Electromagnetic touch driving apparatus, electromagnetic touch screen, electronic device, and touch system

Abstract

Disclosed in embodiments of the present invention are an electromagnetic touch driving apparatus, an electromagnetic touch screen, an electronic device, and a touch system. The electromagnetic touch screen comprises a plurality of first driving electrodes arranged in a first direction, and the plurality of first driving electrodes are coupled to each other at one end. The electromagnetic touch driving apparatus comprises a plurality of first driving ends used for respectively outputting first driving voltages to the other ends of the plurality of first driving electrodes. Any two first driving electrodes form a driving coil, and part of each driving coil generates a current to generate an electromagnetic field, so that the position of an electromagnetic stylus is sensed by sensing the change of the electromagnetic field caused by the electromagnetic stylus on the electromagnetic touch screen. The electromagnetic touch driving apparatus operates in different driving stages. In each driving stage, the current directions in the driving coils that generate currents are the same, so that phase reversal of a voltage signal received when the electromagnetic stylus is sensed by the electromagnetic touch screen can be avoided, thereby improving the accuracy of electromagnetic stylus position detection.

Description

Electromagnetic touch drive device, electromagnetic touch screen, electronic equipment and touch system Technical Field

[0001] This application relates to the field of electromagnetic touch technology, and in particular to an electromagnetic touch driving device, an electromagnetic touch screen, an electronic device, and a touch system. Background Technology

[0002] EMR (Electro Magnetic Resonance) technology is mainly used in digital tablets, e-ink displays, and other similar applications. It offers advantages such as high precision, a comfortable writing experience, and good stability.

[0003] Currently, EMR technology is gradually being applied to mobile phones and tablets to sense the position of an electromagnetic pen on the screen, thereby detecting user input. Multiple parallel driving electrodes are located in or below the touchpad to provide driving signals, and multiple sensing electrodes perpendicular to the driving electrodes are located to sense the pen's position based on changes in the sensed electromagnetic field. Because mobile phones and tablets have narrow screen bezels, shorting the ends of the driving and sensing electrodes on the same side of the touchscreen can significantly reduce the number of outgoing wires. However, when driving the driving electrodes, the presence of parasitic capacitance between the electrodes and system ground generates current flowing back from the driving electrodes to system ground through the parasitic capacitance. This often results in an unstable envelope of voltage or current sensed when the electromagnetic pen slides on the screen, leading to inaccurate pen position detection.

[0004] Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This invention provides an electromagnetic touch driving device, an electromagnetic touch screen, an electronic device, and a touch system, which can improve the accuracy of electromagnetic pen position detection.

[0007] In a first aspect, embodiments of the present invention provide an electromagnetic touch driving device for coupling to an electromagnetic touch screen, the electromagnetic touch screen including a plurality of first driving electrodes arranged along a first direction, one end of the plurality of first driving electrodes being coupled to each other, the electromagnetic touch driving device including:

[0008] Multiple first driving terminals are provided for outputting a first driving voltage to the other end of the multiple first driving electrodes, wherein any two first driving electrodes constitute a driving coil, and a current is generated in a portion of the driving coils to generate an electromagnetic field, thereby sensing the position of the electromagnetic pen by sensing the change in the electromagnetic field caused by the electromagnetic pen on the electromagnetic touch screen, wherein the electromagnetic touch driving device operates in driving stages, and the first driving terminals ensure that the current direction in each driving coil that generates the current is consistent in each driving stage.

[0009] In this embodiment, the electromagnetic touch driving device outputs a first driving voltage to multiple first driving electrodes of the electromagnetic touch screen through multiple first driving terminals. Under the action of the first driving voltage, current is generated in a portion of the driving coil formed by two first driving electrodes to produce an electromagnetic field. When the electromagnetic pen is placed in the area corresponding to the driving coil, it causes a change in the electromagnetic field of that area. Therefore, the position of the electromagnetic pen can be sensed by sensing the change in the electromagnetic field of the corresponding area. The electromagnetic touch driving device operates in driving stages and controls the first driving voltage output by the first driving terminals to ensure that the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change in the electromagnetic field sensed by the electromagnetic touch screen is consistent, thereby avoiding the voltage signal being out of phase when the electromagnetic touch screen senses the electromagnetic pen, and improving the accuracy of electromagnetic pen position detection.

[0010] In one possible implementation, the electromagnetic touch driving device further includes a plurality of first driving sources respectively coupled to the plurality of first driving terminals, for outputting a plurality of first driving voltages to the plurality of first driving terminals respectively, wherein, in the i-th driving stage, the plurality of first driving sources respectively output equal positive first driving voltages to the i-th first driving terminals, and the plurality of first driving sources respectively output equal negative first driving voltages to the remaining first driving terminals.

[0011] In this implementation, each driving stage has a corresponding region with the highest electromagnetic field strength, and this corresponding region shifts along the first direction as the driving stage jumps, thereby enabling the position of the electromagnetic pen to be determined by sensing the changes in the electromagnetic field at different times.

[0012] In one possible implementation, the electromagnetic touch driving device further includes a plurality of first driving sources respectively coupled to the plurality of first driving terminals, for outputting a plurality of first driving voltages to the plurality of first driving terminals respectively, wherein the plurality of first driving voltages decrease sequentially along the arrangement direction of the plurality of first driving terminals, and in the i-th driving stage, the difference between the i-th first driving voltage and the (i+1)-th first driving voltage along the arrangement direction is greater than the difference between any other first driving voltage and the next first driving voltage.

[0013] In this implementation, each driving stage has a corresponding region with the highest electromagnetic field strength, and this corresponding region shifts along the first direction as the driving stage jumps, thereby enabling the position of the electromagnetic pen to be determined by sensing the changes in the electromagnetic field at different times.

[0014] In one possible implementation, the electromagnetic touch screen further includes a plurality of second driving electrodes arranged along a second direction, one end of each of the plurality of second driving electrodes being coupled to each other, the second direction being perpendicular to the first direction; the electromagnetic touch driving device further includes a plurality of second driving ends and a plurality of second driving sources, the plurality of second driving ends being used to output a second driving voltage to the other end of each of the plurality of second driving electrodes, and the plurality of second driving sources being used to output a plurality of second driving voltages to each of the plurality of second driving ends; the driving stage includes a first driving stage and a second driving stage;

[0015] In the first driving phase, the i-th first driving voltage output by the i-th first driving source to the i-th first driving terminal is greater than the i+1-th first driving voltage output by the (i+1)-th first driving source to the (i+1)-th first driving terminal; in the second driving phase, the i-th second driving voltage output by the i-th second driving source to the i-th second driving terminal is greater than the i+1-th second driving voltage output by the (i+1)-th second driving source to the (i+1)-th second driving terminal.

[0016] In this implementation, by driving two different dimensions of driving electrodes in two driving stages, coordinate information in two dimensions can be collected to calculate the coordinate position of the electromagnetic pen.

[0017] In one possible implementation, the electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively.

[0018] In one possible implementation, the driving phase includes a first sub-phase and a second sub-phase, and the charging capacitor includes a first charging capacitor and a second charging capacitor, the first charging capacitor and the second charging capacitor having opposite polarities; in the first sub-phase of the i-th driving phase, the anode and cathode of the first charging capacitor are respectively coupled to the i-th first driving terminal and the (i+1)-th first driving terminal; in the second sub-phase of the i-th driving phase, the anode and cathode of the second charging capacitor are respectively coupled to the i-th first driving terminal and the (i+1)-th first driving terminal.

[0019] In one possible implementation, the electromagnetic touch driving device further includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a driving switching circuit corresponding to each of the first driving electrodes. The driving switching circuit includes a first switch and a second switch. In the first sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple the positive terminal of the first charging capacitor to the i-th first driving terminal, and the second single-pole double-throw switch and the second switch couple the negative terminal of the first charging capacitor to the (i+1)-th first driving terminal. A single-pole double-throw switch couples the negative terminal of the second charging capacitor to a reference voltage, and a fourth single-pole double-throw switch grounds the positive terminal of the second charging capacitor; in the second sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple the positive terminal of the second charging capacitor to the i-th first driving terminal, the second single-pole double-throw switch and the second switch couple the negative terminal of the second charging capacitor to the (i+1)-th first driving terminal, the third single-pole double-throw switch couples the positive terminal of the first charging capacitor to the reference voltage, and the fourth single-pole double-throw switch grounds the negative terminal of the first charging capacitor.

[0020] In one possible implementation, the driving phase includes a first sub-phase and a second sub-phase; in the first sub-phase of the i-th driving phase, the positive and negative terminals of the charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively; in the second sub-phase of the i-th driving phase, each of the first driving terminals is grounded.

[0021] In one possible implementation, the driving phase includes h sub-phases, and the charging capacitor includes h charging capacitors with different charging capacities, where h is a positive integer greater than 2; in the k-th sub-phase of the i-th driving phase, the positive and negative terminals of the k-th charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively, where k is a positive integer less than or equal to h.

[0022] In one possible implementation, the electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are coupled to the i-th first driving terminal and the (i+m)-th first driving terminal, respectively, where m is a positive integer greater than or equal to 2.

[0023] In one possible implementation, the electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are coupled to the p-th first driving terminal and the p+q-th first driving terminal, respectively, where p is a positive integer and is different in each driving stage, and q is a positive integer and is different in each driving stage, and each first driving terminal is coupled to the charging capacitor at least in one driving stage.

[0024] In one possible implementation, the number of the first driving terminals is M, and the electromagnetic touch driving device further includes M / 2 charging capacitors. The driving stage includes a first sub-stage and a second sub-stage, where M is an even number. In the first sub-stage, one end of the i-th charging capacitor is coupled to the (2i-1)-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, where i is a positive integer less than or equal to M / 2. In the second sub-stage, one end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the (2i+1)-th first driving terminal.

[0025] In one possible implementation, the number of the first driving terminals is M, and the electromagnetic touch driving device further includes M / 2r charging capacitors. The driving stage includes a first sub-stage and a second sub-stage, where M is an even number. In the first sub-stage, one end of the i-th charging capacitor is coupled to the 2ri-2r+1-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri-r+1-th first driving terminal, where i is a positive integer less than or equal to M / 2r. In the second sub-stage, one end of the i-th charging capacitor is coupled to the 2ri-r+1-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri+1-th first driving terminal.

[0026] In one possible implementation, the electromagnetic touch driving device further includes a plurality of charging capacitors, and the driving stage includes a first sub-stage and a second sub-stage; in the first sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first driving terminals that have not yet been coupled to the first i-1 charging capacitors, the first x first driving terminals are selected, one end of the i-th charging capacitor is coupled to the first first driving terminal of the x first driving terminals, and the other end of the i-th charging capacitor is coupled to the last first driving terminal of the x first driving terminals;

[0027] In the second sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first driving terminals that have not yet been coupled to the first i-1 charging capacitors and have not been coupled to the first sub-stage, the first y first driving terminals are selected, one end of the i-th charging capacitor is coupled to the first first driving terminal of the y first driving terminals, and the other end of the i-th charging capacitor is coupled to the last first driving terminal of the y first driving terminals.

[0028] In a second aspect, embodiments of the present invention provide an electromagnetic touch screen, including the electromagnetic touch driving device in the first aspect or any possible implementation of the first aspect; and a plurality of first driving electrodes arranged along a first direction, one end of the plurality of first driving electrodes being coupled to each other, and the other end of the plurality of first driving electrodes being coupled to the electromagnetic touch driving device.

[0029] In one possible implementation, a plurality of sensing coils arranged along a second direction perpendicular to the first direction are further included, wherein the position of the electromagnetic pen is sensed by sensing changes in the electromagnetic field within each of the sensing coils.

[0030] Thirdly, embodiments of the present invention provide an electronic device including the electromagnetic touch screen described in the second aspect or any possible implementation thereof.

[0031] Fourthly, embodiments of the present invention provide a touch system, including the electromagnetic touch screen described in the third aspect above, and an electromagnetic pen.

[0032] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0033] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0034] Figure 1 is a schematic diagram of the electrode structure of the touch screen provided in an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the structure of the touch screen provided in an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of the electrode structure of a touch screen provided in another embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the loop current and magnetic field direction for the touch screen in Figure 1 to drive electrodes Tx1 and Tx2.

[0038] Figure 5 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram of the structure of an electromagnetic touch driving device provided in an embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of the structure of the driving source provided in an embodiment of the present invention;

[0041] Figure 8 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in another embodiment of the present invention;

[0042] Figure 9 is a schematic diagram of the structure of an electromagnetic touch driving device provided in another embodiment of the present invention;

[0043] Figure 10 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen according to another embodiment of the present invention.

[0044] Figure 11 is a schematic diagram of the driving effect of an electromagnetic touch drive device provided in an embodiment of the present invention using a charging capacitor to drive an electromagnetic touch screen.

[0045] Figure 12 is a schematic diagram of the structure of an electromagnetic touch driving device provided in another embodiment of the present invention;

[0046] Figure 13 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in an embodiment of the present invention, which is obtained by modifying the embodiment in Figure 11.

