Touch-control panel, touch-control system and control method for touch-control panel

Abstract

A touch-control panel, a touch-control system and a control method for a touch-control panel. The touch-control panel comprises: a touch-control screen, an excitation coil and a processing unit. The processing unit is used for: in a first touch-control stage, providing driving signals for a first electrode and a second electrode, and determining finger touch-control data on the basis of inductive received signals of the first electrode and the second electrode; and in a second touch-control stage, providing an excitation signal for the excitation coil, and, after the excitation signal is stopped, determining touch-control data of a stylus on the basis of inductive received signals of the first electrode and the second electrode. By means of the same touch-control screen and processing unit, the touch-control panel can enable the touch-control screen to achieve touch-control detection of fingers and different types of styluses, thereby reducing the manufacturing cost of the touch-control panel.

Description

Touch panel, touch system, and touch panel control method Technical Field

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

[0002] With the rapid development of technology, various new touch technologies are increasingly being used in display devices. In touch operations, users control the display device by touching and moving their finger across the touchscreen. However, finger manipulation has low precision and resolution, resulting in only crude touch operations. Consequently, styluses, such as capacitive and electromagnetic pens, have become popular. These styluses offer improved precision and resolution, enabling complex touch operations.

[0003] Current touchscreens combine finger and stylus control, effectively improving operational accuracy and user experience. However, finger-controlled touchscreens and detection systems can detect capacitive stylus touches, but not electromagnetic stylus touches, requiring a separate touchscreen detection system. Therefore, to accommodate different stylus detection requirements, two touchscreens and detection systems are required, significantly increasing the cost of the display. Therefore, the challenge remains to cost-effectively implement touchscreen detection for both finger and stylus detection.

[0004] Summary of the Invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a touch panel, a touch system and a method for controlling a touch panel.

[0006] In a first aspect, the present disclosure provides a touch panel, comprising:

[0007] 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;

[0008] an excitation coil, the excitation coil being arranged around the touch area of ​​the touch screen;

[0009] a processing unit, the processing unit being electrically connected to the first electrode, the second electrode, and the excitation coil respectively;

[0010] 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 based on the induction receiving signals of the first electrode and the second electrode; and 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 based on the induction receiving signals of the first electrode and the second electrode.

[0011] 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;

[0012] The distribution of each of the wires satisfies any one of the following:

[0013] Each of the wires is led out from one side of the touch area;

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

[0015] Each of the conductive wires is led out from three sides of the touch area;

[0016] Each of the conductive wires is led out from four sides of the touch area.

[0017] 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.

[0018] In some embodiments, the excitation waveform of the excitation coil is a sine wave or a square wave;

[0019] The excitation frequency of the excitation signal provided by the processing unit to the excitation coil is greater than 10 kHz.

[0020] 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.

[0021] In some embodiments, the processing unit is configured to:

[0022] In a first touch control phase, 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;

[0023] Controlling N to increase from 1 to obtain sensing reception signals of all adjacent first electrodes of the touch screen; and determining the touch coordinates of the finger in the first direction according to the sensing reception signals of each adjacent first electrode;

[0024] 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;

[0025] Control M to increase from 1 to obtain 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;

[0026] 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 received signal from a second electrode corresponding to the finger touch coordinates in the second direction;

[0027] Wherein, N and M are both positive integers greater than or equal to 1.

[0028] In some embodiments, the processing unit provides a driving signal to the Nth first electrode and the N+1th first electrode and obtains a sensing reception signal of the Nth first electrode and the N+1th first electrode during the first touch phase, including: controlling the first end of each first electrode to be suspended or connected to a reference potential during the first touch phase, 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 a differential amplifier of the processing unit to obtain a differential signal between the Nth first electrode and the N+1th first electrode;

[0029] 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.

[0030] In some embodiments, the processing unit is configured to:

[0031] 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 reception signal on the coil loop is obtained;

[0032] Controlling 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;

[0033] determining the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction reception signals of each coil loop;

[0034] providing a first excitation signal to the excitation coil to control the P-th second electrode and the Q-th second electrode to form a coil loop, and acquiring an electromagnetic induction receiving signal on the coil loop after the first excitation signal stops;

[0035] Controlling 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;

[0036] determining the electromagnetic pen touch coordinates in the second direction according to the electromagnetic induction reception signals of each coil loop;

[0037] Wherein, P and Q are both positive integers, and QP is greater than or equal to 1.

[0038] In some embodiments, the processing unit provides a first excitation signal to the excitation coil in the second touch stage, controls the P-th first electrode and the Q-th first electrode to form a coil loop, and obtains an electromagnetic induction reception signal on the coil loop after the first excitation signal stops, including: providing the first excitation signal to the excitation coil in the second touch stage, controlling the first end of the P-th first electrode and the first end of the Q-th first electrode to be short-circuited, connecting the second ends of the P-th first electrode and the Q-th first electrode to two input ends of a differential amplifier of the processing unit so that the P-th first electrode and the Q-th first electrode form a coil loop, and obtaining a differential signal between the P-th first electrode and the Q-th first electrode after the excitation of the first excitation signal ends;

[0039] 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, providing a first excitation signal to the excitation coil, controlling the first end of the P-th second electrode and the first end of the Q-th second electrode to be short-circuited, connecting 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 obtaining a differential signal between the P-th second electrode and the Q-th second electrode after the excitation of the first excitation signal ends.

[0040] 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.

[0041] 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, 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 is obtained, and the touch pressure data or button status data is determined based on the signal frequency of the electromagnetic induction receiving signal.

[0042] In some embodiments, the processing unit determines the touch pressure sensing data or key status data based on the signal frequency of the electromagnetic induction receiving signal, including: determining the touch pressure sensing data based on the difference between the signal frequency of the electromagnetic induction receiving signal and the reference frequency; based on the signal frequency of the electromagnetic induction receiving signal being in a preset frequency range, determining the key status data corresponding to the preset frequency range as the current key status data of the electromagnetic pen.

[0043] In some embodiments, the processing unit is configured 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;

[0044] providing a third excitation signal to the excitation coil to determine first data to be transmitted by the electromagnetic pen;

[0045] 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;

[0046] controlling a coil loop formed by a first electrode or a second electrode corresponding to the touch coordinates of the electromagnetic pen to receive an electromagnetic induction receiving signal generated based on the first data to be transmitted and analyzing the signal to obtain the first data to be transmitted;

[0047] The first data to be transmitted includes at least one of touch pressure sensing data, button status data and electromagnetic pen identification data.

[0048] In some embodiments, the processing unit is configured to:

[0049] 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;

[0050] Acquiring sensing reception signals of the Nth first electrode and the N+1th first electrode;

[0051] Controlling N to increase from 1 to obtain sensing reception signals of all adjacent first electrodes of the touch screen; and determining the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0052] 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;

[0053] Acquiring sensing reception signals of the Mth second electrode and the M+1th second electrode;

[0054] Controlling M to increase from 1 to obtain sensing reception signals of all adjacent second electrodes of the touch screen; and determining the capacitive pen touch coordinates in the second direction according to the sensing reception signals of each adjacent second electrode;

[0055] In some embodiments, the processing unit is configured 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;

[0056] Obtaining a sensing received signal based on the second data to be transmitted from the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or obtaining a sensing received signal based on the second data to be transmitted from the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction;

[0057] 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 analysis of the sensed received signal.

