Passive visual card

Abstract

The utility model provides a passive visual card, which is applied to the technical field of intelligent cards, and in the passive visual card, a non-contact power taking module is connected with a power supply module, a safety module and a display module. And the non-connection electricity taking module is used for sensing an electromagnetic field emitted by external card reading equipment to obtain electric energy, charging a battery in the power supply module and supplying power to the safety module and the display module. The power module is connected with the display module. And the power supply module is used for supplying power to the display module when the passive visual card leaves the electromagnetic field. The first end of the switch module is connected with the safety module, the second end of the switch module is connected with the display module, and the third end of the switch module is connected with the power module. And the switch module is used for controlling the on or off of a path where the switch is located according to the level change condition of the first end. The safety module is connected with the display module. And the security module is used for controlling the display of the display module, so that the problem that after the passive visual card leaves the non-contact field, the operations such as display updating and data retention cannot be completed can be solved.

Description

Technical Field

[0001] This application relates to the field of smart card technology, and in particular to a passive visual card. Background Technology

[0002] Visual cards, as a new type of information display carrier, are widely used in fields such as identity recognition, payment, and access control. Based on their power supply method, visual cards are mainly divided into two categories: active visual cards and passive visual cards.

[0003] Traditional passive video cards are powered by an external electromagnetic field. However, when a passive video card leaves the non-disconnected field, its coils cannot draw power from the non-disconnected field, which may cause the passive video card to fail to refresh the screen, resulting in a poor user experience. Utility Model Content

[0004] The purpose of this application is to provide a passive visual card that solves the problem that the passive visual card cannot complete the screen-swiping operation after leaving the non-contact field, resulting in a poor user experience.

[0005] In a first aspect, embodiments of this application provide a passive visual card, which includes: a non-contact power module, a power module, a security module, a display module, and a switch module.

[0006] The contactless power module is connected to the power module, security module, and display module. The contactless power module senses the electromagnetic field emitted by the external card reader to obtain electrical energy, which charges the battery in the power module and supplies power to the security module and display module.

[0007] The power module is connected to the display module. The power module supplies power to the display module when the passive visual card is removed from the electromagnetic field.

[0008] The first terminal of the switch module is connected to the safety module, the second terminal is connected to the display module, and the third terminal is connected to the power module. The switch module controls the opening or closing of the circuit it connects to based on changes in the voltage level at the first terminal.

[0009] The security module is connected to the display module. The security module is used to control the display on the display module.

[0010] One possible implementation is that the switching module includes a field-effect transistor.

[0011] The gate of the field-effect transistor (FET) is connected to the first terminal of the switching module. The gate of the FET is used to control the FET to turn off when the passive visual card leaves the electromagnetic field.

[0012] The drain of the field-effect transistor is connected to the second and third terminals of the switching module. When the passive visual card leaves the electromagnetic field and the field-effect transistor is off, the second terminal remains at a high level, so that the power from the power module is delivered to the display module after passing through the third and second terminals in sequence.

[0013] The source of the field-effect transistor is connected to the low potential point of the passive visual card.

[0014] In one possible implementation, the switch module may also include pull-down resistors and / or pull-up resistors.

[0015] The pull-down resistor has its first terminal connected to the first terminal of the switching module and the MOSFET, and its second terminal connected to the drain of the passive visual card and the low-potential point of the passive visual card. The pull-down resistor is used to keep the first terminal of the switching module in a low-level state under normal conditions.

[0016] The first terminal of the pull-up resistor is connected to the third terminal of the switching module, and the second terminal of the pull-up resistor is connected to the source of the field-effect transistor and the second terminal of the switching module. The pull-up resistor is used to keep the normal state of the second terminal of the switching module high when the third terminal of the switching module is at a high level.

[0017] In one possible implementation, the security module includes a first communication interface and multiple second communication interfaces. The first communication interface of the security module is connected to the corresponding interface of the display module via a switch module. The multiple second communication interfaces of the security module are directly connected to the multiple corresponding interfaces of the display module via different communication lines.

