Teaching screen based on capacitance and electromagnetic touch control and electronic device

Abstract

The invention provides a teaching screen based on capacitance and electromagnetic touch control and an electronic device, and relates to the field of intelligent teaching multimedia equipment. The teaching screen comprises an LCD display screen; the capacitive touch control layer is arranged on the upper surface of the LCD display screen, has light transmittance and is used for sensing capacitance change generated by a touch control point to generate a first pressure sensing signal; the electromagnetic touch layer is arranged on the lower surface of the LCD display screen and is used for generating a second pressure sensing signal by detecting electromagnetic change caused by eddy current generated by a touch point; and the control unit is electrically connected with the LCD display screen, the capacitance touch control layer and the electromagnetic touch control layer, and is used for receiving, fusing and processing the first pressure sensing signal and the second pressure sensing signal, generating a fused touch control signal, and performing operation control on a display picture of the LCD display screen according to the fused touch control signal. According to the technical scheme, the writing experience and the touch operation accuracy and stability of the touch teaching screen can be comprehensively improved.

Description

Technical Field

[0001] This application relates to the field of intelligent teaching multimedia devices. Specifically, it relates to a teaching screen and an electronic device based on capacitance and electromagnetic touch control. Background Art

[0002] With the rapid development of information technology, teaching equipment is also constantly being upgraded. Among them, touch teaching screens have become an essential and important tool in modern teaching. With its intuitive and highly interactive features, it has greatly improved the teaching effect and learning experience. The touch teaching screen realizes precise control of the display screen by sensing the touch operations of users, making teaching activities more vivid and interesting.

[0003] Currently, the touch teaching screens mainly used are single-screen capacitive teaching screens. Although such teaching screens have made certain progress in screen display and touch technology, there are still many deficiencies in the actual teaching process. First of all, the single capacitive touch function is relatively single and it is difficult to fully meet the requirements for complex screen control and fine writing in the teaching process. Especially in the scenario of writing on an electronic whiteboard, single capacitive teaching screens often have difficulty in accurately capturing and restoring the subtle changes of the pen strokes, such as the flow of the pen tip and the difference in strength, thus affecting the natural smoothness of writing and the teaching experience. In addition, single capacitive teaching screens also have shortcomings in touch signal processing. Facing complex and changeable touch environments and signal quality fluctuations, such teaching screens often lack sufficient flexibility and adaptability, and it is difficult to ensure the stability and accuracy of touch operations. This not only affects the consistency of the touch experience, but also to a certain extent limits the wide application and in-depth integration of touch teaching screens in teaching activities.

[0004] In view of the above problems, how to effectively improve the writing experience of touch teaching screens while enhancing the accuracy and stability of touch operations has become a technical problem that urgently needs to be solved at present. Summary of the Invention

[0005] To solve the above problems, this application provides a teaching screen and an electronic device based on capacitance and electromagnetic touch control, which can comprehensively improve the writing experience, accuracy, and stability of touch operations of the touch teaching screen.

[0006] This application is implemented as follows:

[0007] In a first aspect, the present application provides a teaching screen based on capacitance and electromagnetic touch, which includes: an LCD display screen; a capacitive touch layer disposed on the upper surface of the LCD display screen, having light transmissibility, and configured to sense capacitance changes generated by touch points to generate a first pressure sensing signal; an electromagnetic touch layer disposed on the lower surface of the LCD display screen, and configured to generate a second pressure sensing signal by detecting electromagnetic changes caused by eddy currents generated by touch points; a control unit electrically connected to the LCD display screen, the capacitive touch layer, and the electromagnetic touch layer, and configured to receive and fuse and process the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal, and perform operation control on the display screen of the LCD display screen according to the fused touch signal.

[0008] In some implementation manners of the present application, the fusion processing adopts a weighted average algorithm, which respectively assigns corresponding weights according to the reliability and importance of the first pressure sensing signal and the second pressure sensing signal.

[0009] In some implementation manners of the present application, the weights of the first pressure sensing signal and the second pressure sensing signal are dynamically adjusted according to the touch environment and signal quality.

