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Television Technologies: Plasma, LED, LCD and 3D

If you are currently looking to rent a plasma television, or buy one, you might want to read further to understand what it is that you are shopping for, and why you might find it to be superior to a traditional set. Over the past three-quarters of a century, most televisions have been built using the same old technology; a cathode ray tube, or CRT. In such a model, a device fires a beam of negatively charged particles (electrons) inside a large tube. Those electrons then agitate phosphor atoms positioned along the wide end of the tube, or the screen, causing them to illuminate. The image on the television screen is produced by illuminating different areas of the phosphor coating at different intensities with different colors.

CRTs may produce clear colorful images, but their major drawback is that they are just plain big. They take up a lot of space. If you want to make a CRT television screen larger, you need to make the tube even larger so that the firing device can reach the entire thing. Therefore, it is practically impossible to have a large-screen CRT television that leaves enough space in the room for viewers.

That is why plasma flat panel televisions became so popular. Plasma televisions have large screens, comparable to even the largest CRT models, but at a fraction of the thickness (about six inches or 15 centimeters). Plasma televisions use information in a video signal to light up thousands of tiny dots (or pixels) with a high-energy beam of electrons. samsung led tv 32 inch full hd

Most plasma screens have three colors of pixels evenly distributed on the inner surface: red, green and blue. On a plasma screen, the pixels are illuminated to form the image that the viewer sees. The television is able to produce any other color through combining those three in different ways, and by varying the intensities of the illuminating lights.

These new televisions get their name from the main element in their fluorescent lights: plasma. Plasma is a gas made up of free-flowing ions (electrically charged atoms) and electrons (negatively charged particles). When the plasma set is turned on, electrical current runs through it, so the electrons are rushing towards the positively charged areas of plasma, and protons in the plasma rush towards the negatively charged areas. Constant collision between the two excites the plasma, causing them to release light photons; the colors that you eventually see on your screen.

Inside a plasma television, xenon and neon gases are contained in literally hundreds of thousands of small cells squeezed between long electrodes, which are in turn squeezed between two glass plates. Address electrodes are arranged vertically and make up the back layer, and transparent display electrodes are arranged horizontally along the front. Together they form a basic grid.

The plasma display computer charges the electrodes that intersect particular cells so as to ionize them. This happens thousands upon thousands of times within a single second. The resulting electric current causes charged particles to flow rapidly and make the gas atoms release ultraviolet photons. Those photons in turn interact with phosphor material coated on the inside wall of the cell. The resulting reaction causes the phosphors in the plasma display to give off colored lights; the three colors that we described earlier. The variations in the pulses of current flowing through the electrodes and cells causes hundreds of different combinations of the three colors, and is thus able to replicate the entire color spectrum.

 

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