CN112488274A - Intelligent card with screen and one-card-pass system - Google Patents
Intelligent card with screen and one-card-pass system Download PDFInfo
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- CN112488274A CN112488274A CN202011398337.4A CN202011398337A CN112488274A CN 112488274 A CN112488274 A CN 112488274A CN 202011398337 A CN202011398337 A CN 202011398337A CN 112488274 A CN112488274 A CN 112488274A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07701—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction
- G06K19/07703—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction the interface being visual
- G06K19/07707—Constructional details, e.g. mounting of circuits in the carrier the record carrier comprising an interface suitable for human interaction the interface being visual the visual interface being a display, e.g. LCD or electronic ink
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
- G06Q20/34—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using cards, e.g. integrated circuit [IC] cards or magnetic cards
- G06Q20/341—Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
- G06Q20/36—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes
- G06Q20/367—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes involving electronic purses or money safes
- G06Q20/3672—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes involving electronic purses or money safes initialising or reloading thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/30—Payment architectures, schemes or protocols characterised by the use of specific devices or networks
- G06Q20/36—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes
- G06Q20/367—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes involving electronic purses or money safes
- G06Q20/3674—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using electronic wallets or electronic money safes involving electronic purses or money safes involving authentication
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Finance (AREA)
- Computer Hardware Design (AREA)
- Computer Networks & Wireless Communication (AREA)
- Strategic Management (AREA)
- General Business, Economics & Management (AREA)
- User Interface Of Digital Computer (AREA)
Abstract
The invention relates to a smart card with a screen and a card communication subsystem. The invention provides a smart card with a screen and a one-card subsystem based on the smart card; a smart card with a screen is a smart card which can perform data interaction with a smart phone embedded with an NFC module; a card-through subsystem based on a smart card with a screen comprises the smart card with the screen, a server, a network terminal, a smart phone write-only terminal and a special consumption reader-writer; the one-card subsystem drives a screen smart card to display balance information and user identity information of the electronic wallet; the invention can not only improve the business handling efficiency, but also has high recycling value.
Description
Technical Field
The invention relates to the field of all-purpose card systems, in particular to an intelligent card with a screen and an all-purpose card subsystem.
Background
With the development of science and technology and the strong promotion of national information construction, the one-card system technology has been accepted and applied by many units and enterprises. There are many functions that can be realized by using the all-purpose card system, such as: dining room consumption, supermarket consumption, bath charging, entrance guard verification, book borrowing, employee attendance and the like.
The smart card is an important component of a card system, which consists of a chip and an induction antenna and is completely sealed in a plastic card without exposed parts. Although smart cards have been very convenient in practical use, there are still areas where improvements are needed. The first, current smart cards are not able to directly display the electronic purse balance stored in the card, which causes much inconvenience to the card holder when the card is swiped for consumption. Second, current smart card products print the identity information of the card-holding user on the plastic surface of the smart card, and although the identity information of the user can be effectively displayed in this way, this also causes many limitations and inconveniences to the use of the smart card, such as: firstly, when a user wants to change identity information, the user only needs to replace a new card to print again, which is very troublesome; secondly, when a certain smart card is not used any more, the smart card can only be left unused and cannot be recycled due to cost reasons and operation difficulty, and waste is caused; third, the content of the information printed on the surface of the existing smart card is generally fixed, and the fixed content cannot meet the personalized requirements of users.
In the existing one-card system, a user must hold a certificate of validity to a charging center or a self-service machine to handle the loss reporting/releasing service of the smart card. Such a mechanism is inefficient and may also allow the user to miss the optimal time for a missed operation, resulting in a stolen swipe of the smart card. Similarly, the lost and subsidized service of the smart card is also the same, and the user needs to spend a certain time at the charging center to wait for the completion of the service transaction, and may need to wait in a queue in special cases. Therefore, there is room for improvement in these business transaction mechanisms of the one-card system as a whole.
Disclosure of Invention
The invention provides a smart card with a screen and a one-card-based subsystem aiming at the defects in the conventional one-card system.
In order to solve the problems, the invention adopts the specific technical scheme that:
a smart card with a screen is a smart card which can carry out data interaction with a smart phone embedded with an NFC module, and comprises an NFC circuit module, a microcontroller circuit module, an electronic ink screen control circuit module and an electronic ink screen module; and the NFC circuit module is used for communicating with reader-writer equipment with an NFC module and acquiring energy from the reader-writer equipment to supply power to the whole intelligent card. The NFC circuit module consists of an NFC chip and an induction antenna, and electronic wallet data and user identity data can be stored in the NFC chip; the microcontroller circuit module is used for reading and processing electronic wallet data and user identity data stored in the NFC chip and controlling the electronic ink screen control circuit module to work; and the electronic ink screen control circuit module drives the electronic ink screen to display balance information of the electronic wallet and identity information of a user.