[0010] In some implementation manners of the present application, the control unit is further configured to dynamically adjust the weights of the first pressure sensing signal and the second pressure sensing signal according to user feedback and system performance evaluation.

[0011] In some implementation manners of the present application, the control unit is further configured to calibrate the weighted average algorithm adopted for the fusion processing according to actual touch tests.

[0012] In some implementation manners of the present application, the receiving and fusing and processing the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal includes: preprocessing the received first pressure sensing signal and second pressure sensing signal; extracting features from the preprocessed first pressure sensing signal to obtain a first feature vector, and extracting features from the preprocessed second pressure sensing signal to obtain a second feature vector; adopting a weighted average algorithm to fuse and process the first feature vector and the second feature vector to obtain a fused feature vector; using the fused feature vector to perform position calculation to obtain the position information of the touch point, and generating a fused touch signal according to the position information.

[0013] In some implementation manners of the present application, the preprocessing includes applying a digital filter to remove high-frequency and low-frequency interference in the first pressure sensing signal and the second pressure sensing signal, and performing normalization processing after removing the DC offset.

[0014] In some implementations of the present application, the electromagnetic touch layer is disposed inside the backlight module of the LCD display screen, integrated with the LCD display screen, and the electromagnetic induction coil of the electromagnetic touch layer is located below the LCD display screen, while the capacitive sensing electrodes of the capacitive touch layer are located above the LCD display screen.

[0015] In some implementations of the present application, the capacitive touch layer adopts a projected capacitive screen structure, having two ITO conductive layers as electrodes, and determining the position of the touch point by measuring the change in the capacitance of the capacitor.

[0016] In a second aspect, the present application provides an electronic device with a teaching screen based on capacitive and electromagnetic touch, which includes: a housing having at least one display opening; a capacitive touch layer having light transmissivity, disposed at the display opening for sensing the capacitance change generated by a touch point to generate a first pressure sensing signal; an LCD display screen disposed on the other side of the capacitive touch layer relative to the display opening; an electromagnetic touch layer disposed on the lower surface of the LCD display screen for generating a second pressure sensing signal by detecting the electromagnetic change caused by the eddy current generated by the touch point; and a control unit electrically connected to the LCD display screen, the capacitive touch layer, and the electromagnetic touch layer, for receiving and integrally processing the first pressure sensing signal and the second pressure sensing signal, generating an integrated touch signal, and performing operation control on the display screen of the LCD display screen according to the integrated touch signal.

[0017] Compared with the prior art, the present application has at least the following advantages or beneficial effects:

[0018] The present application provides a teaching screen based on capacitive and electromagnetic touch. By disposing a capacitive touch layer with light transmissivity on the upper surface of the LCD display screen, it is used to sense the capacitance change generated by the touch point and generate a first pressure sensing signal. This design retains the advantages of high sensitivity and fast response speed of capacitive touch technology, while ensuring the visual intuitiveness and clarity of touch operations. Then, an electromagnetic touch layer is additionally provided on the lower surface of the LCD display screen to generate a second pressure sensing signal by detecting the electromagnetic change caused by the eddy current generated by the touch point. The introduction of electromagnetic touch technology enables the teaching screen to accurately capture and restore the subtle changes of the pen stroke, such as the flow of the pen tip and the difference in strength, thereby greatly improving the natural smoothness of the writing experience. The control unit can ensure the stability and accuracy of touch operations and improve the consistency of the touch experience by integrally processing the first pressure sensing signal and the second pressure sensing signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of an electronic device of a teaching screen with capacitance and electromagnetic touch in the present application;

[0021] Figure 2 It is a schematic flowchart of the steps of receiving, fusing and processing the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal in an embodiment of the present application.

[0022] Icons: 10. Capacitive touch layer; 20. LCD display screen; 30. Electromagnetic touch layer; 40. Housing. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0025] Embodiment:

[0026] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following various embodiments and the various features in the embodiments can be combined with each other.

