Abstract:
The general field of the invention is that of visualisation systems for an aircraft comprising a semi-transparent screen and electronic means suitable for generating a symbology displayed on said semi-transparent display screen, the symbology representing a parameter necessary for the piloting or navigation of the aircraft. The symbology according to the invention is partially or totally located on the periphery of the screen and comprises at least one moving pattern or a plurality of moving patterns, the speed and direction of the movement representing the relative difference between the value of the parameter at the present time and a reference value of said parameter, the patterns being immobilised when the value of the parameter at the present time attains said reference value. Different representations and different movements of the patterns are possible.