one correspondence manner;

the second switch unit is arranged between the touch sensing detection circuit and the data lines and comprises a plurality of second switches, each data line is connected with a transmission end sequentially through a second switch and a third switch, each second switch comprises a grounding end, and the grounding end of each second switch is connected between the modulation circuit and the first grounding end.

Optionally, a third switch is connected to at least two second switches.

Optionally, the driving circuit further includes a selection circuit, disposed between the touch sensing control circuit and the scan driving circuit, for selecting whether to output a scan signal or a touch sensing control signal to the scan line, where the selection circuit includes a ground terminal, and the ground terminal of the selection circuit is connected between the modulation circuit and the first ground terminal.

Optionally, the touch display panel further includes a ground line, and the ground line is connected to the first ground terminal.

The invention also provides electronic equipment, which comprises the touch display device.

Since the first electrode of the touch display device is used to perform image display refresh and touch sensing, the touch display device becomes slim and slim. Accordingly, the electronic device with the touch display device is lighter and thinner. In addition, when the touch display device performs touch sensing, the modulation circuit outputs a modulation signal to the first grounding terminal, and the modulation signal is used for modulating an input signal of the touch display panel, so that the signal-to-noise ratio can be improved, and further the touch sensing precision is improved.

Drawings

Fig. 1 is a schematic diagram of an embodiment of an electronic device according to the present invention.

Fig. 2 is a schematic diagram of an embodiment of the touch display device shown in fig. 1.

Fig. 3 is a schematic circuit diagram of a touch display device according to another embodiment of the invention.

Fig. 4 is a schematic structural view of another embodiment of a touch display panel.

Fig. 5 is an enlarged plan view of a portion of the second electrode and the first electrode shown in fig. 4.

Fig. 6 is a schematic view illustrating a partial cross-sectional structure of another embodiment of the touch display panel shown in fig. 4.

Fig. 7 is an enlarged plan view of a portion of the second electrode and the first electrode shown in fig. 6.

Fig. 8 is a schematic diagram of an assembled structure of the touch display panel shown in fig. 4.

Fig. 9 is a schematic diagram of a structure of the touch sensing circuit shown in fig. 3.

FIG. 10 is a schematic diagram of an embodiment of the touch sensing unit and the processing unit shown in FIG. 9.

Fig. 11 is a schematic diagram of a partial circuit structure of an embodiment of a touch display device.

Fig. 12 is a schematic diagram of a partial circuit structure of another embodiment of a touch display device.

Fig. 13 is a schematic structural view of another embodiment of the electronic device of the present invention.

Fig. 14 is a schematic diagram of an embodiment of the modulation circuit shown in fig. 13.

Fig. 15 is a schematic circuit diagram of an embodiment of the second signal processing circuit when the electronic device uses only one GND-referenced domain.

Fig. 16 is a schematic circuit diagram of an embodiment of the second signal processing circuit when the electronic device adopts two domains with GND and MGND as references.

Fig. 17 is a circuit schematic diagram of the protection circuit.

Fig. 18 is a schematic diagram of another embodiment of a protection circuit.

Fig. 19 is a schematic structural view of another embodiment of a self-capacitive touch screen.

Fig. 20 is a schematic diagram of the structure of the common voltage generating circuit.

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

Fig. 22 is a schematic diagram of the display driving circuit shown in fig. 13.

Fig. 23 is a schematic partial structure of another embodiment of the electronic device of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The thickness and size of each layer shown in the drawings, and the number of related elements may be exaggerated, omitted, or schematically shown for convenience or clarity. In addition, the size of the elements does not fully reflect the actual size, and the number of related elements does not fully reflect the actual number. There may be instances where the number of identical or similar or related elements shown in different figures is not consistent, for reasons of differing figure sizes, etc. In the drawings, the same reference numerals have been used to designate the same or similar structures. However, it should be noted that, in order to make the labels regular, logical, etc., in some different embodiments, the same or similar elements or structures are denoted by different reference numerals, and those skilled in the art may directly or indirectly determine that they are related to each other according to the technical relevance and the related text.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. It will be appreciated, however, by one skilled in the art that the inventive aspects may be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.

Further, the following terms are exemplary and are not intended to be limiting in any way. Those skilled in the art will recognize, after reading this application, that the term is useful in the art, methods, physical elements, and systems (whether presently known or not), including extensions thereof which may be inferred or inferred by those skilled in the art after reading this application.

In the description of the present invention, it is to be understood that: the term "plurality" includes two and more than two and the term "plurality" includes two and more than two unless the invention is specifically defined otherwise. The term "at least two" includes a plurality of cases of two, three, four, five, etc., and the term "at least two" includes a plurality of cases of two, three, four, five, etc. In addition, the words such as "first", "second", etc. appearing in each element name and signal name do not limit the order of appearance of the elements or signals, but are used for convenience in naming the elements, and clearly distinguishing the elements, so that the description is more concise.

Touch screens generally include resistive, capacitive, infrared, and the like types of touch screens, with capacitive touch screens being more widely used. Capacitive touch screens in turn include mutual capacitive touch screens and self-capacitive touch screens.

In mutual capacitance based touch systems, a touch screen can include, for example, drive and sense regions, such as drive and sense lines. In an example case, the drive lines may form multiple rows, while the sense lines may form multiple columns (e.g., orthogonal). Touch pixels may be disposed at intersections of rows and columns. During operation, the rows may be stimulated with alternating current signal (AC) waveforms, and a mutual capacitance may be formed between the rows and columns of the touch pixels. As an object approaches the touch pixel, some of the charge coupled between the rows and columns of the touch pixel may instead be coupled to the object. This reduction in charge coupled to the touch pixel can result in a net reduction in the 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 location of the object when touching the touch screen.

In contrast, in self-capacitance based touch systems, each touch pixel may be formed from individual electrodes that form a self-capacitance to ground. As an object approaches the touch pixel, another capacitance to ground (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 can be detected and measured by the touch system to determine the position of the object when touching the touch screen.

To avoid confusion, further pre-explanation is needed:

first, with respect to the first electrode in the touch display panel of the present invention, the first electrode can be functionally used as both a pixel electrode for image display and a sensing electrode for touch sensing. The first electrode may be a common electrode in the modulation field, and the following description will be given of the modulation field related embodiments. The first electrode is not limited to the pixel electrode or the common electrode, but may be an electrode having another name but the same or similar function.

Second, taking the first electrode as a pixel electrode as an example, for a single pixel electrode, two main operation states are respectively a touch sensing state and an image display state. The image display state is subdivided into two main display states, namely an image display refresh state and an image display hold state. The image display state starts from an image display refreshing state, and enters an image display maintaining state after the image display refreshing is finished until entering a touch sensing state.

For example, after a first electrode performs touch sensing, providing a gray-scale voltage to the first electrode to perform image display refresh, and after the gray-scale voltage is written to the first electrode, the image display refresh is completed, and accordingly, the providing of the gray-scale voltage to the first electrode is stopped. After that, the first electrode enters an image display holding state until the first electrode performs touch sensing next time. In addition, the image display refreshing may further include pre-charging or pre-discharging the first electrodes, and providing a gray scale voltage for realizing a predetermined gray scale picture to the first electrodes after the first electrodes of the same row reach the same voltage.

It is noted herein that the two different display states of image display refresh and image display hold are provided for a better understanding of the embodiments of the invention described below. In addition, more definitely, "image display refresh" and "image display hold" are two different technical concepts.

Accordingly, in some embodiments, when it is required that any two first electrodes in the touch display panel do not perform image display refresh and touch sensing simultaneously, there is a case where two first electrodes perform image display retention and touch sensing simultaneously.

Third, for the entire touch display device, three main operation states are a touch sensing state, an image display refresh state, and a vertical blanking period, respectively.

Next, embodiments of the present invention will be described.

Referring to fig. 1, fig. 1 is a schematic diagram of an embodiment of an electronic device according to the present invention. The electronic device 100 is a mobile phone, a tablet computer, a notebook computer, a desktop computer, a wearable device, a smart home, or other suitable products. The invention is not limited in this regard. The electronic device 100 comprises a touch display device 1. The touch display device 1 is used for realizing 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 description will mainly take touch liquid crystal display devices as examples. However, alternatively, the display device in the touch display device 1 may be other suitable type of display device, such as an electronic paper display device (EPD), and so on.

Referring to fig. 2 together, fig. 2 is a schematic diagram of an embodiment of the touch display device 1 shown in fig. 1. The touch display device 1 includes 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 for driving the touch display panel 10 to perform image display and self-capacitance touch sensing.

The touch display panel 10 includes a plurality of display electrodes 11, the plurality of display electrodes 11 being for performing image display, at least some of the plurality of display electrodes 11 being further for performing self-capacitance touch sensing. The display electrode 11 for performing both image display and self-capacitance touch sensing is defined as the first electrode 101. The driving circuit 20 is configured to provide a touch sensing driving signal to the first electrode 101 to perform self-capacitive touch sensing, and also configured to provide a gray scale voltage to the display electrode 11 to perform image display.

Since the first electrode 101 of the touch display panel 10 is used for performing both image display and self-capacitance touch sensing, the touch display device 1 is more slim and lightweight.

In this embodiment, the plurality of display electrodes 11 are arranged in a two-dimensional array. The plurality of display electrodes 11 are coplanar with the layers. However, alternatively, 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 co-layered or coplanar.

One way of operation is: all display electrodes 11 are used for performing both image display and self-capacitive touch sensing. However, alternatively, it is also possible that some of the display electrodes 11, for example, the display electrodes 11 of the first and second rows or one of the rows, are used only for performing image display or touch sensing, and for clarity, the display electrode 11 located outside the dashed frame area is the first electrode 101, and the display electrode 11 located inside the dashed frame area (the display electrode 11 of 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 performing touch sensing, for example, the display electrode 11 shown in fig. 2.

It should be understood that, while a portion of the display electrode 11 is shown as the first electrode 101 in fig. 2 for clarity of illustration, all of the display electrodes 11 in the touch display device 1 described below are used for performing both image display and self-capacitance touch sensing, and accordingly, in the following description of the embodiments, all of the display electrodes 11 are described and illustrated as being used as the first electrode 101, however, it is easy for those skilled in the art to think of other embodiments in which not all of the display electrodes 11 are used as the first electrode 101 according to the following various embodiments of the present application, and for clarity of brevity, other related embodiments are not repeated, but all fall within the scope of protection of the present application. The same applies to the touch display device 4 of the electronic device 400, the touch display device of the electronic device 900, and the like described below.

In the present embodiment, the touch display device 1 is described by taking a touch liquid crystal display device as an example, and the display electrode 11 is a pixel electrode accordingly. The shape of the first electrode 101 is approximately rectangular (as shown in fig. 2), but is not limited to rectangular. The length L of each first electrode 101 typically ranges from 20 microns to 300 microns, and the width W typically ranges from 10 microns to 150 microns. The shape of the first electrode 101 is generally not a regular rectangle. The length L and the width W of the first electrode 101 are not limited to the above-described normal range.