[0018] One possible implementation involves connecting the display module to the feedback terminal of the power supply module. After completing the display, the display module sends a first signal to the feedback terminal of the power supply module to indicate that the display module is in an idle state; the power supply module then stops supplying power to the display module based on the first signal.

[0019] One possible implementation of the passive visual card also includes a first voltage regulator unit.

[0020] The first voltage regulator unit is connected to the contactless power supply module, the safety module, and the display module. The first voltage regulator unit is used to regulate and filter the DC power supplied by the contactless power supply module to obtain a first constant voltage, and then supply this first constant voltage to the safety module and the display module.

[0021] One possible implementation is that the passive visual card also includes a second voltage regulator unit.

[0022] The second voltage regulator unit is connected to the output terminal of the power supply module, the safety module, and the display module. The second voltage regulator unit is used to regulate and filter the DC power supplied from the output terminal of the power supply module to obtain a second constant voltage, which is then supplied to the safety module and the display module.

[0023] One possible implementation is that the second constant voltage is less than or equal to the first constant voltage, and / or the first voltage regulator is an LDO (Low Voltage Regulator). And / or the second voltage regulator is an LDO.

[0024] The first signal indicates the state, and the power module stops supplying power to the display module based on the first signal.

[0025] One possible implementation is that the contactless power module includes a coil and a contactless rectifier circuit.

[0026] The coil is connected to the contactless rectifier circuit. The coil is used to generate alternating current by sensing the electromagnetic field emitted by the external card reader, and also for contactless communication with the external card reader.

[0027] The contactless rectifier circuit is connected to the power module, safety module, and display module. It converts the alternating current (AC) generated by the coil into direct current (DC), supplying DC power to the power module, safety module, and display module.

[0028] One possible implementation is that the display module is specifically electronic paper. And / or the power module also includes a power management module connected to a battery, with the non-disconnected power module connected to the battery via the power management module, and the battery connected to the display module via the power management module.

[0029] The passive visual card provided in this application embodiment allows the first terminal of the switching module to control the opening or closing of the path where the switching module is located based on the change in the voltage level of the safety module after the passive visual card leaves the non-contact field. This causes the second terminal of the switching module connected to the display module to be in a high-level state, thereby controlling the power module to supply power to the display module. This allows the display module to perform screen refresh operations even when the passive visual card leaves the electromagnetic field, improving the user experience. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 A schematic diagram of a passive visual card provided in an embodiment of this application;

[0032] Figure 2 A schematic diagram of a switching module for a passive visual card provided in an embodiment of this application;

[0033] Figure 3This is another structural schematic diagram of a passive visual card provided in an embodiment of this application;

[0034] Figure 4 This is another structural schematic diagram of a passive visual card provided in an embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] This application provides a passive visual card, such as... Figure 1 As shown, the passive visual card 100 may include a non-contact power module 101, a power module 102, a security module 103, a display module 104, and a switch module 105.

[0038] The non-contact power module 101 is connected to the power module 102, the safety module 103, and the display module 104.

[0039] The contactless power module 101 is used to sense the electromagnetic field emitted by the external card reader to obtain electrical energy, charge the battery in the power module 102, and supply power to the security module 103 and the display module 104.

[0040] Specifically, when the passive visual card is connected to an external card reader, the contactless power module 101 obtains electrical energy by sensing the electromagnetic field emitted by the external card reader, and then charges the battery in the power module 102 and supplies power to the security module 103 and the display module 104.

[0041] When the passive visual card leaves the external card reader, the non-contact power module 101 leaves the electromagnetic field of the external card reader, stops charging the battery in the power module 102, and stops supplying power to the security module 103 and the display module 104.

[0042] One possible implementation is that the contactless power module 101 includes a coil 1011 and a contactless rectifier circuit 1012.

