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About The
Technology
Plasma
Technology
Plasma displays function differently
than any other TV technology in that they actually produce light
independently at each pixel on the screen, as opposed to projecting
a separate light source through or off of other elements to conjure
a picture. A plasma "screen" is actually a dense network of
individual cells, three for each pixel of the display (coated with
red, green and blue phosphors, respectively). Each cell is
impregnated with a rare-gas mixture and connected to an individual
electrode. When the electrode for a given cell is charged with an
electrical voltage, the gas is converted to a plasma state and emits
a burst of ultraviolet light; this in turn causes the phosphors to
react and produce bright visible light at the pixel level. By
varying the voltage and intensity of the electrical charge, the
proper combination of red, green and blue light is produced in each
pixel to combine into a bright, colorful composite image. Plasma TVs
are available in sizes from about 40" up to 70"+, but be prepared
for sticker shock as your size desires increase.
Strengths
Obviously, plasma TVs are desirable for their sleek form factor —
about 4" deep and wall-mountable, they're undeniably sexy.
Furthermore, plasma produces a very bright image that can be viewed
in a well-lit room, with superb color accuracy and saturation. It's
a matter of opinion, but many videophiles regard plasma's color
vibrancy as beyond compare among current technologies. Because the
light is produced at the screen rather than projected onto it, focus
is consistent and reliable across the entire screen surface, and
plasma screens can be viewed from angles as severe as 160 degrees
off-axis without detrimental effect. And plasma's accurate pixel
structure produces a picture that is geometrically perfect from edge
to edge and corner to corner, with uniform light output and a crisp,
lifelike image.
Considerations
Due to the direct way it produces light, plasma can be especially
susceptible to burn-in from static images such as stock-tickers and
video-game gauges; however, newer displays have begun to incorporate
"pixel-orbiting" technologies that shift images, almost
imperceptibly, to limit the occurrence of burn-in. Additionally,
although known for their high contrast (relative to LCD) and
spectacular color saturation, plasma displays have historically had
difficulty reproducing pure blacks. Recent enhancements have largely
eliminated this problem, but sometimes at the expense of fine detail
in dimly-lit areas of the picture.
The Bottom Line
Overall, plasma has maintained a reputation as the no-compromise
high-tech TV display technology. While that's not entirely accurate,
there's no question that a plasma TV on your living room wall will
deliver amazing video performance — and, quite likely, a parade of
drooling friends through your door as well.
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