Emergency display control method, device and system of display and display

Abstract

The invention is applicable to the technical field of display control equipment, and provides an emergency display control method, device and system of a display and the display, the device comprises a power supply module and an information input module, the power supply module is connected with a power line and is used for supplying power to the information input module; the information input module comprises a decoding unit, a control unit, a data storage unit, a signal output unit and a display switching unit; the decoding unit is connected with a power line and the control unit, the signal output unit is connected with the control unit and the display, the display switching unit is connected with the control unit, and emergency display information is stored in the data storage unit. The method has the advantages that the emergency information can be played in the traditional non-intelligent display equipment to guide or prompt people to escape under the emergency condition without arranging an additional special data communication line or performing additional large-scale transformation on the display equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of display control devices, and particularly relates to an emergency display control method, device, system and display for a display. Background Art

[0002] For large public buildings such as stadiums that have short-term and large-flow evacuation requirements, there are special design layout requirements and guidelines for structure and fire protection regulations in architectural design to ensure the efficient and safe guidance of people into or out of the venue. For example, for the maximum evacuation distance (regardless of horizontal or vertical), the maximum and minimum distances between evacuation passage entrances and exits, etc., to ensure that the hard indicators of the evacuation passage can meet the requirements.

[0003] In an emergency state, warning devices and evacuation guidance devices need to be used to evacuate the audience inside the venue. Currently, the mainstream evacuation devices on the market mainly include the following categories:

[0004] Color zoning signs: Different evacuation areas are distinguished by seat colors and ground guiding lines (such as fluorescent green arrows). For example, the Bird's Nest uses 12 color blocks corresponding to 12 exits, and the audience in each area only needs to move following the same-color signs; hanging LED guiding screens that display the distance and direction to the nearest exit at the current position; electronic signs integrated with smoke sensors that automatically emit light to indicate the direction when a fire is detected.

[0005] However, the above-mentioned emergency indication devices have poor intelligence and are mostly dedicated escape devices. In a non-emergency state, their functions are limited, resulting in a certain degree of idle waste. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide an emergency display control method for a display, aiming to solve the problems that the emergency indication devices have poor intelligence and are mostly dedicated escape devices, and their functions are limited in a non-emergency state, resulting in a certain degree of idle waste.

[0007] The embodiments of the present application are implemented as follows. An emergency display control device for a display is provided, and the device includes:

[0008] A power supply module and an information input module. The power supply module is connected to the power line and is used to supply power to the information input module;

[0009] The information input module includes a decoding unit, a control unit, a data storage unit, a signal output unit, and a display switching unit;

[0010] The decoding unit is connected to the power line and the control unit, and is configured to obtain the high-frequency control signal in the power line, decode it to generate a low-frequency control signal, and input the low-frequency control signal into the control unit;

[0011] The signal output unit is connected to the control unit and the display, and is configured to provide a video signal input to the display;

[0012] The display switching unit is connected to the control unit, and is configured to switch the signal input source of the display between a normal video source and an emergency video source output by the signal output unit based on a switching instruction output by the control unit;

[0013] Emergency display information is stored in the data storage unit.

[0014] Another object of the embodiments of the present application is to provide an emergency display control method for a display, the method runs in the control unit of the emergency display control device as described above, and the method includes:

[0015] Obtain the low-frequency control signal;

[0016] When an emergency display start command is obtained from the low-frequency control signal, output a switching instruction to the display switching unit to switch the playback video source of the display from the normal video source to the emergency video source;

[0017] Wait for a preset response interval delay time;

[0018] Read the emergency display information, transcoding it into a video format and outputting it to the signal output unit;

[0019] When a stop emergency display command is obtained, output a switching instruction to the display switching unit to switch the playback video source of the display from the emergency video source to the normal video source.

[0020] Another object of the embodiments of the present application is to provide an emergency display control system for a display, the system includes a plurality of emergency display control devices of the display as described above and a control center;

[0021] The control center is configured to generate a low-frequency control signal, and modulate it into a high-frequency control signal and input it into the power line.

[0022] Another object of the embodiments of the present application is to provide a display, and the video signal input end of the display is connected to the emergency display control device of the display as described above in a wired manner.