A card-pass subsystem based on a smart card with a screen comprises the smart card with the screen, a server, a network server, a smart phone reading and writing end and a special consumption reader-writer; the one-card subsystem of the invention has two data communication links, which are respectively: the server and the network end-the smart phone read-write end-the smart card with the screen and the server and the network end-the special consumption reader-the smart card with the screen.
The smart phone reading and writing end comprises a smart phone with an NFC module and a one-card APP in the smart phone.
Preferably, the smart card is a passive smart card.
Preferably, the microcontroller circuit module adopts an ultra-low power consumption microcontroller chip.
Preferably, the operation of changing, processing and refreshing the balance information of the electronic wallet and the user identity information is regarded as two independent applications of the one-card subsystem, and a special consumption reader-writer and a smart phone reading-writing terminal are respectively used as reading-writing equipment of the two one-card applications.
Specifically, the electronic wallet information and the user identity information are displayed in different areas of the electronic ink screen, wherein the electronic wallet information display area is relatively small, and the format and the position of information display are fixed.
Preferably, when the data of the electronic wallet is changed, the smart card refreshes the data only in the electronic wallet information display area of the screen, and other areas of the screen do not perform refreshing operation; the purpose of this is to reduce as much as possible the energy consumption of the e-wallet data refresh.
Preferably, the electronic ink screen control circuit module can support the electronic ink screen to refresh only in the electronic wallet information display area, and the refresh is a partial refresh.
Preferably, when the user identity information data is changed, the smart card is configured to refresh all information display areas on its screen, and the refresh is a global refresh, because it is not necessary to guarantee a short data interaction time as in the case of the electronic wallet application. The purpose of this is to reduce the probability of the electronic ink screen appearing ghost.
Optionally, if the screen of the smart card has a ghost, the user may actively eliminate the ghost by using the smart phone.
Specifically, the microcontroller circuit module may determine which information is changed by detecting a level change of two pins of the NFC chip or by detecting a value change of an information modification flag stored in the NFC chip.
Preferably, the electronic ink screen has a bistable characteristic, and can still display the originally displayed content even if power is off.
Preferably, the user can change the user identity information on the screen of the smart card through a smart phone with an NFC module and an all-purpose card APP installed in the smart phone, specifically, the user edits the identity information in the all-purpose card APP at first, then the all-purpose card APP calls the NFC module in the smart phone, then the NFC module in the smart phone is driven to carry out data communication and energy transmission with an NFC circuit module in the smart card, and finally the smart card finishes the operation of changing, processing and refreshing the identity information through the received data and energy.
Optionally, the smart card of the present invention may also be used in conjunction with a smart phone embedded with an NFC module to generate other interesting applications; such as displaying personalized background patterns on the smart card screen, or regarding the smart card as a note, for recording and displaying important information, etc.; the implementation of this type of application is similar to the above-described solution.
Preferably, the one-card APP has a function of updating user identity information on the smart card, and can also realize functions of loss reporting/releasing, loss subsidy application, data submission, encryption and the like of the smart card by driving the smart phone to perform data exchange with the server and the network side.
Specifically, the smart card has a high recycling value, so that the smart card APP can also have a smart card recycling transaction function.
Optionally, the one-card APP may add other functions, such as: the intelligent card online recharging function, the canteen takeaway ordering function, the canteen new dish pushing function, the dish color evaluation scoring function, the complaint function and the like.
Preferably, the one-card-pass APP can be used only by inputting a password, so that the security of the system is enhanced.
The invention has the beneficial effects that:
a smart card with a screen is provided, which can display the balance of an electronic purse and user identity information on its screen. The user can also use a smart phone embedded with an NFC module to change the user identity information at any time. The smart card not only can be used by a user for swiping the card for consumption, but also has larger value of recycling.
In the system, besides two types of applications of processing the electronic wallet information and the user identity information, a user can also handle loss reporting/releasing business of the smart card, loss compensation business of the smart card, user data submitting business and the like through a one-card-through APP in the smart phone. Putting the services into the mobile phone APP for transaction can improve the transaction efficiency and save the time of the user.
Thirdly, the invention regards the operations of changing, processing and refreshing the balance information of the electronic wallet and the identity information of the user as two independent applications of the one-card subsystem in the aspect of specific technical realization; and the software and hardware scales of the two applications are different by calling according to the difference of the time and energy required by the two applications. Therefore, different resources can be matched according to the characteristics of different applications, and the efficiency of the whole subsystem is optimal.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the smart card of the present invention.
FIG. 2 is a schematic diagram of the system architecture of the one-card subsystem of the present invention.
Fig. 3 is a schematic diagram of the front structure of the smart card of the present invention.
Fig. 4 is a schematic diagram of an internal circuit structure of the smart card of the present invention.