The driving circuit 20 does not drive one first electrode 101 of the two first electrodes 101 to perform self-capacitance touch sensing and the other first electrode 101 to perform image display refresh. Accordingly, to implement the driving method, in one embodiment, the driving circuit 20 does not simultaneously provide the touch sensing driving signal and the gray scale voltage to the touch display panel 10. However, in other embodiments, the driving circuit 20 may also provide the touch sensing driving signal and the gray scale voltage to the touch display panel 10 at the same time, but the purpose of controlling the self-capacitive touch sensing performed by driving one of the two first electrodes 101 and the image display refreshing performed by the other first electrode 101 is achieved by controlling the output of the driving circuit 20 itself. Since more and more circuits can be formed in the touch display panel 10 with the development of the circuit technology and the technology of the touch display panel 10, it is possible for the driving circuit 20 to output the touch sensing driving signal and the gray scale voltage to the touch display panel 10 at the same time, but it is also possible for it not to output the touch sensing driving signal and the gray scale voltage to the first electrode 101 at the same time.

Referring to fig. 3, fig. 3 is a schematic circuit diagram of a touch display device 1 according to another embodiment of the 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 are arranged to intersect the plurality of data lines 103 in an insulating manner. The plurality of control switches 104 are respectively disposed at 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 transfer electrode S, and a second transfer electrode D. 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 and the first electrode 101 are used to form an electric field therebetween to control the light transmittance of the touch display panel 10. In this embodiment, the touch liquid crystal display device is taken as an example, and therefore, the second electrode 105 is a common electrode accordingly.

In this embodiment, the plurality of scan lines 102 are disposed to perpendicularly intersect the plurality of data lines 103. 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 a row direction, and the second direction Y is a column direction. Alternatively, in other embodiments, the first direction X may be a column direction and the second direction Y may be a row direction. In addition, the first direction X and the second direction Y may be non-perpendicular.

In this embodiment, the control switch 104 is a thin film transistor switch. The thin film transistor switch comprises an amorphous silicon thin film transistor switch, a low-temperature polycrystalline silicon thin film transistor switch, a high-temperature polycrystalline silicon thin film transistor switch, a metal oxide thin film transistor switch and the like. Wherein the metal oxide thin film transistor switch is an Indium Gallium Zinc Oxide (IGZO) thin film transistor switch. Correspondingly, 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 be any other suitable type of switch, such as a bipolar transistor switch.

The driving circuit 20 is configured to provide a touch sensing control signal to the plurality of scan lines 102, and activate a control switch 104 connected to the plurality of scan lines 102. In addition, the driving circuit 20 is further configured to provide the touch sensing driving signal to the plurality of data lines 103, and the touch sensing driving 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.

The touch sensing driving signal is a varying voltage signal, for example, a periodically varying square wave pulse signal. However, the touch sensing driving signal may be other suitable driving signals such as a current signal, not limited to a voltage signal, and may be an aperiodic signal, a sine wave, a trapezoidal wave, or other suitable waveform signals.

In this embodiment, at the time of touch sensing, a pressure difference between the touch sensing control signal and the touch sensing driving signal is maintained. Accordingly, the touch sensing control signal is also a varying signal, and the control switch 104 is made conductive.

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

Further, when the first electrode 101 performs touch sensing, the driving circuit 20 may further provide a second signal to the scan line 102 connected to the first electrode 101 that does not perform touch sensing, where the second signal may enable the control switch 104 to be in an off state, while maintaining a voltage difference with the touch sensing driving signal.

For example, the second signal may be supplied to the scan lines 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. For the concept of "proximity", for example, the first electrode 101 of the 41 st to 80 th rows is simultaneously driven by the driving circuit 20 to perform self-capacitive touch sensing, that is, the 1 st to 40 th scan lines 102 are scan lines adjacent to the first electrode 101 of the 41 st row, and the 81 st to 120 th scan lines 102 are scan lines adjacent to the first electrode 101 of the 80 th row. The scanning lines 102 "adjacent" are, for example, within 40 scanning lines 102 (in terms of a single side) adjacent to the first electrode 101 that performs touch sensing. However, the number of "adjacent" scan lines 102 may also be extended to scan lines 102 (on a single side) within 200.

In addition to the above-described varying voltage signal, the touch sensing control signal may be a constant signal, in other embodiments, for activating the control switch 104. In addition, the touch sensing control signal is not limited to be constant in pressure difference with the touch sensing driving signal.

The driving circuit 20 is further configured 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 learn, according to the touch sensing detection signal, a position where the touch display panel 10 is touched or approached by a target object (i.e., the above-mentioned touch object). The target object may be a finger, a toe, or other suitable type of object, such as a touch pen, for example, and the following description will mainly take the target object as a finger for example. The capacitance between the target object and the first electrode 101 is defined as a contact capacitance (not shown).

In 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 at a time. In one embodiment, for example, at least two scan lines 102 are driven simultaneously at a time. The at least two scan lines 102 are adjacent scan lines. Alternatively, however, the at least two scan lines 102 may not be adjacent scan lines, such as an interlaced scan line, or the like. Further, when the scan line 102 is scanned or the control switch 104 is activated, the driving circuit 20 performs self-capacitive touch sensing on part or all of the first electrodes 101 connected to the activation control switch 104. In other words, the driving circuit 20 supplies the touch sensing driving signal to some or all of the data lines 103.

When the driving circuit 20 is configured to perform self-capacitive touch sensing on the first electrode 101 connected to a portion of the data lines 103, the driving circuit 20 further provides a third signal to the data lines 103 connected to the first electrode 101 that does not perform touch sensing, and a voltage difference between the third signal and the touch sensing driving signal remains unchanged.

For example, the third signal may be supplied to the data lines 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. For the concept of "proximity", for example, the first electrode 101 of the 51 st column to the 100 th column is simultaneously driven by the driving circuit 20 to perform self-capacitive touch sensing, that is, the 1 st to 50 th data lines 103 are data lines adjacent to the first electrode 101 of the 51 st column, and the 101 st to 150 th data lines 103 are data lines adjacent to the first electrode 101 of the 100 th column. The "adjacent" data lines 103 are, for example, data lines 103 (in terms of a single side) within 50 adjacent to the first electrode 101 performing touch sensing. However, the number of "adjacent" data lines 103 may also be extended to less than 250 data lines 103 (for a single side).

Further, the driving circuit 20 is further configured to provide a scan signal to the plurality of scan lines 102, activate the control switch 104 connected to the plurality of scan lines 102, and the gray scale 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, and in addition, the driving circuit 20 provides a common voltage to the second electrode 105, so as to drive the touch display panel 10 to perform image display refresh. Wherein the scan signal for activating the control switch 104 is preferably a constant voltage. The pressure difference between the first electrode 101 and the second electrode 105 is used to determine the display gray scale of the touch display device 1.

As can be seen from the above description, since the touch display device 1 of the present invention performs a touch sensing function by multiplexing 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 of the display panel, the touch display device 1 of the present invention and the electronic apparatus 100 having the touch display device 1 are lighter and thinner.

The driving circuit 20 is different from the common voltage (or referred to as "first signal") supplied to the second electrode 105 when the first electrode 101 is driven to perform touch sensing and the common voltage supplied to the second electrode 105 when the first electrode 101 is driven to perform image display refresh, wherein a voltage difference between the common voltage supplied to the second electrode 105 when the first electrode 101 is driven to perform touch sensing and the touch sensing driving signal supplied to the first electrode 101 is kept constant; the common voltage provided to the second electrode 105 by the driving circuit 20 when driving the first electrode 101 to perform the image display refresh may be a constant voltage, but may also be a square wave signal.

Since the voltage difference between the common voltage supplied to the second electrode 105 and the touch sensing driving signal supplied to the first electrode 101 when the driving circuit 20 drives the first electrode 101 to perform touch sensing is maintained, capacitive coupling interference of the second electrode 105 when the first electrode 101 performs touch sensing can be reduced or avoided, thereby improving touch sensing accuracy.

However, alternatively, the common voltage (or referred to as "first signal") provided to the second electrode 105 when the driving circuit 20 drives the first electrode 101 to perform touch sensing may be the same as the common voltage provided to the second electrode 105 when the driving circuit 101 drives the first electrode 101 to perform image display refresh, but the sensing effect is relatively less good.

Generally, an electronic device generally includes a bright screen operating state and a black screen standby state. In the idle state of the black screen, the electronic device does not normally perform substantial work, the touch display panel is black, and no light passes through. In contrast, in the bright screen working state, the electronic device has light rays penetrating out of the touch display panel and can execute corresponding functions. Specifically, the working states of the bright screen can further include a bright screen locking state and a bright screen unlocking state. When the electronic equipment is in a black screen standby state, a user needs to press a power key or a Home key of the electronic equipment first, wake up the touch display device to a bright screen locking state, then input a password, and when the password is correct, the touch display device enters an unlocking state, so that the user can start to control the electronic equipment to execute corresponding functions.

However, after a large number of presses of either the power key or the Home key, the power key may fail, resulting in the need to replace a new part. In addition, the procedure for controlling the electronic equipment to switch from the black screen standby state to the unlocking state is slightly complicated, and accordingly, the inventor of the invention correspondingly proposes a new awakening mode of the electronic equipment through a great deal of research.

In the idle state of the black screen, the touch display device 1 of the present invention performs a touch sensing function, and when a target object touches the touch display panel 10 in a predetermined manner, the touch display device 1 wakes up to enter a lock state or directly enters a unlock state. The predetermined manner is, for example, a specific touch path, so that the use quality and the use efficiency of the product can be improved, and the electronic device 100 is more humanized.

For clarity of distinction, the common voltage that the driving circuit 20 supplies to the second electrode 105 when driving the first electrode 101 to perform image display refresh is defined as the first common voltage; defining the common voltage provided to the second electrode 105 by the driving circuit 20 when the electronic device 100 is in the bright screen operation state and the first electrode 101 is driven to perform touch sensing as the second common voltage; the driving circuit 20 is defined as a third common voltage which is supplied to the second electrode 105 when the electronic device 100 is in the black screen standby state and the first electrode 101 is driven to perform touch sensing.

Specifically, in the idle state of the black screen, the driving circuit 20 supplies the touch sensing driving signal to the first electrode 101 and supplies the third common voltage to the second electrode 105. Wherein the touch sensing driving signal is the same as the third common voltage, thereby causing not only the touch display panel 10 to display a black picture but also the touch display panel 10 to perform a touch sensing function.

Further, in the black standby state, the driving circuit 20 stops supplying the gray scale voltage to the first electrode 101 and stops supplying the first common voltage to the second electrode 105. That is, in the black screen standby state, the touch display device 1 preferably continuously performs touch sensing. However, alternatively, in the idle state of the black screen, the driving circuit 20 may also drive the first electrode 101 to perform the image display refresh and the self-capacitance touch sensing in a time-sharing manner. Wherein, when the image display refresh is performed, the gray-scale voltage supplied to the first electrode 101 by the driving circuit 20 is the same as the common voltage supplied to the second electrode 105, thereby realizing the black screen display.

In the bright screen operation state, when the driving circuit 20 drives the touch display panel 10 to perform touch sensing, the second common voltage is supplied to the second electrode 105. The second common voltage is preferably different from the third common voltage.

