Outdoor machine cholesteric phase electronic paper control system and control method

Abstract

The application discloses an outdoor cholesteric phase electronic paper control system and a control method, relates to the field of electronic paper, and solves the problems of poor environmental adaptability, insufficient display reliability, high overall power consumption of the system, and insufficient standby endurance. Through the setting of a power switch circuit, the power supply path of a display module and a front light module is physically cut off instead of being cut off by software when a picture brushing task is completed and there is no new task, the system enters a standby mode by utilizing the bistable characteristics of the cholesteric phase electronic paper, and low-power operation is realized. An ambient light sensor is arranged to sense the change in light intensity, and a human proximity sensor is arranged to sense whether a person exists, so as to distinguish scenes such as an environment being dark but having a person, the environment being dark and having no person, etc., ensure readability in a weak light environment, avoid invalid illumination when no one is watching, realize on-demand opening of the front light and stepwise adjustment of the brightness, instead of always being closed or blindly opened at the highest brightness, and reduce power consumption under the premise of ensuring visibility.

Description

Technical Field

[0001] This application relates to the field of electronic paper, and in particular to an outdoor cholesteric electronic paper control system and control method. Background Technology

[0002] Cholesteric liquid crystal electronic paper (ChLCD Electronic Paper) has broad application prospects in the field of outdoor information terminals due to its bistable, reflective display, and sunlight-readable characteristics.

[0003] In real-world outdoor environments, the dynamic range of outdoor light intensity is extremely wide. Cholesteric electronic paper, however, does not emit light itself and relies on ambient light reflection for imaging. In low-light conditions such as dawn, dusk, and overcast skies, its reflective display principle causes a sharp drop in screen brightness, resulting in extremely poor readability. To compensate for this deficiency, a simple front light source is typically configured, but this lacks precise control, leading to either unclear display in low light or the blind activation of high-brightness front lights, causing unnecessary energy consumption. Furthermore, outdoor terminals are often in a static, uninterrupted display state for extended periods, yet currently, core components such as the main control unit, communication module, and display driver maintain constant power supply even when not in use, generating significant idle power consumption.

[0004] Therefore, providing a control scheme that can adapt to complex outdoor environments and ensure reliable all-weather display while maintaining ultra-low system power consumption is a technical problem that urgently needs to be solved by those in the field. Summary of the Invention

[0005] The purpose of this application is to provide an outdoor cholesteric electronic paper control system and control method to solve the problems of poor environmental adaptability, insufficient display reliability, high overall system power consumption, and insufficient standby battery life.

[0006] To address the aforementioned technical problems, this application provides an outdoor cholesteric electronic paper control system, comprising: a control unit, a display module, an ambient light sensor for acquiring light intensity values, a human proximity sensor for acquiring detection distance values, a front light module, and a power switch circuit; the front light module includes a front light source and a front light driving circuit. The control unit is connected to the ambient light sensor, the human proximity sensor, the display module, the control terminal of the front light driving circuit, and the control terminal of the power switch circuit, respectively; the power switch circuit is connected to the display module and the front light module for connecting to a power source. The control unit controls the activation and brightness adjustment of the front light module based on the light intensity value sent by the ambient light sensor and the detection distance value sent by the human proximity sensor; and when the image brushing task of the display module is completed and no new image brushing command is input, the control unit controls the power switch circuit to disconnect, cuts off the power supply to the display module and the front light module, and enters standby mode.

[0007] Optionally, the above-mentioned outdoor unit cholesteric electronic paper control system also includes: a temperature sensor, a fan switch circuit, and a fan; The temperature sensor is mounted on the back circuit board of the display module. The fan is located on the side wall or back heat dissipation grille of the electronic paper; The temperature sensor is connected to the control unit, the control terminal of the fan switch circuit is connected to the control unit, the input terminal of the fan switch circuit is connected to the power supply, and the output terminal of the fan switch circuit is connected to the fan. The control unit receives the temperature value sent by the temperature sensor. When the temperature value is higher than a preset temperature threshold, it controls the fan switch circuit to turn on. In standby mode, the control unit controls the fan switch circuit to turn off.

[0008] Optionally, the above-mentioned outdoor unit cholesteric electronic paper control system also includes: a door magnetic sensor; The door magnetic sensor includes a wireless transmitter disposed inside the housing and a permanent magnet disposed on the maintenance door; The wireless transmitter is connected to the control unit and is used to send a signal to the control unit when the maintenance door is detected to be open.

[0009] Optionally, the above-mentioned outdoor cholesteric electronic paper control system also includes: a storage battery, a solar charging module, and a voltage sampling circuit; The solar charging module is disposed on the outer surface of the electronic paper, and the battery is disposed in the internal cavity of the electronic paper; the solar charging module is used to collect solar energy to charge the battery; The voltage sampling circuit is connected to the battery and the control unit, and is used to collect the voltage value of the battery and send it to the control unit.

[0010] To address the aforementioned technical problems, this application also provides a cholesteric electronic paper control method for outdoor cameras, applied to a cholesteric electronic paper control system for outdoor cameras. The outdoor camera cholesteric electronic paper control system includes: a control unit, a display module, an ambient light sensor for acquiring light intensity values, a human proximity sensor for acquiring detection distance values, a front light module, and a power switch circuit. The front light module includes a front light source and a front light driving circuit. The control unit is connected to the control terminals of the ambient light sensor, the human proximity sensor, the display module, the front light driving circuit, and the power switch circuit, respectively. The power switch circuit is connected to the display module and the front light module for connecting to a power source. The method includes: Receives the light intensity value sent by the ambient light sensor and the detection distance value sent by the human proximity sensor; Adjust the front light module's activation and brightness based on the light intensity value and the detection distance value; Monitor the image-brushing task status of the display module, and determine whether a new image-brushing instruction has been received after the display module completes the current image-brushing task; If no new image refresh command is received, the power switch circuit is turned off, cutting off the power supply to the display module and the front light module before entering standby mode.

[0011] Optionally, in the above-mentioned outdoor cholesteric electronic paper control method, adjusting whether the front light module is turned on and the brightness of the front light module according to the light intensity value and the detection distance value includes: Determine whether the light intensity value is lower than a first threshold; If not, control the front light module to turn off; If so, determine whether the duration of the light intensity value being lower than the first threshold exceeds the first duration; If the brightness exceeds the limit, control the front light module to turn on in the first brightness mode; If it does not exceed the threshold, then determine whether the detection distance value is less than the second threshold. If the brightness is less than the specified value, the front light module is controlled to turn on in the second brightness mode. If the brightness is not less than the second brightness mode, the front light module is controlled to turn on in the third brightness mode; wherein the brightness value of the third brightness mode is lower than that of the second brightness mode.

