Plasma Display

Plasma display


Defination of Plasma Display :

A Plasma TV Display uses hundreds-of-thousands of miniature,embedded cells to produce a picture. Each cell equals one pixel, (picture element )
And has three sub-cells. The three sub-cells are filled with a plasma gas which will ‘glow’
Red, blue or green (depending on the phosphor coating) when charged electrically.Light from the three “RGB” sub-cells combines to form a one colored pixels on the screen.

A Plasma Display is an emissive flat panel display where light is created by phosphors excited by a plasma discharge between two flat panels of glass.The gas discharge contains no mercury (contrary to the backlights of an AMLCD) a mixture of noble gases (neon and xenon) is used instead. This gas mixture is inert and entirely non-harmful.



What is Plasma ?

The Central element in a fluorescent light is a plasma, a gas
Made up of free-flowing ions (electrically charged atoms) and electons (negatively charged particles). Under normal condition, a gas is mainly made up of uncharged particles. That is,
the individual gas atoms include equal numbers of protons (positively charged particles in the
atoms’s nucleus) and electron. The negatively charged electron perfectly balance the positively
charged protons, so the atom has a net charge of zero.

If you introduce many free electrons into the gas by establishing on electrical voltage across it, the situation changes very quickly. The free electrons collide with the atoms, knocking loose other electrons. With a missing electron, an atom loses it’s balance. It has a net positive charge, making it an ion.

In a plasma with an electrical current running through it
negatively charged particles are rushing toward the positively charged area of the plasma, and positively charged particles are rushing toward the negatively charged area. In this mad rush, particles are constantly bumping into each other. These collisions excite the gas atoms in the plasma, causing them to release photons of energy.

Xenon and neon atoms, the atoms used in plasma screens, release light photons when they are excited. Mostly, these atoms release ultraviolet light photons, which are invisible to the human eye.