Touch panel, touch system and touch panel control method

Abstract

The present disclosure relates to a touch panel, a touch system and a control method of a touch panel, wherein the touch panel comprises: a touch screen, an excitation coil and a processing unit; the processing unit is used to provide a driving signal to the first electrode and the second electrode in a first touch stage, and determine finger touch data according to the induction receiving signals of the first electrode and the second electrode; and provide an excitation signal to the excitation coil in a second touch stage, and after the excitation signal stops, determine the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode. The touch panel provided by the present disclosure can realize touch detection of fingers and different types of styluses by the touch screen through the same set of touch screen and processing unit, thereby reducing the manufacturing cost of the touch panel.

Description

Technical Field

[0001] The present disclosure relates to the field of touch control technology, and in particular to a touch panel, a touch control system, and a control method of the touch panel. Background Art

[0002] With the rapid development of science and technology, various new touch technologies are increasingly being used in display devices. In touch operation, users can control the display device by touching the touch screen and moving their fingers on the touch screen. However, the operation accuracy and resolution of fingers are low, and only some rough touch operations can be completed. Therefore, stylus pens have entered the public's field of vision, such as capacitive pens and electromagnetic pens. Through the touch operation of the stylus on the touch screen, better accuracy and resolution can be obtained, thereby realizing some complex touch operations.

[0003] The current touch screen combines finger touch and stylus touch, which can effectively improve the operation accuracy and user experience. However, the touch screen and detection system for finger touch can detect the touch operation of the capacitive pen, but cannot detect the touch operation of the electromagnetic pen, and another set of touch screen detection system needs to be set up independently. Therefore, if you want to meet the detection operations of different styluses, you need to set up two sets of touch screens and detection systems when making the display screen, which will lead to a significant increase in the display screen cost of the display device. Therefore, how to realize the touch screen's touch detection of fingers and different types of styluses at a lower cost has become a problem that needs to be solved. Summary of the invention

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a touch panel, a touch system and a control method of the touch panel.

[0005] In a first aspect, the present disclosure provides a touch panel, comprising:

[0006] A touch screen; a touch area of ​​the touch screen is provided with a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction; the first direction and the second direction intersect, so that the first electrodes and the second electrodes are insulated and cross-arranged;

[0007] An excitation coil, wherein the excitation coil is arranged around a touch area of ​​the touch screen;

[0008] a processing unit, wherein the processing unit is electrically connected to the first electrode, the second electrode and the excitation coil respectively;

[0009] The processing unit is used to provide a driving signal to the first electrode and the second electrode in a first touch stage, and determine the finger touch data according to the induction receiving signals of the first electrode and the second electrode; and provide an excitation signal to the excitation coil in a second touch stage, and after the excitation signal stops, determine the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode.

[0010] In some embodiments, both ends of the first electrode are electrically connected to the processing unit through wires; both ends of the second electrode are electrically connected to the processing unit through wires;

[0011] The distribution of each of the wires satisfies any one of the following:

[0012] Each of the wires is led out from one side of the touch area;

[0013] Each of the wires is led out from two sides of the touch area;

[0014] Each of the wires is led out from three sides of the touch area;

[0015] Each of the conductive wires is led out from four sides of the touch control area.

[0016] In some embodiments, each of the wires is led out from one side of the touch area; the side from which each of the wires is led out is a lead-out edge; part of the wires on the side opposite to the lead-out edge are arranged and extended on the left side of the touch area, and part of the wires are arranged and extended on the right side of the touch area.

[0017] In some embodiments, the excitation waveform of the excitation coil is a sine wave or a square wave;

[0018] The excitation frequency of the excitation signal provided by the processing unit to the excitation coil is greater than 10 khz.

[0019] The excitation duration of the excitation signal provided by the processing unit to the excitation coil includes 1-100 microseconds, 100-800 microseconds, and 800-3000 microseconds.

[0020] In some embodiments, the processing unit is configured to:

[0021] In the first touch control stage, a driving signal is provided to the Nth first electrode and the N+1th first electrode, and a sensing reception signal of the Nth first electrode and the N+1th first electrode is obtained;

[0022] Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the finger touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0023] Providing a driving signal to the Mth second electrode and the M+1th second electrode, and acquiring a sensing reception signal of the Mth second electrode and the M+1th second electrode;

[0024] Control M to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and determine the finger touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode;

[0025] Providing a driving signal to a first electrode corresponding to the finger touch coordinates in the first direction, and determining the finger touch position according to a receiving signal of a second electrode corresponding to the finger touch coordinates in the second direction;

[0026] Wherein, N and M are both positive integers greater than or equal to 1.

[0027] In some embodiments, the processing unit provides a driving signal to the Nth first electrode and the N+1th first electrode in the first touch stage, and obtains the sensing reception signal of the Nth first electrode and the N+1th first electrode, including: in the first touch stage, controlling the first end of each first electrode to be suspended or connected to a reference level, controlling the second end of the Nth first electrode and the N+1th first electrode to receive the driving signal, and connecting two input ends of the differential amplifier of the processing unit to obtain a differential signal between the Nth first electrode and the N+1th first electrode;

[0028] The processing unit provides a driving signal to the Mth second electrode and the M+1th second electrode, and obtains the sensing receiving signal of the Mth second electrode and the M+1th second electrode, including: controlling the first end of each second electrode to be suspended or connected to a reference level, controlling the second end of the Mth second electrode and the M+1th second electrode to receive the driving signal, and connecting the two input ends of the differential amplifier of the processing unit to obtain the differential signal between the Mth second electrode and the M+1th second electrode.

[0029] In some embodiments, the processing unit is configured to:

[0030] In the second touch control stage, a first excitation signal is provided to the excitation coil to control the Pth first electrode and the Qth first electrode to form a coil loop, and after the first excitation signal stops, an electromagnetic induction receiving signal on the coil loop is obtained;

[0031] Control P to increase from 1 to obtain an electromagnetic induction receiving signal of the coil loop formed by all the first electrodes of the touch screen;

[0032] Determine the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction receiving signals of each coil loop;

[0033] Providing a first excitation signal to the excitation coil, controlling the Pth second electrode and the Qth second electrode to form a coil loop, and acquiring an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops;

[0034] Control P to increase from 1 to obtain an electromagnetic induction receiving signal of the coil loop formed by all the second electrodes of the touch screen;

[0035] Determine the electromagnetic pen touch coordinates in the second direction according to the electromagnetic induction receiving signals of each coil loop;

[0036] Wherein, P and Q are both positive integers, and QP is greater than or equal to 1.

[0037] In some embodiments, the processing unit provides the first excitation signal to the excitation coil in the second touch stage, controls the Pth first electrode and the Qth first electrode to form a coil loop, and obtains the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch stage, providing the first excitation signal to the excitation coil, controlling the first end of the Pth first electrode and the first end of the Qth first electrode to be short-circuited, connecting the second ends of the Pth first electrode and the Qth first electrode to the two input ends of the differential amplifier of the processing unit, so that the Pth first electrode and the Qth first electrode form a coil loop, and obtaining the differential signal between the Pth first electrode and the Qth first electrode after the excitation of the first excitation signal ends;

[0038] The processing unit provides a first excitation signal to the excitation coil, controls the P-th second electrode and the Q-th second electrode to form a coil loop, and obtains an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch stage, provides a first excitation signal to the excitation coil, controls the first end of the P-th second electrode and the first end of the Q-th second electrode to be short-circuited, connects the second ends of the P-th second electrode and the Q-th second electrode to the two input ends of the differential amplifier of the processing unit, so that the P-th second electrode and the Q-th second electrode form a coil loop, and obtains the differential signal between the P-th second electrode and the Q-th second electrode after the excitation of the first excitation signal ends.

[0039] In some embodiments, the processing unit is used to determine the signal frequency based on the electromagnetic induction receiving signal of any coil loop corresponding to the preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction, and determine the touch pressure data or button status data of the electromagnetic pen based on the signal frequency.

[0040] In some embodiments, the processing unit is also used to provide a second excitation signal to the excitation coil in the second touch stage to send an electromagnetic signal to the electromagnetic pen. After the second excitation signal ends, an electromagnetic induction receiving signal corresponding to any coil loop within a preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction is obtained, and touch pressure data or button status data is determined based on the signal frequency of the electromagnetic induction receiving signal.

[0041] In some embodiments, the processing unit determines the touch pressure sensing data or button status data according to the signal frequency of the electromagnetic induction received signal, including: determining the touch pressure sensing data according to the difference between the signal frequency of the electromagnetic induction received signal and a reference frequency; according to the signal frequency of the electromagnetic induction received signal being in a preset frequency range, determining the button status data corresponding to the preset frequency range as the current button status data of the electromagnetic pen.

[0042] In some embodiments, the processing unit is used to provide a first excitation signal to the excitation coil, so that the electromagnetic pen collects at least one of touch pressure sensing data, key state data, and electromagnetic pen identification data;

[0043] Providing a third excitation signal to the excitation coil to determine first data to be transmitted of the electromagnetic pen;

[0044] providing a fourth excitation signal to the excitation coil, so that the electromagnetic pen transmits the first data to be transmitted based on the fourth excitation signal;

[0045] Controlling the coil loop formed by the first electrode or the second electrode corresponding to the touch coordinates of the electromagnetic pen to receive the electromagnetic induction receiving signal generated based on the first data to be transmitted and analyzing it to obtain the first data to be transmitted;

[0046] The first data to be transmitted includes at least one of touch pressure sensing data, button status data and electromagnetic pen identification data.

[0047] In some embodiments, the processing unit is configured to:

[0048] In the second touch control stage, a fifth excitation signal is provided to the excitation coil, so that the capacitive stylus sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends;

[0049] Acquiring sensing reception signals of the Nth first electrode and the N+1th first electrode;

[0050] Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0051] Provide a fifth excitation signal to the excitation coil, so that the capacitive stylus sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends;

[0052] Acquire sensing reception signals of the Mth second electrode and the M+1th second electrode;

[0053] Control M to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and determine the capacitive pen touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode;

[0054] In some embodiments, the processing unit is used to: provide a sixth excitation signal to the excitation coil, so that the capacitive stylus transmits the second data to be transmitted after the excitation of the sixth excitation signal ends;

[0055] Acquire a sensing received signal based on the second data to be transmitted of the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or acquire a sensing received signal based on the second data to be transmitted of the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction;

[0056] At least one of the touch pressure sensing data, the button status data and the capacitive pen identification data of the capacitive pen is determined according to the sensing received signal.

[0057] In some embodiments, the first end of each of the first electrodes is electrically connected to the reference potential end of the processing unit through a first switch, electrically connected to the driving signal end of the processing unit through a second switch, electrically connected to the ground end of the processing unit through a third switch, electrically connected to the common potential end of the processing unit through a fourth switch, and electrically connected to the transceiver signal end of the processing unit through a fifth switch;

[0058] The second end of each of the first electrodes is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the driving signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, electrically connected to the common potential end of the processing unit through the fourth switch, and electrically connected to the transceiver signal end of the processing unit through the fifth switch;

[0059] The first end of each second electrode is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the driving signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, electrically connected to the common potential end of the processing unit through the fourth switch, and electrically connected to the transceiver signal end of the processing unit through the fifth switch;

[0060] The second end of each second electrode is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the drive signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, electrically connected to the common potential end of the processing unit through the fourth switch, and electrically connected to the transceiver signal end of the processing unit through the fifth switch.

[0061] In some embodiments, the first end of each of the first electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the second end of each of the first electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the first end of each of the second electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the second end of each of the second electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch;

[0062] The sixth switches connected to the same electrode terminal are connected in parallel with each other and with the fifth switch.

[0063] In a second aspect, the present disclosure further provides an electronic device, comprising a touch panel as described in any one of the first aspects.

[0064] In a third aspect, the present disclosure further provides a touch control system, comprising: a stylus and a touch control panel as described in any one of the first aspects;

[0065] The stylus pen includes an LC resonant circuit, and part or all of the electrical energy of the stylus pen when it is working is provided by the excitation coil of the touch panel.

