A sound-transparent display screen for preventing external eavesdropping and its protection method and device.

Abstract

This invention relates to the field of display devices, and in particular to a sound-transparent display screen and its protection method and apparatus for preventing external eavesdropping. The screen includes a screen body, internal electrodes, a capacitance detection circuit, and a processor. The screen body has multiple sound-transparent apertures for sound wave penetration. At least two mutually insulated internal electrodes are disposed on the sidewall of each sound-transparent aperture. At least two internal electrodes in the same sound-transparent aperture form a monitoring capacitor. The capacitance detection circuit is electrically connected to each internal electrode and is used to detect the capacitance value of the monitoring capacitor. The processor is electrically connected to the capacitance detection circuit and is used to determine that a foreign object has intruded into the sound-transparent aperture when the change in the capacitance value exceeds a preset allowable threshold, and to trigger a preset protection action. This invention blocks the eavesdropping path of a microprobe contacting the internal signal link through the sound-transparent apertures, while eliminating the need to block the apertures, thus achieving both high sound transmittance and high display accuracy.

Description

Technical Field

[0001] This invention relates to the field of display devices, and in particular to a sound-transparent display screen for preventing external theft and its protection method and apparatus. Background Technology

[0002] With the development of display technology, acoustically transparent displays have been widely used in cinemas, conference rooms, exhibitions, and other fields due to their dual advantages of high-definition display and high sound transmission performance. By creating dense acoustic perforations on the screen surface to construct acoustic transmission channels, they enable sound waves to penetrate the display surface without attenuation, breaking the design limitations of traditional displays that separate display and acoustics, and meeting users' needs for an immersive audio-visual experience.

[0003] However, existing acoustically transparent displays have inherent information security flaws. The acoustically transparent apertures created to achieve this function not only establish an acoustic channel but also form a physical channel connecting the inside and outside. Current research and development of acoustically transparent displays focuses primarily on optimizing performance indicators such as display accuracy, aperture ratio, and lightweight structure, without addressing the information leakage risks posed by the acoustically transparent apertures. The critical signal links within the screen (including row / column drive signals, signal bonding logic circuits, drive chips, and core signal transmission links) are spatially close to the acoustically transparent aperture area, and there are no effective physical barriers or signal protection measures. Eavesdroppers can use precision tools such as microprobes to penetrate the acoustically transparent apertures, directly contact or approach the critical signal links within the screen, and collect and analyze core image signals and drive control signals to achieve their espionage purposes.

[0004] These micro-probe theft methods are characterized by their covert operation, portable tools, and lack of obvious traces on-site. However, acoustically transparent displays are often used in scenarios where the screens are unattended for extended periods and have large screen sizes with numerous blind spots, further amplifying the risk of theft. Currently, there is no effective integrated protection technology solution in this field for the micro-probe theft problem caused by the sound-transmitting holes in acoustically transparent displays. Existing information security protection measures are mostly applicable to traditional non-acoustically transparent display devices and cannot meet the performance requirements of high sound transmittance and high display accuracy of acoustically transparent displays. Simply sealing the sound-transmitting holes or adding thick protective layers would severely sacrifice the core audio-visual performance of the acoustically transparent display, making it difficult to implement in real-world scenarios.

[0005] Therefore, how to block the microprobe eavesdropping link without sacrificing sound transmission and display performance is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a sound-transparent display screen and its protection method and device to prevent external theft, so as to solve the problem that the existing technology cannot achieve good sound transmission, display performance and anti-theft.

[0007] To solve the above-mentioned technical problems, the present invention provides a sound-transparent display screen that prevents external eavesdropping, including a screen body, internal electrodes, a capacitance detection circuit and a processor;

[0008] The screen body has multiple sound-transmitting holes for sound waves to pass through;

[0009] Each of the sound-permeable apertures has at least two mutually insulated internal electrodes on its sidewall; at least two internal electrodes in the same sound-permeable aperture form a monitoring capacitor;

[0010] The capacitance detection circuit is electrically connected to each of the electrodes inside the screen and is used to detect the capacitance value of the monitoring capacitor.

[0011] The processor is electrically connected to the capacitance detection circuit and is used to determine that a foreign object has entered the sound-transmitting pore when the change in the capacitance value is greater than a preset allowable threshold, and to trigger a preset protection action.

