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01Apr

The Plazma Television Essay

Posted by admin as Example papers

Example Essay on The Plazma Television

I would like to start by saying that over the past 70 years the televisions were built using the same technology, i.e. the cathode ray tube (CRT). This CRT technology, the electron gun would fire a beam of electrons onto the luminescent-coated screen. The phosphorous material after being hit by the electrons would light up and make a picture. The different amount of electrons and their intensity would light up different areas of the television differently and thus would produce a picture. The CRT television would produce bright and crisp images, yet still are not free of drawbacks with bulkiness being one of them. Thus, in order to have a large television, one would have to also increase the length of the tube though which the electrons have to travel to hit the screen. Thus a common Home Cinema® TVs if using the CRT technology would weight as much as a car and take up half a room if not more (Goodman, 45).

The plasma flat panel display, on the other hand has a very thin screen (6 to 7 inches) regardless of its size. The plasma flat panel display would use a different technology that would light up thousands of different small dots that comprise the screen and are called pixels. Usually there are three colors of pixels (red, green and blue), each of them being equally represented on the screen. By lighting up different pixels on the screen, it is possible to create images. plasma flat panel display technology uses small colored fluorescent lights that form the general image. Each pixel of the plasma flat panel display is made up of three sub-pixels (red, green and blue) each of them can light at different intensities (Adams, 58).

Plasma flat panel display gets its name from the plasma gas that fills up individual fluorescent lights of the TV, which is made up of free-flowing positively-charged ions and negatively charged electrons. Under normal conditions, when the TV is turned off, the gas would bear natural charge. Each of the gas atoms would then possess the equal amount of negatively and positively charged ions and thus remain passive. This plasma gas has the property of lighting up or changing color whenever the charge is not neutral. Thus when we turn on the plasma TV many free negatively charged electrons would enter the gas via the sophisticated electrical wiring and voltage across the screen and change the charge of the plasma gas. The plasma ions would then get the positive charge because the electrons would knock loose other electrons which would deprive the neutral atom of one negative change, thus leaving it positively charged. Yet in order to get to the equilibrium the negative particles would then rush to the positive particles, while the positive particles would rush to the negative particles (Goodman, 49).

During such chaotic electron movement the negatively and positively charged particles would collapse and bump into each other. During such collision, the plasma gas atoms would then release photons (the particles that make up light), which creates the light in each of the pixel element.

Plasma flat panel display uses Xenon and neon gas atoms, the atoms that release the most light photons when they are excited by the electric current. One should remember that usually the atoms release ultraviolet light photons that create the light invisible to the human eye. Yet these photons then used to hit and excite the visible light photons thus making the plasma flat panel display create some visible light (Adams, 61).

Speaking about the inner structure of the plasma flat panel display, I would like to note that xeon and neon gases are used in thousands if not millions of identical small cells which are positioned between the two thin glass layers that form the TV display. One should remember that there are hundreds of long and thin electrons placed between the glass plates touching the plasma gases on both sides of the individual pixels. The display electrodes of the plasma flat panel display are transparent and are surrounded by insulating dielectric material and usually covered by the protective layer of copper or magnesium oxide to improve the performance of the display.

The electrons of the plasma flat panel display are stretched across the entire plasma screen in order to reach every possible pixel. The display and address electrons of the plasma flat panel display are then placed in horizontal and vertical rows so that a proper electronic grid is formed on the panel.

I will add here that in order to ionize the neon or xeon gas in a particular cell of the plasma flat panel display, the plasma display’s computer then would charge the electrodes that intersect at that particular pixel cell making glow and produce a part of the picture. Then the computer directs the electrodes to charge each individual cell of the plasma flat panel display in a well defined and consequential turn, making the display produce the light of different intensity and color that would then make up a general television picture available for the user (Goodman, 53).

It is of importance to note that whenever the intersecting electrodes of the plasma flat panel display are charged (with a voltage difference specified by the computer), an electric current would then flow through the neon-xeon gas in the particular cell. As noted earlier, such electric current would contribute to the massive collapses of bumps of the electrons and protons, releasing ultraviolet photons (Adams, 63).

The released ultraviolet photon that creates the invisible light would then interact with the phosphor material that covers the inner side of the pixel cell. The special phosphorous substance would then emit the light in the visible light specter and would thus create the light that would make up the television picture visible for the human eye. On a more physical level the whole process is about the electrons hitting the atoms that would heat up and then cause the electrons fall to their previous level while at the same time releaseing the energy in the form of a normal light (Goodman, 57).

I should also add here that the plasma flat panel display and the phospors would only give up light when the electrons are excited. As noted earlier each pixes of the plasma flat panel display is made up of 3 colorful subpixels (red, green, blue) each of them having the phosphor of the corresponding color. When mixing together these three colors would then create the needed color or picture on our plasma flat panel display (Briere, 172).

One should not forget that once the pulse, the frequency and the voltage of the current that passes through the numerous cells of the plasma flat panel display, the computerized control of the plasma TV would then manipulate the color intensity by manipulating the infinite combinations of red, blue and green phosphor lights. This is the way that allows the plasma TV to cover incalculable amount of colors.

Speaking about the advantages of the plasma flat panel display or the plasma TV, I would like to note the following:
1. Wide and very thin screens.
2. Bright images, that look good at any angle unlike the competing LCD monitor. Every pixel is lit up individually and thus presents a clear view (Myers, 84).
3. plasma flat panel displays are not heavy compared to the CRT technology used in ‘classical’ TVs across the land.

Speaking about the negatives of the plasma flat panel display, I would like to ntoe that it is probably the only one: the high price. The prices for the plasma TVs start at about $3500 and go up to $20,000 making the plasma flat panel display affordable for a limited number of people (Briere, 175). Yet as the prices go down, these TVs are able to compete with the conventional TVs (CRT technology).

In conclusion I would like to note that the plasma flat panel display is a truly new revolutionary technology and allows to create a nice quality image using light and thin screens. Plasma TVs use a sophisticate combination of gas filling and phosphorous material covering the sub pixels and the electrons to ignite light in these tiny pixel compartments. Plasma flat panel displays have the only true disadvantage of price being too high at the moment.

Bibliography:
Goodman, Robert, How Electronic Things Work… And What to do When They Don’t, McGraw Hill, 2002.
Briere, Danny, Home Theater for Dummies, Prentice hall, 2001.
Muraoka, Katsunori, Laser Aided Diagnostics of Gases and Plasmas, NY Random House, 2002.
Myers, Robert, Display Interfaces: Fundamentals & Standards, Penguin books, 2002.
Adams, John, Build Your Own Home Theater (Second Edition), Wiley Press, 2001.

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