[0012] Optionally, in the above-mentioned outdoor unit cholesteric electronic paper control method, the first brightness mode and the second brightness mode are: dynamic adjustment mode; The third brightness mode is a fixed brightness mode; The method further includes: In the third brightness mode, if the target is detected to have left the detection range based on the detection distance value, the front light module is controlled to turn off.

[0013] Optionally, in the above-mentioned outdoor cholesteric electronic paper control method, monitoring the image-brushing task status of the display module, and determining whether a new image-brushing instruction has been received after the display module completes the current image-brushing task, includes: Monitor the progress of the image-brushing task of the display module; When the map-clearing task is detected as complete, start the delay counter; If no new refresh command is received during the counting period of the delay counter, it is determined that no new refresh command has been received and proceeds to the next step.

[0014] Optionally, in the above-mentioned outdoor unit cholesteric electronic paper control method, the outdoor unit cholesteric electronic paper control system further includes: a door magnetic sensor; the method further includes: The maintenance door opening signal sent by the door magnetic sensor was received; An alarm signal is generated and sent to the remote monitoring platform via a wireless communication module.

[0015] Optionally, in the above-mentioned outdoor cholesteric electronic paper control method, the outdoor cholesteric electronic paper control system further includes: a battery and a voltage sampling circuit; the voltage sampling circuit is connected to the battery and the control unit; the method further includes: The voltage value of the battery is acquired by the voltage sampling circuit and output to the display module for visual display. Determine whether the current voltage value is lower than a preset power threshold; If so, reduce the brightness of the front light module.

[0016] The outdoor cholesteric electronic paper control system provided in this application, through the setting of the power switch circuit, physically cuts off the power supply path of the display module and the front light module instead of cutting it off by software when the image-brushing task is completed and there is no new task. It utilizes the bistable characteristics of cholesteric electronic paper to put the system into standby mode and achieve low power consumption operation. By setting an ambient light sensor to detect changes in light intensity and a human proximity sensor to detect the presence of people, it can distinguish between dark but occupied environments and dark but unoccupied environments, ensuring readability in low-light environments and avoiding ineffective lighting when no one is watching. It enables the front light to be turned on as needed and the brightness to be adjusted in stages, rather than being always off or blindly turned on at the highest brightness, thereby reducing power consumption while ensuring visibility.

[0017] In addition, this application also provides a cholesteric phase electronic paper control method for outdoor cameras, which corresponds to the above-mentioned cholesteric phase electronic paper control method system for outdoor cameras and has the same effect. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an outdoor cholesteric electronic paper control system provided in this application; Figure 2 A schematic diagram of a control display module provided in this application; Figure 3 A sampling schematic diagram of an ambient light sensor provided in this application; Figure 4 This application provides a control schematic diagram of a front light driving circuit; Figure 5 A control diagram of a fan provided in this application; Figure 6 A schematic diagram of temperature monitoring provided in this application; Figure 7 This application provides a control schematic diagram of a door magnetic sensor; Figure 8 A flowchart of a cholesteric electronic paper control method for an outdoor machine provided in this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0021] The core of this application is to provide an outdoor cholesteric electronic paper control system and control method.

[0022] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This application provides an outdoor cholesteric electronic paper control system, such as... Figure 1 As shown, it includes: a control unit 11, a display module 12, an ambient light sensor 13 for collecting light intensity values, a human proximity sensor 14 for collecting detection distance values, a front light module 15, and a power switch circuit 16; the front light module includes a front light source and a front light driving circuit. The control unit 11 is connected to the control terminal of the ambient light sensor 13, the human proximity sensor 14, the display module 12, the control terminal of the front light driving circuit, and the control terminal of the power switch circuit 16, respectively; the power switch circuit 16 is connected to the display module 12 and the front light module 15 for connecting to the power supply. The control unit 11 controls the opening and brightness adjustment of the front light module 15 based on the light intensity value sent by the ambient light sensor 13 and the detection distance value sent by the human proximity sensor 14. Furthermore, when the display module 12 completes its image-brushing task and no new image-brushing command is input, the control unit 11 controls the power switch circuit 16 to disconnect, cutting off the power supply to the display module 12 and the front light module 15, and then enters standby mode.

[0024] The control unit 11 mentioned in this embodiment is the control core of the entire system. It can be a microcontroller unit (MCU), embedded processor, digital signal processor (DSP), or field-programmable gate array (FPGA) or other device with data processing and logic judgment capabilities. In this embodiment, the control unit 11 preferably adopts an ultra-low power MCU. The control unit 11 integrates peripheral circuits such as analog-to-digital converter (ADC), general-purpose input / output interface (GPIO), and serial communication interface for data interaction with various sensors and actuators. The function of the control unit 11 is to receive detection signals from ambient light sensor 13 and human proximity sensor 14, make judgments and decisions according to preset control logic, and then output corresponding control commands to actuators such as forward light drive circuit and power switch circuit 16.

[0025] Display module 12 is the cholesteric liquid crystal electronic paper display module. Cholesteric liquid crystal is a liquid crystal material with bistable properties. Bistableness means that after the external electric field is removed, the liquid crystal molecules can stably remain in either a reflective state (bright state) or a transmissive state (dark state), maintaining the image without continuous power supply. This characteristic allows cholesteric electronic paper to consume almost no power during the static display stage after refresh. Display module 12 typically includes: a display panel, a driver chip, a flexible printed circuit board (FPC), and a backplane circuit. Display module 12 is connected to control unit 11 via a parallel or serial interface to receive image data to be displayed. Figure 2 As shown, the control unit outputs a pulse width modulation (PWM) signal to control the host electronic switch M1 to control whether the display mode is turned on.

[0026] An ambient light sensor 13 is used to collect ambient light intensity values. Its core components can be a photodiode, a photosensitive element, or an integrated digital ambient light sensor chip. The ambient light sensor 13 can convert the intensity of visible light from the outside environment into an electrical signal, such as... Figure 3As shown, REF typically represents the reference voltage, WD_AD is the analog signal output terminal, usually connected to the ADC (analog-to-digital converter) pin of the microcontroller, and the resistance value of the photosensitive element P1 changes with the light intensity. In this embodiment, the ambient light sensor 13 is preferably a digital output sensor, connected to the control unit 11 via an I2C bus, directly outputting the light intensity value in lux (lx). The function of the ambient light sensor 13 is to sense the changes in the brightness of the outdoor environment in real time, providing the control unit 11 with a decision-making basis for determining whether to turn on the front light supplement.