[0012] Optionally, in the aforementioned sound-transparent display screen designed to prevent external theft, the internal electrode is an electrode sheet obtained by first metallizing the sidewalls of the sound-transparent apertures to form a conductive metal layer, and then patterning the conductive metal layer.

[0013] Optionally, in the aforementioned sound-transparent display screen designed to prevent external espionage, the internal electrodes are grounded through the capacitance detection circuit.

[0014] A method for protecting an acoustically transparent display screen against external eavesdropping, wherein the method is based on any of the aforementioned acoustically transparent display screens against external eavesdropping, and includes:

[0015] The capacitance value of the monitored capacitor is obtained through a capacitance detection circuit;

[0016] Determine whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold.

[0017] When the difference between the measured capacitance value and the reference baseline is greater than the allowable threshold, it is determined that a foreign object has entered the sound-transmitting pore, and a preset protection action is triggered.

[0018] Optionally, in the method for protecting the sound-transparent display screen against external espionage, after determining that a foreign object has intruded into the sound-transparent aperture, the method further includes:

[0019] The marking information of the sound-transmitting pores corresponding to the monitoring capacitors whose difference between the measured capacitance value and the reference baseline is greater than the allowable threshold is determined;

[0020] The coordinates of the foreign object intrusion are determined based on the marked information.

[0021] Optionally, in the method for protecting the sound-transparent display screen against external eavesdropping, triggering a preset protection action includes:

[0022] Cut off the image driving signal corresponding to the screen;

[0023] And / or, issue an audible and visual alarm;

[0024] And / or, send intrusion alarm information to the remote monitoring platform.

[0025] Optionally, in the protection method for the sound-transparent display screen against external eavesdropping, the capacitance measurement value of the monitoring capacitor is obtained through a capacitance detection circuit, including:

[0026] The current capacitance value of the monitored capacitor is obtained through a capacitance detection circuit.

[0027] Accordingly, before determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold, the method further includes:

[0028] The reference baseline is updated based on the current capacitance measurement value;

[0029] Accordingly, determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold includes:

[0030] Determine whether the difference between the current capacitance measurement value and the updated reference baseline is greater than a preset allowable threshold.

[0031] Optionally, in the method for protecting the acoustically transparent display screen against external eavesdropping, updating the reference baseline based on the current capacitance measurement value includes:

[0032] Calculate the difference between the current capacitance measurement value and the previous capacitance measurement value, and use it as the capacitance difference value;

[0033] Multiply the capacitance difference by a preset hysteresis coefficient to obtain the baseline change.

[0034] The baseline change is added to the reference baseline to obtain the updated reference baseline.

[0035] Optionally, in the protection method for the sound-transparent display screen against external espionage, the hysteresis coefficient ranges from 0.1 to 0.5, including endpoint values.

[0036] A protective device for an acoustically transparent display screen to prevent external eavesdropping, the protective device for the acoustically transparent display screen to prevent external eavesdropping corresponds to any of the aforementioned acoustically transparent display screens to prevent external eavesdropping, comprising:

[0037] The acquisition module is used to acquire the capacitance measurement value of the monitored capacitor through the capacitance detection circuit;

[0038] The judgment module is used to determine whether the difference between the measured capacitance value and the preset reference baseline is greater than a preset allowable threshold.

[0039] The action module is used to determine that a foreign object has entered the sound-transmitting pore when the difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold, and to trigger a preset protection action.

[0040] The present invention provides a sound-transparent display screen for preventing external eavesdropping, comprising a screen body, internal electrodes, a capacitance detection circuit, and a processor; the screen body has multiple sound-transparent apertures for sound wave penetration; each sound-transparent aperture has at least two mutually insulated internal electrodes on its sidewall; at least two internal electrodes in the same sound-transparent aperture form a monitoring capacitor; the capacitance detection circuit is electrically connected to each internal electrode and is used to detect the capacitance value of the monitoring capacitor; the processor is electrically connected to the capacitance detection circuit and is used to determine that a foreign object has entered the sound-transparent aperture when the change in the capacitance value exceeds a preset allowable threshold, and to trigger a preset protection action. This invention utilizes the principle of capacitance detection to achieve contactless intrusion detection. Whenever an object enters the acoustically transparent aperture and alters the electric field distribution, it triggers a change in the capacitance value of the monitoring capacitor, leading to accurate detection. The detection sensitivity is high, and each acoustically transparent aperture corresponds to an independent monitoring capacitor, achieving full coverage protection for the entire screen surface and eliminating blind spots in the protection of large-size screens. This invention physically blocks the path of microprobes to access internal signal links through the acoustically transparent apertures, preventing information leakage from the acoustically transparent display screen. Furthermore, it eliminates the need to seal the acoustically transparent apertures, thus maintaining both high sound transmittance and high display accuracy. This invention also provides a method and device for protecting acoustically transparent displays against external eavesdropping, achieving the aforementioned beneficial effects. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A partial structural schematic diagram of a specific embodiment of the sound-transparent display screen for preventing external eavesdropping provided by the present invention;

