Display terminal anti-videography device capable of automatically detecting startup and shutdown

Abstract

The invention discloses a display terminal anti-video recording device capable of automatically detecting startup and shutdown, which is characterized in that after a computer externally connected with the device is started, the computer outputs a video HDMI signal, an HDMI signal detection module sends an instruction of detecting the signal to a second MCU controller module, the second MCU controller module sends a high level to a host controller module, and the host controller module sends the high level to the host controller module; the host controller module executes a power-on startup program; when the host controller module is started and enters a normal working state, the host controller module receives image information from the camera module in real time, recognizes risk image information and executes screen locking operation on a computer externally connected with the device through the first MCU controller module. And after the computer is shut down, the computer stops outputting HDMI video information, the HDMI signal detection module sends an instruction of not detecting a signal to the second MCU controller module, the second MCU controller module sends a low level to the host control module, and the host control module and the computer maintain synchronous shutdown.

Description

Technical Field

[0001] The present invention relates to the field of electronic information, and in particular to a display terminal anti-recording device with automatic power on / off detection. Background Art

[0002] The invention relates to a display terminal anti-recording device with automatic detection of power on and off, which realizes automatic power on and off based on HDMI signal detection. The device can be automatically turned on and off by detecting the video signal output by the computer external to the device; and the lock screen mode of the computer can be controlled by the lock screen mode switching module.

[0003] As an auxiliary device for computers and display terminals, the display terminal anti-recording device exists independently and is mainly used to protect the video information output by the computer. It is used as a safety protection device for the display terminal connected to the computer. Its power on and off status needs to be synchronized with the power on and off actions of the computer to achieve the purpose of protecting the video information output by the computer and prevent the display terminal anti-recording device from being in the power on state after the computer is shut down, which wastes resources and also brings certain safety risks. Summary of the Invention

[0004] The present invention provides a display terminal anti-recording device with automatic power on / off detection. As an external device for a computer, the present invention can protect the video information output by the computer from being captured and recorded on the display terminal in real time. At the same time, as an independent external device, it can automatically maintain synchronization with the computer when it is turned on and off. Detailed description is given below:

[0005] A display terminal anti-recording device with automatic power on / off detection, the device comprising:

[0006] When the computer connected to the device is turned on, the computer outputs the video HDMI signal, the HDMI signal detection module sends the instruction of detecting the signal to the second MCU controller module, the second MCU controller module sends a high level to the host controller module, and the host controller module executes the power-on program;

[0007] When the host controller module is powered on and enters a normal working state, the host controller module receives image information from the camera module in real time, identifies risky image information, and executes a screen lock operation on a computer connected to the device through the first MCU controller module;

[0008] When the computer is shut down, the computer stops outputting HDMI video information, and the HDMI signal detection module sends an instruction that no signal is detected to the second MCU controller module. The second MCU controller module sends a low level to the host control module, and the host control module and the computer are shut down synchronously.

[0009] The HDMI input connector is connected to a computer via an HDMI cable; the HDMI output connector is connected to an external display terminal via an HDMI cable; the display terminal is provided with a camera module, which is connected to the host controller module via the camera module connector. The first MCU controller module is connected to the computer via a USB output connector and USB line, serving as a peripheral computer mouse and keyboard.

[0010] The lock screen operation is performed by the lock screen mode switching module.

[0011] When the first MCU controller module receives a high-level signal from the lock screen mode switching module, it locks the computer screen to the desktop; when the first MCU controller module receives a low-level signal from the lock screen mode switching module, it locks the computer screen to a black screen.

[0012] The device further includes a TF card storage module connector, which is used to store the recorded risk image determined by the host controller module and supports hot plugging.

[0013] The device further includes: an RJ45 network connector, and the RJ45 network connector supports network data transmission and network camera module expansion.

[0014] Among them, the host controller module supports the simultaneous access of 16-channel network camera modules and supports one computer to connect to multiple display terminals, including security protection for display terminals of different types and sizes.

