Plasma Displays
Up until the past couple of years, most televisions have been built around the same technology. This technology is the cathode ray tube. In CRT televisions, a gun fires a beam of electrons into a large glass tube. The electrons send phosphor atoms to an excited state that causes them to light up. They have good images, but they also have one big problem. They take up a lot of space and are very heavy. Now scientists wanted to find a better way to fit a big television in a small room. They came up with the plasma flat panel display. They still come in large sizes, but are only about six inches thick. Plasma televisions illuminate tiny colored fluorescent lights to form an image. Each pixel is made up of three fluorescent lights. A red, green, and blue light. The plasma display varies the intensities of the different lights to produce a full range of colors like the CRT televisions.
Plasma is a gas made up of free flowing ions. While they are all rushing around, particles are constantly colliding with each other. Phosphors give off light when they are exposed to other light. When an atom loses an electron, it gets a positive charge and becomes an ion. The image can be very bright and look good from any angle because each pixel is lit individually. When it drops back to its normal state, it gives off a small amount of energy. An electric current flows through the gas in the cell when the intersecting electrodes are charged. It does this thousands of times in a fraction of a second, charging the cell. The main advantage of the plasma display technology is that you can produce a very wide screen using very thin materials. When free electrons are put into the gas, there is an electrical voltage established. The main drawback to the plasma displays is the price. The types of atoms used in plasma televisions are xenon and neon. By blending red, green, and blue together in different ways, the television can produce any color. The gases in plasma televisions are contained by tiny cells between two plates of glass.
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