[0066] In some embodiments, the stylus pen includes an electromagnetic pen and / or a capacitive pen;

[0067] Wherein, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen;

[0068] The active electromagnetic pen includes a battery and an LC resonance control circuit;

[0069] The passive electromagnetic pen includes an analog passive electromagnetic pen or a digital passive electromagnetic pen;

[0070] The analog passive electromagnetic pen does not contain an LC resonance control circuit and a pressure sensitivity value digitization circuit;

[0071] The digital passive electromagnetic pen comprises an LC resonance control circuit and a pressure sensitivity value digitization circuit;

[0072] The capacitive stylus comprises a receiving electrode, a sending electrode and a pressure-sensing value digitizing circuit.

[0073] In a fourth aspect, the present disclosure further provides a method for controlling a touch panel, wherein the touch panel is any one of the touch panels provided in the first aspect, and the method comprises a first touch stage and a second touch stage;

[0074] In the first touch control stage, a driving signal is provided to the first electrode and the second electrode, and finger touch control data is determined according to the induction receiving signals of the first electrode and the second electrode;

[0075] In the second touch control stage, an excitation signal is provided to the excitation coil, and after the excitation signal stops, touch control data of the stylus is determined according to the induction receiving signals of the first electrode and the second electrode.

[0076] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0077] Get the stylus type trigger signal;

[0078] Determining the capacitive pen touch mode based on the stylus type trigger signal, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the capacitive pen touch data according to the induction receiving signals of the first electrode and the second electrode;

[0079] Or based on the stylus type trigger signal, the electromagnetic pen touch mode is determined, in the second touch stage, an excitation signal is provided to the excitation coil, and after the excitation signal stops, the touch data of the electromagnetic pen is determined according to the induction receiving signals of the first electrode and the second electrode.

[0080] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0081] If no stylus type trigger signal is obtained within a preset time, an excitation signal is provided to the excitation coil in the second touch stage, and after the excitation signal stops, touch data of the stylus in the default mode is determined based on the induced receiving signals of the first electrode and the second electrode.

[0082] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0083] If no stylus type trigger signal is obtained within a preset time, in the second touch stage, an excitation signal is provided to the excitation coil in a time-sharing manner. After the excitation signal stops, the touch data of the capacitive pen and the electromagnetic pen are determined based on the induced receiving signals of the first electrode and the second electrode.

[0084] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0085] The touch panel provided by the present disclosure includes: a touch screen; a touch area of ​​the touch screen is provided with a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction; the first direction and the second direction intersect, so that the first electrode and the second electrode are insulated and cross-arranged; an excitation coil, the excitation coil is arranged around the touch area of ​​the touch screen; a processing unit, the processing unit is electrically connected to the first electrode, the second electrode and the excitation coil respectively. The processing unit is used to provide a driving signal to the first electrode and the second electrode in the first touch stage, and determine the finger touch data according to the induction receiving signal of the first electrode and the second electrode; provide an excitation signal to the excitation coil in the second touch stage, and after the excitation signal stops, determine the touch data of the stylus according to the induction receiving signal of the first electrode and the second electrode. As a result, the touch screen is equipped with a plurality of first electrodes and second electrodes arranged in an insulated cross-arrangement, and an excitation coil arranged around the touch area of ​​the touch screen. In different touch stages, the processing unit performs touch detection by time-sharing control of the first electrode and the second electrode. For example, when a finger touches the touch screen in the first touch stage, the processing unit provides a driving signal to the first electrode and the second electrode, and the first electrode and the second electrode generate an induction receiving signal, and the processing unit can determine the finger touch data according to the induction receiving signal; when a stylus touches the touch screen in the second touch stage, the processing unit provides an excitation signal to the excitation coil, and after the excitation signal stops, the resonance signal in the stylus begins to decay, and the first electrode and the second electrode generate an induction receiving signal, and the processing unit can determine the touch data of the stylus according to the induction receiving signal. The touch panel provided by the present disclosure can realize touch detection of fingers and different types of styluses by the touch panel through the same set of touch screens and processing units, thereby reducing the manufacturing cost of the touch screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0087] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0088] Figure 1 is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure;

[0089] Figure 2 A circuit diagram of a touch panel provided in an embodiment of the present disclosure;

[0090] Figure 3 A schematic diagram of the positioning principle of the electromagnetic pen in the first direction provided by the embodiment of the present disclosure;

[0091] Figure 4 A schematic diagram of the positioning principle of the electromagnetic pen in the second direction provided by an embodiment of the present disclosure;

[0092] Figure 5 A schematic diagram of switch connections between electrodes and a processing unit in a touch panel provided by an embodiment of the present disclosure;

[0093] Figure 6 A schematic diagram of switch connections between electrodes and a processing unit in another touch panel provided by an embodiment of the present disclosure;

[0094] Figure 7 A schematic diagram of a signal detection provided in this embodiment;

[0095] Figure 8 A schematic diagram of the structure of a touch control system provided by an embodiment of the present disclosure.

[0096] Among them, 10, touch screen; 11, excitation coil; 12, processing unit; 101, first electrode, 102, second electrode; 20; 210, differential amplifier; 211, amplification unit; 212, orthogonal modulation unit; 213, ADC analog-to-digital conversion unit; 214, data processing unit; VREF, reference potential terminal; PG, drive signal terminal; VSS, ground terminal; COM, common potential terminal; TR and TR1-TR4, transceiver signal terminals. DETAILED DESCRIPTION

[0097] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0098] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0099] The stylus includes capacitive pens and electromagnetic pens, among which the capacitive pens include active capacitive pens and passive capacitive pens. The detection system of the capacitive pen touch control has the same structure as the detection system of the finger touch control, and the same set of touch screens can be used. Only the touch chips of some touch devices are different. Therefore, it is widely used. However, taking the active capacitive pen as an example, its power consumption is relatively large and requires a battery. Therefore, it is necessary to have a charge and discharge management chip, a power meter chip, a matching wireless charging coil and chip (or a wired charging interface), a heat dissipation mechanism, battery safety, etc., as well as the multi-electrode pen tip, pen tip cover structure, active capacitive pen protocol chip, etc. required by the active capacitive pen itself, resulting in a complex structure, tight space, high assembly difficulty, and high cost of the capacitive pen. The electromagnetic pen has high precision, high pressure sensitivity level, good linearity, strong performance, and few components, making it an ideal stylus. However, the touch screen of the electromagnetic pen is different from that of the capacitive pen in structure, and the capacitive pen touch screen cannot be used to detect the touch operation of the electromagnetic pen. Therefore, another set of touch screens needs to be made, resulting in a significant increase in the cost of the display screen and a thicker structure.

[0100] In order to solve the above problems, the present disclosure provides a touch panel. Figure 1 A schematic diagram of the structure of a touch panel provided in an embodiment of the present disclosure is shown in FIG. Figure 1 As shown, the touch panel includes:

[0101] The touch screen 10; the touch area of ​​the touch screen 10 is provided with a plurality of first electrodes 101 arranged along a first direction and a plurality of second electrodes 102 arranged along a second direction; the first direction intersects with the second direction, so that the first electrodes 101 and the second electrodes 102 are insulated and cross-arranged.

[0102] The excitation coil 11 is disposed around the touch area of ​​the touch screen 10 .

[0103] The processing unit 12 is electrically connected to the first electrode 101 , the second electrode 102 and the excitation coil 11 , respectively.

[0104] The processing unit 12 is used to provide a driving signal to the first electrode 101 and the second electrode 102 in the first touch stage, and determine the finger touch data according to the induction receiving signals of the first electrode 101 and the second electrode 102; and provide an excitation signal to the excitation coil 11 in the second touch stage, and after the excitation signal stops, determine the touch data of the stylus according to the induction receiving signals of the first electrode 101 and the second electrode 102.

[0105] For example Figure 1 The touch area of ​​the touch screen 10 is provided with a plurality of first electrodes 101 arranged along a first direction and a plurality of second electrodes 102 arranged along a second direction, and the first direction and the second direction are arranged crosswise. The plurality of first electrodes 101 and the second electrodes 102 are electrically connected to the processing unit 12. Figure 1 As shown in the direction of the arrow, the horizontal direction is the first direction, the vertical direction is the second direction, a plurality of first electrodes 101 are arranged along the first direction, a plurality of second electrodes 102 are arranged along the second direction, and the first electrodes 101 and the second electrodes 102 are insulated and cross-arranged. The first electrodes 101 and the second electrodes 102 can be strip electrodes, or electrodes of other shapes such as diamonds or other patterns, which are not limited in the present disclosure. The number of first electrodes 101 and second electrodes 102 can be set according to the size of the touch screen and the electrode width. For example, for a 10-inch 4:3 touch screen, the number of electrodes in the second direction is 53, the number of electrodes in the first direction is 40, the width of each strip or column of electrodes is about 3.8 mm, and the length of each strip or column of electrodes is equal to or slightly larger than the length / width of the effective area of ​​the touch screen. The embodiments of the present disclosure also do not impose any restrictions on this. Figure 1 Only a small number of electrodes are shown to illustrate the technical solution of the embodiment of the present disclosure.

[0106] The touch panel also includes an excitation coil 11, which is arranged around the touch area of ​​the touch screen 10 and is electrically connected to the processing unit 12. The excitation coil 11 is a transmitting coil that transmits electromagnetic waves to the stylus, that is, the excitation coil 11 provides an excitation signal. When the excitation signal stops, the stylus resonates and the resonance amplitude slowly decreases. The excitation coil 11 can be formed by at least one circle of wire. Figure 1 The middle excitation coil 11 is formed of three turns of conductive wire and is electrically connected to the processing unit 12. The two ends of the excitation coil 11 are electrically connected to the P1 end and the P2 end of the processing unit 12, respectively.

[0107] The touch panel further includes a processing unit 12, which is used to provide a driving signal to the first electrode 101 and the second electrode 102 in the first touch stage, and determine the finger touch data according to the induction receiving signals of the first electrode 101 and the second electrode 102. In the second touch stage, an excitation signal is provided to the excitation coil 11, and after the excitation signal stops, the touch data of the stylus is determined according to the induction receiving signals of the first electrode 101 and the second electrode 102.

[0108] Exemplarily, in the first touch stage, the finger performs a touch operation on the touch screen, and the processing unit 12 provides a driving signal to the first electrode 101 and the second electrode 102. The electrode touched by the finger generates an induction receiving signal, and the processing unit 12 can determine the finger touch data, such as touch positioning or other touch instructions, based on the induction receiving signal. In the second touch stage, the stylus performs a touch operation on the touch screen, and the processing unit 12 provides an excitation signal to the excitation coil 11. After the excitation signal stops, the oscillation circuit in the stylus resonates and outputs a resonant signal to the touch screen. The first electrode 101 and the second electrode 102 generate an induction receiving signal based on the resonant signal of the stylus. The processing unit 12 can determine the touch data of the stylus, such as touch positioning or other touch instructions, based on the induction receiving signal.

[0109] Since the stylus includes an electromagnetic stylus and a capacitive stylus, the touch panel has different touch modes for touch detection depending on the type of stylus, so the second touch stage can be set to a capacitive pen touch mode or an electromagnetic pen touch mode according to actual usage. For example, by setting a physical button on the touch panel or sending a stylus type trigger signal to the processing unit 12 through software control, the touch panel can be selected to perform touch detection on the electromagnetic pen or on the capacitive pen.

[0110] In some optional embodiments, if the processing unit 12 does not receive a stylus type trigger signal, it can also be identified according to a preset default touch mode, such as a default capacitive pen touch mode. When no stylus type trigger signal is received, the current touch panel is in a capacitive pen touch mode. Optionally, the electromagnetic pen touch mode can also be set as the default touch mode, which is not limited in the embodiments of the present disclosure and is only used as an example.

[0111] In some embodiments, if the processing unit 12 does not receive a stylus type trigger signal and the touch panel is not set to a default mode, the processing unit can perform capacitive pen touch detection and electromagnetic pen touch detection in a time-sharing manner in the second touch stage.

