Display device comprising a beam combiner comprising a superimposition area for combining a first beam with a second beam which is not parallel thereto to form a common beam, an image-forming module and a holding device which can be placed on the head of a user and to which the beam combiner is fastened in such a way that a user, when the holding device is placed on the head, can see the real environment through the superimposition area of the beam combiner on the basis of the first beam, which is transmitted from the superimposition area, the image-generating module generating an image and directing it as the second beam onto the superimposition area in such a way that the user can perceive the image in superimposition with the real environment when the holding device is placed on the head, the beam combiner comprising a body which is transparent to the first beam and comprises the superimposition area, which the first beam encounters as it passes through the body, the second beam being guided in the transparent body as far as the superimposition area, characterized in that the superimposition area is divided into a first section and a second section, wherein only the first section, which is formed from a plurality of reflective and/or refractive deflecting elements spaced apart from one another, effects a deflection of the second beam by reflection and/or refraction in such a way that the first beam, after leaving the body, forms the common beam together with the deflected second beam, and wherein intermediate spaces are present between the individual deflecting elements due to the spaced arrangement of the deflecting elements, wherein the intermediate spaces are part of the second section, wherein the second section transmits the first beam and the first section has an imaging function for the second beam. a beam combiner comprising a superimposition area for combining a first beam with a second beam which is not parallel thereto to form a common beam, an image-forming module and a holding device which can be placed on the head of a user and to which the beam combiner is fastened in such a way that a user, when the holding device is placed on the head, can see the real environment through the superimposition area of the beam combiner on the basis of the first beam, which is transmitted from the superimposition area, the image-generating module generating an image and directing it as the second beam onto the superimposition area in such a way that the user can perceive the image in superimposition with the real environment when the holding device is placed on the head, the beam combiner comprising a body which is transparent to the first beam and comprises the superimposition area, which the first beam encounters as it passes through the body, the second beam being guided in the transparent body as far as the superimposition area, characterized in that the superimposition area is divided into a first section and a second section, wherein only the first section, which is formed from a plurality of reflective and/or refractive deflecting elements spaced apart from one another, effects a deflection of the second beam by reflection and/or refraction in such a way that the first beam, after leaving the body, forms the common beam together with the deflected second beam, and wherein intermediate spaces are present between the individual deflecting elements due to the spaced arrangement of the deflecting elements, wherein the intermediate spaces are part of the second section, wherein the second section transmits the first beam and the first section has an imaging function for the second beam.