[0043] Figure 2 A flowchart illustrating a specific embodiment of the protection method for an acoustically transparent display screen against external eavesdropping provided by the present invention;

[0044] Figure 3This is a schematic diagram of a specific embodiment of the protective device for an acoustically transparent display screen against external theft provided by the present invention.

[0045] Figure label:

[0046] 10-Screen body; 11-Inner electrode of the screen; 21-Capacitance detection circuit; 22-Processor; 100-Acquisition module; 200-Judgment module; 300-Action module. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The core of this invention is to provide a sound-transparent display screen that prevents external eavesdropping, and a structural schematic diagram of one specific embodiment is shown below. Figure 1 As shown, it is referred to as Specific Implementation Method 1, including screen body 10, screen internal electrode 11, capacitance detection circuit 21 and processor 22;

[0049] The screen 10 has multiple sound-transmitting holes for sound waves to pass through.

[0050] Each of the sound-permeable apertures has at least two mutually insulated internal electrodes 11 on its sidewall; at least two internal electrodes 11 in the same sound-permeable aperture form a monitoring capacitor;

[0051] The capacitance detection circuit 21 is electrically connected to each of the in-screen electrodes 11 and is used to detect the capacitance value of the monitoring capacitor.

[0052] The processor 22 is electrically connected to the capacitance detection circuit 21 and is used to determine that a foreign object has entered the sound-transmitting pore when the change in the capacitance value is greater than a preset allowable threshold, and to trigger a preset protection action.

[0053] The capacitance detection circuit 21 detects the change in capacitance value of the monitoring capacitor, which can be determined by the amount of charge transfer between the electrodes 11 inside the screen that make up the monitoring capacitor. Of course, it can also be determined by other methods, which are not limited here.

[0054] In a preferred embodiment, the electrode 11 inside the screen is obtained by first depositing a conductive metal layer on the entire sidewall of the sound-transmitting aperture through a metallization process, and then patterning the conductive metal layer to obtain the electrode sheet.

[0055] In this preferred embodiment, the internal electrodes 11 can be fabricated using mature PCB inner wall metallization and patterning processes, which are fully compatible with existing acoustically transparent display screen manufacturing processes. No additional complex production equipment is required, resulting in low production costs and easy mass production. Furthermore, by metallizing the entire sidewall of the acoustically transparent aperture before patterning and separating it, the precision and insulation performance of the electrode sheets can be guaranteed, preventing short circuits or leakage between electrodes, improving the accuracy of capacitance detection, extending service life, and adapting to the long-term operating environment of the acoustically transparent display screen.

[0056] In one specific implementation, the in-screen electrode 11 is grounded through the capacitance detection circuit 21.

[0057] In this specific embodiment, by grounding all the electrodes 11 inside the screen, the potential of the electrodes 11 inside the screen can be stabilized, the influence of external electromagnetic interference on the capacitance detection result can be reduced, and the anti-interference capability and stability of capacitance detection can be improved. On the other hand, the grounding design can effectively discharge static charge, avoid static accumulation from damaging the electrodes 11 inside the screen and the capacitance detection circuit 21, and improve the reliability of the system.

