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

Abstract

The embodiment of the utility model discloses an electromagnetic touch control driving device, an electromagnetic touch control screen, electronic equipment and a touch control system, the electromagnetic touch control screen comprises a plurality of first driving electrodes which are arranged along a first direction, and one ends of the plurality of first driving electrodes are mutually coupled. The electromagnetic touch control driving device comprises a plurality of first driving ends used for outputting first driving voltage to the other ends of the first driving electrodes respectively, any two first driving electrodes form a driving coil, current is generated in part of the driving coils to generate an electromagnetic field, and the electromagnetic field is used for driving the electromagnetic touch control device. The electromagnetic touch control driving device is operated according to driving stages, in each driving stage, the directions of currents in the driving coils generating the currents are consistent, and the positions of the electromagnetic pens are sensed by sensing the changes of the electromagnetic fields caused by the electromagnetic pens on the electromagnetic touch control screen. According to the invention, the anti-phase of the received voltage signal when the electromagnetic touch screen senses the electromagnetic pen can be avoided, and the accuracy of position detection of the electromagnetic pen can be improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electromagnetic touch technology, in particular to an electromagnetic touch driving device, an electromagnetic touch screen, an electronic device and a touch system. BACKGROUND

[0002] EMR (Electro Magnetic Resonancey) technology is mainly used in scenarios such as a digitizer and an ink screen, and has advantages of high precision, self-contained writing experience and good stability.

[0003] At present, the EMR technology is gradually applied to a mobile phone or a tablet, and is used for sensing a position of an electromagnetic pen on the mobile phone or the tablet, so as to sense a user input. A plurality of parallel driving electrodes are arranged in or under a touch panel, and are used for providing a driving signal. A plurality of sensing electrodes perpendicular to the driving electrodes are arranged, and are used for sensing the position of the electromagnetic pen based on a change of a sensed electromagnetic field. Since a screen frame of the mobile phone and the tablet is narrow, a short circuit is made at one end of the driving electrodes and the sensing electrodes of the touch screen on the same side, so that the number of wires of the touch screen can be greatly reduced. However, when the driving electrodes of the touch screen are driven, due to the existence of a parasitic capacitance between the electrodes and a system ground, a current is generated from the driving electrodes to the system ground through the parasitic capacitance, which often causes that a voltage or a current sensed when the electromagnetic pen slides on the screen cannot generate a stable envelope, and thus the position detection of the electromagnetic pen is inaccurate. CONTENT

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] The embodiment of the utility model provides a kind of electromagnetic touch driving device, electromagnetic touch screen, electronic device and touch system, can improve the accuracy of electromagnetic pen position detection.

[0006] In a first aspect, the embodiment of the utility model provides an electromagnetic touch driving device, for coupling to electromagnetic touch screen, the electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, one end of a plurality of the first driving electrodes is coupled to each other, the electromagnetic touch driving device includes:

[0007] a plurality of first driving ends for outputting first driving voltages to the other ends of the plurality of first driving electrodes respectively, wherein any two of the first driving electrodes form a driving coil, and a current is generated in a part of the driving coils to generate an electromagnetic field, so that the position of the electromagnetic pen is sensed by sensing the change of 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 ends are configured to make the directions of the currents in the driving coils generating the currents consistent in each driving stage.

[0008] In the embodiment, the electromagnetic touch driving device outputs first driving voltages to the plurality of first driving electrodes of the electromagnetic touch screen through the plurality of first driving ends, so that a current is generated in a part of the driving coils formed by two first driving electrodes to generate an electromagnetic field under the action of the first driving voltages. When the electromagnetic pen is placed in the area corresponding to the driving coil, the electromagnetic field in the area will change, so that the position of the electromagnetic pen can be sensed by sensing the change of the electromagnetic field in the corresponding area. The electromagnetic touch driving device operates in driving stages, and controls the first driving voltages output by the first driving ends to make the directions of the currents in the driving coils generating the currents consistent in each driving stage, so that the changes of the electromagnetic fields sensed by the electromagnetic touch screen are consistent, thereby avoiding the voltage signals received by the electromagnetic touch screen when the electromagnetic pen is sensed from being reversed, and improving the accuracy of the position detection of the electromagnetic pen.

[0009] In a possible implementation, the electromagnetic touch driving device further includes a plurality of first driving sources coupled to the plurality of first driving ends respectively, for outputting a plurality of first driving voltages to the plurality of first driving ends respectively, wherein in the i th driving stage, the plurality of first driving sources output equal positive first driving voltages to the first i driving ends respectively, and output equal negative first driving voltages to the remaining first driving ends respectively.

[0010] In the implementation, the electromagnetic field of the corresponding area is the strongest in each driving stage, and the corresponding area shifts along the first direction with the jump of the driving stages, so that the position of the electromagnetic pen can be determined by sensing the changes of the electromagnetic fields at different times.

[0011] In a possible implementation, the electromagnetic touch driving device further includes a plurality of first driving sources coupled to the plurality of first driving ends respectively, for outputting a plurality of first driving voltages to the plurality of first driving ends respectively, wherein the plurality of first driving voltages decrease sequentially along an arrangement direction of the plurality of first driving ends, and a difference between an i th first driving voltage and an i+1 th first driving voltage along the arrangement direction is greater than a difference between any other first driving voltage and a next first driving voltage.

[0012] In the implementation, the electromagnetic field intensity of the corresponding region is maximum in each driving stage, and the corresponding region shifts along the first direction with the driving stage jumping, so that the position of the electromagnetic pen can be determined by sensing the change of the electromagnetic field at different times.

[0013] In a possible implementation, 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 configured to output second driving voltages to the other end of the plurality of second driving electrodes, and the plurality of second driving sources being configured to output the plurality of second driving voltages to the plurality of second driving ends respectively.

[0014] The driving stages include a first driving stage and a second driving stage.

[0015] In the first driving stage, an i th first driving voltage output by an i th first driving source to an i th first driving end is greater than an i+1 th first driving voltage output by an i+1 th first driving source to an i+1 th first driving end; and in the second driving stage, an i th second driving voltage output by an i th second driving source to an i th second driving end is greater than an i+1 th second driving voltage output by an i+1 th second driving source to an i+1 th second driving end.

[0016] In the implementation, the two-dimensional coordinate information of the electromagnetic pen can be acquired by driving the driving electrodes in two driving stages respectively, so as to calculate the coordinate position of the electromagnetic pen.

[0017] In a possible implementation, the electromagnetic touch driving device further includes a charging capacitor, wherein in an i th driving stage, a positive electrode and a negative electrode of the charging capacitor are coupled to an i th first driving end and an i+1 th first driving end respectively.

[0018] In a possible implementation, the driving stage includes a first sub-stage and a second sub-stage, and the charging capacitor includes a first charging capacitor and a second charging capacitor, polarities of the first charging capacitor and the second charging capacitor being opposite;

[0019] In the first sub-stage of the i-th driving stage, an anode and a cathode of the first charging capacitor are coupled to the i-th first driving end and the i+1-th first driving end, respectively;

[0020] In the second sub-stage of the i-th driving stage, an anode and a cathode of the second charging capacitor are coupled to the i-th first driving end and the i+1-th first driving end, respectively.

[0021] In a possible implementation, the electromagnetic touch driving apparatus 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 including a first switch and a second switch;

[0022] In the first sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple a positive electrode of the first charging capacitor to the i-th first driving end, the second single-pole double-throw switch and the second switch couple a negative electrode of the first charging capacitor to the i+1-th first driving end, the third single-pole double-throw switch couples a negative electrode of the second charging capacitor to a reference voltage, and the fourth single-pole double-throw switch grounds a positive electrode of the second charging capacitor;

[0023] In the second sub-stage of the i-th driving stage, the first single-pole double-throw switch and the first switch couple a positive electrode of the second charging capacitor to the i-th first driving end, the second single-pole double-throw switch and the second switch couple a negative electrode of the second charging capacitor to the i+1-th first driving end, the third single-pole double-throw switch couples a positive electrode of the first charging capacitor to the reference voltage, and the fourth single-pole double-throw switch grounds a negative electrode of the first charging capacitor.

[0024] In a possible implementation, the driving stage includes a first sub-stage and a second sub-stage;

[0025] In the first sub-stage of the i-th driving stage, a positive electrode and a negative electrode of the charging capacitor are coupled to the i-th first driving end and the i+1-th first driving end, respectively;

[0026] In the second sub-stage of the i-th driving stage, each of the first driving ends is grounded.

[0027] In a possible implementation, the driving stage includes h sub-stages, the charging capacitor includes h charging capacitors with different charging capacities, and h is a positive integer greater than 2.

[0028] In the kth sub-stage of the ith driving stage, the positive electrode and the negative electrode of the kth charging capacitor are coupled to the ith first driving end and the ith+1 first driving end respectively, where k is a positive integer less than or equal to h.

[0029] In a possible implementation, the electromagnetic touch driving apparatus further includes a charging capacitor, and in the ith driving stage, the positive electrode and the negative electrode of the charging capacitor are coupled to the ith first driving end and the ith+m first driving end respectively, where m is a positive integer greater than or equal to 2.

[0030] In a possible implementation, the electromagnetic touch driving apparatus further includes a charging capacitor, and in the ith driving stage, the positive electrode and the negative electrode of the charging capacitor are coupled to the pth first driving end and the pth+q first driving end respectively, where p is a positive integer and is different in each driving stage, q is a positive integer and is different in each driving stage, and each first driving end is coupled to the charging capacitor in at least one driving stage.

[0031] In a possible implementation, the number of the first driving ends is M, the electromagnetic touch driving apparatus further includes M / 2 charging capacitors, the driving stage includes a first sub-stage and a second sub-stage, and M is an even number.

[0032] In the first sub-stage, one end of the ith charging capacitor is coupled to the 2i-1th first driving end, and the other end of the ith charging capacitor is coupled to the 2i th first driving end, where i is a positive integer less than or equal to M / 2.

[0033] In the second sub-stage, one end of the ith charging capacitor is coupled to the 2i th first driving end, and the other end of the ith charging capacitor is coupled to the 2i+1th first driving end.

[0034] In a possible implementation, the number of the first driving ends is M, the electromagnetic touch driving apparatus further includes M / 2r charging capacitors, the driving stage includes a first sub-stage and a second sub-stage, and M is an even number.

[0035] In the first sub-stage, one end of the ith charging capacitor is coupled to the 2ri-2r+1th first driving end, and the other end of the ith charging capacitor is coupled to the 2ri-r+1th first driving end, where i is a positive integer less than or equal to M / 2r.

[0036] In the second sub-stage, one end of the i-th charging capacitor is coupled to the 2ri-r+1-th first driving end, and the other end of the i-th charging capacitor is coupled to the 2ri+1-th first driving end.

[0037] In a 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.

[0038] In the first sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving ends, x first driving ends arranged in front are selected from the first driving ends that have not been coupled by the previous i-1 charging capacitors, one end of the i-th charging capacitor is coupled to the first first driving end of the x first driving ends, and the other end of the i-th charging capacitor is coupled to the last first driving end of the x first driving ends.

[0039] In the second sub-stage, for the i-th charging capacitor, according to the arrangement order of the plurality of first driving ends, y first driving ends arranged in front are selected from the first driving ends that have not been coupled by the previous i-1 charging capacitors and have not been coupled in the first sub-stage, one end of the i-th charging capacitor is coupled to the first first driving end of the y first driving ends, and the other end of the i-th charging capacitor is coupled to the last first driving end of the y first driving ends.