[0023] An emergency display control device for a display provided by an embodiment of the present application has prominent advantages. This device upgrades a display that can be used daily into an escape guidance display device during emergencies. Without laying additional dedicated data communication lines and without large-scale additional transformation of the display device, it can play emergency information on traditional non-intelligent display devices during emergencies to guide or prompt people to escape. Therefore, the system layout does not require additional upgrading and transformation by adding a large number of exposed data cables in the building, nor does it require replacing old-model display devices, with low cost and convenient layout. The emergency display control device can be used as an independent modular device and can be used by connecting to a power supply. It can directly transform traditional non-intelligent display devices into intelligent emergency display terminals, and does not rely on a wireless network, avoiding a large amount of interference from signals in a complex wireless network environment, with better reliability and stronger versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an application environment diagram of an emergency display control device for a display provided by an embodiment of the present application;

[0025] Figure 2 It is a module diagram of an emergency display control device for a display provided by an embodiment of the present application;

[0026] Figure 3 It is a circuit schematic diagram of an emergency display control device for a display provided by an embodiment of the present application;

[0027] Figure 4 It is a flowchart of an emergency display control method for a display provided by an embodiment of the present application;

[0028] Figure 5 It is an internal structure block diagram of a computer device in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish one unit or module from another. For example, without departing from the scope of the present application, the first script can be called the second script, and similarly, the second script can be called the first script.

[0031] Figure 1The figure is an application environment diagram of the emergency display control method for the display provided by the embodiments of the present application. As Figure 1 shown, in this application environment, it includes a terminal device 110 and a control center 120.

[0032] The control center 120 can be an independent PLC controller, or an independent physical server, computer, physical server, and cloud server integrated with a controller and a coding device, etc., but is not limited thereto. The control center 120 can input the control signal carrier into the power line through the current power line carrier.

[0033] The terminal device 110 can be an independent control device or apparatus, and its output end is a video signal input line, which is connected to the display device. The terminal device 110 can also be a modular component, which is integrally installed inside the display device. The specific form of its existence is not limited in this application. The control center 120 and several terminal devices 110 can be connected and communicate through the power line.

[0034] As Figure 2 shown, in one embodiment, an emergency display control device for a display is proposed. This device can be Figure 1 the terminal device 110 in Figure 1 shown. As

[0035] shown, the device includes:

[0036] A power supply module and an information input module. The power supply module is connected to the power line and is used to supply power to the information input module. The information input module includes a decoding unit, a control unit, a data storage unit, a signal output unit, and a display switching unit; the decoding unit is connected to the power line and the control unit, and is used to obtain the high-frequency control signal in the power line and decode it to generate a low-frequency control signal, and input the low-frequency control signal into the control unit; the signal output unit is connected to the control unit and the display, and is used to provide a video signal input to the display; the display switching unit is connected to the control unit, and is used to switch the signal input source of the display between a conventional video source and an emergency video source output by the signal output unit based on the switching instruction output by the control unit; the data storage unit stores emergency display information.The advantage of the device provided in this embodiment is that there is no need to lay additional dedicated data communication lines, nor is it necessary to carry out additional large-scale transformation of the display device. In case of emergency, emergency information can be played on traditional non-intelligent display devices to guide or prompt people to escape. For example, for a traditional TV set in a hospital ward, even an old model display device without networking function can display emergency information when a fire occurs. The display device only needs to maintain the power connection status normally to start playing emergency information. Therefore, the system layout does not require upgrading and transformation by adding a large number of exposed data cables in the building, nor does it require replacing old model display devices, with low cost and convenient layout. The emergency display control device can be used as an independent modular device and can be used after being connected to the power supply. It can directly convert traditional non-intelligent display devices into intelligent emergency display terminals, and does not rely on wireless networks, avoiding a large amount of interference from signals in complex wireless network environments, with better reliability and stronger versatility.

[0037] In this embodiment, since the power supply module is directly connected to the AC power line, it at least includes a rectification and filtering module and a voltage transformation module to convert AC into DC voltage required by other units and provide standard voltages such as +5V, -5V, and 12V. The decoding unit uses a power line carrier modem, such as the ST7540 model, to achieve content communication and input the modulated signal into the control unit. Signal extraction can be achieved by using a CBB capacitor to form an AC coupling network, etc. This application does not list them all here. As known to those skilled in the art, this module may also include a SAW filter and several operational amplifiers to assist in realizing functions. Only the most core functional modules are pointed out here. The control unit can use a low-end or high-end single-chip microcomputer or controller such as STM32 to obtain emergency information playback performance required at different levels. The data input signal line of the decoding unit is connected to the signal input port of the control chip in the control unit. Two clock pins of the control chip also need to be connected to the crystal oscillator clock circuit to achieve delay timing and delay functions. As known to those skilled in the art, the specific connection relationship between chip pins can be obtained by referring to the technical manual of the chip. This application does not limit this. The control unit can read the stored data in the data storage unit and convert it into a video format, or use a dedicated video encoding chip on a high-end control chip to convert the emergency information into a video and output it through the signal output unit. The signal output unit can be provided with standard video output interfaces such as VGA and DP to adapt to the vast majority of traditional non-intelligent display devices.

