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Plasma and LCD Technology
You see flat screen TVs everywhere. They will become more prevalent as analog TVs are phased out and digital TVs become standard.
Plasma technology and LCD technology have both produced excellent visual representations of the original moving images. But, there are differences.
Plasma screens are comprised of individual cells filled with a nobel gas (neon and xenon) that gives off light when energized by an electric charge. The back of each cell is coated with a phosphor that is energized by the plasma gas to produce colored light.
The phosphors can lose some of their ability to produce light the longer they are used. Overall, a plasma display used for normal video has a useful life expectancy of 60,000 hours. At that point, the phosphor has lost half its ability to produce light. While this may seem a long time, if the screen is used for video games or computer applications where certain cells are consistently energized, the decreased ability to produce light may be detected when normal video is displayed. This is called burn-in.
The energy used by a plasma display is comparable to that of a traditional CRT or picture tube of an older TV. Because of this, plasma displays cannot be used in portable devices.
Since light is generated in the individual plasma cells, the picture on the screen can be seen over a wide angle, making this technology ideal for displays to large audiences.
In a liquid crystal display, two perpendicular polorizing filters are sandwiched together between many colored liquid crystal cells. In a backlit screen, the liquid crystal cells twist the light that passed through one polorizing filter so it will pass through the next filter. That pixel appears bright. When these liquid crystals are fully energized they align so the light does not pass through the second filter. That pixel then appears dark.
Because the light from a back lit screen goes in nearly a straight line, the viewing angle of an LCD screen is less than for a plasma screen. This limited viewing angle may reduce the number of people able to view the screen.
One advantage of LCD screens is that they require low power. They are suitable for displays on digital watches and laptop computers that often run for hours on a battery.
Another advantage of LCD screens is that they can be made in higher resolutions than plasma displays. So, on smaller screens, the LCD will display a cleaner, crisper image.
You should consider your intended use as well as price to make a wise decision in choosing either a plasma or an LCD screen.
The following are resource you can use related to video and audio solutions:
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Plasma Technology in the News
Clarycon RSS feeds
Clarycon's RSS news channel provides frequently updeted news on plasma technology and advanced devices.
Etching of porous SiOCH
In this study, the effect of the mask material on the etch behavior of porous SiOCH was studied with cross section SEM, decoration methods and XPS.
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Contact Etching
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