Does a led lighted display board qualify for this thread?
If so, I ve seen a specification of led boards that is 2m(W) x 5m(H) and have about 4500 pieces of led / Meter sq.
Bet you wouldnt want to carry around a display board during a hike :laughing:
infinity is the word.... nano technology will get so advance that maybe someday you will have something with the 5mm led's power for 1/100 of the size...who knows only time can tell...