[0027] The human proximity sensor 14 is used to collect detection distance values, that is, to detect whether a person is approaching and the distance of the approach. In a preferred embodiment of the present invention, the human proximity sensor 14 is a millimeter-wave radar sensor or an infrared sensor. The human proximity sensor 14 can also be an ultrasonic sensor or a laser rangefinder sensor. This embodiment does not impose strict limitations.

[0028] The front light module 15 includes a front light source and a front light driving circuit. The front light source typically uses LED strips or LED arrays, positioned around or on one side of the screen of the electronic paper display module 12, and uses a light guide plate to evenly guide light onto the entire display surface. Since cholesteric electronic paper itself does not emit light, the front light module 15 is needed to provide illumination in low-light environments so that users can see the displayed content. The front light driving circuit is the electronic circuit used to drive the front light source. For example... Figure 4 As shown, the control terminal (PWM signal) of the drive circuit is connected to the IO port of the control unit 11. By receiving the PWM (pulse width modulation) signal or high and low level signal output by the control unit 11, the stepless adjustment of the front light brightness is realized.

[0029] The power switch circuit 16 is an electronic switch circuit located between the external power supply and the display module 12 and the front light module 15. For example... Figure 4 As shown, the control terminal of the power switch circuit 16 is connected to the control unit 11. Its input terminal is used to connect to an external power source (which can be a DC power supply from an AC adapter or a DC power supply from a battery). Its output terminal is connected to the power supply pins of the display module 12 and the front light module 15, respectively. In this embodiment, the power switch circuit 16 preferably uses a MOSFET (metal-oxide-semiconductor field-effect transistor) as the switching element. Figure 4The front photoelectric switch M2 is used in the control unit 11. A MOSFET is a voltage-controlled device whose gate is connected to the I / O port of the control unit 11. When the I / O port of the control unit 11 outputs a high level, the MOSFET is turned on, and the external power supply supplies power to the display module 12 and the front photoelectric module 15; when the I / O port outputs a low level, the MOSFET is turned off, physically cutting off the power supply circuit. A MOSFET is used instead of a mechanical relay because MOSFETs have advantages such as low on-resistance, fast switching speed, no mechanical wear, and extremely low power consumption, making them suitable for use in low-power systems requiring frequent switching.

[0030] Specifically, the ambient light sensor 13 and the human proximity sensor 14 are disposed on the front housing of the electronic paper device and located in the visible area of ​​the display module 12. Considering the accuracy requirements of sensor detection, the ambient light sensor 13 is used to detect the intensity of ambient light perceived by the viewer. If it were installed on the back or side of the device, the light intensity detected by the sensor might deviate from the actual illuminance on the front of the screen (e.g., the sensor is obstructed or facing a shadow). By disposing the ambient light sensor 13 on the front housing and within the visible area of ​​the display module 12 (i.e., around the screen or in one corner), aligning it with the user's viewing direction, it ensures that the light intensity value collected by the sensor accurately reflects the lighting conditions when the user is viewing, thus avoiding false activation or deactivation of the front light due to detection deviations. The human proximity sensor 14 (especially millimeter-wave radar) is mounted on the front housing and within the visible area, allowing its detection beam's main lobe to face the area in front of the device, i.e., the space where the user might be present. This optimizes the detection angle, reduces blind spots, and improves the accuracy of recognizing user approach behavior.

[0031] In fact, this embodiment does not require the ambient light sensor 13 and the human proximity sensor 14 to be installed in a specific location; they can be installed in any location that can collect light intensity values ​​and detect distance values.

[0032] The control unit 11 controls the activation and brightness adjustment of the front light module 15 based on the light intensity value sent by the ambient light sensor 13 and the detection distance value sent by the human proximity sensor 14. The control unit 11 integrates information from both light intensity and distance to form a multi-dimensional decision-making logic. For example, if the ambient light intensity is much higher than a threshold (e.g., >300 lx), the control unit 11 determines that no supplementary lighting is needed, and the front light module 15 remains off. If the ambient light intensity is lower than the threshold, but the human proximity sensor 14 detects no one in front (or at a great distance, e.g., >2 meters), the control unit 11 controls the front light module 15 to activate at extremely low brightness (e.g., 2% brightness), or temporarily disables the front light after considering energy consumption strategies. This avoids unnecessary power consumption when the display is unattended and allows for rapid response when someone approaches. If the ambient light intensity is lower than the threshold, and the human proximity sensor 14 detects someone entering the vicinity (e.g., <2 meters), the control unit 11 controls the front light module 15 to activate and dynamically adjust to a suitable brightness to ensure a good visual experience for the user.

[0033] When the image refresh task of the display module 12 is completed and no new refresh command is input, the control unit 11 controls the power switch circuit 16 to disconnect, cutting off the power supply to the display module 12 and the front light module 15, and then enters standby mode. The image refresh task refers to the process by which the display module 12 receives and executes image data update commands from the host computer or internal memory, typically including three stages: data transmission, image rendering, and refresh display. Because cholesteric electronic paper has bistable characteristics—meaning that once the image refresh is complete, the displayed content remains unchanged even if the power is completely cut off—it is unnecessary to continue supplying power to the display module 12 and the front light module 15 after the image refresh task is completed; this would only result in unnecessary energy consumption.

[0034] In this embodiment, the control unit 11 does not immediately power off after detecting the completion of the image brushing task. Instead, it first determines whether there are any new image brushing instructions waiting or about to arrive. If it is confirmed that there are no new instructions input (for example, no new instructions are received after the delay counter expires), the control unit 11 outputs a low level (shutdown signal) to the power switch circuit 16, cutting off the power supply circuit of the display module 12 and the front light module 15. At this time, the entire system enters a deep standby mode. The control unit 11 itself may still continue to work (to maintain functions such as timed wake-up and sensor polling), but the display module 12 and the front light module 15 are completely powered off, and power consumption is reduced to a minimum.

