In other news my nearly four-year-old Note 2's display looks as it did on day-one. I used it for two years straight before buying a Note 4, then as a backup as I used the Note 4 and now an iPhone 6S Plus. In some ways I prefer its display to my 6S Plus.
Considering my Note 2 came out in 2012, and much progress has been made since then, you will have to excuse me if I think your comment is just a bunch of sour grapes.
Mike
And in other other news, I can walk over to the mall today and find a galaxy s6 on display with image retention So bad that it would be borderline unusable.
OLED displays do burn in, they burn-in at a faster rate that LCDs, (this has gotten much better over the last 2-3 years) whether or not this is a problem for an average user is up to debate (probably not over the 2 year life of a device)
as recently as 2013 OLED still had some pretty significant shortcomings. Color accuracy, brightness, average and white screen power consumption, and image retention as compared to LCD.
However OLED has made progress and has reduced or eliminated these issues (look at galaxy s6 display). So now (or last year) is when I would have considered OLED to be the "better" display technology.
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There will never be a way to eliminate OLED problems completely.
We already know Apple has lost the magic, so it wouldn't surprise me if they switch to OLED.
On the other hand, if they went to mLED... whoa
mLED isn't ready for mas-production yet (from what I have read) Probably a few more years.
Apple supposedly has a lab working on this tech, but haven't heard how far along they are.
An mLED display would be essentially a "swap-in" for an OLED display, so Apple may be switching over to OLED as a stopgap to be later replaced with an mLED display in a coming iPhone.
It would be AWESOME if the iPhone 7 had it though! *surprise*