Identity card without battery, management and control device, identification system and management method

Abstract

The invention discloses a battery-free identity card, a management and control device, an identification system and a method. The identity card comprises an electronic ink screen, a control module, an NFC module and an NFC electricity obtaining module, the control module is in electric signal connection with the NFC module; the control module is in electric signal connection with the electronic ink screen and drives the electronic ink screen to display information; the NFC module is electrically connected with the NFC electricity obtaining module; the NFC electricity obtaining module obtains electric energy through the NFC module and stores the electric energy; the identity card management and control device comprises an NFC information interaction module and an NFC power supply module. The NFC information interaction module interacts information with the identity card through an NFC protocol; the NFC power supply module periodically inquires whether power supply of the identity card is ended or not through an NFC protocol; if the NFC power supply module receives the power supply requirement, the NFC power supply module starts an NFC wireless power supply field; and if the NFC power supply module does not need to supply power, the NFC power supply module is closed to start the NFC wireless power supply field.

Description

Technical Field

[0001] The present application belongs to the field of display technology application, and specifically relates to a battery-free identity card, a management device, an identification system and a management method. Background Art

[0002] Electronic paper is a display screen made using electrophoretic display technology. It achieves the effect of displaying images by driving electronic paper particles by continuously applying a driving waveform voltage to each pixel point through a driver IC chip. Electronic paper ink screen display has the characteristics of ultra-low power consumption, low-frequency display, and power saving. It has a wide range of applications in price tags, advertising signs, and bus stops.

[0003] The biggest advantage of the electronic paper ink screen is that it can still maintain the display content after power failure, and only consumes power when changing the display content. In the application scenarios of badges used for identity recognition, such as work badges, the advantage of the electronic paper ink screen that it can still display normally after power failure can be brought into play, and the battery-free identity card recognition system has unique application value.

[0004] At the same time, there are also problems in the application of NFC (Near Field Communication)-based work badges or name badges in the prior art. First, the NFC work badges or name badges need special printing or printing devices to print the employee's head portrait. Second, the management of access control permissions is not flexible, and special devices are required to set the corresponding permissions.

[0005] In places such as schools, companies or exhibitions, it is necessary to control the access rights of personnel. The access rights control of these places is complex, with long-term access control, short-term access control, or one-time access rights. Internet of Things cards based on electromagnetic induction, such as NFC-based work cards or badges, do not have enough interactive information and cannot achieve complex access control. They require special devices and manpower matching to complete, and are easily stolen by different people. If a conventional display screen is used to display the badge, since the display screen consumes power for real-time display, the badge or chest badge that needs to be charged frequently is not energy-saving and environmentally friendly, and also increases the burden of use.

[0006] In recent years, wireless charging has been widely used in many products, such as mobile phones, tablets, IoT and other portable products. This type of wireless charging generally has a power of several watts to tens of watts, and most of them use the Qi standard. Qi is a "wireless charging" standard launched by the Wireless Power Consortium (WPC), a standardization organization for wireless charging technology.

[0007] NFC was originally used for near field communication, but now it can be extended to low-power wireless charging. NFC (Near Field Communication NFC) wireless charging is based on the wireless charging transmitter and receiver composed of ST's NFC card reader and tag, which performs wireless energy transfer for charging. The NFC wireless charging specification is the latest NFC wireless charging protocol defined by the NFC Forum, which implements two protocol standard charging modes: static and interactive. NFC is a short-range, high-frequency radio technology. The standard stipulates that the communication distance of NFC is usually within 10 cm, the operating frequency is 13.56MHz, the rate is 26K or 106K bit / s, and it is compatible with ISO14443, Type-A, ISO15693, B and Felica standards.

[0008] In some NFC wireless charging solutions, NFC operates at a frequency of 13.56MHz, Qi wireless charging generally operates at a frequency of 100-200KHz, and the maximum transmission power of NFC wireless charging generally does not exceed 1W. The antenna of traditional Qi wireless charging is relatively large, with a geometric area of ​​10cm 2 Antennas of 100 MHz and above allow power transmission of up to tens of watts, while NFC wireless charging operates at a relatively high frequency, so the antenna size can be made smaller, about 1 cm 2 And below, it can charge small battery-powered devices (such as earbuds, fitness trackers, etc.). Technically, the difference between NFC wireless charging and Qi is that NFC wireless charging has the ability to transmit both energy and data, such as completing data interaction while powering on.