[0035] The outdoor cholesteric electronic paper control system provided in this application, through the setting of the power switch circuit 16, physically cuts off the power supply path of the display module 12 and the front light module 15 when the image-brushing task is completed and there is no new task, rather than cutting it off by software. It utilizes the bistable characteristics of cholesteric electronic paper to put the system into standby mode and achieve low power consumption operation. By setting an ambient light sensor 13 to detect changes in light intensity and setting a human proximity sensor 14 to detect the presence of people, it can distinguish between scenarios such as dark environment with people and dark environment without people, ensuring readability in low light environment and avoiding ineffective lighting when no one is watching. It realizes that the front light is turned on as needed and the brightness is adjusted in stages, rather than always being turned off or blindly turning on the highest brightness, thereby reducing power consumption while ensuring visibility.

[0036] Specifically, it also includes: temperature sensor 19, fan switch circuit 17, and fan 18; Temperature sensor 19 is mounted on the back circuit board of display module 12; The fan 18 is located on the side wall or back heat dissipation grille of the electronic paper; Temperature sensor 19 is connected to control unit 11, control terminal of fan switch circuit 17 is connected to control unit 11, input terminal of fan switch circuit 17 is connected to power supply, and output terminal of fan switch circuit 17 is connected to fan 18. The control unit 11 receives the temperature value sent by the temperature sensor 19. When the temperature value is higher than the preset temperature threshold, it controls the fan switch circuit 17 to be turned on. In standby mode, the control unit 11 controls the fan switch circuit 17 to be turned off.

[0037] Temperature sensor 19 is located on the back circuit board of display module 12. It should be noted that although the power consumption of the cholesteric electronic paper display module 12 is much lower than that of light-emitting displays such as LCDs, heat may still accumulate in the electronic paper material and driver chip under conditions of continuous high-density image display for extended periods (such as direct sunlight at midday outdoors). Especially in hot summer weather, the internal temperature of the device may rise above 50°C. Excessive temperature can accelerate the aging of the liquid crystal material, affect photoelectric response characteristics, and even shorten the device's lifespan. Therefore, it is necessary to monitor the temperature of display module 12 in real time.

[0038] The temperature sensor 19 is placed on the back circuit board of the display module 12 to bring the sensor as close as possible to the heat source (the display module 12 itself) to obtain the most accurate temperature data. In fact, the temperature sensor 19 can be directly soldered to the FPC (flexible printed circuit board) of the display module 12, or it can be attached to the metal shielding layer of the back plate of the display module 12 with thermally conductive adhesive.

[0039] Fan 18 is located on the side wall or back of the electronic paper near the heat dissipation grille. The function of fan 18 is to expel heat from inside the device through forced air convection. Because outdoor devices need to be waterproof and dustproof, large ventilation holes are typically not created on the casing; instead, a combination of localized heat dissipation grilles and a waterproof, breathable membrane is used. The air outlet of fan 18 should face the heat dissipation grille to blow hot air out of the device.

[0040] The fan switch circuit 17 has its control terminal connected to the control unit 11, its input terminal connected to the power supply (i.e., the system's main power supply, which can be a battery, external power source, or AC power), and its output terminal connected to the fan 18. Similar to the power switch circuit 16, as... Figure 5 As shown, the fan switch circuit 17 preferably uses a MOSFET electronic switch (i.e., fan electronic switch M3), which is directly controlled by the IO port of the control unit 11. Figure 2 , Figure 4 , Figure 5 In the text, Vin represents the input voltage. Figure 3 , Figure 6 , Figure 7 The serial numbers 1, 2, 3, and 4 are used to distinguish circuit ports and are not used as component markers.

[0041] The control unit 11 receives the temperature value sent by the temperature sensor 19. When the temperature value is higher than a preset temperature threshold, it controls the fan switch circuit 17 to turn on; in standby mode, the control unit 11 controls the fan switch circuit 17 to turn off. The control unit 11 continuously monitors the ambient temperature (or displays the temperature of the module 12), such as... Figure 6 As shown, P2 is an NTC thermistor (negative temperature coefficient thermistor). Its characteristics are: the higher the temperature, the lower the resistance; the lower the temperature, the higher the resistance. WD_AD is the analog signal output terminal, connected to the ADC (analog-to-digital converter) pin of the control unit. The control unit reads the voltage value of WD_AD, deduces the resistance value of P2, and then obtains the current temperature by looking up a table or calculation. When the temperature is normal (e.g., below 50°C), the fan switch circuit 17 remains off, and the fan 18 does not rotate to save power. When the temperature rises above a preset threshold (e.g., 50°C or 56°C), the control unit 11 outputs a high level to turn on the MOSFET, and the fan 18 starts working to accelerate heat dissipation.

[0042] The preset temperature threshold here can be calibrated based on the thermal stability parameters of the electronic paper material actually used and the maximum allowable operating temperature of the device. This embodiment does not impose strict limitations. Generally speaking, the recommended operating temperature for cholesteric electronic paper is -20°C to 60°C. Therefore, the preset temperature threshold can be set to 50°C, leaving a 10°C margin as a safety buffer.

[0043] In standby mode, the display module 12 and the front light module 15 are powered off. The main power consumption of the device at this time comes from the operation of the control unit 11 and sensor polling. If the ambient temperature is still higher than the threshold, theoretically, the fan 18 might need to continue cooling. However, considering that the display module 12 is powered off in standby mode and heat will not continue to accumulate (the heat source is cut off), and that the fan 18 itself also consumes power, in this embodiment, the control unit 11 forcibly shuts down the fan switch circuit 17 in standby mode to achieve optimal energy efficiency.

[0044] It should also be noted that the fan 18 control in this embodiment can adopt a graded speed regulation strategy, that is, different temperature ranges correspond to different fan 18 speeds. For example, when the temperature is between 50°C and 56°C, the fan 18 is driven by a PWM signal with a 30% duty cycle to run at a low speed; when the temperature is above 56°C, the fan 18 runs at full speed with a PWM signal with a 100% duty cycle. This graded speed regulation can effectively balance heat dissipation and energy consumption.

[0045] Through the aforementioned temperature-controlled fan 18 mechanism, this embodiment can actively dissipate heat for the display module 12 in high-temperature environments, preventing the electronic paper material from aging faster due to overheating, thereby extending the service life of outdoor devices. Simultaneously, by employing strategies such as shutting down the fan 18 in standby mode and implementing tiered speed control, ineffective energy consumption by the fan 18 in unnecessary scenarios is avoided.

