Television's contrast ratio represents its ability to show detail in high contrast areas of the screen, in the form of minute gradations of color and blacks or whites.

1. PRESENTATION
Topic:Lcd,led and plasma
Prepared By : Sudip Vora

2. Contrast ratio
o A television's contrast ratio represents its ability to
show detail in high contrast areas of the screen, in
the form of minute gradations of colour and blacks
or whites.
o It is generally accepted that plasma televisions have
better contrast ratios than LCD panels, due to the
fact that a plasma television can completely
deactivate the light source for individual segments
of the screen. This means sections of the screen can
be completely dark while others are displaying
bright colour, unlike a traditional LCD screen which
has a single backlight array that can only alter
brightness levels for the entire screen.

3. To be continue….
 The latest LED backlight technology allows the
television to individually control backlight segments.
This technology allows for contrast ratios similar to
those produced by plasma television panels.

4. Viewing angle
 plasmas have better viewing angles than LCD and
LED TVs, with their images remaining solid and
colourful at wide viewing angles.
 while LCDs suffer from colour shift and loss of
brightness. This is not always the case.
 LED televisions have superior viewing angles
compared to LCDs due to their decentralised
backlight distribution.

5. color
 Colour is an aspect that is largely independent of the
television's type, relying on the processing
technology independent to each manufacturer and
specific screen model.
 it is important to note that plasma televisions can in
theory produce brighter colours overall.
 LED-lit televisions using either a white or RGB LED
backlight also offer a larger colour gamut than
traditional LCD screens, due to an improved
brightness source.

6. Motion
 There is much discussion as to whether plasma or
LCD screens are better at handling fast motion.
 New LCD screens can now update the image
displayed 100 times per second
 plasma TVs are still superior in handling fast motion,
but the motion-handling of LCD TVs has improved
greatly over the last five years.
 LED televisions use the same motion processing
technology as LCD panels, with all panels currently
on the market using 100Hz refresh rates. As LED
televisions are leading the market in technological
innovations

7. Power
 Most LCD televisions require a single fluorescent
backlight to be lit.
 Plasma televisions, on the other hand, require every
sub-pixel to be lit in plasma individually. When you
compare screens of equal size televisions consume
more power than their LCD counterparts.
 LED television screens offer significant power
savings over both LCD and plasma televisions.
 Energy-efficient backlighting allows LED televisions
to have energy consumption of up to 40 percent less
than LCD televisions and significantly less than a
plasma.

8. Life span
 In the past, plasma panels suffered from a short life-
span before they lost significant amounts of bright-
ness and image quality degraded. This has been
overcome in recent plasma generations, their screens
with a half-life of 60,000 hours.
 The life of LCD tv depends on the life of its
backlighting bulb. These bulbs are often rated to
above 60,000 hours in regular fluorescent-lit LCD
panels.
 new LED-backlit televisions have expected
lifespans of over 100,000 hours. It is important to
note that the end of this lifespan does not necessarily
mean the screen will stop working.

9. Price vs screen size
 More than any other determining factor, it is
tempting to simply pick the cheaper of either a
plasma or LCD television when considering any
given size.
 Contrast and brightness shortcomings are less
apparent in smaller screen sizes, while you will also
generally find LCD screens below 42in have a higher
resolution than their plasma equivalents.
 considering a large screen — 42in and above — as
your home theatre centrepiece, be sure to check out
plasma technology.

10. To be continue.....
 Plasma panels do have the edge in terms of contrast and
overall picture quality at these sizes, and are often
cheaper than an equally-sized LCD counterpart.
 LED televisions are generally available in similar sizes to
LCD televisions, with larger screens also available in
premium models
 LED televisions generally command a price 20 per cent
above that of an LCD television featuring an identical
screen size and similar specifications.
 LED televisions’ power-saving advantages make them
attractive prospect for long-term use.

11. Thank you!