[0009] Based on the higher operating frequency of NFC, the application advantages of NFC wireless charging technology are: 1. Smaller antenna size. 2. Based on the principle of passive radio frequency identification, NFC technology can be completely passive on the tag side and does not require battery power. 3. Supports foreign object detection FOD, static and interactive charging modes, and flexible control of charging power. 4. Flexible PCB can be used as an antenna.

[0010] In the era of the Internet of Everything, low-power IoT terminal devices are increasingly being used, and low-power IoT devices also have charging requirements. The NFC wireless charging solution has solved the problem of low power requirements to a certain extent, and is more applicable to small, low-power devices. Currently, the NFC wireless charging solution has been applied to wearable devices such as wireless headphones, capacitive pens, smart watches, and smart glasses. The complete NFC wireless charging solution with wireless charging technical specifications, including the transmitter and receiver, provides a perfect choice for charging ultra-miniaturized devices.

[0011] In the prior art, school badges are generally made of paper or liquid crystal display screens. Paper school badges are not environmentally friendly and cannot be reused, and liquid crystal display school badges require batteries and are not energy-efficient. Therefore, there is an urgent need for a school badge that is both environmentally friendly and energy-efficient to replace the shortcomings of existing school badges. The present invention provides a school badge product that is both environmentally friendly and energy-efficient, does not require battery power, and uses NFC near-field communication technology to update the content of the school badge at any time. Summary of the invention

[0012] The technical problem to be solved by the present invention is to avoid the deficiency that the ID card in the ID card recognition system in the above-mentioned prior art needs a built-in battery to update the displayed information, and to provide an ID card that can update the display through external power supply of NFC, which has flexible management, higher security, and can more conveniently update the displayed information.

[0013] The technical solution of the present application to solve the above-mentioned technical problems is a battery-free identity card recognition system, comprising: an identity card management and control device, and more than two identity cards; the identity card management and control device comprises: an NFC information interaction module, an NFC power supply module; the identity card comprises: an electronic ink screen, a control module, an NFC module, and an NFC power acquisition module; the control module is electrically connected to the NFC module by signals; the control module is electrically connected to the electronic ink screen by signals, and the control module drives the electronic ink screen to display information; the NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module obtains electrical energy through the NFC module and stores electrical energy; the NFC information interaction module and the identity card exchange information through the NFC protocol; the NFC power supply module periodically inquires the identity card whether to end the power supply through the NFC protocol; if the NFC power supply module receives a request for power supply, the NFC power supply module starts the NFC wireless power supply field; if the NFC power supply module receives a request for power supply, the NFC power supply module shuts down the NFC wireless power supply field.

[0014] If the NFC power supply module does not receive the power supply information within the specified time, the NFC power supply module turns off the NFC wireless power supply field.

[0015] The technical solution of the present application to solve the above-mentioned technical problems can also be a battery-free identity card, comprising: an electronic ink screen, a control module, an NFC module, and an NFC power acquisition module; the control module is electrically connected to the NFC module by signals; the control module is electrically connected to the electronic ink screen by signals, and the control module drives the electronic ink screen to display information; the NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module obtains electrical energy through the NFC module, stores the electrical energy in a capacitor device, and the electrical energy in the capacitor device is used for electronic ink screen display; the identity card and an external identity card management and control device exchange information through the NFC protocol; the external identity card management and control device periodically inquires the identity card whether to end power supply through the NFC protocol; after the control module completes the electronic ink screen information display, it replies to the external identity card management and control device with power supply end information.

[0016] The above-mentioned electronic ink screen includes electronic ink screen A and electronic ink screen B; electronic ink screen A is used to display user photo information; electronic ink screen B is used to display text information.

[0017] The battery-free identity card also includes an indicator light, which is connected to the control module by electrical signals. When the NFC power acquisition module receives the power supply information, the control module controls the indicator light to light up periodically.

[0018] The above-mentioned identity card is an employee card or a campus card.

[0019] The technical solution of the present application to solve the above technical problems can also be an identity card management and control device, including: an NFC information interaction module and an NFC power supply module; the NFC information interaction module exchanges information with the identity card through the NFC protocol; the NFC power supply module periodically inquires the external identity card whether to end the power supply through the NFC protocol; if the NFC power supply module receives the power supply end information, the NFC power supply module stops the NFC wireless power supply field.

