Touch-control driving circuit and driving method therefor, and display apparatus

Abstract

A touch-control driving circuit and a driving method therefor, and a display apparatus. The touch-control driving circuit comprises a plurality of first touch-control signal ends, a plurality of second touch-control signal ends and a plurality of analog front-end circuits, wherein the number of first touch-control signal ends is greater than the number of second touch-control signal ends, and the number of analog front-end circuits is equal to the number of second touch-control signal ends; each of at least one analog front-end circuit is connected to at least two first touch-control signal ends, and each analog front-end circuit connected to at least two first touch-control signal ends is configured to receive first touch-control detection signals from the at least two first touch-control signal ends in a time-sharing manner; and each analog front-end circuit is connected to one second touch signal end, and each analog front-end circuit is configured to receive a second touch-control detection signal from one second touch-control signal end.

Description

Touch driving circuit and driving method thereof, and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a touch driving circuit and a driving method thereof, and a display device. Background Art

[0002] With the development of display technology, the price of display panels continues to decline. To improve product competitiveness, reducing the cost of display panels is one of the development directions of this field. As a key component of touch display panels, touch IC (Integrated Circuit) is also an important target for cost reduction.

[0003] Summary of the Invention

[0004] In one aspect, a touch driver circuit is provided. The touch driver circuit includes: multiple first touch signal terminals, multiple second touch signal terminals, and multiple analog front-end circuits. The number of first touch signal terminals is greater than the number of second touch signal terminals, and the number of analog front-end circuits is equal to the number of second touch signal terminals. One analog front-end circuit is connected to one second touch signal terminal. Each of the at least one analog front-end circuits is connected to at least two first touch signal terminals.

[0005] In some embodiments, each analog front-end circuit is connected to two first touch signal terminals and one second touch signal terminal.

[0006] In some embodiments, the touch driving circuit further includes: a plurality of first output circuits and a plurality of second output circuits. Each first output circuit is connected to a first touch signal terminal and configured to output a first driving signal to the corresponding first touch signal terminal. Each second output circuit is connected to a second touch signal terminal and configured to output a second driving signal to the corresponding second touch signal terminal.

[0007] In some embodiments, the number of the first output circuits is greater than the number of the second output circuits, and the number of the second output circuits is equal to the number of the analog front-end circuits.

[0008] In some embodiments, the first touch signal terminal is a touch transmitting signal terminal, and the second touch signal terminal is a touch sensing signal terminal.

[0009] In some embodiments, the first touch signal terminal is a touch sensing signal terminal, and the second touch signal terminal is a touch transmitting signal terminal.

[0010] In some embodiments, in the first output circuit and the second output circuit, the output circuit connected to the touch transmission signal terminal includes: a first switch and a second switch. The first end of the first switch is connected to the first voltage signal terminal, and the second end of the first switch is connected to the corresponding touch transmission signal terminal. The first end of the second switch is connected to the second voltage signal terminal, and the second end of the second switch is connected to the corresponding touch transmission signal terminal.

[0011] In some embodiments, the output circuit connected to the touch transmission signal terminal in the first output circuit and the second output circuit further includes a third switch, wherein a first terminal of the third switch is connected to the third voltage signal terminal, and a second terminal of the third switch is connected to the corresponding touch transmission signal terminal.

[0012] One of the second voltage signal provided by the second voltage signal terminal and the third voltage signal provided by the third voltage signal terminal has a voltage value greater than the voltage value of the first voltage signal provided by the first voltage signal terminal, and the other has a voltage value less than the voltage value of the first voltage signal.

[0013] In some embodiments, in the first output circuit and the second output circuit, the output circuit connected to the touch sensing signal terminal includes: a fourth switch and a fifth switch. A first terminal of the fourth switch is connected to the first voltage signal terminal, and a second terminal of the fourth switch is connected to the corresponding touch sensing signal terminal. A first terminal of the fifth switch is connected to the second voltage signal terminal, and a second terminal of the fifth switch is connected to the corresponding touch sensing signal terminal.

[0014] In some embodiments, the touch driving circuit further includes: a plurality of first control switches and a plurality of second control switches. An analog front-end circuit connected to at least two first touch signal terminals is connected to the at least two first touch signal terminals via the at least two first control switches, respectively. The at least two first control switches connected to the same analog front-end circuit are configured to be turned on in a time-sharing manner to transmit the first touch detection signals from the at least two first touch signal terminals to the analog front-end circuit in a time-sharing manner. Each analog front-end circuit is connected to a second touch signal terminal via a second control switch.

[0015] In some embodiments, the touch driving circuit further includes: a plurality of first electrostatic protection units and a plurality of second electrostatic protection units. Each first electrostatic protection unit is connected between a first touch signal terminal and a first control switch, and each second electrostatic protection unit is connected between a second touch signal terminal and a second control switch.

[0016] In another aspect, another touch driving circuit is provided. The touch driving circuit includes: a plurality of first touch signal terminals, a plurality of second touch signal terminals, and a plurality of analog front-end circuits. The number of analog front-end circuits is less than the number of first touch signal terminals, and less than the number of second touch signal terminals. Each of the at least one analog front-end circuit is connected to at least two first touch signal terminals. Each of the at least one analog front-end circuit is connected to at least two second touch signal terminals.

[0017] In some embodiments, the number of first touch signal terminals is equal to the number of second touch signal terminals, and each analog front-end circuit is connected to at least two first touch signal terminals and at least two second touch signal terminals.

[0018] In another aspect, a display device is provided. The display device includes: a display panel and a touch driving circuit connected to the display panel. The touch driving circuit is the touch driving circuit provided in any of the above embodiments. The display panel includes: a plurality of first touch channels arranged in parallel and spaced apart along a first direction, and a plurality of second touch channels arranged in parallel and spaced apart along a second direction, wherein the first direction intersects the second direction. Each first touch channel extends along the second direction and is connected to a first touch signal terminal of the touch driving circuit. Each second touch channel extends along the first direction and is connected to a second touch signal terminal of the touch driving circuit.

[0019] In another aspect, a method for driving a touch driver circuit is provided. This method can be applied to the touch driver circuits provided in some of the aforementioned embodiments. The first touch signal terminal in the touch driver circuit is a touch transmission signal terminal, and the second touch signal terminal is a touch sensing signal terminal. This method includes a self-capacitance detection phase, which includes the following driving process.

[0020] The first output circuit applies a first drive signal to the first touch signal terminal; at least two first touch signal terminals connected to the same analog front-end circuit transmit a first touch detection signal to the corresponding analog front-end circuit in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

[0021] The second output circuit applies a second driving signal to the second touch signal terminal; the second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

[0022] In some embodiments, the driving method further includes a mutual capacitance detection stage, and the mutual capacitance detection stage includes the following driving process.

[0023] The first output circuit applies a first driving signal to the first touch signal terminal; the second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

[0024] In yet another aspect, another method for driving a touch driver circuit is provided. This method can be applied to the touch driver circuits provided in some of the aforementioned embodiments, wherein the first touch signal terminal in the touch driver circuit is a touch sensing signal terminal, and the second touch signal terminal is a touch transmitting signal terminal. This method includes a mutual capacitance detection phase, which includes the following driving process.

[0025] The second output circuit applies a second drive signal to the second touch signal terminal; at least two first touch signal terminals connected to the same analog front-end circuit transmit the first touch detection signal to their respective connected analog front-end circuits in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

[0026] In some embodiments, the driving method further includes a self-capacitance detection stage, and the self-capacitance detection stage includes the following driving process.

[0027] The first output circuit applies a first drive signal to the first touch signal terminal; at least two first touch signal terminals connected to the same analog front-end circuit transmit a first touch detection signal to their respective connected analog front-end circuits in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

[0028] The second output circuit applies a second driving signal to the second touch signal terminal; the second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

[0029] In another aspect, a method for driving a touch driver circuit is provided. This method can be applied to the touch driver circuits provided in some of the aforementioned embodiments, wherein the first touch signal terminal in the touch driver circuit is a touch transmission signal terminal, and the second touch signal terminal is a touch sensing signal terminal. The method includes a mutual capacitance detection phase, which includes the following driving process.

[0030] The first output circuit applies a first drive signal to the first touch signal end; at least two second touch signal ends connected to the same analog front-end circuit transmit second touch detection signals to their respective connected analog front-end circuits in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

[0031] In some embodiments, the driving method further includes a self-capacitance detection stage, and the self-capacitance detection stage includes the following driving process.

[0032] The first output circuit applies a first drive signal to the first touch signal terminal; at least two first touch signal terminals connected to the same analog front-end circuit transmit a first touch detection signal to the corresponding analog front-end circuit in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

[0033] The second output circuit applies a second drive signal to the second touch signal terminal; at least two second touch signal terminals connected to the same analog front-end circuit transmit a second touch detection signal to the corresponding analog front-end circuit in a time-sharing manner based on the capacitance change of the touch structure in the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0035] FIG1 is a planar structural diagram of a display device according to some embodiments;

[0036] FIG2 is an enlarged structural diagram of area E in FIG1 ;

[0037] FIG3 is an equivalent circuit diagram of a touch driving circuit according to some embodiments;

[0038] FIG4 is a structural block diagram of a touch driving circuit according to some embodiments;

[0039] FIG5 is an equivalent circuit diagram of a touch driving circuit according to some other embodiments;

[0040] FIG6 is an equivalent circuit diagram of a touch driving circuit according to yet other embodiments;

[0041] FIG7 is an equivalent circuit diagram of a touch driving circuit according to some further embodiments;

[0042] FIG8 is an equivalent circuit diagram of a touch driving circuit according to some embodiments;

[0043] FIG9 is an equivalent circuit diagram of a touch driving circuit according to some other embodiments;

[0044] FIG10 is a planar structural diagram of a display device according to some embodiments;

[0045] FIG11 is a driving timing diagram of a touch driving circuit according to some embodiments;

[0046] FIG12 is a timing diagram of a first touch signal terminal of a touch driving circuit according to some embodiments;

[0047] FIG13 is a timing diagram of a first touch signal terminal of a touch driving circuit according to some other embodiments;

[0048] FIG14 is a timing diagram of a touch driving circuit according to some embodiments;

[0049] FIG15 is an equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0050] FIG16 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0051] FIG17 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0052] FIG18 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0053] FIG19 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0054] FIG20 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0055] FIG21 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0056] FIG22 is an equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0057] FIG23 is another equivalent circuit diagram of a touch driving circuit in a mutual capacitance detection stage according to some embodiments;

[0058] FIG24 is an equivalent circuit diagram of a touch driving circuit in a self-capacitance detection stage according to some embodiments;

[0059] FIG25 is another equivalent circuit diagram of a touch driving circuit in a self-capacitance detection stage according to some embodiments;

[0060] FIG26 is a planar structural diagram of a display device according to some embodiments;

[0061] FIG27 is a driving timing diagram of a touch driving circuit according to some embodiments;

[0062] FIG28 is a timing diagram of a first touch signal terminal of a touch driving circuit according to some embodiments;

[0063] FIG29 is a timing diagram of a first touch signal terminal of a touch driving circuit according to some other embodiments;

[0064] FIG30 is an equivalent circuit diagram of a touch driving circuit according to some embodiments;

[0065] FIG31 is a timing diagram of a touch driving circuit according to some embodiments;

[0066] FIG32 is an equivalent circuit diagram of a touch driving circuit according to some embodiments;

[0067] FIG33 is a driving timing diagram of a touch driving circuit according to some embodiments;

[0068] FIG34 is an equivalent circuit diagram of a touch driving circuit according to some embodiments;

[0069] FIG35 is a planar structural diagram of a display device according to some embodiments;

[0070] FIG36 is a planar structural diagram of a display device according to some other embodiments;

[0071] FIG37 is an enlarged structural diagram of a first binding area B1 of a display device according to some embodiments;

[0072] FIG38 is an enlarged structural diagram of a first binding area B1 of a display device according to some other embodiments;

[0073] FIG39 is an enlarged structural diagram of area M in FIG37 or FIG38;

[0074] FIG40 is an enlarged structural diagram of area N in FIG37 or FIG38;

[0075] FIG41 is another enlarged structural diagram of the area M in FIG37 or FIG38;

[0076] FIG42 is another enlarged structural diagram of area N in FIG37 or FIG38;

[0077] FIG43 is an enlarged structural diagram of a second binding area B2(A) of a display device according to some embodiments;

[0078] FIG44 is an enlarged structural diagram of a second binding area B2(B) of a display device according to some embodiments;

[0079] FIG45 is a planar structural diagram of a display device according to some embodiments;

[0080] FIG46 is an enlarged structural diagram of area M in FIG37 or FIG38;

[0081] FIG47 is an enlarged structural diagram of area N in FIG37 or FIG38. DETAILED DESCRIPTION

[0082] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0083] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0084] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0085] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0086] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0087] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0088] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [stated condition or event] is detected" are optionally interpreted to mean "upon determining" or "in response to determining" or "upon detecting [stated condition or event]" or "in response to detecting [stated condition or event]," depending on the context.

[0089] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0090] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0091] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0092] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0093] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0094] Embodiments of the present disclosure provide a display device 100. As shown in FIG1 , the display device 100 includes a display panel 10 and a touch driving circuit 20 connected to the display panel 10. The display panel 10 includes a touch structure 11 connected to the touch driving circuit 20. The touch structure 11 is connected to the touch driving circuit 20 to obtain a touch driving signal, thereby realizing the touch function of the display panel 10.

[0095] Exemplarily, the display device 100 includes, but is not limited to, mobile phones, wearable devices (e.g., portable computer watches), PDAs (Personal Digital Assistants), navigators, handheld or portable computers (e.g., tablet computers, laptop computers, etc.), GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, flat-panel displays, computer monitors, car displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles, etc.), and any other products or components with display functions.

[0096] In some embodiments, as shown in FIG1 , a display device 100 includes a display panel 10. The display device 100 is, for example, a touch display device. The display panel 10 can be a display panel that only implements a display function, where the display panel is used to display images to implement the display function, while a separate touch panel is provided in the display device 100 to implement touch operations to implement the touch function. Alternatively, the display panel can be a touch display panel, where a single display panel can implement both the touch function and the display function.

[0097] Taking the display panel 10 as a touch display panel as an example, the display panel 10 needs to be connected to an external driving structure (such as a display driving chip and a touch driving chip, etc.) to obtain driving signals (such as display driving signals and touch driving signals, etc.), thereby realizing the display function and touch function of the display panel 10.

[0098] In some embodiments, the display device 100 further includes a display driver circuit and a touch driver circuit 20. The display driver circuit is connected to the display panel 10 and is configured to drive the display panel 10 to implement a display function; the touch driver circuit 20 is connected to the display panel 10 and is configured to drive the display panel 10 to implement a touch function.

[0099] Based on this, as shown in Figure 1, the display driver circuit and the touch driver circuit can be set on the same chip structure, that is, the display panel 10 is connected to the touch and display driver integrated circuit chip (Touch and Display Driver Integration Integrated Chip, referred to as TDDI IC), and the display device 100 can realize the display function and touch function under the control of a single chip. Alternatively, the display driver circuit and the touch driver circuit can also be set on different chip structures, that is, the display panel 10 is connected to the display integrated circuit chip (Display Integrated Circuit Chip, referred to as DIC) and the touch integrated circuit chip (Touch Integrated Circuit Chip, referred to as TIC), respectively, and the display device 100 is controlled by two chips to realize the display function and touch function.

[0100] In some embodiments, as shown in FIG1 , the touch structure 11 includes a plurality of first touch channels 111 arranged in parallel and spaced relation along a first direction X, and a plurality of second touch channels 112 arranged in parallel and spaced relation along a second direction Y, where the first direction X intersects the second direction Y. Each first touch channel 111 extends along the second direction Y, and is connected to a first touch signal terminal S1 (see FIG3 ) of the touch driver circuit 20. Each second touch channel 112 extends along the first direction X, and is connected to a second touch signal terminal S2 (see FIG3 ) of the touch driver circuit 20.

[0101] In some embodiments, as shown in FIG1 , the display device 100 has a display area AA (Active Area), and the touch structure 11 includes a plurality of touch electrodes D disposed in the display area AA. The plurality of touch electrodes D include a plurality of first touch electrodes 11 a and a plurality of second touch electrodes 11 c. The first touch electrodes 11 a and the second touch electrodes 11 c are electrically insulated.

[0102] In order to clearly describe the details of the touch structure 11, the enlarged structure diagram of area E shown in Figure 2 only shows the touch structure 11. It can be understood that area E of the display panel 10 can also include other structures besides the structure shown in the figure.

[0103] Exemplarily, as shown in Figures 1 and 2, multiple first touch electrodes 11a are arranged at intervals along the first direction X, and any two adjacent first touch electrodes 11a are connected, for example, by a first connecting portion 11b. The multiple first touch electrodes 11a and the multiple first connecting portions 11b alternately arranged along the first direction X form a first touch channel 111.

[0104] Exemplarily, as shown in Figures 1 and 2, multiple second touch electrodes 11c are arranged at intervals along the second direction Y, and any two adjacent second touch electrodes 11c are connected, for example, by a second connecting portion 11d. The multiple second touch electrodes 11c and the multiple second connecting portions 11d alternately arranged along the second direction Y form a second touch channel 112.

[0105] In some embodiments, as shown in FIG1 , the display panel 10 further includes a plurality of touch leads CK, each first touch channel 111 is connected to a first touch signal terminal S1 in the touch driving circuit 20 through a first touch lead CK (for example, the first touch lead 2 shown in FIG1 ), and each second touch channel 112 is connected to a second touch signal terminal S2 in the touch driving circuit 20 through a touch lead CK (for example, the second touch lead 4 shown in FIG1 ).

