SignIndustry.com electronic sign
 

 

 

Plugs permitted an electronic sign to be illuminated by light shining onto it, but the real revolution occurred when light bulbs were used to form images and words. Light bulbs flashing on and off made new demands on the attention of passersby. Light bulbs blinking in sequence could also simulate movement. Add this property to the mix, and a dramatic transformation of American streets resulted. As soon as the sun goes down the electronic sign pops on. Many of these have special sensor features that automatically turn themselves on. Wow Thomas Edison would be impressed today. Every fast food restaurant has an outside electronic sign. Many of them even illuminate their menu boards for clarity.