[0020] If the NFC power supply module does not receive the power supply end information within the specified time, the NFC power supply module turns off the NFC wireless power supply field; the above specified time is greater than 0.001 seconds and less than 0.1 seconds.

[0021] The technical solution of the present application to solve the above-mentioned technical problems can also be a battery-free identity card management method, including process A: NFC information interaction process; process B: NFC power supply process; in process A, the identity card management and control device discovers the identity card through the NFC protocol and exchanges data information with the identity card; in process B, the identity card management and control device periodically starts the NFC wireless power supply field; periodically inquires the identity card in process A whether to end the power supply, the identity card obtains power in the NFC wireless power supply field, uses the obtained power to drive the electronic ink screen display, and replies to end the power supply after the display is completed.

[0022] The above-mentioned battery-free identity card management method includes any one or more of the following features: Feature TA10: Process A includes an identity card activation process. During the identity card activation process, the identity card management and control device interacts with the identity card to exchange activation information. The activation information includes: card number information, user information, and any one of the user's photo; the received photo information is displayed in area A of the electronic screen in process B; Feature TA20: Process A includes an identity card authentication process. During the identity card authentication process, the identity card management and control device interacts with the identity card to exchange authentication information. The authentication information includes: key interaction information, card number information, user information, and any one of notification information; the received notification information is displayed in area B of the electronic screen in process B.

[0023] One of the beneficial effects of the technical solution in the present application is that the NFC information interaction module and the identity card exchange information through the NFC protocol; while ensuring information transmission, it can also realize NFC power supply, so that the identity card has the ability to update the displayed content in real time.

[0024] One of the beneficial effects of the technical solution in the present application is that the NFC power supply module periodically asks the ID card through the NFC protocol whether to end power supply; provides an FC wireless power supply field according to the power demand of the ID card; improves power supply efficiency and saves electricity, while ensuring the transmission of electricity required for updating the ID card display and ensuring the correct display.

[0025] One of the beneficial effects of the technical solution in the present application is that if the NFC power supply module does not receive the information requiring power supply within the specified time, the NFC power supply module turns off the NFC wireless power supply field, which can save energy and avoid wasting energy by providing the electric field in vain.

[0026] One of the beneficial effects of the technical solution in the present application is that the NFC power acquisition module obtains electrical energy through the NFC module and stores the electrical energy in a capacitor device, and the electrical energy in the capacitor device is used for the electronic ink screen display; the capacitor provides sufficient electrical energy for the identity card to refresh the display content at an extremely low cost, which is an efficient wireless power supply solution.

[0027] One of the beneficial effects of the technical solution in the present application is that the electronic ink screen A is used to display the user's photo information; the electronic ink screen B is used to display text information, and different display screens can be refreshed separately. When refreshing, only the corresponding display screen needs to be updated, which is more efficient and energy-saving.

[0028] One of the beneficial effects of the technical solution in the present application is that the indicator light is connected to the control module by electrical signals, the NFC power acquisition module receives the power supply information, and the control module controls the indicator light to light up periodically, so as to better display the status of the identity card and facilitate interaction.

[0029] One of the beneficial effects of the technical solution in this application is that the identity card branch is suitable for application scenarios of employee cards or campus cards.

[0030] One of the beneficial effects of the technical solution in the present application is that the identity card control device inquires the external identity card through the NFC protocol whether to end the power supply, providing a more efficient wireless power supply solution in general.

[0031] One of the beneficial effects of the technical solution in the present application is that if the NFC power supply module does not receive the power supply end information within the specified time, the NFC power supply module turns off the NFC wireless power supply field; the above-mentioned specified time is greater than 0.001 seconds and less than 0.1 seconds; it ensures that the identity card is powered during the process of refreshing the displayed content, and at the same time does not waste energy.

[0032] One of the beneficial effects of the technical solution in the present application is that the identity card management and control device discovers the identity card through the NFC protocol and exchanges data information with the identity card; the identity card management and control device periodically starts the NFC wireless power supply field; NFC can be used to simultaneously complete information interaction and power interaction, which is an efficient management method.

