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PLASMA DISPLAY: A Distortion-Free Image:

The advent of HDTV, DTV, SDTV, DVD, and other new media have created a demand for larger, higher-resolution displays. New plasma display technologies demonstrate inherent engineering advantages over conventional CRTs (Cathode Ray Tubes) and LCD (Liquid Crystal Display) panels.

Comparison: CRT vs Plasma Display Panel

Cathode Ray Tube (CRT) Plasma Display Panel (PDP)

CRT TECHNOLOGY:
CRTs use a beam of electrons to stimulate phosphors and thus make the image. The beam strikes the phosphor cells at an angle, however, and this creates a larger spot size. Also, because it is difficult to focus the beam at all points, the image will be less precise in some areas.
PLASMA TECHNOLOGY:
Each Pixel contains 3 cells, green, red, and a blue. Plasma Display Panels stimulate phosphor cells individually with electrodes.  There is no loss of focus.
CRT RESULTS:
bulletGeometric distortion.
The picture on a CRT will always have a certain amount of distortion.
 
bulletUneven light output.
The picture on a CRT will have areas that are brighter and areas that are darker than others.
 
bulletDifficulty focusing across the entire screen.
The picture on a CRT will have some regions that are not as focused as others.
 
bulletPicture distorted by magnetic fields.
The CRT's electron beam can be influenced by magnetic fields, which results is a distorted image.
PLASMA RESULTS:
bulletNo geometric distortion.
The plasma panel's accurate cell structure produces a picture that is geometrically perfect.
 
bulletEven light output.
The plasma panel is perfectly evenly illuminated - no dark or hot spots.
 
bulletPerfect focus.
The plasma panel has perfect focus across the entire screen
 
bulletNo susceptibility to magnetic fields.
The plasma panel is not affected by magnetic fields.


Higher resolution
Plasma display devices have higher resolution than conventional TV sets, and are capable of displaying full HDTV and DTV signals as well as XGA, SVGA and VGA signals from a computer. For example, you can get plasma displays with a 1024 x 1024 pixel high-resolution that can display images at true 1080i and 720p HDTV resolution, as well as 480i and 480p HD signals.

   
 

No scan lines
Conventional CRTs use an electron beam to scan the picture tube from top to bottom at regular intervals, lighting the phosphors to create the image. In the case of standard (NTSC) TV, visible scan lines can be seen.

Most plasma displays include built-in line doubling to further improve image quality when viewing standard analog video sources such as TV broadcasts and VCR tapes.

   
 

Exceptional color accuracy
High-end plasma displays are capable of displaying 16.77 million colors -- providing superb color realism with exceptionally subtle gradations between colors.

   

Widescreen aspect ratio
Plasma display devices have a widescreen 16:9 aspect ratio, the relationship between the screen's width and height. This is the proper aspect ratio for HDTV, and also allows many DVD-Video movies to be viewed in widescreen format, as originally seen in the theater.

 

Perfectly flat screen
Plasma display monitors have screens that are perfectly flat, with no curvature whatsoever. This eliminates the edge distortion that can occur in CRT displays.

   
 

Uniform screen brightness
Unlike some rear and front projection televisions that suffer from uneven screen brightness -- seen as "hot spots" in the middle of the screen or a darkening near the edges and especially corners -- plasma displays illuminate all pixels evenly across the screen.

   

Slim, space-saving design
Plasma display monitors are only a few inches thin-providing installation options never before possible. In addition to stand mounting, they can be hung on a wall or from a ceiling, allowing you to enjoy big-screen home theater impact from a component that doesn't dominate floor space. Conventional TVs and front projectors, by comparison take up far more real estate and are much more limited in placement flexibility.

Plasma monitors have an elegant, understated "picture frame" appearance that blends inconspicuously with any dˇcor; with a chassis not much wider than the display screen itself.

Because they eliminate the need for a front projection unit and a projection screen, plasma display monitors are also ideal for use in a wide variety of business and commercial applications where the use of a front projector would not be feasible.

   

Wide viewing angle
Plasma displays offer a viewing angle of 160 degrees (top to bottom and left to right) -- much better than rear projection TVs and LCD displays. This allows a larger number of viewers to enjoy proper image reproduction from a wider variety of locations throughout the room.

 

Universal display capability
Most plasma monitors can accept any video format formats. Typically, they will include composite video (NTSC, PAL SECAM) (standard RCA jacks), S-video and component video inputs, plus one or more RGB inputs to accept the video output from a computer.

Whether you want to view a sporting event on HDTV, a DVD-Video movie, a satellite broadcast or even surf the Internet with incredible big screen impact, chances are a plasma monitor will accommodate your needs.

 

Immunity from magnetic fields
Because plasma displays do not use electron beams, as conventional CRT displays do, they are immune to the effects of magnetic fields. Components such as loudspeakers that contain strong magnets can distort the picture if placed too close a standard TV (which has a CRT). On the other hand, plasma displays can be placed in close proximity to any type of loudspeaker and not experience image distortion.


Plasma Tv Characteristics:
Highly susceptible to screen burn in.
  Want to play your favorite video game on your new Plasma TV?  Not the best idea.  Accidentally left that freeze frame from a movie you're watching on the Plasma TV for too long? You'll end up looking at it's ghostly image for as long as you own it.

Leave a static image on this unit's display screen for too long (like the vitals of your character on a video game or the freeze framed image from a DVD movie), and it will be burned into the screen forever.  They are even more susceptible to image burn than regular tube Televisions (LCD or DLP Front Projection technology is the only safe zone there).

If a pixel matrix burns out, it will be burnt out for good, no fixing it.  The individual pixels created by the plasma filled chambers will eventually give out, everything wears out over time.

Granted, this will be only one, tiny pixel dot in a grid of over a million and may not really be noticeable.  But that depends on which color of the three in the pixel matrix gives out.  If all three give out, it will be a black dot.  If the red and blue give out, it'll be a green dot.  If the green and red give out, it'll be a blue dot.  Get the idea?

No matter what any Salesperson tells you, these cannot be re-charged" or "re-filled".  Once the pixel burns out, it burns out.  Warranty will cover it?  The warranty coverage is a little grey right now.  The unofficial guideline most mfg's are using is if four or more pixels are burnt out, they will replace the  screen. ($2,000-$5,000)   Less than that, I'm afraid you'll have to put up with it.  A few manufacturers say it has to be 20 pixels before the set is replaced.

Plasma TVs are affected by altitude.  Most manufacturers say that 6500 feet above sea level is the maximum operating altitude limit for a Plasma TV.  A few others say 5500 feet.

The added pressure at higher altitudes cause the unit to work harder and, therefore, get hotter to display the picture.  Most units have cooling fans (convection style or otherwise) but they, too, will be working harder to keep up with the additional strain and will, thusly, become louder.  And because it is working harder, the life expectancy of the unit is greatly reduced.


No one really knows for certain as to the life expectancy of a Plasma TV.  The only real standard that seems to be used to judge this is based on the units some manufacturers have operating in major airports.  Some have screen failure at one year, (constant use). Most have done well for 22,000 hours of constant use.  Take this figure and divide by the average amount a person watches TV per day. Example: 4 hours, you get 5500 days of viewing or 15 years of life. 22 hours of use per day and you get 1000 days of use or 3 years.

But the phosphors that make the color dissipate over time and that dissipation begins the moment you turn the set on.  After 1000 hours, it is reported the picture brightness is reduced to 94%, which, really, is barely noticeable.  Over time, though, this increases.  At about 15,000 hours you get a picture quality brightness of about 65%.

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