JP5998664B2 - Non-contact communication medium - Google Patents

Description

  The present invention relates to a non-contact communication medium that communicates with the outside by non-contact.

  Conventionally, there is a card type one-time password generator as an IC card with a display. For example, in the IC card of Patent Document 1, power is supplied from an internal power supply (battery) to drive the display unit. In such a card with a display function using a battery, it is naturally impossible to rewrite the display when the battery capacity is exhausted.

  On the other hand, there is also known an IC card with a display function capable of performing display without using an internal power source by using an output electromagnetic wave of a reader / writer device in non-contact communication as electric power (Patent Document 2). In such a card with a display function, the stored contents can be displayed without a battery. However, when the card is separated from the reader / writer device serving as a power source, the display cannot be rewritten.

JP 2010-257422 A Japanese Patent No. 4854914

  Accordingly, an object of the present invention is to allow the content display to be rewritten even when the reader / writer device is separated from the reader / writer device by the built-in power source. An object of the present invention is to provide an IC card that can efficiently drive a display unit by rewriting.

In order to solve the above problems, in one aspect of the present invention, the first interface and the second interface that mutually input and output data are mutually exclusive, the storage unit that stores data, and the first interface An IC chip having an arithmetic processing unit that processes data and outputs the processed data to the storage unit, a non-contact communication antenna that receives at least the data in a non-contact manner and sends the received data to the first interface, and is transmitted When it is possible to input / output data to / from the arithmetic processing unit via the second interface, the display unit that is driven by the received power and the transmitted power is stored in the storage unit. The data is acquired, and the control unit that controls the display content of the display unit based on the acquired data is powered by non-contact, An electric power transmission antenna for transmitting the electric power to the display unit and the control unit, a built-in power source capable of feeding power to the control unit, a state where power can be fed from the built-in power source to the control unit, and power feeding is cut off A second switching unit that switches permission and restriction of transmission of data from the non-contact communication antenna to the first interface. The switching unit restricts the data transmission permission state when a preset condition is satisfied, and the second switching unit presses the physical switch, and the display content is displayed each time the second switching is turned on. The non-contact communication medium is characterized in that the display content is switched with reference to the information indicating .

In one aspect of the present invention, the control unit determines whether power is supplied in a non-contact manner, and means for cutting off power supply from the built-in power source in a state where power can be supplied from the built-in power source to the control unit. The contactless communication medium according to claim 1 is preferable.
In the aspect of the invention, the arithmetic processing unit performs a predetermined arithmetic processing on the data input from the first interface and outputs the data to the storage unit, and the control unit includes the storage unit The non-contact communication medium according to claim 1 or 2, wherein the arithmetic processing unit acquired from (1) controls the display content of the display unit based on the data subjected to the arithmetic processing.
In one embodiment of the present invention, the display unit retains display content when transmission of the power is stopped. 4. The non-contact communication medium according to claim 1, Is preferred.
In one embodiment of the present invention, the contactless communication medium according to any one of claims 1 to 4 , wherein the contactless communication antenna also serves as the power transmission antenna.
In the aspect of the invention, the control unit supplies power to the second interface when the second switching unit restricts the permission state of the data transmission, and causes the second interface to transmit data. The contactless communication medium according to any one of claims 1 to 5, wherein input / output is enabled.

  According to the present invention, the state in which the transmission of data from the non-contact communication antenna to the first interface is permitted is restricted by the switching unit, so that the transmission is permitted via the first interface during the period in which the transmission is permitted. The display content of the display unit driven by the power from the power transmission antenna can be controlled based on the data input and stored in the storage unit. Thus, according to the present invention, the display unit can be driven without a battery only by the power supplied from the reader / writer, and the display content of the display unit can be controlled based on the data from the reader / writer. Further, when the reader / writer is away from the reader / writer, the display content can be controlled by switching to the built-in power source, so that the display unit of the IC card can be driven efficiently.

It is a block diagram which shows the structural example of the IC card of this embodiment. It is a figure which shows an example of an external appearance structure of the IC card of this embodiment. It is a flowchart which shows an example of a series of operation | movement on the reader / writer in an IC card. It is a flowchart which shows an example of a series of operation | movement in the state away from the reader / writer in an IC card. It is a block diagram which shows the structural example of the IC card of the modification of this embodiment. It is a block diagram which shows the other structural example of the IC card of the modification of this embodiment. It is a block diagram which shows the other structural example of the IC card of the modification of this embodiment.

