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Knocked Flat with the new HDTV Screens
Many HDTV screens are now available in a flat construction, making them much
thinner, more lightweight and have the added advantage of taking up less space.
Often a flat screen television (also referred to as a flat-panel TV) can easily
be mounted on a wall of your choice. Flat screen televisions present very
bright, clear images and are made by way of either plasma or LCD (Liquid Crystal
Display).
The technology used to develop a plasma television centers around the idea of
something very simple, that of a fluorescent light bulb. Cells make up the
display of the plasma TV and within each cell there are two panels made of
glass, which are themselves separated by a narrow gap. It is by way of this gap
that a gas known as neon-xenon is injected and then afterwards sealed in plasma
form. During the process of manufacturing when the plasma is in use, the gas is
then electrically charged at specifically timed intervals. Precision and timing
is an extremely vital part of the entire process. The charged gas in the
television comes into contact with three different colored phosphors (blue, red
and green) and it is this action that produces the television image we see when
we look at the screen. Every group of blue, red and green phosphors forms the
picture element or to use the more technological term, a pixel.
LCD (Liquid Crystal Display) is not a new technology by any means. For many
years it has been used to make digital watches, calculators, cell phones,
computer monitors and camcorders. The panels used in an LCD device (which is
also referred to as a cell) are constructed with two layers of a fine material
very much resembling glass. This material is known as substrates. The layers are
polarized and then affixed together (sandwiched). A special polymer is used to
cover one of the layers, but not both, and it is this layer that is responsible
for holding the liquid crystals (or rod-shaped molecules) together that make up
the LCD television set. What then proceeds to take place is that currents of
electricity make their way through the individual crystals and it is the
crystals alone that allow light to either pass through or block the image that
the television puts forth. A light source external to the crystals is imperative
for a LCD monitor to work properly as the crystals are not capable of making
their own light source. This where the LCD and plasma televisions are similar, a
fluorescent bulb is also needed to allow the television watcher to see the
picture on the screen.
Flat-panel HDTV screens have many advantages which include the construction of
these sets being shallow, deep and incredibly lightweight; both plasma and LCD
televisions have digital display precision; both HDTV types have immunity to
picture distortion of the magnetic kind and finally perfectly flat screens equal
perfect focusing of images and geometry.
Flat-panel HDTV screens allow an individual many options in where to place the
sets as these kind are more "user and mover friendly" because they are shallow
television sets with lots of depth and are very lightweight. In order to
conserve space many people choose to mount their HDTV flat-panel screen on a
wall while others choose to place it on an entertainment center, table, cabinet,
bookshelf or bureau. Plasma televisions do weigh slightly more than LCD screens
but it's nothing compared to the heaviness of a traditional picture tube (or
CRT) set.
Both LCD as well as plasma televisions are what are classed as digital displays.
What that means is that images are generated by the illumination of a fixed grid
of small sized pixels. Every pixel is divided into three sub-pixels each one
consisting of the colors green, red and blue. It is at the sub-pixel level of
the television that the precision side of things takes over. Both the color and
brightness of the screen is controlled very precisely at this unique level,
giving rise to millions (and some estimate even billions) of color combinations.
Have you ever positioned a speaker at a distance too close for comfort to your
conventional television and took notice of the fact that a particular area of
the screen had become discolored and kind of strange? Well that phenomenon is
known as magnetic distortion and thankfully with the advance in technology both
LCD and plasma televisions are not affected whatsoever by the close proximity of
magnets that exist inside a loudspeaker.
Finally, a perfectly flat HDTV screen means so much more than that. Flat screen
televisions have an image focus that is right on and as perfect as is
technologically possible for them to be. As well the geometry of these sets,
looking at them from top to bottom also from side to side and lastly, corner to
corner is perfect. Straight lines are meant to look stick straight and they do
indeed on these flat HDTV screens.
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