In general, a liquid crystal display panel includes a plurality of pixel units, each including sub-pixels of R, G, B colors, and color image display of different gray scales is realized by controlling the light-emitting brightness of the sub-pixels of the three colors. Each sub-pixel comprises a control switch, a pixel electrode connected with the control switch and a common electrode. The voltage loaded on the pixel electrode and the public electrode determines the deflection angle of the liquid crystal molecules, so that the light transmittance of the sub-pixels is determined, and the color of the color filter is combined to realize color image display.

Referring to fig. 4, fig. 4 is a schematic 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 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 thin 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.

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 order to realize color image display, a Color Filter (CF) substrate is preferably formed by providing a color filter, a black matrix, or other elements (not shown) on the side of the first substrate 106 facing the second substrate 107. Wherein a side of the first substrate 106 facing away from the second substrate 107 is used for image display and receiving touch or proximity input of a user. The side of the first substrate 106 that is defined for image display and receives a touch or proximity input of a user is a touch display side a.

An fringe electric field is formed between the first electrode 101 and the second electrode 105 to control a deflection angle of the liquid crystal molecules, thereby controlling light transmittance of the touch display panel 10. In this embodiment, the second electrode 105 is located at a different layer from the plurality of first electrodes 101 and is 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 a 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.

Referring to fig. 5, fig. 5 is a partially enlarged plan view of the second electrode 105 and the first electrode 101 shown in fig. 4. The plurality of hollow structures 115 corresponding to the same first electrode 101 are arranged along the third direction and extend along the 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 be the same as the second direction Y, the fourth direction may be the same as the first direction X, or the third direction and 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, bar-shaped, however, the plurality of hollow structures 115 may be other suitable shapes, which is not limited in the present invention. For another example, the size and shape of the plurality of hollow structures 115 are the same, but the size and shape of the plurality of hollow structures 115 may be different.

In the direction along the arrangement of the plurality of hollow structures 115 (opposite to the same first electrode 105), the width L1 of the hollow structures 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 oblique lines) between adjacent hollow structures 115 opposite to the same first electrode 101 to distinguish the hollow structures 115 is preferably less than or equal to the area A1 of one 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 has a large strain, so that the touch sensing accuracy can be improved.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a partial cross-sectional structure of another embodiment of the touch display panel 10 shown in fig. 4. To distinguish the touch display panel 10 described in fig. 4, the touch display panel shown in fig. 6 is denoted by 10a, and the same or similar elements in the touch display panel 10a as those in the touch display panel 10 are denoted by the same reference numerals. The touch display panel 10a is substantially the same as the touch display panel 10, and the main difference between them 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.

Since the first electrode 101 is disposed on the second electrode 105, the first electrode 101 can be correspondingly made large, so that the capacitive area coupled with the target object or the touch object can be increased, and further, the touch sensing accuracy can be improved.

When the second electrode 105 is disposed between the first electrode 101 and the second substrate 107, the hollow structure 115 may not be disposed on the second electrode 105. However, in order to increase the fringe electric field strength, the hollow structure 115 may be disposed on the first electrode 101 correspondingly. 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 have any hollow structure.

Referring to fig. 7, fig. 7 is a partially enlarged plan view of the second electrode 105 and the first electrode 101 shown in fig. 6. There is also a region 113 between adjacent hollowed-out structures 115 on the same first electrode 101. Correspondingly, for a plurality of hollow structures 115 on the same first electrode 101: along the arrangement direction of the plurality of hollow structures 115, the width L1 of the hollow structures 115 is smaller than or equal to the width L2 of the area between the adjacent hollow structures 115, or/and the area A2 of the area 113 between the adjacent hollow structures 115 is preferably larger than or equal to the area A1 of one 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 has a large strain, so that the touch sensing accuracy can be improved.

Note that, regardless of 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.

In addition, the present invention is not limited to forming a fringe electric field between the first electrode 101 and the second electrode 105, and alternatively, a vertical electric field may be formed between the second electrode 105 and the first electrode 101. Accordingly, it is also possible that the second electrode 105 is arranged between the first substrate 106 and the display medium layer 108, and that a side of the second substrate 107 facing away from the first substrate 106 is used as the touch display side a described above. The plurality of first electrodes 101 and the plurality of second electrodes 105 may be disposed on the same layer, and a fringe electric field may be formed.

Since the data line 103 and the control switch 104 are used for transmitting the touch sensing driving signal to the first electrode 101, when the target object touches the touch display panel 10 at the position corresponding to the data line 103 and/or the control switch 104, false sensing is caused or the accuracy of real sensing is affected.

Accordingly, in order to overcome the foregoing problems, a shielding layer may be further disposed in the touch display panel 10, and the shielding layer is disposed between the first substrate 106 and the data line 103 and the control switch 104, so as 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 is kept unchanged, so that the influence of the data line 103 and the control switch 104 on the sensing accuracy of the first electrode 101 is avoided. Of course, the shielding layer may cover only one of the two types of elements, namely, the data line 103 and the control switch 104, and the above problem can be solved to some extent, and the shielding layer is not limited to cover the two types of elements, and preferably covers at least the data line 103.

It should be noted that the shielding layer may be an integral structure or a split structure. When the shielding layer is in a split structure, the shielding layer includes a first shielding electrode and a second shielding electrode, where 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.

Further, since parasitic capacitance exists between the scan line 102 and the first electrode 101, when a target object touches a position on the touch display panel 10 corresponding to the scan line 102, touch sensing accuracy of the first electrode 101 is also affected. Accordingly, the shielding layer correspondingly 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 plurality of scan lines 102, the plurality of data lines 103, and the plurality of control switches 104.

When a shielding layer is additionally provided, although the technical problem of the reduced sensing accuracy is solved, the thickness of the touch display panel 10 is increased by phase inversion, and thus the present invention proposes to select the multiplexing second electrode 105 as the shielding layer.

Referring to fig. 8 and fig. 4 together, fig. 8 is a schematic structural diagram of the assembled touch display panel 10 shown in fig. 4. Adjacent two sides of the second substrate 107 protrude from the first substrate 106 for edge routing. Depending on 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 overlaps the second substrate 107 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 completely covers, for example, the data line 103, the scan line 102, and the control switch 104 located in the touch display area T.

The first connection line 109, the second connection line 110, and the third shielding electrode 111 are further provided at the edge region H. The first connection line 109 is for connecting the data line 103 to the driving circuit 20 (see fig. 3). The first connection line 109, the second connection line 110, and the third shielding electrode 111 are omitted in fig. 3. The second connection line 110 is used for connecting the scan line 102 to the driving circuit 20 (see fig. 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 configured 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 region H of the electronic device 100 is avoided. Preferably, a voltage difference between the shielding signal and the touch sensing driving signal is maintained.

An insulating layer is also provided between the third shielding electrode 111 and the first and second connection lines 109 and 110.

Referring to fig. 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, and is configured to provide a touch sensing control signal to the scan line 102, and further configured to provide a touch sensing driving signal to the first electrode 101 through the data line 103 and the control switch 104, so as to 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, for supplying a scan signal to the scan line 102, for supplying a gray scale voltage to the first electrode 101 through the data line 103 and the control switch 104, and the common voltage generating circuit 207 is further configured to supply a first common voltage to the second electrode 105, so as to perform an image display refresh.

The drive circuit 20 further comprises 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 for controlling 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 scanning signal and a gray scale voltage to the touch display panel 10. In addition, the control circuit 205 is further configured to control the driving circuit 20 to respectively provide different common voltages to the second electrode 105 when the first electrode 101 performs image display refresh and touch sensing. The driving circuit 20 may also have the same common voltage supplied to the second electrode 105 when the first electrode 101 performs the image display refresh and the touch sensing.

Preferably, the touch driving 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 configured to provide a touch sensing control signal to the plurality of scan lines 102, and activate the control switch 104 connected to the scan lines 102. The touch sensing detection circuit 2013 is connected to the plurality of data lines 103, and is configured to provide a touch sensing driving signal to the first electrode 101 through the data lines 103 and the activated control switch 104, so as to drive the first electrode 101 to perform self-capacitive touch sensing. The touch sensing detection circuit 2013 further receives the touch sensing detection signal output from the first electrode 101 through the activated control switch 104 and the data line 103, and learns the position of the touch display panel 10 touched or approached by the target object according to the touch sensing detection signal. The touch sensing control circuit 2011 is formed in a chip or on the touch display panel 10. When formed on the touch display panel 10, the touch sensing control circuit 2011 is formed on the second substrate 107 of the touch display panel 10 (the second substrate 107 is shown in fig. 4), for example, together with the control switch 104.

The display driving circuit 203 includes a scan driving circuit 2031 and a data driving circuit 2033. The scan driving circuit 2031 is connected to the plurality of scan lines 102, and is configured to supply scan signals to the plurality of scan lines 102, and activate the control switch 104 connected to the scan lines 102. The data driving circuit 2033 is connected to the plurality of data lines 103, and is configured to supply gray scale 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. Among them, the scan driving circuit 2031 is formed either in a chip or on the touch display panel 10. When formed on the touch display panel 10, the scan driving circuit 2031 is preferably formed on the second substrate 107 of the touch display panel 10 together with the control switch 104 (the second substrate 107 is shown in fig. 4).

It should be noted that, in fig. 3, the touch sensing detection circuit 2013 and the data driving circuit 2033 are shown on opposite sides of the touch display panel 10 and are respectively connected to opposite ends of the data line 103, however, preferably, the touch sensing detection circuit 2013 and the data driving circuit 2033 are both connected to terminals on the same side of the data line 103 (see fig. 11 and 12 below), and fig. 3 is limited to the size and the element connection relationship of the drawings, and the touch sensing detection circuit 2013 and the data driving circuit 2033 are correspondingly connected to opposite ends of the data line 103.

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 configured to generate the first common voltage, the second common voltage, and the third common voltage, and correspondingly output the corresponding common voltages to the second electrode 105 under the control of the control circuit 205.

Specifically, when the touch display device 1 performs an image, the control circuit 205 controls the common voltage generating circuit 207 to supply the first common voltage to the second electrode 105; when the touch display device 1 is in the bright screen operation state and the self-capacitance touch sensing is performed, the control circuit 205 controls the common voltage generating circuit 207 to supply the second common voltage to the second electrode 105; when the touch display device 1 is in the black screen standby state and the self-capacitance touch sensing is performed, the control circuit 205 controls the common voltage generating circuit 207 to supply the third common voltage to the second electrode 105.

In the present 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 outputs touch sensing control signals to at least two scan lines 102 through the output ends a at the same time, and activates a control switch 104 connected with the at least two scan lines 102. Alternatively, the output terminal a of the touch sensing control circuit 2011 may 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 output a touch sensing control signal to a plurality of scan lines 102 through a plurality of output terminals a at a time at the same time.

The touch sensing detection circuit 2013 includes a plurality of transmission terminals b. Preferably, the transmission terminal b is 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 terminal b, and receives a touch sensing detection signal from the at least two data lines 103 through the transmission terminal b. Alternatively, the transmission terminal b of the touch sensing detection circuit 2013 may 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 be non-adjacent data lines, such as spaced data lines, as appropriate.

