Bank card with display screen
View Patent ↗In order to allow a display of the latest transactions, a smart card 100 c for secure transactions comprises at least one secure chip 101 c , for example of the EMV type, with at least one communication interface to communicate with a card reader in order to carry out a transaction, an electronic display 103 , an independent battery 104 , a card reader circuit 150 c connected to a communication interface of the secure chip in order to access the information contained in the secure chip to be able to display it on the display.
1. A smart card for secure transactions comprising inside smart card body:
at least one secure chip comprising:
a communication interface in order to communicate with a card reader external to the smart card so as to carry out a transaction; and
information stored in a memory of the secure chip;
a card reader circuit connected to the secure chip via a switching circuit connected between the communications interface of the secure chip and a processor of the card reader circuit wherein the card reader circuit communicates with the secure chip using the same communications protocol as the reader external to the smart card uses to communicate with the secure chip; and
an electronic display connected to the card reader circuit; and an independent battery; wherein
the switching circuit allows communication between the communications interface of the secure chip and the processor of the card reader circuit in order to allow the card reader circuit access to the information stored in the memory of the secure chip so as to be able to display the information on the electronic display when the switches are closed.
2. The card according to claim 1 , wherein the reader circuit only accesses public information of the secure chip.
3. The card according to claim 2 , wherein the public information includes the amounts of the transactions completed.
4. The card according to claim 1 , wherein the card comprises an actuator to allow a holder of the said card to trigger reading and display the information read.
5. The card according to claim 4 , wherein the actuator is a motion sensor.
6. The card according to claim 1 , wherein the card comprises a usage sensor to inhibit or enable the working of the reader circuit.
7. The card according to claim 6 , wherein the usage sensor is a light sensor.
8. The card according to claim 1 , wherein the communication interface is a contact type interface and wherein the internal card reader circuit is connected in parallel to the contacts of the card.
9. The card according to claim 1 , wherein the communication interface is a contactless interface with a first antenna formed of turns inside the card and wherein the reader circuit has a second antenna formed of turns inside the card, the first and the second antenna sharing a common electromagnetic flux.
10. The card according to claim 9 , wherein the communication interface disables the working of the card reader circuit if an external field is detected.
11. The card according to claim 1 , wherein the secure chip has two communication interfaces, and wherein at least one communication interface is connected to the reader circuit.
12. The card according to claim 1 , wherein the communication interface of the secure chip is a communication interface according to ISO7816 standard and/or ISO14443 standard and wherein the card reader circuit is a reader according to ISO7816 standard and/or ISO14443 standard.
13. The card according to claim 1 comprising an activation device connected to the processor of the card reader circuit and wherein the processor is operable to close the switches in response to an activation signal from the activation device.