[0038] The data storage unit can adopt a flash memory, a ROM or a RAM memory, which is not limited in this application. The emergency display information stored therein can be pictures, audio, video, text, etc. It can be understood that under the instruction of the control unit, the emergency display information can be output through interfaces such as HDMI and VGA, and then directly input into the display through an adapter cable. One corresponding emergency display control device can be installed on each display. The switching instruction is used to control the display to switch the video playback source. The conventional video source can be cable TV programs, videotapes, etc., and the emergency video source is the output source of the video signal of the device provided in this application.

[0039] In this embodiment, the control center can control a large number of emergency display control devices to start or stop playing emergency information through power line carrier, so it can be applied to various large venues without upgrading traditional equipment or venues.

[0040] As a preferred embodiment of this application, the display switching unit includes an infrared controller and / or a wired controller.

[0041] In this embodiment, the display switching unit can be an infrared controller and / or a wired controller. The infrared controller is an infrared remote control. Since the signal switching commands of different models of displays correspond to different infrared remote control waveforms, the infrared controller can output corresponding waveforms based on the actual situation to correspondingly control the corresponding display device to achieve signal source switching.

[0042] Preferably, for most TVs or display devices, they all contain a signal switching switch, which is used to change the signal input source of the display. For example, it can switch alternately among VGA input, HDMI input, USB input, and copper wire input. Therefore, the conduction times can be preset based on different TV brands to enable the display to switch back and forth between the emergency video source and the ordinary video source for playback. For devices without an infrared receiver, a wired controller can be used for control.

[0043] As a preferred embodiment of this application, the wired controller includes a first short-circuit terminal and a second short-circuit terminal, and the first short-circuit terminal and the second short-circuit terminal are respectively used to connect to both ends of the signal source switching switch of the display; after receiving the switching instruction, the first short-circuit terminal and the second short-circuit terminal are conducted a preset number of times to short-circuit the signal source switching switch several times.

[0044] After receiving the switching instruction, the first short-circuit terminal and the second short-circuit terminal are conducted a preset number of times, which causes the signal source switching switch on the display to be short-circuited several times, simulating the manual click and press conduction switching by the user.

[0045] In one embodiment, as Figure 3As shown, a control circuit module diagram of a specific emergency display control device is provided. In this embodiment, the display switching unit uses a pulse short-circuit switch. When the control chip of the control unit outputs a high-voltage pulse, the corresponding switch is short-circuited once.

[0046] In an embodiment of the present application, as Figure 4 shown, an emergency display control method for a display is also proposed. This embodiment mainly takes the application of this method to the above terminal as an example for illustration. An emergency display control method for a display may specifically include the following steps:

[0047] Step S10, obtain the low-frequency control signal.

[0048] Step S20, when the start emergency display command is obtained from the low-frequency control signal, output a switching instruction to the display switching unit to switch the playing video source of the display from the normal video source to the emergency video source.

[0049] In this embodiment, the obtained low-frequency signal is analyzed. Since there may be clutter, etc. in the signal, only when the start emergency display command is obtained from the low-frequency control signal, then output a switching instruction to the display switching unit. Make the display switch from the normal display state to the emergency display state and play emergency information.

[0050] Step S30, wait for a preset response interval delay time.

[0051] In this embodiment, the preset response interval delay time is generally several seconds, which is used to wait for the completion of the display signal source switching.

[0052] Step S40, read the emergency display information, transcode it into a video format and output it to the signal output unit.

[0053] Step S50, when the stop emergency display command is obtained, output a switching instruction to the display switching unit to switch the playing video source of the display from the emergency video source to the normal video source.

[0054] In this embodiment, the emergency display information is played in a loop until the stop emergency display command is obtained, and the display content of the display is switched back to the normal state.

[0055] The advantages of the method provided in the embodiments of the present application are as follows: Without laying additional dedicated data communication lines and without large-scale additional transformation of the display device, emergency information can be played on traditional non-intelligent display devices in case of emergency to guide or prompt people to escape. For example, for a traditional TV set in a hospital ward, when a fire occurs, even an old model display device without networking function can display emergency information. The display device only needs to maintain the power connection state normally to start playing the emergency information. Therefore, the system deployment does not require additional upgrading and transformation of adding a large number of exposed data cables in the building, nor does it require replacing old model display devices, with low cost and convenient deployment. The emergency display control device can be used as an independent modular device and can be used after being connected to the power supply. It can directly convert traditional non-intelligent display devices into intelligent emergency display terminals, and does not rely on wireless networks, avoiding a large amount of interference of signals in complex wireless network environments, with better reliability and stronger versatility.