[0058] The present invention provides a sound-transparent display screen for preventing external theft, comprising a screen body 10, internal electrodes 11, a capacitance detection circuit 21, and a processor 22. The screen body 10 has multiple sound-transparent apertures for sound wave penetration. At least two mutually insulated internal electrodes 11 are disposed on the sidewall of each sound-transparent aperture. At least two internal electrodes 11 within the same sound-transparent aperture form a monitoring capacitor. The capacitance detection circuit 21 is electrically connected to each internal electrode 11 and is used to detect the capacitance value of the monitoring capacitor. The processor 22 is electrically connected to the capacitance detection circuit 21 and is used to determine that a foreign object has intruded into the sound-transparent aperture when the change in the capacitance value exceeds a preset allowable threshold, and to trigger a preset protection action. This invention utilizes the principle of capacitance detection to achieve contactless intrusion detection. As long as an object enters the sound-permeable aperture and changes the electric field distribution, it can cause a change in the capacitance value of the monitoring capacitor, thus being accurately detected. The detection sensitivity is high, and each sound-permeable aperture corresponds to an independent monitoring capacitor, achieving full coverage protection of the entire screen surface and eliminating the protection blind spots of large-size screens 10. This invention physically blocks the path of micro probes to contact the internal signal links through the sound-permeable apertures, avoiding the information leakage problem of the sound-permeable display screen. At the same time, there is no need to block the sound-permeable apertures, which means that the high sound transmittance and high display accuracy of the sound-permeable display screen are both maintained.

[0059] This invention also provides a method for protecting an acoustically transparent display screen against external eavesdropping. This method is based on any of the aforementioned acoustically transparent display screens designed to prevent external eavesdropping. A flowchart illustrating a specific embodiment is shown below. Figure 2As shown, this is referred to as Specific Implementation Method Two, which includes:

[0060] S101: Obtain the capacitance measurement value of the monitored capacitor through the capacitance detection circuit 21.

[0061] The capacitance measurement value in this step can be the capacitance value obtained from a single measurement, or it can be the value obtained after processing the capacitance values ​​obtained over a period of time. This invention does not limit the value.

[0062] S102: Determine whether the difference between the measured capacitance value and the preset reference baseline is greater than the preset allowable threshold.

[0063] It should be noted that the "difference" in this step refers to the difference between the larger and smaller values. It can also be assumed that the difference will not be less than zero for ease of calculation.

[0064] S103: When the difference between the measured capacitance value and the reference baseline is greater than the allowable threshold, it is determined that a foreign object has entered the sound-transmitting pore, and a preset protection action is triggered.

[0065] Specifically, the preset protection actions triggered in this step include:

[0066] A1: Cut off the image driving signal corresponding to the screen 10.

[0067] And / or, A2: Issue an audible and visual alarm.

[0068] And / or, A3: Send intrusion alarm information to the remote monitoring platform.

[0069] It is clear that steps A1, A2, and A3 in this specific embodiment do not have a strict sequential relationship; they are parallel and can be selected for execution according to actual needs. This specific embodiment provides multi-layered and comprehensive security protection measures. On the one hand, cutting off the image driving signal can prevent the display and leakage of classified content at the source; on the other hand, issuing audible and visual alarms can promptly remind on-site personnel; and on the other hand, remote alarm information can realize security monitoring in unattended scenarios. Users can flexibly select and combine different protection actions according to the needs of actual application scenarios to improve the applicability of the system.

[0070] Furthermore, after determining that a foreign object has intruded into the sound-transmitting pores, the method further includes:

[0071] B1: Determine the marking information of the acoustic pores corresponding to the monitoring capacitors whose difference between the measured capacitance value and the reference baseline is greater than the allowable threshold.

[0072] The marking information may be a pre-set numbering information of the sound-transmitting pores, or location information, or other information uniquely corresponding to the sound-transmitting pores. This invention does not limit this information.

[0073] B2: Determine the coordinates of the foreign object intrusion based on the marked information.

[0074] In this preferred embodiment, by marking the sound-transmitting pores with abnormal capacitance values, the specific location of foreign object intrusion can be accurately located, facilitating rapid investigation and handling by on-site personnel, and improving the efficiency and effectiveness of safety protection.

[0075] The protection method for the sound-transparent display screen against external theft provided by this invention, based on the aforementioned sound-transparent display screen against external theft, realizes real-time and continuous monitoring of the sound-transparent apertures. It can detect and trigger protection actions at the first moment of foreign object intrusion, effectively preventing the leakage of confidential information and copyrighted content. Moreover, the detection logic is simple and clear, with low computational load, suitable for running in embedded systems, can meet real-time requirements, and has a low false alarm rate.

[0076] In one preferred embodiment, the capacitance measurement value of the monitored capacitor is obtained through the capacitance detection circuit 21, including:

[0077] C1: Obtain the current capacitance measurement value of the monitored capacitor through the capacitance detection circuit 21.