[0046] Furthermore, it also includes: a door magnetic sensor 20; The door magnetic sensor 20 includes a wireless transmitter disposed inside the housing and a permanent magnet disposed on the maintenance door; The wireless transmitter is connected to the control unit 11 and is used to send a signal to the control unit 11 when the maintenance door is detected to be open.

[0047] In this embodiment, the door magnetic sensor 20 includes a wireless transmitter disposed inside the housing and a permanent magnet disposed on the maintenance door. The permanent magnet is installed inside the maintenance door and moves with the maintenance door. The wireless transmitter is installed inside the equipment housing, opposite to the permanent magnet. The wireless transmitter contains a reed switch (or Hall effect sensor) and a radio frequency transmission circuit.

[0048] When the maintenance door is closed, the permanent magnet approaches the wireless transmitter, and the two contacts inside the reed switch are attracted by the magnetic force and close (or the Hall sensor outputs a low level). The wireless transmitter is in standby mode or outputs a door-closed signal. When the maintenance door is opened, the permanent magnet moves away from the wireless transmitter, the magnetic force disappears, the reed switch contacts open (or the Hall sensor outputs a high level), generating a level transition. The wireless transmitter then sends a door-open signal to the control unit 11 via an radio frequency signal, such as... Figure 7As shown, P3 is a magnetic switch. When a magnet approaches, the internal spring contacts close, completing the circuit (equivalent to a closed switch). When the magnet moves away, the internal spring contacts open, breaking the circuit (equivalent to an open switch). DC_AD is a digital or analog signal output terminal. The control unit determines the door's position by detecting the DC_AD level; a low level indicates the door is closed, and a high level indicates the door is open.

[0049] In this embodiment, the wireless transmitter and control unit 11 can be connected via wired or wireless means. The advantage of using a wireless connection is that it reduces the cabling between the maintenance door and the housing, facilitating installation and maintenance.

[0050] When the control unit 11 receives the maintenance door opening signal sent by the door magnetic sensor 20, it will perform the following operations: report the status information (e.g., abnormal door opening, please check) to the host computer (remote monitoring platform or cloud server) through the communication interface; trigger an alarm, which can be a local audible and visual alarm (buzzer sound, LED flashing), or send an alarm SMS or software push to the administrator's mobile phone through the wireless communication module.

[0051] By using the door magnetic sensor 20, this embodiment can monitor the maintenance door status of the equipment in real time. Once an abnormal opening is detected, it will immediately report and trigger an alarm, thus serving as a theft prevention and timely maintenance reminder. This is particularly important for electronic paper information terminals deployed in remote outdoor areas (such as bus stop signs and scenic area guide signs).

[0052] Specifically, it also includes: storage batteries, solar charging modules, and voltage sampling circuits; The solar charging module is located on the outer surface of the electronic paper, and the battery is located in the internal cavity of the electronic paper; the solar charging module is used to collect solar energy to charge the battery. The voltage sampling circuit is connected to the battery and control unit 11, and is used to collect the voltage value of the battery and send it to the control unit 11.

[0053] The solar charging module is located on the outer surface of the e-paper, typically integrated into the top or front bezel area of ​​the device. The solar charging module consists of a solar panel (photovoltaic panel) and a charging controller. The solar panel converts sunlight into electrical energy, while the charging controller converts the unstable voltage output from the solar panel into a constant voltage / constant current output suitable for charging the battery.

[0054] The battery is housed within the internal cavity of the electronic paper to store electrical energy and power the entire system in the absence of light (night or rainy days). The battery can be a lead-acid battery, a lithium battery (such as a lithium iron phosphate battery), or other types of rechargeable batteries.

[0055] The voltage sampling circuit is connected to the battery and control unit 11 to collect the real-time voltage value of the battery and send it to the control unit 11. The voltage sampling circuit can be a voltage divider resistor network or a dedicated battery management chip. The control unit 11 reads the sampled voltage value through its built-in ADC and converts it into the remaining percentage of charge according to the battery's discharge curve (voltage-charge correspondence).

[0056] The control system monitors the battery voltage and takes energy-saving measures (such as reducing the brightness of the front light and extending the sensor detection cycle) when the voltage is too low. Simultaneously, it displays the current battery level icon on the display module 12, allowing maintenance personnel to understand the equipment's power supply status. The solar charging module continuously replenishes the battery, enabling the equipment to operate autonomously for extended periods in outdoor environments without mains power access, eliminating the need for frequent battery replacements or power cable installations.

[0057] By combining a solar charging module with a battery, this embodiment achieves energy self-sufficiency for outdoor equipment, greatly expanding the deployment flexibility of the equipment. Combined with a low-battery warning function via a voltage sampling circuit, damage caused by over-discharge of the battery can be avoided, improving system reliability and ease of maintenance.

[0058] This application also provides a cholesteric electronic paper control method for an outdoor camera, applied to a cholesteric electronic paper control system for an outdoor camera. The cholesteric electronic paper control system for an outdoor camera includes: a control unit 11, a display module 12, an ambient light sensor 13 for collecting light intensity values, a human proximity sensor 14 for collecting detection distance values, a front light module 15, and a power switch circuit 16. The front light module 15 includes a front light source and a front light driving circuit. The control unit 11 is connected to the control terminals of the ambient light sensor 13, the human proximity sensor 14, the display module 12, the front light driving circuit, and the power switch circuit 16, respectively. The power switch circuit 16 is connected to the display module 12 and the front light module 15 for connecting to a power source. like Figure 8 As shown, the method includes: S1: Receives the light intensity value sent by the ambient light sensor and the detection distance value sent by the human proximity sensor; S2: Adjust whether the front light module is turned on and the brightness of the front light module according to the light intensity value and the detection distance value; S3: Monitor the status of the display module's image processing task. After the display module completes the current image processing task, determine whether a new image processing instruction has been received. S4: If no new image refresh command is received, the power switch circuit is turned off, cutting off the power supply to the display module and the front light module before entering standby mode.

[0059] Step S1 involves data acquisition, receiving the light intensity value sent by the ambient light sensor 13 and the detection distance value sent by the human proximity sensor 14. This step refers to the control unit 11 reading the output data from the ambient light sensor 13 and the human proximity sensor 14 at a certain sampling period (e.g., once per second) via an I2C bus (Integrated Circuit Bus), SPI (Serial Peripheral Interface) bus, or GPIO (General Purpose Input / Output) interface. Since the sensors themselves may contain noise and transient fluctuations, the control unit 11 can also perform digital filtering (such as moving average filtering) on ​​the acquired data to improve data stability and accuracy.

