Patent ID: 8467132

Claim:
A display device, comprising a holding device structured to be fittable onto the head of a user; an image-generating module which generates an image and is attached to the holding device, and a multifunction optical element including a coupling-in area and a coupling-out area attached to the holding device, wherein the generated image is coupled into the multifunction optical element via the coupling-in area, guided in the multifunction optical element to the coupling-out area and coupled out via the coupling-out area such that when the holding device is fitted onto the head the user can perceive the coupled-out image superimposed on surroundings, wherein the coupling-in area comprises a Fresnel structure which brings about a folding of the beam path during the coupling of the image into the multifunction optical element and has an imaging property, and wherein the Fresnel structure has several Fresnel segments, wherein optically effective facets of the Fresnel segments optically correspond to an imaginary optical effective surface which is curved and has neither mirror symmetry with relation to a center plane nor rotational symmetry with relation to a center axis.