Embodiments of the present invention will be described with reference to the drawings.
In this embodiment, an IC card is cited as an example of a non-contact communication medium. FIG. 1 is a block diagram illustrating a configuration example of an IC card 1 according to the present embodiment.
As shown in FIG. 1, an IC card 1 includes a non-contact communication antenna 2, a power supply antenna 3, a rectifier circuit 4, a display unit 5, a first switch 7, a control microcomputer 10, an IC chip 20, and a built-in power source. 26 and a second switch 27.

  The non-contact communication antenna 2 is an antenna that performs non-contact communication with an external reader / writer. The non-contact communication antenna 2 receives an electromagnetic wave emitted from an external reader / writer, converts it into energy, supplies power to the IC chip 20 side, and generates a current generated by non-contact wireless communication with the external reader / writer. (Current in which data is modulated) is output to the IC chip 20 side. For example, the non-contact communication antenna 2 is a wound antenna, an etching antenna, or a printed antenna. The contactless communication antenna 2 is intermittently connected to the contactless interface 21 of the IC chip 20 when the switch 7 is turned on and off.

The power supply antenna 3 is an antenna that receives an electromagnetic wave emitted from an external reader / writer, converts it into energy, and supplies power to the control microcomputer 10, the display unit 5, and the IC chip 20. The power supply antenna 3 is electrically connected to the rectifier circuit 4.
The rectifier circuit 4 rectifies the high frequency signal from the power supply antenna 3 and supplies a direct current (electric power) to the control microcomputer 10.

  The control microcomputer 10 performs various processes on the IC card 1. The control microcomputer 10 operates with electric power supplied (transmitted) from the rectifier circuit 4. Further, the control microcomputer 10 can be electrically connected to the contact interface 22 of the IC chip 20. When the control microcomputer 10 is electrically connected to the contact interface 22, the control microcomputer 10 exchanges data with the non-contact OS 23 via the contact interface 22. Further, power is supplied from the control microcomputer to the IC chip 22 through the contact interface 22. Further, the control microcomputer 10 has a display control unit 11 for controlling the display contents of the display unit 5.

  The display control unit 11 drives the display unit 5 by applying a voltage to the display unit 5 with the electric power supplied from the rectifier circuit 4. The display control unit 11 controls the display content of the driven display unit 5 based on data stored in the memory 25 of the IC chip 20 acquired via the contact interface 22 as described later.

  The display unit 5 displays various information. The display unit 5 is connected to the I / O terminal 12 of the control microcomputer 10 and is driven by electric power (voltage application) supplied from the control microcomputer 10. The display unit 5 is configured by a non-volatile display device, and can retain display contents even when power supply is stopped. For example, the display unit 5 includes an electrophoretic method, an electronic paper such as a ferroelectric liquid crystal or a cholesteric liquid crystal, an electrochromic liquid crystal, or the like. On the other hand, a display device such as a liquid crystal display or an organic EL display may be used as long as the display is performed only while power is supplied.

  The first switch 7 is switched ON and OFF by a physical switch 6 such as a push button. The first switch 7 is connected to the control microcomputer 10, and ON / OFF information is sent from the switch 7 to the control microcomputer 10.

  The first switch 7 has a function of switching an electrical connection state with the non-contact interface 21 of the IC chip 20 by ON / OFF switching. In this embodiment, the non-contact communication antenna 2 and the non-contact interface 21 of the IC chip 20 are connected to each other by input / output terminals, so that the switch 7 is arranged as a short-circuit switch between the input / output terminals. Yes. As a result, the switch 7 is turned off when the push button 6 is not pressed, and the non-contact communication antenna 2 and the non-contact interface 21 of the IC chip 20 are electrically connected without short-circuiting the input / output terminals. To do. As a result, data can be exchanged between the contactless communication antenna 2 and the contactless OS of the IC chip 20 via the contactless interface 21. On the other hand, the switch 7 is turned on when the push button 6 is pressed, and the input / output terminals are short-circuited to disconnect the electrical connection state between the non-contact communication antenna 2 and the non-contact interface 21 of the IC chip 20. .