[0060] Step S2 is intelligent front light control, which adjusts whether the front light module 15 is turned on and the brightness of the front light module 15 based on the light intensity value and the detection distance value. Unlike the traditional method of controlling the front light based on a single threshold of ambient light intensity, this embodiment integrates information from two dimensions: light intensity and distance to people, forming a refined hierarchical control strategy.

[0061] Step S3 monitors the image refresh task, tracking the refresh status of display module 12. Once display module 12 completes the current refresh task, it determines whether a new refresh command has been received. Because cholesteric electronic paper exhibits bistable characteristics, it can maintain display without continuous power supply after image refresh. Therefore, after the refresh task is completed, the system should cut off the power supply to display module 12 and front light module 15 to save energy. However, if power is cut off immediately after refresh, and a new refresh command arrives the next second (e.g., requiring the display of real-time updated information), the system needs to be powered on again, increasing energy consumption and potential delays due to frequent switching.

[0062] Based on this, this embodiment does not immediately cut off the power after the image brushing task is completed, but first determines whether there is a new image brushing instruction. This step can be achieved in the following ways: the control unit 11 maintains a task queue, and when the image brushing task is completed, it checks whether there are still image update requests to be processed in the queue; or, after the image brushing is completed, a short timer, such as 1 second, is started, and if no new image brushing instruction is received before the timer expires, it is considered that there is no new instruction.

[0063] Step S4 enters low-power standby mode. If no new image refresh command is received, the power switch circuit 16 is turned off, cutting off the power supply to the display module 12 and the front light module 15 before entering standby mode.

[0064] Once it is confirmed that there are no new image refresh commands, the control unit 11 outputs a low level (shutdown signal) to the power switch circuit 16 (MOSFET) through the IO (input / output) port. The MOSFET switches from the on state to the off state, physically cutting off the power supply circuit to the display module 12 and the front light module 15. At this time, the system enters deep standby mode. It should be noted that standby mode means that the control unit 11 itself may still continue to operate to maintain functions such as timed wake-up and sensor polling, but the display module 12 and the front light module 15 are in a completely power-off state.

[0065] Specifically, adjusting whether the front light module 15 is turned on and the brightness of the front light module 15 based on the light intensity value and the detection distance value includes: Determine whether the light intensity value is lower than the first threshold; If not, control the front light module 15 to turn off; If so, determine whether the duration of the light intensity value being lower than the first threshold exceeds the first duration; If the brightness exceeds the limit, control the front light module 15 to turn on in the first brightness mode; If it does not exceed the threshold, then determine whether the detection distance value is less than the second threshold. If it is less than the required brightness, then control the front light module 15 to turn on in the second brightness mode; If the brightness is not less than the minimum, the front light module 15 is turned on in the third brightness mode; wherein the brightness value of the third brightness mode is lower than that of the second brightness mode.

[0066] The control unit 11 compares the current ambient light intensity value collected by the ambient light sensor 13 with a preset first threshold (e.g., 300 lx). This first threshold is an empirically calibrated value. Under ambient light levels below 300 lx, the reflective display effect of the cholesteric electronic paper significantly decreases, reducing viewing comfort for the human eye. In this case, it is necessary to consider turning on the front light for supplemental illumination. If the determination is negative (i.e., the ambient light intensity is ≥300 lx), indicating sufficient ambient light and no need for supplemental illumination, the control unit 11 executes the front light module 15 shutdown command, and the front light is turned off.

[0067] If the judgment is yes (i.e., light intensity <300lx), it means the environment is too dark, and the next step of judgment is needed to determine how the front light should be turned on.

[0068] Determine whether the duration of low light exceeds the first time limit. Since the illuminance in the outdoor environment may fluctuate instantaneously, such as when dark clouds briefly block the sunlight, birds fly in front of the sensor, or leaves cast shadows, if the front light is turned on immediately every time the illuminance is below the threshold, it may cause the front light to switch on and off frequently in a short period of time, which will not only affect the user experience, but also increase unnecessary energy consumption.

[0069] To address this issue, this embodiment introduces a duration determination mechanism. The control unit 11 records the duration for which the light intensity value is continuously below a first threshold and compares this duration with a first duration (e.g., 6 hours).

[0070] If the illuminance remains below 300 lx for more than 6 hours, it means that the device has entered nighttime or continuous rainy weather. At this time, the front light should be available regardless of whether anyone is nearby, so as to ensure that the display screen can be clearly displayed when someone is watching.

[0071] If the duration exceeds the first duration, the control unit 11 executes the first brightness mode, turns on the front light, and dynamically adjusts the brightness according to the specific value of the current light intensity. For example, the lower the light intensity, the brighter the front light; and vice versa.

[0072] If the duration does not exceed the first time limit, it is determined whether the distance value detected by the human proximity sensor 14 is less than the second threshold. If the ambient light is below 300 lx but the duration is less than 6 hours, for example, at dusk or when clouds suddenly appear, it is necessary to determine whether a user is viewing the screen. The control unit 11 reads the distance value output by the human proximity sensor 14 (millimeter-wave radar or infrared sensor) and compares it with the second threshold (e.g., 2 meters). Generally, users of outdoor electronic paper information terminals (such as bus stop signs and billboards) usually stand within a range of 1 to 3 meters from the screen to view it; 2 meters is an empirical value, corresponding to a scenario where the user has approached and may be viewing the screen. Of course, this threshold can be adjusted according to the actual installation height of the device and the expected viewing distance; this embodiment does not impose strict limitations.

[0073] If the distance is less than the second threshold, the front light is activated in the second brightness mode. If the human proximity sensor 14 detects a target distance of less than 2 meters, meaning someone is approaching the screen, the control unit 11 executes the second brightness mode, activating the front light and dynamically adjusting the brightness according to the specific value of the current ambient light intensity. The effect of this step is that when the user approaches to view the screen, the screen can actively supplement the light to ensure clear display and provide a good user experience.

[0074] If the distance is not less than the second threshold, the front light is activated in the third brightness mode. If the human proximity sensor 14 detects a distance of ≥2 meters, meaning no one is approaching, or the person is far away but the ambient light is indeed weak, the control unit 11 executes the third brightness mode, activating the front light, but operating at an extremely low brightness, such as a fixed 2% of the maximum brightness. The screen maintains an extremely low brightness to avoid the discomfort caused by a completely black screen, while also saving power to the greatest extent possible.

