How a Plasma Screen Works
Posted: Monday, May 14, 2007
by Dougal Kay
http://www.searchbyte.co.uk
How does a plasma screen work?
The plasma screen television is a relatively new development. It used to be the case that we didn't have much choice when it comes to the humble television.
The CRT screen was the only option. This tube arrangement limited the size and the viewing angle of the TV.
This all changed in 1964 when the first prototype of the plasma screen television came to life, the main reason for the delay being the lack of readily available digital components.
What does that mean??
A Xenon and Neon gas mixture is contained in a glass envelope between two sheets of glass, the gas mixture being the plasma and the envelope being a pixel. An electrical current is passed through the plasma, that becomes excited. The excited ions collide with each other and produce rays of ultraviolet light. The ultra violet light reacts with the phosphor that is coating each pixel, just like in a fluorescent tube light.
Different colors are produced by varying the current flowing through each envelope.
Each pixel contains three sub pixels, a red, blue and a green one. Each sub pixel is controlled separately, meaning that each one can generate over ten million colors.
The advantages of the Plasma screen over CRT screens.
1. A consistently much brighter, sharper and crisper image.
2. Very thin construction often allows a much smaller mounting area.
3. Plasma screens have a much wider viewing angle.
4. Glare is very minimal and even direct sunlight does not completely wash the picture away.
5. Almost seventeen million colors can be displayed.
The CRT screen is far from dead and buried but one cant help thinking that its days are numbered. Plasma screen televisions are getting cheaper by the year and it is easy to see why they are dominating.
Steven owns and runs an online store that sells standard Televisions as well as liquid crystal displays and Plasma screens.
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