A virtual liquid crystal display system and method for an electric energy meter without a physical display

Abstract

The present application relates to the technical fields of smart electric energy meter and power internet of things, and discloses a virtual liquid crystal display system and method of electric energy meter without physical display unit, wherein the electric energy meter terminal comprises a master control module, a metering module, a near field communication module and a security authentication module; the electric energy meter terminal is printed with an identity identification; the virtual display mobile terminal comprises a code scanning and pairing module, an identity authentication module, a data interaction module and a virtual liquid crystal rendering module; the code scanning and pairing module is used for identifying the identity identification and initiating a pairing connection request to the near field communication module; the identity authentication module and the security authentication module establish a near field communication link after completing two-way security authentication; the data interaction module obtains electric energy metering data collected by the metering module, and generates a virtual liquid crystal interface by the virtual liquid crystal rendering module. The physical liquid crystal display unit of the traditional electric energy meter is abandoned, and the traditional physical liquid crystal full display function is realized by 1:1 replacement through low-power near field communication technology combined with mobile terminal virtual liquid crystal rendering.

Description

Technical Field

[0001] This invention relates to the fields of smart energy meters and the Internet of Things for power, and particularly to a virtual liquid crystal display system and method for energy meters without a physical display unit. Background Technology

[0002] Currently, smart meters in China have achieved full coverage of residential and industrial / commercial scenarios. Existing smart meters are all equipped with physical liquid crystal displays (LCDs) to display core information such as real-time power consumption, remaining electricity cost, electrical parameters, operating status, and alarm information. This is the core basic component for human-machine interaction in smart meters.

[0003] However, in the long-term large-scale application and operation and maintenance process, existing energy meters with physical LCDs have the following unavoidable technical defects: First, the hardware cost remains high. The LCD display module includes an LCD screen, backlight driving circuit, interface circuit, protection structure, etc., and the cost of a single module accounts for 10%-15% of the total hardware cost of the smart energy meter. The scale of newly added or replaced smart energy meters in China exceeds 100 million units every year, and the annual cost investment in LCD modules alone exceeds several billion yuan, severely limiting the room for cost reduction. Second, the failure rate is high, which restricts the lifespan of the whole machine. The LCD screen is a component with a high incidence of failure in energy meters. In the low-temperature environment of the north, problems such as liquid crystal solidification, blurry display, and screen distortion are prone to occur. In the humid environment of the south, problems such as water ingress, pin oxidation, and backlight damage are prone to occur. At the same time, the rated lifespan of the LCD backlight LED is about 5-8 years, which is less than the design lifespan of 10 years for energy meters, becoming a core shortcoming restricting the lifespan of the whole machine. Third, the operation and maintenance costs are high, and resources are wasted. LCD display failures are explicit and mandatory faults in power operation and maintenance standards, requiring on-site repair or replacement of the entire meter. The labor and material costs of a single maintenance operation far exceed the value of the LCD module itself. Many electricity meters with only LCD damage are scrapped as a whole, resulting in serious resource waste and failing to meet green and low-carbon requirements. Fourth, the information display capability is severely limited. Due to the size and cost limitations of electricity meters, the physical LCD screen is small and has low resolution, only able to display limited fixed parameters in rotation. It cannot display in-depth information such as historical electricity consumption curves, time-of-use details, alarm details, and fault guidance, failing to meet the needs of residential users for electricity consumption analysis and on-site debugging by operation and maintenance personnel. Fifth, there is a risk of electricity privacy leakage. The content of the physical LCD screen can be viewed by any person on site. Residents' electricity consumption status, remaining electricity fees, and other private information are at risk of being obtained by unauthorized personnel, with no access control capabilities. Sixth, the environmental adaptability is poor. In harsh environments such as outdoors and in operating conditions, the protection level of the LCD screen is insufficient, easily leading to irreversible damage and making it unsuitable for special application scenarios.

[0004] In existing technologies, some smart meters have added Bluetooth modules to achieve auxiliary meter reading and parameter configuration functions. However, they all retain the physical LCD screen as the basic display unit, with Bluetooth only serving as an auxiliary communication means. This does not solve the series of core problems caused by the physical LCD screen. In addition, some remote display solutions push the meter data to the backend system through the power wireless private network and then forward it to the user's APP. This solution relies heavily on public network / private network communication and cannot meet the on-site viewing needs in scenarios without public network coverage. At the same time, the data transmission delay is large and the real-time performance is poor, so it cannot replace the real-time display function of the physical LCD screen on site.