[0058] In some embodiments, the first end of each first electrode is electrically connected to the reference potential terminal of the processing unit through a first switch, electrically connected to the drive signal terminal of the processing unit through a second switch, electrically connected to the ground terminal of the processing unit through a third switch, electrically connected to the common potential terminal of the processing unit through a fourth switch, and electrically connected to the transceiver signal terminal of the processing unit through a fifth switch;

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

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

[0061] The second end of each second electrode is electrically connected to the reference potential terminal of the processing unit through the first switch, electrically connected to the drive signal terminal of the processing unit through the second switch, electrically connected to the ground terminal of the processing unit through the third switch, electrically connected to the common potential terminal of the processing unit through the fourth switch, and electrically connected to the transceiver signal terminal of the processing unit through the fifth switch.

[0062] In some embodiments, the first end of each first electrode is further electrically connected to the transceiver signal terminal of the processing unit through at least one sixth switch; the second end of each first electrode is further electrically connected to the transceiver signal terminal of the processing unit through at least one sixth switch; the first end of each second electrode is further electrically connected to the transceiver signal terminal of the processing unit through at least one sixth switch; and the second end of each second electrode is further electrically connected to the transceiver signal terminal of the processing unit through at least one sixth switch.

[0063] The sixth switches connected to the same electrode terminal are connected in parallel with each other and with the fifth switch.

[0064] 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.

[0065] In a third aspect, the present disclosure further provides a touch control system, comprising: a stylus and the touch panel as described in any one of the first aspects;

[0066] 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.

[0067] In some embodiments, the stylus includes an electromagnetic stylus and / or a capacitive stylus;

[0068] Wherein, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen;

[0069] The active electromagnetic pen includes a battery and an LC resonance control circuit;

[0070] The passive electromagnetic pen includes an analog passive electromagnetic pen or a digital passive electromagnetic pen;

[0071] The analog passive electromagnetic pen does not contain an LC resonance control circuit and a pressure sensitivity value digitization circuit;

[0072] The digital passive electromagnetic pen includes an LC resonance control circuit and a pressure sensitivity value digitization circuit;

[0073] The capacitive stylus comprises a receiving electrode, a sending electrode and a pressure-sensing value digitizing circuit.

[0074] 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 includes a first touch stage and a second touch stage;

[0075] In the first touch stage, driving signals are provided to the first electrode and the second electrode, and finger touch data is determined according to the sensing signals received by the first electrode and the second electrode;

[0076] 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 reception signals of the first electrode and the second electrode.

[0077] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0078] Get the stylus type trigger signal;

[0079] Determining the capacitive pen touch mode based on the stylus type trigger signal, in the second touch phase, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining capacitive pen touch data based on the induced received signals of the first electrode and the second electrode;

[0080] Or based on the stylus type trigger signal, it is determined to be an electromagnetic pen touch mode. 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 induced receiving signals of the first electrode and the second electrode.

[0081] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0082] If the stylus type trigger signal is not obtained within the preset time, in the second touch stage, an excitation signal is provided to the excitation coil. After the excitation signal stops, the 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.

[0083] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0084] If no stylus type trigger signal is obtained within the preset time, in the second touch stage, the 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.

[0085] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0086] 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 and second electrodes are insulated and arranged in an intersecting manner; an excitation coil, the excitation coil being arranged around the touch area of ​​the touch screen; and a processing unit, the processing unit being electrically connected to the first electrode, the second electrode, and the excitation coil. The processing unit is configured to provide a driving signal to the first and second electrodes in a first touch phase, and to determine finger touch data based on the induced received signals of the first and second electrodes; and to provide an excitation signal to the excitation coil in a second touch phase, and after the excitation signal stops, to determine stylus touch data based on the induced received signals of the first and second electrodes. Thus, the touch screen is equipped with a plurality of first and second electrodes arranged in an insulated and intersecting manner, and an excitation coil arranged around the touch area of ​​the touch screen. In different touch phases, the processing unit performs touch detection by time-sharing control of the first and second electrodes. For example, when a finger touches the touch screen in the first touch phase, the processing unit provides a drive signal to the first electrode and the second electrode, and the first and second electrodes generate an induction receiving signal. The processing unit can determine the finger touch data based on the induction receiving signal. When a stylus touches the touch screen in the second touch phase, the processing unit provides an excitation signal to the excitation coil. After the excitation signal stops, the resonant signal in the stylus begins to decay, and the first and second electrodes generate an induction receiving signal. The processing unit can determine the stylus touch data based on the induction receiving signal. The touch panel provided by the present disclosure can realize touch detection of fingers and different types of styluses through the same touch screen and processing unit, thereby reducing the production cost of the touch screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] 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.

[0088] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0089] FIG1 is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure;

[0090] FIG2 is a circuit diagram of a touch panel provided by an embodiment of the present disclosure;

[0091] FIG3 is a schematic diagram of the positioning principle of the electromagnetic pen in the first direction provided by an embodiment of the present disclosure;

[0092] FIG4 is a schematic diagram of the positioning principle of the electromagnetic pen in the second direction provided by an embodiment of the present disclosure;

[0093] FIG5 is a schematic diagram of switch connections between electrodes and a processing unit in a touch panel provided by an embodiment of the present disclosure;

[0094] FIG6 is a schematic diagram of switch connections between electrodes and a processing unit in another touch panel provided by an embodiment of the present disclosure;

[0095] FIG7 is a schematic diagram of a signal detection method provided by this embodiment;

[0096] FIG8 is a schematic structural diagram of a touch control system provided by an embodiment of the present disclosure.

[0097] 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

[0098] 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 therein can be combined with each other in the absence of conflict.

[0099] 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.

[0100] Styluses include capacitive pens and electromagnetic pens. Capacitive pens include active and passive capacitive pens. The detection system for capacitive pen touch is structurally similar to that for finger touch, and can utilize the same touch screen. Only the touch chips used in some touch devices differ, making them widely used. However, active capacitive pens, for example, consume relatively high power and require a battery. Consequently, they require a charge and discharge management chip, a fuel gauge chip, a supporting wireless charging coil and chip (or a wired charging interface), a heat dissipation mechanism, and battery safety features. Furthermore, active capacitive pens require a multi-electrode nib, a nib cover structure, and an active capacitive pen protocol chip. This results in a complex structure, limited space, and high assembly difficulty, leading to relatively high costs. Electromagnetic pens, on the other hand, offer high precision, high pressure sensitivity, excellent linearity, strong performance, and a minimal number of components, making them ideal styluses. However, the touch screen for electromagnetic pens differs from that for capacitive pens in structure, making it impossible to use the capacitive pen's touch screen to detect electromagnetic pen touches. Therefore, a separate touch screen must be manufactured, significantly increasing the cost of the display and making the structure thicker.

[0101] In order to solve the above problems, an embodiment of the present disclosure provides a touch panel. FIG1 is a structural diagram of a touch panel provided by an embodiment of the present disclosure. As shown in FIG1 , the touch panel includes:

[0102] The touch screen 10 has a touch area 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 and the second direction intersect, so that the first electrodes 101 and the second electrodes 102 are insulated and cross-arranged.

[0103] The excitation coil 11 is disposed around the touch area of ​​the touch screen 10 .

[0104] The processing unit 12 is electrically connected to the first electrode 101 , the second electrode 102 and the excitation coil 11 .

[0105] 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 based on the induced 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 based on the induced receiving signals of the first electrode 101 and the second electrode 102.