[0033] One of the beneficial effects of the technical solution in the present application is that the display contents of process A and process B are in different electronic screen areas. The setting of multiple electronic screen areas can more effectively manage the refresh of the display content, and only the necessary parts need to be refreshed, which saves more energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is one of the system block diagrams of the battery-free ID card recognition system;

[0035] Figure 2 This is the second system block diagram of the battery-free identity card recognition system;

[0036] Figure 3 This is the third system block diagram of the battery-free identity card recognition system;

[0037] Figure 4 This is the fourth system block diagram of the battery-free identity card recognition system;

[0038] Figure 5 This is the fifth system block diagram of the battery-free identity card recognition system;

[0039] Figure 6 This is the sixth system block diagram of the battery-free identity card recognition system;

[0040] Figure 7 is a schematic diagram of a battery-free ID card;

[0041] Figure 8 It is one of the flow diagrams of the battery-free identity card management method;

[0042] Fig. 9 This is the second flow chart of the battery-free identity card management method;

[0043] Fig.10 This is the third flow chart of the battery-free identity card management method;

[0044] Fig.11 This is the third flow chart of the battery-free identity card management method;

[0045] Fig.12 is a schematic block diagram of a battery-free ID card. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0047] It should be noted that the following is a description of the preferred embodiments of the present application, which does not constitute any limitation to the present application. The description of the preferred embodiments of the present application is only an explanation of the general principles of the present application. The embodiments described in this application are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and technical features numbered with Arabic numerals 1, 2, 3, etc., and numbers such as "A" and "B", are only used for descriptive purposes and are only for the convenience of explanation, and do not represent a sequential relationship in time or space; they cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and numbered with Arabic numerals 1, 2, 3, etc. may explicitly or implicitly include one or more of the features. In the description of the present application, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0049] like Figure 1 to Figure 2 ,In an embodiment of a battery-free identity card recognition system, the system includes: two or more identity cards, an identity card control device; Figure 1 and Figure 2 The battery-free ID card recognition system includes three ID cards, namely ID card A, ID card B, and ID card C.

[0050] like Figure 2 In an embodiment of a battery-free identity card recognition system, the identity card management and control device includes: an NFC information interaction module and an NFC power supply module. The NFC information interaction module and the identity card exchange information through the NFC protocol.

[0051] like Figures 8 to 11In an embodiment of a battery-free identity card recognition system, an NFC power supply module periodically inquires the identity card through the NFC protocol whether to end power supply; if the NFC power supply module receives a signal that power supply is required, the NFC power supply module starts the NFC wireless power supply field; if the NFC power supply module receives a signal that power supply is not required, the NFC power supply module shuts down the NFC wireless power supply field.

[0052] like Figure 3 In an embodiment of a battery-free identity card recognition system, the identity card includes: an electronic ink screen, a control module, an NFC module, and an NFC power acquisition module; the control module is electrically connected to the NFC module; the control module is electrically connected to the electronic ink screen, and the control module drives the electronic ink screen to display information; the NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module acquires power through the NFC module and stores power. If the NFC power supply module does not receive power supply information within a specified time, the NFC power supply module turns off the NFC wireless power supply field.

[0053] like Figure 3 In an embodiment of a battery-free identity card, the card includes: an electronic ink screen, a control module, an NFC module, and an NFC power acquisition module; the control module is electrically connected to the NFC module by signals; the control module is electrically connected to the electronic ink screen by signals, and the control module drives the electronic ink screen to display information; the NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module acquires electrical energy through the NFC module, and stores the electrical energy in a capacitor device, and the electrical energy in the capacitor device is used for displaying the electronic ink screen.

[0054] like Figures 8 to 11 The identity card and the identity card control device exchange information through the NFC protocol; the identity card control device periodically asks the identity card whether to end the power supply through the NFC protocol; after the control module completes the electronic ink screen information display, it replies to the identity card control device with the power supply end information.

[0055] like Figures 5 to 7 In an embodiment of a battery-free ID card, the electronic ink screen includes an electronic ink screen A and an electronic ink screen B; the electronic ink screen A is used to display user photo information; and the electronic ink screen B is used to display text information.

[0056] like Figures 4 to 6 In an embodiment of a battery-free identity card, an indicator light is further included, and the indicator light is electrically connected to the control module. When the NFC power acquisition module receives the power supply information, the control module controls the indicator light to light up periodically.