[0043] The coil 1011 is connected to the contactless rectifier circuit 1012. The coil 1011 is used to generate alternating current by sensing the electromagnetic field emitted by the external card reader, and is also used for contactless communication with the external card reader.

[0044] For example, coil 1011 can be an NFC coil.

[0045] The contactless rectifier circuit 1012 is connected to the power module 102, the safety module 103, and the display module 104. The contactless rectifier circuit 1012 is used to convert the alternating current generated by the coil 1011 into direct current and supply direct current to the power module 102, the safety module 103, and the display module 104.

[0046] The power module 102 is connected to the display module 104. The power module 102 is used to supply power to the display module 104 when the passive visual card leaves the electromagnetic field.

[0047] Specifically, when the passive visual card leaves the external card reader, the non-contact power module 101 leaves the electromagnetic field of the external card reader and stops charging the power module 102. Then, the power module 102 starts supplying power to the display module 104.

[0048] The first terminal of the switch module 105 is connected to the safety module 103, the second terminal of the switch module 105 is connected to the display module 104, and the third terminal of the switch module 105 is connected to the power supply module 102. The switch module 105 is used to control the opening or closing of the circuit where the switch is located according to the change in the level of the first terminal.

[0049] One possible implementation is that the switching module 105 includes a field-effect transistor 1051.

[0050] like Figure 2 As shown, the gate 10511 of the field-effect transistor 1051 is connected to the first terminal of the switching module 105. The gate 10511 of the field-effect transistor 1051 is used to control the field-effect transistor 1051 to turn off when the passive visual card leaves the electromagnetic field.

[0051] The drain 10512 of the field-effect transistor 1051 is connected to the second and third terminals of the switching module 105. When the passive visual card 100 leaves the electromagnetic field and the field-effect transistor 1051 is off, the second terminal of the switching module 105 remains at a high level so that the power of the power supply module 102 is delivered to the display module 104 after passing through the third and second terminals in sequence.

[0052] The source 10513 of the field-effect transistor 1051 is connected to the low potential point of the passive visual card.

[0053] For example, when the passive visual card leaves the electromagnetic field of the external card reader, the first terminals of the security module 103 and the switch module 105 are at a low level, the gate of the field-effect transistor 1051 is pulled low, and the field-effect transistor 1051 is in a cutoff state. At this time, the path containing the second and third terminals of the switch module 105 is connected, and the power supply module 102 supplies power to the display module 104 through the second and third terminals of the switch module 105. This ensures that the display module 104 is at a high level, thereby ensuring that the display module 104 can still refresh the screen normally after the passive visual card leaves the electromagnetic field of the external card reader.

[0054] In one possible implementation, the switch module 105 may also include a pull-down resistor 1052 and / or a pull-up resistor 1053.

[0055] like Figure 2 As shown, the first terminal of pull-down resistor 1052 is connected to the first terminal of switch module 105 and field-effect transistor 1051, and the second terminal of pull-down resistor 1052 is connected to the drain 10512 of passive visual card and the low potential point of passive visual card. Pull-down resistor 1052 is used to keep the first terminal of switch module 105 in a low-level state under normal conditions.

[0056] The first terminal of pull-up resistor 1053 is connected to the third terminal of switch module 105, and the second terminal of pull-up resistor 1053 is connected to the source 10513 of field-effect transistor 1051 and the second terminal of switch module 105. Pull-up resistor 1053 is used to ensure that the second terminal of switch module 105 is normally in a high-level state when display module 104 is in normal display state, at which time the third terminal of switch module 105 is at a high level.

[0057] The safety module 103 is connected to the display module 104. The safety module 103 is used to control the display of the display module 104.

[0058] In one possible implementation, the security module 103 includes a first communication interface and multiple second communication interfaces. The first communication interface of the security module 103 is connected to the corresponding interface of the display module 104 via a switch module 105. The multiple second communication interfaces of the security module 103 are directly connected to the multiple corresponding interfaces of the display module 104 via different communication lines. For example, the first communication interface and the multiple second communication interfaces in the security module 103 can be connected to the corresponding interfaces of the display module 104 via SPI lines.

