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I think, if I'm not mistaken, plasma has a very short lifespan compared to DLP.
taken from pcworld.com,
"But some phosphors on plasma sets may fade faster than others, leaving ghostly patterns on the screen--an effect known as burn-in. If you're addicted to CNBC, the ever-present ticker tape at the bottom of the screen will eventually leave a mark--as will static elements in video games (such as boxes showing your score) or the blank panels you get when programs don't span the full width or height of the screen. You can still watch this content, but if any single one dominates you risk burn-in."
DLP's bulbs burn out, but they're only a few hundred to replace (and I believe they last around 3 years).
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