Electromagnetic handwriting display control device, electromagnetic handwriting device and electronic equipment

Abstract

The present application discloses an electromagnetic handwriting display control device, an electromagnetic handwriting device and an electronic device, wherein the electromagnetic handwriting display control device includes a display driving module, an electromagnetic handwriting signal processing module and an antenna module; the display driving module is used to transmit the display driving signal to the information processing module; the electromagnetic handwriting signal processing module is used to receive the display driving signal, synchronously generate a control instruction according to the display driving signal, and perform electromagnetic handwriting sensing signal processing according to the control instruction; the antenna module is used to receive the control instruction, and determine whether to return the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module according to the control instruction. The present application can realize reasonable electromagnetic handwriting sensing signal return processing, avoid the excitation magnetic field interference of the display driving signal, improve the stability of the electromagnetic handwriting coordinates, and prevent the electromagnetic handwriting coordinates from changing. The present application is widely used in the field of electromagnetic handwriting technology.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic handwriting technology, and in particular to an electromagnetic handwriting display control device, an electromagnetic handwriting device and an electronic device. Background Art

[0002] When electromagnetic handwriting technology is applied to display screens, the antenna board is in close contact with the LCD screen, so in addition to sensing the electromagnetic handwriting signal, the antenna board will also sense the display drive control signal. The display drive control signal is a square wave, which will produce different degrees of magnetic field excitation effect on the electromagnetic antenna board. The square wave is composed of odd-order resonant waves with the same frequency as the electromagnetic handwriting signal, so the display drive control signal is easily mixed into the timing of the electromagnetic handwriting signal and the receiving signal.

[0003] Therefore, the electromagnetic handwriting device may receive a signal formed by the superposition of the electromagnetic handwriting signal and the display drive control signal, which will cause the obtained signal to be different from the original electromagnetic handwriting signal, resulting in inconsistency in the coordinates after the handwriting coordinates are calculated, resulting in an offset, that is, the handwritten content on the electromagnetic handwriting board is inconsistent with the content displayed on the display screen, resulting in a deviation, which makes it visually visible that the handwriting coordinates on the display screen will jump in different directions, affecting the user experience. Summary of the invention

[0004] In order to solve at least one technical problem existing in the above-mentioned related technologies, the embodiments of the present application propose an electromagnetic handwriting display control device, an electromagnetic handwriting device and an electronic device, aiming to avoid interference from display drive signals, realize reasonable reception of electromagnetic handwriting signals, and improve the stability of electromagnetic handwriting coordinates.

[0005] On the one hand, the embodiment of the present application provides an electromagnetic handwriting display control device, including a display driving module, an electromagnetic handwriting signal processing module and an antenna module;

[0006] The display driving module is connected to the electromagnetic handwriting signal processing module and is used to transmit the display driving signal to the information processing module;

[0007] The electromagnetic handwriting signal processing module is used to receive the display driving signal, synchronously generate a control instruction according to the display driving signal, and perform electromagnetic handwriting sensing signal processing according to the control instruction;

[0008] The antenna module is connected to the electromagnetic handwriting signal processing module and is used to receive the control instruction and determine whether to return the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module according to the control instruction.

[0009] In some embodiments, the electromagnetic handwriting signal processing module is used to monitor the driving timing of the display driving signal, synchronously generate a control instruction according to the display driving signal and determine the instruction state of the control instruction; the instruction state is a first instruction state or a second instruction state; the first instruction state corresponds to a phase stable state of the display driving signal; the second instruction state corresponds to a phase change state of the display driving signal;

[0010] The electromagnetic handwriting signal processing module is used for determining the electromagnetic handwriting processing sequence as the electromagnetic handwriting receiving sequence and performing the electromagnetic handwriting sensing signal processing when the instruction state is the first instruction state;

[0011] The electromagnetic handwriting signal processing module is further used to determine that the electromagnetic handwriting processing sequence is an electromagnetic handwriting non-receiving sequence and stop the electromagnetic handwriting sensing signal processing when the instruction state is the second instruction state.

[0012] In some embodiments, the electromagnetic handwriting signal processing module is used to synchronously generate the control instruction and determine that the instruction state is the first instruction state when the display driving signal is in the first phase or the second phase;

[0013] The electromagnetic handwriting signal processing module is also used to synchronously generate the control instruction and determine that the instruction state is the second instruction state when the display driving signal changes from the first phase to the second phase, or changes from the second phase to the first phase.

