Method for driving electromagnetic screen and electromagnetic input device

Abstract

This application discloses a driving method and an electromagnetic input device for an electromagnetic screen. The electromagnetic screen includes A input areas, each input area including multiple parallel transmitting coils, where A is a positive integer greater than or equal to 1. The driving method includes: transmitting a first driving signal to j first transmitting coils and transmitting a second driving signal to k second transmitting coils during the current driving cycle, where j and k are positive integers greater than or equal to 1, and connecting one end of each of the first and second transmitting coils in series; wherein the first driving signal and the second driving signal are 180 degrees out of phase, so that a superimposed magnetic field is formed in the destination area of ​​the electromagnetic screen to charge the electromagnetic pen; and controlling the other transmitting coils, except for the first and second transmitting coils, to be in a floating state.

Description

Technical Field

[0001] This application relates to the field of electromagnetic input technology, specifically to a driving method for an electromagnetic screen and an electromagnetic input device. Prior Technology

[0002] Currently, electromagnetic input devices include an electromagnetic screen and an electromagnetic pen. The electromagnetic pen is charged by receiving electromagnetic waves radiated by the electromagnetic screen and sends a feedback signal back to the electromagnetic screen. The electromagnetic screen then detects the contact position of the electromagnetic pen based on the feedback signal. Finally, the two work together to complete the input operation of the electromagnetic input device.

[0003] However, conventional electromagnetic input devices have low efficiency in charging electromagnetic pens via their electromagnetic screens, and also suffer from high energy consumption. Summary of the Invention

[0004] In view of this, this application provides a driving method for an electromagnetic screen and an electromagnetic input device to improve the charging efficiency of an electromagnetic pen and reduce the power consumption of the electromagnetic screen. The technical solution of this application is as follows:

[0005] The first aspect of this application provides a driving method for an electromagnetic screen, the electromagnetic screen including A input areas, each input area including multiple parallel transmitting coils, one end of each transmitting coil in each input area being connected in series, A being a positive integer greater than or equal to 1; the driving method includes: in the current driving cycle, transmitting a first driving signal to j first transmitting coils and transmitting a second driving signal to k second transmitting coils, j and k being positive integers greater than or equal to 1; wherein the first driving signal and the second driving signal are 180 degrees out of phase, so that a superimposed magnetic field is formed in the destination area of ​​the electromagnetic screen to charge the electromagnetic pen; controlling the other transmitting coils except the first and second transmitting coils to be in a floating state.

[0006] In one embodiment of this application, A=1, j=k=1, the first transmitting coil and the second transmitting coil are adjacent, and the destination region includes the region between each of the first transmitting coil and the second transmitting coil.

[0007] In one embodiment of this application, A=1, j=k 2, each first coil group is adjacent to one of the second coil groups, and the destination region includes the region between each first coil group and the second coil group; wherein, each first coil group includes at least one continuously arranged first transmitting coil, and each second coil group includes at least one continuously arranged second transmitting coil.

[0008] In one embodiment of this application, the current driving cycle includes at least two coil pairs, each coil pair including a first coil and an adjacent second coil; or, each coil pair includes j=k2 first coils and an adjacent second coil.

[0009] In one embodiment of this application, A 2,j=k 2, the transmission of the first driving signal to j first transmitting coils and the transmission of the second driving signal to k second transmitting coils includes: transmitting the first driving signal to i first transmitting coils and the second driving signal to n second transmitting coils in each input region, where i and n are positive integers greater than or equal to 1; wherein, A i=j, A n=k.

[0010] In one embodiment of this application, i=n=1, each of the first transmitting coils is adjacent to one of the second transmitting coils, and the destination region includes the region between each of the first transmitting coils and the second transmitting coils.

[0011] In one embodiment of this application, i=n 2, each first coil group is adjacent to one of the second coil groups, and the destination region includes the region between each first coil group and the second coil group; wherein, each first coil group includes at least one continuously arranged first transmitting coil, and each second coil group includes at least one continuously arranged second transmitting coil.

[0012] In one embodiment of this application, the driving method further includes: transmitting a first driving signal to j third transmitting coils and transmitting a second driving signal to k fourth transmitting coils in the next driving cycle; and controlling the remaining transmitting coils other than the third and fourth transmitting coils to be in a floating state.

[0013] In one embodiment of this application, the third transmitting coil is different from both the first transmitting coil and the fourth transmitting coil is different from both the second transmitting coil.

