A screen (3) for an HMD (1) is provided, and may be designed as a display screen or as a projection screen. The screen (3) comprises a layer (19) of a material with a switchable degree of transparency and at least one further switchable layer (17, 21, 23) which, in dependence on the switching state, can assume at least two physical states, the physical states differently influencing at least one optical property of light passing through the switchable layer or reflected by it.