[0112] In the disclosed embodiment, the touch screen is equipped with a plurality of insulated cross-arranged first electrodes and second electrodes, and an excitation coil arranged around the touch area of ​​the touch screen. The processing unit controls the first electrode, the second electrode and the excitation coil in the touch screen to perform different operations in different touch stages by time-sharing, so as to complete the detection of different touch types, thereby realizing the stylus writing and finger touch functions, reducing the overall thickness of the touch panel, and reducing the production cost. For example, when the touch screen is touched by a finger in the first touch stage, the processing unit provides a driving signal to the first electrode and the second electrode, and the first electrode and the second electrode generate an induction receiving signal, and the processing unit can determine the finger touch data according to the induction receiving signal; when the touch screen is touched by a stylus in the second touch stage, the processing unit provides an excitation signal to the excitation coil, and after the excitation signal stops, the oscillation circuit in the stylus resonates and outputs a resonance signal to the touch screen, and the first electrode and the second electrode generate an induction receiving signal, and the processing unit can determine the touch data of the stylus according to the induction receiving signal. The touch panel provided by the present disclosure can realize touch detection of fingers and different types of stylus pens by the touch panel through the same set of touch screen and processing unit, thereby reducing the manufacturing cost of the touch screen.

[0113] In some embodiments, both ends of the first electrode 101 are electrically connected to the processing unit 12 through wires; both ends of the second electrode 102 are electrically connected to the processing unit 12 through wires;

[0114] The distribution of each conductor satisfies any of the following:

[0115] Each wire is led out from one side of the touch area;

[0116] Each wire is led out from both sides of the touch area;

[0117] The wires are led out from three sides of the touch area;

[0118] The wires are led out from four sides of the touch area.

[0119] The touch area of ​​the touch screen 10 is provided with a plurality of first electrodes 101 arranged along a first direction and a plurality of second electrodes 102 arranged along a second direction. When a touch operation is performed on the touch screen, the electrodes at the corresponding positions of the touch will generate an induction receiving signal, and the processing unit 12 can determine specific touch data based on the induction receiving signal. Therefore, it is necessary to make both ends of the first electrode 101 electrically connected to the processing unit 12 through a wire, and both ends of the second electrode 102 electrically connected to the processing unit 12 through a wire, so as to accurately sense the touch data and improve the detection accuracy.

[0120] Further, when the first electrode 101 is electrically connected to the processing unit 12 through a wire, and when the second electrode 102 is electrically connected to the processing unit 12 through a wire, the distribution of each wire satisfies any one of the following:

[0121] by Figure 1 For example, the first electrode 101 extends along the second direction, the second electrode 102 extends along the first direction, the processing unit 12 is located below the touch area, and each wire is led out from the bottom and electrically connected to the processing unit 12, which can reduce the area of ​​the touch screen occupied by the wires. The embodiment of the present disclosure is only an example of each wire being led out from one side of the touch area, and other lead-out methods can be set according to actual needs.

[0122] In some embodiments, each wire is led out from one side of the touch area; the side from which each wire is led out is the lead-out side; part of the wires on the side opposite to the lead-out side are arranged and extended on the left side of the touch area, and part of the wires are arranged and extended on the right side of the touch area.

[0123] For example Figure 1 , 14 first electrodes are exemplarily arranged along the first direction, and 10 second electrodes are arranged along the second direction. For the convenience of description, Xi is used to represent the i-th first electrode, where i is the serial number of the first electrode; X- is used to represent the first end of the first electrode, and X+ is used to represent the second end of the first electrode; Yj is used to represent the j-th second electrode, where j is the serial number of the second electrode; Y- is used to represent the first end of the second electrode, and Y+ is used to represent the second end of the second electrode.

[0124] Each wire is led out from the bottom of the touch area, so the bottom of the touch area is the lead-out side of each wire. The side opposite to the lead-out side is the top of the touch area, and the wires on the top need to be led to the bottom lead-out side, so the wires on the top need to be bent and led out. Among them, the wire 103 partially connected to the X-end of the first electrode 101 is arranged and extended on the left side of the touch area, and is electrically connected to the processing unit 12; the wire 104 partially connected to the X-end of the first electrode 101 is arranged and extended on the right side of the touch area, and is electrically connected to the processing unit 12. The wire 106 connected to the Y+ end of the second electrode 102 is also arranged and extended on the left side of the touch area, and is electrically connected to the processing unit 1; the wire 107 connected to the Y-end of the second electrode 102 is arranged and extended on the right side of the touch area, and is electrically connected to the processing unit 12.

[0125] In some embodiments, the excitation waveform of the excitation coil is a sine wave or a square wave.

[0126] The excitation frequency of the excitation signal provided by the processing unit to the excitation coil is greater than 10 kHz

[0127] The excitation duration of the excitation signal provided by the processing unit to the excitation coil includes 1-100 microseconds, 100-800 microseconds, and 800-3000 microseconds.

[0128] When performing a touch operation, the processing unit provides an excitation signal to the excitation coil to enable the stylus to work. The excitation waveform of the excitation coil may be a sine wave or a square wave. In some optional embodiments, the excitation waveform may also be a waveform close to a sine wave or a square wave. During the touch process, the excitation frequency of the excitation signal is greater than 10 khz. The excitation duration of the excitation signal may also be different. Different excitation frequencies and excitation durations may transmit different control commands to the stylus, so that the stylus transmits corresponding touch data to the touch panel according to different control commands.

[0129] In some embodiments, the processing unit is configured to:

[0130] In the first touch control stage, a driving signal is provided to the Nth first electrode and the N+1th first electrode, and a sensing reception signal of the Nth first electrode and the N+1th first electrode is obtained;

[0131] Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the finger touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0132] Providing a driving signal to the Mth second electrode and the M+1th second electrode, and acquiring a sensing reception signal of the Mth second electrode and the M+1th second electrode;

[0133] Control M to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and determine the finger touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode;

[0134] Providing a driving signal to a first electrode corresponding to the finger touch coordinates in a first direction, and determining the finger touch position according to a receiving signal of a second electrode corresponding to the finger touch coordinates in a second direction;

[0135] Wherein, N and M are both positive integers greater than or equal to 1.

[0136] In different touch stages, the processing unit can control the first electrode and the second electrode to perform touch detection in a time-sharing manner, so as to realize touch detection of fingers and different types of stylus pens by the touch panel through the same touch screen and processing unit. For example, in the first touch stage, the processing unit can control the first electrode and the second electrode to perform finger touch detection. The specific principle of finger touch detection is described in detail below:

[0137] Continue to refer Figure 1The touch screen includes a plurality of first electrodes 101 and a plurality of second electrodes 102. In the first touch stage, the processing unit first controls the first electrodes 101 and the second electrodes 102 to perform self-capacitance detection respectively to determine the finger touch coordinates in the first direction and the finger touch coordinates in the second direction. Then the processing unit controls the first electrodes 101 and the second electrodes 102 to perform mutual capacitance detection to determine the accurate touch position coordinates of one or more fingers.

[0138] Specifically, when performing self-capacitance detection, the processing unit 12 provides a driving signal to the Nth first electrode 101 and the N+1th first electrode 101, and obtains the sensing reception signal of the Nth first electrode 101 and the N+1th first electrode 101. During the self-capacitance detection process, N starts from 1 and increases by 1 continuously to obtain the sensing reception signals between all the "adjacent first electrodes" of the touch panel.

[0139] For example, the processing unit provides a driving signal to the first first electrode 101 and the second first electrode 101, and obtains the sensing received signals of the first first electrode 101 and the second first electrode 101; the processing unit provides a driving signal to the second first electrode 101 and the third first electrode 101, and obtains the sensing received signals of the second first electrode 101 and the third first electrode 101; the processing unit provides a driving signal to the third first electrode 101 and the fourth first electrode 101, and obtains the sensing received signals of the third first electrode 101 and the fourth first electrode 101, and so on, until the driving signal is provided to the Nth first electrode 101 and the N+1th first electrode 101, and the sensing received signals of the Nth first electrode 101 and the N+1th first electrode 101 are obtained. Wherein N+1 is the number of first electrodes of the touch panel.

[0140] At this time, the sensing reception signals of all adjacent first electrodes 101 of the touch panel are obtained, and the processing unit can determine the finger touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode.

[0141] Similarly, the processing unit 12 provides a driving signal to the Mth second electrode 102 and the M+1th second electrode 102, and obtains the sensing reception signal of the Mth second electrode 102 and the M+1th second electrode 102. During the row self-capacitance detection process, M starts from 1 and increases by 1 continuously to obtain the sensing reception signals between all the "adjacent second electrodes" of the touch panel. For example, the processing unit provides a driving signal to the first second electrode 102 and the second second electrode 102, and obtains the sensing received signals of the first second electrode 102 and the second second electrode 102; the processing unit provides a driving signal to the second second electrode 102 and the third second electrode 102, and obtains the sensing received signals of the second second electrode 102 and the third second electrode 102; the processing unit provides a driving signal to the third second electrode 102 and the fourth second electrode 102, and obtains the sensing received signals of the third second electrode 102 and the fourth second electrode 102, and so on, until the driving signal is provided to the Mth second electrode 102 and the M+1th second electrode 102, and the sensing received signals of the Mth second electrode 102 and the M+1th second electrode 102 are obtained. Wherein M+1 is the number of second electrodes of the touch panel.

[0142] At this time, the sensing reception signals of all the adjacent second electrodes 102 of the touch panel are obtained, and the processing unit can determine the finger touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode.

[0143] At this point, the first electrode 101 and the second electrode 102 complete the self-capacitance detection, and the finger touch coordinates (horizontal coordinates) of one or more fingers touching the first direction and the finger touch coordinates (vertical coordinates) of the second direction can be obtained. Figure 1 As shown, X1 is used to represent the first first electrode, Xi is used to represent the i-th first electrode, and i is the serial number of the first electrode; Y1 is used to represent the first second electrode, Yj is used to represent the j-th second electrode, and j is the serial number of the second electrode. The horizontal coordinates obtained by self-capacitance detection include X5 and X9, and the vertical coordinates include Y2 and Y7. Then there are four combinations of position coordinates, such as (X5, Y2), (X5, Y7), (X9, Y2) and (X9, Y7), but the specific finger touch position coordinates cannot be determined at present. It is necessary to perform mutual capacitance detection between the first electrode 101 and the second electrode 102 to determine the accurate position coordinates.

[0144] The processing unit 12 provides a driving signal to the first electrode 101 corresponding to the finger touch coordinates in the first direction, detects the received signal of the second electrode 102 corresponding to the finger touch coordinates in the second direction, and determines the finger touch position according to the received signal. For example, a driving signal is provided to the first electrode 101 corresponding to X5, and the received signals of the second electrodes 102 corresponding to Y2 and Y7 are detected; and a driving signal is provided to the first electrode 101 corresponding to X9, and the received signals of the second electrodes 102 corresponding to Y2 and Y7 are detected. Finally, according to the received signals (X5, Y2), (X5, Y7), (X9, Y2) and (X9, Y7) of the second electrodes 102 corresponding to Y2 and Y7, which one is the finger touch coordinate position of multi-finger touch.

[0145] In some embodiments, the present application further provides a more refined touch detection, in which the processing unit provides a driving signal to the Nth first electrode and the N+1th first electrode in the first touch stage, and obtains the sensing reception signal of the Nth first electrode and the N+1th first electrode, including: in the first touch stage, controlling the first end of each first electrode to be suspended or connected to a reference level, controlling the second end of the Nth first electrode and the N+1th first electrode to receive the driving signal, and connecting the two input ends of the differential amplifier of the processing unit to obtain the differential signal between the Nth first electrode and the N+1th first electrode;

[0146] The processing unit provides a driving signal to the Mth second electrode and the M+1th second electrode, and obtains the sensing receiving signal of the Mth second electrode and the M+1th second electrode, including: controlling the first end of each second electrode to be suspended or connected to a reference level, controlling the second end of the Mth second electrode and the M+1th second electrode to receive the driving signal, and connecting the two input ends of the differential amplifier of the processing unit to obtain the differential signal between the Mth second electrode and the M+1th second electrode.

[0147] Exemplarily, the sensing received signal provided in the embodiment of the present disclosure is a differential signal, and the finger touch position is determined by the differential signal. Figure 1 , the first end of the first electrode 101 is the X-end ( Figure 1 The first electrode 101 is located above the second end, and the second end is the X+ end ( Figure 1 The first end of the second electrode 102 is the Y-end ( Figure 1 The second end is the Y+ end ( Figure 1 left side of the second electrode 102).

