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Now a status symbol among the rich and wealthy, a plasma
TV is a high-definition (HDTV) alternative to the standard
cathode-ray televisions sold today. It gives viewers sharp
images and vibrant colors, particularly when used in
conjunction with high-definition broadcasts. A quality plasma
TV, however, does not come cheap. Its price ranges from
$4,000 to $15,000 plus.
One of the main attractions of a plasma TV is a flat screen,
whichcan be mounted directly on a wall. Manufacturers often
employ surround-sound theater speakers and high-end
receivers to complete the feeling of luxury. No wonder plasma
TVs are such a craze these days.
In terms of science, 'plasma' refers to inert gases like neon
and xenon that glow when in contact with an electrical field.
Televisions usually rely on thousands of small 'picture
elements', abbreviated as pixels. A bundle of three distinct
colors, usually red,green and yellow, constitute one pixel in
a color TV. Properly controlling the level of each color, all of
the other colors of the spectrum can be produced in each
pixel. The distance between the viewer and the screen is
usually such that the individual pixels blur into each other
and the illusion of motion is created as they change color.
Plasma or not, this holds true for any television system.
The individual pixels in a plasma TV are made from three tiny
containers of an inert gas like neon or xenon. There are
thousands of these tiny tubes on an average plasma TV screen.
All of them are sandwiched between two electrically charged
plates. And plasma glows when exposed to an electrical current.
A cable or broadcast antenna dispatches signals to a
computer-processing unit.The antenna instructs the unit how to
reassemble the entire picture hundreds of times per second.
A plasma TV screen contains more pixels than a standard
television, so the image is noticeably sharper. If light
conditions are ambient, a plasma TV will perform at its best.
As flat screens have a viewing angle of 160 degrees, one
can watch TV from almost any position in a room.
Article written by Jason Gluckman.
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