How does plasma display work?

Answer 1

How a Plasma TV Works

Plasma TVs use small chambers of a plasma (gas) to illuminate adjacent areas of phosphors of different colors.

Plasma TVs use thousands of sealed, low pressure glass chambers filled with a mixture of neon and xenon. Behind these chambers are colored phosphors, one red, one blue, and one green for each chamber. When energized, these chambers of "plasma" emit invisible UV light. The UV light strikes the red, green and blue phosphors on the back glass of the display making them produce visible light.

Answer 2

When plasma is used, the blood is too thin, and the "victim" has a deadly cut. If the blood is too thin, it causes more bleeding. Plasma thickins the blood until the doctors can completely stop the flow. This is a sort of "replacement blood", if you may.

Answer 3

The xenon and neon gas in a plasma television is contained in hundreds of thousands of tiny cells positioned between two plates of glass. Long electrodes are also sandwiched between the glass plates, in front of and behind the cells. The address electrodes sit behind the cells, along the rear glass plate. The transparent display electrodes, which are surrounded by an insulating dielectric material and covered by a magnesium oxide protective layer, are mounted in front of the cell, along the front glass plate. Control circuitry charges the electrodes that cross paths at a cell, creating a voltage difference between front and back and causing the gas to ionize and form a plasma. As the gas ions rush to the electrodes and collide, photons are emitted.

Answer 4

Inside a Plasma unit sit hundreds and thousands of tiny pixels which are cells filled with a mixture of neon and xenon gasses. These cells are sandwiched between two glass panels running parallel to each other. A single pixel is made up of three coloured sub-pixels, one subpixel has a red light phosphor, one has a green light phosphor and the third has a blue light phosphor. A plasma screen works by controlling each individual phosphor. Each phosphor is driven by its own electrode, which activates tiny pockets of gas between the front sheet of glass and the phosphor-coated rear panel which stimulates the gas to release ultraviolet light photons, which are invisible to the human eye. The released ultraviolet photons interact with phosphor material coated on the inside wall of the cell. Phosphors are substances that give off light when they are exposed to other light eg. Ultraviolet light. The phosphors in a pixel give off coloured light when they are charged. The cells are situated in a grid like structure, the plasma display's computer charges the electrodes that intersect at that cell. It does this thousands of times a second, charging each cell, which effectively turns the pixel on and off to allow the creation of movement and colour change on the screen. The varying intensity of the current can create millions of different combinations of red, green and blue across the entire spectrum of colour.

Answer 5

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 electrons (negatively charged particles). Under normal conditions, 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 atom's nucleus) and electrons. The negatively charged electrons 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 an 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 its 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. (For details on this process, see How Fluorescent Lamps Work.) 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. But ultraviolet photons can be used to excite visible light photons, as we'll see in the next section. ­The xenon and neon gas in a plasma television is contained in hundreds of thousands of tiny cells positioned between two plates of glass. Long electrodes are also sandwiched between the glass plates, on both sides of the cells. The address electrodes sit behind the cells, along the rear glass plate. The transparent display electrodes, which are surrounded by an insulating dielectric material and covered by a magnesium oxide protective layer, are mounted above the cell, along the front glass plate. Both sets of electrodes extend across the entire screen. The display electrodes are arranged in horizontal rows along the screen and the address electrodes are arranged in vertical columns. As you can see in the diagram below, the vertical and horizontal electrodes form a basic grid.

To ionize the gas in a particular cell, the plasma display's computer charges the electrodes that intersect at that cell. It does this thousands of times in a small fraction of a second, charging each cell in turn.

When the intersecting electrodes are charged (with a voltage difference between them), an electric current flows through the gas in the cell. As we saw in the last section, the current creates a rapid flow of charged particles, which stimulates the gas atoms to release ultraviolet photons. The released ultraviolet photons interact with phosphor material coated on the inside wall of the cell. Phosphors are substances that give off light when they are exposed to other light. When an ultraviolet photon hits a phosphor atom in the cell, one of the phosphor's electrons jumps to a higher energy level and the atom heats up. When the electron falls back to its normal level, it releases energy in the form of a visible light photon. The phosphors in a plasma display give off colored light when they are excited. Every pixel is made up of three separate subpixel cells, each with different colored phosphors. One subpixel has a red light phosphor, one subpixel has a green light phosphor and one subpixel has a blue light phosphor. These colors blend together to create the overall color of the pixel. By varying the pulses of current flowing through the different cells, the control system can increase or decrease the intensity of each subpixel color to create hundreds of different combinations of red, green and blue. In this way, the control system can produce colors across the entire spectrum. The main advantage of plasma display technology is that you can produce a very wide screen using extremely thin materials. And because each pixel is lit individually, the image is very bright and looks good from almost every angle. The image quality isn't quite up to the standards of the best cathode ray tube sets, but it certainly meets most people's expectations. The biggest drawback of this technology has been the price. However, falling prices and advances in technology mean that the plasma display may soon edge out the old CRT sets. To learn more about plasma displays, as well as other television technologies, check out the links on the next page.

Answer 6

Well its all to do with the Chemistry. Plasma televisions are large flat-panel displays. The screen consists of hundred of thousands of tiny cells. Each cell holds an inert mixture of the noble gases neon and xenon between two plates of glass. The formation of these ions requires energy. The mixture of positive ions and negative electrons is called a plasma. The presence of the plasma causes the screen to emit light and hence has the ability to produce pictures.

Answer 7

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Answer 8

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