[0047] Figure 14 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided by another embodiment of the present invention, which is obtained by modifying the embodiment of Figure 11.

[0048] Figure 15 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in an embodiment of the present invention, which is obtained by modifying the embodiment in Figure 14.

[0049] Figure 16 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided by another embodiment of the present invention, which is obtained by modifying the embodiment of Figure 11.

[0050] Figure 17 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in another embodiment of the present invention;

[0051] Figure 18 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in an embodiment of the present invention, which is obtained by modifying the embodiment of Figure 17.

[0052] Figure 19 is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in an embodiment of the present invention, which is obtained by modifying the embodiment of Figure 17 or Figure 18.

[0053] Specific implementation method

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0055] EMR (Electromagnetic Resonance) technology, also known as electromagnetic handwriting technology, is currently mainly used in graphics tablets and e-ink displays. It boasts advantages such as high precision, a seamless writing experience, and good stability. EMR technology is also increasingly being applied to mobile phones and tablets to sense the position of an electromagnetic pen, thereby detecting user input. The touchscreen has multiple electrodes arranged in alternating rows and columns, including multiple horizontally arranged driving electrodes and multiple vertically arranged sensing electrodes. The driving coils formed by the driving electrodes generate current under the influence of a driving voltage, creating an electromagnetic field in the corresponding area of ​​the driving coil. The sensing electrodes connect to form sensing coils, which sense changes in the electromagnetic field caused by the electromagnetic pen on the touchscreen, thus detecting the pen's position. The number of driving electrodes and sensing electrodes on the touchscreen can be set based on the touchscreen size and touch detection requirements, for example, forming a 20x40 electrode array or a 40x40 electrode array. Generally, the driving electrodes on the touchscreen of products such as graphics tablets and e-ink screens form multiple independent driving coils, and the sensing electrodes on the touchscreen form multiple independent sensing coils. However, due to the narrow bezels of mobile phones or tablets, connecting the driving and sensing electrodes of the touchscreen into a comb-like structure, that is, connecting their ends on the same side together, can greatly reduce the number of outgoing wires on the touchscreen. For example, as shown in Figure 1, the upper ends of the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn on the touchscreen are connected together, and the left ends of the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn on the touchscreen are connected together. It is understandable that, in the process of implementing touch detection, the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn can be used as driving electrodes, and the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn can be used as sensing electrodes; alternatively, the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn can be used as driving electrodes, and the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn can be used as sensing electrodes.

[0056] Furthermore, touchscreens in electronic devices such as mobile phones and tablets generally integrate capacitive sensing technology. The electrodes used for capacitive touch sensing and those used for electromagnetic touch sensing can be both compatible and separate. When the electrodes used for capacitive touch sensing and those used for electromagnetic touch sensing are separate, they can be placed on different layers of the touchscreen structure. For example, as shown in Figure 2, the electrodes used for capacitive touch sensing are placed on the capacitive sensing layer 110 above the display layer 120, and the electrodes used for electromagnetic touch sensing are placed on the electromagnetic sensing layer 130 below the display layer 120. When the electrodes used for capacitive touch sensing and those used for electromagnetic touch sensing are compatible, the compatibility scheme can be shown in Figure 3. In the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn on the touchscreen, the upper ends of any two adjacent electrodes are connected by a switch; the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ... In electrodes Rx0 and Rxn, the left ends of any two adjacent electrodes are connected by a switch. That is: the upper end of electrode Tx0 is connected to the upper end of electrode Tx1 via switch Kt1, the upper end of electrode Tx1 is connected to the upper end of electrode Tx2 via switch Kt2, the upper end of electrode Tx2 is connected to the upper end of electrode Tx3 via switch Kt3, ..., the upper end of electrode Txn-1 is connected to the upper end of electrode Txn via switch Ktn; the left end of electrode Rx0 is connected to the left end of electrode Rx1 via switch Kr1, the left end of electrode Rx1 is connected to the left end of electrode Rx2 via switch Kr2, the left end of electrode Rx2 is connected to the left end of electrode Rx3 via switch Kr3, ..., the left end of electrode Rxn-1 is connected to the left end of electrode Rxn via switch Krn. When all the switches in Figure 3 are closed, the electrodes on the touch screen are used to realize electromagnetic touch detection; when all the switches are open, the electrodes on the touch screen are used to realize capacitive touch detection.

[0057] However, when driving the electrodes in a touchscreen to achieve electromagnetic touch detection, the presence of parasitic capacitance between the electrodes and the system ground generates a current flowing back from the driving electrode to the system ground through the parasitic capacitance. This often results in electromagnetic signals of opposite directions being generated in different areas of the touchscreen at the same corresponding moment. This causes the voltage detected by the electromagnetic pen to be out of phase at different positions, making the detection and positioning of the electromagnetic pen complex, and it may even be impossible to calculate the coordinates. Alternatively, it may cause the voltage or current sensed by the electromagnetic pen when sliding on the screen to fail to generate a stable envelope, resulting in inaccurate position detection of the electromagnetic pen. For example, referring to Figure 4, when the driving source S drives the driving coil composed of electrodes Tx1 and Tx2, when the driving source S provides a driving voltage Vs+ to electrode Tx1 and electrode Tx2 is grounded, a current loop is generated from the driving source S to electrode Tx1 to electrode Tx2 to ground. The current direction of this current loop is clockwise, so the magnetic field generated between electrode Tx1 and electrode Tx2 is in the direction of the touchscreen inward. At this time, electrode Tx0 can be grounded or floating. If electrode Tx0 is grounded, under the action of driving source S, a current loop will be generated simultaneously from driving source S to electrode Tx1 to electrode Tx0 to ground. The current direction of this current loop is counterclockwise, so the magnetic field generated between electrode Tx1 and electrode Tx0 is in the direction of the touch screen outward. If electrode Tx0 is floating, due to the parasitic capacitance CL between electrode Tx0 and system ground, under the action of driving source S, a current loop will also be generated from driving source S to electrode Tx1 to the parasitic capacitance CL of electrode Tx0 to ground. The current direction of this current loop is counterclockwise, so the magnetic field generated between electrode Tx1 and electrode Tx0 is in the direction of the touch screen outward. When the electrodes in the touchscreen are driven, the situation shown in Figure 4 occurs. The magnetic field direction sensed by the electromagnetic pen placed in the area between electrodes Tx0 and Tx1 is different from that sensed by the area placed between electrodes Tx1 and Tx2. This causes the voltage signal detected by the sensing coil composed of the touchscreen's sensing electrodes to be out of phase, making the detection and positioning of the electromagnetic pen complex. In some cases, when the electromagnetic pen is placed on electrode Tx1, the sensing coil cannot detect the voltage signal, making it impossible to calculate the coordinates of the electromagnetic pen. Furthermore, once the electromagnetic pen slides across electrode Tx1, it causes a jump in the sensed electromagnetic field. The change in the sensed electromagnetic field detected when the electromagnetic pen slides is no longer monotonically increasing or decreasing, causing the voltage or current sensed when the electromagnetic pen slides on the screen to fail to generate a stable envelope, resulting in inaccurate electromagnetic pen position detection.

[0058] Based on this, embodiments of the present invention provide an electromagnetic touch driving device, an electromagnetic touch screen, an electronic device, and a touch system, which can improve the accuracy of electromagnetic pen position detection.

[0059] It should be noted that when using the electrode configuration shown in Figure 1 or Figure 3 to implement touch detection of the electromagnetic pen on a touchscreen, different driving and detection methods are possible. For example, the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn can be used only as driving electrodes, while the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn can be used only as sensing electrodes. By polling and driving multiple driving electrodes in sequence, all sensing electrodes simultaneously collect signals during each drive. After all driving electrodes have completed one round of polling and driving, the collected sensing signals are combined with the driving signals of the driving electrodes to calculate the coordinates of the electromagnetic pen. Moreover, this polling driving method can achieve multi-point detection on the touchscreen. Alternatively, the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn can be used only as sensing electrodes in the first time period. Electrodes Rx0, Rx1, Rx2, Rx3, ..., and Rxn are used as driving electrodes, providing driving signals to them. During the first time period, the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ..., and Rxn are simultaneously used as sensing electrodes, acquiring sensing signals to obtain coordinate information in one dimension. During the second time period, the horizontally arranged electrodes Rx0, Rx1, Rx2, Rx3, ..., and Rxn are used as driving electrodes, providing driving signals to them. During the second time period, the vertically arranged electrodes Tx0, Tx1, Tx2, Tx3, ..., and Txn are simultaneously used as sensing electrodes, acquiring sensing signals to obtain coordinate information in another dimension. Finally, by combining the coordinate information obtained in the first and second time periods, the coordinate position of the electromagnetic pen is calculated.

[0060] The first aspect of the present invention provides an electromagnetic touch driving device. In the two different driving and detection methods described above, the voltage signal received when the electromagnetic touch screen senses the electromagnetic pen is reversed, thereby improving the accuracy of electromagnetic pen position detection. The following describes the device with different embodiments.

[0061] Referring to Figure 5, which is a schematic diagram of the driving effect of an electromagnetic touch screen on an electromagnetic touch screen provided by an embodiment of the present invention, the electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, such as first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn, wherein the first driving electrode Tx0 is the first first driving electrode arranged along the first direction, ..., and the first driving electrode Txn is the (n+1)th first driving electrode arranged along the first direction; one end of the plurality of first driving electrodes is coupled to each other, for example, the upper ends of the first driving electrodes Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn are coupled to each other, so that the plurality of first driving electrodes of the electromagnetic touch screen are connected to form a comb-like structure. In Figure 5, the first direction is vertical, but in other embodiments, the first direction can also be horizontal. In Figure 5, the upper ends of the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3, ... and the first driving electrode Txn are coupled to each other. In other embodiments, the lower ends of the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3, ... and the first driving electrode Txn can also be coupled to each other.

[0062] The electromagnetic touch driving device includes multiple first driving terminals for outputting a first driving voltage. Within each sensing cycle, the electromagnetic touch driving device drives sequentially in the order of driving stage 1, driving stage 2, ..., driving stage n-1, driving stage n. The sensing cycle refers to the time required to sense the coordinate position of the electromagnetic pen. Sensing the coordinate position of the electromagnetic pen is achieved by polling multiple driving electrodes, with each sensing electrode simultaneously acquiring signals during polling. The time for polling each driving electrode is called a driving stage. One sensing cycle includes multiple driving stages. After polling all the multiple driving electrodes, based on the sensing results of each sensing electrode in each driving stage, the coordinate position of the electromagnetic pen can be sensed once, thus completing one sensing cycle. Since the coordinate position of the electromagnetic pen is constantly changing, in the next sensing cycle, the coordinate position of the electromagnetic pen in the next sensing cycle is sensed again through multiple driving stages.

[0063] Note that, as shown in Figure 5, in each driving stage, the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3, ... and the first driving electrode Txn are driven simultaneously. Specifically:

[0064] In driving phase 1: First driving electrodes Tx1, Tx2, Tx3, ..., and Txn are each coupled to a first driving terminal. The lower end of the first driving electrode Tx0 receives a positive first driving voltage Vs provided by the first driving terminal coupled to the first driving electrode Tx0. At the same time, the lower ends of the first driving electrodes Tx1, Tx2, Tx3, ..., and Txn receive a negative first driving voltage -Vs through the first driving terminal coupled to each of the first driving electrodes Tx1, Tx2, Tx3, ..., and Txn respectively.

[0065] In driving phase 2: the lower ends of the first driving electrodes Tx0 and Tx1 simultaneously receive a positive first driving voltage Vs provided by the first driving terminals coupled to the first driving electrodes Tx0 and Tx1, respectively. Simultaneously, the lower ends of the first driving electrodes Tx2, Tx3, ... and Txn simultaneously receive a negative first driving voltage -Vs through the first driving terminals coupled to their respective first driving terminals. ...

[0066] In driving phase n-1: the lower ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn-2 simultaneously receive a positive first driving voltage Vs provided by the first driving terminal coupled to the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn-2, respectively. At the same time, the lower ends of the first driving electrodes Txn-1 and Txn simultaneously receive a negative first driving voltage -Vs through the first driving terminal coupled to the first driving electrodes Txn-1 and Txn, respectively.

[0067] In the driving phase n: the lower ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn-1 simultaneously receive a positive first driving voltage Vs provided by the first driving terminal coupled to the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn-1, respectively. At the same time, the lower end of the first driving electrode Txn receives a negative first driving voltage -Vs through the first driving terminal coupled to the first driving electrode Txn.

