No, I have in my pocket a PayPal Security Key: it is the same size and thickness and flexibility as a credit card, yet it houses an e-paper display: https://www.paypal-community.com/t5/image/serverpage/image-i... They have been on the market for 5+ years, so the technology is there. Plastc has a bigger display, but there is no doubt it can fit in a credit card because an e-paper display does not require that much supporting circuitry. See this guy who tore down the PayPal card: http://www.stahlke.org/dan/displaycard/