[0027] Today, with the rapid development of information technology, teaching equipment is undergoing profound changes. As a key tool for modern teaching, the improvement of the performance and experience of the touch teaching screen is crucial for enhancing the teaching effect and learning quality. However, the problems exposed by the existing single-screen capacitive teaching screen in practical applications, such as single function and insufficient touch signal processing, seriously restrict the further development and application of the touch teaching screen.

[0028] After in-depth analysis of the prior art, the inventors found that although the single-capacitive touch technology meets the teaching needs to a certain extent, there are obvious shortcomings in complex control and fine writing. Especially in the scenario of writing on an electronic whiteboard, the subtle changes in the writing stroke are difficult to accurately capture and restore, resulting in a significant reduction in the writing experience. At the same time, the deficiencies in touch signal processing also affect the stability and accuracy of touch operations, further restricting the wide application and in-depth integration of touch teaching screens.

[0029] In view of the above-mentioned shortcomings of the prior art, the embodiments of the present application provide a teaching screen based on capacitive and electromagnetic touch, which combines capacitive touch and electromagnetic touch technologies to comprehensively improve the writing experience, accuracy, and stability of touch operations of the touch teaching screen.

[0030] Please refer to Figure 1 , the teaching screen based on capacitive and electromagnetic touch includes: an LCD display screen 20; a capacitive touch layer 10, disposed on the upper surface of the LCD display screen 20, having light transmissivity, and used to sense the capacitance change generated by a touch point to generate a first pressure sensing signal; an electromagnetic touch layer 30, disposed on the lower surface of the LCD display screen 20, and used to generate a second pressure sensing signal by detecting the electromagnetic change caused by the eddy current generated by the touch point; a control unit, electrically connected to the LCD display screen 20, the capacitive touch layer 10, and the electromagnetic touch layer 30, and used to receive and fuse the first pressure sensing signal and the second pressure sensing signal, generate a fused touch signal, and perform operation control on the display screen of the LCD display screen 20 according to the fused touch signal.

[0031] In the above embodiment, the LCD display screen 20 undertakes the task of displaying the screen and also serves as a carrier for the capacitive touch layer 10 and the electromagnetic touch layer 30, providing a necessary interface for touch operations. As the core component for displaying the screen, the LCD display screen 20 can provide clear and delicate visual effects, providing a good visual foundation for teaching activities.

[0032] Among them, the capacitive touch layer 10 is disposed on the upper surface of the LCD display screen 20. This layer has light transmittance and can sense the capacitance change generated by the touch point. When a finger or other conductive object touches the touch point, it will change the capacitance value near this point, thereby generating a first pressure sensing signal. With its characteristics of high sensitivity and fast response speed, the capacitive touch layer 10 provides a smooth touch experience for the teaching screen. The electromagnetic touch layer 30 is disposed on the lower surface of the LCD display screen 20. This layer generates a second pressure sensing signal by detecting the electromagnetic change caused by the eddy current generated at the touch point. When a conductive pen or a magnetic touch tool touches the touch point, an eddy current will be generated in the electromagnetic touch layer 30, which will in turn cause a change in the electromagnetic field. The electromagnetic touch layer 30 realizes accurate recognition of the touch operation by detecting these electromagnetic changes. This enables the electromagnetic touch layer 30 to accurately capture the subtle changes of the writing brushstroke, such as the rotation of the pen tip and the difference in strength, thereby greatly improving the natural smoothness of the writing experience. At the same time, the electromagnetic touch technology also has the advantages of strong anti-interference ability and high positioning accuracy, further enhancing the stability and accuracy of the touch operation.

[0033] In addition, the control unit is responsible for receiving and fusing the pressure sensing signals from the capacitive touch layer 10 and the electromagnetic touch layer 30 to generate a fused touch signal. Then, according to this fused touch signal, the display screen of the LCD display screen 20 is operationally controlled to achieve accurate response and screen update of the touch operation. This fusion processing strategy ensures the accuracy and stability of the touch operation, avoiding the errors and unstable factors that may be brought by a single touch technology. At the same time, its efficient signal processing ability makes the teaching screen more rapid in response speed, improving the user's interaction experience.