  The built-in power supply 26 supplies power to the control microcomputer 10, the display unit 5, and the IC chip 20. For the built-in power supply 26, various rechargeable secondary batteries such as a primary battery and a lithium ion battery, a capacitor, a solar battery, and the like can be used. When using the rechargeable built-in power supply 26, the power supply antenna 3 and the built-in power supply 26 are connected via a rectifier circuit so that surplus power can be charged to the built-in power supply 26 when contacting the external reader / writer. May be.

  The second switch 27 can switch the power supply state from the built-in power supply 26. In the present embodiment, the second switch 27 is connected to a physical switch 28 different from the first switch 7. When the second switch 27 is turned on by the physical switch, the second switch 27 is energized and controlled from the built-in power supply 26. It is possible to supply power to the microcomputer 10.

  The IC chip 20 has two interfaces. For example, the IC chip 20 is a so-called dual chip mounted on an IC card that enables communication with the outside by non-contact or contact, that is, a so-called dual interface card. The dual chip is an IC chip configured to be able to access one memory through two interfaces. The dual interface card may also be referred to as a composite IC card or a combination IC card.

The IC chip 20 which is such a dual chip has a non-contact interface 21, a contact interface 22, a non-contact OS 23, a contact OS 24, and a memory 25.
As described above, the non-contact interface 21 is switched between the state of electrical connection and disconnection with the non-contact communication antenna 2 by switching the first switch 7 on and off.

  The contact interface 22 is connected to the I / O terminal 26 of the IC chip 20, and the control microcomputer 10 is connected via the I / O terminal 26. As will be described later, since the contact interface 22 is used to output data for display control of the display unit 5 to the control microcomputer 10, it can also be said to be a display data output interface.

  The IC chip 20 has a connection state between the contact interface 22 and the outside (non-contact communication antenna 2 in this embodiment), and a connection state between the non-contact interface 21 and the outside (control microcomputer 10 in the present embodiment). Are controlled exclusively or asynchronously. Alternatively, the IC chip 20 controls the non-contact interface 21 and the contact interface 22 so that data input / output is mutually exclusive. Thereby, the contact interface 22 is controlled when the non-contact interface 21 and the non-contact communication antenna 2 are electrically connected, that is, when the non-contact interface 21 inputs and outputs data. Electrical connection with the microcomputer 10 is prohibited, that is, input / output of data of the contact interface 22 is prohibited. On the other hand, the contact interface 22 permits electrical connection with the control microcomputer 10 when the contactless interface 21 and the contactless communication antenna 2 are not electrically connected. Allow data input and output.

  In general, dual interface cards include a method that prioritizes contact communication and a method that prioritizes the first communication (entered priority method). The method of giving priority to contact communication is a method of invalidating communication of the non-contact interface when the contact interface starts communication with the outside even when the non-contact interface is communicating with the outside. In addition, the method that gives priority to the one that performs communication first is a method that maintains the communication state of the data of the interface that started communication first among the non-contact interface and the contact interface. In the present embodiment, the IC card 1 employs the latter method in which the first connection is prioritized. Thus, for example, when the non-contact interface first starts communication, specifically, when power is supplied, communication of the non-contact interface is maintained unless the non-contact interface ends communication. That is, in the present embodiment, the exclusive control described above is always prioritized, and the connection state or data input / output state of the non-contact interface 21 and the contact interface 22 is controlled.

  Here, in this embodiment, at the timing when the IC card 1 is held over the reader / writer, the non-contact communication antenna 2 starts to supply power to the non-contact interface 21, and the power supply antenna 3 is a rectifier circuit. 4, supply of power to the control microcomputer 10 is started. As a result, power is supplied to the contact interface 22 via the control microcomputer 10. In this embodiment, under such a situation, the non-contact interface 21 starts communication first (becomes electrically connected to the non-contact communication antenna 2). For example, this is because the power supply timing to the contact interface 22 is the power supply to the non-contact interface 21 due to the structural reason that the control microcomputer 10 is interposed between the power securing antenna 3 and the contact interface 22. This is because it is later than the timing. In another configuration, when the first switch 7 is in an OFF state, power is not supplied from the control microcomputer 10 to the contact interface 22, and the contact from the control microcomputer 10 is not made until the first switch 7 is in the ON state. Power is supplied to the interface 22.