[0014] In some embodiments, the apparatus further comprises a data multiplexer;

[0015] The data multiplexer is connected to the antenna module, and is used to receive the control instruction, switch and control the signal receiving and sending path according to the control instruction, transmit the control instruction to the antenna module, and receive the electromagnetic handwriting induction signal returned by the antenna module.

[0016] In some embodiments, the antenna module includes an antenna coil;

[0017] The antenna coil is connected to the data multiplexer and is used to send an excitation signal outwardly;

[0018] The antenna coil is connected to the data multiplexer, and is used to receive the electromagnetic handwriting induction signal, and transmit the electromagnetic handwriting induction signal to the data multiplexer; the electromagnetic handwriting induction signal is an induction signal generated by performing an electromagnetic handwriting operation in response to the excitation signal;

[0019] The data multiplexer is also used to transmit the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module for signal noise reduction processing.

[0020] In some embodiments, the electromagnetic handwriting signal processing module further includes a signal amplifier, a bandpass filter, a synchronous detector, a low-pass filter, a sample-and-hold integrator, a digital-to-analog converter, and an electromagnetic handwriting signal processor;

[0021] The signal amplifier is connected to the data multiplexer through the transceiver switch, and is used to receive the electromagnetic handwriting sensing signal, amplify the electromagnetic handwriting sensing signal, and obtain an amplified signal;

[0022] The bandpass filter is used to receive the amplified signal, filter irrelevant frequency segments in the amplified signal, and obtain a first filtered signal;

[0023] The synchronous detector is used to receive the first filtered signal, extract the frequency segment specified in the first filtered signal, and obtain the second filtered signal;

[0024] The low-pass filter is used to receive the second filtered signal, filter out the AC signal in the second filtered signal, and obtain a third filtered signal;

[0025] The sample-and-hold integrator is used to receive the third filtered signal, integrate the third filtered signal, and obtain an integrated signal;

[0026] The digital-to-analog converter is used to perform digital-to-analog conversion on the integrated signal to obtain a digital signal, and transmit the digital signal to the electromagnetic handwriting signal processor.

[0027] In some embodiments, the electromagnetic handwriting signal processor is used to analyze the digital signal, obtain electromagnetic handwriting information, and transmit the electromagnetic handwriting information to the display driving module; the electromagnetic handwriting information includes handwriting coordinate information and handwriting pressure information;

[0028] The display driving module is used for performing synchronous display in response to the electromagnetic handwriting operation according to the electromagnetic handwriting information.

[0029] In some embodiments, the display driving module includes a display screen and a screen driving board; the screen driving board is used to respond to the electromagnetic handwriting operation, synchronously receive the corresponding electromagnetic handwriting information, and control the display screen to synchronously display the electromagnetic handwriting information.

[0030] On the other hand, an embodiment of the present application provides an electromagnetic handwriting device, which includes an electromagnetic pen and the electromagnetic handwriting display control device described in the first aspect.

[0031] In yet another aspect, an embodiment of the present application provides an electronic device, which includes the electromagnetic handwriting device described in claim 9.

[0032] The present application provides an electromagnetic handwriting display control device, an electromagnetic handwriting device, and an electronic device, which generates a control instruction according to a display drive signal through an electromagnetic handwriting signal processing module, performs electromagnetic handwriting sensing signal processing according to the control instruction, and an antenna module controls the return of the electromagnetic handwriting sensing signal according to the control instruction. The present application can realize reasonable electromagnetic handwriting sensing signal return processing according to the display drive signal to complete the electromagnetic handwriting display, avoid the excitation magnetic field interference of the display drive signal, improve the stability of the electromagnetic handwriting coordinates, prevent the electromagnetic handwriting coordinates from changing, and greatly improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an electromagnetic handwriting display control device provided in an embodiment of the present application;

[0034] Figure 2 It is a timing diagram of electromagnetic handwriting processing timing without synchronous multi-tasking processing in the prior art;

[0035] Figure 3 It is a timing diagram of the electromagnetic handwriting processing timing after synchronous multi-tasking processing in the embodiment of the present application;