[0034] In summary, in the above embodiments, by disposing the capacitive touch layer 10 with light transmittance on the upper surface of the LCD display screen 20, it is used to sense the capacitance change generated by the touch point and generate a first pressure sensing signal. This design retains the advantages of high sensitivity and fast response speed of the capacitive touch technology, while ensuring the visual intuitiveness and clarity of the touch operation. Then, an electromagnetic touch layer 30 is added to the lower surface of the LCD display screen 20, and a second pressure sensing signal is generated by detecting the electromagnetic change caused by the eddy current generated at the touch point. The introduction of the electromagnetic touch technology enables the teaching screen to accurately capture and restore the subtle changes of the writing brushstroke, such as the rotation of the pen tip and the difference in strength, thereby greatly improving the natural smoothness of the writing experience. The control unit can ensure the stability and accuracy of the touch operation, and at the same time improve the consistency of the touch experience by receiving and fusing the first pressure sensing signal and the second pressure sensing signal.

[0035] In some implementation manners of the present application, the fusion processing adopts a weighted average algorithm, which respectively assigns corresponding weights according to the reliability and importance of the first pressure sensing signal and the second pressure sensing signal.

[0036] It should be noted that by performing fusion processing on the first pressure-sensitive signal and the second pressure-sensitive signal through a weighted average algorithm, the advantages of the two touch methods can be fully utilized to improve the touch accuracy. Especially in complex touch scenarios, the weighted average algorithm can more effectively handle the fluctuations and interferences of touch signals, thereby improving the touch accuracy. Moreover, by assigning different weights to different touch signals, the weighted average algorithm can adjust the response characteristics of the teaching screen based on capacitance and electromagnetic touch according to the actual situation. This helps to enhance the stability of the teaching screen based on capacitance and electromagnetic touch, enabling it to perform excellently in the face of different touch requirements.

[0037] Exemplarily, if the capacitive touch layer 10 exhibits higher accuracy or stability in a certain touch scenario, then the corresponding first pressure-sensitive signal will be assigned a higher weight. Conversely, if the electromagnetic touch layer 30 is more reliable in another scenario, then the corresponding second pressure-sensitive signal will be assigned a higher weight. After determining the weights, the weighted average algorithm performs weighted averaging on the first pressure-sensitive signal and the second pressure-sensitive signal according to their respective weights, thereby generating a fused touch signal. This signal combines the advantages of the two touch methods and can provide more accurate and reliable touch information.

[0038] In some implementation manners of the present application, the weights of the first pressure-sensitive signal and the second pressure-sensitive signal are dynamically adjusted according to the touch environment and signal quality.

[0039] In the above implementation manner, a dynamic weight adjustment mechanism is introduced, that is, the weights of the first pressure-sensitive signal and the second pressure-sensitive signal are adjusted in real time according to the touch environment and signal quality. This can further improve the accuracy and response speed of touch interaction to adapt to more complex and changeable touch scenarios.

[0040] Exemplarily, sensors or algorithms can be built into the teaching screen to real-time sense the current touch environment, such as light intensity, temperature, humidity, etc. These environmental factors may affect the stability and accuracy of touch signals, so the touch performance can be optimized by dynamically adjusting the weights. It is also possible to analyze the quality of the first pressure-sensitive signal and the second pressure-sensitive signal in real time, including signal strength, stability, noise level, etc. The results of these signal quality evaluations can also be used as the basis for weight adjustment. Thus, in a stable touch environment with high signal quality, a higher weight can be given to the capacitive touch layer 10 or the electromagnetic touch layer 30 to give full play to their advantages; while in a complex touch environment with low signal quality, the weight of the corresponding touch layer can be appropriately reduced to reduce interference and errors.

[0041] In some implementation manners of the present application, the control unit is further configured to dynamically adjust the weights of the first pressure-sensitive signal and the second pressure-sensitive signal according to user feedback and system performance evaluation.