  As described above, in the present embodiment, the contactless communication antenna 2 and the contactless interface 21 are first electrically connected at the timing when the IC card 1 is held over the reader / writer (the contactless interface 21 is the data). When the electrical connection between the non-contact communication antenna 2 and the non-contact interface 21 is disconnected by the switch 7, the contact interface 22 and the control microcomputer 10 are electrically connected. The

  The non-contact OS 23 performs control and arithmetic processing based on data output from the non-contact interface 21. Specifically, the non-contact OS 23 processes data output from the non-contact interface 21 (data modulated into current) and writes it in the memory 25. Here, the memory 25 is, for example, a RAM, a ROM, an EEPROM, or the like.

  Further, the non-contact OS 23 performs predetermined arithmetic processing (arithmetic processing such as addition and subtraction) on the data stored in the memory 25, and writes the data subjected to the arithmetic processing in the memory 25. For example, when the contactless OS 23 acquires deposit / withdrawal data from the output of the contactless interface 21, the balance data stored in the memory 25 is added / subtracted to the final balance data using the acquired deposit / withdrawal data. Is calculated.

  Further, the non-contact OS 23 outputs the data stored in the memory 25 to the control microcomputer 10 via the contact interface 22 by the cross-access function when the contact interface 22 and the control microcomputer 10 are electrically connected. Yes (sweep out).

  Here, the cross-access function is a function that enables access from the non-contact interface 21 to the contact OS 24 and further enables access from the contact interface 22 to the non-contact OS 23.

  In this embodiment, on the premise of this cross access function, the control microcomputer 10 outputs an instruction command for inducing cross access to the non-contact OS 23 to the contact interface 22 at a preset time interval (for example, 500 ms). For this reason, when the electrical connection state between the non-contact interface 21 and the non-contact communication antenna 2 is cut and the contact interface 22 and the control microcomputer 10 are electrically connected by exclusive control. The contact interface 22 electrically connects the non-contact OS 23 and the control microcomputer 10 at the timing when the instruction command from the control microcomputer 10 is input.

  Therefore, in a state where the non-contact interface 21 is electrically connected to the outside, the non-contact OS 23 executes processing such as writing data to the memory 25, and even when the contact interface 22 is electrically connected to the outside, The non-contact OS 23 executes processing. Therefore, in the present embodiment, the contact OS 24 does not actually execute processing such as writing data in the memory 25. That is, the contact OS 24 has a function of performing control and arithmetic processing based on the current output from the contact interface 22 as a function similar to that of the non-contact OS 23. In the present embodiment, such a process is performed. And so on.

  FIG. 2 is a diagram illustrating an example of an external configuration of the IC card 1 of the present embodiment. The IC card 1 has a thin card shape, the display surface of the display unit 5 is exposed to the outside, and physical switches 6 and 28 are disposed on the surface so as to be pressed. When the non-volatile display device is used for the push buttons 6 and 28, the switches 6 and 28 are turned on only while being pressed. In the case of using a volatile display device, the switches 6 and 28 may be turned on only while being pressed, or the switches 6 and 28 are turned on and off with each press. May be.

(Operation, action, etc.)
Next, the operation of the IC card 1 and its action will be described with reference to FIGS.
FIG. 3 is a flowchart showing a series of operations in the IC card 1 when held over the reader / writer.
When the IC card 1 is held over the reader / writer, the non-contact communication antenna 2 starts non-contact wireless communication with the reader / writer (step S1). As a result, in the IC card 1, data from the non-contact communication antenna 2 is input into the IC chip 20 via the non-contact interface 21 and stored in the memory 25. In the IC card 1, the power supplied from the reader / writer to the power securing antenna 3 is input to the control microcomputer 10 simultaneously with the start of the non-contact wireless communication. As a result, the non-contact communication antenna 2 starts non-contact wireless communication with the reader / writer, and at the same time, the control microcomputer 10 is activated (step S2). Then, the control microcomputer 10 starts outputting an instruction command for inducing cross access to the non-contact OS 23 to the contact interface 22. At this time, the control microcomputer 10 outputs an instruction command at a preset time interval (for example, 500 ms).

  In the IC card 1, when the push button 6 is pressed and the switch 7 is turned on, the electrical connection state between the non-contact communication antenna 2 and the non-contact interface 21 is cut off. By the connection control, the contact interface 22 and the control microcomputer 10 are electrically connected (step S3, step S4). As a result, in the IC card 1, the contact interface 22 is applied by the control microcomputer 10. As a result, since the instruction command for the contact interface 22 becomes valid, the control microcomputer 10 can access the memory 25 via the contact interface 22 by cross access (step S5). As a result, the control microcomputer 10 can control the display of the display unit 5 based on the data stored in the memory 25 (step S6).