[0148] Take the touch panel including 14 first electrodes and 10 second electrodes as an example for introduction. When self-capacitance detection is performed, X1-...X14-, Y1-...X10- are suspended, and X1+X2+, X2+X3+, X3+X4+, X4+X5+,...X11+X12+, X12+X13+, X13+X14+, Y1+Y2+, Y2+Y3+, Y3+Y4+, Y4+Y5+,...Y8+Y9+, Y9+Y10+ are differentially performed one by one, re-amplified, orthogonally modulated, integrated, ADC analog-to-digital conversion, etc. When two-finger mutual capacitance detection is performed, if the previous self-capacitance detection determines that the X5, X9, Y2, and Y7 electrodes are obviously touched by fingers. First, the processing unit controls to provide a driving signal to X5+, X5- is grounded to VSS, Y2+Y3+, Y7+Y8+ are paired for subsequent differential amplification, re-amplification, orthogonal modulation, integration, ADC analog-to-digital conversion, etc., and the other electrode ends are connected to the reference level VREF, for example, it is obtained that there is a finger touching the intersection of the X5 electrode and the Y2 electrode, and there is no finger touching the intersection of the X5 electrode and the Y7 electrode. Then, in the same way as above, a driving signal is provided to X9+, X9- is grounded to VSS, Y2+Y3+, Y7+Y8+ are paired for subsequent differential amplification, re-amplification, orthogonal modulation, integration, ADC analog-to-digital conversion, etc., and the other electrode ends are connected to the reference level VREF, for example, it is obtained that there is a finger touching the intersection of the X9 electrode and the Y7 electrode, and there is no finger touching the intersection of the X9 electrode and the Y2 electrode, and finally two finger touch positions are accurately obtained, one close to (X5, Y2) and the other close to (X9, Y7).

[0149] Figure 2 This is a circuit diagram of a touch panel provided by an embodiment of the present disclosure. In the first touch stage, the first end of the first electrode is controlled to be suspended or connected to a reference level, and the second end of the Nth first electrode and the N+1th first electrode is controlled to receive a driving signal. Figure 2Take the example of the control of the connection channel of the first electrode and the second electrode by the processing unit. The second end 201 of the Nth first electrode receives the driving signal PG through the first resistor R1, and the second end 202 of the N+1th first electrode receives the driving signal PG through the second resistor R2. The second end 201 of the Nth first electrode is connected to the positive input end of the differential amplifier 210 of the processing unit through the third resistor R3, and the second end 202 of the N+1th first electrode is connected to the negative input end of the differential amplifier 210 of the processing unit through the fourth resistor R4 to obtain the differential signal between the Nth first electrode and the N+1th first electrode. The processing unit controls N to increase from 1, and N is a positive integer greater than or equal to 1. The differential signals of all adjacent first electrodes of the touch panel are obtained, wherein the differential signal corresponding to the position touched by the finger is different from the differential signal corresponding to the position not touched by the finger, and the finger touch coordinates in the first direction are determined according to the differential signals of each adjacent first electrode, for example, the finger touch coordinates of one or more fingers touching in the first direction can be determined.

[0150] Similarly, the first end of the second electrode is controlled to be suspended or connected to the reference level, and the second end of the Mth second electrode and the M+1th second electrode is controlled to receive the driving signal through the resistor. The second end of the Mth second electrode receives the driving signal PG through the first resistor, and the second end of the M+1th second electrode receives the driving signal PG through the second resistor. The second end of the Mth second electrode is connected to the positive input end of the differential amplifier of the processing unit through the third resistor, and the second end of the M+1th second electrode is connected to the negative input end of the differential amplifier of the processing unit through the fourth resistor to obtain the differential signal between the Mth second electrode and the M+1th second electrode. The processing unit controls M to increase from 1, and M is a positive integer greater than or equal to 1. The differential signals of all adjacent second electrodes of the touch panel are obtained, wherein the differential signal corresponding to the position touched by the finger is different from the differential signal corresponding to the position not touched by the finger, and the finger touch coordinates in the first direction are determined according to the differential signals of each adjacent second electrode, for example, the finger touch coordinates of one or more fingers touching in the second direction can be determined.

[0151] Alternatively, if Figure 2 As shown, the non-inverting input terminal of the differential amplifier 210 is also electrically connected to the reference voltage VREF through the fifth resistor R5, and the output terminal of the differential amplifier 210 is electrically connected to the amplification unit 211, the orthogonal modulation unit 212, the ADC analog-to-digital conversion unit 213 and the data processing unit 214 in sequence, and the acquired differential signal is amplified, orthogonally modulated, analog-to-digital converted and other processing is performed, so as to obtain accurate touch data based on the differential signal calculation.

[0152] In some embodiments, the processing unit is configured to:

[0153] In the second touch control stage, a first excitation signal is provided to the excitation coil to control the Pth first electrode and the Qth first electrode to form a coil loop, and after the first excitation signal stops, an electromagnetic induction receiving signal on the coil loop is obtained;

[0154] Control P to increase from 1 to obtain an electromagnetic induction receiving signal of the coil loop formed by all the first electrodes of the touch screen;

[0155] Determine the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction receiving signals of each coil loop;

[0156] Provide a first excitation signal to the excitation coil, control the Pth second electrode and the Qth second electrode to form a coil loop, and obtain an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops;

[0157] Control P to increase from 1 to obtain an electromagnetic induction receiving signal of the coil loop formed by all the second electrodes of the touch screen;

[0158] Determine the electromagnetic pen touch coordinates in the second direction according to the electromagnetic induction receiving signals of each coil loop;

[0159] Wherein, P and Q are both positive integers, and QP is greater than or equal to 1.

[0160] The touch panel can perform time-division multiplexing of the first electrode and the second electrode in different touch stages so that the processing unit can determine different touch data. In the second touch stage, the embodiment of the disclosure can enable the processing unit to determine the touch data of the electromagnetic pen. The touch data of the electromagnetic pen in the embodiment of the disclosure includes the touch positioning of the electromagnetic pen, which determines the specific position of the electromagnetic pen touching on the touch panel.

[0161] Figure 3 A schematic diagram of the positioning principle of the electromagnetic pen in the first direction provided by the embodiment of the present disclosure, combined with Figure 1 and Figure 3 As shown, the touch screen includes a plurality of first electrodes 101. Figure 3 The first electrode 101 and the processing unit 12 are shown as examples. In the second touch control stage, the processing unit 12 sends an excitation coil ( Figure 3 (not shown) provides a first excitation signal to control the Pth first electrode 101 and the Qth first electrode 101 to form a coil loop, and obtains the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops. That is, the Pth first electrode 101 and the Qth first electrode 101 are at least adjacent electrodes, and some electrodes can also be spaced apart, but the number of spaced electrodes should not be too large. Too many spaced electrodes will result in a too large detection range, and the electromagnetic pen touch position cannot be accurately determined. For example, Figure 4Where P is 1, Q is 4, the first first electrode 101 and the fourth first electrode 101 form a coil loop. After the first excitation signal stops, if there is an electromagnetic pen above the touch screen, the resonant circuit in the electromagnetic pen resonates, and the first first electrode 101 and the fourth first electrode 101 form a coil loop to generate an electromagnetic induction receiving signal according to the electromagnetic pen resonant signal.

[0162] P is controlled to increase from 1 to obtain the electromagnetic induction receiving signal of the coil loop formed by all the first electrodes 101 of the touch screen. Since the electromagnetic induction receiving signal corresponding to the position touched by the electromagnetic pen is different from the electromagnetic induction receiving signal corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the first direction are determined according to the electromagnetic induction receiving signals of each coil loop.

[0163] Similarly, Figure 4 A schematic diagram of the positioning principle of the electromagnetic pen in the second direction provided by the embodiment of the present disclosure, combined with Figure 1 and Figure 4 As shown, the touch screen includes a plurality of second electrodes 102. Figure 5 The second electrode 102 and the processing unit 12 are shown as examples. In the second touch control stage, the processing unit 12 sends an excitation coil ( Figure 4 The first excitation signal is provided to control the P-th second electrode 102 and the Q-th second electrode 102 to form a coil loop, and after the first excitation signal stops, the electromagnetic induction receiving signal on the coil loop is obtained. That is, the P-th second electrode 102 and the Q-th second electrode 102 are at least adjacent electrodes, and some electrodes may be spaced apart, but the number of spaced electrodes should not be too many. Too many spaced electrodes will result in a too large detection range, and the electromagnetic pen touch position cannot be accurately determined. For example, the excitation coil provides the first excitation signal, and the electromagnetic pen obtains excitation energy and is stimulated to oscillate. Figure 5 Where P is 1, Q is 4, the first second electrode 102 and the fourth second electrode 102 form a coil loop. After the first excitation signal stops, if there is an electromagnetic pen above the touch screen, the resonant circuit in the electromagnetic pen resonates and forms a coil loop with the first second electrode 102 and the fourth second electrode 102, which can generate an electromagnetic induction receiving signal according to the electromagnetic pen resonance signal.

[0164] P is controlled to increase from 1 to obtain the electromagnetic induction receiving signal of the coil loop formed by all the second electrodes 102 of the touch screen. Since the electromagnetic induction receiving signal corresponding to the position touched by the electromagnetic pen is different from the electromagnetic induction receiving signal corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the second direction are determined according to the electromagnetic induction receiving signals of each coil loop.

[0165] In some embodiments, the processing unit provides the first excitation signal to the excitation coil in the second touch stage, controls the Pth first electrode and the Qth first electrode to form a coil loop, and obtains the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch stage, providing the first excitation signal to the excitation coil, controlling the first end of the Pth first electrode and the first end of the Qth first electrode to be short-circuited, connecting the second ends of the Pth first electrode and the Qth first electrode to the two input ends of the differential amplifier of the processing unit, so that the Pth first electrode and the Qth first electrode form a coil loop, and obtaining the differential signal between the Pth first electrode and the Qth first electrode after the excitation of the first excitation signal ends;

[0166] The processing unit provides a first excitation signal to the excitation coil, controls the P-th second electrode and the Q-th second electrode to form a coil loop, and obtains an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch stage, provides a first excitation signal to the excitation coil, controls the first end of the P-th second electrode and the first end of the Q-th second electrode to be short-circuited, connects the second ends of the P-th second electrode and the Q-th second electrode to the two input ends of the differential amplifier of the processing unit, so that the P-th second electrode and the Q-th second electrode form a coil loop, and obtains the differential signal between the P-th second electrode and the Q-th second electrode after the excitation of the first excitation signal ends.

[0167] Exemplarily, the electromagnetic induction receiving signal provided in the embodiment of the present disclosure is a differential signal, and the electromagnetic pen touch position is determined by the differential signal. Figure 1 and Figure 3 For example, in the second touch control stage, the processing unit 12 provides a first excitation signal to the excitation coil, controls the first end of the Pth first electrode 101 and the first end of the Qth first electrode 101 to be short-circuited, and controls the second end of the Pth first electrode 101 and the second end of the Qth first electrode 101 to be connected to the two input ends of the differential amplifier of the processing unit 12 through a resistor. The second end of the Pth first electrode 101 can be connected to the non-inverting input end of the differential amplifier of the processing unit through a resistor, and the second end of the Qth first electrode 101 is connected to the inverting input end of the differential amplifier of the processing unit through a resistor, so that the first end of the Pth first electrode 101 and the first end of the Qth first electrode 101 are short-circuited to form a coil loop. After the excitation of the first excitation signal ends, the resonant circuit in the electromagnetic pen resonates, and the coil loop generates an electromagnetic induction receiving signal based on the resonant signal of the electromagnetic pen, so that the processing unit can obtain the differential signal between the Pth first electrode 101 and the Qth first electrode 101. Since the electromagnetic induction receiving signal corresponding to the position touched by the electromagnetic pen is different from the electromagnetic induction receiving signal corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the first direction can be determined according to the electromagnetic induction receiving signals of each coil loop.

[0168] Similarly, continue to refer to Figure 1 and Figure 4 For example, in the second touch control stage, the processing unit 12 provides a first excitation signal to the excitation coil 11, controls the first end of the P-th second electrode 102 and the first end of the Q-th second electrode 102 to be short-circuited, and controls the second end of the P-th second electrode 102 and the second end of the Q-th second electrode 102 to be connected to the two input ends of the differential amplifier of the processing unit 12 through a resistor. The second end of the P-th second electrode 102 is connected to the non-inverting input end of the differential amplifier of the processing unit through a resistor, and the second end of the Q-th second electrode 102 is connected to the inverting input end of the differential amplifier of the processing unit through a resistor, so that the first end of the P-th second electrode 102 and the first end of the Q-th second electrode 102 are short-circuited to form a coil loop. After the excitation of the first excitation signal ends, the resonant circuit in the electromagnetic pen resonates, and the coil loop generates an electromagnetic induction receiving signal based on the resonant signal of the electromagnetic pen, so that the processing unit can obtain the differential signal between the P-th second electrode 102 and the Q-th second electrode 102. Since the electromagnetic induction receiving signal corresponding to the position touched by the electromagnetic pen is different from the electromagnetic induction receiving signal corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the second direction are determined according to the electromagnetic induction receiving signals of each coil loop.

