Hello.
I just bought Galaxy S8. I know that AMOLED screen really turn off pixels when the colour is black. So, is it true that using black theme can prevent burn-in on AMOLED display?
Why Samsung remove black navbar colour in one of update? I just read that it's possibly connected to burn-in display problem.
OLED screens don’t use powered pixels to create the black color on a display; instead, black pixels are simply pixels that are switched off. This means that activated pixels — that is, the non-black pixels on a display — degrade at a faster rate.
In extreme cases, this can lead to certain parts of the screen becoming lighter than the rest of the display — what we typically refer to as burn-in.
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So, is it safe to use black theme on Galaxy S8? Will it help to avoid or slow down screen burn-in?
I think you're reading that wrong. The quote is saying the NON-black pixels can lead to burn in - they are the ones that degrade faster.
I run my phone as black as I can get to conserve battery. Plus it's easier on the eyes.
Related
As seen by the NoLED app over in the dev section, and in a few other places on the net, people are finding that when they display a black image on their amoled/samoled screens in a dark room there is still light emitted by the display. it is not truly black
I would like to know why!
One thing i hear is about image compression and signal noise causing the pixels to not display #000000 black and instead a variant of black/grey causing the pixel to become lit.
This problem is not an issue during the day, i can't tell the difference when my screen is displaying black or off. but what it does effect is battery life.
If the screen isn't powering down its pixels then it is not saving anywhere near as much power as it could do
Also
How happy are you with your display?
I knew about the pentile problem before buying, however i am not dissatisfied with the display at all. Infact if i did not read up about it i would not have realised there was anything different with the screen.
Text is clear and sharp, images are vibrant, and colours seem true with no issue of pink problems like the desire
looool, look at any lcd screen(tv whatsoever) and you don't have true black, because the backlight is on. Only the best LED LCD screens in TV world have FULL LED backlight that can dim the leds from parts of the screen that are fully black in the processed image.
take care
yup, if you take apart your LCD watch, phone, laptop or monitor
you'll see 2 layers, first layer the LCD/TFT/AMOLED/SAMOLED/etc whatever new technology screen you can think of name it here.
then the bottom layer is pretty much like a light bulb/white led/ccfl or whatever you want to call it to light up the first portion of the screen.
most devices you can control the 2 separate pieces separately via "screen" and "back light"
you'll noticed that usually on software options what specifically lets you control both indedpendly.
Eh.. Yes But the SGS hade OLED screen. So it should be able to turn pixels completly off. My guess is that each led has some very small current applied to it possibly to speed up response off screen.
But it come close to true blacks..
EDIT
OLED screen has NO backlight... Each pixel is an tiny led...
Sent from my GT-I9000 using XDA App
thanks for the heads up, that's good to know
i've yet to take apart a new SGS to figure out how the AMOLED displays works
You guys need educating on displays lol
oled screens have no backlight, thus no backlight bleed.
That means that this is a software issue, unless the screen not powering down completely is intentional
Software issue and nothing more.
Open up the calculator, drag down the numpad, hide the 2 stripes (status bar and numpad drag bar) in the top and bottom of the screen, and tell me if you see any lighting.
There's absolutely nothing.
there is still light emitted. cover up the top and bottom bar with your hands, go into a completely dark room then look into the center of the screen.
There is a uniform glow, just like when looking at a black image in the gallery or browser
It's actually more noticeable if you look AWAY. The peripheral area of your retina will be able to pick up a very feeble amount of light. Feeble, sure, but it's there nonetheless.
seriously, guys?
XQC said:
seriously, guys?
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The problem is that the way it is supposed to work is that if you display black, the screen shouldn't use any energy at all but it is and people can see it and so is using precious battery charge.
The issue is... that apps like noled which were going to display a red dot on the screen to let people know if they had mail waiting or whatever wouldnt use much power at all because they were displaying mainly a black screen but it isnt actually black and still using light so still chews through the power..
hope that made sense.. but that is why people are interested in it..
Ok, I missed the battery part, sorry If so, it is indeed an annoyance...
I thought people were seriously complaining about image quality.
I have the Samsung wave and it uses the same screen technology and I can tell that it does not have true blacks pixels are still lit, I can easily tell that its on and totally off there is a very faint trace amount of light produced..
