KR100478963B1 - Display smartcard and display control apparatus - Google Patents

Abstract

Produces CPU for operation processing, RAM for temporary data storage, EEPROM for data storage, ROM for program code storage, RF module for converting between RF signal and digital signal, and driving power for RF signal. A general RF chip 8 comprising a power supply unit; An RF antenna 7 for communicating with the RF card terminal; An LCD display unit 6 for externally displaying data stored in the RF chip; A storage battery 5 formed to occupy a substantial portion of an internal card area of the antenna line 7 so as to maintain a state of the LCD display unit; And a control apparatus 20 for a display RF card.

By implementing the smart card that displays the balance by the above configuration, it is possible to implement a card that can check the current balance at a low price.

Description

Display smart card and its control device {DISPLAY SMARTCARD AND DISPLAY CONTROL APPARATUS}

The present invention relates to an RF method or a contact type, mixed smart card widely used as an electronic money card. Existing real money not only has problems such as inconvenience of transaction, inconvenience of carrying, and cost of making money, but also makes it unsuitable for purchasing goods from far away. Electronic money is a currency composed of digital data to play the role of coins or banknotes in the virtual space of digital society based on digital data. More specifically, electronic money refers to goods that can be traded through a network such as the Internet or a communication network. .

There are two types of electronic money: network type electronic money and card type electronic money. Double card type electronic money can be realized more safely through smart cards, and it is expected to be deployed in this direction in the future. In general, smart cards are defined as `` credit card-sized plastic cards with integrated circuit chips that have the ability to handle specific transactions by having a microprocessor, card operating system, security module, memory, etc. '' . Types of such smart cards are classified into contact cards, contactless cards, and mixed cards according to data reading methods.

A contact card refers to an interface device that accommodates it, that is, a card in which a contact of a card is activated by contacting a contact of an interface device when inserted into a card terminal. A contactless card includes arithmetic elements and memory elements required for an information processing function. Same as the contact card, but the power supply for driving the chip in the card is made through the electromagnetic coupling of the coil in the card means a type of card using the electromagnetic induction method for communication with the interface device.

Finally, the hybrid card is a type of card that supports both contact and contactless card types, such as a Combi card (Combi card) and a hybrid card (Hybrid card). The two cards have something in common in that they support both contact and contactlessness, but the architecture is slightly different. Combi cards are chemically combined cards that share parts that can be shared by contact / contactless cards within a single card.The combination card allows the integration of heterogeneous applications (eg chip operating system, same key or password) through internal resource sharing. Can bring In a hybrid card, a contact card and a contactless card are physically separated from each other in a single card.

In general, a card-type electronic money is a prepaid card that requires a certain amount of charge in advance before its use. However, in a limited field of transportation cards, a postpaid card for post payment is used.

The card-type electronic money as described above is expected to expand its application field due to its convenience and similarity with cash, but despite the similarity with cash, the user could not easily check the balance. This may give the electronic money user a distrust of the electronic money system, and if it is implemented in postpayment, it may cause excessive consumption without knowing the usage history, and in the case of the prepaid electronic money, it may be charged in advance without knowing the balance. You may not be able to use it in time.

Although a number of smart cards with display devices have been applied for solving the above problems, most of them are a kind of smart card type application of an electronic notebook with a microcontroller, a power supply, and a display device. The method was unknown to those skilled in the art at all, and even though some implementations were possible, the cost was unrealistically expensive and was not practical at all.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an electronic money card in which a balance (in case of a postpaid card) in an electronic money card is displayed.

Another object of the present invention is to provide an electronic money card in which a balance is displayed at a relatively low cost.

Another object of the present invention is to provide an RF card control device for controlling a power charging device and a display device in a card to implement the electronic money card of the above object.

The present invention provides a power supply unit for producing an operating power source for implementing the electronic money card, an RF / digital modulator for converting a transmission signal of a wireless card terminal into a digital signal, and a CPU for arithmetic processing; RAM for temporary data storage; EEPROM for data storage; A program code storage ROM; A display output unit configured to output a data value stored in a part of the EEPROM area to an external display device; It is another object of the present invention to provide a chip for an RF card, comprising a charging control unit for storing power to an external power storage device when communicating with an RF card and the terminal.