[0036] Figure 4 This is another optional structural diagram of an electromagnetic handwriting display control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0040] Reference Figure 1 , Figure 1 : is an optional structural diagram of an electromagnetic handwriting display control device provided in an embodiment of the present application, the electromagnetic handwriting display control device comprising:

[0041] A display driving module, connected to the electromagnetic handwriting signal processing module, for transmitting a display driving signal to the information processing module;

[0042] The electromagnetic handwriting signal processing module is used to receive the display driving signal, generate a control instruction according to the display driving signal, and process the electromagnetic handwriting sensing signal according to the control instruction;

[0043] The antenna module is connected to the electromagnetic handwriting signal processing module and is used to receive a control instruction and determine whether to return the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module according to the control instruction.

[0044] In some embodiments, the electromagnetic handwriting signal processing module is used to monitor the driving timing of the display driving signal, synchronously generate a control instruction according to the display driving signal and determine the instruction state of the control instruction; the instruction state is a first instruction state or a second instruction state; the first instruction state corresponds to a phase stable state of the display driving signal; the second instruction state corresponds to a phase change state of the display driving signal;

[0045] The electromagnetic handwriting signal processing module is used to determine the electromagnetic handwriting processing sequence as the electromagnetic handwriting receiving sequence and perform electromagnetic handwriting sensing signal processing when the instruction state is the first instruction state;

[0046] The electromagnetic handwriting signal processing module is also used to determine that the electromagnetic handwriting processing sequence is the electromagnetic handwriting non-receiving sequence and stop the electromagnetic handwriting sensing signal processing when the instruction state is the second instruction state.

[0047] In some embodiments, the first phase is a high level phase, and the second phase is a low level phase. Specifically, the electromagnetic handwriting signal processing module is used to synchronously generate a control instruction and determine that the instruction state is the first instruction state when the driving timing is the first phase or the second phase;

[0048] The electromagnetic handwriting signal processing module is also used to synchronously generate a control instruction and determine that the instruction state is the second instruction state when the driving timing changes from the first phase to the second phase, or from the second phase to the first phase.

[0049] In some embodiments, by monitoring the driving timing of the display driving signal, when it is determined that the display driving signal is in a phase stable state, that is, when the display driving signal maintains a high level phase or a low level phase unchanged, the electromagnetic handwriting processing timing is changed to an electromagnetic handwriting receiving timing, and the electromagnetic handwriting sensing signal is received and processed. Exemplarily, the display driving signal can be HSYNC (line synchronization signal) or VSYNC (frame synchronization signal). When the display driving signal changes from a low level phase to a high level phase, or from a high level phase to a low level phase, it can be determined that the display driving signal is in a phase change state, indicating that the display driving module is in operation. In the working state, the interference caused by the display driving signal is relatively large. At this time, the reception and processing of the electromagnetic handwriting induction signal is performed, which may easily cause abnormal conditions such as handwriting display coordinate offset to appear in the display content on the display driving module. When the display driving signal maintains a high-level phase or a low-level phase unchanged, it can be determined that the display driving signal is in a phase-stable state, indicating that the display driving module is in a stable state. In the stable state, the interference caused by the display driving signal is very small. Electromagnetic reception processing is performed in the stable state. The display content on the display driving module is consistent with the handwriting content of the electromagnetic pen, and the handwriting display coordinates are stable, without abnormal conditions such as jumping and deflection.

[0050] Reference Figure 2 , Figure 2 It is a timing diagram of electromagnetic handwriting processing timing without synchronous multi-tasking processing in the prior art, wherein V_SYNC_Period is the driving timing of the display driving signal VSYNC (frame synchronization signal), H_SYNC_Period is the driving timing of the display driving signal HSYNC (line synchronization signal), and EMR_RX_Period is the electromagnetic handwriting processing timing. When VSYNC in V_SYNC_Period changes from a low level phase to a high level phase or from a high level phase to a low level phase, or HSYNC in H_SYNC_Period changes from a low level phase to a high level phase or from a high level phase to a low level phase, the electromagnetic handwriting processing timing in EMR_RX_Period will not change synchronously, and will still change according to the original timing change. The receiving processing of the electromagnetic handwriting sensing signal is not affected by the phase change of the display driving signal VSYNC or the display driving signal HSYNC.