  Further, even when the pressing operation on the pressing button 6 is released and the switch 7 is turned off, such display control of the display unit 5 by the control microcomputer 10 is maintained. This is because, under the above-described exclusive control in the IC chip 20, even if the non-contact communication antenna 2 and the non-contact interface 21 are electrically connected by turning off the switch 7, the electrical connection is effective. This is because the electrical connection between the contact interface 22 and the control microcomputer 10 is maintained (that is, data input / output of the contact interface 22 is validated and maintained).

  Here, in the above-described embodiment, the non-contact interface 21 configures a first interface, for example. Moreover, the contact interface 22 comprises a 2nd interface, for example. Further, the non-contact OS 23 constitutes an arithmetic processing unit, for example. Further, the push button 6 and the switch 7 constitute, for example, a switching unit. Here, the switching unit switches between permission and restriction (including prohibition) of data transmission from the non-contact communication antenna to the first interface. The power securing antenna 3 constitutes, for example, a power transmission antenna. Moreover, the control microcomputer 10 or the display control part 11 comprises a control part, for example.

FIG. 4 is a flowchart showing a series of operations in the IC card 1 in a state away from the reader / writer.
Since the power is not supplied from the outside in a state away from the reader / writer, the control microcomputer is stopped. When the switch 27 is turned on by the physical switch 28, the built-in power supply 26 and the control microcomputer 10 are connected, power is supplied to the control microcomputer, and the control microcomputer is activated (step S11, step S12). By applying the control microcomputer 10 to the contact interface 22, it becomes possible to access the memory via the contact interface (steps S5 and S6). The control microcomputer 10 can display the data content on the display unit by transmitting a display control command to the display unit and outputting the data read from the memory 25 to the display unit (step S15).

  The connection between the built-in power supply 26 and the control microcomputer 10 is disconnected after a display control command is transmitted from the control microcomputer 10 to the display unit. As shown in FIG. 4, the cutting is performed by controlling the switch at a predetermined time such as 500 ms or 1000 ms after the control microcomputer starts up or detects the non-contact carrier, or mechanically using a capacitor or the like. The power supply is stopped at a predetermined time.

  In the state where the IC card 1 is on the reader / writer, even when the switch 27 is turned on by the physical switch 28, the power may be supplied from the power securing antenna 3 without being supplied from the built-in power supply 26. When power is supplied to the control microcomputer 10 from the power securing antenna 3 when the switch 27 is turned on, the control microcomputer 10 cuts off the power supply of the built-in power supply 26 and supplies power from the power securing antenna 3. To display. Specifically, when the generated electromotive force of the power securing antenna 3 is detected by a voltage detector and the generated electromotive force has a constant electromotive force (e.g., equivalent to the electromotive force of the internal power source), the internal power source It is determined that power supply by is unnecessary.

The display content when the physical switch 6 or the physical switch 28 is pressed in a state where the IC card 1 is on the reader / writer may be changed according to the pressed physical switch. For example, as described later, the switch 7 ON signal can be transmitted as an input signal of the control microcomputer 10 so that the physical switch 6 is pressed or the electromotive force of the built-in power supply 26 is detected by a voltage detector. 28 is checked.
(Effect in this embodiment)

The non-contact OS 23 performs preset arithmetic processing on the data input from the non-contact interface 21 and stores the data in the memory 25. And the control microcomputer 10 controls the display content of the display part 5 based on the data which non-contact OS23 acquired from the memory 25 performed the arithmetic processing.
Thereby, in this embodiment, the display content of the display unit 5 can be controlled based on the data calculated by the non-contact OS 23.
In addition, the push button 6 and the switch 7 perform switching of permission / prohibition of data input / output in accordance with an external operation.

  Thereby, in this embodiment, it can display on the display part 5 at the timing which a user intends by operation by a user. Therefore, in this embodiment, the user can display information such as a balance on the display unit 5 of the IC card 1 by holding the IC card 1 over the reader / writer and then pressing the pressing button 6.

  In addition, by providing a built-in power supply, it is possible to switch display contents even when there is no external power supply. On the other hand, when displaying on the reader / writer, since the display is performed with the power supplied from the power supply antenna, the display unit can be operated efficiently using the power source.

