Display comprising: - a housing formed of a plurality of optically opaque walls (11, 13, 14) that separate the inside of the housing from the outside thereof, - an image generation unit, - an optical projection assembly that is suitable for projecting an image generated by the image generation unit in the direction of a semitransparent plate in order to form, with the semitransparent plate, a virtual image in the field of view of a user, - a light sensor, arranged inside said housing, suitable for delivering a signal that is representative of a luminous intensity that it receives, the display being designed such that the luminosity of an image generated by the image generation unit is controlled according to said signal, characterized in that the display further comprises a light guide located inside the housing of the display, having an input face and being shaped to collect, at its input face, luminous radiation originating outside the housing of the display, and to guide said luminous radiation to said sensor, and wherein the housing has an outer face, said housing has an opening through which said luminous radiation passes, the input face of the light guide is located at the level of this opening, the housing comprises a conduit extending from said outer face toward the inside of the housing to allow luminous radiation emitted by the image generation unit to pass out of the housing, the conduit is formed of a plurality of optically opaque walls (15, 15', 18), the input face of the light guide is located on said wall 15 of the conduit, and the conduit channels luminous radiation that is emitted by the image generation unit and sent to the semitransparent plate by the optical projection assembly. - a housing formed of a plurality of optically opaque walls (11, 13, 14) that separate the inside of the housing from the outside thereof, - an image generation unit, - an optical projection assembly that is suitable for projecting an image generated by the image generation unit in the direction of a semitransparent plate in order to form, with the semitransparent plate, a virtual image in the field of view of a user, - a light sensor, arranged inside said housing, suitable for delivering a signal that is representative of a luminous intensity that it receives, the display being designed such that the luminosity of an image generated by the image generation unit is controlled according to said signal, characterized in that the display further comprises a light guide located inside the housing of the display, having an input face and being shaped to collect, at its input face, luminous radiation originating outside the housing of the display, and to guide said luminous radiation to said sensor, and wherein the housing has an outer face, said housing has an opening through which said luminous radiation passes, the input face of the light guide is located at the level of this opening, the housing comprises a conduit extending from said outer face toward the inside of the housing to allow luminous radiation emitted by the image generation unit to pass out of the housing, the conduit is formed of a plurality of optically opaque walls (15, 15', 18), the input face of the light guide is located on said wall 15 of the conduit, and the conduit channels luminous radiation that is emitted by the image generation unit and sent to the semitransparent plate by the optical projection assembly.