[0005] Therefore, there is a need for a virtual display system and method for electricity meters without physical display units, in order to replace the real-time display of physical LCDs and meet the requirements of human-computer interaction and operation and maintenance specifications. Summary of the Invention

[0006] The purpose of this invention is to break through the long-standing technical bias in the industry and provide a virtual LCD display system and method for electricity meters without physical display units. It completely abandons the physical LCD display units of traditional electricity meters and achieves a 1:1 replacement of the full display function of traditional physical LCDs by combining low-power near-field communication technology with mobile virtual LCD rendering. At the same time, it expands the display dimensions and interactive capabilities, fundamentally solving the technical problems of high cost, high failure rate, difficult operation and maintenance, limited information display, and privacy leakage caused by physical LCDs in the existing technology.

[0007] To achieve the above-mentioned objectives, the embodiments of the present invention provide the following technical solutions:

[0008] A virtual LCD display system for an energy meter without a physical display unit includes an energy meter terminal, a virtual display mobile terminal, and a near-field communication link;

[0009] The electricity meter terminal includes a main control module, as well as a metering module, a near-field communication module, and a security authentication module, which are respectively connected to the main control module; the outer shell of the electricity meter terminal is printed with an identification mark;

[0010] The virtual display mobile terminal includes a QR code pairing module, an identity authentication module, a data interaction module, and a virtual LCD rendering module. The QR code pairing module is used to initiate a pairing connection request to the near-field communication module after recognizing the identity identification mark. The identity authentication module and the security authentication module establish a near-field communication link after completing two-way security authentication. The data interaction module obtains the electricity metering data collected by the metering module, and the virtual LCD rendering module generates a virtual LCD interface.

[0011] Furthermore, the electricity metering data collected by the metering module includes voltage, current, active power, reactive power, forward active energy, reverse active energy, real-time energy, and time-of-use energy.

[0012] Furthermore, the near-field communication module is awakened after receiving a pairing connection request to establish a near-field communication link and then complete the data interaction between the virtual display mobile terminal and the main control module; when there is no data transmission time for more than 30 seconds, it automatically switches to low-power broadcast state.

[0013] Furthermore, the security authentication module has a built-in SM4 encryption chip that stores the electricity meter terminal's serial number, unique communication address, SM4 public and private key pair, and device identity certificate.

[0014] Furthermore, the system also includes a storage module for storing the electricity metering data collected by the metering module.

[0015] A method for displaying a virtual liquid crystal on an energy meter without a physical display unit includes the following steps:

[0016] Step 1: After the electricity meter terminal is powered on, the near-field communication module enters a low-power broadcast state; the metering module collects electricity metering data according to a preset frequency.

[0017] Step 2: The virtual display mobile terminal scans the identification mark of the electricity meter terminal and initiates a pairing connection request to the near-field communication module of the electricity meter terminal;

[0018] Step 3: After receiving the pairing connection request, the electricity meter terminal completes two-way security authentication with the virtual display mobile terminal and establishes a near-field communication link.

[0019] Step 4: The main control module generates data to be displayed from the electricity metering data, encrypts the data to be displayed to generate encrypted data, and then pushes it to the data interaction module of the virtual display mobile terminal.

[0020] Step 5: The data interaction module decrypts and verifies the encrypted data and then transmits it to the virtual LCD rendering module of the virtual display mobile terminal. The virtual LCD rendering module matches the corresponding display mode and operable functions according to the permission level of the resident user or maintenance personnel, and displays the virtual LCD interface on the virtual display mobile terminal.

[0021] Furthermore, in step 1, after the electricity meter terminal is powered on, the main control module first completes the initialization operations of the metering module, near-field communication module, and security authentication module.

[0022] Furthermore, step 2 specifically involves the virtual display mobile terminal calling the QR code pairing module. The QR code pairing module scans and parses the identification identifier of the electricity meter terminal to extract the unique communication address and pairing key index of the electricity meter terminal, and initiates a near-field communication pairing connection request to the near-field communication module of the electricity meter terminal at the specified address based on the unique communication address.