[0040] In a second aspect, the utility model embodiment provides an electromagnetic touch screen, including the electromagnetic touch driving device in the above first aspect or any possible implementation manner 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 is coupled to each other, and the other end of the plurality of first driving electrodes is coupled to the electromagnetic touch driving device.

[0041] In a possible implementation, the electromagnetic touch screen further includes a plurality of sensing coils arranged along a second direction, the second direction being perpendicular to the first direction, and the position of the electromagnetic pen is sensed by sensing changes in the electromagnetic field in each of the sensing coils.

[0042] In a third aspect, the utility model embodiment provides an electronic device including the electromagnetic touch screen in the above second aspect or any possible implementation manner of the second aspect.

[0043] In a fourth aspect, the utility model embodiment provides a touch system including the electromagnetic touch screen in the above third aspect and an electromagnetic pen.

[0044] The other features and advantages of the present application will be described in the following description and become apparent from the description, or can be learned from practice of the present application. The objectives and other advantages of the present application can be achieved and obtained by means of the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings are used to provide further understanding of the technical scheme of the present application, and constitute a part of the description, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation to the technical scheme of the present application.

[0046] Figure 1 An electrode structure schematic diagram of the touch screen provided by the embodiment of the present application;

[0047] Figure 2 A structure schematic diagram of the touch screen provided by the embodiment of the present application;

[0048] Figure 3 An electrode structure schematic diagram of the touch screen provided by another embodiment of the present application;

[0049] Figure 4 An electrode structure schematic diagram of the touch screen provided by another embodiment of the present application; Figure 1 A loop current and magnetic field direction schematic diagram of the touch screen in the driving of the electrode Tx1 and the electrode Tx2;

[0050] Figure 5 A driving effect schematic diagram of the electromagnetic touch screen by the electromagnetic touch driving device provided by the embodiment of the present application;

[0051] Figure 6 A structure schematic diagram of the electromagnetic touch driving device provided by the embodiment of the present application;

[0052] Figure 7 A structure schematic diagram of the driving source provided by the embodiment of the present application;

[0053] Figure 8 A driving effect schematic diagram of the electromagnetic touch screen by the electromagnetic touch driving device provided by another embodiment of the present application;

[0054] Figure 9 A structure schematic diagram of the electromagnetic touch driving device provided by another embodiment of the present application;

[0055] Figure 10 A driving effect schematic diagram of the electromagnetic touch screen by the electromagnetic touch driving device provided by another embodiment of the present application;

[0056] Figure 11This is a schematic diagram illustrating the driving effect of an electromagnetic touch drive device provided in one embodiment of the present invention, which uses a charging capacitor to drive an electromagnetic touch screen.

[0057] Figure 12 This is a schematic diagram of the structure of an electromagnetic touch drive device provided in another embodiment of the present invention;

[0058] Figure 13 This utility model is based on Figure 11 A schematic diagram illustrating the driving effect of an electromagnetic touch drive device on an electromagnetic touch screen, obtained by modifying the previous embodiment.

[0059] Figure 14 This utility model is based on Figure 11 A schematic diagram illustrating the driving effect of the electromagnetic touch drive device on the electromagnetic touch screen, obtained by modifying the previous embodiment.

[0060] Figure 15 This utility model is based on Figure 14 A schematic diagram illustrating the driving effect of an electromagnetic touch drive device on an electromagnetic touch screen, obtained by modifying the previous embodiment.

[0061] Figure 16 This utility model is based on Figure 11 A schematic diagram illustrating the driving effect of the electromagnetic touch drive device on the electromagnetic touch screen, obtained by modifying the previous embodiment.

[0062] Figure 17 This is a schematic diagram illustrating the driving effect of the electromagnetic touch driving device on the electromagnetic touch screen provided in another embodiment of the present invention.

[0063] Figure 18 This utility model is based on Figure 17 A schematic diagram illustrating the driving effect of an electromagnetic touch drive device on an electromagnetic touch screen, obtained by modifying the previous embodiment.

[0064] Figure 19 This utility model is based on Figure 17 or Figure 18 A schematic diagram illustrating the driving effect of an electromagnetic touch drive device on an electromagnetic touch screen, obtained by modifying the previous embodiment. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 only used to explain this utility model and are not intended to limit this utility model.

[0066] 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. Typically, the driving electrodes on the touchscreens of products like graphics tablets and e-ink displays form multiple independent driving coils, while the sensing electrodes 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 them together at one end on the same side—can significantly reduce the number of wires on the touchscreen. For example, see reference... Figure 1 As shown, 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 can be understood 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.

[0067] Furthermore, touchscreens in electronic devices such as mobile phones and tablets generally integrate capacitive sensing technology. The electrodes used in capacitive touch sensing and those used in 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 [reference to...]. Figure 2As shown, the electrodes for capacitive touch detection are arranged on the capacitive detection layer 110 above the display layer 120, and the electrodes for electromagnetic touch detection are arranged on the electromagnetic detection layer 130 below the display layer 120; when the electrodes for capacitive touch detection and the electrodes for electromagnetic touch detection are compatible, the compatible scheme of the two can refer to Figure 3 As shown, the upper ends of any two adjacent electrodes among the electrodes Tx0, Tx1, Tx2, Tx3,... and Txn arranged longitudinally on the touch screen are connected through switches; the left ends of any two adjacent electrodes among the electrodes Rx0, Rx1, Rx2, Rx3,... and Rxn arranged transversely on the touch screen are connected through switches, i.e., the upper end of the electrode Tx0 is connected to the upper end of the electrode Tx1 through the switch Kt1, the upper end of the electrode Tx1 is connected to the upper end of the electrode Tx2 through the switch Kt2, the upper end of the electrode Tx2 is connected to the upper end of the electrode Tx3 through the switch Kt3,..., and the upper end of the electrode Txn-1 is connected to the upper end of the electrode Txn through the switch Ktn; the left end of the electrode Rx0 is connected to the left end of the electrode Rx1 through the switch Kr1, the left end of the electrode Rx1 is connected to the left end of the electrode Rx2 through the switch Kr2, the left end of the electrode Rx2 is connected to the left end of the electrode Rx3 through the switch Kr3,..., and the left end of the electrode Rxn-1 is connected to the left end of the electrode Rxn through the switch Krn. When all the switches in the touch screen are closed, the electrodes on the touch screen are used to implement electromagnetic touch detection; when all the switches are opened, the electrodes on the touch screen are used to implement capacitive touch detection. Figure 3

[0068] However, when the electrodes in the touch screen are driven to implement electromagnetic touch detection, due to the parasitic capacitance between the electrodes and the system ground, a current flows from the driven electrodes to the system ground through the parasitic capacitance, which often causes electromagnetic signals in different directions to be generated in different regions of the touch screen at the same corresponding moment, resulting in the detected voltages of the electromagnetic pen being reversed at different positions, and the detection positioning of the electromagnetic pen being complicated, and even the coordinates being unable to be calculated; or the voltage or current sensed by the electromagnetic pen when sliding on the screen cannot generate a stable envelope, resulting in inaccurate position detection of the electromagnetic pen; for example, refer to Figure 4 ​In the process of driving the driving coil composed of the electrode Tx1 and the electrode Tx2 by the driving source S, when the driving source S provides the driving voltage Vs+ to the electrode Tx1, the electrode Tx2 is grounded, thus a current loop of the driving source S-electrode Tx1-electrode Tx2-ground is generated, the current direction of the current loop is clockwise, thus the magnetic field generated between the electrode Tx1 and the electrode Tx2 is in the direction of the inside of the touch screen; at this time, the electrode Tx0 is grounded or suspended, if the electrode Tx0 is grounded, under the action of the driving source S, a current loop of the driving source S-electrode Tx1-electrode Tx0-ground is generated at the same time, the current direction of the current loop is counterclockwise, thus the magnetic field generated between the electrode Tx1 and the electrode Tx0 is in the direction of the outside of the touch screen; if the electrode Tx0 is suspended, under the action of the driving source S, a current loop of the driving source S-electrode Tx1-electrode Tx0 parasitic capacitor CL-ground is generated due to the parasitic capacitor CL between the electrode Tx0 and the system ground, the current direction of the current loop is counterclockwise, thus the magnetic field generated between the electrode Tx1 and the electrode Tx0 is in the direction of the outside of the touch screen. When the electrodes in the touch screen are driven, the magnetic field generated between the electrodes is shown in the figure, the electromagnetic pen is placed in the region between the electrode Tx0 and the electrode Tx1, and the magnetic field direction sensed in the region between the electrode Tx1 and the electrode Tx2 is different, which causes the voltage signal detected by the sensing coil composed of the sensing electrodes of the touch screen to be reversed, the detection positioning of the electromagnetic pen is complex, and even when the electromagnetic pen is placed on the electrode Tx1, the sensing coil cannot detect the voltage signal, and the coordinates of the electromagnetic pen cannot be calculated; and once the electromagnetic pen slides through the electrode Tx1, the jump of the sensed electromagnetic field is caused, the change of the electromagnetic field detected when the electromagnetic pen slides is no longer monotone rising or monotone falling, the voltage or current sensed when the electromagnetic pen slides on the screen cannot generate a stable envelope, and the position detection of the electromagnetic pen is inaccurate. Figure 4

[0069] Based on this, the utility model embodiment provides an electromagnetic touch driving device, an electromagnetic touch screen, an electronic equipment and a touch system, and the accuracy of electromagnetic pen position detection can be improved.

[0070] It should be noted that the driving source S is used Figure 1 or Figure 3 ​The electrode forms shown can have different driving and detecting modes when realizing touch detection of the electromagnetic pen on the touch screen. For example, the longitudinally arranged electrodes Tx0, Tx1, Tx2, Tx3, and Txn are only used as driving electrodes, the transversely arranged electrodes Rx0, Rx1, Rx2, Rx3, and Rxn are only used as sensing electrodes, the driving electrodes are polled and driven according to the arrangement order, all the sensing electrodes collect signals at the same time when driving each time, and after one round of polling and driving of all the driving electrodes, all the collected sensing signals are combined with the driving signals of the driving electrodes, so that coordinate calculation of the electromagnetic pen can be realized. In addition, the longitudinally arranged electrodes Tx0, Tx1, Tx2, Tx3, and Txn can be used as driving electrodes in the first time period to provide driving signals to the driving electrodes, the transversely arranged electrodes Rx0, Rx1, Rx2, Rx3, and Rxn are used as sensing electrodes at the same time in the first time period to collect sensing signals to obtain coordinate information of one dimension, the transversely arranged electrodes Rx0, Rx1, Rx2, Rx3, and Rxn are used as driving electrodes in the second time period to provide driving signals to the driving electrodes, and the longitudinally arranged electrodes Tx0, Tx1, Tx2, Tx3, and Txn are used as sensing electrodes at the same time in the second time period to collect sensing signals to obtain coordinate information of another dimension. Finally, the coordinate information of the two dimensions obtained in the first time period and the second time period is combined to calculate the coordinate position of the electromagnetic pen.

[0071] The first aspect of the embodiments of the utility model provides electromagnetic touch driving device, in above two different driving and detecting modes, can avoid when electromagnetic touch screen senses electromagnetic pen received voltage signal reverse phase, improve electromagnetic pen position detection accuracy, below respectively with different embodiment to its instruction.

[0072] Referring to Figure 5 , Figure 5This is a schematic diagram illustrating 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 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, wherein 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; 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 to form a comb-like structure. Figure 5 In this context, the first direction is longitudinal, but in other embodiments, the first direction can also be transverse. Figure 5 In this embodiment, 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 may also be coupled to each other.

[0073] 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.