[0056] In a preferred embodiment, the method further includes:

[0057] A number of emergency display information stored in the data storage unit are provided, and each piece of emergency display information corresponds to a unique content code;

[0058] Obtain the content instruction code included in the low-frequency control signal;

[0059] Obtain the relationship mapping table between the content instruction code and the content code, transcode the emergency display information under the content code corresponding to the content instruction code into a video format, and output it to the signal output unit for playback.

[0060] In the embodiments of the present application, considering that more information can be included in the data string of power line carrier, specific corresponding content of emergency display to be played can be placed in the data string to cope with different types of emergency situations. For example, in different situations such as fire, earthquake, air raid, drill, etc., different emergency display contents can be played, so as to give users more sufficient psychological preparation and avoid causing blind panic among users.

[0061] In a preferred embodiment, the method further includes:

[0062] Obtain the device identification code built in the emergency display control device;

[0063] Obtain the device instruction code included in the low-frequency control signal and the content code corresponding to the device instruction code;

[0064] Judge whether the device identification code of the current device matches the device instruction code;

[0065] When the judgment result is a successful match, the emergency display information under the content encoding corresponding to the device instruction code is transcoded into a video format and output to the signal output unit for playback.

[0066] In the embodiment of the present application, the present application further considers that for large venues, their areas are large, and for example, fires may not spread to the entire venue. Therefore, the identification code of the device can be used to specifically control the display devices in local positions and local floors to perform emergency displays. That is, the device identification code built into the emergency display control device can be unique or shared by the same position on the same floor. When an emergency state is started, individual, regional, or collective differential control can be performed. Or based on the time sequence, the control center starts each terminal device batch by batch and position by position for differential control to achieve hierarchical evacuation and avoid crowded stampedes.

[0067] In a preferred embodiment, the device instruction code can be used as an emergency state start instruction, that is, as long as it is determined that the device identification code of the current device matches the device instruction code, the emergency display information is directly transcoded into a video format for video or content playback.

[0068] In a preferred embodiment, the emergency display information includes an emergency escape route map guide for the location where the current device is located.

[0069] In the embodiment of the present application, further considering to improve the pertinence and efficiency of the escape guide, the data storage unit in the emergency display control device of each different display can store differential emergency escape route map videos for guidance.

[0070] In a preferred embodiment, an emergency display control system for a display is provided. The system includes a plurality of emergency display control devices for the displays as described above and a control center;

[0071] The control center is used to generate a low-frequency control signal and modulate it into a high-frequency control signal and input it into the power line.

[0072] In the embodiment of the present application, the reason for converting the low-frequency control signal into a high-frequency one is that the low-frequency waveform is extremely prone to loss and distortion, and its propagation distance is too short to control a large number of remote devices, thus making it difficult to achieve data communication.

[0073] The advantages of this system are that there is no need to lay additional dedicated data communication lines, nor to carry out additional large-scale transformation of display devices. In case of emergency, emergency information can be played on traditional non-intelligent display devices to guide or prompt people to escape. For example, for a traditional TV set in a hospital ward, when a fire breaks out, even an old model display device without an Internet connection function can display emergency information. The display device only needs to maintain the normal power connection status to start playing the emergency information. Therefore, the system layout does not require upgrading and transformation by adding a large number of exposed data cables in the building, nor does it require replacing old model display devices, with low cost and convenient layout. The emergency display control device can be used as an independent modular device and can be used by connecting to the power supply. It can directly transform traditional non-intelligent display devices into intelligent emergency display terminals, and does not rely on a wireless network, avoiding a large amount of interference from signals in a complex wireless network environment, with better reliability and stronger versatility.

[0074] In a preferred embodiment, a display is provided, and the video signal input end of the display is connected to the emergency display control device of the display as described above in a wired manner.

[0075] In the embodiment of the present application, the display can be controlled by the instructions of the control device to play corresponding content.

[0076] In the embodiment of the present application, the explanation and description of the above display can refer to the explanation and description of the corresponding method above. The advantages of this display are that there is no need to lay additional dedicated data communication lines, nor to carry out additional large-scale transformation of display devices. In case of emergency, emergency information can be played on traditional non-intelligent display devices to guide or prompt people to escape. For example, for a traditional TV set in a hospital ward, when a fire breaks out, even an old model display device without an Internet connection function can display emergency information. The display device only needs to maintain the normal power connection status to start playing the emergency information. Therefore, the system layout does not require upgrading and transformation by adding a large number of exposed data cables in the building, nor does it require replacing old model display devices, with low cost and convenient layout. The emergency display control device can be used as an independent modular device and can be used by connecting to the power supply. It can directly transform traditional non-intelligent display devices into intelligent emergency display terminals, and does not rely on a wireless network, avoiding a large amount of interference from signals in a complex wireless network environment, with better reliability and stronger versatility.