[0106] In some embodiments, the touch structure 11 can realize the touch function by mutual capacitance driving. The first touch signal terminal S1 is, for example, a touch transmission signal terminal, and correspondingly, the second touch signal terminal S2 is a touch sensing signal terminal.

[0107] Based on this, in the touch detection stage Tc, the first touch signal terminal S1 in the touch driving circuit 20 applies a first driving signal to the corresponding first touch channel 111, and a basic capacitance is generated between the touch electrodes D in the display panel 10 (for example, the adjacent first touch electrodes 11a and the second touch electrodes 11c).

[0108] When no touch action occurs, only basic capacitance exists in the touch structure 11. However, when a touch action occurs, when a finger touches the display panel 10, the mutual capacitance between the touch electrodes D at the touch position changes, and the second touch channel 112 transmits a sensing signal to the second touch signal terminal S2. The touch driving circuit 20 identifies the touch position of the finger based on the sensing signal, thereby realizing the touch function of the display panel 10.

[0109] In some embodiments, the touch driving circuit includes a plurality of first touch signal terminals S1 , a plurality of second touch signal terminals S2 , and a plurality of analog front end circuits (AFEs).

[0110] Exemplarily, in the touch driving circuit, when the number of first touch signal terminals S1 is greater than the number of second touch signal terminals S2, the number of analog front-end circuits AFE is the same as the number of first touch signal terminals S1. In the touch driving circuit, each analog front-end circuit AFE is connected to one first touch signal terminal S1; further, in the touch driving circuit, each analog front-end circuit AFE in a portion of the analog front-end circuits AFE is connected to one second touch signal terminal S2, while another portion of the analog front-end circuits AFE are not connected to any second touch signal terminal S2.

[0111] For example, a touch driving circuit includes 76 first touch signal terminals S1, 51 second touch signal terminals S2, and 76 analog front-end circuits (AFEs). Each of the 51 AFEs is connected to one first touch signal terminal S1 and one second touch signal terminal S2, while each of the other 25 AFEs is connected to one first touch signal terminal S1 and not to the second touch signal terminal S2.

[0112] For example, in the touch driving circuit, when the number of first touch signal terminals S1 is the same as the number of second touch signal terminals S2, the number of analog front-end circuits AFE is also the same as the number of first touch signal terminals S1. In the touch driving circuit, one analog front-end circuit AFE is connected to one first touch signal terminal S1 and to one second touch signal terminal S2.

[0113] For example, if the touch driving circuit includes 40 first touch signal terminals S1 and 40 second touch signal terminals S2, then the touch driving circuit also includes 40 analog front-end circuits AFE, where each analog front-end circuit AFE is connected to one first touch signal terminal S1 and one second touch signal terminal S2.

[0114] In some application scenarios, the touch driver circuit may be packaged on a substrate to form a touch driver chip, which is connected to the display panel 10. Therefore, the greater the number of first touch channels 111 and second touch channels 112 in the display panel 10, the greater the number of first touch signal terminals S1 and second touch signal terminals S2 in the touch driver circuit, and accordingly, the greater the number of analog front-end circuits AFE.

[0115] Since the area ratio of the analog front-end circuit AFE (the ratio of the area of ​​the analog front-end circuit AFE to the area of ​​the touch driver circuit) is large, the overall size of the touch driver circuit will also be larger. Correspondingly, the size of the touch chip will be larger, and the increase in the number of analog front-end circuits AFE will also increase the cost of the touch driver circuit.

[0116] Based on this, embodiments of the present disclosure provide a touch driver circuit 20b. As shown in Figure 3, the touch driver circuit 20b includes: a plurality of first touch signal terminals S1, a plurality of second touch signal terminals S2, and a plurality of analog front-end circuits (AFEs). The number of first touch signal terminals S1 is greater than the number of second touch signal terminals S2, and the number of analog front-end circuits (AFEs) is equal to the number of second touch signal terminals S2.

[0117] For example, the first touch signal terminal S1 can be a touch transmission signal terminal, and the second touch signal terminal can be a touch sensing signal terminal. Based on this, in the touch structure 11, the first touch electrode 11a is the touch drive electrode Tx, and the second touch electrode 11c is the touch sensing electrode Rx. During the mutual capacitance detection phase, the first touch signal terminal S1 sends a touch drive signal to the first touch channel 111 of the touch structure 11. The second touch channel 112 transmits a touch sensing signal to the second touch signal terminal S2 based on the capacitance change in the touch structure 11 to detect the touch position.

[0118] Alternatively, the first touch signal terminal S1 can be a touch sensing signal terminal, and the second touch signal terminal can be a touch transmitting signal terminal. Based on this, in the touch structure 11, the first touch electrode 11a is the touch sensing electrode Rx, and the second touch electrode 11c is the touch driving electrode Tx. During the mutual capacitance detection phase, the second touch signal terminal S2 sends a touch driving signal to the second touch channel 112 of the touch structure 11. The first touch channel 111 transmits a touch sensing signal to the first touch signal terminal S1 based on the capacitance change in the touch structure 11 to detect the touch position.

[0119] In some embodiments, each of the at least one analog front-end circuit (AFE) in the touch driving circuit 20b is connected to at least two first touch signal terminals S1. For example, during the touch driving process, self-capacitance detection can be performed using the first touch channel 111 of the touch structure 11. During this self-capacitance detection phase, after applying a first driving signal to the first touch channel 111 in the display panel 10 via the first touch signal terminal S1, the first touch channel 111 transmits a first touch detection signal to the corresponding first touch signal terminal S1 based on the capacitance change in the touch structure 11. The first touch signal terminal S1 then transmits the received first touch detection signal to the corresponding analog front-end circuit AFE.

[0120] In a case where an analog front-end circuit AFE is connected to a first touch signal terminal S1 , the first touch signal terminal S1 sends the first touch detection signal to the analog front-end circuit AFE.

[0121] When an analog front-end circuit AFE is connected to multiple (two or more) first touch signal terminals S1, the multiple first touch signal terminals S1 are connected to the analog front-end circuit AFE in a time-sharing manner, and the analog front-end circuit AFE receives the first touch detection signals from each first touch signal terminal S1 connected thereto in a time-sharing manner.

[0122] In the touch drive circuit 20b, an analog front-end circuit (AFE) is connected to a second touch signal terminal (S2). In some embodiments, self-capacitance detection can be performed using the second touch channel 112 of the touch structure 11. During this self-capacitance detection phase, after applying a second drive signal to the second touch channel 112 in the display panel 10 via the second touch signal terminal (S2), the second touch channel 112 transmits a second touch detection signal to the corresponding second touch signal terminal (S2) based on the capacitance change in the touch structure 11. The analog front-end circuit (AFE) receives the second touch detection signal from the second touch signal terminal (S2).

[0123] In some embodiments, the touch driving circuit 20b includes m first touch signal terminals S1 and n second touch signal terminals S2, where m and n are positive integers, and m>n≥1. Some embodiments of the present disclosure are described below using m≤2n as an example.

[0124] The touch driving circuit 20b may include n analog front-end circuits (AFEs), each of which is connected to a second touch signal terminal S2; each of the (2n-m) analog front-end circuits (AFEs) is connected to a first touch signal terminal S1; and each of the remaining (mn) analog front-end circuits (AFEs) is connected to two first touch signal terminals S1.

[0125] For example, as shown in FIG3 , the touch driving circuit 20 b includes 40 first touch signal terminals S1 and 20 second touch signal terminals S2. Therefore, the touch driving circuit 20 b also includes 20 analog front-end circuits AFE, each of which is connected to one second touch signal terminal S2 and two first touch signal terminals S1.

[0126] For another example, if the touch driving circuit 20b includes 76 first touch signal terminals S1 and 51 second touch signal terminals S2, then the touch driving circuit 20b may include 51 analog front-end circuits (AFEs), each of which is connected to one second touch signal terminal S2; each of the 26 analog front-end circuits (AFEs) is connected to one first touch signal terminal S1, and each of the remaining 25 analog front-end circuits (AFEs) is connected to two first touch signal terminals S1.

[0127] By adopting the technical solution provided in the above embodiment, when the number of the first touch signal terminals S1 and the number of the second touch signal terminals S2 in the touch driving circuit 20b are different, the number of the analog front-end circuits AFE is the same as the smaller number of the first touch signal terminals S1 and the second touch signal terminals S2.

[0128] When the number of first touch signal terminals S1 is greater than the number of second touch signal terminals S2, each analog front-end circuit AFE in the touch driving circuit 20b can be connected to multiple (two or more) first touch signal terminals S1, or, each analog front-end circuit AFE in a part of the analog front-end circuits AFE in the touch driving circuit 20b is connected to one first touch signal terminal S1, and each analog front-end circuit AFE in another part of the analog front-end circuits AFE is connected to multiple first touch signal terminals S1.

[0129] In this way, in the touch driving circuit 20b, at least part of the analog front-end circuits AFE are multiplexed among the multiple analog front-end circuits AFE, thereby reducing the number of analog front-end circuits AFE in the touch driving circuit 20b while keeping the number of the first touch signal terminal S1 and the second touch signal terminal S2 unchanged, thereby reducing the size of the touch driving circuit 20b and reducing the size and cost of the touch chip.

[0130] It should be noted that, in the touch driving circuit 20 b , one analog front-end circuit AFE may also be connected to three or more first touch signal terminals S1 , and the specific design may be adaptively performed as needed.

[0131] In some embodiments, as shown in FIG4 , the touch driving circuit 20 (e.g., the touch driving circuit 20 b, the touch driving circuit 20 c, and the touch driving circuit 20 d) includes an analog circuit module 21 and a digital circuit module 22, which are connected to each other. The analog circuit module 21 includes an analog front-end circuit (AFE), which is configured to amplify and perform noise reduction processing on received analog signals (e.g., the first touch detection signal and the second touch detection signal).

[0132] The analog circuit module 21 further includes an analog-to-digital conversion circuit 205 , which is connected to the analog front-end circuit AFE and the digital circuit module 22 . The analog front-end circuit AFE is further configured to send the processed analog signal to the analog-to-digital conversion circuit 205 .

[0133] For example, as shown in Figures 3 and 4 , the analog front-end circuit (AFE) receives a sensing signal (a first touch detection signal or a second touch detection signal) transmitted from the corresponding touch signal terminal (the first touch signal terminal S1 or the second touch signal terminal S2) and amplifies and performs noise reduction processing on the sensing signal. The analog front-end circuit (AFE) then sends the processed sensing signal to the analog-to-digital conversion circuit 205. The analog-to-digital conversion circuit 205 can be an ADC (Analog-to-Digital Converter).

[0134] Exemplarily, the digital circuit module 22 includes an MCU (Microcontroller Unit), and the analog-to-digital conversion circuit 205 is also connected to the MCU. The analog-to-digital conversion circuit 205 converts the sensing signal from an analog signal to a digital signal and transmits it to the MCU. The MCU analyzes the digital signal to determine the touch position on the display panel 10.

[0135] In some embodiments, as shown in FIG3 , each analog front-end circuit (AFE) is connected to two first touch signal terminals S1 and one second touch signal terminal S2. Each analog front-end circuit (AFE) is configured to receive first touch detection signals from the two corresponding first touch signal terminals S1 in a time-sharing manner. Each analog front-end circuit (AFE) is also configured to receive second touch detection signals from the corresponding second touch signal terminal S2.

[0136] For example, as shown in FIG3 , the touch driving circuit 20 b includes m first touch signal terminals S1 and n second touch signal terminals S2 , where m=2n. Therefore, the touch driving circuit 20 b may include n analog front-end circuits AFE. Each analog front-end circuit AFE is connected to one second touch signal terminal S2 and to two first touch signal terminals S1 .

[0137] For example, if the touch driving circuit 20b includes 40 first touch signal terminals S1 and 20 second touch signal terminals S2, then the touch driving circuit 20b also includes 20 analog front-end circuits AFE. Each analog front-end circuit AFE is connected to one second touch signal terminal S2 and to two first touch signal terminals S1.

[0138] In this case, the number of first touch signal terminals S1 is twice the number of second touch signal terminals S2. Accordingly, the number of analog front-ends AFE is the same as the number of second touch signal terminals S2, and the number of first touch signal terminals S1 is also twice the number of analog front-end circuits AFE.

[0139] The touch driver circuit 20b provided in this embodiment can effectively reduce the number of analog front-end circuits (AFEs) compared to the touch driver circuits provided in some of the aforementioned embodiments. For example, if the number of first touch signal terminals S1 is twice the number of second touch signal terminals S2, the touch driver circuit 20b provided in this embodiment can reduce the number of analog front-end circuits (AFEs) by half compared to the touch driver circuits provided in some of the aforementioned embodiments. While ensuring that the touch driver circuit 20b can properly implement drive control, the touch driver circuit 20b has a lower cost and, when used in a touch driver chip, can result in a smaller touch driver chip.

[0140] It should be noted that, in the touch driving circuit 20 b , one analog front-end circuit AFE may also be connected to three or more first touch signal terminals S1 , and the specific design may be adaptively performed as needed.

[0141] Some embodiments of the present disclosure are described below by taking an example in which the touch driving circuit 20 b includes 40 first touch signal terminals S1 , 20 second touch signal terminals S2 , and 20 analog front-end circuits AFE.

[0142] As shown in FIG3 , in order to facilitate the description of the specific structure of the touch driving circuit 20 b and the connection relationship between its various parts, the 40 first touch signal terminals S1 are numbered sequentially as the first touch signal terminal S1(1), the first touch signal terminal S1(2), …, the first touch signal terminal S1(40); the 20 second touch signal terminals S2 are numbered sequentially as the second touch signal terminal S2(1), the second touch signal terminal S2(2), …, the second touch signal terminal S2(20); and the 20 analog front-end circuits AFE are numbered sequentially as the analog front-end circuit AFE(1), the analog front-end circuit AFE(2), …, the analog front-end circuit AFE(20).

[0143] Two first touch signal terminals S1 with adjacent numbers are connected to the same analog front-end circuit AFE, for example: the first touch signal terminal S1(1) and the first touch signal terminal S1(2) are connected to the analog front-end circuit AFE(1), the first touch signal terminal S1(3) and the first touch signal terminal S1(4) are connected to the analog front-end circuit AFE(2), ..., the first touch signal terminal S1(39) and the first touch signal terminal S1(40) are connected to the analog front-end circuit AFE(20).

[0144] The second touch signal terminal S2 with the same number is connected to the analog front-end circuit AFE. The second touch signal terminal S2(1) is connected to the analog front-end circuit AFE(1), the second touch signal terminal S2(2) is connected to the analog front-end circuit AFE(2), ..., the second touch signal terminal S2(20) is connected to the analog front-end circuit AFE(20).

[0145] In some embodiments, as shown in FIG5 , the touch driving circuit 20 b further includes a plurality of first control switches G1 . An analog front-end circuit (AFE) connected to the at least two first touch signal terminals S1 is connected to the at least two first touch signal terminals S1 via the at least two first control switches G1 . The at least two first control switches G1 are configured to be turned on in a time-sharing manner to transmit the first touch detection signals from the at least two first touch signal terminals S1 to the analog front-end circuit AFE in a time-sharing manner.

[0146] Exemplarily, as shown in FIG5 , an analog front-end circuit AFE is connected to two first touch signal terminals S1 , and each of the two first touch signal terminals S1 is connected to the same analog front-end circuit AFE through a first control switch G1 .

[0147] By setting the first control switch G1, the on-off connection between the first touch signal terminal S1 and the corresponding analog front-end circuit AFE can be controlled, so that the first touch signal terminal S1 and the corresponding analog front-end circuit AFE can be controlled to be disconnected at other times, and only be connected when sensing signal transmission is required, thereby avoiding signal mistransmission.

[0148] When an analog front-end circuit AFE is connected to multiple (two or more) first touch signal terminals S1, when multiple terminals connected to the same analog front-end circuit AFE need to transmit the first touch detection signal to the corresponding analog front-end circuit AFE, by controlling the multiple first control switches G1 connected to the same analog front-end circuit AFE to be closed in time-sharing mode, the multiple first touch signal terminals S1 can be used to transmit the first touch detection signal to the same analog front-end circuit AFE in time-sharing mode.

[0149] Compared to the touch driver circuits provided in some of the aforementioned embodiments, the touch driver circuit 20b of this embodiment features a single analog front-end circuit (AFE) that can be connected to two or more first touch signal terminals S1, thus achieving time-division multiplexing of the analog front-end circuit (AFE). Thus, even if the number of first touch signal terminals S1 and second touch signal terminals S2 is the same, the touch driver circuit 20b provided in this embodiment has fewer analog front-end circuits (AFEs), which helps reduce the size of the touch driver circuit 20b and, in turn, the size of the touch driver chip.

[0150] Furthermore, by providing the first control switch G1 to control the time-sharing conduction between the plurality of first touch signal terminals S1 and the same analog front-end circuit AFE, the circuit structure is simple, which is conducive to reducing the area of ​​the touch chip.

[0151] In some embodiments, as shown in FIG5 , the touch driving circuit 20 b further includes: a plurality of second control switches G2 . Each analog front-end circuit AFE is connected to a second touch signal terminal S2 via a second control switch G2 .

[0152] By setting a plurality of second control switches G2, the on-off state between the second touch signal terminal S2 and the corresponding analog front-end circuit AFE can be controlled, so that the second touch signal terminal S2 and the corresponding analog front-end circuit AFE can be controlled to be disconnected at other times, and only be connected when sensing signal transmission is required, thereby avoiding signal mistransmission.

[0153] Furthermore, by providing the second control switch G2 to control the connection and disconnection between the second touch signal terminal S2 and the analog front-end circuit AFE, the circuit structure is simple, which is conducive to achieving the effect of reducing the area of ​​the touch chip.