[0074] Note that, as Figure 5 As shown, 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:

[0075] In driving phase 1 : the lower ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn receive positive first driving voltage Vs provided by the first driving ends coupled to the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn, respectively, while the lower ends of the first driving electrodes Tx1, Tx2, Tx3,... and Txn receive negative first driving voltage -Vs provided by the first driving ends coupled to the first driving electrodes Tx1, Tx2, Tx3,... and Txn, respectively, simultaneously.

[0076] In driving phase 2: the lower ends of the first driving electrodes Tx0 and Tx1 receive positive first driving voltage Vs provided by the first driving ends coupled to the first driving electrodes Tx0 and Tx1, respectively, simultaneously, while the lower ends of the first driving electrodes Tx2, Tx3,... and Txn receive negative first driving voltage -Vs provided by the first driving ends coupled to the first driving electrodes Tx2, Tx3,... and Txn, respectively, simultaneously. ...

[0078] In driving phase n-1 : the lower ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn-2 receive positive first driving voltage Vs provided by the first driving ends coupled to the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn-2, respectively, simultaneously, while the lower ends of the first driving electrodes Txn-1 and Txn receive negative first driving voltage -Vs provided by the first driving ends coupled to the first driving electrodes Txn-1 and Txn, respectively, simultaneously.

[0079] In driving phase n: the lower ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn-1 receive positive first driving voltage Vs provided by the first driving ends coupled to the first driving electrodes Tx0, Tx1, Tx2, Tx3,... and Txn-1, respectively, simultaneously, while the lower end of the first driving electrode Txn receives negative first driving voltage -Vs provided by the first driving end coupled to the first driving electrode Txn.

[0080] It can be understood that, in the above driving stage 1, the driving coil formed by the first driving electrode TxO and the first driving electrode TxI 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 TxO and the first driving electrode TxI; similarly, the driving coil formed by the first driving electrode TxO 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 TxO and the first driving electrode Tx2, and the region between the first driving electrode TxO and the first driving electrode Tx2 generating an electromagnetic field includes the region between the first driving electrode TxO and the first driving electrode TxI generating an electromagnetic field; the case of the first driving electrode TxO and the first driving electrode Tx3,..., the case of the first driving electrode TxO and the first driving electrode Txn are similar to the case of the first driving electrode TxO and the first driving electrode Tx2; therefore, under the superposition of electromagnetic fields in all regions, in the above driving stage 1, the electromagnetic field intensity in the region between the first driving electrode TxO and the first driving electrode TxI is the largest; correspondingly, in the above driving stage 2, the electromagnetic field intensity in the region between the first driving electrode TxI and the first driving electrode Tx2 is the largest;..., in the above driving stage n-1, the electromagnetic field intensity in the region between the first driving electrode Txn-2 and the first driving electrode Txn-1 is the largest, and in the above driving stage n, the electromagnetic field intensity in the region between the first driving electrode Txn-1 and the first driving electrode Txn is the largest.

[0081] In addition, it should be further pointed out that, in the above various driving stages, no current is generated in some driving coils formed by two first driving electrodes, for example, the driving coil formed by the first driving electrode TxI and the first driving electrode Tx2 in the driving stage 1, the driving coil formed by the first driving electrode Tx2 and the first driving electrode Tx3 in the driving stage 1,..., the driving coil formed by the first driving electrode Txn-1 and the first driving electrode Txn in the driving stage 1. Since the two first driving electrodes of these driving coils obtain the same first driving voltage, which is the equal first driving voltage -Vs, no current is generated in these driving coils; for example, the driving coil formed by the first driving electrode TxO and the first driving electrode TxI in the driving stage 2, since the two first driving electrodes obtain the same first driving voltage, which is the equal first driving voltage Vs, no current is generated in this driving coil; the cases of other driving coils obtaining the same two first driving voltages are similar.

[0082] The electromagnetic touch screen includes n+1 first driving electrodes, and n times of driving are needed in a complete sensing cycle, each time corresponding to one driving stage, and the duration of each driving stage is the same. When driving each driving stage, all the sensing electrodes of the electromagnetic touch screen collect signals at the same time, and after a sensing cycle ends and all the driving electrodes complete a complete round of driving, all the collected sensing signals are combined with the driving signals of the driving electrodes, so that the coordinate calculation of the electromagnetic pen can be realized.

[0083] In combination Figure 5 It can be known that the electromagnetic touch driving device provided in the embodiment of the utility model is coupled to the 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, the plurality of first driving ends are used for respectively outputting first driving voltages to the other end of the plurality of first driving electrodes, wherein, any two first driving electrodes constitute a driving coil, and the current is generated in a part of the driving coils in each driving coil to generate an electromagnetic field, so that the position of the electromagnetic pen is sensed by sensing the change of the electromagnetic field caused by the electromagnetic pen on the electromagnetic touch screen, wherein, the electromagnetic touch driving device operates according to driving stages, and the current direction in each driving coil in which the current is generated is consistent by the first driving end in each driving stage.

[0084] In the embodiment of the application, the electromagnetic touch driving device outputs the first driving voltage to the plurality of first driving electrodes of the electromagnetic touch screen through the plurality of first driving ends, so that under the action of the first driving voltage, the current is generated in the driving coil formed by two first driving electrodes to generate an electromagnetic field. When the electromagnetic pen is placed in the area corresponding to the driving coil, the electromagnetic field in the area will change, so the position of the electromagnetic pen can be sensed by sensing the change of the electromagnetic field in the corresponding area. The electromagnetic touch driving device operates according to driving stages, and the current direction in each driving coil in which the current is generated is consistent by controlling the first driving voltage output by the first driving end in each driving stage, so that the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, so that the signal sensed by the electromagnetic touch screen in the same driving stage can be prevented from being reversed, and the accuracy of the position detection of the electromagnetic pen can be improved.

[0085] In the case that the first driving end is a plurality of first driving ends, refer to Figure 5, S0, S1, S2, S3,..., Sn represent the first driving source corresponding to the first driving electrode Tx0, the first driving electrode Tx1, the first driving electrode Tx2, the first driving electrode Tx3,..., the first driving electrode Txn respectively. As described above, each first driving end corresponds to a first driving electrode, but not necessarily each first driving source corresponds to a first driving electrode. The first driving source can be multiple, that is, each first driving source corresponds to a first driving electrode. But the first driving source can also be only two, or only one.

[0086] Figure 5 The case where each first driving source corresponds to a first driving electrode is shown. Figure 5 In the embodiment, each of the first driving electrodes Tx1, Tx2, Tx3,..., and Txn is coupled to a different first driving source S0, S1,..., Sn, wherein, in the driving stage 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,..., and Txn respectively provide a negative first driving voltage -Vs; in the driving stage 2, the first driving sources S0 and S1 coupled to the first driving electrodes Tx0 and Tx1 respectively provide a positive first driving voltage Vs, and the first driving sources S2,..., Sn coupled to the first driving electrodes Tx2, Tx3,..., and Txn respectively provide a negative first driving voltage -Vs,..., in the driving stage n-1, the first driving sources S0, S1,..., Sn-2 coupled to the first driving electrodes Tx0, Tx1,..., Txn-2 respectively provide a positive first driving voltage Vs, and the first driving sources Sn-1 and Sn coupled to the first driving electrodes Txn-1 and Txn respectively provide a negative first driving voltage -Vs; in the driving stage n, the first driving sources S0, S1,..., Sn-1 coupled to the first driving electrodes Tx0, Tx1,..., Txn-1 respectively provide a positive first driving voltage Vs, and the first driving source Sn coupled to the first driving electrode Txn provides a negative first driving voltage -Vs.

[0087] For the case where there are only two first driving sources, as shown in Figure 6 There are two first driving sources, which are a first positive driving source S+ and a first negative driving source S- respectively, and they 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.

[0088] The electromagnetic touch driving device drives in sequence of driving stage 1, driving stage 2, driving stage n-1, driving stage n, and simultaneously drives the first driving electrodes Tx0, Tx1, Tx2, Tx3, …, and Txn in each driving stage. The working conditions of the first positive driving source S+ and the first negative driving source S- in each driving stage are as follows:

[0089] For the first driving stage, the first positive driving source S+ outputs the positive first driving voltage Vs to the first driving electrode Tx0 through the first driving end qd0, and the first negative driving source S- outputs the negative first driving voltage -Vs to the remaining first driving electrodes Tx1-Txn through the first driving ends qd1-qdn; ...

[0091] For the i-th driving stage, the first positive driving source S+ outputs the positive first driving voltage Vs to the first i driving electrodes Tx0-Tx(i-1) through the first driving ends qd0-qd(i-1), and the first negative driving source S- outputs the negative first driving voltage -Vs to the remaining first driving electrodes Txi-Txn through the first driving ends qdi-qdn, i is a positive integer, 1≤i≤n; ...

[0093] For the n-th driving stage, the first positive driving source S+ outputs the positive first driving voltage Vs to the first n driving electrodes Tx0-Tx(n-1) through the first driving ends qd0-qd(n-1), and the first negative driving source S- outputs the negative first driving voltage -Vs to the last first driving electrode Txn through the first driving end qdn.

[0094] After the n-th driving stage ends, a sensing period ends.

[0095] In this embodiment, in the i-th driving stage, the first positive driving source S+ in the plurality of first driving sources outputs the equal positive first driving voltage Vs to the first i driving ends, so as to output the positive first driving voltage Vs to the first i driving electrodes arranged along the first direction; the first negative driving source S- in the plurality of first driving sources outputs the equal negative first driving voltage -Vs to the remaining first driving ends, so as to output the negative first driving voltage -Vs to the remaining first driving electrodes arranged along the first direction; so that in each driving stage, the current directions in the current of each driving coil are consistent, and thus the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent, thereby avoiding the signal sensed by the electromagnetic touch screen being reversed in the same driving stage, and improving the accuracy of the electromagnetic pen position detection.

[0096] In addition, for the i-th driving stage, the first i first driving electrodes arranged in the first direction share a first positive driving source S+, and the remaining n+1-i first driving electrodes arranged in the first direction share a first negative driving source S-, so that the electromagnetic touch driving device only needs to configure two first driving sources to meet the driving requirements, and the number of driving sources can be saved.

[0097] The case where the first driving source is only one is not shown. In this case, the first driving source is coupled with an inverter. The 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 of the case where the first driving source is only one can refer to the working process of the case where the first driving source is two described above in conjunction with Figure 6 , and thus is not described in detail.

[0098] It can be understood that the first driving source for providing the first driving voltage for each first driving electrode of the electromagnetic touch screen is arranged in the electromagnetic touch driving device.

[0099] Referring to Figure 7 , Figure 7 is a schematic view of the structure 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 Buffer. The driving waveform required, such as a sine wave, a square wave, a triangular wave, etc., is first generated by the digital-to-analog converter DAC, then the driving waveform is amplified to the required voltage amplitude by the operational amplifier Gain, then the interference signal is filtered out through the low-pass filter LPF, and finally the driving capacity is enhanced through the buffer amplifier Buffer to output the driving voltage. Since the first driving source needs to simultaneously provide the first driving voltage for multiple first driving electrodes, the structure shown in Figure 7 is adopted, which can have better driving capacity, and ensure that the waveform, frequency, phase, and amplitude of the first driving voltage simultaneously obtained by the multiple first driving electrodes are highly consistent, and the driving voltage is not distorted.

