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Why do backlight LEDs burn out and go blue?

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wraper:

--- Quote from: bdunham7 on November 11, 2021, 04:51:38 pm ---OLED TVs have been out for 14 years, but those were rare, expensive and not very good.  Modern, mainstream 4K OLED TVs have been out about 4 years or so, AFAIK.  Here's an LG OLED with screen burn after about 4 years of use.  Go to 2:30 to skip the lower-time ones without burn.

--- End quote ---
If he had manually ran compensation cycle, most likely those issues would be gone.

bdunham7:

--- Quote from: wraper on November 11, 2021, 05:59:06 pm ---If he had manually ran compensation cycle, most likely those issues would be gone.

--- End quote ---

I've seen no success with screen-burn reduction apps in other devices--is there something special about the compensation cycle in an LG OLED?  Does it know somehow which pixels are weak?  Does it store calibration data?

wraper:

--- Quote from: bdunham7 on November 11, 2021, 06:08:37 pm ---
--- Quote from: wraper on November 11, 2021, 05:59:06 pm ---If he had manually ran compensation cycle, most likely those issues would be gone.

--- End quote ---

I've seen no success with screen-burn reduction apps in other devices--is there something special about the compensation cycle in an LG OLED?  Does it know somehow which pixels are weak?  Does it store calibration data?

--- End quote ---
AFAIK it somehow measures the voltage on individual LEDs or something like that. IIRC there are repair threads on eevblog where after running it, visible burnout effects disappeared.

james_s:

--- Quote from: Zero999 on November 11, 2021, 08:03:30 am ---That's a very close minded statement. Technology improves all the time and the day might come when OLED displays become highly reliable and better performance than LEDs. You just don't know what will happen. I'm pretty sure some electric car owners, said the same thing about EVs in the past.

--- End quote ---

I have so far never paid money for a TV, but if I do ever buy one it will be OLED. The picture quality is simply stunning, no LCD can even come close. It's not like LCD TVs are some shining beacon of reliability either, right now I have two nice big LED lit LCD TVs in the back of my closet that have bad backlights. The 65" LCD that is my main TV is one I got for free because the LED backlight had failed. OLED TVs are already more reliable than a lot of LCD TVs.

eti:

--- Quote from: bdunham7 on November 11, 2021, 03:34:42 pm ---
--- Quote from: wraper on November 11, 2021, 12:17:36 pm ---LOL, LG OLED TV in most cases last longer than LG LCD with failing backlight.

--- End quote ---

That's a pretty low standard.  It is certainly possible that LG has perfected the OLED display and there won't be any issues, but given the track record of LG and the OLED in general, I'm not going to give them the benefit of the doubt quite yet.  The few years that they have been out isn't enough to convince me to replace my 14 year old plasma TV.  I like to keep things and a TV that only lasts 5 years would really irk me.

--- End quote ---

2007 vintage Panny plasma here, given to us by a couple who were - ahem - "upgrading" - still going strong, daily use, MANY hours!

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