[0068] It is understandable that in the aforementioned driving stage 1, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Tx1 generates a clockwise current under the action of the positive first driving voltage Vs and the negative first driving voltage -Vs, thereby generating an electromagnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx1. Similarly, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Tx2 generates a clockwise current under the action of the positive first driving voltage Vs and the negative first driving voltage -Vs, thereby generating an electromagnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx2. Moreover, the region where the electromagnetic field is generated between the first driving electrode Tx0 and the first driving electrode Tx2 includes the region where the electromagnetic field is generated between the first driving electrode Tx0 and the first driving electrode Tx1. The cases of the first driving electrodes Tx0 and Tx3, ..., and the first driving electrodes Tx0 and Txn are similar to those of the first driving electrodes Tx0 and Tx2. Therefore, under the superposition of electromagnetic fields in all regions, the electromagnetic field strength is greatest in the region between the first driving electrodes Tx0 and Tx1 in the driving stage 1 described above. Correspondingly, the electromagnetic field strength is greatest in the region between the first driving electrodes Tx1 and Tx2 in the driving stage 2 described above; ..., the electromagnetic field strength is greatest in the region between the first driving electrodes Txn-2 and Txn-1 in the driving stage n described above, and the electromagnetic field strength is greatest in the region between the first driving electrodes Txn-1 and Txn in the driving stage n described above.

[0069] Furthermore, it should be noted that in the aforementioned driving stages, some driving coils composed of two first driving electrodes do not generate current. Examples include the driving coil composed of first driving electrodes Tx1 and Tx2 in driving stage 1, the driving coil composed of first driving electrodes Tx2 and Tx3 in driving stage 1, ..., and the driving coil composed of first driving electrodes Txn-1 and Txn in driving stage 1. Since the two first driving electrodes of these driving coils receive the same first driving voltage (-Vs), no current is generated in these driving coils. Similarly, in driving stage 2, the driving coil composed of first driving electrodes Tx0 and Tx1 also does not generate current because the two first driving electrodes receive the same first driving voltage (Vs). The same applies to other driving coils where the two first driving voltages are the same.

[0070] The electromagnetic touchscreen includes n+1 first driving electrodes. A complete sensing cycle requires n drives, each corresponding to one of the driving stages described above, with each stage lasting the same duration. During each driving stage, all sensing electrodes of the electromagnetic touchscreen simultaneously acquire signals. At the end of a sensing cycle, after all driving electrodes have completed a full cycle of driving, the acquired sensing signals are combined with the driving signals from the driving electrodes to calculate the coordinates of the electromagnetic pen.

[0071] As shown in Figure 5, the electromagnetic touch driving device provided in this embodiment of the invention is coupled to an electromagnetic touch screen. The electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction. One end of the plurality of first driving electrodes is coupled to each other. The electromagnetic touch driving device includes a plurality of first driving ends, which are used to output a first driving voltage to the other end of the plurality of first driving electrodes respectively. Any two first driving electrodes constitute a driving coil. A current is generated in a portion of the driving coils to generate an electromagnetic field. The position of the electromagnetic pen is sensed by sensing the change in the electromagnetic field caused by the electromagnetic pen on the electromagnetic touch screen. The electromagnetic touch driving device operates in driving stages, and the first driving ends ensure that the current direction in each driving coil that generates current is consistent in each driving stage.

[0072] In this embodiment, the electromagnetic touch driving device outputs a first driving voltage to multiple first driving electrodes of the electromagnetic touch screen through multiple first driving terminals. Under the action of the first driving voltage, current is generated in a portion of the driving coil formed by two first driving electrodes, thus generating an electromagnetic field. When the electromagnetic pen is placed in the area corresponding to the driving coil, it causes a change in the electromagnetic field of that area. Therefore, the position of the electromagnetic pen can be sensed by sensing the change in the electromagnetic field of the corresponding area. The electromagnetic touch driving device operates in driving stages and controls the first driving voltage output by the first driving terminals to ensure that the current direction in each driving coil is consistent in each driving stage. Therefore, the change in the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding signal reversal in the same driving stage and improving the accuracy of electromagnetic pen position detection.

[0073] When there are multiple first driving terminals, referring to Figure 5, S0, S1, S2, S3, ..., Sn represent the first driving sources corresponding to the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn, respectively. As mentioned above, each first driving terminal corresponds to one first driving electrode, but not necessarily each first driving source corresponds to one first driving electrode. There can be multiple first driving sources, that is, each first driving source corresponds to one first driving electrode. However, there can also be only two first driving sources, or only one.

[0074] Figure 5 illustrates the case where each first driving source corresponds to one first driving electrode. In Figure 5, each first driving electrode Tx1, Tx2, Tx3, ..., Txn is coupled to a different first driving source S0, S1...Sn. In driving phase 1, the first driving source S0 coupled to the first driving electrode Tx0 provides a positive first driving voltage Vs, and the first driving sources S1, S2...Sn coupled to the first driving electrodes Tx1, Tx2, Tx3, ..., Txn respectively provide negative first driving voltages -Vs. In driving phase 2, the first driving electrodes Tx0 and Tx2...Sn ... The first driving sources S0 and S1, respectively coupled to x1, provide a positive first driving voltage Vs. The first driving electrodes Tx2, Tx3, ... and Txn, respectively coupled to the first driving sources S2...Sn, provide a negative first driving voltage -Vs... In driving phase n-1, the first driving electrodes Tx0, Tx1...Txn-2, respectively coupled to the first driving sources S0, S1...Sn-2, provide a positive first driving voltage Vs. The first driving electrodes Txn-1 and Txn, respectively coupled to the first driving sources Sn-1 and Sn, provide a negative first driving voltage -Vs. In driving phase n, the first driving electrodes Tx0, Tx1...Txn-1, respectively coupled to the first driving sources S0, S1...Sn-1, provide a positive first driving voltage Vs. The first driving electrode Txn, respectively coupled to the first driving source Sn, provides a negative first driving voltage -Vs.

[0075] As shown in Figure 6, there are two first driving sources: a first positive driving source S+ and a first negative driving source S-, which output a positive first driving voltage Vs and a negative first driving voltage -Vs, respectively. Specifically, the first positive driving source S+ outputs a positive first driving voltage Vs, and the first negative driving source S- outputs a negative first driving voltage -Vs.

[0076] The electromagnetic touch control device drives the electrodes sequentially in the order of driving stage 1, driving stage 2, ..., driving stage n-1, and driving stage n. In each driving stage, the first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ..., and first driving electrode Txn are driven simultaneously. The operation of the first positive driving source S+ and the first negative driving source S- in each driving stage is as follows:

[0077] For the first driving stage, the first positive driving source S+ outputs a positive first driving voltage Vs to the first first driving electrode Tx0 through the first driving terminal qd0, and the first negative driving source S- outputs a negative first driving voltage -Vs to the remaining first driving electrodes Tx1-Txn through the first driving terminals qd1-qdn;...

[0078] For the i-th driving stage, the first positive driving source S+ outputs a positive first driving voltage Vs to the first i first driving electrodes Tx0-Tx(i-1) through the first driving terminal qd0-qd(i-1), and the first negative driving source S- outputs a negative first driving voltage -Vs to the remaining first driving electrodes Txi-Txn through the first driving terminal qdi-qdn, where i is a positive integer, 1≤i≤n;...

[0079] For the nth driving stage, the first positive driving source S+ outputs a positive first driving voltage Vs to the first n first driving electrodes Tx0-Tx(n-1) through the first driving terminal qd0-qd(n-1), and the first negative driving source S- outputs a negative first driving voltage -Vs to the last first driving electrode Txn through the first driving terminal qdn.

[0080] After the nth driving phase ends, a sensing cycle ends.

[0081] In this embodiment, in the i-th driving stage, the first positive driving source S+ among the plurality of first driving sources outputs an equal positive first driving voltage Vs to the i-th first driving terminals, thereby outputting a positive first driving voltage Vs to the i-th first driving electrodes arranged along the first direction; the first negative driving source S- among the plurality of first driving sources outputs an equal negative first driving voltage -Vs to the remaining first driving terminals, thereby outputting a negative first driving voltage -Vs to the remaining first driving electrodes arranged along the first direction; thus, in each driving stage, the current direction in each driving coil that generates current is consistent, so the change in the electromagnetic field sensed by the electromagnetic touch screen is consistent, thereby avoiding the signal inversion sensed by the electromagnetic touch screen in the same driving stage, and improving the accuracy of electromagnetic pen position detection.

[0082] In addition, for the i-th driving stage, the first i first driving electrodes arranged along the first direction share the first positive driving source S+, and the remaining n+1-i first driving electrodes arranged along the first direction share the first negative driving source S-, so that the electromagnetic touch driving device only needs to be configured with two first driving sources to meet the driving requirements, thus saving the number of driving sources.

[0083] The case where there is only one first driving source is not shown. In this case, the first driving source is coupled with an inverter. This first driving source is equivalent to the first positive driving source S+ in Figure 6. The first driver plus the inverter is equivalent to the first negative driving source S- in Figure 6. Therefore, the working process when there is only one first driving source can be referred to the working process when there are only two first driving sources as described above in conjunction with Figure 6, and will not be repeated here.

[0084] It is understandable that each of the first driving electrodes of the electromagnetic touch screen provides a first driving voltage as a first driving source, which is located in the electromagnetic touch driving device.

[0085] Referring to Figure 7, which is a schematic diagram of the driving source, the driving source includes a digital-to-analog converter (DAC), an operational amplifier (Gain), a low-pass filter (LPF), and a buffer amplifier. First, the DAC generates the required driving waveform, such as a sine wave, square wave, or triangle wave. Then, the operational amplifier (Gain) amplifies the driving waveform to the required voltage amplitude. Next, the low-pass filter (LPF) filters out interference signals, and finally, the buffer amplifier (Buffer) enhances the driving capability, outputting the driving voltage. Since the first driving source needs to simultaneously provide the first driving voltage to multiple first driving electrodes, the structure shown in Figure 7 is adopted. This structure provides good driving capability and ensures high consistency in the waveform, frequency, phase, and amplitude of the first driving voltage simultaneously obtained by multiple first driving electrodes, preventing voltage distortion.

[0086] Referring to Figure 8, which is a schematic diagram of the driving effect of an electromagnetic touch screen by an electromagnetic touch driving device according to another embodiment of the present invention, the main difference between it and Figure 5 is that the first driving voltage in Figure 5 has only two cases, one positive and one negative, while the first driving voltage applied to each first driving electrode in Figure 8 is different and ordered in descending order.

[0087] As shown in Figure 8, the electromagnetic touch screen includes multiple first driving electrodes arranged along a first direction, such as first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn, respectively. One end of the multiple first driving electrodes is coupled to each other, for example, the upper ends of first driving electrodes Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn are coupled to each other, so that the multiple first driving electrodes of the electromagnetic touch screen are connected into a comb-like structure; the electromagnetic touch driving device includes... The electromagnetic touch driving device includes multiple first driving terminals for outputting first driving voltages respectively; it also includes multiple first driving sources coupled to the multiple first driving terminals respectively, such as first driving source S0, first driving source S1, first driving source S2, first driving source S3, ..., first driving source Sn (unlike the scheme in Figure 5, here a first driving source needs to be set for each driving electrode, and the first driving source is not reused); the multiple first driving sources are used to output multiple first driving voltages, such as first driving voltage Vs0, first driving voltage Vs1, first driving voltage Vs2, first driving voltage Vs3, ..., first driving voltage Sn respectively. Voltages Vs3, ..., first driving voltage Vsn; In the electromagnetic touch screen, multiple first driving electrodes are arranged along a first direction, for example, in Figure 1 or Figure 3, the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged sequentially from left to right along the horizontal direction, with the first driving electrode Tx0 being the first driving electrode arranged along the first direction and the first driving electrode Txn being the (n+1)th driving electrode arranged along the first direction; The electromagnetic touch driving device follows driving stage 1, driving stage 2, ... The driving stages i, ..., n are driven sequentially. In each driving stage, the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3, ... and the first driving electrode Txn are driven simultaneously. In each driving stage, the first driving voltage Vs0 received by the first driving electrode Tx0 is greater than or equal to the first driving voltage Vs1 received by the first driving electrode Tx1, which is greater than or equal to the first driving voltage Vs2 received by the first driving electrode Tx2, which is greater than or equal to the first driving voltage Vs3 received by the first driving electrode Tx3, which is greater than or equal to the first driving voltage Vsn received by the first driving electrode Txn.

[0088] In each driving stage of this embodiment, the first driving voltages output by the first driving source to the first driving electrode are arranged in descending order along the first direction. That is, by controlling the magnitude of the first driving voltage in each driving stage, the current direction in the driving coil formed by any two adjacent first driving electrodes in each driving stage is consistent, for example, as shown in Figure 8, they are all clockwise. This can avoid the voltage signal received when the electromagnetic pen is sensed at different positions on the electromagnetic touch screen being out of phase.