[0106] As shown in 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 all electrically connected to the processing unit 12. As shown in the direction of the arrows in Figure 1, the horizontal direction is the first direction, the vertical direction is the second direction, the plurality of first electrodes 101 are arranged along the first direction, and the plurality of second electrodes 102 are arranged along the second direction, and the first electrodes 101 and the second electrodes 102 are insulated and crosswise 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, and this disclosure is not limited to this. The number of the first electrodes 101 and the 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 second-direction electrodes is 53, the number of first-direction electrodes is 40, the width of each electrode or column is approximately 3.8 mm, and the length of each electrode or column is equal to or slightly larger than the length / width of the active area of ​​the touch screen. The embodiments of the present disclosure also do not impose any restrictions on this. Figure 1 only illustrates a small number of electrodes to illustrate the technical solution of the embodiments of the present disclosure.

[0107] 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. Specifically, 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 coil of wire. In Figure 1, the excitation coil 11 is formed by three coils of wire and is electrically connected to the processing unit 12. The two ends of the excitation coil 11 are electrically connected to the P1 and P2 terminals of the processing unit 12, respectively.

[0108] The touch panel also includes a processing unit 12, which is configured to provide drive signals to the first and second electrodes 101, 102 during a first touch phase and determine finger touch data based on the induced signals from the first and second electrodes 101, 102. In a second touch phase, the processing unit 12 provides an excitation signal to the excitation coil 11 and, after the excitation signal ceases, determines stylus touch data based on the induced signals from the first and second electrodes 101, 102.

[0109] For example, in the first touch stage, a finger touches the touch screen, and the processing unit 12 provides a drive signal to the first electrode 101 and the second electrode 102. The electrodes touched by the finger generate an induction receiving signal. 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 touches 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.

[0110] Since styluses include electromagnetic pens and capacitive pens, and different stylus types result in different touch modes for touch detection by the touch panel, the second touch stage can be set to either the capacitive pen touch mode or the electromagnetic pen touch mode based on actual usage. For example, a physical button can be set on the touch panel, or a stylus type trigger signal can be sent to the processing unit 12 through software control to select whether the touch panel detects touches from an electromagnetic pen or a capacitive pen.

[0111] In some optional embodiments, if the processing unit 12 does not receive a stylus type trigger signal, it may also identify the touch panel according to a preset default touch mode, such as a capacitive pen touch mode. If no stylus type trigger signal is received, the touch panel is currently in capacitive pen touch mode. Alternatively, the electromagnetic pen touch mode may be set as the default touch mode. This is not limited in the present disclosure and is provided for illustrative purposes only.

[0112] 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 may perform capacitive pen touch detection and electromagnetic pen touch detection in a time-sharing manner during the second touch phase.

[0113] In the embodiment of the present disclosure, the touch screen device has a plurality of insulated and cross-arranged first and second electrodes, as well as an excitation coil arranged around the touch area of ​​the touch screen. By time-sharing, 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 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 production costs. 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. The processing unit can determine the finger touch data based on 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. After the excitation signal stops, the oscillation circuit in the stylus resonates and outputs a resonant signal to the touch screen. The first electrode and the second electrode generate an induction receiving signal. The processing unit can determine the touch data of the stylus based on 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 touch screen and processing unit, thereby reducing the production cost of the touch screen.

[0114] 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;

[0115] The distribution of each conductor satisfies any of the following conditions:

[0116] Each wire is led out from one side of the touch area;

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

[0118] The wires are led out from three sides of the touch area;

[0119] The wires are led out from four sides of the touch area.

[0120] The touchscreen 10's touch area is equipped 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 touchscreen, the electrodes at the corresponding touched positions generate a sensed signal, from which the processing unit 12 determines the specific touch data. Therefore, it is necessary to electrically connect both ends of the first electrodes 101 to the processing unit 12 via wires, and both ends of the second electrodes 102 to the processing unit 12 via wires, in order to accurately sense touch data and improve detection accuracy.

[0121] Furthermore, 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:

[0122] Taking Figure 1 as an example, first electrode 101 extends along the second direction, second electrode 102 extends along the first direction, and processing unit 12 is located below the touch screen area. Each wire is led out from below to electrically connect to processing unit 12, thereby reducing the area occupied by the wires on the touch screen. This disclosed embodiment illustrates the wires being led out from one side of the touch screen area for illustrative purposes only; other lead-out arrangements can be configured based on actual needs.

[0123] 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.

[0124] As shown in Figure 1, 14 first electrodes are 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.

[0125] 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 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 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 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.

[0126] In some embodiments, the excitation waveform of the excitation coil is a sine wave or a square wave.

[0127] The excitation frequency of the excitation signal provided by the processing unit to the excitation coil is greater than 10kHz

[0128] 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.

[0129] When performing a touch operation, the processing unit provides an excitation signal to the excitation coil to enable the stylus to operate. The excitation waveform of the excitation coil can be a sine wave or a square wave. In some optional embodiments, the excitation waveform can 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 10kHz. The excitation duration of the excitation signal can also be different. Different excitation frequencies and excitation durations can transmit different control commands to the stylus, so that the stylus transmits corresponding touch data to the touch panel according to different control commands.

[0130] In some embodiments, the processing unit is configured to:

[0131] In a first touch control phase, 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;

[0132] Control N to increase from 1 to obtain sensing reception signals of all adjacent first electrodes of the touch screen; and determine the touch coordinates of the finger in the first direction according to the sensing reception signals of each adjacent first electrode;

[0133] 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;

[0134] Control M to increase from 1 to obtain 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;

[0135] 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 received signal from a second electrode corresponding to the finger touch coordinates in a second direction;

[0136] Wherein, N and M are both positive integers greater than or equal to 1.

[0137] During different touch phases, the processing unit can control the first and second electrodes to perform touch detection in different time periods, so that the touch panel can detect touches from fingers and different types of styluses using the same touch screen and processing unit. For example, during the first touch phase, the processing unit can control the first and second electrodes to perform finger touch detection. The specific principles of finger touch detection are detailed below:

[0138] Continuing with Figure 1, the touch screen includes multiple first electrodes 101 and multiple second electrodes 102. During the first touch detection phase, the processing unit first controls the first electrodes 101 and second electrodes 102 to perform self-capacitance detection to determine the touch coordinates of a finger in a first direction and a finger in a second direction. The processing unit then controls the first electrodes 101 and second electrodes 102 to perform mutual capacitance detection to accurately determine the touch position coordinates of one or more fingers.

[0139] Specifically, when performing self-capacitance detection, the processing unit 12 provides a drive signal to the Nth first electrode 101 and the N+1th first electrode 101, and obtains sensing reception signals from the Nth first electrode 101 and the N+1th first electrode 101. During the self-capacitance detection process, N starts at 1 and is incremented by 1 to obtain sensing reception signals between all "adjacent first electrodes" of the touch panel.

[0140] For example, the processing unit provides a driving signal to the first first electrode 101 and the second first electrode 101, and obtains sensing received signals from 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 sensing received signals from 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 sensing received signals from the third first electrode 101 and the fourth first electrode 101, and so on, until the processing unit provides a driving signal to the Nth first electrode 101 and the N+1th first electrode 101, and obtains sensing received signals from the Nth first electrode 101 and the N+1th first electrode 101, where N+1 is the number of first electrodes on the touch panel.

[0141] At this point, 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.

[0142] Similarly, the processing unit 12 provides a driving signal to the Mth second electrode 102 and the M+1th second electrode 102, and obtains sensing reception signals from the Mth second electrode 102 and the M+1th second electrode 102. During the row self-capacitance detection process, M starts at 1 and is incremented by 1 to obtain sensing reception signals between all "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 processing unit provides a driving signal to the Mth second electrode 102 and the M+1th second electrode 102, and obtains the sensing received signals of the Mth second electrode 102 and the M+1th second electrode 102, where M+1 is the number of second electrodes on the touch panel.

