Method for implementing a device for displaying a real image

A method, comprising displaying a real image on a glazing fitted in a passenger compartment, wherein the displaying occurs with a device comprising a source emitting a beam of radiation of visible UV or IR laser or from a light-emitting diode, directed towards a portion of the glazing comprising a fluorescent material absorbing the radiation and re-emitting light in the visible region, the illumination of the portion by the beam enabling the image to be displayed on the glazing, wherein the method comprises:

• (a) identifying a set of positions i[1;n] where the source is to be located in the passenger compartment;
• (b) from a first position i1 of the source in the passenger compartment, emitting a polarized incident beam in such a way that its electromagnetic field is transverse magnetic;
• (c) for a whole portion of the glazing illuminated by the beam, measuring variations of an angle of incidence θ1, and determining a value of an angle θ1(Rmax) for which a reflection R1max of incident radiation by the glazing is maximal in the illuminated area and for the source location i1;
• (d) from a second location i2 of the source whose radiation is directed to illuminate substantially the same portion of said glazing, repeating the steps (b) and (c) so as to determine a value θ2(Rmax) for which a reflection R2max of the incident radiation by the glazing is maximal in said illuminated area and for the source location i2;
• (e) repeating the steps (b) and (c) for all source locations in;
• and
• (f) locating the source in a position i for which a value Rimax is minimal.