This is impressive: a display that works on a flexible credit card.
One of the major security problems with smart cards is that they don’t have their own I/O. That is, you have to trust whatever card reader/writer you stick the card in to faithfully send what you type into the card, and display whatever the card spits back out. Way back in 1999, Adam Shostack and I wrote a paper about this general class of security problem.
Think WYSIWTCS: What You See Is What The Card Says. That’s what an on-card display does.
No, it doesn’t protect against tampering with the card. That’s part of a completely different set of threats.