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An expensive TV is a poor investment, and people spend FAR too much on them
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james_s:
I've never actually paid money for a TV, but if I ever do buy one it will be OLED. They just look THAT much better than LCD, the deep inky blacks and vivid colors. The screen burn problem is mostly due to those stupid channel logos all of the broadcast channels have now, I haven't watched cable/satellite/broadcast TV in years now largely because of the annoying logos. CRT based projection TVs which used to be the only way to get a big screen were notorious for screen burn. Same with plasma, and to some extent even regular direct view CRTs were prone to it if used long enough at a high enough brightness. OLED is no different really, use it for watching video without static elements and it isn't an issue.
james_s:

--- Quote from: Circlotron on February 04, 2022, 12:10:05 am ---Backlight LEDs are the new vacuum tubes.

That said, what was the economic life of a vacuum tube TV back in the day? Not how long it could be made to last but how long it was worth the average person getting it fixed every now and then. And the relative purchase cost compared to a normal TV nowadays? Mum and dad's first TV in 1957 seemed to last forever, a lifetime in fact. And when I was 12 it did.

--- End quote ---

They weren't as reliable back then, but they were very expensive so it was worth getting them fixed and it wasn't unusual for people to keep a TV for 10-20 years. The very first color TV sold in the US came out in the 1950s and cost the equivalent of around $15,000 today. Even in the 70s a basic 19" B&W TV was around $200 and that's equivalent to around $1200 today.
KaneTW:

--- Quote from: MK14 on February 05, 2022, 08:20:25 pm ---
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.


--- End quote ---

Right now there are only a handful of these panels in existence so I don't want to waste them, but once we have some more I'll run a static image test and see if it actually occurs. These are pretty bleeding edge panels with ~1.2k PPI, so it wouldn't surprise me if they have to make longevity tradeoffs to get the PPI that high.
rsjsouza:
Owner of a 2008-era 55 inch Sharp LED TV still going strong, which was the biggest motivator to get another Sharp in 2015 (a 70 inch 3D) model. Both work incredibly well, but the image on the bigger one is less consistent.

MK14, is this the thread you had in mind?
https://www.eevblog.com/forum/repair/oled-tv-panel-broken/

MK14:

--- Quote from: rsjsouza on February 05, 2022, 11:50:26 pm ---MK14, is this the thread you had in mind?
https://www.eevblog.com/forum/repair/oled-tv-panel-broken/

--- End quote ---

I don't think it was. I vaguely remembered it being user Wraper, who mentioned it.

Ironically, in a similar thread to this one, with identiclal OPs (eti).
https://www.eevblog.com/forum/chat/why-do-backlight-leds-burn-out-and-go-blue/msg3806399/#msg3806399

The OLED stuff, is dotted about that thread, all over the place, but I pointed to one of the mentions, related to measuring the OLED parameters to calibrate out the screen burn. In that (or other posts), they say that some OLED repair threads on here (I think you found one or a similar one, in your link), mention about calibrating out the screen burn.

EDIT: I tried somewhat extensive googling and youtubing, but not found out much more. Except the OLED TV itself, explains about it. It says something about measuring the thin film transistors (tft) voltages to recalibrate itself and fix the image retention/burn, or something. See here (At around 2 mins 35 sec):

https://youtu.be/dHwB1IDVzZU?t=155
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