[0089] It is understood that a first driving source providing a first driving voltage to each first driving electrode of the electromagnetic touch screen is set in the electromagnetic touch driving device. Therefore, in order to achieve the driving effect shown in Figure 8, an embodiment of the present invention provides an electromagnetic touch driving device with the structure shown in Figure 9. The electromagnetic touch driving device includes multiple first driving terminals qd0, qd1, qd2, qd3, ..., qdn, and also includes multiple corresponding first driving sources S0, S1, S2, S3, ..., Sn. The electromagnetic touch driving device drives in the order of driving stage 1, driving stage 2, ..., driving stage i, ..., driving stage n, and simultaneously drives the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., and Txn in each driving stage. Each driving phase has the same duration. Specifically, in each driving phase, the first driving source S0 in the electromagnetic touch driving device provides a first driving voltage Vs0 to the lower end of the first driving electrode Tx0 in the electromagnetic touch screen through the first driving terminal qd0; the first driving source S1 in the electromagnetic touch driving device provides a first driving voltage Vs1 to the lower end of the first driving electrode Tx1 in the electromagnetic touch screen through the first driving terminal qd1; the first driving source S2 in the electromagnetic touch driving device provides a first driving voltage Vs2 to the lower end of the first driving electrode Tx2 in the electromagnetic touch screen through the first driving terminal qd2; ..., the first driving source Si in the electromagnetic touch driving device provides a first driving voltage Vsi to the lower end of the first driving electrode Txi in the electromagnetic touch screen through the first driving terminal qdi; ..., the first driving source Sn in the electromagnetic touch driving device provides a first driving voltage Vsn to the lower end of the first driving electrode Txn in the electromagnetic touch screen through the first driving terminal qdn; and:

[0090] In driving phase 1: for any two adjacent first driving electrodes, the difference between the first driving voltage Vs0 and the first driving voltage Vs1 is the largest.

[0091] In driving phase 2: for any two adjacent first driving electrodes, the difference between the first driving voltages obtained is the largest between the first driving voltage Vs1 and the first driving voltage Vs2;...

[0092] In driving phase i: for any two adjacent first driving electrodes, the difference between the first driving voltage Vsi-1 and the first driving voltage Vsi is the largest;...

[0093] In the driving stage n: for any two adjacent first driving electrodes, the difference between the first driving voltage Vsn-1 and the first driving voltage Vsn is the largest.

[0094] Therefore, in this embodiment, the multiple first driving voltages decrease sequentially along the arrangement direction of the multiple first driving terminals. In the i-th driving stage, that is, in driving stage i, the difference between the i-th first driving voltage and the (i+1)-th first driving voltage along the arrangement direction is greater than the difference between any other first driving voltage and the next first driving voltage. Therefore, in driving stage 1, that is, the first driving stage, the electromagnetic field strength in the region between the first driving electrode Tx0 and the first driving electrode Tx1 is the greatest; in driving stage 2, that is, the second driving stage, the electromagnetic field strength between the first driving electrode Tx1 and the first driving electrode Tx2 is the greatest. The electromagnetic field strength is greatest in the region between x2; ...; In driving stage i, that is, the i-th driving stage, the electromagnetic field strength is greatest in the region between the first driving electrode Txi-1 and the first driving electrode Txi; ..., in the n-th driving stage, the electromagnetic field strength is greatest in the region between the first driving electrode Txn-1 and the first driving electrode Txn. That is, each driving stage has a corresponding region with the greatest electromagnetic field strength, and this corresponding region shifts along the first direction as the driving stage jumps. Thus, the position of the electromagnetic pen can be determined by sensing the changes in the electromagnetic field at different times. The electromagnetic touch screen includes n+1 first driving electrodes. A complete driving cycle requires n drives, each corresponding to one of the driving stages mentioned above. During each driving stage, all sensing electrodes of the electromagnetic touch screen simultaneously collect signals. After completing a complete driving cycle for all driving electrodes, the collected sensing signals are combined with the driving signals of the driving electrodes to calculate the coordinates of the electromagnetic pen.

[0095] Referring to Figure 10, which is a schematic diagram of the driving effect of an electromagnetic touch screen provided by an electromagnetic touch driving device according to another embodiment of the present invention, the electromagnetic touch screen, as shown in Figure 1 or Figure 3, includes a plurality of first driving electrodes arranged along a first direction, such as first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn arranged sequentially along a horizontal direction. One end of the plurality of first driving electrodes is coupled to each other, for example, the upper ends of first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn are coupled to each other, so that the plurality of first driving electrodes of the electromagnetic touch screen are connected to form a comb-like structure; the electromagnetic touch screen also includes a plurality of second driving electrodes arranged along a second direction, the second direction being perpendicular to the first direction, such as second driving electrodes Rx0, Tx1, Tx2, Tx3, ... and Txn arranged sequentially along a vertical direction. Two driving electrodes Rx1, Rx2, Rx3, ... and a second driving electrode Rxn are provided. One end of each of the multiple second driving electrodes is coupled to the others, for example, the left ends of the second driving electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn are coupled to each other, so that the multiple second driving electrodes of the electromagnetic touch screen are connected in a comb-like structure. The electromagnetic touch driving device includes multiple first driving terminals for outputting a first driving voltage and multiple second driving terminals for outputting a second driving voltage. The electromagnetic touch driving device drives the electrodes sequentially according to driving stage 1A and driving stage 1B. In each driving stage, multiple first driving electrodes and multiple second driving electrodes are driven simultaneously. Specifically:

[0096] In driving phase 1A: the lower end of the first driving electrode Tx0 receives the first driving voltage Vs0 provided by the first driving end of the electromagnetic touch driving device, the lower end of the first driving electrode Tx1 receives the first driving voltage Vs1 provided by the first driving end of the electromagnetic touch driving device, the lower end of the first driving electrode Tx2 receives the first driving voltage Vs2 provided by the first driving end of the electromagnetic touch driving device, ..., the lower end of the first driving electrode Txn-2 receives the first driving voltage Vsn-2 provided by the first driving end of the electromagnetic touch driving device, the lower end of the first driving electrode Txn-1 receives the first driving voltage Vsn provided by the first driving end of the electromagnetic touch driving device, the lower end of the first driving electrode Txn receives the first driving voltage Vsn provided by the first driving end of the electromagnetic touch driving device, and the first driving voltage Vs0 ≥ first driving voltage Vs1 ≥ first driving voltage Vs2 ≥ ... ≥ first driving voltage Vsn-2 ≥ first driving voltage Vsn-1 ≥ first driving voltage Vsn;

[0097] In driving phase 1B: the right end of the second driving electrode Rx0 receives the second driving voltage Vs0 provided by the second driving terminal of the electromagnetic touch driving device; the right end of the second driving electrode Rx1 receives the second driving voltage Vs1 provided by the second driving terminal of the electromagnetic touch driving device; the right end of the second driving electrode Rx2 receives the second driving voltage Vs2 provided by the second driving terminal of the electromagnetic touch driving device; ..., the right end of the second driving electrode Rxn-2 receives the second driving voltage Vsn-2 provided by the second driving terminal of the electromagnetic touch driving device; the right end of the second driving electrode Rxn-1 receives the second driving voltage Vsn provided by the second driving terminal of the electromagnetic touch driving device; the right end of the second driving electrode Rxn receives the second driving voltage Vsn provided by the second driving terminal of the electromagnetic touch driving device; and the second driving voltage Vs0 ≥ the second driving voltage Vs1 ≥ the second driving voltage Vs2 ≥ ... ≥ the second driving voltage Vsn-2 ≥ the second driving voltage Vsn-1 ≥ the second driving voltage Vsn.

[0098] It is understood that the first driving source providing the first driving voltage to each of the first driving electrodes of the electromagnetic touch screen, and the second driving source providing the second driving voltage to each of the second driving electrodes of the electromagnetic touch screen, are both provided in the electromagnetic touch driving device. Since driving phase 1A and driving phase 1B are not executed simultaneously, each of the first driving sources in the electromagnetic touch screen can be reused as a second driving source; similarly, each of the first driving terminals of the electromagnetic touch screen can also be reused as a second driving terminal.

[0099] The driving efficiency of Figure 8 has already been explained with reference to Figure 9. Figure 9 is also applicable to the driving structure of Figure 10. In the electromagnetic touch screen, multiple first driving electrodes are arranged along a first direction. For example, in Figure 1 or Figure 3, the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged horizontally from left to right, with Tx0 being the first driving electrode arranged along the first direction, ..., Txn being the (n+1)th driving electrode arranged along the first direction. Multiple second driving electrodes are arranged along a second direction. For example, in Figure 1 or Figure 3, the second driving electrodes Rx0, Rx1, Rx2, Rx3, ..., Rxn are arranged vertically from top to bottom, with Rx0 being the first driving electrode arranged along the second direction, ..., Rxn being the (n+1)th driving electrode arranged along the second direction. The first direction can be perpendicular to the second direction.

[0100] In this embodiment, the driving stages of the electromagnetic touch screen driven by the electromagnetic touch driving device include a first driving stage and a second driving stage; the first driving stage corresponds to the driving stage 1A mentioned above, and the second driving stage corresponds to the driving stage 1B mentioned above. In the first driving stage, driving sources S0, S1, S2, S3, ..., Sn are used as first driving sources. The first driving voltage output by the i-th first driving source to the i-th first driving terminal is greater than or equal to the first driving voltage output by the (i+1)-th first driving source to the (i+1)-th first driving terminal, thereby making the first driving voltage output by the i-th first driving source to the i-th first driving electrode arranged along the first direction greater than or equal to the first driving voltage output by the (i+1)-th first driving source to the (i+1)-th first driving electrode arranged along the first direction, where 1≤i≤n, i and n are positive integers, and n+1 is the number of first driving electrodes. In the second driving stage, driving sources S0, S1, S2, S3, ..., Sn are used as second driving sources. The i-th second driving voltage output by the i-th second driving source to the i-th second driving terminal is greater than or equal to the i+1-th second driving voltage output by the (i+1)-th second driving source to the (i+1)-th second driving terminal. This ensures that the second driving voltage output by the i-th second driving source to the i-th second driving electrode arranged along the second direction is greater than or equal to the second driving voltage output by the (i+1)-th second driving source to the (i+1)-th second driving electrode arranged along the second direction, where 1 ≤ i ≤ n, i and n are positive integers, and n+1 is the number of second driving electrodes. By controlling the magnitude of the first driving voltage in driving stage 1A and the second driving voltage in driving stage 1B, the current direction in the driving coil formed by any two first driving electrodes in both the first and second driving stages is consistent, for example, clockwise. This avoids signal reversal when the electromagnetic pen is sensed at different positions on the electromagnetic touchscreen.

[0101] In this embodiment, during the driving stage 1A, the horizontally arranged electrodes Tx0, Tx1, Tx2, Tx3, ..., and Txn are used as driving electrodes to provide driving signals. Simultaneously, during driving stage 1A, the vertically arranged electrodes Rx0, Rx1, Rx2, Rx3, ..., and Rxn are used as sensing electrodes, which acquire sensing signals to obtain coordinate information in one dimension. Then, in driving stage 1B, the vertically arranged electrodes Rx0, Rx1, Rx2, Rx3, ..., and Rxn are used as driving electrodes to provide driving signals. Simultaneously, during driving stage 1B, the horizontally arranged electrodes Tx0, Tx1, Tx2, Tx3, ..., and Txn are used as sensing electrodes, which acquire sensing signals to obtain coordinate information in another dimension. Finally, by combining the coordinate information obtained in driving stages 1A and 1B, the coordinate position of the electromagnetic pen is calculated.

[0102] Furthermore, based on the embodiment of FIG10 above, in one possible implementation, in the first driving stage, the first driving voltages output by multiple first driving sources to n+1 first driving electrodes arranged along the first direction are arranged in descending order of arithmetic progression; in the second driving stage, the second driving voltages output by multiple second driving sources to n+1 second driving electrodes arranged along the second direction are arranged in descending order of arithmetic progression. That is, in driving stage 1A, the differences between driving voltage Vs0 and driving voltage Vs1, the differences between driving voltage Vs1 and driving voltage Vs2, ..., the differences between driving voltage Vsn-2 and driving voltage Vsn-1, and the differences between driving voltage Vsn-1 and driving voltage Vsn are all the same; and in driving stage 1B, the differences between driving voltage Vs0 and driving voltage Vs1, the differences between driving voltage Vs1 and driving voltage Vs2, ..., the differences between driving voltage Vsn-2 and driving voltage Vsn-1, and the differences between driving voltage Vsn-1 and driving voltage Vsn are all the same.

[0103] In this implementation, by controlling the driving voltage as described above, the intensity of the electromagnetic field generated in each area of ​​the electromagnetic touch screen can be made more consistent, and the intensity of the sensing signal collected by the sensing electrode in each driving stage is also more similar, which can more accurately determine the position coordinates of the electromagnetic pen.

[0104] The above embodiments all use a driving source to drive each driving electrode of the electromagnetic touch screen in each driving stage. There are also several embodiments that use charging capacitors to drive each driving electrode of the electromagnetic touch screen, which will be described one by one below.

