Television technology for the past 75 years has been based on the technology of CRT or cathode-ray-tube. In it there are guns that fire beams of electrons, which are particles that are negatively charged inside a tube, made of glass. These electrons cause excitement in phosphor atoms located at the screen end or the end of the tube that is wide. As a result the phosphor atoms gets lighted up. The phosphor coating being lighted up on different areas with various colours with dissimilar intensities produces the image on the screen.
The images are sharp and vibrant but the sets are bulky. Thus a big screen will result in a television set that will take up a good size of the room! With necessity being the mother of invention, this difficulty has led to the popping up of a new technology leading to plasma flat panels for display. These sets have wide screen but are only a few inches thick.
A video signal lights up thousands of dots inside the monitor or television. These dots are known as pixels having highly energized electron beams. Usually pixels have three colours - blue, red and green. These are evenly spread out across the screen. Combining these basic colours in different proportions produces the entire colour show. The fundamental idea of the plasma unit is to light up minute coloured lights that are fluorescent to create the image. Each pixel comprises of three of these lights - red, green and blue. Similar to the CRT, the plasma television alters the intensity of the various lights to bring about the effect of the full spectrum of colours.
The first generation of plasma displays did not have tuners that receive the television signal and interprets that to make a video image. But today digital tuners have been assembled to the main unit.
Plasma is the central element in the fluorescent light. It is a gas that has free flowing ions and electrons. Ions are atoms that have been electrically charged and electrons are particles that have been negatively charged. Normally a gas is made of uncharged particles. Thus a gas atom usually has equal number of protons and electrons atom resulting in zero total charge. But the scene rapidly changes with the introduction of free electrons in the gas. This leads to the setting up across it of electrical voltage.
Free electrons clash with the atoms dislodging other electrons. When an electron goes missing the atom loses its balances. It becomes and ion. In the case of plasma there is electric current passing through. This causes particles that are negatively charged to rush to that region of the plasma that is positively charged; on the reverse the particles, which are positively, charged hurry towards the area that is negatively charged.
There is a mad rush and one collides into another constantly. The gas atoms in the plasma get excited. Photons of energy are now released. The atoms used in plasma displays are neon and xenon atoms. The gases of these are contained in thousands of tiny cells sandwiched between two glass plates.
Thus to sum up we find that the Plasma TV forms a picture from plasma or gas that is filled with atoms of xenon and neon as well as innumerable electrically charged electrons and atoms that bump and collide to release energy or power. The net result is that without extra bulk, the viewing area gets enlarged. Rather than being fat the Plasma TV is slim and thin. The quality of picture is par excellence but the draw back is that the cost is beyond the reach of many people.
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Awhile back, my bro-in-law had recorded a couple of "Combat Report" episodes for me off the History/Discovery Channel, since I don't have cable. The one that I'm trying to locate was about av lone soldier from the U.S. Army Special Forces in Afganistan (?) that set out on a mission to locate, infiltrate, and help destroy enemy weapons and drug caches by placing 'homing beacons' on the spot where they were to be destroyed by means of air srikes, also 'taking out ' a high-level Taliban insurgent in this manner (stealthily placing a homing beacon underneath the Talibani's truck, and calling in an airstrike on the truck itself !)
The story goes on to tell of his escape, where he was injured, and helped by a man hearding his goats............... Can someone please help me with this ? Thanks for a reply.
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what is said at the beginning of the bernie mac show--before the music
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Hello.. I would like to find out the hair color from Loreal superior preference that Evan Langoria is wearing on the latest TV add. It says it's rich like caramel and shinny like bronze. Thank you.
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Are there any sat/cable providers that offer english-language Japanese tv service to the Atlanta, Ga. area? I currently receive the Japan TV network via my Dish Network plan, but is Japanese language only.
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