It can be seen that the plurality of first electrodes 101 are divided into a plurality of groups, and the plurality of first electrodes 101 connected to the same output terminal a and the same transmission terminal b form a group, and are connected in parallel to form one touch sensing electrode when performing touch sensing. Preferably, the first electrodes 101 connected in parallel are arranged in a matrix. One touch sensing electrode formed by connecting a plurality of first electrodes 101 in parallel in the same group corresponds to and defines a touch point on the touch display panel 10, where the touch point is, for example, a square area with a length and a width of 1mm, but the application is not limited thereto, and the touch point may also be a rectangular area with a length and a width of other sizes, respectively, and accordingly, the number of the first electrodes 101 is increased or decreased, or the size of the first electrodes 101 is changed correspondingly. In the case of a group having only one first electrode 101, this group likewise corresponds to defining a touch point on the touch display panel 10. As described above, since the first electrode 101 is approximately rectangular, the square region and the rectangular region also correspond to an approximately square region and an approximately rectangular region.

In this embodiment, each output terminal a is connected to at least two scan lines 102, a part of the transmission terminals b is connected to at least two data lines 103, and a part of the transmission terminals b is connected to one data line 103. Alternatively, in other embodiments, a part of the transmission ends b may be respectively connected to at least two data lines 103, and a part of the transmission ends b may be respectively connected to one data line 103; the partial output ends a are respectively connected with at least two scanning lines 102, and the partial output ends a are respectively connected with one scanning line 102. Accordingly, the plurality of first electrodes 101 are divided into a plurality of groups, at least one group including at least two first electrodes 101 connected in parallel, at least one group including a first electrode 101.

Alternatively, the number of scan lines 102 at the edge of the touch display panel 10 connected to one output terminal a is smaller than the number of scan lines 102 at the middle of the touch display panel 10 connected to the other output terminal a; and/or the number of the data lines 103 positioned at the edge of the touch display panel 10 connected with one transmission terminal b is smaller than the number of the data lines 103 positioned at the middle of the touch display panel 10 connected with the other transmission terminal b. Accordingly, the edge touch sensing accuracy of the touch display panel 10 is improved.

The touch points located in the middle area of the touch display panel 10 are square areas with a length and a width of 1mm, and the touch points located in the edge area of the touch display panel 10 are square areas with a length and a width of 0.5mm, but the invention is not limited thereto, and the touch points on the touch display panel 10 may be rectangular areas with a length and a width of other sizes.

Correspondingly, for example, the number of scan lines 102 connected to the output terminal a of 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 of the scan line 102 located at 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 at the middle of the touch display panel 10 is 40 to 60. Thus, edge touch sensing accuracy is improved. However, for the amorphous silicon liquid crystal display panel and the low temperature polysilicon liquid crystal display panel, or for the touch display panel 10 of different sizes, the number of scan lines 102 connected to the output terminal a of the scan line 102 located at the edge of the touch display panel 10 may be different, the number of scan lines 102 connected to the output terminal a of the scan line 102 located at the middle of the touch display panel 10 may be different, and similarly, the number of data lines 103 connected to the transmission terminal b may be different, and thus the present invention is not limited thereto, but only exemplified.

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, touch sensing accuracy is improved. However, the number of scan lines 102 connected to the output terminal a may be different for the amorphous silicon lcd panel and the low temperature polysilicon lcd panel, or for the touch display panel 10 of different sizes, and similarly, the number of data lines 103 connected to the transmission terminal b may be different, and thus the present invention is not limited thereto, but only exemplified.

In addition, besides the above-mentioned manner of setting the number of connection lines between the output terminal a and the scan lines 102 to achieve the effect of simultaneously outputting the touch sensing control signals 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 signals to at least two scan lines 102 once or simultaneously each time by means of software setting or combining software and hardware, which is not limited to be implemented by setting an output terminal a to connect at least two scan lines 102. Similarly, each data line 103 may be connected to only one transmission end b, and the touch sensing detection circuit 2013 may perform grouping calculation on the received touch sensing detection signals by using a software configuration or a combination of software and hardware, which is not limited to being implemented by setting a transmission end b to connect at least two data lines 103.

In the case of performing touch sensing, the plurality of first electrodes 101 are divided into a plurality of groups, and the plurality of first electrodes 101 of the same group are connected in parallel to each other; however, when the image display refresh is performed, the plurality of first electrodes 101 are connected in non-parallel.

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-capacitance touch sensing, and thus the touch display device 1 can realize true multi-point self-capacitance touch sensing. In addition, by providing different groups of the first electrodes 101 in different numbers, touch sensing accuracy at different positions on the touch display panel 10 is correspondingly set.

Referring to fig. 9 and fig. 3 together, fig. 9 is a schematic diagram of a touch sensing detection circuit 2013 shown in fig. 3. 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 connected to the second signal processing circuit 233 and a processing unit 235, respectively. The plurality of touch sensing detection units 232 are further connected to the plurality of transmission terminals b in a one-to-one correspondence manner, or each touch sensing detection unit 232 includes a node serving as the transmission terminal b.

In this embodiment, the touch sensing detection circuit 2013 includes one second signal processing circuit 233, and all the touch sensing detection units 232 share one second signal processing circuit 233. Alternatively, in other embodiments, the touch sensing detection circuit 2013 may also include a plurality of second signal processing circuits 233, and a portion of the touch sensing detection units 232 share a second signal processing circuit 233. In addition, each touch sensing detection unit 232 is not limited to be separately connected to a processing unit 235, and several touch sensing detection units 232 may be time-multiplexed with a processing unit 235.

The second signal processing circuit 233 is configured to output a touch sensing driving signal to the touch sensing detecting unit 232. The touch sensing detection unit 232 is configured to output a touch sensing driving signal to the data line 103, so as to further output the touch sensing driving signal to the first electrode 101 through the activated control switch 104, and perform self-capacitive touch sensing on the first electrode 101.

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 (for example, converting the voltage waveform of the touch sensing detection signal, converting the voltage waveform into the current waveform, converting the charge into the voltage), and outputs the processed signal to the processing unit 235. The processing unit 235 further processes (e.g., analog-to-digital converts) the input signal from the touch sensing detection unit 232 and calculates the touch coordinates.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of the touch sensing detection unit 232 and the processing unit 235 shown in fig. 9. 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 for switching on and off according to a predetermined time interval, so as to play a role in resetting (Reset) charges at two 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 transmitting terminal b, or the inverting terminal f1 is further used as the transmitting terminal b. The output g1 is connected to the processing unit 235.

When performing touch detection, the first operational amplifier P1 is in a short-dashed state, and the touch-sensing driving signal output by the second signal processing circuit 233 is output to the data line 103 through the in-phase terminal e1 and the anti-phase terminal f1, and is further output to the first electrode 101 through the activated control switch 104, so as to drive 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, so that a signal related to the touch sensing detection signal is correspondingly generated at the output terminal g1. The magnitude relation between the feedback capacitance Cf and the contact capacitance determines the magnitude of the amplitude variation of the signal generated at the output g1.

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 touch coordinates from the digital signals. The computing unit 2355 is connected to a main control chip 3, and is configured to output a signal representing the touch coordinates to the main control chip 3. The main control chip 3 correspondingly controls the electronic device 100 to execute corresponding functions according to the signals representing the touch coordinates.

It should be noted that the touch sensing detection unit 232 and the processing unit 235 shown in fig. 10 are not limited to the structure of the embodiment of the invention, and in other embodiments, the touch sensing detection unit 232 and the processing unit 235 may have other suitable structures. For example, it is also possible to add corresponding circuit modules or omit part of the circuit modules in the touch sensing detection circuit 2013 (specifically, 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 functions. 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 outputs the filtered signal to the analog-to-digital signal conversion unit 2351.

For another example, a level conversion unit may be further disposed between the calculation unit 2355 and the analog-to-digital signal conversion unit 2351, and the level conversion unit may be configured to level convert the digital signal output from the analog-to-digital signal conversion unit 2351 and output the level converted digital signal to the calculation unit 2355. The calculation unit 2355 calculates touch coordinates from the level-converted digital signal. For another example, the calculating unit 2355 and the level converting unit are interchanged, and accordingly, the analog-to-digital signal converting unit 2351 outputs the converted digital signal to the calculating unit 2355. It is also possible that the calculating unit 2355 calculates the touch coordinates according to the digital signals, and outputs the signals representing the touch coordinates to the level converting unit, and the level converting unit converts the received signals representing the touch coordinates, and outputs the converted signals to the main control chip 3, so that it is required to determine the voltage withstanding condition according to the calculating unit 2355 and the analog-digital signal converting unit 2351.

Referring to fig. 3 again, in general, the driving circuit 20 (similar to the driving circuit 50 shown in fig. 13 later) further includes a display processing circuit (not shown) and the level conversion unit (not shown), where the display processing circuit is configured to perform related 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 gray scale voltages. The level conversion circuit is configured to level-convert some signals in the driving circuit 20, for example, in addition to the level conversion of the signal representing the touch coordinates output by the computing unit 2355, the level conversion of the display data output by the display processing circuit may also be performed, and then the level-converted display data is output to the control circuit 205, so as to meet the signal transmission requirements between different voltage-withstanding circuit devices. The display data is preferably a digital signal.

Referring to fig. 10 and fig. 9, the touch sensing detection circuit 2013 may further include a third switch K3, and the third switch K3 is connected between the transmission terminal b and the touch sensing detection unit 232.

The touch sensing control circuit 2011 further controls the third switch K3 to be turned off after providing the touch sensing control signal to the scan line 102 and before providing the touch sensing driving signal to the first electrode 101 to perform self-capacitance touch sensing, so that the first electrode 101 connected to the same touch sensing detection unit 232 is shorted for a predetermined time.

The driving circuit 20 controls the third switch K3 to be turned off for the predetermined time, and then controls the third switch K3 to be turned on, and provides a predetermined voltage to the shorted first electrode 101, and the touch sensing detecting circuit 2013 starts to perform self-capacitive touch sensing on the first electrode 101 after the shorted first electrode 101 reaches the predetermined voltage. Thus, the effect of reducing power consumption can be achieved.

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

For example, the control circuit 205 is configured to control the closing and opening of the third switch K3. In addition, the third switch K3 is formed either on the touch display panel 10 or in a chip. When formed on the touch display panel 10, the third switch K3 is formed on the second substrate 107 of the touch display panel 10 together with the control switch 104, for example (the second substrate 107 is shown in fig. 4).

Referring to fig. 3, the driving circuit 20 further includes a first switch unit 208 and a second switch unit 209. The first switching unit 208 is disposed between the data driving circuit 2033 and the plurality of data lines 103, and is configured 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 disposed between the touch sensing detection circuit 2013 and the plurality of data lines 103, and is configured 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.

Further, the plurality of first switches K1 and the plurality of second switches K2 are controlled by the control circuit 205 to be closed or opened, for example. In addition, the first and second switching units 208 and 209 are formed either on the touch display panel 10 or in a chip. When formed on the touch display panel 10, the first and second switch units 208 and 209 are formed on the second substrate 107 of the touch display panel 10 together with the control switch 104, for example (the second substrate 107 is shown in fig. 4).