[0014] In one embodiment of this application, the third transmitting coil partially overlaps with the first transmitting coil, and the fourth transmitting coil partially overlaps with the second transmitting coil.

[0015] In one embodiment of this application, the electromagnetic screen further includes multiple parallel receiving coils, the receiving coils being insulated from the transmitting coils; the driving method further includes: receiving electromagnetic wave signals from the electromagnetic pen via the receiving coils, and obtaining the contact position of the electromagnetic pen on the electromagnetic screen based on the electromagnetic wave signals.

[0016] A second aspect of this application provides an electromagnetic input device, including an electromagnetic screen and a controller. The electromagnetic screen includes multiple parallel transmitting coils, and the controller is connected to the transmitting coils. The controller is used to execute the driving method.

[0017] It is understood that, in the embodiments of this application, when driving the electromagnetic screen, by transmitting a first driving signal to j first transmitting coils and a second driving signal to k second transmitting coils, a superimposed magnetic field is formed in the destination area of ​​the electromagnetic screen, thereby improving the charging efficiency of the electromagnetic pen, and reducing the voltage amplitude of the electromagnetic screen driving signal while ensuring the charging efficiency of the electromagnetic pen, thereby reducing the power consumption of the electromagnetic screen. Simple Explanation of the Diagram

[0018] Figure 1 is a schematic block diagram of an electromagnetic screen provided in an embodiment of this application. Figure 2 is a flowchart illustrating a driving method for an electromagnetic screen provided in an embodiment of this application. Figure 3 is a schematic block diagram of an electromagnetic screen and transmitting coil provided in an embodiment of this application. Figure 4 is a schematic diagram of a transmitting coil and a driving signal provided in an embodiment of this application. Figure 5 is a schematic diagram of a second type of transmitting coil and driving signal provided in an embodiment of this application. Figure 6 is a schematic block diagram of a transmitting coil provided in an embodiment of this application. Figure 7 is a schematic block diagram of a second type of transmitting coil provided in an embodiment of this application. Figure 8 is a schematic block diagram of a third type of transmitting coil provided in an embodiment of this application. Figure 9 is a schematic block diagram of the second type of electromagnetic screen and transmitting coil provided in the embodiments of this application. Figure 10 is a flowchart illustrating the second electromagnetic screen driving method provided in the embodiments of this application. Figure 11 is a schematic block diagram of an electromagnetic input device provided in an embodiment of this application. Implementation

[0019] It should be noted that the methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the method. Without departing from the scope of the claim, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0020] It should also be noted that the methods or flowcharts disclosed in the embodiments of this application include one or more steps for implementing the method. Without departing from the scope of the claim, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0021] Currently, electromagnetic input devices include an electromagnetic screen and an electromagnetic pen. The electromagnetic pen is charged by receiving electromagnetic waves radiated by the electromagnetic screen and sends a feedback signal back to the electromagnetic screen. The electromagnetic screen then detects the contact position of the electromagnetic pen based on the feedback signal. Finally, the two work together to complete the input operation of the electromagnetic input device.

[0022] However, conventional electromagnetic input devices have low efficiency in charging electromagnetic pens via their electromagnetic screens, and also suffer from high energy consumption.

[0023] This application provides a driving method for an electromagnetic screen and an electromagnetic input device to improve the charging efficiency of an electromagnetic pen and reduce the power consumption of the electromagnetic screen.

[0024] Please refer to Figure 1, which is a schematic block diagram of an electromagnetic screen provided in an embodiment of this application. The electromagnetic screen 100 includes multiple parallel transmitting coils TX and multiple parallel receiving coils RX. One end of each transmitting coil TX is connected in series.

[0025] In this embodiment, the transmitting coil TX is insulated from the receiving coil RX, and all transmitting coils TX are evenly distributed with the same distance between adjacent transmitting coils TX. Similarly, all receiving coils RX are evenly distributed with the same distance between adjacent receiving coils RX. The transmitting coil TX receives the drive signal, converts it into electromagnetic waves, and radiates it outward to charge the electromagnetic pen. After being charged by the electromagnetic waves, the electromagnetic pen sends a feedback signal back to the electromagnetic screen 100, allowing the electromagnetic screen 100 to receive the feedback signal via the receiving coil RX and determine the contact position of the electromagnetic pen based on the feedback signal.

[0026] The electromagnetic screen 100 is used in various electromagnetic input devices, such as graphics tablets and handwriting tablets, and works in conjunction with an electromagnetic pen. The electromagnetic pen has a resonant circuit inside to receive electromagnetic waves radiated outward by the transmitting coil TX for charging, and then converts the electromagnetic waves into a feedback signal, which is fed back to the electromagnetic screen 100 by the receiving coil RX.

[0027] The following describes a driving method for an electromagnetic screen according to an embodiment of this application, with reference to Figure 1 and Figure 2. The method includes the following steps:

[0028] Step S21: In the current driving cycle, transmit the first driving signal to j first transmitting coils and transmit the second driving signal to k second transmitting coils, where j and k are positive integers greater than or equal to 1.

[0029] In this embodiment, one end of the first transmitting coil and the second transmitting coil are connected in series, and the other end is used to receive the corresponding driving signal. The first driving signal and the second driving signal are 180 degrees out of phase, so that a superimposed magnetic field is formed in the target area of ​​the electromagnetic screen to charge the electromagnetic pen. Since one end of the first transmitting coil and the second transmitting coil are connected in series, and the first driving signal and the second driving signal are 180 degrees out of phase, at the same time, the direction of the electromagnetic field radiated outward by the first transmitting coil is the same as the direction of the electromagnetic field radiated outward by the second transmitting coil. Therefore, the electromagnetic fields radiated by the two are superimposed in the area between the first transmitting coil and the second transmitting coil.

[0030] For example, the first driving signal can be a forward current (as shown in Figure 3, TX1 current direction), and the second driving signal can be a reverse current (as shown in Figure 3, TX0 current direction). When the direction of the electromagnetic field radiated outward by the first transmitting coil is determined to be counterclockwise according to the right-hand screw rule, the direction of the electromagnetic field radiated outward by the second transmitting coil is determined to be clockwise according to the right-hand screw rule. Therefore, the electromagnetic fields radiated by the two coils are superimposed in the region between the first and second transmitting coils.

[0031] It is understandable that, under the premise of driving the transmitting coil with the same amplitude driving signal, this solution can improve the charging efficiency of the electromagnetic pen by forming a superimposed magnetic field in the destination area compared to the conventional technology. Therefore, while achieving the same charging efficiency of the electromagnetic pen as the conventional technology, this solution can also reduce the voltage amplitude of the driving signal, thereby reducing the power consumption of the electromagnetic screen.

[0032] In some embodiments, in the next driving cycle, a first driving signal can be transmitted to j first transmitting coils and a second driving signal can be transmitted to k second transmitting coils in the electromagnetic screen. This process continues, with multiple driving cycles used to transmit driving signals to all the first and second transmitting coils in the electromagnetic screen, ultimately completing the scanning of the entire electromagnetic screen to determine the contact position of the electromagnetic pen. The first transmitting coils and the second transmitting coils in each driving cycle are different to improve the scanning speed of the electromagnetic screen. Alternatively, the first transmitting coils and the second transmitting coils in adjacent driving cycles may partially overlap to improve scanning accuracy and thus the accuracy of obtaining the contact position of the electromagnetic pen.

[0033] In this embodiment of the application, the electromagnetic screen may further include a driving circuit and a controller. The controller is connected to the driving circuit, and the driving circuit is connected to each transmitting coil. The controller controls the driving circuit to transmit a first driving signal to the first transmitting coil and controls the driving circuit to transmit a second driving signal to the second transmitting coil.

[0034] Step S22: Control the remaining transmitting coils, except for the first and second transmitting coils, to be in a floating state.

[0035] In this embodiment, the aforementioned floating state includes a state where the coil is neither energized nor grounded, which is equivalent to the transmitting coil being disconnected from the driving circuit, thus electrically suspending the transmitting coil. Specifically, during the current driving cycle, the controller controls the remaining transmitting coils (excluding the first and second transmitting coils) to enter a floating state to avoid parasitic capacitive coupling between the remaining transmitting coils and the first and second transmitting coils, thereby preventing interference noise.

[0036] It is understood that, in the embodiments of this application, when driving the electromagnetic screen, by transmitting a first driving signal to j first transmitting coils and a second driving signal to k second transmitting coils, a superimposed magnetic field is formed in the destination area of ​​the electromagnetic screen, thereby improving the charging efficiency of the electromagnetic pen, and reducing the voltage amplitude of the electromagnetic screen driving signal while ensuring the charging efficiency of the electromagnetic pen, thereby reducing the power consumption of the electromagnetic screen.

[0037] Please refer to Figure 3, which is a schematic block diagram of an electromagnetic screen and transmitting coil provided in an embodiment of this application. The electromagnetic screen 100 includes an input area 110, that is, the entire electromagnetic screen 100 is a single input area 110, and the input area 110 includes multiple parallel transmitting coils.

[0038] In this embodiment, one end of each transmitting coil in the input region 110 is connected in series, and the other end of each transmitting coil is used to receive a drive signal. In some embodiments, one end of at least four consecutively arranged transmitting coils in the input region 110 is connected in series.

[0039] When transmitting a first drive signal to j first transmitting coils TX0 and a second drive signal to k second transmitting coils TX1 during the current drive cycle T0, j=k 1 (in the example in the figure, j=k=1), and each first transmitting coil TX0 is adjacent to one of the second transmitting coils TX1, and the destination area includes the area between each first transmitting coil TX0 and the second transmitting coil TX1.

[0040] The first driving signal, which is also the second driving signal, can be a square wave signal with a phase difference of 180 degrees, as shown in Figure 4, which is a schematic diagram of a transmitting coil and driving signal provided in an embodiment of this application.

[0041] During the current driving cycle T0, since the first transmitting coil TX0 and the second transmitting coil TX1 are connected in series on the same side, during the positive half-cycle of one signal cycle of the square wave signal, the current in the first transmitting coil TX0 flows to the second transmitting coil TX1. During the negative half-cycle of one signal cycle of the square wave signal, the current in the second transmitting coil TX1 flows to the first transmitting coil TX0, as shown in Figure 3. This causes the direction of the superimposed magnetic field formed in the destination area to change according to the frequency of the square wave signal, thereby generating oscillation with the resonant circuit inside the electromagnetic pen.

[0042] In the next driving cycle T1, the first driving signal is transmitted to j first transmitting coils TX2 and the second driving signal is transmitted to k second transmitting coils TX3 (in the example in the figure, j=k=1), until all transmitting coils are driven after multiple driving cycles.

[0043] Please refer to Figure 5, which is a schematic diagram of the second type of transmitting coil and driving signal provided in the embodiment of this application. In the current driving cycle T0, a first driving signal is transmitted to the first coil group, and a second driving signal is transmitted to the second coil group. Each first coil group is adjacent to one of the second coil groups, and the destination area includes the area between each first coil group and the second coil group. The first coil group includes at least one continuously arranged first transmitting coil (exemplified by transmitting coils TX0 and TX1 in Figure 4), and the second coil group includes at least one continuously arranged second transmitting coil (exemplified by transmitting coils TX2 and TX3 in Figure 4), j=k2.

[0044] In some embodiments, within the current driving cycle T0, a first driving signal can be transmitted to multiple first coil groups, and a second driving signal can be transmitted to multiple second coil groups. The number of first coil groups is the same as the number of second coil groups, and one of the first coil groups is adjacent to one of the second coil groups, so as to form a stronger superimposed magnetic field in the destination area of ​​the electromagnetic screen, further improving the charging efficiency of the electromagnetic pen. In the embodiments of this application, the first driving signal is transmitted to the first coil group and the second driving signal is transmitted to the second coil group in the next driving cycle T1. At this time, the first coil group includes the first transmitting coils TX1 and TX2, the second coil group includes the second transmitting coils TX3 and TX4, and so on, and after multiple driving cycles, the driving of all transmitting coils is completed. Since the first transmitting coils in adjacent driving cycles partially overlap, and the second transmitting coils in adjacent driving cycles partially overlap, the scanning accuracy can be improved, thereby improving the accuracy of obtaining the position of the electromagnetic pen contact point.

[0045] Among them, when the first drive signal and the second drive signal are square wave signals and the waveform phase difference is 180°, the current of the first transmitting coil TX0 and TX1 flows to the second transmitting coil TX2 and TX3 within the current drive cycle T0, which is the positive half cycle, as shown in Figure 6.

[0046] During the negative half-cycle of one signal cycle of the square wave signal, the current in the second transmitting coils TX2 and TX3 flows to the first transmitting coils TX0 and TX1. As shown in Figure 7, the direction of the superimposed magnetic field formed in the destination area changes according to the phase of the square wave signal, thereby generating oscillation with the resonant circuit inside the electromagnetic pen.

[0047] In some embodiments, the current driving cycle includes at least two coil pairs, each coil pair including a first coil and an adjacent second coil, or each coil pair including j=k2 first coils and an adjacent second coil. As shown in FIG8, the current driving cycle may include at least two coil pairs (two coil pairs are shown as an example in FIG8), each coil pair including a first coil group and an adjacent second coil group, so that the electromagnetic screen is configured with at least two destination areas to charge at least two electromagnetic pens, thereby enabling multiple electromagnetic pens to simultaneously perform touch operations on the electromagnetic screen.

[0048] In Figure 8, transmitting coils TX1-TX4 form one of the above-mentioned coil pairs, and transmitting coils TX31-TX34 form another coil pair. That is, transmitting coils TX1-TX2 are the first coils, and transmitting coils TX3-TX4 are the second coils. Transmitting coils TX31-TX32 are the first coils, and transmitting coils TX33-TX34 are the second coils.

[0049] Please refer to Figure 9, which is a schematic block diagram of the second type of electromagnetic screen and transmitting coil provided in the embodiment of this application. The electromagnetic screen 100 includes one A input area 110, A2 (A=2 in the example of Figure 7), and each input area 110 includes multiple parallel transmitting coils TX1~TXn.

[0050] In this embodiment of the application, transmitting a first driving signal to j first transmitting coils and transmitting a second driving signal to k second transmitting coils includes: transmitting a first driving signal to i first transmitting coils and transmitting a second driving signal to n second transmitting coils in each input region, where i and n are positive integers greater than or equal to 1, where Ai = j, An = k, and j = k 2.

[0051] In each input region, one of the common ends of each transmitting coil is connected in series. In some embodiments, at least four consecutively arranged transmitting coils in the input region have one of their common ends connected in series.

[0052] In this embodiment of the application, the electromagnetic screen 100 is divided into A input regions 110. In each input region 110, one of the transmitting coils TX1 to TXn is connected in series on the same side end, so that the driving method of any of the embodiments in Figures 2 to 8 is executed on each input region 110 in the current driving cycle.

[0053] For example, i=n=1, each first transmitting coil is adjacent to one of the second transmitting coils, and the destination region includes the area between each first transmitting coil and the second transmitting coil.

[0054] For example, i=n 2, each first coil group is adjacent to one of the second coil groups, and the destination region includes the area between each first coil group and the second coil group. Each first coil group includes at least two consecutively arranged first transmitting coils, and each second coil group includes at least two consecutively arranged second transmitting coils.

[0055] The embodiments of this application can accelerate the speed of driving all transmitting coils. It can be understood that the more input areas 110 are divided, the faster the speed of driving all transmitting coils is, which is A times faster than the speed without screen division. The more coils in the first coil group and the second coil group, the stronger the superimposed magnetic field in the destination area of ​​the electromagnetic screen, which can further improve the charging efficiency of the electromagnetic pen.

[0056] Please refer to Figure 10, which is a flowchart illustrating the second electromagnetic screen driving method provided in this application embodiment. Compared with the driving method shown in Figure 2, it further includes the following steps:

[0057] Step S23: In the next driving cycle, transmit the first driving signal to j third transmitting coils and transmit the second driving signal to k fourth transmitting coils, with one of the third transmitting coils and the fourth transmitting coil connected in series at one end.

[0058] Step S24: Control the remaining transmitting coils, except for the third and fourth transmitting coils, to be in a floating state.

[0059] In this embodiment, the third transmitting coil is different from both the first and second transmitting coils, thereby improving the scanning speed of the electromagnetic screen. Alternatively, the third transmitting coil partially overlaps with the first transmitting coil, and the fourth transmitting coil partially overlaps with the second transmitting coil, to improve scanning accuracy and thus improve the accuracy of obtaining the position of the electromagnetic pen contact point.

[0060] While performing the driving method shown in Figure 2 or Figure 10, the driving method also includes: receiving the electromagnetic wave signal of the electromagnetic pen by the receiving coil, and obtaining the contact position of the electromagnetic pen on the electromagnetic screen based on the electromagnetic wave signal.

[0061] Please refer to Figure 11, which is a schematic block diagram of an electromagnetic input device provided in an embodiment of this application. The electromagnetic input device 10 includes an electromagnetic screen 100 and a controller 101. The electromagnetic screen 100 includes multiple parallel transmitting coils. The controller 101 is connected to the transmitting coils, or is connected to the transmitting coils via a drive circuit.

[0062] The controller 101 is used to execute the driving method of any of the above embodiments. It is understood that the beneficial effects of the electromagnetic input device 10 can be referred to the beneficial effects of the driving method in the foregoing embodiments, and will not be repeated here.

[0063] This application also provides a computer storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the above-described electromagnetic screen driving method.

[0064] In the above embodiments, implementation can be achieved entirely or partially by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are generated wholly or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer storage medium or transmitted via the computer storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital versatile discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0065] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks. Unless otherwise specified, the technical features of this embodiment and the implementation scheme can be combined arbitrarily.

[0066] The embodiments described above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Without departing from the spirit of this application, all modifications and improvements made by those skilled in the art to the technical solutions of this application should fall within the protection scope defined in the claims of this application.

[0067] 100: Electromagnetic shield TX: Transmitting coil RX: Receiver coil TX0~TXn: Transmitting coils 101: Controller 10: Electromagnetic input device S21~S24: Steps

Claims

1. A driving method for an electromagnetic screen, improved in that the electromagnetic screen includes A input regions, each input region includes multiple parallel transmitting coils, and one common end of each transmitting coil in each input region is connected in series, where A is a positive integer greater than or equal to 1; the driving method includes: During the current driving cycle, a first driving signal is transmitted to j first transmitting coils and a second driving signal is transmitted to k second transmitting coils, where j and k are positive integers greater than or equal to 1; wherein the first driving signal and the second driving signal are 180 degrees out of phase, so that a superimposed magnetic field is formed in the destination area of ​​the electromagnetic screen to charge at least one electromagnetic pen; the other transmitting coils, except for the first and second transmitting coils, are controlled to be in a floating state.

2. The driving method as described in request item 1, wherein, A=1, j=k=1, the first transmitting coil is adjacent to the second transmitting coil, and the destination area includes the area between each of the first transmitting coil and the second transmitting coil.

3. The driving method as described in request item 1, wherein, A=1, j=k 2, each first coil group is adjacent to one of the second coil groups, and the destination area includes the area between each first coil group and the second coil group; wherein each first coil group includes at least one continuously arranged first transmitting coil, and each second coil group includes at least one continuously arranged second transmitting coil.

4. The driving method as described in claim 3, wherein, The current driving cycle includes at least two coil pairs, each coil pair including a first coil pair and an adjacent second coil pair; or, each coil pair includes j=k2 first coil pairs and an adjacent second coil pair.

5. The driving method as described in request item 1, wherein, A 2, j=k 2, the step of transmitting a first driving signal to j first transmitting coils and transmitting a second driving signal to k second transmitting coils includes: transmitting a first driving signal to i first transmitting coils and transmitting a second driving signal to n second transmitting coils in each input region, where i and n are positive integers greater than or equal to 1; where A i=j and A n=k.

6. The driving method as described in claim 5, wherein, i=n=1, each of the first transmitting coils is adjacent to one of the second transmitting coils, and the destination region includes the region between each of the first transmitting coils and the second transmitting coils.

7. The driving method as described in claim 4, wherein, i=n 2, each first coil group is adjacent to one of the second coil groups, and the destination area includes the area between each first coil group and the second coil group; wherein each first coil group includes at least one continuously arranged first transmitting coil, and each second coil group includes at least one continuously arranged second transmitting coil.

8. The driving method as described in any one of claims 1 to 7, wherein, The driving method further includes: transmitting a first driving signal to j third transmitting coils and a second driving signal to k fourth transmitting coils in the next driving cycle; and controlling the remaining transmitting coils, excluding the third and fourth transmitting coils, to be in a floating state.

9. The driving method as described in claim 8, wherein, The third transmitting coil is different from both the first transmitting coil and the fourth transmitting coil is different from both the second transmitting coil.

10. The driving method as described in claim 8, wherein, The third transmitting coil partially overlaps with the first transmitting coil, and the fourth transmitting coil partially overlaps with the second transmitting coil.

11. The driving method as described in request item 1, wherein, The electromagnetic screen also includes multiple parallel receiving coils, which are insulated from the transmitting coils; The driving method further includes: receiving electromagnetic wave signals from the electromagnetic pen via the receiving coil, and obtaining the contact position of at least one of the electromagnetic pens on the electromagnetic screen based on the electromagnetic wave signals.

12. An electromagnetic input device, improved in that it includes an electromagnetic screen and a controller, the electromagnetic screen including a plurality of parallel transmitting coils, the controller being connected to the transmitting coils, the controller being configured to perform a driving method as described in any one of claims 1 to 11.

Images