Projection device for an image generator unit of a head-up display image generating unit, method for operating a projection apparatus and method for generating an image in a head-up display

The invention relates to a projection device for an image generating unit (102) of a head-up display (100). The projection device comprises at least one light source for emitting a light beam, at least one image forming unit for forming an image (112) using the light beam and at least a modulation unit, which is adapted to be suppressed by modulation of the light beam a speckle pattern in forming the image (112) ,