[0015] The beneficial effects of the technical solution provided by the present invention are:

[0016] 1. As an external device of the computer, this device can be turned on and off synchronously with the computer, which not only protects the video signal output by the computer, but also automatically shuts down when protection is not needed, thus reducing manual operation, saving power and minimizing safety risks of the device;

[0017] 2. This device cleverly uses the HDMI video signal output by the computer as the detection signal for the device to start and shut down, and has determined an effective detection circuit design;

[0018] 3. This device has a network interface and supports the access of multiple network cameras, which can meet the security protection requirements of different application scenarios and different forms of display terminals;

[0019] 4. This device uses a single-chip microcomputer to simulate a mouse and keyboard, and can perform related operations on an external computer to achieve lock screen protection for the display terminal, while supporting different lock screen methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a display terminal anti-recording device with automatic power on / off detection;

[0021] Figure 2 This is a schematic diagram of the automatic power on / off detection circuit;

[0022] Figure 3 This is a schematic diagram of the automatic power-on detection process;

[0023] Figure 4 This is a schematic diagram of the automatic shutdown detection process;

[0024] Figure 5 This is a schematic diagram of the shutdown control level conversion;

[0025] Figure 6 A schematic diagram showing the terminal protection deployment plan;

[0026] Figure 7 A schematic diagram showing the terminal lock screen protection process;

[0027] Figure 8 A schematic diagram showing the design principle of terminal lock screen protection;

[0028] Figure 9 Schematic diagram of the lock screen mode switching circuit design.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1: First MCU controller module; 2: Second MCU controller module;

[0031] 3: Host controller module; 4: HDMI signal detection module;

[0032] 5: Camera module connector; 6: Lock screen mode switching module;

[0033] 7: TF card storage module connector; 8: RJ45 network connector;

[0034] 9: HDMI input connector; 10: HDMI output connector. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention are described in further detail below.

[0036] A display terminal anti-recording device with automatic detection of power on and off, the functional block diagram of the device is as follows Figure 1As shown, the device is externally configured with an HDMI input connector 9, an HDMI output connector 10, a camera module connector 5, a TF card storage module connector 7 and an RJ45 network connector 8.

[0037] Among them, the HDMI input connector 9 is connected to the computer via an HDMI cable; the HDMI output connector 10 is connected to the external display terminal via an HDMI cable; the display terminal is provided with a camera module, which is connected to the host controller module 3 via the camera module connector 5; the TF card storage module connector 7 can be connected to the TF card; the RJ45 network connector 8 is connected to the network via a network cable.

[0038] The device detects the video HDMI signal output by the external computer to realize automatic startup and shutdown. When the external computer is turned on, the computer outputs the video HDMI signal. The HDMI signal detection module 4 sends the instruction of the detected signal to the second MCU controller module 2. After receiving the instruction, the second MCU controller module 2 sends a high level to the startup pin of the host controller module 3, and the host controller module 3 executes the power-on program. When the host controller module 3 is turned on and enters the normal working state, the host controller module 3 receives the image information from the camera module in real time, and identifies the received image information to determine whether there is a shooting and record risk images. Once the risk image information is identified, the host controller module 3 executes a lock screen operation on the computer external to the device through the first MCU controller module 1 to protect the display terminal external to the computer from being recorded in the computer; when the computer is shut down, the computer stops outputting HDMI video information, and the HDMI signal detection module 4 can no longer identify the valid signal, and synchronously sends the instruction that no signal is detected to the second MCU controller module 2. The second MCU controller module 2 sends a low level to the shutdown pin of the host control module 3. After receiving the low level, the shutdown pin of the host control module 3 executes the shutdown program and keeps shutting down synchronously with the computer.

[0039] The MIPI signal controller receives the HDMI signal, converts the HDMI signal into a MIPI signal and outputs it to the host controller module 3. After the peripheral interface connection configuration of the device is completed, the power is connected and the device enters the normal power-on detection state. The power-on detection circuit is as follows: Figure 2 As shown, the HDMI signal detection module 4 receives the video display signal output from the external computer. If a signal input is recognized, it outputs a high level to the second MCU controller module 2. When the second MCU controller module 2 receives the high level, it outputs a high level power-on enable signal to the power-on control pin of the host controller module 3 through the GPIO. After the power-on control pin of the host controller module 3 is pulled high, the power-on process is entered, the device is powered on, and the device enters the normal working mode. The power-on detection process is as follows: Figure 3 shown.

[0040] The signal detection chip U1 in the power-on detection circuit utilizes the AD8313, a complete multi-stage demodulation logarithmic amplifier. This logarithmic amplifier operates at a frequency of 0.1GHz to 3.5GHz and features a fast response time of 40ns. The input signal for signal detection chip U1 comes from the computer's video output signal. In this circuit design, the differential positive-phase signal (HDMI_D1DP_IN) of channel 1 of the computer's HDMI video signal data line serves as the input signal for signal detection chip U1. Since the maximum frequency of a single HDMI video signal channel is currently 3.4GHz, signal detection chip U1 (AD8313) can meet the sampling signal's frequency range. Furthermore, the 40ns detection response time of signal detection chip U1 (AD8313) fully meets the device's power-on detection time requirements.