[0023] Furthermore, step 3 specifically includes:

[0024] Step 3-1: The identity authentication module of the virtual display mobile terminal initiates a pairing connection request to the security authentication module of the electricity meter terminal and generates a first random number;

[0025] Step 3-2: The security authentication module performs permission verification, generates challenge parameters, and returns them to the identity authentication module; the challenge parameters include the first signature result, the device identity certificate of the electricity meter terminal, and the second random number;

[0026] Step 3-3: The identity authentication module receives the challenge parameters, uses the pre-stored certificate to verify the device identity certificate of the electricity meter terminal, generates a second signature result, and returns it to the security authentication module.

[0027] In steps 3-4, the security authentication module receives the second signature result, verifies the signature, and establishes a near-field communication link between the electricity meter terminal and the virtual display mobile terminal.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) Significantly reduce the total life cycle cost: Completely eliminate the physical LCD display module and its supporting drive and protection circuits, the hardware cost of a single meter can be reduced by 10%-15%; at the same time, the LCD components with high failure rates are eliminated, the mean time between failures (MTBF) of the whole machine is increased by more than 20%, the annual maintenance cost is reduced by more than 30%, and the economic benefits of the whole life cycle are significant.

[0030] (2) Breaking the long-standing technical prejudice in the industry and achieving disruptive innovation: This invention breaks through the inherent technical prejudice that "electricity meters must be equipped with physical liquid crystals". For the first time, it proposes a technical solution to completely replace physical liquid crystals with near-field communication virtual liquid crystals. Under the premise of meeting all the requirements of industry standards for on-site display functions, it fundamentally solves all the inherent defects brought about by physical liquid crystals.

[0031] (3) Expand the dimensions of information display and enhance the human-computer interaction experience: Through the virtual LCD interface of the virtual display mobile terminal, it can not only restore the display content and logic of the traditional physical LCD in 1:1 and achieve seamless connection of the usage habits of operation and maintenance personnel; it can also expand the display of historical power consumption curves, time-sharing details, alarm details, fault guidance, power consumption analysis and other in-depth content, support touch interaction and data export, and completely solve the problems of limited information display and inconvenient interaction of traditional physical screens.

[0032] (4) Fundamentally solve the problem of electricity privacy leakage: Only residential users and maintenance personnel who have passed two-way identity authentication can scan the code to connect and view the electricity meter data. Unauthorized personnel cannot obtain any electricity information, realizing full control over access permissions for electricity data and completely solving the privacy leakage risk brought about by physical screens.

[0033] (5) Strong environmental adaptability and wider range of applicable scenarios: After the LCD display component is removed, the protection level of the whole energy meter can be greatly improved, and it can be adapted to harsh environments such as low temperature, humidity, high dust, and strong vibration, thus expanding the application boundaries of energy meters in outdoor, mining and special industrial scenarios.

[0034] (6) Low power consumption design, fully compliant with metering specifications: It adopts Bluetooth BLE / StarFlash SLE low power near field communication technology, and is in microampere-level low power broadcast state by default. It is only woken up when connected, and the power consumption of the whole machine does not increase significantly, which fully complies with the power consumption and metering accuracy specifications of the electricity meter; at the same time, it is equipped with an emergency power supply module for power outages, so that on-site data can still be viewed after the mains power is cut off, and its availability is better than the traditional physical LCD solution. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the system provided by the present invention.

[0037] Figure 2 The method flowchart provided by the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance, or suggesting any such actual relationship or order between these entities or operations. Additionally, the terms "connected," "linked," etc., can refer to a direct connection between elements, components, modules, etc., or an indirect connection via other elements, components, modules, etc.

[0040] Example 1:

[0041] This invention is achieved through the following technical solutions, such as... Figure 1 As shown, the present invention provides a virtual liquid crystal display system for an energy meter without a physical display unit. The system includes an energy meter terminal, a virtual display mobile terminal, and a near-field communication link.

[0042] The aforementioned electricity meter terminal is primarily used to collect electricity metering data. Since the widespread application of smart meters, a common bias has emerged among those skilled in the art: the physical LCD screen is an indispensable core component of smart meters, the only carrier for achieving on-site human-machine interaction and meeting operation and maintenance specifications. Therefore, all smart meter designs in the industry retain the physical LCD screen. However, the electricity meter terminal in this solution does not have a physical LCD screen or its supporting display driver circuit. Therefore, this solution eliminates the physical LCD screen and achieves full display of electricity metering data on a virtual display mobile terminal via a near-field communication link, thus solving the problem of technological bias restricting the iterative upgrade of smart meters.