[0143] At this point, the sensing reception signals of all 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.

[0144] 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. As shown in Figure 1, X1 is used to represent the first first electrode, Xi represents the i-th first electrode, and i is the serial number of the first electrode; Y1 represents the first second electrode, Yj represents 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. At this time, there are four combinations of position coordinates, such as (X5, Y2), (X5, Y7), (X9, Y2) and (X9, Y7). However, 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.

[0145] 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 based on 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, based on 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 the multi-touch.

[0146] In some embodiments, the present application further provides more refined touch detection, in which the processing unit provides a drive signal to the Nth first electrode and the N+1th first electrode in the first touch phase, and obtains a sensing reception signal of the Nth first electrode and the N+1th first electrode, including: in the first touch phase, 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 drive signal, and connecting two input ends of a differential amplifier of the processing unit to obtain a differential signal between the Nth first electrode and the N+1th first electrode;

[0147] The processing unit provides a driving signal to the Mth second electrode and the M+1th second electrode, and obtains the sensing reception 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.

[0148] For example, the sensing received signal provided by the embodiments of the present disclosure is a differential signal, and the finger touch position is determined by the differential signal. Continuing with FIG1 , the first end of the first electrode 101 is the X-terminal (above the first electrode 101 in FIG1 ), and the second end is the X+terminal (below the first electrode 101 in FIG1 ). The first end of the second electrode 102 is the Y-terminal (to the right of the second electrode 102 in FIG1 ), and the second end is the Y+terminal (to the left of the second electrode 102 in FIG1 ).

[0149] For example, a touch panel with 14 first electrodes and 10 second electrodes is used. During self-capacitance detection, electrodes X1-...X14- and Y1-...X10- are left floating. Pairs X1+X2+, X2+X3+, X3+X4+, X4+X5+,...X11+X12+, X12+X13+, X13+X14+, Y1+Y2+, Y2+Y3+, Y3+Y4+, Y4+Y5+,...Y8+Y9+, and Y9+Y10+ are differentially detected, amplified, quadrature modulated, integrated, and subjected to ADC analog-to-digital conversion. During two-finger mutual capacitance detection, if the previous self-capacitance detection step determined that a finger was clearly touching electrodes X5, X9, Y2, and Y7, the sensors are paired one by one. First, the processing unit controls the supply of a drive signal to X5+, grounding X5- to VSS. Y2+, Y3+, and Y7+, Y8+, undergo differential amplification, re-amplification, quadrature modulation, integration, and ADC analog-to-digital conversion in pairs. The remaining electrodes are connected to the reference voltage VREF. For example, this indicates a finger touch at the intersection of the X5 and Y2 electrodes, while no finger touches the intersection of the X5 and Y7 electrodes. Then, similarly to the above method, a drive signal is supplied to X9+, grounding X9- to VSS. Y2+, Y3+, and Y7+, Y8+, undergo differential amplification, re-amplification, quadrature modulation, integration, and ADC analog-to-digital conversion in pairs. The remaining electrodes are connected to the reference voltage VREF. For example, this indicates a finger touch at the intersection of the X9 and Y7 electrodes, while no finger touches the intersection of the X9 and Y2 electrodes. Ultimately, two finger touch locations are accurately determined: one near (X5, Y2) and one near (X9, Y7).

[0150] Figure 2 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 drive signal. The following uses Figure 2 as an example to describe the control of the connection channels of the first and second electrodes by the processing unit. The second end 201 of the Nth first electrode receives the drive signal PG through the first resistor R1, and the second end 202 of the N+1th first electrode receives the drive signal PG through the second resistor R2. The second end 201 of the Nth first electrode is connected to the non-inverting input 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 inverting input 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. The finger touch coordinates in the first direction are determined based on 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.

[0151] Similarly, the first end of the second electrode is controlled to be floating or connected to a reference voltage, and the second ends of the Mth second electrode and the M+1th second electrode are controlled to receive a drive signal via a resistor. The second end of the Mth second electrode receives the drive signal PG via the first resistor, and the second end of the M+1th second electrode receives the drive signal PG via the second resistor. The second end of the Mth second electrode is connected to the non-inverting input of the differential amplifier of the processing unit via a third resistor, and the second end of the M+1th second electrode is connected to the inverting input of the differential amplifier of the processing unit via a fourth resistor, to obtain a differential signal between the Mth second electrode and the M+1th second electrode. The processing unit controls M to increment starting from 1, where M is a positive integer greater than or equal to 1. Differential signals are obtained for all adjacent second electrodes of the touch panel, where 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. The finger touch coordinates in the first direction are determined based on the differential signals of each adjacent second electrode. For example, the finger touch coordinates in the second direction where one or more fingers touch can be determined.

[0152] Optionally, as shown in Figure 2, 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 to obtain accurate touch data based on the differential signal calculation.

[0153] In some embodiments, the processing unit is configured to:

[0154] 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 reception signal on the coil loop is obtained;

[0155] 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;

[0156] determining the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction reception signals of each coil loop;

[0157] providing a first excitation signal to the excitation coil to control 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;

[0158] 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;

[0159] determining the electromagnetic pen touch coordinates in the second direction according to the electromagnetic induction reception signals of each coil loop;

[0160] Wherein, P and Q are both positive integers, and QP is greater than or equal to 1.

[0161] The touch panel uses time-division multiplexing of the first and second electrodes during different touch phases, allowing the processing unit to determine different touch data. In the second touch phase, the disclosed embodiment enables the processing unit to determine the touch data of the electromagnetic pen. The touch data of the electromagnetic pen in the disclosed embodiment includes the electromagnetic pen touch location, which determines the specific location on the touch panel where the electromagnetic pen touched.

[0162] FIG3 is a schematic diagram of the positioning principle of the electromagnetic pen in the first direction provided by an embodiment of the present disclosure. As shown in FIG1 and FIG3, the touch screen includes a plurality of first electrodes 101. FIG3 exemplarily shows a portion of the first electrodes 101 and the processing unit 12. In the second touch stage, the processing unit 12 provides a first excitation signal to the excitation coil (not shown in FIG3), controls 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 may be spaced apart. However, the number of spaced electrodes should not be too large. Too many spaced electrodes will result in an excessively large detection range, making it impossible to accurately determine the touch position of the electromagnetic pen. For example, in Figure 4, 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.

[0163] P is controlled to increment from 1 to obtain electromagnetic induction reception signals for the coil loops formed by all first electrodes 101 of the touch screen. Because the electromagnetic induction reception signals corresponding to the position touched by the electromagnetic pen differ from the electromagnetic induction reception signals corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the first direction are determined based on the electromagnetic induction reception signals of each coil loop.

[0164] Similarly, FIG4 is a schematic diagram of the positioning principle of the electromagnetic pen in the second direction provided by an embodiment of the present disclosure. In combination with FIG1 and FIG4 , the touch screen includes a plurality of second electrodes 102. FIG5 exemplarily shows some of the second electrodes 102 and the processing unit 12. In the second touch stage, the processing unit 12 provides a first excitation signal to the excitation coil (not shown in FIG4 ), controls the P-th second electrode 102 and the Q-th second electrode 102 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 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 an excessively large detection range, making it impossible to accurately determine the touch position of the electromagnetic pen. For example, the excitation coil provides a first excitation signal, and the electromagnetic pen obtains excitation energy and is stimulated to oscillate. In FIG5 , P is 1, Q is 4, and 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 toward the first second electrode 102 and the fourth second electrode 102, thereby generating an electromagnetic induction receiving signal according to the electromagnetic pen resonant signal.