  In the present embodiment, a dual chip can be used as the IC chip 20. Therefore, in this embodiment, the IC card 1 can be provided at a reduced cost.

The dual chip is a secure chip that realizes high security such as FeliCa. Therefore, the IC card 1 of the present embodiment can realize a high level of security by using a dual chip as the IC chip 20.
(Modification of this embodiment)

In the present embodiment, a dual chip is cited as an example of the IC chip 20. However, the IC chip 20 is not limited to a dual chip, and has two interfaces, one being a non-contact interface 21 and the other being an interface whose operation is controlled exclusively with the non-contact interface 21. It should be. Further, the arithmetic processing unit 23 is not limited to the configuration including the contact OS and the non-contact OS, and it is sufficient that the non-contact communication can be performed from the non-contact interface and the memory can be accessed from both the non-contact interface and the other interface.
In the present embodiment, the non-contact communication antenna 2 and the power supply antenna 3 may be configured integrally.
FIG. 5 is a diagram illustrating an example of the configuration in which the non-contact communication antenna 2 serves also as a power supply antenna.

  As shown in FIG. 5, the non-contact communication antenna 2 is connected to the non-contact interface 21 and connected to the rectifier circuit 4. As a result, the contactless communication antenna 2 is turned on and off of the switch 7 while supplying current to the rectifier circuit 4, and the electrical connection with the contactless interface 21 is interrupted.

In the present embodiment, any one of the memories of the control microcomputer 10 and the IC chip 20 may be used for data processing. That is, in the above-described embodiment, the data on the IC chip 20 side is calculated and stored in the memory 25. However, in the modified example of the embodiment, the data is calculated on the control microcomputer 10 side and stored in the memory of the control microcomputer 10. May be. In this case, the control microcomputer 10 performs arithmetic processing on the data acquired from the memory 25 of the IC chip 20 at the timing when it is electrically connected to the contact interface 22, and stores the data of the calculation result in its own memory. Then, the control microcomputer 10 drives the display unit 5 based on the data stored in its own memory to control the display contents.
Thus, in the present embodiment, the non-contact communication antenna also serves as the power supply antenna, so that the number of parts can be reduced and the IC card 1 can be downsized.
In the present embodiment, the control microcomputer 10 may be included in the IC chip 20, and the IC chip 20 and the control microcomputer 10 may be integrated.

In the present embodiment, the control microcomputer 10 outputs an instruction command for inducing cross access at a preset time interval. In this case, an ON / OFF signal of the switch 7 may be adopted according to the pressing operation of the physical button 6 and used as an input signal to the control microcomputer 10.
FIG. 6 is a diagram illustrating a configuration example in which an ON signal of the switch 7 is used as an input signal of the control microcomputer 10 as an example.
When the push button 6 is pressed and the switch 7 is turned on, the electrical connection state between the non-contact communication antenna 2 and the non-contact interface 21 is cut. Then, with the configuration in which the push button 6 and the control microcomputer 10 are electrically connected as shown in FIG. 6, an ON signal of the switch 7 (or a signal when the push button 6 is pressed) at the disconnection timing. Is input to the control microcomputer 10. The control microcomputer 10 uses the ON signal of the switch 7 as an input signal, and applies a voltage (supplies power) to the contact interface 22 at the input timing of the signal. Thereby, the contact interface 22 and the control microcomputer 10 are electrically connected for the first time. As a result, the instruction command for the contact interface 22 becomes valid, so that the control microcomputer 10 can access the memory 25 via the contact interface 22 by cross access.

  In the present embodiment, the display unit 5 may be configured by an LCD (Liquid Crystal Display) or the like. In this case, since the display of the LCD or the like disappears when the power supply is lost, the display of the display unit 5 is maintained only when the switches 7 and 28 are ON.

  In this embodiment, the switch 7 may be a physical switch, but may be a soft switch realized as software. For example, in the modification of the present embodiment, the communication between the reader / writer and the non-contact communication antenna 2 is disconnected by shifting the resonance frequency of the non-contact communication antenna 2. The electrical connection state with the non-contact interface 21 is disconnected. The disconnection of the connection state between the non-contact communication antenna 2 and the non-contact interface 21 is performed when a preset condition is satisfied. In this case, in the present embodiment, display on the display unit 5 can be automatically performed at an appropriate timing.