The present invention has another object to achieve the same object to the above configuration not only RF type smart card, but also contact smart card, combination smart card, hybrid smart card.

The present invention is provided with a charging device (economically preferably metal foil capacitor) and a display device (preferably LCD panel) in the RF card to achieve the above object, having a control device for controlling this or to provide a control function Use the added RF card chip.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Example 1)

As shown in Fig. 1, the RF card of the present invention for achieving the above object has an arithmetic processing CPU, a temporary data storage RAM, a data storage EEPROM, a program code storage ROM, and an RF signal. And a general RF chip 8 comprising an RF module for converting between digital signals and a power generation unit for generating a driving power from the RF signal; An RF antenna 7 for communicating with the RF card terminal; An LCD display unit 6 for externally displaying data stored in the RF chip; A storage battery 5 formed to occupy a substantial portion of an internal card area of the antenna line 7 so as to maintain a state of the LCD display unit; And a control apparatus 20 for a display RF card.

As shown in Fig. 2, the control apparatus 20 for a display RF card for use in the RF card of the present invention includes: a power production unit 21 for producing operating power from a transmission signal of a wireless card terminal; An RF / digital modulator 22 for converting a radio signal of the RF card terminal into a digital signal; A data selector 28 for selecting data to be displayed to the outside of the converted digital signals; A display output unit 26 for outputting the external display data to an external display device; Charging control unit 24 for storing the power to the external power storage device when communicating with the RF card and the terminal.

The display RF card control device 20 will be described in detail as follows. The configuration and operation of the power generator 21 and the RF / digital modulator 22 are the same as those of the power generator and the RF / digital modulator in the RF card chip, which are generally used, and the RF / digital modulator 22 ) Receives the radio transmission signal of the RF card terminal from the RF antenna coil 7 and modulates it into a digital signal. The display RF card controller 22 is preferably composed of one chip and is mounted separately from the general RF card chip 8 in the RF card. In terms of security and execution speed, the data storage unit (EEPROM) in the RF card chip is used to display the communication information between the RF card (exactly, RF card chip) and the terminal rather than directly accessing the storage area of the RF card chip. It is desirable to find a portion in which information to be displayed in the display is displayed on the external display device. To this end, the data selector 28 stores a specific bit string pattern and a distance value from the specific bit string pattern, and the data received by the RF card chip 8 from the RF card terminal through the RF antenna 7. A specific bit string pattern is recognized among the bit strings, and data (a predetermined length) at a position separated by a distance value stored from the specific bit string pattern is selected. This is because the signal between the RF card chip and the terminal has a fixed specific pattern and a balance (or amount of use) to be displayed to the outside in a certain position. When the balance value exists in the output signal of the RF card chip, it generally occurs at the time of payment processing for paying for the goods or service, and for charging a certain amount. Therefore, the data selector 28 must store the specific bit string pattern and the distance value during payment processing and the specific bit string pattern and the distance value during charging.

The data selector will describe the process of finding the filling liquid record in more detail as follows. The data selector 28 records a specific bit string pattern in units of bytes. That is, a specific byte string is recorded, and the recording can record a specific value and an arbitrary value. The arbitrary value is that any value may be recorded in the byte string, because a byte having a specified value may exist in the transmission signal string of the terminal. For example, the full text sent to the RF card by the RF terminal during payment processing is called 'A1', where the third byte is a record, and 'C9', where the sixth byte is the balance where the balance value is recorded. Suppose that the value is 'FF' and the balance value to be recorded starts from the tenth byte of the preamble. In this case, " FFFFA1FFFFC9 " or " A1FFFFC9 " should be recorded in the specific bit string pattern storage section of the data selection section 28, and '4' should be recorded in the selection data offset storage section. The data selector 28 continuously searches for a signal from the RF terminal to find a pattern equal to a value stored in the specific bit string pattern storage. If the same pattern is found, it will display data from the fourth byte after the pattern ends in the data string in which the pattern exists (usually 4 bytes are allocated for the current balance of the RF card, but the actual use is 3 bytes). Select with data.

