Televisions with plasma display panel (PDP) are much thinner than cathode ray tubes and are usually higher definition. Only a few television use a PDP.
Plasma screens are made of two sheets of glass with two gases stored between the sheets. The gases are xenon and neon and they fill thousands of tiny chambers, or spaces. Behind each space are a series of red, blue and green phosphors that give off light when struck by radiation. When electricity connects to the plasma chambers the colored phosphors produce the right color on your screen. They work in a very similar way to fluorescent lamps used for lighting.
Plasma screens have been in use since 1964 but only two colors could be produced then. Now we have high definition Plasma screens up to 150 inches in size. In the early 21st century fewer plasma screens were made as people bought more liquid crystal displays.

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