An IC card has a preregistered password and a display section which displays numerals and a cursor. An operator enters a password by moving the cursor to the desired numeral and presses a key. Fewer keys are thus required to enter passwords and the surface area of the card can be utilized more efficiently...http://www.google.de/patents/US4806745?utm_source=gb-gplus-sharePatent US4806745 - IC card with fewer input keys