[0154] In some embodiments, as shown in Figures 5, 6, and 7, the touch driving circuit 20b further includes: a plurality of first ESD protection units 203 and a plurality of second ESD protection units 204. Each first ESD protection unit 203 is disposed between a first touch signal terminal S1 and a corresponding analog front-end circuit AFE, and each second ESD protection unit 204 is disposed between a second touch signal terminal S2 and a corresponding analog front-end circuit AFE.

[0155] For example, as shown in FIG5 , each first electrostatic protection unit 203 is connected between a second control switch G1 and the corresponding first touch signal terminal S1 , and each second electrostatic protection unit 204 is connected between a second control switch G2 and the corresponding analog front-end circuit AFE.

[0156] Alternatively, each first ESD protection unit 203 is connected between a first control switch G1 and the corresponding analog front-end circuit AFE, and each second ESD protection unit 204 is connected between a second control switch G2 and the corresponding second touch signal terminal S2.

[0157] 6 , each first electrostatic protection unit 203 is connected between a first touch signal terminal S1 and a first control switch G1 , and each second electrostatic protection unit 204 is connected between a second touch signal terminal S2 and a second control switch G2 .

[0158] For another example, each first ESD protection unit 203 is connected between a second control switch G1 and the corresponding first touch signal terminal S1 , and each second ESD protection unit 204 is connected between a second control switch G2 and the corresponding second touch signal terminal S2 .

[0159] The connection between the first ESD protection unit 203 and the corresponding first control switch G1 and the analog front-end circuit AFE, and the connection between the second ESD protection unit 204 and the corresponding second control switch G2 and the analog front-end circuit AFE are not limited to the above examples.

[0160] For example, the first and second ESD protection units 203 and 204 may include at least one of a resistor and a diode. Of course, the first and second ESD protection units 203 and 204 may also include other electronic components or employ other circuit structures capable of achieving an anti-static effect. This is merely an illustrative example of some possible implementations and does not limit the present disclosure.

[0161] When the first ESD protection unit 203 includes a resistor, the first ESD protection unit 203 is configured to reduce the current between the first touch signal terminal S1 and the corresponding analog front-end circuit AFE. When the second ESD protection unit 204 includes a resistor, the second ESD protection unit 204 is configured to reduce the current between the second touch signal terminal S2 and the corresponding analog front-end circuit AFE.

[0162] When the first control switch G1 or the second control switch G2 is closed, the first touch signal terminal S1 or the second touch signal terminal S2 is connected to the analog front-end circuit AFE. If static electricity exists in the touch driving circuit 20b, when the first control switch G1 or the second control switch G2 is closed, an instantaneous excessive current may occur in the circuit, and the large current may be transmitted to the analog front-end circuit AFE or the display panel 10, causing damage.

[0163] By setting up an electrostatic protection unit (a first electrostatic protection unit 203 and a second electrostatic protection unit 204), the magnitude of the current transmitted between the first touch signal terminal S1 or the second touch signal terminal S2 and the analog front-end circuit AFE when the first control switch G1 or the second control switch G2 is closed is reduced, thereby avoiding static electricity from being transmitted to the analog front-end circuit AFE or the display panel 10 through the first control switch G1 or the second control switch G2 when the first control switch G1 or the second control switch G2 is closed, thereby preventing damage to the touch drive circuit 20b or the display panel 10, thereby ensuring the safety of the circuit.

[0164] When the first ESD protection unit 203 includes a diode, the first ESD protection unit 203 is configured to unidirectionally conduct electricity between the first touch signal terminal S1 and the corresponding analog front-end circuit AFE, so that the electrical signal (e.g., the first touch detection signal) can only be transmitted unidirectionally from the first touch signal terminal S1 to the corresponding analog front-end circuit AFE. When the second ESD protection unit 204 includes a diode, the second ESD protection unit 204 is configured to unidirectionally conduct electricity between the second touch signal terminal S2 and the corresponding analog front-end circuit AFE, so that the electrical signal (e.g., the second touch detection signal) can only be transmitted unidirectionally from the second touch signal terminal S2 to the corresponding analog front-end circuit AFE.

[0165] Without an electrostatic protection unit, if static electricity exists in the touch drive circuit 20b, when the first control switch G1 or the second control switch G2 is closed, the static electricity current may be transmitted through the first touch signal terminal S1 or the second touch signal terminal S2 to the touch structure 11 in the display panel 10, affecting the accuracy of touch detection. By providing an electrostatic protection unit, the unidirectional conductivity of the diode ensures that when the first control switch G1 or the second control switch G2 is closed, only the electrical signal (the first touch detection signal or the second touch detection signal) transmitted from the first touch signal terminal S1 or the second touch signal terminal S2 to the analog front-end circuit AFE exists in the circuit, thereby preventing static electricity from interfering with the touch detection signal and ensuring the accuracy of touch detection.

[0166] In some embodiments, as shown in FIG. 3 and FIG. 5 , the touch driving circuit 20 b further includes: a plurality of first output circuits 201 and a plurality of second output circuits 202 .

[0167] Each first output circuit 201 is connected to a first touch signal terminal S1. During the mutual capacitance detection phase, or when self-capacitance detection is performed through the first touch channel 111 in the touch structure 11, the first output circuit 201 outputs a first drive signal to the corresponding first touch signal terminal S1, thereby changing the drive voltage applied by the first touch signal terminal S1 to the corresponding first touch channel 111, thereby forming a basic capacitance in the touch structure 11.

[0168] Each second output circuit 202 is connected to a second touch signal terminal S2. During the mutual capacitance detection phase, or when self-capacitance detection is performed through the second touch channel 112 in the touch structure 11, the second output circuit 202 outputs a second drive signal to the corresponding second touch signal terminal S2, thereby changing the drive voltage applied by the second touch signal terminal S2 to the corresponding second touch channel 112, thereby forming a basic capacitance in the touch structure 11.

[0169] Exemplarily, each first output circuit 201 is further connected to the first voltage signal terminal V1 and the second voltage signal terminal V2 , and each second output circuit 202 is further connected to the first voltage signal terminal V1 and the second voltage signal terminal V2 .

[0170] The first output circuit 201 is configured to output the first voltage signal provided by the first voltage signal terminal V1, or the second voltage signal provided by the second voltage signal terminal V2, to the corresponding first touch signal terminal S1. During the mutual capacitance detection phase or the self-capacitance detection phase, the first output circuit 201 outputs the first voltage signal or the second voltage signal to the corresponding first touch signal terminal S1. Thus, the voltage from the first touch signal terminal S1 to the corresponding first touch channel 111 is the first voltage or the second voltage, thereby forming a basic capacitance in the touch structure 11 between the first touch channel 111 and the second touch channel 112, or between the first touch channel 111 and the ground.

[0171] The second output circuit 202 is configured to output the first voltage signal provided by the first voltage signal terminal V1, or the second voltage signal provided by the second voltage signal terminal V2, to the corresponding second touch signal terminal S2. During the mutual capacitance detection phase or the self-capacitance detection phase, the second output circuit 202 outputs the first voltage signal or the second voltage signal to the corresponding second touch signal terminal S2. Thus, the voltage from the second touch signal terminal S2 to the corresponding second touch channel 112 is the first voltage or the second voltage, thereby forming a basic capacitance in the touch structure 11 between the second touch channel 112 and the first touch channel 111, or between the second touch channel 112 and ground.

[0172] By setting the first output circuit 201 and the second output circuit 202, during the driving process of the touch driving circuit, a driving signal is sent to the first touch signal terminal S1 and the second touch signal terminal S2 according to the received control signal (the control signal can be a mutual capacitance driving instruction signal or a self-capacitance driving instruction signal), thereby adjusting the voltage value of the first touch signal terminal S1 and the second touch signal terminal S2, and then adjusting the basic capacitance value in the touch structure 11.

[0173] In some embodiments, as shown in FIG3 and FIG5 , the number of the first output circuits 201 is greater than the number of the second output circuits 202 , and the number of the second output circuits 202 is equal to the number of analog front-end circuits AFE.

[0174] Each first touch signal terminal S1 is connected to a first output circuit 201, and each second touch signal terminal S2 is connected to a second output circuit 202. When the number of first touch signal terminals S1 is greater than the number of second touch signal terminals S2, the number of first output circuits 201 is also greater than the number of second output circuits 202. Based on this, when the number of analog front-end circuits AFE in the touch driving circuit 20b is the same as the number of second touch signal terminals S2, the number of second output circuits 202 is equal to the number of analog front-end circuits AFE.

[0175] In some embodiments, as shown in Figures 6 and 7, in the first output circuit 201 and the second output circuit 202, the output circuit connected to the touch transmission signal terminal includes: a first switch K1 and a second switch K2. The first end of the first switch K1 is connected to the first voltage signal terminal V1, and the second end of the first switch K1 is connected to the corresponding touch transmission signal terminal; the first end of the second switch K2 is connected to the second voltage signal terminal V2, and the second end of the second switch K2 is connected to the corresponding touch transmission signal terminal.

[0176] For example, as shown in Figure 6, the first touch signal terminal S1 is a touch transmission signal terminal, connected to the first voltage signal terminal V1 via a first switch K1, and connected to the second voltage signal terminal V2 via a second switch K2. As shown in Figure 7, the second touch signal terminal S2 is a touch transmission signal terminal, the first touch signal terminal S1 is a touch sensing signal terminal, connected to the first voltage signal terminal V1 via a first switch K1, and connected to the second voltage signal terminal V2 via a second switch K2.

[0177] By providing the first switch K1 and the second switch K2, the on-off connection between the touch transmission signal terminal and the first voltage signal terminal V1 and the second voltage signal terminal V2 is independently controlled. While achieving voltage control of the touch transmission signal terminal, the circuit structure is simple, which is conducive to reducing the area of ​​the touch chip.

[0178] During the driving process of the touch driving circuit 20b, within a touch detection cycle, the first output circuit 201 transmits the first voltage signal provided by the first voltage signal terminal V1 or the second voltage signal provided by the second voltage signal terminal V2 to the first touch signal terminal S1. At this time, a basic capacitance is formed between adjacent first touch electrodes 11a and second touch electrodes 11c in the display panel 10. The same basic capacitance (mutual capacitance formed between the first touch electrodes 11a and the second touch electrodes 11c) is formed at each position in the touch structure 11. When a finger touches the display panel 10, the mutual capacitance value of the touch structure 11 at the finger touch position will change. Each second touch electrode 11c in the display panel 10 transmits a second touch detection signal to the corresponding analog front-end circuit AFE, thereby determining the touch position.

[0179] In a touch detection cycle, the first switch K1 and the second switch K2 are closed in time-sharing mode to transmit the first power signal or the second power signal to the touch transmission signal terminal in time-sharing mode, thereby changing the voltage of the touch transmission signal terminal and forming different basic capacitances in the touch structure 11 .

[0180] When the base capacitance values ​​of the touch structure 11 are different, the capacitance change of the touch structure 11 will vary with the base capacitance values ​​under the same touch operation. Thus, during a touch detection cycle, corresponding sensing signals can be detected based on the different base capacitance values, thereby improving the accuracy of touch position detection.

[0181] Exemplarily, the voltage value provided by the first voltage signal terminal V1 is different from the voltage value provided by the second voltage signal terminal V2. For example, the first voltage signal terminal V1 is the ground signal terminal GND, and the second voltage signal terminal V2 is the first power supply terminal Hvdd. The voltage provided by the first power supply terminal Hvdd is a high voltage that is greater than the ground voltage provided by the ground signal terminal GND.

[0182] In some embodiments, as shown in Figures 8 and 9 , the output circuits connected to the touch transmission signal terminals in the first output circuit 201 and the second output circuit 202 are also connected to the third voltage signal terminal V3. Therefore, the output circuits connected to the touch transmission signal terminals in the first output circuit 201 and the second output circuit 202 further include a third switch K3. A first terminal of the third switch K3 is connected to the third voltage signal terminal V3, and a second terminal of the third switch K3 is connected to the corresponding touch transmission signal terminal.

[0183] One of the second voltage signal provided by the second voltage signal terminal V2 and the third voltage signal provided by the third voltage signal terminal V3 has a voltage value greater than the voltage value of the first voltage signal provided by the first voltage signal terminal V1, and the other has a voltage value less than the voltage value of the first voltage signal.

[0184] Exemplarily, as shown in Figures 8 and 9, the first touch signal terminal S1 is a touch transmission signal terminal. In this case, the first output circuit 201 is also connected to the third voltage signal terminal V3, and a first touch signal terminal S1 is connected to the third voltage signal terminal V3 through a third switch K3.

[0185] Alternatively, the second touch signal terminal S2 is a touch transmission signal terminal. In this case, the second output circuit 202 is also connected to the third voltage signal terminal V3. A second touch signal terminal S2 is connected to the third voltage signal terminal V3 through a third switch K3.

[0186] By setting the third switch K3, the on-off between the touch transmission signal terminal and the third voltage signal terminal V3 can be independently controlled. While realizing the voltage control of the touch transmission signal terminal, the circuit structure is simple, which is conducive to achieving the effect of reducing the area of ​​the touch chip.

[0187] Exemplarily, the voltage value provided by the third voltage signal terminal V3 is different from the voltage values ​​provided by the first voltage signal terminal V1 and the second voltage signal terminal V2. For example, the third voltage signal terminal V3 may be the second power supply terminal Lvdd, and the voltage provided by the second power supply terminal Lvdd is a low voltage that is lower than the ground voltage provided by the ground signal terminal GND.

[0188] During the driving process of the touch driving circuit 20b, within a touch detection cycle, the first switch K1, the second switch K2 and the third switch K3 are closed in a time-sharing manner, and the first power signal, the second power signal or the third power signal is transmitted to the touch transmission signal end in a time-sharing manner, thereby changing the voltage of the touch transmission signal end, thereby forming different basic capacitances in the touch structure 11.

[0189] When the base capacitance values ​​of the touch structure 11 vary, the capacitance change of the touch structure 11 during the same touch operation will vary depending on the base capacitance value. By adding the third voltage signal terminal V3 and the third switch K3, corresponding sensing signals can be detected based on a variety of different base capacitance values ​​during a touch detection cycle, thereby improving the accuracy of touch position detection.

[0190] In some embodiments, as shown in Figures 6 and 7, in the first output circuit 201 and the second output circuit 202, the output circuit connected to the touch sensing signal terminal includes: a fourth switch K4 and a fifth switch K5. The first end of the fourth switch K4 is connected to the first voltage signal terminal V1, and the second end of the fourth switch K4 is connected to the corresponding touch sensing signal terminal; the first end of the fifth switch K5 is connected to the second voltage signal terminal V2, and the second end of the fifth switch K5 is connected to the corresponding touch sensing signal terminal.

[0191] For example, as shown in Figure 6, the second touch signal terminal S2 is a touch sensing signal terminal, connected to the first voltage signal terminal V1 via the fourth switch K4, and connected to the second voltage signal terminal V2 via the fifth switch K5. As shown in Figure 7, the first touch signal terminal S1 is a touch sensing signal terminal, connected to the first voltage signal terminal V1 via the fourth switch K4, and connected to the second voltage signal terminal V2 via the fifth switch K5.

[0192] By providing the fourth switch K4 and the fifth switch K5, the on-off connection between the touch sensing signal terminal and the first voltage signal terminal V1 and the second voltage signal terminal V2 is independently controlled. While achieving voltage control of the touch sensing signal terminal, the circuit structure is simple, which is conducive to reducing the area of ​​the touch chip.

[0193] In some embodiments of the present disclosure, the first touch signal terminal S1 is a touch transmission signal terminal, and the second touch signal terminal S2 is a touch sensing signal terminal. Alternatively, the first touch signal terminal S1 is a touch sensing signal terminal, and the second touch signal terminal S2 is a touch transmission signal terminal. The specific design can be determined based on actual needs and is not limited in this disclosure.

[0194] Accordingly, the embodiments of the present disclosure further provide a display device 100. As shown in FIG1 , in the display device 100, the touch driving circuit 20 connected to the display panel 10 can be the touch driving circuit 20b provided in any of the above embodiments.

[0195] The display device 100 equipped with the touch driving circuit 20 b has the corresponding beneficial technical effects of the touch driving circuit 20 b , which will not be described in detail here.

[0196] FIG10 is a planar structural diagram of a display device according to some embodiments. To clearly describe some embodiments of the present disclosure, FIG10 only shows a touch structure 11 and some touch leads CK. The display device 100 also includes other structures.

[0197] FIG11 is a touch driving timing diagram according to some embodiments. The duration of each stage in the diagram is only for schematic illustration and is not intended to limit the driving duration of each stage in an actual driving process.

[0198] Embodiments of the present disclosure provide a method for driving a touch driver circuit. This method can be applied to the touch driver circuit 20b provided in any of the aforementioned embodiments. In the touch driver circuit 20b, where the first touch signal terminal S1 is a touch transmission signal terminal and the second touch signal terminal S2 is a touch sensing signal terminal, the first touch electrode 11a in the display panel 10 is a touch driver electrode Tx, and the second touch electrode 11c is a touch sensing electrode Rx.

[0199] As shown in Figures 10 and 11, when the touch driving circuit 20b performs touch driving on the display panel 10, the touch driving circuit 20b applies a first driving signal to the corresponding touch driving electrode 11a through the touch transmitting signal end within the touch detection period Tc, and detects the touch position according to the capacitance change of the touch structure 11 in the display panel 10.

[0200] Exemplarily, as shown in FIG11 , the touch detection cycle Tc includes a mutual capacitance detection phase T1 , and the driving method of the touch driving circuit 20 b includes the mutual capacitance detection phase T1 . The mutual capacitance detection phase T1 includes the following driving process.