[0165] P is controlled to increment from 1 to obtain electromagnetic induction reception signals for the coil loops formed by all second electrodes 102 of the touch screen. Because the electromagnetic induction reception signals corresponding to the position touched by the electromagnetic pen differ from the electromagnetic induction reception signals corresponding to the position not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the second direction are determined based on the electromagnetic induction reception signals of each coil loop.

[0166] In some embodiments, the processing unit provides a 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 an electromagnetic induction reception signal on the coil loop after the first excitation signal stops, including: providing the first excitation signal to the excitation coil in the second touch stage, 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 two input ends of a differential amplifier of the processing unit so that the Pth first electrode and the Qth first electrode form a coil loop, and obtaining a differential signal between the Pth first electrode and the Qth first electrode after the excitation of the first excitation signal ends;

[0167] 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, providing the first excitation signal to the excitation coil, controlling the first end of the P-th second electrode and the first end of the Q-th second electrode to be short-circuited, connecting 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 obtaining the differential signal between the P-th second electrode and the Q-th second electrode after the excitation of the first excitation signal ends.

[0168] For example, the electromagnetic induction receiving signal provided by the embodiments of the present disclosure is a differential signal, and the touch position of the electromagnetic pen is determined by the differential signal. Continuing with reference to Figures 1 and 3, for example, in the second touch phase, the processing unit 12 provides a first excitation signal to the excitation coil, controls the first ends of the Pth first electrode 101 and the Qth first electrode 101 to be short-circuited, and controls the second ends of the Pth first electrode 101 and the second ends of the Qth first electrode 101 to be connected to the two input ends of the differential amplifier of the processing unit 12 via 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 via a resistor, and the second end of the Qth first electrode 101 can be connected to the inverting input end of the differential amplifier of the processing unit via a resistor, so that the first ends of the Pth first electrode 101 and the Qth first electrode 101 are short-circuited to form a coil loop. After 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 based on the electromagnetic induction receiving signals of each coil loop.

[0169] Similarly, with continued reference to Figures 1 and 4, for example, during the second touch sensing phase, the processing unit 12 provides a first excitation signal to the excitation coil 11, controlling the short circuit between the first ends of the P-th second electrode 102 and the Q-th second electrode 102, and controlling the second ends of the P-th second electrode 102 and the Q-th second electrode 102 to be connected via a resistor to two input terminals of the differential amplifier of the processing unit 12. The second end of the P-th second electrode 102 is connected via a resistor to the non-inverting input terminal of the differential amplifier of the processing unit, while the second end of the Q-th second electrode 102 is connected via a resistor to the inverting input terminal of the differential amplifier of the processing unit. This short circuits the first ends of the P-th second electrode 102 and the Q-th second electrode 102, forming a coil loop. After the first excitation signal ends, the resonant circuit within the electromagnetic pen resonates, and the coil loop generates an electromagnetic induction reception signal based on the resonant signal of the electromagnetic pen, thereby enabling the processing unit to obtain a 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 based on the electromagnetic induction receiving signals of each coil loop.

[0170] 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.

[0171] 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.

[0172] Here is an example of electromagnetic pen touch positioning:

[0173] In the first step, the processing unit provides an excitation signal to the excitation coil. The electromagnetic pen obtains excitation energy and oscillates under stimulation. The excitation coil stops being excited, and the electromagnetic pen resonates (the resonant frequency depends on the LC value inside the pen, and the resonant 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, as well as 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. In the second step, replace the coils. Perform differential amplification, re-amplification, quadrature modulation, integration, and ADC analog-to-digital conversion on the second end of the second first electrode (X2+) and the second end of the fifth first electrode (X5+), and on the second end of the second second electrode (Y2+) and the second end of the fifth second electrode (Y5+). Short the first end of the second first electrode (X2-) and the first end of the fifth first electrode (X5-), and short the first end of the second second electrode (Y2-) and the first end of the fifth second electrode (Y5-), leaving the remaining coils floating. This continues until the coils with the strongest signals in the first and second directions are found. In the third step, obtain the stylus coordinates based on the normal distribution of coil signal energy.

[0174] 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.

[0175] The embodiment of the present disclosure may also determine the touch pressure sensing data or key status data of the electromagnetic pen based on the electromagnetic induction received signal.

[0176] 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 pressurized, 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 pressurized, the C value of the simulated passive electromagnetic pen will also be changed (for example, by connecting a capacitor in parallel), 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 based on the signal frequency.

[0177] Among them, any coil loop corresponding to 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.

[0178] Since the electromagnetic induction signal received by the coil loop can be obtained during the stylus positioning process, the signal frequency of the electromagnetic induction signal received by 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 stylus. In some embodiments, the touch pressure sensing data or key status data can also be transmitted by applying an excitation signal again through the excitation coil.

[0179] 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, 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 is obtained, and the touch pressure data or button status data is determined according to the signal frequency of the electromagnetic induction receiving signal.

[0180] In the disclosed embodiment, after determining the electromagnetic touch position, a second excitation signal is provided to the excitation coil, thereby transmitting an electromagnetic signal to the electromagnetic stylus. After the second excitation signal ends, the electromagnetic stylus's LC resonant circuit resonates. The processing unit then obtains an electromagnetic induction reception signal from any coil loop corresponding to a preset distance range of the electromagnetic stylus touch coordinates in the first or second direction. Based on the second excitation signal, the processing unit determines the frequency of the electromagnetic induction reception signal from the coil loop, and determines the touch pressure sensing data or key status data of the electromagnetic stylus.

[0181] 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 a reference frequency;

[0182] 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.

[0183] As the pressure applied to the stylus tip varies, the inductance or capacitance of the electromagnetic pen's LC resonant circuit changes, causing the resonant signal frequency of the LC resonant circuit to change. This, in turn, affects the frequency of the electromagnetic induction signal received by the coil loop. The coil loop is pre-set with a reference frequency, which simulates the frequency of the LC resonant circuit's resonant signal when the passive electromagnetic pen is unstressed. The frequency of the electromagnetic induction signal is compared with the reference frequency. A greater frequency difference indicates greater pressure sensitivity, thereby acquiring touch pressure data.

[0184] Pressing a button on a simulated passive electromagnetic pen also changes the capacitance of the LC resonant circuit within the pen. For example, when a button is pressed, a capacitor is connected in parallel to the resonant circuit. This change in capacitance causes a change in the frequency of the resonant signal in the LC resonant circuit, which in turn changes the frequency of the electromagnetic induction received signal in the coil loop. The processing unit determines the signal frequency based on the electromagnetic induction received signal from any coil loop corresponding to a preset distance range of the electromagnetic pen touch coordinates in the first or second direction. The processing unit then determines the key status data of the electromagnetic pen based on the signal frequency, for example, by determining that the received signal frequency is within a preset frequency range to determine the status of one or more keys in the simulated passive electromagnetic pen.

[0185] In some embodiments, the processing unit is configured 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;

[0186] providing a third excitation signal to the excitation coil to determine first data to be transmitted by the electromagnetic pen;

[0187] 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;

[0188] Controlling the coil loop formed by the first electrode or the second electrode corresponding to the touch coordinate of the electromagnetic pen to receive the electromagnetic induction receiving signal formed based on the first data to be transmitted and analyzing it to obtain the first data to be transmitted;

[0189] The first data to be transmitted includes at least one of touch pressure sensing data, button status data and electromagnetic pen identification data.