[0078] The capacitance detection circuit 21 measures the capacitance value of the monitored capacitor at preset intervals, and each newly acquired capacitance value is the current capacitance measurement value.

[0079] Accordingly, before determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold, the method further includes:

[0080] C2: Update the reference baseline based on the current capacitance measurement.

[0081] In this preferred embodiment, the reference baseline is changed each time a new capacitance measurement value (i.e., the current capacitance measurement value) is acquired.

[0082] Accordingly, determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold includes:

[0083] C3: Determine whether the difference between the current capacitance measurement value and the updated reference baseline is greater than a preset allowable threshold.

[0084] After updating the reference baseline based on the newly acquired current capacitance measurement value, it is then determined whether the difference between the two is greater than the preset allowable threshold.

[0085] In this preferred embodiment, a dynamically updated reference baseline is used instead of the traditional static baseline. This can adapt to slow environmental drift such as temperature changes, sensor aging, and changes in ambient humidity, effectively eliminating the influence of environmental factors on the detection results and further reducing the false alarm rate. Moreover, the reference baseline is automatically adjusted with environmental changes, eliminating the need for manual periodic calibration and reducing the system's maintenance costs and workload.

[0086] Furthermore, based on the current capacitance measurement, the reference baseline is updated, including:

[0087] D1: Calculate the difference between the current capacitance measurement value and the previous capacitance measurement value, and use it as the capacitance difference value.

[0088] D2: Multiply the capacitance difference by a preset hysteresis coefficient to obtain the baseline change.

[0089] D3: Add the baseline change to the reference baseline to obtain the updated reference baseline.

[0090] The algorithm of this preferred embodiment is simple to calculate, involving only subtraction, multiplication and addition operations, with a very small computational load. It is very suitable for running in the resource-constrained embedded processor 22, and can ensure the real-time performance of the system. At the same time, by introducing a hysteresis coefficient, this preferred embodiment makes the reference baseline follow the long-term trend of the measured value only, without responding to rapid signal changes, which can effectively separate the real intrusion signal and transient noise interference.

[0091] Of course, the first update of the reference baseline also needs to provide an initial reference baseline value. Specifically, the current capacitance measurement value obtained for the first time can be directly used as the initial reference baseline, that is, the following formula (1):

[0092] base(0)=x(0); (1)

[0093] Where base(n) is the value of the reference baseline for the nth time, and x(n) is the current capacitance measurement value for the nth time; then equation (1) represents taking the first capacitance measurement value as the initial reference baseline value.

[0094] Accordingly, the baseline change is calculated using equations (2) and (3):

[0095] Δx(n) = x(n) - x(n-1); (2)

[0096] β = α × Δx(n); (3)

[0097] Where Δx(n) is the capacitance difference corresponding to the current capacitance measurement value obtained in the nth time, β is the corresponding baseline change, and α is the hysteresis coefficient.

[0098] Accordingly, the update of the reference baseline is calculated by the following equation (4):

[0099] base(n)=base(n-1)+β; (4)

[0100] The meaning of each element in equation (4) can be found in the previous text and will not be repeated here.

[0101] Of course, after equation (4), further drift correction can be performed using equation (5), including:

[0102] y(n)=x(n)-base(n); (5)

[0103] Where y(n) is the valid signal obtained for the nth time after eliminating drift, and y(n) is used to determine whether there is foreign object intrusion.

[0104] Furthermore, the hysteresis coefficient ranges from 0.1 to 0.5, including endpoint values ​​such as 0.10, 0.41, or 0.50. This range has been verified through extensive experiments, ensuring the stability of the reference baseline while responding promptly to slow environmental changes, thus balancing the system's anti-interference capability and detection sensitivity. Of course, users can flexibly adjust the hysteresis coefficient within this range according to the environmental characteristics of the actual application scenario to obtain the best detection effect.