The display RF card control apparatus 20 outputs the remaining balance value captured by the data selector 28 to the outside through the display output unit 26. The output method can be either serial or parallel, and the serial method is easy to configure the card, but a display control device is required. The parallel method can be directly connected to the display without a separate device, but the card configuration is complicated. Preferably, the parallel type integrated with the display is advantageous in terms of card implementation or cost. Since the display uses a low power LCD (6), the display output generates a potential difference to drive / maintain the liquid crystal state, the energy source of which uses an external charging device (5), the liquid crystal state is powered off the RF card Is maintained.

The charging control unit 24 is for charging the external charging device 5 with the output signal of the RF card terminal received through the RF antenna (7), the external charging device (5) to the external display (6) Save power to maintain state. In order to simply configure the charging control unit 24, the terminal output signal may be rectified by a half-wave rectifier circuit using one diode so as to charge the external charging device (in this case, since the diode also serves to prevent discharge, the configuration is simplified). In addition, switching the power of the power production unit 21 may be implemented to use. The charging control unit 24 maintains charging of the external charging device 5 when the RF card is separated from the active area of the terminal (the effective area of the terminal antenna propagation is activated in this area). (5) supplies power required to maintain the display state of the balance value changed by payment processing or charging.

Detailed description of the configuration and operation of the display RF card of the present invention is as follows. The display RF card is for minimizing the manufacturing cost of the display RF card, comprising the display RF card control device 20, a display panel 6 of the LCD panel, and a capacitor (capacitor) formed in the form of a plate in the center of the card ( 5) consists of. For low manufacturing cost, the capacitor 5 is implemented by filling an insulating material between two metal foils, and the LCD panel 6 and the display RF card control device 20 are preferably integrally implemented. The display RF card control device 20 is connected to the RF antenna 7 of the RF card, and internally uses a voltage divider or classifier to use a portion of the RF signal as its input signal and operating power (in contrast to the RF It may be used to supply power to the external charging device by providing a coil for charging separate from the antenna). The capacitor 5 can sufficiently use the empty area in the antenna coil 7 as long as it does not interfere with the operation of the antenna, thereby obtaining a considerable storage capacity at low cost. The LCD panel 6 displaying the internal balance value maintains the state of the liquid crystal by the voltage between the terminals, which requires relatively low power, and can maintain the same state for a considerable time even with the power stored in the capacitor 5. . Accordingly, the user of the RF card can check the usage balance indicated by the number on the LCD panel 6 provided in the RF card for a considerable time even after payment processing or charging.

When payment processing (or charging) is performed on a commonly used RF card chip, the RF card terminal sends a payment processing signal (or a charging completion signal) to the RF card chip according to a promised protocol, which includes several data elements. Among them is the balance value after payment processing. The display RF card controller finds the balance value from the signal and outputs the balance value to the LCD panel to display the balance value, and charges the capacitor with energy of a signal sent from the terminal to the RF card. The driving power of the LCD panel is obtained from the capacitor, and the display state of the LCD is maintained for a considerable time with the energy stored in the capacitor even when the RF card is out of the active area of the terminal.

(Example 1-2)

Since the RF card chip 8 currently used does not have a process of receiving a confirmation after sending the balance to the terminal during payment processing, in the first embodiment, the desired balance value was found from the signal of the RF card terminal. However, this causes a problem that the remaining balance value and the displayed value are different when the payment process is ended in error. Therefore, preferably, if the protocol specification of the RF card chip allows, the RF card sends a completion signal including the balance value after payment processing (or charging), and it is preferable to find and display the balance value in the completion signal.

The RF card of the present invention for achieving the above object is an RF chip (8) consisting of an internal processing CPU, a temporary data storage RAM, a data storage EEPROM, and a program code storage ROM therein; An RF antenna 7 for communicating with the RF card terminal; An LCD display unit 6 for externally displaying data stored in the RF chip 8; A storage battery 5 for maintaining the state of the LCD display unit 6; And a control apparatus 20 for a display RF card.

The control device for a display RF card 20 to be used in the RF card of the present invention includes a power production unit 21 for producing operating power from a signal transmitted from a wireless card terminal; An RF / digital modulator 22 for converting a transmission signal from the RF card chip 8 to a terminal into a digital signal; A data selector 28 for selecting data to be displayed to the outside of the converted digital signals; A display output unit 26 for outputting the external display data to an external display device 6; Charging control unit 24 for storing power to the external power storage device (5) when communicating with the RF card and the terminal.