[0201] S1, as shown in Figures 9, 10, 12 and 13, in the mutual capacitance detection stage T1, the first output circuit 201 applies a first drive signal to the first touch signal terminal S1; the second touch signal terminal S2 transmits a second touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10.

[0202] For example, as shown in FIG12 , in the mutual capacitance detection stage T1 , the plurality of first output circuits 201 may apply the first drive signal to the corresponding first touch signal terminal S1 in sequence; or, as shown in FIG13 , in the mutual capacitance detection stage T1 , the plurality of first output circuits 201 may apply the first drive signal to the corresponding first touch signal terminal S1 simultaneously.

[0203] Based on this, regardless of whether the multiple first output circuits 201 apply the first drive signals to the corresponding first touch signal terminals S1 sequentially or simultaneously, the duration of the mutual capacitance detection phase T1 can be the same. The specific design can be adaptively tailored to actual needs. This is merely an example of some possible implementations and does not limit the present disclosure.

[0204] In some embodiments, as shown in FIG11 , a noise detection stage ND (Noise Detect) is further included before the mutual capacitance detection stage T1 .

[0205] Before the mutual capacitance detection phase T1 begins, the first output circuit 201 does not transmit a voltage signal to the first touch signal terminal S1. At this time, the first touch signal terminal S1 does not issue a first drive signal. Simultaneously, the second control switch G2 is closed, connecting the second touch signal terminal S2 to the corresponding analog front-end circuit AFE. The second touch channel 112 in the display panel 10 transmits the voltage of each second touch electrode 11c to the corresponding analog front-end circuit AFE via the second touch signal terminal S2, thereby detecting the frequency of interference noise in the display panel 10 and the touch drive circuit 20b. When the frequency of the touch drive signal (e.g., the first drive signal) is the same as or close to that of the interference noise, the touch drive signal undergoes frequency hopping processing, adjusting its frequency to a different frequency from the noise. This prevents noise interference with the touch signal and ensures the reliability of the touch drive process.

[0206] In this way, the interference noise is detected before the mutual capacitance detection phase T1 begins. Then, during the mutual capacitance detection phase T1, the received touch drive signal can be corrected based on the detected interference noise (the frequency of the touch drive signal is corrected to have a large difference from the frequency of the interference noise), thereby reducing the impact of the interference noise on the accuracy of touch position detection.

[0207] The following describes a specific driving process of the touch driving circuit 20b in the mutual capacitance detection phase T1, taking as an example an example where the touch driving circuit 20b includes 40 first touch signal terminals S1, 20 second touch signal terminals S2, and 20 analog front-end circuits AFE, and the first output circuit 201 is connected to the first voltage signal terminal V1, the second voltage signal terminal V2, and the third voltage signal terminal V3.

[0208] The 40 first touch signal terminals S1 are sequentially the first touch signal terminal S1(1) to the first touch signal terminal S1(40); the 20 second touch signal terminals S2 are sequentially the second touch signal terminal S2(1) to the second touch signal terminal S2(20); and the 20 analog front-end circuits AFE are sequentially the analog front-end circuit AFE(1) to the analog front-end circuit AFE(20).

[0209] As shown in FIG14 , the mutual capacitance detection phase T1 includes the following phases t1 to t4 .

[0210] In the stage t1 , the first output circuit 201 resets the potential of the first touch signal terminal S1 , and the second output circuit 202 resets the potential of the second touch signal terminal S2 .

[0211] For example, as shown in Figures 14 and 15, during phase t1, in the first output circuit 201, the first switch K1 and the second switch K2 are open, and the third switch K3 is closed. The third voltage provided by the third voltage signal terminal V3 is transmitted to the corresponding first touch signal terminal S1 via the third switch K3, so that the voltage of the first touch signal terminal S1 is stably maintained at the third voltage. The first control switch G1 is opened, and the first touch signal terminal S1 is disconnected from the corresponding analog front-end circuit AFE.

[0212] As shown in Figures 14 and 15, during stage t1, in the second output circuit 202, the fifth switch K5 is open and the fourth switch K4 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding second touch signal terminal S2 via the fourth switch K3, thereby stabilizing the voltage at the second touch signal terminal S2 at the first voltage. The second control switch G2 is open, disconnecting the second touch signal terminal S2 from the corresponding analog front-end circuit AFE.

[0213] The first voltage may be a ground voltage. In the stage t1, the voltage of the second touch signal terminal S2 is stabilized at the first voltage to reset the second touch signal terminal S2. At this time, the voltage on the corresponding second touch channel 112 in the touch structure 11 of the display panel 10 is reset to 0V.

[0214] Correspondingly, during stage t1, in the display panel 10, the voltage of each first touch electrode 11a in the first touch channel 111 connected to the first touch signal terminal S1 is stably maintained at the third voltage. The voltage of each second touch electrode 11c in the second touch channel 112 connected to the second touch signal terminal S2 is stably maintained at the first voltage. The value of the basic capacitance (mutual capacitance) formed in the touch structure 11 of the display panel 10 (between adjacent first touch electrodes 11a and second touch electrodes 11c) is the absolute value of the difference between the first voltage and the third voltage.

[0215] As shown in FIG14 , the first voltage signal terminal V1 can be the ground signal terminal GND, with a first voltage of 0V; the second voltage signal terminal V2 can be the first power supply terminal Hvdd, with a second voltage of HVDD; and the third voltage signal terminal V3 can be the second power supply terminal Lvdd, with a third voltage of LVDD. During stage t1, the value of the basic capacitance formed in the touch sensing structure 11 of the display panel 10 is |LVDD|.

[0216] This is merely an example of a possible specific implementation of the present disclosure. The first voltage signal terminal V1, the second voltage signal terminal V2 and the third voltage signal terminal V3 can be adaptively designed according to actual needs, and the present disclosure does not limit this.

[0217] In the t2 phase, the second touch signal terminal S2 transmits a second touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10. For example, as shown in FIG14 , the t2 phase includes the first driving phase t 21 , and the second driving stage t 22 .

[0218] As shown in Figures 14 and 16, in the first driving stage t 21 In the first output circuit 201, the second switch K2 and the third switch K3 are open, and the first switch K1 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding first touch signal terminal S1 through the first switch K1, so that the voltage of the first touch signal terminal S1 jumps from the third voltage to the first voltage. The first control switch G1 is opened, and the first touch signal terminal S1 is disconnected from the corresponding analog front-end circuit AFE.

[0219] As shown in Figures 14 and 16, in the first driving stage t 21 In the second output circuit 202, the fourth switch K4 and the fifth switch K5 are open, and the second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. The second control switch G2 is closed, and the second touch signal terminal S2 is electrically connected to the corresponding analog front-end circuit AFE, transmitting the charge signal of the second touch electrode 11c received by the second touch signal terminal S2 to the corresponding analog front-end circuit AFE.

[0220] Correspondingly, in the first driving stage t 21 The voltage of each first touch electrode 11a in the first touch channel 111 of the display panel 10 jumps from the third voltage to the first voltage. Simultaneously with the voltage jump of the first touch electrode 11a, the voltage of the second touch electrode 11c also jumps accordingly. During this process, an electrical signal corresponding to the voltage value of each second touch electrode 11c in the second touch channel 112 is transmitted to the corresponding analog front-end circuit AFE via the second touch signal terminal S2, thereby determining the touch position based on the second touch detection signal. The second touch detection signal includes the electrical signal corresponding to the voltage value of the second touch electrode 11c.

[0221] For example, as shown in FIG14 , in the first driving stage t 21 , the voltage of the first touch signal terminal S1 jumps from LVDD to 0, and correspondingly, the voltage of the first touch electrode 11a in the display panel 10 jumps from LVDD to 0. The second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. Therefore, the second touch signal terminal S2 does not transmit a voltage signal to the connected second touch channel 112.

[0222] Based on this, in the first driving stage t 21In the absence of a touch operation, the voltage of the second touch electrode 11c jumps from 0 to -LVDD, and the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |LVDD|. However, when a touch operation is performed, the mutual capacitance generated by the touch structure 11 at the touched location changes, and the voltage of the second touch electrode 11c corresponding to the touched location deviates from -LVDD.

[0223] The second touch channels 112 in the display panel 10 transmit electrical signals corresponding to the voltage values ​​of the second touch electrodes 11 c to the corresponding analog front-end circuit AFE, thereby determining the touch position according to the detected voltage values ​​of the second touch electrodes 11 c in the display panel 10 .

[0224] As shown in Figures 14 and 17, in the second driving stage t 22 In the first output circuit 201, the first switch K1 and the third switch K3 are open, and the second switch K2 is closed. The second voltage provided by the second voltage signal terminal V2 is transmitted to the corresponding first touch signal terminal S1 via the second switch K2, causing the voltage of the first touch signal terminal S1 to jump from the first voltage to the second voltage. The first control switch G1 is opened, disconnecting the first touch signal terminal S1 from the corresponding analog front-end circuit AFE.

[0225] As shown in Figures 14 and 17, in the second driving stage t 22 In the second output circuit 202, the fourth switch K4 and the fifth switch K5 are open, and the second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. The second control switch G2 is closed, and the second touch signal terminal S2 is electrically connected to the corresponding analog front-end circuit AFE, transmitting the charge signal of the second touch electrode 11c received by the second touch signal terminal S2 to the corresponding analog front-end circuit AFE.

[0226] Correspondingly, in the second driving phase t 22 , the voltage of each first touch electrode 11a in the first touch channel 111 in the display panel 10 jumps from the first voltage to the second voltage; at the same time as the voltage of the first touch electrode 11a jumps, the voltage of the second touch electrode 11c also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each second touch electrode 11c in the second touch channel 112 is transmitted to the corresponding analog front-end circuit AFE through the second touch signal terminal S2, so that the touch position is determined according to the second touch detection signal.

[0227] For example, as shown in FIG14 , in the second driving stage t 22, the voltage of the first touch signal terminal S1 jumps from 0 to HVDD. Correspondingly, the voltage of the first touch electrode 11a in the display panel 10 jumps from 0 to HVDD. The second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. Therefore, the second touch signal terminal S2 does not transmit a voltage signal to the connected second touch channel 112. Based on this, when no touch operation is performed, the voltage of the second touch electrode 11c jumps from -LVDD to -LVDD + HVDD, and the value of the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |LVDD|.

[0228] Based on this, in the second driving stage t 22 In the example, when there is no touch operation, the voltage of the second touch electrode 11c jumps from -LVDD to -LVDD + HVDD, and the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |LVDD|. However, when there is a touch operation, the mutual capacitance generated by the touch structure 11 at the touched position changes during the process of touching the display panel 10, and the voltage of the second touch electrode 11c corresponding to the touched position deviates from -LVDD + HVDD.

[0229] The second touch channels 112 in the display panel 10 transmit electrical signals corresponding to the voltage values ​​of the second touch electrodes 11 c to the corresponding analog front-end circuit AFE, thereby determining the touch position according to the detected voltage values ​​of the second touch electrodes 11 c in the display panel 10 .

[0230] In the stage t3 , the first output circuit 201 resets the potential of the first touch signal terminal S1 , and the second output circuit 202 resets the potential of the second touch signal terminal S2 .

[0231] For example, as shown in Figures 14 and 18, during phase t3, in the first output circuit 201, the first switch K1 and the third switch K3 are open, and the second switch K2 is closed. The second voltage provided by the second voltage signal terminal V2 is transmitted to the corresponding first touch signal terminal S1 via the second switch K2, so that the voltage of the first touch signal terminal S1 is stably maintained at the second voltage. The first control switch G1 is opened, and the first touch signal terminal S1 is disconnected from the corresponding analog front-end circuit AFE.

[0232] As shown in Figures 14 and 18, during stage t3, in the second output circuit 202, the fifth switch K5 is open and the fourth switch K4 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding second touch signal terminal S2 via the fourth switch K3, thereby stabilizing the voltage at the second touch signal terminal S2 at the first voltage. The second control switch G2 is opened, disconnecting the second touch signal terminal S2 from the corresponding analog front-end circuit AFE.

[0233] The first voltage may be a ground voltage. In the stage t1, the voltage of the second touch signal terminal S2 is stabilized at the first voltage to reset the second touch signal terminal S2. At this time, the voltage on the corresponding second touch channel 112 in the touch structure 11 of the display panel 10 is reset to 0V.

[0234] Correspondingly, during stage t3, in the display panel 10, the voltage of each first touch electrode 11a in the first touch channel 111 connected to the first touch signal terminal S1 is stably maintained at the second voltage. The voltage of each second touch electrode 11c in the second touch channel 112 connected to the second touch signal terminal S2 is stably maintained at the first voltage. The value of the basic capacitance (mutual capacitance) formed in the touch structure 11 of the display panel 10 (between adjacent first touch electrodes 11a and second touch electrodes 11c) is the absolute value of the difference between the first voltage and the second voltage.

[0235] In phase t4 , the second touch signal terminal S2 transmits a second touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10 .

[0236] For example, as shown in FIG14 , the t4 phase includes the third driving phase t 41 and the fourth driving stage t 42 .

[0237] As shown in Figures 14 and 19, in the third driving stage t 41 In the first output circuit 201, the second switch K2 and the third switch K3 are open, and the first switch K1 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding first touch signal terminal S1 through the first switch K1, so that the voltage of the first touch signal terminal S1 jumps from the second voltage to the first voltage. The first control switch G1 is opened, and the first touch signal terminal S1 is disconnected from the corresponding analog front-end circuit AFE.

[0238] As shown in Figures 14 and 19, in the third driving stage t 41 In the second output circuit 202, the fourth switch K4 and the fifth switch K5 are open, and the second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. The second control switch G2 is closed, and the second touch signal terminal S2 is electrically connected to the corresponding analog front-end circuit AFE, transmitting the charge signal of the second touch electrode 11c received by the second touch signal terminal S2 to the corresponding analog front-end circuit AFE.

[0239] Correspondingly, in the third driving phase t 41, the voltage of each first touch electrode 11a in the first touch channel 111 in the display panel 10 jumps from the second voltage to the first voltage; at the same time as the voltage of the first touch electrode 11a jumps, the voltage of the second touch electrode 11c also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each second touch electrode 11c in the second touch channel 112 is transmitted to the corresponding analog front-end circuit AFE through the second touch signal terminal S2, so that the touch position is determined according to the second touch detection signal.

[0240] For example, as shown in FIG14 , in the third driving stage t 41 , the voltage of the first touch signal terminal S1 jumps from HVDD to 0, and correspondingly, the voltage of the first touch electrode 11a in the display panel 10 jumps from HVDD to 0. The second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. Therefore, the second touch signal terminal S2 does not transmit a voltage signal to the connected second touch channel 112.

[0241] Based on this, in the third driving stage t 41 In the absence of a touch operation, the voltage of the second touch electrode 11c jumps from 0 to -HVDD, and the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |HVDD|. However, during a touch operation, the mutual capacitance generated by the touch structure 11 at the touch location changes, and the voltage of the corresponding second touch electrode 11c at the touch location deviates from -HVDD.

[0242] The second touch channels 112 in the display panel 10 transmit electrical signals corresponding to the voltage values ​​of the second touch electrodes 11 c to the corresponding analog front-end circuit AFE, thereby determining the touch position according to the detected voltage values ​​of the second touch electrodes 11 c in the display panel 10 .

[0243] As shown in FIG14 and FIG20, in the fourth driving stage t 42 In the first output circuit 201, the first switch K1 and the second switch K2 are open, and the third switch K3 is closed. The third voltage provided by the third voltage signal terminal V3 is transmitted to the corresponding first touch signal terminal S1 via the third switch K3, causing the voltage of the first touch signal terminal S1 to jump from the first voltage to the third voltage. The first control switch G1 is opened, disconnecting the first touch signal terminal S1 from the corresponding analog front-end circuit AFE.

[0244] As shown in FIG14 and FIG20, in the fourth driving stage t 42In the second output circuit 202, the fourth switch K4 and the fifth switch K5 are open, and the second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. The second control switch G2 is closed, and the second touch signal terminal S2 is electrically connected to the corresponding analog front-end circuit AFE, transmitting the charge signal of the second touch electrode 11c received by the second touch signal terminal S2 to the corresponding analog front-end circuit AFE.

[0245] Correspondingly, in the fourth driving stage t 42 , the voltage of each first touch electrode 11a in the first touch channel 111 in the display panel 10 jumps from the first voltage to the third voltage; at the same time as the voltage of the first touch electrode 11a jumps, the voltage of the second touch electrode 11c also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each second touch electrode 11c in the second touch channel 112 is transmitted to the corresponding analog front-end circuit AFE through the second touch signal terminal S2, so that the touch position is determined according to the second touch detection signal.

[0246] For example, as shown in FIG14 , in the fourth driving stage t 42 , the voltage of the first touch signal terminal S1 jumps from 0 to LVDD. Correspondingly, the voltage of the first touch electrode 11a in the display panel 10 jumps from 0 to LVDD. The second output circuit 202 does not transmit a voltage signal to the second touch signal terminal S2. Therefore, the second touch signal terminal S2 does not transmit a voltage signal to the connected second touch channel 112. Based on this, when no touch operation is performed, the voltage of the second touch electrode 11c jumps from -HVDD to -HVDD + LVDD, and the value of the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |HVDD|.

[0247] Based on this, in the fourth driving stage t 42 In the example, when there is no touch operation, the voltage of the second touch electrode 11c jumps from -HVDD to -HVDD + LVDD, and the basic capacitance formed in the touch structure 11 in the display panel 10 remains at |HVDD|. However, when there is a touch operation, the mutual capacitance generated by the touch structure 11 at the touch position changes during the process of touching the display panel 10, and the voltage of the second touch electrode 11c corresponding to the touch position deviates from -HVDD + LVDD.