Since I first got this device and turned it on I have been impressed with the display. I am kind of partial to AMOLED diplays and am, thus, a bit biased. What surprised me was that it "appeared" sharper than the display on the Nexus One. Considering it is slightly larger and at the same resolution I just assumed that it wasn't using the PenTile arrangement - yet it appears that it does in fact use the same subpixel arrangement as the screen on the Nexus One. My point is... now I've forgotten my point. Basically that I am more than satisfied with this display.
As far as the black issue is concerned I have no idea. There must be some reason considering that was one of the supposed strengths of this technology (i.e. true blacks and lower power consumption).
El Mono
wait so why would you display an image if you want to save battery?
really
How many of you have measured how much power is being used up when the display is displaying a true black image(measured with multimeter, or other measuring device)
How many of you have made sure that the glow is not caused by a residual charge in the display?
How many of you know how much time it takes for the "glow" to leave an OLED panel when power is not being applied?
just some food for thought
The thing is, amoled screens were advertised as having true blacks and having the pixels off when displaying black. this is clearly not the case
It's not an issue with the technology. The screen doesn't have a back lighting panel, so i think it's more of a problem of what shade is default defined as "black" in the system, or something with any current running through the screen.
Well considering the screen doesn't turn off when displaying a 100% black bitmap image, its safe to say that the say that the pixels NEVER turn themselves off during use when displaying black
Could be the screen isn't calibrated properly, or they lied to us about the tech(wouldn't be the first time).
While its not "true black" it is defenently beyond what any backlit screentype can do regarding blacks.
Except perhaps for the retina display forged by god himself
But I agree that if Samsung states True black then it should be able to do that.
Sent from my GT-I9000 using XDA App
sure everyone loves the super super-amoled display of our sgs's.
but even in casual usage- not looking under microscope,
i can make out the dots making up every font. small fonts look bad.
and in landscape its even more noticeable.
in the android running on my topaz , i cant make out the dots.
so is it the bigger screen, with poor dpi or an issue specific to amoled?
is dithering off , if so any way to turn it on?
or is it just me/ should i get my eyes etc tested?
4-inches of nexus 1 res = that.
afaik the black dots are a physical limitation so you can't really software fix that
personally i don't have a problem with it, they're noticeable only on very small fonts (its ok on "only pretty damn small" haha)
Unfortunately text is not the Galaxy S' screen's strong point, because it uses a PenTile layout - rather than having red, green and blue (RGB) subpixels to make up each pixel, it has an alternating pattern of RG and BG subpixels, using interpolation to provide proper colours over the full screen resolution. However, while this is fine for graphics, it's not as crisp for text. I was concerned about this before getting the phone; it's livable with though, as I usually hold the phone just far enough away that I don't notice.
There's nothing that can be done about it, because it's hardware, and it's a tradeoff for having the Super AMOLED screen. The Nexus One and Desire, which have (until recently, anyway) AMOLED screens, also use a PenTile matrix.
Mithent said:
Unfortunately text is not the Galaxy S' screen's strong point, because it uses a PenTile layout - rather than having red, green and blue (RGB) subpixels to make up each pixel, it has an alternating pattern of RG and BG subpixels, using interpolation to provide proper colours over the full screen resolution. However, while this is fine for graphics, it's not as crisp for text. I was concerned about this before getting the phone; it's livable with though, as I usually hold the phone just far enough away that I don't notice.
There's nothing that can be done about it, because it's hardware, and it's a tradeoff for having the Super AMOLED screen. The Nexus One and Desire, which have (until recently, anyway) AMOLED screens, also use a PenTile matrix.
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Thanks that was very informative.
After a year of usage, through using the antutu test app for LCD I noticed that the pixels on top edge of the screen are brighter than the rest. It's probably because of the black notification bar.
Can other users with super amoled NS check this and see how their panel holded up? The best way to check it is with a plain gray or blue image.
Thanks
neXus S i9020T - AOSP+ - SG Kernel - 100/1320 MHz
I've the i9023 myself, but current (possibly future, too) OLED panels degrade unevenly. Whites and blues use the most power and lower the brightness after prolonged use more so than reds and blacks (with blacks effectively turning off the pixels and draining little to no power and don't effect brightness).
These kinds of effects are likely going to be more prevalent now that some years have passed since the first OLED displays have appeared. For comparison, LCDs use a backlight behind the screen which uses the same amount of power between white and black, though blacks look a little grey. As a result, there is even brightness fade.