The display RF card control device 20 will be described in detail as follows. The configuration and operation of the power generator 21 is the same as the power generator 21 in the RF card chip 8 which is generally used, and the RF / digital modulator 22 is transmitted to the card from a general RF card terminal. Performs the same operation as the modulator of the RF card terminal for modulating the signal into a digital signal. The RF / digital modulator 22 receives the output data of the RF card chip 8 from the RF antenna coil 7 and modulates it into a digital signal. The display RF card controller 20 is preferably composed of one chip, and is mounted separately from the general RF card chip 8 in the RF card. For security purposes, the data storage unit (EEPROM) in the RF card chip 8 is not directly accessed by the display RF card controller, but the portion where information is to be displayed in the communication message between the RF card (strictly, the RF card chip) and the terminal. It is desirable to find and display it on an external display device. To this end, the data selector 28 stores a specific bit string pattern and a distance value from the specific bit string pattern, and specifies a data bit string output from the RF card chip 8 through the RF antenna 7. A bit string pattern is recognized and data (a predetermined length) at a position separated by a distance value stored from the specific bit string pattern is selected. In the case where the RF card protocol is implemented such that the balance value is present in the output signal of the RF card chip 8, the balance value is generally applied to the RF card chip (at the time of payment processing for payment of goods or service charges and at a certain amount of charge). Will be output in 8). Therefore, the data selector 28 must store the specific bit string pattern and the distance value during payment processing and the specific bit string pattern and the distance value during charging. Since each data element constituting the output data is generally specified to have a predetermined length, it is possible to determine a desired balance value from the output signal of the RF card chip if the protocol in which the balance value is output and the location of the balance value are known.

For example, a specific bit string indicating a charge completion signal (or a payment processing signal) is displayed in a header portion of a charge completion signal and a payment processing signal, which are signals for which the balance value is output, and the balance value is located at a distance away from the specific bit string. Configure a charge completion signal (or payment processing signal) having a field. The specific bit string pattern and the distance value between the pattern and the balance value field are stored in the data selection section of the display RF card control device. Then, the data selector 28 can find out the balance value from the output signal of the card in the charging completion signal or the payment processing signal.

The display RF card control apparatus 20 outputs the remaining balance value captured by the data selector 28 to the outside through the display output unit 26. The output method can be serial or parallel. Since the display uses a low-power LCD, the display output unit 26 generates a potential difference to drive / maintain the liquid crystal state. The energy source uses an external charging device 5, and the liquid crystal state is supplied with power to the RF card. It stays off. The charging control unit 24 is for charging the external charging device with the output signal of the RF card terminal received through the RF antenna (7).

Detailed description of the configuration and operation of the display RF card of the present invention is as follows. The display RF card is to minimize the manufacturing cost, and includes the display RF card control device, and comprises an LCD panel display and a capacitor (capacitor) formed in a plate shape in the center of the card. The capacitor is implemented using a metal foil, and the LCD panel and the display RF card control device is preferably implemented integrally. The display RF card control device is connected to the RF antenna of the RF card, and internally uses a voltage divider or a classifier to use a part of the RF signal as its input signal and an operating power source. A coil may be provided to supply power to the external charging device). The LCD panel displaying the internal balance value maintains the state of the liquid crystal by the voltage between terminals, which requires a relatively low power, and can maintain the same state for a considerable time even with the power stored in the capacitor. Accordingly, the user of the RF card can check the usage balance indicated by the number on the LCD panel provided in the RF card for a considerable time even after payment processing or charging.

According to the protocol promised during payment processing (or charging), the RF card chip sends a payment processing completion signal (or charging completion signal) to the RF terminal, which contains several data elements, including the balance value after payment processing. have. The display RF card controller finds the balance value from the signal and outputs the balance value to the LCD panel to display the balance value, and charges the capacitor with energy of a signal sent from the terminal to the RF card. The driving power of the LCD panel is obtained from the capacitor, and the display state of the LCD is maintained for a considerable time with the energy stored in the capacitor even when the RF card is out of the active area of the terminal.