[0105] The present invention provides a method for protecting a sound-transparent display screen against external eavesdropping. This method is based on any of the aforementioned sound-transparent display screens and includes: acquiring a capacitance measurement value of a monitoring capacitor via a capacitance detection circuit 21; determining whether the difference between the capacitance measurement value and a preset reference baseline is greater than a preset allowable threshold; and determining that a foreign object has intruded into the sound-transparent aperture when the difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold, and triggering a preset protection action. This invention utilizes the principle of capacitance detection to achieve contactless intrusion detection. As long as an object enters the sound-permeable aperture and changes the electric field distribution, it can cause a change in the capacitance value of the monitoring capacitor, thus being accurately detected. The detection sensitivity is high, and each sound-permeable aperture corresponds to an independent monitoring capacitor, achieving full coverage protection of the entire screen surface and eliminating the protection blind spots of large-size screens 10. This invention physically blocks the path of micro probes to contact the internal signal links through the sound-permeable apertures, avoiding the information leakage problem of the sound-permeable display screen. At the same time, there is no need to block the sound-permeable apertures, which means that the high sound transmittance and high display accuracy of the sound-permeable display screen are both maintained.

[0106] The following describes the protection device for the sound-transparent display screen against external eavesdropping provided by the embodiments of the present invention. The protection device for the sound-transparent display screen against external eavesdropping described below and the protection method for the sound-transparent display screen against external eavesdropping described above can be referred to in correspondence with each other.

[0107] Figure 3 This is a structural block diagram of a protective device for an acoustically transparent display screen to prevent external eavesdropping, provided in an embodiment of the present invention. The protective device corresponds to any of the aforementioned acoustically transparent display screens designed to prevent external eavesdropping. (Refer to...) Figure 3 Protective devices for sound-transparent displays that prevent external eavesdropping may include:

[0108] The acquisition module 100 is used to acquire the capacitance measurement value of the monitored capacitor through the capacitance detection circuit 21;

[0109] The judgment module 200 is used to determine whether the difference between the measured capacitance value and the preset reference baseline is greater than the preset allowable threshold.

[0110] The action module 300 is used to determine that a foreign object has entered the sound-transmitting pore when the difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold, and to trigger a preset protection action.

[0111] In one specific implementation, the judgment module 200 further includes:

[0112] A marking unit is used to determine the marking information of the sound-transmitting pores corresponding to the monitoring capacitors whose difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold.

[0113] The coordinate determination unit is used to determine the coordinates of the foreign object intrusion based on the marking information.

[0114] In one specific implementation, the action module 300 includes:

[0115] The signal cutting-off unit is used to cut off the image driving signal corresponding to the screen 10;

[0116] And / or, an alarm unit for issuing audible and visual alarms;

[0117] And / or, a sending unit, used to send intrusion alarm information to a remote monitoring platform.

[0118] In one specific implementation, the acquisition module 100 includes:

[0119] The current value acquisition unit is used to acquire the current capacitance measurement value of the monitored capacitor through the capacitance detection circuit 21;

[0120] Accordingly, the judgment module 200 further includes:

[0121] A baseline update unit is used to update the reference baseline based on the current capacitance measurement value;

[0122] An update judgment unit is used to determine whether the difference between the current capacitance measurement value and the updated reference baseline is greater than a preset allowable threshold.

[0123] In one specific implementation, the judgment module 200 includes:

[0124] The capacitance difference unit is used to calculate the difference between the current capacitance measurement value and the previous capacitance measurement value, as the capacitance difference value.

[0125] The hysteresis coefficient unit is used to multiply the capacitance difference by a preset hysteresis coefficient to obtain the baseline change.

[0126] The baseline summing unit is used to add the baseline change to the reference baseline to obtain the updated reference baseline.

[0127] The protective device for an acoustically transparent display screen against external eavesdropping provided by this invention includes an acquisition module 100 for acquiring the capacitance measurement value of a monitoring capacitor through a capacitance detection circuit 21; a judgment module 200 for judging whether the difference between the capacitance measurement value and a preset reference baseline is greater than a preset allowable threshold; and an action module 300 for determining that a foreign object has intruded into the acoustically transparent aperture when the difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold, and triggering a preset protection action. This invention utilizes the capacitance detection principle to achieve contactless intrusion detection. As long as an object enters the acoustically transparent aperture and changes the electric field distribution, it can cause a change in the capacitance value of the monitoring capacitor, thus being accurately detected. The detection sensitivity is high, and each acoustically transparent aperture corresponds to an independent monitoring capacitor, achieving full coverage protection of the entire screen surface and eliminating blind spots in the protection of large-size screens 10. This invention physically blocks the eavesdropping path of microprobes contacting internal signal links through the acoustically transparent apertures, avoiding information leakage problems of the acoustically transparent display screen. At the same time, it eliminates the need to block the acoustically transparent apertures, meaning that it balances the high sound transmittance and high display accuracy of the acoustically transparent display screen.