[0190] In the embodiments disclosed herein, a digital passive electromagnetic pen is used as an example for explanation. Compared to analog passive electromagnetic pens, digital passive electromagnetic pens have different circuit structures and data transmission. For example, a digital passive electromagnetic pen includes a resonant circuit, a resonant control circuit, and a pressure-sensitivity digitization circuit.

[0191] A digital passive electromagnetic pen is used for touch control. The excitation coil provides a first excitation signal, and the resonant circuit, resonant control circuit, and pressure-sensing digitization circuit in the electromagnetic pen operate to collect first data to be transmitted. The first data to be transmitted includes at least one of touch pressure-sensing data, key status data, and electromagnetic pen identification data (e.g., electromagnetic pen ID, type, etc.). The first excitation signal can be the excitation signal used to determine the touch position of the electromagnetic pen in the above-mentioned embodiment, or it can be a retransmitted excitation signal. This disclosure does not impose any restrictions on this. The duration of this excitation signal can be longer, and the first data to be transmitted can be collected during the excitation process.

[0192] The processing unit then 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 short excitation and 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 short excitation, medium excitation and long excitation, the first data to be transmitted includes "touch pressure sensing data", "button status data" and "electromagnetic pen identification data", etc. Among them, short excitation is an excitation signal with a shorter duration, medium excitation is an excitation signal with a medium duration, and long excitation is an excitation signal with an actual longer duration.

[0193] After determining the first data to be transmitted, the processing unit provides a fourth excitation signal to the excitation coil, causing the electromagnetic pen to transmit the first data to be transmitted based on the fourth excitation signal. The fourth excitation signal can be a short excitation signal, which causes the electromagnetic pen to transmit the first data to be transmitted, which was previously prepared, to the touch panel. Because the digital passive electromagnetic pen is used, during the transmission of the first data to be transmitted, it can transmit one bit of data for each fourth excitation signal received, or it can send multiple bits of data to the touch panel after receiving a fourth excitation signal.

[0194] The data transmission channel is a coil loop formed by the corresponding first or second electrode when detecting the touch coordinates of the electromagnetic pen. Exemplarily, the coil loop formed by the first electrode represents a coil loop formed by the Pth first electrode and the Qth first electrode; the coil loop formed by the second electrode represents a coil loop formed by the Pth second electrode and the Qth second electrode. This coil loop is controlled to receive an electromagnetic induction reception signal based on the first data to be transmitted and parse it to obtain the first data to be transmitted.

[0195] In some embodiments, the processing unit is configured to:

[0196] 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;

[0197] Acquiring sensing reception signals of the Nth first electrode and the N+1th first electrode;

[0198] Controlling N to increase from 1 to obtain sensing reception signals of all adjacent first electrodes of the touch screen; and determining the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode;

[0199] 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;

[0200] Acquiring sensing reception signals of the Mth second electrode and the M+1th second electrode;

[0201] M is controlled to increase from 1 to obtain 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.

[0202] Continuing to refer to 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 the 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 based on the sensing reception signals of each adjacent first electrode. For example, the sensing received signals of the first first electrode 101 and the second first electrode 101 are obtained, the sensing received signals of the second first electrode 101 and the third first electrode 101 are obtained, the sensing received signals of the third first electrode 101 and the fourth first electrode 101 are obtained, and so on, until the sensing received signals of the Nth first electrode 101 and the N+1th first electrode 101 are obtained. At this point, the sensing received signals of all adjacent first electrodes on the touch screen are obtained. At this point, the sensing received signals of all adjacent first electrodes on the touch screen are obtained. Where N+1 is the number of first electrodes.

[0203] Since the closer the electrode is to the capacitive stylus, the stronger the sensing signal is, the capacitive stylus touch coordinate X in the first direction can be determined by obtaining the strength of the sensing signals of each adjacent first electrode.

[0204] Similarly, when determining the capacitive pen touch coordinate Y in the second direction, the processing unit 12 provides a fifth excitation signal to the excitation coil 11. After the fifth excitation signal excitation ends, the capacitive pen obtains part 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 based on 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. 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, to obtain the sensing reception signal of all adjacent second electrodes 102 on the touch screen; and determine the capacitive pen touch coordinate in the second direction based on the sensing reception signal of each adjacent second electrode 102. For example, the sensing received signals of the first second electrode 102 and the second second electrode 102 are obtained, the sensing received signals of the second second electrode 102 and the third second electrode 102 are obtained, the sensing received signals of the third second electrode 102 and the fourth second electrode 102 are obtained, and so on, until the sensing received signals of the Mth second electrode 102 and the M+1th second electrode 102 are obtained. At this point, the sensing received signals of all adjacent second electrodes of the touch screen are obtained. Wherein, 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 received signals of each adjacent second electrode.

[0205] In summary, the embodiments of the present disclosure can determine the accurate touch position coordinates of the capacitive pen based on the acquired capacitive pen touch coordinates X and Y.

[0206] Exemplarily, the sensing reception signal provided by the embodiment of the present disclosure is a differential signal, and the touch position of the capacitive pen is determined by the differential signal. Continuing to refer to 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 stage, the first end of the first electrode 101 is controlled to be suspended or connected to the reference level, and the second end of the Nth first electrode 101 and the N+1th first electrode 101 are controlled to receive the two input ends of the differential amplifier connected to the 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 the differential signal between the Nth first electrode 101 and the N+1th first electrode 101.

[0207] Similarly, the first end of the second electrode 102 is the Y-terminal (the right side of the second electrode 102), and the second end is the Y+terminal (the left side of the second electrode 102). During the second touch control phase, the first end of the second electrode 102 is controlled to be floating or connected to a reference voltage, 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 via 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 via 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 via a resistor, so as to obtain a differential signal between the Mth second electrode 102 and the M+1th first electrode 101.

[0208] Optionally, as shown in Figure 2, 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 to obtain accurate touch data based on the differential signal calculation. In the embodiment of the present disclosure, the touch data of the capacitive pen is the touch position coordinates.

[0209] In some embodiments, the processing unit is configured 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;

[0210] Obtaining a sensing received signal based on the second data to be transmitted from the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or obtaining a sensing received signal based on the second data to be transmitted from the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction;

[0211] 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 analysis of the sensed received signal.

[0212] 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 the 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.

[0213] The processing unit provides a sixth excitation signal to the excitation coil. The capacitive stylus completes partial or full energy storage via the sixth excitation signal and can transmit the second data to be transmitted after the sixth excitation signal ends. The touch panel receives the second data to be transmitted from the capacitive stylus via the corresponding electrode channel obtained when the capacitive stylus touch position is acquired.

[0214] Therefore, the processing unit obtains a sensing reception signal based on the second data to be transmitted from the Nth first electrode and the N+1th first electrode corresponding to the capacitive pen touch coordinates in the first direction, or obtains a sensing reception signal based on the second data to be transmitted from the Mth second electrode and the M+1th second electrode corresponding to the capacitive pen touch coordinates in the second direction. Based on the sensing reception signal, specific touch data transmitted by the capacitive pen can be parsed, such as at least one of the capacitive pen touch pressure data, key status data, and capacitive pen identification data.

[0215] In some embodiments, Figure 5 is a schematic diagram of switch connections between electrodes and a processing unit in a touch panel provided by an embodiment of the present disclosure. As shown in Figure 5, 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, electrically connected to the ground terminal VSS of the processing unit through the third switch K203, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and electrically connected to the transceiver signal terminal of the processing unit through the fifth switch TR.