[0169] Since the closer the electromagnetic pen is to the coil loop, the stronger the electromagnetic induction receiving signal of the coil loop is, the electromagnetic pen touch coordinates in the first direction and the electromagnetic pen touch coordinates in the second direction can be obtained, thereby determining the accurate touch position of the electromagnetic pen.

[0170] The duration of the first excitation signal can be set according to actual needs, but during the detection process, the duration of the first excitation signal can be fixed to ensure energy balance between the transmitted and received signals.

[0171] The following is an example of electromagnetic pen touch positioning:

[0172] In the first step, the processing unit provides an excitation signal to the excitation coil, the electromagnetic pen obtains excitation energy, oscillates under stimulation, the excitation coil stops exciting, and the electromagnetic pen resonates (the resonance frequency depends on the LC value in the pen, and the resonance amplitude slowly decreases). In the second step, the second end (X1+) of the first first electrode and the second end (X4+) of the fourth first electrode, the second end (Y1+) of the first second electrode and the second end (Y4+) of the fourth second electrode are paired for subsequent differential amplification, re-amplification, orthogonal modulation, integration, ADC analog-to-digital conversion, etc. In addition, the first end (X1-) of the first first electrode and the first end (X4-) of the fourth first electrode are short-circuited, the first end (Y1-) of the first second electrode and the first end (Y4-) of the fourth second electrode are short-circuited, and the terminals of the remaining electrodes are left floating. Repeat the first step, replace the coil in the second step, the second end (X2+) of the second first electrode and the second end (X5+) of the fifth first electrode, the second end (Y2+) of the second second electrode and the second end (Y5+) of the fifth second electrode are paired for subsequent differential amplification, re-amplification, orthogonal modulation, integration, ADC analog-to-digital conversion, etc., the first end (X2-) of the second first electrode and the first end (X5-) of the fifth first electrode are short-circuited, the first end (Y2-) of the second second electrode and the first end (Y5-) of the fifth second electrode are short-circuited, and the rest are left hanging. ...until the coil with the strongest signal in the first direction and the coil with the strongest signal in the second direction are found; the third step is to obtain the coordinates of the stylus according to the normal distribution of the coil signal energy.

[0173] In some embodiments, the processing unit is used to determine the signal frequency based on the electromagnetic induction receiving signal of any coil loop corresponding to the preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction, and determine the touch pressure data or button status data of the electromagnetic pen based on the signal frequency.

[0174] The disclosed embodiment may also determine the touch pressure sensing data or key status data of the electromagnetic pen based on the electromagnetic induction receiving signal.

[0175] The following explanation is given using a simulated passive electromagnetic pen as an example. The simulated passive electromagnetic pen includes an LC resonant circuit, a non-resonant control circuit, and a power supply. When the tip of the simulated passive electromagnetic pen is pressed, the L or C value of the simulated passive electromagnetic pen will be continuously changed, so the pressure change can cause the LC resonant frequency to change. When the button of the simulated passive electromagnetic pen is pressed, the C value of the simulated passive electromagnetic pen will also change (for example, by means of a parallel capacitor), so pressing the button can cause the LC resonant frequency to change. When using a simulated passive electromagnetic pen for touch control, when the first excitation signal stops, the LC resonant circuit of the electromagnetic pen resonates, and the coil loop generates an electromagnetic induction receiving signal based on the resonant signal of the electromagnetic pen. The processing unit can determine the touch pressure data or button status data of the electromagnetic pen according to the signal frequency.

[0176] Among them, any corresponding coil loop within the preset distance range can be set to use the coil loop with the strongest signal during electromagnetic pen touch positioning, or several coil loops with stronger signals adjacent to the above coil loop can be selected.

[0177] Since the electromagnetic induction receiving signal of the coil loop can be obtained during the positioning process of the stylus pen, the signal frequency of the electromagnetic induction receiving signal of the coil loop obtained during the positioning process can be directly used to determine the touch pressure sensing data or key status data of the electromagnetic pen. In some embodiments, the touch pressure sensing data or key status data can also be transmitted by giving an excitation signal again through the excitation coil.

[0178] For example, in some embodiments, the processing unit is also used to provide a second excitation signal to the excitation coil in the second touch stage to send an electromagnetic signal to the electromagnetic pen. After the second excitation signal ends, an electromagnetic induction receiving signal corresponding to any coil loop within a preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction is obtained, and the touch pressure data or button status data is determined according to the signal frequency of the electromagnetic induction receiving signal.

[0179] In the disclosed embodiment, after the electromagnetic touch position is determined, a second excitation signal is provided to the excitation coil to send an electromagnetic signal to the electromagnetic pen. After the second excitation signal ends, the LC resonant circuit of the electromagnetic pen resonates, and the processing unit obtains the electromagnetic induction receiving signal of any coil loop corresponding to the preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction, determines the signal frequency of the electromagnetic induction receiving signal of the coil loop based on the second excitation signal, and determines the touch pressure data or key state data of the electromagnetic pen.

[0180] In some embodiments, the processing unit determines the touch pressure sensing data or the key state data according to the signal frequency of the electromagnetic induction receiving signal, including: determining the touch pressure sensing data according to the difference between the signal frequency of the electromagnetic induction receiving signal and the reference frequency;

[0181] According to the signal frequency of the electromagnetic induction receiving signal being in a preset frequency interval, the key state data corresponding to the preset frequency interval is determined as the current key state data of the electromagnetic pen.

[0182] When the pressure of the pen tip is different, the inductance or capacitance of the electromagnetic pen's LC resonant circuit will change, causing the frequency of the LC resonant circuit resonant signal to change, which affects the signal frequency of the electromagnetic induction receiving signal of the coil loop. The coil loop is pre-set with a reference frequency, which simulates the frequency of the LC resonant circuit resonant signal when the passive electromagnetic pen is not under force. The signal frequency of the electromagnetic induction receiving signal is compared with the reference frequency. The larger the frequency difference, the stronger the pressure sense, thereby obtaining touch pressure sense data.

[0183] When a button on a simulated passive electromagnetic pen is pressed, the capacitance value of the LC resonant circuit in the electromagnetic pen will also change. For example, when a button is pressed, a capacitor is connected in parallel to the resonant circuit, and the capacitance value of the LC resonant circuit changes, causing the frequency of the resonant signal of the LC resonant circuit to change, which will cause the signal frequency of the electromagnetic induction receiving signal of the coil loop to change. The processing unit determines the signal frequency according to the electromagnetic induction receiving signal of any coil loop corresponding to the preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction, and determines the button state data of the electromagnetic pen according to the signal frequency, for example, using "the receiving signal frequency is in a preset frequency range" to obtain one or more button states of the simulated passive electromagnetic pen.

[0184] In some embodiments, the processing unit is used to provide a first excitation signal to the excitation coil, so that the electromagnetic pen collects at least one of touch pressure sensing data, key state data, and electromagnetic pen identification data;

[0185] Providing a third excitation signal to the excitation coil to determine first data to be transmitted by the electromagnetic pen;

[0186] providing a fourth excitation signal to the excitation coil, so that the electromagnetic pen transmits the first data to be transmitted based on the fourth excitation signal;

[0187] Control the coil loop formed by the first electrode or the second electrode corresponding to the touch coordinates of the electromagnetic pen to receive the electromagnetic induction receiving signal formed based on the first data to be transmitted and analyze it to obtain the first data to be transmitted;

[0188] The first data to be transmitted includes at least one of touch pressure sensing data, button status data and electromagnetic pen identification data.

[0189] In the embodiments disclosed herein, a digital passive electromagnetic pen is used as an example for explanation. Compared with an analog passive electromagnetic pen, a digital passive electromagnetic pen has a different circuit structure and data transmission. For example, a digital passive electromagnetic pen includes a resonant circuit, a resonant control circuit, and a pressure sense value digitization circuit.

[0190] A digital passive electromagnetic pen is used for touch control, and the excitation coil provides a first excitation signal. The resonant circuit, the resonant control circuit, and the pressure-sensitive digital circuit in the electromagnetic pen work, and the first data to be transmitted can be collected. The first data to be transmitted includes at least one of touch pressure-sensitive data, key state data, and electromagnetic pen identification data (such as electromagnetic pen ID, type, etc.). Among them, the first excitation signal can be an excitation signal for determining the touch position of the electromagnetic pen in the above embodiment, or it can be an excitation signal sent again. The present disclosure does not limit this. The duration of this excitation signal can be longer, and the first data to be transmitted can be collected during the excitation process.

[0191] Then the processing unit provides a third excitation signal to the excitation coil to determine the first data to be transmitted of the electromagnetic pen. The third excitation signal can be obtained by combining excitation signals of multiple durations, thereby corresponding to different first data to be transmitted. For example, if the third excitation signal includes a short excitation and a medium excitation, it means that the first data to be transmitted includes "touch pressure sensing data" and "button status data"; or if the third excitation signal includes a short excitation, a medium excitation and a long excitation, the first data to be transmitted includes "touch pressure sensing data", "button status data" and "electromagnetic pen identification data", etc. Among them, the short excitation is an excitation signal with a shorter duration, the medium excitation is an excitation signal with a medium duration, and the long excitation duration is an excitation signal with an actual longer duration.

[0192] After determining the first data to be transmitted, the processing unit provides a fourth excitation signal to the excitation coil, so that the electromagnetic pen transmits the first data to be transmitted based on the fourth excitation signal. The fourth excitation signal can be a short excitation, and the electromagnetic pen transmits the first data to be transmitted that is prepared to be transmitted to the touch panel through the fourth excitation signal. Since it is a digital passive electromagnetic pen, during the transmission of the first data to be transmitted, one bit of data can be transmitted each time a fourth excitation signal is received, or multiple bits of data can be sent to the touch panel after a fourth excitation signal is received.

[0193] Among them, the data transmission channel is a coil loop formed by the corresponding first electrode or second electrode when detecting the touch coordinates of the electromagnetic pen. Exemplarily, the coil loop formed by the first electrode means that the Pth first electrode and the Qth first electrode form a coil loop; the coil loop formed by the second electrode means that the Pth second electrode and the Qth second electrode form a coil loop. This coil loop is controlled to receive the electromagnetic induction receiving signal formed based on the first data to be transmitted and parse to obtain the first data to be transmitted.

[0194] In some embodiments, the processing unit is configured to:

[0195] In the second touch control stage, a fifth excitation signal is provided to the excitation coil, so that the capacitive stylus sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends;

[0196] Acquiring sensing reception signals of the Nth first electrode and the N+1th first electrode;

[0197] Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0198] providing a fifth excitation signal to the excitation coil, so that the capacitive stylus sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends;

[0199] Acquire sensing reception signals of the Mth second electrode and the M+1th second electrode;

[0200] M is controlled to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and the capacitive pen touch coordinates in the second direction are determined according to the sensing reception signals of each adjacent second electrode.

[0201] Continue to refer Figure 1 In the second touch stage, the capacitive pen performs a touch operation on the touch screen, wherein the capacitive pen includes a resonant circuit. The processing unit 12 provides a fifth excitation signal to the excitation coil 11. After the excitation of the fifth excitation signal ends, the capacitive pen obtains part of the stored energy or all of the stored energy from the fifth excitation signal, and the capacitive pen can send a feedback signal to the touch panel according to a preset communication protocol. After the fifth excitation signal stops, the resonant circuit in the capacitive pen resonates and outputs a resonant signal to the touch screen. The processing unit 12 obtains the sensing reception signals of the Nth first electrode 101 and the N+1th first electrode 101. Control N to increase from 1, N is a positive integer greater than or equal to 1, to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode. For example, the sensing reception signals of the first first electrode 101 and the second first electrode 101 are obtained, the sensing reception signals of the second first electrode 101 and the third first electrode 101 are obtained, the sensing reception signals of the third first electrode 101 and the fourth first electrode 101 are obtained, and so on, until the sensing reception signals of the Nth first electrode 101 and the N+1th first electrode 101 are obtained. At this time, the sensing reception signals of all adjacent first electrodes of the touch screen are obtained. At this time, the sensing reception signals of all adjacent first electrodes of the touch screen are obtained. Wherein, N+1 is the number of first electrodes.