[0105] Referring to Figure 11, Figure 11 is a schematic diagram of the driving effect of an electromagnetic touch screen driven by a charging capacitor according to an embodiment of the present invention. The electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, such as first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn. One end of the plurality of first driving electrodes is coupled to each other, for example, the upper ends of first driving electrodes Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn are coupled to each other, so that the plurality of first driving electrodes of the electromagnetic touch screen are connected into a comb-like structure. The electromagnetic touch driving device drives in the order of driving stage 1, driving stage 2, ..., driving stage n-1, driving stage n. In each driving stage, at least two of the first driving electrodes Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, ... and first driving electrode Txn are driven simultaneously. Specifically:

[0106] Driving phase 1 includes sub-phase 1A and sub-phase 1B. In sub-phase 1A, the anode and cathode of a fully charged capacitor with positive voltage are connected to the lower ends of the first driving electrodes Tx0 and Tx1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase 1B, the anode and cathode of a fully charged capacitor with negative voltage are connected to the lower ends of the first driving electrodes Tx0 and Tx1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. The fully charged capacitor with positive voltage in sub-phase 1A and the fully charged capacitor with negative voltage in sub-phase 1B are not the same capacitor. Because sub-phases 1A and 1B are continuous, a single capacitor cannot achieve a voltage jump from positive to negative; therefore, two different capacitors are used. In sub-phase 1A, the fully charged capacitor with positive voltage operates, while the other capacitor charges to reach negative voltage. In sub-phase 1B, the fully charged capacitor with negative voltage operates, while the other capacitor charges to reach positive voltage. The specific process is detailed below.

[0107] Using the above structure, in driving stage 1, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Tx1 is connected to both ends of the charging capacitor. The charging capacitor discharges, thereby generating a loop current in the driving coil, and thus generating a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx1. The switching between sub-stage 1A and sub-stage 1B causes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Tx1 to change alternately. When the electromagnetic pen is placed in this region, the electromagnetic pen senses and generates an alternating electric field, that is, generates an induced voltage signal. Since the other first driving electrodes are not connected to the discharge circuit of the charging capacitor, there is no loop current, and therefore no magnetic field is generated.

[0108] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the anode and cathode of the positively charged capacitor are connected to the lower ends of the first driving electrodes Tx1 and Tx2, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase 2B, the anode and cathode of the negatively charged capacitor are connected to the lower ends of the first driving electrodes Tx1 and Tx2, respectively, while the lower ends of the other first driving electrodes are grounded or left floating;...

[0109] The driving stage n includes sub-stage nA and sub-stage nB. In sub-stage nA, the anode and cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively, and the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage nB, the anode and cathode of the charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively, and the lower ends of the other first driving electrodes are grounded or left floating.

[0110] It should be noted that the electromagnetic touch screen includes n+1 first driving electrodes, and one sensing cycle includes n driving stages. Therefore, a total of n driving times are required. Each time corresponds to one of the driving stages mentioned above. The duration of each driving stage is the same. Each driving stage includes a first sub-stage and a second sub-stage. The signal frequency corresponding to the driving stage can be from 10kHz to 10MHz.

[0111] During each driving stage, all the sensing electrodes of the electromagnetic touch screen simultaneously collect signals. After completing a full cycle of driving all the driving electrodes, the collected sensing signals are combined with the driving signals of the driving electrodes to realize the coordinate calculation of the electromagnetic pen.

[0112] To achieve the driving effect shown in Figure 11 for the electromagnetic touch screen, an embodiment of the present invention provides an electromagnetic touch driving device with the structure shown in Figure 12. The charging capacitor used in the electromagnetic touch driving device includes a first charging capacitor CP and a second charging capacitor CN. The polarities of the first charging capacitor CP and the second charging capacitor CN are opposite. The electromagnetic touch driving device also includes a first single-pole double-throw switch sw1, a second single-pole double-throw switch sw2, a third single-pole double-throw switch sw3, a fourth single-pole double-throw switch sw4, a first switch swA0 and a second switch swB0 corresponding to the first driving electrode Tx0, ..., a first switch swAn-1 and a second switch swBn-1 corresponding to the first driving electrode Txn-1, and a first switch swAn and a second switch swBn corresponding to the first driving electrode Txn.

[0113] Specifically: the anode of the first charging capacitor CP is simultaneously connected to the first selection terminal of the first single-pole double-throw switch sw1 and the first selection terminal of the third single-pole double-throw switch sw3; the cathode of the first charging capacitor CP is simultaneously connected to the first selection terminal of the second single-pole double-throw switch sw2 and the first selection terminal of the fourth single-pole double-throw switch sw4; the anode of the second charging capacitor CN is simultaneously connected to the second selection terminal of the first single-pole double-throw switch sw1 and the second selection terminal of the fourth single-pole double-throw switch sw4; the cathode of the second charging capacitor CN is simultaneously connected to the second selection terminal of the second single-pole double-throw switch sw2 and the second selection terminal of the third single-pole double-throw switch sw3; the common terminal of the third single-pole double-throw switch sw3 is connected to the reference voltage Vref; the common terminal of the fourth single-pole double-throw switch sw4 is grounded; one end of the first switch swA0 is connected to the first driving electrode Tx0, and the other end of the first switch swA0 is connected to the first single-pole double-throw switch sw1. The common terminal of the first switch swAn-1; ...; One end of the first switch swAn-1 is connected to the first driving electrode Txn-1, and the other end of the first switch swAn-1 is connected to the common terminal of the first single-pole double-throw switch sw1; One end of the first switch swAn is connected to the first driving electrode Txn, and the other end of the first switch swAn is connected to the common terminal of the first single-pole double-throw switch sw1; One end of the second switch swB0 is connected to the first driving electrode Tx0, and the other end of the first switch swB0 is connected to the common terminal of the second single-pole double-throw switch sw2; ...; One end of the second switch swBn-1 is connected to the first driving electrode Txn-1, and the other end of the second switch swBn-1 is connected to the common terminal of the second single-pole double-throw switch sw2; One end of the second switch swBn is connected to the first driving electrode Txn, and the other end of the second switch swBn is connected to the common terminal of the second single-pole double-throw switch sw2.

[0114] In Figure 11, each driving stage has the same duration, and each driving stage includes a first sub-stage and a second sub-stage. Multiple first driving electrodes in the electromagnetic touchscreen are arranged along a first direction. For example, in Figures 1 and 3, the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged sequentially from left to right along the horizontal direction. The first driving electrode Tx0 is the first first driving electrode arranged along the first direction, ..., and the first driving electrode Txn is the (n+1)th first driving electrode arranged along the first direction. Therefore, in this embodiment: In the first sub-stage of the i-th driving stage, i.e., in sub-stage iA, the first single-pole double-throw switch sw1 and the first switch swAi-1 couple the anode of the first charging capacitor CP to the i-th first driving terminal, thereby coupling the anode of the first charging capacitor CP to the i-th first driving electrode arranged along the first direction, i.e., the first driving electrode Txi-1. The second single-pole double-throw switch sw2 and the second switch swBi couple the cathode of the first charging capacitor CP to the (i+1)-th first driving terminal, thereby coupling the cathode of the first charging capacitor CP to the (i+1)-th first driving electrode arranged along the first direction, i.e., the first driving electrode. In Txi, the third single-pole double-throw switch sw3 couples the cathode of the second charging capacitor CN to the reference voltage, and the fourth single-pole double-throw switch sw4 grounds the anode of the second charging capacitor CN. This means that at this time, the first charging capacitor CP drives and charges the second charging capacitor CN. In the second sub-stage of the i-th driving stage, the first single-pole double-throw switch sw1 and the first switch swAi-1 couple the anode of the second charging capacitor CN to the i-th first driving terminal, thereby coupling the anode of the second charging capacitor CN to the i-th first driving electrode arranged along the first direction, i.e., the first driving electrode Txi-1. Switch sw2 and the second switch swBi couple the cathode of the second charging capacitor CN to the (i+1)th first driving terminal, thereby coupling the cathode of the second charging capacitor CN to the (i+1)th first driving electrode arranged along the first direction, i.e., the first driving electrode Txi. The third single-pole double-throw switch sw3 couples the anode of the first charging capacitor CP to the reference voltage. The fourth single-pole double-throw switch sw4 grounds the cathode of the first charging capacitor CP, i.e., at this time, the second charging capacitor CN drives and charges the first charging capacitor CP; where 1≤i≤n, i and n are positive integers, and n+1 is the number of first driving electrodes.

[0115] Referring to Figures 11 and 12 and the driving control process of each step in this embodiment, it can be seen that when the electromagnetic touch driving device in this embodiment drives the electromagnetic touch screen, in one driving stage, the two ends of the charging capacitor are respectively coupled to two of the multiple first driving ends. For example, in the first driving stage, i.e., driving stage 1, the charging capacitor is coupled to the first driving end corresponding to the first driving electrode Tx0 and the first driving end corresponding to the first driving electrode Tx1. In different driving stages, the two first driving ends coupled are different. For example, in the second driving stage, i.e., driving stage 2, the charging capacitor is coupled to the first driving end corresponding to the first driving electrode Tx1 and the first driving end corresponding to the first driving electrode Tx2; ..., in the i-th driving stage, i.e., driving stage i, the charging capacitor is coupled to the first driving end corresponding to the first driving electrode Txi-1 and the first driving end corresponding to the first driving electrode Txi; in the n-th driving stage, i.e., driving stage n, the charging capacitor is coupled to the first driving end corresponding to the first driving electrode Txn-1 and the first driving end corresponding to the first driving electrode Txn. More specifically, the first driving electrodes are arranged along a first direction. In the i-th driving stage, the anode and cathode of the charging capacitor are coupled to the i-th and (i+1)-th first driving terminals, respectively, thereby being coupled to the i-th and (i+1)-th first driving electrodes arranged along the first direction, i.e., first driving electrode Txi-1 and first driving electrode Txi, where i is a positive integer. Furthermore, in this embodiment, the charging capacitor includes a first charging capacitor CP and a second charging capacitor CN, with opposite polarities. In the first sub-stage of the i-th driving stage, i.e., in sub-stage iA, the anode and cathode of the first charging capacitor CP are coupled to the i-th and (i+1)-th first driving terminals, respectively. In the second sub-stage of the i-th driving stage, i.e., in sub-stage iB, the anode and cathode of the second charging capacitor CN are coupled to the i-th and (i+1)-th first driving terminals, respectively.

[0116] In a complete driving stage of this embodiment, by sequentially connecting the first charging capacitor CP and the second charging capacitor CN, the switching of the connection of the first charging capacitor CP and the second charging capacitor CN causes the magnetic field generated in the region between the two driven first driving electrodes to change alternately. When the electromagnetic pen is placed in this region, the electromagnetic pen senses and generates an alternating electric field, that is, generates an induced voltage signal. And driving is performed sequentially in the order of driving stage 1 to driving stage n. In each driving stage, the first charging capacitor CP and the second charging capacitor CN are used to drive two different first driving electrodes. When driving each driving stage, all sensing electrodes of the electromagnetic touch screen simultaneously collect signals. After completing a complete round of driving of all driving electrodes, the collected sensing signals are combined with the driving signals of the driving electrodes, that is, the coordinate calculation of the electromagnetic pen can be realized. In addition, in each driving stage, the current direction in each driving coil that generates current is consistent. Therefore, in each driving stage, the change of electromagnetic field sensed at different positions of the electromagnetic touch screen is consistent, thereby avoiding the signal inversion sensed at different positions of the electromagnetic touch screen in the same driving stage.

[0117] Referring to Figure 13, which is a schematic diagram of the driving effect of an electromagnetic touch driving device on an electromagnetic touch screen provided by an embodiment of the present invention based on the embodiment of Figure 11, Figure 13 shows the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen. The charging capacitors filled with negative voltage connected in sub-stage B (i.e., sub-stage 1B, sub-stage 2B, ..., sub-stage nB) of each driving stage in Figure 11 are removed, and the corresponding first driving electrode is grounded, thus obtaining the sub-stages of Figure 13. In this embodiment, the electromagnetic touch driving device drives the screen sequentially in the order of driving stage 1, driving stage 2, ..., driving stage n-1, and driving stage n. In each driving stage, at least two of the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., and Txn are driven. Specifically:

[0118] Driving stage 1 includes sub-stage 1A and sub-stage 1B. In sub-stage 1A, the anode and cathode of a fully charged capacitor with positive voltage are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Tx1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage 1B, the lower ends of all the first driving electrodes are grounded or left floating. Therefore, in sub-stage 1A, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Tx1 is connected to both ends of the charging capacitor. The charging capacitor discharges, thereby generating a loop current in the driving coil, which in turn generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx1. The switching between sub-stage 1A and sub-stage 1B causes a change in the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Tx1. When the electromagnetic pen is placed in this region, the electromagnetic pen induces an alternating electric field, i.e., generates an induced voltage signal. Since the other first driving electrodes are not connected to the discharge loop of the charging capacitor, there is no loop current, and therefore no magnetic field is generated.

[0119] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the anode and cathode of the fully charged capacitor with positive voltage are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Tx2, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase 2B, the lower ends of all first driving electrodes are grounded;...

[0120] The driving stage n includes sub-stage nA and sub-stage nB. In sub-stage nA, the anode and cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage nB, the lower ends of all the first driving electrodes are grounded.