FIG. 5 is a flowchart of an exemplary application 1 of the present invention
Fig. 6 is a flowchart of an exemplary application 2 according to an embodiment of the present invention.
FIG. 7 is a flowchart of an exemplary application 3 of the present invention.
Detailed Description
The invention is further described below by means of specific embodiments, but not limited to these embodiments, in conjunction with the attached drawings.
As shown in fig. 1, a smart card with a screen includes an NFC circuit module 11, a microcontroller circuit module 12, an electronic ink screen control circuit module 13, and an electronic ink screen module 14. The NFC circuit module 11 is configured to communicate with a read-write device having an NFC module, and obtain energy from the read-write device to supply power to the entire smart card; the NFC circuit module consists of an NFC chip and an induction antenna, wherein electronic wallet information and user identity information can be stored in the NFC chip. The microcontroller circuit module 12 first determines whether any of the two types of information stored in the NFC circuit module 11 is modified, and if any of the two types of information is modified, runs a processing program for the certain type of information; if no information of which type is modified, it and the following modules do not work. Specifically, when the modified information is the electronic wallet information, the micro controller circuit module 12 only reads the electronic wallet data in the NFC chip, and immediately starts to run a corresponding program to process the data after the reading is completed, and finally transmits the processed data and a corresponding control command a to the electronic ink screen control circuit module 13 after the data is processed; when the modified information is the user's identity information, the micro-controller circuit module 12 will not only read the user's identity data but also read the data of the electronic wallet, and immediately starts to run the corresponding program to process the two types of data after the reading is completed, and finally transmits the processed data and the corresponding control command B to the electronic ink screen control circuit module 13 after the data processing is completed. The electronic ink screen control circuit module 13 firstly receives the data and the command output by the microcontroller circuit module 12, and then drives the electronic ink screen to display information according to the received data and command; specifically, when the electronic wallet data and the control command a are received, the electronic ink screen control circuit module 13 drives the electronic ink screen to refresh the display information only in the electronic wallet balance display area, and the refresh is a local refresh; when the user identity data, the electronic wallet data and the control command B are received, the electronic ink screen control circuit module 13 drives the electronic ink screen to refresh the display information on the whole screen, and the refresh is global refresh. The originally displayed information can still be displayed after the electronic ink screen is powered off.
As shown in fig. 2, a one-card-pass subsystem based on a smart card with a screen includes a smart card with a screen 24, a server and network 21, a smart phone reader 23, and a special consumption reader 22; the subsystem has two bidirectional communication links, which are respectively: the server and the network end-the smart phone read-write end-the smart card with the screen and the server and the network end-the special consumption reader-the smart card with the screen.
As shown in fig. 3, the smart card of the present invention has a rectangular housing, specifically a card, and has a certain thickness. The front structure comprises a plastic shell 31 and an intermediate electronic ink screen 32, wherein the electronic ink screen 32 is embedded in the plastic shell 31. Where the black area 331 is shown as an electronic wallet information display area and the other areas are display areas for user identity information or other information.
As shown in fig. 4, the internal circuit structure of the smart card of the present invention includes a coil 41, an NFC chip 42, a microcontroller circuit module 12, and an electronic ink screen control circuit module 13.
As shown in fig. 5, in example 1, when a user is ready to use a one-card APP to transact a one-card service, the workflow of this example is as follows: step one, a user operates a card APP in a smart phone; step two, the one-card APP drives the network communication module of the smart phone to communicate with the server and the network end of the one-card system; step three, the communication parties complete the business transaction after data exchange for a plurality of times.
As shown in fig. 6, in case 2, when the user is ready to pay by swiping a smart card, the workflow of this case is as follows: step one, an NFC circuit module of the smart card acquires energy from a special consumption reader and starts to communicate with the special consumption reader; step two, the microcontroller circuit module of the smart card judges whether the electronic wallet information stored in the NFC chip is modified, if so, the microcontroller circuit module reads the modified electronic wallet information from the NFC chip; step three, after the reading is finished, the microcontroller circuit module starts a corresponding program to process the data and generate a control command A; step four, the microcontroller circuit module transmits the processed data and the control command A to the electronic ink screen control circuit module; and step five, the electronic ink screen control circuit module drives the electronic ink screen to update the information of the electronic wallet only, and the refreshing mode in the updating process is partial refreshing.