[0128] The protective device for the sound-transparent display screen against external eavesdropping in this embodiment is used to implement the aforementioned protective method for the sound-transparent display screen against external eavesdropping. Therefore, the specific implementation of the protective device for the sound-transparent display screen against external eavesdropping can be found in the embodiment section of the protective method for the sound-transparent display screen against external eavesdropping mentioned above. For example, the acquisition module 100, the judgment module 200, and the action module 300 are respectively used to implement steps S101, S102, and S103 in the above-mentioned protective method for the sound-transparent display screen against external eavesdropping. Therefore, the specific implementation can be referred to the description of the corresponding embodiments, which will not be repeated here.

[0129] The present invention also provides a protective device for an acoustically transparent display screen to prevent external eavesdropping, comprising:

[0130] Memory, used to store computer programs;

[0131] A central processing unit (CPU) is used to execute the computer program to implement the steps of the protection method for the sound-transparent display screen against external eavesdropping as described above. The sound-transparent display screen against external eavesdropping provided by this invention includes a screen body 10, internal electrodes 11, a capacitance detection circuit 21, and a processor 22. The screen body 10 has multiple sound-transparent apertures for sound wave penetration. At least two mutually insulated internal electrodes 11 are provided on the sidewall of each sound-transparent aperture. At least two internal electrodes 11 in the same sound-transparent aperture form a monitoring capacitor. The capacitance detection circuit 21 is electrically connected to each internal electrode 11 and is used to detect the capacitance value of the monitoring capacitor. The processor 22 is electrically connected to the capacitance detection circuit 21 and is used to determine that a foreign object has intruded into the sound-transparent aperture when the change in the capacitance value exceeds a preset allowable threshold, and to trigger a preset protection action. This invention utilizes the principle of capacitance detection to achieve contactless intrusion detection. As long as an object enters the sound-permeable aperture and changes the electric field distribution, it can cause a change in the capacitance value of the monitoring capacitor, thus being accurately detected. The detection sensitivity is high, and each sound-permeable aperture corresponds to an independent monitoring capacitor, achieving full coverage protection of the entire screen surface and eliminating the protection blind spots of large-size screens 10. This invention physically blocks the path of micro probes to contact the internal signal links through the sound-permeable apertures, avoiding the information leakage problem of the sound-permeable display screen. At the same time, there is no need to block the sound-permeable apertures, which means that the high sound transmittance and high display accuracy of the sound-permeable display screen are both maintained.

[0132] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor 22, implements the steps of any of the above-described methods for protecting an externally espionage-proof sound-transparent display screen. The externally espionage-proof sound-transparent display screen provided by the present invention includes a screen body 10, internal electrodes 11, a capacitance detection circuit 21, and a processor 22. The screen body 10 has multiple sound-transparent apertures for sound wave penetration. At least two mutually insulated internal electrodes 11 are disposed on the sidewall of each sound-transparent aperture. At least two internal electrodes 11 in the same sound-transparent aperture form a monitoring capacitor. The capacitance detection circuit 21 is electrically connected to each internal electrode 11 and is used to detect the capacitance value of the monitoring capacitor. The processor 22 is electrically connected to the capacitance detection circuit 21 and is used to determine that a foreign object has intruded into the sound-transparent aperture when the change in the capacitance value exceeds a preset allowable threshold, and to trigger a preset protection action. This invention utilizes the principle of capacitance detection to achieve contactless intrusion detection. As long as an object enters the sound-permeable aperture and changes the electric field distribution, it can cause a change in the capacitance value of the monitoring capacitor, thus being accurately detected. The detection sensitivity is high, and each sound-permeable aperture corresponds to an independent monitoring capacitor, achieving full coverage protection of the entire screen surface and eliminating the protection blind spots of large-size screens 10. This invention physically blocks the path of micro probes to contact the internal signal links through the sound-permeable apertures, avoiding the information leakage problem of the sound-permeable display screen. At the same time, there is no need to block the sound-permeable apertures, which means that the high sound transmittance and high display accuracy of the sound-permeable display screen are both maintained.

[0133] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0134] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0135] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0136] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0137] The above provides a detailed description of the sound-transparent display screen for preventing external eavesdropping, as well as its protection method, device, equipment, and storage medium. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the invention.