[0041] Among them, when the signal detection chip U1 (AD8313) detects a signal input, it outputs a high level to the second MCU controller module 2 through Pin7 (output pin 7). In this circuit design, when the second MCU controller module 2 adopts the 8-pin single-chip microcomputer STC8G1K08A, pin 1 of the second MCU controller module 2 (STC8G1K08A) is used as the signal input pin to receive the detection result output from the signal detection chip U1 (AD8313). When the second MCU controller module 2 (STC8G1K08A) receives the high level, the second MCU controller module 2 (STC8G1K08A) outputs a high level Power on_EN (power on enable) signal through pin 8 to the power on control pin of the host controller module 3. After the power on control pin of the host controller module 3 is pulled high, the power on program is automatically executed.

[0042] Among them, such as Figure 2As shown in the circuit design of the power on / off detection circuit, the design values ​​of the components in the hardware link are: capacitor C1 is 1nF, resistor R2 is 53.6Ω, capacitor C2 is 1uF, resistor R1 is 10Ω, resistor R3 is 10Ω, capacitor C3 is 0.1uF, capacitor C4 is 0.1uF, capacitor C5 is 0.1uF, and resistor R4 is 10K; capacitor C1 is used as a coupling capacitor to filter out clutter, reduce interference with the input signal, and perform bandwidth matching; resistor R2 is used for impedance matching; resistor R3 and capacitor C3, resistor R1 and capacitor C4 respectively form RC filter circuits to remove power supply noise; pins 6 and 5 of the second MCU controller module 2 (STC8G1K08A) are connected to an external 2-pin pin header (DownLoad Header1) for firmware burning; after actual verification, the data differential positive phase signal of the HDMI video signal output by the computer can be effectively detected and identified.

[0043] Among them, when the computer is shut down, the computer no longer outputs video signals to the display terminal, and the device does not need to perform display protection on the display terminal, that is, the device can perform its own shutdown operation along with the computer shutdown action. Figure 4 The figure shows a flowchart of device shutdown detection. Once the computer shutdown command is executed, the output of the HDMI video signal is stopped, and the display terminal no longer displays any information about the computer. At the same time, the input pin 1 of the signal detection chip U1 (AD8313) can no longer receive the input HDMI data single-ended positive phase signal (HDMI_D1DP_IN). At this time, the output pin 8 of the signal detection chip U1 (AD8313) outputs a low level to the pin 1 of the second MCU controller module 2 (STC8G1K08A). After receiving the low level input, the pin 1 of the second MCU controller module 2 outputs a high level shutdown enable signal Power off_EN through the GPIO pin 7. The shutdown enable signal Power off_EN with a high level state is converted into a low level after level conversion and sent to the shutdown control pin of the host controller module 3. When the shutdown control pin of the host controller module 3 receives the low level signal, the system shutdown operation is immediately executed to achieve synchronous shutdown of the device and the computer.

[0044] Among them, the level conversion circuit of the shutdown enable signal Power off_EN is as follows Figure 5As shown, when the Power off_EN signal is high, transistor Q1 conducts, and the Power off signal output to host controller module 3 is pulled low. When the shutdown pin of host controller module 3 receives a low-level signal, the shutdown procedure is executed. In this circuit design, host controller module 3 uses the CV186 processor of the computing platform. The CV186's system shutdown control pin executes the shutdown operation after receiving a low-level signal.

[0045] During normal operation after the computer is turned on, the video signal output by the computer is displayed normally on the display terminal, the device is also in normal working condition, the camera module connected to the device is installed at a suitable position above the display terminal, and the hardware connections between the computer, device, camera module and display terminal are as follows: Figure 6 The terminal protection deployment plan is displayed.

[0046] Among them, during the normal operation of the computer, device and display terminal, the host controller module 3 receives the image information collected by the camera module in real time and determines in real time whether there is a risk of recording based on the image information around the display terminal. Once it is determined that there is a risk of recording, the host controller module 3 immediately sends an instruction to the first MCU controller module 1. After receiving the instruction from the host controller module 3, the first MCU controller module 1 performs a lock screen operation on the computer according to the currently set lock screen mode, and the display terminal enters a lock screen shielding state, such as Figure 7 The figure shows the process of locking the display terminal screen.