[0057] like Figures 4 to 7 In one embodiment of a battery-free ID card recognition system, the ID card is an employee card or a campus card. Figure 7The identity card is a campus card. The electronic ink screen A is used to display photos; the electronic ink screen B is used to display other information, including the card balance and notification information.

[0058] like Figure 2 In an embodiment of an identity card management and control device, the device includes: an NFC information interaction module and an NFC power supply module; the NFC information interaction module exchanges information with the identity card through the NFC protocol; the NFC power supply module periodically inquires the identity card whether to end power supply through the NFC protocol; if the NFC power supply module receives the power supply end information, the NFC power supply module stops the NFC wireless power supply field.

[0059] like Figures 8 to 11 If the NFC power supply module does not receive the power supply end information within the specified time, the NFC power supply module turns off the NFC wireless power supply field; the above specified time is greater than 0.001 seconds and less than 0.1 seconds.

[0060] like Figures 8 to 11 In an embodiment of a battery-free identity card management method, the method includes process A: NFC information interaction process; process B: NFC power supply process; in process A, the identity card management and control device discovers the identity card through the NFC protocol and exchanges data information with the identity card; in process B, the identity card management and control device periodically starts the NFC wireless power supply field; periodically inquires the identity card in process A whether to end the power supply, the identity card obtains power in the NFC wireless power supply field, uses the obtained power to drive the electronic ink screen display, and replies to end the power supply after the display is completed.

[0061] like Figures 9 to 11 In an embodiment of a battery-free ID card management method, process A includes an ID card activation process. During the ID card activation process, the ID card management and control device interacts with the ID card to exchange activation information. The activation information includes: any one of: card number information, user information, and user photo; the received photo information is displayed in area A of the electronic screen in process B.

[0062] like Figures 9 to 11 In an embodiment of a battery-free identity card management method, process A includes an identity card authentication process. During the identity card authentication process, the identity card control device interacts with the identity card to exchange authentication information. The authentication information includes: any one of key interaction information, card number information, user information, and notification information; the received notification information is displayed in area B of the electronic screen in process B.

[0063] like Fig. 9In an embodiment of a battery-free identity card management method, during a campus card activation process, the campus card management terminal reads the encrypted information in the campus card; obtains the card number information and unused information; the campus card management terminal sends the activation information, encrypted information, photos, and electronic ink screen A display information to the campus card; the campus card management terminal receives the campus card reply information. In process B, the campus card management terminal obtains whether the campus card displays a success message. If the completion display message is received, the NFC stops powering.

[0064] like Fig.10 In an embodiment of a battery-free identity card management method, in a daily information update process of a campus card, the campus card management terminal reads the encrypted information in the campus card; obtains the card number information and user information; the campus card management terminal sends the electronic ink screen B display information to the campus card; the campus card management terminal receives the campus card reply information. In process B, the campus card management terminal obtains whether the campus card displays the success information. If the completion display information is received, the NFC stops powering.

[0065] like Fig.11 In an embodiment of a battery-free identity card management method, the campus card management and control terminal performs a power supply inquiry during the NFC power supply interval, and the campus card responds to the power supply in the corresponding time slot; the campus card management and control terminal drives the electronic ink screen of the campus card during the NFC power supply period.

[0066] like Fig.12 In an embodiment of a battery-free identity card, the control module includes a main control MCU; the main control MCU drives the electronic paper screen, i.e., the electronic ink screen, through an electronic paper driving circuit; the power management module includes an NFC control module, and the NFC control module is electrically connected to the NFC coil through an NFC matching circuit to realize NFC power supply and information interaction.

[0067] The present invention relates to the field of electronic paper and NFC near field communication technology, a battery-free identity card, a control device, an identification system and a management method. The product includes: an electronic paper display screen, a drive circuit module, an NFC control module, a matching circuit, an induction coil, a main control circuit module, a storage circuit module, a power management module, an indicator light, etc.; when the calibration card is close to the NFC card reader, the voltage is induced by the NFC coil to power the communication module, the main control circuit, and the electronic paper display screen, and the image information to be displayed is transmitted to the main control circuit through the coil. During the data transmission process, the indicator light starts to flash to prompt that the circuit is working, and the main control circuit writes the data into the storage circuit module. When the image information is transmitted and verified to be correct, the image information is displayed on the electronic paper display screen through the drive circuit module. Because the characteristic of electronic paper is that it can maintain display even when the power is off, when the calibration card leaves the card reader, it can still maintain display even without battery power.