[0042] In the above implementation, through user feedback, the preferences and needs of users can be understood, so as to provide a more personalized touch experience. For example, for users who pay attention to touch accuracy, a higher weight can be given to the capacitive touch layer 10; for users who pursue fast response, the weight of the electromagnetic touch layer 30 can be increased. In addition, the adjustment of the weight can be guided by the system performance evaluation results to ensure that the system maintains the best performance in a complex and changing touch environment. For example, when it is detected that the stability of the touch signal decreases, the weight can be automatically adjusted to reduce interference and errors.

[0043] Exemplarily, the feedback of users on touch interaction can be collected through an integrated user interface or an external device (such as a remote control, a mobile device, etc.). The user feedback can include subjective evaluations in aspects such as touch accuracy, response speed, and touch smoothness, as well as specific problems and suggestions of users during the use process. At the same time, the system performance of the teaching screen can be evaluated regularly or on demand, including objective indicators such as the stability of the touch signal, the noise level, and the processing speed. The evaluation results will be used to judge whether the current weight allocation is optimal and whether adjustment is needed to optimize the system performance. Thus, by balancing touch accuracy, response speed, and user experience, it is ensured that the teaching screen can perform excellently under different scenarios and user needs.

[0044] In some implementations of the present application, the control unit is further configured to calibrate the weighted average algorithm adopted for fusion processing according to an actual touch test.

[0045] It should be noted that during the production or debugging stage of the teaching screen, actual touch tests can be carried out by simulating various touch scenarios and user behaviors. The test data includes key indicators such as touch position, touch force, and touch speed, as well as user feedback and system performance evaluation results. The control unit will calibrate the weighted average algorithm according to the results of the actual touch test. The calibration process includes adjusting the weight allocation, optimizing algorithm parameters, etc., to ensure that the weighted average algorithm can more accurately fuse the first pressure-sensitive signal and the second pressure-sensitive signal. The calibrated algorithm will better adapt to different touch scenarios and user behaviors, and improve the accuracy and response speed of touch interaction.

[0046] Please refer to Figure 2, in some implementations of the present application, the receiving and fusing the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal includes: preprocessing the received first pressure sensing signal and second pressure sensing signal; extracting features from the preprocessed first pressure sensing signal to obtain a first feature vector, and extracting features from the preprocessed second pressure sensing signal to obtain a second feature vector; using a weighted average algorithm to fuse the first feature vector and the second feature vector to obtain a fused feature vector; using the fused feature vector for position calculation to obtain the position information of the touch point, and generating a fused touch signal according to the position information.

[0047] In the above implementation, the specific process of receiving and fusing the first pressure sensing signal (from the capacitive touch layer 10) and the second pressure sensing signal (from the electromagnetic touch layer 30) to generate a fused touch signal mainly includes key steps such as signal preprocessing, feature extraction, weighted average fusion, and position calculation. Among them, the signal preprocessing step is to preprocess the received first pressure sensing signal and second pressure sensing signal to remove noise, interference, and outliers, and improve the reliability and accuracy of the signal. The feature extraction step is to extract key features from the preprocessed first pressure sensing signal and second pressure sensing signal for subsequent fusion processing and position calculation. The weighted average fusion step is to use a weighted average algorithm to fuse the first feature vector and the second feature vector to obtain a fused feature vector. The position calculation step is to use the fused feature vector for position calculation to obtain the position information of the touch point. Thus, according to the position information of the touch point, a fused touch signal is generated.

[0048] In summary, through signal preprocessing and feature extraction, noise and interference can be removed, and accurate key features can be extracted, thereby improving the accuracy and reliability of the touch signal and providing a smoother and more natural touch experience for the user.

[0049] In some implementations of the present application, the preprocessing includes applying a digital filter to remove high-frequency and low-frequency interference in the first pressure sensing signal and the second pressure sensing signal, and performing normalization processing after removing the DC offset.

[0050] In the above implementation, by removing high-frequency and low-frequency interference and DC offset, the preprocessing step significantly improves the quality of the first pressure sensing signal and the second pressure sensing signal, and reduces the influence of noise and interference on subsequent processing. Because the preprocessed signal is smoother, more stable, and more uniform, it can provide better input data for subsequent steps such as feature extraction, weighted average fusion, and position calculation, which helps to improve the accuracy and performance of the overall touch interaction.

