I have seen several LG OLEDS that the burn in was almost cleared up after a few power cycles. What is causing this to almost go away after a power cycle, then almost entirely gone after a few?
I have never seen that. But it is very clearly NOT burn-in. As just cycling the TV on/off would do nothing about burn-in; that would be impossible and against the laws of physics in the universe.
Maybe some kind of image retention issue with the drive board? That sounds crazy but I'm struggling to think of a rational reason for what you have experienced.
Burn-in is a result of physical changes to an OLED cell. If these changes are temporary, some sort of "relaxation" period may reduce the visual artifacts.
I'm sorry, I lost the link to the synopsis of a research paper indicating that the v-i curve changes for burned-in pixels. This suggests a technique for dealing with pixel drift over time. One could map the v-i characteristics of each pixel (perhaps during a power cycle or maintenance run), then store a dot-by-dot correction factor in a table lookup applied to each displayed frame.
I actually just found it on LG's website. They have what LG is called and Anti-retention Cycle.
From the Article :
"OLED Image Retention or Burn-In: Burn-in and image retention are possible on virtually any display. However, with an LG OLED TV, any risk of burn-in or image retention have been addressed through the use of technology that not only helps protect against damage to the screen, but features self-healing properties so that any short-term image retention that may occur is quickly rectified."
Again, if it is just a light image retention, then several manufactures (not just LG) have methods of helping wipe that. We discussed this earlier in this thread. It is NOT healing/fixing anything, it is wearing the whole panel to address the difference in brightness between the pixels. With only slight image retention, that method works fine to cover that up.
If it is severe burn-in, then there is no amount of wiping that is going to help. The pixels have been to worn in a specific area for that to work. Only more drastic and complex methods will work to lessen the burn-in. Also again, severe burn-in usually only happens with 1 of 2 things: improper settings which promote burn-in. And the customer that keeps his TV on all day, with a static image.
Last edited by Brad Humphrey on January 20, 2018 12:29.
i discussed this with an LG engineer when we had some of their Oled Dual displays and a 86" stretch brought in for a trade show-
i am paraphrasing here and while i was trying to pay attention he was moving pretty fast and it was a trade show floor, but here is my understanding-
Oled cells can kinda of "hold on" to the electrons that are use to excite them to produce light.The more electron retained the less the "new" electrons can excite. the "cleaning"process is essentially the TV trying to strip these retained electrons from the OLED cells.
it takes approximatly 3 times longer to remove then it does to retain.
Commercial displays do not have the "cleaning" process because you quickly will run out of time to strip(i.e. TV on longer then 8 hours a day)
this was my understanding anyway , I could be certainly be wrong or misinterpreted what he was saying.
Last edited by Proggieus on January 21, 2018 21:32.
it takes approximatly 3 times longer to remove then it does to retain.
Commercial displays do not have the "cleaning" process because you quickly will run out of time to strip(i.e. TV on longer then 8 hours a day)
TV on more than 6 hours a day. TV on for 6 hours, loading up the electron box; three times that (18 hours) per day to clean them out; that totals 24 hours. It's an easy mistake to make.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Organic Light Emitting Diode (OLED). Doing a search I did find several research articles on capacitance related to OLEDs. So maybe there is something to what the LG engineer was saying. Who knows. What I do know is: many people you get to talk to from a TV manufacture, are usually idiots. They have no clue about anything and they get tried of listening to people ask them a million questions, that they have no clue about. So what do some of them do; they make shit up. That has been how more than a few silly misconceptions have gotten started about certain video display technologies, thru the decades.
More than ever, society seems to be flooded with trolls. People that just can't help themselves but to lie & deceive and love it when they get someone to believe their insanity. Never trust ANYTHING someone tells you these days, until you verify it yourself or research it from a creditable source.
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