This exact idea has been floating around in my head for ages, and I always wondered how well it actually worked - now I don't need to wonder. I started thinking about it as a potential solution to OLED burn-in. Thankfully, my OLED TV doesn't have any burn-in yet, so I never needed to investigate further.
not the greatest picture (some reflections). should have used a gray background, but I used red because this color is the most affected.
The burnin is mostly harmless, but the middle blob is very annoying; yellow parts of the image become greenish when they get to the middle of the screen.
My 3 year old Panasonic gets used a lot but we keep the brightness down to the 45–55% range (it’s plenty bright) to avoid burn in. We also don’t display static content on it. And when we do, it’s mostly from Kodi which dims itself after 10 min or so.
All that to say for those who are fearful of OLED because of burn in: don’t be. With some precautions, it’s fine. And having true blacks is absolutely glorious. I enjoy it every time I use the screen.
Build a comprehensive degradation profile of your LEDs. Keep the burn-in accumulation buffer that tracks intensity and usage amount of each subpixel. Use it in your EOTF to correct the picture.
Some color-accurate monitors like Eizo are even profiled for temperature (and have a grid of temperature sensors)