  Here, as a method of shifting the resonance frequency, there is a method of connecting a capacitor (a capacitor of about several pF to several tens of pF) in parallel with the switch. Further, as a preset condition, a preset time (for example, 10 ms) has elapsed from the time when the non-contact communication antenna 2 and the non-contact interface 21 are electrically connected, or reading is performed from a reader / writer. For example, the processing of the non-contact OS 23 for data (for example, storage processing in the memory 25) has been completed.

  In addition, when a non-volatile display device is used, information on display / non-display of data content is stored in a memory in the display unit, and data content is displayed in a non-display state with reference to the display / non-display information. A display control command for displaying “” may be transmitted to the display unit, and if it is in a display state, the display content may be deleted so that display / non-display can be switched by switching the switches 7 and 27. The display contents are switched, and information indicating display / non-display is updated in a memory in the control microcomputer or the IC chip. Further, information (identification information) indicating the display content on the display unit 5 is stored in the memory in the same manner, and the physical switch 28 is pressed and the information indicating the display content is referred to every time the switch 27 is turned on. The display contents such as the balance, points, and messages may be switched. The display contents are switched, and information indicating new display contents is stored in the memory.

  Further, the pressing operation of the physical switch 28 may be used as an input signal to the control microcomputer 10. FIG. 7 is a diagram illustrating a configuration example in which a signal of the pressing operation of the physical switch 28 is used as an input signal of the control microcomputer 10 as an example. According to this configuration, an input signal can be sent to the control microcomputer 10 independently of ON and OFF of the second switch 27. Therefore, even when power is supplied from the power supply antenna 3 and the built-in power supply 26 is disconnected from the control microcomputer 10, the display contents can be switched by operating the physical switch. Further, the display content can be changed by the number of times the physical switch 28 is pressed within a certain period.

  Further, the present embodiment is not limited to being applied to the IC card 1. For example, the present embodiment may be applied to an IC tag or a mobile phone.

  DESCRIPTION OF SYMBOLS 1 IC card, 2 Non-contact communication antenna, 3 Power supply antenna, 4 Rectifier circuit, 5 Display part, 6 Press button, 7 1st switch, 10 Control microcomputer, 11 Display control part, 20 IC chip, 21 Non Contact interface, 22 Contact interface, 23 Non-contact OS 24 Contact OS, 25 Memory, 26 Built-in power supply, 27 Second switch, 28 Physical switch

Claims (6)

A first interface and a second interface that mutually input and output data; a storage unit that stores data; and an arithmetic processing unit that processes data input from the first interface and outputs the processed data to the storage unit An IC chip having
A non-contact communication antenna for receiving at least data by non-contact and sending the received data toward the first interface;
A display that is driven by the transmitted power;
When the input / output of data to / from the arithmetic processing unit via the second interface becomes possible by operating with the transmitted power, the data stored in the storage unit is acquired, and based on the acquired data A control unit for controlling display contents of the display unit;
A power transmission antenna that is fed in a non-contact manner and transmits the fed power to the display unit and the control unit;
Built-in power supply that can supply power to the control unit,
A first switching unit that switches between a state in which power can be supplied from the built-in power supply to the control unit and a state in which power supply is disconnected;
And a second switching unit that switches permission and restriction of data transmission from the non-contact communication antenna to the first interface, and the second switching unit satisfies a preset condition Sometimes the transmission permission state of the data is limited, and the second switching unit presses the physical switch and switches the display content with reference to the information indicating the display content every time the second switching is turned on. noncontact communication medium characterized. The controller is
Means for determining whether power is supplied in a non-contact manner;
2. The contactless communication medium according to claim 1 , further comprising means for cutting off power supply from the built-in power supply in a state where power can be supplied from the built-in power supply to the controller. The arithmetic processing unit performs a predetermined arithmetic processing on the data input from the first interface and outputs the data to the storage unit,
3. The non-control device according to claim 1, wherein the control unit controls the display content of the display unit based on data obtained by the arithmetic processing unit acquired from the storage unit. Contact communication medium. Wherein the display unit, the non-contact communication medium according to any one of claims 1 to 3, characterized in that the transmission of the power to retain the display contents is stopped. It said non-contact communication antenna is non-contact communication medium according to any one of claims 1 to 4, characterized in that serves as the power transmission antenna. The control unit supplies power to the second interface when the second switching unit restricts the permission state of the data transmission so that the second interface can input and output data. The non-contact communication medium according to claim 1, wherein the contactless communication medium is a non-contact communication medium.

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