Portable data carrier with optical display area

Abstract

Abstract A known portable data carrier (D) exhibits a visual display area which can be driven by the terminal and which is constructed as liquid-crystal display. Without energy supply, the display is only retained for a short time in a liquid-crystal display. According to the invention, the visual display area (AZ) is constructed as a foil with a layer which can be changed into the transparent and, respectively, non-transparent state by means of different temperatures. If the read device of the terminal is provided with a corresponding deleting and writing device, the display area of the data carrier can be filled with information items which are retained for an unlimited time. The invention can be used in all conceivable chip and magnetic cards, in which residual units or residual amounts can be visually displayed for the user. <IMAGE>

Inventors

• 👤 Klaus Dipl.-Ing. Moses

Bibliographic Details