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do you ever wonder what the pixel cleaning or pixel refresh option is on

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your fancy new OLED TV or monitor sadly it doesn't Windex your screen for you

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despite the name but it could be the most important feature your display has

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as it's crucial for mitigating a serious problem that's intrinsic to oleds even

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if you're not an expert on displays there's a good chance you've heard of

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Burnin where ghostly visual artifacts stay on your screen if you've displayed

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a static image for too long but here's the thing burning is actually kind of a

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misnomer it's not like something is literally burning after images into your

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screen a better name for this phenomenon is image retention and there are two

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types of image retention that pixel cleaning is supposed to help prevent the

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first is a more temporary issue after leaving your display on for hours or

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even minutes the little transistors that drive the pixels end up reacting

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differently to the same input voltage as a result some pixels don't light up as

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evenly as they should resulting in image retention the good news is that this

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typically isn't too hard for modern OLED displays to correct after a few hours of

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use many displays will run a shorter pixel cleaning or compensation cycle

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that lasts a matter of minutes once you turn them off what it's actually doing

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is adjusting how much current goes through the transistors so that they'll

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emit the proper amount of light the next time the TV is turned on we should also

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point out that this temporary retention can also be a side effect of your

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display heating up from normal use and if this is the case with your TV you can

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usually resolve it just by turning it off for a little bit and letting it cool

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down unless it's in the house with some evidence you need to get rid of however

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there's a more potentially catastrophic kind of image retention that your OLED

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has to deal with in a different way and we'll tell you about it right after we

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retention is a result of the chemicals in the organic LEDs themselves degrading

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over time this natural wear and tear is

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irreversible and doesn't happen evenly instead which pixels degrade faster

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depends on exactly what is being shown on the screen which is why static images

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can visibly damage your display if they're left up too long and too often

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this means that the pixel cleaning Cycles focused on permanent retention

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try to make up for uneven wear rather than truly restoring the pixels to their

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original state this kind of compensation cycle takes a longer amount of time

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sometimes an hour or more and works by measuring how much each pixel has

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degraded so that the TV can drive it harder accordingly the next time you

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turn it on the more a pixel has worn down the more current it needs to reach

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its proper brightness typically TVs won't do this until they've been used

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for quite a while such as a couple thousand hours but confusingly displays

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differ as to what they'll call their short and long pixel cleaning features

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so be sure to check your products on screen instructions or user manual to

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figure out which is which if you have a display that allows you to run a refresh

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cycle manually and don't run the longer refresh too often as you don't want to

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start driving your pixels harder unless you have to plenty of modern displays

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are smart enough to do this automatically at the correct intervals

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once the display is turned off so our advice is to only manually run the long

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compensation cycle if you can visibly see there's a problem and of course it

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helps if you don't watch cable news for more reasons than one but I have to

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thank you for watching this whole video instead hey like the video if you liked

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