(Example 2)

The RF card displaying the balance value may be implemented by separately providing the display RF card control device as described above with the RF card chip, but it is most preferable to have terminals connected to an external charging device to drive the display on the RF card chip itself. something to do. Therefore, the present invention also describes an embodiment of an RF card chip that performs the above functions.

As shown in Fig. 4, the RF card chip 30 for the display RF card includes a power production unit 31 for producing an operating power from the output signal of the RF card terminal; An RF / digital modulator 32 for converting RF signals and digital signals used for communication with the wireless card terminal; A CPU 34 for arithmetic processing; A temporary data storage RAM 36; An EEPROM 42 for storing data; A program code storage ROM 38; A display output unit 46 for outputting data values stored in a part of the EEPROM area to an external display device 6; It is characterized in that it is provided with a charging control unit 44 for storing power to the external power storage device (5) when communicating with the RF card and the terminal. For the purpose of security, the externally displayed area should be limited to a partial area specified in the EEPROM, and the value stored in the partial area can only be read by the display output unit 46, and the display area 46 of the partial area can be read. Implement so that the stored value cannot be changed. In an actual implementation, the area storing the current balance value will be a partial area designated for the external output.

The power generator 31 has the same configuration as the power generator of a general RF card chip and receives the output signal of the RF card terminal to produce power for driving an RF card. The RF / digital modulator 32 is also a general RF card. Like the RF / digital modulation section of the chip, the radio signal from the terminal is converted into a digital signal or a digital signal into an output radio signal. The CPU 34 executes a program stored in the ROM 38 and performs conflict processing (anti-collusion loop), authentication, encryption / decryption, and the like. The RAM 36 functions as a temporary data store for the operation of the CPU 34. A program to be executed by the CPU 34 is input to the ROM 38. The EEPROM 42 is a place where data (security key, balance value, user information) to be maintained even without power is stored. The power generator 31, RF / digital modulator 32, CPU 34, RAM 36, EEPROM 42 and ROM 38 is not different from the case of a typical RF card chip, so the detailed description It will be omitted. The display output unit 46 uses the energy stored in the external charging device 5 to control the potential for driving the display (LCD) 6, which is an RF card chip away from the terminal active area. It is maintained even if the power supply to 30 is turned off. The display output unit 46 may be implemented in a serial method or a parallel method. In the case of a serial method, the card is simple to implement, but an LCD driver is required separately (a connection between a capacitor and an LCD driver is also required) and a parallel method. In this case, it can be directly connected to the LCD, but the card implementation is complicated by many output terminals. The display output unit 46 implements a value stored in a portion of the EEPROM region 42 to be output to the outside of the RF chip 30 as it is. The charging control unit 44 is for charging an external charging device (metal foil capacitor) 5 and charges the power of the output signal of the RF card terminal to the capacitor 5, and is connected to the external charging capacitor 5. It has a terminal for

As shown in FIG. 3, the display RF card implemented using the above-described display RF card RF card chip 30 may include a driving power generator 31 and an RF / converter that converts radio signals and digital signals. Digital modulator 32, arithmetic processing CPU 34, temporary data storage RAM 36, data storage EEPROM 42, program code storage ROM 38, and an external display device. An RF chip comprising a display output unit 46 for outputting data values stored in a part of the EEPROM region, and a charge controller 44 for storing power to an external power storage device 5 when communicating with an RF card and the terminal. 30; An RF antenna 7 for communicating with the RF card terminal; An LCD display unit 6 for displaying the data stored in the RF chip 30 to the outside; Characterized in that the storage battery 5 for maintaining the state of the LCD display unit (6).

The operation of the display RF card will be described below. When the RF card enters the active area of the RF card terminal, the RF card chip 30 performs initialization, anti-collision algorithm (anti-collusion loop), authentication, and corresponding tasks, and at the same time, the battery 5 The charging is performed by the output signal of the RF card terminal (actually, the charging by the power of the internal power generator 31 is included in this expression since the fundamental energy source is the output signal of the terminal). When the RF card chip 30 performs a corresponding task such as payment processing or charging, the RF card chip 30 has a field (part of the EEPROM area) for storing a current balance on the display output unit 46. It is preset to output the value stored in the current balance field. Therefore, when the current balance value is changed according to the performance of the RF card chip 30 during the payment processing or the charging operation, it is displayed on the external display device (LCD) 6 as it is, and the LCD display output unit 46 is the capacitor. The driving potential is maintained for a considerable time with the energy stored in (5). Accordingly, the RF card user can check the current balance through the LCD panel 6 provided in the card even after using the card.

