A dynamically reconfigurable input button display provided on an operational face of multi-function physically displaceable buttons allows easy dynamic display of various operating modes or functions associated with operation of the button. The button forms part of a user interface of a input device, such as a piece of office equipment or a hand-held electronics device. The buttons may form an array in which a plurality of discrete functionality displays are provided on each of the buttons. The display is a thin film device, such as an organic LED display.