­ Q: What did a zoetrope do for the film industry? A: The zoetrope, invented by William George Horner in 1834, consisted of a series of pictures on a paper strip arranged on the inside of a revolving drum. The drum had small slits you could look through to see the pictures.

­If you have ever been to a sporting event that has a large-screen TV in the stadium, then you have witnessed the gigantic and amazing displays that make the games so much easier to follow. On the TV, they can display instant replays, close-ups and player profiles. You also see these large-screen TVs at race tracks, concerts and in large public areas like Times Square in New York City.

Have you ever wondered how they can create a television that is 30 or 60 feet (10 to 20 meters) high? In this article, we will take a look at the LED technology that makes these huge displays possible!