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There are a variety
of television types that one can choose from with each offering its
Televisions differ according to the type of display technology used.
For example, a Liquid Crystal Display (LCD) can come with either
flat panel or rear projection displays. LCD televisions do not burn
in images like plasma TVs, but they can have ghost effects due to
slow FPS speed. They are also susceptible to a type of pattern known
as the screen door effect when projection is used.
Plasma display panel televisions (PDP) activate gases like xenon and
neon to create images between two plates of glass. The picture
quality of PDPs is unmatched and they are priced in much the same
range as LCD flat panel televisions. The plasma television is
vulnerable to the burn-in effect due to the uneven effect of
phosphors on the screen. Burn-in can be controlled by reducing
contrast, enabling pixel shifting, and by taking other precautionary
Digital Light Processing (DLP) televisions use micro-mirrors to
create digital displays. This technology was invented by Texas
Instruments in 1987. Although they are not susceptible to burn-in,
they do have a problem known as the Rainbow Effect that appears as a
type of flashing of different colours. The Rainbow Effect is caused
by colour wheel spinning. LED and Laser DLPs that do not use a
colour wheel have eliminated the Rainbow Effect.
Tube televisions that use a cathode ray tube represent the original
type of technology used for television viewing. The CRT is good for
viewing from all angles unlike flat panels, which often must be
viewed at a more direct angle for good images. CRTs also have the
best black levels and are economically priced. However, CRTs take up
a lot of space and are heavy. They brightness and radiation of the
CRT display can also be hard on the eyes.
High definition television
Televisions can also be distinguished by the definition of the
images. Although there was some development of analog high
definition TV (HDTV), this was abandoned to pursue digital HDTV
instead. Improvements in digital compression lessened the bandwidth
needs of digital broadcasts making HDTV available to wider
audiences. HDTV is more expensive but it allows for very high
quality viewing including home theatre projection.
Analog vs. Digital TV
Some televisions handle only analog or digital broadcasts, but
increasingly most now can accept both types of broadcasts.
Televisions - probably the largest choice of
Televisions in the UK!
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