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Which is more susceptible to burn-in? (1 Viewer)

John_Berger

Senior HTF Member
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Obviously, all TV sets are susceptible to burn-in when a section of the screen is bombarded with a constant image. However, which is more susceptible to burn-in - a regular tube-based TV or a projection TV - and why?
The science lover in me is curious. :)
 

Sumir B

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Jul 16, 2002
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From what I have read, RPTVs are much more susceptible to burn-in. I, however, cannot tell you why. Sorry:frowning:
 

SteveMo

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Jun 19, 2002
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The phosphors burn quicker because they get more hot than the single CRT design I think.

Just guessing here.
 

Kevin P

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Projection TVs and CRT projectors exhibit phosphor wear/"burn in" faster than direct view sets because the phosphors are driven harder on a projection set. On a direct view set you're looking directly at the phosphor coating on the front of the CRT. Therefore, the phosphors don't have to be driven very hard to produce a bright picture. Projection sets use three small CRTs (usually 7" diagonal each) attached to a stack of lenses that then project those three 7" images onto a much larger screen (40 to 80" diagonal). Therefore, in order to produce a watchable picture, the phosphors have to be driven much harder (brighter) than on a direct view set. Brighter translates to more wear and tear on the phosphors, and greater risk of burn-in in a shorter period of time.

That's basically the gist of it. Still, with proper care, projection CRTs will give you many years of service.

KJP
 

Jack Briggs

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Jun 3, 1999
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What Kevin said--except that the CRTs in most RPTVs are seven inches in diameter. :)
You can, as you probably already know, squeeze the maximum lifespan out of an RPTV and a direct-view by taking the proper precautions against burn-in (i.e., white and black levels adjusted reasonably, etc.).
 

John_Berger

Senior HTF Member
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Nov 1, 2001
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Ah. So, there is no actual phosphor on the screen itself. Interesting. That certainly does answer the question, and a few others.
I guess that I should lower my brightness and contrast. :D That's still impressive that the picture quality can be that good from 7" CRTs.
Thanks, guys!
 

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