Display on a smartphone screen of a contactless card positioning pattern to improve near-field communication

摘要

The invention makes it possible to ensure the quality of NFC communication between a contactless card (10) and a smartphone (50). A positioning pattern (90), for example a portion of the map visual, is displayed on the screen (60) of the smartphone. This is a visual aid to help the user position the contactless card, near the smartphone, towards a position where a card indicator (19) provided on the card, typically the complementary portion of the card visual , is aligned with the displayed pattern. The positioning is made easy because the positioning pattern and the map indicator are preferably chosen to be visually complementary. Also, the contactless card is in the correct position when the card indicator visually complements the positioning pattern. The positioning pattern is thus displayed at a location on the screen allowing the best NFC coupling between the card and the smartphone. Figure for the abstract: Figure 7