Patent ID: 11916618
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 6:
7. The NFC tag according to claim 3, further comprising:
a state storage circuit;
the control circuit is further configured to: identify the card reader through the energy conversion sub-circuit when the distance between the NFC tag and the card reader is within the predetermined distance range, determine whether the NFC tag is matched with the card reader, update a flag bit state in the state storage circuit to be a state of waiting for being charged when the NFC tag is matched with the card reader; update the flag bit state in the state storage circuit to be a charging completion state upon detecting that the voltage of the energy storage circuit has reached the rated voltage; and update the flag bit state in the state storage circuit to be a refreshing success state after the display content of the electronic ink display has been refreshed.