Referring to fig. 3, the driving circuit 20 further includes a selecting circuit 210. The selection circuit 210 is connected among the scan driving circuit 2031, the touch sensing control circuit 2011 and the scan lines 102, and is configured to select whether to output a scan signal or a touch sensing control signal to the scan lines 102.

In this embodiment, the selection circuit 210 includes a plurality of or gates M. Each or gate M comprises a first input h, a second input i, and an output 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 connected 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.

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, the second inputs i of which are connected to each other and to an output a.

Alternatively, the selection circuit 210 may also include other suitable output circuits such as logic gates, and is not limited to the or gate M described in this embodiment. In addition, similar to the arrangement of the first switch unit 208 between the data driving circuit 2033 and the plurality of data lines 103 and the arrangement of the second switch unit 209 between the touch sensing detection circuit 2013 and the plurality of data lines 103, the purpose of respectively controlling whether the scan driving circuit 2031 outputs the scan signal to the scan line 105 or the touch sensing control circuit 2011 outputs the touch sensing control signal to the scan line 102 may be achieved by arranging one switch unit between the scan driving circuit 2031 and the scan line 102 and another switch unit between the touch sensing control circuit 2011 and the scan line 102. Preferably, the control circuit 205 is configured to further control whether the scan driving circuit 2031 outputs a scan signal to the scan line 102 or the touch sensing control circuit 2011 outputs a touch sensing control signal to the scan line 102.

Further, the selection circuit 210 is formed either on the touch display panel 10 or in a chip. When formed on the touch display panel 10, the selection circuit 210 is formed on the second substrate 107 of the touch display panel 10 together with the control switch 104, for example.

Referring to fig. 11, fig. 11 is a schematic diagram illustrating a partial circuit structure of an embodiment of a touch display device 1. For clarity and brevity, emphasis is placed, and comparison with the circuitry of another embodiment below, only portions of the data driving circuit 2033 and the touch sensing detection circuit 2013 connected to a set of data lines 103 are shown in fig. 11. 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 configured to provide a gray scale 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, the output terminal g2 is further connected to the data line 103 through the first switch K1, and the non-inverting terminal e2 is connected to the first signal processing circuit 240, for receiving the gray scale voltage.

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.

When the image display refresh is performed, the second switch K2 is opened and the third switch K3 is closed, 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 gray-scale voltage to the first electrode 101 through the data line 103 to perform the image display refresh.

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 shorted with each other; then, the third switch K3 connected between each second switch K2 and the first operational amplifier P1 is closed, and when the third switch K3 is closed, for example, a predetermined voltage is provided to charge the first electrode 101, and then a touch sensing driving signal is provided to the first electrode 101 to perform self-capacitance touch sensing. It should be noted that the predetermined voltage may be provided to the first electrode 101 for discharging, and is not limited to charging. In addition, the plurality of third switches K3 may be omitted, and accordingly, the step of shorting the first electrode 101 and then supplying the predetermined voltage may be omitted.

Referring to fig. 12, fig. 12 is a schematic diagram of a partial circuit structure of another embodiment of the touch display device 1. The main differences from the partial circuit configuration shown in fig. 13 are: the touch sensing detection unit 232 shown in fig. 12 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 non-inverting terminal e2 through a seventh switch K7. The second signal processing circuit 233 is connected to the non-inverting terminal e2 through a 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 three second switches K2. The fourth switch K4 and the feedback capacitor Cf are connected between the inverting terminal f2 and the output terminal g 2. The output terminal g2 is connected to the data line 103 through the first switch K1.

When the image display refresh is performed, the control circuit 205 (see fig. 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.

Since the data driving circuit 2033 shares an operational amplifier with the touch sensing detecting circuit 2013, the product cost can be saved.

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

Referring to fig. 3, the operating principle of the touch display device 1 is as follows:

the driving circuit 20 and the plurality of first electrodes 101 are connected by wires in the following manner: in the image display refresh stage, the plurality of first electrodes 101 are electrically connected to the display driving circuit 203, and receive the gray scale voltages from the display driving circuit 203 to perform image display refresh; in the touch sensing stage, the plurality of first electrodes 101 are electrically connected to the touch driving circuit 201, and receive a touch sensing driving signal from the touch driving circuit 201 to perform self-capacitance touch sensing.

For example, in one embodiment, the same first electrode 101 is not simultaneously 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. Further, 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 the same time or at the same time.

Specifically, in a touch sensing stage, the touch driving circuit 201 provides a touch sensing driving signal to a part of the first electrodes 101, and drives the part of the first electrodes 101 to perform self-capacitance touch sensing until all the first electrodes 101 are provided with the touch sensing driving signal through a plurality of touch sensing stages sequentially performed, so as to perform self-capacitance touch sensing on all the first electrodes 101; and

after each touch sensing phase is finished, the display driving circuit 203 supplies gray scale voltages to the first electrodes 101 at the end of the touch sensing phase, and drives the first electrodes 101 to perform image display refresh.

The touch sensing phase and the image display refresh phase alternate, for example.

When the touch display panel 10 performs touch sensing, the touch driving circuit 201 simultaneously drives at least two rows of the first electrodes 101 at a time, for example, to perform self-capacitance touch sensing. Further, the touch driving circuit 201 may perform self-capacitive touch sensing by simultaneously driving at least two rows of the first electrodes 101 at a time. Wherein the at least two rows are adjacent or different, and when the at least two rows are different, the at least two rows are for example odd or even rows.

In addition, for a touch sensing stage, the touch driving circuit 201 may drive the plurality of rows of first electrodes 101 at a time to perform self-capacitance touch sensing, or may drive the plurality of rows of first electrodes 101 at a time to perform self-capacitance touch sensing several times. In the case where the self-capacitance is performed by driving the plurality of rows of the first electrodes 101 simultaneously in several times each time, the first electrodes 101 driven in several times are sequentially arranged first electrodes 101 without overlapping each other, but alternatively, the first electrodes 101 driven adjacent two times may be partially overlapped. In addition, the first electrodes 101 may be driven one row at a time, and at least two rows of the first electrodes 101 are not limited.

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.

Further, in an embodiment, the driving circuit 20 is configured to perform interlaced display refresh scanning and interlaced touch scanning on the plurality of first electrodes 101, so as to implement image display refresh and touch sensing. Accordingly, the display refresh frequency of the driving circuit 20 to the touch display panel 10 is the same as the touch sensing frequency, for example, both are 120 Hertz (HZ). For example, the control circuit 205 may select to convert the display data from progressive to interlaced in advance.

For clarity, the process of performing image display refresh and touch sensing on the touch display panel 10 is described as follows by way of example:

1. the first electrode 101 is displayed as completed; for example, the previous frame is displayed, and the next frame is started;

2. pre-starting a touch sensing stage, shorting the first electrodes 101 of the 2 nd, 4 th, … th and 52 th rows of even rows, and connecting the first electrodes 101 of the 2 nd, 4 th, … th and 52 th rows to a preset level after shorting for a preset time;

3. starting to perform self-capacitance touch sensing on the first electrodes 101 of the even-numbered rows 2, 4, …, 52;

4. display refreshing is performed on the first electrodes 101 of the 2 nd, 4 th, … th and 52 nd rows, on which self-capacitance touch sensing is performed;

5. pre-starting the next touch sensing stage, shorting the first electrodes 101 of the 54 th, 56 th, … th and 106 th rows of even-numbered rows, and connecting the first electrodes 101 of the 54 th, 56 th, … th and 106 th rows to a preset level after shorting for a preset time;

6. beginning to perform self-capacitive touch sensing on the first electrodes 101 of the 54 th, 56 th, … th, 106 th rows of the even numbered rows;

7. performing display refresh on the first electrodes 101 of the 54 th, 56 th, … th and 106 th rows, which have been subjected to self-capacitance touch sensing;

In accordance with the above steps, touch sensing and display refreshing for all the even-numbered row first electrodes 101 is completed, and then, similarly, touch sensing and display refreshing for all the odd-numbered row first electrodes 101 is completed.

Alternatively, the scanning order of the odd and even rows may be reversed.

However, the touch scan and the display refresh scan of the present invention are not limited to the above steps, and other modifications may be made, for example, between two adjacent touch sensing stages, after the display refresh of the first electrode 101 performing the previous touch sensing stage is completed, the next touch sensing stage may not be started immediately, or the next touch sensing stage may be started after the display refresh of the other first electrodes 101 is performed.

In addition, after the self-capacitive touch sensing is completed on the first electrodes 101 of all even (odd) rows, display refresh may be performed on the first electrodes 101 of all even rows; thereafter, self-capacitive touch sensing and display refresh are performed on the first electrodes 101 of all odd (even) rows.

Further, the display refresh may be performed after the self-capacitive touch sensing is completed for all the first electrodes 101.

Referring to fig. 1 again, the electronic device 100 further includes a main control chip 3, and fig. 10 also shows the main control chip 3. The main control chip 3 is connected with the touch display device 1. The main control chip 3 is used for carrying out data communication with the touch display device 1. The main control chip 3 is further configured to provide a power supply voltage to the touch display device 1. The main control chip 3 may be a single chip or a chipset. When the main control chip 3 is a chipset, the chipset includes an application processor (Application Processor, AP) and a power chip. In addition, the chipset may further include a memory chip. Further, the application processor may also be a central processing unit (Central Processing Unit, CPU).

The main control chip 3 includes a grounding terminal 33, where the grounding terminal 33 is connected to the equipment ground, receives a grounding signal of the equipment ground, and the grounding signal is denoted by GND in fig. 1. The device ground is also referred to as a system ground, for example, as the negative electrode of a power supply, such as a battery, of the electronic device 100. The ground signal GND is also called a system ground voltage, a system ground signal, a device ground voltage, a device ground signal, or the like. The ground signal GND is a constant voltage, and is a voltage signal such as 0V (volt), 2V, or (-1) V, for example, as a voltage reference for each circuit in the electronic device 100. Typically, the equipment ground is not earth ground or absolute ground. However, when the electronic device 100 is connected to the earth's earth ground by a conductor, the device ground may also be the earth's earth ground.

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

The touch display panel 10 further includes a ground line 112, and the ground line 112 is connected to the first ground 251. Alternatively, the ground line 112 may be directly connected to the equipment ground or the ground 33 or the second ground 253.

The ground line 112 receives a ground signal GND when the touch display device 1 performs image display refresh and touch sensing.

In the above embodiments, the electronic device 100 uses a domain as a voltage reference. The domain is a domain with reference to the ground signal GND.

Referring to fig. 13, fig. 13 is a schematic structural diagram of an electronic device according to another embodiment of the invention. The electronic device 400 and the electronic device 100 may be substantially the same in structure, for example, the structures of the touch display panel 40 and the touch display panel 10 are the same or similar, the structures of the main control chip 6 and the main control chip 3 are the same or similar, the connection relationship between the driving circuit 50 and the main control chip 6 and the connection relationship between the driving circuit 20 and the main control chip 3 are the same or similar, and the connection relationship between the driving circuit 50 and the touch display panel 40 and the connection relationship between the driving circuit 20 and the touch display panel 10 are the same or similar.