[0068] It is more energy-efficient and environmentally friendly than traditional school badges. It can be reused and the school badge information can be updated at any time. It does not require batteries, making it safer and more energy-efficient to use.

[0069] As shown in the accompanying drawings, the above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the invention specification and the accompanying drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery-free identity card recognition system, characterized in that: include: ID card control device, two or more ID cards; The identity card control device includes: NFC information interaction module, NFC power supply module; The ID card includes: electronic ink screen, control module, NFC module, and NFC power acquisition module; The control module is connected to the NFC module by electrical signals; The control module is connected to the electronic ink screen by electrical signals, and the control module drives the electronic ink screen to display information; The NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module acquires power through the NFC module and stores the power; The NFC information interaction module and the ID card exchange information through the NFC protocol; The NFC power supply module periodically asks the ID card whether to end power supply through the NFC protocol; if the NFC power supply module receives a request for power supply, the NFC power supply module starts the NFC wireless power supply field; If the NFC power supply module receives a signal that power is not needed, the NFC power supply module turns off the NFC wireless power supply field.

2. The battery-free identity card recognition system according to claim 1, characterized in that: If the NFC power supply module does not receive the power supply information within the specified time, the NFC power supply module turns off the NFC wireless power supply field.

3. A battery-free ID card, characterized in that: include: Electronic ink screen, control module, NFC module, NFC power acquisition module; The control module is connected to the NFC module by electrical signals; The control module is connected to the electronic ink screen by electrical signals, and the control module drives the electronic ink screen to display information; The NFC module is electrically connected to the NFC power acquisition module; the NFC power acquisition module obtains electric energy through the NFC module and stores the electric energy in the capacitor device, and the electric energy in the capacitor device is used for the electronic ink screen display; The ID card and the external ID card control device exchange information through the NFC protocol; The external ID card control device periodically asks the ID card whether to end power supply through the NFC protocol; After the control module completes the electronic ink screen information display, it replies to the external identity card control device to end the power supply information.

4. The battery-free ID card according to claim 3, characterized in that: The electronic ink screen includes an electronic ink screen A and an electronic ink screen B; the electronic ink screen A is used to display user photo information; and the electronic ink screen B is used to display text information.

5. The battery-free ID card according to claim 3, characterized in that: It also includes an indicator light, which is connected to the control module by electrical signals. When the NFC power acquisition module receives power supply information, the control module controls the indicator light to light up periodically.

6. The battery-free ID card according to claim 3, 4 or 5, characterized in that: The identity card is an employee card or a campus card.

7. An identity card control device, It is characterized in that Including: NFC information interaction module, NFC power supply module; The NFC information interaction module and the ID card exchange information through the NFC protocol; The NFC power supply module periodically asks the external ID card whether to end power supply through the NFC protocol; If the NFC power supply module receives the power supply end information, the NFC power supply module stops the NFC wireless power supply field.

8. The identity card control device according to claim 7, characterized in that: If the NFC power supply module does not receive the power supply end information within the specified time, the NFC power supply module turns off the NFC wireless power supply field; the specified time is greater than 0.001 seconds and less than 0.1 seconds.

9. A battery-free ID card management method, characterized in that: include: Process A: NFC information interaction process; Process B: NFC power supply process; In process A, the ID card control device discovers the ID card through the NFC protocol. Interacting data information with identity card; In process B, the identity card control device periodically starts the NFC wireless power supply field; it periodically asks the identity card in process A whether to end the power supply. The identity card obtains power in the NFC wireless power supply field, uses the power obtained to drive the electronic ink screen display, and replies to end the power supply after the display is completed.

10. The battery-free ID card management method according to claim 9, characterized in that: Includes any one or more of the following features: Feature TA10: Process A includes an identity card activation process. During the identity card activation process, the identity card control device exchanges activation information with the identity card. The activation information includes: any one of the card number information, user information, and user photo; the received photo information is displayed in the electronic screen A area in process B; Feature TA20: Process A includes an identity card authentication process. During the identity card authentication process, the identity card control device and the identity card exchange authentication information. The authentication information includes: key interaction information, card number information, user information, and notification information. The received notification information is displayed in area B of the electronic screen during process B.

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