[0248] The second touch channels 112 in the display panel 10 transmit electrical signals corresponding to the voltage values ​​of the second touch electrodes 11 c to the corresponding analog front-end circuit AFE, thereby determining the touch position according to the detected voltage values ​​of the second touch electrodes 11 c in the display panel 10 .

[0249] In the mutual capacitance detection phase T1 , the driving phases t1 to t4 are repeated to detect the touch position on the display panel 10 .

[0250] In some embodiments, as shown in FIG11 , the touch detection phase Tc further includes a self-capacitance detection phase (e.g., T2 and T3 shown in FIG11 ). The driving method of the touch driving circuit 20 b further includes the self-capacitance detection phase T2 , which includes the following driving processes Q2 and Q3 .

[0251] Q2. As shown in Figures 21, 22 and 23, in the first self-capacitance detection stage T2, the first output circuit 201 applies a first drive signal to the first touch signal terminal S1; at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit the first touch detection signal to the corresponding analog front-end circuit AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0252] For example, in the first self-capacitance detection stage T2, first, as shown in FIG21, the second switch K2 is closed, and the second voltage provided by the second voltage signal terminal V2 is transmitted to the first touch signal terminal S1. Accordingly, the voltage of each first touch electrode 11a in the display panel 10 is the second voltage (for example, HVDD), and a basic capacitance is formed between the first touch electrode 11a and the ground. The same basic capacitance (self-capacitance) is formed at each position in the touch structure 11. When a finger touches the display panel 10, the capacitance value of the touch structure 11 at the finger touch position will change. Each first touch electrode 11a in the display panel 10 transmits a first touch detection signal to the corresponding analog front-end circuit AFE. According to the first touch detection signal, the change in the capacitance formed between the first touch electrode 11a and the ground can be obtained.

[0253] Next, as shown in FIG22 and FIG23 , the first control switch G1 is closed, and the first touch electrode 11 a transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the first control switch G1 , thereby determining the touch position according to the first touch detection signal.

[0254] As shown in Figures 11, 22 and 23, multiple (two or more) first control switches G1 connected to the same analog front-end circuit AFE are closed in a time-sharing manner, and multiple first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit the first touch detection signal to the analog front-end circuit AFE in a time-sharing manner.

[0255] For example, as shown in FIG11 , the first self-capacitance detection stage T2 includes the first stage T 21 and the second stage T 22 As shown in Figure 22, in the first stage T 21, the first control switch G1 between the odd-numbered first touch signal terminal S1 and its corresponding analog front-end circuit AFE is closed, and the odd-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1. As shown in FIG23, in the second stage T 22 The first control switch G1 between the even-numbered first touch signal terminal S1 and the corresponding analog front-end circuit AFE is closed, and the even-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1.

[0256] Q3. As shown in Figures 24 and 25, in the second self-capacitance detection stage T3, the second output circuit 202 applies a second drive signal to the second touch signal terminal S2; the second touch signal terminal S2 transmits a second touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10.

[0257] For example, in the second self-capacitance detection stage T3, first, as shown in FIG24 , the fifth switch K5 is closed, and the second voltage provided by the second voltage signal terminal V2 is transmitted to the second touch signal terminal S2. Accordingly, the voltage of each second touch electrode 11c in the display panel 10 is the second voltage (e.g., HVDD), and a basic capacitance is formed between the second touch electrode 11c and the ground. The same basic capacitance (self-capacitance) is formed at each position in the touch structure 11. When a finger touches the display panel 10, the capacitance value of the touch structure 11 at the finger touch position will change. Each first touch electrode 11a and second touch electrode 11c in the display panel 10 transmits a second touch detection signal to the corresponding analog front-end circuit AFE. Based on the second touch detection signal, the change in the capacitance formed between the second touch electrode 11c and the ground can be obtained.

[0258] Next, as shown in FIG25 , the second control switch G2 is closed, and the second touch electrode 11 c transmits the second touch detection signal to the corresponding analog front-end circuit AFE through the second control switch G2 , thereby determining the touch position according to the second touch detection signal.

[0259] For example, when the touch detection stage Tc includes the mutual capacitance detection stage T1 and the self capacitance detection stage, the order of the mutual capacitance detection stage and the self capacitance detection stage is not limited and can be designed accordingly as needed, which is not limited in the present disclosure.

[0260] 26 is a planar structural diagram of a display device according to some embodiments. To facilitate a clear description of some embodiments of the present disclosure, FIG26 only shows the touch structure 11 and part of the touch leads CK, and the display device 100 also includes other structures.

[0261] FIG27 is a touch driving timing diagram according to some embodiments. The duration of each stage in the diagram is only for schematic illustration and is not intended to limit the driving duration of each stage in an actual driving process.

[0262] In some embodiments, as shown in FIG. 26 and FIG. 27 , the first touch electrode 11 a is a touch emitting electrode, and the second touch electrode 11 c is a touch sensing electrode.

[0263] During the self-capacitance detection phase (T2 or T3), only the first touch electrode 11a or the second touch electrode 11c receives the touch drive signal (the first drive signal or the second drive signal), and transmits a sensing signal (the first touch detection signal or the second touch detection signal) to the corresponding touch drive circuit based on the change in capacitance within the touch structure 11. At this point, only the first touch electrode 11a or the second touch electrode 11c within the touch structure 11 participates in the touch drive process. Therefore, the duration of a single self-capacitance detection phase (T2 or T3) is shorter, resulting in a faster touch response.

[0264] During the mutual capacitance detection phase T1, the first touch electrode 11a receives a first drive signal, and the second touch electrode 11c transmits a second touch detection signal to the corresponding second touch signal terminal S2 based on the change in capacitance within the touch structure 11. At this point, all touch electrodes D within the touch structure 11 participate in the touch drive process. Therefore, the duration of the mutual capacitance detection phase T1 is longer than that of a single self-capacitance detection phase. However, mutual capacitance drive provides higher accuracy in touch position detection, enabling multi-touch control of the display device 100.

[0265] When the number of first touch signal terminals S1 and second touch signal terminals S2 is the same, if the touch detection phase Tc includes the mutual capacitance detection phase T1 and the self-capacitance detection phase, then during the touch detection phase Tc, the touch position is detected by both mutual capacitance driving and self-capacitance driving, resulting in higher accuracy in detecting the control position. Alternatively, the touch detection phase Tc may include only the mutual capacitance detection phase T1. In this case, since the self-capacitance detection phase is not required, the duration of the touch detection phase Tc is shorter, the reporting rate of the display panel 10 is higher, and the display panel 10 has a higher response rate to touch operations.

[0266] In some cases, for example, when there are water droplets at some locations on the display device 100 (for example, in the area corresponding to the touch electrode D), capacitance will also be formed between the water droplets and the touch electrode D (the first touch electrode 11a and / or the second touch electrode 11c). Therefore, the capacitance at some locations in the touch structure 11 will deviate from the basic capacitance, thereby reducing the accuracy of touch position detection.

[0267] Alternatively, when the display device 100 is touched while wearing gloves, due to the presence of the gloves, the capacitance change of the touch structure 11 at the touch position when the display device 100 is touched will be lower than the capacitance change within the touch structure 11 when the finger directly touches the display device 100. In this way, the touch operation may not be recognized, affecting the detection accuracy of the touch position.

[0268] By making the touch detection stage Tc include the mutual capacitance detection stage T1 and the self capacitance detection stage, the touch position is detected and identified through two touch detection methods, which can reduce the impact of external factors (such as the aforementioned water droplets and gloves, etc.) on the touch detection accuracy and improve the accuracy of touch position detection.

[0269] Such a design can avoid the influence of moisture and gloves on touch detection, and the display device 100 also has waterproof touch and glove touch functions.

[0270] The order of the first self-capacitance detection stage T2 and the second self-capacitance detection stage T3 can be adaptively designed as needed, and the present disclosure does not limit this.

[0271] In some embodiments of the present disclosure, the touch detection circuit 20b driving method provided herein may include the touch detection phase Tc solely comprising the mutual capacitance detection phase T1. Alternatively, as shown in FIG11 , the touch detection phase Tc may include both the mutual capacitance detection phase T1 and the self-capacitance detection phase. The specific design may be adaptive as needed and is not limited in this disclosure.

[0272] Embodiments of the present disclosure also provide another method for driving a touch driver circuit. This method can be applied to the touch driver circuit 20b provided in any of the aforementioned embodiments. In the case where the first touch signal terminal S1 of the touch driver circuit 20b is a touch sensing signal terminal and the second touch signal terminal S2 is a touch transmitting signal terminal, the first touch electrode 11a of the display panel 10 is a touch sensing electrode Rx, and the second touch electrode 11c is a touch driver electrode Tx.

[0273] As shown in Figures 26 and 27, when the touch driving circuit 20b performs touch driving on the display panel 10, the touch driving circuit 20b applies a first driving signal to the corresponding touch driving electrode 11c through the touch transmitting signal end within the touch detection period Tc, and detects the touch position according to the capacitance change of the touch structure 11 in the display panel 10.

[0274] Exemplarily, as shown in FIG. 27 , the touch detection cycle Tc includes a mutual capacitance detection phase T1 , and the driving method of the touch driving circuit 20 b includes the mutual capacitance detection phase T1 . The mutual capacitance detection phase T1 includes the following driving process.

[0275] S01, as shown in Figures 26, 28, 29 and 30, in the mutual capacitance detection stage T1, the second output circuit 202 applies a second drive signal to the second touch signal terminal S2; at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit the first touch detection signal to the analog front-end circuit AFE connected thereto in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0276] For example, as shown in FIG28 , in the mutual capacitance detection stage T1 , the plurality of first output circuits 201 may apply the first drive signal to the corresponding second touch signal terminal S2 in sequence; or, as shown in FIG29 , in the mutual capacitance detection stage T1 , the plurality of first output circuits 201 may apply the first drive signal to the corresponding second touch signal terminal S2 at the same time.

[0277] Based on this, regardless of whether the multiple first output circuits 201 apply the first drive signals to the corresponding second touch signal terminals S2 sequentially or simultaneously, the duration of the mutual capacitance detection phase T1 can be the same. The specific design can be adaptive based on actual needs. This is merely an example of some possible implementations and does not limit the present disclosure.

[0278] For example, as shown in FIG27 , the mutual capacitance detection phase T1 includes a first mutual capacitance detection phase T 11 and the second mutual capacitance detection stage T 12 As shown in Figure 30, in the first mutual capacitance detection stage T 11 , the first control switch G1 between the odd-numbered first touch signal terminal S1 and its corresponding analog front-end circuit AFE is closed, and the odd-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1. In the second mutual capacitance detection stage T 12 The first control switch G1 between the even-numbered first touch signal terminal S1 and the corresponding analog front-end circuit AFE is closed, and the even-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1.

[0279] As shown in FIG31 , the mutual capacitance detection phase T1 includes the following phases t1 to t4 .

[0280] During phase t1, as shown in Figures 30 and 31, the first switch K1 and the second switch K2 are open, and the third switch K3 is closed. The third voltage provided by the third voltage signal terminal V3 is transmitted to the corresponding second touch signal terminal S2 via the third switch K3, so that the voltage of the second touch signal terminal S2 is stably maintained at the third voltage. The second control switch G2 is opened, and the second touch signal terminal S2 is disconnected from the corresponding analog front-end circuit AFE.

[0281] During stage t1, as shown in Figures 30 and 31, the fifth switch K5 is open and the fourth switch K4 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding first touch signal terminal S1 via the fourth switch K3, thereby stabilizing the voltage of the first touch signal terminal S1 at the first voltage. The first control switch G1 is open, disconnecting the first touch signal terminal S1 from the corresponding analog front-end circuit AFE.

[0282] Correspondingly, during stage t1, in the display panel 10, the voltage of each first touch electrode 11a in the first touch channel 111 connected to the first touch signal terminal S1 is stably maintained at the first voltage. The voltage of each second touch electrode 11c in the second touch channel 112 connected to the second touch signal terminal S2 is stably maintained at the third voltage. The value of the basic capacitance (mutual capacitance) formed in the touch structure 11 of the display panel 10 (between adjacent first touch electrodes 11a and second touch electrodes 11c) is the absolute value of the difference between the first voltage and the third voltage.

[0283] In the t2 phase, the first touch signal terminal S1 transmits a first touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10. For example, as shown in FIG31 , the t2 phase includes the first driving phase t 21 , and the second driving stage t 22 .

[0284] In the first driving stage t 21 As shown in Figures 30 and 31, the second switch K2 and the third switch K3 are open, and the first switch K1 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding second touch signal terminal S2 through the first switch K1, so that the voltage of the second touch signal terminal S2 jumps from the third voltage to the first voltage. The second control switch G2 is opened, and the second touch signal terminal S2 is disconnected from the corresponding analog front-end circuit AFE.

[0285] In the first driving stage t 2130 and 31 , the fourth switch K4 and the fifth switch K5 are opened, the first control switch G1 is closed, the first output circuit 201 is connected to the corresponding analog front-end circuit AFE, and the charge signal of the first touch electrode 11 c received by the first touch signal terminal S1 is transmitted to the corresponding analog front-end circuit AFE.

[0286] Correspondingly, in the first driving stage t 21 , the voltage of each second touch electrode 11c in the second touch channel 112 of the display panel 10 jumps from the third voltage to the first voltage; when the voltage at the second touch signal terminal S2 jumps, the voltage of the second touch electrodes 11c also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each first touch electrode 11a in the first touch channel 111 is transmitted to the corresponding analog front-end circuit AFE via the first touch signal terminal S1, thereby determining the touch position based on the first touch detection signal. The first touch detection signal includes the electrical signal corresponding to the voltage value of the first touch electrode 11a.

[0287] In the second driving stage t 22 As shown in Figures 30 and 31, the first switch K1 and the third switch K3 are open, and the second switch K2 is closed. The second voltage provided by the second voltage signal terminal V2 is transmitted to the corresponding second touch signal terminal S2 via the second switch K2, causing the voltage at the second touch signal terminal S2 to jump from the first voltage to the second voltage. The second control switch G2 is opened, disconnecting the second touch signal terminal S2 from the corresponding analog front-end circuit AFE.

[0288] In the second driving stage t 22 As shown in Figures 30 and 31, the fourth switch K4 and the fifth switch K5 are opened, the second control switch G2 is closed, the first touch signal terminal S1 is connected to the corresponding analog front-end circuit AFE, and the charge signal of the first touch electrode 11a received by the first touch signal terminal S1 is transmitted to the corresponding analog front-end circuit AFE.

[0289] Correspondingly, in the second driving phase t 22 , the voltage of each second touch electrode 11c in the second touch channel 112 in the display panel 10 jumps from the first voltage to the second voltage; at the same time as the voltage of the second touch electrode 11c jumps, the voltage of the first touch electrode 11a also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each first touch electrode 11a in the first touch channel 111 is transmitted to the corresponding analog front-end circuit AFE through the first touch signal terminal S1, so that the touch position is determined according to the first touch detection signal.

[0290] During phase t3, as shown in Figures 30 and 31, the first switch K1 and the third switch K3 are open, and the second switch K2 is closed. The second voltage provided by the second voltage signal terminal V2 is transmitted to the corresponding second touch signal terminal S2 via the second switch K2, so that the voltage at the second touch signal terminal S2 is stabilized at the second voltage. The second control switch G2 is opened, disconnecting the second touch signal terminal S2 from the corresponding analog front-end circuit AFE.

[0291] During stage t3, as shown in Figures 30 and 31, the fifth switch K5 is opened and the fourth switch K4 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding first touch signal terminal S1 via the fourth switch K3, thereby stabilizing the voltage of the first touch signal terminal S1 at the first voltage. The first control switch G1 is opened, disconnecting the first touch signal terminal S1 from the corresponding analog front-end circuit AFE.

[0292] Correspondingly, during stage t3, in the display panel 10, the voltage of each second touch electrode 11c in the second touch channel 112 connected to the second touch signal terminal S2 is stably maintained at the second voltage. The voltage of each first touch electrode 11a in the first touch channel 111 connected to the first touch signal terminal S1 is stably maintained at the first voltage. The value of the basic capacitance (mutual capacitance) formed in the touch structure 11 of the display panel 10 (between adjacent first touch electrodes 11a and second touch electrodes 11c) is the absolute value of the difference between the first voltage and the second voltage.

[0293] In phase t4 , the first touch signal terminal S1 transmits a first touch detection signal to the connected analog front-end circuit AFE based on the capacitance variation of the touch structure 11 in the display panel 10 .

[0294] For example, as shown in FIG31 , the t4 phase includes the third driving phase t 41 and the fourth driving stage t 42 .

[0295] In the third driving stage t 41 As shown in Figures 30 and 31, the second switch K2 and the third switch K3 are open, and the first switch K1 is closed. The first voltage provided by the first voltage signal terminal V1 is transmitted to the corresponding second touch signal terminal S2 through the first switch K1, so that the voltage of the second touch signal terminal S2 jumps from the second voltage to the first voltage. The second control switch G2 is opened, and the second touch signal terminal S2 is disconnected from the corresponding analog front-end circuit AFE.

[0296] In the third driving stage t 41As shown in Figures 30 and 31, the fourth switch K4 and the fifth switch K5 are opened, the second control switch G2 is closed, the first touch signal terminal S1 is connected to the corresponding analog front-end circuit AFE, and the charge signal of the first touch electrode 11a received by the first touch signal terminal S1 is transmitted to the corresponding analog front-end circuit AFE.

