Leading TV channels hardly telecast their
programs in analogue format any more. Most of them have switched
over to the digital format. The quality of sound and the depth and
true to life color reproduction of images in the latter format is
gar better than that of the former. In digital telecasting, the TV
station first converts the signal to digital data before telecasting
it. HDTV pushes the bar further by increasing the number of pixels
per square millimeter. In fact, the qualities of these images are
similar, if not better, than that shown at multiplexes. Since your
normal digital equipment does not possess the electronics to render
the extra pixels, you need to purchase a HDTV (high density TV).
Here are some tips that you should follow while shopping for HDTV.
Go for the highest resolution
HDTVs are available in a wide range of resolutions. Its resolution
determines its picture reproduction abilities. You should go for the
highest definition that your budget allows. You should check the
alphabet (`i' or `p') affixed just after the resolution number. `I'
stands for interlaced and `P' for progressive. In simple language,
the picture gun (the electronic component that transforms the signal
received by the TV into electronic pulses and displays them on the
monitor) of an interlaced TV recreates the image by scanning a
number of lines across the screen. In the progressive method, the
signal addresses each individual pixel with an `on' or `off' command
during the scanning process. You should always go for the `P' option
since it can faithfully display both analogue and digital signals. A
good quality HDTV, reproduces images at 720 line progressive and
1080 line interlaced.
Display -- Plasma, LCD, or LED
You should also check the type of display when shopping for HDTV.
There are three types of displays that you can choose from: Plasma,
LCD (liquid crystal display), and LED (light emitting diode). Always
opt for a screen that contains a layer of anti glare coating. This
prevents reflection of light from other sources from reflecting from
Plasma: The contrast ratio of the display is an important factor
since it provides more depth to the image. Although all types of HDTVs have contrast controls, none of them offer the depth provided
by the plasma TV. The plasma displays also boast excellent
brightness, high resolutions, wide viewing angle, and progressive
display. In simple terms, this means that the pixels on the screen
are lit up simultaneously. Its cons are its inability to reproduce
black colors faithfully, phosphor burn in (if a particular part of
the screen is subjected to a specific nature of display... like as
in a scrolling ticker tape, it results in a ghost image... an image
that is etched on the display permanently).
LCD: Liquid crystal diode displays offer excellent color, amazing
pictures, extremely high resolution, no burn in, and are inherently
progressive (no electronic scanning guns involved). They consume
less power than a plasma display. The drawbacks are poor
reproduction of black color, limited brightness, and viewing angle.
LED: Provides richer & vivid colors, reproduces black color
faithfully, consumes the least power, provides the widest viewing
angle, and is light in weight. It employs light emitting diodes that
have an average lifespan of 100,000 hours. Being a relatively new
technology, it is quite expensive. However, its price will fall once
mass production begins.
These are the main points you should keep in mind when shopping for
HDTV. If you want the best, wait for a couple of months and purchase
a LCD TV.