Visual card

Abstract

The utility model provides a visual card, which is applied to the technical field of intelligent cards, and comprises a non-connection electricity taking module used for sensing an electromagnetic field emitted by external card reading equipment to obtain electric energy and supplying power to a safety module. The first detection module is used for detecting the enabling state of the main control module and sending a first detection signal to the safety module when it is detected that the main control module is in the enabling state. And the safety module is used for establishing communication connection with the main control module when receiving the first detection signal sent by the first detection module, and is also used for performing non-contact communication with external card reading equipment through the non-contact power taking module and sending key data obtained by non-contact communication to the main control module. The main control module is used for sending the key data to the display module and controlling the display module to display the key data. The power module is used for supplying power to the master control module and the display module. The problem of communication chaos between the main control module and the security module can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smart cards, and in particular to a visual card. BACKGROUND

[0002] A dual-interface display card is a visual card combining two power supply modes. In a non-contact electromagnetic field, the visual card is powered by non-contact power supply, and after leaving the non-contact electromagnetic field, the visual card is powered by a built-in battery. Through the cooperation of the two power supply modes, the visual card can work normally in different scenes, improve the flexibility and reliability of the visual card, and maximize the power consumption of the built-in battery and improve the service life of the built-in battery.

[0003] However, the process of cooperation of the two power supply modes requires the visual card to be powered on before entering the non-contact electromagnetic field, and the visual card can obtain power by non-contact power supply after entering the non-contact electromagnetic field. If the visual card is powered on after entering the non-contact electromagnetic field, the security chip can directly obtain power from the non-contact electromagnetic field by non-contact power supply and work normally. However, at this time, the security chip cannot learn the working state of the MCU in time, which will cause the communication logic between the MCU and the security chip to be confused. CONTENT OF THE INVENTION

[0004] The present application aims to provide a visual card to solve the problem that when the visual card is powered on after entering the non-contact electromagnetic field, the security module has already worked normally, but the main control module needs to be initialized, so that the security module cannot learn the working state of the main control module in time, and the communication between the main control module and the security module is confused.

[0005] In a first aspect, the present application provides a visual card, which comprises a non-contact power supply module, a security module, a main control module, a display module, a first detection module and a power module.

[0006] The non-contact power module is connected with the security module. The non-contact power module is configured to induct an electromagnetic field generated by an external card reading device to obtain power, and supply power to the security module. The first detection module is connected with the security module and the master control module. The first detection module is configured to detect an enabling state of the master control module, and send a first detection signal to the security module when detecting that the master control module is in the enabling state. The security module is connected with the master control module. The security module is configured to, when receiving the first detection signal sent by the first detection module, establish a communication connection with the master control module, and perform non-contact communication with the external card reading device through the non-contact power module, and send key data obtained through the non-contact communication to the master control module. The master control module is connected with the display module. The master control module is configured to send the key data to the display module, and control the display module to display the key data. The power module is connected with the master control module and the display module, and is configured to supply power to the master control module and the display module.

[0007] In a possible implementation, the non-contact power module includes an NFC coil and a power taking circuit. The NFC coil is connected with the power taking circuit. The NFC coil is configured to induct an alternating current generated by the electromagnetic field generated by the external card reading device, and perform non-contact communication with the external card reading device. The power taking circuit is connected with the security module. The power taking circuit is configured to convert the alternating current generated by the NFC coil into direct current, and deliver the direct current to the security module.

[0008] In a possible implementation, the power taking circuit includes a rectification unit and a voltage stabilizing unit. The rectification unit is connected with the NFC coil and the voltage stabilizing unit. The rectification unit is configured to convert the alternating current generated by the NFC coil into direct current, and deliver the direct current to the voltage stabilizing unit. The voltage stabilizing unit is connected with the security module. The voltage stabilizing unit is configured to stabilize and filter the direct current delivered by the rectification unit to obtain a constant voltage, and deliver the constant voltage to the security module.

[0009] In a possible implementation, the first detection module is specifically a detection resistor. A first connection end of the detection resistor is connected with the security module and the master control module, and a second connection end of the detection resistor is connected with the power module. In a case where the non-contact power module supplies power to the security module and the master control module is not powered on, the first connection end is set to a high level, and the second connection end is at a high level. When the master control module is powered on, the master control module sets the first connection end of the detection resistor to a low level. When the detection resistor detects that the first connection end changes from the high level to the low level, it is determined that the master control module is in the enabling state, and the first detection signal is sent to the security module.

[0010] In a possible implementation, when the visual card is in the electromagnetic field, the master control module is configured to, after being powered on and completing initialization, pull the level of the first connection end of the detection resistor low, so that the first connection end is set from high level to low level. The security module is configured to, after sensing that the master control module is powered on through the first connection end of the detection resistor, send communication information to the master control module.