[0202] Because the closer the distance between the electrode and the capacitive pen is, the stronger the sensing received signal is, therefore, the capacitive pen touch coordinate X in the first direction can be determined by acquiring the strength of the sensing received signals of each adjacent first electrode.

[0203] Similarly, when determining the capacitive pen touch coordinate Y in the second direction, the processing unit 12 provides the fifth excitation signal to the excitation coil 11. After the excitation of the fifth excitation signal ends, the capacitive pen obtains part of the stored energy or all of the stored energy from the fifth excitation signal, which is equivalent to charging the capacitive pen, and the capacitive pen sends a feedback signal according to the fifth excitation signal. After the fifth excitation signal stops, the LC resonant circuit in the capacitive pen resonates and outputs a resonant signal to the touch screen. Therefore, the capacitive pen can send a sensing reception signal to the electrode of the touch screen according to the communication protocol, and further the processing unit 12 obtains the sensing reception signal of the Mth second electrode 102 and the M+1th second electrode 102. Control M to increase from 1, M is a positive integer greater than or equal to 1, so as to obtain the sensing reception signal of all adjacent second electrodes 102 of the touch screen; and determine the capacitive pen touch coordinates in the second direction according to the sensing reception signal of each adjacent second electrode 102. For example, the sensing reception signals of the first second electrode 102 and the second second electrode 102 are obtained, the sensing reception signals of the second second electrode 102 and the third second electrode 102 are obtained, the sensing reception signals of the third second electrode 102 and the fourth second electrode 102 are obtained, and so on, until the sensing reception signals of the Mth second electrode 102 and the M+1th second electrode 102 are obtained. At this time, the sensing reception signals of all adjacent second electrodes of the touch screen are obtained. Among them, M+1 is the number of second electrodes. Therefore, the capacitive pen touch coordinate Y in the second direction can be determined by obtaining the strength of the sensing reception signals of each adjacent second electrode.

[0204] In summary, the embodiments of the present disclosure can determine the accurate touch position coordinates of the capacitive pen according to the acquired capacitive pen touch coordinates X and Y.

[0205] Exemplarily, the sensing received signal provided in the embodiment of the present disclosure is a differential signal, and the touch position of the capacitive stylus is determined by the differential signal. Figure 1 , the first end of the first electrode 101 is the X-end (above the first electrode 101), and the second end is the X+end (below the first electrode 101). In the first touch control stage, the first end of the first electrode 101 is controlled to be suspended or connected to a reference level, and the second ends of the Nth first electrode 101 and the N+1th first electrode 101 are controlled to receive two input ends of a differential amplifier connected to a processing unit through a resistor. For example, the second end of the Nth first electrode 101 is connected to the non-inverting input end of the differential amplifier of the processing unit through a resistor, and the second end of the N+1th first electrode 101 is connected to the inverting input end of the differential amplifier of the processing unit through a resistor to obtain a differential signal between the Nth first electrode 101 and the N+1th first electrode 101.

[0206] Similarly, the first end of the second electrode 102 is the Y-end (the right side of the second electrode 102), and the second end is the Y+end (the left side of the second electrode 102). In the second touch control stage, the first end of the second electrode 102 is controlled to be suspended or connected to the reference level, and the second ends of the Mth second electrode 102 and the M+1th second electrode 102 are controlled to be connected to the two input ends of the differential amplifier of the processing unit through resistors. For example, the second end of the Mth second electrode 102 is connected to the non-inverting input end of the differential amplifier of the processing unit through a resistor, and the second end of the M+1th second electrode 102 is connected to the inverting input end of the differential amplifier of the processing unit through a resistor to obtain the differential signal between the Mth second electrode 102 and the M+1th first electrode 101.

[0207] Alternatively, if Figure 2 As shown, the non-inverting input terminal of the differential amplifier 210 is also electrically connected to the reference potential terminal VREF through the fifth resistor R5, and the output terminal of the differential amplifier 210 is electrically connected to the amplification unit 211, the orthogonal modulation unit 212, the ADC analog-to-digital conversion unit 213 and the data processing unit 214 in sequence, and the acquired differential signal is amplified, orthogonally modulated, analog-to-digital converted and other processing is performed, so as to obtain accurate touch data based on the differential signal calculation. In the disclosed embodiment, the touch data of the capacitive pen is the touch position coordinates.

[0208] In some embodiments, the processing unit is used to: provide a sixth excitation signal to the excitation coil, so that the capacitive stylus transmits the second data to be transmitted after the excitation of the sixth excitation signal ends;

[0209] Acquire a sensing reception signal based on the second data to be transmitted of the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or acquire a sensing reception signal based on the second data to be transmitted of the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction;

[0210] At least one of the touch pressure sensing data, the button status data and the capacitive pen identification data of the capacitive pen is determined according to the sensing received signal analysis.

[0211] In addition to determining the touch position of the capacitive pen based on the sensed received signal, the embodiment of the present disclosure can also parse other touch data of the capacitive pen, such as second data to be transmitted, which includes at least one of the touch pressure data, button status data and capacitive pen identification data of the capacitive pen.

[0212] The processing unit provides a sixth excitation signal to the excitation coil, and the capacitive pen completes partial or full energy storage through the sixth excitation signal, and can transmit the second data to be transmitted after the sixth excitation signal ends. The touch panel can receive the second data to be transmitted transmitted by the capacitive pen through the corresponding electrode channel obtained when obtaining the touch position of the capacitive pen.

[0213] Therefore, the processing unit obtains the sensing reception signal of the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction based on the second data to be transmitted, or obtains the sensing reception signal of the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction based on the second data to be transmitted. According to the sensing reception signal, the specific touch data transmitted by the capacitive pen can be parsed, such as at least one of the touch pressure data, key status data and capacitive pen identification data of the capacitive pen.

[0214] In some embodiments, Figure 5 A schematic diagram of switch connections between electrodes and a processing unit in a touch panel provided by an embodiment of the present disclosure is shown in FIG. Figure 5 As shown, the first end of each first electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K201, is electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, is electrically connected to the ground terminal VSS of the processing unit through the third switch K203, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and is electrically connected to the transceiver signal terminal of the processing unit through the fifth switch TR.

[0215] The second end of each first electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K201, is electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, is electrically connected to the ground terminal VSS of the processing unit through the third switch K203, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and is electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0216] The first end of each second electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K201, is electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, is electrically connected to the ground terminal VSS of the processing unit through the third switch K203, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and is electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0217] The second end of each second electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K201, is electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, is electrically connected to the ground terminal VSS of the processing unit through the third switch K203, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and is electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0218] Specifically, the first end and the second end of each first electrode may be provided with five switches, which are electrically connected to the corresponding ports of the processing unit; the first end and the second end of each second electrode may be provided with five switches, which are electrically connected to the corresponding ports of the processing unit. By controlling the on and off of multiple switches, different touch modes can be achieved.

[0219] Among them, the first switch K201 is electrically connected to the reference potential terminal VREF of the processing unit, and can provide a reference potential; the second switch K202 is electrically connected to the driving signal terminal PG of the processing unit, and provides a driving signal to the first electrode or the second electrode during self-capacitance detection, such as a sine wave or square wave with a driving signal frequency between 10Khz and 1Mhz, and the signal frequency is usually different from the resonant frequency of the stylus to avoid mutual interference; the third switch K203 is electrically connected to the ground terminal VSS of the processing unit; the fourth switch K204 is electrically connected to the common potential terminal COM of the processing unit, and can short-circuit the two electrodes to form a coil loop required for electromagnetic pen touch position detection. The fifth switch K205 is electrically connected to the transceiver signal terminal TR of the processing unit, and is used to send and receive signals.

[0220] In some embodiments, Figure 6 A schematic diagram of switch connections between electrodes and a processing unit in another touch panel provided by an embodiment of the present disclosure. Figure 6 As shown, the first end of each first electrode is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch K206; the second end of each first electrode is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch K206. The first end of each second electrode is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch K206; the second end of each second electrode is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch K206;

[0221] The sixth switches K206 connected to the same electrode terminal are connected in parallel with each other and with the fifth switch K205.

[0222] See also Figure 6For the convenience of description, the transceiver signal terminals connected by different switches are named TR1, TR2, TR3, and TR4. For example, the fifth switch K205 is connected to the transceiver signal terminal TR1, the first sixth switch K206 is connected to the transceiver signal terminal TR2, the second sixth switch K207 is connected to the transceiver signal terminal TR3, and the third sixth switch K208 is connected to the transceiver signal terminal TR4.

[0223] The embodiment of the present disclosure is provided with a fifth switch and at least one sixth switch. When detecting the touch position, multiple pairs of electrodes can be detected simultaneously, thereby forming at least two sensing receiving signal channels, so as to satisfy the touch panel to simultaneously transmit multiple groups of sensing receiving signals to the processing unit, thereby improving the detection speed.

[0224] It should be noted that Figure 6 Four switches are exemplarily provided to connect to corresponding signal transmitting and receiving terminals, thereby forming four sensing and receiving signal channels. The embodiment of the present disclosure does not limit the specific number of switches, and only needs to meet actual needs.

[0225] Exemplarily, taking the first electrode as an example, when the first end of the first electrode performs self-capacitance signal detection, all switches corresponding to the second end of the first electrode are disconnected.

[0226] When the first end corresponding to the first electrode performs mutual capacitance signal detection, the first switch K201 corresponding to the second end of the first electrode is turned on to be electrically connected to the reference potential terminal VREF of the processing unit.

[0227] When the first electrode is used to send a signal, the first end of the first electrode is electrically connected to the ground terminal VSS of the processing unit through the third switch K203, then the first end of the fifth switch corresponding to the second end of the first electrode is also connected to the driving signal terminal PG of the processing unit through the second switch K202.

[0228] When the first electrode is used to send a signal and the second end is connected to the driving signal terminal PG of the processing unit through the second switch K202, the first end of the first electrode is controlled to be connected to the ground terminal VSS of the processing unit through the third switch K203.

[0229] When the first electrode is used to detect a self-capacitance signal, a mutual-capacitance signal or a stylus pen signal, the second end of the first electrode is controlled to be connected to the receiving and transmitting signal end of the processing unit through the fifth switch K205.

[0230] When the first electrode is used to detect self-capacitance signals, mutual capacitance signals or stylus signals and the transceiver signal terminal TR1 corresponding to the second end of the first electrode is connected to other electrodes, the second end of the first electrode is controlled to be connected to the transceiver signal terminal TR2 of the processing unit through the first sixth switch K206.

[0231] When the first electrode is used to detect self-capacitance signals, mutual capacitance signals or stylus signals and the transceiver signal terminals TR1 and TR2 corresponding to the first electrode are connected to other electrodes, the second end of the first electrode is controlled to be connected to the transceiver signal terminal TR3 of the processing unit through the second sixth switch K207.

[0232] When the first electrode is used to detect self-capacitance signals, mutual capacitance signals or stylus signals and the transceiver signal terminals TR1, TR2, and TR3 corresponding to the first electrode are connected to other electrodes, the second end of the first electrode is controlled to be connected to the transceiver signal terminal TR4 of the processing unit through the third sixth switch K208.

[0233] When the first electrode is part of the coil loop and the first end of the first electrode is not connected to the transceiver signal terminal TR of the processing unit, the first end of the first electrode is controlled to be connected to the common signal terminal COM of the processing unit through the fourth switch K204.

[0234] Figure 7 A schematic diagram of a signal detection provided in this embodiment, such as Figure 7 As shown, two first ends of first electrodes are exemplarily provided, the first end of the first first electrode is 301 and the first end of the second first electrode is 302, and both first ends are provided with eight switches electrically connected to corresponding ports of the processing unit.