(Example 3)

As an electronic money card displaying the balance value therein, a contact smart card can be used as well as an RF card. In the case of a contact card, for security purposes, when a payment processing (or charging operation) is completed, it is common to send a completion signal including a current balance value from a smart chip to a terminal, and an electronic money operator constructs a transmission signal. It is freer than a card, and the output of the smart chip is digital, making it much easier to implement the displayed card.

As shown in Fig. 5, the smart card of the present invention for achieving the above object has a CPU for operation processing, a RAM for temporary data storage, an EEPROM for data storage, a ROM for program code storage, and a contact interface. A smart chip 9 consisting of parts; A contact terminal for communicating with the smart card terminal; An LCD display unit 6 for displaying data stored in the smart chip to the outside; A storage battery 5 for maintaining the state of the LCD display unit 6; It characterized in that it comprises a control device for display smart card (50).

As shown in Figure 6, the control device for a display smart card 50 for use in the smart card of the present invention is connected to the Vcc terminal of the smart card contact terminal is a power input unit for receiving the use power, and the smart A serial interface unit 52 connected to a data input terminal of the card contact terminal and including a digital input unit for receiving a digital signal; A data selector 58 for selecting data to be displayed externally from the input digital signal; A display output unit 56 for outputting the external display data to an external display device 6; When the smart card is separated from the terminal, it is characterized in that the charge control unit 54 for storing the power for maintaining the external display 6 to the external charging device (5).

The display smart card controller 50 will be described in detail as follows. The power input unit is connected to the Vcc terminal and the ground terminal of the smart card contact terminal, and receives power from the smart card terminal required for driving the display smart card controller (which is also a power source for charging an external charging device). . The display smart card controller 50 is preferably composed of one chip and is mounted separately from the general smart chip 9 in the smart card. In terms of security and execution speed, the data storage unit (EEPROM) in the smart chip 9 has information to be displayed in the communication text between the smart chip 9 and the terminal, rather than directly accessed by the display smart card controller 50. It is desirable to find the portion and display it on the external display device 6. To this end, the data selector 58 stores a specific bit string pattern and a distance value from the specific bit string pattern, and selects a specific bit from a data bit string output by the smart chip 9 to the terminal through a contact interface. A column pattern is recognized and data (a predetermined length) at a position separated by a distance value stored from the specific bit string pattern is selected. This is based on the fact that, among the signals between the smart chip 9 and the terminal (usually catches the charge confirmation and payment confirmation signal), there is a fixed specific pattern and a balance value (or value used) to be displayed outside. will be. When the balance value exists in the output signal of the smart chip 9, it generally occurs at the time of payment processing for paying for the price of goods or service and for charging a certain amount. Therefore, the data selector 58 must store a specific bit string pattern (generally a byte string value indicating payment processing) and a distance value and a specific bit string pattern and distance value at the time of the payment processing.

The process of the data selector 58 to find the filling liquid record will be described in detail as follows. The data selector 58 records a specific bit string pattern in units of bytes. That is, a specific byte string is recorded, and the recording can record a specific value and an arbitrary value. The arbitrary value is that any value may be recorded in the byte string, because there may be a byte having a specified value in the smart chip transmission signal string. For example, when the payment processing is completed, the smart chip sends a payment processing completion signal to the terminal. The specialized signal is composed of 'A1A1', which means that the third and fourth bytes are the payment processing completion signal. The balance value to be recorded is displayed. The integrity signal is attached to the end of the preamble signal, and 'FF' is used to indicate an arbitrary value. In this case, "FFFFA1A1" or "A1A1" should be recorded in the specific bit string pattern storage section of the data selection section, and "5" (9-4 = 5) should be recorded in the selection data offset storage section. The data selector 58 continues to search for signals from the smart card terminal to find a pattern equal to the value stored in the specific bit string pattern storage. If the same pattern is found, the data from the 5th byte (stored value in the selected data offset storage) after the end of the pattern in the data string in which the pattern exists is normally allocated 4 bytes for the current balance of the smart card. The actual usage is 3 bytes).