[0100] Referring to Figure 8 , Figure 8 is a schematic view of the driving effect of the electromagnetic touch driving device provided by another embodiment of the utility model on the electromagnetic touch screen. It mainly differs from Figure 5 in that, Figure 5 the first driving voltage in Figure 8 is only one positive and one negative, each first driving electrode in

[0101] applies a first driving voltage that is different from each other and in descending order. Figure 8As shown, 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, respectively. One end of the plurality of first driving electrodes is coupled to each other, such as the upper ends of first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3,..., and first driving electrode Txn. The plurality of first driving electrodes of the electromagnetic touch screen are connected in a comb structure. The electromagnetic touch driving device includes a plurality of first driving ends for outputting first driving voltages, respectively. The electromagnetic touch driving device further includes a plurality of first driving sources coupled to the plurality of first driving ends, respectively, such as first driving source S0, first driving source S1, first driving source S2, first driving source S3,..., and first driving source Sn (and Figure 5 Unlike the scheme of the first embodiment, each first driving source needs to be provided for each driving electrode in this embodiment, and the first driving sources are not reused. Figure 1 Figure 3 In the electromagnetic touch screen, the plurality of first driving electrodes are arranged along the 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 in horizontal direction from left to right in

[0102] In each driving stage of the present embodiment, the first driving voltages output by the first driving sources to the first driving electrodes are arranged in descending order along the first direction, that is, by controlling the size 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, such as​Figure 8 As shown, all are clockwise direction, thereby being able to avoid the voltage signal received when the electromagnetic pen is sensed at different positions of the electromagnetic touch screen being reversed.

[0103] It can be understood that the first driving source for providing the first driving voltage for each first driving electrode of the electromagnetic touch screen is arranged in the electromagnetic touch driving device, and therefore in order to realize the driving effect shown in the figure, the electromagnetic touch driving device provided in one embodiment of the utility model adopts the structure shown in the figure. Figure 8 The electromagnetic touch driving device provided in one embodiment of the utility model adopts the structure shown in the figure, and the electromagnetic touch driving device includes a plurality of first driving ends qd0, qd1, qd2, qd3,..., qdn, and further includes a plurality of corresponding first driving sources S0, S1, S2, S3,..., Sn. Figure 9 The electromagnetic touch driving device sequentially drives in the order of driving stage 1, driving stage 2,..., driving stage i,..., driving stage n, simultaneously drives the first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn in each driving stage, and the duration of each driving stage is the same. Specifically, in each driving stage, the first driving source S0 in the electromagnetic touch driving device provides the first driving voltage Vs0 to the lower end of the first driving electrode Tx0 in the electromagnetic touch screen through the first driving end qd0; the first driving source S1 in the electromagnetic touch driving device provides the first driving voltage Vs1 to the lower end of the first driving electrode Tx1 in the electromagnetic touch screen through the first driving end qd1; the first driving source S2 in the electromagnetic touch driving device provides the first driving voltage Vs2 to the lower end of the first driving electrode Tx2 in the electromagnetic touch screen through the first driving end qd2;..., the first driving source Si in the electromagnetic touch driving device provides the first driving voltage Vsi to the lower end of the first driving electrode Txi in the electromagnetic touch screen through the first driving end qdi;..., and the first driving source Sn in the electromagnetic touch driving device provides the first driving voltage Vsn to the lower end of the first driving electrode Txn in the electromagnetic touch screen through the first driving end qdn.

[0104] In the driving stage 1: for the difference value of the first driving voltage obtained for any two adjacent first driving electrodes, the difference value of the first driving voltage Vs0 and the first driving voltage Vs1 is the largest.

[0105] In the driving stage 2: for the difference value of the first driving voltage obtained for any two adjacent first driving electrodes, the difference value of the first driving voltage Vs1 and the first driving voltage Vs2 is the largest. ...

[0107] In the driving stage i: for the difference of the first driving voltage obtained by any two adjacent first driving electrodes, the difference between the first driving voltage Vsi-1 and the first driving voltage Vsi is the largest; ...

[0109] In the driving stage n: for the difference of the first driving voltage obtained by any two adjacent first driving electrodes, the difference between the first driving voltage Vsn-1 and the first driving voltage Vsn is the largest.

[0110] Therefore, in the embodiment, the plurality of first driving voltages decrease in turn along the arrangement direction of the plurality of first driving electrodes, in the i-th driving stage, that is, in the 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 larger than the difference between any other first driving voltage and the next first driving voltage, therefore, in the driving stage 1, that is, in the first driving stage, the electromagnetic field intensity of the region between the first driving electrode Tx0 and the first driving electrode Tx1 is the largest; in the driving stage 2, that is, in the second driving stage, the electromagnetic field intensity of the region between the first driving electrode Tx1 and the first driving electrode Tx2 is the largest; in the driving stage i, that is, in the i-th driving stage, the electromagnetic field intensity of the region between the first driving electrode Txi-1 and the first driving electrode Txi is the largest; in the n-th driving stage, that is, in the n-th driving stage, the electromagnetic field intensity of the region between the first driving electrode Txn-1 and the first driving electrode Txn is the largest, that is, the electromagnetic field intensity of a corresponding region is the largest in each driving stage, and the corresponding region shifts along the first direction with the driving stage jumping, so that the position of the electromagnetic pen can be determined by sensing the change of the electromagnetic field at different times. The electromagnetic touch screen includes n+1 first driving electrodes, and one complete driving needs n driving times, each corresponding to one driving stage in the above; when driving is performed in each driving stage, all the sensing electrodes of the electromagnetic touch screen collect signals at the same time, and after one complete driving of all the driving electrodes is completed, all the sensing signals collected are combined with the driving signals of the driving electrodes, so that the coordinate calculation of the electromagnetic pen can be realized.

[0111] Referring to Figure 10 , Figure 10 is a driving effect schematic diagram of the electromagnetic touch driving device on the electromagnetic touch screen. The electromagnetic touch screen refers to Figure 1 or Figure 3As shown, the electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, for example, first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn arranged along a horizontal direction in sequence, respectively, 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, 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 in a comb 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, for example, second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn arranged along a vertical direction in sequence, respectively, one end of the plurality of second driving electrodes is coupled to each 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 plurality of second driving electrodes of the electromagnetic touch screen are connected in a comb structure; the electromagnetic touch driving device includes a plurality of first driving ends for respectively outputting first driving voltages, and a plurality of second driving ends for respectively outputting second driving voltages, the electromagnetic touch driving device sequentially drives in the order of driving stage 1A and driving stage 1B, and simultaneously drives the plurality of first driving electrodes and the plurality of second driving electrodes in each driving stage, specifically:

[0112] In the driving stage 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-1 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 Vs0≥Vs1≥Vs2≥...≥Vsn-2≥Vsn-1≥Vsn;

[0113] 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.

[0114] 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.

[0115] The above has been referenced Figure 9 Explained Figure 8 Driven efficiency. Figure 9 Also applicable Figure 10 The driving structure. In an electromagnetic touchscreen, multiple first driving electrodes are arranged along a first direction, for example... 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 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 the second direction, for example... Figure 1 or Figure 3The second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn are sequentially arranged in a vertical direction from top to bottom, the second driving electrode Rx0 is the first second driving electrode arranged in the second direction,..., and the second driving electrode Rxn is the n+1th second driving electrode arranged in the second direction. The first direction can be perpendicular to the second direction.

[0116] In the embodiment, the driving stages of the electromagnetic touch driving device for driving the electromagnetic touch screen include a first driving stage and a second driving stage; the first driving stage corresponds to the driving stage 1A, and the second driving stage corresponds to the driving stage 1B. In the first driving stage, the driving sources S0, S1, S2, S3,..., and Sn are used as first driving sources, the ith first driving source outputs an ith first driving voltage to an ith first driving end, which is greater than or equal to an (i+1)th first driving voltage output by an (i+1)th first driving source to an (i+1)th first driving end, so that the first driving voltage output by the ith first driving source to an ith first driving electrode arranged in the first direction is greater than or equal to the first driving voltage output by the (i+1)th first driving source to an (i+1)th first driving electrode arranged in the first direction, where 1≤i≤n, i and n are positive integers, and n+1 is the number of the first driving electrodes; in the second driving stage, the driving sources S0, S1, S2, S3,..., and Sn are used as second driving sources, the ith second driving source outputs an ith second driving voltage to an ith second driving end, which is greater than or equal to an (i+1)th second driving voltage output by an (i+1)th second driving source to an (i+1)th second driving end, so that the second driving voltage output by the ith second driving source to an ith second driving electrode arranged in the second direction is greater than or equal to the second driving voltage output by the (i+1)th second driving source to an (i+1)th second driving electrode arranged in the second direction, where 1≤i≤n, i and n are positive integers, and n+1 is the number of the second driving electrodes. By controlling the sizes of the first driving voltage in the driving stage 1A and the second driving voltage in the driving stage 1B, the current directions in the driving coils formed by any two first driving electrodes are consistent, for example, both are clockwise, in the first driving stage and the second driving stage, so that the signal received when the electromagnetic pen is sensed at different positions of the electromagnetic touch screen can be avoided from being reversed.

[0117] 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.

[0118] Furthermore, based on the above Figure 10 Based on the embodiments, in one possible implementation, in the first driving stage, the first driving voltages output by a plurality of first driving sources to n+1 first driving electrodes arranged along a first direction are arranged in descending order of arithmetic progression; in the second driving stage, the second driving voltages output by a plurality of second driving sources to n+1 second driving electrodes arranged along a 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.

[0119] 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.

[0120] 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.

[0121] Reference is made to Figure 11 , Figure 11 is a driving effect schematic diagram of the electromagnetic touch driving device provided in an embodiment of the utility model for driving the electromagnetic touch screen. The electromagnetic touch screen comprises a plurality of first driving electrodes arranged along a first direction, for example, 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 electrode 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 structure; the electromagnetic touch driving device drives in sequence according to driving stage 1, driving stage 2, …, driving stage n-1 and driving stage n, at least two first driving electrodes among first driving electrode Tx0, first driving electrode Tx1, first driving electrode Tx2, first driving electrode Tx3, … and first driving electrode Txn are driven at the same time in each driving stage, specifically:

[0122] Driving stage 1 comprises sub-stage 1A and sub-stage 1B, in sub-stage 1A, the anode and cathode of the charging capacitor filled with positive pressure are connected to the lower ends of first driving electrode Tx0 and first driving electrode Tx1 respectively, and the lower ends of other first driving electrodes are grounded or suspended; in sub-stage 1B, the anode and cathode of the charging capacitor filled with negative pressure are connected to the lower ends of first driving electrode Tx0 and first driving electrode Tx1 respectively, and the lower ends of other first driving electrodes are grounded or suspended. The charging capacitor filled with positive pressure in sub-stage 1A and the charging capacitor filled with negative pressure in sub-stage 1B are not the same charging capacitor, because sub-stage 1A and 1B are continuous, the same charging capacitor cannot jump from positive pressure to negative pressure, therefore two different charging capacitors are adopted. In sub-stage 1A, the charging capacitor filled with positive pressure works, and the other charging capacitor charges so as to be filled with negative pressure. In sub-stage 1B, the charging capacitor filled with negative pressure works, and the other charging capacitor charges so as to be filled with positive pressure. The specific process is described in detail below.

[0123] 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.

[0124] The 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 electrode Tx1 and the first driving electrode Tx2, respectively, and 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 electrode Tx1 and the first driving electrode Tx2, respectively, and the lower ends of the other first driving electrodes are grounded or left floating. ...

[0126] 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.

[0127] 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.

[0128] 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.

[0129] In order to achieve electromagnetic touch screen Figure 11 The driving effect shown is achieved by using an electromagnetic touch driving device provided in one embodiment of this utility model. Figure 12The charging capacitor used by 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, and the electromagnetic touch driving device further 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, a first switch swAn and a second switch swBn corresponding to the first driving electrode Txn.

