COMPATIBLE LIGHTING DEVICE OF NIGHT VISION EQUIPMENT (S) WITH LATERAL INJECTION WINDOW OF DAY AND NIGHT LIGHT

摘要

A device for the backlighting of a liquid crystal matrix of a flat display screen in daytime or night vision mode with NVIS compatibility comprises a light guide GL which comprises a main form of straight block PP assembled at least an auxiliary prism PA1 with a right triangle base which comprises at least one reflecting face, and which is arranged with the main block to define on the same side face of the block, two separate injection windows, an injection window 11 for a source night lighting and an I2 injection window for a daytime lighting source. The night light is injected into the block, by reflection in or on the auxiliary prism in the direction of the respective injection window (11). The lateral face of the prism which receives directly the illumination emitted by the nocturnal source can comprise an FNVIS-c optical filter formed collectively on its surface by deposition of dielectric layers.