(Example 4)

The smart card on which the balance value is displayed may be implemented by including a display smart card controller separately from the smart chip as described above, but it is most preferable to have terminals connected to an external charging device to drive the display in the smart chip itself. . Therefore, the present invention also describes an embodiment of the smart chip 60 to perform the above function.

As shown in FIG. 8, the digital input unit connected to the Vcc terminal of the contact terminal board on the smart card to receive the use power and the data input terminal of the contact terminal board on the smart card to receive the digital signal A serial interface unit 62 including; CPU 64 for calculation processing; RAM 66 for storing temporary data; An EEPROM 72 for storing data; A program code storage ROM 68; A display output unit (76) for outputting data values stored in a part of the EEPROM area to an external display device (6); It is characterized in that it comprises a charge control unit 74 for storing power to the external power storage device 5 when communicating with the smart card and the terminal.

The CPU 64 executes a program stored in the ROM 68 and performs authentication, encryption / decryption, and the like. The RAM 66 functions as a temporary data store for the operation of the CPU 64. A program to be executed by the CPU 64 is input to the ROM 68. The EEPROM 72 is a place where data (security key, balance value, user information) to be maintained even without power is stored. Since the serial interface 62, the CPU 64, the RAM 66, the EEPROM 72, and the ROM 68 are not different from those of the general RF card chip, detailed description thereof will be omitted. The display output unit 76 maintains a potential for driving the display (LCD) 6 using energy stored in the external charging device 5, which is a smart card which is released from contact with the terminal. It is maintained even if the power supply to 60 is turned off. The display output unit 76 may be implemented in a serial method or a parallel method. In the case of a serial method, a card is simple to implement, but an LCD driver is required separately (a connection between a capacitor and an LCD driver is also required) and a parallel method. In this case, it can be directly connected to the LCD, but the card implementation is complicated by many output terminals. The display output unit 76 implements a value stored in a portion of the EEPROM region to be output to the outside of the smart chip 60 as it is. The charging control unit 76 is for charging an external charging device (metal foil capacitor) 5 and charges the power input from the power input unit to the capacitor, and has a terminal for connecting to the external charging capacitor 5. have.

As shown in FIG. 7, the display smart card implemented using the display smart card smart chip 60 includes a serial interface unit 62 including a driving power input unit and a digital input unit for receiving a digital signal. And the CPU 64 for arithmetic processing, the RAM 66 for temporary data storage, the EEPROM 72 for data storage, the ROM 68 for program code storage, and the external display device 6 for the EEPROM area. A smart chip 60 comprising a display output unit 76 for outputting a data value stored in a part of the charging unit, and a charging control unit 74 for storing power to the external power storage device 5; A contact terminal forming a contact interface with the smart card terminal; An LCD display unit 6 for displaying data stored in the smart chip to the outside; Characterized in that the storage battery 5 for maintaining the state of the LCD display unit (6).

The operation of the display smart card will be described below. When the smart card and the smart card terminal is interfaced, the smart chip 60 performs the initialization, authentication and corresponding tasks, and at the same time, the battery 5 is charged. When the smart chip 60 performs a corresponding task such as payment processing or charging, a field (some of EEPROM areas) for storing a current balance is matched to the display output unit 76 to output a value stored in a current balance field as it is. It is set in advance as possible. Therefore, when the current balance value is changed according to the performance of the smart chip 60 during the payment processing or the charging operation, it is displayed on the external display device (LCD) 6 as it is, and the LCD display unit 76 stores the capacitor 5 Maintain the driving potential for a considerable time with the energy stored in Accordingly, the smart card user can check the current balance through the LCD panel 6 provided in the card even after using the card.

In the above embodiments of the present invention, since the balance value to be displayed is generally stored as a binary value, the output value of the display output unit is converted into a decimal value, and the binary value corresponds to each digit of the decimal number. The value is the value output to each LCD element.