[0075] In summary, this embodiment achieves refined and scene-adaptive control of the front light module 15, striking a balance between ensuring user experience and reducing energy consumption.

[0076] Specifically, the first brightness mode and the second brightness mode are: dynamic adjustment mode; The third brightness mode is a fixed brightness mode; The method also includes: In the third brightness mode, if the target is detected to be leaving the detection range based on the detection distance value, the front light module 15 is turned off.

[0077] In practical applications, although the triggering conditions for the first and second brightness modes are different, their brightness adjustment algorithms are the same: both dynamically adjust the brightness based on the specific value of the current ambient light intensity. This dynamic adjustment can be achieved through proportional-integral-derivative (PID) control, lookup table method, or linear mapping. For example, the control unit 11 can store a pre-stored mapping table of light intensity and ambient light intensity, and through dynamic adjustment, it can ensure that the user's viewing comfort level remains relatively constant.

[0078] However, the first brightness mode and the second brightness mode have fundamental differences in application scenarios: The first brightness mode corresponds to long-term low-light scenarios (illuminance <300lx and lasting >6 hours). The system judges that it has entered night or continuous rainy weather, so even if no one is near, the front light is kept in dynamic adjustment mode (in standby state) to ensure that the best display effect can be presented immediately once someone approaches; The second brightness mode corresponds to short-term low-light scenarios with someone approaching (illuminance <300lx and duration not meeting the standard and distance <2 meters). At this time, the user is watching, so the front light is immediately turned on in dynamic adjustment mode.

[0079] In the third brightness mode, if a target is detected leaving the detection range based on the detection distance value, the front light module 15 is turned off. It should be noted that the third brightness mode is for low-light scenarios where no one is nearby. In this mode, the front light maintains a low brightness of 2%. This avoids the screen going completely black in low-light environments (making the device appear broken or out of power), while maintaining its presence with extremely low power consumption.

[0080] If the human proximity sensor 14 further detects that the target that was originally within the detection range has completely moved away (for example, the user walks away from a distance of 2 meters until they are beyond the effective detection range of the sensor), it means that there is no human activity in front of the device, and it is unnecessary to continue maintaining the 2% brightness of the front light. Therefore, this method further turns off the front light module 15, thereby putting the system into a lower power consumption state (the front light is completely powered off). When the human proximity sensor 14 detects someone approaching again, it returns from the off state to the third brightness mode or the second brightness mode.

[0081] Specifically, the status of the image-clearing task of the display module 12 is monitored. After the display module 12 completes the current image-clearing task, it determines whether a new image-clearing command has been received, including: The monitoring displays the progress of the map-clearing task for module 12; When the map-clearing task is detected as complete, start the delay counter; If no new refresh command is received during the delay counter's counting period, it is determined that no new refresh command has been received and proceeds to the next step.

[0082] The control unit 11 can determine whether a brushing task is currently being executed by reading the status pin of the display module 12 or by using the software task status flag.

[0083] When the image processing task is detected as complete, a delay counter is started. After confirming the completion of the image processing task, the control unit 11 does not immediately perform a power-off operation, but instead starts an internal delay counter. The preset duration of this delay counter (e.g., 1 second, 3 seconds, or 5 seconds) can be configured according to the application scenario.

[0084] If no new refresh command is received during the delay counter's counting period, it is determined that no new refresh command has been received. If the control unit 11 does not receive a new refresh command from the host computer or the task queue during the delay counter's counting period, it is assumed that there is no new display update requirement, and then the subsequent power-off operation is performed (step S4).

[0085] If a new map-clearing command is received during the timeout period, the delay counter is reset, and the execution flow of the new map-clearing task is entered. After completion, the delay judgment is restarted.

[0086] By introducing a delay counter, this embodiment effectively avoids frequent power-on and power-off cycles in scenarios involving continuous image scrolling within a short period, reducing switching losses and improving system response speed. For example, when the device needs to continuously scroll and display multiple bus arrival information, the time interval between each piece of information may be very short (e.g., 0.5 seconds). If the power is cut off immediately after each image scroll, it needs to be powered on again before the next scroll, which increases unnecessary operation delays and power consumption. With the delay-based judgment, the power is only truly cut off when there is indeed no new display demand within a certain period of time.

[0087] Specifically, the outdoor unit's cholesteric electronic paper control system also includes: a door magnetic sensor 20; the method also includes: The maintenance door opening signal was received from the door magnetic sensor 20; An alarm signal is generated and sent to the remote monitoring platform via a wireless communication module.

[0088] The control unit 11 monitors the output status of the door magnetic sensor 20 in real time via GPIO interrupt or polling. When the maintenance door is opened, the state of the reed switch or Hall sensor in the door magnetic sensor 20 changes, and the wireless transmitter (or direct wired connection) sends the change signal to the control unit 11.

[0089] An alarm signal is generated and sent to the remote monitoring platform via a wireless communication module. Upon receiving the door opening signal, the control unit 11 immediately generates an alarm message (including device serial number, timestamp, door opening status, etc.) and sends the message to the preset remote monitoring platform (cloud server or monitoring center) via the wireless communication module. If it is an unattended outdoor device, a local audible and visual alarm can also be triggered simultaneously for deterrence.

[0090] By linking with a remote monitoring platform, maintenance personnel can be notified in real time of any abnormal opening of equipment cabinet doors, and respond promptly to potential theft or vandalism, thereby improving the security of outdoor equipment.

[0091] Specifically, the outdoor unit's cholesteric electronic paper control system also includes: a battery and a voltage sampling circuit; the voltage sampling circuit is connected to the battery and the control unit 11; the method also includes: The voltage value of the battery is collected by the voltage sampling circuit and output to the display module 12 for visualization. Determine if the current voltage value is lower than the preset power threshold; If so, reduce the brightness of the front light module 15.

[0092] The control unit 11 periodically reads the voltage signal output by the voltage sampling circuit through its built-in analog-to-digital converter (ADC), and converts the real-time voltage value into the remaining power percentage (0%~100%) according to the battery's discharge characteristic curve (voltage-power conversion table). This power percentage can be output to the display module 12 in a graphical or digital manner for maintenance personnel or users to view.

[0093] The control unit 11 determines whether the current voltage value is lower than a preset power threshold. The control unit 11 compares the collected battery voltage value with the preset power threshold (e.g., the voltage value corresponding to 20% of the remaining power).