[0216] 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, electrically connected to the ground terminal VSS of the processing unit through the third switch K203, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0217] 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, electrically connected to the ground terminal VSS of the processing unit through the third switch K203, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0218] 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K202, electrically connected to the ground terminal VSS of the processing unit through the third switch K203, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K204, and electrically connected to the transceiver signal terminal TR of the processing unit through the fifth switch K205.

[0219] Specifically, each first electrode can be provided with five switches at its first and second ends, electrically connected to corresponding ports of the processing unit; and each second electrode can be provided with five switches at its first and second ends, electrically connected to corresponding ports of the processing unit. By controlling the on and off of multiple switches, different touch control methods can be achieved.

[0220] The first switch K201 is electrically connected to the reference potential terminal VREF of the processing unit to provide a reference potential. The second switch K202 is electrically connected to the drive signal terminal PG of the processing unit to provide a drive signal to the first or second electrode during self-capacitance detection. For example, the drive signal has a sinusoidal or square wave frequency between 10 kHz and 1 MHz. This signal frequency is typically different from the resonant frequency of the stylus to prevent 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 to short-circuit the two electrodes, forming the 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 for transmitting and receiving signals.

[0221] In some embodiments, FIG6 is a schematic diagram of switch connections between electrodes and a processing unit in another touch panel provided by an embodiment of the present disclosure. As shown in FIG6 , the first end of each first electrode is also electrically connected to the transceiver signal terminal of the processing unit via at least one sixth switch K206; the second end of each first electrode is also electrically connected to the transceiver signal terminal of the processing unit via at least one sixth switch K206. The first end of each second electrode is also electrically connected to the transceiver signal terminal of the processing unit via at least one sixth switch K206; the second end of each second electrode is also electrically connected to the transceiver signal terminal of the processing unit via at least one sixth switch K206.

[0222] The sixth switches K206 connected to the same electrode terminal are connected in parallel with each other and with the fifth switch K205 .

[0223] Referring to Figure 6 , for ease of description, the transceiver terminals connected to different switches are named TR1, TR2, TR3, and TR4. For example, the fifth switch K205 is connected to the transceiver terminal TR1, the first sixth switch K206 is connected to the transceiver terminal TR2, the second sixth switch K207 is connected to the transceiver terminal TR3, and the third sixth switch K208 is connected to the transceiver terminal TR4.

[0224] 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, thereby satisfying the touch panel to simultaneously transmit multiple groups of sensing receiving signals to the processing unit, thereby improving the detection speed.

[0225] It should be noted that Figure 6 exemplarily sets four switches to connect to corresponding transceiver terminals, thereby forming four sensing and receiving signal channels. The present disclosure does not limit the specific number of switches, as long as it meets actual needs.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] When the first electrode is used to detect a self-capacitance signal, a mutual-capacitance signal, or a stylus signal, the second end of the first electrode is controlled to be connected to the signal receiving and transmitting end of the processing unit through the fifth switch K205 .

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] Figure 7 is a schematic diagram of a signal detection provided in this embodiment. As shown in Figure 7, the first ends of two 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, which are electrically connected to the corresponding ports of the processing unit.

[0236] 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K12, electrically connected to the ground terminal VSS of the processing unit through the third switch K13, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K14, electrically connected to the transceiver signal terminal TR1 of the processing unit through the fifth switch K15, connected to the transceiver signal terminal TR2 of the processing unit through the first sixth switch K16, connected to the transceiver signal terminal TR3 of the processing unit through the second sixth switch K17, and connected to the transceiver signal terminal TR4 of the processing unit through the third sixth switch K18.

[0237] 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, electrically connected to the drive signal terminal PG of the processing unit through the second switch K22, electrically connected to the ground terminal VSS of the processing unit through the third switch K23, electrically connected to the common potential terminal COM of the processing unit through the fourth switch K24, electrically connected to the transceiver signal terminal TR1 of the processing unit through the fifth switch K25, connected to the transceiver signal terminal TR2 of the processing unit through the first sixth switch K26, connected to the transceiver signal terminal TR3 of the processing unit through the second sixth switch K27, and connected to the transceiver signal terminal TR4 of the processing unit through the third sixth switch K28.

[0238] Therefore, when the first first electrode and the second first electrode are used for touch detection, a differential signal can be obtained by controlling the conduction and shutdown of the corresponding switches, and then subjected to multiple processing such as amplification, orthogonal modulation, and analog-to-digital conversion, so as to obtain accurate touch data based on the differential signal calculation and realize different touch modes.

[0239] The present disclosure further provides a touch system. FIG8 is a schematic structural diagram of a touch system provided by the present disclosure. As shown in FIG8 , the touch system includes a stylus 20 and a touch panel such as any one of the above touch panel embodiments.

[0240] 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.

[0241] The stylus 20 includes an LC resonant circuit. Under the action of an excitation signal, the excitation coil excites the stylus, and the LC resonant circuit in the stylus 20 works. When the stylus 20 works, part or all of the power is provided by the excitation coil of the touch panel.

[0242] In some embodiments, the stylus includes an electromagnetic stylus and / or a capacitive stylus;

[0243] Wherein, the electromagnetic pen includes an active electromagnetic pen or a passive electromagnetic pen;

[0244] The active electromagnetic pen includes a battery and an LC resonance control circuit;

[0245] Passive electromagnetic pens include analog passive electromagnetic pens or digital passive electromagnetic pens;

[0246] The analog passive electromagnetic pen does not contain LC resonance control circuit and pressure sensitivity value digitization circuit;

[0247] The digital passive electromagnetic pen includes an LC resonance control circuit and a pressure sensitivity value digitization circuit;

[0248] The capacitive stylus includes a receiving electrode, a transmitting electrode, and a pressure-sensing value digitizing circuit.

[0249] The stylus includes an electromagnetic pen and a capacitive pen. The touch system provided by the embodiment of the present disclosure is compatible with both electromagnetic pens and capacitive pens. 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 operation comes from the touch screen excitation coil. The passive electromagnetic pen does not require an independent battery, is relatively small in size, and is easy to carry together with the electronic device as a whole, and can bring better operating accuracy and user experience. The power supply in the active electromagnetic pen is used to support other operations of the electromagnetic pen in addition to 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 sensitivity 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.

[0250] 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.

[0251] The present disclosure also provides a method for controlling a touch panel, wherein the touch panel is any one of the touch panel embodiments described above, and the method includes a first touch control stage and a second touch control stage;

[0252] In the first touch stage, a driving signal is provided to the first electrode and the second electrode, and finger touch data is determined according to the sensing received signals of the first electrode and the second electrode;

[0253] In the second touch control stage, an excitation signal is provided to the excitation coil. 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.

[0254] 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.

[0255] In the first touch stage, the finger touches the touch panel, and the processing unit provides a driving signal to the first electrode and the second electrode. The electrodes touched by the finger generate an induction receiving signal. The processing unit can determine the finger touch data, such as touch positioning or other touch instructions, based on the induction receiving signal.

[0256] In the second touch control phase, the stylus performs a touch operation on the touch panel. The processing unit provides an excitation signal to the excitation coil. After the excitation signal stops, the oscillator circuit within the stylus oscillates and outputs a resonant signal to the touch panel. The first and second electrodes generate an induction signal based on the resonant signal of the stylus. The processing unit determines the stylus's touch data, such as touch location or other touch commands, based on the induction signal. Styluses can be categorized as capacitive pens and electromagnetic pens, and the processes by which they generate induction signals differ. The disclosed embodiments are compatible with both types of styluses.

