Operator interaction with electrical systems is facilitated by providing electromechanical control devices, which have switch buttons, rotary knobs or the like, with flat panel displays that convey information pertaining to the controls that can be changed instantly by a display controller. The display...http://www.google.com.au/patents/US5572239?utm_source=gb-gplus-sharePatent US5572239 - Operator/circuit interface with integrated display screen