[0043] The electricity meter terminal described in this solution includes a metering module, a main control module, a near-field communication module, a security authentication module, a storage module, and a power supply module. A unique identification identifier, such as a QR code, is printed on the outer casing of the electricity meter terminal. This identifier contains the electricity meter terminal's serial number, unique communication address, pairing key index, and a link to a virtual LCD mini-program. Residential users and maintenance personnel can scan the identification identifier to directly access the corresponding virtual LCD mini-program, achieving one-click connection with the electricity meter terminal and significantly improving ease of use.

[0044] The metering module is used to collect real-time electricity metering data from residential users and transmit this data to the main control module. The metering module uses an electricity metering chip that conforms to smart meter technical specifications. The collected electricity metering data includes voltage, current, active power, reactive power, forward active energy, reverse active energy, real-time energy, and time-of-use energy.

[0045] The main control module receives electricity metering data collected by the metering module, processes the data, generates data to be displayed, and stores it in the storage module. Simultaneously, it controls the operating status of the near-field communication module, handling two-way authentication and data encryption / decryption transmission. The main control module uses a 32-bit low-power control unit (MCU) as the core control unit of the electricity meter terminal.

[0046] The near-field communication module is activated upon receiving a pairing request from the virtual display mobile terminal to establish a near-field communication link and then complete data interaction between the virtual display mobile terminal and the main control module. If there is no data transmission for more than 30 seconds, it automatically switches to low-power broadcast mode, and is activated again upon receiving a pairing request. The near-field communication module can use a Bluetooth 5.3 BLE module, supporting low-power broadcast mode. By default, it is in low-power broadcast mode with a 100ms interval, and the overall standby power consumption is less than 50μA, meeting the power consumption specifications for electricity meter terminals.

[0047] The security authentication module performs two-way security authentication on pairing connection requests from virtual display mobile terminals. It employs the SM4 algorithm for symmetric encryption of the data to be displayed and implements tiered access control for residential users and maintenance personnel. The security authentication module incorporates a national standard SM4 encryption chip, storing the electricity meter terminal's serial number, unique communication address, SM4 public / private key pair, and device identity certificate. The SM4 public / private key pair includes an SM4 public key and an SM4 private key.

[0048] The storage module stores historical metering data, including data to be displayed, operating parameters, event logs, alarm records, and display specification configuration files. The storage module uses a high-capacity Flash storage chip, which can meet the storage requirements for at least 12 months of historical metering data.

[0049] The power supply module provides a stable power supply for the metering module, main control module, safety authentication module, storage module, and near-field communication module.

[0050] Furthermore, the electricity meter terminal also includes a power outage emergency power supply module. This module provides emergency power to the metering module, main control module, security authentication module, storage module, and near-field communication module in the event of a mains power outage. The power outage emergency power supply module uses a high-capacity lithium-ion battery to ensure normal pairing and data viewing during power outages, meeting on-site maintenance needs.

[0051] Furthermore, the electricity meter terminal also includes a physical button. The physical button is an optional module feature, installed on the electricity meter terminal casing and electrically connected to the main control module. It is used to trigger the near-field communication module's broadcast wake-up. Broadcast wake-up means that the near-field communication module, in a silent state, only opens a 5-minute broadcast window to respond to pairing connection requests when a residential user or maintenance personnel presses the physical button. The physical button further enhances device security, preventing malicious connections and attacks.

[0052] The virtual display mobile terminal mentioned in this solution refers to a smart terminal capable of running virtual LCD mini-programs, serving as the sole human-machine interface for electricity meter terminals without a physical display screen. This includes, but is not limited to, mobile phones and tablets. The virtual display mobile terminal includes a QR code pairing module, an identity authentication module, a virtual LCD rendering module, and a data interaction module.

[0053] The QR code pairing module allows residential users or maintenance personnel to scan the identification mark printed on the outer shell of the electricity meter terminal. This mark is used to parse the information of the electricity meter terminal, complete the automatic configuration of Bluetooth or StarFlash pairing parameters, and first initiate a pairing connection request to the near-field communication module of the electricity meter terminal. This eliminates the need for residential users or maintenance personnel to manually search for the electricity meter terminal and enter a pairing password, achieving "scan and connect".