[0130] Specifically: the anode of the first charging capacitor CP is connected to the first selection end of the first single-pole double-throw switch sw1 and the first selection end of the third single-pole double-throw switch sw3, and the cathode of the first charging capacitor CP is connected to the first selection end of the second single-pole double-throw switch sw2 and the first selection end of the fourth single-pole double-throw switch sw4; the anode of the second charging capacitor CN is connected to the second selection end of the first single-pole double-throw switch sw1 and the second selection end of the fourth single-pole double-throw switch sw4, and the cathode of the second charging capacitor CN is connected to the second selection end of the second single-pole double-throw switch sw2 and the second selection end of the third single-pole double-throw switch sw3, the common end of the third single-pole double-throw switch sw3 is connected to the reference voltage Vref, and the common end of the fourth single-pole double-throw switch sw4 is grounded; one end of the first switch swA0 is used to be connected to the first driving electrode Tx0, and the other end of the first switch swA0 is connected to the common end of the first single-pole double-throw switch sw1;..., one end of the first switch swAn-1 is used to be connected to the first driving electrode Txn-1, and the other end of the first switch swAn-1 is connected to the common end of the first single-pole double-throw switch sw1; one end of the first switch swAn is used to be connected to the first driving electrode Txn, and the other end of the first switch swAn is connected to the common end of the first single-pole double-throw switch sw1; one end of the second switch swB0 is used to be connected to the first driving electrode Tx0, and the other end of the first switch swB0 is connected to the common end of the second single-pole double-throw switch sw2;..., one end of the second switch swBn-1 is used to be connected to the first driving electrode Txn-1, and the other end of the second switch swBn-1 is connected to the common end of the second single-pole double-throw switch sw2; one end of the second switch swBn is used to be connected to the first driving electrode Txn, and the other end of the second switch swBn is connected to the common end of the second single-pole double-throw switch sw2.

[0131] Figure 11 In each driving stage, the duration of each driving stage is the same, and each driving stage includes a first sub-stage and a second sub-stage; a plurality of first driving electrodes in the electromagnetic touch screen are arranged along a first direction, for example Figure 1 Figure 3The first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn are sequentially arranged in the horizontal direction from left to right, the first driving electrode Tx0 is the first first driving electrode arranged in the first direction,..., and the first driving electrode Txn is the (n+1)th first driving electrode arranged in the first direction. Therefore, in this embodiment: in the first sub-stage of the ith driving stage, that is, in the 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 ith first driving terminal, so as to couple the anode of the first charging capacitor CP to the ith first driving electrode arranged in the first direction, that is, 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, so as to couple the cathode of the first charging capacitor CP to the (i+1)th first driving electrode arranged in the first direction, that is, the first driving electrode 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, that is, the first charging capacitor CP is driven at this time, and the second charging capacitor CN is charged; in the second sub-stage of the ith 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 ith first driving terminal, so as to couple the anode of the second charging capacitor CN to the ith first driving electrode arranged in the first direction, that is, the first driving electrode Txi-1; the second single-pole double-throw switch sw2 and the second switch swBi couple the cathode of the second charging capacitor CN to the (i+1)th first driving terminal, so as to couple the cathode of the second charging capacitor CN to the (i+1)th first driving electrode arranged in the first direction, that is, 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; and the fourth single-pole double-throw switch sw4 grounds the cathode of the first charging capacitor CP, that is, the second charging capacitor CN is driven at this time, and the first charging capacitor CP is charged; wherein 1≤i≤n, i and n are positive integers, and n+1 is the number of the first driving electrodes.

[0132] In combination Figure 11 , Figure 12As can be known from the above driving control processes of the various steps in the embodiment, when the electromagnetic touch driving apparatus in the embodiment drives the electromagnetic touch screen, in one driving stage, the two ends of the charging capacitor are coupled to two first driving ends in the plurality of first driving ends, for example, in the 1st 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 2nd 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 ith 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 nth 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 ith driving stage, the anode and the cathode of the charging capacitor are coupled to the ith and the (i+1)th first driving ends respectively, so as to be coupled to the ith and the (i+1)th first driving electrodes arranged along the first direction, i.e., the first driving electrode Txi-1 and the first driving electrode Txi, i being a positive integer. And in the embodiment, the charging capacitor 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; in the first sub-stage of the ith driving stage, i.e., in the sub-stage iA, the anode and the cathode of the first charging capacitor CP are coupled to the ith and the (i+1)th first driving ends respectively; in the second sub-stage of the ith driving stage, i.e., in the sub-stage iB, the anode and the cathode of the second charging capacitor CN are coupled to the ith and the (i+1)th first driving ends respectively.

[0133] In one complete driving stage of the embodiment, by sequentially connecting the first charging capacitor CP and the second charging capacitor CN, the connection switching of the first charging capacitor CP and the second charging capacitor CN makes the magnetic field generated in the region between the two first driving electrodes to be driven change alternately, when the electromagnetic pen is placed in the region, the electromagnetic pen induces an alternating electric field, that is, an induced voltage signal; and driving is sequentially performed 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 different two first driving electrodes, when driving in each driving stage, all the sensing electrodes of the electromagnetic touch screen simultaneously collect signals, after completing a round of complete driving of all the driving electrodes, all the sensing signals collected 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 directions in the driving coils generating current are consistent, therefore, in each driving stage, the change of the electromagnetic field sensed at different positions of the electromagnetic touch screen is consistent, thereby it can be avoided that the signals sensed at different positions of the electromagnetic touch screen in the same driving stage are reversed.

[0134] With reference to Figure 13 , Figure 13 is an embodiment provided by the electromagnetic touch driving device based on Figure 11 of the utility model, the driving effect schematic diagram of the electromagnetic touch screen of the electromagnetic touch driving device is shown, the charging capacitors full of negative pressure connected in the sub stage B of the corresponding each driving stage of Figure 11 , namely sub stage 1B, sub stage 2B,..., sub stage nB, are removed, and the corresponding first driving electrode is changed to ground, that is, each sub stage of Figure 13 can be obtained.In the embodiment, the electromagnetic touch driving device sequentially drives in the order of driving stage 1, driving stage 2,..., driving stage n-1, driving stage n, at least two first driving electrodes among 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 in each driving stage, specifically:

[0135] The driving stage 1 includes a sub-stage 1A and a sub-stage 1B. In the sub-stage 1A, the anode and the cathode of the charged capacitor filled with positive pressure are connected to the lower ends of the first driving electrodes Tx0 and Tx1 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 1B, the lower ends of all the first driving electrodes are grounded or suspended. Therefore, in the sub-stage 1A, the driving coil composed of the first driving electrodes Tx0 and Tx1 is connected across the charged capacitor, the charged capacitor discharges to generate a loop current on the driving coil, and further generates a magnetic field in the region between the first driving electrodes Tx0 and Tx1. The switching between the sub-stage 1A and the sub-stage 1B causes the magnetic field generated in the region between the first driving electrodes Tx0 and Tx1 to change, and when the electromagnetic pen is placed in the region, the electromagnetic pen induces an alternating electric field, i.e. an induced voltage signal. Since the other first driving electrodes are not connected to the discharge loop of the charged capacitor, no loop current is generated, and thus no magnetic field is generated.

[0136] The driving stage 2 includes a sub-stage 2A and a sub-stage 2B. In the sub-stage 2A, the anode and the cathode of the charged capacitor filled with positive pressure are connected to the lower ends of the first driving electrodes Tx1 and Tx2 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 2B, the lower ends of all the first driving electrodes are grounded. ...

[0138] The driving stage n includes a sub-stage nA and a sub-stage nB. In the sub-stage nA, the anode and the cathode of the charged capacitor filled with positive pressure are connected to the lower ends of the first driving electrodes Txn-1 and Txn respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage nB, the lower ends of all the first driving electrodes are grounded.

[0139] 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.

[0140] Reference Figure 14 , Figure 14 This utility model is based on Figure 11 A schematic diagram illustrating the driving effect of the electromagnetic touch drive device on the electromagnetic touch screen, obtained by modifying the previous embodiment. Figure 11 Each driving stage in the process drives two adjacent first driving electrodes, while... Figure 14 In each driving stage, the charging capacitor drives two separate 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:

[0141] The driving stage 1 includes a sub-stage 1A and a sub-stage 1B. In the sub-stage 1A, the anode and the cathode of the 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, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 1B, the anode and the cathode of the 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, and the lower ends of the other first driving electrodes are grounded or suspended. Thus, in the driving stage 1, the driving coil composed of the first driving electrode Tx0 and the first driving electrode Txm-1 is connected to the two ends of the charging capacitor, the charging capacitor discharges to generate a loop current on the driving coil, and further generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Txm-1. The switching of the sub-stage 1A and the sub-stage 1B makes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Txm-1 change alternately. When the electromagnetic pen is placed in the region, the electromagnetic pen induces an alternating electric field, i.e., an induced voltage signal. Since the other first driving electrodes are not connected to the discharge loop of the charging capacitor, no loop current is generated, and thus no magnetic field is generated.

[0142] The driving stage 2 includes a sub-stage 2A and a sub-stage 2B. In the sub-stage 2A, the anode and the cathode of the charging capacitor filled with positive voltage are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Txm respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 2B, the anode and the cathode of the charging capacitor filled with negative voltage are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Txm respectively, and the lower ends of the other first driving electrodes are grounded or suspended. Wherein, m is a positive integer greater than or equal to 2. ...

[0144] The driving stage i includes a sub-stage iA and a sub-stage iB. In the sub-stage iA, the anode and the 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, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage iB, the anode and the 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, and the lower ends of the other first driving electrodes are grounded or suspended. ...

[0146] That is, in the embodiment, the plurality of first driving electrodes in the electromagnetic touch screen are arranged along the first direction, for example Figure 1 Or Figure 3The first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn are sequentially arranged in a horizontal direction from left to right; the duration of each driving stage is the same, in the i-th driving stage, the anode and the cathode of the charging capacitor are coupled to the i-th first driving end and the i+m-th first driving end respectively, so as to be coupled to the i-th and the i+m-th first driving electrodes arranged in the first direction, that is, the first driving electrode Tx i-1 and the first driving electrode Tx i-1+m, m is a positive integer greater than or equal to 2. When driving each driving stage, all the sensing electrodes of the electromagnetic touch screen simultaneously collect signals, and after completing a round of complete driving of all the driving electrodes, all 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; by controlling the connection of the charging capacitor in each driving stage, the current directions in the driving coils generating current are consistent in each driving stage, so that 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.

[0147] With reference to Figure 15 , Figure 15 is an embodiment of the utility model based on Figure 14 The driving effect diagram of the electromagnetic touch driving device provided by the embodiment is shown in the figure, in each driving stage of Figure 14 , the charging capacitor drives two first driving electrodes which are separated and have a fixed interval, and in each driving stage of Figure 15 , the charging capacitor drives two first driving electrodes which are separated and have a random interval. In the embodiment, the electromagnetic touch driving device sequentially drives in the order of driving stage 1, driving stage 2,..., driving stage k,..., and drives at least two first driving electrodes among the first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn in each driving stage, specifically:

[0148] The driving stage 1 includes a sub-stage 1A and a sub-stage 1B. In the sub-stage 1A, the anode and the cathode of the charged capacitor filled with positive voltage are connected to the lower ends of the first driving electrodes Tx0 and Tx0 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 1B, the anode and the cathode of the charged capacitor filled with negative voltage are connected to the lower ends of the first driving electrodes Tx0 and Tx0 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. Thus, in the driving stage 1, the driving coil composed of the first driving electrodes Tx0 and Tx0 is connected to the two ends of the charged capacitor, and the charged capacitor discharges to generate a loop current on the driving coil, and further generates a magnetic field in the region between the first driving electrodes Tx0 and Tx0. The switching of the sub-stage 1A and the sub-stage 1B makes the magnetic field generated in the region between the first driving electrodes Tx0 and Tx0 change alternately, and when the electromagnetic pen is placed in the region, the electromagnetic pen induces an alternating electric field, i.e. an induced voltage signal. Since the other first driving electrodes are not connected to the discharge loop of the charged capacitor, no loop current is generated, and thus no magnetic field is generated.