[0059] Furthermore, after the safety module 103 controls the display module 104 to display, the display module 104 can directly control the power module 102 to stop supplying power to the safety module 103 and the display module 104, or the safety module 103 can control the power module 102 to stop supplying power to the safety module 103 and the display module 104.

[0060] In one possible implementation, the display module 104 is connected to the feedback terminal of the power module 102. After completing the display, the display module 104 sends a first signal to the feedback terminal of the power module 102, indicating that the display module is in an idle state. Upon receiving the first signal, the power module 102 stops supplying power to the display module 104.

[0061] In another possible implementation, the safety module 103 is connected to the feedback terminal of the power module 102. The safety module 103 is used to send a second signal to the feedback terminal of the power module 102 after the display module 104 has finished displaying. The second signal is used to indicate that the display module is in an idle state, and the power module 102 stops supplying power to the display module 104 after receiving the second signal.

[0062] One possible implementation is that the display module 104 is specifically an electronic paper.

[0063] One possible implementation is, such as Figure 3 As shown, the power module 102 also includes a power management module 1022 connected to the battery 1021. The contactless power module is connected to the battery 1021 through the power module, and the battery 1021 is connected to the display module through the power management module 1022.

[0064] In one possible implementation, the passive visual card also includes a first voltage regulator unit 106.

[0065] like Figure 3 As shown, the first voltage regulator unit 106 is connected to the contactless power supply module 101, the safety module 103, and the display module 104. The first voltage regulator unit 106 is used to regulate and filter the DC power supplied by the contactless power supply module 101 to obtain a first constant voltage, and then supply the first constant voltage to the safety module 103 and the display module 104.

[0066] One possible implementation is that the first voltage regulator unit 106 is an LDO.

[0067] In one possible implementation, the passive visual card also includes a second voltage regulator unit 107.

[0068] The second voltage regulator unit 107 is connected to the output terminal of the power module 102, the safety module 103, and the display module 104. The second voltage regulator unit 107 is used to regulate and filter the DC power supplied from the output terminal of the power module to obtain a second constant voltage, and then supply the second constant voltage to the safety module 103 and the display module 104.

[0069] One possible implementation is that the second voltage regulator unit 107 is an LDO.

[0070] Wherein, the second constant voltage is less than or equal to the second constant voltage.

[0071] It should be noted that the first constant voltage of the first voltage regulator unit 106 in the first power supply branch and the second constant voltage of the second voltage regulator unit 107 in the second power supply branch can be the same or different, and this application does not limit this. For example, both the first constant voltage and the second constant voltage can be 3.3V, or the first constant voltage can be 3.3V and the second constant voltage can be 3.0V.

[0072] Furthermore, such as Figure 4 As shown, a switching circuit 108 can be set between the first power supply branch, the second power supply branch and the display module 104 to switch the power supply branch to supply power to the display module 104 according to the state of the electromagnetic field when the passive visual card enters or leaves the external card reader.

[0073] The passive visual card provided in this application embodiment allows the first terminal of the switching module to control the opening or closing of the path where the switching module is located based on the change in the voltage level of the safety module after the passive visual card leaves the non-contact field. This keeps the second terminal of the switching module connected to the display module in a high-level state, thereby controlling the power module to supply power to the display module. Even when the passive visual card leaves the electromagnetic field, controlling the power module to supply power to the display module keeps the display module in a high-level state, enabling screen refresh operations and improving the user experience.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A passive visual card, characterized in that, The passive visual card includes: a non-contact power module, a power module, a security module, a display module, and a switch module; The contactless power module is connected to the power module, the security module, and the display module; the contactless power module is used to sense the electromagnetic field emitted by the external card reader to obtain electrical energy, charge the battery in the power module, and supply power to the security module and the display module; The power module is connected to the display module; the power module is used to supply power to the display module when the passive visual card leaves the electromagnetic field; The first terminal of the switch module is connected to the safety module, the second terminal of the switch module is connected to the display module, and the third terminal of the switch module is connected to the power module; the switch module is used to control the circuit where the switch is located to open or close according to the change in the level of the first terminal. The security module is connected to the display module; the security module is used to control the display of the display module.

