26 forms a symbol 26 1 for example a letter or a number in the center and right areas however the structured layer 26 is embodied so that flat areas 26 2 and 26 3 for example a frame structure such as the frame structure 11 shown in fig1 is left free the structured layer 26 is imprinted on the transparent operating panel 10 a passivating or protective layer made of a transparent lacquer can be applied to the structured layer 26 an active layer of oleds adjoins the side of the operating panel 10 facing the device an oled 18 1 is arranged below the symbol 26 1 which radiates through the transparent operating panel 10 and thereafter through the symbol 26 1 further oleds 18 2 and 18 3 which are wired together via a bus system and can be individually controlled are arranged underneath the flat areas 26 2 and 26 3 and radiate through them the oleds 18 1 18 2 18 3 radiate light of different colors for example the symbol 24 1 or 26 1 is illuminated in yellow by the oled 18 1 while the flat area 24 2 or 26 2 is illuminated in green by the oled 18 2 and the flat area 24 3 or 26 3 is illuminated in blue by the oled 18 3 the operating panel 10 can be colorless and transparent it is possible to embody the operating panel 10 to be colored and transparent and the oleds 18 1 18 2 18 3 can radiate neutral light.