[0051] In some implementations of the present application, the electromagnetic touch layer 30 is disposed inside the backlight module of the LCD display screen 20, integrated with the LCD display screen 20 as a whole, and the electromagnetic induction coil of the electromagnetic touch layer 30 is located below the LCD display screen 20, while the capacitive sensing electrodes of the capacitive touch layer 10 are located above the LCD display screen 20.

[0052] In the above implementation, the electromagnetic touch layer 30 is disposed inside the backlight module of the LCD display screen 20 and tightly integrated with the backlight module. This design not only reduces the space occupied between the electromagnetic touch layer 30 and the LCD display screen 20, but also reduces the complexity of the overall structure, improving the integration and aesthetics of the teaching screen. The electromagnetic induction coil of the electromagnetic touch layer 30 is located below the LCD display screen 20, that is, between the backlight module and the LCD panel. This layout enables the electromagnetic induction coil to efficiently receive electromagnetic signals from touch tools such as styluses or fingers, while avoiding direct interference with the upper capacitive touch layer 10. The capacitive sensing electrodes of the capacitive touch layer 10 are located above the LCD display screen 20, that is, between the LCD display screen 20 and the user interface. This layout enables the capacitive sensing electrodes to directly contact the user's fingers or touch tools, thereby accurately capturing information such as the touch position and force.

[0053] In summary, in the above implementation, the combination of the electromagnetic touch layer 30 and the backlight module of the LCD display screen 20 realizes the integrated integration of the touch layer and the display screen. At the same time, through reasonable layout design, interference between the electromagnetic touch layer 30 and the capacitive touch layer 10 is avoided, improving touch accuracy and user experience. This design not only optimizes the touch interaction performance, but also reduces the manufacturing cost and complexity, providing new ideas and methods for the innovation and development of teaching screen technology.

[0054] In some implementations of the present application, the capacitive touch layer 10 adopts a projected capacitive screen structure, having two ITO conductive layers as electrodes, and determining the position of the touch point by measuring the change in the capacitance of the capacitor. This structure not only has the advantages of high sensitivity, fast response, and multi-touch, but also has good durability and stability.

[0055] It should be noted that the working principle of a projective capacitive touch screen is to determine the position of the touch point by measuring the change in the capacitance of a capacitor. When a finger or other conductive object touches the surface of the touch screen, it will change the capacitance distribution on the sensing layer. Among them, the structure of the projective capacitive touch screen has two ITO (indium tin oxide) conductive layers as electrodes. These conductive layers are coated on a transparent substrate, such as glass or PET (polyethylene terephthalate), etc., to form the sensing area of the touch screen. The first ITO conductive layer serves as the driving layer, which is used to generate an electric field and drive the capacitance change. During the scanning process, this layer will be activated in sequence to generate a changing electric field. The second ITO conductive layer serves as the receiving layer, which is used to detect the change in capacitance. When a finger touches the screen, this layer will capture the capacitance change caused by the finger and convert it into an electrical signal to be transmitted to the control system.

[0056] Please refer to Figure 1 , an embodiment of the present application further provides a teaching screen and an electronic device based on capacitance and electromagnetic touch, which includes: a housing 40 having at least one display opening; a capacitive touch layer 10 having light transmittance, disposed at the display opening, and used to sense the capacitance change generated by the touch point to generate a first pressure sensing signal; an LCD display screen 20 disposed on the other side of the capacitive touch layer 10 relative to the display opening; an electromagnetic touch layer 30 disposed on the lower surface of the LCD display screen 20, and used to generate a second pressure sensing signal by detecting the electromagnetic change caused by the eddy current generated by the touch point; a control unit electrically connected to the LCD display screen 20, the capacitive touch layer 10, and the electromagnetic touch layer 30, and used to receive and fuse and process the first pressure sensing signal and the second pressure sensing signal, generate a fused touch signal, and perform operation control on the display screen of the LCD display screen 20 according to the fused touch signal.

