Patent ID: 9134535
Filing Date: 2015-09-15
Classification: G02B

Abstract:
1. A display device, comprising: a holding device configured to be placed on the head of a user; an image-generating module, secured on the holding device, configured to generate an image; and an imaging lens system, secured on the holding device, which includes a spectacle lens with a curved front and a curved back, and which is configured to project the image generated when the holding device is placed on the head such that the user can perceive it superimposed on the surroundings, wherein the light coming from the image-generating module is coupled via an entrance section into an optical channel in the spectacle lens, conducted in the optical channel to an exit section and coupled via the exit section out of the spectacle lens, wherein the optical channel includes, in a region of the curved front and the curved back, in each case, a first and a second Fresnel structure with a first facet and a second facet, on which the light conducted in the optical channel is reflected, and which are aligned parallel to one another, wherein owing to the first and second facets, the optical channel acts optically as a plane-parallel plate, and wherein the first facets are formed on the back of the spectacle lens and the second facets are formed on the front of the spectacle lens.