[0297] Correspondingly, in the third driving phase t 41 , the voltage of each second touch electrode 11c in the second touch channel 112 in the display panel 10 jumps from the second voltage to the first voltage; at the same time as the voltage of the second touch electrode 11c jumps, the voltage of the first touch electrode 11a also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each first touch electrode 11a in the first touch channel 111 is transmitted to the corresponding analog front-end circuit AFE through the first touch signal terminal S1, so that the touch position is determined according to the first touch detection signal.

[0298] In the fourth driving stage t 42 As shown in Figures 30 and 31, the first switch K1 and the second switch K2 are open, and the third switch K3 is closed. The third voltage provided by the third voltage signal terminal V3 is transmitted to the corresponding second touch signal terminal S2 via the third switch K3, causing the voltage of the second touch signal terminal S2 to jump from the first voltage to the third voltage. The second control switch G2 is opened, disconnecting the second touch signal terminal S2 from the corresponding analog front-end circuit AFE.

[0299] In the fourth driving stage t 42 As shown in Figures 30 and 31, the fourth switch K4 and the fifth switch K5 are opened, the second control switch G2 is closed, the first touch signal terminal S1 is connected to the corresponding analog front-end circuit AFE, and the charge signal of the first touch electrode 11a received by the first touch signal terminal S1 is transmitted to the corresponding analog front-end circuit AFE.

[0300] Correspondingly, in the fourth driving stage t 42 , the voltage of each second touch electrode 11c in the second touch channel 112 in the display panel 10 jumps from the first voltage to the third voltage; at the same time as the voltage of the second touch electrode 11c jumps, the voltage of the first touch electrode 11a also jumps accordingly. During this process, the electrical signal corresponding to the voltage value of each first touch electrode 11a in the first touch channel 111 is transmitted to the corresponding analog front-end circuit AFE through the first touch signal terminal S1, so that the touch position is determined according to the first touch detection signal.

[0301] In the mutual capacitance detection phase T1 , the driving phases t1 to t4 are repeated to detect the touch position on the display panel 10 .

[0302] In some embodiments, as shown in FIG31 , the touch detection phase Tc further includes a self-capacitance detection phase (e.g., T2 and T3 shown in FIG31 ). The driving method of the touch driving circuit 20 b further includes a self-capacitance detection phase, which includes the following driving processes S02 and S03 .

[0303] S02. As shown in Figures 30 and 31, the first output circuit 201 applies a first driving signal to the first touch signal terminal S1; at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit first touch detection signals to their respective connected analog front-end circuits AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0304] For example, as shown in Figures 30 and 31, in the first self-capacitance detection stage T2, the second switch K2 is first closed to transmit the second voltage provided by the second voltage signal terminal V2 to the second touch signal terminal S2. Accordingly, the voltage of each second touch electrode 11c in the display panel 10 is the second voltage (e.g., HVDD).

[0305] Next, as shown in FIG30 and FIG31 , the second control switch G2 is closed, and the second touch electrode 11 c transmits the second touch detection signal to the corresponding analog front-end circuit AFE through the second control switch G2 , thereby determining the touch position according to the second touch detection signal.

[0306] S03. As shown in Figures 30 and 31, the second output circuit 202 applies a second driving signal to the second touch signal terminal S2; the second touch signal terminal S2 transmits a second touch detection signal to the connected analog front-end circuit AFE based on the capacitance change of the touch structure 11 in the display panel 10.

[0307] In the second self-capacitance detection phase T3, first, the fifth switch K5 is closed to transmit the second voltage provided by the second voltage signal terminal V2 to the first touch signal terminal S1. Accordingly, the voltage of each first touch electrode 11a in the display panel 10 is the second voltage (eg, HVDD).

[0308] Then, as shown in Figures 30 and 31, multiple (two or more) first control switches G1 connected to the same analog front-end circuit AFE are closed in a time-sharing manner, and multiple first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit the first touch detection signal to the analog front-end circuit AFE in a time-sharing manner.

[0309] For example, as shown in FIG31 , the second self-capacitance detection stage T3 includes the first stage T 31 and the second stage T 32 As shown in Figure 30, in the first stage T 31, the first control switch G1 between the odd-numbered first touch signal terminal S1 and its corresponding analog front-end circuit AFE is closed, and the odd-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1. 32 The first control switch G1 between the even-numbered first touch signal terminal S1 and the corresponding analog front-end circuit AFE is closed, and the even-numbered first touch signal terminal S1 transmits the first touch detection signal to the corresponding analog front-end circuit AFE through the closed first control switch G1.

[0310] The order of the first self-capacitance detection stage T2 and the second self-capacitance detection stage T3 can be adaptively designed as needed, and the present disclosure does not limit this.

[0311] For example, when the touch detection stage Tc includes the mutual capacitance detection stage T1 and the self capacitance detection stage, the order of the mutual capacitance detection stage and the self capacitance detection stage is not limited and can be designed accordingly as needed, which is not limited in the present disclosure.

[0312] When the number of first touch signal terminals S1 and second touch signal terminals S2 is the same, if the touch detection phase Tc includes only the mutual capacitance detection phase T1, then the duration of the touch detection phase Tc is short, the reporting rate of the display panel 10 is high, and the response rate of the display panel 10 to the touch operation is fast; alternatively, the touch detection phase Tc may include the mutual capacitance detection phase T1 and the self-capacitance detection phase. Then, in the touch detection phase Tc, while the touch position is detected by mutual capacitance driving, the touch position is also detected by self-capacitance driving, and the detection accuracy of the control position is higher.

[0313] Embodiments of the present disclosure also provide a touch driver circuit 20c. As shown in FIG32 , the touch driver circuit 20c includes: a plurality of first touch signal terminals S1, a plurality of second touch signal terminals S2, and a plurality of analog front-end circuits (AFEs). The number of analog front-end circuits (AFEs) is less than the number of first touch signal terminals S1, and less than the number of second touch signal terminals S2.

[0314] Among them, each analog front-end circuit AFE in at least one analog front-end circuit AFE is connected to at least two first touch signal terminals S1, and the analog front-end circuit AFE connected to at least two first touch signal terminals S1 is configured to receive the first touch detection signal from at least two first touch signal terminals S1 in a time-sharing manner.

[0315] Each analog front-end circuit AFE in at least one analog front-end circuit AFE is connected to at least two second touch signal terminals S2, and the analog front-end circuit AFE connected to at least two second touch signal terminals S2 is configured to receive the second touch detection signals from the at least two second touch signal terminals S2 in a time-sharing manner.

[0316] This embodiment provides a touch driving circuit 20c. By multiplexing analog front-end circuits AFE, the number of analog front-end circuits AFE is less than the number of first touch signal terminals S1 and less than the number of second touch signal terminals S2, thereby reducing the number of analog front-end circuits AFE in the touch driving circuit 20c and reducing the cost and size of the touch driving chip.

[0317] In some embodiments, as shown in FIG32 , the number of first touch signal terminals S1 is equal to the number of second touch signal terminals S2 , and each analog front-end circuit AFE is connected to at least two first touch signal terminals S1 and to at least two second touch signal terminals S2 .

[0318] Exemplarily, the touch driving circuit 20c includes 6 first touch signal terminals S1 and 6 second touch signal terminals S2, and accordingly, also includes 3 analog front-end circuits AFE, one analog front-end circuit AFE connecting two first touch signal terminals S1 and two second touch signal terminals S2.

[0319] In this way, the analog front-end circuit AFE is multiplexed with the first touch signal terminal S1 and the second touch signal terminal S2, thereby further reducing the number of analog front-end circuits AFE in the touch driving circuit 20c.

[0320] It should be noted that, in the touch driving circuit 20 c , one analog front-end circuit AFE may also be connected to three or more first touch signal terminals S1 and / or second touch signal terminals S2 , and the specific design may be adaptively performed as needed.

[0321] In some embodiments, as shown in Figure 32, the touch driving circuit 20c also includes an analog-to-digital conversion circuit 205. The analog-to-digital conversion circuit 205 and the analog front-end circuit AFE are further configured to send the processed analog signal to the analog-to-digital conversion circuit 205.

[0322] The analog-to-digital conversion circuit 205 in this embodiment may be an analog-to-digital converter ADC. The connection relationship between the analog-to-digital conversion circuit 205 and the remaining structures in the touch driving circuit 20c and the specific working process can be found in the previous description of the touch driving circuit 20b, which will not be repeated here.

[0323] The embodiments of the present disclosure further provide a display device 100. The touch driving circuit 20 connected to the display panel 10 in the display device 100 may be the touch driving circuit 20c provided in the above embodiment.

[0324] The embodiment of the present disclosure further provides another method for driving a touch driving circuit. The method for driving a touch driving circuit can be applied to the touch driving circuit 20c provided in any of the above embodiments. The driving method includes a mutual capacitance detection phase (e.g., the first self-capacitance detection phase T in FIG. 33 ). 11 and the second self-capacitance detection stage T 12 ), the first touch signal terminal S1 in the touch driving circuit 20c is a touch transmitting signal terminal, and the second touch signal terminal S2 is a touch sensing signal terminal.

[0325] Based on this, the mutual capacity detection stage includes:

[0326] S001, the first output circuit 201 applies a first drive signal to the first touch signal terminal S1; at least two second touch signal terminals S2 connected to the same analog front-end circuit AFE transmit second touch detection signals to the respective connected analog front-end circuits AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0327] Some embodiments of the present disclosure are described by taking the first touch signal terminal S1 as a touch transmission signal terminal and the second touch signal terminal S2 as a touch sensing signal terminal as an example.

[0328] As shown in Figures 33 and 34, in the mutual capacitance detection stage T1, the first touch signal terminal S1 applies a first drive signal to the connected first touch channel 111, and the second touch signal terminal S2 receives the second touch detection signal sent by the connected second touch channel 112, and sends the second touch detection signal to the connected analog front-end circuit AFE.

[0329] As shown in Figure 32, the two second touch signal terminals S2 are connected to the same analog front-end circuit AFE. The second touch detection signal transmitted by each second touch signal terminal S2 is different. Therefore, the two second touch signal terminals S2 need to be connected with the analog front-end circuit AFE in a time-sharing manner to transmit the second touch detection signal to the analog front-end circuit AFE in a time-sharing manner.

[0330] The specific circuit operation process can be found in the above description of the touch simulation circuit 20 b, which will not be repeated here.

[0331] In some embodiments, the touch driving circuit driving method further includes a self-capacitance detection stage, which includes:

[0332] S002. The first output circuit 201 applies a first driving signal to the first touch signal terminal S1; at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit a first touch detection signal to the corresponding analog front-end circuit AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0333] S003, the second output circuit 202 applies a second driving signal to the second touch signal terminal S2; at least two second touch signal terminals S2 connected to the same analog front-end circuit AFE transmit the second touch detection signal to the corresponding analog front-end circuit AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0334] The specific circuit operation process can be found in the above description of the touch simulation circuit 20 b, which will not be repeated here.

[0335] In other embodiments, the first touch signal terminal S1 in the touch driving circuit 20c is a touch sensing signal terminal, and the second touch signal terminal S2 is a touch transmitting signal terminal. Based on this, the mutual capacitance detection phase includes: the second output circuit 202 applies a second driving signal to the second touch signal terminal S2; and at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit first touch detection signals to their respective connected analog front-end circuits AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0336] The self-capacitance detection stage includes the following driving processes.

[0337] The first output circuit 201 applies a first driving signal to the first touch signal terminal S1; at least two first touch signal terminals S1 connected to the same analog front-end circuit AFE transmit a first touch detection signal to the corresponding analog front-end circuit AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0338] The second output circuit 202 applies a second driving signal to the second touch signal terminal S2; at least two second touch signal terminals S2 connected to the same analog front-end circuit AFE transmit a second touch detection signal to the corresponding analog front-end circuit AFE in a time-sharing manner based on the capacitance change of the touch structure 11 in the display panel 10.

[0339] The specific circuit operation process can be found in the above description of the touch simulation circuit 20 b, which will not be repeated here.

[0340] Embodiments of the present disclosure also provide a touch driver circuit 20d. The touch driver circuit 20d includes: a plurality of first touch signal terminals S1, a plurality of second touch signal terminals S2, and a plurality of analog front-end circuits (AFEs). The number of the first touch signal terminals S1 is greater than or equal to the number of the second touch signal terminals S2, and the number of the analog front-end circuits (AFEs) is less than the number of the first touch signal terminals S1. Each of the at least one analog front-end circuits (AFEs) is connected to at least two of the first touch signal terminals S1.

[0341] Based on this, when the number of the first touch signal terminals S1 is equal to the number of the second touch signal terminals S2 , each analog front-end circuit AFE in the at least one analog front-end circuit AFE is connected to at least two second touch signal terminals S2 .

[0342] When the number of first touch signal terminals S1 is greater than the number of second touch signal terminals S2, and the number of analog front-end circuits AFE is less than or equal to the number of second touch signal terminals S2, each analog front-end circuit AFE in at least one analog front-end circuit AFE is connected to at least two second touch signal terminals S2, or one analog front-end circuit AFE is connected to one second touch signal terminal S2.

[0343] When the number of analog front-end circuits AFE is greater than the number of second touch signal terminals S2, each analog front-end circuit AFE in at least one analog front-end circuit AFE is connected to a second touch signal terminal S2, and each analog front-end circuit AFE in at least one analog front-end circuit AFE is not connected to the second touch signal terminal S2.

[0344] For example, the first touch signal terminal S1 can be a touch transmission signal terminal, and the second touch signal terminal can be a touch sensing signal terminal. Based on this, in the touch structure 11, the first touch electrode 11a is the touch drive electrode Tx, and the second touch electrode 11c is the touch sensing electrode Rx. During the mutual capacitance detection phase, the first touch signal terminal S1 sends a touch drive signal to the first touch channel 111 of the touch structure 11. The second touch channel 112 transmits a touch sensing signal to the second touch signal terminal S2 based on the capacitance change in the touch structure 11 to detect the touch position.

[0345] Alternatively, the first touch signal terminal S1 can be a touch sensing signal terminal, and the second touch signal terminal can be a touch transmitting signal terminal. Based on this, in the touch structure 11, the first touch electrode 11a is the touch sensing electrode Rx, and the second touch electrode 11c is the touch driving electrode Tx. During the mutual capacitance detection phase, the second touch signal terminal S2 sends a touch driving signal to the second touch channel 112 of the touch structure 11. The first touch channel 111 transmits a touch sensing signal to the first touch signal terminal S1 based on the capacitance change in the touch structure 11 to detect the touch position.

[0346] In some embodiments, during the touch driving process of the touch driving circuit 20d, self-capacitance detection can be performed using the first touch channel 111 of the touch structure 11. During this self-capacitance detection phase, after applying a first driving signal to the first touch channel 111 in the display panel 10 via the first touch signal terminal S1, the first touch channel 111 transmits a first touch detection signal to the corresponding first touch signal terminal S1 based on the capacitance change in the touch structure 11. The first touch signal terminal S1 then transmits the received first touch detection signal to the corresponding analog front-end circuit AFE.

[0347] An analog front-end circuit AFE is connected to multiple (two or more) first touch signal terminals S1, and the multiple first touch signal terminals S1 are connected to the analog front-end circuit AFE in a time-sharing manner. The analog front-end circuit AFE receives the first touch detection signals from each first touch signal terminal S1 connected to it in a time-sharing manner.

[0348] In some embodiments, during the touch driving process of the touch driving circuit 20d, the second touch channel 112 of the touch structure 11 may be used to perform self-capacitance detection. During this self-capacitance detection phase, after applying a second driving signal to the second touch channel 112 in the display panel 10 via the second touch signal terminal S2, the second touch channel 112 transmits a second touch detection signal to the corresponding second touch signal terminal S2 based on the capacitance change in the touch structure 11. The second touch signal terminal S2 then transmits the received second touch detection signal to the corresponding analog front-end circuit AFE.

[0349] In a case where an analog front-end circuit AFE is connected to a second touch signal terminal S2 , the second touch signal terminal S2 sends the second touch detection signal to the analog front-end circuit AFE.

[0350] When an analog front-end circuit AFE is connected to multiple (two or more) second touch signal terminals S2, the multiple second touch signal terminals S2 are connected to the analog front-end circuit AFE in a time-sharing manner, and the analog front-end circuit AFE receives the second touch detection signals from each second touch signal terminal S2 connected thereto in a time-sharing manner.

[0351] In some embodiments, the touch driving circuit 20 d includes m first touch signal terminals S1 , n second touch signal terminals S2 , and k analog front-end circuits AFE; m, n, k are all positive integers, and m≥n.

[0352] Exemplarily, m>k>n. Taking m≤2n as an example, in the touch driving circuit 20d, each of the (mk) analog front-end circuits AFE is connected to two first touch signal terminals S1, and each of the other (2k-m) analog front-end circuits AFE is connected to one first touch signal terminal S1. Each of the n analog front-end circuits AFE is connected to one second touch signal terminal S2, and each of the other (kn) analog front-end circuits AFE is not connected to the second touch signal terminal S2.

[0353] Alternatively, m≥n≥k, including the following cases.

[0354] For example, m>n>k, and taking m≤2n as an example, in the touch driving circuit 20d, each of the (2k-m) analog front-end circuits AFE is connected to one first touch signal terminal S1, and each of the other (mk) analog front-end circuits AFE is connected to two first touch signal terminals S1. Each of the (2k-n) analog front-end circuits AFE is connected to one second touch signal terminal S2, and each of the other (nk) analog front-end circuits AFE is connected to two second touch signal terminals S2.

[0355] For another example, m>n=k, taking m≤2n as an example, in the touch driving circuit 20d, the connection method between the first touch signal terminal S1, the second touch signal terminal S2 and the analog front-end circuit AFE can refer to the previous description of the touch driving circuit 20b, and will not be repeated here.