[0051] Reference Figure 3 , Figure 3It is a timing diagram of the electromagnetic handwriting processing timing in the embodiment of the present application, wherein, when VSYNC in V_SYNC_Period changes from a low level phase to a high level phase or from a high level phase to a low level phase, or HSYNC in H_SYNC_Period changes from a low level phase to a high level phase or from a high level phase to a low level phase, synchronous multi-tasking is performed, and the electromagnetic handwriting processing timing in EMR_RX_Period will change synchronously to the electromagnetic handwriting non-reception timing, and the reception processing of the electromagnetic handwriting sensing signal is stopped at this time.

[0052] When VSYNC in V_SYNC_Period maintains a low level phase or a high level phase unchanged, and HSYNC in H_SYNC_Period also maintains a low level phase or a high level phase unchanged, the electromagnetic handwriting processing timing is changed to the electromagnetic handwriting receiving timing, and the electromagnetic handwriting sensing signal can be received and related signal processing can be performed.

[0053] In some embodiments, the apparatus further comprises a data multiplexer.

[0054] The data multiplexer is connected to the antenna module, and is used to receive control instructions, switch and control the signal receiving and sending paths according to the control instructions, transmit the control instructions to the antenna module, and receive the electromagnetic handwriting induction signal returned by the antenna module.

[0055] Optionally, when the data multiplexer receives a control instruction and the instruction state of the control instruction is the above-mentioned first instruction state, the signal sending path is opened and the control instruction is transmitted to the data multiplexer. Then, the signal receiving path is opened. After the data multiplexer receives the electromagnetic handwriting sensing signal returned by the antenna module, the electromagnetic handwriting sensing signal is transmitted to the electromagnetic handwriting signal processing module for signal processing.

[0056] When the data multiplexer receives a control instruction and the instruction state of the control instruction is the second instruction state, the signal sending path and the signal receiving path are closed, and the control instruction is not transmitted to the antenna module.

[0057] In some embodiments, the antenna module includes an antenna coil; the antenna coil is connected to a data multiplexer, used to receive control instructions and send an excitation signal to the outside; the antenna coil is connected to the data multiplexer, used to receive an electromagnetic handwriting induction signal, and transmit the electromagnetic handwriting induction signal to the data multiplexer, the electromagnetic handwriting induction signal is an induction signal generated by an electromagnetic handwriting operation in response to the above-mentioned excitation signal, and the electromagnetic handwriting operation is a handwriting operation performed on an electromagnetic handwriting board using an electromagnetic pen.

[0058] Optionally, the antenna coil includes a horizontal coil and a vertical coil, and both the horizontal coil and the vertical coil have functions of signal receiving and signal sending.

[0059] In some embodiments, after receiving the electromagnetic handwriting sensing signal, the data multiplexer transmits the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module for signal noise reduction processing.

[0060] In some embodiments, the electromagnetic handwriting signal processing module includes an electromagnetic handwriting signal processor, a signal amplifier, a bandpass filter, a synchronous detector, a low-pass filter, a sample-and-hold integrator, and a digital-to-analog converter.

[0061] In some embodiments, the signal noise reduction process is performed by the signal amplifier, the bandpass filter, the synchronous detector, the low-pass filter, the sample-and-hold integrator, and the digital-to-analog converter.

[0062] Specifically, the signal amplifier is connected to the data multiplexer through a transceiver switching switch, receives the electromagnetic handwriting sensing signal, amplifies the electromagnetic handwriting sensing signal, and obtains an amplified signal.

[0063] The bandpass filter receives the amplified signal, filters irrelevant frequency segments in the amplified signal, retains required frequency segments, and filters out unnecessary frequency segments to obtain a first filtered signal.

[0064] The synchronous detector receives the first filtered signal, and extracts a specified frequency segment in the first filtered signal through a signal phase-locking function to obtain a second filtered signal.

[0065] The low-pass filter receives the second filtered signal, filters out the AC signal in the second filtered signal, retains the DC signal in the second filtered signal, and obtains a third filtered signal.

[0066] The sample-and-hold integrator receives the third filtered signal and integrates the third filtered signal, that is, integrates a specific signal segment of the DC signal in the second filtered signal to obtain an integrated signal.