[0057] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A teaching screen based on capacitance and electromagnetic touch, characterized in that: include: LCD display; The capacitive touch layer is disposed on the upper surface of the LCD display screen, has light transmittance, and is used to sense the capacitance change generated by the touch point to generate a first pressure sensing signal; The electromagnetic touch layer is disposed on the lower surface of the LCD display screen and is used to generate a second pressure-sensing signal by detecting electromagnetic changes caused by eddy currents generated at the touch point; The control unit is electrically connected to the LCD display screen, the capacitive touch layer and the electromagnetic touch layer, and is used to receive and fuse the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal, and perform operation control on the display screen of the LCD display screen according to the fused touch signal.

2. A teaching screen based on capacitance and electromagnetic touch according to claim 1, characterized in that: The fusion process adopts a weighted average algorithm, which allocates corresponding weights according to the reliability and importance of the first pressure-sensing signal and the second pressure-sensing signal.

3. The teaching screen based on capacitance and electromagnetic touch according to claim 2, characterized in that: The weights of the first pressure-sensing signal and the second pressure-sensing signal are dynamically adjusted according to the touch control environment and the signal quality.

4. The teaching screen based on capacitance and electromagnetic touch according to claim 2, characterized in that: The control unit is further configured to dynamically adjust the weights of the first pressure sensing signal and the second pressure sensing signal according to user feedback and system performance evaluation.

5. The teaching screen based on capacitance and electromagnetic touch according to claim 2, characterized in that: The control unit is further used to calibrate the weighted average algorithm used in the fusion process according to actual touch test.

6. The teaching screen based on capacitance and electromagnetic touch according to claim 1, characterized in that: The receiving and fusing the first pressure-sensing signal and the second pressure-sensing signal to generate a fused touch signal includes: Preprocessing the received first pressure-sensing signal and the second pressure-sensing signal; Performing feature extraction on the preprocessed first pressure-sensing signal to obtain a first feature vector, and performing feature extraction on the preprocessed second pressure-sensing signal to obtain a second feature vector; A weighted average algorithm is used to fuse the first eigenvector and the second eigenvector to obtain a fused eigenvector; The fused feature vector is used for position settlement to obtain the position information of the touch point, and a fused touch signal is generated according to the position information.

7. The teaching screen based on capacitance and electromagnetic touch according to claim 6, characterized in that: The preprocessing includes applying a digital filter to remove high-frequency and low-frequency interference in the first pressure-sensing signal and the second pressure-sensing signal, and performing normalization processing after removing a DC offset.

8. A teaching screen based on capacitance and electromagnetic touch according to any one of claims 1 to 7, characterized in that: The electromagnetic touch layer is arranged inside the backlight module of the LCD display screen and integrated with the LCD display screen. The electromagnetic induction coil of the electromagnetic touch layer is located at the lower layer of the LCD display screen, and the capacitive sensing electrode of the capacitive touch layer is located at the upper layer of the LCD display screen.

9. A teaching screen based on capacitance and electromagnetic touch according to any one of claims 1 to 7, characterized in that: The capacitive touch layer adopts a projected capacitive screen structure, has two ITO conductive layers as electrodes, and determines the position of the touch point by measuring the change in the capacitance of the capacitor.

10. An electronic device having a teaching screen based on capacitance and electromagnetic touch, characterized in that: include: A housing having at least one display opening; The capacitive touch layer is light-transmissive and disposed at the display opening, and is used to sense the capacitance change generated by the touch point to generate a first pressure-sensing signal; An LCD display screen is disposed on the other side of the capacitive touch layer relative to the display opening; The electromagnetic touch layer is disposed on the lower surface of the LCD display screen and is used to generate a second pressure-sensing signal by detecting electromagnetic changes caused by eddy currents generated at the touch point; The control unit is electrically connected to the LCD display screen, the capacitive touch layer and the electromagnetic touch layer, and is used to receive and fuse the first pressure sensing signal and the second pressure sensing signal to generate a fused touch signal, and perform operation control on the display screen of the LCD display screen according to the fused touch signal.

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