[0356] For another example, m=n>k, in the touch driving circuit 20d, the connection method between the first touch signal terminal S1, the second touch signal terminal S2 and the analog front-end circuit AFE can refer to the above description of the touch driving circuit 20c, which will not be repeated here.

[0357] For another example, m=n=k, in the touch driving circuit 20 d , an analog front-end circuit AFE is connected to a first touch signal terminal S1 and a second touch signal terminal S2 .

[0358] In some embodiments, the touch driving circuit 20 d includes 76 first touch signal terminals S1 and 51 second touch signal terminals S2 .

[0359] Then, the touch driving circuit 20d may also include 60 analog front-end circuits (AFEs). Each of 16 of the AFEs is connected to two first touch signal terminals S1, and each of the other 44 AFEs is connected to one first touch signal terminal S1. Each of the 55 AFEs is connected to one second touch signal terminal S2, and the other 5 AFEs are not connected to the second touch signal terminal S2.

[0360] Alternatively, the touch driving circuit 20d may include 45 analog front-end circuits (AFEs). Each of 21 of the AFEs is connected to two first touch signal terminals S1, and each of the other 24 AFEs is connected to one first touch signal terminal S1. Each of 6 AFEs is connected to two second touch signal terminals S2, and each of the other 39 AFEs is connected to one second touch signal terminal S2.

[0361] In some other embodiments, the touch driving circuit 20d includes eight first touch signal terminals S1 and eight second touch signal terminals S2.

[0362] Then, the touch driving circuit 20b may include eight analog front-end circuits AFE, wherein each analog front-end circuit AFE is connected to a first touch signal terminal S1 and a second touch signal terminal S2 respectively.

[0363] In this way, in the touch driving circuit 20d, at least part of the analog front-end circuits AFE are multiplexed among the multiple analog front-end circuits AFE, thereby reducing the number of analog front-end circuits AFE in the touch driving circuit 20d while keeping the number of first touch signal terminals S1 and second touch signal terminals S2 unchanged, thereby reducing the size of the touch driving circuit 20d and reducing the size and cost of the touch chip.

[0364] It should be noted that in the touch driving circuit 20d, an analog front-end circuit AFE may also be connected to three or more first touch signal terminals S1 and / or second touch signal terminals S2, and the specific design can be adaptively adapted as needed. The driving process of the touch driving circuit 20d is described above for the touch driving circuit 20b and the touch driving circuit 20c, and will not be repeated here.

[0365] The embodiment of the present disclosure further provides a display panel 10. As shown in FIG35 , the display panel 10 includes a display substrate 12 and a touch structure 11.

[0366] In some examples, the display panel 10 includes a display substrate 12 and a touch panel disposed on one side of the display substrate 12. The touch panel includes a touch structure 11, and the touch structure 11 is electrically connected to the display substrate 12. For example, the touch panel can be disposed on the light-emitting side of the display substrate 12.

[0367] In this case, the display function of the display device 100 is implemented by the display substrate 12, and the touch function of the display device 100 is implemented by the touch panel mounted on the display substrate 12. The display panel 10 and the touch panel can be manufactured separately and then assembled. In this way, the display panel 10 and the touch panel can be manufactured simultaneously, thereby improving the manufacturing efficiency of the display device 100.

[0368] In other examples, as shown in FIG1 , a display panel 10 includes a display substrate 12 and a touch structure 11 disposed on one side of the display substrate 12. The touch structure 11 is disposed on the display substrate 12 and is electrically connected to the display substrate 12. The touch structure 11 is configured to implement a touch function, and the display substrate 12 is configured to implement a display function. For example, the touch structure 11 may be disposed on the light-emitting side of the display substrate 12.

[0369] In this case, the display panel 10 is a touch display panel, and a single display panel 10 can realize both display functions and touch functions. Thus, during the manufacturing process of the display panel 10, the display substrate 12 can be formed first, and then the touch structure 11 can be formed on the display substrate 12. Since the touch structure 11 can be formed on the display substrate 12, there is no need to provide a base substrate for the touch structure 11, thereby reducing the thickness of the display panel 10 and facilitating a lightweight and thin design of the display panel 10.

[0370] The display substrate 12 includes, for example, a substrate and a drive circuit layer disposed on the substrate. The substrate can be made of either rigid or flexible materials. Rigid materials include, but are not limited to, glass and PCBs (Printed Circuit Boards). Flexible materials include, but are not limited to, PI (Polyimide Film) and FPCs (Flexible Printed Circuits).

[0371] Accordingly, the display panel 10 can be a rigid display panel or a flexible display panel, and the display device 100 can be a rigid display device (for example, a flat or curved display, and an electronic device equipped with the flat or curved display, etc.), or a flexible display device (for example, a foldable mobile phone, or a foldable flat panel display, etc.).

[0372] In an embodiment of the present disclosure, Figures 35 and 36 are planar structural diagrams of the display device 100. In order to clearly describe the connection method between the display panel 10 and the driving chip (not shown in the figures), the first binding area B1 of the display panel 10 is displayed on the same side of the display area AA in Figures 35 and 36. It should be noted that in the final display panel 10, the first binding area B1 is bent to the other side.

[0373] In some embodiments, as shown in Figures 35 and 36 , the display panel 10 includes a display area AA and a first bonding area B1 located on one side of the display area AA for bonding a driver chip. The driver chip can be a touch driver chip or an integrated touch and display driver chip. A plurality of first touch pins and a plurality of second touch pins are provided within the first bonding area B1. Each first touch pin is connected to a first touch channel 111, and each second touch pin is connected to a second touch channel 112.

[0374] Exemplarily, a driver chip is provided with the touch driver circuit 20 provided in any of the aforementioned embodiments (e.g., the touch driver circuit 20b or the touch driver circuit 20c). The driver chip has a plurality of first touch connection blocks and a plurality of second touch connection blocks. Each first touch connection block is connected to a first touch signal terminal S1 in the touch driver circuit 20, and each second touch connection block is connected to a second touch signal terminal S2 in the touch driver circuit 20.

[0375] During the preparation of the display device 100, in the process of correspondingly connecting the driver chip to the display panel 10, for example, a bonding process is used to correspondingly connect the touch pins (for example, the first touch pin 31, the second touch pin 33) on the display panel 10 and the connection blocks (for example, the first touch connection block 71, the second touch connection block 73) on the driver chip.

[0376] For example, anisotropic conductive film (ACF) is attached to the first bonding area B1 of the display panel 10 , and then the driver chip is pressed onto the ACF using a thermo-compression process, thereby correspondingly connecting the driver chip to the display panel 10 .

[0377] In the touch driving circuit 20 provided in some embodiments of the present disclosure, the first touch signal terminal S1 may be a touch transmitting signal terminal, and the second touch signal terminal S2 may be a touch sensing signal terminal; or the first touch signal terminal S1 may be a touch sensing signal terminal, and the second touch signal terminal S2 may be a touch transmitting signal terminal.

[0378] Accordingly, as shown in Figures 35, 36, and 45, in the touch structure 11 of the display panel 10 connected to the touch drive circuit 20, the first touch channel 111 can be a touch drive channel, the first touch electrode 11a is a touch drive electrode Tx, the second touch channel 112 is a touch sensing channel, and the second touch electrode 11c is a touch sensing electrode Rx. Alternatively, the first touch channel 111 can be a touch sensing channel, the first touch electrode 11a is a touch sensing electrode Tx, the second touch channel 112 is a touch drive channel, and the second touch electrode 11c is a touch drive electrode Rx.

[0379] As shown in FIG35 , FIG36 and FIG45 , the size of the display panel 10 along the first direction X is larger than the size along the second direction Y. Thus, the length of the first touch channel 111 in the touch structure 11 is smaller than the length of the second touch channel 112 .

[0380] The length of the second touch channel 112 is, for example, twice the length of the first touch channel 111. During the touch driving process, electrical signals (such as the first driving signal or the second driving signal, or the first touch detection signal and the second touch detection signal, as described above) are sequentially transmitted from the second touch electrode 11c at one end of the second touch channel 112 to the second touch electrode 11c at the other end. If the length of the second touch channel 112 is long, the time difference between the second touch electrodes 11c at the two ends of the second touch channel 112 receiving or sending the electrical signals is large.

[0381] Based on this, when the first touch electrode 11a is the touch drive electrode Tx and the second touch electrode 11c is the touch sensing electrode Rx, the display panel 10 can adopt a "1T2R" connection method, so that the two ends of the touch sensing channel are connected to the driving chip through different touch leads, thereby reducing the signal delay problem caused by the longer touch sensing channel.

[0382] For example, as shown in Figure 36, each touch drive channel (first touch channel 111) is connected to the driver chip through a first touch lead 2, and the two ends of each touch sensing channel (second touch channel 112) are respectively connected to the driver chip through the second touch lead 4 and the third touch lead 5.

[0383] For example, referring to Figure 45, each touch driving channel (first touch channel 111) is connected to the driving chip through a first touch lead 2, and the two ends of each touch sensing channel (second touch channel 112) are respectively connected to the driving chip through the second touch lead 4 and the fourth touch lead 8.

[0384] When the first touch electrode 11a can be the touch sensing electrode Rx and the second touch electrode 11c can be the touch driving electrode Tx, the display panel 10 can adopt a "2T1R" connection method, so that the two ends of the touch driving channel are connected to the driving chip through different touch leads, thereby reducing the signal delay problem caused by the long touch driving channel.

[0385] For example, as shown in Figure 36, the two ends of each driving sensing channel (second touch channel 112) are respectively connected to the second touch lead 4 and the third touch lead 5 and the driving chip, and each touch sensing channel (first touch channel 111) is connected to the driving chip through a first touch lead 2.

[0386] For example, referring to Figure 45, the two ends of each touch driving channel (second touch channel 112) are respectively connected to the second touch lead 4 and the fourth touch lead 8 and the driving chip, and each touch sensing channel (first touch channel 111) is connected to the driving chip through a first touch lead 2.

[0387] The following describes the structure in the area (first binding area B1 ) of the display panel 10 used for connecting to the driver chip, and the connection method between the touch leads CK and the touch structure 11 in the display panel 10 .

[0388] Figures 37 and 38 are enlarged schematic diagrams of the first binding area B1 of the display panel 10, illustrating the extension direction and arrangement of some pins used to connect to the driver chip in the display panel 10. It should be understood that the number of pins used to connect to the driver chip in the display panel 10 is not limited to that shown in the figures.

[0389] Figures 39 to 44, 46, and 47 are enlarged views of the connection locations between the touch leads CK and the touch pins (e.g., first pin 3 and second pin 6). To clearly illustrate the arrangement of the pins (e.g., first pin 3 and second pin 6) for connecting to the driver chip within the first binding area B1 of the display panel 10, and their connection to the touch leads CK, only the touch leads CK and the pins for connecting to the driver chip are shown. It is understood that the first binding area B1 of the display panel 10 may also include structures other than those shown in the figures.

[0390] In Figures 39 to 44, 46 and 47, the touch structure 11 of the display panel 10 includes 40 first touch channels 111 and 20 second touch channels 112, and the touch driving circuit 20 includes 40 first touch signal terminals S1 and 20 second touch signal terminals S2. The numbers in brackets in the figure mark are numbers. The first touch channels 111, first touch leads 2 and first touch signal terminals S1 with the same numbers are connected correspondingly, and the first touch channels 111, first touch leads 2 and first touch signal terminals S1 with the same numbers are connected correspondingly. For example, 31(1) is the first touch pin 31(1) numbered 1, and 2(1) is the first touch lead 2(1) numbered 1.

[0391] In some embodiments, as shown in Figures 35 and 36, the display panel 10 also includes a first border area K1 and a second border area K2, respectively located on opposite sides of the display area AA in the second direction Y, and a first binding area B1 located on the non-display surface opposite to the display surface of the display panel 10. The first binding area B1 and the first border area K1 and the second border area K2 are respectively located on different sides of the display area AA.

[0392] In some embodiments, as shown in Figures 35 and 36 , the display panel 10 further includes a third border region K3 and a fourth border region K4 located on opposite sides of the display area AA in the first direction X, and the first binding region B1 and the fourth border region K4 are located on the same side of the display area AA. The first binding region B1 and the fourth border region K4 being located on the same side of the display panel 10 means that both the first binding region B1 and the fourth border region K4 are located on the side of the display panel 10 used for bonding the driver chip.

[0393] In some embodiments, the first direction X is perpendicular to the second direction Y. As shown in Figures 37 and 38 , the first binding area B1 includes a first pin area J1, a second pin area J2, and a third pin area J3 arranged in sequence along the second direction Y and pointing from the first border area K1 to the second border area K2.

[0394] For example, as shown in Figures 37 and 38 , a plurality of first pins 3 are provided in the first binding area B1, and the plurality of first pins 3 are arranged in N rows (N ≥ 1) and in multiple columns, with the column direction intersecting or overlapping with the second direction Y. The plurality of first pins 3 include: a plurality of data pins 32 provided in the second pin area J2. The data pins 32 are configured to receive data signals required for displaying an image and transmit the data signals to the display panel 10.

[0395] It should be noted that the number of rows of the plurality of first pins 3 is related to the number of the first pins 3 and the size of the first binding area B1 . The following takes the arrangement of the plurality of first pins 3 in three rows as an example to illustrate some embodiments of the present disclosure.

[0396] Multiple first pins 3 are arranged into multiple columns, and the column direction and the second direction Y intersect. The column direction refers to the arrangement direction of the multiple first pins 3 arranged in a column. The arrangement directions of the multiple columns of first pins 3 can be the same or not completely the same, that is, the column direction is not necessarily unique. There can be one, two or more column directions, which is determined according to the specific arrangement method of the multiple first pins 3.

[0397] In some embodiments, the angle formed by the arrangement direction of the first pins 3 in each column and the second direction Y is greater than or equal to 60° and less than or equal to 90°. The angle formed by the arrangement direction of the first pins 3 in each column and the second direction Y can be 60°, 75°, or 90°, etc.

[0398] In some examples, the angle formed by the arrangement direction of the first pins 3 in each column and the second direction Y is greater than or equal to 75° and less than or equal to 90°. The angle formed by the arrangement direction of the first pins 3 in each column and the second direction Y can be 75°, 80°, or 90°, etc.

[0399] It should be noted that the angle range formed by the arrangement direction of each column of first pins 3 and the second direction Y can be adaptively adjusted according to the specific design. This is only used as an example and not as a limitation to the present disclosure.

[0400] In some embodiments, as shown in FIG. 37 and FIG. 38 , the plurality of first pins 3 further include: a plurality of first touch pins 31 and a plurality of second touch pins 33 .

[0401] For example, the plurality of first touch pins 31 are divided into two groups and are respectively arranged in the first pin area J1 and the third pin area J3 . The number of the first touch pins 31 in the two groups can be the same or different, depending on actual needs.

[0402] For example, the plurality of second touch pins 33 are divided into two groups, one each having a fourth pin area J4 and a fifth pin area J5 . The number of the second touch pins 33 in the two groups can be the same or different, depending on actual needs.

[0403] In some embodiments, as shown in Figures 35 and 36 , the touch leads CK include a plurality of first touch leads 2 and a plurality of second touch leads 4. The number of first touch leads 2 is equal to the number of first touch channels 111, and the number of second touch leads 4 is equal to the number of second touch channels 112. One end of each first touch lead 2 is connected to one of the first touch channels 111 in the touch structure 11, and the other end is connected to one of the first touch signal terminals S1 in the touch drive circuit 20. One end of each second touch lead 4 is connected to one of the second touch channels 112 in the touch structure 11, and the other end is connected to one of the second touch signal terminals S2 in the touch drive circuit 20.

[0404] In some embodiments, at least some of the plurality of first touch pins 31 are connected to a plurality of first touch signal terminals S1. In this case, the first touch pins 31 connected to the first touch signal terminals S1 are configured to receive a first touch signal and transmit the first touch signal to the touch structure 11 via the first touch leads 2 (the first touch signal here may be the first drive signal described above).

[0405] The first touch pins 31 among the multiple first touch pins 31 that are not connected to the first touch signal terminal S1 can be used as virtual pins and are not connected to any signal line. Alternatively, they can be connected to other signal lines as needed, thereby increasing the design flexibility of the display panel 10. The specific connected signals are designed accordingly based on actual needs. This is merely an example of a possible implementation method and does not limit the present disclosure.

[0406] As shown in FIG. 35 , FIG. 36 , and FIG. 39 to FIG. 42 , one end of the first touch lead 2 is connected to a first touch channel 111 , and the other end is connected to a first touch pin 31 .

[0407] For example, the plurality of first touch pins 31 connected to the plurality of first touch leads 2 may all be located in the first pin area J1; alternatively, the plurality of first touch pins 31 connected to the plurality of first touch leads 2 may all be located in the third pin area J3; alternatively, the plurality of first touch pins 31 connected to the plurality of first touch leads 2 may partially be located in the first pin area J1 and partially located in the third pin area J3. The number of first touch pins 31 in the first pin area J1 and the third pin area J3 may be the same or different, and can be adaptively designed as needed.

[0408] Based on this, as shown in Figures 35 and 36, the multiple first touch leads 2 can be divided into two groups, extending from the first frame area K1 and the second frame area K2 respectively, and extending to the first pin area J1 and the third pin area J3, and connected to the corresponding first touch pins 31. Alternatively, the multiple first touch leads 2 can all be led from the first frame area K1, extend to the first pin area J1, and connect to the corresponding first touch pins 31. Alternatively, the multiple first touch leads 2 can all be led from the second frame area K2, extend to the third pin area J3, and connect to the corresponding first touch pins 31.