[0094] If the voltage is below a threshold, the brightness of the front beam module 15 is reduced. When the battery power is detected to be too low, the system should prioritize ensuring core functions. Therefore, the control unit 11 can actively reduce the brightness level of the front beam module 15, for example, by multiplying the current target brightness value by a discount factor, or by limiting the maximum allowable brightness to a lower level.

[0095] It should be noted that the reduction in front light brightness is done while ensuring basic readability for the user. However, if the ambient light is extremely low and no one is around (third brightness mode), the brightness is already very low (e.g., 2%), and it will not be reduced further.

[0096] By employing a low-battery brightness reduction strategy, this embodiment can proactively extend the system's battery life when the battery is low, preventing display interruptions due to battery depletion and improving system reliability.

[0097] The above provides a detailed description of the outdoor cholesteric electronic paper control system and control method provided in this application. The various embodiments in the 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. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

[0098] It should also 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.

Claims

1. An outdoor cholesteric electronic paper control system, characterized in that, include: Control unit, display module, ambient light sensor for collecting light intensity values, human proximity sensor for collecting detection distance values, front light module, power switch circuit; The front light module includes a front light source and a front light driving circuit; The control unit is connected to the ambient light sensor, the human proximity sensor, the display module, the control terminal of the front light driving circuit, and the control terminal of the power switch circuit, respectively; the power switch circuit is connected to the display module and the front light module for connecting to a power source. The control unit controls the activation and brightness adjustment of the front light module based on the light intensity value sent by the ambient light sensor and the detection distance value sent by the human proximity sensor; and when the image brushing task of the display module is completed and no new image brushing command is input, the control unit controls the power switch circuit to disconnect, cuts off the power supply to the display module and the front light module, and enters standby mode.

2. The outdoor cholesteric electronic paper control system according to claim 1, characterized in that, Also includes: Temperature sensor, fan switch circuit, fan; The temperature sensor is mounted on the back circuit board of the display module. The fan is located on the side wall or back heat dissipation grille of the electronic paper; The temperature sensor is connected to the control unit, the control terminal of the fan switch circuit is connected to the control unit, the input terminal of the fan switch circuit is connected to the power supply, and the output terminal of the fan switch circuit is connected to the fan. The control unit receives the temperature value sent by the temperature sensor, and controls the fan switch circuit to turn on when the temperature value is higher than the preset temperature threshold. In standby mode, the control unit controls the fan switch circuit to turn off.

3. The outdoor cholesteric electronic paper control system according to claim 1, characterized in that, Also includes: Door magnetic sensor; The door magnetic sensor includes a wireless transmitter disposed inside the housing and a permanent magnet disposed on the maintenance door; The wireless transmitter is connected to the control unit and is used to send a signal to the control unit when the maintenance door is detected to be open.

4. The outdoor cholesteric electronic paper control system according to claim 1, characterized in that, Also includes: Storage battery, solar charging module, voltage sampling circuit; The solar charging module is disposed on the outer surface of the electronic paper, and the battery is disposed in the internal cavity of the electronic paper; The solar charging module is used to collect solar energy to charge the battery; The voltage sampling circuit is connected to the battery and the control unit, and is used to collect the voltage value of the battery and send it to the control unit.

5. A method for controlling cholesteric electronic paper in an outdoor camera, characterized in that, An outdoor cholesteric electronic paper control system is provided, comprising: a control unit, a display module, an ambient light sensor for acquiring light intensity values, a human proximity sensor for acquiring detection distance values, a front light module, and a power switch circuit; the front light module includes a front light source and a front light driving circuit; the control unit is connected to the control terminals of the ambient light sensor, the human proximity sensor, the display module, the front light driving circuit, and the power switch circuit; the power switch circuit is connected to the display module and the front light module for power supply. The method includes: Receives the light intensity value sent by the ambient light sensor and the detection distance value sent by the human proximity sensor; Adjust the front light module's activation and brightness based on the light intensity value and the detection distance value; Monitor the image-brushing task status of the display module, and determine whether a new image-brushing instruction has been received after the display module completes the current image-brushing task; If no new image refresh command is received, the power switch circuit is turned off, cutting off the power supply to the display module and the front light module before entering standby mode.

6. The outdoor cholesteric electronic paper control method according to claim 5, characterized in that, The step of adjusting whether the front light module is turned on and the brightness of the front light module according to the light intensity value and the detection distance value includes: Determine whether the light intensity value is lower than a first threshold; If not, control the front light module to turn off; If so, determine whether the duration of the light intensity value being lower than the first threshold exceeds the first duration; If the brightness exceeds the limit, control the front light module to turn on in the first brightness mode; If it does not exceed the threshold, then determine whether the detection distance value is less than the second threshold. If the brightness is less than the specified value, the front light module is controlled to turn on in the second brightness mode. If the brightness is not less than the second brightness mode, the front light module is controlled to turn on in the third brightness mode; wherein the brightness value of the third brightness mode is lower than that of the second brightness mode.

7. The outdoor cholesteric electronic paper control method according to claim 6, characterized in that, The first brightness mode and the second brightness mode are both dynamic adjustment modes. The third brightness mode is a fixed brightness mode; The method further includes: In the third brightness mode, if the target is detected to have left the detection range based on the detection distance value, the front light module is controlled to turn off.

8. The outdoor cholesteric electronic paper control method according to claim 5, characterized in that, Monitor the image-brushing task status of the display module. After the display module completes the current image-brushing task, determine whether a new image-brushing command has been received, including: Monitor the progress of the image-brushing task of the display module; When the map-clearing task is detected as complete, start the delay counter; If no new refresh command is received during the counting period of the delay counter, it is determined that no new refresh command has been received and proceeds to the next step.

9. The outdoor cholesteric electronic paper control method according to claim 5, characterized in that, The outdoor unit's cholesteric electronic paper control system further includes: a door magnetic sensor; the method further includes: The maintenance door opening signal sent by the door magnetic sensor was received; An alarm signal is generated and sent to the remote monitoring platform via a wireless communication module.

10. The outdoor camera cholesteric electronic paper control method according to claim 5, characterized in that, The outdoor-type cholesteric electronic paper control system further includes: a battery and a voltage sampling circuit; the voltage sampling circuit is connected to the battery and the control unit; the method further includes: The voltage value of the battery is acquired by the voltage sampling circuit and output to the display module for visual display. Determine whether the current voltage value is lower than a preset power threshold; If so, reduce the brightness of the front light module.

Images