[0121] It should also be noted that the electromagnetic touch screen includes n+1 first driving electrodes, and one sensing cycle includes n driving stages. Therefore, a complete driving cycle requires n driving times, each corresponding to one of the driving stages mentioned above. The duration of each driving stage is the same, and each driving stage includes a first sub-stage and a second sub-stage. Specifically, in the first sub-stage iA of the i-th driving stage, the anode and cathode of the first charging capacitor CP are coupled to the i-th and (i+1)-th first driving terminals, respectively, thereby being coupled to the i-th and (i+1)-th first driving electrodes arranged along the first direction, respectively; in the second sub-stage iB of the i-th driving stage, each first driving terminal is grounded; during the driving of each driving stage, all sensing electrodes of the electromagnetic touch screen simultaneously collect signals. After completing a full cycle of driving of all driving electrodes, the collected sensing signals are combined with the driving signals of the driving electrodes to realize the coordinate calculation of the electromagnetic pen; by controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the reversal of the signals sensed by the electromagnetic touch screen in the same driving stage.

[0122] Referring to Figure 14, which is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided by another embodiment of the present invention, based on the embodiment of Figure 11 with modifications, in Figure 14, each driving stage drives two adjacent first driving electrodes, while in each driving stage of Figure 14, the charging capacitor drives two separated first driving electrodes. In this embodiment, the electromagnetic touch driving device drives in the order of driving stage 1, driving stage 2, ..., driving stage i, ..., and in each driving stage, at least two of the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn are driven. Specifically:

[0123] Driving stage 1 includes sub-stage 1A and sub-stage 1B. In sub-stage 1A, the anode and cathode of a charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Txm-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage 1B, the anode and cathode of a charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Txm-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. Therefore, in driving stage 1, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Txm-1... Connected to both ends of the charging capacitor, the charging capacitor discharges, thereby generating a loop current in the driving coil, which in turn generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Txm-1. The switching between sub-stage 1A and sub-stage 1B causes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Txm-1 to change alternately. When the electromagnetic pen is placed in this region, the electromagnetic pen senses and generates an alternating electric field, that is, generates an induced voltage signal. Since the other first driving electrodes are not connected to the discharge circuit of the charging capacitor, there is no loop current, and therefore no magnetic field is generated.

[0124] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the anode and cathode of the fully charged capacitor with positive voltage are connected to the lower ends of the first driving electrodes Tx1 and Txm, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase 2B, the anode and cathode of the fully charged capacitor with negative voltage are connected to the lower ends of the first driving electrodes Tx1 and Txm, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. Here, m is a positive integer greater than or equal to 2;...

[0125] The driving phase i includes sub-phase iA and sub-phase iB. In sub-phase iA, the anode and cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Txi-1 and the first driving electrode Txi-1+m, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase iB, the anode and cathode of the charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Txi-1 and the first driving electrode Txi-1+m, respectively, while the lower ends of the other first driving electrodes are grounded or left floating;...

[0126] That is, in this embodiment, the multiple first driving electrodes in the electromagnetic touch screen are arranged along the first direction. For example, in Figure 1 or Figure 3, the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged in order from left to right along the horizontal direction. The duration of each driving stage is the same. In the i-th driving stage, the anode and cathode of the charging capacitor are respectively coupled to the i-th first driving terminal and the (i+m)-th first driving terminal, thereby being coupled to the i-th and (i+m)-th first driving electrodes arranged along the first direction, that is, the first driving electrode Txi-1 and the first driving electrode Txi-1+m, where m is a positive integer greater than or equal to 2. During each driving stage, all sensing electrodes of the electromagnetic touchscreen simultaneously acquire signals. After completing a full cycle of driving all driving electrodes, the acquired sensing signals are combined with the driving signals of the driving electrodes to realize the coordinate calculation of the electromagnetic pen. By controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touchscreen is consistent in each driving stage, thereby avoiding the reversal of signals sensed by the electromagnetic touchscreen in the same driving stage.

[0127] Referring to Figure 15, which is a schematic diagram of the driving effect of an electromagnetic touch driving device on an electromagnetic touch screen provided by an embodiment of the present invention based on a modification of the embodiment in Figure 14, in each driving stage of Figure 14, the charging capacitor drives two separated and fixedly spaced first driving electrodes, while in each driving stage of Figure 15, the charging capacitor drives two separated and randomly spaced first driving electrodes. In this embodiment, the electromagnetic touch driving device drives in the order of driving stage 1, driving stage 2, ..., driving stage k, ..., and in each driving stage, at least two of the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn are driven. Specifically:

[0128] Driving stage 1 includes sub-stage 1A and sub-stage 1B. In sub-stage 1A, the anode and cathode of a charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Txo, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage 1B, the anode and cathode of a charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Txo, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. Therefore, in driving stage 1, the driving coil formed by the first driving electrode Tx0 and the first driving electrode Txo is connected... At both ends of the charging capacitor, the charging capacitor discharges, thereby generating a loop current in the driving coil, which in turn generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Txo. The switching between sub-stage 1A and sub-stage 1B causes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Txo to change alternately. When the electromagnetic pen is placed in this region, the electromagnetic pen senses and generates an alternating electric field, that is, generates an induced voltage signal. Since the other first driving electrodes are not connected to the discharge circuit of the charging capacitor, there is no loop current and therefore no magnetic field is generated.

[0129] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the anode and cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrodes Txi-1 and Txj-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-phase 2B, the anode and cathode of the charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrodes Txi-1 and Txj-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating;...

[0130] The driving stage k includes sub-stage kA and sub-stage kB. In sub-stage kA, the anode and cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Txp-1 and the first driving electrode Txp+q-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating. In sub-stage kB, the anode and cathode of the charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Txp-1 and the first driving electrode Txp+q-1, respectively, while the lower ends of the other first driving electrodes are grounded or left floating;...

[0131] Furthermore, each first driving terminal is coupled to the charging capacitor at least in one driving stage. In this embodiment, by controlling the connection of the charging capacitor in each driving stage, the current direction in the driving coil that generates current is consistent in each driving stage. Therefore, the change in the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the reversal of the signal sensed by the electromagnetic touch screen in the same driving stage.

[0132] In other embodiments, from the first driving stage to the last driving stage, the union of the coverage areas of the driving coils formed by the two first driving electrodes driven by the charging capacitor covers all the first driving electrodes, that is, it covers the first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn. That is, in one embodiment, multiple first driving electrodes in the electromagnetic touch screen are arranged along a first direction. For example, in Figure 1 or Figure 3, the first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged sequentially from left to right along the horizontal direction. The duration of each driving stage is the same. In the k-th driving stage, the anode and cathode of the charging capacitor are respectively coupled to the first driving terminals leading to the p-th and p+q-th first driving electrodes arranged along the first direction. k is a positive integer, p is a random positive integer that is different in each driving stage, and q is a random positive integer that is different in each driving stage. The p-th to p+q-th first driving electrodes constitute the coverage area of ​​the k-th driving stage, and the union of the coverage areas of each driving stage covers each first driving electrode. During each driving stage, all sensing electrodes of the electromagnetic touchscreen simultaneously acquire signals. After completing a full cycle of driving all driving electrodes, the acquired sensing signals are combined with the driving signals of the driving electrodes to realize the coordinate calculation of the electromagnetic pen. By controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touchscreen is consistent in each driving stage, thereby avoiding the reversal of signals sensed by the electromagnetic touchscreen in the same driving stage.

[0133] Referring to Figure 16, which is a schematic diagram of the driving effect of an electromagnetic touch driving device on an electromagnetic touch screen provided by an embodiment of the present invention based on a modification of the embodiment in Figure 11, Figure 11 divides the driving stage of each driving coil into sub-stage A and sub-stage B, and connects the first charging capacitor CP and the second charging capacitor CN respectively; while in Figure 16, the driving stage of each driving coil is divided into sub-stage A, sub-stage B, ..., sub-stage M, a total of h sub-stages, and connects h charging capacitors such as charging capacitor VA, charging capacitor VB, ..., charging capacitor VM respectively. In this embodiment, the electromagnetic touch driving device drives in the order of driving stage 1, driving stage 2, ..., driving stage n-1, driving stage n. In the i-th driving stage, the i-th first driving electrode Tx(i-1) and the i+1-th first driving electrode Txi are driven, specifically:

[0134] Driving phase 1 includes sub-phases 1A, 1B, ..., 1M. In sub-phase 1A, the anode and cathode of a fully charged capacitor VA are connected to the lower ends of the first driving electrodes Tx0 and Tx1, respectively. In sub-phase 1B, the anode and cathode of a fully charged capacitor VB are connected to the lower ends of the first driving electrodes Tx0 and Tx1, respectively. ... In sub-phase 1M, the anode and cathode of a fully charged capacitor VM are connected to the lower ends of the first driving electrodes Tx0 and Tx1, respectively. The lower ends of the other first driving electrodes are grounded or left floating. Therefore, in driving phase 1, the first driving electrode Tx... The driving coil formed by the first driving electrode Tx0 and the first driving electrode Tx1 is connected to both ends of the charging capacitor. The charging capacitor discharges, thereby generating a loop current in the driving coil, which in turn generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx1. The switching of sub-stages 1A, 1B, ..., and 1M causes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Tx1 to change alternately. When the electromagnetic pen is placed in this region, the electromagnetic pen senses and generates an alternating electric field, that is, generates an induced voltage signal. Since the other first driving electrodes are not connected to the discharge circuit of the charging capacitor, there is no loop current, and therefore no magnetic field is generated.

[0135] Driving phase 2 includes sub-phases 2A, 2B, ..., 2M. In sub-phase 2A, the anode and cathode of a fully charged capacitor VA are connected to the lower ends of the first driving electrodes Tx1 and Tx2, respectively. In sub-phase 2B, the anode and cathode of a fully charged capacitor VB are connected to the lower ends of the first driving electrodes Tx1 and Tx2, respectively. ... In sub-phase 1M, the anode and cathode of a fully charged capacitor VM are connected to the lower ends of the first driving electrodes Tx1 and Tx2, respectively. The lower ends of the other first driving electrodes are grounded or left floating.

[0136] The driving stage n includes sub-stages nA, nB, ..., nM. In sub-stage nA, the anode and cathode of the fully charged charging capacitor VA are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively. In sub-stage nB, the anode and cathode of the fully charged charging capacitor VB are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively. ... In sub-stage nM, the anode and cathode of the fully charged charging capacitor VM are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn, respectively. The lower ends of the other first driving electrodes are grounded or left floating.

[0137] Therefore, in this embodiment, the electromagnetic touch screen includes n+1 first driving electrodes. A complete driving cycle requires n drives, each corresponding to one of the aforementioned driving stages. Each driving stage has the same duration, and each driving stage includes h sub-stages. The charging capacitors include h charging capacitors with different charging capacities, where h is a positive integer greater than 2. In the i-th sub-stage of the h sub-stages of the i-th driving stage, the anode and cathode of the i-th charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively, thereby coupling to the i-th and (i+1)-th first driving terminals arranged along the first direction. The moving electrode, i, is a positive integer less than or equal to h. During each driving step, all sensing electrodes of the electromagnetic touch screen simultaneously collect signals. After completing a full cycle of driving all driving electrodes, the collected sensing signals are combined with the driving signals of the driving electrodes to realize the coordinate calculation of the electromagnetic pen. By controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the signal inversion sensed by the electromagnetic touch screen in the same driving stage.

[0138] Referring to Figure 17, which is a schematic diagram of the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen according to another embodiment of the present invention. As shown in Figure 1 or Figure 3, the electromagnetic touch screen includes multiple first driving electrodes arranged along a first direction, such as first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn arranged sequentially along the horizontal direction. One end of each of the multiple first driving electrodes is coupled to the others, for example, the upper ends of first driving electrodes Tx0, Tx1, Tx2, Tx3, ... and Txn are coupled to each other, forming a comb-like structure. The multiple first driving electrodes are arranged along the first direction, for example, first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are arranged sequentially from left to right along the horizontal direction. First driving electrode Tx0 is the first first driving electrode arranged along the first direction, ..., and first driving electrode Txn is the (n+1)th first driving electrode arranged along the first direction. The magnetic touch screen also includes multiple second driving electrodes arranged along a second direction, which is perpendicular to the first direction. For example, these are second driving electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn arranged sequentially along the vertical direction. One end of each of the multiple second driving electrodes is coupled to the other, for example, the left ends of the second driving electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn are coupled to each other, so that the multiple second driving electrodes of the electromagnetic touch screen are connected to form a comb-like structure. The multiple second driving electrodes are arranged along the second direction, for example, the second driving electrodes Rx0, Rx1, Rx2, Rx3, ... and Rxn are arranged sequentially from top to bottom along the vertical direction. The second driving electrode Rx0 is the first second driving electrode arranged along the second direction, ... and the second driving electrode Rxn is the (n+1)th second driving electrode arranged along the second direction.

