Light device, especially a projector system of a headlight for motor vehicles

A light device, especially the projector system of a headlight for motor vehicles comprising a laser light source, a primary optical system with at least one diffractive optical element or with at least one reflective optical element to convert the monochromatic coherent light produced by the laser light source to a collimated beam of coherent light, a MOEMS comprising one or more micro-mirrors to route coherent light to a converter to convert the coherent light to white light, and a secondary optical system comprising at least one diffractive optical element or at least one reflective optical element to direct the white light further out of the light device and to create a light pattern on the display surface or in specific zones in front of the driver on a roadway, wherein the light device comprises a modulator situated between the laser light source and the secondary optical system along the route of a beam of light rays produced by the laser light source and advancing from this source to the secondary optical system, to influence the light characteristic of at least part of the beam, the light source further comprising an electromagnetic control system connected to the MOEMS and to the laser light source to control, through transmission of electric or electromagnetic signals, changes of the rotation angle, changes of the oscillation angle and changes of the oscillation rate and frequency of the free end of at least one of the micro-mirrors, and to control the activity of the laser light source, for controlled changing of the shape and/or position of the light pattern depending on current conditions where the vehicle finds itself during the vehicle's operation.