A secure display system comprises one or more closure devices having non-transparent polycarbonate projection panels, one or more projectors, and a PC for providing both security and advertising capabilities. The secure display system can display publicly viewable information by projecting images containing, for example, text, graphics, and video from the inside through the projection panels, thus creating an externally viewable display while securing the premises. In some embodiments, the closure device can include a plurality of projection panels in the form of a security roll down shutter. Transparent viewing panels can also be included adjacent the projection panels to provide both viewing and projecting capabilities.