The invention relates to a display device (1; 101) comprising a plurality of picture elements (2; 102) for displaying still and moving images, alphanumeric characters or the like. According to the invention, said picture elements can be controlled, either individually or in groups, by means of an electronic control System, and the display device (1; 101) comprises a first flat Substrate (3; 103). The invention is characterised in that the first flat Substrate (3; 103) comprises fastening elements (5; 105) which project, at least in sections, from the first surface (4; 104) thereof, in order to detachably fix the display device (1; 101) to a carrier device (7), by the co-operation of the fastening elements (5; 105) of the first flat Substrate (3; 103) with the carrier device (7).