3 is designed as a transparent film and is prepared for use in a medical working environment by means of sterilization as a result of the vicinity of the image surface 2 to an operating table 11 contamination of the image surface 2 by bodily fluids or secretions cannot be ruled out the protective element 3 thus also comprises a fluid rejecting surface so as to reduce the ultimately remaining contamination on the protective element 3 by draining the fluid in the case of fluid squirting onto the protective element surface in addition an anti reflecting layer is applied to the side of the protective element 3 facing away from the image surface 2 so as to reduce disturbing reflections of the operating theatre lighting not shown in the region of the image surface 2 of the display facility 1 the protective element 3 is mounted in a dispenser 4 as a film reel roll the dispenser 4 can be fixed here to the display facility 1 on a suitable frame 12 or another suitable fixing option such as a wall by means of traction the protective element 3 can be passed out of the dispenser 4 in front of the image surface 2 this can be carried out manually or with the aid of an electrical drive for instance a fixing facility 5 for the protective element 3 can be positioned for instance on the side of the display facility 1 facing the dispensing facility 4 the options mentioned for the dispenser 4 can be transferred for securing the fixing facility 5 the protective element 3 is stretched in front of the image surface 2 by means of the fixing facility 5 in order to ensure constant examination.