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Why do smartphones have OLED screens if they get burn-in problems easily and quickly?

Discussion in 'Android Lounge' started by varamilc, Jul 7, 2020.

  1. varamilc

    varamilc Newbie
    Thread Starter

    Why do smartphones have OLED screens if they get burn-in problems easily and quickly and has pulse width modulation and can damage the customers eyes or blind them and have, this doesn’t seem safe?
     


  2. ocnbrze

    ocnbrze DON'T PANIC!!!!!!!!!

    i have no idea what the heck you are talking about? blind them? where are you getting this? sounds like fake news to me. i have owned the note series since the note 4. i am not blind. my phone never got burn in. so i think you are making false generalization, just because you got burn in on your phone. it has nothing to do with all oled screens.
     
  3. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    Well for one thing they don't get burn in easily and quickly. I've a 3 year old AMOLED phone currently, and had another one 2010-2013 (so much earlier version) and neither has ever suffered burn-in. Nor has anyone else's I know. Yes, display models, which are badly abused (screen on permanently at full brightness for months showing the same image), do develop this, and there are the occasional bad units (as with any tech), but the vast majority never develop this issue. And you started another thread a few days ago with the same question, so why are you ignoring the responses in this thread?

    Pulse width modulation "damaging eyes" or "causing blindness": citation needed, I'm afraid - and it had better be properly peer-reviewed. People sensitive to the flickering can suffer fatigue from low-frequency PWM, but that's very different from "causing blindness", and I've not found any source claiming that, never mind any credible source (remember that any idiot can produce a website: anti-vaxxers, flat-Earthers, climate change deniers all produce floods of bullshit justifying their entirely false propositions, so just finding a website making a claim proves nothing. This is why I say show a properly peer-reviewed study if you want to justify that statement).

    Looking at your post history you seem to have a thing about eye damage from various sources, which makes me wonder whether you spend a lot of time looking for material that supports your fears?
     
    #3 Hadron, Jul 7, 2020
    Last edited: Jul 7, 2020
    ocnbrze likes this.
  4. PWM is a very common means of controlling brightness on LED devices and is hardly unique to AMOLED screens. It's used because unlike filament bulbs which have linear dimming relative to input voltage, LED's are nonlinear and their brightness does not vary that much over a wide input range. So PWM control is used to vary brightness by rapidly turning the LED on/off. Home, industrial, and automotive LED lighting all use this method.
     
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  5. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    Of course you also get flickering from fluorescent lighting, and from old cathode ray monitors and TVs, and all of those are at significantly lower frequencies (and hence more perceptible) than a dimmed AMOLED screen (there will be less modulation at higher brightness). So I can't help wondering whether the authors of the sites that express (and promote) concern about this have similar concerns about those technologies?

    (It was the comment about "home lighting" above that made me think of this).
     
    ocnbrze likes this.
  6. And fluorescent lights emit UV, plus mercury vapor if you break a bulb. CRT's emit X-ray radiation (not a lot but you don't want to stay too close), lots of toxic stuff inside those too (mercury, lead, phosphors). Everything's bad for you.
     
    ocnbrze likes this.
  7. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    The human body typically has a radioactivity of 4-8 kBq depending on who you ask (Bq = Bequerels = nuclear disintegrations per second). So there really is no getting away from nuclear radiation ;).

    Sharing a bed with someone will expose you to a dose of 0.05 microSieverts, or 0.5 BED ("banana equivalent dose", i.e. the dose of radiation you would absorb as a result of eating a banana. Yes, this is a real unit, though not one that we often use in my field).
     
    ocnbrze likes this.
  8. puppykickr

    puppykickr Android Expert

    @Hadron

    Hey, now!

    There are flat-earthers all around the globe!
     
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