Head-up display with constant orientation of the virtual image plane in the event of eye-box adjustment

A projection unit for a field-of-view display apparatus for use in a vehicle, the projection unit comprising:

• a picture-generating unit for generating a light beam with a display content;
• a mirror, arranged in a beam path of the light beam, having a first adjustment device, which is configured to tilt the mirror for adapting a beam propagation direction of the light beam to different eyebox positions of different users;
• and
• a second adjustment device, which is configured for an image-orientation-maintaining tilt of the picture-generating unit or of a further optical component in the beam path of the light beam, wherein:
• the projection unit is configured to generate a virtual display image in a virtual image plane in a field of view of a user by outputting the light beam in a direction of a reflection panel which is arranged in the field of view of the user and by which the light beam is reflected to the user's eyebox;
• and
• the image-orientation-maintaining tilt is configured such that the virtual image plane has a same predetermined orientation for different eyebox positions.