Visa International is experimenting with credit cards that include a small display screen where customers could view recent transactions, bank balances, or local currency exchange rates.
About 10 percent of Visa's 1.2 billion credit and debit cards in use worldwide already have a built-in computer chip, and that proportion is growing rapidly. The chip can store information that could be displayed on a small screen running across the top of a card, in a position similar to the magnetic strip on the back of most cards today.
There are still several issues like security and battery life.