The main differences between the electronic device 400 and the electronic device 100 are that: the driving circuit 50 of the touch display device 4 of the electronic device 400 is different from the driving circuit 20 of the touch display device 1 of the electronic device 100 in structure and operation principle, and when the touch display panel 40 performs touch sensing, the signal output by the driving circuit 50 to the touch display panel 40 is integrally and uniformly modulated, so as to improve the signal-to-noise ratio.

Specifically, the drive circuit 50 further includes a modulation circuit 506 as compared to the drive circuit 20. The modulation circuit 506 is configured to generate a modulation signal for modulating an input signal provided to the touch display panel 40 by the touch driving circuit 501. The input signal varies with the modulation signal. In this embodiment, the input signal increases with an increase in the modulation signal and decreases with a decrease in the modulation signal. However, in other embodiments, the change relationship between the input signal and the modulation signal may be other suitable change relationships.

Since the modulation scheme is adopted, in addition to the modulation circuit 506, some circuits or elements related to the modulation circuit 506 are correspondingly added in the driving circuit 50, and in addition, some circuit structures in the driving circuit 50 are correspondingly different from those in the driving circuit 20 for realizing the same or similar functions, which will be obvious from the following description of this embodiment.

Note that, the same or similar structures in the electronic device 400 and the electronic device 100 are denoted by different reference numerals, for example, the touch display panel 10 and the touch display panel 40 are the same or similar in structure, but are denoted by different reference numerals; the same or similar circuits in the driving circuit 50 and the driving circuit 20 are also provided with different reference numerals, etc., only for making the reference numerals look more logical and more regular, and are not limited to the different structures indicated by the different reference numerals. Accordingly, the same structure of the electronic device 400 as that of the electronic device 100 is not described in detail herein. The main differences between the electronic device 400 and the electronic device 100 are explained below. Similarly, the foregoing applies to the following electronic device 900.

The input signals include the touch sensing control signal, the touch sensing driving signal, the second common voltage, and the third common voltage.

The magnitude of 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, correspondingly the same as the magnitude of the amplitude variation of the modulation signal.

The touch sensing control signal, the touch sensing driving signal, the second common voltage and the third common voltage are all in the same amplitude and frequency as the modulation signal, and the phases of the touch sensing control signal, the touch sensing driving signal, the second common voltage and the third common voltage have certain delay relative to the phase of the modulation signal.

In this embodiment, the modulation signal is a periodically varying square wave pulse signal. However, in other embodiments, the modulated signal may be a non-periodically varying signal, or may be a sine wave or a trapezoidal wave, or other suitable waveform signal.

In the present embodiment, in the touch sensing stage, the modulation circuit 506 modulates the ground of a part of the circuits in the touch driving circuit 501 and the ground of the touch display panel 40, so as to uniformly modulate the input signal of the touch display panel 40 as a whole. However, in other embodiments, the modulation circuit 506 may 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.

In contrast, in the image display refresh stage, 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.

More specifically, the driving circuit 50 further includes a voltage generating circuit 51, a plurality of signal transmitting terminals 551, and a first power source terminal 554. The voltage generating circuit 51 is connected to the modulating circuit 506, and is configured to provide a driving signal to the modulating circuit 506. The modulation circuit 506 is further coupled between a first ground 552 and a second ground 553. The first ground 552 is further connected to the ground line 412. The signal transmission terminal 551 is connected to the common voltage generating circuit 507, the first switching unit 508, the selecting circuit 510, and the second switching unit 509, and is configured to output a gray-scale voltage to the first electrode 401, a touch sensing control signal to the scan line 402, a touch sensing driving signal to the first electrode 401, 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 from the first electrode 401. It should be noted that the signal transmitting terminal 551 includes an output terminal a and a transmitting terminal b of the driving circuit 20 of the electronic device 100.

The main control chip 6 comprises a power supply end 61 and a grounding end 63. The ground 63 is connected to the equipment ground, the second ground 553. The power supply terminal 61 is connected to the first power supply terminal 554. A communication interface (not labeled) is further provided between the main control chip 6 and the driving circuit 50 for information communication.

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

In the touch sensing stage, the modulation circuit 506 generates a modulation signal (denoted by MNGD in fig. 13) according to the ground signal GND on the second ground terminal 553 and the driving signal of the voltage generating circuit 51, and outputs the modulation signal MGND to the first ground terminal 552. The first ground 552 outputs the modulated signal MNGD to the ground line 412. The driving signal is, for example, higher than the ground signal GND. For example, the ground signal GND is 0V, and the driving signal is 2V. However, the grounding signal is 0V, the driving signal is 2V, and the corresponding amplitude can be adjusted according to the product condition, which is not limited by the present invention. The ground (including the first ground 552 and the ground line 412) to which the modulated signal MGND is applied at the time of touch sensing is defined as a modulated ground to distinguish the device ground to which the ground signal GND is applied. Alternatively, in other embodiments, the modulation circuit 506 may directly output the modulation signal MGND to the ground line 412, and is not limited to outputting the modulation signal MGND to the ground line 412 via the first ground 552.

Accordingly, in the touch sensing phase, the electronic device 400 uses two domains as voltage reference. The two domains are shown as a domain 480 referenced to the ground signal GND and a domain 490 referenced to the modulated signal MGND, respectively. The ground terminals of the circuits in the domain 480 are directly connected to the device ground, and the ground terminals of the circuits in the domain 490 are directly connected to the modulation signal MGND. Further, for a circuit with modulation ground being ground, its reference ground potential is the modulation signal MGND loaded by modulation ground; for a circuit with device ground as ground, its reference ground potential is the ground signal GND loaded by the device ground.

That is, in the touch sensing phase, the ground signal GND is modulated as the modulated signal MGND, and all signals referenced to the modulated signal MGND loaded by the ground are modulated by the modulated signal MGND.

Further, during the image display refresh phase, the modulation grounds (552, 412) are electrically connected to the second ground 553 connected to the device ground through the first active switch 561 (fig. 13 and 14 are combined), and the second active switch 563 is in an off state, and accordingly, during the image display refresh phase, the modulation circuit 506 outputs the ground signal GND to the first ground 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, at the time of image display refresh, the electronic device 400 actually adopts one field 480 with reference to GND.

Referring 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 configured to perform corresponding processing (e.g. compression, storage, decompression, color conversion, etc.) on the display data from the main control chip 6. The level conversion unit 5353 is disposed between the display processing circuit 504 and the control circuit 505, and is configured to level-convert 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 corresponding display data and timing signals to the display driving circuit 503. The display driving circuit 503 converts the received display data into gray scale voltages, and outputs the gray scale voltages to the corresponding first electrodes 101 through the first switching unit 508 according to the timing signals to perform image display refresh. The display data is preferably a digital signal.

If the modulation scheme is not adopted, if the signal between the display processing circuit 504 and the control circuit 505 does not need to be level-converted, a level conversion unit is not required between the display processing circuit 504 and the control circuit 505, but in the modulation scheme, since the voltage reference of the domain 480 and the domain 490 are different, the level conversion is required.

The level conversion unit 5353 is further disposed between the calculation unit 5355 and the analog-to-digital signal conversion unit 5351, and is configured to level convert the digital signal output from the analog-to-digital signal conversion unit 5351 and output the level converted digital signal to the calculation unit 5355 to obtain touch coordinates.

In the present embodiment, the division of each circuit block or circuit unit in the driving circuit 50 in the two domains 480, 490 is 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 generation circuit 507, and the touch display panel 40 are all divided in a domain 490 based on MGND; dividing the modulation circuit 506, the display processing circuit 504, the calculation unit 5355, and the voltage generation circuit 51 into a domain 480 with GND as a reference; the level shifter 5353 spans two domains, namely, a part in the domain 480 and a part in the domain 490, and it is determined by those skilled in the art according to the description and the circuit principle of the present application that the level shifter 5353 is located in the domain 480 and the domain 490, respectively, which will not be described herein.

The specific structure and the connection relation and the function of the circuit modules or circuit units in the driving circuit 50 and the same names as those in the driving circuit 20 are not described herein, and the specific reference is made to the foregoing driving circuit 20. In addition, only a part of a touch sensing detection circuit (not shown) is shown in fig. 13, and in practice, the touch sensing detection circuit includes a plurality of touch sensing detection units 532, a plurality of third switches K3, a plurality of analog-to-digital signal conversion units 5351, and a plurality of calculation units 5355. The corresponding reference is made to the touch sensing detection circuit 2013.

Alternatively, the dividing manner of the driving circuit 50 in the two domains 480 and 490 according to the present invention may include various cases, 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-digital signal conversion unit 5351 may be disposed in the domain 480.

For another example, the computing unit 5355 may also be disposed in the field 490. Note that, when the calculation unit 5355 is provided in the domain 490 and the digital signal output from the analog-to-digital signal conversion unit 5351 to the calculation unit 5355 needs to be level-converted, the part of the level conversion unit for level-converting the digital signal may be provided entirely in the domain 490. Accordingly, as described above, the modulation circuit 506 modulates the ground of all the circuits in the touch driving circuit 501 and the ground of the touch display panel 40.

It should be further noted that the signal output from the domain 480 to the domain 490 is modulated by the modulation signal MGND, and correspondingly, the signal output from the domain 490 to the domain 480 is also modulated accordingly, for example, the opposite modulation to the modulation signal MGND, etc.

Since the input signal of the touch display panel 40 is integrally and uniformly modulated by the modulation signal MGND when performing touch sensing, the signal-to-noise ratio of the touch display device 4 can be improved, and thus the touch sensing accuracy can be improved.

Referring to fig. 14, fig. 14 is a schematic diagram of an embodiment of the modulation circuit 506 shown in fig. 13. 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 end S2 of the first active switch 561 is connected to the first transmission end S3 of the second active switch 563, and defines an output node N on the connection line, the first transmission end S1 of the first active switch 561 receives the first reference signal, the second transmission end S4 of the second active switch 563 receives the second reference signal, and the control unit 565 alternately outputs the first reference signal and the second reference signal through the output node N by controlling the first active switch 561 and the second active switch 563 to form a modulation signal.

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.

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

The working principle of the modulation circuit 506 is as follows: in the touch sensing phase, the control unit 565 is configured to control the modulation circuit 506 to output a modulation signal MGND to the first ground 552; in the image display refresh stage, the control unit 565 is configured to control the modulation circuit 506 to output the ground signal GND to the first ground terminal 552.

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 may be any one of the following five conditions:

first: the voltage of the first reference signal is 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 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 different from the absolute value of the voltage of the second reference signal;

fourth,: the voltages of the first reference signal and the second reference signal are positive voltages with different magnitudes;

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

The first reference signal and the second reference signal are constant voltage signals, for example. The modulation signal is a periodically varying square wave signal in which a first reference signal and a second reference signal alternate.

The circuit configuration of the modulation circuit 506 is not limited to the above embodiment, and may be any other suitable circuit configuration.

It should be further noted that, for the touch display device 1, the electronic apparatus 100 has only one reference domain with the ground signal GND as a reference, 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 apparatus 400 has a reference domain with the ground signal GND as a reference and a reference domain with the modulated signal MGND as a reference, 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.