[0011] In a possible implementation, the visual card further includes a second detection module. The second detection module is connected with the non-taken power module and the security module. The second detection module is configured to, when the visual card enters the electromagnetic field, send an entry signal to the master control module, and when the visual card leaves the electromagnetic field, send a leaving signal to the master control module.

[0012] In a possible implementation, the visual card further includes a second detection module. The second detection module is connected with the non-taken power module and the security module. The second detection module is configured to, when the visual card enters the electromagnetic field, send an entry signal to the master control module, and when the visual card leaves the electromagnetic field, send a leaving signal to the master control module.

[0013] In a possible implementation, the second detection module is specifically an LDO.

[0014] In a possible implementation, the visual card further includes a switch module.

[0015] The switch module is connected with the power supply module, the master control module and the display module. The switch module is configured to control the power supply module to supply power to the master control module and the display module.

[0016] In a possible implementation, the display module is specifically electronic paper.

[0017] The visual card provided by the embodiments of the present application effectively solves the problem of communication logic confusion between the security module and the master control module, which is caused by the fact that, when the visual card is powered on after entering the electromagnetic field, the non-taken power module obtains power from the electromagnetic field to supply power to the security module, so that the security module is already in a normal working state, and the security module cannot learn whether the master control module has completed initialization, that is, the security module cannot determine whether it can communicate with the master control module. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 A structural schematic diagram of a visual card provided for an embodiment of the present application;

[0020] Figure 2 Another structural schematic diagram of a visual card provided for an embodiment of the present application;

[0021] Figure 3 A circuit schematic diagram of a rectifier unit provided for an embodiment of the present application;

[0022] Figure 4 A circuit schematic diagram of a voltage stabilizing unit provided for an embodiment of the present application;

[0023] Figure 5 A connection schematic diagram of a first detection module and a security module provided for an embodiment of the present application;

[0024] Figure 6 A circuit schematic diagram of a second detection module provided for an embodiment of the present application;

[0025] Figure 7 Another structural schematic diagram of a visual card provided for an embodiment of the present application;

[0026] Figure 8 Another structural schematic diagram of a visual card provided for an embodiment of the present application;

[0027] Figure 9 Another structural schematic diagram of a visual card provided for an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0030] A dual-interface display card (DID) combines two power supply methods. In an electromagnetic field, it receives power through contactless connection. Once outside the electromagnetic field, it receives power from its built-in battery. These two power supply methods work together to ensure the card operates smoothly in various scenarios, improving its flexibility and reliability. They also minimize battery power consumption and extend its lifespan.

[0031] However, the two power supply methods mentioned above require the visual card to be powered on before entering the electromagnetic field. Once in the contactless field, it can draw power through the contactless method. If the visual card is powered on after entering the contactless field, the security chip will already be in the contactless field and can draw power directly from the field and operate normally. However, since the MCU has just started up, the security chip will not be able to monitor its operating status in a timely manner, which will cause communication logic between the MCU and the security chip to be disrupted.

[0032] Based on this, the embodiment of the present application provides a visual card, such as Figure 1 As shown, the video card 100 may include a contactless power module 101 , a security module 102 , a main control module 103 , a display module 104 , a first detection module 105 and a power module 106 .

[0033] The contactless power module 101 is connected to the security module 102. The first detection module 105 is connected to the security module 102 and the main control module 103. The security module 102 is connected to the main control module 103. The card device performs contactless communication and transmits key data acquired through contactless communication to the main control module 103. The main control module 103 is connected to the display module 104. The power module 106 is connected to the main control module 103 and the display module 104. The switch module is connected to the power module 106, the main control module 103, and the display module 104.

[0034] The contactless power module 101 is used to sense the electromagnetic field emitted by an external card reader device to obtain electrical energy and supply power to the security module 102 .

[0035] Exemplarily, after the visual card 100 is in contact with the external card reading device, the non-contact power taking module 101 can sense the electromagnetic field emitted by the external card reading device, can obtain power from the electromagnetic field emitted by the external card reading device in a non-contact power taking manner, and can supply power to the security module 102. In this process, the non-contact power taking module 101 can immediately obtain power when the visual card 100 is in contact with the electromagnetic field of the external card reading device, and can transmit the obtained power to the security module 102 to provide power for the security module 102.

[0036] A possible implementation manner is shown in Figure 2 The non-contact power taking module 101 includes an NFC coil 1011 and a power taking circuit 1012. The NFC coil 1011 is connected with the power taking circuit 1012. The NFC coil 1011 is used for inducing alternating current generated by the electromagnetic field emitted by the external card reading device, and is also used for non-contact communication with the external card reading device. The power taking circuit 1012 is connected with the security module 102. The power taking circuit 1012 is used for converting the alternating current generated by the NFC coil 1011 into direct current, and is used for delivering the direct current to the security module 102.