In the case of a combination card or hybrid card which interfaces with the present invention in a contact or contactless manner, as described above, a display method and apparatus used for an RF (contactless) card, or a display used in a contact card. It is obvious that the configuration of the display card using only one implementation or both of the methods and apparatuses is in accordance with the above description and is also within the scope of the present invention.

When implementing a smart card that displays the balance by the above configuration is possible to implement the card at a low price, it is a useful invention that contributes to the construction of a credit society by expanding the field of use of smart cards.

Figure 1 shows the configuration of an RF type display card implemented in the first embodiment of the present invention.

2 shows the structure of a display control apparatus for an RF card used in the first embodiment of the present invention.

Figure 3 shows the configuration of the RF display card implemented in the second embodiment of the present invention.

Figure 4 shows the structure of the RF chip for RF display smart card used in the second embodiment of the present invention.

5 is a block diagram of a contact display smart card implemented as a third embodiment of the present invention.

6 shows the structure of a display control device for a contact smart card used in the third embodiment of the present invention.

7 illustrates a configuration of a contact display smart card implemented in the fourth embodiment of the present invention.

8 illustrates the structure of a smart card chip for a touch display smart card used in a fourth embodiment of the present invention.

Claims (6)

In the RF card control device provided in the RF card to interface with the RF card chip, A power generation unit for producing an operating power from a transmission signal of the RF card terminal; An RF / digital modulator for converting a transmission signal between the RF card chip and the RF card terminal into a digital signal; A data selector for selecting display data among the converted digital signals; A display output unit provided on the RF card and outputting the selected display data to a display device external to the RF card controller; A charge control unit provided in the RF card during communication between the RF card and the RF card terminal and storing power to a power storage device external to the RF card controller for supplying power for maintaining a display state of the display device; RF display card control device, characterized in that consisting of. Produces internal CPU for operation processing, RAM for temporary data storage, EEPROM for data storage, ROM for program code storage, RF module for converting between RF signal and digital signal, and driving power for RF signal. An RF chip including a power production unit to perform; An RF antenna for communicating with an RF card terminal; A display device for externally displaying data stored in the RF chip; A power storage device for supplying power for maintaining the display state of the display device; RF display card control device of claim 1; RF type display smart card comprising a. CPU for operation processing, RAM for temporary data storage, EEPROM for data storage, ROM for program code storage, RF / digital modulator (RF module) for converting between RF signal and digital signal, RF A power generation unit for producing driving power from a transmission signal of a card terminal, a display output unit for matching data with a part of the EEPROM area to output data of the matched area to the outside, an RF card and the RF card terminal An RF chip including a charging control unit that stores power in a power storage device outside the RF chip during communication between the RF chip and the power storage device; An RF antenna for communicating with an RF card terminal; A display device for externally displaying data output from the display output unit; And a power storage device for supplying power for maintaining the display state of the display device. In the contact smart card controller provided in the contact smart card to interface with the contact smart card chip, A serial interface unit connected to a Vcc terminal of a smart card contact terminal and receiving a driving power, and a digital input unit connected to a data input terminal of the smart card contact terminal and receiving a serial digital signal; A data selector which selects display data from the input digital signals; A display output unit provided on the contact smart card and outputting the selected display data to a display device external to the contact smart card controller; Even when the contact smart card and the contact smart card terminal are separated, power for maintaining the display state of the display device is provided in the contact smart card and stored in a power storage device outside the contact smart card controller. Contact control smart card controller, characterized in that consisting of; A contact smart card chip having an arithmetic processing CPU, a temporary data storage RAM, a data storage EEPROM, a program code storage ROM, and a contact interface therein; A contact terminal for communicating with the smart card terminal; A display device for externally displaying data stored in the smart card chip; A power storage device for supplying power for maintaining the display state of the display device; The touch display smart card control device of claim 4, comprising: a touch display smart card. Serial interface including drive power input and digital input to receive digital signal, CPU for operation processing, RAM for temporary data storage, EEPROM for data storage, ROM for program code storage, external display device A smart card chip including a display output unit for outputting data values stored in a part of the EEPROM area to the outside of the smart card chip, and a charging control unit which stores power to a power storage device external to the smart card chip; A contact terminal forming a contact interface with the smart card terminal; A display device for externally displaying data stored in the smart card chip; And a power storage device for supplying power for maintaining the display state of the display device.