For the past 75 years, the vast majority of televisions
have been built around the same technology: the
cathode ray tube (CRT).
Working: a gun fires a beam of electrons inside a
large glass tube. The electrons excite phosphor
atoms along the wide end of the tube (the screen),
which causes the phosphor atoms to light up.
The television image is produced by lighting up
different areas of the phosphor coating with different
colors at different intensities.
Drawbacks Of CRT:
Produce crisp and vibrant images.
They are bulky.
To increase the screen width in a CRT set, also have to increase the
length of the tube.
Problem of loosing originality of color and proportion.
A new alternative has popped up: the Plasma Flat Panel Display.
A plasma display panel (PDP) is a type of flat panel display
commonly used for large TV displays (typically above 37-inch or
A plasma display panel (PDP) is a display device. Use phenomena
that visible ray is generated from a fluorescent substance when
vacuum ultraviolet ray generated by gas discharge excites the
Plasma display devices can be divided into an AC
type and a DC type in terms of the driving method.
A DC PDP is designed to operate in a direct current
discharge state in which electrodes are exposed to a
discharge space (discharge gas).
An AC PDP is designed to operate in an alternating
current discharge state in which electrodes are covered
with dielectric layers and are not directly exposed to a
Advantages Of AC PDP :
a) offer a higher resolution display.
b) implementing larger display sizes.
c) ease of manufacture
The Plasma display panel was invented by Donald L. Bitzer and H.
Gene Slottow in 1964 for the PLATO Computer System at the
University of Illinois at Urbana-Champaign.
In the late 1980s as semiconductor memory made CRT displays
cheaper than plasma displays.
Plasma's relatively large screen size and thin profile made the displays
attractive for high-profile placement such as lobbies and stock exchanges.
In 1992, Fujitsu introduced the world's first 21-inch (533 mm) full-color
display. It was a hybrid, based upon the plasma display achieving superior
In 1996, Matsushita Electrical Industries (Panasonic) purchased Plasmaco,
its color AC technology, and its American factory.
Pioneer, 1997, started to sale the first Plasma TV to the public.
The largest Plasma display, measured 103" and was made by
Matsushita Electrical Industries (Panasonic), in the world was shown at
the CES (Consumer Electronics Show) in Las Vegas in 2006.
ADVANTAGE OF PDP
Provide high information content and full colour
Produce a very wide screen using extremely thin
The image is very bright and looks good from almost
The high contrast ratios offered make the blacks
blacker and the whites whiter.
The image is inherently sharper, brighter and perfect
from edge to edge.
Plasmas are also free from magnetic interference.
INTRODUCTION TO PLASMA TV
Plasma TV a kind of plasma
display devices employing
the plasma display panel
Plasma TV's create a picture
from a gas (plasma) filled
with xenon and neon atoms
and millions of electrically
charged atoms and electrons,
that collide when the power
Energy from the collision releases, increases the
energy level in the plasma and the neon and xenon release
photons of light.
They offer excellent picture quality, they are quite expensive
and are fast becoming the popular choice for HDTV.
The plasma screen is thinner and lighter than a cathode ray
tube CRT, which has been used as main display means so far,
and can be embodied of high definition and wide screen.
Plasma TVs offer large viewing areas (up to 50 inches) but are
very thin. While they offer excellent picture quality, they are
quite expensive and are fast becoming the popular choice for
The advantages of a plasma TV is no matter how big is the
image, the size, thickness is only 1/6 of the CRT.
The xenon and neon gas in a
plasma television is contained in
hundreds of thousands of tiny cells
positioned between two plates of
Long electrodes are also
sandwiched between the glass
plates, in front of and behind the
The address electrodes sit behind
the cells, along the rear glass plate.
The transparent display
electrodes, which are surrounded
by an insulating dielectric material
and covered by a magnesium
oxide protective layer, are
mounted in front of the cell, along
the front glass plate.
Control circuitry charges the electrodes that
cross paths at a cell, creating a voltage
difference between front and back and
causing the gas to ionize and form a
plasma; as the gas ions rush to the
electrodes and collide, photons are emitted.
In a monochrome plasma panel, the
ionizing state can be maintained by applying
a low-level voltage between all the
horizontal and vertical electrodes
Small amount of nitrogen is added to the
neon to increase hysteresis.
In color panels, the back of each cell is
coated with a phosphor.
Ultraviolet photons emitted by the plasma
excite these phosphors to give off colored
Every pixel is made up of three
separate subpixel cells, each with
different colored phosphors.
Colors blend together to create the
overall color of the pixel.