[0067] The digital-to-analog converter performs digital-to-analog conversion on the integrated signal to obtain a digital signal, and transmits the digital signal to the electromagnetic handwriting signal processor.

[0068] In some embodiments, the electromagnetic handwriting signal processor is used to analyze the digital signal, obtain electromagnetic handwriting information, and transmit the electromagnetic handwriting information to the display driving module. The electromagnetic handwriting information includes handwriting coordinate information and handwriting pressure information.

[0069] The display driving module is used for performing synchronous display in response to the electromagnetic handwriting operation according to the electromagnetic handwriting information.

[0070] Specifically, the display driving module includes a display screen and a screen driving board. The screen driving board is used to respond to the electromagnetic handwriting operation, synchronously receive the corresponding electromagnetic handwriting information, and control the display screen to synchronously display the corresponding electromagnetic handwriting information.

[0071] Reference Figure 4 , Figure 4 1 is another optional structural diagram of an electromagnetic handwriting display control device provided in an embodiment of the present application, which includes an antenna module, a signal amplifier, a bandpass filter, a synchronous detector, a low-pass filter, a sample-and-hold integrator, a digital-to-analog converter, an electromagnetic handwriting signal processor, a data multiplexer, and a display driver module (including a screen driver and a liquid crystal display screen). The display driver module transmits the display drive signal to the electromagnetic handwriting signal processing module. The electromagnetic handwriting signal processor generates a control instruction 2 according to the display drive signal 1, changes the electromagnetic handwriting processing timing according to the control instruction 2, and transmits the control instruction 2 to the data multiplexer. The data multiplexer controls Instruction 2 is transmitted to the antenna module. When the electromagnetic processing sequence is the electromagnetic handwriting receiving sequence, the antenna module returns the electromagnetic handwriting sensing signal 3 to the data multiplexer and then transmits it to the signal noise reduction processing module group composed of a signal amplifier, a bandpass filter, a synchronous detector, a low-pass filter, a sample-and-hold integrator, and a digital-to-analog converter for signal noise reduction processing. The digital signal 4 after noise reduction processing is then transmitted to the electromagnetic handwriting signal processor for analysis. The electromagnetic handwriting signal processor transmits the electromagnetic handwriting information 5 obtained after analysis to the display driver module. The display driver module performs synchronous display in response to the electromagnetic handwriting operation on the display screen according to the electromagnetic handwriting information 5.

[0072] An embodiment of the present application provides an electromagnetic handwriting device, which includes an electromagnetic pen and the electromagnetic handwriting display control device.

[0073] An embodiment of the present application further provides an electronic device, which includes the above-mentioned electromagnetic handwriting device. The electronic device can be any intelligent terminal such as an electronic reader, a tablet computer, and a car computer.

[0074] The embodiments of the present application provide an electromagnetic handwriting display control device, an electromagnetic handwriting device, and an electronic device, which generate control instructions according to display drive signals through an electromagnetic handwriting signal processing module, perform electromagnetic handwriting sensing signal processing according to the control instructions, and the antenna module controls the return of the electromagnetic handwriting sensing signal according to the control instructions. The present application can realize reasonable electromagnetic handwriting sensing signal return processing according to the display drive signal to complete the electromagnetic handwriting display, avoid the excitation magnetic field interference of the display drive signal, improve the stability of the electromagnetic handwriting coordinates, prevent the electromagnetic handwriting coordinates from changing, and greatly improve the user experience.

[0075] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0076] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0077] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the rights of the present application is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application should be within the scope of the rights of the present application.

Claims

1. An electromagnetic handwriting display control device, characterized in that: It includes a display driver module, an electromagnetic handwriting signal processing module and an antenna module; The display driving module is connected to the electromagnetic handwriting signal processing module and is used to transmit a display driving signal to the electromagnetic handwriting signal processing module; The electromagnetic handwriting signal processing module is used to receive the display driving signal, synchronously generate a control instruction according to the display driving signal, and perform electromagnetic handwriting sensing signal processing according to the control instruction; The antenna module is connected to the electromagnetic handwriting signal processing module, and is used to receive the control instruction, and determine whether to return the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module according to the control instruction; The electromagnetic handwriting signal processing module is used to monitor the driving timing of the display driving signal, synchronously generate a control instruction according to the display driving signal and determine the instruction state of the control instruction; The instruction state is a first instruction state or a second instruction state; the first instruction state corresponds to a phase stable state of the display driving signal; the second instruction state corresponds to a phase change state of the display driving signal; The electromagnetic handwriting signal processing module is used for determining the electromagnetic handwriting processing sequence as the electromagnetic handwriting receiving sequence and performing the electromagnetic handwriting sensing signal processing when the instruction state is the first instruction state; The electromagnetic handwriting signal processing module is further used to determine that the electromagnetic handwriting processing sequence is an electromagnetic handwriting non-receiving sequence and stop the electromagnetic handwriting sensing signal processing when the instruction state is the second instruction state.

2. The electromagnetic handwriting display control device according to claim 1, characterized in that: The electromagnetic handwriting signal processing module is used for synchronously generating the control instruction and determining that the instruction state is the first instruction state when the display driving signal is in the first phase or the second phase; The electromagnetic handwriting signal processing module is also used to synchronously generate the control instruction and determine that the instruction state is the second instruction state when the display driving signal changes from the first phase to the second phase, or changes from the second phase to the first phase.

3. The electromagnetic handwriting display control device according to claim 1, characterized in that: The device also includes a data multiplexer; The data multiplexer is connected to the antenna module, and is used to receive the control instruction, switch and control the signal receiving and sending path according to the control instruction, transmit the control instruction to the antenna module, and receive the electromagnetic handwriting induction signal returned by the antenna module.

4. The electromagnetic handwriting display control device according to claim 3, characterized in that: The antenna module includes an antenna coil; The antenna coil is connected to the data multiplexer and is used to send an excitation signal outwardly; The antenna coil is connected to the data multiplexer, and is used to receive the electromagnetic handwriting induction signal, and transmit the electromagnetic handwriting induction signal to the data multiplexer; the electromagnetic handwriting induction signal is an induction signal generated by performing an electromagnetic handwriting operation in response to the excitation signal; The data multiplexer is also used to transmit the electromagnetic handwriting sensing signal to the electromagnetic handwriting signal processing module for signal noise reduction processing.

5. The electromagnetic handwriting display control device according to any one of claims 1 to 4, characterized in that: The electromagnetic handwriting signal processing module also includes a signal amplifier, a bandpass filter, a synchronous detector, a low-pass filter, a sample-and-hold integrator, a digital-to-analog converter and an electromagnetic handwriting signal processor; The signal amplifier is connected to the data multiplexer via a transceiver switch, and is used to receive the electromagnetic handwriting sensing signal, amplify the electromagnetic handwriting sensing signal, and obtain an amplified signal; The bandpass filter is used to receive the amplified signal, filter irrelevant frequency segments in the amplified signal, and obtain a first filtered signal; The synchronous detector is used to receive the first filtered signal, extract the frequency segment specified in the first filtered signal, and obtain the second filtered signal; The low-pass filter is used to receive the second filtered signal, filter out the AC signal in the second filtered signal, and obtain a third filtered signal; The sample-and-hold integrator is used to receive the third filtered signal, integrate the third filtered signal, and obtain an integrated signal; The digital-to-analog converter is used to perform digital-to-analog conversion on the integrated signal to obtain a digital signal, and transmit the digital signal to the electromagnetic handwriting signal processor.

6. The electromagnetic handwriting display control device according to claim 5, characterized in that: The electromagnetic handwriting signal processor is used to analyze the digital signal, obtain electromagnetic handwriting information, and transmit the electromagnetic handwriting information to the display driving module; the electromagnetic handwriting information includes handwriting coordinate information and handwriting pressure information; The display driving module is used for performing synchronous display in response to the electromagnetic handwriting operation according to the electromagnetic handwriting information.

7. The electromagnetic handwriting display control device according to claim 6, characterized in that: The display driving module includes a display screen and a screen driving board; the screen driving board is used to respond to the electromagnetic handwriting operation, synchronously receive the corresponding electromagnetic handwriting information, and control the display screen to synchronously display the electromagnetic handwriting information.

8. An electromagnetic handwriting device, characterized in that: The electromagnetic handwriting device comprises an electromagnetic pen and the electromagnetic handwriting display control device according to any one of claims 1 to 7.

9. An electronic device, characterized in that: The electronic device comprises the electromagnetic handwriting device according to claim 8.

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