[0047] The display terminal lock screen protection is mainly implemented through the first MCU controller module 1 in the hardware circuit design. The first MCU controller module 1 uses the CH559 model single-chip microcomputer, which can simulate the computer mouse and keyboard. Figure 8 As shown in the figure, the design principle of the display terminal lock screen protection is as follows: the DP and DM pins of the first MCU controller module 1 are connected to a USB Type A connector, which is connected to a computer via a USB cable and can be used as a mouse and keyboard of the computer; at the same time, the first MCU controller module 1 is connected to the host controller module 3 via the GPIO port, receives instructions from the host controller module 3, and executes the instructions of the host controller module 3 to lock the computer, shut down the computer, and perform other operations; at the same time, the first MCU controller module 1 is connected to the lock screen mode switching module via the GPIO port, and performs corresponding lock screen operations according to different signals received from the lock screen mode switching module; Figure 8 As shown, the external Download Header 2 of the MCU controller module 1 is used for firmware burning.

[0048] Among them, the lock screen mode is set by the SW1 button, and its circuit design is as follows Figure 9As shown, SW1 is a self-locking switch button with a default output state of high level. When the button is pressed, it outputs a low level. When the first MCU controller module 1 receives a high signal from the lock screen mode switching module 6, the computer is locked to the desktop; when the first MCU controller module 1 receives a low signal from the lock screen mode switching module 6, the computer is locked to a black screen.

[0049] Among them, the device has a built-in TF card storage module connector 7, which can store the relevant operation records of the device, risk images determined by the host controller module 3, etc. in the TF card storage module connector 7 according to actual needs. The device supports hot-swapping of TF cards to ensure that the device can read relevant information through the TF card when the power is off, the network is disconnected or the device is in an abnormal working state.

[0050] Among them, this device has an RJ45 network connector 8. When the device is connected to the network, it supports the access of multiple network camera modules and can adapt to different forms of display terminals. In actual application, different numbers of network cameras can be arranged according to actual conditions to meet the protection viewing angle and protection distance of the display terminal.

[0051] Unless otherwise specified, the embodiments of the present invention do not limit the models of the components. Any component that can perform the above functions may be used.

[0052] Those skilled in the art will understand that the accompanying drawings are only a schematic diagram of a preferred embodiment, and the serial numbers of the embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A display terminal anti-recording device with automatic power on / off detection, characterized in that: The device comprises: When the computer connected to the device is turned on, the computer outputs the video HDMI signal, the HDMI signal detection module sends the instruction of detecting the signal to the second MCU controller module, the second MCU controller module sends a high level to the host controller module, and the host controller module executes the power-on program; When the host controller module is powered on and enters a normal working state, the host controller module receives image information from the camera module in real time, identifies risky image information, and executes a screen lock operation on a computer connected to the device through the first MCU controller module; When the computer is shut down, the computer stops outputting HDMI video information, and the HDMI signal detection module sends an instruction that no signal is detected to the second MCU controller module. The second MCU controller module sends a low level to the host control module, and the host control module and the computer are shut down synchronously.

2. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The HDMI input connector is connected to a computer via an HDMI cable; the HDMI output connector is connected to an external display terminal via an HDMI cable; a camera module is provided on the display terminal, and the camera module is connected to a host controller module via a camera module connector.

3. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The first MCU controller module is connected to a computer via a USB output connector and a USB line, and serves as a mouse and keyboard of the peripheral computer.

4. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The lock screen operation is performed by the lock screen mode switching module. When the first MCU controller module receives a high-level signal from the lock screen mode switching module, it locks the computer screen to the desktop. When the first MCU controller module receives a low-level signal from the lock screen mode switching module, it executes a black screen lock operation on the computer.

5. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The device further includes a TF card storage module connector. The TF card storage module connector is used to store the recorded risk image determined by the host controller module and supports hot plugging.

6. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The device further comprises: an RJ45 network connector, wherein the RJ45 network connector supports network data transmission and network camera module expansion.

7. The display terminal anti-recording device with automatic power on / off detection according to claim 1, characterized in that: The host controller module supports simultaneous access to 16-channel network camera modules and supports one computer connecting to multiple display terminals, including security protection for display terminals of different types and sizes.

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