Claims

1. A sound-transparent display screen for preventing external eavesdropping, characterized in that, Includes the screen body, internal electrodes, capacitance detection circuit, and processor; The screen body has multiple sound-transmitting holes for sound waves to pass through; Each of the sound-permeable apertures has at least two mutually insulated internal electrodes on its sidewall; at least two internal electrodes in the same sound-permeable aperture form a monitoring capacitor; The capacitance detection circuit is electrically connected to each of the electrodes inside the screen and is used to detect the capacitance value of the monitoring capacitor. The processor is electrically connected to the capacitance detection circuit and is used to determine that a foreign object has entered the sound-transmitting pore when the change in the capacitance value is greater than a preset allowable threshold, and to trigger a preset protection action.

2. The sound-transparent display screen for preventing external eavesdropping as described in claim 1, characterized in that, The electrode inside the screen is obtained by first metallizing the sidewalls of the sound-transmitting pores to form a conductive metal layer, and then patterning the conductive metal layer to obtain the electrode sheet.

3. The sound-transparent display screen for preventing external eavesdropping as described in claim 1, characterized in that, The electrodes inside the screen are grounded through the capacitance detection circuit.

4. A method for protecting an acoustically transparent display screen against external eavesdropping, characterized in that, The method for protecting the acoustically transparent display screen against external eavesdropping is based on the acoustically transparent display screen against external eavesdropping as described in any one of claims 1 to 3, and includes: The capacitance value of the monitored capacitor is obtained through a capacitance detection circuit; Determine whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold. When the difference between the measured capacitance value and the reference baseline is greater than the allowable threshold, it is determined that a foreign object has entered the sound-transmitting pore, and a preset protection action is triggered.

5. The protection method for an acoustically transparent display screen against external eavesdropping as described in claim 4, characterized in that, After determining that a foreign object has intruded into the acoustic pores, the process further includes: The marking information of the sound-transmitting pores corresponding to the monitoring capacitors whose difference between the measured capacitance value and the reference baseline is greater than the allowable threshold is determined; The coordinates of the foreign object intrusion are determined based on the marked information.

6. The protection method for an acoustically transparent display screen against external eavesdropping as described in claim 4, characterized in that, Trigger preset protection actions, including: Cut off the image driving signal corresponding to the screen; And / or, issue an audible and visual alarm; And / or, send intrusion alarm information to the remote monitoring platform.

7. The method for protecting an acoustically transparent display screen against external eavesdropping as described in claim 4, characterized in that, The capacitance measurement value of the monitored capacitor is obtained through a capacitance detection circuit, including: The current capacitance value of the monitored capacitor is obtained through a capacitance detection circuit. Accordingly, before determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold, the method further includes: The reference baseline is updated based on the current capacitance measurement value; Accordingly, determining whether the difference between the measured capacitance value and a preset reference baseline is greater than a preset allowable threshold includes: Determine whether the difference between the current capacitance measurement value and the updated reference baseline is greater than a preset allowable threshold.

8. The method for protecting an acoustically transparent display screen against external eavesdropping as described in claim 7, characterized in that, The reference baseline is updated based on the current capacitance measurement, including: Calculate the difference between the current capacitance measurement value and the previous capacitance measurement value, and use it as the capacitance difference value; Multiply the capacitance difference by a preset hysteresis coefficient to obtain the baseline change. The baseline change is added to the reference baseline to obtain the updated reference baseline.

9. The method for protecting an acoustically transparent display screen against external eavesdropping as described in claim 8, characterized in that, The hysteresis coefficient ranges from 0.1 to 0.5, including the endpoint values.

10. A protective device for an acoustically transparent display screen to prevent external theft, characterized in that, The protective device for the sound-transparent display screen against external eavesdropping corresponds to the sound-transparent display screen against external eavesdropping as described in any one of claims 1 to 3, and includes: The acquisition module is used to acquire the capacitance measurement value of the monitored capacitor through the capacitance detection circuit; The judgment module is used to determine whether the difference between the measured capacitance value and the preset reference baseline is greater than a preset allowable threshold. The action module is used to determine that a foreign object has entered the sound-transmitting pore when the difference between the capacitance measurement value and the reference baseline is greater than the allowable threshold, and to trigger a preset protection action.

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