For those unaware of it, on AMOLED displays, a black wallpaper will provide a boost to battery life because black pixels on AMOLED screens don't consume any power, because they aren't powered at all in the first place.
My question is, does this work with the display on the Nexus 7 even though it's a different type?
krion64 said:
For those unaware of it, on AMOLED displays, a black wallpaper will provide a boost to battery life because black pixels on AMOLED screens don't consume any power, because they aren't powered at all in the first place.
My question is, does this work with the display on the Nexus 7 even though it's a different type?
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I'm guessing it doesn't since its LCD technology, meaning ALL pixels on the display are powered and therefore draw power, no matter what color is present on the pixels. Black may draw less power than usual but it won't be as good as the AMOLED screens. The biggest power saver on LCD-screens is the brightness is my guess.
Please correct me if I'm wrong.
It doesn't save any power if the screen is colored black (besides it being off). The only way to save power on the n7 is to decrease the screen back light.
I actually have some pixels burned in at the top of the phone, kind of where the black bars would be if you play a video at original 16:9 format.
I haven't checked my navbar button are yet.
I'm dissappointed, I've had the Galaxy S4, S5, S6, and S7 and none of those displays got burn-ins for me.
Can you take a photo of it with another camera?
Hi everyone,
I would like to know if you have the same "problem ". I've received a galaxy s8 last Friday. Everything was great except one. I've a noticed a potential image retention. For example, the (black) navbar remained on the screen for 3-5 second after closing an app. Or the black bar on the top (when apps aren't full screen) was noticeable also after closing. So I went to a store to see their galaxy s8 and s8+ and test it. The results was clear, their galaxy s8 had the same "problem" but not the s8+. So I decided to change my phone and get a new. Surprise, same thing... then I went to another store and their s8 also had this potential issue but not their s8+. So I've seen 4 galaxy s8 having this problem. My question is simple. Am I the only one ? Will it get worse ? Is it normal ? I don't think that my store is going to change my phone again. Keep in mind that this "image retention" is more noticeable on a blue or gray picture. Thanks for your answers.
Wait i thought black pixels would be turned off when watching with black bars so that wouldnt cause a burn in or does it?
lvinwithandroid said:
Wait i thought black pixels would be turned off when watching with black bars so that wouldnt cause a burn in or does it?
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Correct, black is turned off, but with black background, light coloured icons are on, and quickly burn in compared to those around it.
But this seems ridiculously quick.
oled burn-in is actually caused by pixels being turned off, but shouldn't be visible this quickly.
it's caused by active pixels being "used up" quicker than inactive pixels.
but are you sure there's actual burn in?
the navigation and notification bars aren't completely transparent, they'll always show a faint black background that looks a bit like a shadow.
and on oled screens that completely disable "black" pixels often have a slight delay when switching between black and colored.
Yes and it's not that bad. I just know that I had this problem on my s6 edge after 6 months. So if I have it after one week with my s8, how will be the screen after 6 months ? I'm just worry about permanent burn in...
thedicemaster said:
oled burn-in is actually caused by pixels being turned off, but shouldn't be visible this quickly.
it's caused by active pixels being "used up" quicker than inactive pixels.
but are you sure there's actual burn in?
the navigation and notification bars aren't completely transparent, they'll always show a faint black background that looks a bit like a shadow.
and on oled screens that completely disable "black" pixels often have a slight delay when switching between black and colored.
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so this means using black wallpaper is not recommended ?
hamdir said:
so this means using black wallpaper is not recommended ?
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Either defective screens or s8 screen in general is a joke. My s7e doesn't have any visible burn-out(yep, that's how it's called in amoled screens, it's decaying light output of the individual pixels compared to the those around them) after 8m heavy use.
Did anyone see this? http://phandroid.com/2017/05/02/galaxy-s8-screen-burn-in-fix/
high_voltage said:
Either defective screens or s8 screen in general is a joke. My s7e doesn't have any visible burn-out(yep, that's how it's called in amoled screens, it's decaying light output of the individual pixels compared to the those around them) after 8m heavy use.
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So you had the same problem like us but it didn't get worse ?
Enzo1707 said:
So you had the same problem like us but it didn't get worse ?
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No, I don't have any kind of a problem with the display and I hope it will stay that way. I am just saying I never tried to search for it hense no visible burn-out. All I care is for a real usage problem, not forced search for it.