[0037] A possible implementation manner is that the power taking circuit 1012 includes a rectification unit 10121 and a voltage stabilizing unit 10122. The rectification unit 10121 is connected with the NFC coil 1011 and the voltage stabilizing unit 10122. The rectification unit 10121 is used for converting the alternating current generated by the NFC coil 1011 into direct current, and is used for delivering the direct current to the voltage stabilizing unit 10122. The rectification unit can be a rectification bridge circuit as shown in Figure 3 .

[0038] As shown in Figure 4 , Figure 4 a circuit schematic diagram of the voltage stabilizing unit, the voltage stabilizing unit 10122 is connected with the security module 102. The voltage stabilizing unit 10122 is used for stabilizing and filtering the direct current delivered by the rectification unit 10121 to obtain constant voltage, and is used for delivering the constant voltage to the security module 102, so that the security module 102 can work stably. In this embodiment, the voltage stabilizing unit 10122 is specifically a voltage stabilizing chip.

[0039] The first detection module 105 is used for detecting the enabling state of the master control module 103, and is used for sending a first detection signal to the security module 102 when it is detected that the master control module 103 is in the enabling state.

[0040] A possible implementation manner is that the first detection module 105 is specifically a detection resistor. As shown in Figure 5 , Figure 5Fig. 1 is a schematic diagram of a connection between the first detection module 105 and the security module 102. The first connection end of the detection resistor is connected with the security module 102 and the master control module 103, and the second connection end of the detection resistor is connected with the power module 106. In the case that the non-contact power module 101 supplies power to the security module 102 and the master control module 103 is not powered on, the first connection end of the detection resistor is set to high level, and the second connection end is at high level. After the master control module 103 is powered on and initialization is completed, the master control module 103 sets the first connection end of the detection resistor to low level. When the detection resistor detects that the first connection end changes from high level to low level, it is determined that the master control module 103 is in an enabled state, and a first detection signal is sent to the security module 102.

[0041] For example, in the case that the visual card accesses the electromagnetic field, at this time the security module 102 is powered by the non-contact power module 101, and the first connection end and the second connection end of the detection resistor are at high level. After the master control module 103 is powered on and initialization is completed, the master control module 103 sets the first connection end of the detection resistor to low level. When the detection resistor detects that the level of the first connection end changes from high level to low level, it is determined that the master control module 103 is in an enabled state, and a first detection signal is sent to the security module 102, so that the security module 102 can perceive that the master control module 103 has completed initialization at this time, and the security module 102 can communicate with the master control module 103, which can avoid the problem that the security module 102 and the master control module 103 cannot communicate due to the fact that the master control module 103 is just started and the security module 102 cannot obtain the enabled state of the master control module 103.

[0042] For example, the security module 102 in the embodiment is specifically a security chip, and the master control module 103 is specifically an MCU.

[0043] For example, in the case that the visual card is in the electromagnetic field, the master control module 103 is configured to, after being powered on and completing initialization, pull the level of the first connection end of the detection resistor to low, so that the first connection end of the detection resistor changes from high level to low level. The security module 102 is configured to, after perceiving that the master control module 103 is powered on and completes initialization through the first connection end of the detection resistor, send communication information to the master control module 103.

[0044] The security module 102 is configured to, when receiving the first detection signal sent by the first detection module 105, establish a communication connection with the master control module 103, and is further configured to send key data to the display module 104 through the non-contact power module 101 and the external reader, and control the display module 104 to display the key data.

[0045] The power module 106 is used to supply power to the master module 103 and the display module 104, and can supply power to the visual card 100 when the visual card 100 leaves the electromagnetic field of the external card reader.

[0046] In a possible implementation, the visual card further comprises a second detection module 107. As shown in Figure 6 Figure 6 FIG. 7 is a circuit diagram of the second detection module 107. As shown in Figure 7 The second detection module 107 is connected to the non-contact power module 101 and the security module 102. The second detection module 107 is used to send an entry signal to the master module 103 when the visual card enters the electromagnetic field, and send an exit signal to the master module 103 when the visual card leaves the electromagnetic field. In this embodiment, the second detection module 107 is specifically a detection chip.

[0047] For example, after the second detection module 107 sends the entry signal to the master module 103 when detecting that the visual card 100 enters the electromagnetic field, the master module 103 switches the power supply mode of the security module 102 to the non-contact power supply mode, and at this time, the security module 102 is mainly powered by the external non-contact magnetic field. In this process, the voltage of the non-contact power module 101 is stabilized by the voltage stabilizing unit 10122 and then transmitted to the security module 102, so that the security module 102 can receive a more stable voltage, and at the same time, since the signal passing through the second detection module 107 is the signal stabilized by the voltage stabilizing unit 10122, the detection result of the second detection module 107 can be more accurate. After the second detection module 107 sends the exit signal to the master module 103 when detecting that the visual card 100 leaves the electromagnetic field, the master module 103 switches the power supply mode of the security module 102 to the power supply mode of the master module 103, and at this time, the power module is called by the master module 103 to supply power to the security module 102 of the visual card.