[0235] Among them, the first end 301 of the first first electrode is connected to the eight switches K11-K18, the first end 301 of the first electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K11, is electrically connected to the driving signal terminal PG of the processing unit through the second switch K12, is electrically connected to the ground terminal VSS of the processing unit through the third switch K13, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K14, is electrically connected to the transceiver signal terminal TR1 of the processing unit through the fifth switch K15, is connected to the transceiver signal terminal TR2 of the processing unit through the first sixth switch K16, is connected to the transceiver signal terminal TR3 of the processing unit through the second sixth switch K17, and is connected to the transceiver signal terminal TR4 of the processing unit through the third sixth switch K18.

[0236] Among them, the first end 302 of the second first electrode is connected to the eight switches K21-K28, the first end 301 of the first electrode is electrically connected to the reference potential terminal VREF of the processing unit through the first switch K21, is electrically connected to the driving signal terminal PG of the processing unit through the second switch K22, is electrically connected to the ground terminal VSS of the processing unit through the third switch K23, is electrically connected to the common potential terminal COM of the processing unit through the fourth switch K24, is electrically connected to the transceiver signal terminal TR1 of the processing unit through the fifth switch K25, is connected to the transceiver signal terminal TR2 of the processing unit through the first sixth switch K26, is connected to the transceiver signal terminal TR3 of the processing unit through the second sixth switch K27, and is connected to the transceiver signal terminal TR4 of the processing unit through the third sixth switch K28.

[0237] Therefore, when the first first electrode and the second first electrode are used for touch detection, the differential signal can be obtained by controlling the on and off of the corresponding switches, and then amplified, orthogonal modulated, analog-to-digital converted and other processing is performed to obtain accurate touch data based on the differential signal calculation to achieve different touch modes.

[0238] The present disclosure also provides a touch control system. Figure 8 A structural diagram of a touch control system provided by an embodiment of the present disclosure is shown in FIG. Figure 8 As shown, the touch control system includes: a touch pen 20 and a touch panel as any one of the above touch panel embodiments.

[0239] The stylus pen 20 includes an LC resonant circuit, and part or all of the electrical energy of the stylus pen 20 when it is working is provided by the excitation coil of the touch panel.

[0240] The stylus pen 20 includes an LC resonant circuit. Under the action of an excitation signal, the excitation coil excites the stylus pen, and the LC resonant circuit in the stylus pen 20 works. When the stylus pen 20 works, part or all of the electrical energy is provided by the excitation coil of the touch panel.

[0241] In some embodiments, the stylus includes an electromagnetic stylus and / or a capacitive stylus;

[0242] Wherein, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen;

[0243] The active electromagnetic pen includes a battery and an LC resonance control circuit;

[0244] The passive electromagnetic pen includes an analog passive electromagnetic pen or a digital passive electromagnetic pen;

[0245] The analog passive electromagnetic pen does not contain LC resonance control circuit and pressure sensitivity value digitization circuit;

[0246] The digital passive electromagnetic pen includes an LC resonance control circuit and a pressure sense value digitization circuit;

[0247] The capacitive stylus comprises a receiving electrode, a sending electrode and a pressure-sensing value digitizing circuit.

[0248] The touch pen includes an electromagnetic pen and a capacitive pen. The touch system provided by the embodiment of the present disclosure is compatible with the electromagnetic pen and the capacitive pen. Among them, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen. The passive electromagnetic pen works passively, and the power required for the work comes from the touch screen excitation coil. The passive electromagnetic pen does not require an independent battery, is small in size, and is easy to carry with the electronic device as a whole, and can bring better operation accuracy and user experience. The power supply in the active electromagnetic pen is used to support other operations of the electromagnetic pen except touch operation. The passive electromagnetic pen includes an analog passive electromagnetic pen or a digital passive electromagnetic pen. The analog passive electromagnetic pen does not contain an LC resonance control circuit and a pressure sense value digitization circuit. The capacitor in the LC resonance circuit in the pen is a variable capacitor. For example, when the pen tip pressure ranges from 0 to 500g, C ranges from 4000pf to 4200pf, L is fixed, and the pen resonance frequency ranges from 503khz to 491khz.

[0249] The digital passive electromagnetic pen includes an LC resonance control circuit and a pressure sensitivity value digitization circuit, so there are differences between the two in the signal transmission process. The specific process can be referred to the corresponding position of this application and will not be repeated here.

[0250] The disclosed embodiment also provides a control method for a touch panel, the touch panel being any one of the touch panel embodiments described above, the method comprising a first touch control stage and a second touch control stage;

[0251] In the first touch control stage, a driving signal is provided to the first electrode and the second electrode, and finger touch control data is determined according to the sensing reception signals of the first electrode and the second electrode;

[0252] In the second touch control stage, an excitation signal is provided to the excitation coil, and after the excitation signal stops, touch data of the stylus is determined according to the induction receiving signals of the first electrode and the second electrode.

[0253] The control method of the touch panel includes a first touch stage and a second touch stage. The first touch stage supports finger touch operations, while the second touch stage supports stylus touch operations. The present disclosure satisfies different types of touch operations through time division multiplexing.

[0254] In the first touch stage, the finger touches the touch panel, the processing unit provides a driving signal to the first electrode and the second electrode, the electrode touched by the finger generates an induction receiving signal, and the processing unit can determine the finger touch data, such as touch positioning or other touch instructions, based on the induction receiving signal.

[0255] In the second touch stage, the stylus performs a touch operation on the touch panel, and the processing unit provides an excitation signal to the excitation coil. After the excitation signal stops, the oscillation circuit in the stylus oscillates and outputs a resonance signal to the touch panel. The first electrode and the second electrode generate an induction receiving signal according to the resonance signal of the stylus. The processing unit can determine the touch data of the stylus according to the induction receiving signal, such as touch positioning or other touch instructions. The stylus can be divided into a capacitive stylus and an electromagnetic stylus. There is a difference in the process of generating the induction receiving signal between the two. The embodiment of the present disclosure is compatible with both types of styluses.

[0256] Exemplarily, the order of detecting the first touch stage and the second touch stage can be preset, such as performing the first touch stage first and then the second touch stage, which means first determining the finger touch data and then obtaining the touch data of the stylus. The stylus touch includes capacitive pen touch and electromagnetic pen touch, so the type of pen can also be specifically set in the second touch stage. For example, perform finger touch first and then electromagnetic pen touch; or perform finger touch first and then capacitive pen touch; or perform finger touch, electromagnetic pen touch, or capacitive pen touch in sequence; or adjust the above touch order. Combined with actual operation conditions, users often use different touch methods randomly, and the touch panel can also obtain corresponding touch data according to actual operation.

[0257] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0258] Get the stylus type trigger signal;

[0259] Determining the capacitive pen touch mode based on the stylus type trigger signal, providing an excitation signal to the excitation coil in the second touch stage, and determining the capacitive pen touch data according to the induction receiving signals of the first electrode and the second electrode after the excitation signal stops;

[0260] Or based on the stylus type trigger signal, the electromagnetic pen touch mode is determined. In the second touch stage, an excitation signal is provided to the excitation coil. After the excitation signal stops, the touch data of the electromagnetic pen is determined according to the induction receiving signals of the first electrode and the second electrode.

[0261] Since the stylus includes capacitive stylus and electromagnetic stylus, different types of stylus have different touch modes, and the operations of the processing unit for touch detection are also different. Therefore, in the second touch stage, it can be specifically distinguished whether the current mode is capacitive stylus touch mode or electromagnetic stylus touch mode, so as to accurately determine the touch data of the stylus.

[0262] First, a stylus type trigger signal is obtained. For example, a physical button is set on the screen or a stylus type trigger signal is sent to the processing unit through software control. The processing unit can determine the stylus type according to the obtained stylus type trigger signal, and then perform touch detection corresponding to the determined stylus type in the second touch stage.

[0263] Specifically, if it is determined based on the stylus type trigger signal that the current mode is a capacitive pen touch mode, in the second touch stage, the processing unit provides a fifth excitation signal to the excitation coil. After the excitation of the fifth excitation signal ends, the capacitive pen obtains part of the stored energy or all of the stored energy from the fifth excitation signal, and the capacitive pen can send a feedback signal to the touch panel according to a preset communication protocol.

[0264] After the fifth excitation signal stops, the resonant circuit in the capacitive pen resonates and outputs a resonant signal to the touch screen. The processing unit obtains the sensing reception signals of the Nth first electrode and the N+1th first electrode. Control N to increase from 1, where N is a positive integer greater than or equal to 1, to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determine the capacitive pen touch coordinates in the first direction based on the sensing reception signals of each adjacent first electrode. Similarly, similar to the above process of obtaining the sensing reception signals of all adjacent first electrodes of the touch screen, obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and determine the capacitive pen touch coordinates in the second direction based on the sensing reception signals of each adjacent second electrode. Then determine the touch data of the capacitive pen, that is, the accurate touch position coordinates of the capacitive pen.

[0265] If it is determined that the current electromagnetic pen touch mode is based on the stylus type trigger signal, in the second touch stage, the processing unit provides a first excitation signal to the excitation coil, controls the Pth first electrode and the Qth first electrode to form a coil loop, and obtains the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops. That is, the Pth first electrode and the Qth first electrode are at least adjacent electrodes, and some electrodes can also be spaced apart, but the number of spaced electrodes should not be too many. Too many spaced electrodes will result in a large detection range and the electromagnetic pen touch position cannot be accurately determined. After the first excitation signal stops, if there is an electromagnetic pen above the touch screen, the resonant circuit in the electromagnetic pen resonates, and the Pth first electrode and the Qth first electrode form a coil loop that can generate an electromagnetic induction receiving signal according to the electromagnetic pen resonant signal. Control P to increase from 1 to obtain the electromagnetic induction receiving signal of the coil loop formed by all the first electrodes of the touch screen. Since the electromagnetic induction receiving signal corresponding to the position touched by the electromagnetic pen is different from the electromagnetic induction receiving signal corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the first direction are determined according to the electromagnetic induction receiving signals of each coil loop. Similarly, similar to the process of obtaining the electromagnetic pen touch coordinates in the first direction, the electromagnetic pen touch coordinates in the second direction are determined according to the electromagnetic induction receiving signals of each coil loop, and then the electromagnetic pen touch data, that is, the accurate touch position coordinates of the electromagnetic pen, are determined.

[0266] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0267] If no stylus type trigger signal is obtained within a preset time, an excitation signal is provided to the excitation coil in the second touch stage. After the excitation signal stops, touch data of the stylus in the default mode is determined based on the induction receiving signals of the first electrode and the second electrode.

[0268] In the disclosed embodiment, the touch panel is provided with a default mode, which may be a capacitive pen touch mode or an electromagnetic pen touch mode, to accommodate application scenarios in which the processing unit fails to obtain a stylus type trigger signal within a preset time.

[0269] For example, the default mode is the capacitive pen touch mode. If no stylus type trigger signal is obtained within a preset time, it is assumed that the user uses a capacitive pen to touch the touch panel. The processing unit performs capacitive pen touch detection in the second touch stage.

[0270] Optionally, if the default mode is the electromagnetic pen touch mode, and no stylus type trigger signal is obtained within a preset time, it is assumed that the user uses an electromagnetic pen to touch the touch panel, and the processing unit performs electromagnetic pen touch detection in the second touch stage.

[0271] In some embodiments, in the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes:

[0272] If no stylus type trigger signal is obtained within the preset time, in the second touch stage, an excitation signal is provided to the excitation coil in a time-sharing manner. After the excitation signal stops, the touch data of the capacitive pen and the electromagnetic pen are determined based on the induced receiving signals of the first electrode and the second electrode.

[0273] If the stylus type trigger signal is not obtained within the preset time and the touch panel is not set to the default mode, the processing unit can perform capacitive pen touch detection and electromagnetic pen touch detection in a time-sharing manner in the second touch stage.