2. The passive visual card according to claim 1, characterized in that, The switching module includes a field-effect transistor; The gate of the field-effect transistor is connected to the first terminal of the switching module; the gate of the field-effect transistor is used to control the field-effect transistor to turn off when the passive visual card leaves the electromagnetic field; The drain of the field-effect transistor is connected to the second and third terminals of the switching module; when the passive visual card leaves the electromagnetic field and the field-effect transistor is in the off state, the second terminal remains at a high level so that the power of the power module is delivered to the display module after passing through the third terminal and the second terminal in sequence. The source of the field-effect transistor is connected to the low potential point of the passive visual card.

3. The passive visual card according to claim 2, characterized in that, The switching module further includes a pull-down resistor and / or a pull-up resistor; The first end of the pull-down resistor is connected to the first end of the switching module and the field-effect transistor, and the second end of the pull-down resistor is connected to the drain of the passive visual card and the low potential point of the passive visual card; the pull-down resistor is used to keep the normal state of the first end of the switching module low. The first end of the pull-up resistor is connected to the third end of the switching module, and the second end of the pull-up resistor is connected to the source of the field-effect transistor and the second end of the switching module; the pull-up resistor is used to keep the normal state of the second end of the switching module high when the third end of the switching module is at a high level.

4. The passive visual card according to claim 1, characterized in that, The security module includes a first communication interface and multiple second communication interfaces; The first communication interface of the security module is connected to the corresponding interface of the display module through the switch module; The multiple second communication interfaces of the security module are directly connected to multiple corresponding interfaces of the display module via different communication lines.

5. The passive visual card according to claim 1, characterized in that, The display module is connected to the feedback terminal of the power module; after completing the display, the display module sends a first signal to the feedback terminal of the power module to indicate that the display module is in an idle state, and the power module stops supplying power to the display module according to the first signal.

6. The passive visual card according to any one of claims 1 to 5, characterized in that, The passive visual card also includes a first voltage regulator unit; The first voltage regulator unit is connected to the contactless power supply module, the safety module, and the display module; the first voltage regulator unit is used to regulate and filter the DC power supplied by the contactless power supply module to obtain a first constant voltage, and supply the first constant voltage to the safety module and the display module.

7. The passive visual card according to claim 6, characterized in that, The passive visual card also includes a second voltage regulator unit; The second voltage regulator unit is connected to the output terminal of the power supply module and the display module; the second voltage regulator unit is used to regulate and filter the DC power supplied by the power supply module from the output terminal to obtain a second constant voltage, and supply the second constant voltage to the display module.

8. The passive visual card according to claim 7, characterized in that, The second constant voltage is less than or equal to the first constant voltage; and / or The first voltage regulator unit is an LDO; and / or The second voltage regulator unit is an LDO.

9. The passive visual card according to any one of claims 1 to 5, characterized in that, The non-contact power module includes a coil and a non-contact rectifier circuit; The coil is connected to the contactless rectifier circuit; the coil is used to sense the electromagnetic field emitted by the external card reader to generate alternating current, and is also used to perform contactless communication with the external card reader. The non-contact rectifier circuit is connected to the power module, the safety module, and the display module; the non-contact rectifier circuit is used to convert the AC power generated by the coil into DC power and supply the DC power to the power module, the safety module, and the display module.

10. The passive visual card according to any one of claims 1-5, characterized in that, The display module is an electronic paper; and / or The power module further includes a power management module connected to the battery. The non-contact power module is connected to the battery through the power management module, and the battery is connected to the display module through the power management module.

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