General > General Technical Chat
An expensive TV is a poor investment, and people spend FAR too much on them
tom66:
I just checked our plasma in the test patterns mode.
I can just about see some signs of burn in on the red/green patterns, from a channel logo, interestingly the blue phosphor is perfect (not sure why it would last longer?)
But it's so subtle you need to really look for it, and you can't see it on ordinary images or on the full white screen.
Certainly Panasonic seemed to have cracked the burn in issue if a 10-year old TV is still almost factory perfect. I wonder how good OLED will be in the real world.
MK14:
--- Quote from: tom66 on February 05, 2022, 05:33:54 pm ---I wonder how good OLED will be in the real world.
--- End quote ---
Now you mention it. I think in some past thread on here (that I didn't participate in), explained or mentioned that some modern OLED TVs, have (what I think), is a very clever innovation.
They are able to either remember how much each pixel has been used, and then using maths formulas, keep the entire set of pixels in calibration. By automatically balancing out the intensities (presumably, more use=needs intensifying, less use = needs attenuating intensity).
Alternatively, they have some way of sensing how much each pixel, has worn out. Perhaps (following is speculation on my part), during a special calibration/anti-burn in fix mode, it electrically measures each pixels, voltage/current/hence-resistance/other-measurable-characteristics, and hence makes the screen look perfect or nearly perfect.
If I remember correctly.
KaneTW:
The Sharp LCD panels' datasheet I have here explicitly says that static images should not be displayed for longer than two hours, otherwise damage to the liquid crystal may occur.
Nusa:
The thought that a TV is an investment at all is the real problem here. Unless you're in the business of buying wholesale and selling retail, and even then you don't want to buy more than you can sell in the very near future.
MK14:
--- Quote from: KaneTW on February 05, 2022, 07:59:20 pm ---The Sharp LCD panels' datasheet I have here explicitly says that static images should not be displayed for longer than two hours, otherwise damage to the liquid crystal may occur.
--- End quote ---
Apparently, newer LCD screens, can also suffer from some kind of image retention. Most sources seem to say it is a temporary effect, but maybe it can be permanent. The following link, talks about it further and gives a picture, where it has happened.
https://en.wikipedia.org/wiki/Screen_burn-in
I suppose these technologies are changing all the time. Sometimes for the better, other times to save production costs, and it will not necessarily be good for the user and/or the product life expectancy.
I'm use to somewhat older LCD screens, which may not represent the latest, modern LCD panels. Perhaps they have got worse in later years.
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