[0149] The driving stage 2 includes a sub-stage 2A and a sub-stage 2B. In the sub-stage 2A, the anode and the cathode of the charged capacitor filled with positive voltage are connected to the lower ends of the first driving electrodes Txi-1 and Txj-1 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage 2B, the anode and the cathode of the charged capacitor filled with negative voltage are connected to the lower ends of the first driving electrodes Txi-1 and Txj-1 respectively, and the lower ends of the other first driving electrodes are grounded or suspended.

[0150] The driving stage k includes a sub-stage kA and a sub-stage kB. In the sub-stage kA, the anode and the cathode of the charged capacitor filled with positive voltage are connected to the lower ends of the first driving electrodes Txp-1 and Txp+q-1 respectively, and the lower ends of the other first driving electrodes are grounded or suspended. In the sub-stage kB, the anode and the cathode of the charged capacitor filled with negative voltage are connected to the lower ends of the first driving electrodes Txp-1 and Txp+q-1 respectively, and the lower ends of the other first driving electrodes are grounded or suspended.

[0151] Furthermore, each first driving electrode is coupled with the charged capacitor in at least one driving stage. In the embodiment, by controlling the connection of the charged capacitor in each driving stage, the current direction in the driving coil generating current is consistent in each driving stage, and thus the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, so that the signal sensed by the electromagnetic touch screen in the same driving stage can be prevented from being reversed.

[0152] In some other embodiments, the union of the coverage ranges of the drive coils formed by the two first drive electrodes driven by the charging capacitor from the first drive stage to the last drive stage covers all the first drive electrodes, i.e., the first drive electrode Tx0, the first drive electrode Tx1, the first drive electrode Tx2, the first drive electrode Tx3,..., and the first drive electrode Txn. That is, in an embodiment, the plurality of first drive electrodes in the electromagnetic touch screen are arranged along a first direction, for example Figure 1 or Figure 3 the first drive electrode Tx0, the first drive electrode Tx1, the first drive electrode Tx2, the first drive electrode Tx3,..., and the first drive electrode Txn are sequentially arranged along a horizontal direction from left to right; the duration of each drive stage is the same, in the kth drive stage, the anode and the cathode of the charging capacitor are coupled to the first drive terminals leading to the pth and the p+qth first drive electrodes arranged along the first direction respectively, k is a positive integer, p is a random positive integer and is different in each drive stage, q is a random positive integer and is different in each drive stage, the pth to the p+qth first drive electrodes constitute the coverage range of the kth drive stage, and the union of the coverage ranges of the various drive stages covers each first drive electrode. When driving each drive stage, all the sensing electrodes of the electromagnetic touch screen simultaneously collect signals, and after completing a complete round of driving of all the drive electrodes, the collected sensing signals are combined with the driving signals of the drive electrodes, i.e., the coordinate calculation of the electromagnetic pen can be realized; by controlling the connection of the charging capacitor in each drive stage, the current directions in the drive coils generating current are consistent in each drive stage, so the changes of the electromagnetic field sensed by the electromagnetic touch screen are consistent in each drive stage, thereby avoiding the inversion of the signals sensed by the electromagnetic touch screen in the same drive stage.

[0153] Referring to Figure 16 , Figure 16 is an embodiment provided by the electromagnetic touch driving device based on Figure 11 the driving effect diagram of the electromagnetic touch screen, Figure 11 in which the drive stage of each drive coil is divided into a sub-stage A and a sub-stage B, and the first charging capacitor CP and the second charging capacitor CN are connected respectively; and in Figure 16In this embodiment, the electromagnetic touch driving device is driven in sequence according to 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:

[0154] Driving stage 1 includes sub-stage 1A, sub-stage 1B,..., sub-stage 1M, in sub-stage 1A, the anode and cathode of the fully charged charging capacitor VA are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Tx1 respectively; in sub-stage 1B, the anode and cathode of the fully charged charging capacitor VB are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Tx1 respectively;...; in sub-stage 1M, the anode and cathode of the fully charged charging capacitor VM are connected to the lower ends of the first driving electrode Tx0 and the first driving electrode Tx1 respectively; the lower ends of the other first driving electrodes are grounded or suspended; therefore, in driving stage 1, the driving coil composed of the first driving electrode Tx0 and the first driving electrode Tx1 is connected across the charging capacitor, the charging capacitor discharges to generate a loop current on the driving coil, and further generates a magnetic field in the region between the first driving electrode Tx0 and the first driving electrode Tx1; the switching of sub-stage 1A, sub-stage 1B,..., sub-stage 1M causes the magnetic field generated in the region between the first driving electrode Tx0 and the first driving electrode Tx1 to alternate, when the electromagnetic pen is placed in the region, the electromagnetic pen induces an alternating electric field, i.e. 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 thus no magnetic field is generated;

[0155] Driving stage 2 includes sub-stage 2A, sub-stage 2B,..., sub-stage 2M, in sub-stage 2A, the anode and cathode of the fully charged charging capacitor VA are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Tx2 respectively; in sub-stage 1B, the anode and cathode of the fully charged charging capacitor VB are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Tx2 respectively;...; in sub-stage 1M, the anode and cathode of the fully charged charging capacitor VM are connected to the lower ends of the first driving electrode Tx1 and the first driving electrode Tx2 respectively; the lower ends of the other first driving electrodes are grounded or suspended;...

[0156] The driving stage n includes a sub-stage nA, a sub-stage nB,..., and a sub-stage nM. In the sub-stage nA, the anode and the cathode of the charged capacitor VA full of electricity are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn respectively; in the sub-stage nB, the anode and the cathode of the charged capacitor VB full of electricity are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn respectively;..., in the sub-stage nM, the anode and the cathode of the charged capacitor VM full of electricity are connected to the lower ends of the first driving electrode Txn-1 and the first driving electrode Txn respectively; the lower ends of other first driving electrodes are grounded or suspended.

[0157] Therefore, in the embodiment, the electromagnetic touch screen includes n+1 first driving electrodes, and one complete driving needs to be driven n times, each time corresponding to one driving stage in the above, the duration of each driving stage is the same, each driving stage includes h sub-stages, the charging capacitor includes h charging capacitors with different charging capacities, and 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 the cathode of the i-th charging capacitor of the h charging capacitors are coupled to the i-th first driving end and the i+1 first driving end respectively, so as to be coupled to the i-th and the i+1 first driving electrodes arranged along the first direction, i is a positive integer less than or equal to h; when each step is driven, all the sensing electrodes of the electromagnetic touch screen simultaneously collect signals, and after one complete driving of all the driving electrodes is completed, all the sensing signals collected are combined with the driving signals of the driving electrodes, so that the coordinate calculation of the electromagnetic pen can be realized; by controlling the connection of the charging capacitors in each driving stage, the current directions in the driving coils generating the current are consistent in each driving stage, so that the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby avoiding that the signals sensed by the electromagnetic touch screen are reversed in the same driving stage.

[0158] Referring to Figure 17 , Figure 17 is a driving effect schematic diagram of the electromagnetic touch driving device on the electromagnetic touch screen. The electromagnetic touch screen refers to Figure 1 or Figure 3As shown, the electromagnetic touch screen includes a plurality of first driving electrodes arranged along a first direction, such as first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn arranged along a horizontal direction in sequence, respectively. One end of the plurality of first driving electrodes is coupled to each other, such as the upper ends of the first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn being coupled to each other, so that the plurality of first driving electrodes of the electromagnetic touch screen are connected in a comb structure. The plurality of first driving electrodes are arranged along the first direction, such as the first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn being arranged along the horizontal direction in sequence from left to right. 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+1th first driving electrode arranged along the first direction. The electromagnetic touch screen further includes a plurality of second driving electrodes arranged along a second direction, such as second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn arranged along a vertical direction in sequence, respectively. One end of the plurality of second driving electrodes is coupled to each other, such as the left ends of the second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn being coupled to each other, so that the plurality of second driving electrodes of the electromagnetic touch screen are connected in a comb structure. The plurality of second driving electrodes are arranged along the second direction, such as the second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn being arranged along the vertical direction in sequence from top to bottom. 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+1th second driving electrode arranged along the second direction.

[0159] The electromagnetic touch driving device drives in sequence according to the driving stage 1 and the driving stage 2, and connects the charging capacitor to the first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn in the driving stage 1, and connects the charging capacitor to the second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn in the driving stage 2. Specifically:

[0160] The driving stage 1 includes sub-stage 1A and sub-stage 1B. In the sub-stage 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 n+1 first driving electrodes in total, n+1 is even, the first driving electrode Txn-1 and the first driving electrode Txn constitute the (n+1) / 2 first driving electrode group, and a plurality of charging capacitors are connected to all the first driving electrode groups and driven at the same time. In the 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. A plurality of charging capacitors are connected to all the second driving electrode groups and driven at the same time.

[0161] The driving stage 2 includes sub-stage 2A and sub-stage 2B. In the sub-stage 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, and so on. When n is odd, that is, there are n+1 first driving electrodes in total, n+1 is even, the second driving electrode Rxn-1 and the second driving electrode Rxn constitute the (n+1) / 2 first driving electrode group, and a plurality of charging capacitors are connected to all the first driving electrode groups and driven at the same time. In the sub-stage 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. A plurality of charging capacitors are connected to all the second driving electrode groups and driven at the same time.

[0162] In addition, in the driving stage 1, the longitudinally arranged second driving electrodes Rx0, Rx1, Rx2, Rx3,..., and Rxn are multiplexed as sensing electrodes simultaneously, and the sensing electrodes collect sensing signals to obtain coordinate information in one dimension; in the driving stage 2, the transversely arranged first driving electrodes Tx0, Tx1, Tx2, Tx3,..., and Txn are multiplexed as sensing electrodes simultaneously, and the sensing electrodes collect sensing signals to obtain coordinate information in another dimension; finally, the two-dimensional coordinate information obtained in the driving stage 1 and the driving stage 2 is combined to calculate the coordinate position of the electromagnetic pen.

[0163] Therefore, in combination with Figure 17 In order to achieve the above driving effect on the electromagnetic touch screen, the electromagnetic touch driving device drives the electromagnetic touch screen according to the driving stage 1 and the 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, the driving stage 1 of the embodiment includes a first sub-stage 1A and a second sub-stage 1B. The electromagnetic touch driving device includes a plurality of first driving ends, which are used to output first driving voltages to a plurality of first driving electrodes respectively, the number of first driving ends is M, and M is an even number; the electromagnetic touch driving device further includes M / 2 charging capacitors, in the first sub-stage 1A of the driving stage 1, one end of the ith charging capacitor is coupled to the 2i-1th first driving end, and the other end of the ith charging capacitor is coupled to the 2i th first driving end, i is a positive integer less than or equal to M / 2; in the second sub-stage 1B of the driving stage 1, one end of the ith charging capacitor is coupled to the 2i th first driving end, and the other end of the ith charging capacitor is coupled to the 2i+1th first driving end, so that in the driving stage 1, the n+1 first driving electrodes of the electromagnetic touch screen are driven through the M first driving ends, where M is greater than or equal to n+1, that is, the number of first driving ends is not less than the number of first driving electrodes;

[0164] Similarly, the driving stage 2 of the embodiment includes a first sub-stage 2A and a second sub-stage 2B, the number of the second driving ends in the electromagnetic touch driving device is M, M is an even number, the electromagnetic touch driving device further 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 end, the other end of the i-th charging capacitor is coupled to the 2i-th second driving end, 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 end, the other end of the i-th charging capacitor is coupled to the 2i+1-th second driving end, so that in step 2, the n+1 second driving electrodes of the electromagnetic touch screen are driven through the M second driving ends, wherein M is greater than or equal to n+1, that is, the number of the second driving ends is not less than the number of the second driving electrodes.