[0048] In another possible implementation, as shown in Figure 7 The visual card further comprises a second detection module 107. The second detection module 107 is connected to the voltage stabilizing unit 10122 and the master module 103. The second detection module 107 is used to send an entry signal to the master module 103 when the visual card enters the electromagnetic field, and send an exit signal to the master module 103 when the visual card leaves the electromagnetic field.

[0049] For example, the second detection module 107 can be specifically a low dropout regulator (LDO).

[0050] In a possible implementation, as shown in Figure 8 ​As shown, the visual card can further include a switch module 108. The switch module is used to control the power supply module 106 to supply power to the master module 103 and the display module 104. The display module 104 can be an electronic paper in particular.

[0051] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application shall be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A viewable card, characterized by, The visual card comprises a non-contact power module, a security module, a master control module, a display module, a first detection module and a power module. The non-contact power module is connected with the security module, and is configured to induct an electromagnetic field emitted by an external card reading device to obtain power and supply power to the security module. The first detection module is connected with the security module and the master control module, and is configured to detect an enabling state of the master control module, and send a first detection signal to the security module when detecting that the master control module is in the enabling state. The security module is connected with the master control module, and is configured to, when receiving the first detection signal sent by the first detection module, establish a communication connection with the master control module, and perform non-contact communication with the external card reading device through the non-contact power module, and send key data obtained through the non-contact communication to the master control module. The master control module is connected with the display module, and is configured to send the key data to the display module and control the display module to display the key data. The power module is connected with the master control module and the display module, and is configured to supply power to the master control module and the display module.

2. The viewable card of claim 1, wherein, The non-contact power module comprises an NFC coil and a power taking circuit. The NFC coil is connected with the power taking circuit, and is configured to induct an alternating current generated by the electromagnetic field emitted by the external card reading device, and perform non-contact communication with the external card reading device. The power taking circuit is connected with the security module, and is configured to convert the alternating current generated by the NFC coil into direct current and supply the direct current to the security module.

3. The viewable card of claim 2, wherein, The power taking circuit comprises a rectification unit and a voltage stabilizing unit. The rectification unit is connected with the NFC coil and the voltage stabilizing unit, and is configured to convert the alternating current generated by the NFC coil into direct current and supply the direct current to the voltage stabilizing unit. The voltage stabilizing unit is connected with the security module, and is configured to stabilize and filter the direct current supplied by the rectification unit to obtain constant voltage and supply the constant voltage to the security module.

4. The viewable card of claim 1, wherein, The first detection module is specifically a detection resistor. A first connection end of the detection resistor is connected with the security module and the master control module, and a second connection end of the detection resistor is connected with the power module. In a case where the non-contact power module supplies power to the security module and the master control module is not powered on, the first connection end of the detection resistor is set to high level, and the second connection end is at high level. After the master control module is powered on and initialization is completed, the master control module sets the first connection end of the detection resistor to low level. When the detection resistor detects that the first connection end changes from high level to low level, it is determined that the master control module is in the enabling state, and the first detection signal is sent to the security module.

5. The viewable card of claim 4, wherein, In the case that the visual card is in the electromagnetic field, the main control module is used to pull the level of the first connection end of the detection resistor to low after power-on and initialization, so as to make the first connection end of the detection resistor from high level to low level; The security module is used to send communication information to the main control module through the first connection end of the detection resistor after the power-on of the main control module.

6. The viewable card of claim 1, wherein, The visual card further comprises a second detection module; The second detection module is connected with the non-contact power module and the security module; the second detection module is used to send an entry signal to the main control module in the case that the visual card enters the electromagnetic field, and send an exit signal to the main control module in the case that the visual card leaves the electromagnetic field.

7. The viewable card of claim 3, wherein, The visual card further comprises a second detection module; The second detection module is connected with the voltage stabilizing unit and the main control module; the second detection module is used to send an entry signal to the main control module in the case that the visual card enters the electromagnetic field, and send an exit signal to the main control module in the case that the visual card leaves the electromagnetic field.

8. The viewable card of claim 6 or 7, wherein, The second detection module is specifically an LDO.

9. The viewable card of claim 1, wherein, The visual card further comprises a switch module; The switch module is connected with the power module, the main control module and the display module; the switch module is used to control the power module to supply power to the main control module and the display module.

10. The viewable card of claim 1, wherein, The display module is specifically an electronic paper.

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