[0139] The electromagnetic touch driving device is driven sequentially in the order of driving stage 1 and driving stage 2. In driving stage 1, the charging capacitor is connected to the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3, ... and the first driving electrode Txn. In driving stage 2, the charging capacitor is connected to the second driving electrode Rx0, the second driving electrode Rx1, the second driving electrode Rx2, the second driving electrode Rx3, ... and the second driving electrode Rxn. Specifically:

[0140] Driving phase 1 includes sub-phase 1A and sub-phase 1B. In sub-phase 1A, the first driving electrode Tx0 and the first driving electrode Tx1 constitute the first first driving electrode group, the first driving electrode Tx2 and the first driving electrode Tx3 constitute the second first driving electrode group, the first driving electrode Tx4 and the first driving electrode Tx5 constitute the third first driving electrode group, and so on. When n is odd, that is, there are a total of n+1 first driving electrodes; when n+1 is even, the first driving electrode Txn-1 and the first driving electrode Txn constitute the (n+1)th first driving electrode group. 1) Two first driving electrode groups are connected to each other using multiple charging capacitors and driven simultaneously. In sub-stage 1B, the first driving electrode Tx1 and the first driving electrode Tx2 constitute the first second driving electrode group, the first driving electrode Tx3 and the first driving electrode Tx4 constitute the second second driving electrode group, the first driving electrode Tx5 and the first driving electrode Tx6 constitute the third second driving electrode group, and so on. Multiple charging capacitors are connected to each second driving electrode group and driven simultaneously.

[0141] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the second driving electrode Rx0 and the second driving electrode Rx1 constitute the first first driving electrode group; the second driving electrode Rx2 and the second driving electrode Rx3 constitute the second first driving electrode group; the second driving electrode Rx4 and the second driving electrode Rx5 constitute the third first driving electrode group; ..., when n is odd, that is, there are a total of n+1 first driving electrodes; when n+1 is even, the second driving electrode Rxn-1 and the second driving electrode Rxn constitute the (n-th)th... +1) / 2 first driving electrode groups, using multiple charging capacitors respectively connected to all first driving electrode groups and driving them simultaneously; in step 2B, the second driving electrode Rx1 and the second driving electrode Rx2 constitute the first second driving electrode group, the second driving electrode Rx3 and the second driving electrode Rx4 constitute the second second driving electrode group, the second driving electrode Rx5 and the second driving electrode Rx6 constitute the third second driving electrode group, and so on, using multiple charging capacitors respectively connected to all second driving electrode groups and driving them simultaneously.

[0142] In addition, in driving stage 1, the vertically arranged second driving electrodes Rx0, Rx1, Rx2, Rx3, ..., Rxn are simultaneously reused as sensing electrodes, and the sensing electrodes collect sensing signals to obtain coordinate information in one dimension. In driving stage 2, the horizontally arranged first driving electrodes Tx0, Tx1, Tx2, Tx3, ..., Txn are simultaneously reused as sensing electrodes, and the sensing electrodes collect sensing signals to obtain coordinate information in another dimension. Finally, by combining the coordinate information in the two dimensions obtained from driving stage 1 and driving stage 2, the coordinate position of the electromagnetic pen is calculated.

[0143] Therefore, referring to Figure 17, in order to achieve the above-mentioned driving effect on the electromagnetic touch screen, the electromagnetic touch driving device drives the electromagnetic touch screen according to driving stage 1 and driving stage 2, and the duration of each driving stage is the same; each driving stage includes a first sub-stage and a second sub-stage. For example, driving stage 1 in this embodiment includes a first sub-stage 1A and a second sub-stage 1B. The electromagnetic touch driving device includes multiple first driving terminals, which are used to output first driving voltages to multiple first driving electrodes respectively. The number of first driving terminals is M, where M is an even number. The electromagnetic touch driving device also includes M / 2 charging capacitors. In the first sub-stage 1A of driving stage 1, one end of the i-th charging capacitor is coupled to the (2i-1)-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, where i is a positive integer less than or equal to M / 2. In the second sub-stage 1B of driving stage 1, one end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i+1-th first driving terminal. Thus, in driving stage 1, the electromagnetic touch screen is driven by the M first driving terminals to the n+1 first driving electrodes, where M is greater than or equal to n+1, that is, the number of first driving terminals is not less than the number of first driving electrodes.

[0144] Similarly, the driving stage 2 of this embodiment includes a first sub-stage 2A and a second sub-stage 2B. The number of second driving terminals in the electromagnetic touch driving device is M, where M is an even number. The electromagnetic touch driving device also includes M / 2 charging capacitors. In the first sub-stage 2A of the driving stage 2, one end of the i-th charging capacitor is coupled to the (2i-1)-th second driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i-th second driving terminal, where i is a positive integer less than or equal to M / 2. In the second sub-stage 2B of the driving stage 2, one end of the i-th charging capacitor is coupled to the 2i-th second driving terminal, and the other end of the i-th charging capacitor is coupled to the (2i+1)-th second driving terminal. Thus, in step 2, the M-th second driving terminals drive the n+1 second driving electrodes of the electromagnetic touch screen, where M is greater than or equal to n+1, that is, the number of second driving terminals is not less than the number of second driving electrodes.

[0145] The electromagnetic touch driving device, by adopting the driving method of this embodiment, achieves the generation of electromagnetic fields in all areas corresponding to the first driving electrodes in driving stage 1, and in driving stage 2, achieves the generation of electromagnetic fields in all areas corresponding to the second driving electrodes. In driving stages 1 and 2, sensing electrodes are used to collect the sensing signals of the electromagnetic pen. Finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of the two dimensions obtained in driving stages 1 and 2. Furthermore, by controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the reversal of the signal sensed by the electromagnetic touch screen in the same driving stage.

[0146] Referring to Figure 18, which is a schematic diagram of the driving effect of an electromagnetic touch driving device on an electromagnetic touch screen obtained by modifying the embodiment of Figure 17, Figure 18 shows that in each driving stage of the present invention, two adjacent driving electrodes are driven, while in each driving stage of Figure 18, the charging capacitor drives two separated first driving electrodes. Specifically:

[0147] Driving phase 1 includes sub-phase 1A and sub-phase 1B. In sub-phase 1A, the first driving electrode Tx0 and the first driving electrode Txr constitute the first first driving electrode group, the first driving electrode Tx2r and the first driving electrode Tx3r constitute the second first driving electrode group, ..., the first driving electrode Tx2rk-2r and the first driving electrode Tx2rk-r constitute the kth first driving electrode group, and so on. Multiple charging capacitors are connected to all the first driving electrode groups and driven simultaneously. In sub-phase 1B, the first driving electrode Txr and the first driving electrode Tx2r constitute the first second driving electrode group, the first driving electrode Tx3r and the first driving electrode Tx4r constitute the second second driving electrode group, ..., the first driving electrode Tx2rk-r and the first driving electrode Tx2rk constitute the kth second driving electrode group, and so on. Multiple charging capacitors are connected to all the second driving electrode groups and driven simultaneously.

[0148] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the second driving electrode Rx0 and the second driving electrode Rxr constitute the first first driving electrode group, the second driving electrode Rx2r and the second driving electrode Rx3r constitute the second first driving electrode group, ..., the second driving electrode Rx2rk-2r and the second driving electrode Rx2rk-r constitute the kth first driving electrode group, and so on. Multiple charging capacitors are connected to all the first driving electrode groups and driven simultaneously. In sub-phase 2B, the second driving electrode Rxr and the second driving electrode Rx2r constitute the first second driving electrode group, the second driving electrode Rx3r and the second driving electrode Rx4r constitute the second second driving electrode group, ..., the second driving electrode Rx2rk-r and the second driving electrode Rx2rk constitute the kth second driving electrode group, and so on. Multiple charging capacitors are connected to all the second driving electrode groups and driven simultaneously.

[0149] Therefore, referring to Figure 18, in order to achieve the above-mentioned driving effect on the electromagnetic touch screen, the electromagnetic touch driving device drives the electromagnetic touch screen according to driving stage 1 and driving stage 2, and the duration of each driving stage is the same; each driving stage includes a first sub-stage and a second sub-stage. For example, driving stage 1 in this embodiment includes a first sub-stage 1A and a second sub-stage 1B. The electromagnetic touch driving device includes multiple first driving terminals, which are used to output a first driving voltage to multiple first driving electrodes respectively. The number of first driving terminals is M, where M is an even number. The electromagnetic touch driving device also includes M / 2r charging capacitors. In the first sub-stage 1A of driving stage 1, one end of the i-th charging capacitor is coupled to the 2ri-2r+1-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri-r+1-th first driving terminal, where i is a positive integer less than or equal to M / 2r. In the second sub-stage 1B of driving stage 1, one end of the i-th charging capacitor is coupled to the 2ri-r+1-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri+1-th first driving terminal. Thus, in driving stage 1, the electromagnetic touch screen is driven by the M first driving terminals to the n+1 first driving electrodes, where M is greater than or equal to n+1, that is, the number of first driving terminals is not less than the number of first driving electrodes.

[0150] Similarly, the driving stage 2 of this embodiment includes a first sub-stage 2A and a second sub-stage 2B. The number of second driving terminals in the electromagnetic touch driving device is M, where M is an even number. The electromagnetic touch driving device also includes M / 2 charging capacitors. In the first sub-stage 2A of the driving stage 2, one end of the i-th charging capacitor is coupled to the 2ri-2r+1-th second driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri-r+1-th second driving terminal, where i is a positive integer less than or equal to M / 2. In the second sub-stage 2B of the driving stage 2, one end of the i-th charging capacitor is coupled to the 2ri-r+1-th second driving terminal, and the other end of the i-th charging capacitor is coupled to the 2ri+1-th second driving terminal. Thus, in step 2, the electromagnetic touch screen is driven by the M second driving terminals to the n+1 second driving electrodes, where M is greater than or equal to n+1, that is, the number of second driving terminals is not less than the number of second driving electrodes.

[0151] The electromagnetic touch driving device, by adopting the driving method of this embodiment, achieves the generation of electromagnetic fields in all areas corresponding to the first driving electrodes in driving stage 1, and in driving stage 2, achieves the generation of electromagnetic fields in all areas corresponding to the second driving electrodes. In driving stages 1 and 2, sensing electrodes are used to collect the sensing signals of the electromagnetic pen. Finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of the two dimensions obtained in driving stages 1 and 2. Furthermore, by controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the reversal of the signal sensed by the electromagnetic touch screen in the same driving stage.

[0152] Referring to Figure 19, which is a schematic diagram of the driving effect of an electromagnetic touch driving device on an electromagnetic touch screen provided by an embodiment of the present invention, based on a modification of the embodiment in Figure 17 or Figure 18, in each driving stage of Figure 17 or Figure 18, two driving electrodes with a fixed interval are driven. However, in each driving stage of Figure 19, the charging capacitor drives two first driving electrodes with a random interval. Specifically:

[0153] Driving phase 1 includes sub-phase 1A and sub-phase 1B. In sub-phase 1A, the first driving electrode Tx0 and the first driving electrode Txa constitute the first first driving electrode group, the first driving electrode Txb and the first driving electrode Txc constitute the second first driving electrode group, the first driving electrode Txd and the first driving electrode Txe constitute the third first driving electrode group, and so on. The intervals between 0 and a, b and c, d and e are random. Multiple charging capacitors are connected to all the first driving electrode groups and driven simultaneously. In sub-phase 1B, the first driving electrode Txa and the first driving electrode Txb constitute the first second driving electrode group, the first driving electrode Txc and the first driving electrode Txd constitute the second second driving electrode group, the first driving electrode Txe and the first driving electrode Txf constitute the third second driving electrode group, and so on. The intervals between a and b, c and d, e and f are random. Multiple charging capacitors are connected to all the second driving electrode groups and driven simultaneously.

[0154] Driving phase 2 includes sub-phase 2A and sub-phase 2B. In sub-phase 2A, the second driving electrode Rx0 and the second driving electrode Rxa constitute the first first driving electrode group, the second driving electrode Rxb and the second driving electrode Rxc constitute the second first driving electrode group, the second driving electrode Rxd and the second driving electrode Rxe constitute the third first driving electrode group, and so on. The intervals between 0 and a, b and c, d and e are random. Multiple charging capacitors are connected to all the first driving electrode groups and driven simultaneously. In sub-phase 2B, the second driving electrode Rxa and the second driving electrode Rxb constitute the first second driving electrode group, the second driving electrode Rxc and the second driving electrode Rxd constitute the second second driving electrode group, the second driving electrode Rxe and the second driving electrode Rxf constitute the third second driving electrode group, and so on. The intervals between a and b, c and d, e and f are random. Multiple charging capacitors are connected to all the second driving electrode groups and driven simultaneously.