As shown in fig. 7, in example 3, when the user uses the smart phone to change the user identity information displayed on the smart card screen, the workflow of this example is as follows: step one, a user edits identity information to be displayed on a smart card screen in a smart phone one-card APP; step two, a user operates the APP to drive the NFC module in the mobile phone to work, specifically, the NFC module in the mobile phone communicates with the smart card while transmitting energy to the smart card, so that energy and information transmission from the mobile phone to the smart card is completed; step three, after the data received by the smart card is completely written in the NFC chip, a microcontroller circuit module of the smart card starts to judge whether the user identity data stored in the NFC chip is modified, and if so, the microcontroller circuit module reads the user identity data and the electronic wallet data from the NFC chip; after reading, the microcontroller circuit module starts a corresponding program to process the two types of data and generate a control command B; step five, the microcontroller transmits the processed data and the control command B to the electronic ink screen control circuit module; and step six, the electronic ink screen control circuit module drives the electronic ink screen to update the information of the whole screen of the electronic ink screen, and the refreshing mode in the updating process is global refreshing. It should be understood that parts of the specification not set forth in detail are well within the prior art.
Claims (10)
1. A smart card with a screen, which can perform information interaction with a smart phone, is characterized by comprising an NFC circuit module, a microcontroller circuit module, an electronic ink screen control circuit module and an electronic ink screen module;
the NFC circuit module is used for communicating with reader-writer equipment with an NFC module and acquiring energy from the reader-writer equipment to supply power to the whole intelligent card; the NFC circuit module consists of an NFC chip and an induction antenna, and electronic wallet data and user identity data are stored in the NFC chip;
the microcontroller circuit module is used for reading and processing electronic wallet data and user identity data stored in the NFC chip and controlling the electronic ink screen control circuit module to work;
and the electronic ink screen control circuit module drives the electronic ink screen to display payment amount information, electronic wallet balance information and user identity information.
2. A card-pass subsystem based on a smart card with a screen is characterized by comprising the smart card with the screen, a server, a network terminal, a smart phone reading and writing terminal and a special consumption reader-writer; the subsystem has two data communication links, which are respectively: the server and the network end-the smart phone read-write end-the smart card with the screen and the server and the network end-the special consumption reader-the smart card with the screen.
3. The all-purpose card subsystem according to claim 2, wherein the smart phone read/write end comprises a smart phone with an NFC module and an all-purpose card APP in the smart phone.
4. The one-card subsystem of claim 2, wherein: the intelligent card with the screen is a passive intelligent card.
5. The one-card subsystem of claim 2, wherein: the method comprises the following steps of regarding the operations of changing, processing and refreshing display of payment amount information, electronic wallet balance information and user identity information as two independent applications of the all-purpose card subsystem; and the special consumption reader-writer and the smart phone reading-writing end are respectively used as reading-writing equipment applied to the two all-purpose cards.
6. The one-card subsystem of claim 2, wherein: when the electronic wallet data is changed, the smart card refreshes the data only in the electronic wallet information display area of the electronic ink screen module.
7. The one-card subsystem of claim 2, wherein: the electronic ink screen control circuit module can support the electronic ink screen module to refresh data only in partial area of the screen, and the refresh is partial refresh.
8. The one-card subsystem of claim 2, wherein: when the user identity information data is changed, the smart card is set to refresh all areas of the whole screen at the moment, and the refreshing is global refreshing.
9. The one-card subsystem of claim 2, wherein: the user changes the user identity information on the screen of the smart card through the smart phone with the NFC module and the one-card APP installed in the smart phone, specifically, the user edits the identity information in the one-card APP at first, then the one-card APP calls the NFC module in the smart phone, then the NFC module in the smart phone is driven to carry out data communication and energy transmission with the NFC circuit module in the smart card, and finally the smart card completes the change-processing-refreshing display operation of the identity information through the received data and energy.
10. The one-card-pass APP of claim 2, wherein: besides the function of updating the user identity information on the smart card, the smart phone is driven to communicate with the server and the network terminal, and the functions of loss reporting/releasing, loss subsidizing application and data submitting of the smart card can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398337.4A CN112488274A (en) | 2020-12-03 | 2020-12-03 | Intelligent card with screen and one-card-pass system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398337.4A CN112488274A (en) | 2020-12-03 | 2020-12-03 | Intelligent card with screen and one-card-pass system |
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| CN112488274A true CN112488274A (en) | 2021-03-12 |
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| CN202011398337.4A Pending CN112488274A (en) | 2020-12-03 | 2020-12-03 | Intelligent card with screen and one-card-pass system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108108802A (en) * | 2017-12-06 | 2018-06-01 | 河北吕望信息科技有限公司 | Visible card and its remaining sum display methods |
| CN110728347A (en) * | 2019-09-16 | 2020-01-24 | 中云信安（深圳）科技有限公司 | Solid electronic card and method for updating card surface display information of solid electronic card |
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- 2020-12-03 CN CN202011398337.4A patent/CN112488274A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108108802A (en) * | 2017-12-06 | 2018-06-01 | 河北吕望信息科技有限公司 | Visible card and its remaining sum display methods |
| CN110728347A (en) * | 2019-09-16 | 2020-01-24 | 中云信安（深圳）科技有限公司 | Solid electronic card and method for updating card surface display information of solid electronic card |
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