DIFFRACTIVE HEAD-UP DISPLAY DEVICE PROVIDED WITH A DEVICE FOR ADJUSTING THE POSITION OF THE VIRTUAL IMAGE

摘要

The invention relates to a diffractive head-up display device comprising a projection unit generating a light beam to be directed towards a diffractive combiner, the projection unit comprising a light source generating a projection light beam directed towards a display element for forming a source image transmitted towards the diffractive combiner. The device is characterised in that the projection unit comprises a projection mask arranged after the display element and provided with a projection window, the area of said window generally corresponding to the display area of the display element. The device is also characterised in that the light beam lights up an area larger than the display area, in a uniform manner, on the display element, and in that the display element and the mask are mobile in a translational manner, in at least one direction generally orthogonal to the axis of the projection light beam, in such a way that the adjustment of the position of the virtual image in the field of vision of the observer, for example the driver of a vehicle, is obtained by the translation of the display element and the mask.