SolveYourProblem
HDTV Article Series
Buying
a High Definition Television (HDTV)
New
HDTV Screens Are Flat Panel
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.
# # # # #
SolveYourProblem.com : 2007
> Home
> HDTV Articles:
Main Page
|