[0054] The identity authentication module sends the identity information of the residential user or maintenance personnel to the security authentication module of the electricity meter terminal to complete two-way security authentication. After two-way security authentication, the near-field communication module establishes a near-field communication link between the electricity meter terminal and the virtual display mobile terminal. Two-way identity authentication includes residential user identity authentication and maintenance personnel identity authentication. Specifically, after successful authentication, the residential user can only view the electricity metering data corresponding to the electricity meter terminal under their own name; after successful authentication, the maintenance personnel can obtain full operation permissions for the electricity meter terminals within their corresponding maintenance scope.

[0055] The data interaction module is used to send data query commands and parameter configuration commands to the electricity meter terminal via the near-field communication link. At the same time, it receives encrypted data sent by the electricity meter terminal, and after decryption and verification, transmits it to the virtual LCD rendering module.

[0056] The virtual LCD rendering module receives and renders the data to be displayed sent by the electricity meter terminal, and generates a virtual LCD display interface corresponding to the electricity meter terminal, realizing the replacement and expansion of the traditional physical LCD display function of the electricity meter. The display modes of the virtual LCD rendering module include virtual display mode and extended display mode. Specifically, the virtual display mode strictly follows the smart electricity meter display specifications, restoring the display interface, carousel logic, and display content of the traditional physical LCD display of the electricity meter at a 1:1 ratio. This includes core parameters such as real-time electricity consumption, remaining balance, voltage, current, and power factor, ensuring seamless integration with the usage habits of operation and maintenance personnel. The extended display mode can display extended content such as historical electricity consumption curves, time-of-use electricity consumption details, alarm details, fault diagnosis index, and electricity analysis reports according to the needs of residential users. It also supports functions such as data screenshot, data export, and data sharing.

[0057] The near-field communication link is a point-to-point near-field communication link established by the near-field communication module based on the Bluetooth BLE protocol or the StarFlash protocol, used to realize data interaction between the power terminal and the virtual display mobile terminal. The communication distance of the near-field communication link is 0-10 meters, and data interaction can still be realized in scenarios without network coverage. Moreover, the data transmission latency is less than 100ms, enabling real-time data refresh.

[0058] Based on the above system, this solution also provides a method for displaying electricity meters without a physical display, such as... Figure 2 As shown, the method includes:

[0059] Step 1: After the electricity meter terminal is powered on, the near-field communication module enters a low-power broadcast state; the metering module collects electricity metering data according to a preset frequency.

[0060] After the electricity meter terminal is powered on, the main control module first completes the initialization operations of each module. Specifically, after power-on, the low-power microcontroller chip (MCU) of the main control module is initialized; the main control module initializes the electricity metering chip of the metering module, including setting calibration parameters into the electricity metering chip, wherein the calibration parameters are pre-set parameters used to adjust the measurement accuracy of the electricity metering chip; the main control module initializes the universal asynchronous transceiver (UART) of the near-field communication module, including setting the AT commands of the universal asynchronous transceiver (UART); the main control module initializes the ESAM chip of the security authentication module, including performing a cold reset on the ESAM chip and obtaining the serial number of the ESAM chip; the main control module initializes the storage chip of the storage module, including reading the stored data and verifying its correctness.

[0061] The electricity metering data is used to collect electricity metering data from residential users, including voltage, current, active power, reactive power, forward active energy, reverse active energy, real-time energy, and time-of-use energy. The preset frequency can be set based on experience. The main control module verifies the collected electricity metering data and then stores it in the storage module. The verification includes verification of the interaction between the low-power microcontroller chip (MCU) and the electricity metering chip, as well as outlier verification.

[0062] In some embodiments, when the electricity meter terminal is equipped with a physical button, the near-field communication module is in a silent state by default, and when the physical button is triggered, the near-field communication module enters a low-power broadcast state.

[0063] Step 2: The virtual display mobile terminal scans the identification mark of the electricity meter terminal and initiates a pairing connection request to the near-field communication module of the electricity meter terminal.

[0064] The virtual display mobile terminal calls the QR code pairing module. The QR code pairing module scans and parses the identification mark of the electricity meter terminal to extract the unique communication address and pairing key index of the electricity meter terminal. Based on the unique communication address, it initiates a near-field communication pairing connection request to the near-field communication module of the electricity meter terminal at the specified address.

[0065] Step 3: After receiving the pairing connection request, the electricity meter terminal completes two-way security authentication with the virtual display mobile terminal and establishes a near-field communication link.

[0066] Step 3 specifically includes:

[0067] Step 3-1: The identity authentication module of the virtual display mobile terminal initiates a pairing connection request to the security authentication module of the electricity meter terminal and generates a first random number.