[0409] When the plurality of first touch leads 2 are divided into two groups and respectively led out from the first frame area K1 and the second frame area K2, the number of the first touch leads 2 in the two groups is the same or approximately the same. In this way, the number of wiring of the plurality of first touch leads 2 in the first frame area K1 and the second frame area K2 is the same or approximately the same, which is conducive to ensuring that the non-display area is symmetrically and evenly distributed on both sides of the display area AA, thereby ensuring the aesthetic appearance and picture display effect of the display panel 10.

[0410] In some embodiments, at least some of the plurality of second touch pins 33 are connected to the plurality of second touch signal terminals S2. In this case, the second touch pins 33 connected to the second touch signal terminals S2 are configured to receive a second touch signal and transmit the second touch signal to the touch structure 11 via the second touch lead 4 (the second touch signal here may be the second driving signal described above).

[0411] Among the plurality of second touch pins 33, the second touch pins 33 that are not connected to the second touch signal terminal S2 can be used as virtual pins and are not connected to any signal line. Alternatively, they can be connected to other signal lines as needed, thereby increasing the design flexibility of the display panel 10. The specific connected signals are designed accordingly based on actual needs. This is merely an example of a possible implementation method and does not limit the present disclosure.

[0412] As shown in FIG. 35 , FIG. 36 , and FIG. 39 to FIG. 42 , one end of the second touch lead 4 is connected to a second touch channel 112 , and the other end is connected to a second touch pin 33 .

[0413] The plurality of second touch pins 33 connected to the plurality of second touch leads 4 may all be located in the fourth pin area J4; alternatively, the plurality of second touch pins 33 connected to the plurality of second touch leads 4 may all be located in the fifth pin area J5; alternatively, the plurality of second touch pins 33 connected to the plurality of second touch leads 4 may be partially located in the fourth pin area J4 and partially located in the fifth pin area J5. The number of second touch pins 33 in the fourth pin area J4 and the fifth pin area J5 may be the same or different, and can be adaptively designed as needed.

[0414] Based on this, as shown in Figures 35 and 36, multiple second touch leads 4 can be led out from the fourth frame area K4 and extend into the fourth pin area J4 and / or the fifth pin area J5, and connected to the corresponding second touch pins 33. In this way, the second touch leads 4 do not pass through the remaining frame areas (such as the first frame area K1, the second frame area K2, and the third frame area K3) except the fourth frame area K4, reducing the wiring area within the frame area, thereby reducing the frame width of the display panel 10, increasing the area ratio of the display area AA of the display panel 10, and further improving the visual experience of the display screen of the display panel 10.

[0415] In some embodiments, as shown in FIG38 , the display panel 10 further includes two second binding areas B2 located on a side of the first binding area B1 away from the display area AA and corresponding to the two ends of the first binding area B1. The display panel 10 further includes a plurality of second pins 6 , which are divided into two groups and disposed in the two second binding areas B2 (e.g., the second binding area B2(A) and the second binding area B2(B) shown in FIG38 ).

[0416] The number of the second pins 6 in the second binding area B2 (A) and the second binding area B2 (B) may be the same or different, and may be adaptively designed according to specific needs.

[0417] In some embodiments, at least some of the second pins 6 are connected to the second touch signal terminal S2 of the touch driving circuit 20. The second pins 6 connected to the second touch signal terminal S2 are configured to receive a second touch signal and transmit the second touch signal to the touch structure 11.

[0418] Based on this, as shown in Figures 36, 43, and 44, the touch leads CK further include: a plurality of third touch leads 5, the number of which is the same as the number of second touch channels 112. One end of the third touch lead 5 is connected to a second touch channel 112 in the touch structure 11, and the other end is connected to a second touch signal terminal S2 in the touch driving circuit 20.

[0419] Among the plurality of second pins 6, the second pins 6 that are not connected to the second touch signal terminal S2 can be used as virtual pins and are not connected to any signal line. Alternatively, they can be connected to other signal lines as needed, thereby increasing the design flexibility of the display panel 10. The specific connected signals are designed accordingly based on actual needs. This is merely an example of a possible implementation method and does not limit the present disclosure.

[0420] As shown in FIG. 36 , FIG. 43 and FIG. 44 , one end of the third touch lead 5 is connected to a second touch channel 112 , and the other end is connected to a second pin 6 .

[0421] The multiple second pins 6 connected to the multiple third touch leads 5 can be all located in the second binding area B2(A); or, the multiple second pins 6 connected to the multiple third touch leads 5 are all located in the second binding area B2(B); or, some of the multiple second pins 6 connected to the multiple third touch leads 5 are located in the second binding area B2(A), and the other part is located in the second binding area B2(B).

[0422] Based on this, as shown in FIG36 , multiple third touch leads 5 can be led out from the third frame area K3 and divided into two groups, respectively passing through the first frame area K1 and the second frame area K2 and extending to the second binding area B2(A) and the second binding area B2(B), and connected to the corresponding second pins 6. Alternatively, multiple third touch leads 5 can be led out from the third frame area K3 and all extend through the first frame area K1 to the second binding area B2(A) and connected to the corresponding second pins 6. Alternatively, multiple third touch leads 5 can be led out from the third frame area K3 and all extend through the second frame area K2 to the second binding area B2(B) and connected to the corresponding second pins 6.

[0423] When the plurality of third touch leads 5 are divided into two groups and extend to the first binding area B1 through the first frame area K1 and the second frame area K2 respectively, the number of the third touch leads 5 in the two groups is the same or approximately the same. In this way, the number of wiring of the plurality of third touch leads 5 in the first frame area K1 and the second frame area K2 is the same or approximately the same, which is conducive to ensuring that the non-display area is symmetrically and evenly distributed on both sides of the display area AA, thereby ensuring the aesthetic appearance and picture display effect of the display panel 10.

[0424] In some embodiments, as shown in Figure 36, when the touch lead CK includes multiple second touch leads 2 and multiple third touch leads 5, one end of each second touch channel 12 is connected to a second touch pin 33 through a second touch lead 2, and the other end is connected to a second pin 6 through a third touch lead 5. In this way, the second touch signal terminal S2 in the touch driving circuit 20 transmits signals to the two ends of the second touch channel 12 through the second touch pin 33 and the second pin 6 respectively, thereby reducing the signal path loss of the second touch signal on the transmission path (for example, the second touch signal generates signal distortion during transmission due to the long transmission path), thereby ensuring the transmission reliability of the second touch signal.

[0425] In some embodiments, as shown in FIG. 38 , the display panel 10 includes a plurality of second touch pins 33 and a plurality of second pins 6 , and at least one of the second touch pins 33 and the second pins 6 is connected to the second touch signal terminal S2 in the touch driving circuit 20 .

[0426] When the second touch pin 33 is connected to the second touch signal terminal S2 in the touch drive circuit 20, and the second pin 6 is configured not to be connected to the touch signal line, as shown in FIG45 , the display panel 10 may further include a plurality of fourth touch leads 8 connected to the touch structure 11. The plurality of fourth touch leads 8 may be led from the third frame area K3, divided into two groups, and respectively extend through the first frame area K1 and the second frame area K2 to the fourth pin area J4 and the fifth pin area J5, and connected to the corresponding second touch pin 33. Alternatively, the plurality of fourth touch leads 8 may be led from the third frame area K3, extend through the first frame area K1 and the second frame area K2 to the fourth pin area J4 and the fifth pin area J5, and connected to the corresponding second touch pin 33. Alternatively, the plurality of fourth touch leads 8 may be led from the third frame area K3, extend through the first frame area K1 and the second frame area K2 to the fourth pin area J4 and the fifth pin area J5, and connected to the corresponding second touch pin 33.

[0427] In some embodiments, as shown in Figures 46 and 47, when the display panel 10 includes multiple second touch leads 4 and multiple fourth touch leads 8, the same second touch channel 112 is connected to the same second touch pin 33 through a second touch lead 4 and a fourth touch lead 8, respectively.

[0428] In some embodiments, as shown in Figures 39 to 44, 46, and 47, the display panel 10 further includes a shielding wire 9 located between adjacent first touch leads 2 and second touch leads 4. The plurality of first pins 3 further include a plurality of shielding pins 34 located between adjacent first touch pins 31 and second touch pins 33; the shielding pins 34 are connected to the shielding wire 9.

[0429] Exemplarily, the shielding pin 34 is configured to receive a shielding signal, which is, for example, a constant voltage signal, such as a ground signal GND or a voltage signal VDD.

[0430] When the first touch pin 31 is configured to receive a first touch signal and transmit the first touch signal to the touch structure 11, and the second touch pin 33 is configured to receive a second touch signal and transmit the second touch signal to the touch structure 11, a shielding pin 34 is set between the adjacent first touch pins 31 and the second touch pins 33, and the shielding signal transmitted by the shielding pin 34 and the shielding line 9 is used to separate the adjacent first touch leads 2 and the second touch leads 4, and to separate the adjacent first touch pins 31 and the second touch pins 33, thereby preventing crosstalk between the first touch signal and the second touch signal, and thus ensuring the transmission stability and reliability of the touch signals (for example, the first touch signal and / or the second touch signal).

[0431] It is understandable that when the second touch pin 33 is configured not to transmit a touch signal, the display panel 10 does not include the second touch lead 4, and a shielding pin 34 may or may not be provided between the adjacent first touch pin 31 and the second touch pin 33. In this case, the multiple shielding pins 34 provided can be connected to the shielding signal, or not connected to the signal as a virtual pin. At least a portion of the shielding pins 34 that serve as virtual pins (not connected to the shielding signal) can also be connected to other signals as needed. The specific connected signal is designed accordingly according to actual needs, and is only used here as an illustrative illustration of a possible implementation method, and is not intended to be a limitation on the specific implementation methods of the present disclosure.

[0432] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A touch driving circuit, comprising: a plurality of first touch signal terminals and a plurality of second touch signal terminals, wherein the number of the first touch signal terminals is greater than the number of the second touch signal terminals; a plurality of analog front-end circuits, the number of the analog front-end circuits being equal to the number of the second touch signal terminals; Wherein, one of the analog front-end circuits is connected to a second touch signal terminal, and each of the at least one analog front-end circuit is connected to at least two first touch signal terminals.

2. The touch driving circuit according to claim 1, wherein: Each of the analog front-end circuits is connected to two of the first touch signal terminals and to one of the second touch signal terminals.

3. The touch driving circuit according to claim 1, further comprising: a plurality of first output circuits, each first output circuit being connected to a first touch signal terminal, and the first output circuit being configured to output a first driving signal to the first touch signal terminal; A plurality of second output circuits are provided, each second output circuit is connected to a second touch signal terminal, and the second output circuit is configured to output a second driving signal to the second touch signal terminal.

4. The touch driving circuit according to claim 3, wherein: The number of the first output circuits is greater than the number of the second output circuits, and the number of the second output circuits is equal to the number of the analog front-end circuits.

5. The touch driving circuit according to claim 3 or 4, wherein: The first touch signal terminal is a touch transmission signal terminal, and the second touch signal terminal is a touch sensing signal terminal.

6. The touch driving circuit according to claim 3 or 4, wherein: The first touch signal terminal is a touch sensing signal terminal, and the second touch signal terminal is a touch transmitting signal terminal.

7. The touch driving circuit according to claim 5 or 6, wherein: In the first output circuit and the second output circuit, the output circuit connected to the touch transmission signal terminal includes: A first switch and a second switch, wherein the first end of the first switch is connected to the first voltage signal end, and the second end of the first switch is connected to the corresponding touch transmission signal end; the first end of the second switch is connected to the second voltage signal end, and the second end of the second switch is connected to the corresponding touch transmission signal end.

8. The touch driving circuit according to claim 7, wherein: In the first output circuit and the second output circuit, the output circuit connected to the touch transmission signal terminal further includes: a third switch, wherein a first end of the third switch is connected to the third voltage signal end, and a second end of the third switch is connected to the corresponding touch transmission signal end; A voltage value of one of the second voltage signal provided by the second voltage signal terminal and the third voltage signal provided by the third voltage signal terminal is greater than a voltage value of the first voltage signal provided by the first voltage signal terminal, and a voltage value of the other is less than a voltage value of the first voltage signal.

9. The touch driving circuit according to claim 5 or 6, wherein: In the first output circuit and the second output circuit, the output circuit connected to the touch sensing signal terminal includes: A fourth switch and a fifth switch, wherein the first end of the fourth switch is connected to the first voltage signal end, and the second end of the fourth switch is connected to the corresponding touch sensing signal end; the first end of the fifth switch is connected to the second voltage signal end, and the second end of the fifth switch is connected to the corresponding touch sensing signal end.

10. The touch driving circuit according to any one of claims 1 to 9, further comprising: a plurality of first control switches, wherein the analog front-end circuit connected to the at least two first touch signal terminals is connected to the at least two first touch signal terminals respectively through at least two first control switches; the at least two first control switches are configured to be turned on in a time-sharing manner to transmit the first touch detection signals from the at least two first touch signal terminals to the analog front-end circuit in a time-sharing manner; A plurality of second control switches, each analog front-end circuit is connected to the second touch signal terminal through a second control switch.

11. The touch driving circuit according to claim 10, wherein: The touch driving circuit further includes: a plurality of first electrostatic protection units, each of which is connected between a first touch signal terminal and a first control switch; A plurality of second electrostatic protection units are provided, each of which is connected between a second touch signal terminal and a second control switch.

12. A touch driving circuit, comprising: a plurality of first touch signal terminals and a plurality of second touch signal terminals; a plurality of analog front-end circuits, wherein the number of the analog front-end circuits is smaller than the number of the first touch signal terminals and smaller than the number of the second touch signal terminals; Among them, each analog front-end circuit in at least one analog front-end circuit is connected to at least two first touch signal terminals; each analog front-end circuit in at least one analog front-end circuit is connected to at least two second touch signal terminals.

13. The touch driving circuit according to claim 12, wherein: The number of the first touch signal terminals is equal to the number of the second touch signal terminals, and each analog front-end circuit is connected to at least two first touch signal terminals and at least two second touch signal terminals.

14. A display device comprising: a display panel and a touch driving circuit connected to the display panel; The touch driving circuit is the touch driving circuit according to any one of claims 1 to 11, or the touch driving circuit according to claim 12 or 13; The display panel includes: a plurality of first touch channels arranged in parallel and spaced apart along a first direction, each of the first touch channels extending along a second direction, the first direction intersecting the second direction; one of the first touch channels being connected to a first touch signal terminal of the touch driving circuit; A plurality of second touch channels are arranged in parallel and spaced apart along the second direction, each of the second touch channels being arranged along the second direction. The second touch channel is connected to a second touch signal terminal of the touch driving circuit.

15. A driving method of a touch driving circuit, applied to the touch driving circuit according to any one of claims 1 to 11, wherein the first touch signal terminal in the touch driving circuit is a touch transmitting signal terminal, and the second touch signal terminal is a touch sensing signal terminal; The driving method includes a self-capacitance detection stage, which includes: The first output circuit applies a first driving signal to the first touch signal terminal; At least two first touch signal terminals connected to the same analog front-end circuit transmit first touch detection signals to the corresponding analog front-end circuit in a time-sharing manner based on a capacitance change of a touch structure in the display panel; The second output circuit applies a second driving signal to the second touch signal terminal; The second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

16. The driving method according to claim 15, wherein: The driving method further includes a mutual capacitance detection stage, which includes: The first output circuit applies a first driving signal to the first touch signal terminal; the second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

17. A driving method of a touch driving circuit, applied to the touch driving circuit according to any one of claims 1 to 11, wherein the first touch signal terminal in the touch driving circuit is a touch sensing signal terminal, and the second touch signal terminal is a touch transmitting signal terminal; The driving method includes a mutual capacitance detection stage, and the mutual capacitance detection stage includes: The second output circuit applies a second driving signal to the second touch signal terminal; The at least two first touch signal terminals connected to the same analog front-end circuit transmit first touch detection signals to the analog front-end circuits connected thereto in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

18. The driving method according to claim 17, wherein: The driving method further includes a self-capacitance detection stage, which includes: The first output circuit applies a first drive signal to the first touch signal terminal; the at least two first touch signal terminals connected to the same analog front-end circuit transmit first touch detection signals to the analog front-end circuits connected thereto in a time-sharing manner based on the capacitance change of the touch structure in the display panel; The second output circuit applies a second driving signal to the second touch signal terminal; the second touch signal terminal transmits a second touch detection signal to the connected analog front-end circuit based on the capacitance change of the touch structure in the display panel.

19. A method for driving a touch driving circuit, applied to the touch driving circuit according to claim 12 or 13, wherein the first touch signal terminal in the touch driving circuit is a touch transmitting signal terminal, and the second touch signal terminal is a touch sensing signal terminal; The driving method includes a mutual capacitance detection stage, and the mutual capacitance detection stage includes: The first output circuit applies a first driving signal to the first touch signal terminal; The same analog front-end circuit is connected to the At least two second touch signal terminals transmit second touch detection signals to their respective connected analog front-end circuits in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

20. The driving method according to claim 19, wherein: The driving method further includes a self-capacitance detection stage, which includes: The first output circuit applies a first drive signal to the first touch signal terminal; at least two first touch signal terminals connected to the same analog front-end circuit transmit a first touch detection signal to the corresponding analog front-end circuit in a time-sharing manner based on a capacitance change of a touch structure in the display panel; The second output circuit applies a second drive signal to the second touch signal terminal; at least two second touch signal terminals connected to the same analog front-end circuit transmit a second touch detection signal to the corresponding analog front-end circuit in a time-sharing manner based on the capacitance change of the touch structure in the display panel.

Images