I remember folding another LED display, but cannot remember whose. This is a really efficient use of a single 15cm square to make a fully functional LED-style 7-segment digit:

The real skill here is hiding away the colour into flaps arranged symmetrically around the edge of the rectangular piece, so that you can open them out and change what is shown.

This is neat, precise folding – one day I may fold a bunch of them and have them spell out something profound. Neat design, fun fold.