[0068] Specifically, the virtual display mobile terminal sends the identity information of the residential user or maintenance personnel, the device identifier of the virtual display mobile terminal, and a generated first random number to the security authentication module of the electricity meter terminal through a pairing connection request. The first random number is a one-time challenge code generated when the virtual display mobile terminal initiates the pairing connection request, used to verify the legitimacy of the electricity meter terminal.

[0069] Step 3-2: The security authentication module performs permission verification, generates challenge parameters, and returns them to the identity authentication module; the challenge parameters include the first signature result, the device identity certificate of the electricity meter terminal, and the second random number.

[0070] Specifically, after receiving a pairing connection request, the security authentication module first verifies the identity information of the resident user or maintenance personnel using the national standard SM4 encryption chip. If the verification passes, a challenge parameter is generated; if the verification fails, the security authentication module directly rejects the current pairing connection request and does not proceed with further operations. The challenge parameter includes a first signature result, the device identity certificate of the electricity meter terminal, and a second random number. Specifically, the security authentication module uses its own SM4 private key to sign the first random number to obtain a first signature result, and simultaneously generates a second random number.

[0071] Step 3-3: The identity authentication module receives the challenge parameters, uses the pre-stored certificate to verify the device identity certificate of the electricity meter terminal, generates a second signature result, and returns it to the security authentication module.

[0072] The identity authentication module first uses the pre-stored certificate to verify the device identity certificate of the electricity meter terminal. After the verification is successful, it uses the SM4 public key in the certificate to perform a second verification on the first signature result to update the first signature result. After the verification is successful, it uses the second random number from the security authentication module to sign and obtain the second signature result. Finally, the second signature result is sent to the security authentication module.

[0073] In steps 3-4, the security authentication module receives the second signature result, verifies the signature, and establishes a near-field communication link between the electricity meter terminal and the virtual display mobile terminal.

[0074] Specifically, after receiving the second signature result, the security authentication module verifies the signature. Once the verification is successful, two-way security authentication is completed. Finally, the virtual display mobile terminal and the electricity meter terminal negotiate the SM4 session key to establish a point-to-point encrypted near-field communication link.

[0075] Step 4: The main control module generates display data from the electricity metering data, encrypts the display data to generate encrypted data, and then pushes it to the data interaction module of the virtual display mobile terminal.

[0076] After the near-field communication link is established, the main control module retrieves the electricity metering data required by residential users or maintenance personnel from the storage module, generates data to be displayed according to industry display standards, and then encrypts it using the SM4 algorithm to generate encrypted data. This encrypted data is then actively pushed to the data interaction module of the virtual display mobile terminal at 1-second event cycles. It should be noted that this process can respond in real-time to data query commands and parameter configuration commands sent by the virtual display mobile terminal. The main control module retrieves electricity metering data from the storage module, which may also include time logs and parameter data, and encrypts it using the SM4 algorithm to generate encrypted data.

[0077] Step 5: The data interaction module decrypts and verifies the encrypted data and then transmits it to the virtual LCD rendering module of the virtual display mobile terminal. The virtual LCD rendering module matches the corresponding display mode and operable functions according to the permission level of the resident user or maintenance personnel, and displays the virtual LCD interface on the virtual display mobile terminal.

[0078] After receiving encrypted data, the data interaction module of the virtual display mobile terminal decrypts the encrypted data, verifies its correctness according to the protocol format verification frame, and then verifies the integrity of the data according to the MAC verification before transmitting the verified data to the virtual LCD rendering module. The virtual LCD rendering module matches the corresponding display mode and operable functions according to the permission level of the residential user or maintenance personnel, renders and generates a virtual LCD display interface, and refreshes the displayed data in real time, thus replacing the full display function of the traditional physical LCD of the electricity meter. When the permission level is that of a residential user, only the basic display mode is open, allowing the user to view real-time electricity consumption, remaining balance, historical electricity consumption details, etc. When the permission level is that of a maintenance personnel, they can freely switch between the basic and extended display modes, view all operating parameters, metering error data, event logs, and alarm records, and issue parameter configuration and on-site debugging commands through the virtual LCD interface. When the residential user or maintenance personnel closes the virtual display mobile terminal or the near-field communication link is disconnected for more than 30 seconds, the near-field communication module of the electricity meter terminal automatically switches to low-power broadcast mode, ending the data interaction.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A virtual liquid crystal display system for an energy meter without a physical display unit, characterized in that, This includes electricity meter terminals, virtual display mobile terminals, and near-field communication links; The electricity meter terminal includes a main control module, as well as a metering module, a near-field communication module, and a security authentication module, which are respectively connected to the main control module; the outer shell of the electricity meter terminal is printed with an identification mark; The virtual display mobile terminal includes a QR code pairing module, an identity authentication module, a data interaction module, and a virtual LCD rendering module; The QR code pairing module is used to initiate a pairing connection request to the near-field communication module after recognizing the identity identification mark. After the identity authentication module and the security authentication module complete two-way security authentication, a near-field communication link is established. The data interaction module acquires the electricity metering data collected by the metering module, and the virtual LCD rendering module generates a virtual LCD interface.