When the electronic device 400 uses the two domains 480 and 490 with GND and MGND as references, not only the input signal of the touch display panel 40 is integrally and uniformly modulated, so that the signal-to-noise ratio is improved, but also some circuit structures of the touch driving circuit 501 in the domain 490 are correspondingly simplified, so that the circuit structures can be simplified, and the product cost is saved. For example, the second signal processing circuits 233 and 533 are described as an example.

Referring to fig. 15 and 16, fig. 15 is a schematic circuit diagram of an embodiment of the second signal processing circuit 233 when the electronic device 100 uses only one domain with GND as a reference, and fig. 16 is a schematic circuit diagram of an embodiment of the second signal processing circuit 533 when the electronic device 400 uses two domains 480, 490 with GND and MGND as a reference. 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 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 end e1. One end of the second switch K2a is connected between the first switch K1a and the in-phase end e1, and the other end is connected to the device ground for loading the ground signal GND. By controlling the alternate conduction of the first switch K1a and the second switch K2a, a touch sensing driving signal is correspondingly generated to the in-phase terminal e1. Wherein the power supply terminal VDD1 is kept constant with respect to the device ground GND. The power supply terminal VDD1 is, for example, a first power supply terminal 554, but is not limited to the first power supply terminal 554, and may be any other suitable power supply terminal.

In contrast, the second signal processing circuit 533 includes a current source Ib and a resistor Rb, which are connected in series between the power supply terminal VDD2 and the modulation ground for loading the modulation signal MGND. The non-inverting terminal e1 is connected between the current source Ib and the resistor Rb. The power supply terminal VDD2 is, for example, a second power supply terminal 555 described below. Since the modulation signal MGND on the modulation ground is changed, the output voltages among the power supply terminal VDD2, the current source Ib and the resistor Rb are all changed along with the change of the modulation signal MGND on the modulation ground, so as to correspondingly generate the touch sensing driving signal to the in-phase terminal e1. In addition, a capacitance may be added between, for example, the modulation ground MGND and the power supply terminal VDD2 to maintain the stability of the signal.

The structure of the second signal processing circuit 533 is simplified compared to the second signal processing circuit 233, and the touch sensing driving signal generated by the second signal processing circuit 533 is stabilized compared to the touch sensing driving signal generated by the second signal processing circuit 233.

Referring 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 configured to control a slope of a modulation signal output by the modulation circuit 506 to reduce electromagnetic interference (EMI). The slope controller 55 is provided in a field 480 with reference to GND, for example.

Referring to fig. 13 again, in the present embodiment, since a part of the driving circuit 50 is in the domain 480 with GND as a reference and a part is in the domain 490 with MGND as a reference, there is a possibility that the current in the domain 490 is reversely fed to the domain 480, and in order to prevent this, the electronic device 400 further includes a protection circuit 53, and the protection circuit 53 is disposed between the domain 480 and the domain 490.

Specifically, the drive circuit 50 further includes a second power terminal 555 in the domain 490. The protection circuit 53 is disposed between the first power terminal 554 and the second power terminal 555. When the modulation signal MGND is a driving signal, the protection circuit 53 correspondingly disconnects the first power supply terminal 554 from the second power supply terminal 555; when the modulation signal MGND is the 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.

Referring to fig. 17, fig. 17 is a circuit schematic diagram of the protection circuit 53. In the present embodiment, the protection circuit 53 includes a diode D1. An anode of the diode D1 is connected to the first power terminal 554, and a cathode of the diode D1 is connected to the second power terminal 555.

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 to which the ground signal GND is applied, and the second capacitor C2 is connected between the cathode of the diode D1 and the modulation ground to which the modulation signal MGND is applied. Wherein the first capacitor C1 and the diode D1 are disposed in the domain 480, and the second capacitor C2 is disposed in the domain 490.

The protection circuit 53 is not limited to the above embodiments, for example, refer to fig. 18, and fig. 18 is a schematic structural diagram of another embodiment of the protection circuit 53. For clarity of distinction of the protection circuit 53 shown in fig. 17, the protection circuit shown in fig. 18 is denoted by 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 supply terminal 554, and the second transmission terminal S6 is connected to the second power supply 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 first power supply terminal 554 from the second power supply terminal 555; when the modulation signal MGND is the 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 supply terminal 554 and the second power supply terminal 555. The third active switch 571 is, for example, a thin film transistor, a triode, or a mosfet.

In addition, the protection circuit 53a preferably further includes a first capacitor C1 and a second capacitor C2. 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.

In particular, the technical solution of using modulation ground is also applicable to other suitable types of structures of the touch display panel when performing touch sensing, and is not limited to the structure of the touch display panel 40. For example, as shown in fig. 19, the self-capacitive touch screen includes a plurality of first electrodes 401, each of the first electrodes 401 is connected to a driving circuit (not shown) through a separate data line 403, that is, a control switch 404 and a scan line 402 in the touch display panel 40 shown in fig. 13 are saved, but the number of the data lines 403 needs to be increased, each of the first electrodes 401 is separately connected to one data line 403, and in addition, the size of the first electrode 401 is increased, so that the sensing accuracy of the touch display device including the self-capacitive touch display screen can be improved by adopting a modulation scheme.

Alternatively, in other embodiments, the modulation circuit 506 may also perform the overall uniform modulation on the input signal of the touch display panel 40 by modulating the power supply or the reference power supply in the driving circuit 50, and not by limiting the modulation on the device. For example, one end of the modulation circuit 506 for outputting a modulated signal is a modulation end. The modulation terminal may be connected to or used as the second power terminal 555 (when modulating the power supply) in addition to the first ground terminal 552 (when modulating the ground). When connected or used as the second power terminal 555, the modulation circuit 506 is connected between the first power terminal 554 and the second power terminal 555. The second power terminal 555 is also referred to as a power supply terminal with respect to the first ground terminal 552, and the voltage applied thereto is kept constant.

In addition, the driving circuit 50 generally includes a reference power terminal (not shown) in addition to the second power terminal 555 and the first ground terminal 552, wherein the reference power terminal is used for loading a third power voltage having a level between the first power voltage and the second power voltage when the second power terminal 555 is used for loading a first power voltage and the first ground terminal 552 is used for loading a second power voltage, and the differential pressure between the first power voltage and the second power voltage is kept constant. The reference power supply terminal may also be used as or connected to the modulation terminal. That is, one of the power supply terminal, the reference power terminal, and the first ground terminal serves as or is connected to the modulation terminal, and correspondingly, the power supply voltage serving as or connected to the modulation terminal includes a modulation signal.

Accordingly, in the image display refresh stage, the modulation end is loaded with a constant voltage, and the driving circuit 50 provides gray scale voltages to the plurality of first electrodes 401 through the signal transmission end 551, so as to drive the first electrodes 401 to perform image display; in the touch sensing stage, the modulation end loads a modulation signal, and the driving circuit 50 provides a touch sensing driving signal to the plurality of first electrodes 401 through the signal transmission end 551 to drive the first electrodes 401 to perform self-capacitance touch sensing, wherein the touch sensing driving signal increases along with the increase of the modulation signal and decreases along with the decrease of the modulation signal.

The control unit 565 (see fig. 14) is configured to control the modulation circuit 506 to output the constant voltage to a modulation terminal during a refresh period of image display; the modulation circuit 506 is controlled to output a modulation signal to a modulation terminal during a touch sensing phase.

Referring to fig. 20, fig. 20 is a schematic diagram of a common voltage generating circuit 507. The common voltage generation circuit 507 includes a first circuit 5071, a second circuit 5072, and a third circuit 5073. Wherein the first circuit 5071 is configured to generate a first common voltage, the second circuit 5072 is configured to generate a second common voltage, and the third circuit 5073 is configured to generate a third common voltage. The ground of the first circuit 5071 is connected between the modulation circuit 506 and a first ground 552. The ground of the second circuit 5072 is connected between the modulation circuit 506 and the first ground 552. The ground of the third circuit 5073 is connected between the modulation circuit 506 and the first ground 552.

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, and it should be noted that, although the ground terminal of the first circuit 5071 is connected between the modulating circuit 506 and the first ground terminal 552, the modulating circuit 506 only outputs the ground signal GND to the first ground terminal 552 in this stage; in the touch sensing stage and in the touch display device 4 in the bright screen working state, the second circuit 5072 is further electrically connected to the second electrode 405, and provides a second common voltage to the second electrode 405; in the touch sensing stage and in the touch display device 4 in the idle state of the black screen, the third circuit 5073 is electrically connected to the second electrode 405, and provides 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 552.

When the first common voltage is a constant voltage, the first circuit 5071 and the second circuit 5072 may be the same circuit, respectively. Since the first circuit 5071 is actually connected to the device ground at the time of image display refresh and connected to the modulation ground at the time of touch sensing, the first circuit 5071 outputs a constant first common voltage at the time of image display refresh, and the constant first common voltage is modulated by the modulation signal MGND to correspond to a varying second common voltage at the time of touch sensing, and a voltage difference between the second common voltage and the touch sensing driving signal is maintained unchanged. In this way, the second circuit 5072 can be saved.

Similarly, the third circuit 5073 is preferably the same circuit as the second signal processing circuit 533. Thus, the third circuit 5073 is further saved.

Referring to fig. 20 again, the 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 or not the eighth switch K8, the ninth switch K9, and the tenth switch K10 are turned on, it is correspondingly controlled which common voltage is output to the second electrode 405.

Alternatively, the second common voltage may also be a modulated signal, and accordingly, the second circuit 5073 includes a ninth switch K9 connected between the second electrode 405 and the first ground 552.

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

Referring to fig. 21, fig. 21 is a diagram illustrating a 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 552.

Preferably, the second circuit 5072 includes a plurality of buffers R respectively connected at different positions between the second electrode 405 and the first ground 552. For example, the second electrodes 405 are equally spaced around the circumference, but are not limited to being equally spaced. Thereby, the stabilization of the second common voltage is ensured. In the present embodiment, no other element is connected between the buffer R and the first ground 552, but alternatively, in other embodiments, a voltage generating circuit is connected between the buffer R and the first ground 552, and the voltage generated by the voltage generating circuit increases with an increase in the modulation signal MGND and decreases with a decrease in the modulation signal MGND.

Similarly, the first circuit 5071 and the third circuit 5073 may each include a plurality of buffers R and are respectively connected between the second electrode 405 and the first ground 552 at different positions.

Referring to fig. 13 and 22, fig. 22 is a schematic diagram illustrating a structure of the display processing circuit 504 shown in fig. 13. 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 this order. The compression circuit 5035 is further connected to the main control chip 6 via a high-speed interface 5040. The color conversion circuit 5039 is further connected to the control circuit 505 through a level conversion unit 5353.

The compression circuit 5035 is configured to receive the 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, such as Gamma correction, on the received display data, and outputs the converted display data to the level conversion unit 5353. The level conversion unit 5353 level-converts the received display data and outputs the level-converted display data to the control circuit 505.

