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Flat Screen Plasma TV Information and Help
In the Old Days, TVs all had rounded fronts and very deep backs. That's because a TV was in essence a mini-projector. There was a full projector set in the back of your TV set pointed at the front glass, showing the image in reverse. Yes, technology progressed so that projector got smaller and smaller, but there always had to be some amount of size involved to have that image created.
Plasma is one of the two main new forms of "flat screen" technology, the other being LCD. Plasma is the highest end technology currently available and as a result is VERY expensive - and is primarily used for large widescreen sets (42" and up). Color plasma screens were created around 1995.
Plasma is actually a layer of gas that is caught between two panes of glass. The gas is typically a mixture of neon and xenon. Next, a series of wires are embedded into a grid on one of those panes of glass. As the TV turns the wires on and off, the gas glows. There are trios of 3 colored phosphors - red, green, and blue - all over the glass. Depending on which phosphor is caused to light up, that combination creates the image. That causes the picture that you see.
Plasma has many of the same issues as LCDs as far as contrast not being great. You don't get really rich blacks. However, plasma IS great as far as viewing from angles. You can sit to the side of a plasma set and get a great image - something that isn't always true with an LCD set.
One problem with plasma is that it can be burnt in. Burn-in is what happens to ATM machines after a few months - they show that welcome screen for so long that you can still see its ghostly image when you do other operations. If you play video games with static items (like a health bar always in the top left corner) - or if you watch TV channels with a stationary item (like an ESPN logo always in the bottom right), after a while that will actually burn in to the TV's standard display.
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Note - Lisa Shea wrote this content for the genealogy site at BellaOnline.com - you might still find this content there as well. That's fine :) I gave permission!
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