[0165] The electromagnetic touch driving device realizes that the electromagnetic field is generated in the regions corresponding to all the first driving electrodes in the driving stage 1, and the electromagnetic field is generated in the regions corresponding to all the second driving electrodes in the driving stage 2 by adopting the driving mode of the embodiment, the sensing signals of the electromagnetic pen are collected by the induction electrodes in the driving stage 1 and the driving stage 2 respectively, finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of two dimensions obtained in the driving stage 1 and the driving stage 2, and the current directions in the driving coils generating the current are consistent in each driving stage by the access control of the charging capacitors in each driving stage, so that the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, thereby the signals sensed by the electromagnetic touch screen in the same driving stage can be avoided from being reversed.

[0166] Referring to Figure 18 , Figure 18 is an embodiment provided by the electromagnetic touch driving device for driving the electromagnetic touch screen based on Figure 17 the embodiment, Figure 17 In each driving stage of Figure 18 , the adjacent two driving electrodes are driven, and in each driving stage of , the two first driving electrodes separated by the charging capacitor are driven.

[0167] The driving stage 1 includes a sub-stage 1A and a sub-stage 1B. In the sub-stage 1A, the first driving electrode Tx0 and the first driving electrode Txr form a first first driving electrode group, the first driving electrode Tx2r and the first driving electrode Tx3r form a second first driving electrode group, the first driving electrode Tx2rk-2r and the first driving electrode Tx2rk-r form a kth first driving electrode group, and the subsequent is sequentially continued. A plurality of charging capacitors are respectively connected to all the first driving electrode groups and are simultaneously driven. In the sub-stage 1B, the first driving electrode Txr and the first driving electrode Tx2r form a first second driving electrode group, the first driving electrode Tx3r and the first driving electrode Tx4r form a second second driving electrode group, the first driving electrode Tx2rk-r and the first driving electrode Tx2rk form a kth second driving electrode group, and the subsequent is sequentially continued. A plurality of charging capacitors are respectively connected to all the second driving electrode groups and are simultaneously driven.

[0168] The driving stage 2 includes a sub-stage 2A and a sub-stage 2B. In the sub-stage 2A, the second driving electrode Rx0 and the second driving electrode Rxr form a first first driving electrode group, the second driving electrode Rx2r and the second driving electrode Rx3r form a second first driving electrode group, the second driving electrode Rx2rk-2r and the second driving electrode Rx2rk-r form a kth first driving electrode group, and the subsequent is sequentially continued. A plurality of charging capacitors are respectively connected to all the first driving electrode groups and are simultaneously driven. In the sub-stage 2B, the second driving electrode Rxr and the second driving electrode Rx2r form a first second driving electrode group, the second driving electrode Rx3r and the second driving electrode Rx4r form a second second driving electrode group, the second driving electrode Rx2rk-r and the second driving electrode Rx2rk form a kth second driving electrode group, and the subsequent is sequentially continued. A plurality of charging capacitors are respectively connected to all the second driving electrode groups and are simultaneously driven.

[0169] Therefore, in combination with Figure 18In order to achieve the above 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, the driving stage 1 of the embodiment includes a first sub-stage 1A and a second sub-stage 1B. The electromagnetic touch driving device includes a plurality of first driving ends for respectively outputting a first driving voltage to a plurality of first driving electrodes. The number of first driving ends is M, and M is an even number. The electromagnetic touch driving device further includes M / 2r charging capacitors. In the first sub-stage 1A of the driving stage 1, one end of the ith charging capacitor is coupled to the 2ri-2r+1 first driving end, and the other end of the ith charging capacitor is coupled to the 2ri-r+1 first driving end, where i is a positive integer less than or equal to M / 2r. In the second sub-stage 1B of the driving stage 1, one end of the ith charging capacitor is coupled to the 2ri-r+1 first driving end, and the other end of the ith charging capacitor is coupled to the 2ri+1 first driving end. Thus, in the driving stage 1, the n+1 first driving electrodes of the electromagnetic touch screen are driven by the M first driving ends, where M is greater than or equal to n+1, that is, the number of first driving ends is not less than the number of first driving electrodes.

[0170] Similarly, the driving stage 2 of the embodiment includes a first sub-stage 2A and a second sub-stage 2B. The number of second driving ends in the electromagnetic touch driving device is M, and M is an even number. The electromagnetic touch driving device further includes M / 2 charging capacitors. In the first sub-stage 2A of the driving stage 2, one end of the ith charging capacitor is coupled to the 2ri-2r+1 second driving end, and the other end of the ith charging capacitor is coupled to the 2ri-r+1 second driving end, 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 ith charging capacitor is coupled to the 2ri-r+1 second driving end, and the other end of the ith charging capacitor is coupled to the 2ri+1 second driving end. Thus, in the step 2, the n+1 second driving electrodes of the electromagnetic touch screen are driven by the M second driving ends, where M is greater than or equal to n+1, that is, the number of second driving ends is not less than the number of second driving electrodes.

[0171] The electromagnetic touch driving device realizes that electromagnetic fields are generated in the regions corresponding to all the first driving electrodes in the driving stage 1, and electromagnetic fields are generated in the regions corresponding to all the second driving electrodes in the driving stage 2 by adopting the driving mode of the embodiment, the inductive electrodes collect the inductive signals of the electromagnetic pen in the driving stage 1 and the driving stage 2 respectively, finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of two dimensions obtained in the driving stage 1 and the driving stage 2, and the current directions in the driving coils generating the current are consistent in each driving stage by controlling the access of the charging capacitors in each driving stage, therefore, the change conditions of the electromagnetic fields sensed by the electromagnetic touch screen are consistent in each driving stage, so that the signal sensed by the electromagnetic touch screen in the same driving stage can be prevented from being reversed.

[0172] With reference to Figure 19 , Figure 19 The electromagnetic touch driving device provided by the embodiment of the utility model based on Figure 17 or Figure 18 The driving effect schematic diagram of the electromagnetic touch screen of the electromagnetic touch driving device provided by the embodiment of the utility model, Figure 17 or Figure 18 Each driving stage in the utility model is driving fixed interval two driving electrodes, and in the utility model Figure 19 Each driving stage is that the charging capacitors drive random interval two first driving electrodes.

[0173] The driving stage 1 includes the sub stage 1A and the sub stage 1B, in the sub stage 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 subsequent in turn, wherein the interval between 0 and a, b and c, d and e is random, a plurality of charging capacitors are used to access all the first driving electrode groups and drive simultaneously; in the sub stage 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 subsequent in turn, wherein the interval between a and b, c and d, e and f is random, a plurality of charging capacitors are used to access all the second driving electrode groups and drive simultaneously;

[0174] The driving stage 2 includes a sub-stage 2A and a sub-stage 2B. In the sub-stage 2A, the second driving electrode Rx0 and the second driving electrode Rxa constitute a first first driving electrode group, the second driving electrode Rxb and the second driving electrode Rxc constitute a second first driving electrode group, the second driving electrode Rxd and the second driving electrode Rxe constitute a third first driving electrode group, and the subsequent is sequentially similar, wherein the interval between 0 and a, b and c, and d and e is random, a plurality of charging capacitors are used to access all the first driving electrode groups and drive at the same time; in the sub-stage 2B, the second driving electrode Rxa and the second driving electrode Rxb constitute a first second driving electrode group, the second driving electrode Rxc and the second driving electrode Rxd constitute a second second driving electrode group, the second driving electrode Rxe and the second driving electrode Rxf constitute a third second driving electrode group, and the subsequent is sequentially similar, wherein the interval between a and b, c and d, and e and f is random, a plurality of charging capacitors are used to access all the second driving electrode groups and drive at the same time.

[0175] Therefore, in combination with Figure 19 In order to achieve the above driving effect on the electromagnetic touch screen, the electromagnetic touch driving device drives the electromagnetic touch screen according to the driving stage 1 and the driving stage 2, and the duration of each driving stage is the same. The electromagnetic touch driving device includes a plurality of first driving ends for outputting first driving voltages to a plurality of first driving electrodes, respectively. The electromagnetic touch driving device also includes a plurality of charging capacitors. Each driving stage includes a first sub-stage and a second sub-stage, for example:

[0176] The driving stage 1 of the embodiment comprises 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 first driving ends, x first driving ends arranged in the front are selected from the first driving ends which have not been coupled by the previous i-1 charging capacitors, one end of the i-th charging capacitor is coupled to the first first driving end of the x first driving ends, and the other end of the i-th charging capacitor is coupled to the last first driving end of the x first driving ends. In the second sub-stage 1B of the driving stage 1, for the i-th charging capacitor, according to the arrangement order of the first driving ends, y first driving ends arranged in the front are selected from the first driving ends which have not been coupled by the previous i-1 charging capacitors and have not been coupled in the first sub-stage, one end of the i-th charging capacitor is coupled to the first first driving end of the y first driving ends, and the other end of the i-th charging capacitor is coupled to the last first driving end of the y first driving ends. The value of the number x of the first driving ends corresponding to different charging capacitors in the sub-stage 1A is different, and the value of the number y of the first driving ends corresponding to different charging capacitors in the sub-stage 1B is different. Thus, in the driving stage 1, the plurality of first driving ends are used to drive the plurality of first driving electrodes of the electromagnetic touch screen, and the number of the first driving ends is not less than the number of the first driving electrodes.

[0177] The driving stage 2 of the embodiment corresponds to a driving stage comprising a first sub-stage 2A and a second sub-stage 2B. In the first sub-stage 2A of the driving stage 2, for the i-th charging capacitor, according to the arrangement order of the second driving ends, x second driving ends arranged in the front are selected from the second driving ends which have not been coupled by the previous i-1 charging capacitors, one end of the i-th charging capacitor is coupled to the first second driving end of the x second driving ends, and the other end of the i-th charging capacitor is coupled to the last second driving end of the x second driving ends. In the second sub-stage 2B of the driving stage 2, for the i-th charging capacitor, according to the arrangement order of the second driving ends, y second driving ends arranged in the front are selected from the second driving ends which have not been coupled by the previous i-1 charging capacitors and have not been coupled in the first sub-stage, one end of the i-th charging capacitor is coupled to the first second driving end of the y second driving ends, and the other end of the i-th charging capacitor is coupled to the last second driving end of the y second driving ends. The value of the number x of the second driving ends corresponding to different charging capacitors in the sub-stage 2A is different, and the value of the number y of the second driving ends corresponding to different charging capacitors in the sub-stage 2B is different. Thus, in the driving stage 2, the plurality of second driving ends are used to drive the plurality of second driving electrodes of the electromagnetic touch screen, and the number of the second driving ends is not less than the number of the second driving electrodes.

[0178] The electromagnetic touch driving device realizes that the electromagnetic field is generated in the region corresponding to all the first driving electrodes in the driving stage 1, and realizes that the electromagnetic field is generated in the region corresponding to all the second driving electrodes in the driving stage 2 by adopting the driving mode of the embodiment. The inductive electrode is used to collect the inductive signal of the electromagnetic pen in the driving stage 1 and the driving stage 2 respectively. Finally, the coordinate position of the electromagnetic pen is calculated by combining the coordinate information of two dimensions obtained in the driving stage 1 and the driving stage 2. The current direction in each driving coil producing current is consistent in each driving stage by controlling the access of the charging capacitor in each driving stage. Therefore, the change of the electromagnetic field sensed by the electromagnetic touch screen is consistent in each driving stage, so that the signal sensed by the electromagnetic touch screen in the same driving stage can be avoided to be reversed.