[0155] Therefore, referring to Figure 19, in order to achieve the above-mentioned driving effect on the electromagnetic touch screen, the electromagnetic touch driving device drives the electromagnetic touch screen according to driving stage 1 and driving stage 2, with each driving stage lasting for the same duration; the electromagnetic touch driving device includes multiple first driving terminals, which are used to output first driving voltages to multiple first driving electrodes respectively; the electromagnetic touch driving device also includes multiple charging capacitors; each driving stage includes a first sub-stage and a second sub-stage, for example:

[0156] The driving stage 1 of this embodiment includes a first sub-stage 1A and a second sub-stage 1B. In the first sub-stage 1A of the driving stage 1, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first driving terminals that have not yet been coupled to the first i-1 charging capacitors, the first x first driving terminals are selected, one end of the i-th charging capacitor is coupled to the first first driving terminal of the x first driving terminals, and the other end of the i-th charging capacitor is coupled to the last first driving terminal of the x first driving terminals. In the second sub-stage 1B of the driving stage 1, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first i-1 charging capacitors that have not yet been coupled to the first driving terminals, the first x first driving terminals are selected, one end of the i-th charging capacitor is coupled to the first first driving terminal of the x first driving terminals, and the other end of the i-th charging capacitor is coupled to the last first driving terminal of the x first driving terminals. In the first driving terminals that have not yet been coupled in the first sub-stage, the first y driving terminals are selected. One end of the i-th charging capacitor is coupled to the first driving terminal of the y driving terminals, and the other end of the i-th charging capacitor is coupled to the last driving terminal of the y driving terminals. In sub-stage 1A, the number x of the first driving terminals corresponding to different charging capacitors is different, and in sub-stage 1B, the number y of the first driving terminals corresponding to different charging capacitors is different. Thus, in driving stage 1, multiple first driving terminals drive multiple first driving electrodes of the electromagnetic touch screen, wherein the number of first driving terminals is not less than the number of first driving electrodes.

[0157] In this embodiment, the driving stage 2 includes a first sub-stage 2A and a second sub-stage 2B. In the first sub-stage 2A of driving stage 2, for the i-th charging capacitor, according to the arrangement order of the multiple second driving terminals, among the first i-1 charging capacitors that have not yet been coupled, x second driving terminals are selected, and one end of the i-th charging capacitor is coupled to the first second driving terminal of the x second driving terminals, and the other end of the i-th charging capacitor is coupled to the last second driving terminal of the x second driving terminals. In the second sub-stage 2B of driving stage 2, for the i-th charging capacitor, according to the arrangement order of the multiple second driving terminals, among the first i-1 charging capacitors that have not yet been coupled, x second driving terminals are selected, and one end of the i-th charging capacitor is coupled to the first second driving terminal of the x second driving terminals, and the other end of the i-th charging capacitor is coupled to the last second driving terminal of the x second driving terminals. Among the uncoupled second driving terminals that have not been coupled in the first sub-stage, the first y second driving terminals are selected. One end of the i-th charging capacitor is coupled to the first second driving terminal of the y second driving terminals, and the other end of the i-th charging capacitor is coupled to the last second driving terminal of the y second driving terminals. In sub-stage 2A, the number x of the second driving terminals corresponding to different charging capacitors has a different value, and in sub-stage 2B, the number y of the second driving terminals corresponding to different charging capacitors has a different value. Thus, in driving stage 2, the multiple second driving terminals drive the multiple second driving electrodes of the electromagnetic touch screen, wherein the number of second driving terminals is not less than the number of second driving electrodes.

[0158] The electromagnetic touch driving device, by adopting the driving method of this embodiment, achieves the generation of electromagnetic fields in all areas corresponding to the first driving electrodes in driving stage 1, and in driving stage 2, achieves the generation of electromagnetic fields in all areas corresponding to the second driving electrodes. In driving stages 1 and 2, sensing electrodes are used to collect the sensing signals of the electromagnetic pen. Finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of the two dimensions obtained in driving stages 1 and 2. Furthermore, by controlling the connection of the charging capacitor in each driving stage, the current direction in each driving coil that generates current is consistent in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding the reversal of the signal sensed by the electromagnetic touch screen in the same driving stage.

[0159] In addition, a second aspect of the present invention provides an electromagnetic touch screen, including the electromagnetic touch driving device in the first aspect or any possible implementation of the first aspect; and a plurality of first driving electrodes arranged along a first direction, one end of the plurality of first driving electrodes being coupled to each other, and the other end of the plurality of first driving electrodes being coupled to the electromagnetic touch driving device.

[0160] In one possible implementation, a plurality of sensing coils arranged along a second direction perpendicular to the first direction are further included. The position of the electromagnetic pen is sensed by sensing changes in the electromagnetic field within each sensing coil. It should be noted that the sensing coils in this embodiment can be constructed by multiplexing the second driving electrodes from the various embodiments described above.

[0161] In addition, a third aspect of the present invention provides an electronic device including the electromagnetic touch screen described in the second aspect or any possible implementation thereof.

[0162] In addition, a fourth aspect of the present invention provides a touch system including the electromagnetic touch screen described in the third aspect above, and an electromagnetic pen.

[0163] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatuses.

[0164] It should be understood that in this invention, "at least one (item)" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0165] It should be understood that in the description of the embodiments of the present invention, multiple (or more) means two or more, greater than, less than, and exceeding are understood to exclude the number itself, while above, below, and within are understood to include the number itself.

[0166] In the embodiments provided by this invention, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0167] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0168] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units. It should also be understood that the various implementation methods provided in the embodiments of the present invention can be arbitrarily combined to achieve different technical effects.

[0169] The above provides a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above implementation methods. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. An electromagnetic touch-driven device, characterized in that, For coupling to an electromagnetic touch screen, the electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, one end of the plurality of first driving electrodes being coupled to each other, the electromagnetic touch driving device includes: Multiple first driving terminals are provided for outputting a first driving voltage to the other end of the multiple first driving electrodes, wherein any two first driving electrodes constitute a driving coil, and a current is generated in a portion of the driving coils to generate an electromagnetic field, thereby sensing the position of the electromagnetic pen by sensing the change in the electromagnetic field caused by the electromagnetic pen on the electromagnetic touch screen, wherein the electromagnetic touch driving device operates in driving stages, and the first driving terminals ensure that the current direction in each driving coil that generates the current is consistent in each driving stage.

2. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device further includes a plurality of first driving sources respectively coupled to the plurality of first driving terminals, for outputting a plurality of first driving voltages to the plurality of first driving terminals respectively, wherein, in the i-th driving stage, the plurality of first driving sources respectively output equal positive first driving voltages to the i-th first driving terminals, and the plurality of first driving sources respectively output equal negative first driving voltages to the remaining first driving terminals.

3. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device further includes a plurality of first driving sources coupled to the plurality of first driving terminals respectively, for outputting a plurality of first driving voltages to the plurality of first driving terminals respectively, wherein the plurality of first driving voltages decrease sequentially along the arrangement direction of the plurality of first driving terminals, and in the i-th driving stage, the difference between the i-th first driving voltage and the (i+1)-th first driving voltage along the arrangement direction is greater than the difference between any other first driving voltage and the next first driving voltage.

4. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch screen further includes a plurality of second driving electrodes arranged along a second direction, one end of the plurality of second driving electrodes being coupled to each other, and the second direction being perpendicular to the first direction; the electromagnetic touch driving device further includes a plurality of second driving ends and a plurality of second driving sources, the plurality of second driving ends being used to output a second driving voltage to the other end of the plurality of second driving electrodes respectively, and the plurality of second driving sources being used to output a plurality of second driving voltages to the plurality of second driving ends respectively; The driving phase includes a first driving phase and a second driving phase; In the first driving phase, the i-th first driving voltage output by the i-th first driving source to the i-th first driving terminal is greater than the i+1-th first driving voltage output by the (i+1)-th first driving source to the (i+1)-th first driving terminal. In the second driving phase, the i-th second driving voltage output by the i-th second driving source to the i-th second driving terminal is greater than the i+1-th second driving voltage output by the (i+1)-th second driving source to the (i+1)-th second driving terminal.

5. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively.

6. The electromagnetic touch drive device according to claim 5, characterized in that, The driving phase includes a first sub-phase and a second sub-phase, and the charging capacitor includes a first charging capacitor and a second charging capacitor, wherein the polarities of the first charging capacitor and the second charging capacitor are opposite. In the first sub-stage of the i-th driving stage, the anode and cathode of the first charging capacitor are respectively coupled to the i-th first driving terminal and the (i+1)-th first driving terminal; In the second sub-stage of the i-th driving stage, the anode and cathode of the second charging capacitor are respectively coupled to the i-th first driving terminal and the (i+1)-th first driving terminal.

7. The electromagnetic touch drive device according to claim 6, characterized in that, The electromagnetic touch drive device further includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a drive switching circuit corresponding to each of the first drive electrodes. The drive switching circuit includes a first switch and a second switch. In the first sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple the positive terminal of the first charging capacitor to the i-th first driving terminal, the second single-pole double-throw switch and the second switch couple the negative terminal of the first charging capacitor to the (i+1)-th first driving terminal, the third single-pole double-throw switch couples the negative terminal of the second charging capacitor to the reference voltage, and the fourth single-pole double-throw switch grounds the positive terminal of the second charging capacitor. In the second sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple the positive terminal of the second charging capacitor to the i-th first driving terminal, the second single-pole double-throw switch and the second switch couple the negative terminal of the second charging capacitor to the (i+1)-th first driving terminal, the third single-pole double-throw switch couples the positive terminal of the first charging capacitor to the reference voltage, and the fourth single-pole double-throw switch grounds the negative terminal of the first charging capacitor.

8. The electromagnetic touch drive device according to claim 5, characterized in that, The driving phase includes a first sub-phase and a second sub-phase; In the first sub-stage of the i-th driving stage, the positive and negative terminals of the charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively. In the second sub-stage of the i-th driving stage, each of the first driving terminals is grounded.

9. The electromagnetic touch drive device according to claim 5, characterized in that, The driving phase includes h sub-phases, and the charging capacitors include h charging capacitors with different charging capacities, where h is a positive integer greater than 2. In the kth sub-stage of the i-th driving stage, the positive and negative terminals of the k-th charging capacitor are coupled to the i-th first driving terminal and the (i+1)-th first driving terminal, respectively, where k is a positive integer less than or equal to h.

10. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are respectively coupled to the i-th first driving terminal and the (i+m)-th first driving terminal, where m is a positive integer greater than or equal to 2.

11. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device further includes a charging capacitor, wherein, in the i-th driving stage, the positive and negative terminals of the charging capacitor are respectively coupled to the p-th first driving terminal and the p+q-th first driving terminal, where p is a positive integer and is different in each driving stage, and q is a positive integer and is different in each driving stage, and each first driving terminal is coupled to the charging capacitor at least in one driving stage.

12. The electromagnetic touch drive device according to claim 1, characterized in that, The number of the first driving ends is M, and the electromagnetic touch driving device also includes M / 2 charging capacitors. The driving stage includes a first sub-stage and a second sub-stage, where M is an even number. In the first sub-stage, one end of the i-th charging capacitor is coupled to the 2i-1-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, where i is a positive integer less than or equal to M / 2. In the second sub-stage, one end of the i-th charging capacitor is coupled to the 2i-th first driving terminal, and the other end of the i-th charging capacitor is coupled to the 2i+1-th first driving terminal.

13. The electromagnetic touch drive device according to claim 1, characterized in that, The number of the first driving ends is M, and the electromagnetic touch driving device also includes M / 2r charging capacitors. The driving stage includes a first sub-stage and a second sub-stage, where M is an even number. In the first sub-stage, one end of the i-th charging capacitor is coupled to the first driving terminal at the 2ri-2r+1th position, and the other end of the i-th charging capacitor is coupled to the first driving terminal at the 2ri-r+1th position, where i is a positive integer less than or equal to M / 2r. In the second sub-stage, one end of the i-th charging capacitor is coupled to the first driving terminal at the 2ri-r+1th position, and the other end of the i-th charging capacitor is coupled to the first driving terminal at the 2ri+1th position.

14. The electromagnetic touch drive device according to claim 1, characterized in that, The electromagnetic touch driving device also includes multiple charging capacitors, and the driving stage includes a first sub-stage and a second sub-stage. In the first sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first driving terminals that have not yet been coupled to the first i-1 charging capacitors, select the first x first driving terminals in the order that are ... In the second sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving terminals, among the first driving terminals that have not yet been coupled to the first i-1 charging capacitors and have not been coupled to the first sub-stage, the first y first driving terminals are selected, one end of the i-th charging capacitor is coupled to the first first driving terminal of the y first driving terminals, and the other end of the i-th charging capacitor is coupled to the last first driving terminal of the y first driving terminals.

15. An electromagnetic touch screen, characterized in that, include: The electromagnetic touch drive device as described in any one of claims 1 to 14; In addition, a plurality of first driving electrodes are arranged along a first direction, one end of the plurality of first driving electrodes is coupled to each other, and the other end of the plurality of first driving electrodes is coupled to the electromagnetic touch driving device.

16. The electromagnetic touch screen according to claim 15, characterized in that, It also includes a plurality of sensing coils arranged along a second direction perpendicular to the first direction, wherein the position of the electromagnetic pen is sensed by sensing changes in the electromagnetic field within each of the sensing coils.

17. An electronic device, characterized in that, Including the electromagnetic touch screen as described in claim 15 or 16.

18. A touch system, characterized in that, include: The electromagnetic touch screen as described in claim 15 or 16; and the electromagnetic pen.

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