The control circuit 505 outputs corresponding display data and timing signals to the data circuit 5033, and further outputs timing signals to the scan driving circuit 5031. The scan driving circuit 5031 correspondingly 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 gray scale voltages, and outputs corresponding gray scale voltages to the corresponding data lines 503 according to the timing signals to perform image display refresh.

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

Note that, when the modulation mode is adopted, the first electrode 401 is not limited to a pixel electrode, but may be a common electrode, and when the first electrode is a common electrode, the second electrode is a pixel electrode, and of course, the positions of the two types of electrodes are also adjusted correspondingly. When the common electrode is used as the self-capacitive touch sensing electrode, the driving circuit 50 correspondingly provides the common voltage to the first electrode 401 to perform the image display refresh. That is, when the modulation ground is adopted, the driving circuit 50 provides the corresponding display voltage to the first electrode 401 to perform the image display refresh according to whether the pixel electrode or the common electrode is the self-capacitance touch sensing electrode. The display voltage is a gray scale voltage or a common voltage.

Referring back to fig. 2, it should be understood that, for the plurality of first electrodes 101 of the touch display surface 10, the touch sensing phase and the image display refresh phase are performed in a time-sharing manner, that is, one first electrode 101 performs the touch sensing while the other first electrode 101 performs the image display refresh at a non-same time. However, as described above, when not all the display electrodes 11 on the touch display panel 10 are the first electrodes 101, the states of the display electrodes 11 that are not used as the first electrodes 101 do not affect the definition of the touch sensing stage and the image display refresh stage described above. In other words, the display electrode 11, which is not used as the first electrode 101, may perform image display refresh while in the touch sensing stage. However, in this case, the display electrode 11, which does not serve as the first electrode 101, and the first electrode 101 do not multiplex the same data line 103.

Alternatively, in some embodiments, when one first electrode 101 performs touch sensing, the other first electrode 101 may also perform image display refresh at the same time, and accordingly, the number of the control switches 104, the scan lines 102, and the data lines 103 needs to be further increased on the touch display panel 10, such as the electronic device 900 shown in fig. 23.

Referring to fig. 23, fig. 23 is a schematic view of a part of the structure of an electronic device according to another embodiment of the 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 greater 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 foregoing embodiment. In particular, the number of the scan lines 902 and 902a, the data lines 903 and 903a, and the control switches 904 and 904a of the touch display panel 90 of the electronic device 900 is twice the number of the scan lines 102, the data lines 103, and the control switches 104 of the touch display panel 10 of the electronic device 100 of the foregoing embodiment, and the number of the data lines 903 of the touch display panel 90 of the electronic device 900 is preferably the same as the number of the transmission terminals b of the touch sensing detection circuit (not shown).

The scan line 902a, the data line 903a, and the control switch 904a are newly added elements. The newly added scanning line 902a and the newly added data line 903a are connected to the newly added control switch 904a, respectively, 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 operate when the first electrode 901 performs touch sensing, i.e., the image display refresh of the touch display panel 90 multiplexes the first electrode 901 with the touch sensing without multiplexing the scan line 902, the data line 903, and the control switch 904.

Due to the above-described change in the structure of the touch display panel 90, accordingly, while one first electrode 901 performs touch sensing, the other first electrode 901 may simultaneously perform image display refresh. Accordingly, in this embodiment, the touch sensing phase and the image display refresh phase may be performed simultaneously or overlapping 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.

Further, for the embodiment in which the touch sensing phase and the image display refresh phase are performed simultaneously, the common voltage of the second electrode 905 is, for example, a constant voltage. Of course, for a scheme of modulating ground, the common voltage is a function of the modulated signal.

However, in the above embodiments of the present invention, the touch sensing stage and the image display refresh stage are preferably performed in a time-sharing manner.

It should be noted that, for the modulated-ground scheme, it is preferable that when one first electrode 901 performs touch sensing, the other first electrode 901 does not perform image display refresh at the same time, that is, for the modulated-ground scheme, the touch display panel 90 performs the image display refresh stage and the touch sensing stage preferably in a time-sharing manner. More preferably, for the scheme of modulating ground, all display electrodes of the touch display panel 90 are used as the first electrode.

Although the embodiments have been described herein with respect to particular configurations and sequences of operations, it should be understood that alternative embodiments may add, omit, or alter elements, operations, or the like. Accordingly, the embodiments disclosed herein are meant to be examples and not limiting.

Claims

1. A touch display device of an electronic apparatus, comprising:

a touch display panel including a plurality of first electrodes; and

a driving circuit, comprising:

a display driving circuit for driving the plurality of first electrodes to perform image display refresh;

A first ground terminal;

the modulating circuit is connected between the first grounding end and the second grounding end and is used for generating a modulating signal when the touch driving circuit drives the touch display panel to execute self-capacitance touch sensing and outputting the modulating signal to the first grounding end, and the modulating signal is used for modulating an input signal provided by the touch driving circuit to the touch display panel; the modulating circuit outputs a grounding signal to the first grounding end when the display driving circuit drives the touch display panel to execute image display refreshing;

the grounding wire is connected with the first grounding end, and receives the grounding signal when the touch display device executes image display refreshing and touch sensing.

2. The touch display device of claim 1, wherein: the modulation circuit generates the modulation signal according to the grounding signal and a driving signal different from the grounding signal.

3. The touch display device of claim 2, wherein: the modulation circuit comprises a control unit, a first active switch and a second active switch, wherein the first active switch comprises a control electrode, a first transmission electrode and a second transmission electrode, the second active switch comprises a control electrode, a first transmission electrode and a second transmission electrode, the control electrode of the first active switch and the control electrode of the second active switch are respectively connected with the control unit, the first transmission electrode of the first active switch is connected with a second grounding end, the second transmission electrode of the first active switch is connected with the first transmission electrode of the second active switch, the second transmission electrode of the second active switch is connected with a voltage generation circuit and is used for receiving a driving signal generated by the voltage generation circuit, a node is defined between the second transmission electrode of the first active switch and the first transmission electrode of the second active switch, and the control unit correspondingly controls whether the node outputs a grounding signal driving signal or not by controlling the first active switch and the second active switch.

4. The touch display device of claim 2, wherein: the input signals include touch sensing driving signals, and the touch driving circuit is used for outputting the touch sensing driving signals to the first electrode to perform self-capacitance touch sensing, wherein the touch sensing driving signals rise along with rising of the modulation signals and fall along with falling of the modulation signals.

5. The touch display device of claim 2, wherein: the touch display panel further includes:

a plurality of scan lines;

a plurality of data lines; and

6. The touch display device of claim 5, wherein: the touch driving circuit includes:

7. The touch display device of claim 6, wherein: the display driving circuit comprises a grounding end, the grounding end of the display driving circuit is connected between the modulating circuit and the first grounding end, the display driving circuit outputs scanning signals to the scanning lines, activates a control switch connected with the scanning lines, provides gray scale voltages to the first electrode through the data lines and the activated control switch, and drives the first electrode to execute image display refreshing.

8. The touch display device of claim 7, wherein: the driving circuit further comprises a control circuit, wherein the control circuit is used for controlling the working time sequence of the display driving circuit and the touch driving circuit, the control circuit comprises a grounding end, and the grounding end of the control circuit is connected between the modulating circuit and the first grounding end.

9. The touch display device of claim 5, wherein: the touch display panel further comprises a second electrode, the driving circuit further comprises a common voltage generating circuit, the common voltage generating circuit comprises a grounding end, the grounding end of the common voltage generating circuit is connected between the modulating circuit and the first grounding end, and the common voltage generating circuit is used for providing common voltage for the second electrode and driving the touch display panel to display images in cooperation with the first electrode.

10. The touch display device of claim 8, wherein: the driving circuit further comprises a display processing circuit and a level conversion unit, wherein the level conversion unit is connected between the display processing circuit and the control circuit; the display processing circuit comprises a grounding end, and the grounding end of the display processing circuit is connected between the second grounding end and the modulation circuit; the display processing circuit is used for receiving display data from a main control chip of the electronic equipment, correspondingly processing the display data and outputting the processed display data to the level conversion unit; the level conversion unit comprises two grounding ends, wherein one grounding end of the two grounding ends is connected between the second grounding end and the modulation circuit, and the other grounding end of the two grounding ends is connected between the modulation circuit and the first grounding end; the level conversion unit performs level conversion on the display data from the display processing circuit and outputs the level-converted display data to the control circuit.

11. The touch display device of claim 10, wherein: the control circuit outputs corresponding display data and time sequence signals to the display driving circuit, and the display driving circuit converts the received display data into gray scale voltages and outputs the gray scale voltages to corresponding first electrodes according to the time sequence signals.

12. The touch display device of claim 6, wherein: the touch sensing detection circuit includes:

13. The touch display device of claim 12, wherein: the driving circuit further comprises a level conversion unit, wherein the level conversion unit comprises two grounding ends, one grounding end of the two grounding ends is connected between the second grounding end and the modulating circuit, and the other grounding end is connected between the modulating circuit and the first grounding end;

The touch sensing detection circuit further includes:

a calculation unit;

the touch sensing detection unit outputs a touch driving signal to the first electrode, receives the touch sensing detection signal output by the first electrode, correspondingly processes the received touch sensing detection signal, and outputs the processed touch sensing detection signal to the analog-digital signal processing unit, and the analog-digital signal processing unit performs analog-digital signal conversion on the received touch sensing detection signal from the touch sensing detection unit and outputs the corresponding digital signal to the level conversion unit; the level conversion unit performs level conversion on the digital signal and outputs the digital signal after the level conversion to the calculation unit; the calculating unit calculates the touched position of the touch display panel according to the received digital signal.

14. The touch display device of claim 13, wherein: the computing unit comprises a grounding end, and the grounding end of the computing unit is connected between the modulating circuit and the first grounding end or between the modulating circuit and the second grounding end.

15. The touch display device of claim 7, wherein: the display driving circuit comprises a scanning driving circuit and a data driving circuit, wherein the scanning driving circuit is used for providing scanning signals, and the data driving circuit is used for providing gray scale voltages; the touch sensing detection circuit comprises a plurality of transmission ends, wherein the transmission ends are used for outputting touch sensing driving signals to the data lines.

16. The touch display device of claim 15, wherein: the touch sensing detection circuit further comprises a plurality of third switches, each third switch comprises a grounding end, the grounding ends of the third switches are connected between the modulation circuit and the first grounding ends, and the plurality of third switches are connected with the plurality of transmission ends in a one-to-one correspondence manner;

the driving circuit further includes:

the second switch unit is arranged between the touch sensing detection circuit and the data lines and comprises a plurality of second switches, each data line is connected with a transmission end through a second switch, each second switch comprises a grounding end, and the grounding end of each second switch is connected between the modulation circuit and the first grounding end.

17. The touch display device of claim 16, wherein: a third switch is connected with at least two second switches.

18. The touch display device of claim 15, wherein: the driving circuit further comprises a selection circuit which is arranged between the touch sensing control circuit and the scanning driving circuit and used for selecting whether to output scanning signals or touch sensing control signals to the scanning lines, wherein the selection circuit comprises a grounding end, and the grounding end of the selection circuit is connected between the modulation circuit and the first grounding end.

19. An electronic device comprising the touch display device of any one of claims 1-18.