[0274] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0275] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A touch panel, It is characterized in that include: Touch screen; The touch area of ​​the touch screen is provided with a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction; The first direction and the second direction intersect, so that the first electrode and the second electrode are insulated and cross-arranged; An excitation coil, wherein the excitation coil is arranged around a touch area of ​​the touch screen; a processing unit, wherein the processing unit is electrically connected to the first electrode, the second electrode and the excitation coil respectively; The processing unit is used to provide a driving signal to the first electrode and the second electrode in a first touch stage, and determine the finger touch data according to the induction receiving signals of the first electrode and the second electrode; provide an excitation signal to the excitation coil in a second touch stage, and after the excitation signal stops, determine the touch data of the stylus according to the induction receiving signals of the first electrode and the second electrode; Both ends of the first electrode are electrically connected to the processing unit through wires; both ends of the second electrode are electrically connected to the processing unit through wires; The distribution of each of the wires satisfies any one of the following: Each of the wires is led out from one side of the touch area; Each of the wires is led out from two sides of the touch area; Each of the wires is led out from three sides of the touch area; Each of the wires is led out from four sides of the touch area; The first end of each of the first electrodes, the second end of each of the first electrodes, the first end of each of the second electrodes, and both ends of each of the second electrodes are electrically connected to the common potential end of the processing unit through a corresponding fourth switch; The processing unit is also used for: In the second touch control stage, a first excitation signal is provided to the excitation coil to control the Pth first electrode and the Qth first electrode to form a coil loop, and after the first excitation signal stops, an electromagnetic induction receiving signal on the coil loop is obtained; P is controlled to increase from 1 to obtain the electromagnetic induction receiving signal of the coil loop formed by all the first electrodes of the touch screen; Determine the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction receiving signals of each coil loop; provide a first excitation signal to the excitation coil, control the P-th second electrode and the Q-th second electrode to form a coil loop, and obtain the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops; control P to increase from 1 to obtain the electromagnetic induction receiving signal of the coil loop formed by all the second electrodes of the touch screen; determine the electromagnetic pen touch coordinates in the second direction according to the electromagnetic induction receiving signals of each coil loop; wherein P and Q are both positive integers, and QP is greater than or equal to 1; Alternatively, in the second touch stage, a fifth excitation signal is provided to the excitation coil so that the capacitive pen sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends; the sensing reception signals of the Nth first electrode and the N+1th first electrode are obtained; N is controlled to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and the capacitive pen touch coordinates in the first direction are determined according to the sensing reception signals of each adjacent first electrode; the fifth excitation signal is provided to the excitation coil so that the capacitive pen sends a feedback signal according to the fifth excitation signal after the excitation of the fifth excitation signal ends; the sensing reception signals of the Mth second electrode and the M+1th second electrode are obtained; M is controlled to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and the capacitive pen touch coordinates in the second direction are determined according to the sensing reception signals of each adjacent second electrode.

2. The touch panel according to claim 1, It is characterized in that Each of the wires is led out from one side of the touch area; the side from which each of the wires is led out is a lead-out side; part of the wires on the side opposite to the lead-out side are arranged and extended on the left side of the touch area, and part of the wires are arranged and extended on the right side of the touch area.

3. The touch panel according to claim 1, It is characterized in that The excitation waveform of the excitation coil is a sine wave or a square wave; The excitation frequency of the excitation signal provided by the processing unit to the excitation coil is greater than 10 khz; The excitation duration of the excitation signal provided by the processing unit to the excitation coil includes 1-100 microseconds, 100-800 microseconds, and 800-3000 microseconds.

4. The touch panel according to claim 1, It is characterized in that The processing unit is used for: In the first touch control stage, a driving signal is provided to the Nth first electrode and the N+1th first electrode, and a sensing reception signal of the Nth first electrode and the N+1th first electrode is obtained; Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determining the finger touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode; Providing a driving signal to the Mth second electrode and the M+1th second electrode, and acquiring a sensing reception signal of the Mth second electrode and the M+1th second electrode; Control M to increase from 1 to obtain the sensing reception signals of all adjacent second electrodes of the touch screen; and determining the finger touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode; Providing a driving signal to a first electrode corresponding to the finger touch coordinates in the first direction, and determining the finger touch position according to a receiving signal of a second electrode corresponding to the finger touch coordinates in the second direction; Wherein, N and M are both positive integers greater than or equal to 1.

5. The touch panel according to claim 4, It is characterized in that The processing unit provides a driving signal to the Nth first electrode and the N+1th first electrode in the first touch stage, and obtains the sensing reception signal of the Nth first electrode and the N+1th first electrode, including: in the first touch stage, controlling the first end of each first electrode to be suspended or connected to a reference level, controlling the second end of the Nth first electrode and the N+1th first electrode to receive the driving signal, and connecting the two input ends of the differential amplifier of the processing unit to obtain the differential signal between the Nth first electrode and the N+1th first electrode; The processing unit provides a driving signal to the Mth second electrode and the M+1th second electrode, and obtains the sensing receiving signal of the Mth second electrode and the M+1th second electrode, including: controlling the first end of each second electrode to be suspended or connected to a reference level, controlling the second end of the Mth second electrode and the M+1th second electrode to receive the driving signal, and connecting the two input ends of the differential amplifier of the processing unit to obtain the differential signal between the Mth second electrode and the M+1th second electrode.

6. The touch panel according to claim 5, It is characterized in that The processing unit provides the first excitation signal to the excitation coil in the second touch control stage, controls the Pth first electrode and the Qth first electrode to form a coil loop, and obtains the electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch control stage, provides the first excitation signal to the excitation coil, controls the first end of the Pth first electrode and the first end of the Qth first electrode to be short-circuited, connects the second ends of the Pth first electrode and the Qth first electrode to the two input ends of the differential amplifier of the processing unit, so that the Pth first electrode and the Qth first electrode form a coil loop, and obtains the differential signal between the Pth first electrode and the Qth first electrode after the excitation of the first excitation signal ends; The processing unit provides a first excitation signal to the excitation coil, controls the P-th second electrode and the Q-th second electrode to form a coil loop, and obtains an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops, including: in the second touch stage, provides a first excitation signal to the excitation coil, controls the first end of the P-th second electrode and the first end of the Q-th second electrode to be short-circuited, connects the second ends of the P-th second electrode and the Q-th second electrode to the two input ends of the differential amplifier of the processing unit, so that the P-th second electrode and the Q-th second electrode form a coil loop, and obtains the differential signal between the P-th second electrode and the Q-th second electrode after the excitation of the first excitation signal ends.

7. The touch panel according to claim 5, It is characterized in that The processing unit is used to determine the signal frequency according to the electromagnetic induction receiving signal of any coil loop corresponding to the preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction, and determine the touch pressure data or key status data of the electromagnetic pen according to the signal frequency.

8. The touch panel according to claim 5, It is characterized in that The processing unit is also used to provide a second excitation signal to the excitation coil in the second touch stage to send an electromagnetic signal to the electromagnetic pen. After the second excitation signal ends, an electromagnetic induction receiving signal corresponding to any coil loop within a preset distance range of the electromagnetic pen touch coordinates in the first direction or the second direction is obtained, and touch pressure data or button status data is determined according to the signal frequency of the electromagnetic induction receiving signal.

9. The touch panel according to claim 7 or 8, It is characterized in that The processing unit determines the touch pressure sensing data or the button status data according to the signal frequency of the electromagnetic induction receiving signal, including: determining the touch pressure sensing data according to the difference between the signal frequency of the electromagnetic induction receiving signal and the reference frequency; according to the signal frequency of the electromagnetic induction receiving signal being in a preset frequency range, determining the button status data corresponding to the preset frequency range as the current button status data of the electromagnetic pen.

10. The touch panel according to claim 5, It is characterized in that The processing unit is used to provide a first excitation signal to the excitation coil, so that the electromagnetic pen collects at least one of touch pressure sensing data, key state data and electromagnetic pen identification data; Providing a third excitation signal to the excitation coil to determine first data to be transmitted of the electromagnetic pen; providing a fourth excitation signal to the excitation coil, so that the electromagnetic pen transmits the first data to be transmitted based on the fourth excitation signal; Controlling the coil loop formed by the first electrode or the second electrode corresponding to the touch coordinates of the electromagnetic pen to receive the electromagnetic induction receiving signal generated based on the first data to be transmitted and analyzing it to obtain the first data to be transmitted; The first data to be transmitted includes at least one of touch pressure sensing data, button status data and electromagnetic pen identification data.

11. The touch panel according to claim 10, It is characterized in that The processing unit is used to: provide a sixth excitation signal to the excitation coil, so that the capacitive pen transmits the second data to be transmitted after the excitation of the sixth excitation signal ends; Acquire a sensing received signal based on the second data to be transmitted of the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or acquire a sensing received signal based on the second data to be transmitted of the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction; At least one of the touch pressure sensing data, the button status data and the capacitive pen identification data of the capacitive pen is determined according to the sensing received signal.

12. The touch panel according to claim 1, It is characterized in that The first end of each of the first electrodes is electrically connected to the reference potential end of the processing unit through the first switch, is electrically connected to the driving signal end of the processing unit through the second switch, is electrically connected to the ground end of the processing unit through the third switch, and is electrically connected to the transceiver signal end of the processing unit through the fifth switch; The second end of each of the first electrodes is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the driving signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, and electrically connected to the transceiver signal end of the processing unit through the fifth switch; The first end of each second electrode is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the driving signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, and electrically connected to the transceiver signal end of the processing unit through the fifth switch; The second end of each second electrode is electrically connected to the reference potential end of the processing unit through the first switch, electrically connected to the driving signal end of the processing unit through the second switch, electrically connected to the ground end of the processing unit through the third switch, and electrically connected to the receiving and transmitting signal end of the processing unit through the fifth switch.

13. The touch panel according to claim 12, It is characterized in that The first end of each of the first electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the second end of each of the first electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the first end of each of the second electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; the second end of each of the second electrodes is also electrically connected to the transceiver signal end of the processing unit through at least one sixth switch; The sixth switches connected to the same electrode terminal are connected in parallel with each other and with the fifth switch.

14. An electronic device, It is characterized in that It comprises a touch panel as claimed in any one of claims 1 to 13.

15. A touch control system, It is characterized in that include: A touch pen and a touch panel as claimed in any one of claims 1 to 13; The stylus pen includes an LC resonant circuit, and part or all of the electrical energy of the stylus pen when it is working is provided by the excitation coil of the touch panel.

16. The touch control system according to claim 15, It is characterized in that The stylus pen includes an electromagnetic pen and / or a capacitive pen; Wherein, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen; The active electromagnetic pen includes a battery and an LC resonance control circuit; The passive electromagnetic pen includes an analog passive electromagnetic pen or a digital passive electromagnetic pen; The analog passive electromagnetic pen does not contain an LC resonance control circuit and a pressure sensitivity value digitization circuit; The digital passive electromagnetic pen comprises an LC resonance control circuit and a pressure sensitivity value digitization circuit; The capacitive stylus comprises a receiving electrode, a sending electrode and a pressure-sensing value digitizing circuit.

17. A method for controlling a touch panel, It is characterized in that The touch panel is the touch panel according to any one of claims 1 to 13, and the method comprises a first touch stage and a second touch stage; In the first touch control stage, a driving signal is provided to the first electrode and the second electrode, and finger touch control data is determined according to the induction receiving signals of the first electrode and the second electrode; In the second touch control stage, an excitation signal is provided to the excitation coil, and after the excitation signal stops, touch control data of the stylus is determined according to the induction receiving signals of the first electrode and the second electrode; In the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch control data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes: Get the stylus type trigger signal; Determining the capacitive pen touch mode based on the stylus type trigger signal, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the capacitive pen touch data according to the induction receiving signals of the first electrode and the second electrode; Or based on the stylus type trigger signal, the electromagnetic pen touch mode is determined, in the second touch stage, an excitation signal is provided to the excitation coil, and after the excitation signal stops, the touch data of the electromagnetic pen is determined according to the induction receiving signals of the first electrode and the second electrode.

18. The method for controlling a touch panel according to claim 17, It is characterized in that In the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch control data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes: If no stylus type trigger signal is obtained within a preset time, an excitation signal is provided to the excitation coil in the second touch stage, and after the excitation signal stops, touch data of the stylus in the default mode is determined based on the induced receiving signals of the first electrode and the second electrode.

19. The method for controlling a touch panel according to claim 17, It is characterized in that In the second touch control stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the touch control data of the stylus according to the induction receiving signals of the first electrode and the second electrode includes: If no stylus type trigger signal is obtained within a preset time, in the second touch stage, an excitation signal is provided to the excitation coil in a time-sharing manner. After the excitation signal stops, the touch data of the capacitive pen and the electromagnetic pen are determined based on the induced receiving signals of the first electrode and the second electrode.

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