[0257] For example, the order of detecting the first touch stage and the second touch stage can be pre-set. For example, if the first touch stage is performed first and the second touch stage is performed later, it means that the finger touch data is determined first and the touch data of the stylus is obtained later. Stylus touch includes capacitive pen touch and electromagnetic pen touch, so the type of pen can be specifically set in the second touch stage. For example, finger touch is performed first and then electromagnetic pen touch; or finger touch is performed first and then capacitive pen touch; or finger touch, electromagnetic pen touch, and capacitive pen touch are performed in sequence; or the above touch order can be adjusted. In combination with actual operation conditions, users often randomly use different touch methods, and the touch panel can also obtain corresponding touch data according to the actual operation.

[0258] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0259] Get the stylus type trigger signal;

[0260] Determining the capacitive pen touch mode based on the stylus type trigger signal, in the second touch phase, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining the capacitive pen touch data based on the induced received signals of the first electrode and the second electrode;

[0261] Or based on the stylus type trigger signal, it is determined to be an electromagnetic pen touch mode. 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 based on the induced receiving signals of the first electrode and the second electrode.

[0262] Since styluses include capacitive and electromagnetic pens, different types of styluses have different touch modes, and the processing unit's touch detection operations also differ. Therefore, during the second touch detection phase, it is possible to specifically distinguish whether the current touch mode is capacitive or electromagnetic, so as to accurately determine the touch data of the stylus.

[0263] First, a stylus type trigger signal is obtained. For example, this signal is sent to the processing unit by setting a physical button on the screen or through software control. The processing unit can determine the stylus type based on the obtained stylus type trigger signal and then perform touch detection corresponding to the determined stylus type in the second touch detection phase.

[0264] Specifically, if it is determined based on the stylus type trigger signal that the current mode is the 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 the preset communication protocol.

[0265] 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.

[0266] If the electromagnetic pen touch mode is currently in use based on the stylus type trigger signal, in the second touch phase, the processing unit provides a first excitation signal to the excitation coil, controlling the Pth first electrode and the Qth first electrode to form a coil loop. After the first excitation signal ceases, the processing unit obtains an electromagnetic induction reception signal from the coil loop. Specifically, the Pth first electrode and the Qth first electrode should be at least adjacent electrodes, and some electrodes may be separated. However, the number of separated electrodes should be limited, as this will result in an excessively large detection range and inability to accurately determine the electromagnetic pen touch position. After the first excitation signal ceases, if an electromagnetic pen is positioned above the touch screen, the resonant circuit within the electromagnetic pen resonates, and the coil loop formed by the Pth first electrode and the Qth first electrode generates an electromagnetic induction reception signal based on the electromagnetic pen resonant signal. P is incremented from 1 to obtain electromagnetic induction reception signals from the coil loop formed by all first electrodes of the touch screen. Because the electromagnetic induction reception signal corresponding to the location touched by the electromagnetic pen differs from the electromagnetic induction reception signal corresponding to the location not touched by the electromagnetic pen, the electromagnetic pen touch coordinates in the first direction are determined based on the electromagnetic induction reception signals from 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 based on the electromagnetic induction receiving signals of each coil loop, thereby determining the electromagnetic pen touch data, that is, the accurate touch position coordinates of the electromagnetic pen.

[0267] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0268] If the stylus type trigger signal is not obtained within the preset time, in the second touch stage, an excitation signal is provided to the excitation coil. After the excitation signal stops, the 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.

[0269] In an embodiment of the present disclosure, 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 where the processing unit fails to obtain a stylus type trigger signal within a preset time.

[0270] For example, the default mode is the capacitive pen touch mode. If no stylus type trigger signal is obtained within the 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 phase.

[0271] Optionally, if the default mode is the electromagnetic pen touch mode, no stylus type trigger signal is obtained within a preset time, and the user is assumed to touch the touch panel with an electromagnetic pen, the processing unit performs electromagnetic pen touch detection in the second touch phase.

[0272] In some embodiments, in the second touch stage, providing an excitation signal to the excitation coil, and after the excitation signal stops, determining touch data of the stylus according to the induced received signals of the first electrode and the second electrode includes:

[0273] If the stylus type trigger signal is not obtained within the preset time, in the second touch stage, the 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.

[0274] If no stylus type trigger signal is obtained within the preset time and the touch panel is not set to a default mode, the processing unit may perform capacitive pen touch detection and electromagnetic pen touch detection in a time-sharing manner in the second touch phase.

[0275] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0276] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily 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 is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A touch panel, 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; 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.

2. The touch panel according to claim 1, characterized in that: 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 conductive wires is led out from four sides of the touch control area.

3. The touch panel according to claim 2, 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.

4. The touch panel according to claim 1, 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.

5. The touch panel according to claim 1, 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 Determine 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.

6. The touch panel according to claim 5, 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.

7. The touch panel according to claim 1, characterized in that: The processing unit is 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; 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; Determine the electromagnetic pen touch coordinates in the first direction according to the electromagnetic induction receiving signals of each coil loop; 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; 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; 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.

8. The touch panel according to claim 7, 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 Pth second electrode and the Qth second electrode to form a coil loop, and obtains the electromagnetic induction on the coil loop after the first excitation signal stops. The received signal includes: in the second touch stage, providing a first excitation signal to the excitation coil, controlling the first end of the Pth second electrode and the first end of the Qth second electrode to be short-circuited, connecting the second ends of the Pth second electrode and the Qth second electrode to the two input ends of the differential amplifier of the processing unit, so that the Pth second electrode and the Qth second electrode form a coil loop, and obtaining the differential signal between the Pth second electrode and the Qth second electrode after the excitation of the first excitation signal ends.

9. The touch panel according to claim 7, 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.

10. The touch panel according to claim 7, 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.

11. The touch panel according to claim 9 or 10, 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.

12. The touch panel according to claim 7, 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.

13. The touch panel according to claim 1, characterized in that: The processing unit is used for: 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; Acquiring sensing reception signals of the Nth first electrode and the N+1th first electrode; Control N to increase from 1 to obtain the sensing reception signals of all adjacent first electrodes of the touch screen; and determining the capacitive pen touch coordinates in the first direction according to the sensing reception signals of each adjacent first electrode; 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; Acquire sensing reception signals 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; The capacitive pen touch coordinates in the second direction are determined according to the sensing reception signals of each adjacent second electrode.

14. The touch panel according to claim 13, 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.

15. The touch panel according to claim 2, 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, is electrically connected to the common potential end of the processing unit through the fourth 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, 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; 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; 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.

16. The touch panel according to claim 15, 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.

17. An electronic device, characterized in that: Comprising a touch panel as described in any one of claims 1-16.

18. A touch control system, characterized in that: include: A touch pen and a touch panel as claimed in any one of claims 1 to 16; 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.

19. The touch control system according to claim 18, 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.

20. A method for controlling a touch panel, characterized in that: The touch panel is the touch panel according to any one of claims 1 to 16, 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.

21. The method for controlling a touch panel according to claim 20, 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: 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.

22. The method for controlling a touch panel according to claim 20, 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.

23. The control method of the touch panel according to claim 20, 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 control stage, the stylus type trigger signal is sent to the The excitation coil provides an excitation signal, and after the excitation signal stops, the touch data of the capacitive pen and the electromagnetic pen are determined according to the induction receiving signals of the first electrode and the second electrode.

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