Smart card reader with space-saving and combined user-specific data input and output

Smart card reader for controlling smart cards consisting of at least one display and one keyboard, whereby both the display and the keyboard is implemented with a single touch-sensitive screen,

• comprising a combined display and keyboard in the form of a touch-sensitive screen, which is embodied such that both the information output required according to a smart card reader standard and during a transaction via a display and the information input required according to smart card a reader standard and during a transaction via a keyboard are equally possible in that, with constant dimensions of the touch-sensitive screen used, the ratio between the area required for the information output and the area required for the information input is dynamically adjustable depending upon whether the display function or the keyboard function is to the fore for the currently pending transaction or the currently pending dialog step,
• wherein, if a larger area should be required for an information output on the touch-sensitive screen, the number of keys displayed on the touch-sensitive screen is reduced accordingly, and if, vice versa, a larger number of keys is required for the information input for the currently pending transaction or the currently pending dialog step, the area of the touch-sensitive screen for the information output is reduced accordingly.