[0077] Figure 5 The internal structure diagram of a computer device in an embodiment is shown. The computer device can specifically be Figure 1 the control center 120 in. As Figure 5As shown, the computer device includes a processor, a memory, a network interface, an input device, and a display screen connected via a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the emergency display control method of the display. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can execute the emergency display control method of the display. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the outer shell of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0078] Those skilled in the art can understand that Figure 5 the structure shown in is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0079] In one embodiment, the emergency display control method of the display provided by this application can be implemented in the form of a computer program. The computer program can run on a terminal device as shown in Figure 1 or run in a CPU module as shown in Figure 3 The computer program composed of each program module enables the processor to execute the steps in the emergency display control method of the display in each embodiment of this application described in this specification.

[0080] In the embodiments of this application, for the description of the above-mentioned emergency display control method of the display, please refer to the above text and will not be elaborated here.

[0081] It should be understood that although the steps in the flowcharts of the embodiments of this application are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in each embodiment may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0082] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0083] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0084] The above embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An emergency display control device for a display, characterized in that, The device includes: A power supply module and an information input module. The power supply module is connected to the power line and is used to supply power to the information input module. The information input module includes a decoding unit, a control unit, a data storage unit, a signal output unit, and a display switching unit. The decoding unit is connected to the power line and the control unit, and is used to obtain the high-frequency control signal in the power line, decode it to generate a low-frequency control signal, and input the low-frequency control signal into the control unit. The signal output unit is connected to the control unit and the display, and is used to provide video signal input to the display. The display switching unit is connected to the control unit, and is used to switch the signal input source of the display between a normal video source and an emergency video source output by the signal output unit based on the switching instruction output by the control unit. Emergency display information is stored in the data storage unit.

2. The emergency display control device for a display according to claim 1, wherein The display switching unit includes an infrared controller and / or a wired controller.

3. The emergency display control device for a display according to claim 2, characterized in that The wired controller includes a first short-circuit terminal and a second short-circuit terminal, and the first short-circuit terminal and the second short-circuit terminal are respectively used to be connected to both ends of the signal source switching switch of the display. After receiving the switching instruction, the first short-circuit terminal and the second short-circuit terminal are conducted a preset number of times.

4. An emergency display control method for a display, characterized in that, The method runs in the control unit of the emergency display control device according to any one of claims 1-3. The method includes: Obtaining the low-frequency control signal. When an emergency display start command is obtained from the low-frequency control signal, output a switching instruction to the display switching unit to switch the playback video source of the display from a normal video source to an emergency video source. Wait for a preset response interval delay time. Read the emergency display information, transcode it into a video format, and output it to the signal output unit. When a stop emergency display command is obtained, output a switching instruction to the display switching unit to switch the playback video source of the display from an emergency video source to a normal video source.

5. The emergency display control method of a display according to claim 4, wherein, The method further includes: There are several pieces of emergency display information stored in the data storage unit, and each piece of emergency display information corresponds to a unique content code. Obtain the content instruction code included in the low-frequency control signal. Obtain the relationship mapping table between the content instruction code and the content code, transcode the emergency display information under the content code corresponding to the content instruction code into a video format, and output it to the signal output unit for playback.

6. The emergency display control method for a display according to claim 5, characterized in that, The method further includes: Obtain the device identification code built in the emergency display control device. Obtain the device instruction code included in the low-frequency control signal and the content code corresponding to the device instruction code. Judge whether the device identification code of the current device matches the device instruction code. When the judgment result is a successful match, transcode the emergency display information under the content code corresponding to the device instruction code into a video format, and output it to the signal output unit for playback.

7. The emergency display control method of a display according to claim 4, wherein The emergency display information includes a guide map of the emergency escape route of the current device's location.

8. An emergency display control system for a display, characterized in that, The system includes an emergency display control device for several monitors as described in any one of claims 1 to 3, and a control center; The control center is used to generate a low-frequency control signal and modulate it into a high-frequency control signal for input into the power line.

9. A display, characterized in that, The video signal input terminal of the monitor is connected in a wired manner to the emergency display control device for the monitor as described in any one of claims 1 to 3.

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