Abstract: A keyboard having a series of parallel bars capable of mechanical displacement by downward thrust under the pressure of the user's fingers, and a luminous display system in which a tactile electric control screen forms the top of the bars. Circuits are used for producing control orders from at least bar data and key data, with the bar data being selected according to the bars depressed. Specific key functions are assigned electronically to screen zones disposed at intervals along each bar, and a controller provides the display system with a visual representation related to each key function in the corresponding screen zone.