Big Tv's: The History And Technology Of Led Big Screens

Typically, the bigger the screen, the dimmer the picture when attempting to display video. This is why movie theaters turn down the lights before playing a movie. With the lights on, the image on the giant screen is so dim that it would be difficult to see any of it.

But lately you've probably seen lots of giant TV screens at places such as sporting events, concerts, and other venues where video is played outdoors in the middle of the day. And yet the image is bright enough for everybody to see without any problems.

How are they able to accomplish this? The secret ingredient is the LED, or light-emitting diode.

The LED can be traced all the way back to 1907 when the ability to cause a diode to give off light was first known to be discovered. However, the discoverer was not able to continue research on the matter, as he was called to serve during World War I as an intelligence officer.

During the 1920's, Russian scientist Oleg Vladimirovich Losev built the first LED. However, his discovery was ignored by the scientific world and very little development was seen in the field for decades to come.

It wasn't until 1961 that a patent was issued for an LED, but it turned out to emit only infrared radiation; not visible by humans. But 1962 saw Nick Holonyak, an engineer at General Electric, develop the first practical light-emitting diode that gave off light in the visible spectrum. Ten years later a former student of Honyak's would build on his work by inventing diodes that produced much brighter light.

The ability to produce bright light at such low wattage would become key in the development of large LED screens that could display clear video without having to dim the lights or be used strictly indoors or at night.

Increasing power requirements for brighter light-emitting diodes has required technologies such as heat sinks to disperse the heat generated by the thousands of individual diodes used in a typical LED big screen. Diode size also plays a role in being able to create a crisp image. Each diode is, essentially, a pixel. The smaller the diode, the higher the resolution, the cleaner the image that is produced.

Light-emitting diode technology continues to advance at a rapid pace, resulting in LED screens being used more and more often as their use becomes more practical with every technological advancement. Who knows? One day you might attend your local movie theater and watch a big screen with the lights on.

About the Author:
Video WallTronics (http://www.rentbigscreens.com) rents and sells large LED screens for use at your next grand event. Art Gib is a freelance writer.

Article Originally Published On: http://www.articlesnatch.com

Tags: LED screens

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