Abstract: A display sign mounting system allows quick and easy mounting and tensioning of a display sign. The display sign has a substantially planar surface to which support members are mounted to form a perimeter frame. Bracket assemblies are attached to the support members. The bracket assemblies retain the substrate and allow for selective tensioning of the substrate to create a taut display as desired. A bracket assembly may have rotatable members to facilitate installation of the substrate. The substrate is wound on a spool assembly to facilitate transporting the substrate to and from a display sign location.