2. The virtual liquid crystal display system for an energy meter without a physical display unit according to claim 1, characterized in that, The metering module collects electrical energy metering data including voltage, current, active power, reactive power, forward active energy, reverse active energy, real-time energy, and time-of-use energy.

3. The virtual liquid crystal display system for an energy meter without a physical display unit according to claim 1, characterized in that, The near-field communication module is woken up after receiving a pairing connection request to establish a near-field communication link and then complete the data interaction between the virtual display mobile terminal and the main control module; when there is no data transmission time for more than 30 seconds, it automatically switches to low-power broadcast state.

4. The virtual liquid crystal display system for an energy meter without a physical display unit according to claim 1, characterized in that, The security authentication module has a built-in SM4 encryption chip that stores the electricity meter terminal's serial number, unique communication address, SM4 public and private key pair, and device identity certificate.

5. The virtual liquid crystal display system for an energy meter without a physical display unit according to claim 1, characterized in that, The system also includes a storage module for storing the electricity metering data collected by the metering module.

6. A method for virtual liquid crystal display of an energy meter without a physical display unit, implemented based on the virtual liquid crystal display system for an energy meter without a physical display unit as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: After the electricity meter terminal is powered on, the near-field communication module enters a low-power broadcast state; The metering module collects electricity metering data at a preset frequency; Step 2: The virtual display mobile terminal scans the identification mark of the electricity meter terminal and initiates a pairing connection request to the near-field communication module of the electricity meter terminal; Step 3: After receiving the pairing connection request, the electricity meter terminal completes two-way security authentication with the virtual display mobile terminal and establishes a near-field communication link. Step 4: The main control module generates data to be displayed from the electricity metering data, encrypts the data to be displayed to generate encrypted data, and then pushes it to the data interaction module of the virtual display mobile terminal. Step 5: The data interaction module decrypts and verifies the encrypted data and then transmits it to the virtual LCD rendering module of the virtual display mobile terminal. The virtual LCD rendering module matches the corresponding display mode and operable functions according to the permission level of the resident user or maintenance personnel, and displays the virtual LCD interface on the virtual display mobile terminal.

7. The virtual liquid crystal display method for an energy meter without a physical display unit according to claim 6, characterized in that, In step 1, after the electricity meter terminal is powered on, the main control module first completes the initialization operations of the metering module, near-field communication module, and security authentication module.

8. The virtual liquid crystal display method for an energy meter without a physical display unit according to claim 6, characterized in that, Step 2 specifically involves the virtual display mobile terminal calling the QR code pairing module. The QR code pairing module scans and parses the identification identifier of the electricity meter terminal to extract the unique communication address and pairing key index of the electricity meter terminal. Based on the unique communication address, it initiates a near-field communication pairing connection request to the near-field communication module of the electricity meter terminal at the specified address.

9. The virtual liquid crystal display method for an energy meter without a physical display unit according to claim 6, characterized in that, Step 3 specifically includes: Step 3-1: The identity authentication module of the virtual display mobile terminal initiates a pairing connection request to the security authentication module of the electricity meter terminal and generates a first random number; Step 3-2: The security authentication module performs permission verification, generates challenge parameters, and returns them to the identity authentication module; the challenge parameters include the first signature result, the device identity certificate of the electricity meter terminal, and the second random number; Step 3-3: The identity authentication module receives the challenge parameters, uses the pre-stored certificate to verify the device identity certificate of the electricity meter terminal, generates a second signature result, and returns it to the security authentication module. In steps 3-4, the security authentication module receives the second signature result, verifies the signature, and establishes a near-field communication link between the electricity meter terminal and the virtual display mobile terminal.

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