Varying the pulses of current flowing
through the different cells thousands of
times per second, the control system
can increase or decrease the intensity
of each subpixel color to create billions
of different combinations of red, green
Control system can produce most of the
CONTRAST RATIO CLAIMS
Contrast ratio is the difference
between the brightest and darkest
parts of an image, measured in
discrete steps, at any given moment.
The higher the contrast ratio, the
more realistic the image is.
Contrast ratios for plasma
displays are often advertised as
high as 20,000:1.
This is a significant advantage of
plasma over other display
Manufacturers follow either the ANSI
standard or perform a full-on-full-
The ANSI standard uses a checkered test pattern
whereby the darkest blacks and the lightest whites are
simultaneously measured, yielding the most accurate
A full-on-full-off test measures the ratio using a pure
black screen and a pure white screen.
Manufacturers can further artificially improve the
reported contrast ratio by increasing the contrast and
brightness settings to achieve the highest test values.
Plasma is often cited as having better black levels (and
Each cell on a plasma display has to be precharged
before it is due to be illuminated (otherwise the cell would
not respond quickly enough) and this precharging means
the cells cannot achieve a true black.
Running a display at maximum brightness will
significantly reduce the panel's lifespan .
ADVANTAGE OF PLASMA TV
Plasma TVs offer many advantages over other television
Exceptional Color: Plasma TVs display up to 16.77
High Resolution: Plasma TVs are able to display a high
resolution, and are capable of displaying HDTV signals.
Widescreen Aspect Ratio: Plasma TVs offer a dramatic
widescreen 16:9 ratio display.
Flat Screens: Plasma TVs offer perfectly flat screens,
cutting down on image distortion and glare.
Magnetic Field Immunity.
Slim, Lightweight Design.
Uniform Screen Brightness.
DISADVANTAGE OF PLASMA TV
Of course, not all technologies are perfect,
and Plasma TVs do have some disadvantages
compared to other TV technologies:
Shorter Life: Compared to other television
technologies, Plasma TVs do generally have a
shorter life span, and there is no option to
repair a burnt out tube or backlight.
Fragility: Plasma TVs are a very fragile
technology, and the units are quite easy to
Not the Lightest or Slimmest.
SIZE OF PLASMA TV
The majority of plasma TV's and big screen televisions are
manufactured in the widescreen 16:9 aspect ratio.
Plasma televisions come in a number of different sizes and
like all televisions, plasma monitors are measured
diagonally across the screen.
Plasma television screens start as small as 5 inches and
increase in size up to 63 inches or larger.
The typical sizes are 24 inches, 32 inches, 40 inches, 50
inches and around 60 inches. The most popular plasma
television screen sizes are 32 inches and 61 inches.
The larger plasma television screen, the heavier it will be
and the harder it will be to mount.
Sitting within close proximity of the screen, , say six to
ten feet away, then best choice would be a medium
sized monitor of 32 or 36 inches.
The best picture quality will come from a 42 inch
plasma screen television ; at least ten feet away from
For the really big picture and to fully appreciate the
quality of a Plasma screen, need to be at least fifteen
Worlds Largest Plasma Television
Panasonic, one of the
most reputable and top
manufacturers of television
sets, announced they will
sell the worlds largest
plasma television set
available on the market
At one hundred and
three inches, this flat
screen option is currently
the largest plasma
television available. It has
a SRP of $69,999.95.
The largest plasma television screen comes
with high definition technology capability
which will allow for an even more life like
experience when viewing television.
When watching movies or sporting events,
can feel like we are right there in the action.
This is an exciting way to watch television
and will greatly enhance the experience.
There are other manufacturers that
produced large screen plasma television
sets. Both LG and Samsung produced a
one hundred and two inch screen but
with Panasonic's one hundred and three,
they were out classed and Panasonic takes
the prize for the largest plasma television
screen to date.
Where To Buy Plasma TVs
Generally, the cheapest prices on Plasma TVs can be
found through online retailers.
Few things should be kept in mind:
Shipping and other hidden costs: Be careful of great
TV prices that have extraordinarily high shipping and
handling costs, or other hidden costs like charging a
few hundred dollars for a stand that is included
standard with the TV.
Unauthorized dealers: Most Plasma TV
manufacturers have authorized dealers that they sell
through. Some online retailers are not authorized -
they may have better prices in some cases.
Great prices on auctions sites: Be very careful if you
are planning to purchase a TV through an auction site.
Prices to good to be true.
The great competitor of the Plasma TV
is LCD TV.
Plasma TV versus LCD TV:
Both Plasma and LCD TV technologies
are advancing rapidly, and prices have
fallen dramatically since both were
introduced. Both definitely represent two
of the best new television technologies
and generally offer excellent picture
Following Plasma vs. LCD overview: