Display device

In a luminous display device for displaying a message on a panel, the panel comprising n juxtaposed display subassemblies, each for the display of 1/n of the message by means of bundles of optical fibers, each subassembly including at least one light source, the improvement comprising:

• a main control circuit for generating a light intensity reference;
• and
• n second control circuits each associated with a respective one of the n display subassemblies, each secondary control circuit including means for receiving the reference and means for monitoring the light source of the associated subassembly so that each emitted light intensity corresponds to the reference light intensity;
• the monitoring means of each secondary control circuit comprising means for directly detecting each light intensity emitted by the associated light source, means for comparing each light intensity with said reference, and means for controlling the power supply to the associated light as a function of the result of comparison;
• the means for direct detection of each light intensity comprising at least one fiber of the bundle of optical fibers connected to a photoelectrical converter device;
• and
• the main control circuit being connected to at least one external sensor for measuring the lighting level in the environment of the display device in order to determine the light intensity reference.