[0179] In addition, the second aspect of the utility model provides an electromagnetic touch screen, including the electromagnetic touch driving device in the above-mentioned first aspect or any possible implementation manner 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 is coupled with each other, and the other end of the plurality of first driving electrodes is coupled to the electromagnetic touch driving device.

[0180] In a possible implementation manner, further comprising a plurality of sensing coils arranged along a second direction, the second direction is perpendicular to the first direction, wherein the position of the electromagnetic pen is sensed by sensing the change of the electromagnetic field in each sensing coil. It needs to be explained that the sensing coil in the embodiment can be constructed by multiplexing the second driving electrode in each of the above-mentioned embodiments.

[0181] In addition, the third aspect of the utility model provides an electronic equipment, including the electromagnetic touch screen in the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0182] In addition, the fourth aspect of the utility model provides a touch system, including the electromagnetic touch screen in the above-mentioned third aspect and the electromagnetic pen.

[0183] The terms "first", "second", "third", "fourth" and the like in the description of the utility model and in the above drawings (if any) are used to distinguish like objects, and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the terms so used in the description are interchangeable under appropriate circumstances such that the embodiments of the utility model described herein can be practiced in other than the recited order of the steps or stages mentioned herein. Additionally, the terms "comprising", "having", "including", and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises, has, includes or includes an item or list of items who are not necessarily limited to those stated items or list, but can include other non-stated items or lists not expressly mentioned or inherent to such process, method, product, or apparatus.

[0184] It should be understood that in the utility model, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" is used to describe the association between the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean: only A, only B and A and B exist at the same time, wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c can be single or multiple.

[0185] It should be understood that in the description of the embodiments of the utility model, the meaning of multiple (or multiple) is more than two, greater than, less than, more than, etc. is not included in the number, and above, below, etc. is included in the number.

[0186] In the several embodiments provided by the utility model, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and other division manners can be adopted during actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed objects can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0187] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment of the present application according to actual needs.

[0188] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0189] It should also be understood that the various implementation manners provided by the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0190] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above implementation manners. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An electromagnetic touch driving device, characterized by, An electromagnetic touch screen driving device for coupling to an electromagnetic touch screen, the electromagnetic touch screen comprising a plurality of first drive electrodes arranged along a first direction, one end of each of the plurality of first drive electrodes being coupled to each other, the electromagnetic touch screen driving device comprising: a plurality of first drive terminals for outputting a plurality of first drive voltages to the other end of each of the plurality of first drive electrodes, wherein any two of the first drive electrodes form a drive coil, a current is generated in a portion of the drive coils to generate an electromagnetic field, and the position of an electromagnetic pen is sensed by sensing a change in the electromagnetic field caused by the electromagnetic pen on the electromagnetic touch screen, wherein the electromagnetic touch screen driving device operates in a plurality of drive phases, and the current in each of the drive coils in which the current is generated in each of the drive phases has a same direction. 2.The electromagnetic touch driving device according to claim 1, characterized in that, The electromagnetic touch screen driving device further comprises a plurality of first drive sources coupled to the plurality of first drive terminals respectively for outputting the plurality of first drive voltages to the plurality of first drive terminals respectively, wherein in an i-th drive phase, the plurality of first drive sources output an equal positive first drive voltage to a first i of the plurality of first drive terminals, and output an equal negative first drive voltage to a remaining of the plurality of first drive terminals. 3.The electromagnetic touch driving device according to claim 1, characterized in that, The electromagnetic touch screen driving device further comprises a plurality of first drive sources coupled to the plurality of first drive terminals respectively for outputting the plurality of first drive voltages to the plurality of first drive terminals respectively, wherein the plurality of first drive voltages decrease sequentially along an arrangement direction of the plurality of first drive terminals, and a difference between an i-th first drive voltage and an i+1-th first drive voltage along the arrangement direction is greater than a difference between any other first drive voltage and a next first drive voltage. 4.The electromagnetic touch driving apparatus according to claim 2 or 3, characterized in that, The electromagnetic touch screen further comprises a plurality of second drive electrodes arranged along a second direction, one end of each of the plurality of second drive electrodes being coupled to each other, the second direction being perpendicular to the first direction; the electromagnetic touch screen driving device further comprises a plurality of second drive terminals for outputting a plurality of second drive voltages to the other end of each of the plurality of second drive electrodes, and a plurality of second drive sources for outputting the plurality of second drive voltages to the plurality of second drive terminals respectively; The drive phases comprise a first drive phase and a second drive phase; In the first drive phase, an i-th first drive voltage outputted by an i-th first drive source to an i-th first drive terminal is greater than an i+1-th first drive voltage outputted by an i+1-th first drive source to an i+1-th first drive terminal; In the second drive phase, an i-th second drive voltage outputted by an i-th second drive source to an i-th second drive terminal is greater than an i+1-th second drive voltage outputted by an i+1-th second drive source to an i+1-th second drive terminal.

5. The electromagnetic touch driving device according to claim 1, characterized in that, The electromagnetic touch driving device further comprises a charging capacitor, wherein in the ith driving stage, the positive electrode and the negative electrode of the charging capacitor are coupled to the ith first driving end and the ith+1 first driving end, respectively.

6. The electromagnetic touch driving device according to claim 5, characterized in that, The driving stage comprises a first sub-stage and a second sub-stage, the charging capacitor comprises a first charging capacitor and a second charging capacitor, and the polarities of the first charging capacitor and the second charging capacitor are opposite; In the first sub-stage of the ith driving stage, the anode and the cathode of the first charging capacitor are coupled to the ith first driving end and the ith+1 first driving end, respectively. In the second sub-stage of the ith driving stage, the anode and the cathode of the second charging capacitor are coupled to the ith first driving end and the ith+1 first driving end, respectively. 7.The electromagnetic touch driving apparatus according to claim 6, characterized in that, The electromagnetic touch driving device further comprises 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 first driving electrode, the driving switching circuit comprising a first switch and a second switch; In the first sub-stage of the ith driving stage, the first single-pole double-throw switch and the first switch couple the positive electrode of the first charging capacitor to the ith first driving end, the second single-pole double-throw switch and the second switch couple the negative electrode of the first charging capacitor to the ith+1 first driving end, the third single-pole double-throw switch couples the negative electrode of the second charging capacitor to a reference voltage, and the fourth single-pole double-throw switch grounds the positive electrode of the second charging capacitor. In the second sub-stage of the ith driving stage, the first single-pole double-throw switch and the first switch couple the positive electrode of the second charging capacitor to the ith first driving end, the second single-pole double-throw switch and the second switch couple the negative electrode of the second charging capacitor to the ith+1 first driving end, the third single-pole double-throw switch couples the positive electrode of the first charging capacitor to the reference voltage, and the fourth single-pole double-throw switch grounds the negative electrode of the first charging capacitor. 8.The electromagnetic touch driving apparatus according to claim 5, characterized in that, The driving stage comprises a first sub-stage and a second sub-stage; In the first sub-stage of the ith driving stage, the positive electrode and the negative electrode of the charging capacitor are coupled to the ith first driving end and the ith+1 first driving end, respectively. In the second sub-stage of the ith driving stage, each first driving end is grounded. 9.The electromagnetic touch driving device according to claim 5, characterized in that, The driving stage comprises h sub-stages, and the charging capacitor comprises h charging capacitors with different charging capacities, h being a positive integer greater than 2. In the kth sub-stage of the ith driving stage, the positive electrode and the negative electrode of the kth charging capacitor are coupled to the ith first driving end and the ith+1 first driving end, respectively, k being a positive integer less than or equal to h. 10.The electromagnetic touch driving apparatus of claim 1, wherein, The electromagnetic touch driving device further comprises a charging capacitor, wherein in the ith driving stage, the positive electrode and the negative electrode of the charging capacitor are coupled to the ith first driving end and the ith+m first driving end, m being a positive integer greater than or equal to 2.

11. The electromagnetic touch driving apparatus according to claim 1, characterized in that, The electromagnetic touch control driving device further comprises a charging capacitor, wherein in the ith driving stage, the positive and negative poles of the charging capacitor are coupled to the pth first driving end and the p+qth first driving end respectively, p is a positive integer and varies in each driving stage, q is a positive integer and varies in each driving stage, and each first driving end is coupled to the charging capacitor in at least one driving stage. 12.The electromagnetic touch driving apparatus according to claim 1, characterized in that, The number of the first driving ends is M, the electromagnetic touch control driving device further comprises M / 2 charging capacitors, and the driving stage comprises a first sub-stage and a second sub-stage, M being an even number; In the first sub-stage, one end of the ith charging capacitor is coupled to the 2i-1th first driving end, and the other end of the ith charging capacitor is coupled to the 2i th first driving end, i being a positive integer less than or equal to M / 2; In the second sub-stage, one end of the ith charging capacitor is coupled to the 2i th first driving end, and the other end of the ith charging capacitor is coupled to the 2i+1th first driving end.

13. The electromagnetic touch driving apparatus according to claim 1, characterized in that, The number of the first driving ends is M, the electromagnetic touch control driving device further comprises M / 2r charging capacitors, and the driving stage comprises a first sub-stage and a second sub-stage, M being an even number; In the first sub-stage, one end of the ith charging capacitor is coupled to the 2ri-2r+1th first driving end, and the other end of the ith charging capacitor is coupled to the 2ri-r+1th first driving end, i being a positive integer less than or equal to M / 2r; In the second sub-stage, one end of the ith charging capacitor is coupled to the 2ri-r+1th first driving end, and the other end of the ith charging capacitor is coupled to the 2ri+1th first driving end.

14. The electromagnetic touch driving device according to claim 1, characterized in that, The electromagnetic touch control driving device further comprises a plurality of charging capacitors, and the driving stage comprises a first sub-stage and a second sub-stage; In the first sub-stage, for the ith charging capacitor, according to the arrangement order of the plurality of first driving ends, from the first driving ends that have not been coupled by the previous i-1 charging capacitors, x first driving ends arranged in the front are selected, one end of the ith charging capacitor is coupled to the first first driving end of the x first driving ends, and the other end of the ith charging capacitor is coupled to the last first driving end of the x first driving ends; In the second sub-stage, for the ith charging capacitor, according to the arrangement order of the plurality of first driving ends, from the first driving ends that have not been coupled by the previous i-1 charging capacitors and have not been coupled in the first sub-stage, y first driving ends arranged in the front are selected, one end of the ith charging capacitor is coupled to the first first driving end of the y first driving ends, and the other end of the ith charging capacitor is coupled to the last first driving end of the y first driving ends.

15. An electromagnetic touch screen, characterized by Comprise: The electromagnetic touch control driving device according to any one of claims 1 to 14; And A plurality of first driving electrodes arranged in 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 control driving device.

16. The electromagnetic touch screen of claim 15, wherein, Also included are a plurality of sensing coils arranged in a second direction, the second direction being perpendicular to the first direction, wherein the position of the electromagnetic pen is sensed by sensing a change in the electromagnetic field within each of the sensing coils.

17. An electronic device, comprising: An electromagnetic touch screen comprising the electromagnetic touch screen of claim 15 or 16.

18. A touch system, comprising: Comprising: An electromagnetic touch screen comprising the electromagnetic touch screen of claim 15 or 16. And, An electromagnetic pen.

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